WO2018018910A1 - 扩散元件及其制作方法、背光模组和显示装置 - Google Patents

扩散元件及其制作方法、背光模组和显示装置 Download PDF

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Publication number
WO2018018910A1
WO2018018910A1 PCT/CN2017/078495 CN2017078495W WO2018018910A1 WO 2018018910 A1 WO2018018910 A1 WO 2018018910A1 CN 2017078495 W CN2017078495 W CN 2017078495W WO 2018018910 A1 WO2018018910 A1 WO 2018018910A1
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Prior art keywords
diffusion
nonwoven fabric
slurry
backlight module
diffusion sheet
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PCT/CN2017/078495
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English (en)
French (fr)
Inventor
刘忠华
王丽
郑志福
Original Assignee
京东方科技集团股份有限公司
高创(苏州)电子有限公司
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Application filed by 京东方科技集团股份有限公司, 高创(苏州)电子有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US15/554,342 priority Critical patent/US10488707B2/en
Priority to EP17754593.6A priority patent/EP3495855A4/en
Publication of WO2018018910A1 publication Critical patent/WO2018018910A1/zh

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00317—Production of lenses with markings or patterns
    • B29D11/00326—Production of lenses with markings or patterns having particular surface properties, e.g. a micropattern
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
    • B29D11/00798—Producing diffusers
    • 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
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • 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
    • G02F1/133305—Flexible substrates, e.g. plastics, organic film
    • 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
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • 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
    • G02F1/133553—Reflecting elements
    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00865—Applying coatings; tinting; colouring

Definitions

  • At least one embodiment of the present disclosure is directed to a diffusing element, a method of fabricating the same, a backlight module, and a display device.
  • Liquid crystal displays have been widely used in the field of display, but they do not emit light by themselves.
  • the generated picture light source is provided by the backlight module, and the light source requires uniform and high brightness.
  • the light emitted by it is a point source or a line source rather than a surface source.
  • the diffusion film for the backlight module it can be distributed into a uniform surface light source.
  • optical diffusion results such as refraction and reflection that occur continuously in two media having different refractive indices, thereby obtaining optical diffusion results.
  • At least one embodiment of the present disclosure is directed to a diffusing element, a method of fabricating the same, a backlight module, and a display device to provide a diffusing element that is low in cost, high in yield, and simple in process.
  • At least one embodiment of the present disclosure provides a diffusing element including a nonwoven fabric diffusion sheet having a nonwoven fabric as a base and having diffusing particles attached to a surface of at least one side of the substrate Floor.
  • the diffusing element has a haze of from 97% to 99.7%, and the non-woven sheet has a light transmittance of from 45% to 48%.
  • a diffusing member includes at least one of polypropylene and polyethylene.
  • the diffusion particle layer includes a resin and diffusion particles dispersed in the resin.
  • the diffusion particles have a particle diameter ranging from 5 ⁇ m to 10 ⁇ m.
  • the material of the diffusion particles includes at least one of polymethyl methacrylate (PMMA) and polyethylene terephthalate (PET).
  • PMMA polymethyl methacrylate
  • PET polyethylene terephthalate
  • At least one embodiment of the present disclosure also provides a backlight module including any of the diffusing elements provided by at least one embodiment of the present disclosure.
  • a backlight module further includes a metal frame, and an edge of the non-woven fabric diffusion sheet is fixed on the metal frame and the non-woven fabric diffusion sheet is stretched.
  • a backlight module further includes a light emitting element and a reflective element, the light emitting element being located between the non-woven fabric diffusion sheet and the reflective element, wherein the backlight module is a direct illumination backlight Module.
  • At least one embodiment of the present disclosure further provides a display device including any of the backlight modules provided by at least one embodiment of the present disclosure.
  • a display device includes a television set or a light fixture.
  • At least one embodiment of the present disclosure further provides a method of fabricating a diffusion element, comprising: fabricating a nonwoven fabric diffusion sheet, comprising: providing a nonwoven fabric as a substrate, and at least one of the substrates A layer of diffusion particles is formed on the surface of the side.
  • forming a diffusion particle layer on a surface of at least one side of the substrate includes: providing a slurry containing diffusion particles; coating the slurry on the On the woven fabric; the nonwoven fabric coated with the slurry is dried to form the diffusion particle layer.
  • the slurry further includes a resin, a curing agent, and a solvent.
  • the resin accounts for 85%-90% of the total weight of the slurry, and the diffusion particles account for 5%-8% of the total weight of the slurry.
  • the resin comprises an acrylic resin
  • the material of the diffusion particle comprises polymethyl methacrylate (PMMA) and polyethylene terephthalate (PET).
  • PMMA polymethyl methacrylate
  • PET polyethylene terephthalate
  • the curing agent includes a polyurethane curing agent
  • the solvent includes at least one of toluene, methyl ethyl ketone, and alcohol.
