Liquid crystal display device with a birefringent compensator

Details Liquid crystal display device with a birefringent compensator Liquid crystal display device with a birefringent compensator

1990-02-05

1991-05-21

Miller, Stanley D.

350337, G02F 1133

Patent

active

050169882

ABSTRACT:
Disclosed herein is a liquid crystal display device comprising (1) a liquid crystal cell having a structure in which liquid crystal molecules in the liquid crystal layer sandwiched between substrates are oriented substantially in parallel to the surface of the substrate and twisted at an angle of from 120.degree. to 360.degree. in the thickness direction of the liquid crystal layer when the voltage is not applied, (2) a pair of polarizers disposed so as to sandwich the liquid crystal cell therebetween and (3) a birefringence layer disposed between the liquid crystal layer and at least one of the polarizers. The liquid crystal display device can provide black and white display of excellent visual angle characteristic and of excellent quality. Furthermore, the maximum, minimum, and perpendicular refractive indexes, n.sub.x, n.sub.y, and n.sub.z, respectively, of the birefringence layer satisfy the following relationship:

REFERENCES:
patent: 4586790 (1986-05-01), Umeda et al.
patent: 4813770 (1989-03-01), Clerc et al.
patent: 4844569 (1989-07-01), Wada et al.
patent: 4889412 (1989-12-01), Clerc et al.
patent: 4957349 (1990-09-01), Clerc et al.

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