| abstract |
As the display device becomes high definition, the number of pixels increases, the number of gate lines, and the number of signal lines increase. If the number of gate lines and the number of signal lines increase, it becomes difficult to mount an IC chip having a driver circuit for driving them by bonding or the like, which increases the manufacturing cost. A thin film transistor including a pixel portion and a driving circuit for driving the pixel portion, and at least a part of the circuit of the driving circuit are formed of an oxide semiconductor sandwiching the upper and lower portions by a gate electrode. By providing the pixel portion and the driver circuit on the same substrate, the manufacturing cost is reduced. |