CN111625149A - Conductive shielding module, manufacturing method thereof and display device - Google Patents
Conductive shielding module, manufacturing method thereof and display device Download PDFInfo
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/552—Protection against radiation, e.g. light or electromagnetic waves
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04107—Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
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Abstract
The embodiment of the invention provides a conductive shielding module, a manufacturing method thereof and a display device. The conductive shielding module provided by the embodiment of the invention comprises a first substrate and a composite conductive film, wherein the composite conductive film is positioned on one side of the first substrate, and comprises a graphene film and a plurality of SiC/SiO with core/shell structures2Nanoparticles, SiC/SiO of multiple core/shell structure2The nanoparticles are dispersed in the graphene film. When the conductive shielding module provided by the embodiment of the invention is applied to a display device, the rainbow texture phenomenon during display can be improved, the electromagnetic interference during touch detection is reduced, and the reflection of the display device to ambient light is reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to a conductive shielding module, a manufacturing method thereof and a display device.
Background
With the development of display technology and the increasing application demand of consumers, the floating touch technology is also studied more and more deeply by various manufacturers. The floating touch is a novel touch method that can realize touch operation when the touch display device is not touched. The existing display device with the suspension touch control function has the problems of high display screen reflectivity, visible rainbow patterns, large electromagnetic interference and the like.
Disclosure of Invention
The embodiment of the invention provides a conductive shielding module, a manufacturing method thereof and a display device, and aims to solve the problems that a display device with a suspension touch function in the prior art is high in display screen reflectivity, visible in rainbow patterns, large in electromagnetic interference and the like.
In a first aspect, an embodiment of the present invention provides a conductive shielding module, which includes a first substrate and a composite conductive film located on one side of the first substrate, where the composite conductive film includes a graphene film and a plurality of core/shell structured SiC/SiO films2Nanoparticles, SiC/SiO of multiple core/shell structure2The nanoparticles are dispersed in the graphene film.
In a second aspect, an embodiment of the present invention further provides a display device, including the conductive shielding module provided in any embodiment of the present invention; and the conductive shielding module is positioned between the display module and the touch function module.
In a third aspect, an embodiment of the present invention further provides a method for manufacturing a conductive shielding module, where the conductive shielding module includes a first substrate and a composite conductive film, where the composite conductive film includes a graphene film and a plurality of core/shell structured SiC/SiO2 nanoparticles, and the plurality of core/shell structured SiC/SiO2 nanoparticles2The preparation method of the graphene film comprises the following steps:
the method for manufacturing the composite conductive film on the first substrate specifically comprises the following steps:
making SiC/SiO including core/shell structures2A sol of nanoparticles;
preparing the sol on a first substrate, and drying to obtain SiC/SiO coated with multiple core/shell structures2A first substrate of nanoparticles;
SiC/SiO coated with multiple core/shell structures on a first substrate2One side of the nano particle grows a graphene film, and SiC/SiO with a plurality of core/shell structures2The nano particles are dispersed in the graphene film to form the composite conductive film.
The conductive shielding module, the manufacturing method thereof and the display device provided by the embodiment of the invention have the following beneficial effects: the conductive shielding module comprises a first substrate and a composite conductive filmThe composite conductive film comprises a graphene film and SiC/SiO with a core/shell structure dispersed in the graphene film2The nano particles are applied to a display device with a suspension touch control function, and the conductive shielding module can shield noise from the display module. The gaps between adjacent SiC/SiO2 nano-particles with core/shell structures can promote the scattering and multiple reflection of electromagnetic waves, the electromagnetic waves can interact with the structures in the composite conductive film and are converted into energy in other forms in the process of propagating in the composite conductive film, and the composite conductive film has the characteristic of absorbing the electromagnetic waves, so that the problem of electromagnetic interference of high-voltage signals applied to the composite conductive film on touch detection can be solved. Meanwhile, after the light rays are emitted into the conductive shielding module, the light rays are reflected, refracted and scattered for multiple times, the probability that the light rays change the light path, are emitted out of the conductive shielding module again, then emitted to the touch control function module, and finally emitted out of the display device to be received by human eyes is reduced, and therefore the reflectivity of the conductive shielding module to ambient light can be reduced. In addition, the graphene, SiC and SiO are used2The materials do not have the birefringence characteristic, so, the light of penetrating into electrically conductive shielding module by the display module can not produce the birefringence phenomenon in electrically conductive shielding module, and then has avoided producing rainbow line phenomenon in display device use, has promoted display effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without inventive labor.
