WO2005091258A1 - Structures with variable dimensions for a flexible led display - Google Patents

Structures with variable dimensions for a flexible led display Download PDF

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Publication number
WO2005091258A1
WO2005091258A1 PCT/FR2004/000398 FR2004000398W WO2005091258A1 WO 2005091258 A1 WO2005091258 A1 WO 2005091258A1 FR 2004000398 W FR2004000398 W FR 2004000398W WO 2005091258 A1 WO2005091258 A1 WO 2005091258A1
Authority
WO
WIPO (PCT)
Prior art keywords
flexible
light sources
flexible display
strips
display according
Prior art date
Application number
PCT/FR2004/000398
Other languages
French (fr)
Inventor
Emmanuel Deflin
Emeric Mourot
Michel Remy
Original Assignee
France Telecom
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by France Telecom filed Critical France Telecom
Priority to DE602004008345T priority Critical patent/DE602004008345T2/en
Priority to PCT/FR2004/000398 priority patent/WO2005091258A1/en
Priority to AT04713097T priority patent/ATE370492T1/en
Priority to EP04713097A priority patent/EP1716553B1/en
Publication of WO2005091258A1 publication Critical patent/WO2005091258A1/en

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F21/00—Mobile visual advertising
    • G09F21/02—Mobile visual advertising by a carrier person or animal
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
    • G09F9/3026—Video wall, i.e. stackable semiconductor matrix display modules

Definitions

  • the present invention relates to the field of flexible displays and more particularly flexible displays that can be integrated into textile supports, for example clothing. This is called “foldable" displays.
  • the applications relate, among other things, to the advertising, security, signage, decoration, leisure and even events-related sectors. They relate in particular to the dissemination of visual information on a person's clothing, and allow this information to be perceived by people located in the immediate vicinity of the display.
  • Current flexible display technologies have major drawbacks, which prevent their integration into textile supports. These drawbacks are, for example, too great a rigidity of the display, dimensions, and rigidity characteristics due to the integration of “hardware” electronic systems in textiles.
  • An object of the present invention is to provide a flexible display which is less affected by the above limitations, and in particular to optimize the flexibility and the deformable appearance of the display, and to propose technical solutions allowing several possible configurations. screen.
  • the invention provides a flexible display comprising: - a display matrix comprising discrete light sources fixed spacedly on the matrix and distributed over at least two substantially parallel flexible strips included in the matrix and, electrical conductors for each of the flexible strips connecting the discrete light sources of the same flexible strip in series, the parallel flexible strips being separated by slots, - control and power supply units for discrete light sources, and - a flexible circuit comprising conductive tracks connecting the control and power supply units to the electrical conductors of each strip.
  • a display according to the invention has high flexibility or wrinkle characteristics, since it is designed from parallel flexible strips separated by slots enhancing the overall flexibility of the display.
  • the electrical control and supply units comprise means for addressing discrete light sources in series, via the conductive tracks of the flexible circuit and the electrical conductors of each flexible strip. At least one control unit may for example be arranged in a corner of the flexible display thus produced.
  • each flexible strip comprises a plurality of substantially parallel electrical wires or tracks and the discrete light sources comprise at least two control and supply electrodes welded to each of the electrical wires or tracks.
  • the parallel flexible strips consist of a flexible polymer film of the polyimide or PVC type. It is for example made of the material known under the brand "Kapton".
  • each flexible strip can then include tracks or electrically conductive wires onto which the discrete light sources are welded.
  • each flexible strip consists of a fabric and has woven threads including electrically conductive threads used to transmit the control and power signals.
  • the discrete light sources can then be soldered onto the conductor wires.
  • Such a flexible strip of fabric can therefore be produced using tools known in the textile field.
  • Each flexible strip thus makes it possible to route a control and supply signal from the control and supply units to the electroluminescent sources.
  • the discrete light sources comprise light-emitting diodes (LED or "Light Emitting Diode").
  • the invention provides a textile structure comprising a display according to the invention.
  • FIG. 1 represents a flexible strip 1 intended for a flexible display according to the invention, comprising a flexible support 2 and electrical conductors 3 and 4.
  • the flexible support 2 can be a flexible polymer film of the polyimide or PVC type, it is for example made of the material known under the brand "Kapton".
  • the electrical conductors 3 and 4 can be conductive metal tracks produced on the flexible support 2, for example by deposition then selective etching.
  • Electrical conductors can also be wires conductors contained in the flexible support 2. They can be made of copper, tinned copper, silver copper, or golden copper, and be sheathed with a polymer resin (for example polyester) which electrically insulates them from each other.
  • a polymer resin for example polyester
  • the flexible support 2 is produced from woven threads.
  • these threads are electrically conductive threads 3 and 4 woven in a mixture with other textile threads.
  • the support 2 is woven for example according to a weave of the canvas type, with a sufficiently loose mesh (openwork) to be able to leave the conductive wires visible by segments.
  • the wires used have a sufficiently high titration (or fineness) to give the fabric a good surface condition, sufficient to be able to serve as a support for the soldering using soldering tools on conventional printed circuits (roughness less than 0.15 mm) .
  • the textile threads are, for example, electrically insulating and resistant to physical constraints, in particular from temperatures imposed by welding.
  • the flexible strip of FIG. 1 can be produced continuously so as to have a very long strip, which will be cut into a shorter strip according to the needs and the size of the flexible display that it is desired to constitute. It can also, in the case of the flexible strip of polymer film, be produced directly on a flexible circuit which may in this case comprise several parallel flexible strips as explained below in one of the embodiments according to the invention. In the rest of the description, the embodiments presented will interchangeably, unless otherwise specified, the flexible strips of polymer film or woven. In the example of FIG. 1, there are four conductive tracks or wires.
  • Discrete light sources 10 are spaced apart on the flexible support 2 and connected to these tracks or conductive wires 3 and 4.
  • the light sources 10 are electronic modules directly addressable in series comprising for example an LED of the CMS type ("Component Surface Mounted "), a shift register and an amplifier. These modules are called LED modules below.
  • Each LED module 10 includes two power supply electrodes 11 and several data electrodes 12 (or control electrodes), for example two, to define the intensity value to be given to each LED.
  • the conductive tracks or wires 3 are intended for supplying the LED modules and connected to the supply electrodes 11
  • the conductive tracks or wires 4 are intended for supplying the control signal of the LED modules and are connected to the control electrodes 12.
  • the electrodes of the LED modules are soldered on the tracks or conductive wires 3 and 4.
  • the soldering must be short enough not to degrade the flexible support 2.
  • the welds of the electrodes 11, 12 on the conductive wires 3 and 4 are made in a very short period of time and at a temperature sufficient to be able to very quickly rid the electrical wires of their insulating protection, which melts in the heat, and solder these wires, without, however, damaging the rest of the flexible strip.
  • the flexible displays of the present invention are therefore formed from these flexible strips arranged in parallel.
  • the LED modules can be soldered directly onto the flexible strips before the display is built up, or else welded later, once the strips are in place to form the display. FIG.
  • FIG. 2 represents a first embodiment of a flexible display 50 according to the invention.
  • four flexible bands 30 are used.
  • Each flexible strip 30 comprises four LED modules 40 each forming a pixel.
  • the whole forms a screen or display matrix.
  • the flexible display shown therefore includes a screen or display matrix of 4x4 pixels.
  • the flexible strips are cut to the desired length for the flexible display, then positioned in parallel and then welded one by one to a peripheral flexible circuit 60.
  • the flexible circuit 60 is a support of the flexible polymer film type (polyimide or PVC, for example ), also commonly called flexible circuit or "flex". It includes tracks 22 connecting one or more control and supply units 20 to the flexible strips 30, via the solder points 21.
  • the flexible circuit 60 preferably has an upper surface on the screen so as to be able to place the tracks 22 and the control and supply units 20 around the periphery of the flexible circuit 60, and therefore on the periphery of the screen.
  • the control and supply units 20 of the LED modules 40 are in the form of two control boxes 20 controlling and supplying several tracks 22, in this case four in number (two and two data). This set of four tracks 22 relays the four signals corresponding to the different tracks or conductive wires 31 of the flexible strips 30 via the different solder points 21.
  • the LED modules are controlled in series by the control boxes 20. Each flexible strip 30 is retained via the solder points 21 on the flexible circuit 60.
  • FIG. 1 illustrates a second embodiment of the display according to the invention. Only the main differences between the embodiments of Figures 2 and 3 will be detailed below. In the figures, identical references designate similar elements.
  • the screen can be produced in one piece independently of the flexible circuit 60.
