Video circuit for driving a cathode ray tube

Details Video circuit for driving a cathode ray tube Video circuit for driving a cathode ray tube

1991-12-19

1993-02-23

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315389, G09G 104, H01J 2970

Patent

active

051893479

ABSTRACT:
A video output circuit for driving a CRT of a grid-cathode differential drive type is disclosed, in which a collector potential of an output transistor in a horizontal blanking interval is detected by a diode arrangement; the potential thus detected is smoothed by a smoothing filtering arrangement output current of the output transistor is controlled by an output obtained by the smoothing filtering arrangement; and negative feedback control is effected so that the collector potential of the output transistor is made constant. In this way, a bias adjusting power supply, which was required heretofore, is made unnecessary.

REFERENCES:
patent: 4973890 (1990-11-01), Desjandins

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