CN116661037A - Peep-proof film and preparation method thereof - Google Patents
Peep-proof film and preparation method thereof Download PDFInfo
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- CN116661037A CN116661037A CN202211731733.3A CN202211731733A CN116661037A CN 116661037 A CN116661037 A CN 116661037A CN 202211731733 A CN202211731733 A CN 202211731733A CN 116661037 A CN116661037 A CN 116661037A
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1814—Diffraction gratings structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings
- G02B5/1819—Plural gratings positioned on the same surface, e.g. array of gratings
- G02B5/1823—Plural gratings positioned on the same surface, e.g. array of gratings in an overlapping or superposed manner
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- 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
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1866—Transmission gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B2005/1804—Transmission gratings
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The embodiment of the application relates to the field of peep-proof films and provides a peep-proof film and a preparation method thereof, wherein the peep-proof film comprises a substrate layer, a first peep-proof layer, a bonding layer and a second peep-proof layer which are sequentially arranged on one side of the substrate layer, each peep-proof layer comprises a plurality of first transmission parts and a plurality of shading parts, one shading part is formed between every two adjacent first transmission parts, each shading part comprises two shading layers which are oppositely arranged, a hollow part is arranged between the two shading layers, and a second transmission part is formed in the hollow part, so that the first transmission part and the second transmission part can transmit light, the light transmittance is effectively improved, and shading materials are saved; the two peep-proof layers are connected through the adhesive layer, the adhesive layer can transmit light, and the light transmission effect is not affected; in addition, under the condition that the thickness of the peep-proof film is unchanged, the bonding layer is filled between the two peep-proof layers, so that the filling amount of the shading material can be further reduced, and the light transmittance is further improved.
Description
Technical Field
The application relates to the field of peep-proof films, in particular to a peep-proof film and a preparation method of the peep-proof film.
Background
Along with the popularization of electronic equipment, the peep-proof film is widely applied to a display screen of the electronic equipment, so that information displayed on the display screen can be protected. Specifically, the peep-proof film is attached to the display screen, so that the watching requirement can be met when the user looks ahead, and the screen information cannot be seen clearly after the user deviates from a certain angle, and the personal privacy of the user in the public space can be better protected.
The peep-proof film is usually realized through a grating structure which is arranged in parallel, and light is blocked by the grating at a certain angle, so that the wide viewing angle of the display screen is changed to a narrow visual angle, and the side surface is not visible with screen information. In the existing peep-proof film, the transmission structures and the shading structures are distributed in a staggered mode, the shading structures are solid structures, front-view light cannot penetrate through the shading structures, and the volumes of the shading structures and the transmission structures are large, so that the light transmittance of the peep-proof film is affected. The transmittance of the peep-proof film with the structure at present is only 60-70%, and the actual experience effect is poor.
Based on this, it is necessary to provide a novel privacy film capable of effectively improving light transmittance.
Disclosure of Invention
The embodiment of the application provides a peep-proof film and a preparation method of the peep-proof film, which can effectively improve light transmittance.
In a first aspect, there is provided a privacy film comprising: the anti-peeping device comprises a substrate layer, a first anti-peeping layer, a bonding layer and a second anti-peeping layer, wherein the first anti-peeping layer, the bonding layer and the second anti-peeping layer are sequentially arranged on one side of the substrate layer along the thickness direction of the substrate layer, the substrate layer and the bonding layer can transmit light, and the first anti-peeping layer and the second anti-peeping layer are connected through the bonding layer;
each peep-proof layer in the first peep-proof layer and the second peep-proof layer comprises a plurality of first transmission parts and a plurality of shading parts, the plurality of first transmission parts are arranged at intervals, one shading part is formed between every two adjacent first transmission parts, each shading part comprises two shading layers which are oppositely arranged, a second transmission part is formed in a hollow part between every two shading layers, and each shading layer is arranged on the side face of each first transmission part.
