High frequency ballast for high intensity discharge lamps

摘要

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.