JP2924025B2 - Liquid crystal display - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a liquid crystal display device provided with a backlight.

2. Description of the Related Art In recent years, many liquid crystal display devices used for word processors and the like have a backlight for improving visibility. Above all, with the demand for smaller and thinner devices, edge-lit backlights that introduce light from the end faces of the light guide plate and illuminate the entire liquid crystal display range are increasing.

In addition, as a transmissive liquid crystal display device for the backlight, an anisotropic conductive adhesive is used to connect the glass surface electrode of the liquid crystal display panel to a liquid crystal drive circuit formed by mounting a driver IC on a flexible substrate. Tab-connected liquid crystal display devices used are also widely used.

Conventionally, a general configuration in the case of using this tab connection type liquid crystal display device will be described below with reference to FIGS. 4 and 5. FIG.

As shown in FIG. 5, the electrodes formed on the glass surface of the liquid crystal panel 1 and the electrodes of the flexible substrate 2 on which the driver IC 5 for driving the liquid crystal are mounted are connected in a configuration sandwiching the anisotropic conductive adhesive 3. ing. Since the adhesive strength of the anisotropic conductive adhesive 3 is not sufficiently high, it is necessary to uniformly press and hold the connecting portion with an appropriate pressure F. It is a structure that is fixed by pressure with a simple structural member 6.

As shown in FIG. 4, a plurality of the rubber spacers 4 are used corresponding to the positions of the electrodes of the liquid crystal drive circuit 2 which are dispersedly provided around the liquid crystal panel 1. This rubber spacer 4
Is coated with a weak adhesive to stabilize the position of the rubber spacer 4 during assembly.

However, in such a conventional liquid crystal display device, it is necessary to attach a plurality of rubber spacers 4 on the liquid crystal panel and the liquid crystal driving circuit board. Therefore, it is necessary to prepare rubber spacers 4 having different thicknesses and lengths.

In addition, the rubber spacer 4 is often made of soft silicone rubber, and has a problem that the dimensional accuracy of the attachment is difficult to be obtained because the rubber spacer 4 is stretched at the time of attachment.

Further, as shown in FIG. 6, at the corners of the liquid crystal panel, there is a gap between the rubber spacers 4 that are adjacent to each other. From this gap, a gap is formed between the liquid crystal display panel 1 and the smooth structural member 6 for display. There was a problem that harmful dust, dust and the like easily enter.

Further, the adhesive applied to the rubber spacer 4 has a low adhesive strength for protecting the circuit board joint,
There is also a problem that displacement occurs after assembly.

Further, the rubber spacer 4 is usually made of translucent silicone rubber in many cases, and together with the clearance between the rubber spacers,
There was a problem that the light of the illumination of the edge light type backlight was leaked and the quality of the liquid crystal display was impaired.

An object of the present invention is to solve the above-mentioned problems, and to provide a liquid crystal display device which is inexpensive and realizes stable improvement of quality.

Means for Solving the Problems In order to achieve the above object, the present invention provides a liquid crystal display panel, a liquid crystal driving circuit board, a diffusion plate as a backlight component, and a liquid crystal driving circuit board and a diffusion plate. A position where the liquid crystal display panel and the liquid crystal drive circuit board are connected and fixed with an anisotropic conductive adhesive, and the elastic body is pressed at a connection portion between the liquid crystal display panel and the liquid crystal drive circuit board. And fixed to the diffusion plate. Further, the elastic body surrounds the entire periphery of the display range of the liquid crystal display panel and gives a shape connected to one body. Further, the elastic body is opaquely colored black or dark black.

According to the present invention, with the above-described configuration, the pressure applied to the connection portion of the liquid crystal display panel with the liquid crystal drive circuit board on the side facing the backlight unit can be collectively performed by a single member.
Variations in the positional dimensional accuracy of the conventional attachment can be eliminated. Further, since there is no gap between the conventional rubber spacers, it is possible to eliminate the adverse effect on the liquid crystal display due to the insertion of dust, dust, and the like.

Furthermore, compared to attaching the rubber spacer to the liquid crystal driving circuit board side, when the rubber spacer is fixed on the diffusion plate, the fixing force can be sufficiently increased by pressurization or heating. The problem of deviation can also be solved.

Further, a black frame can be formed on the entire periphery of the liquid crystal display range, and light leakage of edge light illumination can be prevented.

Embodiment An embodiment of the present invention will be described below with reference to FIGS.
This will be described with reference to FIGS.

FIG. 1 is an exploded perspective view of a liquid crystal display device according to a first embodiment of the present invention. As shown in FIG.
So that the joints of
The integrally formed rubber spacer 4 is fixed to the diffusion plate 6 which is a constituent member of the backlight unit so as to surround the liquid crystal display range.

FIG. 2 is a cross-sectional view of the liquid crystal display device according to the same embodiment. As shown in FIG.
The diffusion plate 6 is sandwiched between the liquid crystal display panel 1 and the light guide plate 7 of the edge light type backlight unit.
It is fixed to the cabinet 9 by the frame 8.

FIG. 3 is a perspective view of a corner portion of the liquid crystal display device according to the second embodiment of the present invention. As shown in FIG. The thickness is changed so as to eliminate the gap between the glass and the diffusion plate 6 and are integrally connected.

As described above, by integrally molding the rubber spacer into a shape surrounding the display range and fixing the rubber spacer on the diffusion plate, it is possible to improve the dimensional accuracy of attaching the rubber spacer and prevent foreign substances from entering through the gap.

The diffusion plate to which the rubber spacer is fixed may be another flat plate structure for pressing the liquid crystal display panel.

Effects of the Invention As is clear from the above embodiments, according to the present invention,
The rubber spacer is fixed on the diffusion plate in a shape surrounding the liquid crystal display range, and further molded integrally into a shape that does not create a gap in the display corner, improving assembly accuracy.
It is possible to provide a liquid crystal display device that is stable and has no foreign matter entering the display unit.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a liquid crystal display device according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of the liquid crystal display device according to the same embodiment, and FIG. 3 is a liquid crystal according to a second embodiment of the present invention. FIG. 4 is an exploded perspective view of a conventional liquid crystal display device, FIG. 5 is a perspective view showing the configuration of a conventional liquid crystal display device, and FIG. 6 is a corner of the conventional liquid crystal display device. It is a perspective view of a part. 1 ... liquid crystal display panel, 2 ... liquid crystal drive circuit board, 6 ...
... Diffusion plate, 4 ... Rubber spacer.

Claims (3)

(57) [Claims] 1. A liquid crystal display panel, a liquid crystal drive circuit board,
The liquid crystal display panel and the liquid crystal drive circuit board are composed of a diffusion plate, which is a backlight component, and an elastic body disposed between the liquid crystal drive circuit board and the diffusion plate, using an anisotropic conductive adhesive. The liquid crystal display device, wherein the elastic body is connected and fixed, and the elastic body is disposed at a position for pressing a connection portion between the liquid crystal display panel and the liquid crystal drive circuit board, and is fixed to the diffusion plate. 2. The liquid crystal display device according to claim 1, wherein the elastic body surrounds the entire periphery of the display range of the liquid crystal panel and has a shape connected to one body. 3. The liquid crystal display device according to claim 1, wherein the elastic body is colored opaque black or dark black.