  • the flexible strips 30 are produced continuously so as to be integral with each other. For example, the number of pixels required in the direction Y of FIG. 3 is determined, which corresponds to as many flexible strips 30, and they are then manufactured in the direction X continuously, as in the case of the exposed single flexible strip. earlier.
  • the strips thus produced share the same support which is then cut according to the length necessary for the screen in the direction X.
  • the screen thus produced is then welded on the flexible circuit at the solder points 21 in order to connect the modules LED 40 to the control and supply units 20 via the conductive tracks 22.
  • the flexible display thus produced is perforated at the level of the slots 66 in FIG. 3 in order to increase the flexibility of the display thus obtained.
  • the slits can be more or less long, until reaching the length of the flexible strips (direction X).
  • the cohesion of the assembly can be reinforced by gluing the rear surface of the screen to the flexible circuit 60.
  • This embodiment has less mechanical complexity and better consistency than the first embodiment of FIG. 2.
  • the strips are directly formed on the flexible circuit 60, rather than being produced from flexible woven strips or made of polymer film distinct from the flexible circuit 60.
  • the conductive tracks 22 and 31 are produced for example by deposition and then selective etching directly on the flexible circuit 60.
  • the solder points 21 are then no longer necessary.
  • the slots 66 are perforated directly on the flexible circuit 60.
  • FIG. 3 The pixel density of the flexible display or of the matrix according to the two embodiments illustrated in FIG. 3 is identical to that of the first embodiment of FIG. 2.
  • Figure 4 shows another embodiment according to the invention. Only the main differences with the embodiments will be detailed below.
  • identical references designate similar elements.
  • the parallel flexible bands 30 extend in a weft direction (in the X direction of Figure 4) and additional flexible bands 35 are woven on the flexible bands 30 in a warp direction (Y direction of Figure 4) perpendicular to the weft direction of the flexible strips 30, so as to present an alternating pattern (according to the “1 in 2” principle).
  • Each section of flexible strip not covered includes an LED module 40. Behind each LED module or pixel of a given strip, there is a flexible strip section devoid of LED module.
  • the density of the screen thus obtained is equal to that of the other embodiments, the density per flexible strip is twice less.
  • This embodiment requires an additional step of weaving the screen, by hand or with a suitable machine.
  • the screen is then welded to the flexible circuit 60 via the solder points 21 in order to connect the tracks 22 to the control and supply units 20.
  • the number of control units and power supply 20 is four, and the flexible circuit 60 requires twice as many conductive tracks 22 as for the previous embodiments.
  • the screen can be glued to the flexible circuit 60 to reinforce the mechanical coherence of the flexible display 50.
  • FIG. 5 presents a display 122 according to the invention, comprising for example a display 101 of a type similar to the display shown in FIGS. 2 to 4, comprising a screen or display matrix 102.
  • a matrix of 7 ⁇ 5 LED modules 106 spaced apart from each other is welded onto conductive tracks or wires transmitting the control and supply signals of the LED modules from at least one control and supply unit.
  • the latter as well as the conductive tracks or wires are not shown in FIG. 5.
  • the display 122 also comprises a diffusing element 123 covering the LED modules 106 so as to diffuse the light coming from two LEDs adjacent to produce a substantially continuous light display on a face 123a of the diffusing element 123 opposite the LEDs.
  • the display 101 and the diffusing element 123 are shown in a manner which is not completely superimposed for the sole purpose of being able to highlight the contribution of each of the components taken individually. This diffusing element 123 increases the visibility of each LED by multiplying its emission surface beyond the emission surface of the LED.
  • the flexible display 122 further comprises a non-diffusing covering element 124 (shown in a non-superimposed manner as for the diffusing element 123) to provide a specific covering for the display 122, by means of textile materials. , of different colors and weaving or knitting patterns, which thus facilitates integration into a textile support.
  • This covering element 124 also brings new physical properties to the display 101, for example sealing or impact resistance.
  • the diffusing element 123 could itself integrate the characteristics presented here by the covering element 124.
  • the diffusing element 123 is flexible and can be a foam, a fabric or a mesh structure.
  • the diffusing element 123 and the covering element 124 are for example assembled by laminating.
  • FIG. 6 is a cross section of the display of FIG. 5, at the level of the last line at the bottom of the display 122.
  • the diffusing element 123 shown in FIG. 6 can be made of a foam type material.
  • the covering element 124 allows the covering element 124 to be positioned at the desired distance from the LEDs 106.
  • the surface of the light spot or pixel visible from the display 122 according to the invention considered, will therefore depend on the angle of the emission cone ⁇ an LED 106, the thickness d of the diffusing element 123, as well as the spacing e between the LEDs 106.
  • the LEDs 106 are also embedded in a flexible resin 128, which allows the display 101 to resist the mechanical stresses linked to bending. There are many other possible embodiments of the display 122 according to the invention, depending in particular on the type of diffusing element 123 chosen.
  • the light emitted by the LEDs 106 can be diffused and diffracted inside a diffusing element made up of transparent encapsulating cells, before being projected onto the covering element 124.
  • a diffusing element made up of transparent encapsulating cells, before being projected onto the covering element 124.
  • These cells may advantageously not be integral with each other, and the cover element 124 not be integral with the cells, which guarantees maximum flexibility on the display.
  • the light emitted by the LEDs is diffused directly in a diffusing element further ensuring the functions of covering element made of a material having specific characteristics of light conduction, either by the nature of the material used (polyester, polyamide, etc.), or by - or in combination with - its use (fabric, mesh structure, non-woven fabric, foam, etc.).
  • One of the main advantages of a display according to the invention is to be able to adapt the elements constituting it according to the desired effect or in particular the constraints of flexibility imposed. Indeed, depending on the choice in particular of the diffusing element, it is possible to generate on the surface of the display 122 more or less large pixels, and therefore use more or less light sources, with equal image definition. We can thus adapt the flexibility of the display, which depends in particular on the number of light sources, according to the desired flexibility.
  • the fabric support lined with light sources, a diffusing element and possibly a covering element can be assembled by gluing. In another embodiment, the flexible support and the diffusing element can be glued, the covering element being simply placed on the diffusing element, in order to allow the sliding of one over the other.
  • the diffusing element and the covering element can be assembled by gluing or sewing, then can be placed on the support furnished with light sources with, in this case also, a possibility of sliding.
  • This assembly must guarantee perfect contact between the various components of the display: support fitted with light sources, diffusing element and covering element to be able to ensure a size as well as a uniform visibility of the pixels on the screen surface.
  • Another aspect of the invention relates to a textile structure comprising a display according to the first aspect of the invention.
  • the display can be assembled, definitively or not, to the rest of the textile structure in different ways; using conventional donrdashery systems such as zippers, flexible Velcro straps, press studs or even sewing.
  • the display or some of the elements constituting it can also be inserted into a suitable pocket through an opening.
  • This pocket can have a simple holding function with transparency, or also include, as detailed below, a diffusing element and / or a covering element.
  • This pocket can in particular allow the display to be removed from the textile structure.
  • a diffusing element and / or a covering element can be made in the textile structure itself. They can, for example be part of a holding pocket, as mentioned above and as shown in Figure 7.
  • a shirt 125 has a pocket 126.
  • An upper part 127 of pocket 126 consists of a diffusing element and a covering element, for example sewn together, the covering element being arranged so as to cover the face of the diffusing element opposite to the LEDs, once the display inserted in the pocket as indicated below.
  • the periphery of this upper part is sewn, with the exception of one of the sides, on the rest of the textile structure, thus delimiting, on the rest of the textile structure, a lower part of the pocket, and a housing between the lower part and the upper part making it possible to accommodate a display 101 there, for example like the display described in FIGS. 2 to 4.
  • This support can be inserted by sliding into the pocket 126 as shown in FIG. pocket is provided with a closure system 31, for example a zipper 31.
  • the cover element on the upper part 127 can be adapted so as not to have any visible demarcation with respect to the rest of the surface of the shirt 125 when the display is off.
  • the different assembly possibilities between the fabric support furnished with LEDs, a diffusing element and a covering element presented in the case of the display according to the invention are of course applicable in the case of the textile structure according to the invention .
  • a display according to the invention has many advantages, in particular in terms of flexibility thanks to the relative freedom which is available in the number of light sources to be used, in terms of display quality due to pixelation made continuous by the use of 'a diffusing element, size, weight and simplicity of implementation. It allows the creation of a communicating textile structure, guaranteeing both quality display and wearing comfort.

