Circuit for producing a dynamic focusing voltage in a television

Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits

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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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