Patent ID: 7323716

Claim:
A thin film transistor substrate comprising: on an insulating substrate, plural first wiring lines and plural second wiring lines which intersect each other, plural pixels formed beside each point of intersection of said first and second wiring lines, capacitors to retain a signal, pixel switching devices, at least part of a driver circuit to drive a device, wherein said pixel switching devices comprise a first transistor including a gate insulation film containing a multi-layer of a first insulating film and a second insulating film, said driver circuit comprises a second transistor including a gate insulation film containing the first insulating film but not the second insulating film, the gate insulation film of the second transistor being thinner than the gate insulation film of the first transistor, and each said capacitor is to retain a signal is formed with the second insulating film extended from the gate insulation film of the first transistor.