WO2020186438A1 - 一种多观察角度防窥膜及其制备方法 - Google Patents

一种多观察角度防窥膜及其制备方法 Download PDF

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Publication number
WO2020186438A1
WO2020186438A1 PCT/CN2019/078615 CN2019078615W WO2020186438A1 WO 2020186438 A1 WO2020186438 A1 WO 2020186438A1 CN 2019078615 W CN2019078615 W CN 2019078615W WO 2020186438 A1 WO2020186438 A1 WO 2020186438A1
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Prior art keywords
layer
privacy
viewing angle
peep
angle
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PCT/CN2019/078615
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English (en)
French (fr)
Inventor
付志峰
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深圳菲尔泰光电有限公司
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Priority to PCT/CN2019/078615 priority Critical patent/WO2020186438A1/zh
Publication of WO2020186438A1 publication Critical patent/WO2020186438A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering

Definitions

  • the invention relates to the technical field of display film materials, in particular to a multi-observation angle privacy film and a preparation method thereof.
  • Liquid crystal display is a type of display used in digital clocks and many portable computers.
  • the LCD display shows the use of two pieces of polarized material, between which is a liquid crystal solution.
  • the crystals When current passes through the liquid, the crystals are rearranged so that light cannot pass through them. Therefore, each crystal is like a shutter, which can allow light to pass through and block it.
  • Liquid crystal displays are currently developing towards the goal of being light, thin, short and small, and display products with a long history in computer peripherals are certainly no exception. With ease of portability and transportation as the prerequisite, traditional display methods such as CRT video tube displays and LED display panels are subject to factors such as excessive volume or huge power consumption, and cannot meet the actual needs of users.
  • the development of liquid crystal display technology is in line with the current trend of information products. Whether it is a right-angle display, low power consumption, small size, or zero radiation, users can enjoy the best visual environment.
  • the display is required to have a peep-proof function to prevent information leakage when using electronic products.
  • some privacy films have appeared on the market, which can be externally hung or attached to the outermost layer of the display.
  • the privacy film is used for the display, the data displayed on the screen can be exclusively for the user to read from the front.
  • the angle of the viewing area is 60 degrees ( ⁇ 30 degrees), and anyone outside the viewing area can only see Dark screen, so as to achieve the purpose of protecting personal privacy and corporate business secrets.
  • the angle of the visible area protected by the privacy film is fixed, and there are certain restrictions and limitations during use.
  • the invention provides a peep-proof film with multiple observation angles, which solves the problems of fixed angle of the visible area of the existing peep-proof film and inconvenient use.
  • the present invention is realized in this way.
  • a multi-view angle privacy film includes a first PET layer stacked one after another on any side of the first PET layer.
  • a first conductive layer is provided, a multi-view angle functional layer is provided on the side of the first conductive layer facing away from the first PET layer, and the wide viewing angle display privacy layer is facing away from the first conductive layer
  • a second conductive layer provided on one side of the layer and a second PET layer provided on the second conductive layer opposite to the multi-view angle functional layer; wherein, the multi-view angle functional layer includes a liquid crystal colloid layer and
  • the privacy structure between the liquid crystal colloid layers, the privacy structure is any one of a 180° privacy structure and a 360° privacy structure perpendicular to the direction of the first PET layer.
  • a method for preparing a privacy film with multiple viewing angles which includes the following steps:
  • a first PET layer is provided, a first conductive layer is prepared on the surface of the first PET layer, the privacy structure is prepared on the surface of the first conductive layer, and then a liquid crystal colloid layer is uniformly coated on the privacy
  • a functional layer with multiple observation angles on the surface of the structure a second conductive layer is prepared on the surface of the functional layer with multiple observation angles, and a second PET layer is prepared on the performance of the second conductive layer to obtain a multiple observation angle privacy film;
  • the multi-view angle functional layer is any one of a 180° privacy structure and a 360° privacy structure perpendicular to the direction of the first PET layer.
  • the multiple viewing angle privacy film is laminated with a first PET layer, a first conductive layer, a multiple viewing angle functional layer, a second conductive layer, and a second PET layer in sequence; wherein, the multiple viewing angle functional layer includes A liquid crystal colloid layer and a privacy structure arranged between the liquid crystal colloid layers, the privacy structure being any one of a 180° privacy structure and a 360° privacy structure perpendicular to the direction of the first PET layer .
  • the privacy film is energized for use, the incident light passes through the privacy structure.
  • the privacy structure it is 180° privacy structure and 360° privacy structure, which results in different light dispersion, and further achieves control of the light to prevent
  • a number of point light sources are formed on the surface of the peep film, and any one of 180° peep-proof structure and 360° peep-proof structure can be selected according to the actual application, so as to further make the viewing area angle of the multi-observation angle peep-proof film
  • a liquid crystal colloid layer is added to adjust the electro-optical performance and stability of the film, thereby obtaining a flexible display angle switchable film that can be applied to different display area requirements.
  • the flexible display angle switchable film can be adjusted according to the display Different display areas can be used to facilitate application and achieve better results.
  • the prepared multi-viewing angle privacy film is obtained by laminating film processing, and the preparation method is simple, does not require the use of complicated instruments and equipment, is convenient to operate, has high production efficiency, and is beneficial to large-scale preparation and use.
  • Figure 1 is a multi-viewing angle privacy film provided by an embodiment of the present invention.
  • the multi-viewing angle privacy film is sequentially laminated with a first PET layer 101, a first conductive layer 102, a 180° multi-view angle functional layer 103, and a second conductive layer.
  • FIG. 2 is a multi-view angle functional layer provided by an embodiment of the present invention.
  • the multi-view angle functional layer includes a 180° round table anti-peep structure 132 and a liquid crystal colloid layer 131;
  • Figure 3 is a multi-viewing angle privacy film provided by an embodiment of the present invention.
