Technical solutions of some embodiments of the present disclosure will be described clearly and completely hereinafter in conjunction with drawings of the embodiments in the present disclosure. Obviously, the described embodiments are only part, but not all, of the embodiments of the present disclosure. All other embodiments obtained by one skilled in the art without paying any creative labor based on the embodiments of the present disclosure fall into the scope of the present disclosure.
All transistors described in the embodiments of the present disclosure may be thin-film transistors or field effect transistors or other devices having similar characteristics. In the embodiments of the present disclosure, in order to differentiate two electrodes other than the gate electrode of a transistor, one of the two electrodes is called as a first electrode, and the other of the two electrodes is called as a second electrode. In actual applications, the first electrode may be a drain electrode, the second electrode may be a source electrode; or, the first electrode may be the source electrode, and the second electrode may be the drain electrode.