Electric lamp and discharge devices – With gas or vapor – Incandescent filament lamp
Patent
1997-10-27
1999-04-06
O'Shea, Sandra
Electric lamp and discharge devices
With gas or vapor
Incandescent filament lamp
313110, 313113, 313116, 313117, 313580, H01K 150, H01K 126, H01J 516, H01J 6140
Patent
active
058923250
ABSTRACT:
A light source for backlighting a display panel comprises a light-emitting device such as an incandescent light bulb or LED array disposed within a cavity having diffusely reflecting walls and an aperture. A diffuser and brightness enhancing film are situated proximate the opening of the aperture which illuminates the display to be backlit. Preferably, light emerging from the aperture is substantially uniform in intensity and color, and in one embodiment, a color filter is employed to whiten the light emerging from the aperture. One embodiment has an aperture in which the ratio of the area of the aperture to the sum of such area and the surface area of the cavity is at least 0.05. In this embodiment, the ratio of the depth of the cavity to an edge to edge dimension of the cavity is at least 0.1.
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3M Optical Systems Brightness Enhancement Film (BEF), 2 pgs., 1993.
Haynes Mack
O'shea Sandra
Pugh Robert J.
Teledyne Lighting and Display Products, Inc.
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