Method of Gray Value Correction in LED Display Screen Based on LED Electroluminescence Response

DENG Hong-gui; LI Zhi-jian; GUO Sheng-wei

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Method of Gray Value Correction in LED Display Screen Based on LED Electroluminescence Response

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- Method of Gray Value Correction in LED Display Screen Based on LED Electroluminescence Response
- Chinese Journal of Luminescence Vol. 31, Issue 1, Pages: 145-149(2010)
- 作者机构：
  
  中南大学物理科学与技术学院,湖南长沙,410083
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN911.73
- Received：11 March 2009，
  
  Revised：02 January 1900，
  
  Published Online：20 February 2010，
  
  Published：20 February 2010
- 稿件说明：
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DENG Hong-gui, LI Zhi-jian, GUO Sheng-wei. Method of Gray Value Correction in LED Display Screen Based on LED Electroluminescence Response[J]. Chinese journal of luminescence, 2010, 31(1): 145-149.
DOI：

DENG Hong-gui, LI Zhi-jian, GUO Sheng-wei. Method of Gray Value Correction in LED Display Screen Based on LED Electroluminescence Response[J]. Chinese journal of luminescence, 2010, 31(1): 145-149. DOI：

摘要

基于发光二极管 (Light-emitting Diode

LED)的电脉冲响应过程

建立了一个简便计算LED电脉冲响应模型。在此模型基础上研究了采用脉宽调制(Pulse-width Modulation

PWM)控制LED亮度时

由于LED响应延迟所导致的发光强度随占空比的非线性误差的变化情况

并进行了实验测试。结果表明:在PWM频率为2.5 MHz时

LED发光强度与占空比的平均非线性误差为10%左右。最后

针对LED电脉冲响应模型

提出了显示屏像素亮度校正方法。该方法有效减小了由LED响应过程所造成的显示屏亮度控制误差

使得LED实际发光强度与所给亮度值近似成线性关系

从而减小了LED显示屏的色彩偏离

增强了显示效果。

Abstract

In this paper

the LED electroluminescence response was analyzed

a simple but useful model of LED voltage pulse response was built. Based on this model

we studied the nonlinear error of LED brightness caused by the voltage-to-intensity response when driven with PWM

and then we conducted an experiment. The test result shows that the average nonlinear error between the LED intensity and the PWM duty is about 10%. At last

a method for gray value correction in LED display screen is suggested based on the LED voltage-to-intensity response model. It effectively reduces the PWM brightness error caused in the process of LED response

makes the LED electroluminescence change linearly along with the pixel gray value

and reduces the color aberration

and furthermore improves the display effect of LED display screen.

关键词

Keywords

references

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