Cosmetic article including an electrochromic multilayer structure

1. A cosmetic device for applying to human keratinous materials, the device including an electrochromic multilayer structure comprising an electrosensitive stack formed by at least:

first and second electrode layers, the first and second electrode layers being coatings supported by respective support layers, said support layers being constituted by a single flexible film or an assembly of flexible films;

first and second active electrochromic layers; and

an electrolyte layer; and further including:

an optically-active layer that is superposed, at least in part, on the electrosensitive stack,

wherein the optically-active layer is at least one of a layer including an effect pigment, a colored layer, a luminescent layer and printing.

2. The device according to claim 1 , the optically-active layer being situated on top of the electrosensitive stack.

3. The device according to claim 1 , the optically-active layer being situated between two layers of the electrosensitive stack.

4. The device according to claim 1 , the optically-active layer being situated beneath the electrosensitive stack.

5. The device according to claim 1 , the optically-active layer being colored.

6. The device according to claim 3 , the optically-active layer being luminescent and the electrosensitive stack being capable, as a function of its electrical excitation, of blocking, at least partially, at least one optical-excitation wavelength of the optically-active layer.

7. The device according to claim 3 , the optically-active layer being photochromic and the electrosensitive stack being capable, as a function of its electrical excitation, of blocking, at least partially, at least one optical-excitation wavelength of the optically-active layer.

8. The device according to claim 1 , the optically-active layer extending over the entire extent of the electrosensitive stack.

9. The device according to claim 1 , the optically-active layer being discontinuous.

10. The device according to claim 2 , the optically-active layer including an interference pigment, a liquid crystal, or an interference pigment and a liquid crystal.

11. The device according to claim 10 , the interference pigment comprising a goniochromatic or diffractive pigment.

12. The device according to claim 11 , the electrosensitive stack being capable of filtering a color of a color path of the goniochromatic or diffractive pigment.

13. The device according to claim 1 , said device being configured to be fastened to a nail.

14. A method of applying makeup to human keratinous materials, wherein the device as defined in claim 1 is fastened to said human keratinous materials.

15. A cosmetic device for applying to human keratinous materials, the device including an electrochromic multilayer structure comprising an electrosensitive stack formed by at least:

first and second electrode layers;

first and second active electrochromic layers; and

an electrolyte layer; and further including:

an optically-active layer that is superposed, at least in part, on the electrosensitive stack,

wherein the optically-active layer is situated between two layers of the electrosensitive stack, and

wherein the optically-active layer is luminescent and the electrosensitive stack is capable, as a function of its electrical excitation, of blocking, at least partially, at least one optical-excitation wavelength of the optically-active layer.

16. A cosmetic device for applying to human keratinous materials, the device including an electrochromic multilayer structure comprising an electrosensitive stack formed by at least:

first and second electrode layers;

first and second active electrochromic layers; and

an electrolyte layer; and further including:

an optically-active layer that is superposed, at least in part, on the electrosensitive stack,

wherein the optically-active layer is situated between two layers of the electrosensitive stack, and

wherein the optically-active layer is photochromic and the electrosensitive stack is capable, as a function of its electrical excitation, of blocking, at least partially, at least one optical-excitation wavelength of the optically-active layer.

17. A cosmetic device for applying to human keratinous materials, the device including an electrochromic multilayer structure comprising an electrosensitive stack formed by at least:

first and second electrode layers;

first and second active electrochromic layers; and

an electrolyte layer; and further including:

an optically-active layer that is superposed, at least in part, on the electrosensitive stack,

wherein the optically-active layer is discontinuous.

18. A cosmetic device for applying to human keratinous materials, the device including an electrochromic multilayer structure comprising an electrosensitive stack formed by at least:

first and second electrode layers;

first and second active electrochromic layers; and

an electrolyte layer; and further including:

an optically-active layer that is superposed, at least in part, on the electrosensitive stack,

wherein the optically-active layer is situated on top of the electrosensitive stack, and

wherein the optically-active layer includes an interference pigment, a liquid crystal, or an interference pigment and a liquid crystal.

19. A cosmetic device for applying to human keratinous materials, the device including an electrochromic multilayer structure comprising an electrosensitive stack formed by at least:

first and second electrode layers;

first and second active electrochromic layers; and

an electrolyte layer; and further including:

an optically-active layer that is superposed, at least in part, on the electrosensitive stack,

wherein the optically-active layer is situated on top of the electrosensitive stack,

wherein the optically-active layer includes an interference pigment, a liquid crystal, or an interference pigment and a liquid crystal, and

wherein the interference pigment comprises a goniochromatic or diffractive pigment.

20. A cosmetic device for applying to human keratinous materials, the device including an electrochromic multilayer structure comprising an electrosensitive stack formed by at least:

first and second electrode layers;

first and second active electrochromic layers; and

an electrolyte layer; and further including:

an optically-active layer that is superposed, at least in part, on the electrosensitive stack,

wherein the optically-active layer is situated on top of the electrosensitive stack,

wherein the optically-active layer includes an interference pigment, a liquid crystal, or an interference pigment and a liquid crystal,

wherein the interference pigment comprises a goniochromatic or diffractive pigment, and wherein the electrosensitive stack is capable of filtering a color of a color path of the goniochromatic or diffractive pigment.

21. A cosmetic device including an electrochromic multilayer structure comprising an electrosensitive stack formed by at least:

first and second electrode layers, the first and second electrode layers being coatings supported by respective support layers, said support layers being constituted by a single flexible film or an assembly of flexible films;

first and second active electrochromic layers; and

an electrolyte layer;

wherein an optically-active layer made of makeup is superposed, at least in part, on the electrosensitive stack.