US20060077323A1 - Liquid crystal display and electronic apparatus - Google Patents
Liquid crystal display and electronic apparatus Download PDFInfo
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- US20060077323A1 US20060077323A1 US10/960,139 US96013904A US2006077323A1 US 20060077323 A1 US20060077323 A1 US 20060077323A1 US 96013904 A US96013904 A US 96013904A US 2006077323 A1 US2006077323 A1 US 2006077323A1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133707—Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1341—Filling or closing of cells
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- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Liquid Crystal (AREA)
Abstract
To reduce the operation time of the manufacturing process by decreasing the delay in the time required for injecting the liquid crystal due to the projections formed on the panel for controlling the alignment of the liquid crystal. Protrusions for controlling the alignment of liquid crystal are disposed throughout a panel. The longitudinal axes of the protrusions are arranged so that they are not in parallel with (or, more specifically, they are substantially orthogonal to) an edge of the panel having a liquid crystal inlet. In this way, the flow resistance of the liquid crystal is reduced, and the liquid crystal can be injected smoothly.
Description
- 1. Field of Invention
- Aspects of the invention can relate to a liquid crystal display and an electronic apparatus. More specifically, the invention can relate to a liquid crystal display including vertically aligned liquid crystal and providing an image with a high contrast and a wide viewing angle.
- 2. Description of Related Art
- Related art liquid crystal displays can include transreflective liquid crystal displays having a reflective mode and a transmissive mode. One of such transreflective liquid crystal displays includes a liquid crystal layer interposed between an upper substrate and a lower substrate. On the inner surface of the lower substrate there is a metal reflective film, which, for example, is composed of aluminum, having a window for transmitting light. The reflective film functions as a transreflective plate. In such a case, in the reflective mode, external light entering from the upper substrate passes through the liquid crystal layer, and is reflected at the inner surface of the lower surface. Then, the reflected light passes through the liquid crystal layer again and is emitted from the upper substrate to contribute to the display. In the transmissive mode, light entering from a backlight to the lower substrate passes through the liquid crystal layer via the window on the reflective film. Then, the light is emitted from the upper substrate to the outside to contribute to the display. In other words, within the region with the reflective film, the region where the window is formed is a transmissive display region and the region excluding the window is a reflective display region.
- Related art transreflective liquid crystal displays, however, have a problem in that the viewing angle is small in the transmissive mode. This small viewing angle is caused because reflective display can be accomplished by only one polarizer disposed on the side of the viewer due to the structure, wherein a transreflective plate is disposed on the inner surface of a liquid crystal cell, so that parallax is not generated. In other words, the flexibility of the optical design is small. To solve this problem, Jisaki et al., in, “Development of transreflective LCD for high contrast and wide viewing angle by using homeotropic alignment”, M. Jisaki et al., Asia Display/IDW'01, p. 133-136 (2001) have proposed a new liquid crystal display using vertically aligned liquid crystal. This related art liquid crystal display has the following three characteristics:
- 1) A vertical alignment mode in which the negative liquid crystal is vertically aligned by dielectric anisotropy and tilted by an applied voltage.
- 2) A multi-gap structure in which the thickness of the liquid crystal layer (cell gap) differs in the transmissive display region and the reflective display region. See, for example, Japanese Unexamined Patent Application Publication No. 11-242226 for the multi-gap structure.
- 3) A multi-domain structure in which alignment protrusion are formed of the center of the transmissive display region on an opposing substrate for omnidirectionally tilting the liquid crystal in the transmissive display region, which is shaped like a regular octagon.
- In a liquid crystal apparatus using a vertically aligned liquid crystal (a liquid crystal having a negative dielectric anisotropy) having a multi-domain structure without being subjected to rubbing, the tilting direction of the liquid crystal molecules must be controlled, as described above, by distorting the electric field in a pixel as a result of forming electrodes on parts of an opening in a pixel or forming dielectric projections on parts of the electrodes. When the alignment of the liquid crystal molecules is not sufficiently controlled, the liquid crystal molecules will be tilted randomly while maintaining a predetermined domain size on a plane. Under such conditions, some parts of the display region will have different optical characteristics, and, as a result, these regions will be defective in that they will appear grainy and uneven.
- To maintain a sufficient display quality, an alignment controlling device for controlling the alignment of the liquid crystal molecules, such as dielectric protrusions must be formed in the display region of the panel at a predetermined density. Unfortunately, when dielectric protrusions, are formed as alignment controlling device and the proportion of the area of the panel covered by the protrusions become greater, the protrusions get in the way and the time required for injecting the liquid crystal is increased. In particular, for a multi-gap structure, since the thickness of the cell in the reflective display region is small, the increase in the time required for injecting the liquid crystal becomes long.
- An aspect of the invention can provide a liquid crystal display and an electronic apparatus including this liquid crystal display, wherein the liquid crystal display is capable of reducing the operation time of the manufacturing process by decreasing the delay in the time required for injecting the liquid crystal due to the projections formed on the panel for controlling the alignment of the liquid crystal.
- To achieve the above-mentioned object, an exemplary liquid crystal display according to the invention can include a panel including a pair of opposing substrates and a liquid crystal layer supplied through a liquid crystal inlet provided on a predetermined edge of the panel and sealed inside the panel. Protrusions for controlling the alignment of the liquid crystal can be disposed unidirectionally over the entire panel and the longitudinal axis of the protrusions are not parallel with the predetermined edge of the panel.
