CATHODE RAY TUBE DISPLAY DEVICE WITH STRAY EMISSION PREVENTING FUNCTION

摘要

PURPOSE: To prevent the generation of stray emission without applying a sense of uneasiness or the like to a viewer when the off operation of a power source is performed, and to prevent the generation of the stray emission even when an input power source is interrupted due to interruption or the like. ;CONSTITUTION: A microcomputer 11 receives the command of a power source off from a remote controller or the like, and transmits a signal to a video chroma junction(VCJ) IC 2. The VCJIC 2 transmits an on-screen display(OSD) signal constituted of characters, patterns, or chrominance signals for making the surface of a CRT 5 uniformly bright to the CRT 5. Afterwards, the microcomputer 11 turns off a switch 18 of a main power source 17. Also, at the time of interruption, an interruption detecting circuit 21 detects the trailing of the output of a stand-by power source 20, and outputs an interruption detection signal to the microcomputer 11. Then, the microcomputer 11 transmits the signal to the VCJIC 2, and the VCJIC 2 transmits the OSD signal for making the display surface uniformly bright.;COPYRIGHT: (C)1994,JPO