Patent ID: 7847796

Claim:
A display device comprising: a plurality of scanning lines; a plurality of data lines intersecting the scanning lines; a plurality of pixels each of which comprises a switching transistor connected to one of the plurality of scanning lines and one of the plurality of data lines, a driving transistor connected to the switching transistor, and an OLED connected to the driving transistor; a data driver which applies data voltages to the data lines; and a scanning driver which applies scanning signals, each having at least three different voltage levels, to the scanning line, wherein the scanning signals comprise a turn-on voltage level which turns on the switching transistor and at least two turn-off voltage levels which turn off the switching transistor, the at least two turn-off voltage levels being different from each other, wherein the data voltages comprise a normal data voltage representing a grayscale and a reverse bias voltage which applies a reverse bias to the driving transistor to display black regardless of the grayscale, and wherein the two turn-off voltage levels comprise a first turn-off voltage level being applied after the normal data voltage is applied and a second turn-off voltage level being applied after the reverse bias voltage is applied.