Patent ID: 9747839
Date: 2017-08-29
CPC Classifications: G09G

Claim:
1. A pixel driving circuit, comprising: a data line, a gate line, a first power supply line, a second power supply line, a reference signal line, a light emitting device, a driving transistor, a storage capacitor, a reset unit, a data writing unit, a compensating unit and a light emitting control unit; the data line is configured to supply a data voltage, the gate line is configured to supply a scan voltage, the first power supply line is configured to supply a first power supply voltage, the second power supply line is configured to supply a second power supply voltage, and the reference signal line is configured to supply a reference voltage, the reset unit comprises a reset control line, a reset signal line, a first transistor and a second transistor, is connected to the reference signal line and the storage capacitor, and is configured to reset a voltage across the storage capacitor to a predefined signal voltage, the data writing unit comprises a fourth transistor, is connected to the gate line, the data line and a second terminal of the storage capacitor, and is configured to write information including a data voltage into the second terminal of the storage capacitor, the compensating unit comprises a third transistor, is connected the gate line, a first terminal of the storage capacitor and the driving transistor, and is configured to write information including a threshold voltage of the driving transistor and the first power supply voltage into the first terminal of the storage capacitor, the light emitting control unit comprises a light emitting control line, a fifth transistor and a sixth transistor, is connected to the reference signal line, the second terminal of the storage capacitor, the driving transistor and the light emitting device, and is configured to write the reference voltage into the second terminal of the storage capacitor during a light emitting period and control the driving transistor to drive the light emitting device to emit light, the first terminal of the storage capacitor is connected to a gate of the driving transistor, and the storage capacitor is configured to transfer the information including the data voltage into the gate of the driving transistor, and the driving transistor is connected to the first power supply line, the light emitting device is connected to the second power supply line, and the driving transistor is configured to control an amplitude of a current flowing through the light emitting device according to the information including the data voltage, the threshold voltage of the driving transistor, the reference voltage and the first power supply voltage under the control of the light emitting control unit.