Method and apparatus for improving the color convergence of projection-based displays
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United States of America Patent
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Jan 16, 2001
Grant Date -
N/A
app pub date -
Jan 14, 1999
filing date -
Jan 14, 1999
priority date (Note) -
Expired
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Abstract
System and method for improving color convergence in projection display systems employs one or more mirror units disposed for reflecting light from the projection lens to a display screen, each mirror unit including one or more reflective layers adjustably positioned for changing the path length of selected one or more color components of the color image. Changing the path length of the selected one or more color components of the color image effectively changes the magnification of those selected color components according to: ##EQU1## where v is path length traversal of the light from the projection lens to the display screen, .delta.v is change in path length effected by the positioning of the reflective layers, m is the magnification factor, and .delta.m is the change in magnification factor of a color component required to correct color convergence of a displayed image. Once a desired change in path length is calculated to adjust magnification of the color component to improve color convergence, the relative spacing of the one or more reflective layers in each mirror unit may be determined.
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