Patent ID: 7084668
Filing Date: 2006-08-01
Classification: G09G,H01L

Abstract:
1. A display device comprising: a pixel portion comprising at least one pixel over a substrate; and at least one driver circuit over the substrate, comprising first and second input terminals, first and second circuits, and first and second output terminals, wherein transistors that constitute the at least one pixel, the first circuit and the second circuit all have the same polarity, wherein the first output terminal is connected to the first circuit and the second output terminal is connected to the second circuit, wherein a first electric potential or a second electric potential is applied to the first input terminal and the second input terminal, wherein a through current flows in the first circuit only when the voltage applied to the first input terminal and the second input terminal is the first electric potential, wherein, when a signal applied to the second input terminal is the first electric potential, an inverted signal of the first input signal is outputted from the first output terminal, and, at the same time, the first input signal is outputted from the second output terminal, and wherein, when a signal applied to the second input terminal is the second electric potential, an output from the first output terminal and an output from the second output terminal are in a floating state.