JP2007240908A - Manufacturing method for color filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a color filter which can have its surface flattened. <P>SOLUTION: The manufacturing method for the color filter includes the processes of: forming a grating-shaped black matrix layer (12) on a surface of a glass substrate (11) and also forming an outer circumferential layer (12a) forming an outer circumferential frame part of a display screen; forming color filter layers (13) of red, green, and blue as pixels between grating patterns of the black matrix layer (12) and also forming narrow-width projection parts (14) of the same material with the color filter layers (13) on the surface of the outer circumferential layer (12a); and forming an overcoat layer (15) of an acrylic resin material on the black matrix layer (12), the color filter layers (13), the outer circumferential layer (12a) provided with the projection parts (14), and the surface of the glass substrate (11) where they are not formed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for producing a color filter provided on a glass substrate of a color display device.

Conventionally, a color filter is used for color display of a liquid crystal display device or the like. For example, as shown in FIG. 4, the color filter 1 has a lattice-like black matrix layer 3 formed on the surface of a glass substrate 2, and red (R) and green are formed between the lattice patterns of the black matrix layer 3. A color filter layer 4 of (G) and blue (B) is formed, and a transparent overcoat layer 5 that covers the surfaces of the blank matrix layer 3 and the color filter layer 4 is used. This color filter 1 is formed with an outer peripheral layer 3a simultaneously with the formation of the black matrix layer 3 in order to form an outer peripheral frame portion of the display screen. A plurality of them are manufactured adjacent to each other. The applicant has disclosed a technique relating to a color filter for liquid crystal that can reduce the resistance of a transparent electrode formed on a glass substrate at low cost and a method for manufacturing the same (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 10-62771 (pages 2 to 4, FIGS. 1 to 4).

  As shown in FIG. 4, in the conventional color filter, the portion where the black matrix layer 3 and the color filter layer 4 are in contact with each other is formed so that there is no gap, so that the color filter layer 4 is surrounded around the black matrix layer 3. Are formed to overlap each other, and a slightly protruding portion is formed in the overlapping portion. Therefore, the surface of the overcoat layer 5 is also formed in a shape reflecting the protruding portion. Moreover, as shown in FIG. 4, the outer peripheral layer 3a is formed in a shape that is inclined toward the periphery, and a portion that is lowered by a dimension H of, for example, about 0.1 μm to 0.2 μm is formed in the periphery. There was a thing. Such protruding portions or lowered portions of the color filter may adversely affect the subsequent manufacturing process.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a method of manufacturing a color filter that can flatten the surface.

  In order to achieve the above object, in the first aspect of the present invention, a process of forming a lattice-like black matrix layer on the surface of the glass substrate and forming an outer peripheral layer serving as an outer peripheral frame portion of the display screen And a red, green and blue color filter layer to be a pixel between the lattice patterns of the black matrix layer, and a narrow protrusion having the same material as the color filter layer on the surface of the outer peripheral layer. Forming a black matrix layer, a color filter layer, a peripheral layer provided with a protrusion, and a step of forming an overcoat layer made of an acrylic resin material on the surface of the glass substrate on which these are not formed It is characterized by having. The surface of the overcoat layer can be flattened as a display device by forming a narrow protrusion having the same material as that of the color filter layer on the surface of the outer peripheral layer.

  In the invention described in claim 2, a lattice-like black matrix layer is formed on the surface of the glass substrate, and the outer peripheral layer serving as the outer peripheral frame portion of the display screen is continuously formed with other adjacent outer peripheral layers. A step of forming, a step of forming red, green and blue color filter layers to be pixels between the lattice patterns of the black matrix layer, and an acrylic system on the surfaces of the black matrix layer, the color filter layer, and the outer peripheral layer. And a step of forming an overcoat layer made of the above resin material. The surface of the overcoat layer can be flattened by continuously forming the outer peripheral layer serving as the outer peripheral frame portion of the display screen with other adjacent outer peripheral layers.

