Display device including a black level setting circuit

Details Display device including a black level setting circuit Display device including a black level setting circuit

1993-12-27

1995-04-25

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315382, 315386, 315388, 348379, G09G 104, H01J 2958

Patent

active

054102235

ABSTRACT:
Known display devices include a video signal processing circuit with a black level setting circuit. This black level setting circuit measures the black level of the video signal, for example, during the field retrace interval by making use of an extra output of the video output stage. However, the measured black level has a line-frequency interference component which is caused by a parasitic capacitance in the display tube. The line-frequency interference component is fully compensated for by coupling one side of a secondary winding of a transformer, required for the focusing voltage to be generated, to a first capacitor, the other terminal of which is connected to the measuring input of the black level setting circuit, and by coupling at least a second and a third capacitor across the secondary winding of the transformer.

REFERENCES:
patent: 3955120 (1976-05-01), Jurgensen
patent: 5278476 (1994-01-01), Ten Pierick et al.

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