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Expansion Diaphragm and Vapor Trap for Display Cell

IP.com Disclosure Number: IPCOM000061108D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Cox, AR: AUTHOR [+2]

Abstract

A liquid-filled electro-optic display cell has an arrangement of display electrodes for displaying an image and a sealed enclosure for enclosing the display electrodes under liquid. The enclosure has a rigid wall structure with at least one aperture therein which is sealed by an elastomeric diaphragm capable of flexing to accommodate expansion or contraction of the liquid. The diaphragm is enclosed externally by an impervious gas-filled chamber which is sealed to the wall structure. This acts as a vapor trap to limit permeation through the expansion diaphragm. One such display cell is shown in part in the drawings. The cell is of the type in which an array of display electrodes (not shown) is formed on a silicon chip 1 supported in a rigid bed 2.

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Expansion Diaphragm and Vapor Trap for Display Cell

A liquid-filled electro-optic display cell has an arrangement of display electrodes for displaying an image and a sealed enclosure for enclosing the display electrodes under liquid. The enclosure has a rigid wall structure with at least one aperture therein which is sealed by an elastomeric diaphragm capable of flexing to accommodate expansion or contraction of the liquid. The diaphragm is enclosed externally by an impervious gas-filled chamber which is sealed to the wall structure. This acts as a vapor trap to limit permeation through the expansion diaphragm. One such display cell is shown in part in the drawings. The cell is of the type in which an array of display electrodes (not shown) is formed on a silicon chip 1 supported in a rigid bed 2. A rigid metal open frame 3 coated with an inert elastomeric molding 4 surrounds the display chip and seals against it by means of ridge seal 5. The cell is completed by means of a top window 6 which clamps the frame 3 against chip 1 and bed 2. The cell is filled, e.g., with an electrochromic solution, by means not shown. To accommodate expansion of the solution, the frame 3 is provided with an expansion diaphragm 7 formed as part of the elastomeric molding 4, which extends across an open area of the frame. The frame defines an expansion chamber 8 above the diaphragm which is in communication with the main display chamber 9 above the silicon chip. Because there is some s...