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Conductively Coated Porous Medium for Use in Electrochromic Membrane Display

IP.com Disclosure Number: IPCOM000085581D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Cuomo, JJ: AUTHOR [+2]

Abstract

Ion selective membranes have been employed in electrochemical display devices for eliminating the development of color forming reactions at the counter electrode during the erasure cycle.

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Conductively Coated Porous Medium for Use in Electrochromic Membrane Display

Ion selective membranes have been employed in electrochemical display devices for eliminating the development of color forming reactions at the counter electrode during the erasure cycle.

In a previously known electrochromic display employing ion selective membranes as shown in Fig. 1, ions are oxidized/reduced at an electrode 1. Unwanted coloration is avoided by use of an ion-exchange membrane 3. Since the ions must be oxidized/reduced at the electrode 1, the speed of the device is greatly enhanced if the ions travel only a short distance.

It is also know that a nontransparent gold coated dendritic material can be used as a porous electrode in order to enhance the speed of the display.

Described is the use of a conductively coated transparent medium for use in the membrane display.

Porous sintered or fritted glass 7 is coated with conducting tin oxide 9 and used in the membrane 5 display as shown in Fig. 2.

This serves to keep the image from diffusing (i.e., the colored ions from rapidly diffusing) and enables improved erasure of the display.

Another material that could be used is "thirsty" glass, a porous glass made by Corning Glass Works.

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