JPH10206840A - Color liquid crystal display device and its manufacture method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the coloration of liquid crystal which is applied with no voltage and to prevent the display quality of the liquid crystal display device from deteriorat ing by making colored pixels different in thickness according to display colors and adjusting columnar bodies to height equal to a liquid crystal sandwiching invertal. SOLUTION: After a colored layer 5 of R is laminated on a columnar body 4 which is adjacent to a colored pixel of R, a colored layer 6 of G which is smaller in area than the colored layer 5 of R and a colored layer 7 of B is formed which is equal in area to or smaller than the colored layer 6 of G are formed to obtain a columnar body which is equal to the sandwiching interval of the liquid crystal display device. After a colored layer 9 of R which is equal in area to a columnar body 8 adjacent to a colored pixel of G is formed of a colored pixel material of R on the adjacent columnar body 8, the columnar body is coated with a colored layer 10 of G to as thick as the colored pixel of G and then the height of the part where the colored layer of R is already formed becomes larger the height of the colored pixel of G; when a colored layer 11 of B is formed at the same time with the colored pixel of B, a columnar body can be formed which is as tall as the columnar body 4 adjacent to the colored pixel of R.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color liquid crystal display device, and more particularly to a liquid crystal display device characterized by maintaining a distance between substrates holding liquid crystal and a method of manufacturing the same.

[0002]

2. Description of the Related Art A liquid crystal display device is formed by opposing a transparent substrate such as glass provided with a transparent electrode with a liquid crystal layer interposed therebetween, and orienting the liquid crystal in a certain direction by a voltage applied between the electrodes. The image is displayed using transparent and opaque parts. A color liquid crystal display device generally includes three colored pixels of red (R), green (G), and blue (B) on any one of transparent electrode substrates, and three primary colors are formed by a shutter action of liquid crystal. A desired color is displayed by adding colors.

In a display using a twisted nematic (TN) liquid crystal generally used in a liquid crystal display device, ideally, when no voltage is applied, the liquid crystal is desired to completely block light and not transmit light. In fact, due to the optical rotation of the TN liquid crystal, the linearly polarized light incident on the liquid crystal cell becomes elliptically polarized light, and a part of the light passes through the liquid crystal cell. Therefore, even in the normally black state where no voltage is applied, some light is transmitted. Since the light transmittance depends on the thickness of the liquid crystal layer and the incident wavelength, in the dark state where no voltage is applied, the light is colored with light leakage and the color display quality is deteriorated. Therefore, in order to solve such a problem, the thickness of the liquid crystal layer is set to a predetermined thickness in the order of R, G, and B from the larger one for each of the R, G, and B colored pixels. For this reason, the thickness of the colored pixels formed on the color filter is increased in the order of R, G, and B.

In a liquid crystal display device, a spacer is mixed in a liquid crystal to maintain a liquid crystal sandwiching interval. However, in a liquid crystal display device having a different thickness according to the color of a colored pixel, a liquid crystal display device having a constant interval is used. In comparison, a large weight concentrates on the colored pixel portion having the smallest interval.

In order to solve such a problem, Japanese Patent Application Laid-Open No. 60-202423 discloses a technique in which the thickness of a liquid crystal layer is changed in accordance with a color pixel, the thickness of the liquid crystal layer is small, and the holding distance is small. It has been proposed that the area of the blue (B) colored pixel is made larger than other colored pixels to distribute the weight on the spacer. According to this method, it is possible to prevent coloring of the liquid crystal display device due to a difference in light wavelength and to prevent deformation of the spacer due to concentration of a load on the spacer.
A large amount of particles of about 00 particles / mm ² are dispersed in the liquid crystal. However, when the particles are dispersed in a highly viscous liquid crystal and injected into the holding space, the spacers are not uniformly dispersed, and the spacers are partially dispersed. There was a problem that a phenomenon of stagnation occurred and display quality deteriorated.

[0006]

SUMMARY OF THE INVENTION The present invention prevents the liquid crystal display from being colored when no voltage is applied due to the difference in the wavelength of light in the liquid crystal display device, and reduces the display quality of the liquid crystal display device due to the dispersion of spacers. It is an object to prevent it.

