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Aveso’s proprietary
display technology is based on novel approach to electrochromics,
invented by scientists at The Dow Chemical Company. Electrochromism
is the term given to a color change in a material caused by the passage
of an electric current potential. Traditional electrochromic materials
rely on a “redox dye” that must serve as both the redox
material and the color-changing agent, resulting in an unsatisfactory
tradeoff between contrast, lifetime (number of cycles), and available
color sets.
In contrast to traditional electrochromic systems, the Aveso system
separates the function of the redox material from the dye. The Aveso
system is based on the following electrochemical-chemical principles:
(1) a reversible oxidation-reduction (redox) material is used to create
a pH gradient; (2) a pH sensitive dye responds to the change in pH,
resulting in the formation of a high contrast, reflective image.
By separating the function of the redox material and the dye, Aveso
inks provide a novel family of high contrast materials that are inherently
stable, processable, and versatile. Further, by requiring only one
redox couple for producing the pH change, color selection flexibility
and long life are achieved compared to systems that require a new
redox couple for each color.
Global patents protect the enabling electro-active ink technology
at the core of Aveso, as well as construction and design for printed,
passive matrix displays and other device architectures for updateable
applications.
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