JPH0933910A - Liquid crystal display device and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the manufacture of the liquid crystal display device which can be manufactured through an easy manufacturing process with high throughput, has a color filter having no color blurring at the peripheral part and excellent color reproducibility of every pixel, and can display a color image of high quality. SOLUTION: Only an exposed part 108 is hydrophilic and other parts are water-repellent, so only the exposed part 108 is colored selectively in red and other parts are never colored with coloring liquid and rather repels water and has no red blur, so that a red color cell 107R can be formed only at the exposed part 108. Similarly, a green color cell 107G and a blue color cell B are also formed on a glass substrate 106.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device provided with a color filter having no color bleeding in the peripheral portion of a color cell and capable of displaying a color image with good color reproducibility and display quality, and its manufacture. Regarding the method.

[0002]

2. Description of the Related Art In a liquid crystal display device, generally, two electrode substrates each having an electrode for forming a pixel, which are arranged so as to face each other, are arranged so as to face each other with a gap therebetween, and the periphery is sealed in the gap. The layers are sandwiched to form the main part.

Such a general structure of the liquid crystal display device applies to both the simple matrix type liquid crystal display device and the active matrix type liquid crystal display device.

In a simple matrix type liquid crystal display device, a plurality of scanning electrodes and a plurality of signal electrodes are arranged opposite to each other with a gap so that they intersect at right angles, and a liquid crystal layer is sandwiched in the gap to intersect each intersection. A pixel is formed for each.

In an active matrix type liquid crystal display device, a pixel electrode arranged for each pixel on an active matrix substrate and a counter electrode formed on a counter substrate are arranged to face each other with a gap, and the gap A liquid crystal layer is sandwiched between the pixel electrodes and a pixel is formed in each portion where each element electrode and the counter electrode face each other.

Among the liquid crystal display devices, a color filter is generally used in a liquid crystal display device capable of displaying an arbitrary color image on a flat screen.

The color filter has, for example, red, green, and blue (R) on at least one of the two electrode substrates.
・ G ・ B), or yellow ・ magenta ・ cyan (Y)
Colored cells of three primary colors such as M and C or a hue that enables color display are formed in a structure in which each pixel is arranged.

For example, in a simple matrix driving type color dot matrix type liquid crystal display device, a scanning electrode substrate having scanning electrodes patterned in a horizontal strip shape, and a signal electrode patterned in a vertical strip shape. A signal electrode substrate provided with a color filter is arranged so as to face each other with a gap (cell gap) between the scanning electrode and the signal electrode so that the scanning electrode and the signal electrode intersect at a substantially right angle, and the liquid crystal composition is placed in the gap. It is formed in a structure in which it is sandwiched and the periphery of the substrate is sealed.

Further, in an active matrix driving type color liquid crystal display device, for example, a thin film transistor (hereinafter abbreviated as TFT) using amorphous silicon (hereinafter abbreviated as a-Si) as a semiconductor layer is used as a switching element. A TFT array substrate having a pixel electrode connected thereto, a scanning line and a signal line, and a counter electrode facing the TFT array substrate and facing the TFT array substrate with a gap between the pixel electrode and the pixel electrode. A color filter having a counter substrate and having color cells corresponding to respective three primary colors such as R, G, and B arranged for each pixel is formed on one of the substrates.

A liquid crystal composition is injected by sealing the periphery of the gap to form a liquid crystal layer. As the liquid crystal layer, a nematic liquid crystal having a positive or negative dielectric anisotropy is generally used.

The rotation of the polarization plane of light is controlled for each pixel by using the rotation of the polarization plane of light by the nematic liquid crystal.
Combined with the polarizing effect of the two polarizing plates that sandwich the liquid crystal cell from above and below, it controls the transmission / blocking of light that passes through the liquid crystal cell to display an image.

In a liquid crystal display device for displaying such a color image, a color filter is generally used.

