Optically compensatory polarizer and liquid-crystal display device
First Claim
1. An optically compensatory polarizer comprising:
- a polarizer including an absorption type polarizing element, and transparent protective layers provided on opposite sides of said absorption type polarizing element, each of said transparent protective layers exhibiting an in-plane retardation of not larger than 10 nm and a thicknesswise retardation in a range of from 30 to 70 nm; and
at least one optically compensating film laminated on at least one of opposite surfaces of said polarizer so that a slow axis of each optically compensating film crosses an absorption axis of said polarizer perpendicularly, said optically compensating film exhibiting an in-plane retardation in a range of from 80 to 200 nm and Nz=(nx−
nz)/(nx−
ny) in a range of from −
0.2 to 0.2 in which nz is a refractive index in a direction of a Z axis expressing a direction of the thickness of said optically compensating film, nx is a refractive index in a direction of an X axis expressing a direction of said optically compensating film in a sheet plane perpendicular to said Z axis, ny is a refractive index in a direction of a Y axis expressing a direction of said optically compensating film perpendicular both to said Z axis and to said X axis, and nx and ny satisfy the relation nx>
ny.
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Accused Products
Abstract
An optically compensatory polarizer has a polarizer and an optically compensating film. The polarizer includes an absorption type polarizing element and transparent protective layers provided on opposite sides of the absorption type polarizing element, each of the transparent protective layers exhibiting an in-plane retardation of not larger than 10 nm and a thicknesswise retardation in a range of from 30 to 70 nm. The optically compensating film is laminated on one or each of opposite surfaces of the polarizer so that a slow axis of each optically compensating film crosses an absorption axis of the polarizer perpendicularly, and exhibits an in-plane retardation in a range of from 80 to 200 nm and Nz=(nx−nz)/(nx−ny) in a range of from −0.2 to 0.2 and nx and ny satisfy the relation nx>ny.
16 Citations
2 Claims
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1. An optically compensatory polarizer comprising:
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a polarizer including an absorption type polarizing element, and transparent protective layers provided on opposite sides of said absorption type polarizing element, each of said transparent protective layers exhibiting an in-plane retardation of not larger than 10 nm and a thicknesswise retardation in a range of from 30 to 70 nm; and
at least one optically compensating film laminated on at least one of opposite surfaces of said polarizer so that a slow axis of each optically compensating film crosses an absorption axis of said polarizer perpendicularly, said optically compensating film exhibiting an in-plane retardation in a range of from 80 to 200 nm and Nz=(nx−
nz)/(nx−
ny) in a range of from −
0.2 to 0.2 in which nz is a refractive index in a direction of a Z axis expressing a direction of the thickness of said optically compensating film, nx is a refractive index in a direction of an X axis expressing a direction of said optically compensating film in a sheet plane perpendicular to said Z axis, ny is a refractive index in a direction of a Y axis expressing a direction of said optically compensating film perpendicular both to said Z axis and to said X axis, and nx and ny satisfy the relation nx>
ny. - View Dependent Claims (2)
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Specification
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- Resources
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Current AssigneeNitto Denko Corporation
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Original AssigneeNitto Denko Corporation
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InventorsUmemoto, Seiji, Yano, Shuuji
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Primary Examiner(s)Chowdhury, Tarifur R.
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Assistant Examiner(s)Wang, George Y.
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Application NumberUS10/084,054Publication NumberTime in Patent Office1,258 DaysField of Search349117-120US Class Current349/117CPC Class CodesG02F 1/133528 PolarisersG02F 1/133634 the refractive index Nz per...