  • the multi-viewing angle privacy film is sequentially laminated with a first PET layer 201, a first conductive layer 202, a 360° multi-view angle functional layer 203, and a second Conductive layer 204, second PET layer 205;
  • FIG. 4 is a multi-view angle functional layer provided by an embodiment of the present invention.
  • the multi-view angle functional layer includes a 360° cylindrical privacy structure 232 and a liquid crystal colloid layer 231;
  • Fig. 5 is a peep-proof viewing angle test diagram of a normal viewing angle provided by an embodiment of the present invention and a multi-viewing-angle privacy film prepared by the present invention.
  • an example of the present invention provides a multi-observation angle privacy film.
  • the multi-observation angle privacy film is sequentially laminated with a first PET layer 101, a first conductive layer 102, and a 180° multi-observation angle functional layer 103.
  • the multi-view angle functional layer includes a liquid crystal colloid layer and a privacy structure perpendicular to the direction of the first PET layer arranged between the liquid crystal colloid layers.
  • the multi-view angle function The layers include a 180° round table anti-peep structure 132 and a liquid crystal colloid layer 131.
  • the 180° peep-proof structure is at least one of a black rectangular parallelepiped structure and a black truncated cone structure.
  • the cross section of the rectangular parallelepiped structure is a rectangle. More preferably, the rectangular cross section of the rectangular parallelepiped structure has a height of 20-100 ⁇ m and a width of 5-20 ⁇ m; the distance between two adjacent structures is 30-100 ⁇ m. The height of the cross section of the truncated cone structure is 20-100 ⁇ m, the width is 5-20 ⁇ m, and the bottom angle is 10°-30°; the distance between two adjacent structures is 30-100 ⁇ m.
  • the 360° privacy structure is at least one of a black cube and a black cylinder.
  • the multi-viewing angle privacy film is sequentially laminated with a first PET layer 201, a first conductive layer 202, a 360° multi-viewing angle functional layer 203, a second conductive layer 204, and a second PET layer 205.
  • the multi-view angle functional layer includes a 360° cylindrical privacy structure 232 and a liquid crystal colloid layer 231.
  • the side length of the square cross section of the cube structure is 20-100 ⁇ m, and the distance between two adjacent structures is 30-100 ⁇ m; the diameter of the square cross section of the cylindrical structure is 20-100 ⁇ m, and the center of the two adjacent circles The distance between them is 40-200 ⁇ m.
  • the size of the 180° privacy structure and the 360° privacy structure are too small in the privacy structure, when the incident light passes through the privacy structure, the incident light cannot be dispersed, and further control of the light cannot be achieved.
  • Several point light sources are formed on the surface of the peeping film; if the size of the peeping prevention structure is too large, the liquid crystal glue layer will not be able to completely cover the peeping prevention structure, which will affect the prepared multi-viewing angle anti-peeping film and prevent the peeping film from working use.
  • the thickness of the multiple observation angle privacy film is 120-300 ⁇ m. If the prepared multi-viewing angle privacy film is too thin, it is easy to be damaged during use, and it will further affect the thickness of the multi-viewing angle functional layer, resulting in poor anti-peeping effect; if the thickness of the multi-viewing angle privacy film is Too thick will cause material waste during the preparation process and increase the cost. Further preferably, the thickness of the multi-view angle functional layer is 20-100 ⁇ m.
  • the multi-observation angle functional layer is too thin, the height of each privacy structure is too low, resulting in uneven light dispersion control, inability to control the light well, and inability to form several point light sources on the surface of the privacy film, destroying the protection
  • the performance of the peeping film if the multi-view angle functional layer is too thick, it will affect the irradiation of parallel light, and the light cannot be well controlled, which will affect the anti-peeping effect.
  • the privacy structure material includes the following components by weight: 30%-50% Nematic liquid crystal, 40%-60% high molecular polymer, 1%-3% Initiator, 0.5%-2% glass beads.
  • the weight of the raw material of the privacy structure is 100%, and the weight of the nematic liquid crystal is 30%-50%. If the amount of addition is large, the addition amount and addition ratio of other added substances in the liquid crystal colloid layer will be reduced, which will further affect the structural performance of the liquid crystal colloid layer; if the addition amount is too small, the prepared liquid crystal colloid layer will be affected after the current is applied. The accuracy and fluidity of the response.
  • the content of nematic liquid crystal in the anti-peep structure raw material may specifically be 30%, 35%, 40%, 45%, and 50%.
  • the nematic liquid crystal is composed of rod-shaped molecules with a large aspect ratio. It has fluidity similar to ordinary liquids.
  • the molecules are not arranged in layers. They can slide up and down, left and right, and back and forth, only on the long axis of the molecule. The directions remain parallel or nearly parallel to each other.
  • the use of this liquid crystal as the main component material of the anti-peep structure is because this liquid crystal is twisted in its natural state. When current is applied to this liquid crystal, they will reversely twist the corresponding angle according to the magnitude of the applied voltage. . Therefore, nematic liquid crystals are added to the privacy structure.
  • positive nematic liquid crystals are preferably used.
  • the use of this liquid crystal has a very precise response to current, so the prepared anti-peep structure can effectively control the flow of light.
  • the positive nematic liquid crystal has low viscosity and strong fluidity.
  • the molecules of the positive nematic liquid crystal can move freely along the long axis direction, which is beneficial to control the light.
  • the positive nematic liquid crystal is selected from at least one of E44, SLC-7011, E8 and SLC1717, and more preferably at least one of SLC-7011, E8 and SLC1717.
  • the weight of the anti-peep structure raw material is 100%, and the addition amount of the high molecular polymer is 40%-60%. If the amount added is large, the amount and proportion of other additives added to the privacy structure will be reduced, which will further affect the structural performance of the privacy structure; if the addition amount is too small, the polymerization effect of the privacy structure will be affected, making the privacy structure impossible Completely wrap each anti-peep structure to affect the anti-peep effect.
  • the polymerizable monomer content may specifically be 40%, 45%, 50%, 55%, and 60%.
  • the high molecular polymer is selected from any one of ultraviolet polymer and thermal polymer.