The color filter may be manufactured by a pigment dispersion method in which a pigment is dispersed in the layer to be colored to form a color filter, a dye dispersion method in which a dye is dispersed in the layer to be colored to form a color filter, or electrodeposition. There has been proposed an electrodeposition method for forming a color filter, or a printing method for forming a color filter by printing a coloring material of a color filter as ink on a substrate using a printing plate such as an intaglio plate or an offset plate. , Some have already been put to practical use.

However, in such conventional manufacturing methods, since the photofabrication process is frequently used in the manufacturing process of the color filter, there is a problem that the manufacturing process of the color filter becomes extremely complicated.

Further, in order to cope with the increasingly fine pixel size, the precision of the photofabrication process is required, but there is a problem that it is not easy to manufacture it with high precision and high yield. is there.

Further, in the printing method, a technique such as photolithography is not directly used when forming a color filter, but since the production of the printing plate is complicated, the same problem as described above occurs. In addition, the printing method has a problem that it is practically difficult to form an accurate color filter corresponding to a finer pixel size.

Therefore, as a method of manufacturing a fine color filter that does not use the above-described photolithography process, a manufacturing method of forming a color filter by projecting a coloring material onto a receiving layer using an inkjet device has been proposed. There is.

[0018]

However, in the case of manufacturing a color filter by such an ink jet method, conventionally, in the peripheral portion of the colored portion to which the projected coloring material is adhered, the coloring material of another color adjacent to the coloring portion is used. There is a problem that the colors are mixed with each other to cause bleeding, which makes it difficult to reproduce a clear color.

Therefore, even if the color filter can be formed with an extremely good throughput by the ink jet device, the color reproducibility of the obtained color filter is low. Therefore, there is a problem that the color reproducibility and display quality of a color image in a liquid crystal display device using such a conventional inkjet type color filter are lowered.

The present invention has been made in order to solve such a problem, and its purpose is to provide a simple manufacturing process with high throughput and to prevent color bleeding in peripheral portions. It is an object of the present invention to provide a method for manufacturing a liquid crystal display device that includes a color filter with good color reproducibility for each pixel and that can display a high-quality color image.

[0021]

According to another aspect of the present invention, there is provided a liquid crystal display device, wherein a first substrate having a first electrode and a first substrate which are arranged to face each other with a gap kept therebetween. A second substrate having second electrodes facing each other to form pixels, and at least one of the first substrate and the second substrate is provided with color cells of a plurality of colors for each portion corresponding to each pixel. A color filter colored in the color receiving layer, a light-shielding film formed so as to avoid the pixels and cover the non-pixel portion, and the gap between the first substrate and the second substrate. In a liquid crystal display device comprising a liquid crystal layer sandwiched between, one of each color cell of the color filter and the light-shielding film is colored and formed in a hydrophilic portion of the color-receiving layer, and the other is Color formation on the lipophilic part of the color receiving layer Is a liquid crystal display device characterized that.

Further, according to the method of manufacturing a liquid crystal display device of the present invention, a second substrate having a first substrate having a first electrode and a second electrode facing the first substrate and forming a pixel is provided. A step of arranging a substrate and a substrate so as to face each other while maintaining a gap; and a plurality of color cells of a plurality of colors are provided in at least one of the first substrate and the second substrate for each portion corresponding to each pixel in the coloring receiving layer. Forming a color filter by forming a color filter on the substrate, forming a light-shielding film so as to cover the non-pixel portion while avoiding each pixel, and between the first substrate and the second substrate. In the method for manufacturing a liquid crystal display device, including a step of sandwiching a liquid crystal layer in a gap, a colored receiving layer which is modified to be lipophilic when irradiated with an energy beam, but which is originally hydrophilic, is provided with the first substrate or Coating on at least one of the second substrates And, when coloring each of the plurality of colors, selectively irradiate the portion corresponding to the one color with the energy beam to denature the portion to be lipophilic, and the portion is colored. In the step of forming a color filter by selectively coloring the color with the oily coloring liquid over the plurality of colors, and in the step of forming the color filter in the coloring receiving layer, it is still modified to be lipophilic. And a step of forming a light-shielding film by selectively coloring the portion left as hydrophilic without being colored with a black aqueous coloring liquid to form a light-shielding film. Is the way.

