WO2020140770A1 - 防窥膜及其制作方法、显示模组 - Google Patents

防窥膜及其制作方法、显示模组 Download PDF

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Publication number
WO2020140770A1
WO2020140770A1 PCT/CN2019/126967 CN2019126967W WO2020140770A1 WO 2020140770 A1 WO2020140770 A1 WO 2020140770A1 CN 2019126967 W CN2019126967 W CN 2019126967W WO 2020140770 A1 WO2020140770 A1 WO 2020140770A1
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WIPO (PCT)
Prior art keywords
privacy
prism
privacy film
prisms
film
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PCT/CN2019/126967
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English (en)
French (fr)
Inventor
朱贺玲
桑建
禹璐
程鹏飞
张功涛
孙海威
郝东佳
Original Assignee
京东方科技集团股份有限公司
北京京东方光电科技有限公司
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Application filed by 京东方科技集团股份有限公司, 北京京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US16/957,243 priority Critical patent/US11531227B2/en
Publication of WO2020140770A1 publication Critical patent/WO2020140770A1/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
    • G02F1/133509—Filters, e.g. light shielding masks
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present disclosure relates to the field of display technology, and in particular, to a peep-proof film, a manufacturing method thereof, and a display module.
  • the inventor of the present disclosure found that current display products mostly use a privacy film to protect the display content; but the conventional privacy film has the disadvantages of large thickness and low light transmittance. Although the purpose of protecting the display content is achieved, the product is reduced The display performance improves the display power consumption.
  • An aspect of an embodiment of the present disclosure provides a privacy film, including a plurality of transmission regions and a plurality of privacy regions, and the plurality of transmission regions and the plurality of privacy regions are in a direction perpendicular to the thickness of the privacy film Alternately arranged, wherein: at least one of the plurality of privacy areas has a setting structure that enables light incident on the at least one privacy area from the first side in the thickness direction of the privacy film Reflected back to the first side via the at least one privacy zone.
  • the setting structure includes a plurality of prisms, and the plurality of prisms are arranged along the thickness direction of the privacy film.
  • At least one prism in the plurality of prisms is a quadrangular prism or a pentagonal prism.
  • the refractive index of at least one of the plurality of transmission regions is smaller than the refractive index of the at least one prism.
  • At least one prism includes an incident surface, a first total reflection surface, a second total reflection surface, and an exit surface; wherein, the set light incident on the at least one prism from the first side can pass through the incident surface Transmission, total reflection of the first total reflection surface and the second total reflection surface, and transmission of the exit surface are reflected back to the first side, and the angle between the light and the horizontal direction is set to meet the preset angle range.
  • the first total reflection surface and the second total reflection surface are arranged in a mirror image with respect to a plane parallel to the thickness direction of the privacy film and perpendicular to the arrangement direction of the multiple privacy regions, and the incident surface and the exit surface are The plane parallel to the thickness direction of the privacy film and perpendicular to the arrangement direction of the plurality of privacy areas is provided as a mirror image.
  • the angle between the first total reflection surface and the second total reflection surface of the plurality of prisms decreases, and the incidence of the plurality of prisms The angle between the surface and the exit surface increases.
  • the pentagonal prism when at least one prism is a pentagonal prism, the pentagonal prism further includes a bottom surface.
  • the setting structure further includes a privacy layer, the privacy layer surrounds a plurality of prisms, and the refractive index of the privacy layer is less than the refractive index of at least one prism.
  • the refractive index of the privacy layer is equal to the refractive index of at least one transmission region.
  • the privacy film further includes an upper substrate and a lower substrate, and a plurality of transmission regions and a plurality of privacy regions are alternately arranged on the upper substrate and the lower substrate in a direction perpendicular to the thickness of the privacy film Wood.
  • a display module including a display panel, a backlight module, and a privacy film provided by an embodiment of the present disclosure; wherein the privacy film is disposed between the backlight module and the display panel.
  • the privacy film is provided on the light exit side of the display panel; and/or the privacy film is provided on the side of the display panel close to the backlight module.
  • a further aspect of an embodiment of the present disclosure provides a method for manufacturing a privacy film provided by an embodiment of the present disclosure, including: forming a plurality of spaced apart prism groups; wherein at least one of the plurality of prism groups includes edge protection A plurality of prisms arranged in the direction of the thickness of the peep film; and, an optical glue is dropped between two adjacent prism groups in the plurality of prism groups, and the optical glue is cured.
  • forming an optical layer of a set thickness and laser engraving the optical layer to form a plurality of prism groups; wherein at least one prism group includes a plurality of quadrangular prisms arranged in the direction of the thickness of the privacy film And/or pentaprism.
  • forming a plurality of spaced prism groups includes: forming an optical layer with a set thickness; and carving the optical layer with a knife to form a plurality of prism groups; wherein at least one prism group includes edge protection A plurality of quadrangular prisms and/or pentagonal prisms arranged in the direction of the thickness of the film.
  • forming a plurality of spaced-apart prism groups includes: for at least one prism group, using a 3D printing method, printing a plurality of quadrangular prisms arranged in the direction of the thickness of the privacy film layer by layer, and/or Five prisms.
  • injecting the optical glue between two adjacent prism groups and curing the optical glue includes: injecting a photo-curable glue between the two adjacent prism groups; and irradiating the photo-curing with ultraviolet light Glue; wherein, the refractive index of the photocurable glue is less than the refractive index of at least one prism group.
  • the privacy film provided by the embodiments of the present disclosure includes a plurality of transmission regions and a plurality of privacy regions, and the plurality of transmission regions and the plurality of privacy regions are alternately arranged in a direction perpendicular to the thickness of the privacy film, wherein: the multiple At least one of the privacy areas has a setting structure that allows light incident on the at least one privacy area from the first side in the thickness direction of the privacy film to be reflected by the at least one privacy area Back to the first side; therefore, the privacy film can increase the utilization rate of light energy of the film material, solving the problem of low transmittance of the privacy film in the related art.
  • FIG. 1 is a schematic diagram of a structure of a privacy filter in the related art.
  • FIG. 2 is another schematic structural diagram of a related-tech privacy film.
  • FIG. 3 is a schematic diagram of the light exit range of the related-tech privacy film.
  • FIG. 4 is a schematic longitudinal cross-sectional view of a privacy film provided by an embodiment of the present disclosure.
  • FIG. 5 is a schematic longitudinal cross-sectional view of a quadrangular prism in a privacy zone included in a privacy film provided by an embodiment of the present disclosure.
  • FIG. 6 is a schematic longitudinal cross-sectional view of a pentagonal prism in a privacy area included in a privacy film provided by an embodiment of the present disclosure.
  • FIG. 7 is a schematic longitudinal cross-sectional view of a transmission region included in a privacy film provided by an embodiment of the present disclosure.
