JP2002357837A - Liquid crystal display device and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device wherein cell gaps at a pixel area, a sealing area and its peripheral area can be equalized to one another, and to provide a manufacturing method therefor. SOLUTION: The difference between the cell gaps at the pixel area, the sealing area and its peripheral are can be optionally controlled by incorporating glass fiber into a sealing material 13a without forming protrusions 5 in sealing area of a color filter substrate 1a and its peripheral area and adjusting the diameter of the glass fiber and the liquid crystal display device 31a wherein the cell gaps at the pixel area, the sealing area and its peripheral area are equalized to one another can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display device and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, in the case of a liquid crystal display device in which a cell gap is maintained by beads scattered on the surface of a substrate, the bead scattering accuracy is insufficient to respond to recent high-definition liquid crystal panels. Defects caused by the unevenness (gap unevenness due to variation in bead scattering density, light leakage due to bead aggregation) reduced the yield of panel production. Therefore, a projection is installed on the color filter substrate,
A beadless method has been proposed in which the cell gap is maintained by the protrusions. In the case of the bead scattering method, the cell gap in the seal area and the vicinity thereof is held by glass fibers mixed in the seal, but in the case of the conventional beadless method, the surface of the color filter substrate is uniformly spread. Protrusions were formed, glass fibers were not mixed in the seal, and the sealing region and its surrounding region were generally maintained in the cell gap by the protrusions like the pixel region.

[0003]

However, in the color filter, the pixel region and the seal region of the array, and in the vicinity thereof, the presence or absence of a black matrix or a color filter layer serving as a base of the projection, and the presence or absence of wiring on the array substrate overlapping the projection. ,
The film thickness is different. For this reason, when protrusions having the same height are formed in the pixel region, the seal region, and the vicinity region, a step occurs in the cell gap between the pixel region, the seal region, and the vicinity region.

An object of the present invention is to provide a liquid crystal display device capable of making the cell gaps equal in the pixel region, the seal region, and the vicinity thereof, and a method of manufacturing the same.

[0005]

According to a first aspect of the present invention, there is provided a liquid crystal display device comprising: a color filter substrate having a projection on a surface for forming a gap; an array substrate facing the color filter substrate; What is claimed is: 1. A liquid crystal display device comprising: a liquid crystal material sandwiched in a gap with an array substrate; and a sealing material for sealing the liquid crystal material. It is not formed, and the sealing material is characterized by containing glass fiber in its components.

According to a second aspect of the present invention, there is provided a liquid crystal display device comprising: a color filter substrate having a projection on a surface for forming a gap;
A method of manufacturing a liquid crystal display device, comprising: an array substrate facing the color filter substrate; a liquid crystal material sandwiched in a gap between the color filter substrate and the array substrate; and a sealant for sealing the liquid crystal material. When forming the protrusions on the surface of the color filter substrate, while preventing the formation of the protrusions in the seal region of the color filter substrate and the vicinity thereof, at least one of the color filter substrate and the array substrate On the other hand, when the sealing material is formed in a predetermined pattern, a glass fiber is included in a component of the sealing material.

According to the present invention, a projection is not formed in a sealing region of a color filter substrate and a region in the vicinity thereof, and a glass fiber is included in a sealing material, thereby controlling a diameter of the glass fiber to control a pixel region. , The cell gap can be made equal in both the seal region and the vicinity region.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid crystal display device according to an embodiment of the present invention and a conventional liquid crystal display device to be compared with the present invention will be described with reference to FIGS. A liquid crystal display device according to an embodiment of the present invention is shown in a cross-sectional view of FIG.
Is shown in the cross-sectional views of FIGS. 3B and 3C.

FIG. 1A is a schematic cross-sectional view of a color filter substrate according to an embodiment of the present invention, and FIG.
Is a schematic view of the plane.

First, six color filter substrates (a, b, c, d, e, f) were prepared according to the following procedure.

As shown in FIG. 2 (a), after a resist film is applied by spin coating on a glass substrate 2a having a chromium film deposited on the entire surface, exposure, development, chromium etching, and resist peeling are performed to obtain a required pattern shape. The black matrix film (light shielding film) 4 made of chromium is patterned.

Next, as shown in FIGS. 2B and 2C,
Each of the RGB colored films 6 (6R, 6G, 6B) is applied,
After sequentially forming a predetermined pattern by exposure and development, an ITO transparent electrode 10 is formed thereon by sputtering.

Finally, after forming resist films for forming protrusions on five of the six color filter substrates a, b, c, d, and e, exposure and development are performed to form protrusions 5. I do. Here, as shown in FIGS. 3A, 3B, and 3C, regarding the color filter substrate 1a (a, b, c, d), the region where the protrusion 5 is formed is based on the pixel according to the embodiment of the present invention. It is an area (panel display area 7a: FIG. 1), and is not formed in the seal area and its surrounding area 17a (FIG. 1). Regarding the color filter substrate 1b (e) to be compared, the regions where the protrusions 5 are formed are the pixel region, the seal region, and the vicinity region. The height of the projections 5 was 3.9 μm for both the color filter substrates 1a and 1b. Further, no projection is formed on the color filter substrate 1c (f) to be compared.

A liquid crystal display according to the embodiment of the present invention shown in FIG. 3A will be described. When manufacturing the liquid crystal display device 31a, first, the color filter substrate 1a (a,
b, c, d) Array substrate 1 formed by a general method
Alignment films 9a and 9b are formed on the surface facing 1a, respectively. Next, after forming a sealing material 13a in which glass fibers are mixed in a predetermined pattern on the color filter substrate 1a, the substrates 1a and 11a are attached to each other at 150 ° C.
The sealing material was cured in 3 hours, and an empty cell was created. Further, after filling the liquid crystal material 14 by a vacuum injection method, the injection port was sealed to produce a liquid crystal display device 31a. At the time of assembling the device, the glass fiber diameter (4.0, 4.5, 5.0,
5.5 μm) was set as shown in Table 1 below.

