CN113156708A - Quantum dot diffusion plate for preventing quantum dots from being dissipated by heating, manufacturing method and backlight module - Google Patents

Quantum dot diffusion plate for preventing quantum dots from being dissipated by heating, manufacturing method and backlight module Download PDF

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Publication number
CN113156708A
CN113156708A CN202110502435.6A CN202110502435A CN113156708A CN 113156708 A CN113156708 A CN 113156708A CN 202110502435 A CN202110502435 A CN 202110502435A CN 113156708 A CN113156708 A CN 113156708A
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light
quantum dot
diffusion plate
diffusion
transmitting
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CN113156708B (en
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庄瑞睦
庄瑞荣
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Shenzhen Tiannuotong Optoelectronics Technology Co ltd
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Shenzhen Tiannuotong Optoelectronics Technology Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0294—Diffusing elements; Afocal elements characterized by the use adapted to provide an additional optical effect, e.g. anti-reflection or filter

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Dispersion Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The invention relates to a quantum dot diffusion plate for preventing quantum dots from being heated and dissipated, a manufacturing method and a backlight module. The finished product of the example of the invention provides three protective measures for preventing the quantum dots from escaping, and has the effect of preventing the quantum dots from being heated and dissipated.

Description

Quantum dot diffusion plate for preventing quantum dots from being dissipated by heating, manufacturing method and backlight module
The priority basis of the present invention is: application No. 202010514395.2, application No. 2020.06.08, patent name "Quantum dot diffusion plate for preventing quantum dot from heat dissipation, manufacturing method and backlight module".
Technical Field
The invention relates to the technical field of diffusion plates of display screen backlight modules, in particular to a quantum dot diffusion plate for preventing quantum dots from being heated and dissipated, a manufacturing method and a backlight module.
Background
The diffusion plate is generally used in a backlight module, and the specific application is a direct type backlight module using an LED light source, and the light emitted by the light source is spread mainly by using a multi-angle light refraction principle, so that the diffusion plate is different from the bundling application of illumination, and can have more uniform luminous performance in the application of a display panel. The early LED light source was installed with three-color lamp beads, but the light margin performance (e.g. 70% NTSC) was not as good as that of the OLED product (e.g. 100% NTSC) due to the limited choice of chip process and semiconductor light-emitting quantum well material, and the quantum dot technology was proposed later, in which a quantum dot film was disposed in the product, and the quantum dot film could absorb a certain color light of a specific wavelength and convert it into another color light of another wavelength, thereby greatly increasing the light margin performance of the backlight module. In prior art's backlight unit, the diffuser plate is the nearest lamp pearl on the mounted position, and secondly quantum dot membrane, membrane of adding lustre to install the display screen at last. The quantum dot film may be one or more than one film until the desired light-rich performance is achieved.
Since the quantum dot film is a relatively expensive and process sensitive material, the farther the quantum dot film is from the lamp bead after light diffusion, the more quantum dot material needs to be used. For this reason, in order to reduce the thickness of the backlight unit, a quantum dot diffusion plate has been proposed in recent years, in which a quantum dot material is mixed into the diffusion plate to omit the use of a quantum dot film or to reduce the number of quantum dot films used. Unlike the quantum dot film, the diffusion plate has a thick thickness required to diffuse light, and it is found in actual manufacturing that a small amount of quantum dot material having a small particle diameter is not easily uniformly dispersed in the diffusion plate, which causes a problem of uneven distribution of color light, and tends to be yellowish or reddish in a portion where the quantum dot material is distributed more and bluish in a portion where the quantum dot material is distributed less. Meanwhile, the quantum dot material is found to be heat-labile in use and is easy to dissipate at high temperature, which causes the quantum dot diffusion plate to gradually lose the performance of light wavelength conversion, and gradually deteriorate the performance of the quantum dot diffusion plate to the disadvantage of only having the basic function of the diffusion plate. The quantum dot diffusion plate close to the lamp beads is easy to be heated in the use of the quantum dot diffusion plate, so that the quantum dot material is effectively locked in the diffusion plate, and the quantum dot material can be uniformly distributed along with the traditional diffusion plate manufacturing process.
The patent application publication No. CN102980136A discloses a direct type backlight module and a light source diffusion structure thereof, the light source diffusion structure comprises: the diffusion body, the quantum dot fluorescent powder and the water-blocking gas layers are arranged on the substrate; wherein, a plurality of quantum dot fluorescent powders are dispersed in the diffusion body; the plurality of water-blocking air layers are positioned on the surface of the diffusion body. In the invention, the plurality of quantum dot fluorescent powders are dispersed in the diffusion body of the diffusion plate or the diffusion sheet, so that the service life of the diffusion plate or the diffusion sheet can be prolonged, and the problem of light recession can be alleviated. The quantum dot fluorescent powder is of a nano quantum dot structure, has the characteristics of difficult dispersion and easy disordered agglomeration, can be prepared and dispersed in solid diffusion particles by a plurality of quantum dot fluorescent powders, and then uniformly arranges the diffusion particles with the quantum dot fluorescent powders in the diffusion body. Under unheated conditions, the NTSC color gamut is promoted from 72% to 100% of the known art. In fact, when the diffused body is heat treated, the NTSC color gamut will be below 100%.
The invention patent application publication No. CN108387957A discloses a quantum dot diffusion film with high covering power and high brightness and a preparation method thereof, the quantum dot film and the diffusion film are combined into a whole, the quantum dot diffusion film comprises a quantum dot base material layer and diffusion layers coated on the upper surface and the lower surface of the base material layer, and the quantum dot base material layer is of a single-layer film structure. The quantum dot substrate layer can provide high luminance of the backlight module, the diffusion layer can play a role in correcting the light diffusion angle, and when light of the light source passes through diffusion particles on the diffusion film, light can be refracted, reflected and scattered on the surface, so that the light of the backlight source is diffused softly and uniformly. The quantum dot diffusion film is of a sandwich-like structure of a three-layer film composite system formed by taking a quantum dot film base material layer as a core and coating diffusion layers on the upper surface and the lower surface of the quantum dot film base material layer respectively, the structure is biased to be the traditional quantum dot film, and the manufacturing mode of the quantum dot diffusion film is different from the extrusion molding process of the traditional diffusion plate. For the diffuser plate manufacturing enterprises, the equipment incompatibility in the new process requires the re-investment of manufacturing equipment. In addition, different from the simultaneous light diffusion and light conversion of the mixed-type quantum dot diffusion plate, the similar quantum dot diffusion film internally performs light conversion, the upper surface and the lower surface perform light diffusion, the light diffusion and refraction of colored light with different light wavelengths on the light-emitting surface generate different light refraction angles, and the mixed light has higher risk of light segregation during light emission.
The invention patent application publication number CN106918952A discloses a mixing type quantum dot diffusion plate, PS or PC or PMMA plastic particles are selected as a raw material; uniformly stirring and mixing the selected mixture of the material and the powder to prepare optical master batches; selecting 100 parts of the material, 1-25 parts of the optical master batch, 1-25 parts of GPPS (general purpose polystyrene), and 1-9 parts of quantum dots, melting and uniformly stirring the mixture in an extrusion molding machine, and molding to obtain a quantum dot diffusion plate; and cooling the quantum dot diffusion plate through the extrusion line, and cutting the quantum dot diffusion plate into a quantum dot diffusion plate finished product with the size matched with the backlight module. In such a similar mixed-in type quantum dot diffusion plate, the quantum dot material has the characteristics of being not easily dispersed and being easily disordered and agglomerated, and is difficult to achieve uniform distribution when being directly mixed into an extrusion molding machine, and is easily dissipated due to the high temperature of extrusion molding, in order to have a sufficient amount of quantum dot material in the finished quantum dot diffusion plate, the quantum dot material added in the extrusion molding needs to be additionally increased and is difficult to stably control the final residual amount due to the parameter of the process, for example, the amount of the quantum dot material accounts for 1-9% of the amount of the raw material of the diffusion plate.
