JP2002244148A - Liquid crystal display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display by which the reduction of the yield can be prevented, and which can be formed into a smaller frame type. SOLUTION: At a part where a seal 23 is to be formed on a terminal part 24, barrier patterns 27a and 27b, consisting of insulating layers, are formed along the sides of the seal 23. The width of the seal 23 formed on the terminal part 24 can be maintained uniform by the barrier patterns 27a and 27b. The reduction in the product yield can be prevented, and the liquid crystal display can be formed into a narrower frame device, by using the seal 23 having a stable width shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display device having a seal for sealing a liquid crystal formed between a first substrate and a second substrate.

[0002]

2. Description of the Related Art A liquid crystal display device generally has a configuration described in, for example, Japanese Patent Application Laid-Open No. 9-199728. In Japanese Patent Application Laid-Open No. 9-199728, an array substrate and a counter substrate are opposed to each other, a sealant is applied around the array substrate and the counter substrate, and a liquid crystal is interposed between the array substrate and the counter substrate surrounded by the seal agent. There is described a liquid crystal display device formed by sandwiching.

When assembling such a liquid crystal display device, a pair of an array substrate and an opposing substrate each having an electrode film formed on one surface thereof are opposed to each other on the surface having the electrode film formed thereon. At that time, first, a sealant is applied along the periphery of the display area where the electrode film of the array substrate is formed,
An opposing substrate is arranged to oppose. In this state, the sealant is heated and cured to fix the array substrate and the counter substrate. The liquid crystal is sealed in the display area surrounded by the seal between the array substrate and the counter substrate arranged in such a manner, and the liquid crystal display device is assembled.

As shown in FIG. 4, an array substrate 11 is provided with a terminal portion 12 for external connection near a substrate end 11a which is an end portion of the array substrate 11. It has a plurality of mutually parallel conductive layers 13 formed from the region toward the substrate end 11a. Since the seal 14 is formed so as to surround the display area, the seal 14 is also formed on the terminal portion 12 in a direction crossing the conductive layer 13. A counter substrate 15 is provided to face the array substrate 11, and this counter substrate 15
The substrate end 15a, which is the end of the substrate 15, is the substrate end 11a of the array substrate 11.
The terminal portion 12 of the array substrate 11 is exposed further inside.

Here, when assembling the liquid crystal display device,
The seal 14 is formed by enlarging the width in the width direction as compared with when the sealant is applied. The width of the seal 14 needs to be large enough to maintain the strength of the liquid crystal display device. However, the seal 14 formed on the terminal portion 12 is affected by the pattern shape of the plurality of conductive layers 13 constituting the terminal portion 12, and as shown, the shape in the width direction is partially thinned, or On the contrary, the seal shape becomes thick and unstable. In particular, the thinned portion of the seal 14 causes so-called seal breakage, which may cause a reduction in yield.

Further, as a liquid crystal display device, a so-called narrower frame is required to make the width of a frame portion around a display area as narrow as possible. It is indispensable to reduce the number of seals and to design the minimum necessary seal width.

[0007]

As described above, in the conventional structure, the shape of the seal 14 surrounding the periphery of the display area between the array substrate and the counter substrate on the external connection terminal portion 12 is changed to the terminal portion.
It is not stable due to the influence of the pattern shape of the conductive layer 13 forming the layer 12, and as shown in FIG. 4, a narrow portion or a thick portion is generated, resulting in a decrease in yield and a reduction in frame width. Is difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a liquid crystal display device which can prevent a decrease in yield and can be adapted to a small frame.

[0009]

According to the present invention, there is provided a first substrate having at least one of terminal portions formed of a plurality of conductive layers toward an end portion, and a first substrate and a first substrate disposed opposite to each other. A second substrate, a seal formed along the periphery of the first substrate and the second substrate, a liquid crystal sealed between the first substrate and the second substrate surrounded by the seal; A portion where the seal is formed, and a barrier pattern formed by an insulating layer along a side of the seal, and a portion on the terminal portion where the seal is formed,
By forming a barrier pattern of an insulating layer along the side of the seal, the width of the seal formed on the terminal portion can be kept uniform by the barrier pattern, and a seal having a stable width shape is obtained. Can be prevented, and the frame can be narrowed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the liquid crystal display device of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the liquid crystal display device 20 is, for example, an active matrix type and has an array substrate 21 as a first substrate. An electrode film serving as a line and a scanning line is arranged in a grid pattern. At each intersection of the signal line and the scanning line, a pixel electrode connected to the signal line and the scanning line via a switching element such as a thin film transistor to form a display area. Are formed respectively. Also, the array substrate
An opposing substrate 22 is disposed on 21 as an opposing substrate as a second substrate,
On one surface of the counter substrate 22, a not-shown counter electrode or the like is formed. The array substrate 21 and the counter substrate 22 are arranged such that the surfaces on which the electrode films are formed face each other.

At the time of assembly, the array substrate
A sealant is applied so as to surround a display area in which the 21 pixel electrodes are arranged in a matrix, and the opposing substrate 22 is arranged to face the intervening sealant. In this state, the sealant is heated and hardened to form a seal 23 surrounding the display region with the counter substrate 22, and the array substrate 21 and the counter substrate 22 are integrally bonded. In this state, a liquid crystal is injected between the array substrate 21 and the counter substrate 22 surrounded by the seal 23 from an injection port 23a in which a part of the seal 23 is cut off, and the injection port 23a is sealed to Form a layer.

