| abstract |
The number of pixels increases, the number of gate lines and the number of signal lines increase with the increase in definition of a display device. When the number of gate lines and the number of signal lines increase, it becomes difficult to mount an IC chip having a drive circuit for driving them by bonding or the like, which increases the manufacturing cost. A pixel portion and a driver circuit for driving the pixel portion are provided over the same substrate, and at least a part of the driver circuit includes a thin film transistor using an oxide semiconductor sandwiched between upper and lower gate electrodes. To do. Manufacturing cost is reduced by providing a pixel portion and a driver circuit over the same substrate. [Selection] Figure 1 |