Liquid crystal display device with automatic constrast control

Details Liquid crystal display device with automatic constrast control Liquid crystal display device with automatic constrast control

1991-05-03

1992-10-06

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 86, 340713, 340741, 340742, G02F 113

Patent

active

051537567

ABSTRACT:
A liquid crystal display apparatus detects and regulates its display contrast. A liquid crystal display unit is provided therein with a pair of liquid crystal cells for use in detection of the display contrast. Incident light is detected through the cells, and the detected results are fed back to control a drive voltage applied to the liquid crystal display unit so as to automatically regulate the display contrast at optimum level.

REFERENCES:
patent: 4114366 (1978-09-01), Renner et al.
patent: 4242679 (1980-12-01), Morozumi et al.
patent: 4385294 (1983-05-01), Miles
patent: 4514727 (1985-04-01), Van Antwerp
patent: 4940931 (1990-07-01), Katayama et al.
patent: 5027266 (1991-06-01), Ishii et al.

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