Circuit for generating control grid voltage for cathode ray tube

Details Circuit for generating control grid voltage for cathode ray tube Circuit for generating control grid voltage for cathode ray tube

1998-06-08

2000-10-24

Ham, Seungsook

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315411, G09G 104, H01J 2970

Patent

active

061372455

ABSTRACT:
A control grid voltage generating circuit comprises a high voltage source, a low voltage source and an amplifier biased by the high/low voltage sources. The high voltage source is coupled to the ground through a low-impedance path. The amplifier receives an input signal and generates a control grid voltage in response to the input signal. When the CRT is powered off, the amplifier can be rapidly discharged via the low-impedance path, thereby speedily turning off the amplifier. The control grid voltage is then driven to be the low reference voltage, thereby cutting off the electron beam and protecting the CRT.

REFERENCES:
patent: 3560653 (1971-02-01), Dias
patent: 3919598 (1975-11-01), Samizo
patent: 4218720 (1980-08-01), Kam et al.
patent: 5604404 (1997-02-01), Sahara

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