JP3523901B2 - Color liquid crystal display panel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a color liquid crystal display panel having a color filter layer and a flattening layer on the inner surface of the liquid crystal display panel.

[0002]

2. Description of the Related Art A conventional color liquid crystal display panel has a structure in which a color filter layer and a flattening layer are provided inside a seal portion as a means for obtaining a color display.

FIG. 5 is a plan view showing a seal portion and a flattening layer of a conventional color liquid crystal display panel, and FIG. 6 is a sectional view taken along line DD of the conventional color liquid crystal display panel shown in FIG. It is sectional drawing shown. The structure of the conventional color liquid crystal display panel will be described below with reference to FIGS.

The first substrate 30 is provided with a color filter layer 13 formed on the first transparent substrate 11 by a dyeing method or a pigment dispersion method, and is made of an acrylic resin for flattening the surface of the color filter layer 13. The flattening layer 15 is formed on the entire surface of the color filter layer 13 and the first transparent substrate 11.

The first substrate 30 has a flattening layer 15 formed thereon.
A first pattern electrode 17 made of a transparent conductive film is formed on the first
Of the transparent substrate 11 up to the end surface of the transparent substrate 11 and further subjected to an alignment treatment by rubbing treatment on the first pattern electrode 17.
The alignment film 20 is formed so as to cover the inner spacer 26 of the seal.

The second substrate 31 includes a second pattern electrode 19 formed of a transparent conductive film on the second transparent substrate 12, or a metal-insulator-metal structure MI (not shown in FIG. 5).
A second pattern electrode 19 having an M element or an active element such as a thin film transistor element (TFT) is formed so as to straddle the seal inner spacer 26, and an alignment treatment is performed on the second pattern electrode 19 by a rubbing treatment. The second alignment film 21 is formed so as to straddle the inner spacer 26 of the seal.

The first method for manufacturing a color liquid crystal display panel is
Between the first substrate 30 and the second substrate 31, the panel inner spacer 23 is interposed and the seal inner spacer 26 mixes in the two first substrates 30 and the second substrate 31. It is pasted together.

The seal portion 22 is formed by a screen printing method, and the seal portion 22 is formed on the outer side of the color liquid crystal display panel apart from the color filter layer 13.

The gap between the first substrate 30 and the second substrate 31 of the color liquid crystal display panel is held by the panel inner spacer 23 and the seal inner spacer 26.

However, since the liquid crystal layer 25 on the color filter layer 13 and the liquid crystal layer 25 in the vicinity of the seal portion 22 have different thicknesses, these panel internal spacers 23 are provided.
It is necessary to properly set the spacer particle diameter between the seal inner spacer 26 and the seal inner spacer 26.

Further, the first pattern electrode 17 in the region outside the seal portion 22 of the first substrate 30 has the flattening layer 15
Since it is formed on the top surface, it has low hardness and is vulnerable to external impacts, so special care must be taken in handling in the inspection process and the IC mounting process.

[0012]

In the conventional color liquid crystal display panel structure, the color filter layer 13 can always be manufactured to have a uniform thickness due to variations in the manufacturing process. However, it may be different for each first substrate 30.
Or the particle size of the spacer 26 inside the seal must be adjusted for each first substrate 30, which causes a problem of low mass productivity.

Since it is difficult to properly select the particle size of the panel inner spacer 23 or the particle size of the seal inner spacer 26, the central part of the color liquid crystal display panel and the peripheral part near the seal part 22 are uniformly aligned. There is a problem that it becomes difficult.

Further, the first pattern electrode 17 in the area outside the seal portion 22 of the first substrate 30 is formed by the flattening layer 1.
Since it is formed on No. 5, it has low hardness and is vulnerable to external impact, so that there is a problem that the first pattern electrode 17 is peeled from the flattening layer 15 and the yield is reduced.

