Highly power-efficient and reliable light-emitting diode backlight driver IC for the uniform current driving of medium-sized liquid crystal displays

Hong, Seok-In; Nam, Ki-Soo; Jung, Young-Ho; Ahn, Hyun-A; In, Hai-Jung; Kwon, Oh-Kyong

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자료유형: 학술저널

저자정보: Hong, Seok-In (Department of Electronic Engineering, Hanyang University) Nam, Ki-Soo (Department of Electronic Engineering, Hanyang University) Jung, Young-Ho (Department of Electronic Engineering, Hanyang University) Ahn, Hyun-A (Department of Electronic Engineering, Hanyang University) In, Hai-Jung (Department of Electronic Engineering, Hanyang University) Kwon, Oh-Kyong (Department of Electronic Engineering, Hanyang University)

저널정보: 한국정보디스플레이학회 Journal of information display Journal of information display 제13권 제2호

발행연도: 2012.1

수록면: 73 - 82 (10page)

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In this paper, a light-emitting diode (LED) backlight driver integrated circuit (IC) for medium-sized liquid crystal displays (LCDs) is proposed. In the proposed IC, a linear current regulator with matched internal resistors and an adaptive phase-shifted pulse-width modulation (PWM) dimming controller are also proposed to improve LED current uniformity and reliability. The double feedback loop control boost converter is used to achieve high power efficiency, fast transient characteristic, and high dimming frequency and resolution. The proposed IC was fabricated using the 0.35 ${\mu}m$ bipolar-CMOS-DMOS (BCD) process. The LED current uniformity and LED fault immunity of the proposed IC were verified through experiments. The measured power efficiency was 90%; the measured LED current uniformity, 97%; and the measured rising and falling times of the LED current, 86 and 7 ns, respectively. Due to the fast rising and falling characteristics, the proposed IC operates up to 39 kHz PWM dimming frequency, with an 8-bit dimming resolution. It was verified that the phase difference between the PWM dimming signals is changed adaptively when LED fault occurs. The experiment results showed that the proposed IC meets the requirements for the LED backlight driver IC for medium-sized LCDs.

#LED #backlight #boost converter #adaptive phase-shifted PWM #double feedback loop control

참고문헌 (13)

참고문헌 신청

A. Peker / 2008 / presented at the Society Information Display

C.-Y. Hsieh / 2008 / presented at the Society Information Display

M. Doshi / 2007 / presented at the Applied Power Electronics Conference and Exposition

S.-Y. Tseng / 2008 / presented at the Applied Power Electronics Conference and Exposition

L. Burgyan / 2004 / US Patent No. 6,690,146