US Patent 10276594 Display device and electronic device

A novel display device is provided. The display device includes a pixel portion and a driver circuit for driving the pixel portion. The driver circuit includes a first transistor having a dual-gate structure. The pixel portion includes a second transistor having a single-gate structure and a pixel electrode electrically connected to the second transistor. The first transistor and the second transistor each include a first metal oxide film functioning as a channel. The metal oxide films each include a first region and a second region. The first region contains In or Zn, and oxygen. The second region contains In or an element M, and oxygen. The first region and the second region are dispersed or distributed in a mosaic pattern.