Optically transparent polymeric actuator and display apparatus employing same

Patent metadata

Field	Value
Publication number	US-11739268-B2
Application number	US-202217811619-A
Country	US
Kind code	B2
Filing date	Jul 11, 2022
Priority date	Jun 10, 2016
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

An optically transparent actuator apparatus is provided that includes an optically transparent bi-stable member including an optically transparent liquid crystalline polymer layer. The bi-stable member is structured to move from a first state to a second state in response to a first stimulus and from the second state to the first state in response to a second stimulus. Also, a display apparatus includes a plate member and an actuator assembly coupled to the plate member. The actuator assembly includes a number of optically transparent liquid crystalline polymer layers, wherein each of the optically transparent liquid crystalline polymer layers is structured to move from a first state to a second state in response to a first stimulus.

First claim

What is claimed is:

1. A method of making an optically transparent actuator element, comprising:
forming a structure including:
(i) forming an optically transparent liquid crystalline polymer layer, and
(ii) forming a first optically transparent conductor member on a first surface of the optically transparent liquid crystalline polymer layer and a second optically transparent conductor member on a second surface of the optically transparent liquid crystalline polymer layer opposite the first surface; and

applying a number of displacement forces to one or more ends of the structure to cause the structure to buckle and provide an arch-shaped portion in the structure.

2. The method according to claim 1 , wherein the liquid crystalline polymer layer comprises a number of twisted nematic liquid crystalline polymer films.

3. The method according to claim 2 , wherein the liquid crystalline polymer layer comprises a pair of cross-linked twisted nematic liquid crystalline polymer films.

4. The method according to claim 1 , wherein the liquid crystalline polymer layer comprises a number of splayed liquid crystalline polymer films.

5. The method according to claim 4 , wherein the liquid crystalline polymer layer comprises a pair of cross-linked splayed liquid crystalline polymer films.

6. The method according to claim 1 , wherein the optically transparent liquid crystalline polymer layer comprises a sandwich structure including a first liquid crystalline polymer film strip adhered to a second liquid crystalline polymer film strip.

7. The method according to claim 6 , wherein the first liquid crystalline polymer film strip and the second liquid crystalline polymer film strip are each formed from a mixture including an acrylate-functionalized mesogen, a chiral dopant and Irgacure 784.

8. The method according to claim 7 , wherein the first liquid crystalline polymer film strip and the second liquid crystalline polymer film strip are formed by capillary filling the mixture in a number of patterned glass cells to create a sheet of material and then excising the first liquid crystalline polymer film strip and the second liquid crystalline polymer film strip from the sheet of material.

9. The method according to claim 1 , wherein the optically transparent liquid crystalline polymer layer is formed by mixing an acrylate-functionalized mesogen with a chiral dopant and Irgacure 784.

10. The method according to claim 1 , wherein the first optically transparent conductor member and the second member optically transparent conductor member are formed by RF magnetron sputtering.

11. The method according to claim 1 , wherein the first optically transparent conductor member and the second member optically transparent conductor member are formed by e-beam deposition.

12. The method according to claim 1 , wherein the first optically transparent conductor member and the second member optically transparent conductor member are formed by atomic layer deposition.

13. The method according to claim 1 , wherein the first optically transparent conductor member and the second member optically transparent conductor member are formed by transfer printing.

14. The method according to claim 1 , wherein the first optically transparent conductor member and the second member optically transparent conductor member are made from indium tin oxide.

15. The method according to claim 1 , wherein the first optically transparent conductor member and the second member optically transparent conductor member are made from graphene.

16. The method according to claim 1 , wherein the first optically transparent conductor member and the second member optically transparent conductor member are made from carbon nanotube (CNT) conductors.

17. The method according to claim 1 , wherein the first optically transparent conductor member and the second member optically transparent conductor member are made from a number of nanowire arrays.

18. The method according to claim 1 , wherein the first optically transparent conductor member and the second member optically transparent conductor member are made from a number of nanomesh structures.

19. The method according to claim 1 , wherein the liquid crystalline polymer layer comprises a first side wherein the molecules in the first side are aligned in a first manner, and a second side wherein the molecules in the second side are aligned in a second manner that is orthogonal to the first manner.

20. The method according to claim 19 , wherein first side is a first planar aligned side wherein the molecules in the first planar aligned side are aligned in a first planar manner, and wherein the second side is a second planar aligned side wherein the molecules in the second planar aligned side are aligned in a second planar manner that is orthogonal to the first planar manner.

21. The method according to claim 20 , wherein the molecules in the first planar aligned side are aligned along a first axis of the optically transparent bi-stable member and the molecules in the second planar aligned side are aligned along a second axis of the optically transparent bi-stable member that is orthogonal to the first axis.

22. The method according to claim 21 , wherein the optically transparent bi-stable member has a first length along the first axis and a second length along the second axis, the second length being longer than the first length.

23. The method according to claim 19 , wherein the first side is a first planar aligned side wherein the molecules in the first planar aligned side are aligned in a first planar manner, and wherein the molecules in the second side are aligned homeotropically.

Assignees

• Univ Pittsburgh Commonwealth Sys Higher Education

Inventors

• Meenakshisundaram Ravi Shankar

Classifications

• F03G7/0614

  using shape memory elements · CPC title

• C09K19/38 Primary

  Polymers · CPC title

• A61B17/32

  Surgical cutting instruments ({A61B18/042 takes precedence; suture cutters A61B17/0467;} implements for ligaturing and cutting {A61B17/122, A61B17/12; instruments for rupturing the amniotic membrane A61B17/4208; specially adapted knives for eye surgery A61F9/0133}) · CPC title

• A61B17/34

  Trocars; Puncturing needles · CPC title

• A61B17/3423

  Access ports, e.g. toroid shape introducers for instruments or hands (access sites for liquids A61M39/0247) · CPC title