A first substrate having a first electrode;
A step of arranging a second substrate having a second electrode facing the first substrate and forming a pixel so as to face each other with a gap being maintained between the first substrate and the second substrate; Forming a color filter by forming color cells of a plurality of colors in at least one of the portions corresponding to the respective pixels in the colored receiving layer, and a light-shielding film so as to cover the non-pixel portions while avoiding the respective pixels. And a step of sandwiching a liquid crystal layer in the gap between the first substrate and the second substrate in a method for manufacturing a liquid crystal display device, which is hydrophilic when irradiated with an energy beam. Of a coloring receptive layer that is modified to have a property of being naturally lipophilic on at least one of the first substrate and the second substrate, and coloring each of the plurality of colors At that time, the portion corresponding to the one color is By selectively irradiating Rugi beam, the portion is modified to be hydrophilic, and the portion is selectively colored with the aqueous coloring liquid of the color over the plurality of colors to form a color filter. In the step of forming the color filter in the step and the step of forming the color filter, the portion left as lipophilic without being modified to be hydrophilic is selectively blackened with a black oily coloring liquid. And a step of forming a light shielding film by coloring, which is a method for manufacturing a liquid crystal display device.

In the method for manufacturing a liquid crystal display device described in the second or third item, at least one of the step of forming the color filter and the step of forming the light shielding film is an ink jet. A method of manufacturing a liquid crystal display device, which comprises the step of projecting the colored liquid onto a predetermined portion of the colored receiving layer using a device.

Further, in the method for manufacturing a liquid crystal display device according to any one of the second to fourth items, ultraviolet rays are irradiated as the energy beam, which is a method for manufacturing a liquid crystal display device. .

Further, in the method for manufacturing a liquid crystal display device described as the fifth item, a method for manufacturing a liquid crystal display device is characterized in that an ultraviolet-modified polymer resin film is used as the color receiving layer. is there.

The hydrophilic color receiving layer may be, for example, a UV-modified polymer resin film obtained by adding a chemically amplified resist P (t-BOCST) / onium salt to a hydrophilic acrylic resin. It can be preferably used.

Examples of the lipophilic colored receiving layer include, for example, an ultraviolet-modified polymer resin film,
Chemically amplified resist P (t-BOCST) on hydrophobic acrylic resin
/ A material to which an onium salt is added can be preferably used.

As the above-mentioned aqueous coloring liquid, for example, a water-soluble dye, Basic Red 27, Basic Blue 7 or the like can be preferably used.

As the above oily coloring liquid, for example, oil-soluble dyes, Solvent Red 125, Solvent Blue 67, Solvent Yellow 25, etc. can be preferably used.

In the present invention, as described above, the color filter is selectively exposed to form a hydrophilic portion and a lipophilic portion separately in the colored receiving layer. That is, since color bleeding was likely to occur between adjacent portions, particularly between the light-shielding film and each color cell of the color filter, one of the light-shielding film and each color cell was made hydrophilic as a receiving layer, and the other was It is lipophilic. This makes it possible to easily form the color cells of the color filter and the light shielding layer without bleeding with each other. In other words, when developing a color filter by the conventional dyeing method, resist development and etching
Manufacturing a color filter by an inkjet method or an immersion (dyeing) method very easily and without bleeding of color cells, etc., using almost no complicated photolithography process such as process or lift-off process. You can As a result, according to the present invention, it is possible to provide a liquid crystal display device, which is provided with a color filter and can perform good color display, easily, at high throughput, and at low cost. Moreover, at this time, the problem of color bleeding in the peripheral portion of the color cell corresponding to each pixel, which has been a problem in the conventional inkjet method or dyeing method, is solved, and a color with good color reproducibility for each pixel is obtained. It is possible to provide a liquid crystal display device provided with a filter and capable of displaying a high-quality color image.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a liquid crystal display device according to the present invention will be described in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view showing an outline of a liquid crystal display device according to the present invention, and FIG. 2 shows a manufacturing method centering on a color filter, which is a main part of the present invention. It is a figure which shows an outline.

