JP2008203447A - Color liquid crystal display device and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color liquid crystal display device free from display irregularity and high in display quality. <P>SOLUTION: Level difference and variation is prevented by connecting frame light-shielding layers adjacent to each other on a color filter substrate or by forming a level correction layer 9 or a color layer between adjacent frame light-shielding layers 2. Since the level difference between frame light-shielding layers adjacent to each other in a horizontal or lateral direction is prevented, the cell gap is made uniform in the frame rim portion which functions as a sealing portion and in a display screen, and thereby a color liquid crystal display device showing uniform color tone and contrast within the display screen is provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a color liquid crystal display device used for a portable information device such as a mobile phone or an electronic notebook, a monitor of a personal computer, and the like, and a manufacturing method thereof.

  A color filter substrate used in a color liquid crystal display device has a large number of colored layers composed of three primary colors such as RGB arranged in a light-shielding frame for the purpose of light shielding so that the three primary colors are repeated on a glass substrate. Is generally formed. When this color filter substrate and the counter substrate on which the transparent electrode is formed are opposed to each other through the seal portion, a light shielding layer is also disposed under the seal portion so that the cell gap can be kept uniform over the display surface. A configuration is employed (see, for example, Patent Document 1).

A schematic plan view of a color filter substrate 10 used in a conventional color liquid crystal display device is shown in FIG. A plurality of display panels can be formed from the color filter substrate 10, and the number of colored layers 3 corresponding to the display screen of each display panel is formed on the transparent substrate 1 at a certain interval. . A frame light shielding layer 2 is formed around each colored layer 3. FIG. 2 is a schematic cross-sectional view of a color liquid crystal display device in which a conventional color filter substrate 10 and a counter substrate 11 are superimposed. The color filter substrate 10 and the counter substrate 11 are opposed to each other with a certain gap 12 filled later with liquid crystal. A transparent electrode 5 and a counter transparent electrode 7 having a desired pattern are provided on one surface of each substrate. The color filter substrate 10 has a configuration in which a colored layer 3 for forming a color filter is provided on the transparent substrate 1. Specifically, the colored layer 3 having a desired pattern is provided on the surface of the color filter substrate 10 with a thickness of about 1 μm. In FIG. 2, the colored layer 3 is composed of three primary colors of light, red (3R), green (3G), and blue (3B), and a frame light-shielding layer 2 having a desired pattern is provided. A flattening film 4 is provided on the frame light-shielding layer 2 and the colored layer 3 in order to flatten the surface unevenness. A transparent electrode 5 for applying a voltage to the liquid crystal layer 12 is provided thereon. On the other hand, a counter electrode 7 is formed on the counter substrate 11, and the color filter substrate 10 and the counter substrate 11 are fixed with a sealant 8 so that these transparent electrodes face each other, and a gap 12 between the color filter substrate 10 and the counter substrate 11. In this configuration, a liquid crystal layer is provided. In general, a large number of such structures are arranged on the surfaces of the transparent substrate 1 and the counter substrate 6. In the case of adopting the above-described configuration, a step corresponding to the thickness of the light shielding layer is generated between the frame light shielding layers 2 that are arranged in the plane and that are adjacent to each other vertically and horizontally. In this case, even when the planarizing film 4 is applied on the upper side, a gentle inclination occurs at the outer edge of the frame light-shielding layer 2, and a difference in cell gap occurs between the seal portion and the display surface. The cell gap is usually performed by disposing the display spacers 13 between the two substrates and mixing the seal spacers having a particle size suitable for the cell gaps in the seal portions. If the cell gap is different, the orientation of the liquid crystal molecules injected into the gap is different, which causes a deterioration in display quality such as poor contrast.
JP-A-6-273743