The invention patent application publication No. CN107011532A discloses a quantum dot diffusion plate manufacturing process and a diffusion plate, wherein the quantum dot diffusion plate comprises a plate body and a water-oxygen barrier layer coated on the outer surface of the plate body, and quantum dots and a light diffusant are uniformly dispersed in the plate body, and the quantum dot diffusion plate manufacturing process comprises the following steps of 1: solution blending, namely dissolving two kinds of quantum dots, namely red quantum dots and green quantum dots, in an organic solvent to form a QD-MMA solution; adding a light diffusant into the solution, stirring and ultrasonically vibrating to uniformly disperse the light diffusant into the solution; step 2: drying the solution, adding dibenzoyl peroxide (BPO), adding a proper amount of anhydrous calcium chloride, removing water and drying; and step 3: preparing pre-polymerized raw pulp, performing pre-polymerization, performing water bath reflux, controlling the temperature to be 80 ℃ until viscous thin pulp is formed, and cooling the viscous thin pulp to room temperature to obtain the pre-polymerized raw pulp; and 4, step 4: injecting the prepolymerization protoplasm into a mould, expelling bubbles and sealing the mould opening; and 5: baking and polymerizing to form PMMA, polymerizing the grouted mould at low temperature in an oven at 50 ℃, heating to 100 ℃ when the polymer in the mould becomes solid basically, and keeping for 2 hours to form polymethyl methacrylate (PMMA) with quantum dots and light diffusant uniformly distributed in the mould; step 6: separating the molded PMMA from the mold, slowly cooling the polymer and the mold molded in the step 5 to 50-60 ℃, and disassembling the mold to obtain a completely cured polymethyl methacrylate (PMMA) sample plate; step 7, manufacturing a diffusion plate body, namely cutting the polymethyl methacrylate (PMMA) sample plate which is manufactured in the step 6 and is uniformly distributed with the quantum dots and the light diffusant to form the diffusion plate body; and 8: and preparing a water-oxygen barrier layer, uniformly coating a water-oxygen barrier material on the outer surface of the diffusion plate body, and curing to obtain a finished diffusion plate. In the similar mixed-type quantum dot diffusion plate, injection molding grouting of low-temperature baking polymerization is adopted, molds with various sizes are required to be prepared in the manufacturing process, and the disassembling process of the molds needs to be carried out, so that the red quantum dots and the green quantum dots can randomly escape in the quantum dot diffusion plate under the high-temperature environment of the finished product in the use occasion, and the red quantum dots and the green quantum dots cannot be uniformly distributed or are easy to generate variation under the high-temperature environment.
Disclosure of Invention
The invention mainly aims to provide a quantum dot diffusion plate for preventing quantum dots from being heated and dissipated, and mainly aims to solve the problem that the quantum dots are easy to be heated and dissipated, so that quantum dot materials can bear the high-temperature environment in the product use or/and production process and can be more stably frozen in a light-transmitting diffusion plate body at high temperature.
The invention mainly aims to provide a manufacturing method of the quantum dot diffusion plate, which is used for manufacturing the high-color-gamut high-temperature-resistant quantum dot diffusion plate. The invention also provides a backlight module using the quantum dot diffusion plate and a display screen module using the backlight module.
The main purpose of the invention is realized by the following technical scheme:
the quantum dot diffusion plate comprises a light-transmitting diffusion plate body and a plurality of pre-sealed diffusion colloidal particles dispersed in the light-transmitting diffusion plate body, wherein the pre-sealed diffusion colloidal particles comprise light-transmitting plastic and light diffusants dispersed in the light-transmitting plastic, the pre-sealed diffusion colloidal particles further comprise light reflecting agents and quantum dot bodies, the pre-sealed diffusion colloidal particles are uniformly distributed in the light-transmitting diffusion plate body, the light diffusants are uniformly distributed in the light-transmitting plastic, and the quantum dot bodies are non-uniformly distributed in the light-transmitting plastic through the light reflecting agents; when the quantum dot diffusion plate is used for a QD-LCD display product, the color saturation is more than 110 percent and the color gamut is more than 110 percent NTSC after the baking process of baking for 4 hours at 150 ℃ or/and baking for 1 hour at 230 ℃.
By adopting the technical scheme, quantum dot bodies in the pre-sealed diffusion colloidal particles are distributed in a heterogeneous manner in the light-transmitting plastic through the light reflecting agent and are distributed in a homogeneous manner in the light-transmitting diffusion plate body, the quantum dot bodies can be enabled to have an orderly aggregation form in the pre-sealed diffusion colloidal particles, part of monochromatic light of a light source is converted into other colored light, the other part of monochromatic light is not converted, the conversion and the non-conversion of the colored light are homogenized based on the distribution of the light reflecting agent, the luminous color gamut can be improved without increasing the use amount of the quantum dot bodies, the uniform light mixing effect is still kept, the heat dissipation amount of the quantum dot bodies can be reduced under the condition that the use amount of the quantum dot bodies is not increased, compared with the traditional quantum dot or diffusion plate and the traditional quantum dot film, the quantum dot bodies can be buried in the diffusion plate deeply by a physical insulation means, and the quantum dot bodies are sealed in advance by the pre-sealed diffusion colloidal particles, the extrusion molding of the light-transmitting diffusion plate body is facilitated when the pre-sealed diffusion colloidal particles are mixed, the agglomerated dots of the quantum dot body are regularly distributed in the light-transmitting diffusion plate body in a homogeneous mode by taking the colloidal particles as units, and the heat dissipation of the quantum dot body can be reduced.
The invention may in a preferred example be further configured to: when the light-transmitting diffusion plate body is extruded and molded, the upper surface and the lower surface of the light-transmitting diffusion plate body are respectively coated with an anti-escape surface glue layer, and preferably, the light reflecting agent adsorbs the quantum dot body on the periphery or inside of the light reflecting agent.
By adopting the preferable technical characteristics, the quantum dot bodies are sealed in advance except for the pre-sealed diffusion colloidal particles, the plate is internally pre-sealed and isolated to serve as a first protection mechanism for preventing heat dissipation, the anti-dissipation surface glue layers are coated on the upper surface and the lower surface of the light-transmitting diffusion plate body to isolate the quantum dot bodies, the plate surface isolation manner is used as a second protection mechanism for preventing heat dissipation, preferably, the quantum dot bodies are adsorbed by using a light reflecting agent, the intra-colloidal particle adsorption manner is used as a third protection mechanism for preventing heat dissipation, and tests show that the quantum dot bodies in the quantum dot light diffusion plate type products have obvious effect on preventing heat dissipation, and the quantum dot bodies are favorably distributed in a more heterogeneous manner in the light-transmitting plastic.
The invention may in a preferred example be further configured to: the material of the light-transmitting plastic or/and the light-transmitting diffusion plate body comprises polystyrene, the refractive index of the light-transmitting plastic is larger than or equal to that of the light-transmitting diffusion plate body, and preferably, the upper surface and the lower surface of the light-transmitting diffusion plate body are provided with different concave-convex light scattering patterns.
By adopting the preferable technical characteristics, the light diffusion effect of the refraction mode is increased or maintained by utilizing the refractive index of the light-transmitting plastic pre-sealed with the diffusion colloidal particles to be more than or equal to that of the light-transmitting diffusion plate body according to the refractive index difference inside the material. Preferably, the upper surface and the lower surface of the light-transmitting diffusion plate body are provided with different concave-convex light scattering patterns, and the light diffusion effect of the refraction mode is increased by adjusting the patterns on the surface of the diffusion plate body. Specifically, when the lower surface of the light-transmitting diffuser plate is used as the light-entering surface and the upper surface thereof is used as the light-exiting surface, the light diffusing effect is better when the unevenness of the uneven light-diffusing pattern on the lower surface is more pronounced and the difference between the two surface patterns is larger.