First, similar to the process of forming a general TFT array substrate on which TFTs (thin film transistors) and the like are formed, various kinds of film formation and patterning are repeated, and the a-Si TFT 101, the scanning line and the signal line ( Various structures generally required as a TFT array substrate, such as the pixel electrodes 102, are arranged on the glass substrate 103 to form the TFT array substrate 104.

Next, as shown in FIG. 2A, a water-repellent (lipophilic) receiving layer 107 is applied over the entire surface of the glass substrate 106 of the counter substrate 105.

Next, each color cell as a color filter is colored. For example, in order to first color red in a predetermined portion 108 to form a red cell, as shown in FIG. 2B, a photomask having a mask pattern 109 in which an opening is formed at a position to be colored. 110 is used to selectively irradiate a portion 108 where a red cell is to be formed with ultraviolet rays as an energy beam to make the portion 108 hydrophilic.

Subsequently, the entire glass substrate 106 on which the water repellent receiving layer 107 is formed is immersed in a water-soluble coloring liquid in which a red dye or pigment is dispersed or dissolved in water.
At this time, since only the exposed portion 108 is hydrophilic and the other portion is water repellent, only the exposed portion 108 is selectively colored red and the other portion is colored with the coloring liquid. Rather than repelling water, the red color does not bleed, and the red color cell 107R can be formed only in the exposed portion 108. Similarly, the green color cell 107G and the blue color cell B are also formed on the glass substrate 106. This is shown in FIG.

Next, the color cells 107R, 107G, 107
After B is sufficiently dried, the entire glass substrate 106 on which the above-described color cells 107R, 107G and 107B are formed is immersed in an oily coloring liquid in which a black dye or pigment is dispersed or dissolved in an organic solvent, In the step (1), the water-repellent (lipophilic) portion 111 left unexposed is colored black. At this time, since the water-repellent portion 111 has a good compatibility with the oil-based coloring liquid, it is colored black by the oil-based coloring liquid, and this portion becomes the light-shielding film 112 as shown in FIG. 2D. Thus, the color cells 107R, 107G,
Color filter layer 1 including 107B and light shielding film 112
13 can be obtained.

After that, an alignment film material was applied on the entire surface and subjected to rubbing treatment to form an alignment film 114. on the other hand,
On the counter substrate 105, an ITO film is formed as a transparent electrode, and this is used as a counter electrode 115. An alignment film material is formed on the ITO film, and a rubbing process is performed to align the alignment film 116.
Was formed. Then, the sealing material 11 is provided along the peripheral edges of the substrates 104 and 105 (except for the injection port (not shown)).
7 was printed. Then, on the surface of the TFT array substrate 104, as a gap material (spacer) 118, Micropearl manufactured by Sekisui Fine Chemical Co., Ltd. having a particle diameter of 6 μm was dispersed.

Next, the substrates 104 and 106 are arranged so as to face each other so that the alignment films 114 and 116 face each other and the rubbing directions thereof are 90 degrees, and the sealing material 117 is heated to cure the sealing material 117. The substrates 104 and 106 were bonded together.

Next, a liquid crystal composition, ZLI-1565 (manufactured by E. Merck & Co., Inc.), was filled with S811 from the injection port by a conventional method.
Was added to form a liquid crystal layer 119, and the injection port was sealed with an ultraviolet curable resin. In this way, the structure of the main part of the liquid crystal display device can be manufactured, which is capable of color display with the color filter according to the present invention and has a display capacity of 100 pixels in vertical × 100 pixels in total.

The above-mentioned coloring is performed on the glass substrate 10 on which the water-repellent receiving layer 107 is formed as in the first embodiment.
Needless to say, instead of immersing the entire 6 in the coloring liquid, the coloring liquid may be projected onto the water-repellent receiving layer 107 by an inkjet method to be colored.

