PROJECTION OPTICAL UNIT, PROJECTION TYPE COLOR VIDEO DISPLAY DEVICE AND REAR PROJECTION TYPE COLOR VIDEO DISPLAY DEVICE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a projection type video display device improved in image quality and reliability.;SOLUTION: A yellow component is cut from red and green so as to enhance color purity, and also a reflection type attenuation filter for reflecting light is inserted in a green optical path so as to improve light energy balance of three colors. An optical phase difference compensation plate is provided in the green optical path, so as to improve contrast performance. In order to achieve prolongation of the service life of a video display element, two optical components subjected to ultraviolet reflection coating are arranged in a blue optical path, and an ultraviolet absorption filter is provided on the incident side of a blue liquid crystal panel.;COPYRIGHT: (C)2009,JPO&INPIT