一种兼具阈值电压与迁移率补偿功能的IGZO AM-OLED像素电路  

An IGZO AM-OLED Pixel Circuit with a Function of Both Threshold Voltage and Carrier Mobility Compensation

作　　者：李鼎 王春燕 张超 黄晓东[1] LI Ding;WANG Chunyan;ZHANG Chao;HUANG Xiaodong(Key Laboratory of MEMS of the Ministry of Education,Southeast University,Nanjing Jiangsu 210096,China;Department of Mechanical and Electrical Engineering,Hebei Vocational College of Rail Transportation,Shijiazhuang Hebei 050801,China)

机构地区：[1]东南大学MEMS教育部重点实验室,江苏南京210096 [2]河北轨道运输职业技术学院机电工程系,河北石家庄050801

出　　处：《电子器件》2021年第6期1287-1291,共5页Chinese Journal of Electron Devices

基　　金：江苏省优秀青年基金项目(BK20180060)。

摘　　要：提出一种呈5T2C结构的IGZO AM-OLED像素电路,以改善驱动管状态变化所导致的输出驱动电流稳定性问题。理论分析与仿真结果均表明:该电路不仅能够补偿驱动管阈值电压的漂移,而且能够补偿驱动管迁移率的漂移。基于仿真结果,即使在2V~9 V大范围输入电压信号的条件下,当驱动管的阈值电压变化±2 V时,驱动电流变化约为15.1%,当驱动管的迁移率变化±30%时,驱动电流变化约为9.6%。该像素电路可有效提升驱动电流的稳定性能。A novel IGZO AM-OLED pixel circuit with a 5 T2 C configuration is proposed for improving the driving current stability of the driving thin-film transistor(TFT). Both the theoretical and simulation results suggest that this pixel circuit can not only compensate the threshold voltage change of the driving TFT,but also compensate the carrier mobility change of the driving TFT. Based on the simulation results, even as the input signal varies in a wide range from 2 V to 9 V,the relative driving current variation is only 15.1% when the driving TFT threshold voltage change is between±2 V and the relative driving current variation is only 9.6% when the carrier mobility change is between ±30%. The above results demonstrate the effectiveness of this pixel circuit in improving the stability of the driving TFT current.

关 键 词：有源矩阵有机发光二极管 像素电路 铟镓锌氧化物 薄膜晶体管 补偿 

分 类 号：TN702[电子电信—电路与系统]