WO2020062411A1 - 扩散膜及其制作方法 - Google Patents

扩散膜及其制作方法 Download PDF

Info

Publication number
WO2020062411A1
WO2020062411A1 PCT/CN2018/113259 CN2018113259W WO2020062411A1 WO 2020062411 A1 WO2020062411 A1 WO 2020062411A1 CN 2018113259 W CN2018113259 W CN 2018113259W WO 2020062411 A1 WO2020062411 A1 WO 2020062411A1
Authority
WO
WIPO (PCT)
Prior art keywords
scattering particles
diffusion film
substrate
refractive index
organic resin
Prior art date
Application number
PCT/CN2018/113259
Other languages
English (en)
French (fr)
Inventor
张桂洋
Original Assignee
武汉华星光电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 武汉华星光电技术有限公司 filed Critical 武汉华星光电技术有限公司
Priority to US16/316,917 priority Critical patent/US20210364676A1/en
Publication of WO2020062411A1 publication Critical patent/WO2020062411A1/zh

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
    • 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
    • B29D11/00788—Producing optical films
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • 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
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/88—Adding charges, i.e. additives
    • B29B7/90—Fillers or reinforcements, e.g. fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
    • B29K2033/04—Polymers of esters
    • B29K2033/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/003—PET, i.e. poylethylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/003—Reflective
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0031—Refractive