  • the ultraviolet polymer is selected from polyalkyl acrylate bornyl acrylate, polyolefin acrylate, ⁇ -hydroxyethyl methacrylate, propylene oxide neopentyl glycol dimethacrylate, tripropylene glycol diacrylate and One or more of pentaerythritol triacrylate.
  • the ultraviolet polymer is preferably polyalkyl borneol acrylate, polyolefin acrylate, ⁇ -hydroxyethyl methacrylate and pentaerythritol triacrylate. ester.
  • the thermal polymer is selected from at least one of bisphenol type epoxy resin, bisphenol type epoxy resin, and hydrogenated bisphenol type epoxy resin.
  • the initiator is selected from one of ultraviolet curing initiators and thermal curing initiators.
  • the ultraviolet curing initiator absorbs the ultraviolet quantum emitted by the strong ultraviolet light, thereby initiating the polymerization, cross-linking and grafting reaction of each polymerizable monomer, so that a solid film is formed within a fraction of a second in the liquid.
  • the UV curing initiator is selected from one or more of Irgacure 2022, Irgacure 184, Irgacure 1173 and Irgacure 651; in a preferred embodiment of the present invention, the UV curing initiator preferably added is at least one of Irgacure 1173 and Irgacure 651.
  • the thermal curing initiator is selected from at least one of ethylenediamine, diethylenetriamine, triethylenetetramine, and polyethylene polyamine.
  • the UV curing initiator when the UV polymer is added, the UV curing initiator is selected; when the thermal polymer is selected, the thermal curing initiator is selected.
  • the addition amount of the initiator is 1% to 3%.
  • the addition amount of the initiator is proportional to the addition amount of the polymerizable monomer and the positive nematic liquid crystal. If the addition amount changes, it will affect the structural performance of the prepared anti-peep structure.
  • the content of the initiator may specifically be 1%, 2%, and 3%.
  • the addition amount of the glass beads is 0.5%-2%.
  • the glass beads are added to play a supporting role and improve the support of the privacy structure. If the amount added is too small, the mixing in the material will not be uniform enough to play a supporting role; if the amount added is too large, it will affect the proportion of other added substances and affect the nature of the anti-peep structure.
  • the content of the glass beads may specifically be 0.5%, 1%, 1.5%, and 2%.
  • the raw material of the liquid crystal colloid layer includes the following components by weight: 30%-70% Nematic liquid crystal; 20%-60% high molecular polymer; 1%-3% Initiator.
  • the first PET layer and the second PET layer are both transparent layers.
  • the surface of the first PET layer and the surface of the second PET layer are microstructured surfaces.
  • the microstructure surface is a surface provided with microprotrusion structures.
  • conventional coating equipment can be used to coat the surface of the first PET layer and the surface of the second PET layer with particles to obtain a microstructure with protrusions formed on the surface, which has an anti-adsorption effect.
  • both the first conductive layer and the second conductive layer are transparent layers.
  • the material of the conductive layer should have high electrical conductivity, good mechanical properties, processing performance, atmospheric corrosion resistance, and high chemical stability. More preferably, the materials of the first conductive layer and the second conductive layer should be separate Any one selected from indium tin oxide, nano silver or graphene.
  • the working voltage of the multi-viewing-angle privacy film is 5-50V
  • the left-right observation angle is 60-80° when the viewing angle is narrow
  • the left-right observation angle is 140-160° when the wide viewing angle is wide.
  • the transmittance of the film under both viewing angles is greater than 80%.
  • a multi-viewing angle privacy film prepared by the present invention, the first PET layer, the first conductive layer, the multi-viewing angle functional layer, the second conductive layer, and the second PET layer; wherein, the multi-view angle functional layer includes a liquid crystal colloid layer and an anti-peep structure disposed between the liquid crystal colloid layers, and the anti-peep structure is a 180° anti-peeping structure perpendicular to the direction of the first PET layer Either a peeping structure and a 360° peeping structure.
  • the privacy structure it is 180° privacy structure and 360° privacy structure, which results in different light dispersion, and further achieves control of the light to prevent
  • a number of point light sources are formed on the surface of the peep film, and any one of 180° peep-proof structure and 360° peep-proof structure can be selected according to the actual application, so as to further increase the angle of the visible area of the multi-observation angle
  • a liquid crystal colloid layer is added to adjust the electro-optical performance and stability of the film, thereby obtaining a flexible display angle switchable film that can be applied to different display area requirements.
  • the flexible display angle switchable film can be adjusted according to the display Different display areas can be used to facilitate application and achieve better results.
  • the embodiment of the present invention also provides a method for preparing a privacy film with multiple viewing angles.
  • the method includes the following steps:
  • the surface of the privacy structure has multiple observation angle functional layers, a second conductive layer is prepared on the surface of the multiple observation angle functional layer, and a second PET layer is prepared on the performance of the second conductive layer to obtain a multiple observation angle privacy film;
  • the multi-view angle functional layer is any one of a 180° privacy structure and a 360° privacy structure perpendicular to the direction of the first PET layer.
  • a first PET layer is provided, a first conductive layer is prepared on the surface of the first PET layer, the privacy structure is prepared on the surface of the first conductive layer, and then the liquid crystal colloid layer Evenly coat the multi-view angle functional layer on the surface of the privacy structure, prepare a second conductive layer on the surface of the multi-view angle functional layer, prepare a second PET layer on the performance of the second conductive layer to obtain more observation Angle privacy film; wherein, the multi-view angle functional layer is any one of a 180° privacy structure and a 360° privacy structure perpendicular to the direction of the first PET layer. Specifically, any one of 180° anti-peeping structure and 360° anti-peeping structure can be selected according to requirements.
  • the preparation method of the multi-view angle functional layer is:
  • G01 Provide the positive nematic liquid crystal, high molecular polymer, initiator, glass beads and carbon black to mix to obtain a privacy structure;
  • the anti-peep structure is vertically coated on any conductive film substrate to prepare a prefabricated film
  • G03. Provide the positive nematic liquid crystal, high molecular polymer, initiator, glass beads for mixing to obtain a liquid crystal colloid layer;
  • the liquid crystal colloid layer is uniformly coated on the prefabricated film and cured to obtain a multi-view angle functional layer.