- The liquid crystal flows radially from the inlet immediately after it is supplied. Then, after some time, when the liquid crystal reaches both ends of the predetermined edge on which the inlet is provided, the liquid crystal begins to flow orthogonally to the predetermined edge. In other words, the liquid crystal flows radially only in the beginning and then the entire liquid crystal flows linearly in a direction orthogonal to the predetermined edge. Therefore, by not disposing the longitudinal axis of the protrusions in a direction that interrupts the flow of the liquid crystal (i.e., a direction parallel to the predetermined edge), as the above-mentioned structure of the present invention, the liquid crystal can be supplied smoothly.
- In the structure above, it is desirable to arrange the longitudinal axes of the projections substantially orthogonal to the predetermined edge. In this way, the flow resistance of the supplied liquid crystal will be minimized.
- According to an aspect of the invention, a panel having a plurality of first projections aligned substantially in parallel to the predetermined edge and a plurality of second projections aligned substantially orthogonally to the first projections. In such a case, it is desirable to set the intervals between the first projections larger than the intervals between the second projections.
- The flow resistance of the liquid crystal is affected by the density of the projections formed in the midst of the flow. For example, the liquid crystal flows easily in a direction in which the projections are formed in low density and does no flow easily in a direction in which the projections are formed in high density. Thus, by forming projections in low density in parallel with the predetermined edge on the plane on which the liquid crystal flows on, as the above-mentioned structure, the liquid crystal can be injected smoothly.
- The structure described above is for a case in which the projections have longitudinal axes. Even when the projections do not have longitudinal axes (for example when the liquid crystal molecules have an isotropic shape such as a cone, a regular pyramid, or a hemisphere), the flow resistance of the supplied liquid crystal can be reduced as long as the density of the projections is set based on the flow direction of the liquid crystal. Therefore, to achieve the above-mentioned object, the structure described below may be applied.
- More specifically, the exemplary liquid crystal display according to the invention can include a panel including a pair of opposing substrates and a liquid crystal layer supplied through an liquid crystal inlet provided on a predetermined edge of the panel and sealed inside the panel. Protrusions for controlling the alignment of liquid crystal in the panel can be disposed substantially in parallel with and substantially orthogonally to the predetermined edge of the panel, and the density of the protrusions disposed in a first axial direction substantially in parallel with the predetermined edge of the panel (i.e., the proportion of the area occupied by the protrusions within a predetermined area when viewed along the first axial direction) projected onto the first axis is smaller than the density of the plurality of the protrusions disposed in a second axial direction substantially orthogonal to the predetermined edge of the panel projected on the second axis. Otherwise, the liquid crystal display includes a panel including a pair of opposing substrates and a liquid crystal layer supplied through an inlet provided on a predetermined edge of the panel and sealed inside the panel, wherein a plurality of protrusions for controlling the alignment of liquid crystal is disposed substantially in parallel with and substantially orthogonally to the predetermined edge of the panel, and the intervals between the protrusions disposed substantially in parallel with the predetermined edge of the panel is wider than the intervals between the protrusions disposed substantially orthogonal to the predetermined edge of the panel.
- According to such an exemplary structure, the protrusions are disposed sparsely on the surface parallel with the predetermined edge of the panel on which the liquid crystal flows. Thus, the liquid crystal can be injected smoothly, and the turnaround time of the manufacturing process can be shortened.
- The exemplary liquid crystal display according to the invention may use either a TN mode or a vertically aligned liquid crystal. When a liquid crystal display uses a vertically aligned liquid crystal (i.e., a liquid crystal having a negative dielectric anisotropy whose initial alignment direction is vertical) in the liquid crystal layer, the viscosity of the liquid crystal is high, and a long time is required to supply the liquid crystal. For this reason, the advantage of the invention becomes even more effective. In particular, when the liquid crystal display has a multi-gap structure (or, in other words, when the panel includes dot regions having transmissive display regions and reflective display regions, which include a liquid-crystal -layer thickness-adjustment layer for making the liquid crystal layer thickness of the reflective display region smaller than the liquid crystal layer thickness of the transmissive display region), the cell thickness of the reflective display region becomes small. Consequently, more time is required for supplying the liquid crystal, and, thus, the advantage of the present invention becomes more effective.
- An exemplary electronic apparatus according to the invention can include the above-described liquid crystal display. In this way, an electronic apparatus including a display having high display quality can be provided at a low cost.
- This invention will be described with reference to the accompanying drawings, wherein like numerals reference like elements, and wherein:
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FIG. 1 is an equivalent circuit diagram of a liquid crystal display according to a first exemplary embodiment of the invention; -
FIG. 2 is a plan view of the structure of dots of the liquid crystal display according to the first exemplary embodiment of the invention; -
FIG. 3 is a schematic plan view and a schematic cross-sectional view of the main component of the liquid crystal display according to the first exemplary embodiment of the invention. -
FIG. 4 illustrates the relationship between the positions of a liquid crystal inlet and protrusions of the liquid crystal display according to the first exemplary embodiment of the invention; -
FIG. 5 is a schematic plan view and a schematic cross-sectional view of the main component of a liquid crystal display according to a second exemplary embodiment of the invention; -
FIG. 6 illustrates the relationship between the positions of an inlet and protrusions of the liquid crystal display according to the second exemplary embodiment of the invention; -
FIG. 7 illustrates another relationship between the positions of an inlet and protrusions of the liquid crystal display according to the first exemplary embodiment of the invention; and -
FIG. 8 is a perspective view of an electronic apparatus according to an exemplary embodiment of the invention. - A first exemplary embodiment of the invention will be described by referring to FIGS. 1 to 4. For each drawing, the size of layers and components are modified to a size that is recognizable in the drawing.
