Illumination device for illuminating a display device
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United States of America Patent
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Jul 21, 1998
Grant Date -
N/A
app pub date -
Jun 23, 1992
filing date -
Nov 23, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to an illumination device for illuminating a display device. In a preferred embodiment, non-polarized light from a non-polarized light source is polarized by a holographic polarization beam splitting device and focused onto a liquid crystal display device by a holographic focusing device. The invention is operable with monochrome and color display devices, and allows for a high light yield independent of the useful surface area of each detector element of the display device.
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