Apparatus and methods for back illuminating a display surface
US4206501A · kind A · utility
26Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 12, 1978 |
| Grant date | Jun 3, 1980 |
| Priority date | — |
| Expiry date | Jun 12, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133604
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An apparatus for back lighting a display surface of a liquid crystal display includes a light source and a diffusing backplate interposed between the light source and the display. The diffusing backplate is selectively darkened to attenuate light rays from the light source to provide substantially uniform back illumination of the display. The diffusing backplate further includes a plurality of heating resistors and a thermistor for maintaining the temperature of the display above a predetermined minimum temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.