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

• US 8,023,176 B2
• Filed: 03/17/2010
• Issued: 09/20/2011
• Est. Priority Date: 11/25/2005
• Status: Expired due to Fees

• Current Assignee: E Ink Corporation (E Ink Holdings Incorporated)
• Original Assignee: Fuji Xerox Company Limited (Fujifilm Holdings Corporation)
• Inventors: Nakayama, Daisuke, Akashi, Ryojiro
• Primary Examiner(s): Choi; Ling
• Assistant Examiner(s): Ahvazi; Bijan
• Application Number:
  US12/725,542
• Publication Number:
  US 20100188732A1
• Time in Patent Office: 552 Days
• Field of Search: 252/582, 359/296, 359/483, 349/2, 315/169.4
• 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 display method for an optical device comprising:

layering the mobile particles at least on the surface of the periodic structure,

and the optical device comprises 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 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 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.

2. The display method of the for an optical device of claim 1 further comprising:

moving the mobile particles to the inside of the porous structure of the periodic structure; and

moving the mobile particles to the outside of the porous structure of the periodic structure.

3. The display method for an optical device of claim 1 for carrying out multicolor display by changing the content of the mobile particles in the pores of the porous structure of the periodic structure.