Maintaining illumination intensity of a light emitting diode...

Details Maintaining illumination intensity of a light emitting diode... Maintaining illumination intensity of a light emitting diode...

2005-03-29

2005-03-29

Tweel, John (Department: 2636)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S815450, C345S102000, C315S291000, C315S20000A

Reexamination Certificate

active

06873262

ABSTRACT:
The illumination intensity of light emitting diode in an appliance display is maintained over time by automatically increasing an amount of electric current supplied to the light emitting diode, preferably incrementally, over the life of the light emitting diode. The automatic increase in current compensates for the gradual decay of the light emitting diodes over time, thereby allowing the light emitting diodes to maintain a constant illumination for the lifetime of the appliance.

REFERENCES:
patent: 4090189 (1978-05-01), Fisler
patent: 5457450 (1995-10-01), Deese et al.
patent: 5663719 (1997-09-01), Deese et al.
patent: 5783909 (1998-07-01), Hochstein
patent: 6153985 (2000-11-01), Grossman
patent: 6236331 (2001-05-01), Dussureault
patent: 6529182 (2003-03-01), Burton
patent: 6717526 (2004-04-01), Martineau et al.
patent: 6750842 (2004-06-01), Yu

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