Image projection system with multiple arc lamps and flyseye lens array light homogenizer directing polychromatic light on a liquid crystal display
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United States of America Patent
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Aug 2, 2005
Issued Date -
N/A
app pub date -
Jun 8, 2001
filing date -
Oct 21, 1999
priority date (Note) -
Expired
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Abstract
A projector (12N) of this invention employs a 380 mm diagonal, amorphous silicon LCD (80) for receiving light rays from a light source (70), which achieves a small source size by employing four lamps (160) with small arc gaps (166) and a 'pinwheel' mirror (164) that overlaps light rays from each of the arc lamps into a single collimated light bundle. The small source size produces a small cone angle (130) of light through the LCD. A lens (78) directs the narrow cone of light though the LCD at an optimal angle for achieving a 1,500:1 contrast ratio. Only a 4× magnification ratio is required to achieve a 170 cm (67 inch) diagonal projected image, which ratio enables projecting SXGA or greater resolution images with a five element projection lens (86). The LCD achieves an operational life of at least 50,000 hours before projected images display color degradation.
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