Patent ID: 8502222

Claim:
A display device comprising a thin film transistor comprising: a channel layer; a source electrode electrically connected to said channel layer; a drain electrode electrically connected to said channel layer; and a gate electrode adjacent to said channel layer with a gate insulating film interposed therebetween, said channel layer comprising an oxide semiconductor comprising at least one element selected from In, Ga, and Zn at an atomic ratio of In x Ga y Zn z , wherein a mass density M of said oxide semiconductor is represented by relational expression (1) shown below: M≧ 0.94×(7.121 x+ 5.941 y+ 5.675 z )/( x+y+z ) (1) where 0≦x≦1, 0≦y≦1, 0≦z≦1, and x+y+z≠0.