AMBIENT LIGHT ILLUMINATED LIQUID CRYSTAL DISPLAY SYSTEM
Assignee
ALLIED-SIGNAL INC.
Filed
Jun 12, 1989
Granted
Mar 5, 1991
Location
MATAWAN NJ US
Abstract
A liquid crystal display system utilizes an optical arrangement which is aligned so that ambient light from the direction of an obersver's view is channeled behind the liquid crystal display to provide back illumination therefor. An illuminator is arranged to provide supplementary illumination for the liquid crystal display as may be required. A photodetector determines when ambient light is inadequate for required display brightness and operates through appropriate control circuitry to turn the illuminator on or off as the case may be and to control the contrast of the liquid crystal display.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Sep 28, 1989
Rescinded
Sep 20, 1990
Duration
11 months
Inventor
- 1RICHARD L. COHEN
Record Details
- Patent number
- US 4997263
- Application
- 00736475
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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