  • FIG. 8 is a schematic diagram of the propagation path of light rays in the transmission area provided by an embodiment of the present disclosure.
  • FIG. 9 is a schematic diagram of the working principle of the quadrangular prism provided by the embodiment of the present disclosure.
  • FIG. 10 is a flowchart of a method for manufacturing a privacy film provided by an embodiment of the present disclosure.
  • 11a-11d are schematic flowcharts of manufacturing a privacy film by means of engraving provided by an embodiment of the present disclosure.
  • the related-tech anti-peep films are generally composed of the first base material 11 and the second base material 12 and between them.
  • the functional area is composed of several light-absorbing gratings 13 in the functional area, and the light-absorbing grating 13 divides the function into a plurality of light-transmitting areas 14. Therefore, as shown in the schematic diagram of the light exit range of the privacy film of the related art in FIG. 3, the light incident from any point in the light-transmitting area on the surface of the second substrate 12 is absorbed by the light absorption grating 13; The light that is not blocked by the light absorption grating 13 passes normally.
  • the anti-peep film of the related art adopts a narrow viewing angle (the viewing angle when the light intensity is 5% of the central light intensity) to realize the anti-peep function through light transmission and light cut off (absorbed) at a large viewing angle.
  • the viewing angle is generally about 30° ; But the loss of light energy is large, the brightness is reduced by about 50% or more.
  • the drive current of the display device usually needs to be increased to more than twice the original to increase the backlight to increase the brightness.
  • the inventors of the present disclosure have found that currently, light absorption gratings are used for anti-peeping.
  • the anti-peeping viewing angle is related to the thickness of the anti-peeping film. The greater the thickness, the better the anti-peeping effect.
  • the conventional thickness of the privacy filter is 320 micrometers ( ⁇ m). Therefore, the use of a privacy film greatly increases the thickness of the backlight and improves the luminous power, which is not conducive to energy saving and environmental protection.
  • the privacy film may include a plurality of transmission regions 15 and a number of privacy regions (as shown by reference numerals 20 and 20 in the figure). 30)), the transmission area 15 and the privacy area are alternately arranged in a direction perpendicular to the thickness of the privacy film; the privacy area is configured such that the incidence from the first side in the thickness direction of the privacy film into the privacy area The light can be reflected back to the structure on the first side through the privacy area.
  • the privacy film provided by the embodiments of the present disclosure includes several transmission regions and several privacy regions, the transmission regions and the privacy regions are alternately arranged in a direction perpendicular to the thickness of the privacy film, and the privacy regions are configured such that The light incident on the first side in the thickness direction of the privacy film can be reflected back to the structure of the first side through the privacy area; therefore, the privacy film provided by the embodiments of the present disclosure can increase the light energy of the film material The utilization rate solves the problem of low transmittance of the privacy film.
  • the privacy film may include an upper substrate 1 and a lower substrate 10, and the transmission area 15 and the privacy area are in a direction parallel to the substrate 1 and the lower substrate 10 It is alternately arranged between the upper substrate 1 and the lower substrate 10.
  • the materials of the upper substrate 1 and the lower substrate 10 may have anti-ball and/or anti-scratch properties, which may be polymethyl methacrylate (PMMA), also known as acrylic or plexiglass; it may also be Polyethylene terephthalate (Polyethylene Terephthalate, PET), of course, can also be other optical plastics.
  • PMMA polymethyl methacrylate
  • PET Polyethylene Terephthalate
  • the thicknesses of the upper substrate 1 and the lower substrate 10 may be equivalent to the thickness of the functional layer where the transmission region 15 is located; they may also be different according to application scenarios.
  • the privacy film applied on MNT Monitoring, display
  • its overall thickness can be more than 550 ⁇ m
  • the thickness of the functional layer where the transmission area 15 is located can be about 200 ⁇ m
  • the total thickness of the privacy film on mobile phones is 200 ⁇ m ⁇ 300 ⁇ m to meet the reliability requirements.
  • the structure of at least one privacy zone can meet the requirements of two aspects: first, the structure of the privacy zone is symmetrically arranged to ensure that light incident on the privacy zone from both left and right sides can be Reuse; second, to ensure that the large-angle light does not pass through the structure to exit the privacy film or the angle at which the privacy film meets the privacy requirements.
  • At least one privacy zone may include a plurality of prisms, the plurality of prisms are arranged along the thickness direction of the privacy film, that is, the plurality of prisms are directed to the upper substrate along the lower substrate 10 Arranged in the direction of 1.
  • the prism may be a quadrangular prism 30 and/or a pentagonal prism.
  • the anti-peep area can also be set to other structures that can reverse the direction of the large-angle light and reuse it.
  • the light reflected by the quadrangular prism 30 does not exit from the transmission area 15 and can re-enter the backlight module and pass through
  • the re-modulation of the microstructures of each layer of the backlight module and the bottom reflection sheet changes the original direction of propagation; when the light is emitted again, it can still be divided into two parts, one part is emitted from the transmission area 15 and the other part is returned to the backlight again Module, the propagation direction is re-modulated, thereby improving the utilization of light energy of the film.
  • At least one privacy zone may further include a privacy layer 20, which is disposed on the periphery of the prism, that is, the privacy layer 20 may wrap many of the privacy areas Each prism, and the refractive index of the privacy layer 20 is smaller than the refractive index of the prism.
  • the inner prism and the outer privacy layer 20 can form a high and low refractive index difference, which can satisfy the total reflection condition, so that the light entering the prism and the privacy layer 20 can be reused after two total reflections.
  • the refractive index of the privacy layer 20 may be equal to the refractive index of the transmission region 15.
  • the refractive index of the privacy layer 20 may not be equal to the refractive index of the transmission region 15.
  • FIG. 5 it is a schematic longitudinal cross-sectional view of a quadrangular prism 30 in the anti-peep area included in the anti-peep film provided by the embodiment of the present disclosure, that is, FIG. 5 shows The arrangement direction of the quadrangular prisms 30, that is, the direction in which the lower base material 10 points to the upper base material 1, the cross section of the quadrangular prism 30.
  • the quadrangular prism 30 may include an incident surface 40, a first total reflection surface 60, a second total reflection surface 65, and an exit surface 80; wherein, the first total reflection surface 60 and the second total reflection surface 65 may be relatively parallel to the privacy film
  • the plane of the thickness direction and perpendicular to the arrangement direction of the plurality of privacy areas is arranged in a mirror image, and the incident surface 40 and the exit surface 80 can be arranged parallel to the thickness direction of the privacy film and perpendicular to the arrangement of the plurality of privacy areas
  • the plane of the direction is set as a mirror image, so that the light incident from both sides of a privacy area can be effectively modulated.