(Embodiment 2) In the second embodiment, instead of the water-repellent receiving layer 107 in the case of the above-mentioned first embodiment (rather conversely), a hydrophilic receiving layer is used. Is applied over the entire surface of the glass substrate 106 of the counter substrate 105, and a photomask 110 having a mask pattern 109 having an opening at a position corresponding to the portion 108 to be colored is used to form the portion to be colored. 10
8 is selectively irradiated with ultraviolet rays to modify the portion 108 to be water-repellent and colored with an oily coloring liquid containing a dye or a pigment. Then, the portion left unexposed is colored black with an aqueous coloring liquid in which a black dye or pigment is dispersed or dissolved in water.

Thus, the color cells 107R, 107G, 1
07B and a light-shielding film 112 in a portion other than the portion where they are formed and where light shielding is required as a so-called non-pixel region contributes to color image display with high color reproducibility and high display quality, without forming color bleeding with each other. It is possible to form a color filter that operates.

The above-mentioned coloring may be performed by immersing the entire glass substrate 106 on which the water-repellent receiving layer 107 is formed in the coloring liquid as in the first embodiment.

Regarding various structures other than the color filter, such as the TFT 101 and the pixel electrode 102,
It may be formed similarly to the first embodiment.

(Embodiment 3) In the third embodiment, a hydrophilic receptive layer is used instead of the water repellent receptive layer 107 in the first embodiment (in contrast to this). , The entire surface of the glass substrate 106 of the counter substrate 105 is coated, and a photomask 110 having a mask pattern 109 having an opening at a position corresponding to the portion 108 to be colored is used to form the portion 108 to be colored. Is selectively irradiated with ultraviolet rays to modify the portion 108 to be water-repellent and colored with an oily coloring liquid containing a dye or a pigment. Then, the portion left unexposed is colored black with an aqueous coloring liquid in which a black dye or pigment is dispersed or dissolved in water. The present embodiment is different from the above embodiment in that the coloring of each color described above is performed by an inkjet method using an inkjet device.

That is, in the hydrophilic receiving layer, the portion to be colored is exposed to ultraviolet rays to make the portion water repellent.

Next, by using an ink jet device, droplets in which red, green or blue dyes or pigments are dispersed or dissolved in an organic solvent are projected onto the optimum position to be colored to perform coloring. This coloring process is divided into red, blue and green.
This is performed for each color to form each color cell of the color filter by coloring.

Then, a liquid in which a black dye or pigment is dispersed or dissolved in water is projected onto an unexposed hydrophilic portion by using an ink jet device, and the portion is colored black to form a light-shielding film. 112 is formed.

Next, it was baked at 230 ° C. for 1 hour,
Color filter layer 113 colored with dye or pigment
Bake. Subsequently, as a protective layer (not shown), acrylic resin is spin-coated to a uniform thickness of 2 μm and then baked. Then, an ITO film is used as the counter electrode 115.
It is formed by a 150 nm mask sputtering method. After that, the liquid crystal display device according to the third embodiment of the present invention can be manufactured in the same manner as in the above-described respective examples after the step of forming the alignment film 116 and the like.

[0052]

According to the present invention, the manufacturing process of the color filter used for the color display type liquid crystal display element can be simplified, and the color display type liquid crystal display element using the same can be provided at a low cost.

Further, it is possible to provide a bright color display type liquid crystal display device having a high aperture ratio without considering an error in assembling the active matrix substrate and the counter substrate.

[Brief description of drawings]

FIG. 1 is a sectional view showing an outline of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an outline of a manufacturing method centering on a color filter which is a main part of the present invention among the liquid crystal display devices according to the embodiments of the present invention.

