Illumination control unit for display system with spatial light modulator
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United States of America Patent
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-
Nov 14, 1995
Grant Date -
N/A
app pub date -
Mar 31, 1994
filing date -
Mar 31, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An illumination control unit (17) for a projection display system (10) that uses a digital mirror device (DMD) (15) to generate images. The illumination control unit (17) has a first set of lenses (23) for receiving light from a source and focussing the light to a color filter (24). A second set of lenses (25) receives the colored light and directs it to a prism (28). The prism (28) bends the light toward the reflective mirrors (30) of the DMD (15), and a collimating lens (28a) provides a beam that is approximately the size of the mirror array of the DMD (15). An optical shutter (26) is interposed between the second set of lenses (25) and the prism (28a), and permits the system (10) to achieve a 'black state' between image displays or to achieve modulated brightness levels of images being displayed.
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