Patent ID: 8570255
Filing Date: 2013-10-29
Classification: G09G

Abstract:
1. A pixel driving device for driving pixels in accordance with image data, wherein each of the pixels includes a light emitting element, a driving element and a capacitor, wherein the driving element has a control terminal and one end of a current path connected to one terminal of the light emitting element and electrically connected to a signal line, and the capacitor is connected between the control terminal of the driving element and the one end of the current path of the driving element, the pixel driving device comprising: a first measuring circuit which acquires a threshold voltage of the driving element based on a first voltage value at a terminal of the signal line, wherein the first voltage value is acquired after an initial voltage having a second voltage value that exceeds the threshold voltage of the driving element is applied to the terminal of the signal line and a predetermined relaxation time has elapsed after application of the initial voltage to the signal line is cut off; a second measuring circuit which acquires voltage-current characteristics of the driving element and which acquires a current gain value of the driving element based on the acquired voltage-current characteristics of the driving element and the threshold voltage of the driving element acquired by the first measuring circuit; and a correction processing circuit which generates a correction gradation signal by correcting the image data to be supplied from an external source based on the threshold voltage and the current gain value of the driving element acquired by the first measuring circuit and the second measuring circuit, wherein the correction processing circuit sets the correction gradation signal to have a gradation voltage Vdata represented by Formula 1: where Vcode is a voltage value corresponding to a gradation value of the image data, β is the acquired current gain value of the driving element, βm is a predetermined proportional coefficient, and Vth is the acquired threshold voltage of the driving element.