Illumination system and display device including such a system
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United States of America Patent
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Feb 24, 1998
Grant Date -
N/A
app pub date -
Dec 17, 1996
filing date -
Jan 11, 1993
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An illumination system comprising a reflector, a cholesteric filter and a depolarizer. The cholesteric filter is arranged between a radiation source and, in a display device, a display panel, and is selected to transmit radiation having a selected state of polarization in a selected wavelength range, while reflecting otherwise polarized radiation in that wavelength range. The depolarizer is disposed between the reflector and the cholesteric filter. Radiation reflected by the cholesteric filter is re-reflected to the filter by the reflector and, having been depolarized in the depolarizer, is transmitted to the extent it has the selected state of polarization in the selected wavelength.
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