- A liquid crystal display according to an exemplary embodiment described below is an active matrix liquid crystal display using a thin film diode (TFD) as a switching element and, in particular, is a transreflective liquid crystal display enabling reflective display and transmissive display.
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FIG. 1 illustrates an equivalent circuit of aliquid crystal display 100 according to a first exemplary embodiment of the invention. Theliquid crystal display 100 can include a scanningsignal driving circuit 110 and a datasignal driving circuit 120. Theliquid crystal display 100 has signal lines or, in other words, a plurality ofscanning lines 13 and a plurality ofdata lines 9 intersecting with the scanning lines 13. The scanning lines 13 are driven by the scanningsignal driving circuit 110 and thedata lines 9 are driven by the data signal drivingcircuit 120. Inpixel areas 150,TFD elements 40 and liquid crystal display elements 160 (a liquid crystal layer) are serially connected between thescanning lines 13 and the data lines 9. InFIG. 1 , theTFD elements 40 are connected to thescanning lines 13 and the liquidcrystal display elements 160 are connected to the data lines 9. Instead, however, theTFD elements 40 may be connected to thedata lines 9 and the liquidcrystal display elements 160 may be connected to the scanning lines 13. - By referring to
FIG. 2 , the planar structure (pixel structure) of electrodes included in the liquid crystal display I 00 according to the exemplary embodiment will be described. As illustrated inFIG. 2 , in theliquid crystal display 100 according to this exemplary embodiment,pixel electrodes 31 having a rectangular shape in plan view and connected to thescanning lines 13 viaTFD elements 40 are arranged in a matrix. Stripes ofcommon electrodes 9 face thepixel electrodes 31 and the page of the drawing. Thecommon electrodes 9 are composed of the data lines and are stripes intersecting with the scanning lines 13. In this exemplary embodiment, each region formed on each of thepixel electrodes 31 makes up a dot region. The dot regions arranged in a matrix each include one of theTFD elements 40. In this way, each dot region is capable of displaying a dot. - The
TFD elements 40 are switching elements for connecting thescanning lines 13 and thepixel electrodes 31. Each of theTFD elements 40 has an MIM structure including a first conductive film mainly composed of Ta, an insulating film formed on the surface of the first conductive film and mainly composed of Ta2O3, and a second conductive film formed on the surface of the insulating film and mainly composed of Cr. The first conductive film of each of theTFD elements 40 is connected to one of thescanning lines 13 and the second conductive film is connected to one of thepixel electrodes 31. - The pixel structure of the
liquid crystal display 100 according to this exemplary embodiment will be described by referring toFIG. 3 .FIG. 3 (a) is a schematic plan view of theliquid crystal display 100 and, in particular, thepixel electrodes 31.FIG. 3 (b) is a schematic cross-sectional view taken along Line A-A′ ofFIG. 3 (a). Theliquid crystal display 100 according to this embodiment has dot regions including thepixel electrodes 31 on the inner side of regions defined by thedata lines 9 and thescanning lines 13, as illustrated inFIG. 2 . As illustrated inFIG. 3 (a), each of the dot regions includes one colored layer corresponding to one of the three primary colors. Three dot regions (D1, D2, and D3) form a pixel including ablue layer 22B, agreen layer 22G, and ared layer 22R. - Next, the cross-sectional structure of the
liquid crystal display 100 according to this exemplary embodiment will be described. As illustrated inFIG. 3 (b), a rectangular sealing material (not depicted in the drawing) is interposed between a pair of opposingsubstrates substrates liquid crystal layer 50 formed of a liquid crystal material having a negative dielectric anisotropy is interposed. The panel according to this exemplary embodiment of the invention is prepared with the opposingsubstrates liquid crystal layer 50 is sealed inside an area surrounded by thesubstrates - The lower substrate (opposing substrate) 10 is prepared by disposing a
reflective film 20 composed of a metal film having a high reflectivity, such as an aluminum or silver film, on an insulatingfilm 24, which is further disposed on a part of the surface of asubstrate body 10A composed of a translucent material, such as quartz or glass. A color filter 22 (thered layer 22R in the case ofFIG. 3 (b)) is disposed over the entirelower substrate 10 to cover both the regions with and without thereflective film 20. Here, the region with thereflective film 20 is a reflective display region R and the region without thereflective film 20 or, in other words, anopening 21 in thereflective film 20 is a transmissive display region T. Theliquid crystal display 100 according to this embodiment is a vertical alignment liquid crystal display including a vertical-alignment-typeliquid crystal layer 50 and is also a transreflectiveliquid crystal display 100 capable of reflective display and transmissive display. - The insulating
film 24 formed on thesubstrate body 10A hasbumps 24a on its surface. The surface of thereflective film 20 disposed over the insulatingfilm 24 also has bumps on its surface. Since reflected light is dispersed by these bumps, reflection of external images can be prevented and the displayed image can have a wide viewing angle. The insulatingfilm 24 havingsuch bumps 24 a may be prepared by, for example, patterning a resin resist and applying another layer on this resin resist. Moreover, thebumps 24 a may be adjusted by heat processing the patterned resin resist. - The