  In the invention of claim 3, a step of forming a grid-like black matrix layer on the surface of the glass substrate and forming an outer peripheral layer serving as an outer peripheral frame portion of the display screen; and A red, green and blue color filter layer to be a pixel is formed between lattice patterns, and the glass substrate surface between other outer peripheral layers adjacent to the outer peripheral layer is made of the same material as the color filter layer. And a step of forming a flat layer. By forming a flat layer on the glass substrate surface between other outer peripheral layers adjacent to the outer peripheral layer, the surface of the overcoat layer can be made flat.

  The process of forming a grid-like black matrix layer on the surface of the glass substrate and forming the outer peripheral layer that becomes the outer peripheral frame portion of the display screen, and red, green, and blue that become pixels between the grid patterns of the black matrix layer Forming a color filter layer, and forming a narrow-width projection made of the same material as the color filter layer on the surface of the outer peripheral layer, a black matrix layer, a color filter layer, an outer peripheral layer provided with the protrusion, And a step of forming an overcoat layer made of an acrylic resin material on the surface of the glass substrate on which these are not formed, the surface of the overcoat layer used as a display device can be flattened.

  Hereinafter, the present invention will be specifically described with reference to an illustrated embodiment. FIG. 1 is a diagram for explaining a manufacturing process of a color filter for liquid crystal according to the first embodiment of the present invention.

  First, as shown in FIG. 1A, a black matrix layer 12 having a thickness of about 1 μm made of, for example, a resin material that is a black film is formed on the surface of a glass substrate 11. Next, as shown in FIG. 1B, patterning is performed to form a lattice pattern as the black matrix layer 12. Around the black matrix layer 12, a slightly wider outer peripheral layer 12 a is formed of the same black film in order to form an outer peripheral frame portion of the display screen. At the same time, a similar black matrix layer 12 and outer peripheral layer 12a are formed on one glass substrate 11 so as to be adjacent to each other at a constant interval.

  Next, as shown in FIG. 1C, three color filters of red (R), green (G), and blue (B) serving as pixels are provided between the lattice patterns of the lattice-like black matrix layer 12. The layer 13 (a, b, c) is formed to a thickness of about 1 μm by, for example, a dispersion method, a dyeing method, a printing method, or an electrodeposition method. At the same time as the formation of the color filter layer 13 (a, b, c), a projection 14 having a narrow width is formed on the upper surface of the outer peripheral layer 12a. The protrusions 14 may be, for example, any one of red (R), green (G), and blue (B), or other materials. In the embodiment, three protrusions 14 are provided near the periphery of the outer peripheral layer 12a. Although formed, any number may be formed according to the width of the outer peripheral layer 12a. Next, as shown in FIG. 1D, the black matrix layer 12, the color filter layer 13 (a, b, c) formed in the above process, the outer peripheral layer 12a provided with the protrusions 14, and these are On the surface of the glass substrate 11 that is not formed, for example, a transparent overcoat layer 15 made of an acrylic resin material is formed to a thickness of about 2.5 μm.

  In the color filter 10 formed by the above process, the color filter layer 13 (a, b, c) is formed around the lattice of the black matrix layer 12, and a slightly protruding portion is formed in the overlapping portion. The surface of the overcoat layer 15 is formed in a slightly protruding shape to reflect the protruding portion, but the size of the protrusion was as small as about 0.05 μm. Further, the surface of the overcoat layer 15 formed on the upper part of the outer peripheral layer 12a is also formed with a protrusion reflecting the protrusion 14, but it does not have an inclined shape as in the prior art and is used as a display device. The region could be formed flat as a whole. It was confirmed that the provision of the protrusions 14 can alleviate the influence of the sudden step of the overcoat layer 15 formed on the surface of the glass substrate 11 from the periphery of the outer peripheral layer 12a. In the color filter 10 in which the surface of the overcoat layer 15 is formed flat, the wiring formed in the subsequent process can be formed thinly and uniformly, the resistance value can be lowered, thinning can be achieved, and the adhesiveness can be reduced. In addition, the orientation angle of the liquid crystal becomes uniform and the display quality can be improved.

  FIG. 2 is a diagram for explaining a color filter for liquid crystal according to a second embodiment of the present invention. In addition, the part and member corresponding to 1st Embodiment write the same code | symbol, and abbreviate | omit detailed description.

