Patent ID: 9076407
Filing Date: 2015-07-07
Classification: G09G

Abstract:
1. A display device comprising: a pixel portion comprising a plurality of pixel transistors arrayed in a matrix form; a pixel electrode to which a video signal is applied through a pixel transistor, a polarity of the video signal being switched with a predetermined period; a drive circuit to drive the pixel transistors, the drive circuit including a vertical drive circuit for providing a gate signal to turn on and off the pixel transistors and a horizontal drive circuit for providing the video signal; a positive power supply generation circuit to generate a positive power supply electric potential that is supplied to the vertical drive circuit; a negative power supply generation circuit to generate a negative power supply electric potential that is supplied to the vertical drive circuit; a terminal portion to externally provide the positive power supply generation circuit and the negative power supply generation circuit a power supply electric potential having a first magnitude, wherein the negative power supply electric potential is generated by converting the power supply electric potential having the first magnitude to a negative electric potential having a second magnitude, the second magnitude being equal to the first magnitude, and the negative power supply electric potential having the second magnitude is output from the negative power supply generation circuit; a first wiring to supply the power supply electric potential from the terminal portion, the first wiring being arranged between the terminal portion and both the positive power supply generation circuit and the negative power supply generation circuit; a second wiring to supply a horizontal start signal and a horizontal clock from the terminal portion to the horizontal drive circuit, the second wiring portion being arranged between the positive power supply generation circuit and the negative power supply generation circuit; and a substrate on which the pixel portion, the pixel electrode, the drive circuit, the positive power supply generation circuit, the negative power supply generation circuit, the terminal portion, and the first and second wirings are arranged, wherein the second magnitude is greater than a third magnitude of a lowest level of negative electric potential of a video signal applied to the pixel electrode, and wherein the positive power supply generation circuit and the negative power supply generation circuit are arranged closer to the terminal portion than the pixel portion and the drive circuit, and a distance from the terminal portion to the positive power supply generation circuit is substantially the same as a distance from the terminal portion to the negative power supply generation circuit.