Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1985-12-11
1987-02-24
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315383, H01J 2952
Patent
active
046459880
ABSTRACT:
A temperature compensated G2 grid drive circuit for use with a video display having a high voltage section supplying a high voltage signal to a cathode, filament and G2 grid of a CRT, wherein the high voltage section has a negative temperature coefficient, includes an input terminal for receiving the high voltage signal and a temperature compensating circuit coupled between the input terminal and the G2 grid of the CRT. The temperature compensating circuit is characterized as having a slightly positive temperature coefficient for maintaining the brightness of the video display substantially constant by driving the G2 grid for compensating for variations with temperature in the high voltage signal supplied to the cathode, filament and G2 grid.
REFERENCES:
patent: 3562578 (1971-02-01), Takahashi
patent: 3796912 (1974-03-01), Funston
patent: 4283663 (1981-08-01), Miyoshi et al.
patent: 4300074 (1981-11-01), Diddens et al.
Gawell George R.
Steinmetz Richard J.
Sutton Leroy A.
Blum Theodore M.
Cain D.
Zenith Electronics Corporation
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