Array substrate, method for manufacturing the same, display device, and switching element

A method for manufacturing an array substrate including a substrate having a first surface provided with, in sequence, a light-shielding layer, a first gate electrode, a semiconductor layer, a signal line, and an electrode, the method comprising:

• providing the substrate to which the light-shielding layer, the first gate electrode, and the semiconductor layer are provided such that a first end of the light-shielding layer overlaps the first gate electrode and a second end opposite to the first end does not overlap the first gate electrode in planar view;
• forming a resist layer on the semiconductor layer and performing back-surface exposure of exposing the resist layer from a side of a second surface opposite to the first surface of the substrate with the light-shielding layer and the first gate electrode functioning as a mask for the resist layer;
• and
• performing front-surface exposure of exposing the resist layer from a side of the first surface of the substrate with a mask provided facing the resist layer.

A display device comprising:

• a substrate;
• a light-shielding layer;
• a first gate electrode;
• a semiconductor layer;
• a signal line;
• a pixel electrode;
• a common electrode;
• and
• a display functional layer,
• wherein a first surface of the substrate is provided with, in sequence, the light-shielding layer, the first gate electrode, the semiconductor layer, the signal line, the pixel electrode, and the display functional layer, and the common electrode is opposed to the pixel electrode,
• wherein the semiconductor layer includes
• a first impurity region electrically coupled to the pixel electrode,
• a first channel region overlapping the first gate electrode in planar view,
• a second impurity region opposite to the first impurity region with respect to the first channel region, and
• a first lightly doped drain region provided between the first impurity region and the first channel region,
• wherein the light-shielding layer has a first end and a second end opposite to the first end, and
• wherein the first end is disposed at a position overlapping the first channel region, and the light-shielding layer overlaps a boundary between the first channel region and the first lightly doped drain region.