Dynamic focus circuit and display device

Details Dynamic focus circuit and display device Dynamic focus circuit and display device

1994-04-26

1997-03-25

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

348806, H01J 2958

Patent

active

056147929

ABSTRACT:
A dynamic focus circuit used in a display device having a cathode ray tube and adapted for controlling convergence of an electron beam of the cathode ray tube. In the dynamic focus circuit, a horizontal deflection circuit generates a saw-tooth-wave current and a flyback transformer generates a high voltage for accelerating an electron beam. An orthogonal transformer receives a signal corresponding to the saw-tooth-wave current through a primary winding via the flyback transformer while receiving a control signal of a control circuit through a control winding and generates a dynamic focus voltage through a secondary winding. A capacitor supplies the dynamic focus voltage to a cathode ray tube. Thus, it is possible to produce a device of compact structure and to generate a satisfactory dynamic focus voltage.

REFERENCES:
patent: 5162705 (1992-11-01), Golik

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