[0007]

According to the present invention, there is provided a color liquid crystal display device in which a liquid crystal layer is sandwiched between a color filter and a counter substrate. A color liquid crystal display device having a color filter in which a columnar body is formed in a non-display portion by stacking a plurality of colored layers at a height corresponding to a liquid crystal sandwiching interval. In a method of manufacturing a color liquid crystal display device in which a liquid crystal layer is sandwiched between a color filter and a counter substrate, the thickness of a colored pixel is formed as a different thickness according to a display color, and a plurality of colored layers are formed in a non-display portion. When forming stacked pillars,
Colors for manufacturing color filters by adjusting the thickness of the colored layer other than the lowermost layer of the column by changing the area of the colored layer formed in the lower layer to adjust the height of the column to a height that matches the liquid crystal sandwiching interval This is a method for manufacturing a liquid crystal display device.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS That is, in the liquid crystal display device of the present invention, the thickness of the colored layer is changed according to the color, and the distance between the color filter of the liquid crystal display device and a substrate such as a TFT facing the color filter is changed. In order to maintain the above, a columnar body made of a stack of colored pixels is formed. The color filter of the liquid crystal display of the present invention will be described with reference to the drawings.

FIG. 1 is a view for explaining an embodiment of the present invention. FIG. 1 (A) shows a partial plan view of a color filter, and FIG. 1 (B) shows FIG. 1 (A). 2 is a cross-sectional view of the liquid crystal display device taken along the line AA in FIG. A black matrix 2 having a desired pattern is formed on a transparent substrate 1 such as a glass substrate by depositing metal chromium or the like by sputtering or the like. The black matrix can also be formed by forming a desired pattern after applying a photosensitive resin containing carbon black or a metal oxide. After the formation of the black matrix,
The colored pixel 3 is formed. The order of forming the colored pixels is as follows: R (red), G (green), B
It is preferable to form them in the order of (blue).

Colored pixels can be formed by applying a synthetic resin composition containing a pigment or the like and eluting unnecessary portions using a predetermined pattern. If you use a conductive material,
A colored pixel can be formed only by development processing after exposure using a predetermined photomask.

When a colored pixel is formed, a photomask having a pattern for forming a pillar is used in addition to the pixel forming pattern, so that a colored layer is formed in the pillar forming portion using the same material as the colored pixel. Form. When the colored pixels are formed as stripes and the columnar body forming portion is formed in a dot-shaped pattern, as shown in the cross-sectional view of FIG. Colored layer 9,
13 are formed, and then the G colored layers 6 and 14 are formed when the G colored pixel 10 is formed, and the B colored layers 7 and 11 are formed when the B colored pixel 15 is formed. .

The pillars 4 adjacent to the R colored pixels have R
After the colored layer 5 is laminated, the area of the G colored layer 6, the area of which is smaller than that of the R colored layer, is equal to the area of the G colored layer, or G
By forming the B colored layer 7 having a smaller area than that of the colored layer, a columnar body equal to the sandwiching interval of the liquid crystal display device can be formed.

On the pillar 8 adjacent to the G colored pixel, an R colored layer 9 having an area equal to the area of the pillar is formed from the R colored pixel material. When the colored layer 10 is applied, the height of the already formed R colored layer 9 is higher than the height of the G colored pixel, and then the B colored layer 11 is simultaneously formed when the B colored pixel is formed. Is formed, a columnar body having the same height as the columnar body 4 adjacent to the R colored pixel can be formed.

Further, the columnar body 1 adjacent to the B colored pixel 1
Similarly, after forming the R colored layer 13 having the same area as the columnar body with the R colored pixel material, the colored layer 14 having the thickness for the G colored pixel is formed in the same area as the R colored layer 13. When the B colored layer 15 is formed with a larger area and the thickness required by the B colored pixels, the portion where the G colored layer is formed is higher than the other portions. Thus, a columnar body having the same height as the other columnar bodies can be obtained, and the distance between the columnar body and the counter substrate 16 can be maintained at a predetermined size.

