Patent ID: 7619288
Filing Date: 2009-11-17
Classification: G02F,G09G,H01L

Abstract:
1. A thin-film transistor substrate comprising: an insulating transparent substrate; a plurality of island-like semiconductor films formed above the insulating transparent substrate; an insulating gate electrode structure including gate insulating films respectively formed on the island-like semiconductor films, and a gate electrode formed on each of the gate insulating films; a pair of source-drain regions of a first conductive type formed in regions on both sides of the insulating gate electrode structure in a first island-like semiconductor film and a second island-like semiconductor film included in the plurality of island-like semiconductor films; a LDD region of the first conductive type, formed on inner sides of the pair of source-drain regions of the first island-like semiconductor film, partially covered with the gate electrode by leaving a channel region below the gate electrode, and having a lower impurity density than the pair of source-drain regions; and a normally-on channel region of the first conductive type, formed in the second island-like semiconductor film by being connected to the pair of source-drain regions, and having an impurity density substantially equal to the impurity density of the LDD region.