WO2024060496A1

WO2024060496A1 - Touch display apparatus and manufacturing method therefor

Info

Publication number: WO2024060496A1
Application number: PCT/CN2023/076081
Authority: WO
Inventors: 许峰
Original assignee: 武汉华星光电半导体显示技术有限公司
Priority date: 2022-09-23
Filing date: 2023-02-15
Publication date: 2024-03-28
Also published as: CN115494978A

Abstract

The present application provides a touch display apparatus and a manufacturing method therefor. The touch display apparatus comprises an organic light-emitting display module, a touch module, an organic cover plate, and an optical adhesive. The touch module is disposed on a light emitting side of the organic light-emitting display module. The organic cover plate is disposed on the side of the touch module away from the organic light-emitting display module. The optical adhesive is disposed between the touch module and the organic cover plate. A first conductive material is dispersed in the organic cover plate and/or the optical adhesive.

Description

Touch display device and manufacturing method thereof

Technical field

The present application relates to the field of touch display, and in particular, to a touch display device and a manufacturing method thereof.

Background technique

Organic Light-Emitting Diode (OLED) flexible devices are considered a new generation of display technology. OLED flexible devices can be used to prepare display modules with fixed curvature and even repeated folding. With the development of technology, four-sided curved screens have gradually become mainstream. The four-curved glass cover is difficult and costly to process, and the curved surface part is easily damaged by external impact. The feasibility of replacing glass cover with organic cover is: first, the weight of organic cover is much less than that of glass cover. Generally, the density of organic cover is less than 1.5g/cm ³ , while the density of glass is greater than 2.5g/cm ³ ; Secondly, the organic cover itself is difficult to undergo fracture damage and will not break even under strong external impact, which increases the durability and safety of the product; finally, the organic cover is easy to form and process, and in the 3D cover This is especially noticeable during the processing process. The specific manifestation is that the softening point of organic materials is low. Therefore, no matter whether hot bending or injection molding is used, the temperature does not need to be too high during the process. It can generally be controlled within 150 degrees Celsius. The hot bending molding process of glass is at least Temperatures above 500 degrees Celsius are required to achieve this.

Although organic covers have many advantages, organic covers suffer from insufficient mechanical strength. No matter what kind of organic materials and their combinations are used, for example, methyl methacrylate (PMMA) or polycarbonate (PC) or the combination of PMMA and PC, they cannot achieve mechanical strength similar to that of glass. Because generally the elastic modulus of organic polymers is less than 5Gpa, while the elastic modulus of glass often exceeds 70Gpa. In order to increase the strength of the organic cover, it is inevitably necessary to increase the thickness of the cover. For example, commonly used glass covers use a thickness of about 550um, while organic covers often require a thickness of 800um or even more than 1000um. As a result, in a display device with a touch module provided under the cover, the sensitivity of the touch decreases due to the increase in thickness of the organic cover. Therefore, there is a need to provide a touch display device that can improve touch sensitivity and signal-to-noise ratio.

technical problem

The purpose of this application is to provide a touch display device that can improve the sensitivity and signal-to-noise ratio of touch. Set.

Technical solutions

This application provides a touch display device, which includes:

Organic light-emitting display module;

A touch module is provided on the light-emitting side of the organic light-emitting display module;

An organic cover plate, disposed on a side of the touch control module away from the organic light emitting display module; and

Optical glue, disposed between the touch module and the organic cover;

Wherein, the first conductive material is dispersed in the organic cover plate and/or the optical glue.

Optionally, in some embodiments, the touch display device further includes a color filter layer, the color filter layer is disposed between the touch module and the optical glue, the color filter layer includes a plurality of There are two color filters arranged at intervals and a black matrix arranged between two adjacent color filters, and the first conductive material includes a black conductive material.

Optionally, in some embodiments, the black conductive material is a carbon nanotube, the tube length of the carbon nanotube is greater than 0 microns and less than 1 micron, and the tube diameter of the carbon nanotubes ranges from 1 nanometer to 2 nanometers. nanometer.

Optionally, in some embodiments, the black conductive material is a carbon nanotube, the length of the carbon nanotube ranges from 50 nanometers to 200 nanometers, and the diameter of the carbon nanotube ranges from 0.8 nanometers to 1.2 nanometers.

Optionally, in some embodiments, the dielectric constant of the organic cover plate or the optical glue dispersed with the first conductive material at 1 kHz is greater than or equal to 3.2 Far/meter, and the transmittance of visible light is greater than Or equal to 80%, and the transmittance of ultraviolet light is less than or equal to 40%.

Optionally, in some embodiments, the organic cover or the optical glue includes a polymer layer and the first conductive material dispersed in the polymer layer. The organic cover or the optical glue The glue is made with a mass ratio of the first conductive material to the monomer of the polymer layer being greater than or equal to 0.1:100 and less than or equal to 5:100.

Optionally, in some embodiments, the dielectric constant at 1 kHz of the organic cover plate or the optical glue in which the first conductive material is dispersed is greater than or equal to 12 Farad/meter.

Optionally, in some embodiments, the organic cover plate or the optical glue includes a polymer layer and The first conductive material dispersed in the polymer layer. The material of the polymer layer includes at least one of acrylic resin, silicone gel, polyurethane glue, and epoxy resin. The polymer layer has a cross-linked network. structure, the organic cover plate or the optical glue further includes a dispersant and a cross-linking agent, and the first conductive material is selected from at least one of metal particles, carbon particles, carbon nanotubes and graphene.

Optionally, in some embodiments, the touch display device further includes a flat layer, the flat layer is located between the color filter and the optical glue and covers the color filter layer, and the flat layer, A second conductive material is dispersed in at least one of the color filter and the black matrix.

