Vacuum fluorescent display having uniform character brightness

Details Vacuum fluorescent display having uniform character brightness Vacuum fluorescent display having uniform character brightness

1978-03-06

1979-02-27

Demeo, Palmer C.

Electric lamp and discharge devices

With luminescent solid or liquid material

Vacuum-type tube

313112, 313349, H01J 516, H01J 6302, H01J 6306

Patent

active

041421264

ABSTRACT:
An optical attenuator varying in optical transmission in a systematic fashion, compensates for non-uniform illumination of vacuum fluorescent characters due to filament voltage drop.

REFERENCES:
patent: 3688147 (1972-08-01), Raago
patent: 4045704 (1977-08-01), Kishino et al.

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