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Laminated phase resistant film and liquid crystal display device using said film

A technology of liquid crystal and retardation value, applied in the field of liquid crystal display, which can solve the problem that the biaxial stretching equipment cannot make the uniformity of retardation value, etc.

Inactive Publication Date: 2003-11-26
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to produce a large number of phase retardation films with a large enough area and suitable for liquid crystal displays with this experimental equipment. Directional consistency and surface characteristics (no scratches) in a large area to meet the requirements of liquid crystal displays
Even if uniformity is obtained over large areas using conventional stretching equipment for making phase retardation films for LCDs, only a very limited range of biaxial alignments can be achieved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0031] Example (A) Organoclay compound

[0032] Produced by CO-op CHEMICAL CO., Ltd, the brand name is "LUCENTITESTN", which is composed of synthetic hectorite (hectorite) and a quaternaryammonium compound (quaternaryammonium compound), which still has excellent performance in highly polar solvents. dispersion.

[0033] The brand name "LUCENTITE STN" is composed of synthetic hectorite and a tetraammonium compound, which still has excellent dispersibility in non-polar solvents. (B) Hydrophobic resin

[0034] Produced by CO-op CHEMICAL CO., Ltd under the trade name "Denka Butyral #3000-k" is an aldehyde resin of polyvinyl alcohol.

[0035] Manufactured by TOAGOSEI CO., Ltd under the trade name "ARON S1601" is an acrylic resin mainly composed of butyl acrylate.

[0036] Manufactured by Shin-Nakamura Chemical CO., Ltd. under the trade name "Vanaresin MKV-115" is a methacrylic resin mainly composed of dicyclopentanyl methacrylate.

[0037] Then, the measurement and evaluation ...

Embodiment 1

[0047] A triacetyl cellulose film (trade name "KONIC TAC KC80CA", made by KONICA Company) with a film thickness of 80 microns was drawn through a pair of rollers in the longitudinal uniaxial arrangement direction to obtain a R 0B = 25nm and R' B = 56 nm basement membrane. This base film was continuously coated using a comma coater, an organic solvent dispersion solution including 2.50% polyvinyl alcohol (polyvinyl alcohol) aldehyde (aldehyde) resin "Denka Butyral #3000-k", 5.63% organoclay compound" LUCENTITE STN", 1.87% organoclay compound "LUCENTITE SPN", 63.0% toluene, 18.0% methylene chloride and 9.0% acetone to set the film thickness after drying is set at 10 µm, so a R 0C = 0 nm and R' C A coating layer of = 122 nm was laminated on top. one with R 0 = 25 nm and R' = 178 nm optical properties of the laminated phase retardation film was prepared.

Embodiment 2

[0049] The same as in Example 1 and a triacetyl cellulose film with a film thickness of 80 microns is drawn through the pair of rollers in the longitudinal uniaxial arrangement direction to obtain a R 0B = 22nm and R' B = 40 nm basement membrane. This base film is continuously coated with a comma coater, and an organic solvent dispersion solution includes resin and organoclay compound, and its composition is the same as that of Example 1, so that the film thickness after drying is set to 10 microns, such a R 0C = 0 nm and R' C = 95nm coating layer is laminated on top, and then formed with R 0 = 22 nm and R' = 135 nm optical properties of the laminated phase retardation film.

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Abstract

The objective of the present invention is to provide a laminated phase retarder film that is superior in evenness, exhibits a biaxial optical property as a whole, and makes it possible to set the biaxial optical property over a wide range and a LCD used same. This object is achieved by a laminated phase retarder film comprising a transparent resin film as a substrate and at least one coat layer having a refractive-index anisotropy laminated on at least one surface of the substrate, wherein a in-plane retardation value (R0) is not less than 20 nm, a retardation value (R') in the film-thickness direction, which is calculated from a retardation value (R40) measured by inclining by 40 degrees around the slow axis of the film and the in-plane retardation value (R0), is greater than 40 nm.

Description

technical field [0001] The present invention relates to a kind of laminated phase retarder film (laminated phase retarder film), in order to improve the viewing angle (viewing angle) of liquid crystal display, and is related to a kind of liquid crystal display ( liquid crystal display). Background technique [0002] Liquid crystal displays have been widely used in small-sized components to flat-panel displays with large display capacity. However, the viewing angle characteristics of these liquid crystal displays deteriorate the display characteristics when viewed from an angle; for example, a decrease in contrast or a gray-scale inversion in which luminance is reversed into gray-scale occurs. Therefore, there is a great need to solve these problems. [0003] Recently, a vertically aligned (VA) nematic-type liquid crystal display system has been developed for improving these viewing angle characteristics, such as disclosed in Japanese Patent No. 2548979. Just like pages 84...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04G02B5/30G02F1/13363G02F1/139
CPCG02F1/133634G02B5/3083G02F1/1393C09K2323/00C09K2323/025Y10T428/25Y10T428/252Y10T428/31507Y10T428/31667G02F1/13363
Inventor 清水朗子
Owner SUMITOMO CHEM CO LTD
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