Backlighting apparatus for uniformly illuminating a display pane

Details Backlighting apparatus for uniformly illuminating a display pane Backlighting apparatus for uniformly illuminating a display pane

1994-10-03

1997-11-04

Coles, Sr., Edward L.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

359 49, G02F 1133

Patent

active

056843542

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 at the opening of the aperture between the aperture and 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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