Wide viewing angle polarizer and liquid-crystal display device

USRE41679E1Inactive Publication Date: 2010-09-14NITTO DENKO CORP
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
NITTO DENKO CORP
Publication Date
2010-09-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

A wide viewing angle polarizer having: a polarizing film; and a phase retarder adhesively laminated on at least one surface of the polarizing film through an adhesive layer, the phase retarder being made of a composite phase retarder constituted by a laminate in which a retardation layer B of a cholesteric liquid crystal-oriented solidified layer in a selective reflection wavelength range of not larger than 350 nm is supported by a retardation layer A of a thermoplastic resin exhibiting positive birefringence, the composite phase retarder being formed so that the laminate has Re of not smaller than 10 nm and Rth−Re of not smaller than 50 nm when Re and Rth are defined as Re=(nx−ny)X d and Rth=(nx−nz)X d respectively in which nx and ny are in-plane main refractive indices, nz is a thicknesswise refractive index, and d is a layer thickness. A liquid-crystal display device having: a liquid-crystal cell; and a wide viewing angle polarizer defined above and disposed on at least one surface of the liquid-crystal cell.
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Description

[0001] The present application is based on Japanese Patent Application No. 2001-312162, which is incorporated herein by reference.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to a wide viewing angle polarizer adapted for improvement in viewing angle characteristic of a liquid-crystal display device such as a vertical aligned (VA) liquid-crystal display device.

[0004] 2. Description of the Related Art

[0005] To form a liquid-crystal display device exhibiting excellent display quality in all azimuths by compensation for birefringence of a liquid-crystal cell achieving display through a polarizer, the polarizer needs to be combined with a phase retarder in which main refractive indices nx, ny and nz in three directions, that is, two in-plane directions x and y in association an obliquely viewing direction and one normal direction z, are controlled. Particularly in a VA or OCB liquid-crystal display device, the polarizer needs to be combined w...

Claims

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