# US 10,372,010 B2 · Electrophoretic display fluid comprising five types of particles

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- Number: US 10,372,010 B2
- Document ID: US10372010B2
- Status: Granted
- Kind: B2
- Application number: 16/048,463
- Filed: 2018-07-30
- Published: 2018-11-22
- Granted: 2019-08-06
- Earliest claimed: 2015-05-11
- Assignees: E Ink California, LLC
- Applicants: E Ink California, LLC
- Inventors: Hui Du; Craig Lin
- Web page: https://patentgrep.com/patent/US10372010B2

## CPC

- G02F 1/167: by electrophoresis
- G02F 2001/1678: {characterised by the composition or particle type}
- 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

## Abstract

The present invention is directed to an electrophoretic fluid comprising five different types of particles, wherein each type of particle has a different color and the first, second, and third types of particles carry the same charge polarity.

## Claims

### Claim 1

An electrophoretic fluid comprising a first type of particles, a second type of particles, a third type of particles, a fourth type of particles, and a fifth type of particles, all of which are dispersed in a solvent or solvent mixture, wherein:
(a) the five types of particles are of colors differing from one another;
(b) the first, second and third types of particles carry the same charge polarity;
(c) the first type of particles is black in color, the second type of particles is non-white and non-black and formed of inorganic pigment, and the third type of particles is non-white and non-black and formed of an organic pigment, wherein the second and third types of particles are differently colored and have different surface chemistry, and wherein the first, second, and third types of particles carry different magnitudes of charge from each other;
(d) the fourth and fifth types of particles carry a charge opposite to that carried by the first, second and third types of particles, wherein at least one type of particle includes a surface treatment.

### Claim 2 (depends on 1)

The fluid of claim 1, wherein the first, second and third types of particles are positively charged.

### Claim 3 (depends on 1)

The fluid of claim 1, wherein the second type of particles carries a higher charge than the third type of particles.

### Claim 4 (depends on 1)

The fluid of claim 1, wherein the first type of particles is the highest charged, the third type of particles is the lowest charged and the second type of particles has a charge magnitude between those of the first and third types of particles.

### Claim 5 (depends on 4)

The fluid of claim 4, wherein the fourth and fifth types of particles are negatively charged.

### Claim 6 (depends on 5)

The fluid of claim 5, wherein the magnitude of the fifth type of particles magnitude is lower than that of the fourth type of particles.

### Claim 7 (depends on 1)

The fluid of claim 1, wherein the fourth and fifth types of particles are negatively charged.

### Claim 8 (depends on 1)

The fluid of claim 1, wherein the magnitude of the fifth type of particles magnitude is lower than that of the fourth type of particles.

### Claim 9 (depends on 1)

The fluid of claim 1, wherein at least one type of particle comprises a mixed metal oxide.

### Claim 10 (depends on 1)

The fluid of claim 1, wherein the surface treatment includes an organic silane having a functional group selected from acrylate, vinyl, —NH2, —NCO, and —OH.