Definitions

  • the present invention relates to the technical field of displays, and in particular, to a diffusion film and a manufacturing method thereof.
  • Diffusion film can expand point light source and line light source to surface light source, improve the overall display effect, and is an important component in various display devices.
  • the reason why the diffuser film can convert point light source and line light source to surface light source is because the internal scattering particles scatter the incident light to other directions, and the strength of its scattering ability is measured by "haze".
  • haze the internal scattering particles scatter the incident light to other directions, and the strength of its scattering ability is measured by "haze”.
  • haze Generally, a diffusion film in a display device causes a loss of brightness while increasing the haze, and the diffusion film of the prior art cannot take both haze and transmittance into consideration.
  • An object of the present invention is to provide a diffusion film and a manufacturing method thereof, so as to solve the problem that the haze and the transmittance of the diffusion film in the prior art cannot be taken into consideration.
  • the present invention provides a diffusion film, including:
  • a plurality of scattering particles the scattering particles being evenly distributed in the substrate
  • the absolute value of the difference in refractive index between the scattering particles and the substrate is less than or equal to 0.25
  • the particle diameter of the scattering particles is between 1 micrometer and 6 micrometers
  • the scattering particles are in the
  • the weight percentage concentration in the substrate is between 1 ⁇ and 12 ⁇ , thereby making the haze and transmittance of the diffusion film greater than 80%.
  • the substrate is made of an organic resin, wherein the organic resin is polymethyl methacrylate or polyethylene terephthalate; and the scattering particles are made of an organic material or an inorganic material.
  • the organic material is epoxy resin or polydimethylsiloxane, and the inorganic material is titanium dioxide, silicon dioxide or zinc oxide.
  • the absolute value of the difference in refractive index between the scattering particles and the substrate is about 0.07
  • the particle diameter of the scattering particles is about 4 microns
  • the scattering particles are at The weight percentage concentration in the substrate is about 5 ⁇ .
  • the present invention also provides a backlight module, wherein the backlight module includes the diffusion film described above.
  • the present invention also provides a display panel having a backlight module, wherein the backlight module includes a diffusion film as described above.
  • the present invention also provides a display device.
  • the display device has a display panel, and the display panel has a backlight module.
  • the backlight module includes a diffusion film as described above.
  • the present invention also provides a method for manufacturing a diffusion film, including the following steps:
  • the absolute value of the difference in refractive index between the scattering particles and the organic resin is less than or equal to 0.25
  • the particle diameter of the scattering particles is between 1 ⁇ m and 6 ⁇ m
  • the scattering particles are in the
  • the weight percentage concentration in the organic resin is between 1 ⁇ and 12 ⁇ , thereby making the haze and transmittance of the diffusion film greater than 80%.
  • the method further includes the following steps:
  • the mixture is injection-molded with a screw-type injection molding machine or a plunger-type injection molding machine to form an injection-molded article, where the screw temperature of the injection molding machine is 160 to 250 ° C, the head temperature is 220 to 260 ° C, and the main speed of the screw is 120 to 130 rpm and injection pressure of 10 to 80 MPa; and
  • the substrate is made of an organic resin, wherein the organic resin is polymethyl methacrylate or polyethylene terephthalate; and the scattering particles are made of an organic material or an inorganic material.
  • the organic material is epoxy resin or polydimethylsiloxane, and the inorganic material is titanium dioxide, silicon dioxide or zinc oxide.
  • the absolute value of the difference in refractive index between the scattering particles and the substrate is about 0.07
  • the particle diameter of the scattering particles is about 4 microns
  • the scattering particles are at The weight percentage concentration in the substrate is about 5 ⁇ .
  • the present invention provides a diffusion film and a manufacturing method thereof.
  • a commonly used organic transparent resin material is used as a base material, and scattering particles with a particle size on the order of micrometers are incorporated.
  • the concentration is mixed to make a diffusion film with high haze and high transmittance, so as to solve the problem that the haze and transmittance of the diffusion film cannot be improved at the same time in the prior art.
  • FIG. 1 is a schematic perspective view of a diffusion film according to a preferred embodiment of the present invention.
  • FIG. 2 shows the haze and transmittance of a diffusion film made according to a preferred embodiment of the present invention under the passage of light of various wavelengths.
  • a commonly used organic transparent resin material is used as a substrate, and scattering particles with a particle size on the order of micrometers are incorporated.
  • the incorporation concentration of the scattering particles produces a diffusion film having high haze and high transmittance.
  • the refractive index, particle size and incorporation concentration of the scattering particles are described as follows:
  • the refractive index of scattering particles When the refractive indexes between the scattering particles and the surrounding substrate medium are close to each other, the refractive index uniformity of the entire diffusion film is good, which can make the probability of forward scattering larger and scatter backward. The probability is smaller and the transmittance of the diffusion film is higher.
  • the extreme case is that the refractive index of the scattering particles is completely equal to the refractive index of the substrate. In this case, after deducting the reflection loss at the external interface, it can be considered that the diffusion film is fully transparent. At this time, the transmittance of the diffusion film is Ideal maximum.
  • the particle size of the scattering particles When the particle size of the scattering particles is small, the light scattering effect on the short wavelength is strong, so the scattering effect of the short wavelength light is increased. When the particle size of the scattering particles is increased, this will increase the scattering effect of long-wavelength light. When the particle size of the scattering particles reaches a specific value, the scattering ability of the scattering particles to blue light to red light is basically the same. At this time, the diffusion effect of the diffusion film does not substantially change with the wavelength.
  • the particle size of the scattering particles at this time is the particle size of the scattering particles selected and used in the embodiments of the present invention. The diffusion film at this time basically does not generate dispersion and can be better applied to a display.
  • the doping concentration of the scattering particles affects the mean free path of the photon. As the concentration of scattering particles in the substrate increases, the number of scattering times that a photon undergoes after it enters the diffusion film will increase, resulting in a smaller average free path of photon motion and an increase in the backscattering effect, thereby increasing the fog of the diffusion film. Degree, reducing the transmittance of the diffusion film. In order to obtain a higher transmittance, the concentration of the scattering particles should not be too high. However, if the concentration of the scattering particles is too small, the haze will be reduced, so the concentration of the scattering particles is also one of the key parameters that affect the production of a diffusion film with high haze and high transmittance.
