Fast transition current-type burst-mode dimming control for the LED back-light driving system of LCD TV

Chen, Choon Chowe; Wu, Chao-Chun; Wu, Tsai‐Fu

doi:10.1109/pesc.2006.1712220

Cited by 22 publications

(14 citation statements)

References 8 publications

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“…In [24], a multioutput flyback converter is designed to provide three output voltages for RGB LED strings, respectively. In [25], a multioutput converter with current ripple-free topology based on mag-amp postregulator is proposed. This interesting idea utilizes the parallel master and slave converter concept for multistring application, and the use of passive ripple cancellation to provide smooth current control for LED strings.…”

Section: Dedicated Dc/dc Converter Methodsmentioning

confidence: 99%

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A Dimmable Light-Emitting Diode (LED) Driver With Mag-Amp Postregulators for Multistring Applications

Chen

Hui

2011

IEEE Trans. Power Electron.

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Current imbalance should be avoided when multiple LED strings are connected in parallel. In this paper, a dimmable LED driver with magnetic-amplifier postregulators for multistring applications is presented. Powered by a common master source, parallel LED strings are individually regulated by their corresponding adaptive slave sources for current balancing in this proposal. Without linear current regulators, the proposed driver offers relatively high efficiency. Its structure is simpler than multiconverter structures for red, blue, and green LED applications, and is particularly suitable for LEDs with wide parameter variations. The performance of the proposed driver is experimentally verified by a 16.5-W prototype with a load of three 5.5-W LED strings.Index Terms-Current sharing, light-emitting diode (LED), magnetic amplifier.

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Section: Dedicated Dc/dc Converter Methodsmentioning

confidence: 99%

“…2. Unlike the fully isolated master and slave sources approach in [25], the proposed LED driver involves a "common" master voltage source V m for all LED strings and a separate slave voltage source (V s1 -V sn ) for each LED string for current regulation, as shown in Fig. 2 (a).…”

Section: Proposed Led Driver With Master-slave Structurementioning

confidence: 99%

A Dimmable Light-Emitting Diode (LED) Driver With Mag-Amp Postregulators for Multistring Applications

Chen

Hui

2011

IEEE Trans. Power Electron.

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“…In this way, the accuracy of the brightness control of LED can be improved. When the duty cycle of PWM changes, the forward current and brightness go along accordingly, and the control can be approached more linearly [6][7][8][9][10][11].…”

Section: Sun-yu Chan Department Of Electrical Engineeringmentioning

confidence: 99%

Auto mixed light for RGB LED backlight module

Chang

Hung

Tung

et al. 2009

2009 IEEE International Symposium on Industrial Electronics

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To prevent the output white light from being experienced with color deviation due to temperature effect on the performance of light-emitting diode (LED), a mixed-light control module is developed, by integrating Programmable System on Chip (PSoC) with photo-diode sensor devices, to examine the ambient temperature and feedback voltage level of RGB photodiodes. Also, a mixing light color criterion of RGB LED is applied on the mixed-light control module. Through the usage of mixing light color criterion of RGB LED, the corresponding duty cycle of RGB LED can be adjusted, and the stable white light output can, consequently, be achieved. By the feedback compensation of mixed-light control module the CIE1931 xy coordinates of output light are in good agreement with the predicted results.

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“…C ONVENTIONALLY, multiple cold cathode fluorescent lamps (CCFLs) are required to provide sufficient backlighting for large-scale liquid crystal display (LCD) panels [1]- [6]. Growing concerns about environmental issues will exhibit the use of CCFLs that contain poisonous mercury.…”

Section: Introductionmentioning

confidence: 99%

LED Backlight Driving System for Large-Scale LCD Panels

Chiu

Cheng

2007

IEEE Trans. Ind. Electron.

220

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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.Index Terms-Bypass diode, dimming control, light-emitting diode (LED) backlight, power factor, single-stage charge-pump asymmetrical half-bridge (AHB).

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Fast transition current-type burst-mode dimming control for the LED back-light driving system of LCD TV

Cited by 22 publications

References 8 publications

A Dimmable Light-Emitting Diode (LED) Driver With Mag-Amp Postregulators for Multistring Applications

A Dimmable Light-Emitting Diode (LED) Driver With Mag-Amp Postregulators for Multistring Applications

Auto mixed light for RGB LED backlight module

LED Backlight Driving System for Large-Scale LCD Panels

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