Patent ID: 8269218

Claim:
A display device comprising: a first gate electrode; a first gate insulating film over the first gate electrode; an oxide semiconductor film over the first gate insulating film; a source electrode and a drain electrode over the oxide semiconductor film, wherein the source electrode and the drain electrode are electrically connected to the oxide semiconductor film; a second gate insulating film over the source electrode, the drain electrode and the oxide semiconductor film; a second gate electrode over the second gate insulating film; an organic resin film having flatness over the second gate insulating film; a pixel electrode over the organic resin film having flatness, wherein the pixel electrode is electrically connected to either the source electrode or the drain electrode; a first alignment film over and in contact with the second gate electrode and the pixel electrode; a liquid crystal layer over the first alignment film; a second alignment film over the liquid crystal layer; a counter electrode over the second alignment film; and a counter substrate over the counter electrode, wherein a concentration of hydrogen atoms contained in the oxide semiconductor film and measured by secondary ion mass spectrometry is less than 1×10 16 cm −3 .