Patent ID: 7855416

Claim:
A display device including at least one thin film transistor formed over a substrate, the display device comprising: a first silicon oxynitride film (A) formed on the substrate; a second silicon oxynitride film (B) formned on the first silicon oxynitride film (A); a semiconductor layer formed on the second silicon oxynitride film (B); a gate electrode adjacent to the semiconductor layer, the gate electrode comprising at least a first layer of tantalum nitride and a second layer of tungsten formed on the first layer; a leveling film comprising a resin formed over the semiconductor layer; and a pixel electrode formed over the leveling film, wherein a composition ratio of nitrogen, with respect to oxygen, in the first silicon oxynitride film (A) is more than or equal to 0.6, and is less than or equal to 1.5; and a composition ratio of nitrogen, with respect to oxygen, in the second silicon oxynitride film (B) is more than or equal to 0.01, and is less than or equal to 0.4.