Driving circuit and method for pixel unit, pixel unit and display apparatus

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 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, and a gate of said driving thin-film transistor is connected to the drain of said driving thin-film transistor;
• 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.