Frequency switching circuit for multiple scan rate video display

Details Frequency switching circuit for multiple scan rate video display Frequency switching circuit for multiple scan rate video display

1984-02-21

1987-02-24

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

315408, 358137, H01J 2970, H01J 2976

Patent

active

046459898

ABSTRACT:
A video display apparatus operates at two or more horizontal scan rates. In order to prevent excessive collector voltage from being applied to the horizontal output transistor, a transition circuit turns off the horizontal output transistor when switching between horizontal scan frequencies occurs. The horizontal output transistor is maintained nonconductive until the correct oscillator frequency and supply voltage is coupled to the horizontal output circuit.

REFERENCES:
patent: 3784872 (1974-01-01), James
patent: 3786303 (1974-01-01), Hilburn
patent: 3816792 (1974-06-01), Spencer, Jr.
patent: 4400653 (1983-08-01), Olmstead
Schematic Diagram of Conrac Monitor Scan Board, dated 3/17/81.

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