Optionally, in some embodiments, the touch display device further includes a polarizer, the polarizer is disposed between the touch module and the organic cover, and the optical glue includes a first optical glue and a second optical glue, the first optical glue is located between the polarizer and the touch module, the second optical glue is located between the polarizer and the organic cover, the The first conductive material is dispersed in the first optical glue and/or the second optical glue.

Optionally, in some embodiments, the polarizer includes pressure-sensitive adhesive, and a third conductive material is dispersed in the pressure-sensitive adhesive.

This application provides a touch display device, which includes:

Organic light-emitting display module;

An organic cover plate is provided on the side of the touch module away from the organic light-emitting display module;

A polarizer, disposed between the touch module and the organic cover plate;

Wherein, the polarizer includes a pressure-sensitive adhesive, in which a first conductive material is dispersed.

Optionally, in some embodiments, the touch display device further includes an optical glue disposed between the touch module and the organic cover, the organic cover and/or the optical glue A second conductive material is dispersed therein.

Optionally, in some embodiments, the second conductive material includes carbon nanotubes, the tube length of the carbon nanotubes is greater than 0 microns and less than 1 micron, and the tube diameter of the carbon nanotubes ranges from 1 nanometer to 1 nanometer. 2nm.

Optionally, in some embodiments, the second conductive material is carbon nanotubes, the tube length of the carbon nanotubes ranges from 50 nanometers to 200 nanometers, and the tube diameter of the carbon nanotubes ranges from 0.8 nanometers to 0.8 nanometers. 1.2nm.

Optionally, in some embodiments, the dielectric constant of the organic cover plate or the optical glue dispersed with the second conductive material at 1 kHz is greater than or equal to 3.2 Far/meter, and the transmittance of visible light is greater than Or equal to 80%, and the transmittance of ultraviolet light is less than or equal to 40%.

Optionally, in some embodiments, the organic cover or the optical adhesive includes a polymer layer and the second conductive material dispersed in the polymer layer, and the organic cover or the optical adhesive is made with a mass ratio of the second conductive material to the monomer of the polymer layer greater than or equal to 0.1:100 and less than or equal to 5:100.

Optionally, in some embodiments, the organic cover or the optical glue includes a polymer layer and the second conductive material dispersed in the polymer layer, and the material of the polymer layer includes acrylic. At least one of resin, silica gel, polyurethane glue, and epoxy resin, the polymer layer has a cross-linked network structure, the organic cover plate or the optical glue also includes a dispersant and a cross-linking agent, and the second The conductive material is selected from at least one of metal particles, carbon particles, carbon nanotubes and graphene.

Optionally, in some embodiments, the optical glue includes a first optical glue and a second optical glue, the first optical glue is located between the polarizer and the touch module, and the second optical glue Optical glue is located between the polarizer and the organic cover plate, and the second conductive material is dispersed in the first optical glue and/or the second optical glue.

This application provides a manufacturing method for a touch display device, which includes the following steps:

Provide an organic light-emitting display module;

Provide a touch module, and set the touch module on the light-emitting side of the organic light-emitting display module;

Provide an optical glue, and arrange the optical glue on the side of the touch module away from the organic light-emitting display module; and

Provide an organic cover plate, and set the organic cover plate on the side of the optical glue away from the touch module;

Wherein, the step of providing an optical glue or providing an organic cover plate includes:

Mix monomers, initiators and solvents;

causing the monomer to polymerize to form a linear polymer;

Pause the reaction, add a first conductive material to the linear polymer, and disperse the first conductive material in the linear polymer;

Adding a cross-linking agent to the linear polymer allows the linear polymer dispersed with the first conductive material to react and transform into a polymer having a cross-linked network structure; and

The polymer with a cross-linked network structure is coated on a substrate, and after drying, the cover plate or the optical glue is obtained.

beneficial effects

In this application, by adding a first conductive material when preparing an organic cover plate and/or optical glue, the dielectric properties of the organic material as a whole are rapidly increased, thereby obtaining an organic cover plate and/or optical glue with a high dielectric constant. According to the capacitance calculation formula: C=ε _r ε ₀ A/d, where C represents the capacitance, ε _r represents the relative dielectric constant of the dielectric material between the two parallel plates of the capacitor, and ε ₀ represents the vacuum absolute dielectric Constant, A represents the relative area between the two parallel plates of the capacitor, d represents the capacitance distance. When ε ₀ , A and d are fixed and ε _r increases, the capacitance C increases, and the capacitance received by the touch module The amount of change increases, thereby improving the sensitivity and signal-to-noise ratio of the touch module.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions in the present application more clearly, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

FIG. 1 is a structural diagram of a touch display device according to an embodiment of the present application.

FIG. 2 is a schematic top view of the touch module of FIG. 1 .

FIG. 3 is a structural diagram of a touch display device according to another embodiment of the present application.

FIG. 4 is a schematic structural diagram of the polarizer of FIG. 3 .

FIG. 5 is a flow chart of a manufacturing method of a touch display device according to an embodiment of the present application.

FIG. 6 is a schematic diagram of the step of providing an organic cover plate or providing an optical glue in FIG. 5 .

Embodiments of the invention

The technical solutions in this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, those skilled in the art will not create any All other implementation methods obtained under the premise of sexual labor fall within the scope of protection of this application.

In this application, unless otherwise expressly provided and limited, the first feature "above" or "below" the second feature may include the first and second features directly, or may include the first and second features not not directly connected but through additional characteristic contact between them. Furthermore, the terms "above", "above" and "above" a first feature on a second feature include the first feature being directly above and diagonally above the second feature, or simply mean that the first feature is higher in level than the second feature. “Below”, “under” and “under” the first feature is the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature is less horizontally than the second feature. In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, the features defined as “first” and “second” may explicitly or implicitly include one or more features.

