Circuit for preventing doming of cathode ray tube

Details Circuit for preventing doming of cathode ray tube Circuit for preventing doming of cathode ray tube

1992-07-23

1993-06-01

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358168, H01J 2952

Patent

active

052163350

ABSTRACT:
A circuit for preventing the doming of the cathode ray tube in color TVs and instruments using high-resolution CRT's is disclosed. In the circuit a collector voltage in a voltage control circuit is gradually decreased using a thermistor with a negative temperature coefficient, and the clipping level for a video signal and a brightness level are gradually increased, thereby increasing the beam current of the CRT slowly, wherein the thermal expansion of the CRT shadow mask gradually occurs, preventing the formation of color stains and speckles on the screen and preventing the degradation of the picture.

REFERENCES:
patent: 3848945 (1974-11-01), Holzrichter

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