Patent ID: 6777886
Filing Date: 2004-08-17
Classification: G09G

Abstract:
A digital driving apparatus for active matrix organic light emitting diode (OLED) which consists of a plurality of pixel circuits (10), each of the pixel circuits comprising:a switch unit having two input ends and an output end, the two input ends connecting respectively to a data line and a scan line; a driver unit having two input ends and an output end, the two input ends connecting respectively to a supply line and the output end of the switch unit; a storage unit having one end grounded and another end connecting to a juncture of the output end of the switch unit and the input end of the driver unit; and an OLED having an input end connecting to the output end of the driver unit and an output end grounded; wherein when the pixel circuits scans image data the electric potential of the supply line is connected to zero potential to disable the OLED from lighting and the switch unit is conductive, and the image data enter from the data line into the switch unit; after being scanned by the scan line, the image data are stored in the storage unit, and a zero electric potential is stored in the storage unit when the image data are lighting, otherwise a positive electric potential is stored in the storage unit when the image data are not lighting, and the electric potential of the supply line is connected to the positive electric potential after all scanning operations are completed to allow the OLED of the pixel circuits which has the storage unit at the zero voltage to light.