JPH06313891A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To enable color shade to be prevented from occurring in a display zone near a drive IC by providing the IC in a non-display zone on glass substrates clamping a liquid crystal layer as the delay zone via adhesive resin containing a spacer. CONSTITUTION:A common side glass substrate having a smaller area than a segment side glass substrate 8 is laid in such a way as faced thereto. Liquid crystal is sealed into a gap between the common side glass substrate and the segment side glass substrate 8, thereby forming a display zone. A drive IC 11 is packaged to the substrate 8. In this case, resin 13 containing a rod type spacer 16 is applied in two parallel rows and the IC 11 is placed on the resin 13. Then, constant pressure is applied thereto and the resin 13 is spread. In this state, the resin 13 is cured. As a result, an effect of shrinkage due to the curing of the resin 13 is alleviated or absorbed by the spacer 16, and a liquid crystal gap becomes free from irregularity. Also, no color shade occurs in the display zone near the drive IC 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of an external connection terminal portion of a liquid crystal display device.

[0002]

2. Description of the Related Art A COG type liquid crystal display device has been proposed as one type of liquid crystal display device. According to this liquid crystal display device,
A liquid crystal display cell structure in which two glass substrates having electrodes on the inner surface are bonded together via a liquid crystal layer, and the periphery of the liquid crystal layer is sealed with a sealing material, and one of the glass substrates is for driving. An IC is provided, the wiring terminal extending from the liquid crystal display cell is connected to the IC by wire bonding, and the IC is also connected to a flexible wiring board for an external connection terminal portion.

The above-mentioned driving IC is arranged by the process shown in FIG. In FIG. 1A, first, a resin 3 such as an epoxy resin is applied to the portion 2 of the glass substrate 1 on which the glass substrate 1 is arranged. Next, in FIG. Press with pressure to spread the resin.
After that, in the same figure (C), in an atmosphere of 120 ° C,
The process was to cure the resin.

[0004]

However, in the liquid crystal display device in which the driving IC is arranged as described above, the glass substrate 1 expands due to the step of curing the resin in an atmosphere of 120 ° C. When the resin hardens in that state and then returns to room temperature, the IC 4 and the glass substrate 1
There is a problem in that color unevenness occurs on the display surface of the liquid crystal display device due to the difference in each linear expansion coefficient.

This problem will be described with reference to FIG. 7, in which FIG. 7A is before resin curing, but FIG.
In the state after the resin is cured, the resin having a larger linear expansion coefficient than that of the glass substrate 1 is largely distorted, the glass substrate 1 is distorted accordingly, and the glass substrate 5 facing the The gap with the liquid crystal layer injected during the period was distorted, and as a result, color unevenness occurred in the display region 6 close to the IC 4.

[0006]

A liquid crystal display device of the present invention includes a spacer in a non-display area on at least one of the two glass substrates sandwiched by a liquid crystal layer serving as a display area. The driving IC is disposed through the adhesive resin.

[0007]

According to the liquid crystal display device having the above structure, the influence of shrinkage due to curing of the resin is reduced by disposing the driving IC on the glass substrate through the adhesive resin containing the spacer.
The spacers relax or absorb the liquid crystal layers so that the intervals between the liquid crystal layers do not become non-uniform, so that color unevenness does not occur in the display area near the IC.

[0008]

【Example】

(Example 1) FIG. 4 shows a COG type liquid crystal display device 7 according to this embodiment, and FIG. 5 is a sectional view of the liquid crystal display device 7 taken along line XX.

According to these figures, the glass substrate 8 is used as the segment side substrate, and the common side glass substrate 9 having a smaller area than the glass substrate 8 is arranged so as to face the glass substrate 8. The liquid crystal is sealed between the substrates 8 and 9 to form the display area 10, and the driving IC 11 is mounted on the glass substrate 8. The driving IC 11 is also connected to the electrodes of the display area 10 via the wiring 12.

In the liquid crystal display device 7 having such a structure, there is an example of mounting the driving IC 11 on the glass substrate 8 as shown in FIG. 1, FIG. 2 or FIG. Indicates. Also, in these examples,
When mounting the driving IC 11 on the glass substrate 8 via the resin, the resins 13, 14 and 15 are applied side by side, the IC 11 is placed on the resin 13, 14 and is pressed with a constant pressure.
Spread the resin 13, 14, 15 and then 120
The step of curing the resin in an atmosphere of ° C was adopted. In this example, these resins 13, 14, 1
No. 5 used "Sumicadyne SR7030 + SH23 (two-component resin)" which is an epoxy resin manufactured by Sumitomo Chemical Co., Ltd.

According to FIG. 1, the resin 13 is arranged in two rows,
Each resin 13 contains a rod-shaped spacer 16. The present inventor changes the diameter of the spacer 16 to reduce the distance a between the glass substrate 8 and the driving IC 11 to 0.
16mm, 0.26mm, 0.32mm, 0.38m
m and 0.57 mm were changed variously, and the liquid crystal display device 7 was manufactured corresponding to each of them.
Color unevenness no longer occurs in the display area close to.

According to FIG. 2, the resin 14 is arranged in two rows,
Each resin 14 contains a bead-shaped spacer 17. The present inventor changes the diameter of the spacer 17 to set the distance b between the glass substrate 8 and the driving IC 11 to
When the liquid crystal display device 7 was produced corresponding to each of 0.2 mm, 0.3 mm, and 0.4 mm, color unevenness did not occur in the display area close to the IC 11.

Further, as shown in FIG. 3, the resin 15 is arranged in five regions, and each resin 15 has a bead-shaped spacer 18, which is also used to manufacture the liquid crystal display device 7. However, in both cases, color unevenness did not occur in the display area close to the IC 11.

The present invention is not limited to the above embodiments, and various changes and improvements may be made without departing from the gist of the present invention.

[0015]

As described above, in the liquid crystal display device of the present invention, since the driving IC is arranged on the glass substrate through the adhesive resin containing the spacer, the influence of shrinkage due to the curing of the resin is exerted. However, the spacers alleviate or absorb the liquid crystal layers so that the intervals between the liquid crystal layers do not become non-uniform, so that color unevenness does not occur in the display region close to the IC, and as a result, a high quality and highly reliable liquid crystal display device is obtained. Could be provided.

In the liquid crystal display device of the present invention,
By using the adhesive resin containing the spacers, the adhesive area can be arbitrarily changed, whereby the driving IC can be arranged with a small amount of resin while maintaining an appropriate adhesive strength.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts near a driving IC of a liquid crystal display device according to an embodiment.

FIG. 2 is a perspective view of essential parts near a driving IC of the liquid crystal display device of the embodiment.

FIG. 3 is a perspective view of essential parts near a driving IC of the liquid crystal display device of the embodiment.

FIG. 4 is a plan view of the liquid crystal display device of the embodiment.

5 is a cross-sectional view taken along line XX of the liquid crystal display device of FIG.

FIG. 6 is a perspective view of essential parts near a driving IC of the liquid crystal display device of the embodiment.

FIG. 7 is a perspective view of a main part in the vicinity of a driving IC of the liquid crystal display device according to the embodiment.

[Explanation of symbols]

 7 Liquid Crystal Display Device 8, 9 Glass Substrate 11 Driving IC 13, 14, 15 Resin 16, 17, 18 Spacer

Claims (1)

[Claims] 1. A device sandwiched by a liquid crystal layer serving as a display region.
A liquid crystal display device in which a driving IC is disposed in a non-display area on at least one of the glass substrates via an adhesive resin containing a spacer.