Electrochromic display device and compositions useful in...

G - Physics – 02 – F

Patent

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G02F 1/15 (2006.01) G02F 1/155 (2006.01) G02F 1/17 (2006.01)

Patent

CA 2441266

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.

La présente invention concerne une composition et un dispositif d'affichage dans lequel la composition est placée entre des électrodes. La composition contient: (a) un composé soumis à une réaction d'oxydoréduction réversible pour produire un gradient de pH entre les deux électrodes, (b) un colorant indicateur, (c) un matériau porteur de charge, et éventuellement, (d) un matériau de base et (e) un opacifiant, et (f) un couple de réaction d'oxydoréduction secondaire dans lequel les constituants (a), (b), et (c) sont différents les uns des autres et le potentiel de réduction standard du constituant (a) est inférieur au potentiel de réduction standard pour les autres constituants. En fonction du champ électrique entre les électrodes, une image peut être générée.

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