  • the diffusion particles have a particle size ranging from 5 ⁇ m to 10 ⁇ m.
  • FIG. 1 is a schematic view of a backlight module
  • FIG. 2 is a schematic diagram of a diffusing element according to an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of a diffusion element according to another embodiment of the present disclosure.
  • FIG. 4 is a schematic view showing the fixing of a diffusion element and a metal frame according to an embodiment of the present disclosure
  • FIG. 5 is a schematic diagram of a diffusing element and a metal frame fixed in a frame body after being fixed according to an embodiment of the present disclosure
  • FIG. 6 is a schematic diagram of a backlight module according to an embodiment of the present disclosure.
  • FIG. 7a is a schematic diagram of a manufacturing process of a diffusion element according to an embodiment of the present disclosure.
  • FIG. 7b is a schematic diagram showing a manufacturing process of a diffusion device according to an embodiment of the present disclosure.
  • FIG. 8 is an electron micrograph of a diffusion particle layer of a diffusing element according to an embodiment of the present disclosure.
  • 001-back plate 002-reflective element; 003-light-emitting element; 004-diffusion plate; 005-diffusion film; 006-circuit board; 007-frame element; 200-diffusion particle layer; 201-resin; 202-diffusion particle; 01-nonwoven diffusion sheet; 02-metal frame.
  • FIG. 1 is a schematic diagram of a backlight module.
  • the back plate 001 is provided with a reflective element 002 and a light-emitting element 003.
  • the back plate 001 is further provided with a diffusion plate 004 and a diffusion plate 005.
  • the light-emitting element 003 is located at the reflective element 002. Between the diffuser plate 004.
  • the light emitting element 003 can be located within the cavity of the backing plate 001.
  • the material of the diffusion sheet 005 usually comprises polyethylene terephthalate (PET), the material of the diffusion plate 004 usually comprises polystyrene (PS), and the reflective element 002 can be, for example, reflective paper.
  • PET polyethylene terephthalate
  • PS polystyrene
  • the reflective element 002 can be, for example, reflective paper.
  • the backlight module is located on the non-display side of the display panel.
  • the PET diffusion sheet uses a coating process, and the process needs to be subjected to a production process such as a roll material ⁇ UV optical glue coating ⁇ UV exposure machine exposure ⁇ a coil material; in the coating process, the UV optical glue is liable to be scratched, white. Points, foreign bodies and other undesirable phenomena.
  • the structure of the diffusion sheet 005 and the diffusion plate 004 has high cost, is prone to warpage, is not suitable for automatic production, has complicated process, and has high defect rate, and the body belongs to chemical products, which is not conducive to environmental protection defects, and cannot meet the high-end of the photoelectric industry. demand.
  • At least one embodiment of the present disclosure provides a diffusing element comprising a non-woven fabric diffusion sheet 01, which is based on the non-woven fabric 100 and attached to at least one surface of the substrate. There is a diffusion particle layer 200.
  • Non-woven fabric (English name: Non Woven Fabric or Nonwoven cloth), also known as non-woven fabric, is made of oriented or random fibers. It is a new generation of environmentally friendly materials, which are moisture-proof, breathable, flexible, light, non-combustible and easy to decompose. It is non-toxic, non-irritating, rich in color, low in price and recyclable.
  • non-woven fabrics polypropylene (pp) pellets are mostly used as raw materials, which are produced by high-temperature melting, spinning, laying, hot pressing and continuous one-step method. It is called because of the appearance and some properties of the cloth. It is a cloth.
  • the embodiment of the present disclosure does not limit the manner in which the nonwoven fabric is produced.
  • the non-woven fabric has certain elasticity and strong plasticity; it has a certain shielding property and good shielding effect; it has a certain light transmittance, and the light transmittance can be changed; these properties of the non-woven fabric provide a possibility for the substrate as a diffusion element. .
  • a layer of diffusing particles attached to the surface of at least one side of the nonwoven fabric can help atomize the shadow.
  • the diffusing element provided by at least one embodiment of the present disclosure can reduce the production process and reduce the defect rate by using the non-woven diffusion sheet; the substrate using the non-woven fabric as the diffusion sheet is environmentally friendly and safe; and the diffusion particle layer is formed on the non-woven substrate. Easy to produce automated production line; use non-woven diffuser to reduce film Tablets, saving costs.
  • a nonwoven fabric diffusion sheet as a diffusion element has at least one of the following effects as compared with a conventional PET diffusion sheet + PS diffusion plate as a diffusion element.
  • the raw material cost of the non-woven diffusion sheet is low (about 2 yuan/kg), which saves cost; the conventional backlight module diffusion sheet structure has high cost.
  • the raw material cost of a PET substrate is very high (about 13 yuan/kg).
