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Retardation film and a liquid-crystal display device comprising the same

A liquid crystal display device and retardation film technology, applied in the field of retardation films, can solve the problems of non-perpendicular optical axes and light leakage, and achieve the effects of low photoelastic coefficient, excellent heat resistance and excellent optical properties

Inactive Publication Date: 2011-10-12
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, light does not pass through the front faces of the two polarizers that are perpendicular to each other, but if the angle is tilted, the optical axes of the two polarizers are not perpendicular to each other, and light leakage occurs

Method used

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  • Retardation film and a liquid-crystal display device comprising the same
  • Retardation film and a liquid-crystal display device comprising the same

Examples

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Embodiment 1

[0070] A resin was prepared by using 90 parts by weight of a copolymer of methyl methacrylate (80 parts by weight) and cyclohexyl methacrylate (20 parts by weight) and 10 parts by weight of polycarbonate. The glass transition temperature and molecular weight of the prepared resin were measured, and as a result, a resin having a glass transition temperature of 122° C. and a molecular weight of 110,000 was obtained. A film was produced from the resin using a solution casting method, and the film was stretched at a glass transition temperature, and then the retardation value of the film was measured. As a result, the in-plane retardation value / thickness retardation value were 37 nm / -75 nm.

Embodiment 2

[0072] A resin was prepared by using 90 parts by weight of a copolymer of methyl methacrylate (90 parts by weight) and cyclohexyl methacrylate (10 parts by weight) and 10 parts by weight of polycarbonate. The glass transition temperature and molecular weight of the prepared resin were measured, and as a result, a resin having a glass transition temperature of 121° C. and a molecular weight of 130,000 was obtained. A film was produced from the resin using a solution casting method, and the film was stretched at a glass transition temperature, and then the retardation value of the film was measured. As a result, the in-plane retardation value / thickness retardation value were 32 nm / -64 nm.

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Abstract

The present invention relates to a retardation film comprising: 1) an acrylic copolymer resin comprising an alkyl methacrylate based monomer and a cycloalkyl methacrylate based monomer; and 2) a resin blend of resins comprising an aromatic ring or an aliphatic ring on the polymer main chain. The present invention also relates to a production method for the retardation film, and to a liquid crystal display device comprising the retardation film. The retardation film according to the present invention has outstanding properties including heat resistance, optical transparency, mechanical strength and durability.

Description

technical field [0001] The present invention provides a retardation film, a method of manufacturing the retardation film and a liquid crystal display device comprising the retardation film, wherein the retardation film has excellent heat resistance and optical transparency, low haze, and is not easily broken , and has excellent mechanical strength and durability. [0002] This application claims priority from Korean Patent Application No. 10-2008-0119610 filed in the Korean Intellectual Property Office (KIPO) on Nov. 28, 2008, the disclosure of which is incorporated herein by reference in its entirety. Background technique [0003] Recently, with the development of optical technology, display technologies using various methods such as plasma display panel (PDP) and liquid crystal display (LCD), etc., which are used to replace the known brown tube (brown tube) have been proposed and sold . Higher performance is required for polymer materials used in displays. For example, ...

Claims

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Application Information

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IPC IPC(8): G02F1/13363G02F1/1335
CPCC08J5/18C08L33/12G02B1/04G02B5/3083C08L2203/16C08J2469/00C08J2333/12G02F2202/40G02F1/133634G02F1/133635C08L69/00C08J2333/10C08L33/10
Inventor 田炳圭韩昌薰姜秉逸金受庆成多恩
Owner LG CHEM LTD