US 11,815,746 B1
Method and apparatus for astigmatic correction in electronically tunable prescription glasses
Jim Weijian Li, Fremont, CA (US); Isabella T. Lewis, San Jose, CA (US); and Robert Arthur Sprague, Saratoga, CA (US)
Assigned to Amazon Technologies, Inc., Seattle, WA (US)
Filed by Amazon Technologies, Inc., Seattle, WA (US)
Filed on Sep. 30, 2021, as Appl. No. 17/490,441.
Int. Cl. G02C 7/06 (2006.01); G02F 1/1343 (2006.01); G02F 1/29 (2006.01); G02F 1/137 (2006.01)
CPC G02C 7/061 (2013.01) [G02F 1/137 (2013.01); G02F 1/134309 (2013.01); G02F 1/294 (2021.01)] 20 Claims
OG exemplary drawing
 
1. Astigmatism-corrected eyeglasses comprising:
a frame;
a plurality of lenses disposed in the frame, wherein each of the plurality of lenses comprises:
a first common electrode;
a first liquid crystal material;
a first circular, variable focus liquid crystal Fresnel lens disposed along an optical axis and comprising a first set of electrodes arranged in a first concentric pattern and in electrical communication with the first liquid crystal material and the first common electrode;
a second common electrode;
a second liquid crystal material;
a first cylindrical lens disposed along the optical axis and comprising a second set of electrodes aligned with a first vertical meridian of the first cylindrical lens and in electrical communication with the second liquid crystal material and the second common electrode;
a third common electrode;
a third liquid crystal material;
a second cylindrical lens disposed along the optical axis and comprising a third set of electrodes oriented at a first angle with respect to the first vertical meridian and in electrical communication with the third liquid crystal material and the third common electrode;
a second circular, variable focus liquid crystal Fresnel lens disposed along the optical axis and having a fourth set of electrodes arranged in a second concentric pattern;
a third cylindrical lens disposed along the optical axis and comprising a fifth set of electrodes aligned with a second vertical meridian of the third cylindrical lens; and
a fourth cylindrical lens disposed along the optical axis and having a sixth set of electrodes oriented at a second angle with respect to the second vertical meridian.