Threshold voltage compensating pixel circuit and organic light emitting display using the same

摘要

A pixel includes an organic light emitting diode (OLED), a first transistor having a gate electrode coupled to a first node, a first electrode coupled to a first power supply, and a second electrode coupled to the OLED, a first capacitor for storing a data signal, and a second capacitor coupled between the first node and the second electrode of the first transistor to charge a voltage corresponding to the data signal and a threshold voltage of the first transistor, wherein, in a period where a voltage stored in the first capacitor is supplied to the first node, the second capacitor is electrically blocked from the first node.

主权项

1. A pixel, comprising:
an organic light emitting diode (OLED); a first transistor having a gate electrode coupled to a first node, a first electrode coupled to a first power supply, and a second electrode coupled to the OLED; a first capacitor for storing a data signal; a second capacitor coupled between the first node and the second electrode of the first transistor, the second capacitor to charge a voltage corresponding to the data signal and a threshold voltage of the first transistor; a second transistor coupled between a data line and a first terminal of the first capacitor, the second transistor being turned on when a scan signal is supplied to a scan line; a third transistor coupled between the first terminal of the first capacitor and the first node, the third transistor being turned on when a second control signal is supplied; a fourth transistor coupled between the first node and a first terminal of the second capacitor, the fourth transistor having a turn on period that does not overlap a turn on period of the third transistor, the fourth transistor being turned off when an emission control signal is supplied; a fifth transistor coupled between the first terminal of the second capacitor and the data line, the fifth transistor being simultaneously turned on and off with the third transistor; a sixth transistor coupled between the first terminal of the second capacitor and the data line, the sixth transistor having a turn on period that does not overlap a turn on period of the fifth transistor; a seventh transistor coupled between a second terminal of the second capacitor and an initializing power supply, the seventh transistor being simultaneously turned on and off with the sixth transistor; and an eighth transistor coupled between the second electrode of the first transistor and the OLED, the eighth transistor being simultaneously turned on and off with the fourth transistor, wherein, in a period where the data signal stored in the first capacitor is supplied to the first node, the second capacitor is electrically blocked from the first node.