Patent ID: 8405584

Claim:
A method for discharging a thin-film-transistor (TFT) in at least one pixel comprising an electroluminescent element having a terminal electrically connected to a source/drain of the TFT and another terminal, the method comprising: providing a first voltage to a first gate of the TFT and a second voltage to a second gate of the TFT, so that a first voltage difference between the first voltage and the second voltage controls the magnitude of the current flowing through the TFT, wherein after display of an image is finished and before display of a next image, the second voltage turns off the TFT and during the TFT is turned off by the second voltage, in order to discharge the TFT, generating the first voltage corresponding to a pixel voltage of the displayed image; and after display of the image is finished, after the TFT is turned off and before display of the next image, providing a third voltage to the second gate of the TFT, a fourth voltage to the source/drain of the TFT and a fifth voltage to the another terminal of the electroluminescent element, so that a second voltage difference between the third voltage and the first voltage, the fourth voltage and the fifth voltage enable electric charges at a channel to be discharged from the second gate to the first gate and accordingly discharge the TFT after display of an image is finished and before display of the next image, wherein after display of the image is finished and before display of the next image, an electric field is formed between the second gate and the first gate by the third voltage and a magnitude of the electric field is proportional to a magnitude of the display image and enables the channel of the TFT to be discharged.