  • the post-production process of the non-woven fabric diffusion sheet is simple (raw material ⁇ cutting ⁇ item box ⁇ assembly); and the usual diffusion sheet, such as PET diffusion sheet, has a complicated production process (raw material ⁇ coating ⁇ cutting ⁇ item box) ⁇ Assembled), the non-woven fabric diffusion sheet has no coating process similar to that of the conventional diffusion sheet, so the process is simple.
  • nonwoven fabric diffusion sheet provided by the embodiment of the present disclosure, it is not necessary to use a diffusion sheet and/or a diffusion sheet.
  • the non-woven diffusion sheet has a simple process, and the usual diffusion sheet is complicated in process, easy to scratch and has a high defect rate.
  • the body of a conventional diffusion sheet such as a PET diffusion sheet belongs to a chemical product and is not environmentally friendly.
  • the diffusing element it is required to have both good light transmittance and an appropriate range of haze value.
  • the penetration of transparent materials is usually characterized by haze.
  • the transparency of the transparent material can be evaluated by measuring the haze.
  • the nonwoven fabric diffusion sheet may have a haze of 97% to 99.7%, and the nonwoven fabric diffusion sheet may have a light transmittance of 45% to 48%.
  • improving the haze of the non-woven fabric can improve the shielding effect, and is beneficial to atomizing the lamp shadow; increasing the transmittance of the non-woven fabric can improve the brightness enhancement performance; and finding the balance point among the above two contradictory parameters, design parameter.
  • the light transmittance may be 48%; the haze may be 99.7%.
  • the diffusion particle layer 200 includes a resin 201 and diffusion particles 202 dispersed in the resin 201.
  • the nonwoven fabric material includes at least one of polypropylene and polyethylene.
  • the material of the diffusing particles includes polymethyl methacrylate (PMMA) and polyethylene terephthalate (PET).
  • PMMA polymethyl methacrylate
  • PET polyethylene terephthalate
  • the particle size of the diffusing particles ranges from 5 ⁇ m to 10 ⁇ m.
  • a diffusion particle layer 200 is attached to a surface of at least one side of the substrate, As shown in FIG. 2, a diffusion particle layer 200 is attached to a surface of one side of the substrate, or as shown in FIG. 3, a diffusion particle layer 200 is attached to both opposite surfaces on both sides of the substrate.
  • the density of the diffusion particles 202 of the diffusion particle layer 200 located on both sides of the substrate may be the same or different, and is not limited herein.
  • diffusion particles may be attached to the slits of the fibers constituting the nonwoven fabric, which is not limited by the embodiment of the present disclosure.
  • At least one embodiment of the present disclosure provides a backlight module including any of the above diffusion elements.
  • the nonwoven fabric diffusion sheet provided by the embodiment of the present disclosure can be used as a diffusion element instead of the structure of a conventional PET diffusion sheet + PS diffusion plate.
  • the elastic shrinkage of the non-woven fabric can be utilized, and the non-woven fabric is designed to have a size smaller than that of the metal frame, and the non-woven fabric has a metal frame design and a metal frame. Embedded in the frame components such as plastic frames to ensure stiffness.
  • the backlight module further includes a metal frame 02, and the edge of the nonwoven fabric diffusion sheet 01 is fixed on the metal frame 02 and the nonwoven fabric diffusion sheet 01 is tightened.
  • the material of the metal frame 02 includes stainless steel, aluminum, aluminum alloy, etc., but is not limited thereto.
  • the nonwoven fabric diffusion sheet 01 fixed thereto can have good stiffness.
  • the edge of the nonwoven fabric diffusion sheet 01 may be bonded to the metal frame 02 by an adhesive.
  • the binder may include ethyl cyanoacrylate (ECA, also known as 2-cyano-2-ethyl acrylate), but is not limited thereto.
  • ECA ethyl cyanoacrylate
  • the non-woven fabric diffusion sheet can be directly used for assembly of the backlight module after being directly fixed to the metal frame.
  • the metal frame 02 can be disposed within the frame member 007.
  • the backlight module may further include a reflective element 002 and a light-emitting element 003, and the light-emitting element 003 is located between the nonwoven fabric diffusion sheet 01 and the reflective element 002.
  • the light emitting element 003 can be located within the cavity of the backing plate 001.
  • the backlight module is a direct illumination type backlight module.
  • the light-emitting element 003 includes, for example, a plurality of LED lights, and the plurality of LED lights can be disposed on the circuit board 006 to form an LED light bar.
  • Circuit board 006 includes, for example, a flexible circuit board.
  • At least one embodiment of the present disclosure provides a display device including any of the above backlight modules.
  • the display device includes a television set, a light fixture, and the like, but is not limited thereto.
  • At least one embodiment of the present disclosure provides a method of fabricating a diffusion element, comprising: fabricating a nonwoven fabric diffusion sheet, comprising: providing a nonwoven fabric as a substrate, and forming a diffusion on at least one surface of the substrate Particle layer.
