INSTRUMENT PANEL ILLUMINATION DIMMING CONTROL

INSTRUMENT PANEL ILLUMINATION DIMMING CONTROL 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...

Full description

Saved in:
Bibliographic Details
Main Author SCHULTZ, FREDERICK K
Format Patent
LanguageEnglish
French
Published 02.10.1979
Subjects
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
Online AccessGet full text

Cover

More Information
Summary:INSTRUMENT PANEL ILLUMINATION DIMMING CONTROL 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.
Bibliography:Application Number: CA19770274959