Thin film transistor array substrate and manufacturing method thereof

A thin film transistor array substrate, comprising:

• a first metal layer having a first portion and a second portion;
• an insulating layer covering the first metal layer;
• a semiconductor layer located on the insulating layer and overlapping the first portion of the first metal layer;
• a second metal layer having a first portion on the semiconductor layer and a second portion on the insulating layer, wherein the second portion of the second metal layer overlaps the second portion of the first metal layer;
• a transparent electrode layer having a first portion and a second portion, wherein the first portion of the transparent electrode layer is disposed along the first portion of the second metal layer, and the second portion of the transparent electrode layer is disposed along the second portion of the second metal layer;
• and
• a passivation layer covering the insulating layer, the second metal layer, and the transparent electrode layer.