Projection TV (TV) damage prevention circuit and CRT damage prevention method

摘要

The present invention is a projection tube damage prevention circuit of a projection TV (TV) to prevent damage to the CRT by detecting the points of the specific portion when the same pattern is output for a long time on a specific portion of the screen of the projection TV to lower the luminance value of the advantages And the CRT damage prevention method, but CRT protection circuit of the conventional projection TV can prevent CRT damage only when the whole screen is a still picture, but in reality, the whole screen is rarely a sperm image, and only a specific part of the screen has the same pattern. The output is continuously output, so the remainder is often a moving picture, so the CRT cannot be protected.;That is, since the projection TV is large, it is used for a variety of displays such as a variety of entertainment devices and computers. In this case, the specific part is often fixed to the desktop, and thus the CRT has been damaged.;The present invention is to solve the conventional problems such that when a specific portion of the screen is output in the same pattern over a long period of time to detect the points of the specific portion to lower the luminance value of the detected points to prevent damage to the CRT Applies to projection TV.