  • forming a diffusion particle layer on a surface of at least one side of the substrate includes: providing a slurry containing the diffusion particles; coating the slurry on the nonwoven fabric; The fabric is dried to form a layer of diffusing particles.
  • the slurry also includes a resin, a curing agent, and a solvent.
  • the resin may be, for example, a UV curable resin, but is not limited thereto.
  • the resin may comprise from 85% to 90% by weight of the total slurry and the diffusion particles may comprise from 5% to 8% by weight of the total slurry.
  • the diffusion particles may have a particle size ranging from about 5 ⁇ m to 10 ⁇ m.
  • the curing agent and solvent may comprise from 5% to 8% by weight based on the total weight of the slurry.
  • a curing agent is used as a catalyst to accelerate the curing of the resin.
  • the resin accounts for 90% of the total weight of the slurry
  • the diffusion particles account for 5% of the total weight of the slurry
  • the curing agent and solvent account for 5% of the total weight of the slurry.
  • the resin includes an acrylic resin
  • the material of the diffusion particles includes at least one of polymethyl methacrylate (PMMA) and polyethylene terephthalate (PET)
  • the curing agent includes a polyurethane curing agent
  • the solvent includes toluene. At least one of methyl ethyl ketone and alcohol.
  • the slurry is disposed in the formulation chamber 701, and then placed in the coating receiving chamber 702, and can be coated on one side.
  • the manner of the cloth can also be applied to the nonwoven fabric large coil 7021 by double-sided coating.
  • the nonwoven large roll 7021 can be placed on the rack 7022.
  • Coating can be performed using a coater 7023 that can be placed in the coating receiving chamber 702, including a container 70231 in which the slurry is placed and a coating head 70232.
  • the slurry can be placed in a container 70231 in which the slurry is placed.
  • a coating head 70232 may be disposed in the container 70231 in which the slurry is placed. After the slurry is applied, the first test 071 can be performed to check whether the coating is uniform. The coated non-woven fabric can be placed in the oven 7031 of the drying chamber 703. After drying, the second detection 072 can be performed (for example, detecting whether the diffusion particles are uniform), and whether the diffusion particle layer formed after drying is in compliance with the requirements. Striping and receiving can then be performed on the slitter feeder 7024. A slitter take-up machine 7024 can be placed in the coating receiving compartment 702.
  • a third test 073 (for example, detecting the haze and light transmittance of the nonwoven fabric diffusion sheet) can be performed, and whether the obtained nonwoven fabric diffusion sheet meets the requirements is checked. It should be noted that the method of fabricating the diffusion element in the embodiment of the present disclosure is not limited to the method given above.
  • Fig. 8 is a view showing an electron micrograph of a diffusion particle layer in a diffusion element fabricated in one embodiment. As can be seen from the figure, the diffusion particles of the diffusion particle layer diffusion particle layer are closely arranged, and the particle size range of the diffusion particle is about 5 ⁇ m- 10 ⁇ m.
  • any of the nonwoven fabric diffusion sheets provided by the embodiments of the present disclosure may completely replace the structure of the diffusion plate + diffusion sheet.
  • the test optical data using the structure of the nonwoven fabric diffusion sheet of the present disclosure and the structure using the diffusion plate + diffusion sheet are given below.
  • OC refers to the display panel (open cell)
  • L/B refers to the light bar
  • 2835PKG is the LED model
  • NTSC refers to the national standard color gamut
  • B8N81, DJ150, B8N80, and KDD188NH are models.
  • the non-woven fabric diffusion sheet provided by the embodiment of the present disclosure can achieve the effect of light diffusion, and the optical parameters are not significantly different from the optical structure of the PET diffusion sheet + PS diffusion plate.
  • the resin accounted for 90% of the total weight of the slurry, and the diffusion particles accounted for 5% of the total weight of the slurry.
  • the particle size of the diffusion particles ranges from 5 ⁇ m to 10 ⁇ m.
  • the curing agent and solvent account for 5% of the total weight of the slurry.
  • the resin is made of acrylic resin; the material of the diffusion particles is polymethyl methacrylate (PMMA); the curing agent is a polyurethane curing agent; and the solvent is methyl ethyl ketone.