The peep-proof film comprises a substrate layer, a first peep-proof layer, a bonding layer and a second peep-proof layer which are sequentially arranged on one side of the substrate layer, wherein each peep-proof layer comprises a plurality of first transmission parts and a plurality of light shielding parts, one light shielding part is formed between every two adjacent first transmission parts, the light shielding parts are designed into a hollow shell structure, namely, the light shielding parts comprise two oppositely arranged light shielding layers, a hollow part is arranged between the two light shielding layers, and one second transmission part is formed in the hollow part; the anti-peeping film comprises two anti-peeping layers, the two anti-peeping layers are connected through the adhesive layer, not only can the connection of the two anti-peeping layers be realized, but also the adhesive layer can transmit light, and the light transmission effect is not affected when the light is seen through; in addition, under the condition that the thickness of the peep-proof film is unchanged, the adhesive layer is filled between the two peep-proof layers, and compared with a structure that the two peep-proof layers are directly connected through self-adhesion, the filling quantity of the shading material can be further reduced, so that the light transmittance is further improved.
Optionally, the thickness of each of the privacy layers is greater than or equal to 20 microns and less than or equal to 60 microns.
The thickness of the single peep-proof layer is larger than or equal to 20 mu m and smaller than or equal to 60 mu m and is basically half or smaller than that of the existing peep-proof layer, so that in the process of filling the shading material to form the shading part, the filling efficiency of the shading material can be effectively improved, and the problems of slow diffusion, easiness in wire drawing and the like are reduced. On the basis, the overall thickness of the two peep-proof layers is not greatly different from that of the existing single peep-proof layer, and the peep-proof effect is not affected under the condition that the light transmittance can be effectively improved (for example, 10% -15%) can be improved; in addition, under the condition that the peep-proof effect is not affected, the two peep-proof layers are connected through the bonding layer, so that the shading material can be further reduced, the light transmittance can be further improved, and for example, the light transmittance of 3% -5% can be further improved.
Alternatively, the light shielding portion is formed on the side surface of the first transmissive portion by press-rolling.
Compared with the mode of removing redundant light shielding materials after coating the light shielding parts on the outer surface of the first transmission part, the peep-proof film provided by the embodiment of the application adopts the mode that the light shielding parts are stamped by the press roller, so that the light shielding materials do not need to be removed through additional operation, and the process steps are reduced; in addition, the light shielding part is stamped by the pressing roller, so that the light shielding part can be stamped in one stamping process, the first transmission part can be formed, and compared with the mode that the first transmission part is formed first and then the light shielding part is formed, the process steps are further reduced. Therefore, the mode of stamping the shading part by the press roller is adopted, the processing process is more convenient and the process feasibility is higher.
Optionally, the refractive indexes of the first peep-proof layer and the second peep-proof layer are the same. Thus, the design process can be simplified, and the application feasibility is improved.
Optionally, the thickness of the first peep-proof layer is the same as the thickness of the second peep-proof layer. Thus, the design process can be simplified, and the application feasibility is improved.
Optionally, the first peep-proof layer and the second peep-proof layer are parallel; or alternatively, the first and second heat exchangers may be,
an included angle is formed between the first peep-proof layer and the second peep-proof layer, and the included angle is larger than 0 degree and smaller than 20 degrees.
Optionally, the thickness of the adhesive layer is greater than or equal to 10 microns and less than or equal to 40 microns.
According to the peep-proof film provided by the embodiment of the application, as the bonding layer needs to transmit light and is positioned between the two peep-proof layers, if the thickness of the bonding layer is designed to be too small, the thickness of the peep-proof layer can be increased, so that the filling efficiency of a shading material is influenced; if the thickness of the adhesive layer is designed to be too large, light rays from the side part may penetrate through the adhesive layer and finally reach the display screen, so that the peep-proof effect is affected. Therefore, the thickness of the adhesive layer is limited to a range of 10 μm to 40 μm, and the peep preventing effect and the filling efficiency of the light shielding material can be ensured as much as possible.
