CN112051922A

CN112051922A - Tactile feedback device, preparation method thereof and electronic equipment

Info

Publication number: CN112051922A
Application number: CN202010799294.4A
Authority: CN
Inventors: 张愉; 江淼; 姚江波; 陈黎暄; 张鑫
Original assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2020-08-11
Filing date: 2020-08-11
Publication date: 2020-12-08
Also published as: WO2022032819A1

Abstract

The application discloses a tactile feedback device, a preparation method thereof and electronic equipment, wherein the tactile feedback device comprises a substrate; the conducting layer is arranged on the substrate; the insulating layer is arranged on the conductive layer; the insulating layer is made of a high-molecular polymer material, nano particles are doped in the high-molecular polymer material, and the dielectric constant of the nano particles is larger than 8 and smaller than 1100. The high-dielectric nano particles are doped in the high-molecular polymer to form the insulating layer with high dielectric property, so that the sensitivity and the safety of the touch feedback device are improved.

Description

Tactile feedback device, preparation method thereof and electronic equipment

Technical Field

The application relates to the field of display panels, in particular to a tactile feedback device, a manufacturing method of the tactile feedback device and electronic equipment.

Background

Five senses are the human perception of the world, namely vision, hearing, smell, taste and touch. The sense of touch is more real, but in the current interactive field, the development of the sense of touch direction only accounts for 15%, and the touch is still in the starting stage. The tactile feedback is to sense the tactile characteristics of the shape, texture and the like of a visual object by touching a screen with a naked finger, and the reality and the immersion of human-computer interaction operation are improved by utilizing a human tactile sensing channel. Therefore, the application field of the display panel can be expanded by superposing the touch feedback function on the display panel, and the audience experience is improved, such as a virtual keyboard, VR (virtual reality) commodity display, a blind reader and the like.

Hugh et al report on the cause of the formation of the surface touch and use electrostatic force devices to control parameters such as the amplitude of the excitation signal, thereby changing the surface touch, a classical electrostatic force tactile feedback model, consisting of three layers, namely a substrate, a conductive layer and an insulating layer, the formula is as follows:

where V (t) is the voltage between the two electrodes of the capacitor, d is the thickness of the insulating layer, A is the area of the electrode,₀dielectric constant in vacuum, dielectric constant of the insulating layer, and F electrostatic force felt by the user.

To maintain a high electrostatic force, the stimulus can be increased by increasing the voltage, but this increase in voltage can present a safety issue.

Accordingly, there is a need to develop a new haptic feedback device that overcomes the deficiencies of the prior art.

Disclosure of Invention

An object of the present invention is to provide a haptic feedback device capable of solving the problem of increasing the stimulus by increasing the voltage, which causes safety, in the prior art in order to make the audience feel strong haptic feedback.

To achieve the above object, the present invention provides a haptic feedback device including a substrate; the conducting layer is arranged on the substrate; the insulating layer is arranged on the conductive layer; the insulating layer is made of a high-molecular polymer material, nano particles are doped in the high-molecular polymer material, and the dielectric constant of the nano particles is larger than 8 and smaller than 1100.

The high-dielectric nano particles are doped in the high-molecular polymer to form the insulating layer with high dielectric property, so that the sensitivity and the safety of the touch feedback device are improved. The insulating layer can reach micron level and has relatively high touch feeling at relatively low voltage.

Further, in other embodiments, wherein the nanoparticles are one or more of rutile titanium oxide phase nanoparticles, barium titanate nanoparticles, barium strontium titanate nanoparticles, zirconium dioxide nanoparticles, tantalum pentoxide nanoparticles, hafnium dioxide nanoparticles, aluminum oxide nanoparticles, or lanthanum oxide nanoparticles.

Wherein the dielectric constant of the titanium oxide rutile phase nanoparticles is 110, the dielectric constant of the barium titanate nanoparticles is 145, the dielectric constant of the barium strontium titanate nanoparticles is 1000, the dielectric constant of the zirconium dioxide nanoparticles is 25, the dielectric constant of the tantalum pentoxide nanoparticles is 18.5-27.5, the dielectric constant of the hafnium dioxide nanoparticles is 21, and the dielectric constant of the aluminum oxide nanoparticles is 9.