FIG. 1 is a schematic diagram of a display device according to the related art;
fig. 2 is a schematic structural diagram of a conductive shielding module according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a display device according to an embodiment of the present invention;
FIG. 4 is a first schematic diagram of antireflection performed by the conductive shielding module according to the embodiment of the present invention;
FIG. 5 is a schematic diagram of an embodiment of a conductive shielding module for absorbing electromagnetic waves;
FIG. 6 is a flowchart illustrating a method for manufacturing a conductive shielding module according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a second antireflection principle applied in the embodiment of the present invention;
FIG. 8 is a chart of simulation results in an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a display device according to an embodiment of the invention;
fig. 10 is a schematic top view of a touch functional layer in a display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Fig. 1 is a schematic view of a display device in the related art, and as shown in fig. 1, the display device includes a display module 10, a shielding module 11 and a touch module 12, wherein the shielding module 11 includes a PET (polyethylene terephthalate) substrate 111 and an ITO (indium tin oxide) film 112. The ITO is manufactured on the PET substrate to form a shielding module 11 for shielding a display signal from the display module 10, so that noise interference of the display signal to a touch signal is avoided, and a suspended touch function is realized.
In the current manufacturing process of the shielding module 11, the PET substrate 111 is biaxially stretched by stress, resulting in anisotropy and exhibiting birefringence. The light rays emitted into the shielding module 11 by the display module 10 can become two beams of light with the light vector directions respectively including the fast axis and the slow axis after being acted by the PET substrate 111, when a user wears the polarized sunglasses to watch, the two beams of light with the light vector directions respectively including the fast axis and the slow axis have phase difference (also called optical path difference) after penetrating through the polarized sunglasses, and then the two beams of light interfere. Since the stress of the PET substrate 111 is not uniform, and the stress distribution of each lamination structure (touch module, protective layer, adhesive layer, etc.) on the shielding module 11 is also complicated, the phase difference of the light emitted from the display device is increased, and the interference level is increased. Within the visible wavelength range, the color streak phenomenon appears after the transmitted light with each wavelength is superposed and mixed.
In addition, the refractive index of each laminated structure of the display device has a certain difference, and after external ambient light enters the display device, each laminated structure has a certain reflectivity to the ambient light. When the shielding module 11 is made of an ITO film of 150 Ω/□, the reflectance of the display device to ambient light is increased by about 1%; in order to enhance the shielding capability and improve the electrical performance of the floating touch, the thickness of the ITO film is usually further increased, and after the shielding module 11 is made of the ITO film of 80 Ω/□, the reflectivity of the display device to the ambient light is increased by about 1.5%, that is, the reflectivity is increased. Therefore, the shielding module 11 made of the ITO film is difficult to find a good balance between the shielding capability and the reflectivity to the ambient light, and is difficult to meet the needs of customers.
Moreover, in the practical application of the floating touch function, a high-voltage signal needs to be applied to the ITO film 112 of the shielding module 11 to effectively increase the signal-to-noise ratio, so as to ensure that the touch function module can detect the signal to effectively report the point when the finger is in the floating state. However, a high-voltage signal applied to the ITO film may also generate a certain electromagnetic interference to the touch detection.