  • step G01 the positive nematic liquid crystal, high molecular polymer, initiator, glass beads and carbon black are provided and mixed to obtain a privacy structure.
  • the mixing can be a conventional method such as stirring, and the main thing is to mix the components uniformly.
  • the privacy structure is vertically coated on any conductive film substrate to prepare a prefabricated film.
  • the prepared privacy structure is perpendicular to any conductive film substrate to make The material performance effect obtained by subsequent preparation is better.
  • the positive nematic liquid crystal, high molecular polymer, initiator, and glass beads are provided and mixed to obtain a liquid crystal colloidal layer; preferably, the mixing can be a conventional method such as stirring That is, it is mainly to mix the components uniformly.
  • the liquid crystal colloid layer is uniformly coated on the prefabricated film, covered with the anti-peep structure, and then cured to obtain a multi-view angle functional layer.
  • the polymerizable monomer in the preparation of the multi-observation angle functional layer is an ultraviolet light polymerizable monomer and the initiator is an ultraviolet light initiator
  • the curing method is ultraviolet Light curing is used to prepare privacy film materials, and the UV curing time is 3-5 min.
  • the curing method is a thermal curing method, the curing temperature is 80°C, and the curing time is 3 hours.
  • the multi-observation-angle privacy film prepared by the present invention is obtained by laminating film processing.
  • the preparation method is simple, does not require the use of complicated instruments and equipment, is convenient to operate, has high production efficiency, and is beneficial to large-scale preparation and use.
  • the multiple observation angle functional layer in the multiple observation angle privacy film includes a privacy structure and a liquid crystal colloid layer, and the privacy structure is a 180° privacy structure.
  • the anti-peep structure of the circular truncated cone structure is uniformly prepared.
  • the cross section of the truncated cone is a trapezoidal cross section, the height is 80um, the width of the lower bottom surface is 15um, and the angle of the bottom angle is 15°.
  • the preparation method of the liquid crystal colloidal layer mixing 60% nematic liquid crystal, 38% ultraviolet polymer, and 2% ultraviolet initiator to obtain a liquid crystal colloid layer, and coating the liquid crystal colloid layer on the truncated cone
  • For the peep structure set the distance between two adjacent circular table peep-proof structures to 50um, and select the UV curing method, and the curing time is 5 min, to prepare a multi-view angle functional layer.
  • the method for preparing a privacy film with multiple viewing angles provide a first PET layer, prepare a first conductive layer on the surface of the first PET layer, prepare the privacy structure on the surface of the first conductive layer, and then combine the liquid crystal colloid The layer is uniformly coated on the surface of the anti-peep structure, and a second conductive layer is prepared on the surface of the multi-view angle functional layer, and a second PET layer is prepared on the surface of the second conductive layer to obtain more Observation angle privacy film.
  • the multiple observation angle functional layer in the multiple observation angle privacy film includes a privacy structure and a liquid crystal colloid layer, and the privacy structure is a 360° privacy structure.
  • the cylindrical cross section is a square cross section, and the side length of the square is 40 um.
  • the preparation method of the liquid crystal colloid layer is: mixing 60% nematic liquid crystal, 38% thermal polymer, and 2% thermal curing initiator to obtain a liquid crystal colloid layer, and coating the liquid crystal colloid layer on the cylindrical Set the distance between two adjacent cylindrical anti-peep structures to be 90 um, and use a thermal curing method for curing, with a curing temperature of 80° C. and a time of 3 hours, to prepare a multi-view angle functional layer.
  • the method for preparing a privacy film with multiple viewing angles provide a first PET layer, prepare a first conductive layer on the surface of the first PET layer, prepare the privacy structure on the surface of the first conductive layer, and then combine the liquid crystal colloid The layer is uniformly coated on the surface of the anti-peep structure, and a second conductive layer is prepared on the surface of the multi-view angle functional layer, and a second PET layer is prepared on the surface of the second conductive layer to obtain more Observation angle privacy film.
  • the anti-peeping film with multiple observation angles prepared as described above will be tested to test its anti-peeping angle of view.
  • the test results are shown in Figure 5 below.
  • the left and right observation angles at a narrow viewing angle are 60-80°
  • the left and right viewing angles at a wide viewing angle are 140-160°.
  • the transmittance of the film under both viewing angles is greater than 80%.