An object of the present invention is to solve the above problems and to obtain a predetermined uniform gap even if the thickness of the color filter layer is different for each first substrate, and to provide a color liquid crystal display panel. It is an object of the present invention to provide a color liquid crystal display panel which has a uniform gap between the central portion and the peripheral portion in the vicinity of the seal portion, is resistant to external impact, and has high mass productivity.

[0016]

In order to achieve the above object, the color liquid crystal display panel of the present invention adopts the constitution described below.

The color liquid crystal display panel of the present invention comprises a first transparent substrate, a color filter layer, a dummy color filter layer, a planarizing layer, a first pattern electrode and a first alignment film. A second substrate having a second transparent substrate, a second pattern electrode, and a second alignment film, and a seal portion for bonding the first substrate and the second substrate together,
A region outside the seal portion of the first substrate is a region where the planarization layer is not formed.

Further, the color liquid crystal display panel of the present invention comprises a first substrate provided with a first transparent substrate, a color filter layer, a dummy color filter layer, a flattening layer, a first pattern electrode and a first alignment film. A second transparent substrate, a second substrate having a second pattern electrode and a second alignment film, and a seal portion for bonding the first substrate and the second substrate together. The first pattern electrode is formed in a region where the flattening layer and the dummy color filter layer of the seal portion of the substrate are not formed.

Further, the color liquid crystal display panel of the present invention is
A first transparent substrate, a color filter layer, a dummy color filter layer, a planarizing layer, a first pattern electrode, a first alignment film, and a dummy electrode provided on the dummy color filter layer via the planarizing layer. 1 substrate, a 2nd substrate provided with a 2nd transparent substrate, a 2nd pattern electrode, and a 2nd alignment film, and a seal part which sticks the 1st substrate and the 2nd substrate together In the region of the seal portion of the first substrate where the flattening layer, the dummy color filter layer and the dummy electrode are formed, the first pattern electrode is not formed.

Further, the color liquid crystal display panel of the present invention comprises
A first substrate including a first transparent substrate, a color filter layer, a dummy color filter layer, a flattening layer, a first pattern electrode, and a first alignment film, a second transparent substrate and a second pattern electrode. A second substrate comprising: and a second alignment film,
A seal part having a seal inner spacer and bonding the first substrate and the second substrate together, and a panel inner spacer provided between the first substrate and the second substrate inside the seal part, The inner spacer of the seal and the inner spacer of the panel are characterized by having substantially the same particle size.

[0021]

In the color liquid crystal display panel of the present invention, the region outside the seal portion of the first substrate has the flattening layer as a non-formation region, and further the first pattern electrode below the seal portion of the first substrate. In this area, the flattening layer and the dummy color filter layer are not formed.

Further, the first portion of the lower portion of the seal portion of the first substrate is
The area where the pattern electrode is not formed is an area where the flattening layer, the dummy color filter layer, and the dummy electrode are formed, and the particle diameter of the inner spacer of the seal and the inner particle diameter of the panel are the same. .

As a result, the pattern electrode provided in the region outside the seal portion of the first substrate can maintain the hardness capable of withstanding a slight impact from the outside.

Further, the gap between the two first substrates and the second substrate is equal in the central portion and in the peripheral portion near the seal portion, and the thickness of the color filter layer is different for each first substrate. However, it is not necessary to adjust the particle size of the panel inner spacer or the particle size of the seal inner spacer for each first substrate, and a predetermined uniform gap can be obtained.

[0025]

The embodiments of the present invention exemplify an STN type color liquid crystal display panel, and the structure of the color liquid crystal display panel in the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing a formation area of a seal portion and a flattening layer of a color liquid crystal display panel of the present invention.

FIG. 2 is a sectional view showing a section taken along the line AA of FIG. 1 of the color liquid crystal display panel of the present invention.

FIG. 3 is a sectional view showing a section taken along the line BB shown in FIG. 1 of the color liquid crystal display panel of the present invention.

FIG. 4 is a cross-sectional view showing a cross section of the seal portion of the color liquid crystal display panel of the present invention taken along the line CC of FIG.