Based on the above problems, embodiments of the present invention provide a conductive shielding module, a manufacturing method thereof, and a display device, in which a novel composite conductive film is designed to replace an ITO film to be used as a shielding layer, so as to improve a rainbow streak phenomenon in the related art. And the reflectivity of the conductive shielding module to the ambient light is reduced through the special structure of the composite conductive film, the reflection of the whole display device to the ambient light is reduced, and the display effect is improved. In addition, the electromagnetic wave is scattered and reflected for multiple times through the special structure of the composite conductive film, so that the composite conductive film has the characteristic of absorbing the electromagnetic wave, and the problem of electromagnetic interference generated by a high-voltage signal applied to the composite conductive film on touch detection is solved.
Fig. 2 is a schematic structural diagram of a conductive shielding module according to an embodiment of the present invention. Fig. 3 is a schematic view of a display device according to an embodiment of the invention. Fig. 4 is a first schematic diagram of antireflection by the conductive shielding module according to the embodiment of the present invention, and fig. 5 is a schematic diagram of electromagnetic wave absorption by the conductive shielding module according to the embodiment of the present invention.
As shown in fig. 2, the conductive shielding module 30 includes a first substrate 31 and a composite conductive film 32, the composite conductive film 32 is located on one side of the first substrate 31, wherein the composite conductive film 32 includes a graphene film 321 and a plurality of core/shell structured SiC/SiO structures2Nanoparticle 322, core/shell structured SiC/SiO2Nanoparticle 322, i.e. SiC coated with SiO2Coated nanoscale particles, core/shell structured SiC/SiO2The nanoparticles 322 are three-dimensional spherical structures. Multiple core/shell structured SiC/SiO2The nanoparticles 322 are dispersed in the graphene thin film 321. The composite conductive film 32 in the embodiment of the invention is equivalent to a graphene nano magnetic ternary composite material film.
As shown in fig. 3, an embodiment of the invention provides a display device, which includes the conductive shielding module 30, the display module 20, and the touch module 40, wherein the conductive shielding module 30 is located between the display module 20 and the touch module 40, and the composite conductive film 32 is located on a side of the first substrate 31 away from the display module 20. In another embodiment, the composite conductive film 32 is located on a side of the first substrate 31 close to the display module 20. The display device in the embodiment of the invention can be any equipment with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, a television, a vehicle-mounted central control device, an instrument panel and the like.
The display module 20 shown in fig. 3 is only simplified, and the type of the display module 20 in the embodiment of the present invention is not limited, for example, the display module 20 includes any one of a liquid crystal display panel, an organic light Emitting display panel, and a micro led (light Emitting diode) display panel. The touch function module 40 can be used to implement a floating touch function; graphene film 321 in conductive shielding module 30 has good conductive performance, and after a high-voltage signal is applied to graphene film 321 in the suspension touch detection, conductive shielding module 30 is used to shield noise from display module 20 in the suspension touch detection. After being emitted from the display module 20, the light rays sequentially penetrate through the conductive shielding module 30 and the touch functional module 40 and then are emitted, so as to form display.
As shown in FIG. 4, the conductive shielding module 30 is shown, and after the light is emitted into the conductive shielding module 30, the SiO is formed at the interface where the graphene film 321 and the core/shell structure nanoparticles 322 are in contact2The interface where the shell and the SiC core are in contact and the interface where the graphene film 321 and the first substrate 31 are in contact are refracted and reflected, and the SiC/SiO is in a core/shell structure in the conductive shielding module 302Presence of nanoparticles 322, core/Shell Structure SiC/SiO2Surface of nanoparticle 322, and SiO2The interfaces of the shell and the SiC core which are contacted have certain curvature, so that the light rays are in the SiC/SiO of the core/shell structure2Surface of nanoparticle 322, and SiO2Scattering may also occur at the interface where the shell and the SiC core are in contact. That is to say, when the conductive shielding module 30 is applied to the display device, the ambient light is reflected, refracted, and scattered many times after entering the conductive shielding module 30, and then the probability that the light changes the light path, and the light is emitted again from the conductive shielding module 30, then emitted to the touch functional module 40, and finally emitted to the display device and received by human eyes is reduced, so that the reflectivity of the conductive shielding module 30 to the ambient light can be reduced.
