液晶与显示, 2009, 24 (2): 204, 网络出版: 2010-01-22
几种电流型AM OLED像素电路及其电流缩放比的分析
Analyses of Several Current Programmed AM OLED Pixel Circuits and Their Current Scaling Ratio
有源矩阵OLED 电流型像素电路 薄膜晶体管 阈值电压漂移 电流缩放比 active-matrix OLED current programmed pixel circuit thin-film transistor threshold voltage shift current scaling ratio
摘要
分析了4种典型的电流型AM OLED像素驱动电路的工作原理,从中总结出了补偿阈值电压漂移的方法——自动调节存储电容的电压以保证电流不变。着重提出了电流缩放比的定义,对传统结构、电流镜结构、分压结构和电容耦合结构这4种电流型AM OLED像素驱动电路的电流缩放比进行了比较和分析。在这4种电路中,电流缩放比依次增大,显示出电流型像素电路在解决电容充电时间问题上的进步与完善。
Abstract
Four typical current programmed AM OLED pixel circuits are analyzed in this paper,and based on these circuits,compensation method of threshold voltage shift is summarized,i.e. auto-adjusting the voltage stored in the capacitor to supply a constant current. Current scaling ratio is defined,and with its increase,the current programmed AM OLED pixel circuits is improved in solving charging time of capacitor.
王龙彦, 王中健, 马仙梅, 付国柱, 荆海. 几种电流型AM OLED像素电路及其电流缩放比的分析[J]. 液晶与显示, 2009, 24(2): 204. WANG Long-yan, WANG Zhong-jian, MA Xian-mei, FU Guo-zhu, JING Hai. Analyses of Several Current Programmed AM OLED Pixel Circuits and Their Current Scaling Ratio[J]. Chinese Journal of Liquid Crystals and Displays, 2009, 24(2): 204.
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