Contact sensitive device, display apparatus including the same and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-10877590-B2
Application number	US-201916396212-A
Country	US
Kind code	B2
Filing date	Apr 26, 2019
Priority date	Dec 31, 2015
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

Provided are a contact sensitive device, a display apparatus including the same, and a method of manufacturing the same. The contact sensitive device includes an electroactive layer formed of an electroactive polymer having a plurality of nano pores and an electrode disposed on at least one surface of the electroactive layer. The electroactive layer has a β-phase structure and improved piezoelectricity without performing a stretching process or a polling process.

First claim

What is claimed is:

1. A method of manufacturing a contact sensitive device, the method comprising:
forming a block copolymer comprising an electroactive polymer and an amorphous polymer;
forming a lamellar film from the block copolymer;
forming an electroactive layer including a plurality of nano pores by etching the lamellar film to remove the amorphous polymer; and
filling the plurality of nano pores with a refractive index matching material.

2. The method according to claim 1 , wherein the block copolymer includes the electroactive polymer and the amorphous polymer at a volume fraction of 4:6 to 7:3.

3. The method according to claim 1 , wherein the electroactive polymer is a PVDF-based polymer.

4. The method according to claim 1 , wherein the amorphous polymer is polystyrene.

5. The method according to claim 1 , wherein a refractive index of the refractive index matching material is 1.2 to 1.6.

6. The method according to claim 1 , wherein a porosity of the electroactive layer is 30% to 60%, and a density of the electroactive layer is 800 kg/cm 3 to 1400 kg/m 3 .

7. The method according to claim 1 , wherein the electroactive polymer is a ferroelectric polymer.

8. The method according to claim 1 , wherein the plurality of nano pores are arranged in a planar direction with respect to the electroactive layer.

9. The method according to claim 1 , wherein a pore diameter in the planar direction is larger than a pore diameter in a thickness direction of each of the plurality of nano pores.

10. The method according to claim 1 , wherein the electroactive polymer is nanocrystalline and has a β-phase structure.

11. A method of manufacturing a display apparatus, the method comprising:
forming a touch sensitive device on or below a display panel, wherein the forming a touch sensitive device comprises:
forming a lamellar film from a block copolymer comprising an electroactive polymer and an amorphous polymer;
forming an electroactive layer including a plurality of nano pores by etching the lamellar film to remove the amorphous polymer; and
filling the plurality of nano pores with a refractive index matching material.

12. The method according to claim 11 , wherein the electroactive layer including a PVDF-based polymer and an amorphous polymer, and the PVDF-based polymer and the amorphous polymer are alternately laminated.

13. The method according to claim 11 , wherein the plurality of nano pores are surrounded by the electroactive polymer.

14. The method according to claim 11 , wherein the forming the touch sensitive device further comprising:
forming a first electrode on a surface the electroactive layer and a second electrode on electroactive layer,
wherein the first electrode overlaps the second electrode and forms a tactile cell.

15. The method according to claim 14 , wherein the tactile cell is configured to vibrate by applying a voltage to the first and second electrodes or the tactile cell provides tactile feedback to a user.

16. The method according to claim 11 , further comprising:
forming a touch panel on the display panel,
wherein the touch sensitive device is between the touch panel and the display panel, or the touch sensitive device is below the display panel.

17. The method according to claim 16 , wherein the touch sensitive device is configured for providing tactile feedback to a user is between the touch panel and the display panel, or below the display panel.

18. The method according to claim 11 , wherein a refractive index of the refractive index matching material is 1.2 to 1.6.

Assignees

• Lg Display Co Ltd

Inventors

• Choi Seulgi
• Ham Yong-Su
• Kim Taeheon
• Lee Yongwoo
• Kho Yuseon
• Lim Myungjin

Classifications

• C08J2353/00

  Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers · CPC title

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• C08J2201/0464

  using water or inorganic fluids · CPC title