Color phase control for projection display using spatial light modulator

A color-wheel motor control unit for a display system that uses a motor-driven color wheel, to display frames of color images from a video signal having a horizontal sync signal and a vertical sync signal, comprising:

• an oscillator for receiving the horizontal sync signal and for generating a first pulsed signal having a frequency of said horizontal sync signal times a frequency multiplier;
• a divide-by-n counter for receiving said first pulsed signal from said oscillator, and for dividing said first pulsed signal by a value equal to the number of lines in each frame, such that it generates a frame-pulsed signal;
• a second divide-by-n counter for receiving said frame-pulsed signal and for dividing said frame-pulsed signal by a predetermined frequency divider, such that it generates a square wave signal having a period equal to that of said vertical sync signal;
• and
• a spatial light modulator display, wherein said display uses said frame-pulsed signal to synchronize said color wheel with video data for said spatial light modulator.