The present invention provides an organic light-emitting diode (OLED). The OLED comprises a driving circuit having a power module and a regulation unit. The power module is used to input an initial voltage to the power input terminal of pixel-driving unit. The regulation unit regulates the initial voltage, which is outputted from the power input terminal, based on the real voltage of the power input terminal in the pixel-driving unit for equalizing the real voltage of the power input terminal to a predetermined voltage.