CN115494978A

CN115494978A - Touch display device and manufacturing method thereof

Info

Publication number: CN115494978A
Application number: CN202211162333.5A
Authority: CN
Inventors: 许峰
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2022-12-20
Also published as: WO2024060496A1

Abstract

The application provides a touch display device and a manufacturing method thereof. The touch module is arranged on the light emitting side of the organic light emitting display module. The organic cover plate is arranged on one side of the touch module, which is far away from the organic light-emitting display module. The optical cement is arranged between the touch module and the organic cover plate. The organic cover plate and/or the optical cement have a first conductive material dispersed therein. The touch display device can improve touch sensitivity and signal to noise ratio.

Description

Touch display device and manufacturing method thereof

Technical Field

The present disclosure relates to touch display technologies, and particularly to a touch display device and a manufacturing method thereof.

Background

Organic light-Emitting Diode (OLED) flexible devices are considered as a new generation of display technology. The OLED flexible device can be used for manufacturing a display module with fixed curvature and even repeated folding. With the development of technology, four-curved screens are becoming mainstream. The four-curved-surface glass cover plate is difficult to process and high in cost, and the curved surface part is easily damaged under the external impact. The feasibility of replacing the glass cover plate with the organic cover plate is as follows: first, the weight of the organic cover plate is much less than that of the glass cover plate, and the density of the organic cover plate is generally less than 1.5g/cm ³ And the density of the glass is more than 2.5g/cm ³ (ii) a Secondly, the organic cover plate itself is less prone to fracture damage, i.e.The product can not be broken under the strong impact of the outside, and the durability and the safety of the product are improved; finally, the organic cover plate is easy to mold and process, and is particularly remarkable in the process of processing the 3D cover plate, particularly the softening point of the organic material is low, so that no matter a hot bending or injection molding mode is used, the temperature is not required to be too high in the process, the temperature can be generally controlled within 150 ℃, and the hot bending molding process of the glass can be realized only by using the temperature of more than 500 ℃.

Although the organic cover plate has many advantages, the organic cover plate has a problem of insufficient mechanical strength. Whatever organic material and combination thereof, for example, methyl methacrylate (PMMA) or Polycarbonate (PC) or a combination of PMMA and PC, is used, mechanical strength similar to that of glass cannot be achieved. Because organic polymers generally have an elastic modulus of less than 5GPa, while glass tends to have an elastic modulus in excess of 70GPa. In order to increase the strength of the organic sheathing, it is inevitably necessary to increase the thickness of the sheathing. For example, a commonly used glass cover plate uses a thickness of around 550um, while an organic cover plate often requires 800um or even over 1000 um. In this way, in the display device in which the touch module is provided below the cover plate, the sensitivity of touch is reduced due to the increase in thickness of the cover plate. Therefore, a touch display device capable of improving touch sensitivity and signal-to-noise ratio is needed.

Disclosure of Invention

The application aims to provide a touch display device capable of improving touch sensitivity and signal-to-noise ratio.

The application provides a touch display device, it includes:

an organic light emitting display module;

the touch module is arranged on the light emitting side of the organic light emitting display module;

the organic cover plate is arranged on one side, away from the organic light-emitting display module, of the touch module; and

the optical adhesive is arranged between the touch module and the organic cover plate;

wherein a first conductive material is dispersed in the organic cover plate and/or the optical cement.

Optionally, in some embodiments, the touch display device further includes a color film layer, the color film layer is disposed between the touch module and the optical adhesive, the color film layer includes a plurality of color films disposed at intervals and a black matrix disposed between two adjacent color films, and the first conductive material includes a black conductive material.

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

Optionally, in some embodiments, the dielectric constant of the organic cover plate or the optical adhesive dispersed with the first conductive material at 1kHz is greater than or equal to 3.2 f/m, 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 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 in a mass ratio of the first conductive material to a monomer of the polymer layer is greater than or equal to 0.1.

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

Optionally, in some embodiments, the touch display device further includes a planarization layer, the planarization layer is located between the color film and the optical adhesive and covers the color film layer, and a second conductive material is dispersed in at least one of the planarization layer, the color film, 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 plate, 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 first conductive material is dispersed in the first optical glue and/or the second optical glue.

