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Display Electrode for Electrochromic Display

IP.com Disclosure Number: IPCOM000089810D
Original Publication Date: 1977-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Mansbridge, DS: AUTHOR [+2]

Abstract

A display electrode for an electrochromic display using heptyl viologen dibromide incorporates ruthenium, thereby avoiding corrosion associated with gold electrodes.

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Display Electrode for Electrochromic Display

A display electrode for an electrochromic display using heptyl viologen dibromide incorporates ruthenium, thereby avoiding corrosion associated with gold electrodes.

The base metallurgy 1, which may be the drain pad contact to a thin-film transistor, is of conventional structure, such as chrome-gold-chrome, chrome- silver or chrome-aluminum. Passivation of the substructure is by means of photoresist 2. The display electrode proper consists of an RuO(2) layer 3, about 500 Angstroms thick, deposited by reactive sputtering. This provides adhesion for a 1000 Angstrom layer 4 of evaporated Ru. A rough sublayer 5 of gold is then deposited, on which a 20,000 Angstrom layer 6 of Ru is electroplated, resulting in a surface which is rough textured and white in appearance. Finally, to avoid certain electrochemical diffusion effects associated with ruthenium in heptyl viologen dibromide, a 5000 Angstrom electroplated surface layer 7 of platinum is provided.

Osmium could replace ruthenium, and iridium could be substituted for platinum.

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