Pixel circuit, organic electro-luminescent display apparatus, and method of driving the same

摘要

A pixel circuit includes a light emitting device, an N-type driving transistor for outputting a driving current according to a voltage applied to the gate electrode, a first capacitor coupled to a gate electrode of the driving transistor, a second capacitor including a first terminal coupled to the gate electrode of the driving transistor and a second terminal coupled to the first electrode of the light emitting device, and second through sixth N-type transistors. An initialization period is reduced for a driving operation and the threshold voltage compensation time of a driving transistor is controlled.

主权项

1. A pixel circuit comprising:
a light emitting device comprising a first electrode and a second electrode; a driving transistor comprising: a first electrode; a second electrode; and a gate electrode, the driving transistor for outputting a driving current according to a voltage applied to the gate electrode of the driving transistor; a first capacitor comprising a first terminal and a second terminal, the second terminal of the first capacitor being coupled to the gate electrode of the driving transistor; a second capacitor comprising a first terminal coupled to the gate electrode of the driving transistor and a second terminal directly coupled to the first electrode of the light emitting device, the second capacitor being different from the first capacitor; a second transistor comprising: a first electrode coupled to the gate electrode of the driving transistor; a second electrode coupled to the first electrode of the driving transistor; and a gate electrode, wherein the second transistor is configured to be turned on in response to a second scan signal applied to the gate electrode; a third transistor for applying a first power supply voltage to the first electrode of the driving transistor in response to an emission control signal, the third transistor comprising a first electrode directly connected to a first power supply voltage line; a fourth transistor comprising a first electrode for receiving a data signal and a second electrode coupled to the first terminal of the first capacitor, wherein the fourth transistor is configured to be turned on in response to a third scan signal applied to the gate electrode; a fifth transistor comprising: a first electrode directly connected to a reference voltage line for receiving a reference voltage; a second electrode coupled to the first terminal of the first capacitor; and a gate electrode, wherein the fifth transistor is configured to be turned on in response to the second scan signal applied to the gate electrode; and a sixth transistor comprising: a first electrode for receiving a first voltage; a second electrode directly electrically connected to the gate electrode of the driving transistor; and a gate electrode, wherein the sixth transistor is configured to be turned on in response to a first scan signal applied to the gate electrode, wherein the driving transistor and the second to sixth transistors are N-type transistors, and wherein the second electrode of the driving transistor is directly connected to the light emitting device.