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US 4,382,658 AGranted
Use of polysilicon for smoothing of liquid crystal MOS displays
AssigneeHughes Aircraft Company
InventorsSteven E. Shields, Bruce G. Fletcher
Life of this patent
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Abstract
In a liquid crystal imaging display comprising a liquid crystal layer formed over the top surface of a MOS integrated circuit, the reflectivity of the pixel control electrodes is enhanced by means of a polycrystalline silicon layer formed over the MOS integrated circuit and polished to have an optically smooth surface over which the pixel control electrodes and the liquid crystal may be placed. Contrast ratios on the order of 100 to 1 are achieved.
Claims10
A liquid crystal display comprising:
- a semiconductor integrated circuit formed on a semiconductor substrate and having a top surface;
- a polycrystalline silicon layer formed over the top surface of said integrated circuit and divided into islands, said polycrystalline silicon layer having a top surface which is flatter than the top surface of said integrated circuit;
- a plurality of reflective pixel control electrodes each formed over the top surface of an individual one of said polycrystalline silicon islands;
- and
- a liquid crystal layer formed over said pixel control electrodes.
2 more elements
Dependencies are inferred from the claim text.