Patent ID: 8129720

Claim:
Metal oxide TFTs on transparent substrates comprising: a transparent substrate having a front surface and a rear surface; opaque gate metal positioned on the front surface of the substrate to define a gate area for a TFT; a layer of transparent gate dielectric deposited on the front surface of the substrate overlying the gate metal and a surrounding area and a layer of transparent metal oxide semiconductor material deposited on the surface of the layer of transparent gate dielectric; a layer of passivation material deposited on the layer of metal oxide semiconductor material; exposed portions of the layer of passivation material removed to leave a passivation area defining a channel area for the TFT overlying the gate area; and conductive material deposited on the layer of metal oxide semiconductor material to form source and drain areas on opposed sides of the channel area using the opaque gate metal as a mask from the rear surface of the substrate.