Display element and method of driving the same
AssigneeKonica Minolta Holdings, Inc.
InventorsNoriyuki Kokeguchi, Kaori Ono
Life of this patent
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Abstract
Provided is a novel electrochemical display element which performs bright white display, high contrast black/white display and full-color display with a simple member configuration. A method for driving such display element is also provided. The display element contains an electrochromic compound, which is colored or has its color disappear due to oxidation or reduction, a metallic salt compound, an electrolyte and a white scattered material, between opposing electrodes. The display element substantially performs multiple color display of three colors or more, i.e., black display, white display and colored display other than black, by driving operation of the opposing electrodes.
Claims17
A display element comprising:
- an electrochromic compound which is colored or decolored due to oxidation or reduction,
- a metallic salt compound,
- an electrolyte, and
- white scattering material incorporated between opposed electrodes, wherein
- the metallic salt compound causes a color variation by dissolution-deposition of a metal element;
- and
- multi-color display of substantially 3 or more colors comprising black display, white display and colored display other than black are carried out by a driving operation of the opposite electrodes, wherein a coloring overvoltage (VECW) and the decoloring overvoltage (VECE) of an electrochromic dye, and the deposition overvoltage (VAgW) and the dissolution overvoltage (VAgE) of silver of a silver salt compound satisfy all the conditions defined by following Relational expression (X):
- VECW absolute value>VECE absolute value
- VECW absolute value>VAgE absolute value
- VAgW absolute value>VECE absolute value
- VAgW absolute value>VAgE absolute value. Relational expression (X).
Dependencies are inferred from the claim text.