Abstract

The invention relates to a flexible display (50) comprising a display array provided with discrete light sources (10, 40) that are fixed in such a way that they are interspaced on the array and distributed between at least two essentially parallel flexible strips (1, 30) included in the array; electrical conductors (3, 4, 31) which are provided for each of the flexible strips in order to connect the discrete light sources of the same flexible strip in series, the parallel flexible strips being separated by gaps (65, 66, 67); units for controlling and supplying (20) the discrete light sources (10, 40); and a flexible circuit (60) comprising strip conductors (22) for connecting the control and supply units to the electrical conductors of each strip.

Description

STRUCTURES A DIMENSIONS VARIABLES POUR AFFICHEUR SOUPLE A LEDVARIABLE DIMENSIONAL STRUCTURES FOR FLEXIBLE LED DISPLAYS
La présente invention concerne le domaine des afficheurs souples et plus particulièrement les afficheurs souples intégrables dans des supports textiles, par exemple vestimentaires. On parle alors d'afficheurs "pliables". Les applications concernent entre autres les secteurs de la publicité, de la sécurité, de la signaletique, de la décoration, des loisirs ou encore des manifestations à caractère événementiel. Elles portent notamment sur la diffusion d'informations visuelles sur les vêtements d'une personne, et permettent que ces informations soient perçues par les personnes situées dans un voisinage immédiat de l'afficheur. Les technologies actuelles d'afficheurs souples présentent de gros inconvénients, qui empêchent leur intégration dans les supports textiles. Ces inconvénients sont par exemple une rigidité trop importante de l'afficheur, des caractéristiques d'encombrement, de rigidité due à l'intégration de systèmes électroniques « hardware » dans du textile. La consommation électrique requise, le poids et l'impossibilité de personnaliser l'esthétique de l'écran en fonction du support textile cible peuvent également être incompatibles avec le type d'application souhaitée. La réalisation peut être également difficile et donc coûteuse. Un but de la présente invention est de proposer un afficheur souple qui soit moins affecté par les limitations ci-dessus, et notamment d'optimiser la souplesse et l'aspect déformable de l'afficheur, et de proposer des solutions techniques permettant plusieurs configurations possibles d'écran. Ainsi suivant un premier aspect, l'invention propose un afficheur souple comportant : - une matrice d'affichage comportant des sources lumineuses discrètes fixées de façon espacée sur la matrice et réparties sur au moins deux bandes souples sensiblement parallèles incluses dans la matrice et, des conducteurs électriques pour chacune des bandes souples reliant les sources lumineuses discrètes d'une même bande souple en série, les bandes souples parallèles étant séparées par des fentes, - des unités de commande et d'alimentation des sources lumineuses discrètes, et - un circuit souple comportant des pistes conductrices reliant les unités de commandes et d'alimentation aux conducteurs électriques de chaque bande. Un afficheur selon l'invention présente des caractéristiques de souplesse ou de froissabilité élevées, puisqu'il est conçu à partir de bandes souples parallèles séparées par des fentes renforçant la souplesse globale de l'afficheur. L'utilisation de plusieurs bandes permet par ailleurs une longueur de bande souple plus adaptée à la taille de la matrice et de limiter les déperditions de signal de commande et d'alimentation. Avantageusement, les unités de commande et d'alimentation électriques comprennent des moyens d'adressage en série des sources lumineuses discrètes, via les pistes conductrices du circuit souple et les conducteurs électriques de chaque bande souple. Au moins une unité de commande pourra être par exemple disposée dans un angle de l'afficheur souple ainsi réalisé. Dans un mode de réalisation préféré, chaque bande souple comporte une pluralité de fils ou de pistes électriques sensiblement parallèles et les sources lumineuses discrètes comportent au moins deux électrodes de commande et d'alimentation soudées à chacun des fils ou pistes électriques. Dans un autre mode de réalisation préféré, les bandes souples parallèles sont constituées d'un film polymère souple du type polyimide ou PVC. Il est par exemple réalisé en le matériau connu sous la marque "Kapton". Chaque bande souple peut alors comporter des pistes ou des fils électriquement conducteurs sur lesquelles sont soudées les sources lumineuses discrètes. Dans un autre mode de réalisation préféré, chaque bande souple est constituée d'un tissu et comporte des fils tissés incluant des fils électriquement conducteurs servant à transmettre les signaux de commande et d'alimentation. Les sources lumineuses discrètes peuvent être alors soudées sur les fils conducteurs. Une telle bande souple de tissu peut donc être réalisée à l'aide d'outils connus dans le domaine du textile. Chaque bande souple permet ainsi d'acheminer un signal de commande et d'alimentation depuis les unités de commande et d'alimentation jusqu'aux sources électroluminescentes. Avantageusement, les sources lumineuses discrètes comprennent des diodes électroluminescentes (LED ou "Light Emitting Diode"). Suivant un deuxième aspect, l'invention propose une structure textile comportant un afficheur selon l'invention. De par la nature de l'afficheur, l'intégration de ce dernier dans la structure textile peut se faire à l'aide d'outils d'intégration textile classique (couture, thermosoudure...). D'autres caractéristiques et avantages de l'invention apparaîtront encore à la lecture de la description qui va suivre. Celle-ci est purement illustrative et doit être lue en regard des dessins annexés sur lesquels : - la figure 1 présente une bande souple destinée à un afficheur souple selon l'invention ; - la figure 2 présente un afficheur souple selon l'invention dans un premier mode de réalisation ; - la figure 3 présente un afficheur souple selon l'invention dans un second mode de réalisation ; - la figure 4 présente un afficheur souple selon l'invention dans un troisième mode de réalisation ; - la figure 5 présente un afficheur selon l'invention comportant un élément diffusant et un élément de couverture ; - la figure 6 est une coupe transversale de l'afficheur de la figure 6 ; - la figure 7 représente une structure textile selon l'invention. La figure 1 représente une bande souple 1 destinée à un afficheur souple selon l'invention, comportant un support souple 2 et des conducteurs électriques 3 et 4. Dans un premier mode de réalisation de la bande souple 1 , le support souple 2 peut être un film polymère souple du type polyimide ou PVC, il est par exemple réalisé en le matériau connu sous la marque "Kapton". Dans ce cas, les conducteurs électriques 3 et 4 peuvent être des pistes métalliques conductrices réalisées sur le support souple 2, par exemple par dépôt puis gravure sélective. Les conducteurs électriques peuvent également être des fils conducteurs contenus dans le support souple 2. Ils peuvent être en cuivre, en cuivre étamé, en cuivre argenté, ou en cuivre doré, et être gainés par une résine polymère (par exemple polyester) qui les isole électriquement entre eux. Dans un deuxième mode de réalisation de la bande souple 1 , le support souple 2 est réalisée à partir de fils tissés. Parmi ces fils figurent des fils électriquement conducteurs 3 et 4 tissés en mélange avec d'autres fils textiles. Le support 2 est tissé par exemple selon une armure de type toile, avec un maillage suffisamment lâche (ajouré) pour pouvoir laisser apparents par segments les fils conducteurs. Les fils employés ont un titrage (ou une finesse) suffisamment élevé pour conférer au tissu un bon état de surface, suffisant pour pouvoir servir de support à la soudure en utilisant des outils de soudure sur circuits imprimés classiques (rugosité inférieure à 0,15mm). Les fils textiles sont par exemple isolants sur le plan électrique et résistant aux contraintes physiques, notamment de températures imposées par la soudure. Ils sont par exemple en coton, polyester ou polyamide. Les fils conducteurs 3 et 4 sont de même nature que ceux décrits précédemment. La bande souple de la figure 1 peut être réalisé en continu de manière à disposer d'une bande de grande longueur, qui sera découpée en bande plus courte selon les besoins et la taille de l'afficheur souple que l'on désire constituer. Elle peut aussi, dans le cas de la bande souple en film polymère être réalisée directement sur un circuit souple qui peut comprendre dans ce cas plusieurs bandes souples parallèles comme expliqué par la suite dans l'un des modes de réalisation selon l'invention. Dans la suite de l'exposé, les modes de réalisation présentés comporteront indifféremment, sauf précision contraire, les bandes souples en film polymère ou tissées. Dans l'exemple de la figure 1 , les pistes ou fils conducteurs sont au nombre de quatre. Des sources lumineuses discrètes 10 sont réparties de façon espacée sur le support souple 2 et connectées à ces pistes ou fils conducteurs 3 et 4. Les sources lumineuses 10 sont des modules électroniques directement adressables en série comportant par exemple une LED de type CMS ("Composant Monté en Surface"), un registre à décalage et un amplificateur. Ces modules sont nommés modules LED ci-après. Chaque module LED 10 comporte deux électrodes 11 d'alimentation en énergie et plusieurs électrodes 12 de données (ou électrodes de commande), par exemple deux, pour définir la valeur d'intensité à conférer à chaque LED. Dans l'exemple de la figure 1 , les pistes ou fils conducteurs 3 sont destinés à l'alimentation des modules LED et connectés aux électrodes d'alimentation 11 , les pistes ou fils conducteurs 4 sont destinés à l'acheminement du signal de commande des modules LED et sont connectés aux électrodes de commande 12. Les électrodes des modules LED sont soudées sur les pistes ou fils conducteurs 3 et 4. La soudure doit être suffisamment courte pour ne pas dégrader le support souple 2. Par exemple, dans le cas de l'utilisation de fils électriques, les soudures des