# US 7,746,542 B2 · Multicolor display optical composition, optical device, and display method of optical device

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- Number: US 7,746,542 B2
- Document ID: US7746542B2
- Status: Granted
- Kind: B2
- Application number: 11/438,250
- Filed: 2006-05-22
- Published: 2007-05-31
- Granted: 2010-06-29
- Earliest claimed: 2005-11-25
- Assignees: Fuji Xerox Co., Ltd.
- Inventors: Ryojiro Akashi; Daisuke Nakayama
- Web page: https://patentgrep.com/patent/US7746542B2

## CPC

- G02F 1/167: by electrophoresis
- G02F 1/133521: {Interference filters}
- G02F 2202/32: Photonic crystals
- 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 provides a multicolor display optical composition comprising a dispersion medium, a periodic structure having a porous structure inside communicated with the outside, and mobile particles contained in the dispersion medium so as to be movable and having a volume average primary particle diameter from 1 nm to 80 nm in a dispersion state in the dispersion medium, a volume average particle diameter of coagulated particles of 100 nm or larger in optical coagulation state by stimulation application, and having a refractive index different from that of the dispersion medium by 0.1 or more, wherein the mobile particles show no coloration in the dispersion state when the particles are dispersed in the dispersion medium and show white coloration with a predetermined whiteness value or higher in the coagulation state when the particles are coagulated, an optical device, and a display method of the optical device.

## Claims

### Claim 1

An optical device comprising a pair of substrates, and between the substrates are arranged a light transmissive dispersion medium, a periodic structure arranged in the dispersion medium and having a porous structure inside communicated with the outside, and mobile particles contained in the dispersion medium so as to be movable and having a volume average primary particle diameter of 1 nm or larger and 80 nm or smaller in the dispersion state in the dispersion medium, a volume average particle diameter of coagulated particles of 100 nm or larger in optical coagulation state by applying a voltage, and having a refractive index different from that of the dispersion medium by 0.1 or more, the mobile particles being present in the dispersion medium irrespective of said voltage.

### Claim 2 (depends on 1)

The optical device of claim 1 further comprising a layering unit for layering the mobile particles on the surface of the periodic structure.

### Claim 3 (depends on 2)

The optical device of claim 2, wherein the layering unit includes a selective arrangement unit for selectively arranging the mobile particles in the inside or the outside of the porous structure of the periodic structure.

### Claim 4 (depends on 2)

The optical device of claim 2, wherein the layering unit is an electric field application unit or a magnetic field application unit.

### Claim 5 (depends on 1)

The optical device of claim 1, wherein one of the substrates of the pair of substrates is colored or has a colored body.