Current PWM pixel driving circuit with OLED luminance compensation

JI Yuan; WANG Cheng; RAN Feng; LI Tian; LIU Wan-lin

doi:10.3788/YJYXS20163106.0563

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Current PWM pixel driving circuit with OLED luminance compensation

Driving and Controlling | 更新时间：2020-08-12

- Current PWM pixel driving circuit with OLED luminance compensation
- Chinese Journal of Liquid Crystals and Displays Vol. 31, Issue 6, Pages: 563-568(2016)
- 作者机构：
  
  上海大学微电子研究与开发中心上海
- 作者简介：
- 基金信息：
  
  Supported by National Natural Foundation of China(No.61376028)
- DOI：10.3788/YJYXS20163106.0563
  CLC： TN27
- Received：11 December 2015，
  
  Revised：31 December 2015，
  
  Published：05 June 2016
- 稿件说明：
移动端阅览
季渊, 王成, 冉峰等. 一种支持OLED亮度补偿的电流型PWM像素驱动电路[J]. 液晶与显示, 2016,31(6): 563-568

JI Yuan, WANG Cheng, RAN feng etc. Current PWM pixel driving circuit with OLED luminance compensation[J]. , 2016,31(6): 563-568
季渊, 王成, 冉峰等. 一种支持OLED亮度补偿的电流型PWM像素驱动电路[J]. 液晶与显示, 2016,31(6): 563-568 DOI： 10.3788/YJYXS20163106.0563.

JI Yuan, WANG Cheng, RAN feng etc. Current PWM pixel driving circuit with OLED luminance compensation[J]. , 2016,31(6): 563-568 DOI： 10.3788/YJYXS20163106.0563.

摘要

OLED(organic light-emitting diode

OLED)微显示器长时间工作在高对比度、高亮度的状态下

OLED像素衰退不一致

发光亮度衰退也不一致

会产生残影现象。因此

提出了一种改进的电流型PWM像素驱动电路

保持了对OLED像素衰退补偿效果

同时可以读出OLED阳极电压

计算得到OLED衰退信息

以便于对OLED亮度衰退进行有效的补偿。文章中分析了改进的电流型PWM驱动电路结构

及其对OLED衰退补偿和亮度补偿的原理。通过模拟仿真

得到几个影响OLED衰退补偿效果的关键参数。当OLED像素衰退电阻

oled

小于40 M时

该电流型PWM驱动电路电流衰退度与传统2T1C驱动电路相比

只为其衰退度的50%。

Abstract

OLED microdisplay will suffer the pixel degradation and the luminance degradation after working in the high light and high contrast ratio state for a long time

which induces the ghost phenomenon. Therefore

this article proposes an improved current PWM pixel driving circuit which make compensations for the OLED pixel degradation. At the same time

the proposed circuit can also read the anode voltage of the OLED pixel

so the degree of the OLED degradation can be calculated and the luminance degradation can be compensated. This paper analyses the circuit structure and the compensation principle on the OLED degradation and luminance degradation. The key parameters which affect the OLED degradation compensation are obtained by the simulations. The experiment results show that the ratio of the OLED degradation of the proposed current PWM driving circuit is only 50% of the traditional 2T1C driving circuit when the difference of pixel degradation is less than 40 M.

关键词

Keywords

references

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