Patent ID: 9355595
Filing Date: 2016-05-31
CPC Classification: G09G,H05B

Claim Text:
1. A pixel unit driving circuit for driving an organic light emitting diode (OLED), comprising a driving thin film transistor, a matching thin film transistor, a signal-erasing thin film transistor, a charging control unit, a driving control unit and a storage capacitor, wherein the charging control unit comprises a first thin film transistor and a second thin film transistor: a gate of the driving thin film transistor is connected with a first end of the storage capacitor and is connected with a low level output terminal of a driving power supply only via the second thin film transistor, a source thereof is connected with the low level output terminal of the driving power supply directly, and a drain thereof is connected with a cathode of the OLED; a gate and a drain of the matching thin film transistor are connected with a data line via the first thin film transistor, and a source thereof is connected with a second end of the storage capacitor; a gate and a drain of the signal-erasing thin film transistor are connected with the second end of the storage capacitor, a source of the signal-erasing thin film transistor is connected with the gate and the drain of the matching thin film transistor, and is connected with the data line via the first thin film transistor; the second end of the storage capacitor is connected with a high level output terminal of the driving power supply via the driving control unit, and an anode of the OLED is connected to the high level output terminal of the driving power supply; and the driving thin film transistor, the matching thin film transistor and the signal-erasing thin film transistor are n-type TFTs; wherein a gate of the second thin film transistor is connected with the first control line, a source thereof is connected with the low level output terminal of the driving power supply, and a drain thereof is connected with the gate of the driving thin film transistor; and the second thin film transistor is configured to pull down a potential of the gate of the driving thin film transistor so as to turn off the driving thin film transistor during a non-light-emitting period of the OLED.