KR20150012400A - Tunable material property based tactile display modual - Google Patents

Tunable material property based tactile display modual Download PDF

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Publication number
KR20150012400A
KR20150012400A KR1020130087866A KR20130087866A KR20150012400A KR 20150012400 A KR20150012400 A KR 20150012400A KR 1020130087866 A KR1020130087866 A KR 1020130087866A KR 20130087866 A KR20130087866 A KR 20130087866A KR 20150012400 A KR20150012400 A KR 20150012400A
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KR
South Korea
Prior art keywords
polymer
transparent electrode
physical properties
tactile
flexible transparent
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Application number
KR1020130087866A
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Korean (ko)
Inventor
윤성률
김건년
경기욱
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한국전자통신연구원
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Priority to KR1020130087866A priority Critical patent/KR20150012400A/en
Publication of KR20150012400A publication Critical patent/KR20150012400A/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/016—Input arrangements with force or tactile feedback as computer generated output to the user
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B21/00—Teaching, or communicating with, the blind, deaf or mute
    • G09B21/001—Teaching or communicating with blind persons
    • G09B21/003—Teaching or communicating with blind persons using tactile presentation of the information, e.g. Braille displays

Abstract

The present invention discloses a physically variable tactile display module capable providing a tactile texture without using a physical protrusion structure. According to an embodiment of the present invention, the physically variable tactile display module includes: a polymer structure unit which changes the physical properties of a polymer material with heat to implement a tactile texture on the surface of a display unit; a flexible transparent electrode unit which changes the physical properties of the polymer structure unit on the same area through using the heat generated by applying a current; and an electric circuit unit which adjust the current to apply the current to the flexible transparent electrode unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a tangential display module,

TECHNICAL FIELD The present invention relates to a tactile display technology capable of realizing various tactile sensations by changing the physical properties of a polymer thin film surface by supplying heat to a transparent transparent polymer thin film through a transparent flexible electrode.

Currently, portable handsets, touch screens, and electronic devices are providing high-resolution images due to the development of display technology. By combining the haptic feedback technology that transmits the touch through vibration by operating the actuator located at the bottom of the display, And provides a tactile user interface. As a device for providing touch, it has conventionally used a motor which is easy to control the reaction speed, low power and tactile output. However, since the motor has a limitation in miniaturization, it is difficult to mount on a ultra slim mobile device. It is difficult to apply it to navigation, digital information display (DID), monitor, and the like which need to provide tactile sensation only in a place where the user is reaching locally.

In order to overcome these disadvantages, recently, a technology related to a film type tactile module that can be mounted on a display panel has appeared. The film type tactile module is mainly divided into the case of using the electrostatic force and the case of using the deformation of the material itself using the electroactive polymer material. In the conventional method using electrostatic force, two sheets of substrates coated with a conductive material are charged on the respective substrates in the state that the conductive layers are opposed to each other, and the electrostatic force generated therebetween charges instantaneously It is a principle that generates tactile feeling by generating repulsive force. The actuator device composed of the two substrates is independently constructed above or below the touch panel.

In the case of using the electroactive polymer material, the electrostatic force formed when the electric field is applied to the electrodes coated on both sides of the electroactive polymer thin film having excellent dielectric property generates deformation and provides the touch. It is easy to apply to a tactile feedback device for flexible electronic devices. However, due to the limitation of the electric field in which the dielectric breakdown of the electroactive polymer material occurs, there is a limitation in achieving a sufficient output in a single thin film layer structure. Therefore, a multi-layer structure or an additional weight device There is a difficulty.

The conventional techniques described above require a multi-layer structure manufacturing and adding device to simultaneously provide position recognition by touch and sufficient tactile feedback, and it is difficult to realize various tactile sensations that can be detected by people other than vibration.

A related prior art is Korean Patent Laid-Open No. 10-2010-0131349 for active skin for a flexible tactile interface.

An object of the present invention is to provide a touch in real time without using a physical protruding structure on a display by changing the physical properties of the surface by supplying heat to the polymer thin film.

It is also an object of the present invention to provide a more effective display by suitably arranging a visual display and a region where a polymer thin film is physically changed.

