Patent ID: 8988116
Filing Date: 2015-03-24
Classification: G11C,H03K

Abstract:
1. A driving method of a semiconductor device, wherein the semiconductor device comprises a first transistor, a second transistor and a capacitor, wherein a gate of the first transistor, one of a source and a drain of the second transistor and a first terminal of the capacitor are electrically connected to each other to form a node where charge is stored, wherein one of a source and a drain of the first transistor is electrically connected to a first line, wherein the other of the source and the drain of the first transistor is electrically connected to the other of the source and the drain of the second transistor and a second line, wherein a gate of the second transistor is electrically connected to a third line, wherein a second terminal of the capacitor is electrically connected to a fourth line, and wherein the first transistor is a p-channel transistor, the driving method comprising the steps of: setting a potential of the second line at a second level in a holding period; setting a potential of the first line at a first level in a reading period after the holding period; setting a potential of the second line at a third level in a writing period before the holding period so that data “1” is written to the node, or setting a potential of the second line at the first level in the writing period so that data “0” is written to the node; setting a potential of the first line at the first level in the writing period; setting a potential of the third line at a level at which the second transistor is on in the writing period; and setting a potential of the fourth line at the first level in the writing period, wherein a potential at the second level is higher than a potential at the first level, and wherein a potential at the third level is higher than a potential at the second level.