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

Patent metadata

Field	Value
Publication number	US-2017192595-A1
Application number	US-201615394395-A
Country	US
Kind code	A1
Filing date	Dec 29, 2016
Priority date	Dec 31, 2015
Publication date	Jul 6, 2017
Grant date	—

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 contact sensitive device, comprising:
an electroactive layer comprising an electroactive polymer having a plurality of nano pores; and an electrode disposed on at least one surface of the electroactive layer.

2 . The contact sensitive device according to claim 1 , wherein the electroactive polymer is a ferroelectric polymer.

3 . The contact sensitive device according to claim 2 , wherein the electroactive polymer is a polyvinylidenefluoride (PVDF)-based polymer.

4 . The contact sensitive device according to claim 1 , wherein the plurality of nano pores are arranged in a planar direction with respect to the electroactive layer.

5 . The contact sensitive device 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.

6 . The contact sensitive device according to claim 1 , wherein a porosity of the electroactive layer is 30% to 60%.

7 . The contact sensitive device according to claim 1 , wherein a density of the electroactive layer is 800 kg/cm 3 to 1400 kg/m 3 .

8 . The contact sensitive device according to claim 1 , wherein the electroactive polymer is nanocrystalline and has a β-phase structure.

9 . The contact sensitive device according to claim 1 , further comprising:
a refractive index matching material, wherein the refractive index matching material is present in the plurality of nano pores.

10 . The contact sensitive device according to claim 9 , wherein a refractive index of the refractive index matching material is 1.2 to 1.6.

11 . The contact sensitive device according to claim 9 , wherein the refractive index matching material is one or more selected from the group consisting of polyvinylidenefluoride-trifluoroethylene-chlorotrifluoroethylene (P(VDF-TrFE-CTFE)), polyvinylidenefluoride-trifluoroethylene-chlorofluoroethylene (P(VDF-TrFE-CFE)), polyvinylidenefluoride-trifluoroethylene-hexafluoropropene (P(VDF-TrFE-HFP)), polyvinylidenefluoride-trifluoroethylene-chlorodifluoroethylene (P(VDF-TrFE-CDFE)), polyvinylidenefluoride-tetrafluoroethylene-chlorotrifluoroethylene (P(VDF-TFE-CTFE)), polyvinylidenefluoride-tetrafluoroethylene-chlorofluoroethylene (P(VDF-TFE-CFE)), polyvinylidenefluoride-tetrafluoroethylene-hexafluoropropene (P(VDF-TFE-HFP)), and polyvinylidenefluoride-trifluoroethylene-chlorodifluoroethylene (P(VDF-TFE-CDFE)).

12 . A display apparatus, comprising:
a display panel; and a contact sensitive device, wherein the contact sensitive device includes an electroactive layer comprising an electroactive polymer having a plurality of nano pores and an electrode disposed on at least one surface of the electroactive layer.

13 . The display apparatus according to claim 12 , further comprising:
a touch panel on the display panel, wherein the contact sensitive device is disposed between the display panel and the touch panel.

14 . 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; and forming an electroactive layer including a plurality of nano pores by etching the lamellar film to remove the amorphous polymer.

15 . The method according to claim 14 , wherein the block copolymer includes the electroactive polymer and the amorphous polymer at a volume fraction of 4 : 6 to 7 : 3.

16 . The method according to claim 14 , wherein the electroactive polymer is a PVDF-based polymer.

17 . The method according to claim 14 , wherein the amorphous polymer is polystyrene.

18 . The method according to claim 14 , further comprising:
filling the plurality of nano pores with a refractive index matching material.

19 . The method according to claim 14 , wherein a refractive index of the refractive index matching material is 1.2 to 1.6.

20 . The method according to claim 14 , 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 .

Assignees

• Lg Display Co Ltd

Inventors

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

Classifications

• C08J9/26

  by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out · CPC title

• C08J2201/0464

  using water or inorganic fluids · CPC title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/041

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

• 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