Multiple frequency vertical scan system

Details Multiple frequency vertical scan system Multiple frequency vertical scan system

1990-12-03

1991-10-22

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2970, H01J 2976

Patent

active

050598732

ABSTRACT:
A display monitor includes a conventional cathode ray tube display and display drive. A conventional horizontal deflection system and high voltage system are operable to provide horizontal scan of the cathode ray tube and a high voltage potential therefor. A vertical deflection system suitable for multiple frequency and normal or expanded modes of operation includes a vertical oscillator and vertical amplifier driving a vertical deflection yoke. A sample of the vertical deflection signal is detected by an amplitude detector and compared to a reference amplitude to produce an error signal operative upon the vertical scan system. Individual reference voltages corresponding to normal and expanded modes of operation are selectively coupleable to the reference voltage portion of the system by a selector switch.

REFERENCES:
patent: 4945292 (1990-07-01), Ackerson et al.
patent: 4961032 (1990-10-01), Rodriguez-Cavazos

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