Thin film electrochromic displays

• US 5,028,124 A
• Filed: 03/07/1988
• Issued: 07/02/1991
• Est. Priority Date: 03/07/1988
• Status: Expired due to Fees

• Current Assignee: Akhtar, Masud
• Original Assignee: Akhtar, Masud
• Inventors: Akhtar, Masud
• Primary Examiner(s): Laroche, Eugene R.
• Assistant Examiner(s): Shingleton, Michael
• Application Number:
  US07/165,170
• Time in Patent Office: 1,212 Days
• Field of Search: 350/357, 429/192
• US Class Current: 359/265
• CPC Class Codes: G02F 1/1525 characterised by a particular ion transporting layer, e.g. electrolyte

Abstract

Thin film electrochromic methods and devices which are rigid or flexible and employ moldable solid-state electrolytes formed by combining an organic polymer with an inorganic substance.

Claims

1. An electrochromic display for providing an electrochemical color change, comprising:

a metallic oxide electrochemical material selected from oxides of Group IV, V, VI and VIII metals;

a first electrode in contact with said electrochromic material;

a solid-state anhydrous electrolyte constituted by an organic polymer combined with an inorganic substance, in contact with said electrochromic material; and

a second electrode in contact with said electrolyte.

2. A display as defined in claim 1 wherein said electrochromic material is selected from the class consisting of metal oxyhalides, sulfides, tungstates, molybdates, stannates, vanadates, chromoates, titanates, celinides and tellurides.

3. A display as defined in claim 1 wherein use of the electrodes includes a second electrochromic material in contact with said electrolyte.

4. A display as defined in claim 1 wherein said organic polymer has a molecular weight ranging between 400 and 10,000 and is selected from the class consisting of polymeric imines, oxides, sulphides, halides and alkyls.

5. A display as defined in claim 4, wherein said protonic acid, contains no complex water molecules.

6. A display as defined in claim 4, wherein said protonic acid, is sulfuric.

7. A display as defined in claim 4, wherein said protonic acid, is phosphoric.

8. A display as defined in claim 1 wherein at least one of the electrodes is transparent or opaque and rigid or flexible.

9. A display as defined in claim 1 wherein said electrolyte includes an inert powder selected from the class consisting of silica.

10. A display as defined in claim 1 wherein said inorganic substance is a protonic sulfonic acid.

11. A display as defined in claim 10 wherein said inorganic substance is arylsulfonic acid.

12. A display as defined in claim 11 wherein said inorganic substance is selected from the class consisting of toluene and polystyrene sulfonic acids.

13. A display as defined in claim 1 wherein said inorganic substance is fluorosulfonic.

14. A display as defined in claim 13 wherein said inorganic substance is trifluromethane sulfonic acid.

15. A display as defined in claim 1 wherein said inorganic substance is acetic acid.

16. A display as defined in claim 1 wherein said inorganic substance is a metallic salt selected from the class of alkali metals.

17. A display as defined in claim 1 wherein said inorganic substance is a metallic salt selected from the class of lithium salts, including lithium halide metallic salts.

20. A display as defined in claim 1 wherein said inorganic substance is a metallic salt selected from the class of lithium perchlorates, lithium hexafluoarsenates and lithium trifluoromethanesulfonates.

18. An electrochromic device comprising in combination an electronic conductor, an electrochromic material in contact with said conductor, a solid anhydrous electrolyte formed as a solution phase blend in a mutually miscible solvent of an organic polymer and a protonic acid or salt thereof disposed on said electrochromic material and a counter-electrode in contact with said solid electrolyte.

19. A display as defined in claim 18, wherein said solid electrolyte comprises a blend of

(1) a protonic acid or salt thereof having the generic formula:

space="preserve" listing-type="equation">A(XO.sub.i),

where X is selected from the group consisting of protonic acid metals, A is selected from the group consisting of hydrogen and hydrogen containing compounds, O is an oxidizer and "i" is an integer governed by the valence associated with X, and

(2) a polymer selected from the group consisting of imines, oxides, sulfides, halides, and alkyls.