Patent ID: 8902206
Filing Date: 2014-12-02
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 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; a positive power supply generation circuit to generate a positive power supply electric potential that is supplied to the vertical drive circuit, wherein the positive power supply electric potential is generated by boosting the power supply electric potential having the first magnitude to a second magnitude that is greater than the first magnitude, and the positive power supply electric potential having the second magnitude is output from the positive power supply generation circuit; a negative power supply generation circuit to generate a negative power supply electric potential that is supplied to the vertical drive circuit, 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 third magnitude, and the negative power supply electric potential having the third 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 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 fourth magnitude of a highest level of positive electric potential of a video signal applied to the pixel electrode, and the third magnitude is greater than a fifth magnitude of a lowest level of negative electric potential of the 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.