Patent ID: 7527993

Claim:
A method for forming a liquid crystal on silicon display device, the method comprising: providing a semiconductor substrate; forming a transistor layer overlying the substrate, the transistor layer having a plurality of MOS devices, each of the MOS devices including a first contact region and a second contact region; forming an interlayer dielectric layer overlying the transistor layer; planarizing the interlayer dielectric layer to form a planarized surface region; forming a sacrificial layer overlying the planarized surface region of the planarized interlayer dielectric layer; forming a plurality of recessed regions within a portion of the interlayer dielectric layer through the sacrificial layer while other portions of the interlayer dielectric layer remain intact; forming an aluminum layer to fill the recessed regions and overlying remaining portions of the sacrificial layer; selectively removing the aluminum layer overlying portions of the sacrificial layer using lift-off of the sacrificial layer to form a plurality of electrode regions corresponding to each of the recessed regions, each of the electrode regions being respectively coupled to each of the MOS devices among the plurality of MOS devices; and forming a protective layer overlying surface regions of each of the plurality of electrode regions to finish the surface regions to a mirror finish for each of the electrode regions; wherein the aluminum layer is directionally sputtered, the aluminum layer provide within the recess region being free from contact to a vertical region defined by a portion of the sacrificial layer overlying other portions of the interlayer dielectric layer.