Illumination – Display backlight – Lcd backlight
Patent
1988-05-06
1989-05-30
Lazarus, Ira S.
Illumination
Display backlight
Lcd backlight
362223, 362 31, 362311, 362346, 401522, 40546, G09F 1304
Patent
active
048356611
ABSTRACT:
An enhanced lighting unit is disclosed that is particularly useful for lighting displayable materials such as photographs, paintings, graphics and the like. The unit is compact and includes a housing having display positioning elements that define a planar display area for viewing of displayable materials thereat. The display area can be adjacent to a display surface, such as is provided, for example, by a picture frame, for receipt of the material to be displayed thereat. The unit also includes a light diffusing surface in the housing opposite to, and substantially coextensive with, the planar display area with the light diffusing surface being disposed so that the distance between the planar display area and the light diffusing surface continually decreases along their entire lengths. A low wattage light source is attached, within the housing, adjacent to the end of the light diffusing surface wherein the distance between the light diffusing surface and the planar display area is greatest, all other components of the lighting, for example a ballast, being located outside of the housing to thereby reduce heat within the unit. In this manner, light from the light source is evenly diffused throughout the housing by the light diffusing surface thereby enhancing illumination of the material displayed at the planar display area while not necessitating increased housing depth to illuminate larger display surfaces.
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"Three Methods for Lighting Panels; Why Backlighting is Best", Electronic Design, Aug. 2, 1961, p. 47, (401546).
Fogelberg Clement V.
Fogelberg Weymouth
Cox D. M.
Harris Robert E.
Lazarus Ira S.
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