Patent ID: 6872973
Filing Date: 2005-03-29
Classification: G09G,H01L,H04N

Abstract:
1. An active matrix-type display device comprising a plurality of pixels, said device including a plurality of EL elements, a plurality of EL driving TFTs for controlling light emission of said plurality of EL elements, a plurality of switching TFTs for controlling a driving of said plurality of EL driving TFTs, wherein: said active matrix-type display device comprises a driver circuit comprising a plurality of first thin film transistors over a substrate for the switching TFT; said active matrix-type display device comprises a time division gray-scale data signal generating circuit comprising a plurality of second thin film transistors over the substrate for dividing one frame period into a plurality of sub-frame periods; said active matrix-type display device provides a gray scale display by controlling a period of time at which said plurality of EL elements emit light in one frame period; said plurality of EL elements comprise a first electrode and a second electrode; and a potential of said first or said second electrode changes in such a manner that a polarity of an EL driving voltage is inverted for each one frame period, wherein said EL driving voltage is a difference between said potentials applied to said first and said second electrodes.