Method of LED life extension and end-of-life prediction

Details Method of LED life extension and end-of-life prediction Method of LED life extension and end-of-life prediction

2006-11-21

2006-11-21

Shankar, Vijay (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S076000, C345S077000

Reexamination Certificate

active

07138970

ABSTRACT:
A method or technique of operating the LED illumination system within a line scan camera comprises the operation of the LED illumination sources at a relatively high gain control level, less than the one hundred percent maximum or acceptable gain level, and a correspondingly reduced duty cycle level, which is less than one hundred percent (100%), so as to effectively reduce the aging of the LEDs and thereby achieve extended service lives for the LEDs. As the LEDs age with usage, whereby their luminosity levels degrade, the duty cycle percentage level is progressively increased until a maximum output or one hundred percent duty cycle percentage level is reached at which time the gain control percentage is progressively increased up until the maximum acceptable gain percentage level. An end-of-life prediction technique or routine is also capable of being derived from the progressively increased gain control percentages so as to enable the replacement of the LED illumination sources at appropriate times.

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