  • FIG. 1 is a schematic perspective view of a diffusion film according to a preferred embodiment of the present invention.
  • an embodiment of the present invention provides a diffusion film 1.
  • the diffusion film 1 includes a substrate 11 and a plurality of scattering particles 12.
  • the scattering particles 12 are evenly distributed in the substrate 11.
  • the absolute value of the difference in refractive index between the scattering particles 12 and the substrate 11 is less than or equal to (ie, not greater than) 0.25, and the particle diameter of the scattering particles 12 is 1 micron.
  • the weight percentage concentration of the scattering particles 12 in the substrate 11 is between 1 ⁇ and 12 ⁇ , thereby making the haze and transmittance of the diffusion film 1 greater than 80. %.
  • the substrate 11 is made of an organic resin.
  • the organic resin is polymethyl methacrylate (PMMA) having a refractive index of about 1.49 or polyethylene terephthalate (PET) having a refractive index of about 1.65. ).
  • the scattering particles 12 are made of an organic material or an inorganic material
  • the organic material is an epoxy resin having a refractive index of about 1.58 or a polydimethylsiloxane (PDMS) having a refractive index of about 1.41.
  • said inorganic material is titanium dioxide having a refractive index of about 2.35 (TiO2), a refractive index of about 1.46, a silica (SiO 2) or zinc oxide having a refractive index of about 2 (ZnO).
  • the absolute value of the difference between the refractive indexes between the scattering particles 12 and the substrate 11 may be limited to less than or equal to 0.25.
  • organic materials such as PMMA, PS, epoxy resin, PDMS, etc.
  • different synthetic conditions can obtain slightly different refractive indices. It is even possible to prepare a scattering film with the same type of material, for example, PMMA of one refractive index is used as the substrate 11 and PMMA of another refractive index is used as the scattering particles 12, which can reduce the scattering particles 12 and the The stress between the substrates 11 provides a more effective diffusion film.
  • the inventor of the present application has discovered that when the absolute value of the difference in refractive index between the scattering particles 12 and the substrate 11 is 0.1, the particle diameter of the scattering particles 12 is 1 micron, and the scattering particles 12 When the weight percentage concentration in the substrate 11 is between 1 ⁇ and 12 ⁇ , the haze of the diffusion film is about 10% to 65% and the transmittance is 95% to 45%.
  • the absolute value of the refractive index difference between the scattering particles 12 and the substrate 11 is 0.1
  • the particle diameter of the scattering particles 12 is 6 microns, and the scattering particles 12 are in the substrate 11
  • the weight percentage concentration is between 1 ⁇ and 12 ⁇
  • the haze of the diffusion film is about 30% to 95%
  • the transmittance is 85% to 30%.
  • the inventor of the present application has discovered that when the absolute value of the difference in refractive index between the scattering particles 12 and the substrate 11 is 0.2, the particle diameter of the scattering particles 12 is 1 micron, and the scattering When the weight percentage concentration of the particles 12 in the substrate 11 is between 1 ⁇ and 12 ⁇ , the haze of the diffusion film is about 25% to 80% and the transmittance is 90% to 25%.
  • the absolute value of the refractive index difference between the scattering particles 12 and the substrate 11 is 0.2
  • the particle diameter of the scattering particles 12 is 6 microns, and the scattering particles 12 are in the substrate 11
  • the weight percentage concentration is between 1 ⁇ and 12 ⁇
  • the haze of the diffusion film is about 45% to 97%
  • the transmittance 70% to 15%.
  • FIG. 2 shows the haze and transmittance of a diffusion film made according to a preferred embodiment of the present invention under the passage of light of various wavelengths.
  • the particle diameter of the scattering particles is 4 ⁇ m
  • the weight percentage concentration of the scattering particles in the substrate is 5 ⁇
  • the haze and transmittance of the diffusion film of the present invention under a wavelength of 400 to 750 nm (violet wavelength to red wavelength) are greater than 80. %. Therefore, the diffusion film manufactured according to the embodiment of the present invention can solve the problem that the diffusion film existing in the prior art cannot take both haze and transmittance into consideration.
  • An embodiment of the present invention also provides a backlight module, which includes the diffusion film described above.
  • An embodiment of the present invention further provides a display panel (such as an OLED panel, a micro-LED panel, an LED panel, etc.).
  • the display panel has a backlight module, and the backlight module includes the diffusion film described above.
  • An embodiment of the present invention also provides a display device (such as a mobile phone, a television, a display screen, or any other display device, etc.).
  • the display device has a display panel, the display panel has a backlight module, and the backlight module
  • the group includes a diffusion film as described above.
  • An embodiment of the present invention also provides a method for manufacturing a diffusion film, including the following steps:
  • the absolute value of the difference in refractive index between the scattering particles and the organic resin is less than or equal to 0.25
  • the particle diameter of the scattering particles is between 1 ⁇ m and 6 ⁇ m
  • the scattering particles are in the
  • the weight percentage concentration in the organic resin is between 1 ⁇ and 12 ⁇ , thereby making the haze and transmittance of the diffusion film greater than 80%.
  • a method for manufacturing the diffusion film according to an embodiment of the present invention includes the following steps:
  • the mixture is injection-molded with a screw-type injection molding machine or a plunger-type injection molding machine to form an injection-molded article, where the screw temperature of the injection molding machine is 160 to 250 ° C, the head temperature is 220 to 260 ° C, and the main speed of the screw is 120 to 130 rpm and injection pressure of 10 to 80 MPa; and
  • the organic resin is polymethylmethacrylate (PMMA) with a refractive index of about 1.49 or polyethylene terephthalate (PET) with a refractive index of about 1.65.
  • PMMA polymethylmethacrylate
  • PET polyethylene terephthalate
  • the scattering particles are made of an organic material or an inorganic material
  • the organic material is an epoxy resin having a refractive index of about 1.58 or a polydimethylsiloxane (PDMS) having a refractive index of about 1.41.
  • a refractive index of the inorganic material is titanium dioxide (TiO2) of about 2.35, a refractive index of about 1.46, a silica (SiO 2) or zinc oxide having a refractive index of about 2 (ZnO).
  • the embodiment of the present invention provides a diffusion film and a manufacturing method thereof.
  • a commonly used organic transparent resin material is used as a substrate, and scattering particles with a particle size on the order of micrometers are incorporated.
  • the doped concentration of the scattering particles is used to make a diffusion film with high haze and high transmittance, so as to solve the problem that the existing diffusion film cannot take into account both haze and transmittance.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