électrodes 11 , 12 sur les fils conducteurs 3 et 4 sont faites dans un laps de temps très court et à une température suffisante pour pouvoir très rapidement débarrasser les fils électriques de leur protection isolante, qui fond sous la chaleur, et souder ces fils, sans toutefois détériorer le reste de la bande souple. Les afficheurs souples de la présente invention sont donc constitués à partir de ces bandes souples disposées parallèlement. Les modules LED peuvent être soudés directement sur les bandes souples avant constitution de l'afficheur, ou bien soudées ultérieurement, une fois les bandes en place pour former l'afficheur. La figure 2 représente un premier mode de réalisation d'un afficheur souple 50 selon l'invention. Dans cet exemple, quatre bandes souples 30 sont utilisées. Chaque bande souple 30 comporte quatre modules LED 40 formant chacun un pixel. L'ensemble forme un écran ou matrice d'affichage. L'afficheur souple représenté comprend donc un écran ou matrice d'affichage de 4x4 pixels. Les bandes souples sont découpées selon la longueur souhaitée pour l'afficheur souple, puis positionnées parallèlement et ensuite soudées une à une à un circuit souple périphérique 60. Le circuit souple 60 est un support du type film polymère souple (polyimide ou PVC, par exemple), appelé encore couramment circuit flexible ou « flex ». Il comprend des pistes 22 reliant un ou plusieurs unités de commande et d'alimentation 20 aux bandes souples 30, via les points de soudure 21. Le circuit souple 60 présente préférablement une surface supérieure à l'écran de manière à pouvoir placer les pistes 22 et les unités de commandes et d'alimentation 20 sur le pourtour du circuit souple 60, et donc en périphérie de l'écran. Dans l'exemple de la figure 2, les unités de commande et d'alimentation 20 des modules LED 40 se présentent sous la forme de deux boîtiers de commande 20 commandant et alimentant plusieurs pistes 22, dans le cas présent au nombre de quatre (deux d'alimentation et deux de données). Cet ensemble de quatre pistes 22 relaye les quatre signaux correspondants aux différentes pistes ou fils conducteurs 31 des bandes souples 30 via les différents points de soudure 21. Les modules LED sont pilotés en série par les boîtiers de commande 20. Chaque bande souple 30 est retenue via les points de soudure 21 sur le circuit souple 60. Elles sont séparées entre elles par des espaces libres ou fentes 65 à travers lesquelles on peut apercevoir le circuit souple 60 sur toute la longueur des bandes. Ceci permet un gain en souplesse de l'afficheur souple 50. Ces mêmes fentes peuvent également être découpées sur le circuit souple 60 au regard de chaque fente 65. Par ailleurs, en plus des points de soudure 21 , les bandes peuvent également être collées sur le circuit souple 60 pour renforcer la cohésion de l'écran. La densité de pixel de l'afficheur souple ou de la matrice selon ce mode de réalisation, c'est-à-dire le nombre de modules LED ou pixels par unité de surface, est le même que celui de chaque bande souple 30. La figure 3 illustre un deuxième mode de réalisation de l'afficheur selon l'invention. Seules les principales différences entre les modes de réalisation de les figures 2 et 3 vont être détaillées ci-dessous. Sur les figures, des références identiques désignent des éléments similaires. L'écran peut être réalisé d'un seul tenant indépendamment du circuit souple 60. Les bandes souples 30 sont produites en continu de manière à être solidaires les unes des autres. On détermine par exemple le nombre de pixels nécessaires dans la direction Y de la figure 3, ce qui correspond à autant de bandes souples 30, et elles sont fabriquées alors dans la direction X en continu, comme pour le cas de la bande souple simple exposé plus tôt. Les bandes ainsi produites partagent un même support qui est ensuite découpé en fonction de la longueur nécessaire pour l'écran dans la direction X. L'écran ainsi réalisé est ensuite soudé sur le circuit souple au niveau des points de soudure 21 afin de relier les modules LED 40 aux unités de commande et d'alimentation 20 via les pistes conductrices 22. L'afficheur souple ainsi réalisé est ajouré au niveau des fentes 66 de la figure 3 afin d'augmenter la souplesse de l'afficheur ainsi obtenu. Les fentes peuvent être plus ou moins longues, jusqu'à atteindre la longueur des bandes souples (direction X). La cohésion de l'ensemble peut être renforcée en collant la surface arrière de l'écran sur le circuit souple 60. Ce mode de réalisation présente une complexité mécanique moindre et une meilleure cohérence que le premier mode de réalisation de la figure 2. Dans un autre de mode de réalisation selon l'invention, également illustré par la figure 3, les bandes sont directement formées sur le circuit souple 60, plutôt que d'être réalisées à partir de bandes souples tissées ou en film polymère distinctes du circuit souple 60. Les pistes conductrices 22 et 31 sont réalisées par exemple par dépôt puis gravure sélective directement sur le circuit souple 60. Les points de soudure 21 ne sont alors plus nécessaires. Les fentes 66 sont ajourées directement sur le circuit souple 60. La densité de pixels de l'afficheur souple ou de la matrice selon les deux modes de réalisation illustrés par la figure 3 est identique à celle du premier mode de réalisation de la figure 2. La figure 4 présente un autre mode de réalisation selon l'invention. Seules les principales différences avec les modes de réalisation vont être détaillées ci-dessous. Sur les figures, des références identiques désignent des éléments similaires. Les bandes souples parallèles 30 s'étendent selon une direction de trame (dans la direction X de la figure 4) et des bandes souples supplémentaires 35 sont tissées sur les bandes souples 30 dans une direction de chaîne (direction Y de la figure 4) perpendiculaire à la direction de trame des bandes souples 30, de manière à présenter un motif en alternance (selon le principe « 1 sur 2 »). Chaque section de bande souple non recouverte comporte un module LED 40. Derrière chaque module LED ou pixel d'une bande donnée, on trouve une section de bande souple dépourvue de module LED. Si la densité de l'écran ainsi obtenu est égale à celle des autres modes de réalisation, la densité par bande souple est deux fois moins importante. Ce mode de réalisation nécessite une étape supplémentaire de tissage de l'écran, à la main ou avec une machine adaptée. L'écran est ensuite soudé sur le circuit souple 60 via les points de soudure 21 afin de relier les pistes 22 aux unités de commande et d'alimentation 20. Dans l'exemple de la figure 4, le nombre d'unités de commande et d'alimentation 20 est de quatre, et le circuit souple 60 nécessite deux fois plus de pistes conductrices 22 que pour les modes de réalisation précédents. L'écran peut être collé sur le circuit souple 60 pour renforcer la cohérence mécanique de l'afficheur souple 50. Un circuit ainsi réalisé présente une grande souplesse grâce au tissage qui ménage des fentes 67 entre les bandes souples d'une même direction (direction de trame X ou de chaîne Y) et dans laquelle est introduite une bande souple de la direction perpendiculaire. Par ailleurs, la cohésion mécanique d'un afficheur selon l'invention peut être renforcée en déposant différentes couches textiles qui viendront en renfort de l'écran. La suite de l'exposé concerne l'adjonction d'un élément diffusant à un afficheur selon l'invention afin d'améliorer la qualité des images diffusées par l'écran. La figure 5 présente un afficheur 122 selon l'invention, comportant par exemple un afficheur 101 d'un type similaire à l'afficheur représenté aux figures 2 à 4, comportant un écran ou matrice d'affichage 102. Une matrice de 7x5 modules LED 106 espacés l'un de l'autre est soudée sur des pistes ou fils conducteurs transmettant les signaux de commande et d'alimentation des modules LED depuis au moins une unité de commande et d'alimentation. Cette dernière ainsi que les pistes ou fils conducteurs ne sont pas représentés sur la figure 5. L'afficheur 122 comprend en outre un élément diffusant 123 recouvrant les modules LED 106 de façon à diffuser la lumière provenant de deux LED adjacentes pour produire un affichage lumineux sensiblement continu sur une face 123a de l'élément diffusant 123 opposée aux LED. L'afficheur 101 et l'élément diffusant 123 sont représentés de façon non complètement superposée dans le seul but de pourvoir mettre en évidence la contribution de chacun des composants pris unitairement. Cet élément diffusant 123 accroît la visibilité de chaque LED en démultipliant sa surface d'émission au-delà de la surface d'émission de la LED. Il réalise une jointure continue artificielle de deux LED adjacentes allumées sur la face 123a. Avantageusement, l'afficheur souple 122 comprend en outre un élément de couverture non-diffusant 124 (représenté de façon non superposée comme pour l'élément diffusant 123) pour apporter un habillage spécifique à l'afficheur 122, par l'intermédiaire de matières textiles, de couleurs et de motifs de tissage ou de tricotage variés, qui facilite ainsi l'intégration dans un support textile. Cet élément de couverture 124 apporte en outre de nouvelles propriétés physiques à l'afficheur 101 par exemple d'étanchéité ou de résistances aux chocs. A noter que l'élément diffusant 123 pourrait lui-même intégrer les caractéristiques présentées ici par l'élément de couverture 124. L'élément diffusant 123 est souple et peut être une mousse, un tissu ou une structure en maille. L'élément diffusant 123 et l'élément de couverture 124 sont par exemple assemblés par contre-collage. L'un des avantages d'un afficheur avec un élément diffusant est de permettre la réalisation d'un affichage de dimensions importantes, possédant une très bonne lisibilité, en utilisant un nombre limité de LED par unité de surface. En effet, il permet d'espacer les sources lumineuses (ce qui a pour but de fournir un écran très souple), la jointure entre les points lumineux étant réalisée par l'élément diffusant. Parmi les avantages de l'afficheur 122 selon l'invention, il figure également une réalisation aisée et une puissance de fonctionnement proportionnelle limitée, car proportionnelle