Patent ID: 8525759

Claim:
A voltage-driving pixel unit, comprising a voltage-driving pixel circuit and an organic light emitting diode (OLED) driven by the voltage-driving pixel circuit, wherein the voltage-driving pixel circuit comprises a gate line, a data line, a power source line, a ground terminal, a switching transistor, a driving transistor, a compensating transistor, a blocking transistor and a storage capacitor, wherein the switching transistor is used to control inputting of a data signal voltage from the data line, a gate electrode of the switching transistor is connected with the gate line, a drain electrode of the switching transistor is connected with the data line, and a source electrode of the switching transistor is connected with a gate electrode of the driving transistor; the compensating transistor is used to pre-store an instant threshold voltage of the driving transistor to the storage capacitor, a gate electrode of the compensating transistor is directly connected with the power source line or a cathode of the OLED, a drain electrode of the compensating transistor is connected with a source electrode of the blocking transistor, and a source electrode of the compensating transistor is connected with source electrode of the switching transistor; the driving transistor is used to provide a driving current to the OLED, a gate electrode of the driving transistor is connected with one side of the storage capacitor, and a source electrode of the driving transistor is connected with the other side of the storage capacitor; and the blocking transistor is used to block a connection between the driving transistor and the power source line, both a gate electrode and a drain electrode of the blocking transistor are directly connected with the power source line or the cathode of the OLED, and a source electrode of the blocking transistor is connected with a drain electrode of the driving transistor.