Spot removing circuit for a CRT with grid control means

Details Spot removing circuit for a CRT with grid control means Spot removing circuit for a CRT with grid control means

1995-12-29

1997-10-28

Lee, Benny

Electric lamp and discharge devices: systems

Cathode ray tube circuits

315381, 315384, 315386, 348377, H01J 2952, H04N 324

Patent

active

056820836

ABSTRACT:
A spot removing circuit for a display device is disclosed. The spot removing circuit comprises a rectifying and smoothing portion for rectifying and smoothing the voltage outputted from a flyback transformer, a capacitor for charging a voltage supplied from a power supply and discharging the charged voltage when the power supply switch is turned off, and a grid control portion for supplying a grid terminal with the voltage outputted from the rectifying and smoothing portion when a power supply switch is turned on and for supplying the grid terminal with the voltage discharged from the capacitor plus the output voltage from the rectifying and smoothing portion when the power supply switch is turned off so that a spot can be prevented from appearing on a display screen when the power supply switch of the display device is turned off.

REFERENCES:
patent: 4056758 (1977-11-01), Schaas
patent: 4217525 (1980-08-01), Nakamura et al.
patent: 5084657 (1992-01-01), Ueda

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