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  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Chemical & Material Sciences (AREA)
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Abstract

一种多观察角度防窥膜，依次层叠第一PET层（101，201），第一导电层（102，202），多观察角度功能层（103，203），第二导电层（104，204），第二PET层（105，205）；其中，多观察角度功能层（103，203）包括液晶胶体层（131，231）以及设置在所述液晶胶体层之间的防窥结构（132，232），防窥结构（132，232）为垂直于第一PET层（101）方向的180°防窥结构（132）和360°防窥结构（232）的任一一种。使防窥膜通电进行使用时，入射光经过防窥结构，根据防窥结构分别为180°防窥结构（132）和360°防窥结构（232），导致光线的分散情况不同，进一步达到对光线进行控制，使防窥膜表面形成若干个点光源，进一步地使该多观察角度防窥膜的可视区域角度发生改变，方便应用，以期达到更好的效果。

Description

一种多观察角度防窥膜及其制备方法 技术领域
本发明涉及显示膜材料技术领域，尤其涉及一种多观察角度防窥膜及其制备方法。
 背景技术
随着现代科学技术的飞速发展，电脑、手机等电子产品越来越多的应用于人们的工作和生活中，为人们带来了极大的便利和乐趣。电子产品主要是利用液晶显示屏进行信息的表现。
液晶显示屏是一种用于数字型钟表和许多便携式计算机的一种显示器类型。液晶显示屏显示使用了两片极化材料，在它们之间是液体水晶溶液。电流通过该液体时会使水晶重新排列，以使光线无法透过它们。因此，每个水晶就像百叶窗，既能允许光线穿过又能挡住光线。液晶显示器目前科技信息产品都朝着轻、薄、短、小的目标发展，在计算机周边中拥有悠久历史的显示器产品当然也不例外。在便于携带与搬运为前题之下，传统的显示方式如CRT映像管显示器及LED显示板等等，皆受制于体积过大或耗电量甚巨等因素，无法达成使用者的实际需求。而液晶显示技术的发展正好切合目前信息产品的潮流，无论是直角显示、低耗电量、体积小、还是零辐射等优点，都能让使用者享受最佳的视觉环境。
然而，在人们广泛使用电子产品的同时，由于电子产品屏幕可视角度较大，人们在通过屏幕浏览资料时很容易被他人偷窥，造成个人隐私及企业商业机密面临着极大的风险。因此，在某些场合，需要显示器具有防窥功能来防止在使用电子产品时信息泄露。目前，市面上已经出现了一些防窥膜，这些防窥膜可外挂或外贴于显示器最外层。当将该防窥膜用于显示器时，可使屏幕显示出的资料专供使用者正面阅读，可视区域的角度为60度(士30度)，任何人在可视区域外只能看到漆黑画面，从而达到保护个人隐私和企业商业机密的目的。但是，这种防窥膜所保护的可视区域的角度是固定的，在使用过程中存在一定的限制性及局限性。
 技术问题
本发明提供了一种多观察角度防窥膜，解决现有的防窥膜的可视区域角度固定、使用不方便的问题。
 技术解决方案
本发明是这样实现的，第一方面，提供了一种多观察角度防窥膜，所述多观察角度防窥膜包括依次层叠设置的第一PET层、在所述第一PET层的任一面设置的第一导电层、在所述第一导电层背对着所述第一PET层的一面设置的多观察角度功能层、在所述广视角显示防窥层背对着所述第一导电层的一面设置的第二导电层和在所述第二导电层背对着所述多观察角度功能层设置的第二PET层；其中，所述多观察角度功能层包括液晶胶体层以及设置在所述液晶胶体层之间的防窥结构，所述防窥结构为垂直于所述第一PET层方向的180°防窥结构和360°防窥结构的任一一种。
第二方面，提供了一种多观察角度防窥膜的制备方法，包括如下步骤：
提供第一PET层，在所述第一PET层的表面制备第一导电层，在所述第一导电层的表面制备所述防窥结构，再将液晶胶体层均匀涂覆于所述防窥结构表面得多观察角度功能层，在所述多观察角度功能层的表面制备第二导电层，在所述第二导电层的表现制备第二PET层得到多观察角度防窥膜；其中，所述多观察角度功能层为垂直于所述第一PET层的方向的180°防窥结构和360°防窥结构的任一一种。
 有益效果
本发明中，所述多观察角度防窥膜依次层叠第一PET层，第一导电层，多观察角度功能层，第二导电层，第二PET层；其中，所述多观察角度功能层包括液晶胶体层以及设置在所述液晶胶体层之间的防窥结构，所述防窥结构为垂直于所述第一PET层方向的180°防窥结构和360°防窥结构的任一一种。当防窥膜通电进行使用时，入射光经过防窥结构，根据防窥结构分别为180°防窥结构和360°防窥结构，导致光线的分散情况不同，进一步达到对光线进行控制，使防窥膜表面形成若干个点光源，并且可以根据实际应用选择180°防窥结构和360°防窥结构的任一一种防窥结构，进一步地使该多观察角度防窥膜的可视区域角度发生改变，此外，添加了液晶胶体层可调节薄膜的电光性能和稳定性能，从而得到一种可以应用于不同显示面积需求的柔性显示角度可切换薄膜，该柔性显示角度可切换薄膜可根据显示器的显示面积不同进行使用，方便应用，以期达到更好的效果。
本发明中，制备得到的多观察角度防窥膜是通过层叠覆膜处理得到的，该制备方法简单，不需要使用复杂的仪器设备，操作方便，生产效率高效，有利于大规模制备及使用。
 附图说明
图1是本发明实施例提供的多观察角度防窥膜，所述多观察角度防窥膜依次层叠第一PET层101，第一导电层102，180°多观察角度功能层103，第二导电层104，第二PET层105；
图2是是本发明实施例提供的多观察角度功能层，所述多观察角度功能层包括180°圆台防窥结构132和液晶胶体层131；