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

Abstract

一种扩散元件及其制作方法、背光模组和显示装置。该扩散元件包括无纺布扩散片（01），该无纺布扩散片（01）以无纺布（100）为基底，并在基底的至少一侧的表面上附着有扩散粒子层（200）。该扩散元件成本低、良率高且制作工艺简单。

Description

扩散元件及其制作方法、背光模组和显示装置 技术领域
本公开至少一实施例涉及一种扩散元件及其制作方法、背光模组和显示装置。
背景技术
液晶显示器在显示领域得到了越来越广泛的应用，但其本身不发光，所产生的画面光源是由其中的背光模组所提供，其光源要求均匀、高亮度。
不论是发光二极管(Light Emitting diode，LED)背光源还是冷阴极荧光灯(Cold Cathode Fluorescent Lamp，CCFL)背光源，其所发出的光为点光源或者线光源，而不是面光源。但经过背光模组用扩散膜，能够将其分布成一个均匀的面光源。光线经过扩散层时，通过在两种折射率不同的介质中不断发生的折射、反射等光学现象，从而得到光学扩散的结果。
发明内容
本公开的至少一实施例涉及一种扩散元件及其制作方法、背光模组和显示装置，以提供一种成本低、良率高且工艺简单的扩散元件。
本公开的至少一实施例提供一种扩散元件，包括无纺布扩散片，所述无纺布扩散片以无纺布为基底，并在所述基底的至少一侧的表面上附着有扩散粒子层。
根据本公开一实施例提供的扩散元件，所述无纺布扩散片的雾度为97％-99.7％，所述无纺布扩散片的透光率为45％-48％。
根据本公开一实施例提供的扩散元件，所述无纺布材质包括聚丙烯和聚乙烯至少之一。
根据本公开一实施例提供的扩散元件，所述扩散粒子层包括树脂和分散在所述树脂中的扩散粒子。
根据本公开一实施例提供的扩散元件，所述扩散粒子的粒径范围为5μm-10μm。
根据本公开一实施例提供的扩散元件，所述扩散粒子的材质包括聚甲基丙烯酸甲脂(PMMA)和聚对苯二甲酸乙二醇酯(PET)至少之一。
本公开的至少一实施例还提供一种背光模组，包括本公开的至少一实施例提供的任一扩散元件。
根据本公开一实施例提供的背光模组，还包括金属框，所述无纺布扩散片的边缘固定在所述金属框上并使所述无纺布扩散片绷紧。
根据本公开一实施例提供的背光模组，还包括发光元件和反射元件，所述发光元件位于所述无纺布扩散片和所述反射元件之间，所述背光模组为直下照射式背光模组。
本公开的至少一实施例还提供一种显示装置，包括本公开的至少一实施例提供的任一背光模组。
根据本公开一实施例提供的显示装置，所述显示装置包括电视机或灯具。
本公开的至少一实施例还提供一种扩散元件的制作方法，包括制作无纺布扩散片，制作所述无纺布扩散片包括：提供无纺布作为基底，并在所述基底的至少一侧的表面上形成扩散粒子层。
根据本公开一实施例提供的扩散元件的制作方法，在所述基底的至少一侧的表面上形成扩散粒子层包括：提供含有扩散粒子的浆料；将所述浆料涂布在所述无纺布上；将涂布有浆料的无纺布烘干形成所述扩散粒子层。
根据本公开一实施例提供的扩散元件的制作方法，所述浆料还包括树脂、固化剂和溶剂。
根据本公开一实施例提供的扩散元件的制作方法，所述树脂占所述浆料总重量的85％-90％，所述扩散粒子占所述浆料总重量的5％-8％。
根据本公开一实施例提供的扩散元件的制作方法，所述树脂包括丙烯酸树脂；所述扩散粒子的材质包括聚甲基丙烯酸甲脂(PMMA)和聚对苯二甲酸乙二醇酯(PET)至少之一；所述固化剂包括聚氨脂固化剂；所述溶剂包括甲苯、丁酮和酒精至少之一。
根据本公开一实施例提供的扩散元件的制作方法，所述扩散粒子的粒径范围为5μm-10μm。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本公开的一些实施例， 而非对本公开的限制。
图1为一种背光模组的示意图；
图2为本公开一实施例提供的一种扩散元件的示意图；
图3为本公开另一实施例提供的一种扩散元件的示意图；
图4为本公开一实施例提供的扩散元件与金属框固定的示意图；
图5为本公开一实施例提供的扩散元件与金属框固定后内嵌在框体元件中的示意图；
图6为本公开一实施例提供的一种背光模组的示意图；
图7a为本公开一实施例提供的一种扩散元件的制作流程示意图；
图7b为本公开一实施例提供的一种结合装置描述扩散元件的制作流程的示意图；
图8为本公开一实施例提供的一种扩散元件的扩散粒子层的电镜图片。
附图标记：