As shown in FIG. 5, in the composite conductive film 32 of the conductive shield mold set 30, a plurality of core/shell structured SiC/SiO2The nanoparticles 322 are dispersed in graphiteIn the olefin thin film 321, the adjacent core/shell structure SiC/SiO2The gaps between the nanoparticles 322 may promote scattering and multiple reflections of the electromagnetic wave, and the electromagnetic wave interacts with the structures in the composite conductive film 32 and is converted into other forms of energy (e.g., mechanical energy, electrical energy, or thermal energy) during propagation inside the composite conductive film 32. The composite conductive film 32 has the property of absorbing electromagnetic waves, so that the problem of electromagnetic interference generated by a high-voltage signal applied to the composite conductive film on touch detection can be solved.
In addition, in the embodiment of the invention, the conductive shielding module comprising the graphene nano-magnetic ternary composite material film is adopted to replace an ITO film with a PET substrate, the graphene nano-magnetic ternary composite material film does not need to be manufactured on the PET substrate, and the graphene, SiC and SiO are used for shielding the ITO film2None of the materials has birefringent properties. When the conductive shielding module is applied to the display device, the light rays emitted into the conductive shielding module by the display module do not generate birefringence in the conductive shielding module, so that rainbow patterns generated in the use process of the display device are avoided, and the display effect is improved. Specifically, in the embodiment of the present invention, the first substrate 31 includes any one of a quartz substrate and a sapphire substrate. The main component of the quartz substrate is SiO2，SiO2The crystal belongs to oxide mineral of trigonal system, belongs to optical uniaxial crystal, and has no birefringence. When the conductive shielding module is applied to a display device, the light rays emitted into the conductive shielding module by the display module can not generate the double refraction phenomenon in the conductive shielding module; and the main component of the quartz substrate and the SiC/SiO of the core/shell structure2The components of the shell structure of the nanoparticles are the same, so that the refractive index of the first substrate can be matched with the refractive index of the core/shell structure nanoparticles, and the reflection of the conductive shielding module on ambient light is reduced by designing the size of the core/shell structure nanoparticles, the thickness of the composite conductive film and other parameters. In addition, the sapphire crystal in the sapphire substrate belongs to a hexagonal lattice structure and also belongs to an optical uniaxial crystal, the sapphire substrate does not have birefringence characteristics, the sapphire substrate is adopted to manufacture the conductive shielding module, and the display module is injected into the conductive shielding moduleThe light can not generate birefringence in the conductive shielding module, and further rainbow patterns in the use process of the display device are avoided. In addition, the high temperature resistance of the quartz substrate and the sapphire substrate is superior to that of a PET substrate and a glass substrate, and any one of the quartz substrate and the sapphire substrate is used as the first substrate, so that the process condition of the composite conductive film can be met.
Further, an embodiment of the present invention further provides a method for manufacturing a conductive shielding module, and fig. 6 is a flowchart for manufacturing the conductive shielding module according to the embodiment of the present invention. The manufacturing method of the conductive shielding module comprises the following steps: a composite conductive film is formed on the first substrate, and as shown in fig. 6, the composite conductive film specifically includes:
step S101: making SiC/SiO including core/shell structures2A sol of nanoparticles. In which, firstly, acid-catalyzed SiO is obtained2Coating SiO on the surface of the monocrystal SiC nanometer microsphere by adopting a soaking and pulling mode2SiC/SiO forming core/shell structure2Nano particles, SiC/SiO with core/shell structure can be adjusted by controlling the particle size and the pulling speed of SiC nano microspheres2The size of the nanoparticles.
Step S102: preparing the sol on a first substrate, and drying to obtain SiC/SiO coated with multiple core/shell structures2A first substrate of nanoparticles; the first substrate may be any one of a glass substrate, a quartz substrate, and a sapphire substrate. Alternatively, the sol is prepared on the first substrate and then the sol is added at 0.1mol-1Soaking in the copper acetate solution for 10min, sucking away the excessive copper acetate solution with filter paper, and drying in a 60 deg.C oven to obtain SiC/SiO coated with multiple core/shell structures2A first substrate of nanoparticles.
