Instrument panel illumination dimming control

Details Instrument panel illumination dimming control Instrument panel illumination dimming control

1976-04-14

1977-06-14

La Roche, Eugene R.

Electric lamp and discharge devices: systems

With signal, indicator, or alarm

Discharge device and/or rectifier in the signal circuit

307 10LS, 315 77, 315208, 315291, 315297, H05B 3702, H05B 4300

Patent

active

040299910

ABSTRACT:
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 illumination 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.

REFERENCES:
patent: 3295014 (1966-12-01), Fisher et al.
patent: 3366834 (1968-01-01), Potter
patent: 3938000 (1976-02-01), Higashide

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