Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Patent
1990-08-20
1992-03-24
Laroche, Eugene R.
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
3151693, 315 97, 315105, G09G 310
Patent
active
050991787
ABSTRACT:
A method and system for providing a wide range of variable brightness levels for a vacuum fluorescent (VF) display by changing the duty cycle of the driving signal beyond the limits of normal driving techniques by varying the frequency as well as the on-time of the driving signal. The driving signal is multiplexed by a programmed driver microcomputer to drive a plurality of grids. Consequently, by varying the frequency, the multiplex period is also varied. The driver microcomputer communicates with a host microcomputer as well as drivers and grids of the VF display to control the VF display. In addition, the driver microcomputer samples a VF filament signal to synchronize the VF display multiplex frequency with the frequency of the VF filament signal to reduce flicker at low display brightness levels. The method and system achieve a continuously variable appearance of the VF display from full bright to barely discernable.
REFERENCES:
patent: 4158794 (1979-06-01), Sandler
patent: 4388558 (1983-06-01), Mizuno et al.
patent: 4495445 (1985-01-01), Turney
patent: 4719389 (1988-01-01), Miesterfeld
patent: 4791337 (1988-12-01), Murata
patent: 4859912 (1989-08-01), Lippmann et al.
Bozzer Erich
Burke Thomas G.
Raffa James M.
Dinh Tan
Ford Motor Company
Godwin Jr. Paul K.
LaRoche Eugene R.
May Roger L.
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