Reflective liquid crystal display device

Details Reflective liquid crystal display device Reflective liquid crystal display device

2000-01-07

2000-11-07

Dudek, James A.

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349113, 349121, G02F 11335

Patent

active

061444324

ABSTRACT:
A reflective liquid crystal display device employing only one sheet of polarizer film, the liquid crystal display device comprising: a liquid crystal cell comprising liquid crystal sealed between a pair of substrates, a polarizer film, two sheets of retardation film, a scattering film, and a specular reflector. The twisting angle of the liquid crystal is between 220.degree. and 260.degree.. The retardation .DELTA.nLC.multidot.dLC of the liquid crystal is between 700 nm and 1000 nm, and the retardation of the retardation films is .vertline.Rfilm(2)-Rfilm(1).vertline..ltoreq.200 nm. A specific angular relationship is established among the alignment of the liquid crystal molecules, the slow axis of the two sheets of retardation film, and the absorption axis of the polarizer. This configuration provides the reflective liquid crystal display device with a bright white display, an achromatic black and white display with high contrast, and less dependence on viewing angle.

REFERENCES:
patent: 5737047 (1998-04-01), Sakamoto et al.
patent: 5798809 (1998-08-01), Nakamura et al.
patent: 5995180 (1999-11-01), Moriwaki et al.

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