Circuit for producing a dynamic focusing voltage in a television

Details Circuit for producing a dynamic focusing voltage in a television Circuit for producing a dynamic focusing voltage in a television

1994-02-23

1995-11-28

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2958

Patent

active

054711215

ABSTRACT:
A circuit for generating a dynamic focusing voltage in a television receiver utilizing overscan periods includes a focusing voltage generator. The focusing voltage is compared to a reference voltage and a switching signal is provided when the focusing voltage goes below the reference voltage. A switch is responsive to the switching signal and provides a direct focusing voltage during the overscan periods. The direct focusing voltage has a level which maintains the arithmetic mean of the focusing voltage the same during the normal scan period and the overscan periods.

REFERENCES:
patent: 4683405 (1987-07-01), Truskalo et al.
patent: 4916365 (1990-04-01), Arai
patent: 5341071 (1994-08-01), George

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