[Explanation of symbols]

101 ... a-SiTFT, 102 ... Pixel electrode, 103 ...
Glass substrate, 104 ... TFT array substrate, 105 ... Counter substrate, 106 ... Glass substrate, 107 ... Water repellent (lipophilic)
Receptive layer, 107R ... red cell, 107G ... green cell, 1
07B ... Blue cell, 112 ... Shading film, 113 ... Color filter layer, 114 ... Alignment film, 115 ... Counter electrode, 116
... Alignment film 117 ... Sealing material, 118 ... Gap material (spacer), 119 ... Liquid crystal layer

Claims (6)

[Claims] 1. A first substrate having a first electrode and a first substrate, which are arranged to face each other with a gap maintained between the first substrate and the first substrate.
A second substrate having a second electrode facing the substrate to form a pixel, and at least one of the first substrate and the second substrate having a plurality of colors for each portion corresponding to each pixel. Between the color filter in which the color cells are colored in the color receiving layer, the light-shielding film formed so as to avoid the pixels and cover the non-pixel portion, and between the first substrate and the second substrate In a liquid crystal display device comprising a liquid crystal layer sandwiched in the gap, one of each color cell of the color filter and the light shielding film is colored and formed in a hydrophilic portion of the color receiving layer, On the other hand, the liquid crystal display device is characterized in that the lipophilic portion of the colored receiving layer is colored. 2. A first substrate having a first electrode and a second substrate having a second electrode facing the first substrate to form a pixel are opposed to each other with a gap maintained. And forming a color filter by color-forming color cells of a plurality of colors in a color-receiving layer on at least one of the first substrate and the second substrate for each portion corresponding to each pixel. A step of forming a light-shielding film so as to cover the non-pixel portion while avoiding the pixels, the first substrate and the second substrate
In the method for manufacturing a liquid crystal display device, which comprises sandwiching a liquid crystal layer in the gap between the substrate and the substrate, a colored receptive layer that is denatured to be lipophilic when irradiated with an energy beam but is originally hydrophilic is formed. A step of applying on at least one of the first substrate or the second substrate; and, when coloring each of the plurality of colors, selecting the energy beam in a portion corresponding to the one color. And irradiating the portion to make it lipophilic, and selectively coloring the portion with the oily coloring liquid of the color over the plurality of colors to form a color filter, In the step of forming the color filter in the colored receiving layer, the portion left as hydrophilic without being modified to be lipophilic is selectively colored black with a black aqueous coloring liquid. Shape the light-shielding film Method of manufacturing a liquid crystal display device characterized by comprising the step of. 3. A first substrate having a first electrode and a second substrate having a second electrode facing the first substrate to form a pixel are opposed to each other with a gap maintained. And forming a color filter by color-forming color cells of a plurality of colors in a color-receiving layer on at least one of the first substrate and the second substrate for each portion corresponding to each pixel. A step of forming a light-shielding film so as to cover the non-pixel portion while avoiding the pixels, the first substrate and the second substrate
In the method for manufacturing a liquid crystal display device, comprising a step of sandwiching a liquid crystal layer in the gap between the substrate and the substrate, a colored receptive layer, which is modified to be hydrophilic when irradiated with an energy beam, is originally lipophilic. A step of applying on at least one of the first substrate or the second substrate; and, when coloring each of the plurality of colors, selecting the energy beam in a portion corresponding to the one color. Irradiation to selectively modify the portion to be hydrophilic and selectively color the portion with the aqueous coloring liquid of the color over the plurality of colors to form a color filter, In the step of forming the color filter in the colored receiving layer, a portion left as lipophilic without being modified to be hydrophilic is selectively colored black with a black oily coloring liquid. Shape the light-shielding film Method of manufacturing a liquid crystal display device characterized by comprising the step of. 4. The method for manufacturing a liquid crystal display device according to claim 2, wherein at least one of the step of forming the color filter and the step of forming the light shielding film is performed by using an inkjet device to perform the coloring. A method of manufacturing a liquid crystal display device, comprising the step of projecting a liquid onto a predetermined portion of the colored receiving layer. 5. The method of manufacturing a liquid crystal display device according to claim 2, wherein ultraviolet rays are irradiated as the energy beam. 6. The method for manufacturing a liquid crystal display device according to claim 5, wherein an ultraviolet-modified polymer resin film is used as the colored receiving layer.