一种扩散膜及其制作方法。扩散膜(1)包括一基材(11)及多个散射颗粒(12)，散射颗粒均匀分布在基材中。散射颗粒与基材之间的折射率差值的绝对值小于或等于0.25，散射颗粒的粒径在1微米至6微米之间，散射颗粒在基材中的重量百分比浓度在1‰至12‰之间，藉此使得扩散膜的雾度与透过率均大于80％。扩散膜利用注塑成型技术通过将散射颗粒与有机树脂基材混合后注塑而形成。

Description

扩散膜及其制作方法 技术领域
本发明涉及显示器的技术领域，特别涉及一种扩散膜及其制作方法。
 背景技术
扩散膜可以将点光源和线光源扩展为面光源，提高整体的显示效果，是各类显示设备中的重要组件。扩散膜之所以能够将点光源和线光源转换成面光源是靠内部的散射微粒将入射光散射到其他方向，其散射能力的强弱通过“雾度”来衡量。通常，显示设备中的扩散膜在提高雾度的同时，对亮度会造成损失，现有技术的扩散膜无法兼顾雾度与透过率。
因此，有必要提供一种扩散膜及其制作方法，以解决现有技术所存在的问题。
 技术问题
本发明的目的在于提供一种扩散膜及其制作方法，以解决现有技术所存在的扩散膜雾度与透过率无法兼顾雾度与透过率的问题。
 技术解决方案
为解决上述技术问题，本发明提供一种扩散膜，包括：
一基材；及
多个散射颗粒，所述散射颗粒均匀分布在所述基材中，
其中所述散射颗粒与所述基材之间的折射率的差值的绝对值小于或等于0.25，所述散射颗粒的粒径在1微米至6微米之间，及所述散射颗粒在所述基材中的重量百分比浓度在1‰至12‰之间，藉此使得所述扩散膜的雾度与透过率均大于80%。
根据本发明一优选实施例，所述基材由有机树脂制成，其中所述有机树脂是聚甲基丙烯酸甲酯或聚对苯二甲酸乙二醇酯；所述散射颗粒由有机材料或无机材料制成，其中所述有机材料是环氧树脂或聚二甲基硅氧烷，所述无机材料是二氧化钛、二氧化硅或氧化锌。
根据本发明一优选实施例，所述散射颗粒与所述基材之间的折射率的差值的绝对值为约0.07，所述散射颗粒的粒径为约4微米，及所述散射颗粒在所述基材中的重量百分比浓度为约5‰。
本发明还提供一种背光模组，其中，所述背光模组包括如上所述的扩散膜。
本发明还提供一种显示面板，所述显示面板具有一背光模组，其中，所述背光模组包括如上所述的扩散膜。
本发明还提供一种显示装置，所述显示装置具有一显示面板，所述显示面板具有一背光模组，其中，所述背光模组包括如上所述的扩散膜。
本发明还提供一种制作扩散膜的方法，包括以下步骤：
利用注塑成型技术将多个散射颗粒与一有机树脂混合并进行注塑，以形成所述扩散膜，
其中所述散射颗粒与所述有机树脂之间的折射率的差值的绝对值小于或等于0.25，所述散射颗粒的粒径在1微米至6微米之间，及所述散射颗粒在所述有机树脂中的重量百分比浓度在1‰至12‰之间，藉此使得所述扩散膜的雾度与透过率均大于80%。
根据本发明一优选实施例，所述方法更包括以下步骤：
将所述散射颗粒与所述有机树脂均匀混合，以形成一混合物；
在85℃下对所述混合物烘烤4小时；
采用螺杆式注塑机或者柱塞式注塑机将所述混合物进行注塑，以形成一注塑品，其中注塑机的螺杆温度在160至250℃，机头温度在220至260℃，螺杆的主转速在120至130转/分，注射压力在10至80 MPa；及
将注塑品置于70至80℃的热风循环干燥箱内长达4小时，藉此消除注塑品内部应力。
根据本发明一优选实施例，所述基材由有机树脂制成，其中所述有机树脂是聚甲基丙烯酸甲酯或聚对苯二甲酸乙二醇酯；所述散射颗粒由有机材料或无机材料制成，其中所述有机材料是环氧树脂或聚二甲基硅氧烷，所述无机材料是二氧化钛、二氧化硅或氧化锌。
根据本发明一优选实施例，所述散射颗粒与所述基材之间的折射率的差值的绝对值为约0.07，所述散射颗粒的粒径为约4微米，及所述散射颗粒在所述基材中的重量百分比浓度为约5‰。
 有益效果
相较于现有技术，本发明提出一种扩散膜及其制作方法。本发明以常用的有机透明树脂材料为基材，掺入微米量级粒径的散射颗粒，通过控制基材和散射颗粒之间的折射率的差值、散射颗粒的粒径尺寸、散射颗粒的掺入浓度来制作具有高雾度、高透过率的扩散膜，以解决现有技术所存在的扩散膜的雾度与透过率无法同时提升的问题。
