ORGANIC LIGHT-EMITTING DIODE PIXEL CIRCUIT, DISPLAY APPARATUS AND CONTROL METHOD

摘要

The present disclosure discloses an OLED pixel circuit, a display apparatus, and a control method. The OLED pixel circuit includes an OLED; a driving transistor a drain electrode of which is connected with the OLED; a first switching unit configured to output, during a light-emitting stage, a power source signal to a source electrode of the driving transistor; a second switching unit configured to output, during a present scanning stage, a data signal to a gate electrode of the driving transistor; a compensation unit having a capacitor, and a charging control unit configured to output, during a charging stage, a charging signal to the capacitor for charging the capacitor so that the capacitor can maintain, during the light-emitting stage, a voltage of the gate electrode of the driving transistor. The charging signal has a voltage value greater than an actual voltage value of the data signal.

主权项

1. An organic light-emitting diode (OLED) pixel circuit, comprising:
an OLED; a driving transistor, a drain electrode of which is connected with the OLED; a first switching unit configured to output a power source signal to a source electrode of the driving transistor during a light-emitting stage; a second switching unit configured to output a data signal to a gate electrode of the driving transistor during a present scanning stage; a compensation unit including a capacitor, the compensation unit being connected with the gate electrode of the driving transistor, a first end of the capacitor being connected with the source electrode of the driving transistor, and the compensation unit being configured to maintain a voltage of the gate electrode of the driving transistor during the light-emitting stage so that a current flowing through the OLED has no relation to a threshold voltage Vth of the driving transistor; and a charging control unit configured to output, during a charging stage, a charging signal to the capacitor to charge the capacitor so that the capacitor is capable of maintaining the voltage of the gate electrode of the driving transistor during the light-emitting stage, a voltage value of the charging signal being greater than an actual voltage value of the data signal.