  • the plurality of quadrangular prisms 30 have a first total reflection surface 60 and a second total reflection surface
  • the angle between 65 is reduced, and the angle between the incident surface 40 and the exit surface 80 is increased; that is, a plurality of quadrangular prisms 30 in a privacy area directed toward the upper substrate 1 along the lower substrate 10 ,
  • the angle between the first total reflection surface 60 and the second total reflection surface 65 becomes smaller and smaller, and the angle between the incident surface 40 and the exit surface 80 becomes larger and larger.
  • FIG. 6 it is a schematic longitudinal cross-sectional view of a pentaprism in the privacy area included in the privacy film provided by the embodiment of the present disclosure, that is, FIG. 6 shows The arrangement direction of the prisms, that is, the direction in which the lower base material 10 points to the upper base material 1, the cross section of the five prisms.
  • the pentagonal prism may include an incident surface 40, a first total reflection surface 60, a second total reflection surface 65, an exit surface 80, and a bottom surface 61; wherein, the first total reflection surface 60 and the second total reflection surface 65 may be relatively parallel to the anti-parallel
  • the plane of the thickness of the speculum film and the plane perpendicular to the arrangement direction of the plurality of privacy areas are mirror images, and the incident surface 40 and the exit surface 80 can be parallel to the thickness direction of the privacy film and perpendicular to the plurality of privacy areas
  • the plane of the direction of the arrangement is mirror image, so that the light incident from both sides of a privacy area can be effectively modulated; and the five-prism structure is more conducive to adjusting the angle between the incident surface of the prism and the incident light, which is Reflective conditions.
  • the direction of the incident surface and the exit surface can be adjusted by adjusting the size of the bottom surface 61 of the pentagonal prism, so that the incident light can meet the conditions of total reflection; therefore, for the thickness requirements or anti-peeping For a smaller angle, a five-prism structure can be used.
  • a plurality of pentagonal prisms are formed between the first total reflection surface 60 and the second total reflection surface 65
  • the angle is reduced, and the angle between the incident surface 40 and the exit surface 80 is increased; that is, a plurality of pentagonal prisms in a privacy area are directed along the lower substrate 10 toward the upper substrate 1, the first The angle between the total reflection surface 60 and the second total reflection surface 65 becomes smaller and smaller, and the angle between the entrance surface 40 and the exit surface 80 becomes larger and larger.
  • the angle between the incident surface and the exit surface of the first quadrangular prism closest to the upper substrate 1 is The angle between the incident surface and the exit surface of the second quadrangular prism second closest to the upper substrate 1 is
  • the angle between the incident surface and the exit surface of the nth prism furthest from the upper substrate 1 is From the first to the nth prism, the angle between the two total reflection surfaces gradually increases, and the angle between the incident surface and the exit surface slowing shrieking.
  • the height h of the privacy zone (the thickness of the functional layer where the transmission zone 15 is located) may range from 80 ⁇ m to 250 ⁇ m, and the width w1 of the transmission zone may range from 30 ⁇ m to 50 ⁇ m.
  • the width w2 may range from 15 ⁇ m to 30 ⁇ m.
  • the above-mentioned various sizes may also be adjusted according to different specific application scenarios.
  • FIG. 7 it is a schematic longitudinal cross-sectional view of a transmission area, where 85 is the upper surface of the lower substrate 10 covered by the transmission area, and 100 is the lower surface of the upper substrate 1 covered by the transmission area, 105 is the right side incident surface of the privacy area adjacent to the transmission area on the left, and 110 is the left incidence surface of the privacy area adjacent to the transmission area on the right side.
  • FIG. 8 it is a schematic diagram of a light propagation path in a transmission area provided by an embodiment of the present disclosure.
  • the width w1 of the transmission area is 44 ⁇ m
  • the height h of the privacy area is 88 ⁇ m
  • the refractive index of the transmission area is 1.4936
  • the refractive index of the quadrangular prism 30 is 1.5896.
  • the angle range of the angle between the light exiting from the transmission area and the vertical direction is -26.6° to +26.6°, from the farthest point A of the upper surface of the lower substrate 10 covered by the transmission area is incident on the right side with the transmission
  • the angle between the light of the first quadrangular prism and the horizontal direction of the anti-peep zone adjacent to the zone is 63.4°.
  • FIG. 9 it is a schematic diagram of the working principle of the quadrangular prism 30 provided by an embodiment of the present disclosure.
  • the angle between the incident light and the horizontal direction is greater than 63.4°, such as an increase of 2°, the first quadrangular prism can be guaranteed The angle of the total reflection surface still satisfies the total reflection condition; as the angle between the incident light and the horizontal direction gradually increases, when the total reflection condition of the first total reflection surface of the first quadrangular prism is exceeded, the incident light can enter the second Quadrangular prism.
  • the angle between the light rays emitted from the farthest point A of the upper surface of the lower substrate 10 covered by the transmission area and the first and second quadrangular prisms is 2.5°.
  • the brightness of the film layer of the privacy film is more than 1.5 times that of the conventional privacy film material.
  • the backlight has 200 rays of light
  • the transmittance of the conventional privacy filter is 50%
  • 100 rays of light pass through
  • 100 rays of light normally pass through
  • another 100 rays of light The total reflection back to the backlight module is reused; when it is reused, 50% of the light is still normally transmitted from the light-transmitting area, that is, 50 lights are normally transmitted, and the other 50 are re-modulated; after several modulations, the emitted
  • the total number of rays is: 100+50+25+12.5+.
  • It can be obtained by calculation that the film brightness of the privacy film provided by the embodiments of the present disclosure is more than 1.5 times that of the conventional privacy film material.
  • An embodiment of the present disclosure also provides a display module.
  • the display module may include a display panel, a backlight module, and the above-mentioned privacy film provided by the embodiment of the present disclosure; the privacy film may be disposed between the backlight module and the display panel between.
  • the privacy film provided by the embodiments of the present disclosure passes through the quadrangular prism 30 or pentagonal prism provided in the privacy protection area, and enters the backlight module again after the total reflection of the quadrilateral prism 30 or the pentagonal prism after two times of reflection It is re-used, which increases the utilization of light energy of the film layer, solves the technical problem of low transmittance of the privacy film, and can ensure the privacy of the displayed information in public places without losing the brightness of the backlight module Sex.
  • the privacy film provided by the embodiments of the present disclosure may be provided on the light exit side of the display panel; and/or on the side of the display panel close to the backlight module.
  • An embodiment of the present disclosure also provides a method for manufacturing the above-mentioned privacy film, as shown in FIG. 10, which is a flowchart of a method for manufacturing the privacy film provided by the embodiment of the present disclosure.
  • the manufacturing method of the privacy film may include steps S101 and S102.
  • step S101 a plurality of spaced prism groups are formed, and each prism group includes a plurality of prisms arranged in the thickness direction of the privacy film.
