Apparatus and methods for back illuminating a display surface

Details Apparatus and methods for back illuminating a display surface Apparatus and methods for back illuminating a display surface

1978-06-12

1980-06-03

Engle, Samuel W.

Illumination

Light source and modifier

Including selected wavelength modifier

350345, 350351, 362311, F21V 900, G02F 113, F21V 300, F21V 500

Patent

active

042065011

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.

REFERENCES:
patent: 3602590 (1971-08-01), Lukens
patent: 4118111 (1978-10-01), Laesser
patent: 4132464 (1979-01-01), Maeno

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