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US 4,304,465 AGranted
Electrochromic display device
AssigneeInternational Business Machines Corporation
InventorArthur F. Diaz
Life of this patent
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Abstract
An electrochromic display device has a polymer film on the display electrode. In the writing step the polymer film on the display electrode is oxidized to a colored, non-transparent form. In the erasing step the polymer film is reduced to a neutral transparent form. A film of polyaniline is used in a preferred embodiment. A film of polypyrrole is used in another embodiment.
Claims9
An electrochromic display device comprising
- a hollow panel enclosing an electrolyte and having a first transparent face and a second face,
- a counter electrode located on the inner surface of said transparent face,
- a display electrode on the inner surface of said second face, and
- a polymer film of a polypyrrole on said display electrode wherein varying the potential of said display electrode causes said polymer film to change in color and transparency.
1 more element
An electrochromic display device comprising
- a hollow panel enclosing an electrolyte and having a first transparent face and a second face,
- a counter electrode located on the inner surface of said transparent face,
- a display electrode on the inner surface of said second face, and
- a polymer film selected from the group consisting of polyaniline and polynaphthylamines on said display electrode wherein varying the potential of said display electrode causes said polymer film to change in color and transparency.
1 more element
An electrochromic display device comprising
- a hollow panel enclosing an electrolyte and having a first transparent face and a second face,
- a counter electrode located on the inner surface of said transparent face,
- a display electrode on the inner surface of said second face, and
- a polymer film of N-phenyl polypyrrole on said display electrode wherein varying the potential of said display electrode causes said polymer film to change in color and transparency.
1 more element
An electrochromic display device comprising
- a hollow panel enclosing an electrolyte and having a first transparent face and a second face,
- a counter electrode located on the inner surface of said transparent face,
- a display electrode on the inner surface of said second face, and
- a polymer film of N-methyl polypyrrole on said display electrode wherein varying the potential of said display electrode causes said polymer film to change in color and transparency.
1 more element
Dependencies are inferred from the claim text.