001-背板；002-反射元件；003-发光元件；004-扩散板(diffusion plate)；005-扩散片(diffusion film)；006-电路板；007-框体元件；100-无纺布；200-扩散粒子层；201-树脂；202-扩散粒子；01-无纺布扩散片；02-金属框。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本公开保护的范围。
除非另外定义，本公开使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“一个”、“一”或者“该”等类似词语也不表示数量限制，而是表示存在至少一个。“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是 直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也可能相应地改变。
图1中给出了一种背光模组的示意图，背板001内设置有反射元件002和发光元件003，背板001上还设置有扩散板004和扩散片005，发光元件003位于反射元件002和扩散板004之间。发光元件003可位于背板001的腔体内。扩散片005的材质通常包括聚对苯二甲酸乙二醇酯(polyethylene terephthalate，PET)，扩散板004的材质通常包括聚苯乙烯(polystyrene，PS)，反射元件002例如可为反射纸。通常背光模组位于显示面板的非显示侧。
通常，PET扩散片使用涂布工艺，工艺需要经过卷材入料→UV光学胶涂布→UV曝光机曝光→卷材等生产过程；在涂布过程中，UV光学胶容易出现划伤，白点，异物等不良现象。
扩散片005和扩散板004的架构具有成本高，易出现翘曲、不适用于自动化生产，工艺复杂，不良率较高，其本体属于化工产品，不利于环保等缺陷，无法满足光电行业的高端需求。
如图2所示，本公开至少一实施例提供一种扩散元件，包括无纺布扩散片01，无纺布扩散片以无纺布100为基底，并在基底的至少一侧的表面上附着有扩散粒子层200。
无纺布(英文名：Non Woven Fabric或者Nonwoven cloth)又称不织布，是由定向的或随机的纤维而构成，是新一代环保材料，具有防潮、透气、柔韧、质轻、不助燃、容易分解、无毒无刺激性、色彩丰富、价格低廉、可循环再用等特点。例如无纺布(多采用聚丙烯(pp材质)粒料为原料，经高温熔融、喷丝、铺网、热压卷取连续一步法生产而成。因具有布的外观和某些性能而称其为布。本公开的实施例对于无纺布采用何种方式制作不作限定。
无纺布具有一定的弹性，可塑性强；具有一定的遮蔽性，遮蔽效果好；具有一定的透光性，透光率可以更改；无纺布的这些性质为其作为扩散元件的基底提供了可能。无纺布的至少一侧的表面上附着的扩散粒子层，可有助于雾化掉灯影。
本公开至少一实施例提供的扩散元件，使用无纺布扩散片可以减少生产工艺，降低不良率；使用无纺布作为扩散片的基材环保，安全；在无纺布基底上形成扩散粒子层便于产线自动化生产；使用无纺布扩散片可以减少膜 片，节约成本。
与通常的PET扩散片+PS扩散板作为扩散元件相比，采用无纺布扩散片作为扩散元件具有如下至少之一的有益效果。
(1)无纺布扩散片的原材料成本低(约2元/kg)，节约成本；通常的背光模组扩散片架构成本高。例如，PET基材的原料成本非常高(约13元/kg)。
(2)无纺布扩散片的后期生产工艺简单(原材→裁切→项框→组装)；而通常的扩散片例如PET扩散片生产工艺复杂(原材→涂布→裁切→项框→组装)，无纺布扩散片则无类似于通常的扩散片的涂布工艺，故工艺简单。
(3)无纺布扩散片的生产设备投入低，通常的扩散片例如PET扩散片所需要的涂布设备成本非常高；因此整体架构成本优势明显。
(4)通常的扩散片架构不适用于自动化生产；自动化生产使用的光学膜片材料越少越利于生产(自动化生产使用的机械手臂越少)。
(5)采用本公开实施例提供的无纺布扩散片，则不需要再使用扩散片和/或扩散板。
(6)无纺布扩散片工艺简单，通常的扩散片在生产过程中，工艺复杂，易划伤，不良率较高。
(7)通常的扩散片例如PET扩散片的本体属于化工产品，不利于环保。
对于扩散元件，要求同时具有良好的透光性与适当范围的雾度(Haze)值。透明材料的穿透性通常采用雾度来表征。通过测量雾度可以评价透明材料的透明效果。例如，无纺布扩散片的雾度可为97％-99.7％，无纺布扩散片的透光率可为45％-48％。例如，提高无纺布的雾度，可提高遮蔽效果，有利于雾化掉灯影；增加无纺布的透过率，可提高增光性能；可在以上两个矛盾参数中，寻找平衡点，设计参数。进一步例如，为了获得较好的综合效果，透光率可采用48％；雾度可采用99.7％。
