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Forming Display Electrodes for Electrochromic Display

IP.com Disclosure Number: IPCOM000052422D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Barclay, DJ: AUTHOR

Abstract

Electrochromic devices consist of a matrix of display electrodes forme by plating a layer of 'rough' silver and etching the layer to form the individual electrodes. Controlling the plating to achieve a desired rough surface has proved to be difficult and the subsequent etching has been found to be one of the limitations on electrode density.

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Forming Display Electrodes for Electrochromic Display

Electrochromic devices consist of a matrix of display electrodes forme by plating a layer of 'rough' silver and etching the layer to form the individual electrodes. Controlling the plating to achieve a desired rough surface has proved to be difficult and the subsequent etching has been found to be one of the limitations on electrode density.

To overcome these problems a matrix of 'rough' silver electrodes is formed by a 'metal displacement' reaction. For example, a layer of silver followed by a layer of copper is deposited by plating or evaporation. The layers are etched to form the matrix of electrodes. As the layers are smooth and the undercutting of the copper layer is not important, electrodes may be delineated at high density. The matrix is now immersed in a silver nitrate solution, and the metal displacement reaction Cu 2Ag/+/ --> Cu/++/ 2Ag. occurs converting the copper into a rough silver deposit. This procedure produces a converted large real area silver surface on a silver metallization layer with a high density of electrodes.

Metals other than silver, e.g., gold, can be deposited in this way, and metals other than copper, e.g., iron or zinc, can be displaced.

Alternatively, the metal displacement reaction could be produced in a silver cyanide solution. Also, two conversion solutions could be used, i.e., silver nitrate followed by silver cyanide, to ensure that all of the copper is displaced. Additio...