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MASK LEVEL REDUCTION FOR MOFET

  • US 20120235138A1
  • Filed: 05/26/2012
  • Published: 09/20/2012
  • Est. Priority Date: 11/04/2009
  • Status: Active Grant
First Claim
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1. A method of fabricating a thin film transistor and in-plane-switch LCD electrodes with reduced masking operations, the method comprising the steps of:

  • providing a substrate with a surface;

    patterning gate metal on the surface of the substrate to define a thin film transistor gate;

    forming a layer of gate dielectric over the gate and surrounding substrate surface;

    depositing a layer of semiconducting metal oxide on the layer of gate dielectric;

    patterning a channel protection layer on the semiconducting metal oxide overlying the gate, the channel protection layer being patterned to define a channel area in the semiconducting metal oxide above the gate and to expose the remaining semiconducting metal oxide;

    depositing at least a source/drain metal layer on the channel protection layer and a portion of the exposed semiconducting metal oxide defining an in-plane-switch area;

    etching through the source/drain metal layer to the channel protection layer above the gate to separate the source/drain metal layer into thin film transistor source and drain terminals, and etching through the semiconducting metal oxide layer in areas not covered by the source/drain metal layer;

    patterning an organic dielectric material on the thin film transistor source and drain terminals and at surrounding area of the first electrode for the in-plane-switch;

    using the patterned organic dielectric material, etching through the source/drain metal layer in the in-plane-switch area to expose the semiconducting metal oxide and define a first electrode for an in-plane-switch;

    depositing a passivation layer on the patterned organic dielectric material and the first electrode for the in-plane-switch; and

    patterning a layer of transparent electrically conductive material on the passivation layer defining a second electrode for the in-plane-switch overlying the first electrode.

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