Optionally, the refractive indexes of the first peep-proof layer and the second peep-proof layer are the same; the method comprises the steps of,
the peep-proof angle of the peep-proof film is larger than the first angle theta 1 The first angle theta 1 The following first and second formulas are satisfied:
the first formula is: n is n 1 sinθ 1 ＝n 2 sinθ 2 ，
The second formula is:
n 1 is the refractive index of the peep-proof layer, n 2 Is the refractive index of the adhesive layer, theta 1 Is the incident angle theta of the light entering the first peep-proof layer 2 Is the refraction angle of light entering the bonding layer from the first peep-proof layer, d 1 A distance d between the light shielding portions and the substrate layer 2 Is the spacing of the first transmission part near one side of the substrate layer, d 3 A distance h between the light shielding portion and the side of the base material layer 1 Is the thickness of the first peep-proof layer, h 2 Is the thickness of the bonding layer, h 3 Is the thickness of the second privacy layer.
According to the peep-proof film provided by the embodiment of the application, by limiting the peep-proof angle to be larger than the first angle, light can be absorbed by the shading part of the second peep-proof layer and cannot pass through the first transmission part of the second peep-proof layer to reach the display screen.
Optionally, the peep-proof angle is larger than the second angle theta a The second angleAnd/or the number of the groups of groups,
The peep-proof angle is larger than a third angle theta b The second angle
According to the peep-proof film provided by the embodiment of the application, by limiting the peep-proof angle to be larger than the second angle, light can be absorbed by the shading part of the first peep-proof layer and cannot penetrate through the second transmission part of the first peep-proof layer to reach the display screen; by limiting the peep-proof angle to be larger than the third angle, the light can be absorbed by the shading part of the second peep-proof layer and can not pass through the second transmission part of the second peep-proof layer to reach the display screen.
Optionally, the thickness h of the adhesive layer 2 Less than the first thickness h 20 The first thickness h 20 A third formula is satisfied, the third formula being:
the peep-proof film provided by the embodiment of the application is formed by limiting the thickness h of the bonding layer 2 Less than the first thickness h 20 The light can not reach the first transmission part of the second peep-proof layer, is absorbed by the shading part of the second peep-proof layer, and can not penetrate the second peep-proof layer to reach the display screen.
Optionally, the cross section of the first transmission part is isosceles trapezoid or rectangle.
Optionally, the refractive index of the first transmissive portion is the same as the refractive index of the second transmissive portion.
In a second aspect, a method for preparing a privacy film is provided, the method comprising:
Coating a first transparent layer on the first substrate layer;
embossing a pressing roller coated with a shading material on the first transparent layer to form a first half peep-proof layer, wherein the first half peep-proof layer comprises a plurality of shading parts and a plurality of first transmission parts formed by embossing, the plurality of first transmission parts are arranged at intervals, one shading part is formed between two adjacent first transmission parts, the shading parts comprise two shading layers which are oppositely arranged and a hollow part formed between the two shading layers, and the shading layers are formed on the side surfaces of the first transmission parts;
carrying out ultraviolet UV curing on the first half peep-proof layer;
and filling transparent materials in the hollow part of the shading part to form a second transmission part so as to finally form a first peep-proof layer.
According to the preparation method of the peep-proof film, the surface of the pressing roller is coated with the shading material, the first transparent layer is stamped by the pressing roller, so that the shading part can be formed basically at one time; in addition, the first transparent layer is stamped by the pressing roller, and in the one-time stamping process, the shading part can be stamped, the first transmission part can also be formed, and compared with the mode that the shading part is formed after the first transmission part is formed on the first transparent layer, the process steps are further reduced. Therefore, the mode of pressing the shading part by the pressing roller is adopted, the processing process is more convenient and the process feasibility is higher. And the peep-proof film formed by the preparation method has the advantages that the second transmission part is formed in the hollow part between the two light shielding layers of the light shielding part of the first peep-proof layer, so that the first transmission part and the second transmission part can transmit light, the light transmittance is effectively improved, and the light shielding material is also saved.
