| 基于LED电脉冲响应的LED显示屏像素灰度校正方法 |
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| 引用本文： | 邓宏贵,李志坚,郭晟伟.基于LED电脉冲响应的LED显示屏像素灰度校正方法[J].发光学报,2010,31(1):145-149. |
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| 作者姓名： | 邓宏贵 李志坚 郭晟伟 |
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| 作者单位： | 中南大学 物理科学与技术学院, 湖南 长沙 410083 |
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| 基金项目： | 国家自然科学基金(60474041);;中南大学2007年“大学生创新创业启航行动”(CY03)资助项目 |
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| 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2.5MHz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。
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| 关 键 词： | LED显示屏 电脉冲响应 脉宽调制 亮度控制 |
| 收稿时间： | 2009-03-11 |
Method of Gray Value Correction in LED Display Screen Based on LED Electroluminescence Response |
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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. |
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| Authors: | DENG Hong-gui LI Zhi-jian GUO Sheng-wei |
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| Institution: | School of Physics Science and Technology, Central South University, Changsha 410083, China |
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| 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 voltag... |
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| Keywords: | LED display screen electroluminescence response PWM brightness control |
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