  In the conventional color liquid crystal display device, as described above, when the color filter substrate and the counter substrate on which the transparent electrode is formed are opposed to each other through the seal portion, the cell gap can be kept uniform throughout the display surface. The structure which arrange | positions the light shielding layer under a seal | sticker part is employ | adopted. In general, the color filter substrate is formed with a plurality of patterns arranged side by side. Therefore, in the case of this configuration, a gentle inclination occurs even when the planarizing film is applied due to a step corresponding to the thickness of the light shielding layer between the adjacent frame light shielding layers. When such a gentle inclination occurs, a step is generated between the display surface and the outer edge portion of the frame light shielding layer that actually corresponds to the seal portion. The cell gap is usually performed by dispersing spacers between both substrates and mixing seal portion spacers having a particle size corresponding to the cell gap into the seal portion. As described above, when there is a step on the surface of the color filter substrate, a difference in cell gap occurs between the counter substrate at the center portion and the outer edge portion in the display surface. If the cell gap is different, the orientation of the liquid crystal molecules injected into the gap is different, which causes a deterioration in display quality such as poor contrast. This step is a factor that degrades display quality, particularly in a display device using STN liquid crystal. Therefore, an object of the present invention is to provide a color liquid crystal display device having high display quality without display unevenness.

  The color liquid crystal display device of the present invention includes a color filter substrate having at least a frame light-shielding layer and a colored layer, and a counter substrate facing the color filter substrate with the liquid crystal layer interposed therebetween. A step correction layer having the same thickness as the frame light shielding layer is formed between the combined frame light shielding layers. With such a configuration, the step corresponding to the film thickness of the light shielding layer between the adjacent frame light shielding layers is eliminated, and no inclination occurs after the planarization film is applied. Therefore, there is no step between the display surface and the outer edge portion of the frame light shielding layer that actually corresponds to the seal portion. Therefore, it is possible to provide a color liquid crystal display device with high display quality without display unevenness.

  According to the color liquid crystal display device of the present invention, there is no step between the display surface and the outer edge portion of the frame light shielding layer that actually corresponds to the seal portion. An apparatus can be provided.

  A color liquid crystal display device according to the present invention includes a color layer formed corresponding to a display screen, a color filter substrate including a frame light-shielding layer formed around the color layer, and a color filter substrate and a sealant bonded to each other. A counter substrate and a liquid crystal layer provided in the gap between the color filter substrate and the counter substrate are provided, and a step correction layer having the same thickness as the frame light shielding layer is formed on the outer side of the frame light shielding layer on the color filter substrate. ing.

  The color liquid crystal display device of the present invention will be described with reference to FIG. FIG. 3 is a schematic plan view of the large color filter substrate 10. The color filter substrate 10 is formed by forming the frame light-shielding layer 2 on the transparent substrate 1 and the number of colored layers 3 on the display surface at a predetermined interval. FIG. 4 is a schematic cross-sectional view when the color filter substrate 10 and the counter substrate 11 used in the color liquid crystal display device of the present invention are overlaid. The color filter substrate 10 and the counter substrate 11 are opposed to each other with a certain gap 12 serving as a liquid crystal layer. A transparent electrode 5 and a counter transparent electrode 7 having a desired pattern are provided on one surface of each substrate. The color filter substrate 10 is provided with a colored layer 3 that forms a color filter. Here, the colored layer 3 is composed of red (3R), green (3G), and blue (3B), which are the three primary colors of light, and the frame light shielding layer 2 is provided in a desired pattern around it. Further, a step correction layer 9 having the same thickness as the frame light shielding layer 2 is formed between the adjacent frame light shielding layers 2. A planarizing film 4 is provided on the colored layer 3 in order to flatten the surface irregularities. A transparent electrode 5 for applying a voltage to the liquid crystal layer is provided thereon. On the other hand, a counter electrode 7 is formed on the counter substrate 11, and the color filter substrate 10 and the counter substrate 11 are fixed by a sealant 8 so that these electrodes face each other. A liquid crystal layer is provided in the gap between the color filter substrate 10 and the counter substrate 11. A large number of such configurations are arranged on the surfaces of the transparent substrate 1 and the counter substrate 6. According to such a configuration, even when the planarizing film 4 is applied, the outer edge portion of the frame light shielding layer 2 is not inclined. Therefore, since there is no difference in cell gap between the seal portion and the display surface, it is possible to provide a color liquid crystal display device with high display quality without display unevenness.