  • step S102 optical glue is dropped between adjacent prism groups, and the optical glue is cured.
  • dripping the optical glue between adjacent prism groups and curing the optical glue may include: injecting the photocurable glue between the prism groups and irradiating the photocurable glue with ultraviolet light; wherein, photocuring The refractive index of the glue is smaller than the refractive index of the prism group.
  • forming a plurality of spaced prism groups may include: forming an optical layer of a set thickness; engraving the optical layer to form the plurality of prism groups; wherein at least one prism group includes A plurality of quadrangular prisms 30 and/or pentagonal prisms arranged in the direction of the thickness of the privacy film.
  • FIGS. 11a to 11d it is a schematic flow chart of manufacturing an anti-peep film by engraving in accordance with an embodiment of the present disclosure.
  • the optical grade photocurable material n3 having the first refractive index is cured on the upper surface of the lower substrate 10; wherein, the thickness of the lower substrate 10 may be 50 ⁇ m to 125 ⁇ m, and the optical grade photocurable material
  • the thickness (height) of n3 may be 88 ⁇ m
  • the length l and width w (not shown in FIG. 11 a) may be 600 mm and 350 mm, respectively.
  • the area 111 represents an engraved area in which the optical grade photocurable material n3 is engraved and removed.
  • the optical grade photocurable material n3 and the structure formed by the lower substrate 10 are placed on the lifting table, and the telephoto laser is placed above the lifting table and faces the plane where the length and height of the optical grade photocurable material n3 are located ,
  • the engraving tool can also be moved horizontally (350mm) along the width direction of the optical grade photocurable material n3 to perform engraving of the four-prism 30/pentagonal tool until the engraving of 350mm width is completed To form the structure shown in Figure 11c.
  • the optical grade photocurable material n1 having the second refractive index is injected into the space between the engraved quadrangular prism 30/pentagonal prism, the optical grade photocurable material n3 and the optical grade
  • the photocurable material n1 may be a material with high light transmittance, ultraviolet light curable acrylic glue, etc., and the refractive index of the optical grade photocurable material n1 is less than the refractive index of the optical grade photocurable material n3;
  • the cured material n1 is subjected to ultraviolet curing.
  • the substrate 1 is pressed and subjected to ultraviolet curing treatment.
  • the horizontal right arrow in FIG. 11c indicates the moving direction of the lower substrate 10, and the curved arrow in the figure indicates the pressing direction of the upper substrate 1 when the upper substrate 1 is pressed.
  • the anti-peep film made by engraving can be applied to small display products such as mobile phones.
  • forming a plurality of spaced-apart prism groups may also include: for one prism group, using a 3D printing method, printing the four prisms 30 and/or the five prisms layer by layer.
  • a 3D printing method may be used to print the quadrilateral prism 30 and/or the pentagonal prism structure layer by layer on the lower substrate 10 using optical grade photocurable material n3; then, the optical grade photocurable material n1 is injected for printing
