DEVICE OF AUTOMATICALLY COMPENSATING FOR PICTURE OUTPUTTED FROM BEAM PROJECTOR, CAPABLE OF AUTOMATICALLY COMPENSATING FOR VIDEO DISTORTION FOR IMAGE PROJECTED ON SCREEN BY DETECTING INSTALLED STATE OF THE BEAM PROJECTOR

摘要

PURPOSE: A device of automatically compensating for a picture outputted from a beam projector is provided to detect the installed state of a rear type or a front type beam projector, thereby automatically compensating for a video distortion for an image projected on a screen. CONSTITUTION: Supersonic sensors(11-14) measure upper, lower, left, right distances between a beam projector and a screen. A vertical distance comparator(31) compares a measured value for the upper distance with a measured value for the lower distance, and outputs a vertical state signal in accordance with the compared result. A right/left distance comparator(32) compares a measured value for the left distance with a measured value for the right distance, and outputs a right/left state signal in accordance with the compared result. A system controller(40) controls a reflection angle of a reflecting mirror configured within an optical engine based on the vertical state signal and the right/left state signal, and performs control for compensating for a displayed screen.