Optionally, the method further comprises:
coating a bonding layer on the first peep-proof layer;
the second peep-proof layer comprises a plurality of first transmission parts and a plurality of shading parts, wherein in the second peep-proof layer, a plurality of first transmission parts are arranged at intervals, one shading part is formed between every two adjacent first transmission parts, the shading parts comprise two shading layers which are oppositely arranged and hollow parts which are formed between the two shading layers, the shading layers are arranged on the side surfaces of the first transmission parts, and one second transmission part is formed in the hollow parts between the two shading layers.
According to the preparation method of the peep-proof film, two peep-proof films are formed, the two peep-proof layers are connected through the adhesive layer, connection of the two peep-proof films can be achieved, the adhesive layer is transparent, and front-view rays can pass through the adhesive layer without affecting the light-transmitting effect; in addition, under the condition that the thickness of the peep-proof film is unchanged, the adhesive layer is filled between the two peep-proof layers, and compared with a structure that the two peep-proof layers are directly connected through self-adhesion, the filling quantity of the shading material can be further reduced, so that the light transmittance is further improved.
Optionally, the disposing a second peep-proof layer on the adhesive layer includes:
coating a second transparent layer on the adhesive layer;
embossing a pressing roller coated with a shading material on the second transparent layer to form a second half-peep-proof layer, wherein the second half-peep-proof layer comprises a plurality of shading parts and a plurality of first transmission parts which are formed by embossing;
UV curing the second semi-peeping layer;
and filling transparent materials in the hollow part of the shading part to form the second transmission part so as to finally form the second peep-proof layer.
According to the preparation method of the peep-proof film, due to the fact that certain pressure exists in the pressing roll embossing process, the mode of embossing the structure comprising the first substrate layer and the first peep-proof layer to form the second peep-proof layer can be applied to a scene with a harder first peep-proof layer.
Optionally, before disposing a second privacy layer on the adhesive layer, the method further comprises:
coating a second transparent layer on the second substrate layer;
embossing a pressing roller coated with a shading material on the second transparent layer to form a second half-peep-proof layer, wherein the second half-peep-proof layer comprises a plurality of shading parts and a plurality of first transmission parts which are formed by embossing;
UV curing the second semi-peeping layer;
filling a transparent material in the hollow part of the light shielding part to form the second transmission part so as to form the second peep-proof layer;
and removing the second substrate layer.
According to the preparation method of the peep-proof film, provided by the embodiment of the application, as a certain pressure exists in the pressing roll imprinting process, the first peep-proof layer can be possibly damaged in the imprinting process, so that the second peep-proof layer can be formed on the other substrate layer, then the substrate layer is removed, and the second peep-proof layer is adhered above the adhesive layer, and the mode can be suitable for a scene with softer first peep-proof layer.
Optionally, the thickness of each of the privacy layers is greater than or equal to 20 microns and less than or equal to 60 microns.
Optionally, the thickness of the adhesive layer is greater than or equal to 10 microns and less than or equal to 40 microns.
Drawings
Fig. 1 is a schematic diagram of an anti-peeping film adhered to an electronic device according to an embodiment of the present application.
Fig. 2 is a schematic structural view of a prior art privacy film.
Fig. 3 is a schematic structural view of a privacy film according to an embodiment of the present application.
Fig. 4 is another schematic structural view of a privacy film according to an embodiment of the present application.
Fig. 5-7 are schematic views of light passing through the privacy film of fig. 3 in various scenarios.
Fig. 8 is a schematic flow chart of a method for preparing a peep-proof film according to an embodiment of the present application.
Fig. 9 is a schematic process diagram of a method for preparing a privacy film according to an embodiment of the present application.