Further, in other embodiments, the polymer material is one or more of polymethyl methacrylate (PMMA), Polydimethylsiloxane (PDMS), polyvinyl alcohol (PVA), Polystyrene (PS), polyvinyl phenol (PVP), poly (tert-butyl methacrylate) (PMBA), polyethylene terephthalate (PET), or Propylene Glycol Methyl Ether Acetate (PGMEA).

When the insulating layer is required to be high in rigidity, PMMA can be selected as a high molecular polymer material, and if the insulating layer is required to have high elasticity, PMBA can be selected as the high molecular polymer material.

Further, in other embodiments, the conductive layer is a single-electrode circuit or a dual-electrode circuit, and the material of the conductive layer is copper metal or silver metal or an indium tin oxide semiconductor.

Further, in other embodiments, wherein the thickness of the insulating layer is 4nm to 20000 nm; the electrostatic force felt by a user is in direct proportion to the dielectric constant of the insulating layer and in inverse proportion to the thickness of the insulating layer; however, the safety is proportional to the thickness of the insulating layer, and the greater the thickness of the insulating layer, the greater the safety. Therefore, the invention can ensure the thickness of the insulating layer and simultaneously improve the dielectric constant of the insulating layer, so that higher electrostatic force is kept.

In order to achieve the above object, the present invention further provides a manufacturing method for manufacturing the haptic feedback device according to the present invention, the manufacturing method including the steps of: providing a substrate; preparing a conductive layer on the substrate; doping the nano particles into a high molecular polymer to form a mixed solution; and coating the mixed solution on the conductive layer to form an insulating layer.

Further, in other embodiments, the step of doping the nanoparticles with the high molecular polymer to form the mixed solution includes subjecting the nanoparticles to a surface-hydrophobization treatment, and dispersing the nanoparticles subjected to the surface-hydrophobization treatment in a trichlorotoluene solution containing the high molecular polymer to form the mixed solution.

Further, in other embodiments, the nanoparticles are dispersed in the trichlorotoluene solution containing the high molecular polymer by stirring or ultrasonic dispersion.

Further, in other embodiments, the conductive layer is prepared on the substrate by laser, in-situ reduction or film-forming etching.

Further, in another embodiment, the mixed solution is coated on the conductive layer by spin coating, blade coating or ink jet printing, and then the mixed solution is uv-cured or high-temperature cured to form a solid insulating layer after being coated on the conductive layer.

Further, in other embodiments, the substrate is made of glass.

To achieve the above object, the present invention further provides an electronic device including the haptic feedback device according to the present invention.

Specifically, a display device includes a lower polarizer; the liquid crystal display panel is arranged on the lower polarizer; the tactile feedback device is arranged on the liquid crystal display panel; and the upper polaroid is arranged on the tactile feedback device. The tactile feedback device is placed on the display panel and is of an externally-hung structure.

Compared with the prior art, the invention has the beneficial effects that: the invention provides a touch feedback device, a preparation method thereof and electronic equipment. The electrostatic force felt by the user is in direct proportion to the dielectric constant of the insulating layer and in inverse proportion to the thickness of the insulating layer; however, the safety is proportional to the thickness of the insulating layer, and the greater the thickness of the insulating layer, the greater the safety. Therefore, the thickness of the insulating layer is ensured, and the dielectric constant of the insulating layer is improved, so that the haptic feedback device still has high electrostatic force.

Furthermore, the nano particles are doped in the high molecular polymer, and then the nano particles are coated on the conductive layer by adopting a spin coating or blade coating or ink-jet printing method to form the insulating layer, so that the method is simple and convenient, is easy to operate and is beneficial to large-size mass production.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a haptic feedback device provided in accordance with an embodiment of the present invention;

FIG. 2 is a flow chart of a method of making a haptic feedback device provided in accordance with an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a display device according to an embodiment of the present invention.

Description of the drawings:

haptic feedback device-100;

a substrate-10; a conductive layer-20;

an insulating layer-30; high molecular polymer material-31;

nanoparticle-32;

display device-200; a lower polarizer-110;

a liquid crystal display panel-120; an upper polarizer-130.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Among the prior art, the increase of the thickness of insulating layer is favorable to singing the life-span of tactile feedback device to promote device stability, the power that the finger atress is inversely proportional with the membrane thickness of insulating layer, and is directly proportional with the dielectric constant of insulating layer, consequently, change the characteristic of insulating layer, can adjust the surface touch under the same voltage condition.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a haptic feedback device 100 according to this embodiment. The haptic feedback device 100 includes a substrate 10, a conductive layer 20, and an insulating layer 30.