color filter 22 is disposed over both the reflective display region R and the transmissive display region T. The rim of each colored layer making up thecolor filter 22 is outlined with a black matrix BM composed of elemental chrome. The black matrix BM defines the borders of each of the dot regions D1, D2, and D3 (refer toFIG. 3 (a)). - Furthermore, on the
substrate 10 at the region corresponding to the reflective display region R, an insulatingfilm 26 is disposed. More specifically, at the reflective display region R, the insulatingfilm 26 is selectively disposed above thereflective film 20. Since this insulatingfilm 26 is disposed, the thickness of theliquid crystal layer 50 differs in the reflective display region R and the transmissive display region T. The insulatingfilm 26 is, for example, composed of an organic film, such as an acrylic resin, having a thickness of about 0.5 to 2.5 μm and includes an inclined plane near the border of the reflective display region R and the transmissive display region T so that the thickness continuously changes. The thickness of theliquid crystal layer 50 in the transmissive display region T without the insulatingfilm 26 is about 1 to 5 μm. The thickness of theliquid crystal layer 50 in the reflective display region R is about half the thickness in the transmissive display region T without the insulatingfilm 26. In this way, the insulatingfilm 26 functions as a liquid-crystal-layer thickness-adjustment layer (liquid-crystal-layer thickness-controlling layer) for changing the thickness of theliquid crystal layer 50 in the reflective display region R and the transmissive display region T. - On the insulating
film 26 and thecolor filter 22, thecommon electrode 9 composed of indium tin oxide (hereinafter referred to as ITO) is provided. Moreover,protrusions 28 are formed on thecommon electrode 9 in the region corresponding to the transmissive display region T. - The
protrusions 28 function as liquid crystal alignment controlling means for controlling the tilting direction of the liquid crystal molecules and, for example, protrude from thecolor filter 22 into theliquid crystal layer 50 by a predetermined height (e.g., about 0.05 to 1.5 μm). Theprotrusions 28 are long in the Y-axis direction. The two side surfaces of each of theprotrusions 28 extending in the longitudinal direction (inFIG. 3 (a) these are parallel to the Y axis) are inclined at a predetermined angle (or curved slightly) with respect to the main surface of the substrate. In this way, the tilting direction of the liquid crystal molecules when a voltage is applied is controlled so that the molecules tilt in opposite direction on each side of the Y axis. Thus, a multi-domain arrangement becomes possible in each dot. - The
common electrode 9 is formed as stripes extending in the vertical direction of the page. Thecommon electrode 9 is disposed on each dot region aligned in the vertical direction of the page. Thecommon electrode 9 hasopenings 29 for controlling the liquid crystal alignment in the reflective display region R. By formingsuch openings 29, an oblique electric field is generated between thecommon electrode 9 and thepixel electrodes 31 in the region where the opening is formed. The tilting direction of the initially vertically aligned liquid crystal molecules is controlled in accordance with the oblique electric field. Accordingly, the alignment of the liquid crystal molecules can be controlled in both the transmissive display region T and the reflective display region R. In particular, in the reflective display region R, the horizontal electric field becomes large since the cell thickness is small compared to the transmissive display region T. Theopenings 29 formed on thecommon electrode 9 and notches 32 (described below) in thepixel electrodes 31 are formed so that they do not overlap with each other when viewed from above. Consequently, the tilting direction of the liquid crystal molecules LC between theopenings 29 and thenotches 32 can be controlled. - The
reflective film 20 and thecommon electrode 9 according to this exemplary embodiment are formed separately. However, a reflective film composed of a metal film may be used as a part of the common electrode in the reflective display region R. - On the
common electrode 9 and theprotrusions 28, analignment film 27 composed of polyimide is disposed. Thealignment film 27 functions as a vertical alignment film for vertically aligning the liquid crystal molecules relative to the surface of the film. Alignment processing, such as rubbing, is not carried out on thealignment film 27. - The upper substrate (elemental substrate) 25 is made up by disposing a matrix of the
pixel electrodes 31 composed of a transparent conductive film, such as ITO, on thesubstrate body 25A composed of a transmissive material such as glass or quartz (i.e., on the surface of thesubstrate body 25A facing the liquid crystal layer). Then, analignment film 33 composed of polyimide processed to have a vertical alignment similar to thelower substrate 10 is disposed over thepixel electrodes 31. - One
pixel electrode 31 is disposed for each of the dots D1, D2, and D3. A voltage is applied individually to each of thepixel electrodes 31 by a TFD disposed on each of the dots. Each of thepixel electrodes 31 according to this embodiment includes a plurality (two inFIG. 3 ) ofislands region 39 for electrically connecting neighboring islands. Theislands islands FIG. 3 is a regular octagon. The shape, however, is not limited to this and may be, for example, a circle or any type of polygon. Between theislands pixel electrodes 31, there are notches 32 (the regions between theislands electrode openings 29 and theprotrusions 28 on thesubstrate body 10A of thelower substrate 10 are formed substantially in the center of theislands - On the outer surface of the lower substrate 10 (the surface opposite to the surface facing the liquid crystal layer 50), a