Reference numerals
100. An electronic device; 101. a housing; 102. a key; 103. a display screen; 10. a privacy film; 11. a substrate layer; 11a, a first substrate layer; 12. a bonding layer; 13. an anti-peeping layer; 130. a first transparent layer; 13a, a first peep-proof layer; 13b, a second peep-proof layer; 131. a first transmissive part; 132. a second transmissive part; 133. a light shielding layer; 134. a hollow portion; 138. a light shielding structure; 139. a transmissive structure; 20. and (3) a press roller.
Detailed Description
The technical scheme of the application will be described below with reference to the accompanying drawings.
The peep-proof film provided by the embodiment of the application can be applied to various electronic equipment. For example, the electronic device may be a mobile phone, tablet computer, desktop computer, or a wearable device.
Fig. 1 is a schematic diagram of an anti-peeping film adhered to an electronic device according to an embodiment of the present application. Referring to fig. 1, an electronic apparatus 100 includes a housing 101, and a display 103 is mounted on one side of the housing 101. The case 101 is formed with an accommodation space, and the display screen 101 is accommodated in the accommodation space of the case 101. Illustratively, taking a cell phone as an example, the housing 101 may be understood as a middle frame of the cell phone. By way of example, the display screen 101 may be a liquid crystal display (liquid crystal display, LCD) screen, an organic light emitting diode (organic light emitting diode, OLED) display screen, or the like, wherein the OLED display screen may be a flexible display screen or a rigid display screen. Optionally, the electronic device 100 further includes a key 102, where the key 102 is mounted on a side of the housing 101, and may be a switch key, a volume key, and the like of the electronic device.
The user obtains information through the display screen 103, in order to protect the privacy of the screen, the peep-proof film 10 is generally stuck on the display screen 103, and the peep-proof film 10 can protect the information displayed on the display screen 103, so that the front visible screen information and the side invisible screen information are realized, and people beside are prevented from seeing the screen information, so that the privacy of the user is protected.
Fig. 2 is a schematic structural view of a prior art privacy film. Referring to fig. 2, the peep-proof film 10 includes a substrate layer 11 and a peep-proof layer 13 disposed on one side of the substrate layer 11, the peep-proof layer 13 includes a light shielding structure 138 and a transmission structure 139, the light shielding structure 138 and the transmission structure 139 are distributed in a staggered manner, a light shielding structure 138 is filled between two adjacent transmission structures 139, and the light shielding structure 138 is in a solid structure. In this structure, since the light shielding structure 138 is a solid structure, the light cannot pass through the light shielding structure 138 in front view, and the light shielding structure 138 and the transmission structure 139 have a relatively large volume, which greatly affects the light transmittance of the privacy film. The transmittance of the peep-proof film with the structure at present is only 60-70%, and the actual experience effect is poor.
Based on this, the embodiment of the application provides a peep-proof film, in which a light shielding part is formed between two adjacent first transmission parts in the peep-proof film, the light shielding part is in a hollow shell structure, that is, the light shielding part comprises two light shielding layers which are oppositely arranged, a hollow part is arranged between the two light shielding layers, and a second transmission part is formed in the hollow part, and as the first transmission part and the second transmission part of the peep-proof film can transmit light, the light transmittance is effectively improved, and the light shielding material is saved; the anti-peeping film comprises two anti-peeping layers, the two anti-peeping layers are connected through the adhesive layer, not only can the connection of the two anti-peeping layers be realized, but also the adhesive layer can transmit light, and the light transmission effect is not affected when the light is seen through; in addition, under the condition that the thickness of the peep-proof film is unchanged, the adhesive layer is filled between the two peep-proof layers, and compared with a structure that the two peep-proof layers are directly connected through self-adhesion, the filling quantity of the shading material can be further reduced, so that the light transmittance is further improved.
Hereinafter, the structure of the privacy film according to the embodiment of the present application will be described in detail with reference to fig. 3 to 7.
Fig. 3 is a schematic structural view of a privacy film according to an embodiment of the present application. Referring to fig. 3, the privacy film 10 includes a substrate layer 11, a first privacy layer 13a, an adhesive layer 12, and a second privacy layer 13b.
