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Roled小于40 MΩ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％。
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 phe-nomenon.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 compen-sation principle on the OLED degradation and luminance degradation.The key parameters which af-fect 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 MΩ.
参考文献
| [1] | Gary B. Levy;William Evans;John Ebner;Patrick Farrell;Mike Hufford;Bryan H. Allison;David Wheeler;Haiqing Lin;Olivier Prache;Eric Naviasky.An 852×600 pixel OLED-on-silicon color microdisplay using CMOS subthreshold-voltage-scaling current drivers[J].IEEE Journal of Solid-State Circuits,200212(12):1879-1889. |
| [2] | 杜晓刚;王华;刘慧慧;苗艳勤;景姝.基于Ir （ppy）3载流子直接复合发光的OLED机理研究[J].发光学报,2014(4):481-485. |
| [3] | 才华;司玉娟;郎六琪;刘式墉.彩色有源OLED显示屏上像素仿真及外围驱动电路设计[J].发光学报,2006(4):618-623. |
| [4] | 季渊;冉峰;徐洪光;黄舒平;沈伟星.Si基OLED微显示器阳极图案化研究[J].光电子．激光,2012(09):1717-1721. |
| [5] | Yuan Ji;Feng Ran;Hongguang Xu;Weixin Shen;Jimei Zhang.Improved performance and low cost OLED microdisplay with titanium nitride anode[J].Organic electronics,201411(11):3137-3143. |
| [6] | Lin, C.-L.;Chou, K.-W.;Hung, C.-C.;Chang, Y.-C.;Liao, K.-C..Reducing OLED Degradation Using Self-Compensated Circuit for AMOLED Displays[J].IEEE Electron Device Letters,201110(10):1403-1405. |
| [7] | Lee, K.-Y.;Chao, P. C.-.P..A New AMOLED Pixel Circuit With Pulsed Drive and Reverse Bias to Alleviate OLED Degradation[J].IEEE Transactions on Electron Devices,20124(4):1123-1130. |
| [8] | 刘艳艳;耿卫东;代永平;商广辉.硅基OLED像素及驱动电路研究[J].光电子技术,2009(3):201-205. |
| [9] | 冉峰;储楚;季渊;王勇;邹荣.针对OLED衰退补偿的电流PWM像素驱动电路研究[J].液晶与显示,2013(4):534-538. |
| [10] | A New Compensation Method for Emission Degradation in an AMOLED Display Via an External Algorithm, New Pixel Circuit, and Models of Prior Measurements[J].Journal of display technology,20143(3):189-197. |
| [11] | Yuan Ji;Feng Ran;Weigui Ji;Meihua Xu;Zhangjing Chen;Yuxi Jiang;Weixin Shen.Optimal scan strategy for mega-pixel and kilo-gray-level OLED-on-silicon microdisplay[J].Applied optics,201217(17):3731-3743. |
| [12] | 徐美华;陈章进;冉峰;何幼桦.平板显示系统的最优扫描结构及分形模型[J].电子学报,2006(8):1376-1380. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%