Programmable semiconductor switch for a light influencing displa

Details Programmable semiconductor switch for a light influencing displa Programmable semiconductor switch for a light influencing displa

1984-12-10

1987-10-06

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340719, 340784, 340811, G09G 334

Patent

active

046986278

ABSTRACT:
A method of forming a pixel for a liquid crystal display includes forming a pixel electrode on a substrate, depositing a continuous three layer amorphous silicon alloy structure with an intrinsic layer between two n-doped layers, depositing an opaque metal layer over the semiconductor layers and etching the top metal layer and semiconductor layers to form continuous address lines with underlying semiconductor layers and a bidirectional threshold element connected between each electrode and an adjacent overlying address line. A metal pad positioned on each electrode provides for improved conductivity with each adjacent threshold element. The threshold elements have a threshold settable by directing light through each pad, provided the pads are at least partly transmissive. A symmetrical bilateral threshold element is formed of first and second series coupled threshold elements.

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S. Morozumi, et al., "A 250.times.240 Element LCD Addressed by Lateral MIM", Japan Display, 1983, pp. 404-407.

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