JP2003287760A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve display unevenness due to infiltration of a sealant for sealing a liquid crystal into a display area in the first place and to enhance dividing accuracy by suppressing infiltration of the sealant for sealing the liquid crystal onto a dividing line in the second place, in a liquid crystal display device used for a display instrument. <P>SOLUTION: In at least one organic film formed on at least one of a liquid crystal driving substrate 1 and a counter substrate 2, areas having no organic film are provided on the periphery of the substrates, at distances of 0.5 mm from the both end surfaces in the width direction of the sealant 5 for sealing the liquid crystal, to form steps by the difference of the thickness of the organic film. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a liquid crystal display device.

[0002]

2. Description of the Related Art Recently, a liquid crystal display device having a screen display has been widely used as a display device for AV / OA equipment products and the like. It is necessary to reduce the size and size of the liquid crystal drive substrate and the counter substrate, the liquid crystal display panel assembly, the circuit mounting, the housing, and the module design.

FIG. 1 is a sectional view of a liquid crystal display device, in which a liquid crystal driving substrate 1 and a counter substrate 2 are attached to each other with an alignment film 3 interposed therebetween, and a liquid crystal sealing seal is provided on the inner surface of the liquid crystal driving substrate 1 or the counter substrate. After applying the agent 5, the liquid crystal 4 is injected and sealed with the liquid crystal sealant 6. 2 is a plan view of the liquid crystal display device, and FIG. 4 is a sectional view taken along the line aa ′ in FIG. 2 of the conventional liquid crystal display device.

[0004]

FIG. 2 shows a plan view of a liquid crystal display device. However, the distance between the end face in the longitudinal direction of the liquid crystal display device and the display area A has been increased due to the recent demand for miniaturization and compactness. The design is such that b is small. When such a design is made, the accuracy of the formation position and the formation width of the liquid crystal sealing sealant 5 is deteriorated due to the influence of the conditions when the liquid crystal sealing sealant 5 is formed. Agent 5
Causes unevenness in display due to excessively entering the inside of the display area.

Second, when a plurality of liquid crystal sealing materials 5 are formed on the inner surfaces of the liquid crystal driving substrate 1 and the counter substrate 2, and then the liquid crystal driving substrate 1 and the counter substrate 2 are divided into a predetermined size,
If the liquid crystal sealing agent 5 is present on the dividing line, the cross section becomes an uneven surface and the outer shape accuracy of the liquid crystal display device deteriorates. Therefore, it is necessary to make the outer size tolerance of the liquid crystal display device large.
This is an obstacle to downsizing and compacting.

[0006]

In order to solve the above problems, as shown in FIG. 3, at least one kind of organic film formed on at least one of the liquid crystal drive substrate 1 and the counter substrate 2 is sealed with a liquid crystal. Do not form in a region within at least 0.5 mm from the end face in the width direction of the stop sealing agent 5 and suppress the occurrence of display unevenness by forming a step due to the thickness of the organic film, and reduce the outer dimension tolerance. You can

By providing the step, the patterned sealant 5 for sealing the liquid crystal is crushed when the liquid crystal drive substrate 1 and the counter substrate 2 are bonded together, and the sealant 5 for sealing the liquid crystal 5 is crushed.
Although it spreads in the width direction, the area of the sealant 5 for liquid crystal sealing in the spreading direction can be increased by the step and the spread of the sealant 5 for liquid crystal sealing can be suppressed. It is possible to reduce the variation in the width of the agent 5. Therefore, it is possible to prevent the occurrence of display unevenness due to the liquid crystal sealing sealant 5 entering the inside of the display area more than necessary.

Further, when a plurality of liquid crystal sealing materials 5 are formed on the inner surfaces of the liquid crystal drive substrate 1 and the counter substrate 2 and then the liquid crystal drive substrate 1 and the counter substrate 2 are divided into a predetermined size, the liquid crystal is sealed. It is possible to prevent the stop sealing agent 5 from spreading in the width direction thereof, and when the liquid crystal sealing sealing agent 5 is present on the dividing line, the dividing surface becomes an uneven surface and the external accuracy of the liquid crystal display device is deteriorated. As a result, it is possible to reduce the outer dimensional tolerance of the liquid crystal display device.