The invention may in a preferred example be further configured to: the pre-sealed diffusion colloidal particle further comprises brilliant powder, the light reflecting agent is titanium dioxide, and the pre-sealed diffusion colloidal particle comprises 80-90% of polystyrene raw material, 1-3% of light diffusing agent, 2-5% of titanium dioxide, 2-5% of quantum dot material and 1-3% of brilliant powder by mass, and preferably further comprises 0.5-2% of antioxidant and 0.5-2% of anti-ultraviolet agent.
The specific proportioning range of the pre-encapsulated diffusion colloidal particles can be utilized by adopting the above preferred technical characteristics, and the pre-encapsulated diffusion colloidal particles simultaneously have various functions of light refraction, light reflection and homogenized partial light color (light wavelength) conversion, and preferably also have a function of violet light isolation. When the proportion and the dosage of the titanium dioxide and the quantum dot material are in positive correlation, the titanium dioxide plays a stable adsorption role for the quantum dot material, and disordered and harmful heterogeneous distribution of the quantum dot material cannot occur.
The invention may in a preferred example be further configured to: the pre-sealed diffusion colloidal particles account for less than 5% of the light-transmitting diffusion plate body by mass, and the quantum dot materials account for less than 0.25% of the light-transmitting diffusion plate body by mass, preferably 0.04-0.2%.
By adopting the preferable technical characteristics, the specific proportion limit of the pre-sealed diffusion glue and the quantum dot material is utilized, the problem of color saturation weakening or color gamut recession can be avoided when the high-temperature condition in specific use or manufacture is used and a traditional quantum dot diffusion plate or/and a traditional quantum dot film is used, and the color saturation and color gamut performance are higher compared with an OLED product.
The invention may in a preferred example be further configured to: the quantum dot body comprises a blue-to-red light quantum dot material and a blue-to-yellow-green light quantum dot material, the particle sizes of the blue-to-yellow-green light quantum dot material and the blue-to-yellow-green light quantum dot material are smaller than 10nm, the particle size of the blue-to-yellow-green light quantum dot material is smaller than that of the blue-to-red light quantum dot material, preferably, the quantum dot body is provided with a cadmium core coated with a plurality of isolation film layers, and the cadmium concentration of the quantum dot body is 50-70% under the detection of a reaction coupling plasma emission spectrometer.
By adopting the preferable technical characteristics, the quantum dot body comprises blue-to-red light quantum dot materials, blue-to-yellow-to-green light quantum dot materials and particle size definition, and under the irradiation of blue light beads, white or uniform mixed light close to white can be emitted after penetrating through the quantum dot diffusion plate. The particle size difference of the quantum dot bodies does not influence the aggregation points of the quantum dot bodies to present regular homogeneous distribution in the light-transmitting diffusion plate body by taking colloidal particles as units.
The invention may in a preferred example be further configured to: the quantum dot diffusion plate further comprises an anti-escape edge-covering adhesive layer which is coated on the cut side edge of the light-transmitting diffusion plate body after extrusion molding, preferably, the anti-escape edge-covering adhesive layer is provided with a curved surface, and preferably, quantum dot materials are not mixed in both the anti-escape edge-covering adhesive layer and the anti-escape surface adhesive layer.
By adopting the preferable technical characteristics, the anti-escape edge-covering glue layer is coated on the cut side edge of the light-transmitting diffusion plate body after extrusion molding, so that the quantum dot body is prevented from being heated and dissipated by the cut side edge of the light-transmitting diffusion plate body, and the side edge of the plate is coated and isolated to serve as a fourth protection mechanism for preventing from being heated and dissipated. Preferably, the light reflection ratio of the side edge of the diffusion plate is increased by using the curved surface of the anti-escape edge-covering glue layer, so that the refraction light leakage of light emitted from the side edge is reduced. Preferably, the quantum dot material is not mixed into the anti-escape edge-covering adhesive layer and the anti-escape surface adhesive layer, so that the using amount and the heat dissipation amount of the quantum dot material are reduced.
The main purpose of the invention is realized by the following technical scheme:
the manufacturing method of the quantum dot diffusion plate is used for manufacturing the quantum dot diffusion plate for preventing quantum dots from being heated and dissipated, and comprises a granulation process for manufacturing the pre-sealed diffusion colloidal particles and an extrusion molding process for manufacturing the light-transmitting diffusion plate body in sequence, preferably, in the granulation process, raw material stocks of the pre-sealed diffusion colloidal particles including the quantum dot bodies are filled into a melting material barrel, are uniformly stirred by a vacuum high-speed stirrer and are cut into granules by an automatic cutting knife after being solidified, preferably, in the extrusion molding process, the granular pre-sealed diffusion colloidal particles and raw materials of the light-transmitting diffusion plate body are mixed and stirred in a charging hopper, and then the mixture is extruded and rolled into a sheet by an extrusion screw and an extrusion model to manufacture the light-transmitting diffusion plate body mixed with the pre-sealed diffusion colloidal particles, and preferably, the manufacturing method also comprises the step of performing an edge covering process after the light-transmitting diffusion plate body is extruded and cut into pieces, and coating the anti-escape edge covering glue layer on the cut side edges of the light-transmitting diffusion plate body.
By adopting the technical scheme, the granulating procedure before the diffuser plate extrusion molding procedure is utilized, the quantum dot body and the diffusant are pre-packaged in the pre-packaged diffusion colloidal particle, the quantum dot body with smaller particle size can not be accumulated in the specific part of the diffuser plate in the extrusion molding process, the agglomerated dots of the quantum dot body are uniformly distributed in the light-transmitting diffuser plate body by taking the colloidal particle as a unit, and meanwhile, the heat resistance and the dissipation resistance of the quantum dot body are improved. Preferably, the quantum dots can be mixed in the light-transmitting plastic without voids by using a vacuum high speed stirrer and an automatic cutting blade used in the granulation process to prepare the pre-encapsulated diffusion beads. Preferably, the pre-sealed diffusion colloidal particles and the raw material of the light-transmitting diffusion plate body are uniformly mixed in the charging hopper by utilizing the mixing and stirring, the extrusion screw and the extrusion model in the charging hopper used in the extrusion molding process, so as to prepare the light-transmitting diffusion plate body mixed with the pre-sealed diffusion colloidal particles. Preferably, the mirror surface roller, the frosted surface roller and the roller carved with the finer frosted surface are sequentially included according to the discharging direction by utilizing the extrusion model so as to obtain the uneven light scattering patterns with different upper and lower surfaces of the light-transmitting diffusion plate body, the wheel surface of the frosted surface roller is used for finishing the shape of the deeper uneven light scattering patterns, and then the wheel surface of the roller carved with the finer frosted surface is used for finishing the shape of the shallower uneven light scattering patterns, so that the deeper uneven light scattering patterns are relatively complete in shape and have no material extruding defect. Preferably, the edge covering process after the diffusion plate extrusion molding process is utilized, so that the whole surface of the light-transmitting diffusion plate body is completely and comprehensively isolated by the anti-escape surface adhesive layer and the anti-escape edge covering adhesive layer together, and the quantum dot body is completely prevented from escaping.
The other purposes of the invention are realized by any one of the following technical solutions:
a backlight module is provided, which includes: preferably, the backlight module further comprises an array blue light bead arranged below the quantum dot diffusion plate, a reflection layer used for reflecting light emitted by the blue light bead and reflected light of the quantum dot diffusion plate, and at least one layer of brightness enhancement film arranged on the quantum dot diffusion plate.