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

The application provides a touch display device, it includes:

an organic light emitting display module;

the organic cover plate is arranged on one side, away from the organic light-emitting display module, of the touch module;

the polaroid is arranged between the touch module and the organic cover plate;

the polaroid comprises a pressure-sensitive adhesive, wherein a first conductive material is dispersed in the pressure-sensitive adhesive.

The application provides a manufacturing method of a touch display device, which comprises the following steps:

providing an organic light emitting display module;

providing a touch module, and arranging the touch module on the light emergent side of the organic light-emitting display module;

providing an optical adhesive, and arranging the optical adhesive on one side of the touch module, which is far away from the organic light-emitting display module; and

providing an organic cover plate, and arranging the organic cover plate on one side of the optical cement, which is far away from the touch module;

wherein, the step of providing an optical cement or providing an organic cover plate comprises:

mixing a monomer, an initiator and a solvent;

polymerizing the monomers to form a linear polymer;

suspending the reaction, adding a first conductive material to the linear polymer, and dispersing the first conductive material in the linear polymer;

adding a cross-linking agent into the linear polymer to enable the linear polymer dispersed with the first conductive material to react and convert into a polymer with a cross-linked network structure; and

and coating the polymer with the cross-linked network structure on a substrate, and drying to obtain the cover plate or the optical cement.

According to the application, the first conductive material is added when the organic cover plate and/or the optical cement are prepared, so that the overall dielectric property of the organic material is rapidly improved, and the organic cover plate and/or the optical cement with high dielectric constant are obtained. According to a capacitance calculation formula: c = ε _r ε ₀ A/d, wherein C represents capacitance,. Epsilon _r Representing the relative permittivity, ε, of the dielectric material between two parallel plates of a capacitor ₀ Denotes the absolute dielectric constant in vacuum, A denotes the relative area between two parallel plates of the capacitor, d denotes the distance of the capacitor, when ε ₀ A and d are fixed,. Epsilon _r When the capacitance C is increased, the capacitance variation received by the touch module is increased, so that the sensitivity and the signal-to-noise ratio of the touch module are improved.

Drawings

In order to more clearly illustrate the technical solutions in the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without 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 shown in 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 flowchart of a method for manufacturing a touch display device according to an embodiment of the present disclosure.

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

Detailed Description

The technical solution in the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments in the present application without making any creative effort belong to 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 the first and second features directly, or may comprise the first and second features not being directly connected but being in contact with each other by means of further features between them. 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. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features.

For a capacitive touch screen, whether self-capacitance or mutual capacitance, the touch screen is required to have higher sensitivity, and the dielectric properties of materials need to be improved for higher sensitivity. Specifically, C = epsilon _r ε ₀ A/d, C represent capacitance,. Epsilon _r Representing the relative permittivity, ε, of the dielectric material between two parallel plates of a capacitor ₀ Representing the absolute dielectric constant of the vacuum, a represents the relative area between two parallel plates of the capacitor, and d represents the capacitor distance. The larger the capacitance C, the higher capacitance change, the higher gain and the higher signal-to-noise ratio that can be obtained when a finger touches the capacitive touch screen. However, in order to increase the strength of the cover plate, the thickness of the material has to be increased, assuming that the thickness of the glass cover plate is 500um and the thickness of the organic cover plate is 1000um, the relative dielectric constant of the glass is usually greater than 7, and is assumed to be 7.5, while the relative dielectric constant of the material of the organic cover plate is generally smaller, typically PMMA, is usually smaller than 3, and is assumed to be 2.5. Thus, according to the formula, after the organic cover plate is used, the variation of the capacitor C in touch is only 1/6 of that of the glass cover plate, and the sensitivity and the signal-to-noise ratio are greatly reduced. As a solution, although some high dielectric organic materials can be used to make the cover plate, other problems are inevitably introduced, for example, polyvinylidene fluoride (PVDF) is used as the material of the organic cover plate, but new problems are generated in terms of performance, cost and processing technology.

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 adhesive. The touch module is arranged on the light emitting side of the organic light emitting display module. The organic cover plate is arranged on one side of the touch module, which is far away from the organic light-emitting display module. The optical cement is arranged between the touch module and the organic cover plate. The organic cover plate and/or the optical cement have a first conductive material dispersed therein.

