Patent ID: 9018842
Filing Date: 2015-04-28
Classification: G09G

Abstract:
1. A driving circuit for a pixel unit, for driving an OLED, wherein, the driving circuit for the pixel unit comprises: a driving thin-film transistor, a first switching element, a storage capacitor and a driving control unit; wherein, a first end of said storage capacitor is connected to a gate of said driving thin-film transistor, and a second end of said storage capacitor is connected to a high level output of a driving power supply; a gate of said first switching element is connected to a scan line for transmitting a control signal, a source of said first switching element is connected to the data line, and a drain of said first switching element is connected to the source of said driving thin-film transistor; a source of said driving thin-film transistor is connected to a data line via said first switching element; a drain of said driving thin-film transistor is connected to an anode of said OLED and a low level output of the driving power supply respectively via said driving control unit, a source of said driving thin-film transistor is connected to said high level output of the driving power supply via said driving control unit, and a gate of said driving thin-film transistor is connected to the drain of said driving thin-film transistor via said driving control unit; said driving control unit, for controlling said storage capacitor to be charged and/or discharged to control said driving thin-film transistor to operate in a saturation region, so as to compensate a threshold voltage Vth of said driving thin-film transistor by a gate-source voltage of said driving thin-film transistor; wherein said driving control unit comprises: a second switching element, a third switching element, a fourth switching element and a fifth switching element; a gate of said second switching element is connected to a first control line, a source of said second switching element is connected to the drain of said driving thin-film transistor, and a drain of said second switching element is directly connected to said low level output of the driving power supply; a gate of said third switching element is connected to the scan line, a source of said third switching element is connected to the gate of said driving thin-film transistor, and a drain of said third switching element is connected to the drain of said driving thin-film transistor; a gate of said fourth switching element is connected to a second control line, a source of said fourth switching element is connected to the drain of said driving thin-film transistor, and a drain of said fourth switching element is connected to the anode of said OLED; and a gate of said fifth switching element is connected to said second control line, a source of said fifth switching element is connected to said high level output of the driving power supply, and a drain of said fifth switching element is connected to the source of said driving thin-film transistor.