DE10008062B4 - LED display module - Google Patents

Abstract

LED display module with a display glass (1) and an arranged below this light guide (2), the display glass (1) and the light guide (2) are held by a glass holder (3), which has an edge region for supporting the display glass (1) and the glass holder (3) with the open side of a channel (6) on one Printed circuit board (5) is mounted, wherein on the circuit board (5) in Region of the channel (6) at least one upward-emitting LED (4) is provided, and the channel (6) in the upper closed area an opening towards the light guide (2), characterized in that the glass holder (3) in one piece accomplished is and a plane Recess for receiving the light guide (2), a plurality of light-emitting diodes (4) are provided and the opening as an open longitudinal slot (7) is formed, which is arranged such that the light guide (2) is not directly illuminated by the LEDs (4).

Description

The The present patent application relates to an LED display module according to the preamble of claim 1.

Around To illuminate displays with LEDs, are currently substantially two possibilities to disposal.

It are used upwardly radiating standard LEDs, which are mounted below the display glass on the circuit board. The Light is over a light guide laterally deflected, scattered and distributed. This leads to a space-consuming arrangement with a relatively large distance between the display glass and the components to be connected. If the LEDs are too close to the glass, they become hot spots Visible, that is, one sees through the display glass directly on the light-emitting diodes. However, this is a very cheap solution because upwardly radiating standard light-emitting diodes, which are very cheap, can be used.

A different possibility The lighting of a display is that the side emitting light emitting diodes be provided laterally from the display, the light in turn a light guide is distributed under the display glass. in this connection Although the thickness of the overall arrangement can be reduced, however The arrangement is many times more expensive than when radiating upwards LEDs are used since laterally emitting LEDs are very expensive.

From the document JP 11344705 A is an LED display module as indicated above with a display glass and an arranged below this light guide, wherein the display glass and the light guide are held by a glass holder having an edge region for supporting the display glass and the glass holder with the open side of a channel mounted on a circuit board. At least one upward-emitting LED is provided on the circuit board in the region of the channel. In addition, the channel in the upper closed area on an opening to the light guide out.

Besides that is from the document US 6007209 an arrangement for the backlight of a display component, in which channels are provided with LEDs at side edges of a glass holder. In this case, the glass holder can also be made of plastic.

task The present invention is an LED display module of the above specify type mentioned, which is characterized by a small footprint and which is inexpensive to manufacture.

These The object is solved by the characterizing features in claim 1.

The inventive LED display module is inexpensive to produce, since upwardly radiating standard LEDs can be used. Another advantage is the much smaller footprint, since in the LED display module according to the invention the LEDs are placed directly under the display glass can. Another advantage is that there are no hot spots, because the LEDs are completely covered.

Further expedient embodiments and advantages of the LED display module according to the invention emerge from the dependent claims and the following description of an embodiment.

following the present invention will be described with reference to a drawing embodiment described in more detail.

It demonstrate

1 a cross section through an inventive LED display module, and

2 a partially cutaway perspective view of the in 1 illustrated LED display module from below.

The LED display module according to the invention consists essentially of the actual display glass 1 , which has a connection foil 8th is controlled, and one below the display glass 1 arranged light guides 2 for lighting the display.

According to the invention, the unit is now made of display glass 1 and light guides 2 from a glass holder 3 held. This glass holder 3 can be for example a plastic body. The glass holder 3 has a flat recess, which for receiving the light guide 2 is trained. In addition, the glass holder 3 designed such that the display glass 1 rests in the edge area.

At least one side edge of the glass holder 3 a channel-like web on, wherein the channel 6 is open at the bottom. This channel 6 extends at least in each case over the side length of the light guide 2 , In the upper closed area of the canal 6 this one has a slot 7 which leads to the light guide 2 is open. This slot 7 serves as a so-called light feed slot.

The one with the display glass 1 and the light guide 2 equipped glass holder 3 becomes with its channel-like webs with the open side of the channels 6 on a corresponding circuit board 5 assembled. In the area of the channels 6 are upward emitting light emitting diodes 4 intended. In this case, a plurality of light emitting diodes in a channel 4 be provided.

That of the light-emitting diodes 4 emitted light hits the walls of the channel 6 and from these becomes the longitudinal slot 7 reflected back.

For this purpose, the walls of the channels are preferably formed white, which is the case when as a glass holder 3 a white plastic body is used.

But it is also conceivable that as a glass holder 3 a dark plastic body is used and then the respective surfaces forming the channel 6 form, white or reflective are formed.

The glass holder 3 additionally protects the light emitting diodes 4 from external stress. Furthermore, this type of arrangement allows a more uniform distribution of light than laterally emitting LEDs. Another advantage is the much smaller footprint, as the LEDs 4 below the actual display glass 1 are arranged.

Claims (6)

LED display module with a display glass ( 1 ) and an optical waveguide ( 2 ), whereby the display glass ( 1 ) and the light guide ( 2 ) of a glass holder ( 3 ), which has a peripheral area for supporting the display glass ( 1 ) and the glass holder ( 3 ) with the open side of a channel ( 6 ) on a printed circuit board ( 5 ) is mounted, wherein on the circuit board ( 5 ) in the area of the channel ( 6 ) at least one upwardly emitting LED ( 4 ), and the channel ( 6 ) in the upper closed area an opening to the light guide ( 2 ), characterized in that the glass holder ( 3 ) is made in one piece and a planar recess for receiving the light guide ( 2 ), a plurality of light emitting diodes ( 4 ) are provided and the opening as an open longitudinal slot ( 7 ) is arranged, which is arranged such that the optical fiber ( 2 ) from the light emitting diodes ( 4 ) is not directly illuminated. LED display module according to claim 1, characterized in that in each case at two opposite side edges of the glass holder ( 3 ) a channel ( 6 ) with upwardly emitting light-emitting diodes ( 4 ) is provided. LED display module according to claim 1, characterized in that in each case at three side edges of the glass holder ( 3 ) a channel ( 6 ) with upwardly emitting light-emitting diodes ( 4 ) is provided. LED display module according to one of claims 1 to 3, characterized in that the glass holder ( 3 ) is a white plastic body. LED display module according to one of claims 1 to 3, characterized in that the channels ( 6 ) forming surfaces of the glass holder ( 3 ) are white. LED display module according to one of claims 1 to 3, characterized in that the channels ( 6 ) forming surfaces of the glass holder ( 3 ) are formed as reflective layers.