The configurations of the first substrate 30 and the second substrate 31 will be described by alternately using FIG. 1, FIG. 2, FIG. 3, and FIG.

The first substrate 30 is formed on the first transparent substrate 11 by a dyeing method or a pigment dispersion method in the area inside the seal portion 22 and the color filter layer 13 and the seal portion 22.
And a dummy color filter layer 14 formed in a region below the first pattern electrode 17 is not provided.

On the first substrate 30, a flattening layer 15 made of acrylic resin is formed to flatten the color filter layer 13 and the dummy color filter layer 14.

The flattening layer 15 is formed on the first transparent substrate 11.
Is not formed in the region outside the seal portion 22 and in the formation region of the first pattern electrode 17 below the seal portion 22 of the first transparent substrate 11.

Further, the planarizing layer 15 is the first transparent substrate 11
And the dummy color filter layer 14 is formed in a region inside the seal portion 22 and in a region below the seal portion 22 of the first transparent substrate 11 where the first pattern electrode 17 is not formed.

Further, the first substrate 30 has the planarization layer 15 thereof.
First pattern electrodes 17 made of a transparent conductive film are formed on the upper surface and the first transparent substrate 11 up to the end surface of the first transparent substrate 11. Further, in the region where the first pattern electrode 17 is not formed, the dummy electrode 18 is formed on the flat lower layer 15 on the dummy color filter layer 14.

Further, the first substrate 30 is formed on the first pattern electrode 17, the dummy electrode 18 and the flat lower layer 15 so as to cover the seal inner spacer 24 with the first alignment film 20 which is subjected to the alignment treatment by the rubbing treatment. The configuration is

The second substrate 31 is formed by forming the second pattern electrode 19 made of a transparent conductive film on the second transparent substrate 12 so as to straddle the seal inner spacer 24.
The second alignment film 21 subjected to the alignment treatment by the rubbing treatment is formed on the pattern electrode 19 so as to cover the seal inner spacer 24.

The configuration shown in FIGS. 1, 2, 3, and 4 will be described in more detail in order. FIG. 1 is a plan view showing the configuration of the first transparent substrate 11, the second transparent substrate 12, the seal portion 22, and the flattening layer 15, and the first substrate 3 is provided below the seal portion 22.
The first pattern electrode 17 and the second substrate 31 which form 0.
FIG. 6 is a plan view showing a state in which a flattening layer 15 is not formed in a region formed by the second pattern electrode 19 forming the above and a region outside the seal portion 22.

FIG. 2 corresponds to the line AA in FIG.
3 is a cross-sectional view showing a cross section parallel to a region in which the first pattern electrode 17 forming the substrate 30 of FIG. 1 is formed.
The color filter layer 13 and the seal portion 22 formed thereon
A planarizing layer 15 formed to cover the color filter layer 13 inside, and on the planarizing layer 15 and the first transparent substrate 11
The first pattern electrode 17 formed on the upper part and the seal part 22
The first substrate 30 is composed of the lower portion of the substrate and the first alignment film 20 formed inside the seal portion 22.

The structure of the sectional view shown in FIG. 2 has a second transparent substrate 12, a second pattern electrode 19 formed on the second transparent substrate 12, an upper portion of the seal portion 22 and the seal portion 2.
Second alignment film 21 formed on the inner side of the second
Substrate 31 of.

Further, in the configuration of the cross-sectional view shown in FIG. 2, the seal portion 22 in which the seal inner spacer 24 for determining the gap between the first substrate 30 and the second substrate 31 is mixed, the first substrate 30 and the second substrate 31. It is composed of a panel internal spacer 23 that determines a gap with the substrate 31, and a liquid crystal layer 25 that is injected inside the seal portion 22.

