Patent ID: 9536907
Date: 2017-01-03
CPC Classifications: H01L

Claim:
1. A thin film semiconductor device for use in a display device, the thin film semiconductor device arranged to drive a pixel electrode, with which an image is displayed, according to a signal voltage applied on a signal line, the thin film semiconductor device comprising: a semiconductor layer including a channel region and a pair of contact regions disposed with the channel region therebetween and doped with an impurity at a concentration relatively higher than in the channel region, wherein one of the contact regions is electrically connected to the signal line, while the other is electrically connected to the pixel electrode; a gate electrode disposed at a position facing the channel region of the semiconductor layer; and a light-blocking electrode arranged to block light incident into the channel region, wherein the light-blocking electrode consists of: a first light-blocking electrode disposed opposite to the gate electrode with respect to the semiconductor layer and facing the channel region to block light incident into the channel region; and a second light-blocking electrode disposed opposite to the semiconductor layer with respect to the gate electrode, arranged to block light incident into the channel region, and electrically connected with one of the signal line and the pixel electrode, and wherein the gate electrode is formed in a pair, the pair of gate electrodes electrically connected to each other, and wherein the channel region and the second light-blocking electrode are each formed in a pair correspondingly to the pair of gate electrodes, and wherein one of the pair of second light-blocking electrodes is electrically connected with the signal line, while the other electrically connected with the pixel electrode.