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

Referring to fig. 1, a touch display device 100 according to an embodiment of the present disclosure is a touch display device 100 having a depolarizing layer (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 adhesive 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 a side of the touch module 20 away from the organic light emitting display module 10. The optical adhesive 40 is disposed between the touch module 20 and the organic cover 30. The organic cover plate 30 and/or the optical cement 40 have a first conductive material dispersed therein.

The organic light emitting display module 10 is used for displaying images. The Organic Light emitting display module 10 may be an Active Matrix Organic Light-emitting Diode (AMOLED) display module or a Passive Matrix Organic Light-emitting Diode (PMOLED) display module according to a driving type. Specifically, the organic light emitting display module 10 includes an array substrate (also referred to as 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) disposed on the substrate. Taking AMOLED as an example, the pixel driving circuit may be a pixel driving circuit commonly used in the art, such as 2t1C,3t1C,5t1C, or 7T 1C. The light emitting layer 12 includes a pixel defining layer 121 and a light emitting device 122. An opening 121a is opened in the pixel defining layer 121, and the light emitting device 122 is disposed in the opening 121 a. The light emitting device 122 may be a Top-emitting OLED (Top-emitting OLED) device or a Bottom-emitting OLED (Bottom-emitting OLED). Alternatively, the light emitting device 122 may include an anode, a cathode, and a hole injection layer, a hole transport layer, an electron injection layer (none shown), and the like, which are sequentially disposed between and on the anode. The organic light emitting display module 10 further 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 comprises at least one inorganic layer and at least one organic layer which are alternately stacked. The inorganic layer may be an inorganic material selected from alumina, silicon oxide, silicon nitride, silicon oxynitride, silicon carbide, titanium oxide, zirconium oxide, zinc oxide, and the like. The organic layer is an organic material selected from epoxy resin, polyimide (PI), polyethylene terephthalate (PET), polycarbonate (PC), polyethylene (PE), polyacrylate (PA), and the like.

The touch module 20 is used for detecting a touch action. The touch module 20 may be a self-contained touch module or a mutual-contained touch module. Referring to fig. 2, taking the mutually-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 disposed in the same layer, or may be disposed in different layers. In some embodiments, the plurality of transmit electrodes TX are disposed in the same layer as the plurality of receive electrodes RX. The plurality of transmission electrodes TX are arranged in a plurality of rows in the first direction X, and the transmission electrodes TX of the same row are connected to each other, and the plurality of rows of transmission electrodes TX are arranged in columns in the second direction Y crossing the first direction X. The plurality of receiving electrodes RX are arranged in a plurality of columns along the second direction Y, and the receiving electrodes RX of the same column are connected to each other, and the plurality of rows of receiving electrodes RX are arranged in a column along the first direction X. Although not shown, the receiving electrodes RX in the same column are connected to the lower trace. Optionally, the first direction X is perpendicular to the second direction Y. And references herein to "rows" and "columns" do not mean that the "rows" and "columns are necessarily perpendicular to each other, nor do they define the direction in which they extend. 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 by the receiving electrode RX is proportional to the mutual capacitance between the two electrodes, and when a touch operation occurs between the transmitting electrode TX and the receiving electrode RX, the mutual capacitance decreases, and therefore, the charge received by the receiving electrode RX also decreases. Thereby detecting whether a touch state exists by detecting the charge on the receiving electrode RX.

The organic cover 30 covers the touch module 20, and is used for protecting the organic light emitting display module 10 and the touch module 20 and providing a touch interface. In some embodiments, the organic cover sheet 30 is a flexible, light-transmissive cover sheet. Optionally, the organic cover plate 30 includes a polymer layer and a first conductive material dispersed in the polymer layer. The material of the polymer layer may be selected from light-transmitting organic materials such as polymethyl methacrylate (PMMA), polycarbonate (PC), and Polyimide (PI). These resin materials may be used alone or in combination to form a polymer layer. The first conductive material is selected from at least one of metal particles, carbon nanotubes, and graphene. The metal particles may be copper, iron, aluminum, silver, etc. Alternatively, the polymer layer has a cross-linked network structure, and the organic cover sheet 30 further includes a dispersant and a cross-linking agent. The dispersant is used to disperse the first conductive material in the polymer layer. The crosslinking agent serves to cause the polymer layer to form a crosslinked network structure.