FIG. 3 corresponds to the line BB in FIG.
3 is a cross-sectional view showing a cross section parallel to a region in which the first pattern electrode 17 of the substrate 30 of FIG. 1 is not formed.
1. The color filter layer 13 formed on 1 and the seal portion 2
A dummy color filter layer 14 formed on the lower part of 2,
The flattening layer 15 is formed on the inside of the seal portion 22 and over the seal portion 22 so as to cover the color filter layer 13 and the dummy color filter layer 14, and the seal portion 22 is formed on the flattening layer 15. the dummy electrode 18 constitute a first substrate 30 in the first alignment layer 20 forming the inside of the lower and the sealing portion 22 of the seal portion 22.

The structure of the sectional view shown in FIG. 3 has the second transparent substrate 12, the second pattern electrode 19 formed on the second transparent substrate 12, the upper portion of the seal portion 22 and the seal portion 2.
Second alignment film 21 formed on the inner side of the second
Substrate 31 of.

Further, in the configuration of the sectional view shown in FIG. 3, the seal portion 22 into which the seal inner spacer 24 for determining the gap between the first substrate 30 and the second substrate 31 is mixed, the first substrate 30 and the second substrate 31. It is composed of a panel internal spacer 23 that determines a gap with the substrate 31 and a liquid crystal layer injected inside the seal portion 22.

FIG. 4 corresponds to the line CC of FIG.
3 is a cross-sectional view showing a cross section of the seal portion 22 orthogonal to a region where the first pattern electrode 17 forming the substrate 30 of FIG. The color filter layer 14, the first pattern electrode 17, the flattening layer 15 formed so as to cover the dummy color filter layer 14, the dummy electrode 18 formed on the flattening layer 15, and the first portion below the seal portion 22. constitute the first substrate 30 in the first alignment layer 20 formed to cover the first pattern electrode 17 and the dummy electrode 18.

The structure of the sectional view shown in FIG. 4 has the second transparent substrate 12, the second pattern electrode 19 formed on the second transparent substrate 12, the upper part of the seal part 22 and the seal part 2.
Second alignment film 21 formed on the inner side of the second
Substrate 31 of.

Further, the structure of the sectional view shown in FIG. 4 is composed of the seal portion 22 into which the seal inner spacer 24 which determines the gap between the first substrate 30 and the second substrate 31 is mixed.

As is clear from the above description, the particle diameter of the seal inner spacer 24 of the seal portion 22 and the particle diameter of the panel inner spacer 23 can be made substantially the same, and the color filter layer 13 can be made. The upper liquid crystal layer 25 and the liquid crystal layer 25 near the seal portion 22 can have a uniform thickness.

Next, a manufacturing method for obtaining the structure of the color liquid crystal display panel of the present invention will be described with reference to FIGS. 1, 2, 3, and 4.

A color filter layer 13 and a dummy color filter layer 14 each having a film thickness of 1.2 μm are provided on the first transparent substrate 11 by a dyeing method. The color filter layer 13 and the dummy color filter layer 14 are formed in the same process.

An acrylic photosensitive resin JNPC-1 is formed on the entire surface of the first transparent substrate 11 forming the color filter layer 13 and the dummy color filter layer 14.
0 (manufactured by Japan Synthetic Rubber Co., Ltd.) by spin coating method to a film thickness of 2.5
It is formed in μm.

Thereafter, an exposure and development process is performed using a photomask, and the acrylic photosensitive resin is patterned to form the flattening layer 15.

Further, ITO (Indium-Tin-Oxide), which is a transparent conductive film, is formed by sputtering to have a film thickness of 350 nm. After that, a photosensitive resin is formed on the entire surface, an exposure and development process is performed using a photomask, the photosensitive resin is patterned, and the ITO is patterned using the photosensitive resin as an etching mask. The pattern electrode 17 and the dummy electrode 18 are formed.

Further, polyimide is formed on the first pattern electrode 17 by flexographic printing to have a film thickness of 50 nm,
Baking is performed at a temperature of 180 ° C. for 1 hour, alignment treatment is performed by rubbing treatment, the first alignment film 20 is provided, and the first substrate 30 is formed.

The second transparent substrate 12 is provided with a second pattern electrode 19 made of a transparent conductive film and an alignment film 21 made of polyimide formed by the same method as described above.
Create 1.

