Gray scale liquid crystal display having a wide viewing angle

Details Gray scale liquid crystal display having a wide viewing angle Gray scale liquid crystal display having a wide viewing angle

1993-03-03

1995-04-25

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 75, 359 99, 359 63, 359 93, G02F 11335, G02F 1137

Patent

active

054104220

ABSTRACT:
A gray scale LCD cell device (116) combines a liquid crystal cell (80) having a symmetrical director field (82, 82') with a negative birefringence compensator plate (110) and interposes them between a pair of linear polarizers (112, 114). The symmetrical director field produces a symmetrical but nonuniform gray scale or color viewing circle curve (100) from the liquid crystal cell. The negative birefringence plate restores the gray scale or color viewing angle uniformity. When graphed on a polar plot, the measured light transmission percentage curves (120, 122, 124) characterizing the LCD are substantially concentric circles surrounding the optical axis (18) for all azimuthal angles (28) and viewing angles (24) up to 30 degrees. Adding colored filters (152) to a color cell triad (150) provides a basis for a multi-color display having uniformly perceived colors over a wide range of azimuthal and viewing angles.

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