Keystone description correcting circuit using high voltage corre

Details Keystone description correcting circuit using high voltage corre Keystone description correcting circuit using high voltage corre

1995-11-08

1996-12-03

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315387, G09G 104, H01J 2970

Patent

active

055811647

ABSTRACT:
A flat type CRT includes a horizontal deflection circuit and/or a vertical deflection circuit, in which order to prevent undesired zooming without using a high voltage regulator, reduce an amount of overscanning, and stabilize the picture, the deflection circuit is separated from a high voltage generating circuit, and a capacitor is provided between the high voltage generating circuit and the deflection circuit. The capacitor is arranged to provide a low voltage .DELTA.HV proportional to an anode voltage HV. This low voltage is added to the output of a transistor so that the level of the deflection voltage is varied.

REFERENCES:
patent: 3890541 (1975-06-01), McCarthy et al.
patent: 3949270 (1976-04-01), Akatsu et al.
patent: 4063134 (1977-12-01), Iida
patent: 4665347 (1987-05-01), Walker et al.
patent: 4752722 (1988-06-01), Erratico et al.
patent: 4927219 (1990-05-01), Golik
patent: 5177413 (1993-01-01), Wilber

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