Patent ID: 7977151

Claim:
A method of fabricating metal oxide TFTs on transparent substrates comprising the steps of: providing a transparent substrate having a front surface and a rear surface; positioning opaque gate metal on the front surface of the substrate to define a gate area for a TFT; depositing a layer of transparent gate dielectric on the front surface of the substrate overlying the gate metal and a surrounding area and a layer of transparent metal oxide semiconductor material on the surface of the layer of transparent gate dielectric; depositing a layer of passivation material on the layer of metal oxide semiconductor material; exposing portions of the layer of passivation material from the rear surface of the substrate and removing exposed portions of the layer of passivation material to leave a passivation area defining a channel area for the TFT overlying the gate area; and depositing conductive material 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.