图3是是本发明实施例提供的多观察角度防窥膜，所述多观察角度防窥膜依次层叠第一PET层201，第一导电层202，360°多观察角度功能层203，第二导电层204，第二PET层205；
图4是是本发明实施例提供的多观察角度功能层，所述多观察角度功能层包括360°圆柱防窥结构232和液晶胶体层231；
图5是本发明实施例提供的正常视角及本发明制备得到的多观察角度防窥膜的防窥视角测试图。
 本发明的实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本发明实例提供一种多观察角度防窥膜，如说明书附图1，所述多观察角度防窥膜依次层叠第一PET层101，第一导电层102，180°多观察角度功能层103，第二导电层104，第二PET层105。其中，所述多观察角度功能层包括液晶胶体层以及设置在所述液晶胶体层之间的垂直于所述第一PET层方向的防窥结构，如说明书附图2，所述多观察角度功能层包括180°圆台防窥结构132和液晶胶体层131。
优选的，所述180°防窥结构为黑色长方体结构和黑色圆台结构的至少一种。其中，所述长方体结构的横截面为长方形，进一步优选的，所述长方体结构的长方形横截面的高度为20-100μm，宽度为5-20μm；相邻两个结构之间的间距为30-100μm；所述圆台结构的横截面的高度为20-100μm，宽度为5-20μm，底角的角度为10°-30°；相邻两个结构之间的间距为30-100μm。
优选的，所述360°防窥结构为黑色正方体和黑色圆柱体的至少一种。如说明书附图3，所述多观察角度防窥膜依次层叠第一PET层201，第一导电层202，360°多观察角度功能层203，第二导电层204，第二PET层205。如说明书附图4，所述多观察角度功能层包括360°圆柱防窥结构232和液晶胶体层231。所述正方体结构正方形横截面的边长为20-100μm，相邻两个结构之间的距离为30-100μm；所述圆柱体结构正方形横截面的直径为20-100μm，相邻两个圆心之间的距离为40-200μm。
若所述防窥结构中，180°防窥结构和360°防窥结构的尺寸太小，则当入射光经过防窥结构，无法分散各入射光线，进一步无法达到对光线进行控制，无法使防窥膜表面形成若干个点光源；若防窥结构的尺寸太大，则液晶胶层无法将防窥结构完全包覆，会影响制备得到的多观察角度防窥膜，使防窥膜无法正常进行使用。
优选的，所述多观察角度防窥膜的厚度为120-300μm。若制备得到的多观察角度防窥膜太薄，在使用过程中容易受到损坏，同时也会进一步影响多观察角度功能层的厚度，导致防窥视效果较差；若多观察角度防窥膜的厚度太厚，在制备过程中导致材料浪费，使成本增加。进一步优选的，所述多观察角度功能层的厚度为20-100 μm。若多观察角度功能层太薄，则各防窥结构的高度太低，导致对光线分散控制不均匀，无法对光线进行良好地控制，无法使防窥膜表面形成若干个点光源，破坏了防窥膜额性能；若多观察角度功能层太厚，则会影响平行光的照射，无法对光线进行良好地控制，影响防窥效果。
优选的，以所述防窥结构原料的总质量为100%计，所述防窥结构原料包括如下重量份的组分：30%-50% 向列相液晶、40%-60% 高分子聚合物、1%-3% 引发剂、0.5%-2% 玻璃微珠。
优选的，以所述防窥结构原料的重量为100%，所述向列相液晶的重量为30%~50%。若添加量较多，会减少液晶胶体层其他添加物质的添加量及添加比例，会进一步影响液晶胶体层的结构性能；若添加量过少，则制备得到的液晶胶体层通上电流之后，影响其反应的精确性及流动性。本发明一些具体实施例中，在防窥结构原料中，向列相液晶含量具体可以为30%、35%、40%、45%和50%。
进一步优选的，向列相液晶是由长径比很大的棒状分子所组成，具有类似于普通液体的流动性，分子不排列成层，它能上下、左右、前后滑动，只在分子长轴方向上保持相互平行或近于平行。利用这种液晶作为防窥结构的主要组成材料，是由于这种液晶在自然状态下是扭曲的，当给这种液晶加上电流后，它们将依所加电压的大小反向扭曲相应的角度。因此，在防窥结构中加入向列相液晶，本在发明优选实施例中，优选使用正性向列相液晶。利用这种液晶对于电流的反应很精确，因此可以使制备得到的防窥结构能够有效地控制光的流通。此外，正性向列相液晶的粘度小，流动性强，当防窥膜导电后，正性向列相液晶各个分子可以顺着长轴方向自由移动，有利于对光线进行控制。在本发明优选实施例中，所述正性向列相液晶选自E44、SLC-7011、E8和SLC1717中的至少一种，进一步优选SLC-7011、E8和SLC1717的至少一种。
优选的，以所述防窥结构原料的重量为100%，所述高分子聚合物的添加量为40%-60%。若添加量较多，会减少防窥结构其他添加物质的添加量及添加比例，会进一步影响防窥结构的结构性能；若添加量过少，影响防窥结构的聚合效果，使防窥结构无法完整地将各个防窥结构进行完整地包覆，影响防窥效果。本发明一些具体实施例中，在防窥结构原料中，所述可聚合单体含量具体可以为40%、45%、50%、55%和60%。
所述高分子聚合物选自紫外聚合物和热聚合物的任一一种。其中，紫外聚合物选自多烷基丙烯酸冰片酯、聚烯烃丙烯酸酯、甲基丙烯酸-β-羟乙基酯、丙氧化新戊二醇二甲基丙烯酸酯、二缩三丙二醇二丙烯酸酯和季戊四醇三丙烯酸酯中的一种或几种，在本发明优选实施例中，紫外聚合物优选多烷基丙烯酸冰片酯、聚烯烃丙烯酸酯、甲基丙烯酸-β-羟乙基酯和季戊四醇三丙烯酸酯。热聚合物选自双酚型环氧树脂、双酚型环氧树脂、氢化双酚型环氧树脂中的至少一种。
优选的，所述引发剂选自紫外固化引发剂和热固化引发剂的一种。紫外固化引发剂是通过吸收强紫外灯光发射的紫外量子，从而引发各可聚合单体聚合交联和接枝反应，使液体几分之一秒内形成固态薄膜。优选的，紫外固化引发剂选自Irgacure2022、Irgacure184、Irgacure1173和Irgacure651的一种或几种；在本发明优选实施例中，优选添加的紫外固化引发剂为Irgacure1173和Irgacure651的至少一种。所述热固化引发剂剂选自乙二胺、二乙烯三胺、三乙烯四胺、多乙烯多胺中的至少一种。
