Patent ID: 7425931

Claim:
A display unit of a helmet comprising: a pair of transparent substrates comprising a resin, each of said transparent substrates having a curved surface; and a pixel thin film transistor provided over one of said transparent substrates and comprising a source region and a drain region and a channel formation region and a gate electrode, said channel formation region provided between said source region and said drain region, said gate electrode provided adjacent to said channel formation region with a gate insulating film therebetween, wherein at least said channel formation region contains hydrogen atoms at a density of 1×10 20 atoms cm −3 or lower, and contains carbon and nitrogen atoms at a density of 5×10 18 atoms cm −3 or lower, and contains oxygen atoms at a density of 5×10 19 atoms cm −3 or lower, wherein said helmet is provided with a shield; and wherein said display unit is provided over said shield.