au nombre de sources lumineuses. La figure 6 est une coupe transversale de l'afficheur de la figure 5, au niveau de la dernière ligne en bas de l'afficheur 122. L'élément diffusant 123 représenté sur la figure 6 peut être constitué d'un matériau de type mousse. Il permet de positionner l'élément de couverture 124 à distance souhaitée des LED 106. La surface de la tâche lumineuse ou pixel visible depuis l'afficheur 122 selon l'invention considéré, sera donc fonction de l'angle du cône d'émission α d'une LED 106, de l'épaisseur d de l'élément diffusant 123, ainsi que de l'écartement e entre les LED 106. Les LED 106 sont par ailleurs noyées dans une résine souple 128, qui permet à l'afficheur 101 de résister aux contraintes mécaniques liées à la flexion. Il existe de nombreux autres modes de réalisation possibles de l'afficheur 122 selon l'invention, en fonction notamment du type d'élément diffusant 123 choisi. Par exemple, la lumière émise par les LED 106 peut être diffusée et diffractée à l'intérieur d'un élément diffusant constitué de cellules encapsulantes transparentes, avant d'être projetée sur l'élément de couverture 124. Ces cellules peuvent avantageusement ne pas être solidaires entre elles, et l'élément de couverture 124 ne pas être solidaire des cellules, ce qui garantit un maximum de flexibilité à l'afficheur. Dans un autre mode de réalisation d'un afficheur selon l'invention avec écran diffusant, la lumière émise par les LED est diffusée directement dans un élément diffusant assurant en outre les fonctions d'élément de couverture réalisé en un matériau présentant des caractéristiques spécifiques de conduction de la lumière, soit par la nature du matériau employé (polyester, polyamide..), soit par - ou en combinaison avec - sa mise en oeuvre (tissu, structure maille, non-tissé, mousse...). L'un des principaux avantages d'un afficheur selon l'invention est de pouvoir adapter les éléments le constituant en fonction de l'effet recherché ou des contraintes de souplesses notamment imposées. En effet, selon le choix notamment de l'élément diffusant, on peut générer à la surface de l'afficheur 122 des pixels plus ou moins grands, et donc utiliser plus ou moins de sources lumineuses, à définition d'image égale. On peut ainsi adapter la souplesse de l'afficheur, qui dépend notamment du nombre de sources lumineuses, en fonction de la souplesse souhaitée. Le support en tissu garni des sources lumineuses, un élément diffusant et éventuellement un élément de couverture peuvent être assemblés par collage. Dans un autre mode de réalisation, le support souple et l'élément diffusant peuvent être collés, l'élément de couverture étant simplement posé sur l'élément diffusant, afin de permettre le glissement de l'un sur l'autre. Cet effet de glissement présente l'avantage de diminuer la résistance à la flexion de l'ensemble de l'afficheur. Dans un autre mode de réalisation, l'élément diffusant et l'élément de couverture peuvent être assemblés par collage ou couture, puis peuvent être posés sur le support garni de sources lumineuses avec dans ce cas encore, une possibilité de glissement. Cet assemblage devra garantir un parfait maintien en contact des différentes composantes de l'afficheur : support garni de sources lumineuses, élément diffusant et élément de couverture pour pouvoir assurer une taille ainsi qu'une visibilité homogène des pixels à la surface de l'écran. Un autre aspect de l'invention se rapporte à une structure textile comportant un afficheur selon le premier aspect de l'invention. L'afficheur peut être assemblé, définitivement ou non, au reste de la structure textile de différentes manières ; au moyen de systèmes de mercerie classiques comme des fermetures éclair, des bandes souples Velcro, des boutons pression ou encore par couture. Dans un autre mode de réalisation, l'afficheur ou certains des éléments le constituant (par exemple le seul support en tissu garni de sources lumineuses, ou encore ce dernier recouvert d'un 'élément diffusant et/ou d'un élément de couverture), peut également être inséré dans une poche adéquate par l'intermédiaire d'une ouverture. Cette poche peut avoir une simple fonction de maintien avec transparence, ou inclure en outre, comme détaillé plus loin, un élément diffusant et/ou un élément de couverture. Cette poche peut en particulier permettre de retirer l'afficheur de la structure textile. Comme indiqué ci-dessus, un élément diffusant et/ou un élément de couverture peuvent être confectionnés dans la structure textile elle-même. Ils peuvent, par exemple faire partie d'une poche de maintien, comme évoqué plus haut et comme représenté en figure 7. Une chemise 125 présente une poche 126. Une pièce supérieure 127 de la poche 126, de forme sensiblement rectangulaire est constituée d'un élément diffusant et d'un élément de couverture par exemple cousus ensemble, l'élément de couverture étant disposé de façon à recouvrir la face de l'élément diffusant opposée aux LED, une fois l'afficheur introduit dans la poche comme indiqué ci-dessous. La périphérie de cette pièce supérieure est cousue, à l'exception d'un des côtés, sur le reste de la structure textile, en délimitant ainsi, sur le reste de la structure textile, une pièce inférieure de la poche, et un logement entre la pièce inférieure et la pièce supérieure de dimensions permettant d'y loger un afficheur 101 par exemple comme l'afficheur décrit sur les figures 2 à 4. Ce support peut être inséré par glissement dans la poche 126 comme représenté sur la figure 7. La poche est pourvue d'un système de fermeture 31 , par exemple une fermeture-éclair 31. L'élément de couverture sur la pièce supérieure 127 peut être adapté pour ne pas présenter de démarcation visible par rapport au reste de la surface de la chemise 125 lorsque l'afficheur est éteint. Les différentes possibilités d'assemblage entre le support en tissu garni de LED, un élément diffusant et un élément de couverture présentées dans le cas de l'afficheur selon l'invention sont bien entendu applicables dans le cas de la structure textile selon l'invention. Ainsi un afficheur selon l'invention présente de nombreux avantages notamment en terme de souplesse grâce à la relative liberté dont on dispose sur le nombre de sources lumineuses à utiliser, de qualité d'affichage de par une pixellisation rendue continue grâce à l'emploi d'un élément diffusant, d'encombrement, de poids et de simplicité de réalisation. Il permet la réalisation de structure textile communicante, garantissant à la fois un affichage de qualité, et un confort de port. The present invention relates to the field of flexible displays and more particularly flexible displays that can be integrated into textile supports, for example clothing. This is called "foldable" displays. The applications relate, among other things, to the advertising, security, signage, decoration, leisure and even events-related sectors. They relate in particular to the dissemination of visual information on a person's clothing, and allow this information to be perceived by people located in the immediate vicinity of the display. Current flexible display technologies have major drawbacks, which prevent their integration into textile supports. These drawbacks are, for example, too great a rigidity of the display, dimensions, and rigidity characteristics due to the integration of “hardware” electronic systems in textiles. The power consumption required, the weight and the impossibility of customizing the aesthetics of the screen according to the target textile support may also be incompatible with the type of application desired. The realization can also be difficult and therefore expensive. An object of the present invention is to provide a flexible display which is less affected by the above limitations, and in particular to optimize the flexibility and the deformable appearance of the display, and to propose technical solutions allowing several possible configurations. screen. Thus according to a first aspect, the invention provides a flexible display comprising: - a display matrix comprising discrete light sources fixed spacedly on the matrix and distributed over at least two substantially parallel flexible strips included in the matrix and, electrical conductors for each of the flexible strips connecting the discrete light sources of the same flexible strip in series, the parallel flexible strips being separated by slots, - control and power supply units for discrete light sources, and - a flexible circuit comprising conductive tracks connecting the control and power supply units to the electrical conductors of each strip. A display according to the invention has high flexibility or wrinkle characteristics, since it is designed from parallel flexible strips separated by slots enhancing the overall flexibility of the display. The use of several bands moreover allows a flexible band length more suited to the size of the matrix and to limit the loss of control and supply signal. Advantageously, the electrical control and supply units comprise means for addressing discrete light sources in series, via the conductive tracks of the flexible circuit and the electrical conductors of each flexible strip. At least one control unit may for example be arranged in a corner of the flexible display thus produced. In a preferred embodiment, each flexible strip comprises a plurality of substantially parallel electrical wires or tracks and the discrete light sources comprise at least two control and supply electrodes welded to each of the electrical wires or tracks. In another preferred embodiment, the parallel flexible strips consist of a flexible polymer film of the polyimide or PVC type. It is for example made of the material known under the brand "Kapton". Each flexible strip can then include tracks or electrically conductive wires onto which the discrete light sources are welded. In another preferred embodiment, each flexible strip consists of a fabric and has woven threads including electrically conductive threads used to transmit the control and power signals. The discrete light sources can then be soldered onto the conductor wires. Such a flexible strip of fabric can therefore be produced using tools