Tactile feedback device

Patent metadata

Field	Value
Publication number	US-2018129286-A1
Application number	US-201715788902-A
Country	US
Kind code	A1
Filing date	Oct 20, 2017
Priority date	Nov 8, 2016
Publication date	May 10, 2018
Grant date	—

Abstract

There is provided a tactile feedback device comprising: an array of surface charge generation units; and an array of pressure-generation units, wherein the array of the pressure-generation units is spaced apart from the array of the surface charge generation units, wherein the array of the pressure-generation units is movable relative to the array of the surface charge generation units, wherein an attractive or repulsive force is generated between a corresponding surface charge generation unit of the array of surface charge generation units and a corresponding pressure-generation unit of the array of the pressure-generation units, based on a polarity of surface charges induced in the corresponding surface charge generation unit.

First claim

What is claimed is:

1 . A tactile feedback device comprising:
an array of surface charge generation units; and an array of pressure-generation units, wherein the array of the pressure-generation units is spaced apart from the array of the surface charge generation units, wherein the array of the pressure-generation units is movable relative to the array of the surface charge generation units, wherein an attractive or repulsive force is generated between a corresponding surface charge generation unit of the array of surface charge generation units and a corresponding pressure-generation unit of the array of the pressure-generation units, based on a polarity of surface charges induced in the corresponding surface charge generation unit, and wherein the attractive force allows spacing between the corresponding surface charge generation unit and the pressure-generation unit to be decreased while the repulsive force allows spacing between the corresponding surface charge generation unit and the pressure-generation unit to be increased.

2 . The device of claim 1 , wherein a combination of the corresponding surface charge generation unit and the pressure-generation unit defines a corresponding pixel of the device.

3 . The device of claim 2 , wherein the surface charge generation unit in each pixel includes:
a substrate; a gate electrode disposed on a portion of the substrate; an oxide layer covering the gate electrode to insulate the gate electrode; a first charge trapping layer disposed within the oxide layer; a channel layer disposed on the oxide layer; and a source electrode and a drain electrode respectively disposed at both longitudinal ends of the channel layer.

4 . The device of claim 2 , wherein the oxide layer is defined into a tunneling oxide layer and a gate oxide layer.

5 . The device of claim 4 , wherein the tunneling oxide layer is disposed between the channel layer and the first charge trapping layer, wherein the gate oxide layer is disposed between the gate electrode and the first charge trapping layer.

6 . The device of claim 3 , wherein the channel layer is made of a two-dimensional material.

7 . The device of claim 6 , wherein the two-dimensional material includes a material having a low carrier concentration and minimizing electric field shielding.

8 . The device of claim 7 , wherein the material having a low carrier concentration and minimizing electric field shielding includes at least one of MoS 2 , WSe 2 , MoTe 2 , and WS 2 .

9 . The device of claim 1 , wherein the pressure-generation unit comprises:
a second charge trapping layer, and a pressure-transfer protrusion disposed on the second charge trapping layer.

10 . The device of claim 9 , wherein the second charge trapping layer include an electret.

11 . The device of claim 9 , wherein the second charge trapping layer is made of a material capable of receiving high-density charges and capable of semi-permanently retaining the received charges therein.

12 . The device of claim 11 , wherein the material capable of receiving high-density charges and capable of semi-permanently retaining the received charges therein includes at least one of CYTOP, TEFLON AF, and Parylene.

13 . The device of claim 3 , wherein the first charge trapping layer is made of a material capable of receiving high-density charges and capable of controlling surface charges.

14 . The device of claim 13 , wherein the material capable of receiving high-density charges and capable of controlling surface charges includes at least one of CYTOP, TEFLON AF, and Parylene.

15 . The device of claim 9 , wherein the pressure-transfer protrusion includes a lightweight material having excellent compatibility with human skin.

16 . The device of claim 15 , wherein the lightweight material having excellent compatibility with human skin includes at least one of P(VDF-TrFE), PFA, TEFLON, KAPTON, and PDMS.

17 . The device of claim 9 , wherein the pressure-transfer protrusion is supported by a pressure-transfer protrusion support, wherein the pressure-transfer protrusion movably passes through the support, wherein an upper portion of the pressure-transfer protrusion is held by the support, and a lower portion of the pressure-transfer protrusion is disposed under the support and is coupled to the second charge trapping layer.

Assignees

• Research & Business Found Sungkyunkwan Univ

Inventors

• Kim Sang Woo
• Seung Wan Chul
• Yoon Hong Joon
• Kwak Sung Soo
• Kim Dong Hoon
• Kim Tae Yun
• Kang Min Ki
• Lee Kang Hyuck
• Kim Sung Kyun
• Lee Jeong Hwan
• Kim Seong Su

Classifications

• H02N1/002

  Electrostatic motors · CPC title

• G06F3/016 Primary

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

• G06F3/011

  Arrangements for interaction with the human body, e.g. for user immersion in virtual reality (blind teaching G09B21/00) · CPC title

• G09B21/004

  Details of particular tactile cells, e.g. electro-mechanical or mechanical layout · CPC title

• H10N30/50

  having a stacked or multilayer structure · CPC title