Instrument panel illumination dimming control

Details Instrument panel illumination dimming control Instrument panel illumination dimming control

B - Operations, Transporting

60

Q

315/2

B60Q 3/04 (2006.01) H05B 33/08 (2006.01)

Patent

CA 1063667

INSTRUMENT PANEL ILLUMINATION DIMMING CONTROL Abstract of the Disclosure The brightness of an LED display on an automobile instrument panel is independent of the battery voltage but does depend on the position of the instrument panel illumin- ation dimmer potentiometer. The voltage applied to the LED is limited to a maximum by a zener diode control circuit and that voltage is reduced by a voltage detector circuit which senses the difference between the battery voltage and the dimmer potentiometer output voltage to reduce the LED voltage in proportion to that difference. The voltage detector circuit is disabled when vehicle parking lamps are turned off to insure maximum LED brightness in daytime driving.

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