The optical cement 40 is used for bonding the organic cover plate 30 and a film layer below the organic cover plate 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 rubber, urethane rubber, and epoxy resin. These resin materials may be used alone or in combination to form a polymer layer. The acrylic resin may be specifically a polymethacrylic resin. The first conductive material is selected from at least one of metal particles, carbon nanotubes, and graphene. The metal particles may be copper, iron, aluminum, silver, etc. Optionally, the polymer layer has a cross-linked network structure, and the optical glue 40 further comprises a dispersant and a cross-linking agent. The dispersant is used to disperse the first conductive material in the polymer layer. The crosslinking agent serves to cause the polymer layer to form a crosslinked network structure.

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

The "percolation theory" is the theoretical explanation of the rule by which the dielectric properties of an insulator-conductor dielectric composite change with the amount of conductive filler loading to date is best. For a classical two-phase composite system, as the filling amount of the filler is changed, the phase distribution of the filler undergoes a qualitative change from dispersion to a seepage cluster structure, and a very irregular continuous phase and a phase interface thereof formed in the change process can be explained and analyzed only by means of seepage theory. The conductor filler is added into the organic polymer, and when the organic polymer is filled in a small amount, the conductor filler is randomly arranged in the matrix. As the amount of filler doping increases, the spacing between the fillers becomes smaller and agglomeration begins to occur in the matrix. When the doping amount is increased to a certain amount, the conductor fillers are mutually connected to form a conductive network structure to form an electron tunneling effect; accordingly, the conductivity of the material increases by orders of magnitude, transitioning from an insulator to a conductor. When this transition is experienced, the volume content of the conductor in the composite system is referred to as the percolation threshold fc. It was found that near the percolation threshold fc, the dielectric constant of the material also changes abruptly in a non-linear manner. As the volume fraction of the conductor approaches the percolation threshold fc gradually from below, the dielectric constant of the material increases rapidly. That is, for a composite system composed of conductive particles dispersed in a dielectric matrix, the "percolation effect" of the dielectric properties of the composite system, which is a function of the content of conductive particles, can be used to change the conductivity of the composite and greatly increase the dielectric constant.

Based on the percolation theory, when a certain amount of conductive substance is doped into the dielectric material, the dielectric constant of the dielectric material will rise sharply, and the change amplitude can reach several orders of magnitude. By utilizing the principle, the dielectric property of the whole organic material is rapidly increased by adding the first conductive material when the organic cover plate and/or the optical cement are prepared, so that the organic cover plate and/or the optical cement with high dielectric constant is obtained. According to a capacitance calculation formula: c = ε _r ε ₀ And A/d. When epsilon ₀ A and d are fixed,. Epsilon _r When the capacitance C is increased, the capacitance variation received by the touch module is increased, so that the sensitivity and the signal-to-noise ratio of the touch module are improved. It should be noted that the term "high dielectric constant" in this application is only used with respect to the conventional organic cover plate or optical glue, and does not mean that the dielectric constant is as high as a specific range.

The first conductive material may be dispersed in one of the organic cover 30 and the optical paste 40. When the first conductive material is dispersed in both the organic cover plate 30 and the optical adhesive 40, the first conductive material dispersed in the organic cover plate 30 and the optical adhesive 40 may be the same or different in type and mass ratio. The kind and mass ratio of the first conductive material may be selected according to the properties of the organic cover plate 30 and the optical paste 40. Moreover, since the thicknesses of the organic cover plate 30 and the optical paste 40 are sufficiently large, for example, the thickness of the optical paste 40 is generally 100 to 200 micrometers, the effect of increasing the dielectric constant is greater when the first conductive material is added to the organic cover plate 30 and the optical paste 40 than when the first conductive material is added to other components. And because the material used by the optical cement 40, such as polymethyl methacrylate resin, has lower modulus and viscosity, the material has stronger fluidity, and the first conductive material has better dispersibility in the optical cement 40, thereby ensuring the display performance. It should be noted that the thicknesses of the organic cover plate 30 and the optical cement 40 do not affect the dielectric constant, and basically do not affect the transmittance.

