Patent ID: 7773057
Filing Date: 2010-08-10
Classification: G09G

Abstract:
1. A display device comprising: a light emitting element; a switching transistor which transmits a data signal in response to a scanning signal; a driving transistor having an input terminal directly electrically connected to a driving signal line, a control terminal directly connected to a source or a drain of the switching transistor, and an output terminal directly connected to the light emitting element, the driving transistor configured to supply a current to the light emitting element in response to an output signal of the switching transistor and a driving signal of the driving signal line; and a first capacitor directly connected between the control terminal of the driving transistor and the driving signal line; and a second capacitor having a first terminal connected directly to the light emitting element and a second terminal connected directly to the control terminal of the driving transistor, wherein the first and the second capacitors transmit a voltage depending on the driving signal and capacitances of the first capacitor and the second capacitor to the control terminal of the driving transistor, a single display frame is divided into three periods comprising a first period for writing data voltages, a second period for emitting light, followed by a third period for applying a reverse biasing voltage, the driving signal includes a first voltage level which turns off the driving transistor in the first period, a second voltage level which turns on the driving transistor in the second period and a third voltage level less than the first voltage level and applied in the third period, and the third voltage level applies a negative biased voltage to the control terminal of the driving transistor and the voltage of the control terminal of the driving transistor during the second period and the third period varies based on capacitive coupling of the first and second capacitors and the driving signal.