Patent ID: 7088321

Claim:
In a color sequential projection system, an apparatus comprising: a first set of light emitting devices (LEDs) to generate light having a first wavelength during a first emission time period; a second set of LEDs to generate light having a second wavelength during a second emission time period, the second wavelength being different from the first wavelength; a power supply providing a shared current source to the first and second set of LEDs; a first switch arranged in series with the first set of LEDs; a second switch arranged in series with the second set of LEDs; a display controller coupled to the power supply and the first and the second switches, the display controller to generate a first and second control signal respectively in accordance with a first and second color frame data, the first control signal to operate on at least the power supply or the first switch to enable the first set of LEDs during the first emission time period, and the second control signal to operate on at least the power supply or the second switch to enable the second set of LEDs during the second emission time period, wherein the light having the first wavelength and the light having the second wavelength is balanced, at least in part, by adjusting durations of the first emission time period and the second emission time period; and first and second light transmission guides to route light from the first and second sets of LEDs to first and second display devices.