Electrochromic indicating device
AssigneeBayer Aktiengesellschaft
InventorsHorst Berneth, Uwe Claussen, Dietrich Haarer, Jochen Schaller
Life of this patent
Estimating the term…
Abstract
Electrochromic display devices, whose plates having conductive coatings are subdivided into segments which are electrically separated from one another, can be contacted individually and, between the plates, contain a solvent, specific electrochromic substances and optionally conductive salts, are distinguished by excellent edge definition and high contrast.
Claims15
An electrochromic display device comprising at least two transparent substrates which are joined to one another via a spacer ring and of which at least one has an electrically conductive, transparent coating on the side facing the other and one of the substrates may be mirrored, wherein at least one of the substrates having a conductive coating is subdivided into segments which are electrically separated from one another and can be contacted singly, and there is contained, between the substrates,
- a) a solvent,
- b) dissolved in this solvent at least one oxidizable substance RED1 which, by releasing electrons at an anode, is converted into its respective form OX1 with a change in absorbance in the visible region of the spectrum, and at least one reducible substance OX2 which by accepting electrons at a cathode, is converted into its respective form RED2 with a change in absorbance in the visible region of the spectrum, the original forms RED1 and OX2 each being recovered after charge equalization,
- c) optionally a conductive salt.
Dependencies are inferred from the claim text.