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.
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