Device and method for protecting a CRT screen

Details Device and method for protecting a CRT screen Device and method for protecting a CRT screen

1996-06-10

1998-02-17

Fleming, Fritz

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 54, 315380, H02H 900

Patent

active

057197350

ABSTRACT:
A device and method for protecting a CRT screen. The device includes first and second amplifying circuits for amplifying a video signal input thereto and outputting an amplified signal; a buffer circuit for buffering the amplified signal and generating an output signal for a screen; a Vcc voltage sensing circuit for detecting a drop in a Vcc voltage during a power cut-off stage; and a transistor being turned on based on the detection and being connected at the input stage of the buffer circuit for eliminating AC and DC components of the amplified signal outputted from the second amplifying circuit so as to eliminate formation of a spot on the screen during the power cut-off stage.

REFERENCES:
patent: 3629645 (1971-12-01), Taylor
"LM1203A 100 MHz RGB Video Amplifier System"; Mar. 1992, National Semiconductor; p. 81.

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