Step S103: SiC/SiO coated with multiple core/shell structures on a first substrate2One side of the nano particle grows a graphene film, and SiC/SiO with a plurality of core/shell structures2The nano particles are dispersed in the graphene film to form the composite conductive film. Optionally, impregnating the SiC/SiO coated with multiple core/shell structures2The first substrate of the nano particles is placed in the center of the tube furnace, and 15sccm is introducedExhausting hydrogen and 230sccm argon for 30min, raising the temperature of the furnace to 1000 ℃ within 40min, preserving the temperature for 30min in the atmosphere of the hydrogen and the argon, reducing the hydrogen flow rate to 5sccm, and introducing 15sccm methane gas to grow the graphene. After the reaction is finished, stopping introducing methane gas, and cooling to room temperature in a hydrogen and argon atmosphere to obtain graphene/SiC/SiO2A nanocomposite conductive film.
The conductive shielding module comprising the first substrate and the composite conductive film can be manufactured by the method provided by the embodiment of fig. 6, wherein the composite conductive film is manufactured on the first substrate, and the composite conductive film comprises a graphene film and a core/shell structured SiC/SiO film dispersed in the graphene film2Nanoparticles. The composite conductive film does not need to be manufactured on a PET substrate, and graphene, SiC and SiO2The materials do not have the birefringence characteristic, so that the light rays emitted into the conductive shielding module from the display module in the display device can not generate the birefringence phenomenon in the conductive shielding module. Adjacent core/shell structured SiC/SiO2The gaps among the nano particles can promote the scattering and multiple reflection of electromagnetic waves, and the composite conductive film has the characteristic of absorbing the electromagnetic waves, so that the problem of electromagnetic interference on touch detection caused by a high-voltage signal applied on the composite conductive film can be solved. In addition, in practical application, the light rays are reflected, refracted and scattered for multiple times after being emitted into the conductive shielding module, so that the probability that the light rays change the light path, are emitted from the conductive shielding module again, emitted to the touch functional module and finally emitted out of the display device to be received by human eyes is reduced, and the reflectivity of the conductive shielding module to the ambient light can also be reduced.
In the embodiment of the invention, SiC/SiO of a core/shell structure2The radius of the nano particle is R, SiC/SiO of core/shell structure2The radius of the SiC core in the nano particles is R, wherein R is more than or equal to R-R. R-R is the thickness of the shell structure in the core-shell structure nano particle. In the manufacturing process, SiO needs to be coated on the outer side of SiC nanometer particles2The core-shell structure is formed, the radius of the core structure manufactured by the embodiment is larger than or equal to the thickness of the shell structure, the structure is easier to realize, and the process is simpler.
At one endIn one embodiment, as shown with continued reference to FIG. 2 above, the composite conductive film has a thickness d and a core/shell structure of SiC/SiO2The radius of the nanoparticle is R (not indicated in the figure); wherein, 2R<d<4R. That is, the thickness of the composite conductive film is greater than the particle diameter of one core/shell structure nanoparticle and is less than twice the particle diameter of one core/shell structure nanoparticle, that is, only one layer of core/shell structure nanoparticle is included in the composite conductive film, so that the thickness of the formed graphene nano magnetic ternary composite material film can be ensured to be relatively thin, the transmittance of the whole conductive shielding module to light is ensured to be relatively high, and further the brightness of the display device is ensured.
In an embodiment, fig. 7 is a schematic diagram illustrating a second antireflection principle applied in the embodiment of the present invention. As shown in fig. 7, the first substrate 31 and the composite conductive film 32 in the conductive shielding module are simply illustrated, and a light ray S1 'emitted from air to the conductive shielding module is illustrated by taking the contact with air on the composite conductive film 32 as an example, and the light ray S1' is used for simulating the ambient light emitted to the conductive shielding module. Other interactions of light in the electrically conductive shielding module, such as scattering and absorption, are assumed to be negligible. The incident angle of the light ray S1' is α, the refraction angle of the light ray incident into the composite conductive film 32 is β, the light ray S1 is obtained by primary reflection of the incident light at the interface where the composite conductive film 32 contacts with the air, and the light ray S2 is obtained by both-side refraction of the incident light at the interface where the composite conductive film 32 contacts with the air and primary reflection at the interface where the composite conductive film 32 contacts with the first substrate 31. After multiple refractions and reflections, the light rays returning to the air from the conductive shielding module are mainly the light rays S1 and the light rays S2.
