Achieving color balance in image projection systems by injecting compensating light in a controlled amount
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United States of America Patent
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Mar 2, 2004
Grant Date -
Dec 12, 2002
app pub date -
Oct 15, 2001
filing date -
Jun 8, 2001
priority date (Note) -
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Abstract
The image projection system of the present invention improves either one or both of the brightness and color balance of a projected image. The system includes an auxiliary light source from which compensating light co-propagates with polychromatic light emitted by a primary light source along a primary light path. The compensating light has an emission energy content that minimizes an emission energy imbalance introduced by the primary light source and an intensity that is, in part, established by the application of electrical energy to the auxiliary light source. Adjusting the amount of electrical energy applied to the auxiliary light source regulates the color temperature of the projected image without perceptibly decreasing its brightness.
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