Horizontal deflection circuit for multiscan type display devices

Details Horizontal deflection circuit for multiscan type display devices Horizontal deflection circuit for multiscan type display devices

1996-02-20

1998-05-19

Pascal, Robert

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

315399, H01J 2970

Patent

active

057540152

ABSTRACT:
A multiscan compatible horizontal deflection driving circuit prevents the flow of an excessive current through a transistor in a horizontal deflecting circuit when the frequency of a horizontal synchronization signal is switched. In the horizontal deflection driving circuit according to the invention, when a frequency of an H sync pulse of an input composite video signal decreases, a driving power source voltage is reduced earlier than a reduction of a frequency of a horizontal driving pulse, thereby preventing an excessive collector current from flowing in the transistor in the horizontal deflecting circuit.

REFERENCES:
patent: 4673984 (1987-06-01), Kikuchi et al.
patent: 4679211 (1987-07-01), Kurz
patent: 5329211 (1994-07-01), Sasaki et al.

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