Patent ID: 8043901

Claim:
A method for manufacturing a display device comprising the steps of: forming an n-channel thin film transistor and a p-channel thin film transistor over a substrate, wherein the method for forming the n-channel thin film transistor and the p-channel thin film transistor comprises: introducing a reactive gas in a reaction chamber; generating plasma in the reaction chamber by superimposing and applying a first high-frequency power having a frequency with a wavelength of equal to or more than 10 m and a second high-frequency power having a frequency with a wavelength of less than 10 m to an electrode in the reaction chamber; and depositing a microcrystalline semiconductor film over the substrate mounted in the reaction chamber, wherein the microcrystalline semiconductor film is included in at least part of channel formation regions of the n-channel thin film transistor and the p-channel thin film transistor.