Organic light-emitting diode display device and pixel circuit thereof

An OLED pixel circuit, comprising:

• a first switch transistor, a driving transistor and an OLED, wherein the first switch transistor, the driving transistor and the OLED are connected in series between a first operating voltage terminal and a second operating voltage terminal, the first switch transistor is controlled by a first signal, and a first terminal and a second terminal of the driving transistor are coupled to the first switch transistor and the OLED respectively, and the driving transistor has a control terminal;
• a second switch transistor, coupled between the first terminal and the control terminal of the driving transistor and controlled by a second signal;
• a third switch transistor, controlled according to a signal at a scan line to convey a signal from a data line to a circuit node;
• a first capacitor, coupled between the circuit node and the control terminal of the driving transistor;
• and
• a switch circuit, controlled according to a third signal to couple the second terminal of the driving transistor to a control voltage level,
• wherein the first signal comprises a first stage enable interval and a second stage enable interval;
• the first stage enable interval of the first signal is prior to an enable interval of the second signal;
• the second stage enable interval of the first signal is later than a pixel data write interval;
• an enable interval of the third signal cover the first stage enable interval of the first signal and the enable interval of the second signal;
• and
• the control voltage level is fixed at a specific voltage level during the enable interval of the second signal to pull down a voltage level at the second terminal of the driving transistor.