Patent ID: 7838882
Filing Date: 2010-11-23
Classification: G02F,H01L

Abstract:
1. A thin-film transistor substrate, comprising: a substrate having an insulating surface; a gate electrode made of a conductive material layer formed on said substrate; a lower electrode of a capacitor made of a same material layer as said gate electrode and formed on said substrate; a first insulating layer formed on said substrate and covering said gate electrode and said lower electrode of the capacitor; a channel layer of high resistivity semiconductor having a concave part of a reduced thickness on a surface above said gate electrode and formed on said first insulating layer over said gate electrode; 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 said lower electrode of the capacitor; a low resistivity source/drain electrode formed on a region on both sides of said concave part of said channel layer; an upper layer of the upper electrode of the capacitor made of a same material layer as said source/drain electrode and formed on said lower layer of the upper electrode of the capacitor; a second insulating layer formed on said first insulating layer and covering said source/drain electrode and said upper layer of the upper electrode of the capacitor; a first connection hole penetrating said second insulating layer and exposing the source/drain electrode; a second connection hole penetrating said second insulating layer and exposing a connection region of said upper layer of the upper electrode of the capacitor; and a pixel electrode formed on said second insulating layer and connected to the source/drain electrode and said upper layer of the upper electrode of the capacitor via said first connection hole and said second connection hole; wherein said channel layer is of a substantially uniform thickness except for said reduced thickness concave part, the lower layer of the upper electrode of the capacitor exists only at a beneath-region right below the second connection hole, and the upper layer of the upper electrode of the capacitor exists directly above the first insulating layer covering said lower electrode of the capacitor, without intermediation of the lower layer of the upper electrode of the capacitor, at a surrounding-region surrounding the beneath-region, the surrounding-region being right above the lower electrode of the capacitor.