wave plate 18 and apolarizing plate 19 are disposed. Also, on the outer surface of theupper substrate 25, awave plate 16 and apolarizing plate 17 are disposed. In this way, circularly polarized light is incident on the inner surface of the substrate (the surface facing the liquid crystal layer 50). Thewave plate 18 and thepolarizing plate 19, andwave plate 16 andpolarizing plate 17 form circular polarizing plates. The polarizing plate 17 (19) only transmits linearly polarized light having a polarization axis in a predetermined direction. The wave plate 16 (18) is a λ/4 wave plate. For such a polarizing plate, a combination of a polarizing plate, a λ/2 wave plate, and a λ/4 wave plate (i.e., a high-frequency circularly-polarizing plate) may also be used; in such a case, the black color displayed becomes more achromatic. Also, a combination of a polarizing plate, a λ/2 wave plate, a λ/4 wave plate, and a c plate (a wave plate having an optical axis in the film thickness direction) may be used to improve the viewing angle. On the outer side of thepolarizing plate 19 disposed on thelower substrate 10, abacklight 15 is disposed as a light source for transmissive display. - The
liquid crystal layer 50 is prepared by vacuum-injecting liquid crystal through a liquid crystal inlet formed on one of the sides (a predetermined edge of the panel) of the sealing material. -
FIG. 4 is a schematic view illustrating the positioning of theprotrusions 28 and the edge having the liquid crystal inlet. In the drawing, H indicates the liquid crystal inlet, 100A indicates the panel edge having the liquid crystal inlet H, 100B indicates both ends of the panel edge, and 40 indicates a sealant. The sealing material is not depicted inFIG. 4 since it is disposed along the edge of the substrate 25 (or substrate 10). - According to this exemplary embodiment, the longitudinal axes of the
protrusions 28 are arranged in an optimal direction relative to the flow direction of the liquid crystal to shorten the time required for the liquid crystal injection process. More specifically, as illustrated inFIG. 4 (a), the longitudinal axes of theprotrusions 28 are arranged so that they are not parallel to the direction in which thepredetermined edge 100A panel having the liquid crystal inlet H extends (the X-axis direction). In other words, the liquid crystal is injected radially from the inlet H immediately after the injection is started, but, when the liquid crystal reaches theends panel edge 100A having the inlet H after some time, the liquid crystal begins to flow in a direction orthogonal to theedge 100A (in the Y-axis direction). In other words, the liquid crystal flows radially only at the beginning of injection and, then, starts to flow in the Y-axis direction over the entire panel. Consequently, the liquid crystal can be injected smoothly by disposing theprotrusions 28 so that their longitudinal axes are not arranged in a direction that completely blocks the flow of the liquid crystal (i.e., the X-axis direction in parallel with thepanel edge 100A), as inFIG. 4 (b). - According to this exemplary embodiment, to minimized the flow resistance of the liquid crystal during injection, the longitudinal axes of the
protrusions 28 are arranged orthogonally (along the Y-axis direction) to the direction in which theedge 100A extends. The longitudinal axes do not necessarily have to be exactly orthogonal to theedge 100A; even when the longitudinal axes are somewhat tilted the flow resistance can be sufficiently reduced. In fact, the time required for injecting liquid crystal into panels having the structure illustrated inFIG. 4 (a) andFIG. 4 (b) was measured under the same conditions: the injection time for the panel ofFIG. 4 (b) was 90 minutes whereas the injection time for the panel ofFIG. 4 (a) according to this embodiment was only 40 minutes. In other words, by optimizing the direction of the longitudinal axes of theprotrusions 28, the liquid crystal injection time can be shorted by at least half. - As described above, the
liquid crystal display 100 according to this exemplary embodiment can have the following advantages. - In the
liquid crystal display 100 according to this exemplary embodiment, the thickness of theliquid crystal layer 50 in the reflective display region R can be reduced to substantially half of the thickness of theliquid crystal layer 50 in the transmissive display region T by disposing the insulatingfilm 26 at the reflective display region R. Therefore, the retardation contributing to reflective display and transmissive display becomes substantially equal and the contrast of the display is improved. - According to this exemplary embodiment, the tilting direction of the liquid crystal molecules can be controlled when a voltage is applied because of the effect of an oblique electric field due to the inclined surface of the
protrusions 28, theopenings 29, and thenotches 32. Thus, residual images accompanying the generation of a disclination or grainy, uneven spots observed from an oblique angle do not appear easily and high quality display becomes possible. - According to this exemplary embodiment, the longitudinal axes of the
protrusions 28, which are means for controlling the alignment of the liquid crystal, are arranged along the flow direction of the injected liquid crystal. Therefore, the flow resistance of the liquid crystal can be reduced, thus shortening the time required to inject the liquid crystal. In particular, theliquid crystal layer 50 according to this exemplary embodiment includes a vertically aligned liquid crystal having a high viscosity and has a multi-gap structure, causing a relatively long liquid crystal injection time. The injection time, however, can be shortened by the above-mentioned structure. In this way, the turnaround time of the manufacturing process can be greatly reduced. - A second exemplary embodiment according to the invention will be described by referring to FIGS. 5 to 7.
