Method of manufacturing display element

• US 8,999,430 B2
• Filed: 05/01/2008
• Issued: 04/07/2015
• Est. Priority Date: 05/25/2007
• Status: Active Grant

• Current Assignee: Konica Minolta Holdings Incorporated (Konica Minolta Inc.)
• Original Assignee: Konica Minolta Holdings Incorporated (Konica Minolta Inc.)
• Inventors: Kokeguchi, Noriyuki
• Primary Examiner(s): Murata, Austin
• Application Number:
  US12/600,928
• Publication Number:
  US 20100166946A1
• Time in Patent Office: 2,532 Days
• Field of Search: 427/58
• US Class Current: 427/64
• CPC Class Codes: C09D 11/36 based on non-aqueous solvents
• CPC Class Codes: G02F 1/1503 caused by oxidation-reduction reactions in organic liquid solutions, e.g. viologen solutions
• CPC Class Codes: G02F 1/155 Electrodes
• CPC Class Codes: G02F 1/161 Gaskets; Spacers; Sealing of cells; Filling or closing of cells
• CPC Class Codes: G02F 2001/1518 Ferrocene compounds

Abstract

Disclosed is a method of manufacturing an electrochromic display element having improved durability. Specifically disclosed is a method of manufacturing a display element containing opposed electrodes and a porous layer which is arranged between the opposed electrodes and containing a metal oxide and an electrochromic dye supported on the metal oxide. The method contains the step of applying plural kinds of inks to the porous layer by an inkjet apparatus, wherein the inks are capable of uniformizing the amount of the electrochromic dye supported on the porous layer containing the metal oxide in one pixel of the display element.

Claims

1. A method of manufacturing a display element comprising opposed electrodes having therebetween a porous layer comprising an electrochromic dye and a metal oxide supporting the electrochromic dye, the method comprising the steps of:

(i) applying an ink containing the electrochromic dye on one pixel of a porous layer comprising the metal oxide using an inkjet apparatus;

(ii) applying an ink having a function to desorb the electrochromic dye from the porous layer on the pixel on which the ink containing the electrochromic dye has been applied to dissolve the electrochromic dye in the ink using the inkjet apparatus; and

(iii) applying an ink having a function to readsorb the electrochromic dye to the porous layer on the pixel on which the ink having the function to desorb the electrochromic dye has been applied using the inkjet apparatus,

whereby the electrochromic dye supported by the porous layer comprising the metal oxide in the pixel is uniformly diffused.

2. The method of claim 1, wherein in step (i), the ink containing the electrochromic dye contains water;

wherein in step (ii), the ink having the function to desorb the electrochromic dye from the porous layer contains water; and

wherein in step (iii), the ink having the function to readsorb the electrochromic dye to the porous layer contains water.

3. The method of claim 1, wherein the ink having the function to desorb the electrochromic dye from the porous layer is basic.

4. The method of claim 1, wherein the ink having the function to readsorb the electrochromic dye to the porous layer is acidic.

5. The method of claim 1, wherein the electrochromic dye is at least one compound selected from the group consisting of a compound represented by Formula (A), a compound represented by Formula (B) and a metal complex having a ligand represented by Formula (C):