Patent ID: 9018704
Filing Date: 2015-04-28
Classification: H01L

Abstract:
1. A thin-film transistor comprising: a gate electrode line on a substrate in a first region; a first signal line layer on the substrate in a second region that is different from the first region; a gate insulating film above the substrate, the gate insulating film covering the gate electrode line and the first signal line layer, and the gate insulating film being made of a first dielectric film; bank layers on the gate insulating film, the bank layers each being made of a second dielectric film having a lower permittivity than a permittivity of the first dielectric film; a second signal line layer on one of the bank layers over the first signal line layer; a pair of a drain electrode and a source electrode line which are located on the bank layers which are at least in the first region, and in at least two openings between the bank layers in the first region; a semiconductor layer located at least on the gate insulating film in one of the at least two openings, and banked up by two of the bank layers which are at least in the first region, the drain electrode, and the source electrode line; and a protection film covering the semiconductor layer and banked up by the two of the bank layers, the drain electrode, and the source electrode line, wherein the at least two openings are between the bank layers in a third region and a fourth region which are included in the first region to expose a part of the gate insulating film, the at least two openings include a first opening in the third region and a second opening in the fourth region, the bank layers which are at least in the first region include a first bank layer at a location including a border between the third region and the fourth region and a second bank layer facing the first bank layer via the semiconductor layer, the source electrode line is located on the gate insulating film in the first opening, on the first bank layer, and on a part of the gate insulating film in the second opening, the part of the gate insulating film being closer to the third region than another part of the gate insulating in the second opening, the drain electrode is located on the another part of the gate insulating film in the second opening, and on the second bank layer, the another part of the gate insulating film being closer to the second bank layer than the part of the gate insulating film, the semiconductor layer is located on the gate insulating film in the second opening, and banked up by at least the drain electrode and the source electrode line, and the protection film covers the semiconductor layer and is banked up by at least the drain electrode and the source electrode line.