For capacitive touch screens, whether it is self-capacitance or mutual capacitance, the touch screen needs to have higher sensitivity, and to have higher sensitivity, the dielectric properties of the material need to be improved. Specifically, C=ε _r ε ₀ A/d, C represents the capacitance, ε _r represents the relative dielectric constant of the dielectric material between the two parallel plates of the capacitor, ε ₀ represents the absolute dielectric constant of vacuum, A represents the relative area between the two parallel plates of the capacitor, and d represents the capacitance distance. The larger the capacitance C, the higher the capacitance change, the higher the gain and the higher the signal-to-noise ratio that can be obtained when the finger touches the capacitive touch screen. In order to improve the strength of the cover, the thickness of the material must be increased. Assume that the thickness of the glass cover is 500um and the organic cover is 1000um. The relative dielectric constant of the glass is often greater than 7, assuming it is 7.5, while the relative dielectric constant of the organic cover material The dielectric constant is generally relatively small, typically PMMA, which is often less than 3, assuming it is 2.5. In this way, it can be seen from the formula that after using the organic cover, the change in capacitance C during touch is only 1/6 of that when using the glass cover, and the sensitivity and signal-to-noise ratio are greatly reduced. As a solution, although some high-dielectric organic materials can be used to make the cover, other problems will inevitably be introduced. For example, using polyvinylidene fluoride (PVDF) as the material of the organic cover has its performance, cost and processing technology. New problems will arise.

In view of this, the present application provides a touch display device, which includes an organic light-emitting display module, a touch module, an organic cover plate, and an optical glue. The touch module is arranged on the light-emitting side of the organic light-emitting display module. The organic cover is disposed on the side of the touch module away from the organic light-emitting display module. The optical glue is arranged between the touch module and the organic cover. The first conductive material is dispersed in the organic cover plate and/or optical glue.

Hereinafter, specific embodiments of the present application will be described with reference to the drawings.

1 , a touch display device 100 according to an embodiment of the present application is a touch display device 100 having a depolarizer (POL-LESS) structure. Optionally, the touch display device 100 is a flexible touch display device, a curved touch display device, or a foldable touch display device.

The touch display device 100 includes an organic light-emitting display module 10 , a touch module 20 , an organic cover 30 and an optical glue 40 . The touch module 20 is disposed on the light emitting side of the organic light emitting display module 10 . The organic cover 30 is disposed on the side of the touch module 20 away from the organic light-emitting display module 10 . The optical glue 40 is disposed between the touch module 20 and the organic cover 30 . The first conductive material is dispersed in the organic cover 30 and/or the optical glue 40 .

The organic light-emitting display module 10 is used to display images. Depending on the driving type, the organic light-emitting display module 10 can be an active matrix organic light-emitting diode (Active Matrix Organic Light-emitting Diode, AMOLED) display module or a passive matrix organic light-emitting diode (Passive Matrix Organic Light-emitting Diode, PMOLED) display module. Group. Specifically, the organic light-emitting display module 10 includes an array substrate (also called a driving backplane) 11 and a light-emitting layer 12 disposed on the array substrate 11 . The array substrate 11 includes a substrate (not shown) and a pixel driving circuit (not shown) provided on the substrate. Taking AMOLED as an example, the pixel drive circuit can be a pixel drive circuit commonly used in this field such as 2T1C, 3T1C, 5T1C or 7T1C. The light-emitting layer 12 includes a pixel definition layer 121 and a light-emitting device 122. The pixel definition layer 121 has an opening 121a, and the light-emitting device 122 is disposed in the opening 121a. The light-emitting device 122 may be a top-emitting OLED (Top-emitting OLED, TEOLED) device or a bottom-emitting OLED (Bottom-emitting OLED, BEOLED). Optionally, the light-emitting device 122 may include an anode, a cathode, and a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer (all not shown) disposed in sequence between the anode and the cathode. The organic light-emitting display module 10 also includes an encapsulation layer 13 covering the light-emitting layer 12 . The encapsulation layer 13 may be a thin film encapsulation layer. The thin film encapsulation layer includes at least one inorganic layer and at least one organic layer that are alternately stacked. The inorganic layer may be selected from inorganic materials such as aluminum oxide, silicon oxide, silicon nitride, silicon oxynitride, silicon carbide, titanium oxide, zirconium oxide, zinc oxide, and the like. The organic layer is selected from epoxy resin, polyimide (PI), polyethylene terephthalate (PET), polycarbonate (PC), polyethylene (PE), polyacrylate (PA), etc. organic material.

The touch module 20 is used to detect touch actions. The touch module 20 can be a self-capacitive touch module or a mutual-capacitive touch module. Referring to FIG. 2 , taking the mutual-capacitive touch module 20 as an example, the touch module 20 includes a plurality of transmitting electrodes TX and a plurality of receiving electrodes RX insulated from the plurality of transmitting electrodes TX. The plurality of transmitting electrodes TX and the plurality of receiving electrodes RX may be arranged in the same layer or in different layers. In some embodiments, the plurality of transmitting electrodes TX and the plurality of receiving electrodes RX are arranged in the same layer. The plurality of transmitting electrodes TX are arranged in a plurality of rows along a first direction X, and the transmitting electrodes TX in the same row are connected to each other, and the plurality of rows of transmitting electrodes TX are arranged in columns along a second direction Y intersecting with the first direction X. The plurality of receiving electrodes RX are arranged in a plurality of columns along a second direction Y, and the receiving electrodes RX in the same column are connected to each other, and the plurality of rows of receiving electrodes RX are arranged in columns along the first direction X. Although not shown in the figure, the receiving electrodes RX in the same column are connected by wiring below. Optionally, the first direction X is perpendicular to the second direction Y. The "rows" and "columns" referred to herein do not necessarily mean that the "rows" and "columns" are perpendicular to each other, nor do they limit their extension directions. In the mutual capacitance touch module 20, by providing a digital voltage to the transmitting electrode TX and measuring the charge received by the receiving electrode RX, the charge received on the receiving electrode RX is proportional to the mutual capacitance between the two electrodes. When a touch action occurs between the transmitting electrode TX and the receiving electrode RX, the mutual capacitance decreases, and therefore, the charge received on the receiving electrode RX also decreases. Thus, whether a touch state exists is detected by detecting the charge on the receiving electrode RX.