Optionally, the dielectric constant of the organic cover plate 30 or the optical cement 40 dispersed with the first conductive material at 1kHz is greater than or equal to 3.2 methods/meter, preferably greater than or equal to 12 methods/meter; a visible light transmittance of 80% or more, preferably 85% or more; and has a UV transmittance of 40% or less, preferably 30% or less. The increase of the dielectric constant of the organic cover plate 30 or the optical adhesive 40 added with the first conductive material is beneficial to the increase of the touch sensitivity. As a touch display device, it is desirable that the light transmittance is as high as possible and the transmittance of ultraviolet light is as low as possible to reduce the influence of ultraviolet light on display. In the present application, "transmittance of ultraviolet light" refers to transmittance of light in the Ultraviolet (UV) band, for example, light having a wavelength of about 340 nm.

When the mass ratio of the first conductive material is too large, the material loses dielectric properties, and when the mass ratio of the first conductive material is too small, the improvement of the dielectric properties is not obvious. Optionally, the organic cover plate 30 or the optical adhesive 40 is made of a first conductive material and a monomer of the polymer layer, wherein the mass ratio of the first conductive material to the monomer is greater than or equal to 0.1. More preferably, the mass ratio of the first conductive material to the monomer of the polymer layer ranges from 0.5. The polymer layer is mainly composed of a polymer, and the monomer of the polymer layer means a monomer of the polymer constituting the polymer layer. Specifically, the monomer is a generic term for small molecules capable of polymerizing with the same or other molecules, and is a simple compound capable of synthesizing a high molecular compound by polymerization reaction, polycondensation reaction or the like, and is a low molecular material used for synthesizing a polymer. The monomers of the polymer layer are generally unsaturated, cyclic or contain two or moreA functional group of low molecular weight compound. For example, vinyl chloride CH ₂ The 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 monomers for synthesizing polyethylene, polypropylene, polyvinyl chloride, and polystyrene, and are structural units constituting these four kinds of high molecular compounds. Specifically, the polymer layer is made of polymethacrylic resin, the monomer of the polymer layer is alkoxyalkyl acrylate, and the first conductive material is carbon nanotubes, wherein the mass ratio of the carbon nanotubes to the alkoxyalkyl acrylate ranges from 0.1 to 5.

The touch display device 100 further includes a color film layer 50, and the color film layer 50 is disposed between the touch module 20 and the optical adhesive 40. The color film layer 50 is used to function as a substitute for a polarizer. The color film layer 50 includes a plurality of color films 51 disposed at intervals and a black matrix 52 disposed between two adjacent color films 51, and the first conductive material includes a black conductive material. The color films correspond to the light emitting devices one to one, and the pixel defining layer 121 is black. Specifically, the optical paste 40 includes a polymer layer and a black conductive material dispersed in the polymer layer. The black conductive material may be carbon particles, carbon nanotubes, graphene, or the like. In the POL-LESS display apparatus, the addition of the black conductive material brings other advantages, such as absorption of a part of ambient light, particularly ultraviolet light in the ambient light, thereby contributing to prevention of deterioration of the light emitting material in the light emitting device and improvement of the phenomenon of color separation. In addition, the black conductive materials are generally nonmetal conductive materials, have good dispersibility, are not easy to agglomerate and are beneficial to display.

In one particular embodiment, a first conductive material is dispersed in the optical glue 40. The organic cover plate 30 has the first conductive material dispersed therein, which will not be described in detail. The polymer layer is made of polymethyl methacrylate resin, and the black conductive material is a carbon nano tube. In particular single-walled carbon nanotubes, although multi-walled carbon nanotubes may also be used in the present application. The optical adhesive 40 is prepared by the mass ratio of the carbon nano tube to the alkoxyalkyl acrylate being greater than or equal to 0.1. Since the carbon nanotube tube is too long, the dispersibility may be degraded. The carbon nanotubes used herein have a tube length of more than 0 micron and less than 1 micron, preferably, a tube length of less than 200nm, and more preferably, a tube length ranging from 50 nm to 200nm (including 50 nm and 200nm, the same applies hereinafter). The diameter of the carbon nanotubes is in the range of 1nm to 2 nm, preferably 0.8 nm to 1.2 nm, and more preferably 1 nm. The dielectric constant of the optical cement 40 thus produced is not less than 3.2 Farad/m (abbreviated as 3.2 (1 kHz)) at 1kHz, preferably not less than 12 Farad/m, and the dielectric characteristics are improved. Further, the transmittance of visible light is 80% or more, and the transmittance of ultraviolet light is 40% or less.

