Design and implementation of a fault self-detection circuit for LED string

Yan-qing YANG; Chen GUO

doi:10.3788/YJYXS20193404.0402

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Design and implementation of a fault self-detection circuit for LED string

Materials and Devices | 更新时间：2020-07-05

- Design and implementation of a fault self-detection circuit for LED string
- Chinese Journal of Liquid Crystals and Displays Vol. 34, Issue 4, Pages: 402-409(2019)
- 作者机构：
  
  太原航空仪表有限公司, 太原 030006
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20193404.0402
  CLC： TN27
- Received：04 December 2018，
  
  Accepted：14 January 2019，
  
  Published：2019-04
- 稿件说明：
移动端阅览
Yan-qing YANG, Chen GUO. Design and implementation of a fault self-detection circuit for LED string[J]. Chinese journal of liquid crystals and displays, 2019, 34(4): 402-409.
DOI：

Yan-qing YANG, Chen GUO. Design and implementation of a fault self-detection circuit for LED string[J]. Chinese journal of liquid crystals and displays, 2019, 34(4): 402-409. DOI： 10.3788/YJYXS20193404.0402.

摘要

LED背光模组因其具有诸多优势已经成为液晶显示器背光方式的主要选择，而在实际应用当中，若某串LED故障，液晶显示器就会出现暗线，导致亮度均匀性不能满足要求。为了保证液晶显示器的亮度均匀性和后期的维修效率，LED灯串需具备故障自检测的能力。本文设计了一种基于DSP的LED背光模组中灯串故障自检测电路，以546 mm（21.5 in）液晶显示器的直下式LED背光模组为例，设计了灯板、驱动板的具体硬件电路，利用CCS3.1开发工具，C语言编写软件控制逻辑。自检测结果表明：该电路可有效的对LED灯串进行故障自检测，满足了设计的要求。

Abstract

LED backlight module has become the main choice of LCD backlight mode because of its many advantages. But in practical application

if a LED string faults

the LCD will appear dark line

resulting in the brightness uniformity can't meet the requirements. The LED string must have the ability of fault self-detection in order to ensure the brightness uniformity of the LCD and the later maintenance efficiency. A self-detection circuit of the LED string in the LED backlight module based on DSP was designed. Taking the direct-down LED backlight module of 546 mm(21.5 in) LCD as an example

the specific hardware circuits of the LED board and driving board were designed. The software control logic was written by C language using the CCS 3.1 development tool. The self-detection results show that this circuit can detect the fault of the LED string effectively and meet the design requirements.

关键词

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references

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