Vehicle indicator circuit having controlled backlighting
First Claim
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1. A backlit indicator system comprising:
- a display having a plurality of graphical elements;
a plurality of lighting circuits, each of the lighting circuits corresponding to one of the graphical elements, each of the lighting circuits comprising;
a backlight light emitting diode (LED) configured to backlight the corresponding graphical element during a low light condition;
an indicator LED configured to selectively illuminate the corresponding graphical element for indicating an active vehicle function; and
a switch for alternately backlighting and illuminating the corresponding graphical element, said switch electrically connected to the backlight LED and to the indicator LED for selectively turning OFF the connected backlight LED, said switch responsive to a drive signal supplied by the indicator LED to turn OFF the backlight LED when the corresponding graphical element is illuminated by the indicator LED.
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Abstract
Indicator circuit having a backlight and an indicator light associated with a graphical element. The graphical element is adapted to be illuminated by the indicator light for indicating an active vehicle function as well as backlit by the backlight. A switch coupled to the backlight selectively turns OFF the backlight in response to a drive signal supplied by the indicator light. In this manner, the backlight is OFF when the graphical element is illuminated by the indicator light.
12 Citations
10 Claims
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1. A backlit indicator system comprising:
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a display having a plurality of graphical elements; a plurality of lighting circuits, each of the lighting circuits corresponding to one of the graphical elements, each of the lighting circuits comprising; a backlight light emitting diode (LED) configured to backlight the corresponding graphical element during a low light condition; an indicator LED configured to selectively illuminate the corresponding graphical element for indicating an active vehicle function; and a switch for alternately backlighting and illuminating the corresponding graphical element, said switch electrically connected to the backlight LED and to the indicator LED for selectively turning OFF the connected backlight LED, said switch responsive to a drive signal supplied by the indicator LED to turn OFF the backlight LED when the corresponding graphical element is illuminated by the indicator LED. - View Dependent Claims (2, 3, 4, 5)
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6. A method of alternately backlighting and illuminating a graphical element comprising:
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electrically connecting a plurality of lighting circuits to a display having a plurality of graphical elements, each of the lighting circuits corresponding to one of the graphical elements, each of the lighting circuits including a backlight light emitting diode (LED) configured to backlight a corresponding graphical element during a low light condition and an indicator LED configured to selectively illuminate the corresponding graphical element for indicating an active vehicle function; electrically connecting a switch to the backlight LED and the indicator LED for alternately backlighting and illuminating the corresponding graphical element, wherein the switch comprises an NPN transistor having a base, collector, and emitter; and responsive to an active low indicator signal from a vehicle control module turning ON the indicator LED, driving the base of the NPN transistor with the active low indicator signal to bias OFF the backlight LED when the indicator LED is ON. - View Dependent Claims (7, 8, 9, 10)
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Specification