LED Backlight Driving Circuits and Dimming Method

Kwon, Oh-Kyong; Jung, Young-Ho; Lee, Yong-Hak; Cho, Hyun-Suk; Nam, Ki-Soo; In, Hai-Jung

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자료유형: 학술저널

저자정보: Kwon, Oh-Kyong (Department of Electronic Engineering, Hanyang University) Jung, Young-Ho (Department of Electronic Engineering, Hanyang University) Lee, Yong-Hak (Department of Electronic Engineering, Hanyang University) Cho, Hyun-Suk (Department of Electronic Engineering, Hanyang University) Nam, Ki-Soo (Department of Electronic Engineering, Hanyang University) In, Hai-Jung (Department of Electronic Engineering, Hanyang University)

저널정보: 한국정보디스플레이학회 Journal of information display Journal of information display 제11권 제4호

발행연도: 2010.1

수록면: 173 - 181 (9page)

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In this paper, light-emitting-diode (LED) backlight driving circuits and dimming method for medium-sized and large liquid crystal displays (LCDs) are proposed. The double loop control method, the intelligent-phase-shifted PWM dimming method, the fast-switching current regulator, and the current matching techniques are proposed to improve not only the current regulation characteristics and the power efficiency but also the current matching characteristics and the transient response of the LED current. The brightness of the backlight using the proposed local dimming method was determined from the histogram of the local block to reduce the power consumption of the backlight without image distortion. The measured maximum power efficiency of the LED backlight driving circuit for medium-sized LCDs was 90%, and the simulation results showed an 88% maximum power efficiency of the LED backlight driving circuit for large LCDs. The maximum backlight power-saving ratio of the proposed dimming method was 41.7% in the simulation with a high-contrast image. The experiment and simulation results showed that the performance of LEDs as LCD backlight units (BLUs) improved with the proposed circuits and method.

#LED #backlight #boost converter #current regulator #dimming algorithm

참고문헌 (11)

참고문헌 신청

J. Y. Tsao / 2004 / IEEE Circuits & Devices Mag. :20~28

N. Narendran / 2005 / IEEE J. Display Tech. :167

D. A. Steigerwald / 2002 / IEEE J. Selected Topics In Quantum Electron. 8:310

Y. Hu / 2008 / IEEE Tran. Power Electron. 23:3116

S.-Y. Tseng / 2008 / in Proc. IEEE Appl. Power Electron. Conf. :551

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