The optical path difference between the light ray S1 and the light ray S2 is L derived from the geometric relationship,
where n1 is the refractive index of the composite conductive film. To ensure the two beams are destructively coherent, the optical path difference between the light ray S1 and the light ray S2 must be an odd multiple of half wavelength, which is satisfied
Where λ is the wavelength of the incident light, k constant, i.e., k can be a natural number other than 0 when only normal incidence is considered, then β is 0, thus
The thickness of the composite conductive film 32
Under the condition that satisfies this formula, according to the principle of destructive interference, the reflectivity of electrically conductive shielding module to ambient light is minimum to can be favorable to reducing the whole reflection to ambient light of display device.
Further, in the embodiment of the present invention, the thickness d of the composite conductive film is limited, the wavelength range of visible light is 380nm to 780nm, and the thickness d is substituted into formula 1 obtained by the principle analysis corresponding to fig. 7 to obtain the composite conductive film
Here, k constant, that is, k may be a natural number other than 0, and n1 is a refractive index of the composite conductive film. The composite conductive film in the conductive shielding module satisfies the thickness range, and the probability of destructive interference of the ambient light injected into the conductive shielding module after the reflection and refraction of the composite conductive film to the light returning to the side far away from the display module is higher, namely the reflectivity of the conductive shielding module to the ambient light is relatively lower, so that the reflection of the whole display device to the ambient light can be favorably reduced.
Further, considering that the human eye is sensitive to green light with a wavelength of 550nm, in one embodiment, the wavelength λ of incident light is 550nm and is substituted into the above formula 1, so that the thickness d of the composite conductive film satisfies the requirement of the above formula 1
Here, k constant, that is, k may be a natural number other than 0, and n1 is a refractive index of the composite conductive film. The composite conductive film in the conductive shielding module satisfies the thickness range, and then the interference cancellation can be generated by the green light component in the ambient light which is injected into the conductive shielding module after the reflection and refraction of the composite conductive film and the light returning to one side far away from the display module again, so that the reflectivity of the conductive shielding module to the green light in the ambient light is minimum, the reflection of the whole display device to the green light is favorably reduced, which is equivalent to that human eyes are insensitive to most of the ambient light reflected by the display device, and the whole display effect of the display device can be improved.
Furthermore, the invention carries out simulation test on the reflectivity of the composite conductive films with different thicknesses to light. The SiC/SiO of the embodiment of the invention comprising the graphene film and the core/shell structure is tested2The reflection coefficient of the composite conductive film of the nano particles and the reflection coefficients of the graphene films with different thicknesses are obtained, wherein in the simulation test, the SiC/SiO of the core/shell structure corresponds to the composite conductive films with different thicknesses2The particle size of the nanoparticles is approximately the same. FIG. 8 is a chart of simulation results in an embodiment of the present invention. As shown in fig. 8, the abscissa is thickness (nm) and the ordinate is reflectance (%). In the embodiment of the invention, the curve of the reflection coefficient of the composite conductive film along with the thickness is A, and the curve of the reflection coefficient of the graphene film along with the thickness is B. It can be seen that, in the embodiment of the present invention, the reflection coefficients of the composite conductive film are relatively low under different thicknesses, and when the film thickness is in a range from 210nm to 275nm, the reflection coefficient of the composite conductive film is smaller than that of the graphene film under the same thickness. Therefore, the conductive shielding module with the composite conductive film in the embodiment of the invention has relatively small overall reflection coefficient and low reflectivity to ambient light.