A substrate end 21 which is an end of the array substrate 21
An OLB pad 24 serving as an external connection terminal connected to the electrode film on the array substrate 21 is provided near a.
As shown in FIG. 1, the OLB pad 24 has a plurality of parallel conductive layers 25 formed from a display area (not shown) toward the substrate end 21a. Also seal
23 is formed so as to surround the display area.
It is also formed on the pad 24 in a direction crossing the conductive layer 25. The opposing substrate 22 has a substrate end 22a of the opposing substrate 22 located inside the substrate end 21a of the array substrate 21 and an OLB pad 24.
Is exposed.

Further, as shown in FIG. 3, the conductive layer 25
The electrode layer 25a and the electrode layer 25b are laminated and formed, and OL
The space of the B pad 24 is constituted by interlayer insulating films 26a and 26b. Due to such a configuration, the electrode layers 25a, 25a
An uneven portion is formed on the surface of the uppermost interlayer insulating film 26b due to the difference in film thickness between 5b and the interlayer insulating films 26a and 26b. Due to the presence of the irregularities, the sealant applied on the irregularities and heated and hardened to form the seal 23 spreads in the pad direction due to the capillary phenomenon caused by the irregularities, and the seal width is increased if nothing is done. A thin part and a thick part are generated.

For this reason, a barrier pattern of an insulating layer is formed along the side of the seal 23 on the portion of the OLB pad 24 where the seal 23 is formed, and the barrier pattern is formed on the OLB pad 24 by the barrier pattern. The width of the seal 23 is kept uniform. For example, as shown in FIG. 1, a pair of barrier patterns 27a and 27b at a predetermined interval are formed at least on a corresponding portion on the OLB pad 24 on the array substrate 21 on which the seal 23 is formed, that is, a portion along both sides of the seal 23. are doing.

When a pair of barrier patterns 27a and 27b are formed at regular intervals in this manner, the sealant applied on the array substrate 21 and cured by heating spreads in the pad direction due to the above-mentioned capillary action due to the shape of the uneven portion. Trying to
The movement is regulated by the pair of barrier patterns 27a and 27b. For this reason, the seal 23 having a uniform width is formed between the pair of barrier patterns 27a and 27b, and a trouble such as breakage of the seal does not occur, and the seal 23 having the required minimum width can be formed in a stable width shape. .

Further, in this embodiment, a pair of barrier patterns 27a and 27b are formed at portions along both sides of the seal 23, but along the inner side of the seal 23, that is, along the side of the array substrate 21 on the display area side. One barrier pattern formed on the part
Only 27a may be provided.

Even when only one barrier pattern 27a is provided in this manner, the sealant applied on the array substrate 21 and trying to spread in the pad direction due to the capillary action of the concave and convex portions is not affected by the one barrier pattern 27a. Movement is regulated. For this reason, the seal 23 having a substantially uniform width is formed along one of the barrier patterns 27a, and it is possible to prevent a problem such as a break in the seal from occurring.

Here, the array substrate 21 is provided with a color filter layer in which a plurality of insulating colored layers are sequentially arranged. The barrier patterns 27a and 27b may be formed using the insulating colored layers. .

The OLB pad 24 below the seal 23 may have a constant width and a constant spacing in order to uniformly form the width of the seal 23 formed on the OLB pad 24.

Further, the present invention can be applied to liquid crystal display devices other than the active matrix type.

[0022]

According to the present invention, a barrier pattern is formed along the side of the seal at the portion where the seal is formed on the terminal, so that the width of the seal formed on the terminal is uniform. , And with a stable width-shaped seal,
It can prevent a decrease in product yield and can cope with narrowing of the frame.

[Brief description of the drawings]

FIG. 1 is a plan view showing a part of an embodiment of a liquid crystal display device of the present invention.

FIG. 2 is a plan view showing the whole of the same.

FIG. 3 is a sectional view of the same.

FIG. 4 is a plan view showing a part of a conventional liquid crystal display device.

[Explanation of symbols]

 20 liquid crystal display device 21 array substrate 21a as a first substrate 21a substrate end as an end 22 counter substrate as a second substrate 23 seal 24 OLB pad as a terminal 25 conductive layers 27a and 27b barrier pattern

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H089 LA41 QA11 TA09 TA12 2H091 FA01Y GA13 LA11 2H092 GA40 JA24 NA25 NA29 5G435 AA17 BB12 EE09 EE33 GG12

Claims (5)

[Claims] A first substrate and a second substrate which are formed on at least one of the terminal portions formed of a plurality of conductive layers toward an end portion and are disposed to face each other; A seal formed along the periphery of the substrate and the second substrate; a liquid crystal sealed between the first substrate and the second substrate surrounded by the seal; and a portion on the terminal portion where the seal is formed And a barrier pattern formed of an insulating layer along a side of the seal. 2. The liquid crystal display device according to claim 1, wherein the barrier pattern is formed only on a portion along an inner side of the seal. 3. The liquid crystal display device according to claim 1, wherein the barrier pattern is formed at portions along both sides of the seal. 4. The barrier pattern according to claim 1, wherein the barrier pattern is formed by a coloring layer of a color filter formed on one of the first substrate and the second substrate.
The liquid crystal display device according to any one of the above. 5. The liquid crystal display device according to claim 1, wherein the terminal portion has a constant value of a width and an interval between the plurality of conductive layers.