Planarizing sheet and process for preparation of color filter using the same

Abstract

The present inventoin provides a flattening sheet successively laminated releasing layer, substrate layer and elastic layer, the releasing layer has <=30 mN / m surface tension (23[deg.]C) and <=20 nm arithmetic average roughness R<SB>a< / SB>in a roughness curve, a base material layer which is a surface of the releasing layer side and has <=50 nm arithmetic average roughness R<SB>a< / SB>in a roughness curve and an elastic layer having 0.5-20 MPa elastic modulus (23[deg.]C) and 0.1-5 mm thickness. The flattening sheet is capable of uniformly flattening the whole transparent resin layer, preventingtransparent ink forming the transparent resin layer from reversely being transferred and hardly causing defect on the transparent resin layer due to the incorporation of foreign matter and a method of manufacturing a color filter using the flatening sheet. The method of manufacturing is carried out by rolling a roller 7 on which the flattening sheet 6 is wound and fixed so that the releasing layer exists outside to be in contact with the surface of the transparent resin layer 5 formed on a substrate 1 to flatten the surface.

Description

technical field [0001] The present invention relates to a flattening sheet for converting the above-mentioned transparent resin layer by bringing it into contact with the surface of at least partly colored transparent resin layer constituting the color filter, and a method of manufacturing a color filter using the above-mentioned flattening sheet. The surface of the resin layer is flattened. Background technique [0002] A color filter used in a flat panel display such as a liquid crystal display (LCD) is manufactured by regularly arranging and printing a stripe pattern corresponding to each pixel on a transparent substrate to form a transparent resin layer. The coloring is formed by corresponding to the transparent inks of the respective colors of red (R), green (G), and blue (B) pixels constituting the above-mentioned liquid crystal display or the like. [0003] However, the stripe patterns of each color formed by printing the transparent ink colored in the above-mentione...

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Problems solved by technology

[0003] However, the stripe patterns of each color formed by printing the transparent ink colored in the above-mentioned colors by various printing methods have a surface that is low at both ends of the stripe and high at the center due to the surface tension of the transparent ink. Therefore, the surface of the transparent resin layer, which is a collection of stripe patterns of each color, forms a concavo-convex shape corresponding to the protruding shape of the above-mentioned stripe pattern, and there is a problem that the contrast of the display is lowered due to the diffuse reflection of light caused by the above-mentioned concavities and convexities. , or such as in the case of an LCD when uneven response of the liquid crystal occurs

[0011] However, in the case of using the same roll wound with an offset blanket as that used when printing a stripe pattern by the lithographic offset printing method described in H02-297502A (1990), it is considered that the offset blanket may be The transparent ink from the plate is well received and transferred to the surface of the substrate well, and the wettability of the surface to the transparent ink and the softness as a whole are set, so there is the following problem: The transparent ink of the transparent resin layer is reverse-printed on the surface of the offset printing tape, causing defects such as recesses on the transparent resin layer, or the transparent resin layer is easily damaged, and it is difficult to uniformly flatten the entire transparent resin layer

[0012] In addition, when using metal rolls or the like after the outer peripheral surface has been released from the mold described in H08-075914A (1996) and H08-234013A (1996), the above-mentioned metal rolls are too hard and cannot be flexibly adapted to the thickness of the transparent resin layer. deviation, etc., so there is still a problem that the entire transparent resin layer is difficult to be flattened uniformly

In addition, there is also a problem that the release process of the outer peripheral surface of the above-mentioned metal roller or the like is deteriorated, and when the transparent ink forming the transparent resin layer becomes easily reverse-printed on the above-mentioned outer peripheral surface, the whole must be replaced.

[0014] However, it has also been clarified that as the above-mentioned planarizing sheet, it has the same structure as a conventional offset printing blanket, and only slightly adjusted the characteristics such as the wettability of the contact surface to the transparent ink and the flexibility as a whole. In the case of the flattening sheet, especially when the flattening sheet is wound and fixed on the outer peripheral surface of the roll, when foreign matter or the like is sandwiched between the two, the shape of the foreign matter is clearly present as a protrusion in the contact of the flattening sheet. On the flattened transparent resin layer, defects such as recesses corresponding to the above-mentioned protrusions are likely to occur.

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