known in the textile field. Each flexible strip thus makes it possible to route a control and supply signal from the control and supply units to the electroluminescent sources. Advantageously, the discrete light sources comprise light-emitting diodes (LED or "Light Emitting Diode"). According to a second aspect, the invention provides a textile structure comprising a display according to the invention. By the nature of the display, the integration of the latter into the textile structure can be done using conventional textile integration tools (sewing, heat sealing ...). Other characteristics and advantages of the invention will become apparent on reading the description which follows. This is purely illustrative and should be read with reference to the appended drawings in which: - Figure 1 shows a flexible strip intended for a flexible display according to the invention; - Figure 2 shows a flexible display according to the invention in a first embodiment; - Figure 3 shows a flexible display according to the invention in a second embodiment; - Figure 4 shows a flexible display according to the invention in a third embodiment; - Figure 5 shows a display according to the invention comprising a diffusing element and a covering element; - Figure 6 is a cross section of the display of Figure 6; - Figure 7 shows a textile structure according to the invention. FIG. 1 represents a flexible strip 1 intended for a flexible display according to the invention, comprising a flexible support 2 and electrical conductors 3 and 4. In a first embodiment of the flexible strip 1, the flexible support 2 can be a flexible polymer film of the polyimide or PVC type, it is for example made of the material known under the brand "Kapton". In this case, the electrical conductors 3 and 4 can be conductive metal tracks produced on the flexible support 2, for example by deposition then selective etching. Electrical conductors can also be wires conductors contained in the flexible support 2. They can be made of copper, tinned copper, silver copper, or golden copper, and be sheathed with a polymer resin (for example polyester) which electrically insulates them from each other. In a second embodiment of the flexible strip 1, the flexible support 2 is produced from woven threads. Among these threads are electrically conductive threads 3 and 4 woven in a mixture with other textile threads. The support 2 is woven for example according to a weave of the canvas type, with a sufficiently loose mesh (openwork) to be able to leave the conductive wires visible by segments. The wires used have a sufficiently high titration (or fineness) to give the fabric a good surface condition, sufficient to be able to serve as a support for the soldering using soldering tools on conventional printed circuits (roughness less than 0.15 mm) . The textile threads are, for example, electrically insulating and resistant to physical constraints, in particular from temperatures imposed by welding. They are for example made of cotton, polyester or polyamide. The conducting wires 3 and 4 are of the same nature as those described above. The flexible strip of FIG. 1 can be produced continuously so as to have a very long strip, which will be cut into a shorter strip according to the needs and the size of the flexible display that it is desired to constitute. It can also, in the case of the flexible strip of polymer film, be produced directly on a flexible circuit which may in this case comprise several parallel flexible strips as explained below in one of the embodiments according to the invention. In the rest of the description, the embodiments presented will interchangeably, unless otherwise specified, the flexible strips of polymer film or woven. In the example of FIG. 1, there are four conductive tracks or wires. Discrete light sources 10 are spaced apart on the flexible support 2 and connected to these tracks or conductive wires 3 and 4. The light sources 10 are electronic modules directly addressable in series comprising for example an LED of the CMS type ("Component Surface Mounted "), a shift register and an amplifier. These modules are called LED modules below. Each LED module 10 includes two power supply electrodes 11 and several data electrodes 12 (or control electrodes), for example two, to define the intensity value to be given to each LED. In the example in FIG. 1, the conductive tracks or wires 3 are intended for supplying the LED modules and connected to the supply electrodes 11, the conductive tracks or wires 4 are intended for supplying the control signal of the LED modules and are connected to the control electrodes 12. The electrodes of the LED modules are soldered on the tracks or conductive wires 3 and 4. The soldering must be short enough not to degrade the flexible support 2. For example, in the case of the use of electrical wires, the welds of the electrodes 11, 12 on the conductive wires 3 and 4 are made in a very short period of time and at a temperature sufficient to be able to very quickly rid the electrical wires of their insulating protection, which melts in the heat, and solder these wires, without, however, damaging the rest of the flexible strip. The flexible displays of the present invention are therefore formed from these flexible strips arranged in parallel. The LED modules can be soldered directly onto the flexible strips before the display is built up, or else welded later, once the strips are in place to form the display. FIG. 2 represents a first embodiment of a flexible display 50 according to the invention. In this example, four flexible bands 30 are used. Each flexible strip 30 comprises four LED modules 40 each forming a pixel. The whole forms a screen or display matrix. The flexible display shown therefore includes a screen or display matrix of 4x4 pixels. The flexible strips are cut to the desired length for the flexible display, then positioned in parallel and then welded one by one to a peripheral flexible circuit 60. The flexible circuit 60 is a support of the flexible polymer film type (polyimide or PVC, for example ), also commonly called flexible circuit or "flex". It includes tracks 22 connecting one or more control and supply units 20 to the flexible strips 30, via the solder points 21. The flexible circuit 60 preferably has an upper surface on the screen so as to be able to place the tracks 22 and the control and supply units 20 around the periphery of the flexible circuit 60, and therefore on the periphery of the screen. In the example of FIG. 2, the control and supply units 20 of the LED modules 40 are in the form of two control boxes 20 controlling and supplying several tracks 22, in this case four in number (two and two data). This set of four tracks 22 relays the four signals corresponding to the different tracks or conductive wires 31 of the flexible strips 30 via the different solder points 21. The LED modules are controlled in series by the control boxes 20. Each flexible strip 30 is retained via the solder points 21 on the flexible circuit 60. They are separated from one another by free spaces or slots 65 through which the flexible circuit 60 can be seen over the entire length of the strips. This allows a gain in flexibility of the flexible display 50. These same slots can also be cut on the flexible circuit 60 with respect to each slot 65. Furthermore, in addition to the solder points 21, the strips can also be glued to the flexible circuit 60 to reinforce the cohesion of the screen. The pixel density of the flexible display or of the matrix according to this embodiment, that is to say the number of LED modules or pixels per unit of area, is the same as that of each flexible strip 30. Figure 3 illustrates a second embodiment of the display according to the invention. Only the main differences between the embodiments of Figures 2 and 3 will be detailed below. In the figures, identical references designate similar elements. The screen can be produced in one piece independently of the flexible circuit 60. The flexible strips 30 are produced continuously so as to be integral with each other. For example, the number of pixels required in the direction Y of FIG. 3 is determined, which corresponds to as many flexible strips 30, and they are then manufactured in the direction X continuously, as in the case of the exposed single flexible strip. earlier. The strips thus produced share the same support which is then cut according to the length necessary for the screen in the direction X. The screen thus produced is then welded on the flexible circuit at the solder points 21 in order to connect the modules LED 40 to the control and supply units 20 via the conductive tracks 22. The flexible display thus produced is perforated at the level of the slots 66 in FIG. 3 in order to increase the flexibility of the display thus obtained. The slits can be more or less long, until reaching the length of the flexible strips (direction X). The cohesion of the assembly can be reinforced by gluing the rear surface of the screen to the flexible circuit 60. This embodiment has less mechanical complexity and better consistency than the first embodiment of FIG. 2. In a Another embodiment according to the invention, also illustrated by FIG. 3, the strips are directly formed on the flexible circuit 60, rather than being produced from flexible woven strips or made of polymer film distinct from the flexible circuit 60. The conductive tracks 22 and 31 are produced for example by deposition and then selective etching directly on the flexible circuit 60. The solder points 21 are then no longer necessary. The slots 66 are perforated directly on the flexible circuit 60. The pixel density of the flexible display or of the matrix according to the two embodiments illustrated in FIG. 3 is identical to that of the first embodiment of FIG. 2. Figure 4 shows another embodiment according to the invention. Only the main differences with the embodiments will be detailed below. In the figures, identical references designate similar elements. The parallel flexible bands 30 extend in a weft direction (in the X direction of Figure 4) and additional flexible bands 35 are woven on the flexible bands 30 in a warp