在本发明优选实施例中，选择添加紫外聚合物则选用添加紫外固化引发剂；选择添加热聚合物则选用添加热固化引发剂。
优选的，所述引发剂的添加量为1%~3%。引发剂的添加量与所添加的可聚合单体、正性向列相液晶的添加量成一定比例，若添加量变化，则会影响制备得到的防窥结构的结构性能。本发明一些具体实施例中，在防窥结构原料中，所述引发剂的含量具体可以为1%、2%和3%。
优选的，所述玻璃微珠的添加量为0.5%~2%。添加所述玻璃微珠，是为了起到支撑的作用，提高防窥结构的支撑性。若添加量太少，在材料中混合不够均匀，无法起到支撑的作用；若添加量太多，影响其他添加物质的比例，影响防窥结构的性质。本发明一些具体实施例中，在防窥结构原料中，所述玻璃微珠的含量具体可以为0.5%、1%、1.5%和2%。
优选的，以所述液晶胶体层原料的总质量为100%计，所述液晶胶体层原料包括如下重量份的组分：30%-70% 向列相液晶；20%-60% 高分子聚合物；1%-3% 引发剂。
优选的，所述第一PET层和所述第二PET层均为透明层。进一步优选的，所述第一PET层的表面和所述第二PET层的表面为微结构表面。具体优选的，所述微结构表面为设置微凸起结构的表面。具体的，可常规涂覆设备对所述第一PET层的表面和所述第二PET层的表面进行粒子涂覆得到表面形成凸起的微结构，起到防吸附作用。
优选的，第一导电层和第二导电层均为透明层。所述的导电层的材料应具有高电导率，良好的机械性能、加工性能，耐大气腐蚀，化学稳定性高，进一步优选的，所述第一导电层和所述第二导电层的材料单独选自氧化铟锡、纳米银或石墨烯的任一一种。
优选的，所述多观察角度防窥膜工作电压为5-50V、窄视角时左右观察角度是60-80°、宽视角时左右观察角度是140-160°。两种视角下薄膜透过率均大于80%。
综上，本发明制备得到的一种多观察角度防窥膜，所述多观察角度防窥膜依次层叠第一PET层，第一导电层，多观察角度功能层，第二导电层，第二PET层；其中，所述多观察角度功能层包括液晶胶体层以及设置在所述液晶胶体层之间的防窥结构，所述防窥结构为垂直于所述第一PET层方向的180°防窥结构和360°防窥结构的任一一种。当防窥膜通电进行使用时，入射光经过防窥结构，根据防窥结构分别为180°防窥结构和360°防窥结构，导致光线的分散情况不同，进一步达到对光线进行控制，使防窥膜表面形成若干个点光源，并且可以根据实际应用选择180°防窥结构和360°防窥结构的任一一种防窥结构，进一步地使该多观察角度防窥膜的可视区域角度发生改变，此外，添加了液晶胶体层可调节薄膜的电光性能和稳定性能，从而得到一种可以应用于不同显示面积需求的柔性显示角度可切换薄膜，该柔性显示角度可切换薄膜可根据显示器的显示面积不同进行使用，方便应用，以期达到更好的效果。
相应地，本发明实施例还提供了一种多观察角度防窥膜的制备方法。该方法包括如下步骤：
S01. 提供第一PET层，在所述第一PET层的表面制备第一导电层，在所述第一导电层的表面制备所述防窥结构，再将液晶胶体层均匀涂覆于所述防窥结构表面得多观察角度功能层，在所述多观察角度功能层的表面制备第二导电层，在所述第二导电层的表现制备第二PET层得到多观察角度防窥膜；其中，所述多观察角度功能层为垂直于所述第一PET层的方向的180°防窥结构和360°防窥结构的任一一种。
具体的，上述步骤S01中，提供第一PET层，在所述第一PET层的表面制备第一导电层，在所述第一导电层的表面制备所述防窥结构，再将液晶胶体层均匀涂覆于所述防窥结构表面得多观察角度功能层，在所述多观察角度功能层的表面制备第二导电层，在所述第二导电层的表现制备第二PET层得到多观察角度防窥膜；其中，所述多观察角度功能层为垂直于所述第一PET层的方向的180°防窥结构和360°防窥结构的任一一种。具体的，可根据需求选择180°防窥结构和360°防窥结构的任一一种。
优选的，所述多观察角度功能层的制备方法为：
G01. 提供所述正性向列相液晶、高分子聚合物、引发剂、玻璃微珠和炭黑进行混合，得到防窥结构；
G02. 将所述防窥结构垂直涂覆于任一导电薄膜基材制备得到预制膜；
G03. 提供所述正性向列相液晶、高分子聚合物、引发剂、玻璃微珠进行混合，得到液晶胶体层；
G04. 将所述液晶胶体层均匀涂覆于所述预制膜上，进行固化，得到多观察角度功能层。
具体的，上述步骤G01中，提供所述正性向列相液晶、高分子聚合物、引发剂、玻璃微珠和炭黑进行混合，得到防窥结构。优选的，所述混合可为搅拌等常规的方法即可，主要是将各组分混合均匀。
具体的，在上述步骤G02中，将所述防窥结构垂直涂覆于任一导电薄膜基材制备得到预制膜，优选的，使制备得到的防窥结构垂直于任一导电薄膜基材，使后续制备得到的材料性能效果更好。
具体的，在上述步骤G03中，提供所述正性向列相液晶、高分子聚合物、引发剂、玻璃微珠进行混合，得到液晶胶体层；优选的，所述混合可为搅拌等常规的方法即可，主要是将各组分混合均匀。
具体的，在上述步骤G04中，将所述液晶胶体层均匀涂覆于所述预制膜上，包覆防窥结构，再进行固化，得到多观察角度功能层。在本发明优选实施例中，若制备多观察角度功能层中所述可聚合单体选用紫外光可聚合单体及引发剂选用紫外光引发剂，则在步骤G04中，所述固化方法选择紫外光固化进行防窥膜材料的制备，紫外光固化的时间为3-5min。若制备多观察角度功能层中所述可聚合单体选用热聚合单体和热固化引发剂，则在步骤G04中，所述固化方法选择热固化的方法，固化温度为80℃，固化时间为3小时。
本发明的制备得到的多观察角度防窥膜是通过层叠覆膜处理得到的，该制备方法简单，不需要使用复杂的仪器设备，操作方便，生产效率高效，有利于大规模制备及使用。
现以一种多观察角度防窥膜、各层材料含量和制备方法为例，对本发明进行进一步详细说明。
实施例一：
