JPH1172795A - Liquid crystal element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deformation of the shape of a sealing material and to obtain a liquid crystal element of a lower cost with higher quality by having a sealing material deformation preventive line formed of an insulating film thinner than the sealing material on the outer side of the sealing material. SOLUTION: The height of the sealing material deformation preventive line 4 is set the same as a cell gap formed by sticking two sheets of substrates 1, 1' to each other or at a height below the same. The sealing material 2 is crushed and deformed by being held between both substrates but since the deformation preventive line 4 exists, the sealing material remains on the inner side of the deformation preventive line 4 without flowing out to an external take-out electrode 3 side. Since the outflow of the sealing material 2 beyond the substrate scribing line 9 in a later stage is thereby averted, the division by scribing may be executed in a good state. In addition, the surface contamination of the external take-out electrode 3 does not arise either. The occurrence of defects in the production stage of the liquid crystal element is prevented by forming the shape of the sealing material 2 to the high accuracy in such a manner. In addition, the degree of freedom in panel design may be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a liquid crystal element formed by bonding two substrates with a sealant.

[0002]

2. Description of the Related Art In a conventional method of manufacturing a liquid crystal panel, a sealing material is drawn in a line shape around a display area of two liquid crystal element substrates, and the sealing material is cured by bonding. After scribing the outer peripheral part, the unnecessary part is removed by division to form a single liquid crystal element.

[0003]

However, in the above-mentioned conventional method, in the step of curing the sealing material drawn around the display area, the sealing material is crushed and spread by the pressure and temperature at the time of bonding the substrates. And the like.

FIG. 7 is an enlarged sectional view of the vicinity of a sealing material of a liquid crystal element formed by a conventional method. In the figure, substrates 11 and 11a are bonded together by a sealing material 2a. The tip 2b of the sealing material crushed by the bonding is deformed and spreads to the external extraction electrode 3 on the substrate 11.

[0005] The deformed seal material easily flows along irregularities such as a wiring pattern on the substrate, so that the seal material reaches the unnecessary substrate portion beyond the substrate dividing scribe line 9. In this case, when the substrate is divided,
Are difficult to be divided because they are adhered by a sealing material, and defects such as chipping of the substrate material are liable to occur after the division. Further, the deformation of the sealing material tends to form voids such as air bubbles in the cured sealing material, and these voids may cause a failure during liquid crystal injection.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and prevents the deformation of the shape of the sealing material and increases the accuracy of the shape of the sealing material, thereby preventing the sealing material from protruding. It is an object of the present invention to provide a liquid crystal element in which a substrate division failure and a liquid crystal injection failure are prevented.

[0007]

That is, the present invention provides a liquid crystal element formed by bonding a pair of substrates to each other with a sealing material provided in the vicinity of the outer periphery of the substrates. A liquid crystal element having a sealing material deformation preventing line formed of an insulating film, which is thinner than the sealing material.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A liquid crystal device according to the present invention is a liquid crystal device formed by bonding a pair of substrates to each other with a sealing material provided in the vicinity of the outer periphery of the substrates. A sealing material deformation preventing line formed of an insulating film, which is thinner than the material, is provided.

The present invention is characterized in that a line for preventing the flow of the sealing material is provided on the outer periphery of the sealing material for bonding the two liquid crystal element substrates. The sealing material to which pressure is applied at the time of bonding the substrates is crushed and spread between the substrates. It can be prevented from flowing out. Therefore, when the substrate is divided, the unnecessary part of the substrate is easily divided, and the external extraction electrode can be used in a normal state.

In the present invention, electrical connection is made between the two opposing substrates. Preferably, the sealing material deformation preventing line is formed by printing an insulating film, and the insulating film is formed simultaneously with the same material as the short-circuit preventing insulating film in the cell. The sealing material deformation preventing line may be provided on one or both of the pair of substrates.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

Embodiment 1 FIGS. 1 and 2 are developed views showing a first embodiment of the liquid crystal device of the present invention. 1 and 2 show a liquid crystal element substrate A, respectively.
(Development views of (common electrode substrate) and B (segment electrode substrate) are shown, and the illustrated surfaces are the surfaces facing each other.

An external electrode 3 and a display area 5 are provided on the substrate Al, and an external electrode 3 'and a display area 5' are provided on the substrate B1 '. It is desirable that at least one of the display areas 5 and 5 'has a color filter and a light-shielding film layer.

Here, a sealing material deformation preventing line 4 is provided on the substrate Al, and a sealing material deformation preventing line 4 'is provided on the substrate B1', and interferes with the external extraction electrodes 3 and 3 'of the same substrate. Not formed.

In this embodiment, the example of forming the sealing material deformation preventing line is shown using the same insulating film as the short-circuit preventing organic insulating film formed on the liquid crystal element substrate. The insulating film is formed using a coating type organic film material such as polyimide or polyvinyl alcohol by a printing method, a transfer method, or the like. By forming the insulating film for preventing short-circuit and the insulating film of the sealing material deformation preventing line at the same time by a printing method, a transfer method, etc., pressure is not concentrated on the end of the insulating film of the sealing material deformation preventing line, There is also an effect that the pattern property is improved.
Alternatively, it may be formed by printing a plurality of times.

The sealing material for bonding is drawn on at least one of the two substrates on the display area side from the sealing material deformation preventing line. 1 and 2 show a state in which the sealing material 2 and the sealing material 2 'are drawn on the substrate Al and the substrate B1. The sealing material is substrate A
(Common electrode substrate) or substrate B (segment electrode substrate) may be drawn.

