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Electrode for Electrochromic Display

IP.com Disclosure Number: IPCOM000087786D
Original Publication Date: 1977-Mar-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Bowden, LD: AUTHOR [+2]

Abstract

The simplest electrochromic display device consists of an electrochromic material in liquid (solution) or solid form sandwiched in between two electrodes, one of which is transparent. The application of an electrical potential and the resulting current flow causes the coloration of the electrochromic material. If a matrix of electrodes activates the electrochromic material at the desired cross-points, an information display is formed. A good display device should have a high visual contrast between the information display and the background.

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Electrode for Electrochromic Display

The simplest electrochromic display device consists of an electrochromic material in liquid (solution) or solid form sandwiched in between two electrodes, one of which is transparent. The application of an electrical potential and the resulting current flow causes the coloration of the electrochromic material. If a matrix of electrodes activates the electrochromic material at the desired cross- points, an information display is formed. A good display device should have a high visual contrast between the information display and the background.

High visual contrast is provided by a polymeric porous membrane bound to the counter electrode of the electrochromic cell. The membrane is opaque white which covers completely the matrix gold electrodes and the glass substrate on which the gold electrodes evaporated. This membrane permits the complete unhindered flow of the current-carrying ions, but restrains or retards the flow of colored electrochromic species. With the membrane, the colored information display is on white background, vastly improving the visual contrast. The operation of the electrochromic cell is not adversely affected. In fact, preliminary results indicate that there appears to be an unexpected reduction in overall cell resistance, such that equivalent optical density is achieved with lower applied potential.

An example of this porous membrane is made of Elvamide 8063 (brand of polyamide from DuPont) with or without...