| 摘要 |
A pixel structure using a voltage programming type active matrix organic light emitting diode (OLED) which can minimize a current deterioration phenomenon is disclosed. The pixel structure includes a fifth TFT receiving an external management signal EMS through its gate, having a drain region connected to a cathode part of an OLED, and receiving an input of an OLED current through its source-drain current path when the OLED emits light, a fourth TFT receiving a set scan signal SCAN through its gate and having source and drain regions connected to gate and drain parts of a third TFT T 3 , respectively, the third TFT T 3 being a current driving transistor for determining the OLED current when the OLED emits light, a capacitor C having upper and lower plates connected to the gate part of the third TFT T 3 and a ground voltage VSS, respectively, a first TFT receiving the SCAN signal through its gate and transferring a data voltage to a source region of the third TFT T 3 , a second TFT receiving the EMS signal through its gate and connecting the lower part of the capacitor C to the source region of the third TFT T 3 , and a sixth TFT having source and drain regions connected to an external clock signal CLK and the gate region of the third TFT T 3 , respectively, and having a gate connected to the gate part of the third TFT T 3 . An anode part of the OLED receives a voltage VDD.
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