Electronic dimmer control for vacuum fluorescent display devices

Details Electronic dimmer control for vacuum fluorescent display devices Electronic dimmer control for vacuum fluorescent display devices

1988-10-05

1990-11-06

Pascal, Robert J.

Electric lamp and discharge devices: systems

Special application

Vehicle

3151691, 315307, H05B 3702

Patent

active

049689177

ABSTRACT:
Apparatus and method for setting the pulse width modulation duty cycle that drives a vacuum fluorescent display device in response to changes in the setting of a dimmer control rheostat by establishing a constant window of acceptable voltage references that are changed when the setting of the dimmer control rheostat is changed, and by sequentially stepping through a set of discrete voltages whenever the setting of the dimmer control rheostat is changed until one of the discrete voltages is found to lie within the window of reference voltages. A dimmer signal is sent to a display driver circuit that corresponds to the selected discrete voltage lying within the reference window and determines the duty cycle and consequent brightness level for the display device.

REFERENCES:
patent: 4029991 (1977-06-01), Schultz

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