Scanning CRT display system with linearity compensation

Details Scanning CRT display system with linearity compensation Scanning CRT display system with linearity compensation

1985-04-12

1987-03-24

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315370, 315401, 315400, H01J 2956

Patent

active

046527982

ABSTRACT:
A scanning CRT display system is disclosed in which transitions of a horizontal sync signal are directly utilized to provide control signals for driving a FET (field effect transistor) power drive device which controls horizontal deflection yoke current. Protection circuitry is provided such that the FET power drive device is turned off if excessive FET through current is sensed, and protection circuitry also prevents turning on the FET drive device if an excessively high flyback voltage is present at the drain terminal of the FET device. Linearization of the horizontal deflection yoke current is provided by effectively sensing the temperature variable on resistance of the FET output drive device and providing a compensation control signal in accordance therewith, wherein this compensation control signal controls the magnetization provided by a control winding on a saturable magnetic core on which a linearity compensation coil is also wound. The linearity compensation coil and the deflection yoke are connected in series and the compensation control signal effectively reduces the series inductance of these elements so as to provide linearity compensation for horizontal deflection yoke current.

REFERENCES:
patent: 3668464 (1972-06-01), Tokita et al.
patent: 3688154 (1972-08-01), Christopher
patent: 4006385 (1977-02-01), Onodera
patent: 4024432 (1977-05-01), Bockhorst
patent: 4283663 (1981-08-01), Miyoshi et al.
patent: 4297621 (1981-10-01), Spilsbury

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