A Novel Time Based Current Compensator for LED Back Light Modules

Abstract:

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The paper proposes a novel time based brightness compensation circuit for LED back light modules. The brightness of LED decays while running under constant current driven condition. We have designed a suitable controller to compensate the driving currents to maintain the brightness. The compensation data were calculated from the relative luminous efficiency – time curve provided by the LED manufacturer and were stored in the microprocessor. -The embedded system used the running time of the LED in the back light module as an independent variable for tuning the driving current. The experiment results showed that the brightness of different operating times’ LED arrays can be held almost the same as the new ones.

Info:

Periodical:

Key Engineering Materials (Volumes 364-366)

Edited by:

Guo Fan JIN, Wing Bun LEE, Chi Fai CHEUNG and Suet TO

Pages:

377-382

DOI:

10.4028/www.scientific.net/KEM.364-366.377

Citation:

Y. H. Fan et al., "A Novel Time Based Current Compensator for LED Back Light Modules", Key Engineering Materials, Vols. 364-366, pp. 377-382, 2008

Online since:

December 2007

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Price:

$35.00

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