  • the space between the completed quadrangular prism 30 and/or pentagonal prism is subjected to ultraviolet curing treatment; finally, the base material 1 is pressed, and after curing, ultraviolet curing treatment is performed.
  • the privacy film made in this way can be applied to full-size products such as mobile phones and MNT.
  • the anti-peep film and the display module provided by the embodiments of the present disclosure have the following beneficial effects:
  • the anti-peep film provided by the embodiments of the present disclosure includes several transmission areas and several anti-peep areas, and the transmission areas And the privacy area are alternately arranged in a direction perpendicular to the thickness of the privacy film, and the privacy area is configured such that light incident on the privacy area from the first side in the thickness direction of the privacy film can be reflected back through the privacy area
  • the structure of the first side therefore, the privacy film provided by the embodiments of the present disclosure can increase the utilization rate of light energy of the film material, and solves the problem of low transmittance of the privacy film.
  • the privacy film provided by the embodiments of the present disclosure passes through the quadrangular prism or pentagonal prism provided in the privacy protection area, and enters the backlight mode again after passing through the total reflection of the quadrangular prism or the pentagonal prism twice.
  • the group is reused, which increases the utilization of light energy of the film layer, solves the technical problem of low transmittance of the privacy film, and can ensure that the display information is protected in public places without losing the brightness of the backlight module. Privacy.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

本公开提供了一种防窥膜及其制作方法、显示模组。防窥膜包括多个透射区和多个防窥区，且多个透射区和多个防窥区在垂直于防窥膜的厚度的方向上交替设置，其中：该多个防窥区中的至少一个防窥区具有设定结构，设定结构使得从防窥膜的厚度方向的第一侧入射到该至少一个防窥区的光线能够经该至少一个防窥区反射回该第一侧；因此，该防窥膜能够增加膜材对光能的利用率，解决了相关技术的防窥膜的透光率低的问题。

Description

防窥膜及其制作方法、显示模组 技术领域
本公开涉及显示技术领域，尤其涉及一种防窥膜及其制作方法、显示模组。
背景技术
随着手机、笔记本等显示产品的普及，对在多种应用场合的显示内容的保护也成为至关重要的问题。如在公共交通车或飞机上查收邮件、翻阅资料等涉及商业信息的操作，需要对显示内容进行有效保护，防止周围人群对显示信息的窥视。因此，开发带有防窥功能的显示产品显得尤为重要。
本公开的发明人发现，目前的显示产品，多采用防窥膜保护显示内容；但常规防窥膜具有厚度大、透光率低的缺点，虽然达到了保护显示内容的目的，但降低了产品的显示性能，提高了显示的功耗。
发明内容
本公开实施例的一个方面提供一种防窥膜，包括多个透射区和多个防窥区，且该多个透射区和该多个防窥区在垂直于防窥膜的厚度的方向上交替设置，其中：该多个防窥区中的至少一个防窥区具有设定结构，该设定结构使得从防窥膜的厚度方向的第一侧入射到该至少一个防窥区的光线能够经该至少一个防窥区反射回该第一侧。
在可能的实施方式中，设定结构包括多个棱柱，且该多个棱柱沿防窥膜的厚度方向排列。
在可能的实施方式中，多个棱柱中的至少一个棱柱为四棱柱或五棱柱。
在可能的实施方式中，多个透射区中的至少一个透射区的折射率小于该至少一个棱柱的折射率。
在可能的实施方式中，至少一个棱柱包括入射面、第一全反射面、第二全反射面和出射面；其中，从第一侧入射到该至少一个棱柱的设定光线，能够通过入射面透射、第一全反射面和第二全反射面全反射，以及出射面透射，被反射回该第一侧，设定光线与水平方向的夹角满足预设角度范围。
在可能的实施方式中，第一全反射面和第二全反射面相对于平行于防窥膜的厚度方向且垂直于多个防窥区的排列方向的平面呈镜像设置，以及入射面和出射面相对于平行于防窥膜的厚度方向且垂直于多个防窥区的排列方向的平面呈镜像设置。
在可能的实施方式中，沿防窥膜的厚度且远离第一侧的方向，多个棱柱的第一全反射面和第二全反射面之间的夹角递减，且该多个棱柱的入射面和出射面之间的夹角递增。
在可能的实施方式中，至少一个棱柱为五棱柱时，五棱柱还包括底面。
在可能的实施方式中，设定结构还包括防窥层，防窥层包裹多个棱柱，且防窥层的折射率小于至少一个棱柱的折射率。
在可能的实施方式中，防窥层的折射率等于至少一个透射区的折射率。
在可能的实施方式中，防窥膜还包括上基材和下基材，多个透射区和多个防窥区在垂直于防窥膜的厚度的方向上交替设置在上基材和下基材之间。
本公开实施例的另一方面提供一种显示模组，包括显示面板、背光模组和本公开实施例提供的防窥膜；其中，防窥膜设置在背光模组和显示面板之间。
在可能的实施方式中，防窥膜设置在显示面板的出光侧；和/或，防窥膜设置在显示面板靠近背光模组的一侧。