The organic cover 30 covers the touch module 20 to protect the organic light-emitting display module 10 and the touch module 20 and provide a touch interface. In some embodiments, the organic cover 30 is a flexible light-transmitting cover. Optionally, the organic cover 30 includes a polymer layer and a first conductive material dispersed in the polymer layer. The material of the polymer layer can be selected from light-transmitting organic materials such as polymethylmethacrylate (PMMA), polycarbonate (PC), and polyimide (PI). These resin materials can be used alone or mixed to form a polymer layer. The first conductive material is selected from at least one of metal particles, carbon particles, carbon nanotubes and graphene. Among them, the metal particles can be copper, iron, aluminum, silver and other metal particles. Optionally, the polymer layer has a cross-linked network structure, and the organic cover 30 further includes a dispersant and a cross-linking agent. The dispersant is used to disperse the first conductive material in the polymer layer. Cross-linking agents are used to form a cross-linked network structure in the polymer layer.

The optical glue 40 is used to bond the organic cover 30 and the film layer below the organic cover 30 . Optionally, the optical glue 40 includes a polymer layer and a first conductive material dispersed in the polymer layer. The material of the polymer layer may include at least one of acrylic resin, silicone gel, polyurethane glue, and epoxy resin. These resin materials can be used alone or mixed to form a polymer layer. Acrylic resin can specifically be poly Methacrylic resin. The first conductive material is selected from at least one of metal particles, carbon particles, carbon nanotubes and graphene. Among them, the metal particles can be copper, iron, aluminum, silver and other metal particles. Optionally, the polymer layer has a cross-linked network structure, and the optical glue 40 also contains a dispersant and a cross-linking agent. The dispersant is used to disperse the first conductive material in the polymer layer. Cross-linking agents are used to form a cross-linked network structure in the polymer layer.

In this application, by adding a first conductive material when preparing the organic cover 30 and/or optical glue 40, the dielectric properties of the organic material as a whole are rapidly increased, thereby obtaining the organic cover 30 and/or having a high dielectric constant. Or optical glue 40.

"Percolation theory" is the best theoretical explanation so far for the change of dielectric properties of insulator-conductor dielectric composite materials with the filling amount of conductive filler. For the classic two-phase composite system, as the filling amount of filler changes, its phase distribution undergoes a qualitative change from dispersion to percolation cluster structure. During this change process, extremely irregular continuous phases and their phases are formed. Interfaces can only be explained and analyzed with the help of percolation theory. When a conductive filler is added to an organic polymer, when a small amount is filled, the conductive filler is randomly arranged in the matrix. As the doping amount of fillers increases, the spacing between fillers becomes smaller and agglomeration begins to occur in the matrix. When the doping amount increases to a certain amount, the conductor fillers are connected to each other to form a conductive network structure, forming an electron tunneling effect; correspondingly, the conductivity of the material will increase by an order of magnitude, transforming from an insulator to a conductor. When undergoing this transition, the conductor volume content in the composite system is called the percolation threshold fc. It was found that near the percolation threshold fc, the dielectric constant of the material also undergoes a nonlinear mutation. When the volume fraction of the conductor gradually approaches the percolation threshold fc from below the percolation threshold fc, the dielectric constant of the material increases rapidly. That is to say, for a composite material system composed of conductive particles dispersed into a dielectric matrix, the "percolation effect" produced by changes in the dielectric properties with the content of conductive particles can change the conductivity of the composite material and greatly improve the conductivity of the composite material. Dielectric constant.

Based on the percolation theory, when a certain amount of conductive substance is mixed into a dielectric material, the dielectric constant of the dielectric material will rise sharply, and the change amplitude can be as high as several orders of magnitude. Utilizing this principle, by adding the first conductive material when preparing the organic cover plate and/or optical glue, the dielectric properties of the organic material as a whole are rapidly increased, thereby obtaining an organic cover plate and/or optical glue with a high dielectric constant. . According to the capacitance calculation formula: C=ε _r ε ₀ A/d. When ε ₀ , A and d are fixed and ε _r increases, the capacitance C increases, and the capacitance change received by the touch module increases, thereby improving the sensitivity and signal-to-noise ratio of the touch module. It should be noted that the "high dielectric constant" referred to in this application is only relative to conventional organic covers or optical glues, and does not mean It means that its dielectric constant is up to a certain range.

It should be noted that the first conductive material can be dispersed in one of the organic cover plate 30 and the optical adhesive 40. When the first conductive material is dispersed in both the organic cover plate 30 and the optical adhesive 40, the type and mass ratio of the first conductive material dispersed in the organic cover plate 30 and the optical adhesive 40 can be the same or different. The type and mass ratio of the first conductive material can be selected according to the performance of the organic cover plate 30 and the optical adhesive 40. In addition, since the thickness of the organic cover plate 30 and the optical adhesive 40 is large enough, for example, the thickness of the optical adhesive 40 is generally 100 microns to 200 microns, adding the first conductive material to the organic cover plate 30 and the optical adhesive 40 is more effective in improving the dielectric constant than adding the first conductive material to other components. Since the material used in the optical adhesive 40, such as polymethacrylic acid resin, has a lower material modulus and viscosity, the material has a stronger fluidity, and the first conductive material is better dispersed in the optical adhesive 40, thereby ensuring the display performance. It should be noted that the thickness of the organic cover plate 30 and the optical adhesive 40 does not affect the dielectric constant, nor does it basically affect the transmittance.