 附图说明
图1为根据本发明一优选实施例的扩散膜的立体示意图。
图2显示根据本发明一优选实施例制作的扩散膜在各种波长的光通过下的雾度与透过率。
 本发明的实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。在图中，结构相似的单元是以相同标号表示。
本发明的实施例以常用的有机透明树脂材料为基材，掺入微米量级粒径的散射颗粒，通过控制基材和散射颗粒之间的折射率的差值、散射颗粒的粒径尺寸、散射颗粒的掺入浓度来制作具有高雾度、高透过率的扩散膜。针对散射颗粒的折射率、粒径尺寸和掺入浓度，说明如下：
1.关于散射颗粒的折射率：散射颗粒和其周围的基材介质之间的折射率彼此接近时，扩散膜整体的折射率均一性好，可使得向前散射的概率较大，向后散射的概率较小，扩散膜透过率较高。极端情况是散射颗粒的折射率完全等于基材的折射率，这种情况下，在扣除外部界面的反射损失，可被视为扩散膜是全透的，此时扩散膜的透过率即是理想情况下的最大值。
2.关于散射颗粒的粒径尺寸：散射颗粒的粒径尺寸较小时，对短波长的光散射效果较强，如此会增大短波长的光的散射效果。当散射颗粒的粒径尺寸增加时，如此会增大长波长的光的散射效果；而当散射颗粒的粒径尺寸达到一特定数值时，散射颗粒对蓝光~红光的散射能力基本一致，此时，扩散膜的扩散效果基本不随波长变化。此时的散射颗粒的粒径尺寸即为本发明的实施例所选择使用的散射颗粒粒径尺寸，此时的扩散膜基本不会产生色散，能够更好的应用在显示器中。
3.关于散射颗粒的掺入浓度：散射颗粒的掺入浓度影响光子的平均自由程。随着基材中的散射颗粒的掺入浓度增加，光子进入扩散膜后，经历的散射次数会增加，导致光子运动的平均自由程变小，向后散射效果增加，从而提高了扩散膜的雾度，降低了扩散膜的透过率。为了获得较高的透过率，散射颗粒的掺入浓度不能太高。然而，若散射颗粒的掺入浓度太小又会降低雾度，所以散射颗粒的掺入浓度亦是影响制作高雾度、高透过率的扩散膜的关键参数之一。
请参照图1，图1为根据本发明一优选实施例的扩散膜的立体示意图。
如图1所示，本发明的实施例提供一种扩散膜1。所述扩散膜1包括一基材11及多个散射颗粒12，所述散射颗粒12均匀分布在所述基材11中。根据本发明的实施例，所述散射颗粒12与所述基材11之间的折射率的差值的绝对值小于或等于(即不大于)0.25，所述散射颗粒12的粒径在1微米至6微米之间，及所述散射颗粒12在所述基材11中的重量百分比浓度在1‰至12‰之间，藉此使得所述扩散膜1的雾度与透过率均大于80%。
所述基材11由有机树脂制成，例如所述有机树脂是折射率为约1.49的聚甲基丙烯酸甲酯(PMMA)或折射率为约1.65的聚对苯二甲酸乙二醇酯(PET)。
此外，所述散射颗粒12由有机材料或无机材料制成，例如所述有机材料是折射率为约1.58的环氧树脂或折射率为约1.41的聚二甲基硅氧烷(PDMS)，所述无机材料是折射率为约2.35的二氧化钛(TiO2)、折射率为约1.46的二氧化硅(SiO 2)或折射率为约2的氧化锌(ZnO)。
根据本发明的实施例，将所述散射颗粒12与所述基材11之间的折射率的差值的绝对值限制在小于或等于0.25即可。另外，针对有机材料，例如PMMA、PS、环氧树脂、PDMS等，不同的合成条件可获得数值略微不同的折射率。甚至可以用同一类材料制备散射膜，例如，以一种折射率的PMMA作为所述基材11，另一种折射率的PMMA作为散射颗粒12，这能够减小所述散射颗粒12与所述基材11之间的应力，获得效果更优的扩散膜。
本申请发明人发现到，当所述散射颗粒12与所述基材11之间的折射率的差值的绝对值为0.1、所述散射颗粒12的粒径为1微米、所述散射颗粒12在所述基材11中的重量百分比浓度在1‰至12‰之间时，所述扩散膜的雾度为约10%至65%、透过率为95%至45%。当所述散射颗粒12与所述基材11之间的折射率的差值的绝对值为0.1、所述散射颗粒12的粒径为6微米、所述散射颗粒12在所述基材11中的重量百分比浓度在1‰至12‰之间时，所述扩散膜的雾度为约30%至95%、透过率为85%至30%。