The organic film provided with the region without the organic film on the liquid crystal drive substrate 1 and the counter substrate 2 enables improvement of display unevenness and reduction of outer dimension tolerance without increasing the number of manufacturing steps of the liquid crystal display device more than necessary. Therefore, the organic film formed on the liquid crystal drive substrate 1 or the counter substrate 2 at the time of manufacturing the liquid crystal display device is desirable. Specifically, as the organic film forming the step, the protective film 8 and the alignment film 3 are mentioned as the organic films used for both the liquid crystal drive substrate 1 and the counter substrate 2. Even if there is only one type of step difference in the organic film, the effect is great if the film thickness is large, but the effect can be further increased by combining two or more kinds of organic films to increase the sum of the step differences. The height of the step formed depends on the film thickness of the organic film formed on the liquid crystal drive substrate 1 or the counter substrate 2 when manufacturing the liquid crystal display device. The thickness of the protective film 8 is 0.1 μm to 20 μm. The alignment film 3 has a thickness of 0.05 μm to 0.5 μm.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is
One or more kinds of organic films are formed on at least one of the liquid crystal drive substrate and the counter substrate, and the liquid crystal drive substrate and the counter substrate are bonded together with a liquid crystal sealing sealant having a liquid crystal injection port formed between the two substrates. A liquid crystal display device obtained by injecting liquid crystal into a space between both substrates from the liquid crystal injection port, wherein an area within at least 0.5 mm from an end face in a width direction of the liquid crystal sealing material is the organic film. The liquid crystal display device is characterized in that a step due to the thickness of the organic film is provided on the substrate on which the organic film is formed by forming a non-formed region in which the organic film is not formed.

The invention according to claim 2 of the present invention is characterized in that at least 0.5 mm from the end face of the liquid crystal sealing sealant in the width direction is the non-formation region in which the organic film is not formed. The liquid crystal display device according to claim 1.

According to a third aspect of the present invention, at least 0.5 mm from the end face opposite to the end face on the display area side in the width direction of the sealant for liquid crystal sealing is defined as a non-formation region where no organic film is formed. The liquid crystal display device according to claim 1, wherein:

According to a fourth aspect of the present invention, the liquid crystal sealing sealant has a width within at least 0.5 mm from an end face of the liquid crystal sealing sealant, and the liquid crystal sealing sealant has a widthwise display area. The liquid crystal display device according to claim 1, wherein at least 0.5 mm from the end face opposite to the side end face is a non-formation region where the organic film is not formed.

The invention according to claim 5 of the present invention is the liquid crystal display device according to any one of claims 1 to 4, wherein the organic film is a protective film.

The invention according to claim 6 of the present invention is the liquid crystal display device according to any one of claims 1 to 4, wherein the organic film is an alignment film.

The invention according to claim 7 of the present invention is the liquid crystal display device according to claim 5, wherein the step formed by the protective film is 0.1 μm to 20 μm.

The invention according to claim 8 of the present invention is the liquid crystal display device according to claim 6, wherein the step formed by the alignment film is from 0.05 μm to 0.5 μm.

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 3 is a diagram for explaining (Embodiment 1) of the present invention.

Between the display area A side end face of the liquid crystal sealing sealant 5 and the display area A, and from the end face opposite to the display area A side of the liquid crystal sealing sealant 5 to the display area A.
A region where the protective film 8 is not formed in the pattern of the protective film 8 formed on the liquid crystal drive substrate 1 and the counter substrate 2 is provided on the opposite side to form a step. As a result, the step can increase the area of the liquid crystal sealing sealant 5 in the spreading direction and suppress the liquid crystal sealing sealant 5 from spreading, so that the width of the liquid crystal sealing sealant 5 varies. Can be made smaller. Therefore, the liquid crystal sealing agent 5
It is possible to suppress the occurrence of display unevenness due to the unnecessary entry into the inside of the display area.

When a plurality of liquid crystal sealing materials 5 are formed on the inner surfaces of the liquid crystal drive substrate 1 and the counter substrate 2, the liquid crystal drive substrate 1 and the counter substrate 2 are divided into a predetermined size. Since the dividing surface when the liquid crystal sealing agent 5 is present on the line becomes an uneven surface and the outer shape accuracy of the liquid crystal display device is not deteriorated, the outer size tolerance of the liquid crystal display device can be made small.

