CRT Drive circuit comprising white and black level clamping circ

Details CRT Drive circuit comprising white and black level clamping circ CRT Drive circuit comprising white and black level clamping circ

1980-09-29

1982-05-04

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 34, 358170, 358171, H04N 518, H04N 9535

Patent

active

043285147

ABSTRACT:
A CRT drive circuit for amplifying a video signal applied through a video signal transmission cable to a level sufficient to drive a CRT wherein a circuit for clamping the video signal to a white level during the entire period when the cable is disconnected is provided at an input stage, a blanking circuit for clamping the video signal to a black level during a flyback period is provided in an intermediate stage, and a D.C. restore circuit for clamping the black level of the video signal output to a level corresponding to a black level input to the CRT is provided at an output stage. When the cable is disconnected, the entire display area of the CRT screen displays white so that the CRT drive circuit can be readily checked for proper operation.

REFERENCES:
patent: 3729577 (1973-04-01), Buell

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