Patent ID: 7954960
Filing Date: 2011-06-07
Classification: H04N

Abstract:
1. A video image display apparatus for displaying a video image in accordance with a video image signal, comprising: a light source for emitting an illumination light to a color wheel driven by a color wheel driving unit to rotate the color wheel for filtering and transmitting lights of different colors therefrom; a spatial light modulator (SLM) for receiving said lights of different color projected from said color wheel; a master clock signal generation unit for generating a master clock signal constituting a reference for transferring data to the SLM; a frame start signal generation unit for generating, from the master clock signal, a frame start signal indicating the start of a frame; a wheel position detection unit for detecting an angular position of the color wheel; a phase comparison unit for comparing a phase of the frame start signal with a wheel index signal generated from the wheel position detection unit indicating a position of the color wheel; and a motor control unit for receiving a phase comparison signal from said phase comparison unit for controlling a rotation speed of a motor for driving the color wheel to rotate at a controlled rotation speed.