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BARRIER STRUCTURES FOR PREVENTION OF LATERAL MIGRATION IN ELECTROPHORETIC DISPLAY DEVICES

IP.com Disclosure Number: IPCOM000024308D
Original Publication Date: 1980-Apr-30
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 112K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is an electrophoretic display device provided with internal barrier walls for preventing lateral migration of pigment particles. Such deleterious pigment movement can be caused by particles travelling from an image element under zero field to a neighboring one being driven by a finite voltage. It has been found that the introduction of a barrier grid having the same thickness as the cell is practically impossible to fill and further that any variations in height reduce the the effectiveness of lateral migration prevention. Thus, this improved display device comprises a cell with swellable barrier structures.

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204/299 C1. U.S. Proposed OF LATERAL MIGRATION IN ELECTRO- Classification

Int. C1. Bold 13/02

Mark Zarzycki

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BARRIER STRUCTURES FOR PREVENTION

PHORETIC DISPLAY DEVICES Anne Chiang

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Volume 5 Number 2 March/April 1980 159

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BARRIER STRUCTURES FOR PREVENTION OF LATERAL MIGRATION IN ELEC- TROPHORETIC DISPLAY DEVICES (Cont'd)

Disclosed is an electrophoretic display device provided with internal barrier walls for preventing lateral migration of pigment particles. Such deleterious pigment movement can be caused by particles travelling from an image element under zero field to a neighboring one being driven by a finite voltage. It has been found that the introduction of a barrier grid having the same thickness as the cell is practically impossible to fill and further that any variations in height reduce the the effectiveness of lateral migration prevention. Thus, this improved display device comprises a cell with swellable barrier structures.

The improved cell 10 includes a lower wall 12, which may be of glass, bearing electrode elements 14, which may be of Sn02 running in either the X or Y direction. Peripheral spacers 16 accurately define the gap distance between the lower wall 12 and an upper wall 18 upon which are disposed electrode elements 20, running in an orthogonal direction to 14. A grid structure 22 of a swellable polymeric material is applied to lower wall 12 by photofabrication techniques. The grid, as shown in Figure 1, initially has a height substantially less than the cell height defined by spacers 16. A sealed assembly is formed comprising the lower wall 12 bearin...