In one embodiment, the thickness of the composite conductive film is d, wherein d is more than or equal to 200nm and less than or equal to 1000 nm. In the thickness range, SiC/SiO by designing core/shell structure2The particle size of the nanoparticles is matched with the particle size of the nanoparticles to obtain a conductive shielding module, and when the conductive shielding module is applied to a display device, the conductive shielding is reducedThe module is to the reflectivity of ambient light, avoided producing rainbow line phenomenon in display device use, absorb the electromagnetic wave simultaneously and improve the high-voltage signal who applys on the compound conductive film and to the problem that touch-control detection produced electromagnetic interference.
Further, in one embodiment, the thickness of the composite conductive film is d, wherein d is more than or equal to 200nm and less than or equal to 300 nm. In this embodiment, the thickness of the composite conductive film is relatively thin, and the overall thickness of the conductive shielding module is relatively thin, so as to ensure that the overall transmittance of the conductive shielding module to light is relatively high, and further ensure the brightness of the display device.
In one embodiment, the thickness of the composite conductive film is 240nm, and the SiC/SiO of a core/shell structure2The particle diameter of the nano-particle is 200nm, the radius of the SiC core in the nano-particle with the core/shell structure is 50nm, namely SiO2The thickness of the shell is approximately 50 nm. In the embodiment, the whole thickness of the conductive shielding module is thinner, so that the high transmittance of the whole conductive shielding module to light rays can be ensured, and further the brightness of the display device is ensured. Meanwhile, the reflectivity of the conductive shielding module to ambient light is low; the light rays entering the conductive shielding module can not generate double refraction phenomenon in the conductive shielding module, so that rainbow patterns are avoided in the use process of the display device; meanwhile, the gaps of the core/shell structure nano particles can absorb electromagnetic waves, so that the problem of electromagnetic interference on touch detection caused by high-voltage signals applied to the composite conductive film is solved.
Preferably, in the display device provided by the embodiment of the present invention, the composite conductive film 32 is located on the side of the first substrate 31 away from the display module 20, in this embodiment, the ambient light enters the conductive shielding module 30 and passes through the microstructure (core/shell structured SiC/SiO) in the composite conductive film2Nano particles), the light interference is cancelled and is ejected out by the composite conductive film again, the interference caused by the fact that the light passes through the first substrate again is avoided, and therefore the reflectivity of the conductive shielding module to the ambient light can be favorably reduced.
In an embodiment, fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention. Fig. 10 is a schematic top view of a touch functional layer in a display device according to an embodiment of the present invention. As shown in fig. 9, the touch functional module 40 includes a second substrate 41 and a touch functional layer 42, and the touch functional layer 42 is located on a side of the second substrate 41 close to the conductive shielding layer 30. As shown in fig. 10, a structure of the touch functional layer 42 is illustrated, the touch functional layer includes a plurality of first electrodes 421 and a plurality of second electrodes 422, and the touch functional layer includes a plurality of electrode rows and a plurality of electrode columns. Wherein, a plurality of first electrodes 421 arranged along the first direction x are electrically connected in sequence to form an electrode row; the plurality of second electrodes 422 arranged along the second direction y are sequentially electrically connected to form an electrode column. In this embodiment, a touch functional layer is formed on the second substrate to form a touch functional module, and then the touch functional module is attached to other module structures in the display device. The touch control functional layer is prevented from being directly manufactured on other module structures, so that the process conditions have deterioration influence on other module structures.
In one embodiment, the second substrate 41 is multiplexed into a protective cover sheet. Alternatively, the second substrate 41 is a glass substrate. The second basement not only can regard as the supporting substrate when touch-control function rete preparation, and when touch-control function module and other module structures of display device laminated, the second basement can regard as the protection apron to be used for protecting the interior rete structure of display device moreover, and then the display device outside need not additionally set up the protection apron again, is favorable to the attenuate of display device thickness.
