Liquid crystal display device and electronic device including the liquid crystal display device

摘要

In a liquid crystal display device including a plurality of pixels in a display portion and configured to performed display in a plurality of frame periods, each of the frame periods includes a writing period and a holding period, and after an image signal is input to each of the plurality of pixels in the writing period, a transistor included in each of the plurality of pixels is turned off and the image signal is held for at least 30 seconds in the holding period. The pixel includes a semiconductor layer including an oxide semiconductor layer, and the oxide semiconductor layer has a carrier concentration of less than 1×1014/cm3.

主权项

1. A semiconductor device comprising:
a first electrode over an insulating surface; an oxide semiconductor layer over the insulating surface and the first electrode; a second electrode over the oxide semiconductor layer; a gate insulating film over the second electrode and the oxide semiconductor layer; and a gate electrode over the gate insulating film, wherein the first electrode surrounds the second electrode in a plain view, wherein the gate electrode comprises a portion which overlaps at least the oxide semiconductor layer between the first electrode and the second electrode.