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Counter Electrode for Electrochromic Display

IP.com Disclosure Number: IPCOM000047751D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Grigg, MJ: AUTHOR [+3]

Abstract

A counter electrode for an electrochromic display is deposited on the inner face of the cover glass of the display cell. The counter electrode consists of an area of platinum black which has been deposited over a layer of gold on titanium conductor metallurgy. As shown in the figure, a platinum black counter electrode 10 is formed on the underside of the cover glass 11 of an electrochromic cell (not shown). The electrode is within the cell liquid enclosures, as defined by a peripheral 0-ring seal, whose position is indicated by dotted lines 12, but does not overlie the display image area. The counter electrode is connected to external circuitry by means of conductor pattern 13 which passes over the 0-ring. The conductor pattern consists of gold over a titanium adhesion layer.

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Counter Electrode for Electrochromic Display

A counter electrode for an electrochromic display is deposited on the inner face of the cover glass of the display cell. The counter electrode consists of an area of platinum black which has been deposited over a layer of gold on titanium conductor metallurgy. As shown in the figure, a platinum black counter electrode 10 is formed on the underside of the cover glass 11 of an electrochromic cell (not shown). The electrode is within the cell liquid enclosures, as defined by a peripheral 0-ring seal, whose position is indicated by dotted lines 12, but does not overlie the display image area. The counter electrode is connected to external circuitry by means of conductor pattern 13 which passes over the 0-ring. The conductor pattern consists of gold over a titanium adhesion layer. The conductor pattern is formed by evaporation through a mask after first cleaning the glass 11 by means of a glow discharged in a nitrogen atmosphere. 200-300 ~ of titanium is then evaporated onto the glass from an electron beam source gun. Subsequently, 1500 ~ of gold is evaporated over the titanium from a heated crucible. The conductor pattern 13 is electroplated with a further 3 microns of gold from a gold potassium cyanide bath to increase its conductivity. Finally, the counter electrode area 10 is defined in a plating jig and platinum black is pulse- plated from a chloroplatinic acid bath for 15 minutes at 10-20 mA/cm-2 . The resultant count...