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FIG. 5 is a plan view and a cross-sectional view of a liquid crystal display according to this exemplary embodiment and is equivalent to the schematic view ofFIG. 3 illustrating the first exemplary embodiment of the invention. Parts and components according to this embodiment that are the same as those in the first embodiment are indicated by the same reference numerals. - A
liquid crystal display 200 according to this exemplary embodiment is a transmissive liquid crystal display not having a reflective display region. Theliquid crystal display 200 according to this embodiment has dot regions includingpixel electrodes 31 inside of regions defined bydata lines 9 andscanning lines 13, as illustrated inFIG. 5 (a). Each of the dot regions includes one colored layer corresponding to one of the three primary colors. Three dot regions (D1, D2, and D3) form a pixel including ablue layer 22B, agreen layer 22G, and ared layer 22R. - Next, the cross-sectional structure of the
liquid crystal display 200 according to this exemplary embodiment will be described. As illustrated inFIG. 5 (b), a rectangular sealing material (not depicted in the drawing) is interposed between a pair of opposingsubstrates substrates liquid crystal layer 50 formed of a liquid crystal material having a negative dielectric anisotropy is interposed. The panel according to this embodiment of the present invention is prepared with the opposingsubstrates liquid crystal layer 50 is sealed inside an area surrounded by thesubstrates - A lower substrate (opposing substrate) 10 can include a
common electrode 9 composed of ITO disposed on the surface of asubstrate body 10A composed of a transparent material such as quartz or glass.Protrusions 28 are formed on the surface of thecommon electrode 9. - The
protrusions 28 function as a liquid crystal alignment controlling device for controlling the tilting direction of the liquid crystal molecules. Theprotrusions 28, for example, protrude from thecommon electrode 9 into theliquid crystal layer 50 by a predetermined height (e.g., about 0.05 to 1.5 μm). Theprotrusions 28 have a surface inclined at a predetermined angle (or curved slightly) with respect to the surface of the substrate. In this way, the tilt of liquid crystal molecules is controlled along the inclined surface. The cross-sectional view of theprotrusions 28 is preferably substantially symmetrical. In particular, the shape of theprotrusions 28 may preferably be a cone, an elliptical cone, a poly-pyramid, a truncated cone, a truncated elliptical cone, a truncated poly-pyramid, or a hemisphere. In this way, the liquid crystal molecules will tilt in all directions when a voltage is applied, and, thus, a multi-directional multi-domain arrangement becomes possible. - The
common electrode 9 is formed of stripes extending in the vertical direction of the page of the drawing. Thecommon electrode 9 is disposed on each dot region aligned in the vertical direction of the page of the drawing. On thecommon electrode 9 and theprotrusions 28, analignment film 27 composed of polyimide is disposed. Thealignment film 27 functions as a vertical alignment film for vertically aligning the liquid crystal molecules relative to the surface of the film. Alignment processing, such as rubbing, has not been carried out on thealignment film 27. - The
upper substrate 25 is made up by disposing a color filter 22 (a redcolored layer 22R inFIG. 5 (b)) on the surface of asubstrate body 25A composed of a transparent material such as glass or quartz. On the surface of thecolor filter 22, a matrix ofpixel electrodes 31 composed of a transparent conductive film such as ITO is disposed. Then, analignment film 33 composed of polyimide processed to have a vertical alignment similar to thelower substrate 10 is disposed over thepixel electrodes 31. - One of each of the
pixel electrodes 31 is disposed for each of the dots D1, D2, and D3. A voltage is applied individually to each of thepixel electrodes 31 by a TFD disposed on each of the dots. Each of thepixel electrodes 31 according to this exemplary embodiment include a plurality (four inFIG. 5 ) ofislands region 39 for electrically connecting neighboring islands. Theislands islands FIG. 5 is a regular octagon. The shape, however, is not limited to this and may be, for example, a circle or any type of polygon. Between theislands pixel electrodes 31, there are notches 32 (the region between theislands protrusions 28 are formed substantially in the center of the subdots (or theislands - On the outer surface of the lower substrate 10 (the surface opposite to the surface facing the liquid crystal layer 50), a
wave plate 18 and apolarizing plate 19 are disposed. Also, on the outer surface of theupper substrate 25, awave plate 16 and apolarizing plate 17 are disposed. In this way, circularly polarized light is incident on the inner surface of the substrate (the surface facing the liquid crystal layer 50). Thewave plate 18 and thepolarizing plate 19, andwave plate 16 andpolarizing plate 17 form circular polarizing plates. The polarizing plate 17 (19) only transmits linearly polarized light having a polarization axis in a predetermined direction. The wave plate 16 (18) is a λ/4 wave plate. For such a polarizing plate, a combination of a polarizing plate, a λ/2 wave plate, and a λ/4 wave plate (i.e., a high-frequency circularly-polarizing plate) may also be used; in such a case, the black color displayed becomes more achromatic. Also, a combination of a polarizing plate, a λ/2 wave plate, a λ/4 wave plate, and a c plate (a wave plate having an optical axis in the film thickness direction) may be used to improve the viewing angle. On the outer side of thepolarizing plate 19 disposed on thelower substrate 10, abacklight 15 is disposed as a light source for transmissive display. - Also, in this exemplary embodiment, the
liquid crystal layer 50 is prepared by vacuum-injecting liquid crystal through a liquid crystal inlet formed on one of the sides (a predetermined edge of the panel) of the sealing material. According to this embodiment, the longitudinal axes of theprotrusions 28 are arranged in an optimal direction relative to the flow direction of the liquid crystal to shorten the time required for liquid crystal injection process. -
