Electronic dimmer control for vacuum fluorescent display...

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

H - Electricity

05

B

315/29, 375/47

H05B 37/02 (2006.01) G09G 3/06 (2006.01) H05B 41/392 (2006.01)

Patent

CA 1295656

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. .

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