Still can propose a display screen module, include: the backlight module and the display screen panel on the backlight module are provided.
In summary, the present invention includes at least one of the following technical effects that contribute to the prior art:
1. the quantum dot diffusion plate can bear high temperature of the manufacturing process or/and a higher temperature environment of the use environment, and is applied to QD-LCD display products without the problems of color saturation attenuation or/and color gamut recession;
2. the method can achieve higher and better color saturation and color gamut expression under the condition of not increasing the using amount of the quantum dot body, or can reduce the using amount of the quantum dot body under the same color saturation and color gamut expression;
3. the manufactured quantum dot diffusion plate has the effect of preventing the quantum dots from being heated and scattered.
Drawings
FIG. 1 is a schematic cross-sectional view of a quantum dot diffusion plate for preventing quantum dots from being scattered by heat according to some embodiments of the present invention;
FIG. 2 is an enlarged schematic view of an end portion of the quantum dot diffusion plate in the labeled region of FIG. 1;
FIG. 3 is an enlarged view of particles of pre-encapsulated diffusion particles mixed into a quantum dot diffuser in accordance with some preferred embodiments of the present invention;
FIG. 4 is a schematic diagram of a product structure using a quantum dot diffusion plate according to some preferred embodiments of the invention;
FIG. 5 is a schematic flow chart illustrating a method of fabricating a quantum dot diffuser plate according to some embodiments of the present disclosure;
FIG. 6 shows an embodiment of the granulation process S1 of FIG. 5;
FIG. 7 is a schematic diagram showing an embodiment of the extrusion molding process S2 of FIG. 5;
FIG. 8 is a schematic diagram of the hopper mixing and stirring pre-encapsulated dispersion crumb shown in the extrusion process performance of FIG. 7;
fig. 9 is a schematic diagram of an extrusion die roll-formed light-transmissive diffuser plate in the extrusion process performance of fig. 7.
The reference number is 10, a quantum dot diffusion plate, 11, a light-transmitting diffusion plate body, 12, pre-sealed diffusion colloidal particles, 121, light-transmitting plastic, 122, light diffusion agent, 123, light reflection agent, 124, a quantum dot body, 13, an anti-escape surface adhesive layer, 14, an anti-escape surface adhesive layer, 15, an anti-escape edge adhesive layer, 16, a concave-convex light scattering pattern, 17, a curved surface, 21, a blue light bead, 22, a reflection layer, 23, a brightness enhancement film, 30, a display screen panel, 41, a melting material barrel, 42, a vacuum high-speed stirrer, 51, a charging hopper, 52, a main hopper, 53, an extrusion screw, 54, an extrusion model, a mirror surface roller, 542, a frosted surface roller, 543, a roller engraved with a fine frosted surface, 55, a feeding hopper, 56, a packaging applicator, 57, a cooling device, 58, an inspection device, 59, a film pressing device, 60 and the like, Trimming device, 61 transplanting device, 62 gear pump, 63 net changing device.
Detailed Description
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 only a part of embodiments for understanding the inventive concept of the present invention, and do not represent all embodiments, nor do they explain only embodiments. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention under the understanding of the inventive concept of the present invention are within the protection scope of the present invention.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture, and if the specific posture is changed, the directional indications are changed accordingly. In order to facilitate understanding of the technical solution of the present invention, the following examples further describe and explain the quantum dot diffusion plate, the manufacturing method and the backlight module for preventing the quantum dots from dissipating due to heat, but do not limit the scope of the present invention. The term "homogeneous distribution" in the following embodiments refers to that the object is not agglomerated, for example, three or more pre-encapsulated diffusion particles 12 are dispersed in fig. 2 and are not in collision contact with each other in the light-transmitting diffusion plate 11, and three or more light-reflecting agents 123 are not in collision contact with each other in the light-transmitting plastic 121 of the pre-encapsulated diffusion particles 12. The term "heterogeneous distribution" in the following examples refers to the condition when the aggregation phenomenon occurs in the designated objects or the part of the amount of the aggregation phenomenon is orderly aggregated, for example, three or more quantum dot bodies 124 are aggregated in the light reflective agent 123 in fig. 3 to present a regular and heterogeneous distribution.
Fig. 1 is a schematic cross-sectional view of a quantum dot diffusion plate 10 for preventing quantum dots from being scattered by heat according to some embodiments of the present invention, fig. 2 is an enlarged view of an end portion of the quantum dot diffusion plate 10 in a marked region of fig. 1, and fig. 3 is an enlarged view of particles of pre-encapsulated diffusion colloidal particles 12 mixed in the quantum dot diffusion plate 10 according to some preferred embodiments of the present invention. The figures illustrate only the common features of the various embodiments, and the differences or differences are described in text or compared to the drawings, for example, the pre-sealed diffusion beads 12 in fig. 3 may be in the form of a square, a bar, an ellipse or other shapes that are cut out, although they are in the form of a ball. Therefore, based on the industrial characteristics and technical essence, those skilled in the art should correctly and reasonably understand and judge whether the individual technical features or any combination of a plurality of the technical features described below can be represented in the technical solution of the same embodiment, or whether a plurality of technical features mutually exclusive in technical essence can be represented in different technical solutions of different variant embodiments.
Referring to fig. 1 and 2, a quantum dot diffusion plate 10 for preventing quantum dots from being dissipated by heating disclosed in some embodiments of the present invention includes a light-transmitting diffusion plate body 11 and a plurality of pre-encapsulated diffusion colloidal particles 12 dispersed in the light-transmitting diffusion plate body 11, and referring to fig. 3, the pre-encapsulated diffusion colloidal particles 12 include a light-transmitting plastic 121 and a light diffusing agent 122 dispersed in the light-transmitting plastic 121, the pre-encapsulated diffusion colloidal particles 12 further include a light reflecting agent 123 and a quantum dot body 124, wherein referring to fig. 2 and 3, the pre-encapsulated diffusion colloidal particles 12 are homogeneously distributed in the light-transmitting diffusion plate body 11, the light diffusing agent 122 is homogeneously distributed in the light-transmitting plastic 121, and the quantum dot body 124 is heterogeneously distributed in the light-transmitting plastic 121 through the light reflecting agent 123; when the quantum dot diffusion plate 10 is used in a QD-LCD display product (one specific structure is shown in fig. 4), the color saturation is above 110% and the color gamut is above 110% NTSC after baking processes of 150 ℃ for 4 hours or/and 230 ℃ for 1 hour.
The implementation principle of the embodiment is as follows: by utilizing the non-homogeneous distribution of the quantum dot bodies 124 in the pre-sealed diffusion colloidal particles 12 in the light-transmitting plastic 121 through the light reflecting agent 123 and the homogeneous distribution of the pre-sealed diffusion colloidal particles 12 in the light-transmitting diffusion plate body 11, the quantum dot bodies 124 can be enabled to have the orderly aggregation state in the pre-sealed diffusion colloidal particles 12, part of monochromatic light of a light source is converted into other color light without converting the other part of monochromatic light, the conversion and the non-conversion of the color light are homogenized based on the distribution of the light reflecting agent 123, the luminous color gamut can be improved without increasing the usage amount of the quantum dot bodies 124, and the uniform light mixing effect is still kept, in addition, the heat dissipation amount of the quantum dot bodies 124 can be reduced without increasing the usage amount of the quantum dot bodies 124, compared with the traditional quantum dot diffusion plate 10 or/and the traditional quantum dot film, the isolation means which can have physical resistance of the quantum dot bodies 124 are deeply buried in the diffusion plate, and the quantum dot bodies 124 are pre-sealed diffusion colloidal particles 12 in advance, the extrusion molding of the light-transmitting diffusion plate body 11 is facilitated when the pre-sealed diffusion colloidal particles 12 are mixed, the agglomerated dots of the quantum dot bodies 124 are regularly distributed in the light-transmitting diffusion plate body 11 in a uniform phase mode by taking the colloidal particles as units, and the heat dissipation of the quantum dot bodies 124 can be reduced.
