Optical film and image viewing display

Details Optical film and image viewing display Optical film and image viewing display

2004-09-13

2008-12-16

Caley, Michael H (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S117000, C349S119000

Reexamination Certificate

active

07466381

ABSTRACT:
An optical film (3) of the invention comprises a polarizing Plate (1), in which a transparent protective film (1b) is laminated on both sides of a polarizer (1a), and plural retardation films (2) so that an absorption axis of the polarizing plate (1) is perpendicular or parallel to slow axes of the plural retardation films (2) and the slow axes of the plural retardation films (2) are parallel to one another. An Nz value expressed by Nz=(nx1−nz1)/(nx1−ny1) is in the range of from 0.15 to 0.85 and an in-plane retardation Re1expressed by Re1=(nx1−ny1)×d1is in the range of from 200 to 350 nm, where in each of the plural retardation films, a direction along with the refractive index in the film plane is maximum is defined as the X-axis, a direction perpendicular to the X-axis as the Y-axis, the thickness direction of the film as the Z-axis, and where refractive indices in each axial direction are defined as nx1, ny1, and nz1, respectively, and the thickness of the film as d1(nm). The optical film may realize an easily viewable display with high contrast ratio in a wide range and may provide a retardation value stabilized under conditions of high temperature or high humidity.

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Office Action of Corresponding Chinese Patent Application No. 200480026672.4 issued Aug. 17, 2007.
Japanese Office Action dated Feb. 14, 2008, issued in corresponding Japanese Patent Application No. 2003-333601.

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