Patent ID: 7515126
Filing Date: 2009-04-07
Classification: G09G

Abstract:
1. A driving circuit for driving a pixel circuit in a display device that includes a plurality of scan lines, at least one data line, and the pixel circuit, wherein the pixel circuit includes an electro-optic element and is disposed in a matrix at each intersection of the scan lines and the at least one data line, said driving circuit comprising: a signal output circuit connected to each data line so as to hold a current value of a reference ON signal that turns on the electro-optic element, said signal output circuit outputting the ON signal to the at least one data line with a current value held according to ON data, and outputting an OFF signal to the at least one data line so as to turn off the electro-optic element according to OFF data; and a control circuit which controls the hold operation of the signal output circuit so as to enable the ON signal to reset its current value within a blanking period in which a display state of all pixel circuits on a selected scan line is set to a non-display state; wherein the signal output circuit holds at least one current value of the ON signal; and the signal output circuit includes: first and second transistors having gate terminals that are connected to each other, and having input terminals that are connected to a common power line; a capacitor connected between the input terminals and the gate terminals of the first and second transistors; and a third transistor having one of an input terminal and an output terminal connected to an output terminal of the first transistor; wherein the capacitor and the first through third transistors include a current mirror structure in which a voltage according to a current that flows through the first transistor is held in the capacitor by controlling a gate voltage of the third transistor with the control circuit, and the held voltage is used to flow a current of the same current value to the first and second transistors.