Patent ID: 7157735

Claim:
A thin-film transistor substrate, comprising: a substrate having an insulating surface; gate electrodes made of a conductive material layer formed on said substrate; lower electrodes of capacitors made of a same material layer as said gate electrodes and formed on said substrate; a first insulating layer formed on said substrate and covering said gate electrodes and said lower electrodes of the capacitors; a channel layer of high resistivity semiconductor having a concave part of a reduced thickness on a surface above each of said gate electrodes and formed on said first insulating layer over each of said gate electrodes; a lower layer of an upper electrode of the capacitor having no concave part on a surface, made of a same material layer as said channel layer, and formed on said first insulating layer above each of said lower electrodes of the capacitors, with said lower layer of the upper electrode being patterned to be located in a connection region; a pair of low resistivity source/drain electrodes formed on regions on both sides of each of said concave parts of said channel layers; an upper layer of the upper electrode of the capacitor made of a same material layer as said source/drain electrodes and formed to envelope said lower layer of each of the upper electrodes of the capacitors; a second insulating layer formed on said first insulating layer and covering said source/drain electrodes and said upper layer of the upper electrode of the capacitor; a first connection hole penetrating said second insulating layer and exposing one of each of said pair of the source/drain electrodes; a second connection hole penetrating said second insulating layer and exposing a connection region of each of said upper layers of the upper electrode of the capacitor above said lower layer; and a pixel electrode formed on said second insulating layer and connected to said one of the source/drain electrodes and said upper layer of the upper electrode of the capacitor via said first connection hole and said second connection hole.