High frequency ballast for high intensity discharge lamps
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United States of America Patent
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-
Jun 12, 2001
Grant Date -
N/A
app pub date -
Dec 21, 1999
filing date -
Dec 31, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A high frequency arc lamp power supply (518) and display system (500). The power supply (518) drives an arc lamp (504) at a frequency high enough to several times higher than the display system's LSB frequency. By pulsing the lamp many times during each LSB period, the variations in light output during the pulses are all integrated in each bit period and do not degrade the quality of the image display. This eliminates the need for the controller (514) to synchronize the arc lamp power supply (518) with the spatial light modulator (502) when using pulse width modulation.
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