According to an aspect of the present invention, there is provided a flexible property tactile display module including: a polymer structure part that changes a physical property of a polymer by heat to realize a touch on a display surface; A flexible transparent electrode portion that changes the physical properties of the polymer structure portion located in the longitudinal direction by heat generated by application of a current; And an electric circuit part for adjusting and applying a current to the flexible transparent electrode part.

At this time, the polymer structure part can change physical properties of the polymer in at least a part of the polymer structure part according to the position of the flexible transparent electrode part where heat is generated.

At this time, the tactile sensation may be a feeling of warmness and texture such as cold feeling.

At this time, the physical properties may be changed by at least one step according to the temperature of heat generated in the flexible transparent electrode part.

At this time, the physical deformation response speed may vary depending on the magnitude of the current applied to the flexible transparent electrode part.

At this time, the physical property restoration speed may vary depending on the characteristics of the polymer structure portion material and the flexible transparent electrode portion material.

In this case, the polymer structure may use a shape memory polymer as a material.

At this time, the flexible transparent electrode part may use at least one of a nano material and a transparent flexible electrode material having conductivity in a porous network structure as a material.

According to the present invention, by supplying heat to the polymer thin film to change the physical properties of the surface, tactile feedback can be provided in real time without using a physical protruding structure on the display.

In addition, the present invention can provide a more effective display by suitably disposing a region where the visual display and the polymer thin film are physically changed.

1 is a view showing a structure of a cross section of a display module according to an embodiment of the present invention.
FIG. 2 is a graph showing changes in the physical properties of the polymer structure part according to heat generation. FIG.
FIG. 3 is a diagram showing a change in the multistage physical properties of the polymer structure part according to heat generation.
FIG. 4 is a diagram illustrating implementation of characters, images, and Braille on a display according to an embodiment of the present invention.

The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a view illustrating a structure of a cross section of a tactile display module according to an embodiment of the present invention.

The variable physical property tactile display module is made of a transparent and flexible material, and various physical properties such as cold feeling and texture can be realized on the display by changing the physical properties of the display surface in real time or by changing only a specific part in real time. By providing a transparent flexible electrode formed on a biaxially dielectric dielectric thin film, the physical properties of the thin film can be changed to one or more physical properties by supplying heat to the entire polymer thin film or an optional partial region, realizing various types of tactile sensation in real time . In addition, the electrode patterns can be patterned in regions having different tactile senses, realizing tactile sensation without physically protruding on the plane of various display devices, or realizing images using touch.

Referring to FIG. 1, the variable physical property tactile display module includes a bi-stable polymer structure 101, a flexible transparent electrode portion 102 for generating heat through current application, a flexible transparent electrode portion 102 And an electric circuit unit 103 for applying the electric power to the electric circuit unit.

The polymer structure part 101 can change the physical properties such as the texture and the warmth of the polymer due to the heat generated from the flexible transparent electrode part 102, thereby realizing a touch on the surface of the display. At this time, it is preferable to use a shape memory polymer, which is a polymer having a bistable property and a dielectric property, as a material. PTFE (Poly Tert-Butyl Acrylate) may be a representative shape memory polymer having such characteristics, but it is also possible to use other shape memory polymers such as PTBA polymer.

A method of displaying tactile sensation through changes in the physical properties of the polymer structure part 101 is a method in which a current is applied to a flexible transparent electrode part 102 located in a certain area in the electric circuit part 103 to change the physical properties of the polymer structural part 101 It is possible to realize a touch. With this method, the user can express a desired picture, character, or braille on the display surface without using a physical protruding structure. Such an implementation method can be used not only as a braille display for the visually impaired but also as an image display function capable of reminding images without using braille. In addition, a visual image and a tactile image can be implemented in cooperation with each other, thereby realizing a more effective three-dimensional image.

When the physical property of the polymer structure part 101 changes, at least one or more changes may occur depending on the temperature of the heat generated in the flexible transparent electrode part 102. As a result, the polymer structure part 101 can be changed into a structure in which regions having various physical properties are selectively arranged due to the bistable polymer properties in which the physical properties largely vary depending on the temperature. In this case, by using the property that the viscosity of the material becomes stronger as the physical properties change to soft, it is possible to realize various textures due to the difference in viscosity depending on the regions by making different arrangement of regions having various physical properties. In addition, since the physical property change of the polymer structure part 101 is generated by heat, it is possible to realize the texture due to the change of the physical property and the touch due to the temperature difference or the temperature change speed difference at the same time by using the characteristics of the human body sensitive to heat sensing have. The change in the physical properties of the polymer structure part 101 may vary depending on the magnitude of the current applied to the flexible transparent electrode part 102 and the physical property restoration speed may vary depending on the characteristics of the material forming the polymer structure part 101 It can be different.

