Symmetric Current-Balancing Circuit for LED Backlight With Dimming

被引：86
作者：
Choi, Sungjin [1 ]
Kim, Taehoon [2 ]
机构：
[1] Univ Ulsan, Sch Elect Engn, Ulsan 680749, South Korea
[2] Samsung Elect Co Ltd, Adv R&D Grp, Visual Display Div, Suwon 443742, South Korea
来源：
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS | 2012年 / 59卷 / 04期
关键词：
Backlight; current balancing; light-emitting-diode (LED) driver; liquid crystal display (LCD); DRIVING SYSTEM; DRIVER;
D O I：
10.1109/TIE.2011.2138112
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
One of the key challenges in driving multiple light-emitting-diode (LED) strings for a liquid-crystal-display (LCD) backlight system is to ensure uniform current control. Unequal current sharing between the strings is due to manufacturing spread and temperature variations. In this paper, a novel current-balancing circuit for LED backlights is proposed. A smart combination of an inherent symmetry of circuit and capacitive balancing mechanism enables an efficient and cost-effective current balancing. The operating principle of the proposed method is analyzed, and an appealing generalization is made. The feasibility of the proposed scheme is verified by developing a hardware prototype with a dimming feature to drive a 100-W edge-type backlight system, having six LED strings for a large-scale LCD panel.
引用
收藏
页码：1698 / 1707
页数：10
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