# US 4,392,720 A · Electrochromic display cell

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- Number: US 4,392,720 A
- Document ID: US4392720A
- Status: Granted
- Kind: A
- Application number: 06/211,203
- Filed: 1980-11-28
- Granted: 1983-07-12
- Earliest claimed: 1979-12-17
- Assignees: Ebauches S.A.
- Inventors: Claude Ganguillet; Yves Ruedin; Michel Sallin
- Web page: https://patentgrep.com/patent/US4392720A

## CPC

- G02F 1/161: Gaskets; Spacers; Sealing of cells; Filling or closing of cells
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

An electrochromic display cell comprises a frame interposed between an ionic conductor and an annular soldered zone sealing a cover of the cell to a substrate of the cell. The frame is squeezed between the cover and the substrate to tightly separate the ionic conductor and the solder, preventing any reaction therebetween. In a preferred embodiment, the frame is made of a thermofusible material. It partially melts during the sealing of the cell, adhering thus very tightly to the cover and to the substrate.

## Claims

### Claim 1

An electrochromic display cell comprising a substantially flat substrate, an electrode disposed on said substrate, an electrochromic material disposed on a portion of said electrode, a cover having a substantially flat peripheral portion, an ionic conductor disposed between said substrate and said cover, annular soldering means for sealing said peripheral portion of said cover to said substrate, and a protective frame disposed in tight contact with said substrate and said cover and disposed tightly separating said soldering means and said ionic conductor in order to prevent chemical reaction therebetween.

### Claim 2 (depends on 1)

The cell of claim 1, wherein said frame comprises a thermofusible material partially melted during said sealing for adhering to said cover and to said substrate.