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Device for Maintaining Constant Liquid Pressure in Electrochromic Module

IP.com Disclosure Number: IPCOM000038617D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Cox, AR: AUTHOR [+2]

Abstract

An electrochromic display module contains an enclosed liquid solution. It is found that the rate of loss of water from the module is greater when bubbles or cavitation are present. Bubbles also affect the electrical and optical performance of the cell. The module is therefore maintained at a low positive pressure to prolong lifetime by reducing the extent of solvent loss, at the same time improving performance. This pressure is maintained by a spring-loaded conical diaphragm formed as part of an hermetic seal in one wall of the module. In the illustration of the electrochromic display module, Fig. 1 is a pictorial view while Figs. 2 and 3 are side elevations. The module includes liquid solution 1 trapped between upper glass wall 2 and body 3.

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Device for Maintaining Constant Liquid Pressure in Electrochromic Module

An electrochromic display module contains an enclosed liquid solution. It is found that the rate of loss of water from the module is greater when bubbles or cavitation are present. Bubbles also affect the electrical and optical performance of the cell. The module is therefore maintained at a low positive pressure to prolong lifetime by reducing the extent of solvent loss, at the same time improving performance. This pressure is maintained by a spring-loaded conical diaphragm formed as part of an hermetic seal in one wall of the module. In the illustration of the electrochromic display module, Fig. 1 is a pictorial view while Figs. 2 and 3 are side elevations. The module includes liquid solution 1 trapped between upper glass wall 2 and body 3. A fluorocarbon seal 4, located between glass wall 2 and body 3, includes a large volume conical diaphragm 5. A nipple 6 is molded at the center of diaphragm 5. The nipple locates the upper end of a long movement compression spring 7, while at its lower end it is located by vapor trap 8 in module body 3. As illustrated in Fig. 2, initially a screw 9 is screwed and locked into vapor trap 8 to apply a force to diaphragm 5 via compressed spring 7. Screw 9 must have a sealant applied to its threads to maintain the seal in the vapor trap. Subsequently the spring maintains an almost constant pressure in liquid 1 even if liquid evaporates through diaphragm 5, c...