  Here, the step correction layer may be formed by extending the frame light shielding layer. Moreover, you may form a level | step difference correction layer using any one of the colored layers of a plurality of colors.

  Furthermore, in the method for manufacturing a color liquid crystal display device of the present invention, the colored layer corresponding to the display screen of one panel and the frame light-shielding layer formed around the display screen correspond to a plurality of panels. Forming a plurality of layouts on the substrate to produce a color filter substrate; joining the color filter substrate and the counter substrate with a sealant; and bonding the joined color filter substrate and the counter substrate into individual panels. A method of manufacturing a color liquid crystal display device comprising a step of separating, wherein a step correction layer having the same thickness as the frame light-shielding layer is formed between the frame light-shielding layers of individual panels adjacent on the color filter substrate. The individual steps are separated into individual panels at the level difference correction layer. By such a manufacturing method, a color filter substrate having a colored layer and a frame light-shielding layer formed therearound, a counter substrate bonded to the color filter substrate by a sealing agent, and a gap between the color filter substrate and the counter substrate are provided. A color liquid crystal display device in which a step correction layer having the same thickness as the frame light-shielding layer is formed on the outer side of the liquid crystal layer and the frame light-shielding layer on the color filter substrate can be manufactured.

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

  A liquid crystal display panel used in the color liquid crystal display device of this embodiment will be described with reference to FIG. The color filter substrate 10 is formed by forming a frame light-shielding layer 2 and a colored layer 3 on the display surface at a certain interval on a transparent substrate 1 such as a glass substrate. FIG. 4 is a schematic cross-sectional view when the color filter substrate 10 and the counter substrate 11 used in the color liquid crystal display device of this embodiment are overlaid. The color filter substrate 10 and the counter substrate 11 are opposed to each other with a certain gap 12 serving as a liquid crystal layer. A transparent electrode 5 and a counter transparent electrode 7 having a desired pattern are provided on one surface of each substrate. The transparent electrode 5 and the counter electrode 7 are formed in a desired pattern by a photolithography method. The transparent electrode 5 and the counter electrode 7 are transparent conductive films called ITO in which indium (In) containing tin (Sn) as an impurity is oxidized, and a desired resistance value can be set. Since ITO is a low-resistance semiconductor material, its resistance value is 10Ω / □ to 100Ω / □, which is the most general-purpose level. Usually, ITO is formed by a vacuum film forming method called a sputtering method or a vapor deposition method. The color filter substrate 10 has a configuration in which a colored layer 3 for forming a color filter is provided on the transparent substrate 1. Specifically, the colored layer 3 having a desired pattern is provided on the surface of the color filter substrate 10 with a thickness of about 1 μm. In FIG. 4, the colored layer 3 is composed of the three primary colors of light, red (3R), green (3G), and blue (3B), and the frame light-shielding layer 2 having a desired pattern has a thickness of about 1 μm. Is provided. Further, a step correction layer 9 having the same film thickness as the frame light shielding layer 2 is formed between the adjacent frame light shielding layers 2. The step correction layer 9 can be formed using a photosensitive acrylic resin or the like by a technique such as a photolithography method. A flattening film 4 is provided on the frame light shielding layer 2 and the colored layer 3 with a film thickness of about 2 μm in order to flatten the surface irregularities. A transparent electrode 5 for applying a voltage to the liquid crystal layer is provided thereon. On the other hand, the counter electrode 7 is formed on the counter substrate 11, and the color filter substrate 10 and the counter substrate 11 are arranged so that these transparent electrodes face each other, and the display portion spacers 13 are dispersedly arranged on the display surface, and then fixed by the sealant 8. In addition, a liquid crystal layer is provided in the gap 12 between the color filter substrate 10 and the counter substrate 11. In general, a large number of such structures are arranged on the surfaces of the transparent substrate 1 and the counter substrate 6. Thereafter, a large number of display surfaces arranged on the substrate are separated, and liquid crystal is sealed in the gap. Next, a polarizing plate is disposed on the upper and lower surfaces, and a lighting device is combined to obtain a color liquid crystal display device.