又，本申请发明人发现到，当所述散射颗粒12与所述基材11之间的折射率的差值的绝对值为0.2、所述散射颗粒12的粒径为1微米、所述散射颗粒12在所述基材11中的重量百分比浓度在1‰至12‰之间时，所述扩散膜的雾度为约25%至80%、透过率为90%至25%。当所述散射颗粒12与所述基材11之间的折射率的差值的绝对值为0.2、所述散射颗粒12的粒径为6微米、所述散射颗粒12在所述基材11中的重量百分比浓度在1‰至12‰之间时，所述扩散膜的雾度为约45%至97%、透过率为70%至15%。
通过控制所述散射颗粒12与所述基材11之间的折射率的差值的绝对值、所述散射颗粒12的粒径尺寸、所述散射颗粒12在所述基材11中的重量百分比浓度，可以控制雾度与透过率的大小，其数值在10%~97%之间变化。因此可以适用于不同的应用场景。
请参照图2，图2显示根据本发明一优选实施例制作的扩散膜在各种波长的光通过下的雾度与透过率。如图2所示，在本实施例中，通过控制所述散射颗粒与所述基材之间的折射率的差值的绝对值为0.07，所述散射颗粒的粒径在为4微米，及所述散射颗粒在所述基材中的重量百分比浓度为5‰，本发明的扩散膜在波长400至750nm的光(紫光波长至红光波长)通过下的雾度与透过率均大于80%。因此，根据本发明的实施例制作的扩散膜可以解决现有技术所存在的扩散膜无法兼顾雾度与透过率的问题雾度与透过率。
本发明的实施例还提供一种背光模组，所述背光模组包括如上所述的扩散膜。
本发明的实施例还提供一种显示面板(例如OLED面板、micro-LED面板、LED面板等)，所述显示面板具有一背光模组，所述背光模组包括如上所述的扩散膜。
本发明的实施例还提供一种显示装置(例如手機、電視、顯示屏或任何其他顯示裝置等)，所述显示装置具有一显示面板，所述显示面板具有一背光模组，所述背光模组包括如上所述的扩散膜。
本发明的实施例还提供一种制作扩散膜的方法，包括以下步骤：
利用注塑成型技术将多个散射颗粒与一有机树脂混合并进行注塑，以形成所述扩散膜，
其中所述散射颗粒与所述有机树脂之间的折射率的差值的绝对值小于或等于0.25，所述散射颗粒的粒径在1微米至6微米之间，及所述散射颗粒在所述有机树脂中的重量百分比浓度在1‰至12‰之间，藉此使得所述扩散膜的雾度与透过率均大于80%。
更详细地说，根据本发明的实施例来制作所述扩散膜的方法包括以下步骤：
将所述散射颗粒与所述有机树脂均匀混合，以形成一混合物；
在85℃下对所述混合物烘烤4小时；
采用螺杆式注塑机或者柱塞式注塑机将所述混合物进行注塑，以形成一注塑品，其中注塑机的螺杆温度在160至250℃，机头温度在220至260℃，螺杆的主转速在120至130转/分，注射压力在10至80 MPa；及
将注塑品置于70至80℃的热风循环干燥箱内长达4小时，藉此消除注塑品内部应力。
所述有机树脂是折射率为约1.49的聚甲基丙烯酸甲酯(PMMA)或折射率为约1.65的聚对苯二甲酸乙二醇酯(PET)。
此外，所述散射颗粒由有机材料或无机材料制成，例如所述有机材料是折射率为约1.58的环氧树脂或折射率为约1.41的聚二甲基硅氧烷(PDMS)，所述无机材料是折射率为约2.35的二氧化钛(TiO2)、折射率为约1.46的二氧化硅(SiO 2)或折射率为约2的氧化锌(ZnO)。
相较于现有技术，本发明的实施例提出一种扩散膜及其制作方法。本发明的实施例以常用的有机透明树脂材料为基材，掺入微米量级粒径的散射颗粒，通过控制基材和散射颗粒之间的折射率的差值、散射颗粒的粒径尺寸、散射颗粒的掺入浓度来制作具有高雾度、高透过率的扩散膜，以解决现有技术所存在的扩散膜无法兼顾雾度与透过率的问题雾度与透过率。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (12)