The substrate 10 is a glass substrate, the conductive layer 20 is disposed on the substrate 10, and the insulating layer 30 is disposed on the conductive layer 20.

The conductive layer 20 may be a single electrode circuit or a dual electrode circuit, and the material of the conductive layer 20 is copper metal or silver metal or indium tin oxide semiconductor.

The insulating layer 30 includes a high molecular polymer 31 material and nanoparticles 32 doped in the high molecular polymer 31 material.

The high polymer 31 is made of one or more of polymethyl methacrylate (PMMA), Polydimethylsiloxane (PDMS), polyvinyl alcohol (PVA), Polystyrene (PS), polyvinyl phenol (PVP), poly (tert-butyl methacrylate) (PMBA), polyethylene terephthalate (PET), or Propylene Glycol Methyl Ether Acetate (PGMEA).

When the insulating layer 30 needs to have higher rigidity, PMMA can be selected as the high molecular polymer 31 material, and if the insulating layer needs to have higher elasticity, PMBA can be selected as the high molecular polymer 31 material.

The dielectric constant of the nano-particles 32 is greater than 8 and less than 1100, and the nano-particles 32 are one or more of titanium oxide rutile phase nano-particles, barium titanate nano-particles, barium strontium titanate nano-particles, zirconium dioxide nano-particles, tantalum pentoxide nano-particles, hafnium dioxide nano-particles, aluminum oxide nano-particles or lanthanum oxide nano-particles.

Insulating layers of different dielectric constants can be obtained by selecting different types and proportions of nanoparticles.

The high dielectric nanoparticles 32 are doped in the high molecular polymer 31 to form the insulating layer 30 with high dielectric properties, thereby improving the sensitivity and safety of the haptic feedback device 100. By using the high dielectric insulating layer 30, the insulating layer 30 can be made to be micron-sized, and still have a strong touch feeling at a low voltage.

The thickness of the insulating layer 30 is 4nm-20000 nm; the electrostatic force experienced by the user is proportional to the dielectric constant of the insulating layer 30 and inversely proportional to the thickness of the insulating layer 30; however, the safety is proportional to the thickness of the insulating layer 30, and the greater the thickness of the insulating layer 30, the greater the safety. Therefore, the present invention increases the dielectric constant of the insulating layer 30 while ensuring the thickness of the insulating layer 30, so that a higher electrostatic force is maintained.

Referring to fig. 2, fig. 2 is a flowchart illustrating a method for manufacturing a haptic feedback device according to an embodiment of the present invention, where the method includes steps 1-4.

Step 1: a substrate 10 is provided, and the substrate 10 is made of glass.

Step 2: the conductive layer 20 is prepared on the substrate 10, the conductive layer 20 can be a single-electrode circuit or a double-electrode circuit, and the conductive layer 20 is made of copper metal or silver metal or indium tin oxide semiconductor.

The conductive layer 20 is prepared on the substrate 10 by laser, in-situ reduction or film-forming etching.

And step 3: the nanoparticles 32 are doped into the high molecular polymer 31 to form a mixed solution.

Specifically, the nanoparticles 32 are subjected to surface hydrophobization, and the nanoparticles 32 subjected to surface hydrophobization are dispersed in a trichlorotoluene solution containing the high molecular polymer 31 by machine stirring, and stirred at a rotation speed of 180 rpm to form a mixed solution.

In other embodiments, the nanoparticles 32 may also be dispersed in the trichlorotoluene solution containing the high molecular polymer 31 by using an ultrasonic dispersion method to form a mixed solution.

Wherein the doping proportion of the nano-particles 32 in the mixed solution is 1% -10%.

When the insulating layer 30 is required to have high rigidity, PMMA can be selected as a high molecular polymer 31 material, and the doping proportion of PMMA in the mixed solution is 5% -20%; if the material is required to have better elasticity, PMBA can be selected as the high molecular polymer 31 material, and the doping proportion of the PMBA in the mixed solution is 2-10%.

The nanoparticles 32 are one or more of rutile titanium oxide phase nanoparticles, barium titanate nanoparticles, barium strontium titanate nanoparticles, zirconium dioxide nanoparticles, tantalum pentoxide nanoparticles, hafnium dioxide nanoparticles, aluminum oxide nanoparticles, or lanthanum oxide nanoparticles.

