Contrast polymer dispersed liquid crystal projection display system
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United States of America Patent
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Jun 5, 2001
Grant Date -
N/A
app pub date -
Dec 17, 1996
filing date -
Dec 17, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A polymer dispersed liquid crystal projection display is provided that has enhanced contrast. In the projection system using a polymer dispersed liquid crystal display (PDLC), polarized light is used as the light source onto the PDLC. The reflected light maintains its polarization, while the scattered light from the off pixels of the PDLC randomize the polarization. The polarized image is then passed through a polarizing filter which eliminates half of the scattered light, whereas practically all of the polarized image is passed onto the display source. In this way, the contrast between the on and off pixels is effectively doubled.
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