例如，如图2所示，扩散粒子层200包括树脂201和分散在树脂201中的扩散粒子202。例如，为了使扩散元件获得较好的支撑作用，无纺布材质包括聚丙烯和聚乙烯至少之一。例如，为了使扩散元件在雾度和透光率之间获得较好的平衡，扩散粒子的材质包括聚甲基丙烯酸甲脂(PMMA)和聚对苯二甲酸乙二醇酯(PET)至少之一。例如，为了使扩散元件在雾度和透光率之间获得较好的平衡，扩散粒子的粒径范围为5μm-10μm。
本公开的实施例中，在基底的至少一侧的表面上附着有扩散粒子层200， 可如图2所示，在基底的一侧的表面上附着有扩散粒子层200，也可如图3所示，在基底的两侧上两个相对的表面上均附着有扩散粒子层200，位于基底两侧的扩散粒子层200的扩散粒子202的密度可以相同也可以不同，在此不作限定。
例如，除了在基底的至少一侧的表面上附着有扩散粒子外，在构成无纺布的纤维的缝隙中也可附着有扩散粒子，本公开的实施例对此不做限定。
本公开至少一实施例提供一种背光模组，包括上述任一扩散元件。
采用本公开实施例提供的无纺布扩散片作为扩散元件，可以替代通常的PET扩散片+PS扩散板的架构。
例如，为了解决无纺布扩散片组装的挺性问题，可利用无纺布的弹性收缩，将无纺布设计成其尺寸小于金属边框的尺寸，无纺布四边金属项框设计，金属框内嵌在框体元件例如塑胶边框内，以保证挺性。例如，如图4所示，背光模组还包括金属框02，无纺布扩散片01的边缘固定在金属框02上并使无纺布扩散片01绷紧。例如，金属框02的材质包括不锈钢、铝和铝合金等，但不限于此。金属框02使用不锈钢材质的情况下，可以使得固定在其上的无纺布扩散片01具有较好的挺性。例如，无纺布扩散片01的边缘可通过粘结剂粘结在金属框02上。例如，粘结剂可包括氰基丙烯酸乙酯(ECA，又称为2-氰基-2-丙烯酸乙酯)，但不限于此。例如，可将无纺布扩散片直接和金属框固定好后直接用于背光模组的组装。
例如，如图5所示，金属框02可设置在框体元件007内。
例如，如图6所示，背光模组还可包括反射元件002和发光元件003，发光元件003位于无纺布扩散片01和反射元件002之间。发光元件003可位于背板001的腔体内。
例如，背光模组为直下照射式背光模组。发光元件003例如包括多个LED灯，多个LED灯可设置在电路板006上形成LED灯条。电路板006例如包括柔性电路板。
本公开至少一实施例提供一种显示装置，包括上述任一背光模组。
例如，显示装置包括电视机、灯具等，但不限于此。
本公开至少一实施例提供一种扩散元件的制作方法，包括制作无纺布扩散片，制作无纺布扩散片包括：提供无纺布作为基底，并在基底的至少一侧的表面上形成扩散粒子层。
例如，如图7a所示，在基底的至少一侧的表面上形成扩散粒子层包括：提供含有扩散粒子的浆料；将浆料涂布在无纺布上；将涂布有浆料的无纺布烘干形成扩散粒子层。
例如，浆料还包括树脂、固化剂和溶剂。树脂例如可采用UV固化树脂，但不限于此。例如，树脂可占浆料总重量的85％-90％，扩散粒子可占浆料总重量的5％-8％。例如，扩散粒子的粒径范围可约为5μm-10μm。例如，固化剂和溶剂可占浆料总重量的5％-8％。固化剂用作催化剂，以加速树脂的固化。进一步例如，树脂占浆料总重量的90％，扩散粒子占浆料总重量的5％，固化剂和溶剂占浆料总重量的5％。
例如，树脂包括丙烯酸树脂；扩散粒子的材质包括聚甲基丙烯酸甲脂(PMMA)和聚对苯二甲酸乙二醇酯(PET)至少之一；固化剂包括聚氨脂固化剂；溶剂包括甲苯、丁酮和酒精至少之一。
需要说明的是，上述有关材质以及用量的描述只是列举，并非限定。亦可采用其他材质和用量，本公开的实施例对此不作限定。
例如，如图7b所示，本公开一实施例提供的一种扩散元件的制作方法中，浆料在配方室701中完成配置，再置于涂布收料室702中，可采用单面涂布的方式，当然，也可以采用双面涂布的方式，将浆料涂布在无纺布大卷料7021上。无纺布大卷料7021可置于料架7022上。可使用涂布机7023进行涂布，涂布机7023可置于涂布收料室702中，包括放置浆料的容器70231和涂布头70232。浆料可置于放置浆料的容器70231中。放置浆料的容器70231中可设置涂布头70232。涂布浆料后可进行第一次检测071，检测涂布的是否均匀。涂布后的无纺布可置于烘干室703的烘箱7031中，烘干后可进行第二次检测072(例如检测扩散粒子是否均匀)，检测烘干后形成的扩散粒子层是否符合要求，然后可在分条收料机7024上进行分条和收料。分条收料机7024可置于涂布收料室702中。收料后可进行第三次检测073(例如检测无纺布扩散片的雾度和透光率)，检测所得的无纺布扩散片是否符合要求。需要说明的是，本公开实施例中扩散元件的制作方法不限于上述给出的方法。
图8示出了一个实施例制作的扩散元件中扩散粒子层的电镜图片，从图中可以看出，扩散粒子层扩散粒子层的扩散粒子紧密排布，扩散粒子的粒径范围约为5μm-10μm。
