Method and circuit for spot-killer control in cathode-ray tube

Details Method and circuit for spot-killer control in cathode-ray tube Method and circuit for spot-killer control in cathode-ray tube

2006-04-18

2006-04-18

Miller, John (Department: 2614)

Television

Cathode-ray tube burn-in prevention

C348S377000, C348S380000, C315S380000, C315S381000

Reexamination Certificate

active

07030908

ABSTRACT:
Disclosed are a method and an apparatus for preventing appearance of a zigzag flush of light in a cathode-ray tube at the time of turning it off. A train of power-off control pulses are produced in synchronization with the vertical sweeping signal; a spot-killer control signal starts in synchronization with a selected power-off pulse to make the whole screen of the cathode-ray tube bright; and the power supply turns off in synchronization with another selected power-off control pulse, so that the power-off is caused at the termination of the vertical sweeping. Thus, the remaining static electricity is discharged at the lowermost of the screen of the cathode-ray tube. To assure that the residual static electricity is discharged completely, the length of time “t1” (continuing for a selected integer as long as the pulse-to-pulse duration) is determined to meet the size of the cathode-ray tube.

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