Regarding the selection of the materials of the light-transmitting diffusion plate 11 and the light-transmitting plastic 121 and the specific examples, in a preferred example, the material of the light-transmitting plastic 121 or/and the light-transmitting diffusion plate 11 includes polystyrene, the refractive index of the light-transmitting plastic 121 is greater than or equal to the refractive index of the light-transmitting diffusion plate 11, and preferably, the upper and lower surfaces of the light-transmitting diffusion plate 11 have different concave-convex light scattering patterns 16. In terms of material change, the material of the transparent plastic 121 may also be other transparent materials different from the transparent diffusion plate 11, specifically, the transparent plastic 121 may be silica gel different from the transparent diffusion plate 11, in the manufacturing process, before the transparent diffusion plate 11 is cured, the curing temperature of the transparent plastic 121 is equal to or less than the curing temperature of the transparent diffusion plate 11, and in the characteristic, the refractive index of the transparent plastic 121 is equal to or greater than the refractive index of the transparent diffusion plate 11.
Therefore, the refractive index of the light-transmitting plastic 121 encapsulating the diffusion colloidal particles 12 is greater than or equal to that of the light-transmitting diffusion plate 11, so that the light diffusion effect of the refraction mode is increased or maintained by the refractive index difference inside the material. Preferably, the upper and lower surfaces of the light-transmitting diffuser plate 11 have different uneven light scattering patterns 16, and the light scattering effect of the refraction mode is increased by adjusting the patterns on the surface of the diffuser plate. Specifically, when the lower surface of the light-transmitting diffuser plate 11 is a light-entering surface and the upper surface is a light-exiting surface, the light diffusing effect is better when the unevenness of the uneven light scattering pattern 16 on the lower surface is more pronounced and the difference between the two surface patterns is larger.
As a specific example of the light diffusing agent 122 and the light reflecting agent 123, a conventional light diffusing agent can be selected for diffusing light in a refraction manner, and generally has a light transmitting property, and the refractive index of the light diffusing agent 122 is larger than that of the light transmitting plastic 121. The light reflecting agent 123 is used for diffusing light in a reflecting manner, generally has an opaque characteristic, and can shield a direct type LED lamp shadow to make the luminosity of a display image uniform, and the light reflecting agent 123 is specifically titanium dioxide.
For the specific illustration of the quantum dot body 124, in a preferred example, the quantum dot body 124 includes a blue-to-red light quantum dot material and a blue-to-yellow-green light quantum dot material, both of which have a particle size of less than 10nm, wherein the particle size of the blue-to-yellow-green light quantum dot material is also less than that of the blue-to-red light quantum dot material, specifically, the particle size of the blue-to-yellow-green light quantum dot material is between 3 nm and 4 nm, and the particle size of the blue-to-red light quantum dot material is about 7 nm. Preferably, the quantum dot body 124 has a cadmium core coated with a plurality of isolation films, and the cadmium concentration of the quantum dot body 124 is 50-70%, specifically 60.3%, under the detection of a reaction coupled plasma emission spectrometer.
Therefore, under the irradiation of the blue light beads, the quantum dot body 124 including the blue-to-red light quantum dot material, the blue-to-yellow-to-green light quantum dot material and the particle size definition can emit a white or nearly white uniform mixed light after passing through the quantum dot diffusion plate 10. The particle size difference of the quantum dot bodies 124 does not affect the regular homogeneous distribution of the agglomerated dots of the quantum dot bodies 124 in the light-transmitting diffuser plate body 11 by taking colloidal particles as units.
Regarding the specific example proportion of the pre-encapsulated diffusion colloidal particles 12, in a preferred example, the pre-encapsulated diffusion colloidal particles 12 further include showy powder, and the mass percentage of the pre-encapsulated diffusion colloidal particles 12 includes 80-90% of polystyrene raw material, 1-3% of light diffusant, 2-5% of titanium dioxide, 2-5% of quantum dot material, and 1-3% of showy powder, and preferably, the proportion further includes 0.5-2% of antioxidant and 0.5-2% of anti-ultraviolet light agent. In a specific proportioning example of the pre-encapsulated diffusion colloidal particle 12, the pre-encapsulated diffusion colloidal particle comprises 87 mass percent of polystyrene raw material, 2 mass percent of light diffusant, 3 mass percent of titanium dioxide, 3 mass percent of quantum dot material, 2 mass percent of bright yellow powder, 1 mass percent of antioxidant and 1 mass percent of ultraviolet resistant agent.
The bright Powder is a Powder material for improving Optical brightness, is equivalent to brightening agent Powder used in the Optical field, and is called Optical bright Powder or fluorescent whitening Powder in English. Reference is made to optical brightening agent (optical whitening agent) available from the company treeder. In the embodiment, the specific functions of the yangxi powder are to realize the light refraction of the material interface, the light reflection of the titanium dioxide, the homogenization of the light diffuser, and the light color conversion of the quantum dot material in the pre-encapsulated diffusion colloidal particles 12, so as to maintain the optical brightness of the colloidal particles and reduce the light decay. The light entering the pre-sealed diffusion colloidal particles 12 does not produce significant light absorption compared to the light not entering the pre-sealed diffusion colloidal particles 12, and the color saturation of the light entering the pre-sealed diffusion colloidal particles 12 is considerably facilitated under the condition that the color gamut is enlarged. The brilliant powder is uniformly distributed in the pre-sealed diffusion colloidal particles 12 and is non-uniformly distributed in the light-transmitting diffusion plate body 11, namely the brilliant powder is concentrated in the pre-sealed diffusion colloidal particles 12.
Therefore, with the specific proportioning range of the pre-encapsulated diffusion colloidal particles 12, the pre-encapsulated diffusion colloidal particles 12 simultaneously have various functions of light refraction, light reflection, and homogenized partial light color (light wavelength) conversion, and preferably also have a function of violet light isolation. When the proportion and the dosage of the titanium dioxide and the quantum dot material are in positive correlation, the titanium dioxide plays a stable adsorption role for the quantum dot material, and disordered and harmful heterogeneous distribution of the quantum dot material cannot occur.
Regarding the example proportioning relationship between the light-transmitting diffusion plate body 11 and the pre-sealed diffusion colloidal particles 12, in a preferred example, the mass percentage of the pre-sealed diffusion colloidal particles 12 in the light-transmitting diffusion plate body 11 is within 5%, and the mass percentage of the quantum dot material in the light-transmitting diffusion plate body 11 is within 0.25%, and preferably 0.04-0.2%. In a specific mixture ratio of the quantum dot diffusion plate 10, the raw material of the light-transmitting diffusion plate body 11 is 97.8%, and the pre-sealed diffusion colloidal particles are 122.2%.
Therefore, the specific proportion limit of the pre-encapsulation diffusion glue and the quantum dot material can bear the high-temperature condition in specific use or manufacture, and the problem of color saturation weakening or/and color gamut fading can not occur when the traditional quantum dot diffusion plate 10 is used or/and the traditional quantum dot film is used, compared with an OLED product, the OLED product also has higher color saturation and color gamut expression, the color saturation of the OLED product is between 80 and 100 percent under the condition of no high-temperature treatment, and the color gamut expression of the OLED product is 100 percent NTSC.
