Method for forming a ferroelectric spatial light modulator utili

Details Method for forming a ferroelectric spatial light modulator utili Method for forming a ferroelectric spatial light modulator utili

1997-03-18

1998-09-29

Powell, William

Etching a substrate: processes

Forming or treating article containing a liquid crystal...

216102, 438697, B44C 122

Patent

active

058142363

ABSTRACT:
A method for forming a spatial light modulator (SLM) comprises forming a substrate (10) underneath a layer of Ferro-Electric crystal material (14) with a plurality of mirrored elements (12) disposed on the surface thereof. The process involves forming a layer of low stress oxide on the surface of the substrate over control pads or conductive strips (24) which are connected to underlying control elements. Openings (30) are formed in the oxide, followed by a formation of a conformal layer of aluminum (32). This is etched to form plugs (36) and then the substrate is subjected to a chemical/mechanical planarization step. This involves polishing the substrate to provide an optically flat surface. Thereafter, a layer of aluminum is then disposed on the surface of the substrate, patterned and etched to form the mirrored elements (12).

REFERENCES:
patent: 5110410 (1992-05-01), Elkind
patent: 5130229 (1992-07-01), Chang et al.
patent: 5437763 (1995-08-01), Huang
patent: 5611941 (1997-03-01), Booth

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