Vertically aligned liquid crystal display having positive...

Details Vertically aligned liquid crystal display having positive... Vertically aligned liquid crystal display having positive...

2004-01-27

2008-07-08

Caley, Michael H (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S117000, C349S118000, C349S130000

Reexamination Certificate

active

07397524

ABSTRACT:
The present invention relates to a vertically aligned LCD (VA-LCD) comprising a positive compensation film including one or more of a first retardation film (+A-plate) satisfying the condition of nx>ny=nzand a second retardation film (−C-plate) satisfying the condition of nx=ny>nz, wherein the first retardation film is arranged such that its optical axis is perpendicular to an optical absorption axis of a neighboring polarizing plate, and a total thickness retardation (R−C+RVA) including the thickness retardation of the second retardation film and the thickness retardation of a VA-panel has a positive value in then range of 50-150 nm. The VA-LCD in accordance with the present invention improves contrast characteristics on a front surface and at a tilt angle and minimizes coloring in a black state according to the tilt angle.

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PCT International Search Report, PCT/KR2004/000131.

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