One of the further points of the present invention is that the quantum dot diffusion plate 10 can be manufactured by using the extrusion molding process of the conventional diffusion plate, and the disadvantage that the quantum dot bodies 124 are easy to be irregularly agglomerated in the diffusion plate is converted into the advantage that the quantum dot bodies are orderly agglomerated in the pre-encapsulated diffusion colloidal particles 12. In a preferred example, when the light-transmitting diffuser plate 11 is extruded, the upper and lower surfaces of the light-transmitting diffuser plate 11 are coated with anti-escape surface glue layers 13,14, and preferably, the light-reflecting agent 123 adsorbs the quantum dot bodies 124 on the periphery or inside of the light-reflecting agent 123.
Therefore, except for pre-encapsulating the quantum dot body 124 by the pre-encapsulating diffusion colloidal particles 12, the plate interior pre-encapsulating isolation mode is used as a first protection mechanism for preventing thermal dissipation, the anti-dissipation surface glue layers 13 and 14 are coated on the upper surface and the lower surface of the light-transmitting diffusion plate body 11 to isolate the quantum dot body 124, the plate surface isolation mode is used as a second protection mechanism for preventing thermal dissipation, preferably, the light reflecting agent 123 is used for adsorbing the quantum dot body 124, the colloidal particle internal adsorption mode is used as a third protection mechanism for preventing thermal dissipation, tests show that the quantum dot body 124 can be obviously prevented from thermal dissipation in the products of the quantum dot light diffusion plate type, and the quantum dot body 124 can be favorably distributed in the light-transmitting plastic 121 in a more ordered heterogeneous mode.
In a preferred example, referring to fig. 2 again, the quantum dot diffusion plate 10 further includes an anti-escape edge-covering adhesive layer 15 coated on the cut side edge of the light-transmitting diffusion plate body 11 after extrusion molding, preferably, the anti-escape edge-covering adhesive layer 15 has a curved surface 17, and preferably, neither the anti-escape edge-covering adhesive layer 15 nor the anti-escape surface adhesive layers 13 and 14 is mixed with quantum dot material.
Therefore, the anti-dissipation edge-covering adhesive layer 15 is coated on the cut side of the light-transmitting diffusion plate 11 after extrusion molding, so as to prevent the quantum dot body 124 from being heated and dissipated from the cut side of the light-transmitting diffusion plate 11, and the plate side is used as a fourth protection mechanism for preventing from being heated and dissipated in an isolation manner. Preferably, the curved surface 17 of the anti-escape edge-covering glue layer 15 is used to increase the light reflection ratio of the side edge of the diffusion plate, thereby reducing the refraction light leakage of the light emitted from the side edge. Preferably, the quantum dot material is not mixed into the anti-escape edge-covering adhesive layer 15 and the anti-escape surface adhesive layers 13 and 14, so that the using amount and the heat dissipation amount of the quantum dot material are reduced.
Fig. 4 is a schematic diagram illustrating a product structure using the quantum dot diffusion plate 10 according to some preferred embodiments of the invention. Referring to fig. 4, some embodiments of the present invention provide a backlight module, including: in any of the above technical solutions, the quantum dot diffusion plate 10 for preventing quantum dots from being heated and dissipated preferably further includes an array of blue light beads 21 disposed under the quantum dot diffusion plate 10, a reflection layer 22 for reflecting light emitted by the blue light beads 21 and reflected light of the quantum dot diffusion plate 10, and at least one brightness enhancement film 23 disposed on the quantum dot diffusion plate 10. The reflective layer 22 is specifically a reflective base with reflective hypotenuses formed at the periphery.
Referring to fig. 4 again, some embodiments of the present invention further provide a display screen module, including: the backlight module and the display screen panel 30 located on the backlight module according to the above technical solution are provided. The display screen panel 30 is in particular a glass screen, for example an LCD display panel. The display screen module is a QD-LCD display product, and a light source of the display screen module is a Mini LED, or the quantum dot diffusion plate 10 can be applied to a Micro LED display device after being microminiaturized and cut in different examples.
The optical principle of the display screen module is as follows:
1. the light emitted by the lamp beads 21 is incident on the anti-escape surface adhesive layer 13 on the lower surface of the quantum dot diffusion plate 10 and enters the V-shaped structure surface of the concave-convex light scattering pattern 16 to be refracted at multiple angles, and part of the light reflected by the catadioptric light source is incident on the reflecting layer 22 to be subjected to light diffusion and light reflection on the incident surface;
2. the reflection layer 22 reflects the light source and then enters the light-transmitting diffusion plate body 11 of the quantum dot diffusion plate 10, and part of the light passes through the surface pattern frosted surface and the anti-escape surface adhesive layer 14 on the upper surface of the quantum dot diffusion plate 10 to perform light diffusion on the light-emitting surface so as to uniformly diffuse and emit the light source;
3. the part of the refraction and diffusion light source entering the light-transmitting diffusion plate body 11 is uniformly diffused and light is converted into another color light through the pre-sealed diffusion colloidal particles 12, and then enters the light-adding layer 23, the part of the refraction and diffusion light source does not remain the original color light through the pre-sealed diffusion colloidal particles 12, the pre-sealed diffusion colloidal particles 12 can be kept in homogeneous distribution in the extrusion molding process, the internal quantum dot body 124 cannot be scattered due to the high temperature of extrusion molding based on the solidification and freeze action of the light-transmitting plastic 121 and the grabbing action of the light reflecting agent 123, and the light mixing effect of high color gamut is realized;
4. the brightness enhancement film 23 refracts and brightens brightness by the principle of the base layer;
5. the brightness enhancement film 23 brightens the light source to illuminate the screen through the brightness of the display screen panel 30;
6. the quantum dot effect is achieved by directly matching quantum dot ions in the quantum dot diffusion plate 10, and the advantages include but are not limited to: low cost (reduced use of quantum dot film or quantum dot material), high temperature resistance (ability to withstand baking temperatures above 150 ℃ without changing color gamut and color saturation), and high color gamut (above 110% NTSC).
In addition, fig. 5 is a schematic flow chart illustrating a manufacturing method of the quantum dot diffusion plate 10 according to some embodiments of the invention; FIG. 6 shows an embodiment of the granulation process S1 of FIG. 5; FIG. 7 is a schematic diagram showing an embodiment of the extrusion molding process S2 of FIG. 5; FIG. 8 is a schematic diagram showing the extrusion process of FIG. 7, in which the charging hopper 51 mixes and stirs the pre-encapsulated diffusion beads 12; fig. 9 is a schematic diagram of the extrusion mold 54 roll-formed into the light-transmitting diffuser plate body 11 in the extrusion molding process performance of fig. 7.
In another embodiment of the present invention, a method for manufacturing a quantum dot diffusion plate 10 corresponding to the quantum dot diffusion plate 10 for preventing thermal dissipation of quantum dots is provided, the method is used for manufacturing the quantum dot diffusion plate 10 for preventing thermal dissipation of quantum dots according to any of the above-mentioned technical solutions, and referring to fig. 5, the method sequentially includes a granulating process S1 for manufacturing the pre-encapsulated diffusion colloidal particles 12 and an extrusion molding process S2 for manufacturing the light-transmitting diffusion plate body 11, and preferably, the method further includes a taping process S3.
In a preferred example, step S1, referring to fig. 6, the raw material components of the pre-encapsulated dispersion colloidal particles 12 including the quantum dot bodies 124 are loaded into a melting tank 41, uniformly stirred by a vacuum high speed stirrer 42 to form the quantum dot dispersion pigment shown in fig. 6, and then solidified and cut into particles with a size suitable for the extrusion molding process by an automatic cutting knife. In a specific example, the vacuum high speed mixer 42 is used for stirring uniformly for 30min, the automatic cutting knife is arranged in the loading area, and the storage of the particles after cutting is kept for at least 24 hours as a preferable condition, so as to facilitate the stable curing of the pre-sealed diffusion colloidal particles 12. The quantum dot body 124 includes a shell structure, such as ZnS, ZnSe, or CdS, which covers a core structure, in addition to a cadmium source core structure, such as CdSe, and a ligand structure may be disposed at the periphery of the shell structure.
