Automatic convergence adjustment device of rear projection type video equipment

摘要

The present invention relates to a photoelectric conversion unit which is formed in the form of horizontal and vertical lines crossing each other inside a screen and converts light energy into electric energy when an electron beam of a cathode ray tube is incident, Convergence detecting unit for detecting a miss-convergence of the intersection according to a photoelectric conversion result of the photoelectric conversion unit; and a mis-convergence detecting unit for detecting a mis- And a microcomputer for controlling the amount of current flowing through the convergence yoke of the cathode ray tube when a misconvergence is detected by the detection unit, thereby adjusting the convergence of the intersection point. In the automatic convergence adjustment apparatus of the rear projection type video apparatus, Photoelectric converter to convert energy into electric energy A plurality of horizontal and vertical lines intersecting each other on the inner side of the screen. Then, it is detected whether a current flows through arbitrary horizontal and vertical lines at the same time and convergence adjustment is performed on the corresponding intersection (convergence adjustment point) There is an effect that fine adjustment can be performed while not affecting.