Display system

Details Display system Display system

1993-04-27

1994-11-22

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

348327, 348380, H01J 2952

Patent

active

053672313

ABSTRACT:
The life time of a CRT is extended by decreasing the temperature of the cathode by 7-30% from the normal operating temperature and by applying a constant voltage signal to a cathode of the CRT which is shifted from a first voltage level for displaying the lowest luminance of the image toward a second voltage level for displaying the highest luminance of the image. The shift is of the order of 5-25%, so that a constant anode current in the range of 2-14 uA flows in the CRT.

REFERENCES:
patent: 4224640 (1980-09-01), Hovens et al.
patent: 4308555 (1981-12-01), Hovens et al.
patent: 4514664 (1985-04-01), Kasagi et al.

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