JPH10268278A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable enhancing rationality and also capable of reducing gap variations. SOLUTION: This device is a liquid crystal display device 20 in which a driving substrate 21 on the peripheral part of which a peripheral circuit part 6 is formed and a counter substrate 24 are overlapped with a sealing part 23 and a liquid crystal layer 25 is formed between them. On the driving substrate 21, a dummy layer 22 having the same height as that of the peripheral circuit part 6 is formed at the outer side of the peripheral circuit part 6. The sealing part 23 is provided by being made to straddle over the dummy layer 22 and the peripheral circuit part 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device in which a driving substrate and a counter substrate are overlapped via a seal portion, and a liquid crystal layer is formed between these substrates.

[0002]

2. Description of the Related Art Conventionally, in this type of liquid crystal display device, an effective pixel portion 2 is formed and arranged on a driving substrate 1 as shown in FIG. 2, a horizontal drive circuit section 3, a vertical drive circuit section 4,
4. A peripheral circuit section 6 including a uniformity improvement circuit section 5 is formed and arranged. In the driving substrate 1 of such a liquid crystal display device, a peripheral guard ring portion 7 is formed outside the peripheral circuit portion 6.

The peripheral guard ring portion 7 is made of an Al film formed simultaneously with the formation of the wiring and the like in the peripheral circuit portion 6 and is formed in a rectangular frame shape around four circumferences of the peripheral circuit portion 6. is there. Here, the peripheral guard ring portion 7 equalizes the potential of the driving substrate 1 and the entire liquid crystal display device (not shown) in which an opposing substrate (not shown) is superimposed on the driving substrate 1, thereby causing electrostatic damage. It is for preventing. On the peripheral guard ring portion 7, that is, outside the peripheral circuit portion 6, a seal portion 8 formed by applying and curing a sealant is provided. And a liquid crystal layer (not shown) formed by injecting a liquid crystal into the interior surrounded by the seal portion 8. In addition, an injection port 8a for injecting liquid crystal is formed in a part of the seal portion 8, and after injection of the liquid crystal, the injection port 8a is sealed.

However, in a liquid crystal display device having such a driving substrate 1, the seal portion 8 is attached to the peripheral circuit portion 6.
For the convenience of disposition outside the peripheral circuit portion, a space corresponding to the width of the seal portion 8 required outside the peripheral circuit portion 6 is required, and the space for this space is widened and the balance is reduced. .

[0005] As a liquid crystal display device in which such disadvantages are improved to improve the profitability, a liquid crystal display device having the structure shown in FIGS. 4A and 4B has been proposed. This liquid crystal display device is different from the liquid crystal display device shown in FIG. 3 in that, as shown in FIG. 4A, a peripheral guard ring portion 11 disposed outside a peripheral circuit portion 6 in a driving substrate 10 thereof. The width is formed narrower than the peripheral guard ring portion 7 shown in FIG. 3, and the seal portion 12 is disposed so as to straddle the peripheral guard ring portion 11 and a part of the peripheral circuit portion 6. It is. And
With this configuration, the liquid crystal display device requires a smaller space outside the peripheral circuit section 6 than that shown in FIG.

[0006]

However, FIG.
In the liquid crystal display device shown in (a) and (b), FIG.
As shown in (b), since the seal portion 12 is formed over the peripheral guard ring portion 11 and the peripheral circuit portion having different heights, the height of the peripheral guard ring portion 11 and the peripheral circuit portion is different. It is difficult to accurately control the gap between the driving substrate 10 and the counter substrate 13 due to the difference in height. And the gap control is difficult like this,
As a result, gap unevenness occurs as shown in FIG. 4B, so that color unevenness and contrast unevenness during light transmission occur.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a liquid crystal display device which can improve the balance and reduce gap unevenness.

[0008]

In the liquid crystal display device of the present invention, a driving substrate having a peripheral circuit portion formed in a peripheral portion and an opposing substrate are overlapped via a seal portion, and a liquid crystal layer is formed between these substrates. A dummy layer having substantially the same height as the peripheral circuit portion is formed outside the peripheral circuit portion on the driving substrate, and the seal portion is formed on the dummy layer and the peripheral circuit portion. Is provided as a means for solving the above-mentioned problem.

