Large-area light source

Details Large-area light source Large-area light source

1979-06-13

1981-07-07

Lechert, Jr, Stephen J.

Illumination

Revolving

362 26, 362354, F21V 704

Patent

active

042778174

ABSTRACT:
To provide for uniform output throughout the area of the light source, particularly to provide a background illuminating surface for liquid crystal display, an especially adapted for automotive application, the light-emitting surface is formed as a wedge-shaped body of transparent material, such as Plexiglas, with light being coupled thereinto at the wider side surface, the bottom surface of the wedge-shaped body having, preferably, a reflective, light dispersing layer or coating applied thereto, for example in form of a white pigmented lacquer, white paper, a ceramic plate, or the like; an intermediate layer of light-transmissive material having an index of refraction less than the index of refraction of the body may be interposed between the surface of the body and the reflective coating of layer. The top surface of the body can be matte, for example formed by microgrooves extending transversely to the plane of the side surface through which light is coupled into the wedge-shaped body. The light can be coupled thereinto derived, for example, from an incandescent bulb.

REFERENCES:
patent: 4059916 (1977-11-01), Tachihara et al.

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