The touch display device 100 further includes a planarization layer 60. The flat layer 60 is located between the color film and the optical adhesive 40 and covers the color film layer 50. The planarization layer 60 may be made of an organic resin including, but not limited to, acrylic resin, epoxy resin, silicone resin, polydimethylsiloxane (PDMS), hexamethyldisiloxane (HMDSO), and the like.

At least one of the planarization layer 60, the color filter 51, and the black matrix 52 has a second conductive material dispersed therein. The materials of the planarization layer 60, the color film 51 and the black matrix 52 in the present application may be selected from conventional materials. The second conductive material may also be selected from at least one of metal particles, carbon nanotubes, and graphene, similar to the first conductive material. The second conductive material may be the same as or different from the first conductive material.

By adding the second conductive material to at least one of the planarization layer 60, the color film 51 and the black matrix 52, the dielectric constant of the planarization layer 60, the color film 51 or the black matrix 52 can also be increased, so that the sensitivity and the signal-to-noise ratio of the touch module 20 are improved.

Referring 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 adhesive 41 and a second optical adhesive 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 a 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 adhesive 41 is located between the polarizer 70 and the touch module 20. The second optical adhesive 42 is located between the polarizer 70 and the organic cover plate 30. Wherein, the first conductive material is dispersed in the first optical glue 41 and/or the second optical glue 42.

The embodiment of fig. 3 differs from the embodiment of fig. 1 in that: the touch display device 100 includes a polarizer 70. And the optical paste 40 includes a first optical paste 41 and a second optical paste 42. The first optical glue 41 and the second optical glue 42 dispersed with the first conductive material may refer to the embodiment of fig. 1, and the description thereof is omitted again.

Referring to fig. 4, the polarizer 70 includes a Pressure Sensitive Adhesive (PSA) layer, a first protective layer 72, a polarizing structure layer 73, and a second protective layer 74, which are sequentially stacked. The material of the first protective layer 72 and the second protective layer 74 is Triacetylcellulose (TAC). The polarizing structure layer 73 includes a linear polarizing film and a phase difference layer (not shown) stacked. The linear polarizing film is a main component of the polarizer 70, and determines the polarization performance and transmittance of the polarizer 70, and also affects the color tone and optical durability of the polarizer 70. The linear polarizing film may be formed of polyvinyl alcohol, for example, by dyeing and stretching a polyvinyl alcohol film. When the polarizer 70 is applied to a display panel, light may be refracted many 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 to optically compensate the retardation layer, so as to reduce the influence of light interference on the display color.

Optionally, a third conductive material is dispersed in the pressure sensitive adhesive 71. The third conductive material may also be at least one selected from metal particles, carbon nanotubes, and graphene, similar to the first conductive material. The third conductive material is dispersed in the pressure-sensitive adhesive 71, so that the dielectric constant of the pressure-sensitive adhesive 71 can be improved, and the sensitivity and the signal-to-noise ratio of the touch module 20 are further improved. The third conductive material may be the same as or different from the first conductive material. In the case where the first conductive material, the second conductive material, and the third conductive material are present 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, the conductive material may be added only to the pressure-sensitive adhesive 71, and the conductive material is not added to the first optical adhesive 41 and/or the second optical adhesive 42.

Referring to fig. 5, the present application further provides a method for manufacturing a touch display device, which includes the following steps:

101: providing an organic light emitting display module;

102: providing a touch module, and arranging the touch module on the light emergent side of the organic light-emitting display module;

103: providing an optical adhesive, and arranging the optical adhesive on one side of the touch module, which is far away from the organic light-emitting display module; and

104: providing an organic cover plate, and arranging the organic cover plate on one side of the optical cement, which is far away from the touch module;

referring to fig. 6, step 102 or step 104 includes:

201: mixing a monomer, an initiator and a solvent;

202: polymerizing the monomers to form a linear polymer;

203: suspending the reaction, adding a first conductive material into the linear polymer, and dispersing the first conductive material in the linear polymer;

204: adding a cross-linking agent into the linear polymer to enable the linear polymer dispersed with the first conductive material to react and convert into a polymer with a cross-linked network structure; and

205: and coating the polymer with the cross-linked network structure on a substrate, and drying to obtain the cover plate or the optical cement.

Hereinafter, the steps of manufacturing the optical paste added with the first conductive material according to the present application will be described with reference to several embodiments. The steps of fabricating the organic cover plate with the first conductive material added are similar and will not be described in detail.