Optionally, the dielectric constant of the organic cover 30 or the optical glue 40 dispersed with the first conductive material at 1 kHz is greater than or equal to 3.2 Farad/meter, preferably greater than or equal to 12 Farad/meter; the transmittance of visible light is greater than or equal to Equal to 80%, preferably greater than or equal to 85%; and the transmittance of ultraviolet light is less than or equal to 40%, preferably less than or equal to 30%. The increase in the dielectric constant of the organic cover 30 or optical glue 40 added with the first conductive material is beneficial to the improvement of touch sensitivity. As a touch display device, it is hoped that the light transmittance is as large as possible and the ultraviolet light transmittance is as small as possible, so as to reduce the impact of ultraviolet light on the display. In addition, the “transmittance of ultraviolet light” in this application refers to the transmittance of light in the ultraviolet (UV) band, for example, light with a wavelength of about 340 nanometers.

When the mass ratio of the first conductive material is too large, the material will lose its dielectric properties, and when the mass ratio of the first conductive material is too small, the improvement in dielectric properties is not obvious. Optionally, the organic cover 30 or the optical glue 40 is made with a mass ratio of the first conductive material to the monomer of the polymer layer that is greater than or equal to 0.1:100 and less than or equal to 5:100. More preferably, the mass ratio of the first conductive material to the monomer of the polymer layer ranges from 0.5:100 to 2:100. It should be noted that the polymer layer is mainly composed of a polymer, and the monomer of the polymer layer refers to the monomer of the polymer constituting the polymer layer. Specifically, monomer refers to a general term for small molecules that can be polymerized with molecules of the same or other types. They are simple compounds that can undergo polymerization reactions or polycondensation reactions to synthesize polymer compounds. They are low-molecular raw materials used to synthesize polymers. . The monomers of the polymer layer are generally unsaturated And, cyclic or low molecular compounds containing two or more functional groups. For example, vinyl chloride CH ₂ CHCl monomer can be polymerized to form polyvinyl chloride; caprolactam monomer can be polymerized to form polycaprolactam. For example, ethylene, propylene, vinyl chloride, styrene, etc. are the monomers used to synthesize polyethylene, polypropylene, polyvinyl chloride and polystyrene, and are also the structural units that constitute these four polymer compounds. Specifically, the material of the polymer layer is polymethacrylic resin as an example, the monomer of the polymer layer is alkoxyalkyl acrylate, and the first conductive material is carbon nanotubes as an example, then the carbon nanotubes and acrylic alkyl The mass ratio of oxyalkyl ester ranges from 0.1:100 to 5:100.

The touch display device 100 further includes a color filter layer 50 , which is disposed between the touch module 20 and the optical glue 40 . The color filter layer 50 is used to replace the polarizer. The color filter layer 50 includes a plurality of spaced apart color filters 51 and a black matrix 52 disposed between two adjacent color filters 51 . The first conductive material includes a black conductive material. Moreover, the color filter corresponds to the light-emitting device one-to-one, and the pixel definition layer 121 is black. Specifically, the optical glue 40 includes a polymer layer and black conductive material dispersed in the polymer layer. The black conductive material can be carbon particles, carbon nanotubes, graphene, etc. In POL-LESS display devices, the addition of black conductive materials will bring other advantages. For example, it can absorb part of the ambient light, especially the ultraviolet light in the ambient light, which will help prevent the degradation of the luminescent materials in the light-emitting device and improve The phenomenon of color separation. In addition, these black conductive materials are generally non-metallic conductive materials, which have good dispersion and are not easy to agglomerate, which is beneficial to display.

In a specific embodiment, the first conductive material is dispersed in the optical glue 40 . The case where the first conductive material is dispersed in the organic cover 30 is the same and will not be described again. The material of the polymer layer is polymethacrylic resin, and the black conductive material is carbon nanotubes. Specifically, they are single-walled carbon nanotubes. Of course, multi-walled carbon nanotubes can also be used in this application. The optical glue 40 is made with a mass ratio of carbon nanotubes to alkoxyalkyl acrylate greater than or equal to 0.1:100 and less than or equal to 5:100. Due to excessively long carbon nanotube tubes, dispersion may be reduced. The tube length of the carbon nanotubes used in this application is greater than 0 micron and less than 1 micron. Preferably, the tube length is less than 200 nanometers. More preferably, the tube length ranges from 50 nanometers to 200 nanometers (including 50 nanometers and 200 nanometers, the same below) . The diameter of the carbon nanotube ranges from 1 nanometer to 2 nanometers, preferably from 0.8 nanometers to 1.2 nanometers, and more preferably from 1 nanometer. The dielectric constant of the optical glue 40 thus prepared at 1 kHz is greater than or equal to 3.2 Far/meter (abbreviated as: 3.2 (1kHz) Far/meter). Preferably, it can reach more than 12 Far/meter. The dielectric properties get promoted. Enter In one step, its visible light transmittance is greater than or equal to 80%, and its ultraviolet light transmittance is less than or equal to 40%.

The touch display device 100 also includes a flat layer 60 . The flat layer 60 is located between the color filter and the optical glue 40 and covers the color filter layer 50 . The flat layer 60 can be made of organic resin, including but not limited to acrylic resin, epoxy resin, silicone resin, polydimethylsiloxane (PDMS), hexamethyldisiloxane (hexamethyldisiloxane, HMDSO) etc.