本公开的实施例提供的任一无纺布扩散片可以完全取代扩散板+扩散片的架构。以下给出了单纯使用本公开的无纺布扩散片的架构以及使用扩散板+扩散片的架构的测试光学数据。
表一和表二中，OC指代显示面板(open cell)，L/B指代灯条，2835PKG是LED型号，NTSC指代国标色域，B8N81、DJ150、B8N80、KDD188NH是型号。
表一无纺布扩散片架构测试数据
Figure PCTCN2017078495-appb-000001
表二PET扩散片+PS扩散板的架构测试数据
Figure PCTCN2017078495-appb-000002
从表一和表二可以看出，本公开的实施例提供的无纺布扩散片可以达到光扩散的效果，与PET扩散片+PS扩散板的光学架构相比，光学参数差别不大，可以完全替代扩散板+扩散片的架构。表一中使用的无纺布扩散片制作时树脂占浆料总重量的90％，扩散粒子占浆料总重量的5％。例如，扩散粒子的粒径范围为5μm-10μm。例如，固化剂和溶剂占浆料总重量的5％。树脂采用丙烯酸树脂；扩散粒子的材质为聚甲基丙烯酸甲脂(PMMA)；固化剂采用聚氨脂固化剂；溶剂采用丁酮。
有以下几点需要说明：
(1)除非另作定义，本公开实施例及其附图中，同一标号代表同一含义。
(2)本公开实施例附图中，只涉及到与本公开实施例涉及到的结构，其他结构可参考通常设计。
(3)为了清晰起见，在用于描述本公开的实施例的附图中，层或区域的厚度被放大。可以理解，当诸如层、膜、区域或基板之类的元件被称作位于另一元件“上”或“下”时，该元件可以“直接”位于另一元件“上”或“下”，或者可以存在中间元件。
(4)在不冲突的情况下，本公开的不同实施例及同一实施例中的特征可以相互组合。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所述权利要求的保护范围为准。
本专利申请要求于2016年7月27日递交的中国专利申请第201610601764.5号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。

Claims (17)

  1. 一种扩散元件，包括无纺布扩散片，其中，所述无纺布扩散片以无纺布为基底，并在所述基底的至少一侧的表面上附着有扩散粒子层。
  2. 根据权利要求1所述的扩散元件，其中，所述无纺布扩散片的雾度为97％-99.7％，所述无纺布扩散片的透光率为45％-48％。
  3. 根据权利要求1或2所述的扩散元件，其中，所述无纺布材质包括聚丙烯和聚乙烯至少之一。
  4. 根据权利要求1-3任一项所述的扩散元件，其中，所述扩散粒子层包括树脂和分散在所述树脂中的扩散粒子。
  5. 根据权利要求4所述的扩散元件，其中，所述扩散粒子的粒径范围为5μm-10μm。
  6. 根据权利要求4或5所述的扩散元件，其中，所述扩散粒子的材质包括聚甲基丙烯酸甲脂(PMMA)和聚对苯二甲酸乙二醇酯(PET)至少之一。
  7. 一种背光模组，包括权利要求1-6任一项所述的扩散元件。
  8. 根据权利要求7所述的背光模组，还包括金属框，其中，所述无纺布扩散片的边缘固定在所述金属框上并使所述无纺布扩散片绷紧。
  9. 根据权利要求7所述的背光模组，还包括发光元件和反射元件，其中，所述发光元件位于所述无纺布扩散片和所述反射元件之间，所述背光模组为直下照射式背光模组。
  10. 一种显示装置，包括权利要求7-9任一项所述的背光模组。
  11. 根据权利要求10所述的显示装置，其中，所述显示装置包括电视机或灯具。
  12. 一种扩散元件的制作方法，包括制作无纺布扩散片，制作所述无纺布扩散片包括：提供无纺布作为基底，并在所述基底的至少一侧的表面上形成扩散粒子层。
  13. 根据权利要求12所述的扩散元件的制作方法，其中，在所述基底的至少一侧的表面上形成扩散粒子层包括：提供含有扩散粒子的浆料；将所述浆料涂布在所述无纺布上；将涂布有浆料的无纺布烘干形成所述扩散粒子层。
  14. 根据权利要求13所述的扩散元件的制作方法，其中，所述浆料还包括树脂、固化剂和溶剂。
  15. 根据权利要求14所述的扩散元件的制作方法，其中，所述树脂占所述浆料总重量的85％-90％，所述扩散粒子占所述浆料总重量的5％-8％。
  16. 根据权利要求14或15所述的扩散元件的制作方法，其中，所述树脂包括丙烯酸树脂；所述扩散粒子的材质包括聚甲基丙烯酸甲脂(PMMA)和聚对苯二甲酸乙二醇酯(PET)至少之一；所述固化剂包括聚氨脂固化剂；所述溶剂包括甲苯、丁酮和酒精至少之一。
  17. 根据权利要求13-16任一项所述的扩散元件的制作方法，其中，所述扩散粒子的粒径范围为5μm-10μm。
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