Referring to fig. 3, each of the first and second peep-preventing layers 13a and 13b includes a plurality of first transmissive portions 131 and a plurality of light shielding portions, the plurality of first transmissive portions 131 being disposed at intervals, and one light shielding portion being formed between two adjacent first transmissive portions 131. The light shielding portion includes two light shielding layers 133 disposed opposite to each other, and a space between the two light shielding layers 133 is formed with one second transmitting portion 132. The light shielding layer 133 is disposed on the side surface of the first transmissive portion 131, in other words, the light shielding layer 133 is disposed between the adjacent first and second transmissive portions 131 and 132, that is, the light shielding layer 133 is disposed between the outer surface of the first transmissive portion 131 and the outer surface of the second transmissive portion 132.
It is understood that the light shielding part is a hollow shell structure having two light shielding layers 133 disposed opposite to each other and a hollow part between the two light shielding layers 133, the hollow part being filled with a transparent material and formed as the second transmitting part 131. Thus, the light can not only pass through the first transmission part 131, but also pass through the second transmission part 132 in the shading part, so that the light transmittance can be effectively improved, and a large amount of shading materials are saved.
Illustratively, the plurality of first transmissive portions 131 are uniformly arranged, and the plurality of first transmissive portions 131 may be uniform in shape and size.
Illustratively, the pitches between the plurality of first transmissive parts 131 are uniform.
It is understood that the shape, size and spacing of the light shielding portions and the second light transmitting portions 132 depend on the design of the first transmitting portion 131.
The first and second transmissive parts 131 and 132 are each made of a transparent material, and may be made of, for example, a transparent Ultraviolet (UV) light curable adhesive. The UV light curing adhesive is characterized in that materials can be fixed after UV illumination, and shapes can be set according to requirements before curing.
The materials of the first and second transmissive parts 131 and 32 may be the same or different. When the materials of the first and second transmissive parts 131 and 132 are the same, the refractive indexes of the first and second transmissive parts 131 and 132 are the same. When the materials of the first and second transmissive parts 131 and 132 are different, the refractive indexes of the first and second transmissive parts 131 and 132 are different.
The light shielding layer 133 of the light shielding portion is made of a light shielding material that is opaque, and the light shielding layer 132 may be made of black ink, for example. In other examples, the light shielding layer 133 may be made of a light shielding material such as gray ink, white ink, or the like, and the embodiment of the present application is not limited in any way.
In the embodiment of the application, the light shielding part has a hollow shell structure, and the light shielding layer 133 of the light shielding part has a layered structure. The light shielding layer 133 is thinner, and the light shielding layer 133 may have a thickness of 0.005 micrometers (μm) or more and 2 μm or less, for example.
Referring to fig. 3, among the first peep-preventing layer 13a, the adhesive layer 12 and the second peep-preventing layer 13b, the first peep-preventing layer 13a, the adhesive layer 12 and the second peep-preventing layer 13b are sequentially disposed on one side of the substrate layer 11 along the thickness direction of the substrate layer 11. That is, the first privacy film 13a is close to the substrate layer 11, the second privacy film 13b is far from the substrate layer 11, and the adhesive layer 12 is located between the first privacy film 13a and the second privacy film 13 b. Wherein, the first peep-proof layer 13a and the second peep-proof layer 13b are connected through the bonding layer 12, one side of the first peep-proof layer 13a far away from the substrate layer 11 is connected with the bonding layer 12, one side of the second peep-proof layer 13b near the substrate layer 11 is connected with the bonding layer 12, thereby connecting the first peep-proof layer 13a and the second peep-proof layer 13b through the bonding layer 12.
It is understood that the thickness direction of the base material layer 11 is also the thickness direction of the electronic device.
Both the substrate layer 11 and the bonding layer 12 can transmit light to realize the light transmission effect of the peep-proof film.