  FIG. 5 is a schematic plan view of the color filter substrate 10 used in the color liquid crystal display device of this embodiment. The color filter substrate 10 is formed by forming a frame light-shielding layer 2 and a colored layer 3 on the display surface at a certain interval on a transparent substrate 1 such as a glass substrate. FIG. 6 is a schematic cross-sectional view when the color filter substrate 10 and the counter substrate 11 used in the color liquid crystal display device of this embodiment are overlapped. The color filter substrate 10 and the counter substrate 11 are opposed to each other with a certain gap 12 serving as a liquid crystal layer. A transparent electrode 5 and a counter transparent electrode 7 having a desired pattern are provided on one surface of each substrate. The transparent electrode 5 and the counter electrode 7 are formed in a desired pattern by a photolithography method. The transparent electrode 5 and the counter electrode 7 are transparent conductive films called ITO in which indium (In) containing tin (Sn) as an impurity is oxidized, and a desired resistance value can be set. Since ITO is a low-resistance semiconductor material, its resistance value is 10Ω / □ to 100Ω / □, which is the most general-purpose level. Usually, ITO is formed by a vacuum film forming method called a sputtering method or a vapor deposition method. The color filter substrate 10 has a configuration in which a colored layer 3 for forming a color filter is provided on the transparent substrate 1. Specifically, the colored layer 3 having a desired pattern is provided on the surface of the color filter substrate 10 with a thickness of about 1 μm. In FIG. 6, the colored layer 3 is composed of the three primary colors of light, red (3R), green (3G), and blue (3B), and the frame light-shielding layer 2 having a desired pattern has a thickness of about 1 μm. Is provided. Here, the frame light-shielding layer 2 is formed so as to be extended to eliminate a step between adjacent frame light-shielding layers 2. A flattening film 4 is provided on the frame light shielding layer 2 and the colored layer 3 with a film thickness of about 2 μm in order to flatten the surface irregularities. A transparent electrode 5 for applying a voltage to the liquid crystal layer is provided thereon. On the other hand, the counter electrode 7 is formed on the counter substrate 11, and the color filter substrate 10 and the counter substrate 11 are arranged with the display portion spacers 13 dispersed on the display surface so that these electrodes face each other, and then fixed by the sealant 8. In general, a large number of such structures are arranged on the surfaces of the transparent substrate 1 and the counter substrate 6. Thereafter, a large number of display surfaces arranged on the substrate are separated, and liquid crystal is sealed in the gap 12 between the color filter substrate 10 and the counter substrate 11. Next, a polarizing plate is disposed on the upper and lower surfaces, and a lighting device is combined to obtain a color liquid crystal display device.

