Patent ID: 7403176
Filing Date: 2008-07-22
Classification: G09G

Abstract:
1. A display panel for image display using a voltage programming method, said display panel comprising a plurality of data lines for transferring a data voltage representing an image signal, a plurality of scan lines, and a plurality of pixel circuits, each pixel circuit being coupled to a corresponding said data line, a current scan line among the scan lines for transferring a current selection signal and a previous scan line among the scan lines for tranferring a previous selection signal, each pixel circuit comprising: a display element for displaying a portion of an image, the image portion corresponding to a quantity of applied current; a first transistor having a main electrode and a control electrode; a capacitor coupled between the main electrode and the control electrode of the first transistor, wherein the first transistor is for generating the applied current in response to a voltage between the main electrode and the control electrode; a second transistor having a control electrode coupled to the control electrode of the first transistor, the second transistor being configured to operate as a diode; a first switching element coupled to a main electrode of the second transistor, wherein the first switching element transfers the data voltage from the data lines to the second transistor in response to the current selection signal, so as to charge the capacitor with the data voltage; a second switching element for transferring a precharge voltage to the control electrode of the first transistor in response to the previous selection signal before the data voltage is supplied; and a third switching element configured to be turned off in response to the previous selection signal for electrically isolating the first transistor from the display element, so as to prevent a current from being applied to the dispaly element while the capacitor is being charged with the precharge voltage.