Example 1

Taking acrylic acid alkoxy alkyl ester (2 MEA) as a monomer for preparing optical glue, taking ethyl acetate as a solvent and 2,2-azodiisobutyronitrile as an initiator, carrying out free radical polymerization reaction at a certain temperature until a set molecular weight, such as 500000, is obtained, obtaining a linear polymer, and suspending the reaction. A certain amount of carbon nano tubes are added into the linear polymer, the tube diameter of the carbon nano tubes is about 1nm, the tube length is about 200nm, and when the acrylic acid alkoxy alkyl ester is 100 parts by mass, the carbon nano tubes are 0.1 part by mass. The added carbon nanotubes are uniformly dispersed in the reaction product by using a method of vigorous stirring in combination with ultrasonic dispersion, and a dispersant diisocyanate is appropriately added. When the dispersion is complete, adding a cross-linking agent N, N-methylene bisacrylamide to convert the linear polymer into a polymer with a cross-linked network structure. The crosslinked product is coated on a substrate (such as a release film), and then dried and aged to obtain an optical adhesive with a thickness of 100 microns, and the dielectric constant, the visible light transmittance and the ultraviolet light transmittance (with a wavelength of about 340 nm) of the obtained optical adhesive are measured.

Example 2

Taking acrylic acid alkoxy alkyl ester (2 MEA) as a monomer for preparing optical glue, taking ethyl acetate as a solvent and 2,2-azodiisobutyronitrile as an initiator, carrying out free radical polymerization reaction at a certain temperature until a set molecular weight, such as 500000, is obtained, obtaining a linear polymer, and suspending the reaction. A certain amount of carbon nano tubes are added into the linear polymer, the tube diameter of the carbon nano tubes is about 1nm, the tube length is about 200nm, and when the acrylic acid alkoxy alkyl ester is 100 parts by mass, the carbon nano tubes are 0.2 part by mass. The added carbon nanotubes are uniformly dispersed in the reaction product by using a method of vigorous stirring in combination with ultrasonic dispersion, and a dispersant diisocyanate is appropriately added. When the dispersion is complete, adding a cross-linking agent N, N-methylene-bisacrylamide to convert the linear polymer into a polymer with a cross-linked network structure. The crosslinked product is coated on a substrate (such as a release film), and then dried and aged to obtain an optical adhesive with a thickness of 100 microns, and the dielectric constant, the visible light transmittance and the ultraviolet light transmittance (with a wavelength of about 340 nm) of the obtained optical adhesive are measured.

Example 3

Taking acrylic acid alkoxy alkyl ester (2 MEA) as a monomer for preparing optical glue, taking ethyl acetate as a solvent and 2,2-azodiisobutyronitrile as an initiator, carrying out free radical polymerization reaction at a certain temperature until a set molecular weight, such as 500000, is obtained, obtaining a linear polymer, and suspending the reaction. A certain amount of carbon nano tubes are added into the linear polymer, the tube diameter of the carbon nano tubes is about 1nm, the tube length is about 200nm, and when the acrylic acid alkoxy alkyl ester is 100 parts by mass, the carbon nano tubes are 0.5 part by mass. The added carbon nanotubes are uniformly dispersed in the reaction product by using a method of vigorous stirring in combination with ultrasonic dispersion, and a dispersant diisocyanate is appropriately added. When the dispersion is complete, adding a cross-linking agent N, N-methylene bisacrylamide to convert the linear polymer into a polymer with a cross-linked network structure. The crosslinked product is coated on a substrate (such as a release film), and then dried and aged to obtain an optical adhesive with a thickness of 100 microns, and the dielectric constant, the visible light transmittance and the ultraviolet light transmittance (with a wavelength of about 340 nm) of the obtained optical adhesive are measured.