direction (Y direction of Figure 4) perpendicular to the weft direction of the flexible strips 30, so as to present an alternating pattern (according to the “1 in 2” principle). Each section of flexible strip not covered includes an LED module 40. Behind each LED module or pixel of a given strip, there is a flexible strip section devoid of LED module. If the density of the screen thus obtained is equal to that of the other embodiments, the density per flexible strip is twice less. This embodiment requires an additional step of weaving the screen, by hand or with a suitable machine. The screen is then welded to the flexible circuit 60 via the solder points 21 in order to connect the tracks 22 to the control and supply units 20. In the example of FIG. 4, the number of control units and power supply 20 is four, and the flexible circuit 60 requires twice as many conductive tracks 22 as for the previous embodiments. The screen can be glued to the flexible circuit 60 to reinforce the mechanical coherence of the flexible display 50. A circuit thus produced has great flexibility thanks to the weaving which provides slots 67 between the flexible strips of the same direction (direction weft X or warp Y) and into which a flexible strip of the perpendicular direction is introduced. Furthermore, the mechanical cohesion of a display according to the invention can be reinforced by depositing different textile layers which will reinforce the screen. The remainder of the presentation concerns the addition of a diffusing element to a display according to the invention in order to improve the quality of the images broadcast by the screen. FIG. 5 presents a display 122 according to the invention, comprising for example a display 101 of a type similar to the display shown in FIGS. 2 to 4, comprising a screen or display matrix 102. A matrix of 7 × 5 LED modules 106 spaced apart from each other is welded onto conductive tracks or wires transmitting the control and supply signals of the LED modules from at least one control and supply unit. The latter as well as the conductive tracks or wires are not shown in FIG. 5. The display 122 also comprises a diffusing element 123 covering the LED modules 106 so as to diffuse the light coming from two LEDs adjacent to produce a substantially continuous light display on a face 123a of the diffusing element 123 opposite the LEDs. The display 101 and the diffusing element 123 are shown in a manner which is not completely superimposed for the sole purpose of being able to highlight the contribution of each of the components taken individually. This diffusing element 123 increases the visibility of each LED by multiplying its emission surface beyond the emission surface of the LED. It performs an artificial continuous join of two adjacent LEDs lit on the face 123a. Advantageously, the flexible display 122 further comprises a non-diffusing covering element 124 (shown in a non-superimposed manner as for the diffusing element 123) to provide a specific covering for the display 122, by means of textile materials. , of different colors and weaving or knitting patterns, which thus facilitates integration into a textile support. This covering element 124 also brings new physical properties to the display 101, for example sealing or impact resistance. Note that the diffusing element 123 could itself integrate the characteristics presented here by the covering element 124. The diffusing element 123 is flexible and can be a foam, a fabric or a mesh structure. The diffusing element 123 and the covering element 124 are for example assembled by laminating. One of the advantages of a display with a diffusing element is that it makes it possible to produce a display of large dimensions, having very good readability, by using a limited number of LEDs per unit of area. Indeed, it allows spacing the light sources (which aims to provide a very flexible screen), the joint between the light points being produced by the diffusing element. Among the advantages of the display 122 according to the invention, there is also an easy embodiment and a limited proportional operating power, since it is proportional to the number of light sources. FIG. 6 is a cross section of the display of FIG. 5, at the level of the last line at the bottom of the display 122. The diffusing element 123 shown in FIG. 6 can be made of a foam type material. It allows the covering element 124 to be positioned at the desired distance from the LEDs 106. The surface of the light spot or pixel visible from the display 122 according to the invention considered, will therefore depend on the angle of the emission cone α an LED 106, the thickness d of the diffusing element 123, as well as the spacing e between the LEDs 106. The LEDs 106 are also embedded in a flexible resin 128, which allows the display 101 to resist the mechanical stresses linked to bending. There are many other possible embodiments of the display 122 according to the invention, depending in particular on the type of diffusing element 123 chosen. For example, the light emitted by the LEDs 106 can be diffused and diffracted inside a diffusing element made up of transparent encapsulating cells, before being projected onto the covering element 124. These cells may advantageously not be integral with each other, and the cover element 124 not be integral with the cells, which guarantees maximum flexibility on the display. In another embodiment of a display according to the invention with a diffusing screen, the light emitted by the LEDs is diffused directly in a diffusing element further ensuring the functions of covering element made of a material having specific characteristics of light conduction, either by the nature of the material used (polyester, polyamide, etc.), or by - or in combination with - its use (fabric, mesh structure, non-woven fabric, foam, etc.). One of the main advantages of a display according to the invention is to be able to adapt the elements constituting it according to the desired effect or in particular the constraints of flexibility imposed. Indeed, depending on the choice in particular of the diffusing element, it is possible to generate on the surface of the display 122 more or less large pixels, and therefore use more or less light sources, with equal image definition. We can thus adapt the flexibility of the display, which depends in particular on the number of light sources, according to the desired flexibility. The fabric support lined with light sources, a diffusing element and possibly a covering element can be assembled by gluing. In another embodiment, the flexible support and the diffusing element can be glued, the covering element being simply placed on the diffusing element, in order to allow the sliding of one over the other. This sliding effect has the advantage of reducing the flexural strength of the entire display. In another embodiment, the diffusing element and the covering element can be assembled by gluing or sewing, then can be placed on the support furnished with light sources with, in this case also, a possibility of sliding. This assembly must guarantee perfect contact between the various components of the display: support fitted with light sources, diffusing element and covering element to be able to ensure a size as well as a uniform visibility of the pixels on the screen surface. Another aspect of the invention relates to a textile structure comprising a display according to the first aspect of the invention. The display can be assembled, definitively or not, to the rest of the textile structure in different ways; using conventional haberdashery systems such as zippers, flexible Velcro straps, press studs or even sewing. In another embodiment, the display or some of the elements constituting it (for example the only fabric support lined with light sources, or the latter covered with a 'diffusing element and / or a covering element) , can also be inserted into a suitable pocket through an opening. This pocket can have a simple holding function with transparency, or also include, as detailed below, a diffusing element and / or a covering element. This pocket can in particular allow the display to be removed from the textile structure. As indicated above, a diffusing element and / or a covering element can be made in the textile structure itself. They can, for example be part of a holding pocket, as mentioned above and as shown in Figure 7. A shirt 125 has a pocket 126. An upper part 127 of pocket 126, of substantially rectangular shape, consists of a diffusing element and a covering element, for example sewn together, the covering element being arranged so as to cover the face of the diffusing element opposite to the LEDs, once the display inserted in the pocket as indicated below. The periphery of this upper part is sewn, with the exception of one of the sides, on the rest of the textile structure, thus delimiting, on the rest of the textile structure, a lower part of the pocket, and a housing between the lower part and the upper part making it possible to accommodate a display 101 there, for example like the display described in FIGS. 2 to 4. This support can be inserted by sliding into the pocket 126 as shown in FIG. pocket is provided with a closure system 31, for example a zipper 31. The cover element on the upper part 127 can be adapted so as not to have any visible demarcation with respect to the rest of the surface of the shirt 125 when the display is off. The different assembly possibilities between the fabric support furnished with LEDs, a diffusing element and a covering element presented in the case of the display according to the invention are of course applicable in the case of the textile structure according to the invention . Thus, a display according to the invention has many advantages, in particular in terms of flexibility thanks to the relative freedom which is available in the number of light sources to be used, in terms of display quality due to pixelation made continuous by the use of 'a diffusing element, size, weight and simplicity of implementation. It allows the creation of a communicating textile structure, guaranteeing both quality display and wearing comfort.