And 4, step 4: the mixed solution is coated on the conductive layer 20 to form an insulating layer 30.

The mixed solution is coated on the conductive layer 20 by spin coating, blade coating, or inkjet printing, and then the mixed solution is uv-cured or high-temperature cured after the mixed solution is coated on the conductive layer 20, thereby forming the solid insulating layer 30.

The nano particles are doped in the high molecular polymer, and then the nano particles are coated on the conducting layer by adopting a spin coating or blade coating or ink-jet printing method to form the insulating layer.

Embodiments of the present invention further provide an electronic device including the haptic feedback device 100 according to the present invention.

Specifically, referring to fig. 3, fig. 3 is a schematic structural diagram of a display device 200 according to the present embodiment. The display device 200 includes a lower polarizer 110, a liquid crystal display panel 120, a haptic feedback device 100, and an upper polarizer 130.

The liquid crystal display panel 120 is disposed on the lower polarizer 110; the haptic feedback device 100 is disposed on the liquid crystal display panel 120; the upper polarizer 130 is disposed on the haptic feedback device 100.

Wherein the haptic feedback device 100 is placed on the display panel in an externally hung configuration.

Compared with the prior art, the invention has the beneficial effects that: the invention provides a touch feedback device, a preparation method thereof and electronic equipment. The electrostatic force experienced by the user is proportional to the dielectric constant of the insulating layer and inversely proportional to the thickness of the insulating layer 30; however, the safety is proportional to the thickness of the insulating layer, and the greater the thickness of the insulating layer, the greater the safety. Therefore, the thickness of the insulating layer is ensured, and simultaneously, the dielectric constant of the insulating layer is improved, so that the touch feedback device still has higher electrostatic force.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The haptic feedback device, the manufacturing method thereof, and the electronic device provided in the embodiments of the present application are described in detail above, and specific examples are applied in the present application to explain the principles and embodiments of the present application, and the description of the embodiments above is only used to help understand the technical solutions and the core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A haptic feedback device comprising

A substrate;

the conducting layer is arranged on the substrate;

the insulating layer is arranged on the conductive layer;

the insulating layer is made of a high-molecular polymer material, nano particles are doped in the high-molecular polymer material, and the dielectric constant of the nano particles is larger than 8 and smaller than 1100.

2. A haptic feedback device as recited in claim 1 wherein said nanoparticles are one or more of rutile titanium oxide phase nanoparticles, barium titanate nanoparticles, barium strontium titanate nanoparticles, zirconium oxide nanoparticles, tantalum pentoxide nanoparticles, hafnium dioxide nanoparticles, aluminum oxide nanoparticles, or lanthanum oxide nanoparticles.

3. A haptic feedback device as recited in claim 1 wherein said polymer material is one or more of polymethylmethacrylate, polydimethylsiloxane, polyvinyl alcohol, polystyrene, polyvinylphenol, poly-t-butyl methacrylate, polyethylene terephthalate, or propylene glycol methyl ether acetate.

4. A haptic feedback device as recited in claim 1 wherein said insulating layer has a thickness of 4nm-20000 nm.

5. A method of making a haptic feedback device as recited in claim 1, comprising the steps of:

providing a substrate;

preparing a conductive layer on the substrate;

doping the nano particles into a high molecular polymer to form a mixed solution;

and coating the mixed solution on the conductive layer to form an insulating layer.

6. The method of claim 5, wherein the step of doping the nanoparticles with the high molecular weight polymer to form a mixed solution comprises

And performing surface hydrophobization on the nanoparticles, and dispersing the nanoparticles subjected to surface hydrophobization in a solution containing the high molecular polymer to form the mixed solution.

7. The method according to claim 6, wherein the nanoparticles are dispersed in the trichlorotoluene solution containing the high molecular polymer by stirring or ultrasonic dispersion.

8. The preparation method according to claim 6, wherein the doping ratio of the nanoparticles in the mixed solution is 1% to 10%.

9. The method according to claim 5, wherein the mixed solution is applied to the conductive layer by spin coating, doctor blading or ink jet printing, and then the mixed solution is uv-cured or high temperature-cured to form a solid insulating layer.

10. An electronic device comprising the haptic feedback device of any one of claims 1-4.