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首页> 外文期刊>Journal of Information Display >Highly power-efficient and reliable light-emitting diode backlight driver IC for the uniform current driving of medium-sized liquid crystal displays
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Highly power-efficient and reliable light-emitting diode backlight driver IC for the uniform current driving of medium-sized liquid crystal displays

机译：高效节能的可靠发光二极管背光驱动器IC，用于均匀驱动中型液晶显示器

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摘要

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 μm 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.
机译：本文提出了一种用于中型液晶显示器（LCD）的发光二极管（LED）背光驱动器集成电路（IC）。在提出的IC中，还提出了具有匹配内部电阻的线性电流调节器和自适应相移脉宽调制（PWM）调光控制器，以提高LED电流的均匀性和可靠性。双反馈环路控制升压转换器用于实现高功率效率，快速瞬态特性以及高调光频率和分辨率。拟议的集成电路是使用0.35μm双极CMOS-DMOS（BCD）工艺制造的。通过实验验证了所提出IC的LED电流均匀性和LED故障抗扰性。测得的功率效率为90％；测得的LED电流均匀度为97％； LED电流的上升和下降时间分别为86 ns和7 ns。由于具有快速的上升和下降特性，因此所建议的IC可以在高达39 kHz的PWM调光频率下工作，具有8位调光分辨率。验证了当LED故障发生时，PWM调光信号之间的相位差会自适应地改变。实验结果表明，所提出的IC符合中型LCD的LED背光驱动器IC的要求。

著录项

  • 来源
    《Journal of Information Display》 |2012年第2期|p.73-82|共10页
  • 作者

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

  • 作者单位

    Department of Electronic Engineering, Hanyang University, 222 Wangsimni-ro Seongdong-gu, Seoul 133-791, South Korea;

    Department of Electronic Engineering, Hanyang University, 222 Wangsimni-ro Seongdong-gu, Seoul 133-791, South Korea;

    Department of Electronic Engineering, Hanyang University, 222 Wangsimni-ro Seongdong-gu, Seoul 133-791, South Korea;

    Department of Electronic Engineering, Hanyang University, 222 Wangsimni-ro Seongdong-gu, Seoul 133-791, South Korea;

    Department of Electronic Engineering, Hanyang University, 222 Wangsimni-ro Seongdong-gu, Seoul 133-791, South Korea;

    Department of Electronic Engineering, Hanyang University, 222 Wangsimni-ro Seongdong-gu, Seoul 133-791, South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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

    机译：发光二极管;背光升压转换器自适应相移PWM;双反馈回路控制;

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