Claims

REVENDICATIONS
1. Afficheur souple (50) comportant : une matrice d'affichage comportant des sources lumineuses discrètes (10, 40) fixées de façon espacée sur ladite matrice et réparties sur au moins deux bandes souples (1 , 30) sensiblement parallèles incluses dans ladite matrice et, des conducteurs électriques (3, 4, 31) pour chacune desdites bandes souples reliant les sources lumineuses discrètes d'une même bande souple en série, les bandes souples parallèles étant séparées par des fentes (65, 66,67),1. Flexible display (50) comprising: a display matrix comprising discrete light sources (10, 40) fixed spacedly on said matrix and distributed over at least two substantially parallel flexible strips (1, 30) included in said matrix and, electrical conductors (3, 4, 31) for each of said flexible strips connecting the discrete light sources of the same flexible strip in series, the parallel flexible strips being separated by slots (65, 66,67),
- des unités de commande et d'alimentation (20) des sources lumineuses discrètes (10, 40), et un circuit souple (60) comportant des pistes conductrices (22) reliant les unités de commandes et d'alimentation aux conducteurs électriques de chaque bande.- control and supply units (20) of the discrete light sources (10, 40), and a flexible circuit (60) comprising conductive tracks (22) connecting the control and supply units to the electrical conductors of each bandaged.
2. Afficheur souple selon la revendication 1 , dans lequel les unités de commande et d'alimentation électriques comprennent des moyens d'adressage en série des sources lumineuses discrètes.2. Flexible display according to claim 1, in which the electrical control and supply units comprise means for addressing in series discrete light sources.
3. Afficheur souple selon les revendications 1 ou 2, dans lequel les conducteurs électriques de chacune desdites bandes souples comportent une pluralité de fils ou de pistes électriques (3, 4, 31) sensiblement parallèles, et dans lequel les sources lumineuses discrètes comportent au moins deux électrodes (11 ,12) de commande et d'alimentation soudées à chacun des fils ou pistes électriques desdits conducteurs électriques.3. flexible display according to claims 1 or 2, wherein the electrical conductors of each of said flexible strips comprise a plurality of son or electrical tracks (3, 4, 31) substantially parallel, and wherein the discrete light sources comprise at least two control and supply electrodes (11, 12) welded to each of the wires or electrical tracks of said electrical conductors.
4. Afficheur souple selon les revendications 1 à 3, dans lequel chacune des bandes souples parallèles est constituée d'un substrat ou film polymère incluant lesdits conducteurs électriques sous forme de pistes (3, 4, 31) auxquelles sont reliés les sources lumineuses discrètes. 4. Flexible display according to claims 1 to 3, wherein each of the parallel flexible strips consists of a polymer substrate or film including said electrical conductors in the form of tracks (3, 4, 31) to which the discrete light sources are connected.
5. Afficheur souple selon les revendications 1 à 3, dans lequel chacune des bandes souples parallèles est constituée d'un support en tissu comportant des fils tissées incluant lesdits conducteurs électriqeus sous forme de fils électriquement conducteurs (3, 4, 31).5. Flexible display according to claims 1 to 3, wherein each of the parallel flexible strips consists of a fabric support comprising woven son including said electric conductors in the form of electrically conductive son (3, 4, 31).
6. Afficheur souple selon les revendications 1 à 5, dans lequel les bandes souples sont soudées parallèlement les unes aux autres sur les pistes conductrices du circuit souple pour former ladite matrice.6. Flexible display according to claims 1 to 5, wherein the flexible strips are welded parallel to each other on the conductive tracks of the flexible circuit to form said matrix.
7. Afficheur souple selon les revendications 1 à 5, dans lequel les bandes souples sensiblement parallèles sont réalisées sur un support unique de façon à être solidaire les unes des autres et former ladite matrice, ledit support unique étant ensuite percé de fentes (66) entre chaque bande.7. flexible display according to claims 1 to 5, wherein the substantially parallel flexible strips are produced on a single support so as to be integral with each other and form said matrix, said single support then being pierced with slots (66) between each strip.
8. Afficheur souple selon la revendication précédente, dans lequel le circuit souple constitue ledit support unique dans lequel les bandes souples parallèles sont réalisées.8. Flexible display according to the preceding claim, in which the flexible circuit constitutes said single support in which the parallel flexible strips are produced.
9. Afficheur souple selon les revendications 1 à 5, dans lequel les bandes souples parallèles constituent une direction de trame et des bandes souples supplémentaires (35) sont tissées sur lesdites bandes souples parallèles dans une direction de chaîne normale à la direction de trame desdites bandes souples parallèles, de manière à présenter un motif en alternance, chaque section de bande souple non recouverte étant destinée à recevoir une source lumineuse discrète.9. Flexible display according to claims 1 to 5, in which the parallel flexible strips constitute a weft direction and additional flexible strips (35) are woven on said flexible strips parallel in a warp direction normal to the weft direction of said strips flexible parallel, so as to present an alternating pattern, each section of flexible strip not covered being intended to receive a discrete light source.
10. Afficheur souple selon l'une quelconque des revendications précédentes, dans lequel les sources lumineuses discrètes comprennent des diodes électroluminescentes (10, 40).10. Flexible display according to any one of the preceding claims, in which the discrete light sources comprise light-emitting diodes (10, 40).
11. Afficheur souple selon l'une quelconque des revendications précédentes comportant un élément diffusant recouvrant les sources lumineuses de façon à diffuser la lumière provenant de deux sources lumineuses discrètes adjacentes pour produire un affichage lumineux sensiblement continu sur une face (123a) de l'élément diffusant (123) opposée aux sources lumineuses (10, 40, 106).11. Flexible display according to any one of the preceding claims, comprising a diffusing element covering the light sources so as to diffuse the light coming from two discrete light sources. adjacent to produce a substantially continuous light display on one side (123a) of the diffusing element (123) opposite the light sources (10, 40, 106).
12. Afficheur souple selon la revendication 11 comportant un élément de couverture (124) de ladite face (123a) de l'élément diffusant.12. Flexible display according to claim 11 comprising a cover element (124) of said face (123a) of the diffusing element.
13. Afficheur souple selon les revendications 10 à 12, dans lequel les diodes électroluminescentes (10, 40, 106) sont noyées dans une résine souple (128).13. Flexible display according to claims 10 to 12, wherein the light emitting diodes (10, 40, 106) are embedded in a flexible resin (128).
14. Structure textile (125) comportant un afficheur souple (50) selon l'une des revendications précédentes.14. Textile structure (125) comprising a flexible display (50) according to one of the preceding claims.
15. Structure textile (125) selon la revendication 14 présentant une poche (126) pourvue d'une pièce inférieure et d'une pièce supérieure (127) laissant passer la lumière, entre lesquelles sont maintenus l'afficheur souple (50)15. Textile structure (125) according to claim 14 having a pocket (126) provided with a lower part and an upper part (127) allowing the light to pass through, between which the flexible display (50) is held.
16. Structure textile (125) selon la revendication 15 dans laquelle la poche (126) comporte des moyens (131) pour extraire l'afficheur souple (50).16. Textile structure (125) according to claim 15 wherein the pocket (126) comprises means (131) for extracting the flexible display (50).
17. Structure textile (125) selon les revendications 14 à 16 dans laquelle la pièce supérieure (127) incorpore l'élément diffusant (123) de l'afficheur souple (50).17. Textile structure (125) according to claims 14 to 16 in which the upper part (127) incorporates the diffusing element (123) of the flexible display (50).
18. Structure textile (125) selon l'une quelconque des revendications 14 à 17 dans laquelle la pièce supérieure (127) comporte en surface un élément de couverture (124) de ladite face (123a) de l'élément diffusant. 18. Textile structure (125) according to any one of claims 14 to 17 in which the upper part (127) has on the surface a covering element (124) of said face (123a) of the diffusing element.
PCT/FR2004/000398 2004-02-20 2004-02-20 Structures with variable dimensions for a flexible led display WO2005091258A1 (en)

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DE602004008345T DE602004008345T2 (en) 2004-02-20 2004-02-20 STRUCTURES WITH VARIABLE DIMENSIONS FOR FLEXIBLE LED DISPLAY DEVICE
PCT/FR2004/000398 WO2005091258A1 (en) 2004-02-20 2004-02-20 Structures with variable dimensions for a flexible led display
AT04713097T ATE370492T1 (en) 2004-02-20 2004-02-20 STRUCTURES WITH VARIABLE DIMENSIONS FOR FLEXIBLE LED DISPLAY DEVICE
EP04713097A EP1716553B1 (en) 2004-02-20 2004-02-20 Structures with variable dimensions for a flexible led display

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DE602004008345T2 (en) 2008-05-15
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DE602004008345D1 (en) 2007-09-27

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