| 摘要 |
A thin film transistor using oxide semiconductor for a channel, which may be controlled such that threshold voltage is positive and may be improved in reliability is provided. The thin film transistor includes a gate electrode, a pair of source/drain electrodes, an oxide semiconductor layer forming a channel and provided between the gate electrode and the pair of source/drain electrodes, a first insulating film as a gate insulating film provided on the oxide semiconductor layer on a side near the gate electrode, and a second insulating film provided on the oxide semiconductor layer on a side near the pair of source/drain electrodes. One or both of the first insulating film and the second insulating film includes an aluminum oxide having a film density of 2.70 g/cm3 or more and less than 2.79 g/cm3.
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