  1. 一种扩散膜，包括：
    一基材；及
    多个散射颗粒，所述散射颗粒均匀分布在所述基材中，
    其中所述散射颗粒与所述基材之间的折射率的差值的绝对值小于或等于0.25，所述散射颗粒的粒径在1微米至6微米之间，及所述散射颗粒在所述基材中的重量百分比浓度在1‰至12‰之间，藉此使得所述扩散膜的雾度与透过率均大于80%；
    其中所述基材由有机树脂制成，所述有机树脂是聚甲基丙烯酸甲酯或聚对苯二甲酸乙二醇酯；
    其中所述散射颗粒由有机材料或无机材料制成，所述有机材料是环氧树脂或聚二甲基硅氧烷，所述无机材料是二氧化钛、二氧化硅或氧化锌。
  2. 根据权利要求1所述的扩散膜，其中，所述散射颗粒与所述基材之间的折射率的差值的绝对值为约0.07，所述散射颗粒的粒径为约4微米，及所述散射颗粒在所述基材中的重量百分比浓度为约5‰。
  3. 一种扩散膜，包括：
    一基材；及
    多个散射颗粒，所述散射颗粒均匀分布在所述基材中，
    其中所述散射颗粒与所述基材之间的折射率的差值的绝对值小于或等于0.25，所述散射颗粒的粒径在1微米至6微米之间，及所述散射颗粒在所述基材中的重量百分比浓度在1‰至12‰之间，藉此使得所述扩散膜的雾度与透过率均大于80%。
  4. 根据权利要求3所述的扩散膜，其中，
    所述基材由有机树脂制成，其中所述有机树脂是聚甲基丙烯酸甲酯或聚对苯二甲酸乙二醇酯；
    所述散射颗粒由有机材料或无机材料制成，其中所述有机材料是环氧树脂或聚二甲基硅氧烷，所述无机材料是二氧化钛、二氧化硅或氧化锌。
  5. 根据权利要求3所述的扩散膜，其中，所述散射颗粒与所述基材之间的折射率的差值的绝对值为约0.07，所述散射颗粒的粒径为约4微米，及所述散射颗粒在所述基材中的重量百分比浓度为约5‰。
  6. 一种背光模组，其中，所述背光模组包括如权利要求3至5中任一项所述的扩散膜。
  7. 一种显示面板，所述显示面板具有一背光模组，其中，所述背光模组包括如权利要求3至5中任一项所述的扩散膜。
  8. 一种显示装置，所述显示装置具有一显示面板，所述显示面板具有一背光模组，其中，所述背光模组包括如权利要求3至5中任一项所述的扩散膜。
  9. 一种制作扩散膜的方法，包括以下步骤：
    利用注塑成型技术将多个散射颗粒与一有机树脂混合并进行注塑，以形成所述扩散膜，
    其中所述散射颗粒与所述有机树脂之间的折射率的差值的绝对值小于或等于0.25，所述散射颗粒的粒径在1微米至6微米之间，及所述散射颗粒在所述有机树脂中的重量百分比浓度在1‰至12‰之间，藉此使得所述扩散膜的雾度与透过率均大于80%。
  10. 根据权利要求9所述的制作扩散膜的方法，其中，所述方法更包括以下步骤：
    将所述散射颗粒与所述有机树脂均匀混合，以形成一混合物；
    在85℃下对所述混合物烘烤4小时；
    采用螺杆式注塑机或者柱塞式注塑机将所述混合物进行注塑，以形成一注塑品，其中注塑机的螺杆温度在160至250℃，机头温度在220至260℃，螺杆的主转速在120至130转/分，注射压力在10至80 MPa；及
    将注塑品置于70至80℃的热风循环干燥箱内长达4小时，藉此消除注塑品内部应力。
  11. 根据权利要求9所述的制作扩散膜的方法，其中，
    所述有机树脂是聚甲基丙烯酸甲酯或聚对苯二甲酸乙二醇酯；
    所述散射颗粒由有机材料或无机材料制成，其中所述有机材料是环氧树脂或聚二甲基硅氧烷，所述无机材料是二氧化钛、二氧化硅或氧化锌。
  12. 根据权利要求9所述的制作扩散膜的方法，其中，所述散射颗粒与所述有机树脂之间的折射率的差值的绝对值为约0.07，所述散射颗粒的粒径为约4微米，及所述散射颗粒在所述有机树脂中的重量百分比浓度为约5‰。
PCT/CN2018/113259 2018-09-28 2018-11-01 扩散膜及其制作方法 WO2020062411A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/316,917 US20210364676A1 (en) 2018-09-28 2018-11-01 Diffuser film and method for manufacturing same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811139694.1 2018-09-28
CN201811139694.1A CN109031487A (zh) 2018-09-28 2018-09-28 扩散膜及其制作方法

