一种电压编程型AMOLED像素电路设计  

A voltage programming pixel circuit for AMOLED display

作　　者：张立文 曾涌韬 关肖飞 李月华[1] 王新林 何红宇 ZHANG Liwen;ZENG Yongtao;GUAN Xiaofei;LI Yuehua;WANG Xinlin;HE Hongyu(Hunan Province Key Laboratory for Ultra-Fast Micro-Nano Technology and Laser Advanced Manufacture,University of South China,Hengyang Hunan 421001,China)

机构地区：[1]超快微纳技术与激光先进制造湖南省重点实验室(南华大学),湖南衡阳421001

出　　处：《智能计算机与应用》2020年第10期127-130,共4页Intelligent Computer and Applications

基　　金：超快微纳技术与激光先进制造湖南省重点实验室(2018TP1041);湖南省自然科学基金(2019JJ40246);衡阳市科技局科学研究项目(2016KG75)。

摘　　要：本文改进了一种由5个薄膜晶体管和二个电容(5T2C)构成的电压编程型AMOLED像素驱动电路,用来补偿驱动晶体管的阈值电压和迁移率漂移对OLED驱动电流的影响。通过对电容布局和数据输入阶段时序进行优化,产生一个与驱动晶体管迁移率成正相关的电位变化量,用来补偿迁移率的漂移。仿真结果表明,驱动管阈值电压改变±0.5 V时,驱动电流变化的误差率约为4%;驱动管的迁移率改变±30%时,驱动电流的误差率范围为3%-9%。因此,本电路能有效补偿OLED的驱动电流,解决了AMOLED显示中发光不均匀的问题。The voltage programming pixel circuit with 5 thin-film transistors and 2 capacitors( 5 T2 C) is improved to compensate the effect of the driving transistor’s threshold voltage and mobility shifts for AMOLED display. Optimizing the capacitor placement and the data input period’s timing,the voltage variation proportional to the transistor’s mobility is generated,the voltage variation can compensate the mobility shift. The simulation results show that,when the driving transistor’s threshold voltage changes ±0.5 V,the error rate of the driving current is about 4%;when the driving transistor’s mobility changes 30%,the error rate of the driving current ranges from 3% to 9%. Therefore,the circuit can compensate the OLED’s driving current,effectively,and solve the lighting no uniformity problem in the AMOLED display.

关 键 词：像素电路 电压编程 阈值电压 迁移率 OLED退化 

分 类 号：TN432[电子电信—微电子学与固体电子学]