The flexible transparent electrode part 102 can change the physical properties of the polymer structural part 101 located in the same area by generating heat by receiving a current applied from the electric circuit part 103. The flexible transparent electrode unit 102 can be arranged in various design patterns according to the display purpose. 1A, a flexible transparent electrode part 102 embedded in a lower end surface of a polymer structure part 101 is connected to an electric circuit part 103 on a lower end surface of a polymer structure part 101. The structure in which the flexible transparent electrode part 102 is embedded in the polymer structure part 101 can be achieved by applying an electrode material to a substrate such as a glass silicon material, casting a shape memory material molecule onto the substrate, And a polymer forming process through a thermal curing process. At this time, various methods such as casting, photoresist-based exposure process, and spray coating can be applied to the electrode material. The electrode material constituting the transparent transparent electrode part 102 is preferably a nano material excellent in stretchability, flexibility and transparency, and is preferably a porous network structure such as a carbon nanotube or a silver nanowire. Nanomaterials can be representative. Referring to FIG. 1B, the flexible transparent electrode part 102 and the electric circuit part 103 are formed on the surface of the polymer structural part 101. When the flexible transparent electrode part 102 is formed on the surface of the material of the polymer structure part 101, graphene and ITO (indium tin oxide) or the like may be used as the material of the transparent transparent electrode part 102, Other transparent flexible electrode materials can be used. Referring to FIG. 1C, a flexible transparent electrode portion 102 and an electric circuit portion 103 are formed on the base portion 104. In the case where the flexible transparent electrode part 102 is formed on the base part 104 rather than the polymer structural part 101, the above-mentioned nano material and graphene, ITO or other transparent flexible electrodes Materials and the like can all be used. At this time, the base portion 104 is preferably made of a transparent and flexible material, but may not be flexible or transparent depending on the purpose of application. The property of the material of the transparent transparent electrode part 102 may affect the restoration speed of the physical property of the polymer structural part 101. In addition, depending on the magnitude of the current applied to the flexible transparent electrode part 102, the physical property deformation response speed of the polymer structural part 101 may be varied, and the step of changing physical properties depending on the temperature of the generated heat may also vary.

The electric circuit unit 103 applies a current to the flexible transparent electrode unit 102 and can apply current only to the flexible transparent electrode unit 102 located in the entirety or a part of the flexible transparent electrode unit 102 . It is preferable that the electric circuit portion 103 is formed in an independent region. It is preferable to use an electrode material capable of minimizing the contact resistance with the transparent transparent electrode portion 102, but it is not limited to the transparent flexible material.

The variable physical property tactile display module shown in FIGS. 1A, 1B, and 1C is a technology utilized in various fields such as a terminal, a touch screen, a flexible display, a braille display, and the like.

FIG. 2 is a graph showing changes in the physical properties of the polymer structure part according to heat supply.

Referring to FIG. 2, it can be seen that the physical properties of the polymer structure 201 change due to the heat generated in the flexible transparent electrode part 202.

2A, there is shown a state before the physical property of the polymer structural part 201 is changed due to no heat being generated in the transparent transparent electrode part 202. FIG. When heat is generated by applying a current from the electric circuit portion 203 to the flexible transparent electrode portion 202 in this state, the polymer structure portion 201 is changed to a polymer structure portion 205 having a changed physical property as shown in FIG. 2B . The polymer structure part 201 formed of a polymer having a bistable property and dielectric property may exhibit at least one or more changes in physical properties due to heat generated in the flexible transparent electrode part 202. In this case, the touch may be a sense of cold feeling and texture, and by using such a characteristic, the touch can be realized without physical protrusion on the display surface. In addition, the polymer structure part 205, which has already been changed in one step property, may be able to change physical properties at different stages according to the temperature of the heat generated in the flexible transparent electrode part 202, A tactile effect can be obtained. In order to express characters, images, braille, etc. on the display using the polymer structure part 205 changed in physical property by one step, the electric current is adjusted and applied in the electric circuit part 203 considering the arrangement of the flexible transparent electrode part 202 Can be expressed. In addition, it is possible to realize various texture and temperature changes according to the physical property change by controlling the position as well as the intensity of the current or changing the material of each constituent part.

