Liquid crystal display illumination system

Details Liquid crystal display illumination system Liquid crystal display illumination system

1987-12-08

1990-04-10

James, Andrew J.

Illumination

Supported by vehicle structure

Condition responsive

362 32, G02F 1133, F21V 704

Patent

active

049154796

ABSTRACT:
An illumination system is provided for a liquid crystal display panel. The panel 1 is placed to transmit light 2 from a light source 3 to a viewing location, the light source being an extended area source of omnidirectional light of high efficiency, such as a fluorescent tube. A light guide 6 is placed between the source and the panel, the light guide comprising a transparent input face 7 adjacent the source, a transparent output face 10 adjacent the panel, and reflective side walls 11 transverse to the input and output faces. The light guide is tapered, the input face being smaller in area than the output face. The divergence of light from the source is thereby reduced as it passes through the panel. The LCD panel then functions with an improved contrast range.

REFERENCES:
patent: 3825741 (1974-07-01), Mortan et al.
patent: 3923381 (1975-12-01), Winston
patent: 4114592 (1978-09-01), Winston
patent: 4299447 (1981-11-01), Soltan et al.
patent: 4330813 (1982-05-01), Deutsch
patent: 4735495 (1988-04-01), Henkes
Hecht et al, Optics, Addison-Wesley, Massachusetts, 1974, p. 81.

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