Browse Prior Art Database

REDUCTION OF LATERAL MIGRATION IN MATRIX ADDRESSED ELECTROPHORETIC DISPLAY

IP.com Disclosure Number: IPCOM000024265D
Original Publication Date: 1980-Feb-29
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 123K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a matrix addressed electrophoretic display panel, one of the image degradation mechanisms is lateral pigment migration which results in blurred image edges. This is caused by the electrohydrodynamics of particle motion and the fringing electric fields. The electrohydrodynamics of movement produces vortex fluid motion in the region between adjacent matrix elements.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 56% of the total text.

Page 1 of 2

CEROX DISCLOSURE JOURNAL

REDUCTION OF LATERAL MIGRATION IN MATRIX ADDRESSED ELECTRO- PHORETIC DISPLAY
Anne Chiang

Proposed Classification

U.S. Cl. 350/362 Int. Cl. G02f 1/11

' /4 I

4 ha' A2-Y d

00 OOOV"

In a matrix addressed electrophoretic display panel, one of the image degradation mechanisms is lateral pigment migration which results in blurred image edges. This is caused by the electrohydrodynamics of particle motion and the fringing electric fields. The electrohydrodynamics of movement produces vortex fluid motion in the region between adjacent matrix elements.

Reduction of lateral pigment migration is accomplished herein by means of a combination of physical barriers and a front electrode biasing scheme.

A typical construction of the improved matrix addressed device is shown in the drawing. The device comprises a bottom wall 10 which may be of glass upon which is disposed addressing electronics such as thin film transistors (TFT) 11 in a matrix array. Row address leads 12 (R1-R6) are connected to the TFT gates while column-

Volume 5 Number 1 January/February 1980 73

I

[This page contains 1 picture or other non-text object]

Page 2 of 2

REDUCTION OF LATERAL MIGRATION IN MATRIX ADDRESSED ELECTROPHOR- ETIC DISPLAY (Con t'd)

address leads 13 (C C ) are connected to the TFT sources. Elongated vertical separators 14, suppohiedon the glass wall 10, extend between the TFT rows. In the completed display device, the separators are somewhat shorter than the available space between the bottom wall 10 and the top wall 15 in order to allow the device to be filled with the electrophoretic suspension after the device is assembled. The top wall 15 may also be made of glass upon which is formed elongated transparent row electrodes 16 (R' R' ) corresponding to the rows R -R6 on the bottom electrodes. Suitable ad&eshng heads 17 are attached to the electrode 16.

An example of the dimensions contempleted for this device is as...