Touch sensitive element and display device including the same

• US 10,459,549 B2
• Filed: 11/26/2017
• Issued: 10/29/2019
• Est. Priority Date: 11/29/2016
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kho, YuSeon, Lee, YongWoo, Ham, YongSu, Kim, TaeHeon, Ryu, KyungYeol, Lim, MyungJin, Choi, SeulGi
• Primary Examiner(s): Butcher, Brian M
• Application Number:
  US15/822,188
• Publication Number:
  US 20180150151A1
• Time in Patent Office: 702 Days
• Field of Search: None
• CPC Class Codes: C08L 33/22 Homopolymers or copolymers of nitriles containing four or more carbon atoms
• CPC Class Codes: C09D 127/16 Homopolymers or copolymers of vinylidene fluoride
• CPC Class Codes: G06F 3/016 Input arrangements with force or tactile feedback as computer generated output to the user
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: H10N 30/857 Macromolecular compositions

Abstract

The present disclosure related to a touch sensitive element and a display device including the same. The touch sensitive element according to an exemplary aspect of the present disclosure includes an electroactive film which is formed of a polyvinylidene fluoride (PVDF) based polymer and a cyanide (CN) based polymer.

Claims

1. A touch sensitive element, comprising:

an electroactive film which is formed of a polyvinylidene fluoride (PVDF) based polymer and a poly(methylvinylidene cyanide) (PMVC) represented by Chemical Formula 2,

2. The touch sensitive element according to claim 1, wherein the poly(methylvinylidene cyanide) (PMVC) has a permittivity higher than a permittivity of the PVDF based polymer.

3. The touch sensitive element according to claim 1, wherein the poly(methylvinylidene cyanide) has a RO group(alkoxy group) as a terminal group.

4. The touch sensitive element according to claim 1, wherein the poly(methylvinylidene cyanide) (PMVC) is an amount of 0.1 weight % to 2.2 weight % with respect to a total weight of a composition of the electroactive film.

5. The touch sensitive element according to claim 1, wherein the electroactive film has a vibration acceleration in a range of 0.82 G to 3.0 G at a voltage of 400 V.

6. The touch sensitive element according to claim 1, wherein the electroactive film has a light transmittance of 89.1% or higher.

7. The touch sensitive element according to claim 1, wherein the electroactive film has a permittivity in a range of 55.1 to 100 at a frequency of 100 Hz.

8. The touch sensitive element according to claim 1, wherein the PVDF based polymer includes one of PVDF, a PVDF based copolymer, and a PVDF based terpolymer.

9. The touch sensitive element according to claim 8, wherein the PVDF based terpolymer includes one of P(VDF-TrFE-CFE)(poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) and P(VDF-TrFE-CTFE)(poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene).

10. The touch sensitive element according to claim 1, further comprising:

a first electrode and a second electrode facing each other and having the electroactive film between the first and second electrodes, wherein at least one of the first electrode and the second electrode is an ITO electrode, and an adhesive strength of the ITO electrode of the electroactive film is in a range of 1.42 N to 3 N.

11. A display device, comprising:

a display panel;

a touch panel; and

a touch sensitive element including an electroactive film formed of a polyvinylidene fluoride (PVDF) based polymer and a poly(methylvinylidene cyanide) (PMVC) represented by Chemical Formula 2,

12. The display device according to claim 11, wherein the touch sensitive element has a light transmittance of 89.1% or higher, a permittivity of 55.1 to 100 at a frequency of 100 Hz, and a vibration acceleration of 0.82 G to 3.0 G at a voltage of 400 V.