In the present invention, it has been found that such two kinds of requirements for the thickness, that is, the thickness of the colored layer and the holding of the liquid crystal sandwiching interval, are formed by a single operation. In other words, when the thickness of the coloring layer to be formed is large, the area of the coloring layer for the columnar body formed earlier is large because the amount of the synthetic resin composition flowing out due to the difference in height from the surroundings is small. In the case where the thickness of the colored layer to be formed is large, and conversely, if the area of the previously formed colored layer is small, the applied colored layer flows out to the surroundings and the height is leveled, and the formed colored layer is formed. Have found a phenomenon that the height of the image becomes low. By utilizing such a phenomenon, it is possible to adjust the height of the columnar body on which the colored layers are stacked to the same liquid crystal sandwiching interval while setting the thickness of the colored pixel of the display unit to a predetermined thickness. .

On the color filter on which the colored layer is formed,
A transparent protective film made of a synthetic resin or an inorganic substance may be formed. Further, a transparent electrode film for driving a liquid crystal made of ITO or the like is formed on the coloring layer directly or after forming a protective film.

If there is an electrical problem between the ITO and the opposing substrate, the columnar portion may be masked during the ITO film formation. When a black matrix is formed on the TFT substrate side, a columnar portion is also formed on the TFT substrate side with a non-conductive black matrix, and is combined with the columnar portion on the color filter side.
Spacing can be maintained.

Although the columnar body can be formed on the colored pixel, it can be formed on a portion that does not become an effective display area, such as a black matrix portion that partitions the colored pixel.

The columnar body is, for example, 0.3 mm long and 0.1 mm wide.
If one pixel is provided for each 1 mm colored pixel, 1 mm
^{In 2} , approximately 33 spacers can be formed. This number is smaller than a value of 100 to 200 / mm ^{2, which} is a value obtained when a spacer such as a spherical shape of a synthetic resin is mixed with a normal liquid crystal, but the particle size distribution is similar to that of a spacer made of a synthetic resin. Since there is no variation or uneven distribution in the liquid crystal and the like, they are arranged uniformly over the entire display surface, so that the load over the entire display surface becomes uniform and the object can be sufficiently achieved.

[0020]

Embodiments of the present invention will be described below in more detail. Example 1 7 having a short side of 370 mm, a long side of 470 mm, and a plate thickness of 1.1 mm
A 0.2 μm-thick chromium oxide / chromium laminated structure film was formed on 059 glass (manufactured by Corning Incorporated) by sputtering. Observation from the glass surface side gave a low reflection optical density of 4.0. Next, a photoresist (OFPR-800 manufactured by Tokyo Ohka) is applied to a thickness of 0.5 μm, exposed by using a mask having a predetermined pattern formed by pre-baking, and after developing the resist, chromium oxide / chrome The film was subjected to etching, resist stripping, washing and drying steps to form a black matrix.

Next, an anthraquinone red pigment (CI: a mixture of Pigment Red 177 and Pigment Yellow 139) having a submicron particle size is dispersed in a solvent and a radical polymerization type photopolymer (acrylic), and benzyl methacrylate-methacrylic acid copolymer is dispersed. Ethyl 3-ethoxypropionate as a solvent was added to the union, pentaerythritol tetraacrylate, and 4- [PN, N-di (ethoxycarbonylmethyl)]-2-6-di (trichloromethyl) -S-triazine as a solvent. Then, a composition of a photosensitive material adjusted to a solid content of 30% and a viscosity of 15 cP (25 ° C.) was applied so as to have a thickness of 3 μm after the final heat treatment. After pre-baking at 100 ° C., it is exposed to light using a mask for forming a red pattern, developed, washed, dried, and post-baked at 200 ° C. to form a red colored pixel.
A red colored layer for forming columnar portions having a size of μm was formed.