The second conductive material is dispersed in at least one of the planar layer 60, the color filter 51, and the black matrix 52. The materials of the planar layer 60, the color filter 51, and the black matrix 52 in the present application can be selected from conventional materials. The second conductive material is similar to the first conductive material, and can also be selected from at least one of metal particles, carbon particles, carbon nanotubes, and graphene. It should be noted that the second conductive material can be the same as or different from the first conductive material.

By adding a second conductive material to at least one of the flat layer 60 , the color filter 51 , and the black matrix 52 , the dielectric constant of the flat layer 60 , the color filter 51 , or the black matrix 52 can also be increased, thereby improving the touch module 20 sensitivity and signal-to-noise ratio.

Please refer to FIG. 3 , another embodiment of the present application provides a touch display device 100 . The touch display device 100 includes an organic light-emitting display module 10 , a touch module 20 , an organic cover 30 , a polarizer 70 , a first optical glue 41 and a second optical glue 42 . The touch module 20 is disposed on the light emitting side of the organic light emitting display module 10 . The organic cover 30 is disposed on the side of the touch module 20 away from the organic light-emitting display module 10 . The polarizer 70 is disposed between the touch module 20 and the organic cover 30 . The first optical glue 41 is located between the polarizer 70 and the touch module 20 . The second optical glue 42 is located between the polarizer 70 and the organic cover 30 . Wherein, the first conductive material is dispersed in the first optical glue 41 and/or the second optical glue 42 .

The difference between the embodiment of FIG. 3 and the embodiment of FIG. 1 is that the touch display device 100 includes a polarizer 70 . And the optical glue 40 includes a first optical glue 41 and a second optical glue 42 . For the structures of the first optical glue 41 and the second optical glue 42 in which the first conductive material is dispersed, reference can be made to the embodiment of FIG. 1 , and the description is omitted again.

Referring to FIG. 4 , the polarizer 70 includes a pressure-sensitive adhesive 71 (Pressure Sensitive Adhesive, PSA) layer, a first protective layer 72 , a polarizing structural layer 73 and a second protective layer 74 that are stacked in sequence. The material of the first protective layer 72 and the second protective layer 74 is triacetyl cellulose (TAC). polarizing junction The structural layer 73 includes a stacked linear polarizing film and a retardation layer (not shown). The linear polarizing film is the main component of the polarizer 70 , which determines the polarization performance and transmittance of the polarizer 70 , and also affects the color tone and optical durability of the polarizer 70 . The material of the linearly polarizing film can be polyvinyl alcohol, etc., for example, the linearly polarizing film can be formed by dyeing and stretching a polyvinyl alcohol film. When the polarizer 70 is applied to a display panel, light will be refracted multiple times after passing through each functional layer of the display panel, causing light interference, thereby affecting the display effect. Therefore, it is generally necessary to introduce a phase difference layer for optical compensation to reduce the impact of light interference on the display color.

Optionally, a third conductive material is dispersed in the pressure-sensitive adhesive 71 . The third conductive material is similar to the first conductive material, and may also be selected from at least one of metal particles, carbon particles, carbon nanotubes and graphene. By dispersing the third conductive material in the pressure-sensitive adhesive 71 , the dielectric constant of the pressure-sensitive adhesive 71 can also be increased, thereby further improving the sensitivity and signal-to-noise ratio of the touch module 20 . It should be noted that the third conductive material and the first conductive material may be the same or different. When the first conductive material, the second conductive material and the third conductive material exist at the same time, the materials of the three may be the same or different.

It should be noted that in other embodiments of the present application, conductive materials may be added only to the pressure-sensitive adhesive 71 without adding conductive materials to the first optical adhesive 41 and/or the second optical adhesive 42 .

Please refer to Figure 5. This application also provides a manufacturing method of a touch display device, which includes the following steps:

101: Provide an organic light emitting display module;

102: Provide a touch module, and set the touch module on the light exit side of the organic light-emitting display module;

103: providing an optical adhesive, and disposing the optical adhesive on a side of the touch module away from the organic light emitting display module; and

104: Provide an organic cover plate, and set the organic cover plate on the side of the optical glue away from the touch module;

Please refer to Figure 6, step 102 or step 104 includes:

201: Mixing monomers, initiators and solvents;

202: Polymerize monomers to form linear polymers;

203: Pause the reaction, add the first conductive material to the linear polymer, and disperse the first conductive material in the linear polymer;

204: Add a crosslinking agent to the linear polymer to disperse the first conductive material in the linear polymer. reacting to transform into a polymer having a cross-linked network structure; and

205: Coat the polymer with a cross-linked network structure on the substrate, and obtain a cover plate or optical glue after drying.

Below, several specific examples are used to illustrate the manufacturing steps of the optical glue added with the first conductive material of the present application. The manufacturing steps of the organic cover plate added with the first conductive material are similar and will not be described again.

Example 1

Using alkoxyalkyl acrylate (2MEA) as the monomer for preparing optical glue, ethyl acetate as the solvent, and 2,2-azobisisobutyronitrile as the initiator, free radical polymerization occurs at a certain temperature. The reaction is suspended until a set molecular weight is obtained, such as 500,000, and a linear polymer is obtained. A certain amount of carbon nanotubes is added to the linear polymer. The diameter of the carbon nanotubes is about 1 nm and the length of the tube is about 200 nm. When alkoxyalkyl acrylate is used as 100 parts by mass, the carbon nanotubes are 0.1 parts by mass. To make the added carbon nanotubes evenly dispersed in the reaction product, vigorous stirring, combined with ultrasonic dispersion, and appropriate addition of dispersant diisocyanate can be used. When the dispersion is complete, the cross-linking agent N,N-methylenebisacrylamide is added to transform the linear polymer into a polymer with a cross-linked network structure. The cross-linked product is coated on a substrate (such as a release film), and then undergoes drying and aging processes to obtain an optical glue with a thickness of 100 microns. The dielectric constant and visible light transmission of the obtained optical glue are measured. rate and transmittance of ultraviolet light (wavelength approximately 340 nanometers).