FIG. 6 is a schematic view illustrating the positioning of theprotrusions 28 and the edge having the liquid crystal inlet. In the drawing, H indicates the liquid crystal inlet, 100A indicates the panel edge having the liquid crystal inlet H, 100B indicates both ends of the panel edge, and 40 indicates a sealant. The sealing material is not depicted inFIG. 6 since it is disposed along the edge of the substrate 25 (or substrate 10). - In this exemplary embodiment, unlike the first exemplary embodiment, the
protrusions 28 are not oblong. Therefore, in this embodiment, to reduce the flow resistance of the liquid crystal during injection, the density of the disposedprotrusions 28 is varied according to the alignment direction. More specifically, as illustrated inFIG. 6 (a), the density of theprotrusions 28 aligned in parallel with thepanel edge 100A having the liquid crystal inlet H (or, aligned along the X-axis direction) projected onto the X axis (i.e., the proportion of the total area of theprotrusions 28 per unit axis length along the X axis direction) is smaller than the density of theprotrusions 28 aligned orthogonally to thepanel edge 100A (or, aligned along the Y-axis direction) projected onto the Y axis. Since theprotrusions 28 according to this embodiment have an isotropic shape, such as a cone, the above-mentioned structure can be rephrased as follows. The intervals of theprotrusions 28 in parallel with thepanel edge 100A having the liquid crystal inlet H (or, theprotrusions 28 aligned along the X-axis direction) are wider than the intervals of theprotrusions 28 orthogonal to panel edge 100A having the liquid crystal inlet H (or, theprotrusions 28 aligned along the Y-axis direction). - The flow resistance of the liquid crystal is affected by the density of the
protrusions 28, disposed in the path of the flow of the liquid crystal. The liquid crystal, for example, easily flows in a direction having a lower density ofprotrusions 28 but flows less easily in a direction having a higher density ofprotrusions 28. Thus, as the above-described structure, by sparsely disposing theprotrusions 28 in parallel with thepanel edge 100A (along the X-axis direction), that is, the surface on which the liquid crystal flows, the liquid crystal can be injected smoothly. Theprotrusions 28 do not necessarily have to be exactly in parallel with or orthogonal to theedge 100A having the liquid crystal inlet; even when theprotrusions 28 are somewhat tilted the flow resistance can be sufficiently reduced. - In fact, the time required for injecting liquid crystal into panels having the structure illustrated in
FIG. 6 (b) having theprotrusions 28 aligned in a pattern opposite to theprotrusions 28 inFIG. 6 (a) was measured under the same conditions: the injection time for the panel ofFIG. 6 (b) was 45 minutes whereas the injection time for the panel ofFIG. 6 (a) according to this embodiment was only 30 minutes. In other words, by optimizing the direction of the longitudinal axes of theprotrusions 28, the liquid crystal injection time can be shorted by about ⅔. - In
FIG. 6 (a), the number ofprotrusions 28 aligned in parallel with thepanel edge 100A is smaller the number ofprotrusions 28 aligned orthogonally to thepanel edge 100A (inFIG. 6 (a) the ratio is 3:5). It should be understood that the number of the disposedprotrusions 28 is not limited to this ratio. For example, the number ofprotrusions 28 aligned in either direction may be equal, as illustrated inFIG. 7 . It is desirable to minimize the number ofprotrusions 28 in parallel with thepanel edge 100A (along the X-axis direction), that is, the surface on which the liquid crystal flow on as much as possible (more specifically, the number ofprotrusions 28 in the X direction must be smaller than the number ofprotrusions 28 in the Y direction). In this way, the injection time of the liquid crystal can be shortened. - FIGS. 7(a) and 7(b) are both examples of a case wherein the number of
protrusions 28 aligned in the X direction and the number ofprotrusions 28 aligned in the Y direction are equal.FIG. 7 (a), similar to this embodiment, illustrates a case in which the density of theprotrusions 28 aligned in the X direction is less than the density of theprotrusions 28 aligned in the Y direction.FIG. 7 (b) illustrates a case in which the density of theprotrusions 28 aligned in the X direction is greater than the density of theprotrusions 28 aligned in the Y direction. For the structure illustrated inFIG. 7 (b), the liquid crystal injection time was 40 minutes whereas the injection time forFIG. 7 (a) was 30 minutes. Although the injection time becomes long by increasing the number ofprotrusions 28 aligned in the X direction (as illustrated inFIG. 7 (b)), the injection time can be shortened by arranging theprotrusions 28 with the above-mentioned density (i.e., arranging theprotrusions 28 so that the density of theprotrusions 28 aligned in the X direction is less than the density of theprotrusions 28 aligned in the Y direction). - Since, as described in this exemplary embodiment, the alignment of the liquid crystal is controlled by the
protrusions 28, which are alignment controlling means, residual images accompanying the generation of a disclination or grainy, uneven spots observed from an oblique angle do not appear easily and high quality display becomes possible. - In this exemplary embodiment, the density of the disposed
protrusions 28 is optimized based on the flow direction of the injected liquid crystal, the time required for the liquid crystal injection process, and the turnaround time for the entire manufacturing process can be shortened. - Next, an exemplary electronic apparatus having a liquid crystal display according to the above-described embodiments will be described.
-
FIG. 8 is a perspective view of a cellular phone according to an exemplary embodiment of the invention. InFIG. 8 , the cellular phone body is indicated by thereference numeral 1000, and the display including the above-mentioned liquid crystal display is indicated by thereference number 1001. When the liquid crystal display according to the above-mentioned embodiments is used for the display of an electronic apparatus such as a cellular phone, an electronic apparatus including a bright display having a high contrast and a wide viewing angle can be provided. In particular, since theliquid crystal display 1001 can be supplied at low cost because the turn-around time of the manufacturing process can be shortened, the cost of the entire electronic apparatus can be lowered. - It should be understood that the technical scope of the invention is not limited to the above-mentioned exemplary embodiments. Various modifications may be made within the scope of the present invention.
