Patent ID: 7724231
Filing Date: 2010-05-25
Classification: G09G

Abstract:
1. A display device comprises: a plurality of pixels; and a common electrode drive circuit, the common electrode drive circuit including k (k≧2) pieces of basic circuits, wherein the n (1≦n≦k)th basic circuit comprising: a first transistor which has a first electrode to which a first input signal is applied and a control electrode to which a (n−1)th scanning line selection signal is applied; a second transistor which has a first electrode to which a second input signal is applied and a control electrode which is connected to the control electrode of the first transistor; a third transistor which has a control electrode which is connected to a second electrode of the first transistor, a first electrode which is connected to an output terminal, and a second electrode to which a first power source voltage is applied; a fourth transistor which has a control electrode which is connected to a second electrode of the second transistor, a second electrode which is connected to the output terminal, and a first electrode to which a second power source voltage is applied; a fifth transistor which has a control electrode which is connected to the second electrode of the first transistor, and a first electrode to which the nth scanning line selection signal is applied; a sixth transistor which has a control electrode which is connected to the second electrode of the second transistor, and a first electrode to which the nth scanning line selection signal is applied; a first capacitive element which is connected between the second electrode of the first transistor and a second electrode of the fifth transistor; a second capacitive element which is connected between the second electrode of the second transistor and a second electrode of the sixth transistor; a seventh transistor which has a control electrode which is connected to the control electrode of the first transistor, a first electrode which is connected to a reference power source line to which a reference potential is supplied, and a second electrode which is connected to a second electrode of the fifth transistor; and an eighth transistor which has a control electrode which is connected to the control electrode of the first transistor, a first electrode which is connected to the reference power source line, and a second electrode which is connected to a second electrode of the sixth transistor; wherein after the (n−1)th scanning line selection signal is changed to a second voltage level at which the first and second transistors are turned on from a first voltage level and, at the same time, before the (n−1)th scanning line selection signal returns to the first voltage level from the second voltage level, one input signal out of the first input signal and the second input signal is changed to the second voltage level from the first voltage level, after an nth scanning line selection signal is changed to the second voltage level from the first voltage level and, at the same time, before the nth scanning line selection signal returns to the first voltage level from the second voltage level, one input signal or another input signal out of the first input signal and the second input signal is changed to the second voltage level from the first voltage level, and when the first input signal is at the second voltage level, the second input signal assumes the first voltage level and when the second input signal is at the second voltage level, the first input signal assumes the first voltage level.