Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title A New Current-Balancing Multi-Channel LED Driver for a Large Screen LCD Backlight Unit
Authors 李Sang-Hyun Lee ; Sang-Ho Cho ; 盧Chung-Wook Roh ; Sung-Soo Hong ; Sang-Kyoo Han
DOI 10.6113/TKPE/2010.15.2.111
Page pp.111-118
ISSN 1229-2214
Keywords LED; Transformer; Capacitor Charge Balance; Dimming
Abstract Recently, LCD TV using LED backlight has a great attention due to its low power consumption, slim construction, mercury free, wide color gamut and fast response. For the uniform brightness of the LCD panel, multi channel LEDs and DC/DC converter for each LED are required in conventional system. Therefore energy conversion efficiency is poor, the system size bulky and the cost of production high. To overcome these above mentioned drawbacks, a new current-balancing multi-channel LED driver is proposed in this paper. It can not only drive multi-channel LEDs with one DC/DC converter but also provide all LEDs with constant balanced current. To confirm the validity of the proposed driver, its operation and performance are verified on a prototype for 46'' LCD TV..