  In the color filter 20 of this embodiment, the black matrix layer 12 and the color filter layer 13 (a, b, c) are formed on the surface of the glass substrate 11 as in the first embodiment, and the black matrix layer 12 is further formed. At the same time, the outer peripheral layer 12a is formed together with the adjacent outer peripheral layer 12a, and the overcoat layer 15 is formed on the surfaces of the black matrix layer 12, the color filter layer 13 (a, b, c), and the outer peripheral layer 12a.

  In the color filter 20 formed by the above process, the black matrix layer 12, the color filter layer 13 (a, b, c), and the outer peripheral layer 12a on the surface of the glass substrate 11 have a uniform film thickness together with the adjacent outer peripheral layer 12a. As a result, the surface before the overcoat layer 15 is formed becomes flat, and the influence of the step is eliminated, and the surface of the overcoat layer 15 can be formed flat.

  FIG. 3 is a diagram for explaining a color filter for liquid crystal according to a third embodiment of the present invention. In addition, the part and member corresponding to 1st Embodiment write the same code | symbol, and abbreviate | omit detailed description.

  In the color filter 30 of this embodiment, the black matrix layer 12 and the color filter layer 13 (a, b, c) are formed on the surface of the glass substrate 11 as in the first embodiment, and the color filter layer 13 (a, Simultaneously with the formation of b, c), any flat layer 16 of red (R), green (G) and blue (B) on the surface of the glass substrate 11 between the adjacent outer peripheral layers 12a has a film thickness of about 1 μm. The overcoat layer 15 is formed on the surfaces of the black matrix layer 12, the color filter layer 13 (a, b, c), the outer peripheral layer 12 a, and the flat layer 16.

  In the color filter 30 formed by the above process, since the flat layer 16 is formed on the surface of the glass substrate 11 with the same film thickness as the outer peripheral layer 12a, the surface before the overcoat layer 15 is formed becomes flat. The surface of the overcoat layer 15 could be formed flat without any influence of the step.

  In each of the above embodiments, the color filter for liquid crystal display has been described as an example. However, for example, it can be used for a color filter for EL (electroluminescence) display.

  The present invention can be used in a method for manufacturing a color filter provided on a glass substrate of a color display device.

It is a figure explaining the manufacturing process of the color filter for liquid crystals of 1st Embodiment of this invention. It is a figure explaining the structure of the color filter for liquid crystals of 2nd Embodiment of this invention. It is a figure explaining the structure of the color filter for liquid crystals of 2nd Embodiment of this invention. It is a figure explaining the structure of the conventional color filter for liquid crystals.

Explanation of symbols

10, 20, 30 Color filter 11 Glass substrate 12 Black matrix layer 12a Outer peripheral layer 13a, 13b, 13c Color filter layer 14 Protrusion 15 Overcoat layer 16 Flat layer

Claims (3)

A step of forming a black matrix layer in the form of a lattice on the surface of the glass substrate and forming an outer peripheral layer serving as an outer peripheral frame portion of the display screen, and red, green, and pixels serving as pixels between the lattice patterns of the black matrix layer Forming a blue color filter layer and forming a narrow-width projection made of the same material as the color filter layer on the surface of the outer peripheral layer; and providing the black matrix layer, the color filter layer, and the projection And a step of forming an overcoat layer made of an acrylic resin material on the surface of the glass substrate on which these are not formed. Forming a grid-like black matrix layer on the surface of the glass substrate, and continuously forming an outer peripheral layer as an outer peripheral frame portion of the display screen with other adjacent outer peripheral layers; and a lattice pattern of the black matrix layer A step of forming red, green and blue color filter layers to be pixels between, and a step of forming an overcoat layer made of an acrylic resin material on the surfaces of the black matrix layer, the color filter layer, and the outer peripheral layer A method for producing a color filter, comprising: A step of forming a black matrix layer in the form of a lattice on the surface of the glass substrate and forming an outer peripheral layer serving as an outer peripheral frame portion of the display screen, and red, green, and pixels serving as pixels between the lattice patterns of the black matrix layer Forming a blue color filter layer and forming a flat layer made of the same material as the color filter layer on the glass substrate surface between other outer peripheral layers adjacent to the outer peripheral layer. A method for producing a color filter. .

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