本公开实施例的又一方面提供一种本公开实施例提供的防窥膜的制作 方法，包括：形成间隔开的多个棱柱组；其中，多个棱柱组中的至少一个棱柱组包括沿防窥膜的厚度的方向排列的多个棱柱；以及，在多个棱柱组中的相邻两个棱柱组之间滴注光学胶，并固化光学胶。
在可能的实施方式中，形成设定厚度的光学层；以及对光学层进行激光雕刻，形成多个棱柱组；其中，至少一个棱柱组包括沿防窥膜的厚度的方向排列的多个四棱柱和/或五棱柱。
在可能的实施方式中，形成间隔开的多个棱柱组，包括：形成设定厚度的光学层；以及对光学层进行刀具雕刻，形成多个棱柱组；其中，至少一个棱柱组包括沿防窥膜的厚度的方向排列的多个四棱柱和/或五棱柱。
在可能的实施方式中，形成间隔开的多个棱柱组，包括：对于至少一个棱柱组，采用3D打印的方式，逐层打印沿防窥膜的厚度的方向排列的多个四棱柱和/或五棱柱。
在可能的实施方式中，在相邻的两个棱柱组之间滴注光学胶，并固化光学胶，包括：将光固化胶注入相邻的两个棱柱组之间；以及用紫外光照射光固化胶；其中，光固化胶的折射率小于至少一个棱柱组的折射率。
本公开实施例提供的防窥膜包括多个透射区和多个防窥区，且多个透射区和多个防窥区在垂直于防窥膜的厚度的方向上交替设置，其中：该多个防窥区中的至少一个防窥区具有设定结构，设定结构使得从防窥膜的厚度方向的第一侧入射到该至少一个防窥区的光线能够经该至少一个防窥区反射回该第一侧；因此，该防窥膜能够增加膜材对光能的利用率，解决了相关技术中防窥膜透光率低的问题。
本公开附加的方面和优点将在下面的描述中部分给出，这些将从下面的描述中变得明显，或通过本公开的实践了解到。
附图说明
图1是相关技术的防窥膜的一种结构示意图。
图2是相关技术的防窥膜的另一结构示意图。
图3是相关技术的防窥膜的光线出射范围的示意图。
图4是本公开实施例提供的防窥膜的一种纵截面示意图。
图5是本公开实施例提供的防窥膜包括的防窥区中的一个四棱柱的一种纵截面示意图。
图6是本公开实施例提供的防窥膜包括的防窥区中的一个五棱柱的一种纵截面示意图。
图7是本公开实施例提供的防窥膜包括的透射区的一种纵截面示意图。
图8是本公开实施例提供的光线在透射区中的传播路径的示意图。
图9是本公开实施例提供的四棱柱的工作原理示意图。
图10是本公开实施例提供的防窥膜的制作方法的一种流程图。
图11a-图11d是本公开实施例提供的采用雕刻的方式制作防窥膜的一种流程示意图。
附图标记说明：11-第一基材；12-第二基材；13-吸光光栅；14-透光区；1-上基材；10-下基材；15-透射区；20-防窥层；30-四棱柱；40-入射面；80-出射面；60-第一全反射面；65-第二全反射面；61-底面；85-透射区覆盖的下基材的上表面；100-透射区覆盖的上基材的下表面；105-在左侧与透射区相邻的防窥区的右侧入射面；110-在右侧与透射区相邻的防窥区的左侧入射面；111-被雕刻区域。
具体实施方式
下面详细描述本公开的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功 能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本公开，而不能解释为对本公开的限制。
本技术领域技术人员可以理解，除非特意声明，这里使用的单数形式“一”、“一个”、“所述”和“该”也可包括复数形式。应该进一步理解的是，本公开的说明书中使用的措辞“包括”是指存在所述特征、整数、步骤、操作、元件和/或组件，但是并不排除存在或添加一个或多个其他特征、整数、步骤、操作、元件、组件和/或它们的组。应该理解，当我们称元件被“连接”到另一元件时，它可以直接连接到其他元件，或者也可以存在中间元件。此外，这里使用的“连接”可以包括无线连接。这里使用的措辞“和/或”包括一个或更多个相关联的列出项的全部或任一单元和全部组合。
本技术领域技术人员可以理解，除非另外定义，这里使用的所有术语(包括技术术语和科学术语)，具有与本公开所属领域中的普通技术人员的一般理解相同的意义。还应该理解的是，诸如通用字典中定义的那些术语，应该被理解为具有与相关技术的上下文中的意义一致的意义，并且除非像这里一样被特定定义，否则不会用理想化或过于正式的含义来解释。
本公开的发明人发现，如图1和图2两种相关技术的防窥膜的结构示意图所示，相关技术的防窥膜一般由第一基材11、第二基材12和它们之间的功能区构成；功能区中有若干个吸光光栅13，吸光光栅13把功能区分成多个透光区14。从而，如图3相关技术的防窥膜的光线出射范围的示意图所示，由第二基材12表面透光区的任一点入射的光线，若经过吸光光栅13的遮挡，则光线被吸收；未经过吸光光栅13遮挡的光线则正常透过。
相关技术的防窥膜采用窄视角(光强衰减为中心光强5％时的视角)光线透射、大视角光线截止(被吸收)的方式实现防窥功能，可视角一 般为正负30°左右；但光能损失较大，亮度约降低50％甚至更多。对于对亮度要求较高的液晶显示器件，使用此种防窥膜时，为保证亮度不变，显示器件的驱动电流通常需要提升至原来的2倍以上来增加背光进而增加亮度。
本公开的发明人发现，目前采用吸光光栅的方式进行防窥，防窥视角与防窥膜的厚度相关，厚度越大，防窥效果越好。相关技术的防窥膜常规厚度为320微米(μm)。因此，采用防窥膜大大增加了背光源的厚度，提高了发光功率，不利于节能环保。
为了解决上述问题，本公开实施例提供了一种新的防窥膜。下面结合附图介绍本公开实施例的具体技术方案。
如图4所示，其为本公开实施例提供的防窥膜的一种纵截面示意图，该防窥膜可包括若干个透射区15和若干个防窥区(如图中附图标记20和30所示的区域)，透射区15和防窥区在垂直于防窥膜厚度的方向上交替设置；防窥区被构造成使得从防窥膜的厚度方向的第一侧入射到防窥区的光线能够经防窥区反射回该第一侧的结构。
由于本公开实施例提供的防窥膜包括若干个透射区和若干个防窥区，透射区和防窥区在垂直于防窥膜厚度的方向上交替设置，且防窥区被构造成使得从防窥膜的厚度方向的第一侧入射到防窥区的光线能够经防窥区反射回该第一侧的结构；因此，本公开实施例提供的防窥膜能够增加膜材对光能的利用率，解决了防窥膜透光率低的问题。
根据本公开提供的实施例，如图4所示，防窥膜可包括上基材1和下基材10，透射区15和防窥区在平行于基材1和下基材10的方向上交替设置在上基材1和下基材10之间。上基材1和下基材10的材料可具有抗落球和/或抗划伤的性能，具体可以为聚甲基丙烯酸甲酯(PolymethylMethacrylate，PMMA)，又称为亚克力或有机玻璃；也可以为聚对苯二甲酸类塑料(Polyethylene Terephthalate，PET)，当然还可以 为其它光学塑料。上基材1和下基材10的厚度与透射区15所在的功能层的厚度可相当；也可根据应用场景有所差异。如应用在MNT(Monitor，显示器)上的防窥膜，为保障膜材的信赖性及抗褶皱性能，其总体厚度可在550μm以上，透射区15所在的功能层的厚度可约为200μm；应用于手机(mobile)上的防窥膜，总厚度为200μm～300μm即可满足信赖性要求。
根据本公开提供的实施例，至少一个防窥区的结构可满足两方面的要求：第一、防窥区的结构对称设置，保证从左右两侧入射到该防窥区上的光线均可以被重新利用；第二、保证大角度光线不经过该结构射出防窥膜或射出防窥膜的角度满足防窥要求。
根据本公开提供的实施例，如图4所示，至少一个防窥区可包括多个棱柱，多个棱柱沿防窥膜的厚度方向排列，即多个棱柱沿下基材10指向上基材1的方向排列。在一种可实施方式中，棱柱可为四棱柱30和/或五棱柱。当然，在实际设计时，防窥区还可以设置为其它可将大角度光线折转方向并重新利用的结构。
当本公开实施例提供的防窥膜应用在背光模组时，如图4所示，被四棱柱30反射后的光线，没有从透射区15射出的部分，可以重新进入背光模组，并经过背光模组各层膜材微结构和底部反射片的重新调制，改变原来的传播方向；当该光线再次射出时，可仍被分成两部分，一部分从透射区15射出，另一部分又重新返回背光模组，传播方向被重新调制，从而提高了膜材对光能的利用率。
