Liquid crystal display device with compensating film(s)

Details Liquid crystal display device with compensating film(s) Liquid crystal display device with compensating film(s)

1998-05-27

2000-03-07

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349117, 349119, 349121, G02F 11335

Patent

active

060347546

ABSTRACT:
Provided is a liquid crystal display device of a TN type which is improved on a display contrast, gray scale characteristics and viewing angle characteristics of a display color. A liquid crystal cell of a TN type for drive is sandwiched by a pair of upper and lower polarizing plates and at least one compensating film which has an extinction axis angle of 5 to 90 degrees as an absolute value and an optical rotating angle of 0.5 to 10 degrees as an absolute value, wherein signs of the extinction axis angle and the optical rotating angle are contrary to each other, is inserted between the liquid crystal cell and the upper polarizing plate, or between the liquid crystal cell and the lower polarizing plate, or at least two compensating films are respectively inserted between the liquid crystal cell and the upper polarizing plate, and between the liquid crystal cell and the lower polarizing plate, wherein a quasi fast axis vector of a compensating film and an easy axis vector of an electrode substrate nearer the compensating film of the liquid crystal cell satisfy an angular relation therebetween in the range of -30 to +30 degrees or +150 to +210 degrees.

REFERENCES:
patent: 5184236 (1993-02-01), Miyashita et al.
patent: 5212819 (1993-05-01), Wada
patent: 5493431 (1996-02-01), Baba et al.
patent: 5646703 (1997-07-01), Kamada et al.
patent: 5667854 (1997-09-01), Yamada
patent: 5736067 (1998-04-01), Kawata et al.
patent: 5793455 (1998-08-01), Nakamura
patent: 5855971 (1999-01-01), Kobori et al.

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