Preferably, the dummy layer is formed to include a peripheral guard ring formed outside the peripheral circuit section, and the seal section is formed between the dummy layer and the peripheral circuit section. Preferably, it is provided so as to substantially cover the entire upper surface.

According to this liquid crystal display device, a dummy layer having substantially the same height as the peripheral circuit portion is formed on the driving substrate outside the peripheral circuit portion, and the seal portion is formed between the dummy layer and the peripheral layer. Since it is provided over the circuit portion, the gap between the driving substrate and the opposing substrate provided on the driving substrate via the seal portion is formed between the dummy layer and the peripheral circuit portion. Since there is no difference in height and no unevenness due to this difference in height occurs, uniform formation is achieved with high precision.

Further, if the dummy layer is formed so as to include a peripheral guard ring portion formed outside the peripheral circuit portion, a seal portion is formed over the dummy layer and the peripheral circuit portion. As a result, the space required outside the peripheral circuit portion is only the space for the dummy layer including the peripheral guard ring portion, so that it is possible to improve the cost. Further, if the seal portion is provided so as to substantially cover the entire upper surface of the dummy layer and the peripheral circuit portion, the width of the seal portion is sufficiently widened, thereby improving the moisture resistance and vibration resistance of the liquid crystal display device.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid crystal display device of the present invention will be described in detail. FIGS. 1A and 1B are views showing a first embodiment of the liquid crystal display device of the present invention. In FIG. 1, reference numeral 20 denotes a liquid crystal display device, and reference numeral 21 denotes a driving substrate. FIG.
The liquid crystal display device 20 shown in FIGS.
The difference from the liquid crystal display device shown in FIGS. 4A and 4B is that the peripheral guard ring 11 shown in FIGS.
Is that a dummy layer 22 is formed as shown in FIGS. 1 (a) and 1 (b).

That is, in the liquid crystal display device 20 shown in FIGS. 1A and 1B, a dummy layer 22 is formed on the driving substrate 21 outside the peripheral circuit section 6. The dummy layer 22 has the same size and shape as the peripheral guard ring 11 shown in FIG. 4A when viewed in a plan view as shown in FIG. It is formed at the same height as the peripheral circuit section 6 as shown in FIG.

Here, the dummy layer 22 is formed so as to include the peripheral guard ring portion 11 shown in FIG. 4, and is formed simultaneously with the formation of the wiring and the like in the peripheral circuit portion 6.
The film is formed by laminating various films formed at the same time as the formation of various films in the peripheral circuit section 6, for example, the formation of a polysilicon film, an insulating film, a light shielding Ti film, and the like. Therefore, the dummy layer 22 has the same function as the peripheral guard ring portion 11 shown in FIG.
That is, the liquid crystal display device 20 has the function of making the entire liquid crystal display device 20 the same potential and preventing electrostatic damage.

In the liquid crystal display device 20,
As shown in FIG. 1B, the seal portion 23 is provided over the dummy layer 22 and the peripheral circuit portion 6,
The counter substrate 24 is overlapped via the seal portion 23,
Further, a liquid crystal layer 25 is formed in the seal portion 23 between the driving substrate 21 and the counter substrate 24.

Therefore, in the liquid crystal display device 20 having such a configuration, the dummy layer 22 is formed including the peripheral guard ring portion (not shown) formed outside the peripheral circuit portion 11. , The seal portion 23 is formed on the dummy layer 22.
And the peripheral circuit portion 11, the only space required outside the peripheral circuit portion 6 is the space of the dummy layer 22 including the peripheral guard ring portion. Can be achieved.

