Vacuum fluorescent display driver

Details Vacuum fluorescent display driver Vacuum fluorescent display driver

1997-12-11

1999-12-21

Hjerpe, Richard A.

Computer graphics processing and selective visual display system

Plural physical display element control system

Segmented display elements

345 33, 345 34, 345 42, 315307, G09G 306

Patent

active

060055383

ABSTRACT:
A vacuum fluorescent display driver and method for driving a vacuum display device includes a segment selecting circuit which selectively applies a potential of a particular polarity to a segment to illuminate that segment and a grid driver circuit which applies a potential of that polarity to the grid in order to illuminate the device. A filament supply supplies a current to the filament during a first portion of a duty cycle in order to heat the filament and applies a potential of polarity opposite to that applied to the filament during a second portion of the duty cycle in order to produce a potential between the filament, the grid, and any segment which is selected sufficient to illuminate the selected segments. The driver is especially adapted for use with a microcomputer particularly in a vehicle display mirror, such as a compass mirror.

REFERENCES:
patent: 4158794 (1979-06-01), Sandler
patent: 4209729 (1980-06-01), McElroy
patent: 4488089 (1984-12-01), Shota
patent: 5099178 (1992-03-01), Bozzer et al.
patent: 5442259 (1995-08-01), Lameris et al.
patent: 5703441 (1997-12-01), Steigerwald et al.
patent: 5808419 (1998-09-01), Sunaga et al.

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