根据本公开提供的实施例，如图4所示，至少一个防窥区还可包括防窥层20，防窥层20设置在棱柱的周边，即防窥层20可包裹防窥区中的多个棱柱，且防窥层20的折射率小于棱柱的折射率。内部的棱柱和外部的防窥层20可形成高、低折射率差异，从而可以满足全反射条件，让进入棱柱和防窥层20的光线可以经过两次全反射后被重新利用。在一种 可实施方式中，防窥层20的折射率可等于透射区15的折射率。当然，防窥层20的折射率也可以与透射区15的折射率不相等。
根据本公开提供的实施例，如图5所示，其为本公开实施例提供的防窥膜包括的防窥区中的一个四棱柱30的一种纵截面示意图，即图5示出了沿四棱柱30的排列方向，即沿下基材10指向上基材1的方向，四棱柱30的截面。四棱柱30可包括入射面40、第一全反射面60、第二全反射面65和出射面80；其中，第一全反射面60和第二全反射面65可相对于平行于防窥膜的厚度方向且垂直于该多个防窥区的排列方向的平面呈镜像设置，入射面40和出射面80可相对于平行于防窥膜的厚度方向且垂直于该多个防窥区的排列方向的平面呈镜像设置，从而能够使得从一个防窥区的两侧入射的光线均可被有效调制。
根据本公开提供的实施例，如图4和图5所示，沿防窥膜的厚度且远离下基材10的方向，多个四棱柱30以第一全反射面60和第二全反射面65之间的夹角减小、入射面40和出射面80之间的夹角增加的方式排列；即在一个防窥区中的多个四棱柱30，沿下基材10指向上基材1的方向，第一全反射面60和第二全反射面65之间的夹角越来越小，入射面40和出射面80之间的夹角越来越大。
根据本公开提供的实施例，如图6所示，其为本公开实施例提供的防窥膜包括的防窥区中的一个五棱柱的一种纵截面示意图，即图6示出了沿五棱柱的排列方向，即沿下基材10指向上基材1的方向，五棱柱的截面。五棱柱可包括入射面40、第一全反射面60、第二全反射面65、出射面80和底面61；其中，第一全反射面60和第二全反射面65可相对于平行于防窥膜的厚度方向且垂直于该多个防窥区的排列方向的平面呈镜像设置，入射面40和出射面80可相对于平行于防窥膜的厚度方向且垂直于该多个防窥区的排列方向的平面呈镜像设置，从而能够使得从一个防窥区的两侧入射的光线均可被有效调制；且五棱柱结构更有利于 调整棱柱的入射面与入射光线的角度，便于实现全反射条件。
根据本公开提供的实施例，可通过调整五棱柱底面61的尺寸，来调整入射面和出射面的方向，从而可以使入射光线满足全反射的条件；因此，对于厚度要求较高的或者防窥角度更小的需求，可以采用五棱柱结构。
根据本公开提供的实施例，如图6所示，沿防窥膜的厚度且远离下基材10的方向，多个五棱柱以第一全反射面60和第二全反射面65之间的夹角减小、入射面40和出射面80之间的夹角增加的方式排列；即在一个防窥区中的多个五棱柱，沿下基材10指向上基材1的方向，第一全反射面60和第二全反射面65之间的夹角越来越小，入射面40和出射面80之间的夹角越来越大。
以下通过具体实例，阐述本公开实施例提供的防窥膜的工作原理。
如图4所示，距离上基材1最近的第一四棱柱的入射面和出射面之间的夹角为
Figure PCTCN2019126967-appb-000001
距离上基材1第二近的第二四棱柱的入射面和出射面之间的夹角为
Figure PCTCN2019126967-appb-000002
以此类推，距离上基材1最远的第n个四棱柱的入射面和出射面之间的夹角为
Figure PCTCN2019126967-appb-000003
第一四棱柱至第n四棱柱，两个全反射面的夹角逐渐增加，入射面和出射面的夹角
Figure PCTCN2019126967-appb-000004
逐渐减小。
根据本公开提供的实施例，防窥区的高度h(透射区15所在的功能层的厚度)的范围可为80μm～250μm，透射区的宽度w1的范围可为30μm～50μm，防窥区的宽度w2的范围可为15μm～30μm。根据本公开提供的实施例，还可根据具体应用场景的不同而调节上述各个尺寸。
如图7所示，其为一个透射区的一种纵截面示意图，其中，85为该透射区覆盖的下基材10的上表面，100为该透射区覆盖的上基材1的下表面，105为在左侧与该透射区相邻的防窥区的右侧入射面，110为在右侧与该透射区相邻的防窥区的左侧入射面。
如图8所示，其为本公开实施例提供的光线在透射区中的传播路径 的示意图。例如，透射区的宽度w1为44μm，防窥区的高度h为88μm，透射区的折射率为1.4936，四棱柱30折射率为1.5896。从透射区出射的光线与竖直方向的夹角的角度范围为-26.6°～+26.6°，从透射区覆盖的下基材10的上表面的最远点A入射至在右侧与该透射区相邻的防窥区的第一四棱柱的光线与水平方向的夹角为63.4°。四棱柱30的全反射角
Figure PCTCN2019126967-appb-000005
满足
Figure PCTCN2019126967-appb-000006
即
Figure PCTCN2019126967-appb-000007
因此，当第一四棱柱的第一全反射面与水平面的夹角大于等于63.4°-(90°-70°)＝43.4°时，满足全反射条件。
如图9所示，其为本公开实施例提供的四棱柱30的工作原理示意图，当入射光线与水平方向的夹角大于63.4°时，如增加2°，可保证第一四棱柱的第一全反射面的角度依然满足全反射条件；随着入射光线与水平方向的夹角逐渐增加，当超出第一四棱柱的第一全反射面的全反射条件时，则入射光线可入射至第二四棱柱。根据全反射条件，从透射区覆盖的下基材10的上表面的最远点A发出的光线，到达第一与第二四棱柱的光线之间的夹角为2.5°。
根据本公开实施例提供的防窥膜，该防窥膜的膜层亮度为常规防窥膜材的膜层亮度的1.5倍以上。例如，假设背光有200条光线，常规防窥膜的透光率为50％，则有100根光线通过；根据本公开实施例提供的防窥膜，100根光线正常透过，另外100根光线全反射回背光模组被重新利用；再次利用时，仍有50％的光线从透光区正常透过，即50根光线正常透过，另外50根被重新调制；经过若干次调制，出射的总光线数为：100+50+25+12.5+……。通过计算可得，本公开实施例提供的防窥膜的膜层亮度为常规防窥膜材的膜层亮度的1.5倍以上。
本公开实施例还提供一种显示模组，该显示模组可包括显示面板、背光模组和本公开实施例提供的上述防窥膜；该防窥膜可设置在背光模组和显示面板之间。
本公开实施例提供的防窥膜通过防窥区设置的四棱柱30或五棱柱，将入射至防窥区的光线，经过四棱柱30或五棱柱的两次全反射后，再次进入背光模组被重新利用，增加了膜层对光能的利用率，解决了防窥膜透光率低的技术问题，可以保证在不损失背光模组的亮度的前提下，在公共场所保护显示信息的私密性。
根据本公开提供的实施例，本公开实施例提供的防窥膜可设置在显示面板的出光侧；和/或，设置在显示面板靠近背光模组的一侧。
本公开实施例还提供一种上述防窥膜的制作方法，如图10所示，其为本公开实施例提供的防窥膜的制作方法的一种流程图。该防窥膜的制作方法可包括：步骤S101和步骤S102。
在步骤S101中，形成间隔开的多个棱柱组，每个棱柱组包括沿防窥膜的厚度方向排列的若干个棱柱。
在步骤S102中，在相邻的棱柱组之间滴注光学胶，并固化光学胶。
根据本公开提供的实施例，在相邻的棱柱组之间滴注光学胶，并固化光学胶，可包括：将光固化胶注入棱柱组之间，并用紫外光照射光固化胶；其中，光固化胶的折射率小于棱柱组的折射率。
根据本公开提供的实施例，形成间隔开的多个棱柱组，可包括：形成设定厚度的光学层；并对光学层进行雕刻，形成该多个棱柱组；其中，至少一个棱柱组包括沿防窥膜的厚度的方向排列的多个四棱柱30和/或五棱柱。