Example 2

Alkoxyalkyl acrylate (2MEA) is used as the monomer for preparing optical glue, ethyl acetate is used as the solvent, and 2,2-azobisisobutyronitrile is used as the initiator. A free radical polymerization reaction occurs at a certain temperature. The reaction is suspended until a set molecular weight is obtained, such as 500,000, and a linear polymer is obtained. A certain amount of carbon nanotubes is added to the linear polymer. The diameter of the carbon nanotubes is about 1 nm and the length of the tube is about 200 nm. When alkoxyalkyl acrylate is 100 parts by mass, the carbon nanotubes are 0.2 parts by mass. To make the added carbon nanotubes evenly dispersed in the reaction product, vigorous stirring, combined with ultrasonic dispersion, and appropriate addition of dispersant diisocyanate can be used. When the dispersion is complete, the cross-linking agent N,N-methylenebisacrylamide is added to transform the linear polymer into a polymer with a cross-linked network structure. The cross-linked product is coated on a substrate (such as a release film), and then undergoes drying and aging processes to obtain an optical glue with a thickness of 100 microns. The dielectric constant and visible light transmission of the obtained optical glue are measured. rate and ultraviolet light (wavelength approximately 340 nanometers) transmittance.

Example 3

Using alkoxyalkyl acrylate (2MEA) as the monomer for preparing optical glue, ethyl acetate as the solvent, and 2,2-azobisisobutyronitrile as the initiator, free radical polymerization occurs at a certain temperature. The reaction is suspended until a set molecular weight is obtained, such as 500,000, and a linear polymer is obtained. A certain amount of carbon nanotubes is added to the linear polymer. The diameter of the carbon nanotubes is about 1 nm and the length of the tube is about 200 nm. When alkoxyalkyl acrylate is 100 parts by mass, the carbon nanotubes are 0.5 parts by mass. To make the added carbon nanotubes evenly dispersed in the reaction product, vigorous stirring, combined with ultrasonic dispersion, and appropriate addition of dispersant diisocyanate can be used. When the dispersion is complete, the cross-linking agent N,N-methylenebisacrylamide is added to transform the linear polymer into a polymer with a cross-linked network structure. The cross-linked product is coated on a substrate (such as a release film), and then undergoes drying and aging processes to obtain an optical glue with a thickness of 100 microns. The dielectric constant and visible light transmission of the obtained optical glue are measured. rate and transmittance of ultraviolet light (wavelength approximately 340 nanometers).

Example 4

Using alkoxyalkyl acrylate (2MEA) as the monomer for preparing optical glue, ethyl acetate as the solvent, and 2,2-azobisisobutyronitrile as the initiator, free radical polymerization occurs at a certain temperature. The reaction is suspended until a set molecular weight is obtained, such as 500,000, and a linear polymer is obtained. A certain amount of carbon nanotubes is added to the linear polymer. The diameter of the carbon nanotubes is about 1 nm and the length of the carbon nanotubes is about 200 nm. When alkoxyalkyl acrylate is 100 parts by mass, the carbon nanotubes are 1 part by mass. To make the added carbon nanotubes evenly dispersed in the reaction product, vigorous stirring, combined with ultrasonic dispersion, and appropriate addition of dispersant diisocyanate can be used. When the dispersion is complete, the cross-linking agent N,N-methylenebisacrylamide is added to transform the linear polymer into a polymer with a cross-linked network structure. The cross-linked product is coated on a substrate (such as a release film), and then undergoes drying and aging processes to obtain an optical glue with a thickness of 100 microns. The dielectric constant and visible light transmission of the obtained optical glue are measured. rate and transmittance of ultraviolet light (wavelength approximately 340 nanometers).

The performance test results of Examples 1 to 4 are shown in Table 1 below:

Compared with the dielectric constant of the organic cover plate in the prior art which is lower than 3, this application increases the dielectric constant of the organic cover plate and/or optical glue to above 3 by adding conductive particles to the organic material. electrical constant, thereby improving the touch sensitivity of the touch display device. Moreover, after adding conductive particles, the visible light transmittance of the organic cover plate and/or optical glue can still be maintained above 85%, and the light transmittance in the UV band remains below 40%, proving that the addition of conductive particles will not affect display effect.

The above provides a detailed introduction to the implementation of the present application. This article uses specific examples to illustrate the principles and implementations of the present application. The above description of the implementation is only used to help understand the present application. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present application. In summary, the content of this description should not be understood as a limitation of the present application.

