Patent ID: 8669791
Filing Date: 2014-03-11
Classification: G11C,H03F,H03K

Abstract:
1. A display device comprising: a pixel portion over a substrate; and a source follower circuit over the substrate, the source follower circuit comprising: wherein the first thin film transistor and the second thin film transistor have the same polarity, wherein a gate of the first thin film transistor is directly connected to one terminal of the first capacitor and one terminal of the sixth switch, wherein the other terminal of the first capacitor is directly connected to one terminal of the first switch and one terminal of the second switch, wherein the other terminal of the second switch is directly connected to one of a source and a drain of the first thin film transistor, one of a source and a drain of the second thin film transistor, one terminal of the third switch, and one terminal of the fourth switch, wherein the other of the source and the drain of the first thin film transistor is directly connected to one terminal of the fifth switch, wherein the other terminal of the fourth switch is directly connected to a gate of the second thin film transistor and one terminal of the second capacitor, wherein the other terminal of the second capacitor is directly connected to the other of the source and the drain of the second thin film transistor, wherein the other of the source and the drain of the second thin film transistor is directly connected to a first power supply line, wherein the other terminal of the fifth switch is directly connected to a second power supply line, wherein the other terminal of the first switch is directly connected to an input terminal, wherein the other terminal of the third switch is directly connected to an output terminal, wherein the pixel portion comprises a third thin film transistor and a display element, wherein the third thin film transistor is electrically connected to the display element, and wherein the source follower circuit is operationally connected to the pixel portion.