After that, the first substrate 30 and the second substrate 31
To maintain a constant gap and to provide the liquid crystal layer 25,
The first substrate 30 and the second substrate 31 are attached to each other by the seal portion 22.

This is a seal part 2 made of an epoxy resin containing a seal inner spacer 24 on either one of the substrates.
2 is formed by a screen printing method or a dispenser printing method, and the panel inner spacer 23 having the same particle diameter as the seal inner spacer 24 is formed on the other substrate.
Then, the first substrate 30 and the second substrate 31 are superposed on each other.

After that, the first substrate 30 and the second substrate 31
While pressurizing and, heat treatment is performed at a temperature of 150 ° C. for 2 hours to cure the seal portion 22. Then, the liquid crystal layer 25 is provided between the first substrate 30 and the second substrate 31.

At this time, the seal portion 22 is approximately 50% in each of the flattening layer 15 portion and the first pattern electrode 17 portion.
The seal portion 22 and the flattening layer 15
Design the pattern. The sealing portion 22 is the flattening layer 15 portion
Fig. 3 shows that the seal part 22 extends over the
FIG. 2 shows the state of straddling 17 parts of the electrode.
Both states are shown from different directions.

[0060]

As is apparent from the above description, in the color liquid crystal display panel of the present invention, the region outside the seal portion of the first substrate is the region where the flattening layer is not formed.
The pattern electrode provided in the area outside the seal portion of the substrate can maintain the hardness that can withstand an external impact, and the need for careful handling can be considerably reduced.

Further, by forming a region consisting of the dummy color filter layer, the flattening layer and the dummy electrode under the seal portion, regardless of the thickness of the color filter layer,
The central part and the peripheral part of the panel have the same gap, and the inner spacer of the panel and the inner spacer of the seal can have the same particle size. Further, even if the thickness of the color filter layer is different for each first substrate, the first substrate and the second substrate are
It becomes possible to obtain a predetermined uniform gap, and the mass productivity of the color liquid crystal display panel is significantly improved.

[Brief description of drawings]

FIG. 1 is a plan view showing a formation region of a seal part and a flattening layer of a color liquid crystal display panel in an example of the present invention.

FIG. 2 is a cross-sectional view showing a cross section taken along the line AA shown in FIG. 1 of the color liquid crystal display panel in the example of the present invention.

FIG. 3 is a cross-sectional view showing a cross section taken along line BB of FIG. 1 of the color liquid crystal display panel in the example of the present invention.

FIG. 4 is a cross-sectional view showing a cross section taken along the line C-C shown in FIG. 1 in the seal portion of the color liquid crystal display panel in the example of the present invention.

FIG. 5 is a plan view showing a seal portion and a flattening layer of a color liquid crystal display panel in a conventional example.

FIG. 6 is a cross-sectional view showing a structure of a conventional color liquid crystal display panel.

[Explanation of symbols]

11 First transparent substrate 12 Second transparent substrate 13 Color filter layer 14 Dummy color filter layer 15 Flattening layer 17 First pattern electrode 18 Dummy electrode 19 Second pattern electrode 20 First alignment film 21 Second alignment film 22 Seal part 23 Panel internal spacer 24 Seal internal spacer 25 Liquid crystal layer

Claims (2)

(57) [Claims] 1. A first transparent substrate, a color filter layer, a dummy color filter layer, a flattening layer, a first pattern electrode, and a first alignment film, and a second transparent substrate. A second substrate having a second pattern electrode and a second alignment film; and a seal portion for bonding the first substrate and the second substrate together, and across the seal portion of the first substrate. , Planarization layer and dummy
The non-formation area with the color filter layer is provided in a striped pattern.
A color liquid crystal display panel, wherein a first pattern electrode is arranged in a formation region . 2. In addition to the structure of claim 1, on the dummy color filter layer of the seal portion of the first substrate.
A color liquid crystal display panel, characterized in that a dummy electrode is provided via a flattening layer .