Fail-safe electro-active lenses and methodology for choosing optical materials for fail-safe electro-active lenses

摘要

A fail-safe electro-active lens is presented in which the lens includes a substrate having a diffractive relief surface and an electro-active material in optical communication with the substrate. The electro-active material can include a nematic liquid crystal host. The refractive index of the substrate is equal to the average refractive index of the liquid crystal at a wavelength in the blue light spectrum.

主权项

1. A device comprising:
an electro-active lens comprising:
(a) a substrate having a diffractive relief surface; and(b) an electro-active material n optical communication with the substrate,wherein:
(i) the substrate has a refractive index that is a first function of wavelength,(ii) the electro-active material comprises a nematic liquid crystal host having an average refractive index that is a second function of wavelength different from the first function of wavelength,(iii) the electro-active lens has an activated state and a deactivated state,(iv) the refractive index and the average refractive index are equal at a crossover wavelength,(v) the crossover wavelength is in the blue light spectrum, and(vi) the electro-active lens has a first order diffraction efficiency in the deactivated state of less than 10% at the crossover wavelength and the electro-active lens has a first order diffraction efficiency in the activated state of greater than 90% at the crossover wavelength.