LED Backlight Driving System for Large-Scale LCD Panels

This paper presents an LED backlight driving system for large-scale liquid crystal display panels. High efficiency, high power factor, circuit simplicity, and low cost can be achieved by using a single-stage charge-pump asymmetrical half-bridge converter. To regulate the LED current and brightness f...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2007-10, Vol.54 (5), p.2751-2760
Main Authors: Chiu, Huang-Jen, Cheng, Shih-Jen
Format: Article
Language:English
Subjects:
Arrays
Backlights
Brightness
Bypass diode
Charge pumps
Circuits
Costs
Current sharing
dimming control
Driving
Laboratories
Large-scale systems
Light emitting diodes
light-emitting diode (LED) backlight
Liquid crystal displays
Luminance
Panels
power factor
Prototypes
Reactive power
single-stage charge-pump asymmetrical half-bridge (AHB)
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Summary:This paper presents an LED backlight driving system for large-scale liquid crystal display panels. High efficiency, high power factor, circuit simplicity, and low cost can be achieved by using a single-stage charge-pump asymmetrical half-bridge converter. To regulate the LED current and brightness for the LED backlight system, some current sharing methods are presented and compared. The requirements for the current sharing and luminance balance among paralleled LED arrays can be satisfied while current ripple is eliminated significantly. Because of the addition of bypass diodes, an alternative current path can be offered when a single LED fails. The LED array will not be extinguished. Reliability of the LED backlight system can thus be improved effectively. A laboratory prototype has been built and tested. The simulation and experimental results are shown to verify the feasibility of the proposed method.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2007.899938