An exemplary active matrix organic light emitting diode (OLED) display includes a data line, a current sensing line, a power line and a plurality of pixels all electrically coupled to the data line, the current sensing line and the power line. During a data current is writing to a selected one of the pixels, the selected pixel draws a current from the current sensing line, and the data line supplies a particular data voltage to the selected pixel according to the drawn current from the current sensing line until the drawn current matched with the data current; the other non-selected pixels draw currents from the power line for light-emission. Moreover, a pixel circuit and a data current writing method adapted for the above-mentioned active matrix OLED display also are provided.