Here, the liquid crystal display devices 31b and 31c shown in FIGS. 3B and 3C to be compared will be described. First, the liquid crystal display device 31b having the color filter substrate 1b (e) will be described. When the liquid crystal display device 31b is manufactured, opposing surfaces of the color filter substrate 1b in which the projections 5 are formed in the pixel region, the seal region, and the vicinity thereof and the array substrate 11b formed by a general method are used. The alignment films 9a and 9b are formed respectively. Next, after forming a sealing material 13b containing no glass fiber in a predetermined pattern on the color filter substrate 1b,
b and 11b were bonded together, and the sealing material was cured at 150 ° C. × 3 hours to form empty cells. Further, after filling the liquid crystal material 14 by a vacuum injection method, the injection port was sealed to produce a liquid crystal display device 31b.

Next, a liquid crystal display 31c having a color filter substrate 1c (f) and manufactured by a bead scattering method will be described. When the liquid crystal display device 31c is manufactured, the alignment films 9a and 9 are formed on the surfaces of the color filter substrate 1c and the array substrate 11b formed by a general method.
b is formed. Next, the color filter substrate 1c
4.2 μm diameter beads were sprayed on the pixel area of
200 pieces / mm ² ).
Sealing material 13a mixed with glass fiber of 2 μm diameter
And the gap is filled with the liquid crystal 14, whereby the liquid crystal display device 31c is manufactured.

Note that these liquid crystal display devices (31a, 3a
1b, 31c) were mounted and modularized for inspection for light leakage and the like.

These liquid crystal display devices (31a, 31b,
For 31c), the cell gap was measured. The results are shown in Table 1 together with the cell preparation conditions.

[0019]

[Table 1]

As shown in Table 1, it is found that the cell gap can be made uniform by adjusting the diameter of the glass fiber in the sealing material in the liquid crystal display device 31a. On the other hand, with respect to the liquid crystal display device 31b in which glass fiber is not mixed in the sealing material, the cell gap in the sealing region and the region in the vicinity thereof is different from the protrusion 5 of the color filter substrate 1b (e).
Is different from the cell gap in the pixel area, and the uniformity in the vicinity of the seal is insufficient even in the visual result. Regarding the liquid crystal display device 31c, the cell gap is uniform, but since a large number of beads are present in the display region, light leakage due to the beads not seen in the liquid crystal display devices 31a and 31b is observed.

As described above, according to the present embodiment, the glass fiber is included in the seal 13a material without forming the projections 5 in the seal area and the vicinity area of the color filter substrate 1a. By adjusting the diameter, it is possible to arbitrarily control the difference in the cell gap between the pixel region, the seal region, and the vicinity region, and it is possible to equalize the cell gap in the pixel region, the seal region, and the vicinity region, A liquid crystal display device with a uniform cell gap and high display quality can be realized.

[0022]

As described above, according to the present invention, a glass fiber is included in a sealing material without forming a projection in a sealing region of a color filter substrate and a region in the vicinity thereof. By controlling, the cell gap can be equalized in the pixel region, the seal region and the vicinity region, and a liquid crystal display device having a uniform cell gap and high display quality can be realized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view and a plan view of a color filter substrate according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a color filter substrate according to an embodiment of the present invention for each manufacturing process.

FIG. 3A is a cross-sectional view of a liquid crystal display device according to an embodiment of the present invention, and FIGS. 3B and 3C are cross-sectional views of a liquid crystal display device to be compared.

[Explanation of symbols]

 1a, 1b, 1c Color filter substrate 2a, 2b Glass substrate 3 Switching active element 4 Black matrix film 5 Projection 6 Colored film 7a Panel display area 8 Pixel electrode 9a, 9b Alignment film 10 Transparent electrode 11a, 11b, 11c Array substrate 13a Glass Sealing material with mixed fibers 13b Sealing material without mixed glass fibers 14 Liquid crystal 15 Beads 16 Alignment mark 17a Sealing area and its surrounding area 31a, 31b, 31c Liquid crystal display

Continued on the front page (72) Inventor Yoshinori Yamamoto 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Jiro Jojiro 1006 Oji Kadoma Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.F-term ( Reference) 2H089 LA07 LA08 NA05 NA06 NA12 NA17 NA39 QA14 TA12 2H091 FA02Y FA35Y GA06 GA08 GA09 GA13 LA17 LA19

Claims (2)

[Claims] A color filter substrate having a projection for forming a gap on a surface thereof; an array substrate facing the color filter substrate; a liquid crystal material sandwiched in a gap between the color filter substrate and the array substrate; What is claimed is: 1. A liquid crystal display device comprising: a sealing material for sealing a liquid crystal material, wherein a projection is not formed in a sealing region of the color filter substrate and a region in the vicinity thereof, and the sealing material includes glass fiber in its component. A liquid crystal display device comprising: 2. A color filter substrate having a projection for forming a gap on a surface, an array substrate facing the color filter substrate, a liquid crystal material sandwiched in a gap between the color filter substrate and the array substrate, A method for manufacturing a liquid crystal display device, comprising: a sealing material for sealing a liquid crystal material, wherein when forming the protrusions on a surface of the color filter substrate, a sealing region of the color filter substrate and a region in the vicinity thereof are provided. While not forming a projection, at least one of the color filter substrate and the array substrate, when forming the sealing material in a predetermined pattern, a glass fiber is included in the component of the sealing material. Of manufacturing a liquid crystal display device.