一种补偿阈值电压和迁移率变化的像素电路设计  

A pixel circuit to compensate the threshold voltage and mobility variations

作　　者：黄勇[1] 关肖飞 张立文 李月华[1] 王新林 何红宇 HUANG Yong;GUAN Xiaofei;ZHANG Liwen;LI Yuehua;WANG Xinlin;HE Hongyu(Hunan Provincial 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)

出　　处：《智能计算机与应用》2019年第5期13-16,24,共5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)支持;湖南省自然科学基金(2019JJ40246);衡阳市科技局科学研究项目(2016KG75);湖南省研究生科研创新项目资助(CX20190735)

摘　　要：本文通过对数据输入阶段的时序进行调整,改进了一种适用于低温多晶硅薄膜晶体管的电压编程型像素电路,用来得到稳定的驱动电流。该像素电路由4个开关薄膜晶体管,1个驱动薄膜晶体管,2个电容和2条控制线组成。理论分析表明,该电路不仅能补偿驱动管阈值电压的变化,而且能补偿驱动管迁移率的变化。仿真结果表明,驱动管的阈值电压变化±0.5 V时,驱动电流变化约为9%,驱动管的迁移率变化±30%时,驱动电流变化约为6%,因此,本电路达到了稳定驱动电流的效果。A voltage-programming pixel circuit suitable for low-temperature polysilicon thin film transistors is improved to obtain the stable driving current by adjusting the timing in the data input stage.The pixel circuit consists of four switching thin film transistors,one driving thin film transistor,two capacitors,and two control lines.Theoretical analysis shows that the circuit not only can compensate the threshold voltage variation of the driving transistor,but also can compensate the mobility variation of the driving transistor.The simulation results show that,the driving current variation is about 9%when the threshold voltage variation of the driving transistor is±0.5 V,and the variation of the driving current is about 6%when the mobility variation of the driving transistor is±30%.Thus,the present circuit can achieve the stable driving current.

关 键 词：像素电路 多晶硅薄膜晶体管 阈值电压 迁移率 

分 类 号：TN432[电子电信—微电子学与固体电子学]