Patent ID: 8603841
Filing Date: 2013-12-10
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device comprising the steps of: forming a first conductive film over a substrate; forming a first resist mask over the first conductive film; forming a first gate electrode and a second gate electrode by selectively etching the first conductive film with the use of the first resist mask; forming a first insulating film over the first gate electrode and the second gate electrode; forming a semiconductor film over the first insulating film; forming a second resist mask over the semiconductor film; forming a first opening by selectively etching part of the semiconductor film and the first insulating film over the second gate electrode with the use of the second resist mask; forming a second conductive film so as to cover the semiconductor film and the first opening; forming a third resist mask over the second conductive film; forming a first source electrode, a first drain electrode, a second source electrode and a second drain electrode by selectively etching the second conductive film with the use of the third resist mask, wherein a first transistor comprises the first gate electrode, the first source electrode and the first drain electrode, wherein a second transistor comprises the second gate electrode, the second source electrode and the second drain electrode, wherein one of the first source electrode and the first drain electrode is electrically connected to a source or drain wiring, wherein the other of the first source electrode and the first drain electrode is electrically connected to the second gate electrode, and wherein one of the second source electrode and the second drain electrode is electrically connected to a power source wiring; forming a second insulating film over the first source electrode and the first drain electrode, the second source electrode and the second drain electrode, and the semiconductor film; forming a fourth resist mask over the second insulating film; forming a second opening by selectively etching the second insulating film and the semiconductor film with the use of the fourth resist mask and simultaneously forming a third opening in the second insulating film so as to expose part of the other of the second source electrode and the second drain electrode; forming a third conductive film over the second insulating film so as to cover the third opening; forming a fifth resist mask over the third conductive film; and forming a pixel electrode by selectively etching the third conductive film with the use of the fifth resist mask.