Next, a phthalocyanine green pigment (C
I: a mixture of Pigment Green 7 and Pigment Yellow 83) in a composition similar to that used for the red photosensitive material, and dispersing the photosensitive material so as to have a thickness of 3.6 μm after the final heat treatment. Was applied. After pre-baking at 100 ° C., it is exposed to light using a green pattern forming mask, developed, washed, dried, and then post-baked at 200 ° C. to form green colored pixels, and on a columnar body formed in a black matrix portion. 15 μm × 25
A green colored layer for forming columnar portions having a size of μm was formed.

Next, a phthalocyanine blue pigment (C
3. A photosensitive material in which a photosensitive material in which I: Pigment Blue 15: 3 and Pigment Violet 23 are dispersed is dispersed in a composition similar to that used for the red photosensitive material. It was applied to a thickness of 7 μm. After pre-baking at 100 ° C., it is exposed to light using a mask for forming a blue pattern, developed, washed, and dried, and then post-baked at 200 ° C. to form green colored pixels, and on a columnar body formed in a black matrix portion. Then, a blue colored layer for forming a columnar portion having a size of 12 × 22 μm was formed. After an alignment film made of polyimide was formed on the color filter thus obtained, the glass substrate on which the TFT was formed was bonded using an epoxy resin as a sealant, and TN liquid crystal was sealed as a liquid crystal.

Further, the present invention is not limited to the above-described embodiment.
A similar columnar portion may be formed on the T substrate side, and the columnar portions may be opposed to each other to form a liquid crystal sandwiching interval. Also, by using a photosensitive composition for the overcoat material used as a protective film, by laminating a columnar portion when forming the protective film,
It is also possible to increase the liquid crystal sandwiching interval.

[0025]

According to the present invention, in a liquid crystal display device in which a liquid crystal is sandwiched between two substrates, the thickness of a colored pixel of a color filter constituting the liquid crystal display device is changed according to the color, and the thickness of the color filter is changed. In the display area, a colored layer is laminated to form a columnar body for maintaining a distance between the liquid crystal display devices, so that even when a display using a twisted nematic (TN) liquid crystal is applied with no voltage applied, light is completely blocked and light is transmitted. It is possible to prevent the liquid crystal display surface from being colored undesirably, and it is not necessary to disperse particulate or rod-like spacer members in the liquid crystal, and the liquid crystal display surface is evenly arranged on the entire display surface. The columnar body having the function of a spacer can be formed simultaneously in the process of forming the colored pixels, so that there is no problem such as display unevenness due to uneven distribution of the spacer member, etc. It is possible to obtain a liquid crystal display device.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing one embodiment of a liquid crystal display device of the present invention.

[Explanation of symbols]

1 ... substrate, 2 ... black matrix, 3 ... colored pixel,
4 ... a columnar body adjacent to the R colored pixel, 5 ... R colored layer,
6 ... G colored layers, 7 ... B colored layers, 8 ... columns adjacent to G colored pixels, 9 ... R colored layers, 10 ... G colored layers,
11 ... B colored layer, 12 ... B column adjacent to the colored pixel, 13 ... R colored layer, 14 ... G colored layer, 15 ... B colored layer, 16 ... Counter substrate

Claims (2)

[Claims] 1. A color liquid crystal display device in which a liquid crystal layer is sandwiched between a color filter and a counter substrate, wherein the color pixel has colored pixels having different thicknesses according to display colors.
A color liquid crystal display device comprising a color filter in which a columnar body in which a plurality of colored layers are stacked at a height corresponding to a liquid crystal sandwiching interval is formed in or near a non-display portion of each colored pixel. 2. A method of manufacturing a color liquid crystal display device in which a liquid crystal layer is sandwiched between a color filter and a counter substrate, wherein the thickness of a colored pixel is formed as a different thickness according to a display color, and When forming a columnar body in which a plurality of colored layers are stacked in or near the non-display portion, the thickness of the colored layer other than the lowermost layer of the columnar body is adjusted by changing the area of the colored layer formed in the lower layer. And manufacturing a color filter having a height that matches the thickness of the stacked colored layers and the liquid crystal sandwiching interval.