Electro-active diffractive lens and method for making the same
Aspects of the present invention provide an electro-active lens and method for manufacturing the same that encapsulates liquid crystal using solid transparent optical material using an improved liquid crystal seal feature. The seal feature greatly reduces the visibility of the liquid crystal seal feature in an assembled electro-active lens. The seal feature is also structurally robust such that the electro-active lens can be processed to fit a spectacle frame without disturbing containment of the liquid crystal and without disrupting electrical connectivity to the lens used to alter the refractive index of the liquid crystal, thereby ensuring fabrication of a commercially viable electro-active lens.
1. An electro-active lens, comprising:
(a) an electro-active element providing a first incremental add power; and
(b) a progressive addition optical power region providing a second incremental add power region, wherein the electro-active element and the progressive addition optical region are in optical communication and wherein the electro-active element transitions from an on-state to an off-state and;
wherein the clearing time of domain disclinations from the on-state to the off-state is less than approximately 250 milliseconds (ms).
2. The electro-active lens of claim 1 , wherein the off-state is substantially free of haze.
3. The electro-active lens of claim 1 , wherein the electro-active element provides a first optical power in the off-state and a second optical power in the on-state.
4. The electro-active lens of claim 1 , wherein the electro-active lens comprises:
electro-active material,
one or more transparent electrodes;
a substrate; and
one or more alignment layers.
5. The electro-active lens of claim 4 , wherein the substrate comprises a surface relief diffractive structure and an electro-active seal structure.
6. The electro-active lens of claim 5 , wherein a diffraction efficiency of the substrate in the off-state is approximately 0% and a diffraction efficiency of the substrate in the on-state is approximately 100%.
7. The electro-active lens of claim 4 , wherein the electro-active material is a cholesteric liquid crystal.
8. The electro-active lens of claim 1 , wherein the electro-active element transitions from the off-state to the on state; and
wherein the clearing time of domain disclinations from the off-state to the on-state is less than approximately 100 milliseconds (ms).
9. The electro-active lens of claim 1 , wherein the electro-active element comprises surface relief diffractive structures;
wherein the depth of the surface relief diffractive structures is less than or equal to 3.3 microns; and
wherein the electro-active element includes an electro-active material having a chiral dopant in a concentration less than 2.5 wt %.