(Embodiment 2) FIG. 5 is a diagram for explaining (Embodiment 2) of the present invention.

In the pattern of the protective film 8 formed on the liquid crystal drive substrate 1 and the counter substrate 2, between the display area A side end surface of the sealant for liquid crystal sealing and the display area A, the protective film 8 is not formed. Is provided to form a step. As a result, the step can increase the area of the liquid crystal sealing sealant 5 in the spreading direction and suppress the liquid crystal sealing sealant 5 from spreading, so that the width of the liquid crystal sealing sealant 5 varies. Can be made smaller. Therefore, it is possible to prevent the occurrence of display unevenness due to the liquid crystal sealing sealant 5 entering the inside of the display area more than necessary.

In this embodiment, there is no pattern of the protective film 8 formed on the liquid crystal driving substrate 1 and the counter substrate 2 between the display area A side end surface of the liquid crystal sealing sealant and the display area A. The area is provided and the step is formed,
It goes without saying that a region having no pattern of the protective film 8 may be provided from the end surface on the side opposite to the display area A side of the liquid crystal sealing agent to the side opposite to the display area A.

[0025]

According to the present invention, at least one kind of organic film formed on at least one of the liquid crystal driving substrate and the counter substrate is provided within at least 0.5 mm from the end face in the width direction of the liquid crystal sealing agent. Since it is not formed in the region and a step due to the thickness of the organic film is formed, it is possible to suppress the occurrence of display unevenness and reduce the external dimension tolerance.

[Brief description of drawings]

FIG. 1 is a sectional view of a conventional liquid crystal display device.

FIG. 2 is a plan view of a liquid crystal display device.

FIG. 3 is a sectional view of the vicinity of a sealant 5 for sealing liquid crystal of the liquid crystal display device showing Embodiment 1 of the present invention.

FIG. 4 is a cross-sectional view of the vicinity of a sealant 5 for sealing a liquid crystal of a conventional liquid crystal display device.

FIG. 5 is a cross-sectional view of a liquid crystal display device according to a second embodiment of the present invention in the vicinity of a sealant 5 for sealing liquid crystal.

[Explanation of symbols]

1 LCD drive board 2 Counter substrate 3 Alignment film 4 liquid crystal 5 Sealant for liquid crystal sealing 6 Liquid crystal sealant 7 Liquid crystal inlet 8 protective film 9 ITO A display area

Claims (8)

[Claims] 1. A liquid crystal driving substrate and a counter substrate, wherein at least one of the substrates is formed with one or more kinds of organic films, and a liquid crystal sealing material having a liquid crystal injection port is formed between the substrates. A liquid crystal display device comprising a liquid crystal injection port and a liquid crystal injecting liquid crystal into a space between the substrates, the area being at least 0.5 mm from an end face in the width direction of the sealant for sealing liquid crystal. Is a non-formation region in which the organic film is not formed, whereby a step due to the thickness of the organic film is provided on the substrate on which the organic film is formed. 2. The liquid crystal display according to claim 1, wherein at least 0.5 mm from the end face of the liquid crystal sealing material in the width direction is the non-formation region where the organic film is not formed. apparatus. 3. The non-formation region in which the organic film is not formed is at least 0.5 mm from the end face opposite to the end face on the display area side in the width direction of the liquid crystal sealing sealant. The liquid crystal display device according to item 1. 4. A liquid crystal sealing sealant within at least 0.5 mm from a display area side end face in the width direction, and at least an end face opposite to the display area side end face in the width direction of the liquid crystal sealing sealant. The liquid crystal display device according to claim 1, wherein a region within 0.5 mm is a non-formation region in which an organic film is not formed. 5. The liquid crystal display device according to claim 1, wherein the organic film is a protective film. 6. The liquid crystal display device according to claim 1, wherein the organic film is an alignment film. 7. The step formed by the protective film is 0.1 μm.
The liquid crystal display device according to claim 5, wherein the liquid crystal display device has a thickness of m to 20 μm. 8. The step formed by the alignment film is 0.05.
The liquid crystal display device according to claim 6, wherein the liquid crystal display device has a thickness of from 0.5 μm to 0.5 μm.