- For example, in the first exemplary embodiment, only the longitudinal axes of the
protrusions 28 were optimized relative to the flow direction of the liquid crystal. In addition, the density of theprotrusions 28 may also be optimized in the same manner as in the second embodiment. In other words, the intervals of theprotrusions 28 aligned in parallel with thepanel edge 100A having the liquid crystal inlet H (in the X-axis direction) may be wider than the intervals between theprotrusions 28 aligned orthogonally to thepanel edge 100A (in the Y-axis direction). In this way, the liquid crystal injection time can be shortened even more. - The liquid crystal display according to the above-mentioned exemplary embodiment of the invention is an active matrix liquid crystal display having a TDF as a switching element. The liquid crystal display according to the invention may be an active matrix liquid crystal display having a TFT as a switching element or a passive matrix liquid crystal display.
Claims (8)
1. A liquid crystal display, comprising:
a panel including a pair of opposing substrates; and
a liquid crystal layer that is supplied through an inlet provided on a predetermined edge of the panel and that is sealed inside the panel;
protrusions that control an alignment of the liquid crystal being unidirectionally disposed over the entire panel; and
longitudinal axes of the protrusions being disposed so that the axes are not parallel with the predetermined edge of the panel.
2. The liquid crystal display according to claim 1 , the longitudinal axes of the protrusions being substantially orthogonal to the predetermined edge of the panel.
3. The liquid crystal display according to claim 1 , the protrusions being disposed substantially in parallel with and substantially orthogonal to the predetermined edge of the panel; and
intervals between the protrusions that are disposed substantially in parallel with the predetermined edge of the panel being wider than the intervals of the protrusions that are disposed substantially orthogonal to the predetermined edge of the panel.
4. A liquid crystal display, comprising:
a panel including a pair of opposing substrates;
a liquid crystal layer that is supplied through an inlet provided on a predetermined edge of the panel and sealed that is inside the panel;
a plurality of protrusions that control an alignment of liquid crystal in the panel being disposed substantially in parallel with and substantially orthogonal to the predetermined edge of the panel; and
a density of the plurality of protrusions disposed in a first axial direction being substantially in parallel with the predetermined edge of the panel projected onto the first axis being smaller than a density of the plurality of protrusions disposed in a second axial direction substantially orthogonal to the predetermined edge of the panel projected on a second axis.
5. A liquid crystal display, comprising:
a panel including a pair of opposing substrates;
a liquid crystal layer that is supplied through an inlet provided on a predetermined edge of the panel and that is sealed inside the panel;
a plurality of protrusions that control an alignment of liquid crystal in the panel being disposed substantially in parallel with and substantially orthogonal to the predetermined edge of the panel; and
intervals between the protrusions disposed substantially in parallel with the predetermined edge of the panel being larger than intervals between the protrusions disposed substantially orthogonal to the predetermined edge of the panel.
6. The liquid crystal display according claim 1 , the liquid crystal layer including liquid crystal initially vertically aligned and having a negative dielectric anisotropy.
7. The liquid crystal display according to claim 6 ,
the panel being a plurality of dot regions, and each dot region including a transmissive display region for transmissive display and a reflective display region for reflective display; and
the reflective display region including a liquid-crystal-layer thickness-adjustment layer that makes a liquid crystal layer thickness of the reflective display region smaller than a liquid crystal layer thickness of the transmissive display region.
8. An electronic apparatus, comprising:
the liquid crystal display according to claim 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/335,462 US7573555B2 (en) | 2003-10-10 | 2006-01-20 | Liquid crystal display and electronic apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-352676 | 2003-10-10 | ||
JP2003352676A JP3873962B2 (en) | 2003-10-10 | 2003-10-10 | Liquid crystal display device and electronic device |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/335,462 Division US7573555B2 (en) | 2003-10-10 | 2006-01-20 | Liquid crystal display and electronic apparatus |
Publications (1)
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US20060077323A1 true US20060077323A1 (en) | 2006-04-13 |
Family
ID=34543538
Family Applications (2)
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US10/960,139 Abandoned US20060077323A1 (en) | 2003-10-10 | 2004-10-08 | Liquid crystal display and electronic apparatus |
US11/335,462 Expired - Fee Related US7573555B2 (en) | 2003-10-10 | 2006-01-20 | Liquid crystal display and electronic apparatus |
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US11/335,462 Expired - Fee Related US7573555B2 (en) | 2003-10-10 | 2006-01-20 | Liquid crystal display and electronic apparatus |
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US (2) | US20060077323A1 (en) |
JP (1) | JP3873962B2 (en) |
KR (1) | KR100664813B1 (en) |
CN (1) | CN100378523C (en) |
TW (1) | TW200530679A (en) |
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EP2083314A1 (en) * | 2008-01-24 | 2009-07-29 | TPO Displays Corp. | Liquid crystal display device |
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US20070040969A1 (en) * | 2005-08-18 | 2007-02-22 | Norihiro Yoshida | Liquid crystal display device |
JP4618188B2 (en) * | 2006-04-18 | 2011-01-26 | セイコーエプソン株式会社 | Liquid crystal display device and electronic device |
US8233648B2 (en) * | 2008-08-06 | 2012-07-31 | Samsung Electronics Co., Ltd. | Ad-hoc adaptive wireless mobile sound system |
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Also Published As
Publication number | Publication date |
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CN1605901A (en) | 2005-04-13 |
TW200530679A (en) | 2005-09-16 |
JP2005115275A (en) | 2005-04-28 |
KR100664813B1 (en) | 2007-01-04 |
US7573555B2 (en) | 2009-08-11 |
CN100378523C (en) | 2008-04-02 |
JP3873962B2 (en) | 2007-01-31 |
US20060114382A1 (en) | 2006-06-01 |
KR20050035107A (en) | 2005-04-15 |
TWI316627B (en) | 2009-11-01 |
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