The dummy layer 22 is formed at substantially the same height as the peripheral circuit section 6, and the seal section 23 is provided over the dummy layer 22 and the peripheral circuit section 6. Therefore, the seal portion 23 is formed to have a uniform thickness on the dummy layer 22 and the peripheral circuit portion 6, so that the gap between the driving substrate 21 and the opposing substrate 24 is uniformly formed. Therefore, in this liquid crystal display device 20,
Color unevenness and contrast unevenness during light transmission are reduced, resulting in high display quality.

FIGS. 2A and 2B are views showing a second embodiment of the liquid crystal display device of the present invention. In FIG. 2, reference numeral 30 denotes a liquid crystal display device, and 31 denotes a driving substrate. FIG.
The liquid crystal display device 30 shown in FIGS.
The difference from the liquid crystal display device 20 shown in (a) and (b) is that the seal portion 32 is formed wide.
That is, the liquid crystal display device 3 shown in FIGS.
At 0, the seal portion 32 is provided so as to substantially cover the entire upper surfaces of the dummy layer 22 and the peripheral circuit portion 6, and therefore, the inner edge thereof is almost located on the outer peripheral edge of the effective pixel portion 2.

In the liquid crystal display device 30 having such a configuration, as in the case of the first embodiment, it is possible to improve the profitability, and eliminate the gap unevenness to obtain high display quality. And the sealing portion 32
, The seal strength is increased, and the moisture resistance and vibration resistance of the liquid crystal display device 30 can be improved.

[0020]

As described above, in the liquid crystal display device of the present invention, a dummy layer having substantially the same height as the peripheral circuit portion is formed outside the peripheral circuit portion on the driving substrate, and the seal portion is formed. The gap between the driving substrate and the opposing substrate is accurately and uniformly formed over the dummy layer and the peripheral circuit portion, so that color unevenness and contrast during light transmission are reduced. Unevenness and the like are reduced, so that high display quality is obtained.

Further, if the dummy layer is formed to include a peripheral guard ring portion formed outside the peripheral circuit portion, a seal portion is formed over the dummy layer and the peripheral circuit portion. Thus, the space required outside the peripheral circuit portion is only the space for the dummy layer including the peripheral guard ring portion, and therefore, it is possible to improve the cost. Further, when the seal portion is provided so as to substantially cover the entire upper surface of the dummy layer and the peripheral circuit portion, the width of the seal portion is sufficiently widened, thereby improving the moisture resistance and vibration resistance of the liquid crystal display device. Can be.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a first embodiment of a liquid crystal display device of the present invention, wherein (a) is a plan view of a driving substrate,
(B) is a side sectional view of the liquid crystal display device.

FIG. 2 is a diagram showing a schematic configuration of a liquid crystal display device according to a second embodiment of the present invention, wherein (a) is a plan view of a driving substrate,
(B) is a side sectional view of the liquid crystal display device.

FIG. 3 is a plan view of a driving substrate for explaining a schematic configuration of an example of a conventional liquid crystal display device.

4A and 4B are diagrams showing a schematic configuration of another example of a conventional liquid crystal display device, wherein FIG. 4A is a plan view of a driving substrate, and FIG. 4B is a side sectional view of the liquid crystal display device.

[Explanation of symbols]

6 Peripheral circuits 20, 30 Liquid crystal display 2
DESCRIPTION OF SYMBOLS 1, 31 Driving substrate 22 Dummy layer 23, 32 Seal part 24 Counter substrate 25 Liquid crystal layer

Claims (3)

[Claims] 1. A liquid crystal display device in which a driving substrate having a peripheral circuit portion formed in a peripheral portion and an opposing substrate are overlapped via a seal portion, and a liquid crystal layer is formed between these substrates. A dummy layer having substantially the same height as the peripheral circuit portion is formed outside the peripheral circuit portion, and the seal portion is provided over the dummy layer and the peripheral circuit portion. A liquid crystal display device. 2. The liquid crystal display device according to claim 1, wherein the dummy layer includes a peripheral guard ring formed outside the peripheral circuit. 3. The liquid crystal display device according to claim 1, wherein the seal portion is provided so as to substantially cover the entire upper surface of the dummy layer and the peripheral circuit portion.