# US 12,181,768 B2 · Light-transmissive conductor with directional conductivity

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- Number: US 12,181,768 B2
- Document ID: US12181768B2
- Status: Granted
- Kind: B2
- Application number: 17/032,002
- Filed: 2020-09-25
- Published: 2021-01-21
- Granted: 2024-12-31
- Earliest claimed: 2018-10-01
- Assignees: E Ink Corporation
- Applicants: E Ink Corporation
- Inventors: Richard J. Paolini, Jr.; Jay William Anseth
- Web page: https://patentgrep.com/patent/US12181768B2

## CPC

- G02F 1/16757: Microcapsules
- D03D 15/533: antistatic; electrically conductive
- D03D 15/54: coloured
- D03D 15/547: with optical functions other than colour, e.g. comprising light-emitting fibres
- G02F 1/167: by electrophoresis
- G02F 1/1677: Structural association of cells with optical devices, e.g. reflectors or illuminating devices
- D10B 2401/20: optical
- 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
- D03D: WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D10B: INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES

## Abstract

Light-transmissive conductors including oriented conductors disposed in a light-transmissive polymer having a volume resistivity between 1×1010 ohm-cm and 1×104 ohm-cm. The oriented conductors typically have very high conductivity along their length. Light-transmissive conductors described herein are well-suited for front electrodes for electro-optic displays, especially elongated displays in the shape of ribbons, stripes, or rulers.

## Claims

### Claim 1

A color-changing fiber comprising:
a central conductive element;
a layer of electro-optic media surrounding the central conductive element, the layer of electro-optic media comprising pigment particles in a solvent enclosed in microcapsules dispersed in a polymer binder; and
an outer layer of light-transmissive conductor, the light-transmissive conductor including:
a light-transmissive polymer doped with a salt, a polyelectrolyte, a polymer electrolyte, or a solid electrolyte and having a volume resistivity between 1×107 ohm-cm and 1×105 ohm-cm, and
an oriented conductive element having an aspect ratio of greater than 10:1(length: width).