As shown in fig. 9, one side of the first substrate 31 of the conductive shielding module 30 is bonded to the display module 20 through a first adhesive layer 51, and one side of the composite conductive film 32 of the conductive shielding module 30 is bonded to the touch functional film 42 through a second adhesive layer 52. In this embodiment, during the manufacturing, after the conductive shielding module, the display module and the touch module are all independently manufactured, the bonding and the attaching are performed according to the set position relationship, and then each module is independently manufactured, so that the process does not have a degradation effect on structures in other modules, and the yield of the display device is improved. In addition, in this embodiment, the touch function film layer in the touch function module is bonded to the conductive shielding module through the adhesive layer, that is, the second substrate in the touch function module is located on the side of the conductive shielding module away from the display module, and the second substrate can be reused as the protective cover plate to protect the film layer structure in the display device.
In one embodiment, the display module comprises a display area and a non-display area, and the conductive shielding module covers the whole display area and extends from the display area to the non-display area. The conductive shielding module further comprises a metal contact part, the metal contact part is arranged around the display area, and the metal contact part is electrically connected with the composite conductive film in the conductive shielding module through at least two through holes, so that voltage is provided for the composite conductive film. In the embodiment, the metal contact part is connected with the composite conductive film in parallel, and the contact area of the metal contact part and the composite conductive film can be increased, so that the voltage drop loss of the voltage signal provided for the composite conductive film is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (12)
1. A conductive shielding module is characterized in that,
the conductive shielding module comprises a first substrate and a composite conductive film, wherein the composite conductive film is positioned on one side of the first substrate, and comprises a graphene film and a plurality of SiC/SiO electrodes with core/shell structures2Nanoparticles, SiC/SiO of said plurality of core/shell structures2Nanoparticles are dispersed in the graphene thin film.
2. The conductive shielding module of claim 1,
the first substrate includes any one of a quartz substrate and a sapphire substrate.
3. The conductive shielding module of claim 1,
the core/shell structure of SiC/SiO2The radius of the nano particle is R, and the SiC/SiO of the core/shell structure2The radius of the SiC core in the nano particles is R, wherein R is more than or equal to R-R.
4. The conductive shielding module of claim 1,
the thickness of the composite conductive film is d, and the SiC/SiO of the core/shell structure2The radius of the nano particles is R; wherein, 2R<d<4R。
5. The conductive shielding module of claim 1,
the composite conductive film has a thickness d, wherein,
k is a constant, and n1 is the refractive index of the composite conductive film.
6. The conductive shielding module of claim 5,
7. the conductive shielding module of claim 1,
the thickness of the composite conductive film is d, wherein d is more than or equal to 200nm and less than or equal to 1000 nm.
8. A display device, comprising:
the conductive shielding module of any one of claims 1 to 7; and
the conductive shielding module is positioned between the display module and the touch function module.
9. The display device according to claim 8,
the touch control functional module comprises a second substrate and a touch control functional layer, and the touch control functional layer is positioned on one side, close to the conductive shielding module, of the second substrate.
10. The display device according to claim 9,
the second substrate is reused as a protective cover plate.
11. The display device according to claim 8,
one side of the first substrate of the conductive shielding module is bonded and attached to the display module through a first adhesive layer, and one side of the composite conductive film of the conductive shielding module is bonded and attached to the touch control functional layer through a second adhesive layer.
12. The manufacturing method of the conductive shielding module is characterized in that the conductive shielding module comprises a first substrate and a composite conductive film, wherein the composite conductive film comprises a graphene film and a plurality of SiC/SiO with core/shell structures2Nanoparticles, SiC/SiO of said plurality of core/shell structures2The nano particles are dispersed in the graphene film, and the manufacturing method comprises the following steps:
manufacturing the composite conductive film on the first substrate, specifically comprising:
making SiC/SiO including core/shell structures2A sol of nanoparticles;
the sol is manufactured on the first substrate and is dried to formSiC/SiO coated with multiple core/shell structures2The first substrate of nanoparticles;
SiC/SiO coated with the plurality of core/shell structures on the first substrate2One side of the nano particle is grown with a graphene film, and the SiC/SiO of the plurality of core/shell structures2And the nano particles are dispersed in the graphene film to form the composite conductive film.
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