In a preferred example, in step S2, referring to fig. 7 and 8, the raw materials of the particulate pre-sealed diffusion colloidal particles 12 and the light-transmitting diffusion plate 11 are mixed and stirred in the charging hopper 51, the mixture is extruded and rolled into a sheet by the extrusion screw 53 and the extrusion mold 54 to obtain the light-transmitting diffusion plate 11 mixed with the pre-sealed diffusion colloidal particles 12, and then the anti-slip surface glue layers 13 and 14 are coated on the upper and lower surfaces of the light-transmitting diffusion plate 11, wherein the extrusion mold 54 preferably comprises a mirror surface roller 541, a frosted surface roller 542 and a roller 543 engraved with a finer frosted surface in sequence according to the discharging direction. Referring to fig. 9, the deep concave-convex light scattering pattern 16 on the lower surface of the light-transmitting diffuser plate 11 is formed by rolling a frosted surface roller 542, and the shallow light scattering pattern on the upper surface of the light-transmitting diffuser plate 11 is formed by rolling a roller 543 engraved with a fine frosted surface. The mirror surface roller 541 helps the diffusion plate raw material to fill the frosted surface roller 542 to form the deeper concave convex light scattering pattern 16, and then the frosted surface roller 542 helps the diffusion plate to form the shallower light scattering pattern on the upper surface of the diffusion plate, so that the longest time for the diffusion plate raw material to be extruded by the frosted surface roller 542 in this sequence is beneficial to forming the integrity of the concave convex light scattering pattern 16.
In a preferred example, in step S3, a hemming process is performed to coat an anti-slip hemming adhesive layer 15 on the trimmed side edges of the light-transmitting diffusion plate 11 after the light-transmitting diffusion plate 11 is extrusion molded and cut into sheets.
The implementation principle of the embodiment is as follows: the quantum dot bodies 124 are pre-encapsulated in the pre-encapsulated diffusion colloidal particles 12 along with the diffusing agent by utilizing the granulation process before the diffusion plate extrusion molding process, so that the quantum dot bodies 124 with smaller particle sizes are not accumulated in specific parts of the diffusion plate during the extrusion molding, the agglomerated dots of the quantum dot bodies 124 are uniformly distributed in the light-transmitting diffusion plate body 11 by taking colloidal particles as units, and meanwhile, the heat resistance and the dissipation resistance of the quantum dot bodies 124 are improved. Preferably, the quantum dot bodies 124 can be mixed in the light-transmitting plastic 121 without voids by using the vacuum high-speed stirrer 42 and the automatic cutting blade used in the granulation process to prepare the pre-encapsulated diffusion beads 12. Preferably, the pre-encapsulated diffusion beads 12 and the raw material of the light-transmitting diffusion plate body 11 are uniformly mixed in the charging hopper 51 by mixing and stirring, the extrusion screw 53 and the extrusion die 54 in the charging hopper 51 used in the extrusion molding process to prepare the light-transmitting diffusion plate body 11 mixed with the pre-encapsulated diffusion beads 12. Preferably, the extrusion model 54 sequentially comprises a mirror surface roller 541, a frosted surface roller 542 and a roller 543 carved with a finer frosted surface according to the discharging direction so as to obtain the uneven light scattering patterns 16 with different upper and lower surfaces of the light-transmitting diffuser plate 11, the wheel surface of the frosted surface roller 542 completes the shape of the deeper uneven light scattering pattern 16, and then the wheel surface of the roller 543 carved with the finer frosted surface completes the shape of the shallower uneven light scattering pattern 16, so that the shape of the deeper uneven light scattering pattern 16 is relatively complete and has no material extruding defect. Preferably, the edge covering process after the diffuser plate extrusion molding process is used, so that the entire surface of the light-transmitting diffuser plate body 11 is completely and completely isolated by the anti-escape surface glue layers 13 and 14 and the anti-escape edge covering glue layer 15 together, so as to completely prevent the quantum dot body 124 from escaping.
In a preferred example, the extrusion molding process S2 may employ an extrusion molding apparatus as shown in fig. 7, wherein after the transparent diffuser plate material and the pre-sealed diffuser beads 12 are uniformly mixed in the hopper 51, a dust removing mechanism may be provided between the hopper 51 and the hopper 55 at the feeding end of the extrusion screw 53, and dust is removed after mixing and before extrusion. The mixed raw materials enter an extrusion screw 53 of a main material area to be heated and melted, the extrusion temperature in the extrusion screw 53 is about 240 +/-10 ℃, a gear pump 62 conveys the melt to a main hopper 52 above a die head of an extrusion model 54, the melt is extruded and conveyed to a three-roller drawing and molding to form a continuous flaky light-transmitting diffusion plate body 11 through the feeding of the main hopper 52 by the die head of the extrusion model 54, and a filtering screen changer 63 and a vacuum exhaust device which is closer to the discharge end of the extrusion screw 53 can be arranged between the gear pump 62 and the extrusion screw 53 to exhaust bubbles in the melt. Therefore, the escape of the quantum dot body 124 is limited by the pre-encapsulated diffusion colloidal particles 12 during the extrusion molding process. Specifically, the pre-encapsulated diffusion billet 12 remains in the pellet solid state during both the extrusion step of the extrusion screw 53 and the roll forming step of the extrusion die 54.
As a preferable example, the extrusion model 54 uses the mirror surface roller 541 as a No. 1 roller, the mirror surface roller 541 is arranged in an extrusion molding host machine and is heated and standby after being cleaned by using dust-free cloth and polishing wax, the frosted surface roller 542 is used as a No. 2 roller, the frosted surface roller 542 is also arranged in the extrusion molding host machine and is heated and standby after being cleaned by using the dust-free cloth and polishing wax, the roller 543 engraved with a fine frosted surface is used as a No. 3 roller, the roller 543 engraved with the fine frosted surface is engraved with a frosted surface, is cleaned by using the dust-free cloth and a cleaning agent and is cleaned for 2 hours, the roller 543 engraved with the fine frosted surface is arranged in the extrusion molding host machine and is heated and standby after being cleaned, the mirror surface roller 541, the frosted surface roller 542 and the roller 543 engraved with the fine frosted surface are heated incrementally, the specific temperature of the above three rollers is 90, 95, 105 ℃ in sequence, respectively corresponding to the mirror surface roller 541, the frosting surface roller 542 and the roller 543 engraved with a finer frosting surface. The three rollers in this form mainly perform the surface molding function of the light-transmitting diffuser plate 11 and manufacture a determined thickness of the finished product, in fig. 4, the light-transmitting diffuser plate 11 is a light-in surface on the lower surface of the product structure, and may be specifically located on the upper surface in the processing equipment corresponding to fig. 7, a micro-structure with a concave-convex light-scattering pattern 16 on the surface is manufactured by the frosting surface roller 542, in fig. 4, the light-transmitting diffuser plate 11 is a light-out surface on the upper surface of the product structure, and the roller 543 engraved with a fine frosting surface manufactures a concave-convex light-scattering pattern with a shallower surface by the frosting surface molding. The multi-roller with gradually increased temperature is beneficial to the leading-out and surface processing forming of the light-transmitting diffusion plate body 11.