Claims

A touch display device, including:

Organic light-emitting display module;

A touch module is provided on the light-emitting side of the organic light-emitting display module;

An organic cover plate is provided on the side of the touch module away from the organic light-emitting display module; and

Optical glue, disposed between the touch module and the organic cover;

Wherein, the first conductive material is dispersed in the organic cover plate and/or the optical glue.
The touch display device according to claim 1, wherein the touch display device further comprises a color filter layer, the color filter layer is arranged between the touch module and the optical adhesive, the color filter layer comprises a plurality of spaced color filters and a black matrix arranged between two adjacent color filters, and the first conductive material comprises a black conductive material.
The touch display device according to claim 2, wherein the black conductive material is carbon nanotube, the tube length of the carbon nanotube is greater than 0 microns and less than 1 micron, and the diameter range of the carbon nanotubes is 1nm to 2nm.
The touch display device according to claim 2, wherein the black conductive material is a carbon nanotube, the length of the carbon nanotube ranges from 50 nanometers to 200 nanometers, and the diameter of the carbon nanotube ranges from 50 nanometers to 200 nanometers. 0.8nm to 1.2nm.
The touch display device according to claim 1, wherein the organic cover plate or the optical adhesive dispersed with the first conductive material has a dielectric constant greater than or equal to 3.2 F/m at 1 kHz, a visible light transmittance greater than or equal to 80%, and an ultraviolet light transmittance less than or equal to 40%.
The touch display device according to claim 5, wherein the organic cover plate or the optical glue includes a polymer layer and the first conductive material dispersed in the polymer layer, and the organic cover plate Or the optical glue is made with a mass ratio of the first conductive material to the monomer of the polymer layer being greater than or equal to 0.1:100 and less than or equal to 5:100.
The touch display device according to claim 1, wherein the dielectric constant of the organic cover plate or the optical glue dispersed with the first conductive material at 1 kHz is greater than or equal to 12 Farad/meter.
The touch display device according to claim 1, wherein the organic cover or the optical adhesive comprises a polymer layer and the first conductive material dispersed in the polymer layer, the polymer layer The material includes at least one of acrylic resin, silicone, polyurethane glue, and epoxy resin, the polymer layer has a cross-linked network structure, the organic cover or the optical glue further includes a dispersant and a cross-linking agent, and the first conductive material is selected from at least one of metal particles, carbon particles, carbon nanotubes and graphene.
The touch display device according to claim 2, wherein the touch display device further includes a flat layer, the flat layer is located between the color filter and the optical glue and covers the color filter layer, so A second conductive material is dispersed in at least one of the flat layer, the color filter, and the black matrix.
The touch display device of claim 1, wherein the touch display device further includes a polarizer, the polarizer is disposed between the touch module and the organic cover, and the optical adhesive It includes a first optical glue and a second optical glue. The first optical glue is located between the polarizer and the touch module. The second optical glue is located between the polarizer and the organic cover. During the period, the first conductive material is dispersed in the first optical glue and/or the second optical glue.
The touch display device of claim 10, wherein the polarizer includes pressure-sensitive adhesive, and a third conductive material is dispersed in the pressure-sensitive adhesive.
A touch display device, including:

Organic light-emitting display module;

A touch module is provided on the light-emitting side of the organic light-emitting display module;

An organic cover plate is provided on the side of the touch module away from the organic light-emitting display module;

A polarizer is provided between the touch module and the organic cover;

Wherein, the polarizer includes a pressure-sensitive adhesive, in which a first conductive material is dispersed.
The touch display device according to claim 12, wherein the touch display device further includes an optical glue disposed between the touch module and the organic cover plate, and the organic cover plate and/or A second conductive material is dispersed in the optical glue.
The touch display device of claim 13, wherein the second conductive material includes carbon nanotubes, the length of the carbon nanotubes is greater than 0 microns and less than 1 micron, and the diameter of the carbon nanotubes ranges from is 1 nm to 2 nm.
The touch display device according to claim 13, wherein the second conductive material is a carbon nanotube, the length of the carbon nanotube ranges from 50 nanometers to 200 nanometers, and the diameter of the carbon nanotube ranges from 50 nanometers to 200 nanometers. is 0.8 nm to 1.2 nm.
The touch display device according to claim 13, wherein the dielectric constant of the organic cover plate or the optical glue dispersed with the second conductive material at 1 kHz is greater than or equal to 3.2 Far/meter, and the dielectric constant of the visible light The transmittance is greater than or equal to 80%, and the transmittance of ultraviolet light is less than or equal to 40%.
The touch display device according to claim 16, wherein the organic cover plate or the optical glue includes a polymer layer and the second conductive material dispersed in the polymer layer, and the organic cover plate Or the optical glue is made with a mass ratio of the second conductive material to the monomer of the polymer layer being greater than or equal to 0.1:100 and less than or equal to 5:100.
The touch display device of claim 13, wherein the organic cover plate or the optical glue includes a polymer layer and the second conductive material dispersed in the polymer layer, and the polymer layer The material includes at least one of acrylic resin, silica gel, polyurethane glue, and epoxy resin, the polymer layer has a cross-linked network structure, the organic cover plate or the optical glue also includes a dispersant and a cross-linking agent, The second conductive material is selected from at least one of metal particles, carbon particles, carbon nanotubes and graphene.
The touch display device of claim 13, wherein the optical glue includes a first optical glue and a second optical glue, the first optical glue is located between the polarizer and the touch module, The second optical glue is located between the polarizer and the organic cover plate, and the second conductive material is dispersed in the first optical glue and/or the second optical glue.
A method of manufacturing a touch display device, including the following steps:

Provide an organic light-emitting display module;

Providing a touch module, which is arranged on the light-emitting side of the organic light-emitting display module;

Provide an optical glue, and set the optical glue on the side of the touch module away from the organic light-emitting display module; and

Provide an organic cover plate, and set the organic cover plate on the side of the optical glue away from the touch module;

Wherein, the step of providing an optical glue or providing an organic cover plate includes:

Mix monomers, initiators and solvents;

causing the monomer to polymerize to form a linear polymer;

Pause the reaction, add a first conductive material to the linear polymer, and disperse the first conductive material in the linear polymer;

A crosslinking agent is added to the linear polymer to make the linear polymer dispersed with the first conductive material The polymer reacts to transform into a polymer having a cross-linked network structure; and

The polymer with a cross-linked network structure is coated on a substrate, and after drying, the cover plate or the optical glue is obtained.