Electrochromic display device and compositions useful in making such devices
First Claim
1. A display device comprising at least two electrodes, and positioned between those two electrodes in such a manner to be visible a composition comprising:
- (a) a non-aqueous compound that undergoes a reversible electron transfer reaction with a subsequent change in its protic state resulting in a pH gradient in the device, (b) at least one indicator dye, and (c) a charge transport material.
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Accused Products
Abstract
The present invention relates to a composition and to a display device having the composition positioned between electrodes. The composition contains: (a) a compound that undergoes a reversible redox reaction to generate a pH gradient between the two electrodes, (b) an indicator dye, (c) a charge transport material, and optionally, (d) a matrix material and (e) an opacifier, and (f) secondary redox couple wherein components (a), (b), and (c) are different from one another and the standard reduction potential of component (a) is less than the standard reduction potential for the other components. Depending on the electric field present between the electrodes, a display image may be generated.
103 Citations
44 Claims
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1. A display device comprising at least two electrodes, and positioned between those two electrodes in such a manner to be visible a composition comprising:
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(a) a non-aqueous compound that undergoes a reversible electron transfer reaction with a subsequent change in its protic state resulting in a pH gradient in the device, (b) at least one indicator dye, and (c) a charge transport material.
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2. A display device comprising at least two electrodes, one being anodic and one being cathodic, and positioned between those two electrodes in such a manner to be visible a composition comprising:
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(a) a compound that undergoes a reversible electron transfer reaction with a subsequent change in its protic state resulting in a pH gradient in the device, (b) at least one indicator dye, and (c) a charge transport material wherein components (a), (b) and (c) are different from one another and component (a) preferentially undergoes the electron transfer reaction at the electrode surface. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A display device comprising at least two electrodes, one being anodic and one being cathodic, and positioned between those two electrodes in such a manner to be visible a composition comprising:
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(a) a compound that undergoes a reversible redox reaction to generate a pH gradient between the two electrodes, (b) at least one indicator dye, and (c) a charge transport material wherein components (a), (b) and (c) are different from one another and the standard reduction potential of component (a) is less than the standard reduction potential for the other components. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A composition comprising:
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(a) a compound that undergoes a electron transfer reaction with subsequent change in its protic state (b) at least one indicator dye which changes color when a change in pH occurs, and (c) an ionically conductive material and optionally component (d), a matrix material, wherein components (a), (b), (c) and (d) are different from one another and component (a) preferentially undergoes the electron transfer reaction when a charge is applied to the composition and provided that if (c) is a fluid the composition further comprises the matrix material (d). - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 39, 40, 41)
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31. A composition comprising:
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(a) a compound that undergoes a reversible redox reaction to generate a pH gradient, (b) at least one indicator dye, (c) a charge transport material, and (d) optionally, a matrix material wherein components (a), (b), (c) and (d) are different from one another, the standard reduction potential of component (a) is less than the standard reduction potential for the other components and provided that if (c) is a fluid the composition further comprises the matrix material (d). - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 42, 43, 44)
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Specification