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CN107393477B 顶发射AMOLED像素电路及其驱动方法 有权

顶发射AMOLED像素电路及其驱动方法
Abstract:
本发明涉及一种顶发射AMOLED像素电路及其驱动方法。该顶发射AMOLED像素电路包括：第一薄膜晶体管(T1)，连接第一节点(G)，第二节点(S)和第三节点(D)；第二薄膜晶体管(T2)，连接扫描信号(Scan)，第一节点(G)和数据信号(Data1)；第三薄膜晶体管(T3)，连接扫描信号(Scan)，第二节点(S)和参考电压(Ref)；第四薄膜晶体管(T4)，连接扫描信号(Scan)，第三节点(D)和电源高电压(Data2)；第一电容(Cst)连接第一节点(G)和第二节点(S)；第二电容(C)连接第三节点(D)和参考电压(Ref)；OLED连接第二节点(S)和电源低电压(VSS)；该电源高电压(Data2)与电源低电压(VSS)之间的差值保持不变。本发明还提供了相应的驱动方法。本发明可以有效缓解透明阴极阻抗增大引起的IR压降。
Abstract(English):

A top-emission AMOLED pixel circuit and a drive method therefor. The top-emission AMOLED pixel circuit comprises: a first thin-film transistor (T1), connecting a first node (G), a second node (S) and a third node (D); a second thin-film transistor (T2) connecting a scanning signal (Scan), the first node (G) and a data signal (Datal); a third thin-film transistor (T3) connecting the scanning signal (Scan), the second node (S) and a reference voltage (Ref); a fourth thin-film transistor (T4) connecting the scanning signal (Scan), a third node (D) and a power source high voltage (Data2); a first capacitor (Cst) connecting the first node (G) and the second node (S); a second capacitor (C) connecting the third node (D) and the reference voltage (Ref); and an OLED connecting the second node (S) and a power source low voltage (VSS). The difference between the power source high voltage (Data2) and the power source low voltage (VSS) remains unchanged. The top-emission AMOLED pixel circuit and the drive method therefor can effectively relieve an IR voltage drop caused by the increase in transparent cathode impedance.

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