Publications (1)

Publication Number Publication Date
WO2020062411A1 true WO2020062411A1 (zh) 2020-04-02

Family

ID=64615323

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/113259 WO2020062411A1 (zh) 2018-09-28 2018-11-01 扩散膜及其制作方法

Country Status (3)

Country Link
US (1) US20210364676A1 (zh)
CN (1) CN109031487A (zh)
WO (1) WO2020062411A1 (zh)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110928032B (zh) * 2019-12-13 2021-09-24 武汉华星光电技术有限公司 液晶显示面板及液晶显示装置
KR20230006459A (ko) * 2020-04-24 2023-01-10 니폰 제온 가부시키가이샤 적층 필름, 및 하드 코트층 형성 필름
CN111580191A (zh) * 2020-05-09 2020-08-25 惠州市华星光电技术有限公司 表面处理方法、抗眩光涂层及显示装置
US11543119B2 (en) * 2020-12-22 2023-01-03 Brightside Innovations LLC Portable diffused lighting system
CN114106523A (zh) * 2021-11-22 2022-03-01 四川长虹电器股份有限公司 一种高亮度高对比度高还原性显示膜片及其制备方法
CN114824131B (zh) * 2022-04-18 2023-06-30 武汉华星光电半导体显示技术有限公司 显示面板

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009237148A (ja) * 2008-03-26 2009-10-15 Asahi Kasei Corp 光拡散シート及びバックライトユニット
JP2010078888A (ja) * 2008-09-25 2010-04-08 Panasonic Electric Works Co Ltd 光学フィルム
CN102042554A (zh) * 2009-10-09 2011-05-04 颖台科技股份有限公司 复合式扩散膜结构及背光模块
CN102540289A (zh) * 2011-12-31 2012-07-04 宁波长阳科技有限公司 一种光学扩散膜及其制备方法
CN103135152A (zh) * 2011-11-21 2013-06-05 群康科技(深圳)有限公司 对称扩散膜及其平面显示器的应用
CN103257392A (zh) * 2010-11-23 2013-08-21 吴明番 一种覆盖有扩散膜层的导光体
CN103293575A (zh) * 2013-05-10 2013-09-11 张家港康得新光电材料有限公司 扩散增亮薄膜及其制造方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN208737024U (zh) * 2018-09-28 2019-04-12 武汉华星光电技术有限公司 扩散膜

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009237148A (ja) * 2008-03-26 2009-10-15 Asahi Kasei Corp 光拡散シート及びバックライトユニット
JP2010078888A (ja) * 2008-09-25 2010-04-08 Panasonic Electric Works Co Ltd 光学フィルム
CN102042554A (zh) * 2009-10-09 2011-05-04 颖台科技股份有限公司 复合式扩散膜结构及背光模块
CN103257392A (zh) * 2010-11-23 2013-08-21 吴明番 一种覆盖有扩散膜层的导光体
CN103135152A (zh) * 2011-11-21 2013-06-05 群康科技(深圳)有限公司 对称扩散膜及其平面显示器的应用
CN102540289A (zh) * 2011-12-31 2012-07-04 宁波长阳科技有限公司 一种光学扩散膜及其制备方法
CN103293575A (zh) * 2013-05-10 2013-09-11 张家港康得新光电材料有限公司 扩散增亮薄膜及其制造方法

Also Published As

Publication number Publication date
US20210364676A1 (en) 2021-11-25
CN109031487A (zh) 2018-12-18

Similar Documents

Publication Publication Date Title
WO2020062411A1 (zh) 扩散膜及其制作方法
US10522791B2 (en) Advanced light extraction structure
CN104541187B (zh) 用于提供显示器组件的方法和设备
US10050236B2 (en) Advanced light extraction structure
US10144842B2 (en) High refractive index nanocomposite layer
US20100068504A1 (en) Multiple-coating particle and anti-glare film having the same
CN103552329A (zh) 一种高性能反射膜及其制备方法
JP2014153708A (ja) 透明光拡散体及びこれを利用した透過型スクリーン
CN104371208A (zh) 高透高遮蔽性扩散板母料和制备方法及扩散板的制备方法
CN108058411A (zh) 一种双向拉伸制备量子点复合膜的方法
US11309508B2 (en) Multi-functional optical composite board having quantum dots of high uniformity
TW201520017A (zh) 塑料母粒及其製造方法
CN109581572A (zh) 一种量子点偏光片
JP6301576B2 (ja) 光拡散透過シート
TWI766779B (zh) 量子點複合材、應用其的光學膜及背光模組
CN214151117U (zh) 防蓝光扩散板
CN208737024U (zh) 扩散膜
TWI416160B (zh) 抗反射抗眩光學薄膜及其製造方法
KR20110094463A (ko) 반사방지막 제조방법 및 그로 인해 제조된 유기발광다이오드용 반사방지막
US20220340811A1 (en) Quantum-dot optical film and the method to make the same
KR102607132B1 (ko) 양자점 필름 및 이를 제조하는 방법
US20220339919A1 (en) Quantum-dot optical film and the method to make the same
TWI388603B (zh) 聚甲基丙烯酸甲酯粒子披覆二氧化矽的製備方法
JP7134123B2 (ja) 映像投影システム
Li et al. Injection molding and performance testing of quantum-dot diffusion plate

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18935955

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18935955

Country of ref document: EP

Kind code of ref document: A1