MTF measurement for optical engine of CRT rear-projection HDTV

Two methods to measure the MTF (modulation transfer function) of an optical engine of CRT rear projection HDTV (high definition television) are introduced. A rotating image analyzer on the fluorescent surface with a 2D CCD and a relay lens is used to test in the full-field angle. We developed a software program to automatically locate and measure the position of the maximum value of the MTF at any spatial frequency.