Multilayer transformable device and display device comprising the same

Patent metadata

Field	Value
Publication number	US-2016187985-A1
Application number	US-201514971170-A
Country	US
Kind code	A1
Filing date	Dec 16, 2015
Priority date	Dec 31, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

Provided is a multilayer transformable device with enhanced driving displacement and a display device including the same. The multilayer transformable device, for example, includes a plurality of unit transformable devices, each of the unit transformable devices that includes a lower electrode, an upper electrode, and a transformable layer including an electro-active polymer (EAP) and a sub-transformable layer disposed between the plurality of unit transformable devices, the sub-transformable layer including a sub-EAP different from the EAP.

First claim

What is claimed is:

1 . A display device comprising:
a display panel; a multilayer transformable device on the display panel, the multilayer transformable device including:
at least two unit transformable devices, each of the at least two unit transformable devices including a first electrode, a second electrode, and a transformable layer between the first and second electrode, and
a sub-transformable layer between the at least two unit transformable devices,
wherein the transformable layer of each of the at least two unit transformable devices and the sub-transformable layer include an electro-active polymer, and wherein the electro-active polymer of the sub-transformable layer is different from the electro-active polymer of the transformable layer.

2 . The display device according to claim 1 , wherein the electro-active polymer of the transformable layer includes at least one of a dielectric elastomer and a ferroelectric polymer.

3 . The display device according to claim 1 , wherein the sub-transformable layer includes a dielectric elastomer as the electro-active polymer.

4 . The display device according to claim 1 , wherein the transformable layers of the at least two unit transformable devices include the same electro-active polymer.

5 . The display device according to claim 1 , wherein the electro-active polymer of the transformable layer includes a polyvinylidene fluoride (PVDF)-based polymer.

6 . The display device according to claim 1 , wherein the sub-transformable layer includes a high-dielectric filler.

7 . The display device according to claim 6 , wherein the high-dielectric filler includes one or more of piezoelectric ceramics, carbon nanoparticles, metal nanoparticles, a conductive polymer, barium titanate (BaTiO3) and PbZrO3-PbTiO3 (PZT).

8 . The display device according to claim 6 , wherein the sub-transformable layer includes a dielectric elastomer with a weight ratio of the dielectric elastomer to the high-dielectric filler being in a range of 99:1 to 50:50.

9 . The display device according to claim 1 , wherein the electro-active polymer of the sub-transformable layer includes polydimethyl siloxane.

10 . The display device according to claim 1 , wherein the sub-transformable layer is adhesively attaching the at least two unit transformable devices to each other.

11 . The display device according to claim 1 , wherein the sub-transformable layer has a thickness in a range of 1 to 300 μm.

12 . The display device according to claim 1 , wherein the sub-transformable layer and the transformable layers of the at least two unit transformable devices are configured to contract or expand in a same direction.

13 . The display device according to claim 1 , wherein the sub-transformable layer has a relative permittivity of 5 or more when measured at 1 kHz.

14 . The display device according to claim 1 , further comprising a touch panel that is on the display panel or included in the display device.

15 . The display device according to claim 1 , wherein the display panel includes a flexible substrate on which a plurality of pixels are formed.

16 . The display device according to claim 15 , wherein the display panel is an organic light emitting diode display panel in which each pixel includes a light emitting layer.

17 . A multilayer transformable device comprising:
at least two unit transformable devices, each of the at least two unit transformable devices including a first electrode, a second electrode, and a transformable layer between the first and second electrode, and a sub-transformable layer between the at least two unit transformable devices, wherein the transformable layer of each of the at least two unit transformable devices and the sub-transformable layer include an electro-active polymer, and wherein the electro-active polymer of the sub-transformable layer is different from the electro-active polymer of the transformable layer.

18 . The multilayer transformable device according to claim 17 , wherein the electro-active polymer of the transformable layer includes at least one of a dielectric elastomer and a ferroelectric polymer.

19 . The multilayer transformable device according to claim 17 , wherein the sub-transformable layer includes a high-dielectric filler that includes one or more of piezoelectric ceramics, carbon nanoparticles, metal nanoparticles, a conductive polymer, barium titanate (BaTiO3) and PbZrO3-PbTiO3 (PZT).

20 . The multilayer transformable device according to claim 19 , wherein the sub-transformable layer includes a dielectric elastomer with a weight ratio of the dielectric elastomer to the high-dielectric filler being in a range of 99:1 to 50:50.

Assignees

• Lg Display Co Ltd

Inventors

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

Classifications

• G06F2203/04102

  Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper · CPC title

• G06F3/016 Primary

  Input arrangements with force or tactile feedback as computer generated output to the user · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• H10N30/204

  using bending displacement, e.g. unimorph, bimorph or multimorph cantilever or membrane benders · CPC title

• H10N30/50 Primary

  having a stacked or multilayer structure · CPC title