Electrochromic display device

• US 4,239,350 A
• Filed: 04/18/1979
• Issued: 12/16/1980
• Est. Priority Date: 04/24/1978
• Status: Expired due to Term

• Current Assignee: Tokyo Shibaura Denki Kabushiki Kaisha (Toshiba Corporation)
• Original Assignee: Tokyo Shibaura Denki Kabushiki Kaisha (Toshiba Corporation)
• Inventors: Morita, Hiroshi, Washida, Hiroshi
• Primary Examiner(s): Davie, James W.
• Application Number:
  US06/031,877
• Time in Patent Office: 608 Days
• Field of Search: 350/357
• US Class Current: 359/272
• CPC Class Codes: G02F 1/1524 Transition metal compounds
• CPC Class Codes: G02F 1/1533 structural features not otherwise provided for
• CPC Class Codes: G02F 1/161 Gaskets; Spacers; Sealing of cells; Filling or closing of cells

Abstract

An electrochromic display device comprises a display electrode, a counter electrode spaced from the display electrode, an electrolyte filled in the space between the display and counter electrodes, a first coloring layer formed on the display electrode and a second coloring layer laid on the first coloring layer. The first coloring layer is a crystalline layer containing electrochromic material and having a specific pattern. The second coloring layer is an amorphous layer containing electrochromic material.

Claims

1. An electrochromic display device comprising:

a display electrode;

a counter electrode spaced from the display electrode;

an electrolyte filled in the space between the display electrode and the counter electrode;

a first coloring crystalline layer formed on the display electrode, containing electrochromic material and having a specific pattern; and

a second coloring amorphous layer laid on the first coloring layer and containing electrochromic material.

2. A device according to claim 1, wherein said first coloring layer is formed of cermet.

3. A device according to claim 2, wherein said cermet layer is formed of at least one metal selected from the group consisting of gold and platinum, besides the electrochromic material.

4. A device according to claim 1, wherein said first coloring layer is obtained by heating an electrochromic layer formed by vacuum deposition.

5. A device according to claim 1, wherein said first coloring layer is formed by sputtering.

6. A device according to claim 1, wherein said second coloring layer is formed by vacuum deposition.

7. A device according to claim 1, wherein the electrochromic material forming said first and second coloring layers is tungsten oxide or molybdenum oxide.

8. A device according to claim 1, wherein said first coloring layer consists of tungsten oxide and has a density ranging from 7.0 to 7.5 g/cm³.

9. A device according to claim 1, wherein said second coloring layer consists of tungsten oxide and has a density ranging from 5.5 to 6.5 g/cm³.