US Patent 7405714 Pixel driving circuit and pixel driving method

A pixel driving circuit for use in an Active Matrix Organic Light Emission Display (AMOLED). A pixel driving method for use in the AMOLED. The pixel driving circuit comprises a current source, a driving pump, and a discharge circuit. A fixed current is provided by the current source. The driving pump coupled to the current source and a Light Emitting Diode (LED), charges a cell to saturation by the fixed current, such that the potential of the cell drives the LED lighting. The discharge circuit, coupled to the driving pump and a data line, controls the cell discharge based on a data signal on the data line. The discharge circuit controls the cell discharge speed, whereby the LED lighting time and luminance is adjusted.