As a preferred example, referring to fig. 7 again, the back end process of the extrusion molding process S2 further includes performing encapsulation coating on the upper and lower surfaces of the light-transmitting diffuser plate 11, providing the precursors of the anti-slip surface glue layers 13 and 14 on the surface of the light-transmitting diffuser plate 11 by the encapsulation coater 56, cooling the plate temperature after roll forming and encapsulation coating of the extrusion mold 54 by the cooling device 57, wherein the cooling device 57 can be aligned with the upper surface of the light-transmitting diffuser plate 11 after encapsulation coating, and the cooling device 57 can also be aligned with the lower surface of the light-transmitting diffuser plate 11 during encapsulation coating, after three-roll extrusion drawing of the extrusion mold 54, the cooling device 57 provides a conveyor belt cooling section of about 10 meters, and adjusts the temperature of the light-transmitting diffuser plate 11 after press molding in a specific speed transmission for back end inspection. After the inspection by the inspection device 58, the anti-slip surface adhesive layers 13 and 14 are pressed by the film pressing device 59, and the continuous board is cut into a plurality of light-transmitting diffusion board bodies 11 of separated pieces by the trimming device 60, so that the size of the large board of the light-transmitting diffusion board body 11 can be corrected and the processing allowance can be reserved. Finally, the transplanting device 61 is moved and transported together, and the loading and placing can be carried out for 48 hours for the use of the subsequent processes, for example, the coating of the preferable edge covering process S3 can be performed, and the anti-leakage edge covering glue layer 15 (as shown in fig. 1 and fig. 2) is coated on the cut side edge of the light-transmitting diffusion plate 11.
The embodiments of the present invention are merely preferred embodiments for easy understanding or implementing of the technical solutions of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes in structure, shape and principle of the present invention should be covered by the claims of the present invention.

Claims (16)

1. A quantum dot diffusion plate for preventing quantum dots from being dissipated by heating is characterized by comprising a light-transmitting diffusion plate body (11) and a plurality of pre-sealed diffusion colloidal particles (12) dispersed in the light-transmitting diffusion plate body (11), wherein the pre-sealed diffusion colloidal particles (12) comprise light-transmitting plastic (121) and light diffusant (122) dispersed in the light-transmitting plastic (121), the pre-sealed diffusion colloidal particles (12) further comprise light reflecting agent (123) and quantum dot bodies (124), the pre-sealed diffusion colloidal particles (12) are uniformly distributed in the light-transmitting diffusion plate body (11), the light diffusant (122) is uniformly distributed in the light-transmitting plastic (121), and the quantum dot bodies (124) are non-uniformly distributed in the light-transmitting plastic (121) through the light reflecting agent (123); when the quantum dot diffusion plate is used for a QD-LCD display product, the color saturation is more than 110 percent and the color gamut is more than 110 percent NTSC after the baking process of baking for 4 hours at 150 ℃ or/and baking for 1 hour at 230 ℃;
the pre-sealed diffusion colloidal particle (12) further comprises brilliant powder, the light reflecting agent (123) is titanium dioxide, and the pre-sealed diffusion colloidal particle (12) comprises 80-90% of polystyrene raw materials, 1-3% of light diffusing agents, 2-5% of titanium dioxide, 2-5% of quantum dot materials and 1-3% of brilliant powder in percentage by mass.
2. The quantum dot diffuser plate for preventing quantum dots from heat dissipation as claimed in claim 1, wherein when the light transmissive diffuser plate (11) is extruded, the upper and lower surfaces of the light transmissive diffuser plate (11) are coated with anti-dissipation surface glue layers (13,14), and the light reflective agent (123) adsorbs the quantum dot body (124) at the periphery or inside of the light reflective agent (123).
3. The quantum dot diffusion plate for preventing quantum dots from being scattered by heat according to claim 1, wherein the light-transmitting plastic (121) or/and the light-transmitting diffusion plate body (11) are made of polystyrene, the refractive index of the light-transmitting plastic (121) is greater than or equal to that of the light-transmitting diffusion plate body (11), and the upper surface and the lower surface of the light-transmitting diffusion plate body (11) are provided with different concave-convex light scattering patterns (16).
4. The quantum dot diffusion plate according to claim 1, wherein the mixture ratio further comprises 0.5-2% of an antioxidant and 0.5-2% of an anti-UV agent.
5. The quantum dot diffusion plate for preventing quantum dots from being scattered by heat according to claim 1, wherein the pre-encapsulated diffusion colloidal particles (12) account for less than 5% by mass of the light-transmissive diffusion plate body (11), and the quantum dot material accounts for less than 0.25% by mass of the light-transmissive diffusion plate body (11).
6. The quantum dot diffusion plate for preventing quantum dots from dissipating under heat as claimed in claim 5, wherein the quantum dot material accounts for 0.04-0.2% by mass of the light-transmitting diffusion plate body (11).
7. The quantum dot diffusion plate for preventing quantum dots from heat dissipation as claimed in claim 1, wherein the quantum dot body (124) comprises a blue-to-red quantum dot material and a blue-to-yellow-green quantum dot material, both having a particle size of less than 10nm, wherein the particle size of the blue-to-yellow-green quantum dot material is also less than that of the blue-to-red quantum dot material.
8. The quantum dot diffusion plate according to claim 7, wherein the quantum dot body (124) has a cadmium core coated with a plurality of barrier films, and the cadmium concentration of the quantum dot body is 50-70% under the detection of a reactive coupled plasma emission spectrometer.
9. The quantum dot diffusion plate for preventing heat dissipation of quantum dots according to any one of claims 1-8, further comprising an anti-escape edge-covering glue layer (15) coated on the cut side of the light-transmitting diffusion plate body (11) after extrusion molding.
10. The quantum dot diffusion plate for preventing quantum dots from being scattered by heat according to claim 9, wherein the anti-scattering edge-covering glue layer (15) has a curved surface (17).
11. The quantum dot diffusion plate according to claim 9, wherein the escape-proof edge-covering glue layer (15) and the escape-proof surface glue layers (13,14) are free from quantum dot material.
12. A manufacturing method of a quantum dot diffusion plate for preventing quantum dots from being scattered by heat according to any one of claims 1 to 11, the manufacturing method comprising a granulation step for preparing the pre-sealed diffusion colloidal particles (12) and an extrusion molding step for preparing the light-transmitting diffusion plate body (11) in sequence, wherein in the granulation step, raw material components of the pre-sealed diffusion colloidal particles (12) including the quantum dot body (124) are put into a melting tank (41), uniformly stirred by a vacuum high-speed stirrer (42), and cut into particles by an automatic cutting knife after solidification.
13. The method for manufacturing the quantum dot diffusion plate according to claim 12, wherein in the extrusion molding process, the raw materials of the granular pre-sealed diffusion colloidal particles (12) and the light-transmitting diffusion plate body (11) are mixed and stirred in a charging hopper (51), the mixture is extruded and rolled into a sheet by an extrusion screw (53) and an extrusion model (54) to prepare the light-transmitting diffusion plate body (11) mixed with the pre-sealed diffusion colloidal particles (12), and then the anti-leakage surface glue layers (13,14) are coated on the upper and lower surfaces of the light-transmitting diffusion plate body (11), wherein the extrusion model (54) sequentially comprises a mirror surface roller (541), a frosted surface roller (542) and a roller (543) engraved with a finer frosted surface according to the discharging direction.
14. The method for manufacturing a quantum dot diffusion plate according to claim 12, further comprising performing a taping process after the light-transmitting diffusion plate body (11) is extrusion-molded and cut into pieces, and coating an anti-slip taping adhesive layer (15) on the cut side edges of the light-transmitting diffusion plate body (11).
15. A backlight module, comprising: the quantum dot diffusion plate (10) for preventing quantum dots from being scattered by heat according to any one of claims 1 to 11, wherein the backlight module further comprises an array of blue light beads (21) disposed under the quantum dot diffusion plate (10), a reflective layer (22) for reflecting light emitted from the blue light beads (21) and reflected light from the quantum dot diffusion plate (10), and at least one brightness enhancement film (23) disposed on the quantum dot diffusion plate (10).
16. The utility model provides a display screen module which characterized in that includes: a backlight module according to claim 15 and a display screen panel (30) on said backlight module.
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