FIG. 3 is a diagram showing the change in the multistage physical properties of the polymer structure part according to heat generation.

Referring to FIG. 3, the polymer structure 301 changes physical properties at various stages according to the temperature of the heat generated in the flexible transparent electrode portion, thereby realizing various tactile sensations in each region.

Referring to FIG. 3A, the polymer structural parts 302 are shown by changing the physical properties of the flexible transparent electrode part due to the generation of heat. Referring to FIG. 3B, the electric circuit part is applied to the flexible transparent electrode part located at the center with different current magnitudes, so that the polymer structural part 301 changed in one step physical property, which is located on the middle flexible transparent electrode part, The structure 303 is changed. Referring to FIG. 3C, the electric circuit portion is applied to the flexible transparent electrode portion located on the right side in a different magnitude of current, so that the one-stage changed polymer structure portion 301 located on the right flexible transparent electrode portion is changed And the polymer structure portion 304 is changed. The application of different current magnitudes to only the flexible transparent electrode portion located in a specific region differs in the temperature of the heat generated thereby to change the physical property change of the polymer structural portion located on the flexible transparent electrode portion. The polymer structure part 301 can be changed into a structure in which regions having various physical properties are selectively arranged by the property of a bistable polymer which largely varies depending on temperature. In this case, by using the property that the viscosity of the material becomes stronger as the physical properties change to soft, it is possible to realize various textures due to the difference in viscosity depending on the regions by making different arrangement of regions having various physical properties. In addition, since the physical property change of the polymer structure part 301 is generated by heat, it is possible to simultaneously realize the texture due to the change in physical properties and the touch due to the temperature difference or the temperature change speed difference by using the characteristics of the human body sensitive to heat sensing have.

FIG. 4 is a diagram illustrating implementation of characters, images, and Braille on a display according to an embodiment of the present invention.

Referring to FIG. 4, characters, images, braille characters, and the like can be displayed in a tactile sense such as a cool feeling and texture using the variable physical property tactile display module according to the present invention.

The variable physical property tactile display module is made of a transparent and flexible material, and various physical properties such as cold feeling and texture can be realized on the display by changing the physical properties of the display surface in real time or by changing only a specific part in real time. By providing a transparent flexible electrode formed on a biaxially dielectric dielectric thin film, the physical properties of the thin film can be changed to one or more physical properties by supplying heat to the entire polymer thin film or an optional partial region, realizing various types of tactile sensation in real time . In addition, the electrode patterns can be patterned in regions having different tactile senses, realizing tactile sensation without physically protruding on the plane of various display devices, or realizing images using touch.

As described above, the variable-tactile display module according to the present invention is not limited to the configuration and method of the embodiments described above, but the embodiments can be applied to all or a part of each embodiment so that various modifications can be made. Some of which may be selectively combined.

101, 201, 204, 301: Polymer structure
102, 202: flexible transparent electrode part
103, 203: electric circuit
104:
205, 302: Polymer structure changed in one step property
303: Polymer structure changed in two steps
304: Three-step polymer structure

Claims (1)

A polymer structure part for realizing a touch on the display surface by changing the physical properties of the polymer by heat;
A flexible transparent electrode portion that changes the physical properties of the polymer structure portion located in the longitudinal direction by heat generated by application of a current; And
And an electric circuit part for adjusting and applying a current to the flexible transparent electrode part.
KR1020130087866A 2013-07-25 2013-07-25 Tunable material property based tactile display modual KR20150012400A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110431215A (en) * 2017-04-19 2019-11-08 罗门哈斯电子材料韩国有限公司 Organic electroluminescent compounds and Organnic electroluminescent device comprising it
US11921929B2 (en) 2022-02-24 2024-03-05 Electronics And Telecommunications Research Institute Stereoscopic surface display device and operation method of the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110431215A (en) * 2017-04-19 2019-11-08 罗门哈斯电子材料韩国有限公司 Organic electroluminescent compounds and Organnic electroluminescent device comprising it
US11921929B2 (en) 2022-02-24 2024-03-05 Electronics And Telecommunications Research Institute Stereoscopic surface display device and operation method of the same

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