Solid state electrochromic display

• US 4,306,774 A
• Filed: 07/19/1979
• Issued: 12/22/1981
• Est. Priority Date: 10/04/1978
• Status: Expired due to Term

• Current Assignee: Rockwell International Corporation
• Original Assignee: Rockwell International Corporation
• Inventors: Nicholson, Margie W.
• Primary Examiner(s): Gron, Teddy S.
• Application Number:
  US06/058,995
• Time in Patent Office: 887 Days
• Field of Search: 350/357, 252/408, 252/600, 252/518, 252/521
• US Class Current: 359/270
• CPC Class Codes: G02F 1/1516 comprising organic material
• CPC Class Codes: G02F 1/1525 characterised by a particular ion transporting layer, e.g. electrolyte
• CPC Class Codes: G02F 1/1533 structural features not otherwise provided for
• CPC Class Codes: G02F 1/155 Electrodes

Abstract

This invention is directed to a multicolored display which is based upon the rare-earth dipthalocyanines, and having a protonconductive, solid electrolyte which is selected for the electrochemical compatibility thereof with the electrochromic material in the display. Typically, the solid electrolyte consists of hydrogen uranyl phosphate or a related heteropoly acid.

Claims

1. An electrochromic display cell comprising:

a pair of enclosure plates, at least one of which is transparent;

a counter electrode and

a display electrode disposed between said enclosure plates;

a layer of electrochromic material disposed on said display electrode, said layer of electrochromic material being selected from the group consisting of a diphthalocyanine of a rare-earth element, yttrium, and scandium; and

a solid electrolyte material disposed between said counter electrode and said display electrode, said electrolyte material being selected from the group consisting of a heteropoly acid, and hydrogen uranyl phosphate (HUO₂ PO_r.4H₂ O).

2. The display cell recited in claim 1 including:

power supply means connected between said counter electrode and said display electrode.