Patent ID: 9570617
Date: 2017-02-14
CPC Classifications: H01L

Claim:
1. A thin-film transistor (TFT) substrate structure, comprising a base plate, a gate terminal formed on the base plate, a gate insulation layer formed on the base plate and covering the gate terminal, an island-like active layer formed on the gate insulation layer and corresponding to the gate terminal, and a second metal layer formed on the gate insulation layer and the island-like active layer, wherein the second metal layer comprises a first strip-like passage that is located above and corresponds to the gate terminal and a source terminal and a drain terminal respectively formed on two opposite sides of the first strip-like passage; the island-like active layer comprises an amorphous silicon layer and a metal oxide semiconductor layer formed on the amorphous silicon layer, the metal oxide semiconductor layer comprising a second strip-like passage that corresponds to the first strip-like passage and first and second metal oxide semiconductor segments respectively formed on two opposite sides of the second strip-like passage, the amorphous silicon layer comprising a channel zone located under and corresponding to the second strip-like passage, a portion of the amorphous silicon layer that is located in the channel zone having a thickness that is less than or equal to a thickness of a remaining portion thereof; and the source terminal and the drain terminal are respectively in contact engagement with surfaces of the first metal oxide semiconductor segment and the second metal oxide semiconductor segment and the source terminal occupies a surface area of the base plate that is greater than a surface are of the base plate occupied by the first metal oxide semiconductor segment and the drain terminal occupies a surface area of the base plate that is greater than a surface area of the base plate occupied by the second metal oxide semiconductor segment.