Negative optical compensator tilted in respect to liquid crystal

Details Negative optical compensator tilted in respect to liquid crystal Negative optical compensator tilted in respect to liquid crystal

1993-04-30

1999-11-16

Parker, Kenneth

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349 84, 349118, G02F 11335

Patent

active

059867337

ABSTRACT:
A normally white liquid crystal display includes polarizer and analyzer layers having perpendicular absorbing axes. A liquid crystal layer is disposed between the polarizer layer and the analyzer layer, with its director exhibiting an azimuthal twist through the layer. First and second electrodes are proximate to first and second major surfaces of the liquid crystal layer. A first negatively birefringent compensator layer, oriented with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state, is disposed between the polarizer layer and the liquid crystal layer. A second negatively birefringent compensator layer, with a birefringence substantially the same as the birefringence of the first compensator layer and oriented with its optical axis substantially parallel to the optical axis of the first compensator layer, is disposed between the analyzer layer and the liquid crystal layer.

REFERENCES:
patent: 4701028 (1987-10-01), Clerc et al.
patent: 4889412 (1989-12-01), Clerc et al.
patent: 5124824 (1992-06-01), Kozaki et al.
patent: 5194975 (1993-03-01), Akatsuka et al.
patent: 5196853 (1993-03-01), Yeh et al.
patent: 5291323 (1994-03-01), Ohnishi et al.

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