Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1994-01-31
1995-10-31
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
348634, H01J 2952
Patent
active
054632897
ABSTRACT:
A first grid muting circuit for a monitor display for smooth muting operation of a muting circuit portion to provide a stable picture to a viewer can be favorably applied to a monitor circuit by a microcomputer for supplying a muting signal to blocks per corresponding modes, a contrast muting circuit portion for muting the muting signal to a predetermined level, a video circuit for outputting the muted contrast signal as a video signal, a first grid drive portion for driving a first grid circuit, and the first grid circuit for outputting a first grid signal for controlling a cathode ray tube to a vertical blanking circuit in accordance with a control signal of the first grid drive portion. The first grid muting circuit further has a plurality of switches for selectively switching a positive power supply voltage in accordance with the muting signal of the microcomputer to output the switched positive power supply voltage, and resistors for variably adjusting a negative power supply voltage in accordance with a predetermined variable resistance value to output the adjusted negative power supply voltage, thereby minutely controlling the operation of a muting circuit portion to provide the stable picture.
REFERENCES:
patent: 5077502 (1991-12-01), Shaklee et al.
patent: 5250878 (1993-10-01), Rothe et al.
Blum Theodore M.
Samsung Electronics Co,. Ltd.
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