  FIG. 7 is a schematic plan view of the color filter substrate 10 used in the color liquid crystal display device of this embodiment. The color filter substrate 10 is formed by forming a frame light-shielding layer 2 and a colored layer 3 on the display surface at a certain interval on a transparent substrate 1 such as a glass substrate. FIG. 8 is a schematic cross-sectional view when the color filter substrate 10 and the counter substrate 11 used in the color liquid crystal display device of this embodiment are overlaid. The color filter substrate 10 and the counter substrate 11 are opposed to each other with a certain gap 12 serving as a liquid crystal layer. A transparent electrode 5 and a counter transparent electrode 7 having a desired pattern are provided on one surface of each substrate. The transparent electrode 5 and the counter electrode 7 are formed in a desired pattern by a photolithography method. The transparent electrode 5 and the counter electrode 7 are transparent conductive films called ITO in which indium (In) containing tin (Sn) as an impurity is oxidized, and a desired resistance value can be set. Since ITO is a low-resistance semiconductor material, its resistance value is 10Ω / □ to 100Ω / □, which is the most general-purpose level. Usually, ITO is formed by a vacuum film forming method called a sputtering method or a vapor deposition method. The color filter substrate 10 has a configuration in which a colored layer 3 for forming a color filter is provided on the transparent substrate 1. Specifically, the colored layer 3 having a desired pattern is provided on the surface of the color filter substrate 10 with a thickness of about 1 μm. In FIG. 8, the colored layer 3 is composed of three primary colors of light, red (3R), green (3G), and blue (3B), and the frame light-shielding layer 2 having a desired pattern has a thickness of about 1 μm. Is provided. Further, a colored layer 3 for correcting a step is formed between the adjacent frame light-shielding layers 2 with the same film thickness as the frame light-shielding layer 2. The colored layer 3 for level difference correction is preferably formed at the same time as any of the colored layers (3R, 3G, 3B) in the display surface is formed. A flattening film 4 is provided on the frame light shielding layer 2 and the colored layer 3 with a film thickness of about 2 μm in order to flatten the surface irregularities. A transparent electrode 5 for applying a voltage to the liquid crystal layer 12 is provided thereon. On the other hand, the counter electrode 7 is formed on the counter substrate 11, and after disposing the display portion spacers 13 on the display surface, the color filter substrate 10 and the counter substrate 11 are fixed by the sealant 8 so that these electrodes face each other. A large number of such configurations are arranged on the surfaces of the transparent substrate 1 and the counter substrate 6. Thereafter, the display surfaces arranged in large numbers on the substrate are separated, and liquid crystal is sealed in the gap between the color filter substrate 10 and the counter substrate 11. Next, a color liquid crystal display device is formed by arranging polarizing plates on the upper and lower surfaces and combining the lighting devices.

  With the configuration of each embodiment described above, the outer edge portion of the frame light-shielding layer 2 is not inclined even when a planarizing film is applied upward. Therefore, since there is no difference in cell gap between the seal portion and the display surface, it is possible to provide a color liquid crystal display device with high display quality without display unevenness.

It is a top view which shows typically the structure of the conventional color filter board | substrate. It is sectional drawing which shows the structure of the conventional color liquid crystal display device typically. It is a top view which shows typically the structure of the color filter board | substrate used for this invention. It is sectional drawing which shows typically the structure of the color liquid crystal display device used for this invention. It is a top view which shows typically the structure of the color filter board | substrate used for this invention. It is sectional drawing which shows typically the structure of the color liquid crystal display device used for this invention. It is a top view which shows typically the structure of the color filter board | substrate used for this invention. It is sectional drawing which shows typically the structure of the color liquid crystal display device used for this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transparent substrate 2 Frame light shielding layer 3 Colored layer 4 Flattening film 5 Transparent electrode 6 Counter substrate 7 Counter electrode 8 Sealing agent 9 Step correction layer 10 Color filter substrate 11 Counter substrate 12 Gap 13 Display part spacer

Claims (4)

  A color filter substrate including a colored layer formed corresponding to a display screen, a frame light-shielding layer formed around the colored layer, a counter substrate bonded to the color filter substrate with a sealant, and a color filter substrate A color liquid crystal comprising a liquid crystal layer provided in the gap between the opposing substrates, and a step correction layer having the same thickness as the frame light shielding layer formed on the outer side of the frame light shielding layer on the color filter substrate Display device.   The color liquid crystal display device according to claim 1, wherein the step correction layer is formed by extending the frame light shielding layer.   2. The color according to claim 1, wherein the colored layer includes a plurality of colored layers, and the step correction layer is formed using any one of the colored layers. Liquid crystal display device. A color filter substrate is formed by forming a plurality of layouts on a substrate so that a colored layer corresponding to a display screen of one panel and a frame light shielding layer formed around the display screen correspond to a plurality of panels. Manufacturing process;
Bonding the color filter substrate and the counter substrate with a sealant;
A method of manufacturing a color liquid crystal display device comprising a step of separating the bonded color filter substrate and the counter substrate into individual panels,
A step correction layer having the same film thickness as that of the frame light shielding layer is formed between the frame light shielding layers of the individual panels adjacent on the color filter substrate, and separated into individual panels at the level of the step correction layer. A method for producing a color liquid crystal display device.

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