Liquid crystal display illumination system
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United States of America Patent
Stats
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Apr 10, 1990
Grant Date -
N/A
app pub date -
Dec 8, 1987
filing date -
Dec 17, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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