Pixel driving circuit, display device and pixel driving method

摘要

The present invention provides a pixel driving circuit, a display device and a pixel driving method. In the pixel driving circuit, the control unit is connected with the data line, a first control line, a second control line, a first gate line and a second gate line; the first charging unit and the second charging unit are both connected with the control unit; a first electrode of the light emitting device is connected with the control unit and the second charging unit, and a second electrode of the light emitting device is connected with the second power supply terminal. According to the present invention, by providing two storage capacitors and improving the pre-charging manner, the gate of the driving transistor is provided with the data voltage lower than the operating voltage. The threshold voltage is stored into the first capacitor, thus the threshold voltage compensation is implemented.

主权项

1. A pixel driving circuit comprising: a light emitting device, a driving transistor, a control unit, a first charging unit, a second charging unit, a first power supply terminal and a second power supply terminal; the control unit is connected with a data line, a first control line, a second control line, a first gate line and a second gate line; the first charging unit and the second charging unit are both connected with the control unit, a gate of the driving transistor is connected with the first charging unit, a drain of the driving transistor is connected with the first power supply terminal, a source of the driving transistor is connected with the control unit; a first electrode of the light emitting device is connected with the control unit and the second charging unit, and a second electrode of the light emitting device is connected with the second power supply; wherein
the control unit is used for charging the first charging unit and the second charging unit in turn based on signals on the first control line, the second control line, the first gate line and the second gate line, such that the voltage across the first charging unit is equal to the threshold voltage of the driving transistor and the voltage across the second charging unit is equal to the data voltage provided by the data line; the first charging unit and the second charging unit are used for providing a driving voltage for the driving transistor under the control of the control unit, the driving voltage is equal to the sum of the threshold voltage of the driving transistor and the data voltage; and the driving transistor is used for driving the light emitting device to emit light.