Patent ID: 8049684
Filing Date: 2011-11-01
Classification: G09G

Abstract:
1. An organic electroluminescent display device comprising: a display region having a plurality of pixels formed at regions where a plurality of scan lines and a plurality of data lines cross, the pixels coupled to a first power supply voltage line and a second power supply voltage line to display an image thereon; a scan driver for supplying scan signals to the plurality of scan lines and for selecting the plurality of pixels; a plurality of demultiplexers for sequentially supplying data voltages to the plurality of data lines; and a data driver for supplying the data voltages to a plurality of output lines connected to the respective demultiplexers; wherein each of the pixels comprises: a storage capacitor for storing at least one of the data voltages from at least one of the data lines in response to a first one of the scan signals supplied from a first scan line; an auxiliary capacitor connected to the storage capacitor and directly connected to the first scan line, and for generating a compensation voltage to increase the at least one of the data voltages according to a level change of the first one of the scan signals; an initialization transistor having a first electrode connected to a first terminal of the storage capacitor and a second electrode directly connected to an initialization power supply line that is separated from the first power supply voltage line and the second power supply voltage line, and being adapted to turn on by a second one of the scan signals, supplied from a second scan line, to initialize the storage capacitor; a first switching transistor connected to the data line and being adapted to turn on by the first one of the scan signals to transmit the at least one of the data voltages; a driving transistor having a first electrode directly connected to the first switching transistor, a second electrode, and a gate electrode connected to the first terminal of the storage capacitor to generate a driving current; and a second switching transistor directly connected between the first power supply voltage line and the second electrode of the driving transistor, and being adapted to turn on by an emission control signal to supply a first power supply voltage from the first power supply voltage line to the second electrode of the driving transistor; wherein the storage capacitor has a capacitance larger than that of the auxiliary capacitor.