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Design of LCD Backlight Driver IC to improve the Brightness Uniformity  

Oh Myeong-Woo (R&D center, Silicon Works Co., Ltd.)
Yang Sung-hyun (SIC DNI Group, LG Electronics)
Cho Kyoung-Rok (Dept. of Computer Communication Engineering and Research Institute for Computer and Information Communication, Chungbuk National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.42, no.4, 2005 , pp. 53-60 More about this Journal
Abstract
This work Proposes and describes an LCD backlight driver IC using a voltage feedback circuit which improves the brightness uniformity. The proposed circuit controls the brightness of a backlight by amplifying of sampling voltage at a lamp. To keep the uniformity of brightness, the circuit has a reference lamp. The output voltage of the reference lamp is supplied commonly to each lamp that reduces a resistance deviation of the lamps. As a result, the proposed circuit shows brightness uniformity improvement of about $40\%$ compared to the conventional ones.
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