ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The paper proposes a novel time based brightness compensation circuit for LED backlight modules. The brightness of LED decays while running under constant current drivencondition. We have designed a suitable controller to compensate the driving currents to maintain thebrightness. The compensation data were calculated from the relative luminous efficiency – timecurve provided by the LED manufacturer and were stored in the microprocessor. -The embeddedsystem used the running time of the LED in the back light module as an independent variable fortuning the driving current. The experiment results showed that the brightness of different operatingtimes’ LED arrays can be held almost the same as the new ones
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.364-366.377.pdf
