Multicolor display optical composition, optical device, and display method of optical device

• US 8,730,559 B2
• Filed: 08/01/2011
• Issued: 05/20/2014
• Est. Priority Date: 11/25/2005
• Status: Active Grant

• Current Assignee: E Ink Holdings Incorporated
• Original Assignee: Fuji Xerox Company Limited (Xerox Holdings Corp.)
• Inventors: Akashi, Ryojiro, Nakayama, Daisuke
• Primary Examiner(s): Sugarman, Scott J
• Assistant Examiner(s): Choudhury, Mustak
• Application Number:
  US13/195,047
• Publication Number:
  US 20110279885A1
• Time in Patent Office: 1,023 Days
• Field of Search: 359/296, 359/483, 359/485, 359/242, 359/245, 359/267, 359/265, 349/2, 349/78, 315/169.4, 252/582
• US Class Current: 359/296
• CPC Class Codes: G02F 1/133521 Interference filters
• CPC Class Codes: G02F 1/167 by electrophoresis
• CPC Class Codes: G02F 2202/32 Photonic crystals

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

1. A multicolor display optical composition comprising 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 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 applying a stimulus, 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 by light scattering in the coagulation state when the particles are coagulated, and a refractive index of the coagulated particles of the mobile particles is different from a refractive index of the dispersion medium by 0.2 or more.

2. The multicolor display optical composition of claim 1, wherein the mobile particles are selectively arranged in the inside or the outside of the periodic structure.

3. The multicolor display optical composition of claim 1, wherein the mobile particles are particles movable in an electric field or particles movable in a magnetic field.

4. The multicolor display optical composition of claim 1, wherein the mobile particles are at least one kind of particles selected from titanium oxide, silica, and zinc oxide.

5. The multicolor display optical composition of claim 1, wherein the refractive index of the mobile particles is in a range of 0.01 to 3.

6. The multicolor display optical composition of claim 1, wherein the periodic structure is a porous structure.

7. The multicolor display optical composition of claim 1, wherein the periodic structure is a positive working structure selected from a colloidal crystal structure, a micro-domain structure, and a lamellar structure or a negative working structure formed by using these positive working structures as a template.

8. The multicolor display optical composition of claim 1, wherein the material of the periodic structure has a refractive index in a range of 1.3 to 4.0.

9. The multicolor display optical composition of claim 1, wherein the material of the periodic structure is colored.

10. The multicolor display optical composition of claim 1, wherein the material of the periodic structure is not colored.