Gradient-index liquid crystal lens having lens segments with optical power gradient

Patent metadata

Field	Value
Publication number	US-12066738-B2
Application number	US-202318460339-A
Country	US
Kind code	B2
Filing date	Sep 1, 2023
Priority date	Sep 1, 2022
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

A lens system may include a lens having a first electrode electrode layer, a second electrode layer, and a liquid crystal layer disposed between the first electrode layer and the second electrode layer. The lens may be divided into a plurality of lens segments that are concentrically arranged proceeding from a center to a radially outer periphery of the lens. An optical power of a first lens segment of the plurality of lens segments may be greater than an optical power of a second lens segment of the plurality of lens segments disposed radially outward relative to the first lens segment. Various other devices, systems, and methods are also disclosed.

First claim

What is claimed is:

1. A lens comprising;
a first electrode electrode layer;
a second electrode layer; and
a liquid crystal layer disposed between the first electrode layer and the second electrode layer;
wherein:
the lens is divided into a plurality of lens segments that are concentrically arranged proceeding from a center to a radially outer periphery of the lens; and
an optical power of a first lens segment of the plurality of lens segments is greater than an optical power of a second lens segment of the plurality of lens segments disposed radially outward relative to the first lens segment.

2. The lens system of claim 1 , further comprising a third lens segment of the plurality of lens segments that is disposed radially outward relative to the second lens segment, wherein the optical power of the third lens segment is less than the optical power of the second lens segment.

3. The lens system of claim 1 , further comprising:
a plurality of bus lines coupled to the first electrode layer; and
a controller that applies a different voltage to each of the plurality of bus lines.

4. The lens system of claim 1 , wherein:
the first electrode layer comprises a driving electrode array divided into a plurality of driving zones; and
each driving zone of the plurality of driving zones is positioned in a separate lens segment of the plurality of lens segments.

5. The lens system of claim 4 , wherein:
each driving zone of the plurality of driving zones comprises a plurality of driving electrodes consecutively arranged along a radial direction extending outward from the center; and
adjacent driving electrodes in a driving zone of the plurality of driving zones are coupled to each other by a resistor.

6. The lens system of claim 5 , wherein:
a plurality of bus lines is coupled to the driving electrode array; and
each bus line of the plurality of bus lines is electrically coupled to each driving zone of the plurality of driving zones.

7. The lens system of claim 6 , wherein each bus line of the plurality of bus lines is electrically coupled to a different driving electrode of the plurality of driving electrodes in each driving zone of the plurality of driving zones.

8. The lens system of claim 5 , wherein a resistor coupling two adjacent driving electrodes is configured to maintain a voltage difference between the two adjacent driving electrodes during operation.

9. The lens system of claim 5 , wherein the plurality of driving electrodes in a driving zone each overlap an area having approximately the same size.

10. The lens system of claim 4 , wherein each driving zone is electrically separated from other driving zones of the plurality of driving zones.

11. The lens system of claim 4 , wherein adjacent driving electrodes are separated from each other by a gap region extending between the adjacent driving electrodes.

12. The lens system of claim 1 , wherein each of the plurality of lens segments extends along an arcuate path.

13. A lens comprising;
a first electrode electrode layer comprising a driving electrode array divided into a plurality of driving zones;
a second electrode layer; and
a liquid crystal layer disposed between the first electrode layer and the second electrode layer;
wherein:
the plurality of driving zones of the driving electrode array are concentrically arranged proceeding from a center to a radially outer periphery of the lens; and
the plurality of driving zones are each configured to produce a different optical power in a corresponding lens segment of a plurality of lens segments of the lens when voltages are applied by the first electrode layer to the liquid crystal layer.

14. The lens system of claim 13 , wherein:
each driving zone of the plurality of driving zones comprises a plurality of driving electrodes consecutively arranged along a radial direction extending outward from the center; and
a plurality of bus lines is coupled to the driving electrode array.

15. The lens system of claim 14 , wherein each bus line of the plurality of bus lines is electrically coupled to each driving zone of the plurality of driving zones.

16. The lens system of claim 14 , wherein each bus line of the plurality of bus lines is electrically coupled to a different driving electrode of the plurality of driving electrodes in each driving zone of the plurality of driving zones.

17. The lens system of claim 14 , wherein:
adjacent driving electrodes in a driving zone of the plurality of driving zones are coupled to each other by a resistor; and
a resistor coupling two adjacent driving electrodes is configured to maintain a voltage difference between the two adjacent driving electrodes during operation.

18. The lens system of claim 13 , wherein each of the plurality of driving zones extends along an arcuate path.

19. A method comprising:
applying a first set of voltages via a plurality of bus lines to a plurality of driving zones of a driving electrode array of a lens, wherein:
the plurality of driving zones of the driving electrode array are concentrically arranged proceeding from a center to a radially outer periphery of the lens;
the lens comprises a liquid crystal layer disposed between the driving electrode array and a second electrode layer; and
the plurality of driving zones are each configured to produce a different optical power in a corresponding lens segment of a plurality of lens segments of the lens when the first set of voltages are applied by the first electrode layer to the liquid crystal layer; and

applying a second set of voltages via the plurality of bus lines to the plurality of driving zones of the driving electrode array of the lens.

20. The method of claim 19 , wherein:
the plurality of driving zones are each configured to produce a different optical power in the corresponding lens segment of the plurality of lens segments of the lens when the second set of voltages are applied by the first electrode layer to the liquid crystal layer; and
the optical powers produced in the plurality of lens segments in response to the first set of voltages is different than the optical powers produced in response to the second set of voltages.

Assignees

• Meta Platforms Tech Llc

Inventors

• Bhowmick Amit
• Jamali Afsoon

Classifications

• G02F1/294

  Variable focal length devices · CPC title

• G02F1/29 Primary

  for the control of the position or the direction of light beams, i.e. deflection · CPC title