Patent ID: 7629612
Filing Date: 2009-12-08
Classification: G02F,H01L

Abstract:
1. A personal computer comprising: a keyboard; a pixel portion comprising a fifth transistor over a substrate; a driver circuit over the substrate comprising first, second, third and fourth transistors and a capacitance means; wherein the first, second, third, fourth and fifth transistors are the same conductivity type, wherein a first electrode of the capacitance means is electrically connected to a first signal input terminal, and a second electrode of the capacitance means is electrically connected to a gate electrode of the first transistor, wherein a gate electrode of the second transistor is electrically connected to a second signal input terminal, wherein an input electrode of the first transistor is electrically connected to a first power supply, and an output electrode of the first transistor is electrically connected to a signal output terminal, wherein an input electrode of the second transistor is electrically connected to a second power supply, and an output electrode of the second transistor is electrically connected to the signal output terminal, wherein a gate electrode and an output electrode of the third transistor are electrically connected to the signal output terminal, and input electrode of the third transistor is electrically connected to the second electrode of the capacitance means, and wherein a gate electrode and an output electrode of the fourth transistor are electrically connected to the second electrode of the capacitance means, and an input electrode of the fourth transistor is electrically connected to the first electrode of the capacitance means.