High efficiency electrochromic display device

• US 4,093,358 A
• Filed: 12/27/1976
• Issued: 06/06/1978
• Est. Priority Date: 12/27/1976
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Sincerbox, Glenn Tavernia, Shattuck, Meredith David
• Primary Examiner(s): Padgett, Benjamin R.
• Assistant Examiner(s): Gron, T. S.
• Application Number:
  US05/754,303
• Time in Patent Office: 526 Days
• Field of Search: 252/408 R, 252/501, 252/500, 350/160 R, 96/1.5, 96/1.6
• US Class Current: 359/268
• CPC Class Codes: C09K 9/02 Organic tenebrescent materials
• CPC Class Codes: G02F 1/1503 caused by oxidation-reduction reactions in organic liquid solutions, e.g. viologen solutions

Abstract

This invention relates to a reversible display device based upon the electrochromic properties of triaryl pyrazoline compounds when used in conjunction with a complementary redox material.

Claims

1. In a reversible electrochromic display device comprising a reactive medium between two electrically conductive electrodes, at least one of which is transparent, said medium comprising an anhydrous solvent and an oxidant/reductant pair wherein the reductant is an electron acceptor, the improvement according to which the oxidant is a triaryl pyrazoline compound having the formula:

##STR2## wherein A, A¹ and A² are each phenyl or phenyl substituted with an electron releasing group, and n is zero or one.

2. A device as claimed in claim 1 wherein the oxidant is a 1, 3, 5-triphenyl-Δ

² -pyrazoline compound.

3. A device as claimed in claim 1 wherein the oxidant is a 1, 5-diphenyl-3-styryl-Δ

² -pyrazoline compound.

4. A device as claimed in claim 1 wherein the oxidant is 1-p-methoxyphenyl-3-p-diethylaminostyryl-5-p-diethylamino-phenyl-Δ

.sup.2 -pyrazoline.

5. A device as claimed in claim 1 wherein the oxidant is 1-phenyl-3-p-diethylaminostyryl-5-p-diethylaminophenyl-Δ

² -pyrazoline.

6. A device as claimed in claim 1 wherein the oxidant is 1-phenyl-3-p-dimethylaminostyryl-5-p-dimethylaminophenyl-Δ

² -pyrazoline.

7. A device as claimed in claim 1 wherein the oxidant is 1-p-methoxyphenyl-3-p-dipropylaminostyryl-5-p-dipropylaminophenyl-Δ

.sup.2 -pyrazoline.

8. A device as claimed in claim 1 wherein the oxidant is 1-phenyl-3-p-dipropylaminostyryl-5-p-dipropylaminophenyl-Δ

² -pyrazoline.