Example 4

Taking acrylic acid alkoxy alkyl ester (2 MEA) as a monomer for preparing optical glue, taking ethyl acetate as a solvent and 2,2-azodiisobutyronitrile as an initiator, carrying out free radical polymerization reaction at a certain temperature until a set molecular weight, such as 500000, is obtained, obtaining a linear polymer, and suspending the reaction. A certain amount of carbon nano tubes are added into the linear polymer, the tube diameter of the carbon nano tubes is about 1nm, the tube length of the carbon nano tubes is about 200nm, and when the acrylic acid alkoxy alkyl ester is 100 parts by mass, the carbon nano tubes are 1 part by mass. The added carbon nanotubes are uniformly dispersed in the reaction product by using a method of vigorous stirring in combination with ultrasonic dispersion, and a dispersant diisocyanate is appropriately added. When the dispersion is complete, adding a cross-linking agent N, N-methylene bisacrylamide to convert the linear polymer into a polymer with a cross-linked network structure. The crosslinked product is coated on a substrate (such as a release film), and then dried and aged to obtain an optical adhesive with a thickness of 100 microns, and the dielectric constant, the visible light transmittance and the ultraviolet light transmittance (with a wavelength of about 340 nm) of the obtained optical adhesive are measured.

The results of the performance testing of examples 1 to 4 are shown in table 1 below:

compared with the organic cover plate with the dielectric constant lower than 3 in the prior art, the conductive particles are added into the organic material, so that the dielectric constant of the organic cover plate and/or the optical cement is increased to more than 3, and the dielectric constant is increased, so that the touch sensitivity of the touch display device is improved. In addition, the visible light transmittance of the organic cover plate and/or the optical adhesive after the conductive particles are added can still be kept above 85%, and the light transmittance of the UV wave band is kept below 40%, which proves that the display effect is not influenced by the addition of the conductive particles.

The foregoing provides a detailed description of embodiments of the present application, and the principles and embodiments of the present application have been described herein using specific examples, which are presented solely to aid in the understanding of the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A touch display device, comprising:

an organic light emitting display module;

2. The touch display device according to claim 1, further comprising a color film layer disposed between the touch module and the optical adhesive, wherein the color film layer includes a plurality of color films disposed at intervals and a black matrix disposed between two adjacent color films, and the first conductive material includes a black conductive material.

3. The touch display device according to claim 2, wherein the black conductive material is a carbon nanotube, a tube length of the carbon nanotube is greater than 0 micron and less than 1 micron, and a tube diameter of the carbon nanotube ranges from 1nm to 2 nm.

4. The touch display device of claim 1, wherein the organic cover plate or the optical adhesive dispersed with the first conductive material has a dielectric constant of 3.2 Fa/m or more at 1kHz, a visible light transmittance of 80% or more, and an ultraviolet light transmittance of 40% or less.

5. The touch display device according to claim 4, wherein the organic cover plate or the optical adhesive comprises a polymer layer and the first conductive material dispersed in the polymer layer, and the organic cover plate or the optical adhesive is manufactured in a mass ratio of the first conductive material to a monomer of the polymer layer is greater than or equal to 0.1.

6. The touch display device of claim 1, wherein the organic cover plate or the optical adhesive comprises a polymer layer and the first conductive material dispersed in the polymer layer, the material of the polymer layer comprises at least one of an acrylic resin, a silicone rubber, a polyurethane adhesive, and an epoxy resin, the polymer layer has a cross-linked network structure, the organic cover plate or the optical adhesive further comprises a dispersant and a cross-linking agent, and the first conductive material is at least one selected from a metal particle, a carbon nanotube, and graphene.

7. The touch display device according to claim 2, further comprising a planarization layer, the planarization layer being located between the color film and the optical adhesive and covering the color film, wherein a second conductive material is dispersed in at least one of the planarization layer, the color film, and the black matrix.

8. The touch display device of claim 1, further comprising a polarizer disposed between the touch module and the organic cover plate, wherein the optical glue comprises a first optical glue and a second optical glue, the first optical glue is disposed between the polarizer and the touch module, the second optical glue is disposed between the polarizer and the organic cover plate, and the first conductive material is dispersed in the first optical glue and/or the second optical glue.

9. The touch display device of claim 8, wherein the polarizer comprises a pressure sensitive adhesive having a third conductive material dispersed therein.

10. A touch display device, comprising:

an organic light emitting display module;

the polaroid is arranged between the touch module and the organic cover plate;

the polaroid comprises a pressure-sensitive adhesive, and a first conductive material is dispersed in the pressure-sensitive adhesive.

11. A manufacturing method of a touch display device is characterized by comprising the following steps:

providing an organic light emitting display module;

mixing a monomer, an initiator and a solvent;

polymerizing the monomers to form a linear polymer;