Patent ID: 6521475
Filing Date: 2003-02-18
Classification: G02F,H01L

Abstract:
A method of fabricating a Liquid Crystal-on-Silicon (LCoS) backplane, the method comprising:providing a silicon substrate; forming a reflective mirror layer on the silicon substrate; selectively etching the reflective mirror layer to define a crossover pad region, a pixel array region, and a bonding pad region, wherein the crossover pad region comprises a bottom pad made from the reflective mirror layer, the pixel array region comprises a plurality of reflective units made from the reflective mirror layer and a plurality of trenches formed between the reflective units, and the bonding pad region comprises at least one bonding pad made from the reflective mirror layer; filling the trenches with a gap-filling material; depositing a dielectric layer on the crossover pad region, the pixel array region and the bonding pad region; forming a first photoresist layer on the dielectric layer, wherein the first photoresist layer comprising a plurality of openings within the crossover pad region; performing an etching process to remove portions of exposed dielectric layer through the plurality of openings so as to form a plurality of crossover pad vias within the crossover pad region; stripping the first photoresist layer; forming a plurality of plugs in the plurality of the crossover pad vias; forming a top pad over the crossover pad region, wherein the top pad being electrically coupled to the bottom pad via the plugs; forming a second photoresist layer on the silicon substrate to define spacer patterns on the dielectric layer within the pixel array region; and etching the dielectric layer to form a plurality of spacers within the pixel array region.