Electrochromic display element and full-color electrochromic display element

• US 7,619,803 B2
• Filed: 04/11/2006
• Issued: 11/17/2009
• Est. Priority Date: 05/31/2005
• Status: Expired due to Fees

• Current Assignee: Konica Minolta Holdings Incorporated (Konica Minolta Inc.)
• Original Assignee: Konica Minolta Holdings Incorporated (Konica Minolta Inc.)
• Inventors: Sakuragi, Rie, Ishige, Osamu, Kokeguchi, Noriyuki
• Primary Examiner(s): Lester; Evelyn A.
• Application Number:
  US11/915,729
• Publication Number:
  US 20090027757A1
• Time in Patent Office: 1,316 Days
• Field of Search: 359265-275, 252/582, 252/583, 252/586
• US Class Current: 359/265
• CPC Class Codes: C09K 2211/1007 Non-condensed systems
• CPC Class Codes: C09K 2211/1033 with oxygen
• CPC Class Codes: C09K 2211/1037 with sulfur
• CPC Class Codes: C09K 2211/1044 containing two nitrogen atoms as heteroatoms
• CPC Class Codes: C09K 9/02 Organic tenebrescent materials
• CPC Class Codes: G02F 1/1516 comprising organic material
• CPC Class Codes: G02F 1/155 Electrodes
• CPC Class Codes: G02F 2001/1555 Counter electrode

Abstract

An electrochromic display element includes a pair of counter electrodes having therebetween an electrochromic compound represented by Formula (1), wherein the electrochromic compound becomes colored when being oxidized and becomes colorless when being reduced by a driving operation of the electrodes:

wherein R₁ represents a substituted or unsubstituted aryl group; and R₂ and R₃ each represent a hydrogen atom or a substituent; X represents >N—R₄, an oxygen atom or a sulfur atom; and R₄ represents a hydrogen atom or a substituent.

Claims

1. An electrochromic display element comprising a pair of counter electrodes having therebetween an electrochromic compound represented by Formula (1),

wherein the electrochromic compound becomes colored when being oxidized and becomes colorless when being reduced by a driving operation of the electrodes:

2. The electrochromic display element of claim 1, wherein X in Formula (1) is >

N—

R₄.

3. The electrochromic display element of claim 1, wherein R₁ in Formula (1) is a substituted or unsubstituted phenyl group.

4. The electrochromic display element of claim 1, wherein R₁ in Formula (1) is a substituted or unsubstituted 2-hyroxyphenyl or 4-hyroxyphenyl group.

5. The electrochromic display element of claim 1, wherein R₂ or R₃ in Formula (1) is a substituted or unsubstituted aryl group.

6. The electrochromic display element of claim 1, wherein R₂ and R₃ in Formula (1) are a substituted or unsubstituted aryl group.

7. The electrochromic display element of claim 1, wherein the electrochromic compound represented by Formula (1), contains a phosphono group.

8. The electrochromic display element of claim 1, wherein at least one of the counter electrodes comprises a layer formed by bonding of transparent conductive microparticles.

9. The electrochromic display element of claim 1, wherein a porous white scattering layer is provided between the counter electrodes.

10. The electrochromic display element of claim 1, wherein the driving operation for the counter electrodes is an active matrix drive.

11. A full-color electrochromic display element comprising a pair of counter electrodes having therebetween a plurality of electrochromic compounds represented by Formula (1),

wherein the electrochromic compounds exhibit a different color with each other when being oxidized, and the electrochromic compounds become colorless when being reduced by a driving operation of the electrodes: