Liquid crystal display device

Details Liquid crystal display device Liquid crystal display device

2006-10-10

2006-10-10

Dudek, James A. (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S118000, C349S119000

Reexamination Certificate

active

07119866

ABSTRACT:
A positive uniaxial film14with a retardation of Rp [nm] in an in-plane direction is provided between a vertical alignment mode liquid crystal cell11and a polarizing plate12,and a negative uniaxial film15with a retardation of Rn [nm] in a thickness direction is provided between the liquid crystal cell11and a polarizing plate13.Further, when a parameter α1[nm] relative to Rp is: α1=135−0.7×Rtac; and a parameter β1[nm] relative to Rn is: β1=Rlc−6−1.4×Rtac, where Rtac [nm] is a retardation in a thickness direction of the respective triacetyl cellulose films12band13bof polarizing plates12and13,the retardation Rp is set to be a value ranging from 80% to 120% of the parameter α1, and the retardation Rn is set to be a value ranging from 60% to 90% of the parameter β1. This makes it possible to surely provide a vertical alignment mode liquid crystal display device which can maintain a contrast with a sufficiently high value in practical use when viewed from an oblique direction and limit the coloring and tone degradation within a tolerance level.

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U.S. Appl. No. 10/377,660 filed Mar. 4, 2003 entitled “Liquid Crystal Display Device”.
Japanese Office Action mailed Oct. 18, 2005 (w/English Translation thereof).

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