Patent ID: 6806908
Filing Date: 2004-10-19
Classification: H04N

Abstract:
A cathode current limiting circuit for use with a projection color television display having a video processor for processing received television signals and for producing low level red (R), green (G) and blue (B) signals, a cathode ray tube (CRT) drive for receiving the low level RGB signals and for producing high level RGB signals, and respective cathode ray tubes for receiving the high level RGB signals, said cathode current limiting circuit including a first sensing device comprising:inputs for receiving said low level RGB signals; a monitoring circuit for monitoring differences between voltages of the low level RGB signals; and an output for producing an output signal when the voltage of one of the low level RGB signals exceeds the voltage of all of the other low level RGB signals, the output signal being applied as a feedback signal to the video processor for adjusting the low level RGB signals to limit a cathode beam current of the CRT to which the high level RGB signal, corresponding to the low level RGB signal having the highest voltage, is applied.