The sealing material 2 is made of epoxy, acrylic,
A liquid resin material such as urethane is used. A cell gap material may be mixed and used in the sealing material. In addition, as a drawing method of the sealing material, dispenser application, printing,
There are methods such as transfer, and in any case, drawing is performed in a desired shape. Thereafter, the two substrates are bonded to face each other, and in this state, the sealing material is cured using a curing method such as room temperature curing, heat curing, or light curing to complete the lamination of the substrates.

FIG. 3 is an enlarged cross-sectional view of the vicinity of the sealing material of the liquid crystal element in which the substrate having the sealing material deformation preventing line of the present invention is bonded. The height of the sealing material deformation preventing line 4 must be equal to or less than the cell gap formed by bonding two substrates.

The sealing material 2 is sandwiched between the two substrates and crushed,
Although it is deformed, it stays inside the seal material deformation preventing line 4 without flowing out to the external extraction electrode 3 side due to the presence of the seal material deformation preventing line 4. For this reason,
Since the sealing material 2 does not flow out over the substrate scribe line 9 in the subsequent process, the scribe division can be performed in a favorable state. Further, the surface of the external extraction electrode 3 is not contaminated. Reference numeral 7 denotes an insulating film for preventing short circuit.

Embodiment 2 FIG. 4 is a sectional view showing a second embodiment of the liquid crystal device of the present invention. In this embodiment, the insulating film material is SiO 2
_{2. After} forming an inorganic thin film such as SiN by sputtering or CVD, or forming a coating type film by roll coating, spin coating, printing or the like,
By patterning using a dry etching method such as E or a wet etching method such as a photo etching method, a sealing material deformation preventing line having a desired position and shape is formed. It is also possible to form a plurality of layers by combining the two. Also in this embodiment, the first embodiment
The same effect as described above can be obtained.

Embodiment 3 FIG. 5 is a sectional view showing a third embodiment of the liquid crystal device of the present invention. In the drawing, 1 and 1 ′ are opposing substrates, 2 is a sealing material, 13 is a conductive resin, 4 is a sealing material deformation preventing line,
Reference numerals 14 and 14 'indicate conductive film layers.

The material of the conductive resin 13 is Ag, N
Particles such as i, Ti, Pb-Sn metal particles, resin such as epoxy, urethane or the like coated with a metal film such as Au, Pt, Sn or inorganic particles such as SiO ₂ are resin materials having these particles themselves. But it is good.

The upper and lower substrates are electrically connected by a conductive resin 13. Here, it is prevented that the conductive resin 13 is pushed out from a desired position toward the outer periphery of the substrate due to the deformation of the sealing material 2 at the time of bonding the substrates, so that electrical connection becomes impossible. Embodiment 4 FIG. 6 is a schematic view showing an embodiment of a large-area liquid crystal element. FIG. 6 has a plurality of electrical connection points between the substrates by the conductive resin 13. In electrical connection between substrates in a large-area panel, a difference occurs in the potential difference between the two substrates between the vicinity of the connection point and a position apart from the connection point.
Therefore, a plurality of connection points are provided to prevent generation of a potential difference. FIG. 6 shows an example in which conductive resin 13 is provided at the four corners around the substrate and at the center of the display area.

As shown in this figure, when an electrical connection point must be provided also in the display area of the panel, the flow of the conductive resin 13 significantly impairs the display state of the liquid crystal element. However, as shown in the figure, if the seal material deformation preventing line 4 is used, a large number of electrical connection points can be formed at any point in the liquid crystal element and at the same time without affecting the display pixels. it can.

[0025]

As described above, according to the present invention,
By preventing the deformation of the shape of the sealing material and making the shape of the sealing material highly accurate, it prevents the failure of the substrate to split and the failure of the liquid crystal injection due to the protrusion of the sealing material, thereby preventing the occurrence of defects in the liquid crystal element manufacturing process. In addition, by increasing the degree of freedom in panel design, it is possible to provide a higher quality and lower cost liquid crystal element.

[Brief description of the drawings]

FIG. 1 is a developed view showing a part of a first embodiment of a liquid crystal element of the present invention.

FIG. 2 is a developed view showing a part of the first embodiment of the liquid crystal element of the present invention.

FIG. 3 is an enlarged cross-sectional view showing the vicinity of a sealing material of a liquid crystal element to which a substrate having a sealing material deformation preventing line of the present invention is attached.

FIG. 4 is a sectional view showing a second embodiment of the liquid crystal element of the present invention.

FIG. 5 is a sectional view showing a third embodiment of the liquid crystal element of the present invention.

FIG. 6 is a schematic view showing an embodiment of a large-area liquid crystal element of the present invention.

FIG. 7 is an enlarged cross-sectional view near a sealing material of a liquid crystal element formed by a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate A 1 'Substrate B 2, 2' Sealing material 2a Sealing material 2b Tip of sealing material 3, 3 'External take-out electrode 4 Sealing material deformation prevention line 5, 5' Display area 7 Short-circuit prevention insulating film 9 Substrate division Scribe line 10 Substrate unnecessary portion 11, 11a Substrate 13 Conductive resin 14, 14 'Conductive film layer

Claims (5)

[Claims] 1. A liquid crystal element formed by a pair of substrates opposed to each other and bonded by a sealant provided in the vicinity of the outer periphery of the substrates, and formed by an insulating film thinner than the sealant outside the sealant. A liquid crystal element comprising a sealed sealing material deformation prevention line. 2. The liquid crystal device according to claim 1, further comprising an electrical connection between the two substrates facing each other. 3. The liquid crystal device according to claim 1, wherein the sealing material deformation preventing line is formed by printing an insulating film. 4. The liquid crystal device according to claim 1, wherein the insulating film is formed simultaneously with the same material as the insulating film for preventing short circuit in the cell. 5. The liquid crystal device according to claim 1, wherein the sealing material deformation preventing line is provided on both of the pair of substrates.