根据本公开提供的实施例，如图11a-图11d所示，其为本公开实施例提供的采用雕刻的方式制作防窥膜的一种流程示意图。如图11a所示，将具有第一种折射率的光学级可光固化材料n3固化在下基材10的上表面；其中，下基材10的厚度可为50μm～125μm，光学级可光固化材料n3的厚度(高h)可为88μm，长l和宽w(图11a中未示出)可分别为600mm和350mm。在图11a中，区域111表示被雕刻区域，该区域中 的光学级可光固化材料n3被雕刻去除掉。
接着，将光学级可光固化材料n3和下基材10成型后的结构放置于升降台上，长焦激光器置于升降台上方并面对光学级可光固化材料n3的长和高所在的平面，沿光学级可光固化材料n3的宽度方向(350mm)进行四棱柱30/五棱柱激光雕刻，每雕刻5mm至10mm，升降台上升相应的距离使得光学级可光固化材料n3与长焦激光器靠近相应的距离，直至350mm宽度雕刻完成，形成的结构如图11c所示。
根据本公开提供的实施例，如图11b所示，也可沿光学级可光固化材料n3的宽度方向水平移动(350mm)雕刻刀具，进行四棱柱30/五棱柱刀具雕刻，直至350mm宽度雕刻完成，形成如图11c所示的结构。
接着，如图11d所示，将具有第二种折射率的光学级可光固化材料n1注入雕刻完成的四棱柱30/五棱柱之间的间隔区，光学级可光固化材料n3和光学级可光固化材料n1可为具有高透光率、紫外光可固化的亚克力胶水等材料，且光学级可光固化材料n1的折射率小于光学级可光固化材料n3的折射率；对光学级可光固化材料n1进行紫外光固化处理。
最后，如图11d所示，压合上基材1，并进行紫外光固化处理。图11c中水平向右的箭头表示下基材10的移动方向，图中弯曲的箭头表示压合上基材1时，上基材1的压合方向。
采用雕刻方式制作的防窥膜，可适用于手机等小显示屏产品。
根据本公开提供的实施例，形成间隔开的多个棱柱组，也可包括：对于一个棱柱组，采用3D打印的方式，逐层打印四棱柱30和/或五棱柱。
具体地，可采用3D打印的方式，使用光学级可光固化材料n3，将四棱柱30和/或五棱柱结构逐层打印在下基材10上；接着，将光学级可光固化材料n1注入打印完成的四棱柱30和/或五棱柱之间的间隔区，并进行紫外光固化处理；最后，压合上基材1，并在压合后进行紫外光固化处理。
采用这种方式制作的防窥膜，可适用于手机、MNT等全尺寸产品。
综上所述，本公开实施例提供的防窥膜和显示模组，具有如下有益效果：第一、本公开实施例提供的防窥膜包括若干个透射区和若干个防窥区，透射区和防窥区在垂直于防窥膜厚度的方向上交替设置，且防窥区被构造成使得从防窥膜的厚度方向的第一侧入射到防窥区的光线能够经防窥区反射回该第一侧的结构；因此，本公开实施例提供的防窥膜能够增加膜材对光能的利用率，解决了防窥膜透光率低的问题。第二、本公开实施例提供的防窥膜通过防窥区设置的四棱柱或五棱柱，将入射至防窥区的光线，经过四棱柱或五棱柱的两次全反射后，再次进入背光模组被重新利用，增加了膜层对光能的利用率，解决了防窥膜透光率低的技术问题，可以保证在不损失背光模组的亮度的前提下，在公共场所保护显示信息的私密性。
以上所述仅是本公开的部分实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本公开原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本公开的保护范围。

Claims (18)

  1. 一种防窥膜，包括多个透射区和多个防窥区，且所述多个透射区和所述多个防窥区在垂直于所述防窥膜的厚度的方向上交替设置，其中：
    所述多个防窥区中的至少一个防窥区具有设定结构，所述设定结构使得从所述防窥膜的厚度方向的第一侧入射到所述至少一个防窥区的光线能够经所述至少一个防窥区反射回所述第一侧。
  2. 根据权利要求1所述的防窥膜，其中，所述设定结构包括多个棱柱，且所述多个棱柱沿所述防窥膜的厚度方向排列。
  3. 根据权利要求2所述的防窥膜，其中，所述多个棱柱中的至少一个棱柱为四棱柱或五棱柱。
  4. 根据权利要求3所述的防窥膜，其中，所述多个透射区中的至少一个透射区的折射率小于所述至少一个棱柱的折射率。
  5. 根据权利要求4所述的防窥膜，其中，所述至少一个棱柱包括入射面、第一全反射面、第二全反射面和出射面；
    其中，从所述第一侧入射到所述至少一个棱柱的设定光线，能够通过所述入射面透射、所述第一全反射面和所述第二全反射面全反射，以及所述出射面透射，被反射回所述第一侧，所述设定光线与水平方向的夹角满足预设角度范围。
  6. 根据权利要求5所述的防窥膜，其中，所述第一全反射面和所述第二全反射面相对于平行于所述防窥膜的厚度方向且垂直于所述多个防窥区的排列方向的平面呈镜像设置，以及所述入射面和所述出射面相对 于平行于所述防窥膜的厚度方向且垂直于所述多个防窥区的排列方向的所述平面呈镜像设置。
  7. 根据权利要求5-6任一项所述的防窥膜，其中，沿所述防窥膜的厚度且远离所述第一侧的方向，所述多个棱柱的第一全反射面和第二全反射面之间的夹角递减，且所述多个棱柱的入射面和出射面之间的夹角递增。
  8. 根据权利要求3-7任一项所述的防窥膜，其中，所述至少一个棱柱为五棱柱时，所述五棱柱还包括底面。
  9. 根据权利要求4-8任一项所述的防窥膜，其中，所述设定结构还包括防窥层，所述防窥层包裹所述多个棱柱，且所述防窥层的折射率小于所述至少一个棱柱的折射率。
  10. 根据权利要求9所述的防窥膜，其中，所述防窥层的折射率等于所述至少一个透射区的折射率。
  11. 根据权利要求1-10任一项所述的防窥膜，还包括上基材和下基材，所述多个透射区和所述多个防窥区在垂直于所述防窥膜的厚度的方向上交替设置在所述上基材和所述下基材之间。
  12. 一种显示模组，包括显示面板、背光模组和权利要求1-11任一项所述的防窥膜；其中，所述防窥膜设置在所述背光模组和所述显示面板之间。
  13. 根据权利要求12所述的显示模组，其中，所述防窥膜设置在所述显示面板的出光侧；和/或，所述防窥膜设置在所述显示面板靠近所述背光模组的一侧。
  14. 一种根据权利要求1-11任一项所述的防窥膜的制作方法，包括：
    形成间隔开的多个棱柱组；其中，所述多个棱柱组中的至少一个棱柱组包括沿所述防窥膜的厚度的方向排列的多个棱柱；以及
    在所述多个棱柱组中的相邻两个棱柱组之间滴注光学胶，并固化所述光学胶。
  15. 根据权利要求14所述的制作方法，其中，形成间隔开的所述多个棱柱组，包括：
    形成设定厚度的光学层；以及
    对所述光学层进行激光雕刻，形成所述多个棱柱组；其中，所述至少一个棱柱组包括沿所述防窥膜的厚度的方向排列的多个四棱柱和/或五棱柱。
  16. 根据权利要求14所述的制作方法，其中，形成间隔开的所述多个棱柱组，包括：
    形成设定厚度的光学层；以及
    对所述光学层进行刀具雕刻，形成所述多个棱柱组；其中，所述至少一个棱柱组包括沿所述防窥膜的厚度的方向排列的多个四棱柱和/或五棱柱。
  17. 根据权利要求14所述的制作方法，其中，形成间隔开的所述多个棱柱组，包括：
    对于所述至少一个棱柱组，采用3D打印的方式，逐层打印沿所述防窥膜的厚度的方向排列的多个四棱柱和/或五棱柱。
  18. 根据权利要求14-17任一项所述的制作方法，其中，在所述相邻两个棱柱组之间滴注所述光学胶，并固化所述光学胶，包括：
    将光固化胶注入所述相邻两个棱柱组之间；以及
    用紫外光照射所述光固化胶；
    其中，所述光固化胶的折射率小于所述至少一个棱柱组的折射率。
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CN109445173B (zh) 2019-01-02 2021-01-22 京东方科技集团股份有限公司 一种防窥膜及其制作方法、显示模组
CN111458923B (zh) * 2020-05-14 2023-06-02 京东方科技集团股份有限公司 防窥膜及显示装置
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