多观察角度防窥膜中的多观察角度功能层包括防窥结构和液晶胶体层，所述防窥结构为180°防窥结构。所述防窥结构的制备方法：将43%正性向列相液晶，向列相液晶及质量比是TEB30A：WTF-300：SLC1717：BHR40100=1:2:1:2；54%紫外聚合物，紫外聚合物及质量比是丙烯酸异冰片酯：甲基丙烯酸-2-羟乙酯：乙二醇二丙烯酸酯=2:2:1；紫外引发剂二苯甲酮2%，玻璃微珠 1%，匀制备得到圆台结构的防窥结构。所述圆台的横截面为梯形横截面，高度为80um、下底面宽度为15um、底角的角度为15°。所述液晶胶体层的制备方法：将60%向列相液晶、38%紫外聚合物、2%紫外引发剂，混合得到液晶胶体层，将所述液晶胶体层涂覆于所述圆台型的防窥结构，设置相邻两个圆台防窥结构间的距离为50um，化选用紫外光固化的方法，固化时间为5 min，制备得到多观察角度功能层。
多观察角度防窥膜制备方法：提供第一PET层，在所述第一PET层的表面制备第一导电层，在所述第一导电层的表面制备所述防窥结构，再将液晶胶体层均匀涂覆于所述防窥结构表面得多观察角度功能层，在所述多观察角度功能层的表面制备第二导电层，在所述第二导电层的表现制备第二PET层得到多观察角度防窥膜。
实施例二：
多观察角度防窥膜中的多观察角度功能层包括防窥结构和液晶胶体层，所述防窥结构为360°防窥结构。所述防窥结构的制备方法为：将40%正性向列相液晶，向列相液晶及质量比是TEB30A：WTF-300：SLC1717：BHR40100=1:1:1:1；57%热聚合物，热聚合物类型及质量比是双酚A型环氧树脂：双酚F型环氧树脂=3:1；热固化引发剂二乙烯三胺2%，玻璃微珠 1%，匀制备得到圆柱形结构的防窥结构。所述圆柱形的横截面为正方形横截面，正方形的边长为40um。所述液晶胶体层的制备方法为：将60%向列相液晶、38%热聚合物、2%热固化引发剂，混合得到液晶胶体层，将所述液晶胶体层涂覆于所述圆柱型的防窥结构，设置相邻两个圆柱防窥结构间的距离为90um，固化选用热固化的方法，固化温度为80℃，时间为3h，制备得到多观察角度功能层。
多观察角度防窥膜制备方法：提供第一PET层，在所述第一PET层的表面制备第一导电层，在所述第一导电层的表面制备所述防窥结构，再将液晶胶体层均匀涂覆于所述防窥结构表面得多观察角度功能层，在所述多观察角度功能层的表面制备第二导电层，在所述第二导电层的表现制备第二PET层得到多观察角度防窥膜。
将利用上述制备得到的多观察角度防窥膜进行测试，测试其防窥视角的角度。测试结果如下图5，当使用该多观察角度防窥膜时，窄视角时左右观察角度是60-80°、宽视角时左右观察角度是140-160°。两种视角下薄膜透过率均大于80%。
以上所述实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种多观察角度防窥膜，其特征在于，所述多观察角度防窥膜包括依次层叠设置的第一PET层，在所述第一PET层的任一面设置的第一导电层，在所述第一导电层背对着所述第一PET层的一面设置的多观察角度功能层，在所述广视角显示防窥层背对着所述第一导电层的一面设置的第二导电层，以及在所述第二导电层背对着所述多观察角度功能层的表面设置的第二PET层；其中，所述多观察角度功能层包括液晶胶体层以及设置在所述液晶胶体层之间的防窥结构，所述防窥结构为垂直于所述第一PET层方向的180°防窥结构和360°防窥结构的任一一种。
  2. 根据权利要求1所述的多观察角度防窥膜，其特征在于，所述多观察角度防窥膜的厚度为120-300um。
  3. 根据权利要求1所述的多观察角度防窥膜，其特征在于，所述多观察角度功能层的厚度为20-100um。
  4. 根据权利要求1所述的多观察角度防窥膜，其特征在于，所述180°防窥结构为黑色长方体结构或黑色圆台结构。
  5. 根据权利要求4所述的多观察角度防窥膜，其特征在于，所述长方体结构的长方形横截面的高度为20-100μm，宽度为5-20μm；相邻两个结构之间的间距为30-100μm；和/或，
    所述圆台结构的梯形横截面的高度为20-100μm，宽度为5-20μm，底角的角度为10°-30°；相邻两个结构之间的间距为30-100μm。
  6. 根据权利要求1所述的多观察角度防窥膜，其特征在于，所述360°防窥结构为黑色正方体和黑色圆柱体的至少一种。
  7. 根据权利要求6所述的多观察角度防窥膜，其特征在于，所述正方体结构正方形横截面的边长为20-100μm，相邻两个结构之间的距离为30-100μm；和/或，
    所述圆柱体结构正方形横截面的直径为20-100μm，相邻两个圆心之间的距离为40-200μm。
  8. 根据权利要求1-3任一所述的多观察角度防窥膜，其特征在于，以所述防窥结构原料的总质量为100%计，所述防窥结构原料包括如下重量份的组分：
    向列相液晶        30%-50%
    高分子聚合物     40%-60%
    引发剂            1%-3%
    玻璃微珠          0.5%-2%。
  9. 如权利要求1所述的多观察角度防窥膜，其特征在于，所述多观察角度防窥膜工作电压为5-50V、窄视角时左右观察角度是60-80°、宽视角时左右观察角度是140-160°。
  10. 一种多观察角度防窥膜的制备方法，包括如下步骤：
    提供第一PET层，在所述第一PET层的表面制备第一导电层，在所述第一导电层的表面制备所述防窥结构，再将液晶胶体层均匀涂覆于所述防窥结构表面得多观察角度功能层，在所述多观察角度功能层的表面制备第二导电层，在所述第二导电层的表现制备第二PET层得到多观察角度防窥膜；其中，所述多观察角度功能层为垂直于所述第一PET层的方向的180°防窥结构和360°防窥结构的任一一种。
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