The base material layer 11 serves as a base of the privacy film and has a supporting function. In one example, the substrate layer 11 may be made of glass, PET, TPU, PC, or PMMA. In other examples, substrate layer 11 may also be made from a mixture of materials, for example, substrate layer 11 may be made from a blend of glass, PET, TPU, PC, or PMMA, inorganic fillers (e.g., glass fibers, nanowhiskers, carbon nanotubes, montmorillonite, talc, etc.), and other modifying components (including, but not limited to, antioxidants, antimicrobial agents, impact modifiers, etc.).
The adhesive layer 12 has the function of adhering the two privacy layers. Illustratively, the adhesive layer 12 may be made of silicone adhesive, optical OCA adhesive, or acrylic glue, among others.
When the privacy film 10 is adhered to a display screen of an electronic device, the substrate layer 11 is at a side far away from the display screen, and light is incident from the side of the substrate layer 11, passes through the second privacy layer 13a, and reaches the display screen.
In the multiple peep-proof layers in the prior art, the peep-proof layers have adhesion, so that the two peep-proof layers are generally directly connected through the adhesion of the peep-proof layers. In the application, under the condition that the thickness of the peep-proof film is unchanged, the adhesive layer 12 is filled between the two peep-proof layers 13 to connect the two peep-proof layers 13 through the adhesive layer 12, compared with a structure that the two peep-proof layers 13 are directly connected through self-adhesion, the filling amount of the shading material can be further reduced, and the light transmittance is further improved.
In addition, the bonding layer 12 not only can realize the connection of the two peep-proof layers 13, but also can transmit light, and the light transmission effect is not affected when the bonding layer 12 is transparent.
The peep-proof film comprises a substrate layer, a first peep-proof layer, a bonding layer and a second peep-proof layer which are sequentially arranged on one side of the substrate layer, wherein each peep-proof layer comprises a plurality of first transmission parts and a plurality of light shielding parts, one light shielding part is formed between every two adjacent first transmission parts, the light shielding parts are designed into a hollow shell structure, namely, the light shielding parts comprise two oppositely arranged light shielding layers, a hollow part is arranged between the two light shielding layers, and one second transmission part is formed in the hollow part; the anti-peeping film comprises two anti-peeping layers, the two anti-peeping layers are connected through the adhesive layer, not only can the connection of the two anti-peeping layers be realized, but also the adhesive layer can transmit light, and the light transmission effect is not affected when the light is seen through; in addition, under the condition that the thickness of the peep-proof film is unchanged, the adhesive layer is filled between the two peep-proof layers, and compared with a structure that the two peep-proof layers are directly connected through self-adhesion, the filling quantity of the shading material can be further reduced, so that the light transmittance is further improved.
Referring to fig. 3, in some embodiments, the cross section of the first transmissive part 131 is trapezoidal. The cross section of the first transmitting part 131 is exemplarily an isosceles trapezoid.
Correspondingly, the cross section of the second transmitting portion 132 is also trapezoid, which is inverted to the trapezoid of the first transmitting portion 131, and is inverted trapezoid.
In the first transmission portion 131, the base having a longer width is close to the base material layer 11, the base having a shorter width is away from the base material layer 11, and the base having a shorter width is close to the base material layer 11, and the base having a longer width is away from the base material layer 11, and is in the shape of an inverted trapezoid in the second transmission portion 132.
Referring to fig. 4, fig. 4 is another schematic structural view of a privacy film according to an embodiment of the present application. In another embodiment, the cross section of the first transmitting part 131 is rectangular. Correspondingly, the cross section of the second transmissive portion 132 is also rectangular.
It should be understood that in this embodiment, the size of the rectangle of the first transmitting portion 131 may be the same as or different from the size of the rectangle of the second transmitting portion 132, and the embodiment of the present application is not limited in any way, and a structure with different sizes is shown in the drawings.
For the privacy layers 13, in some embodiments, the thickness of each privacy layer 13 is less than 100 μm.
Illustratively, the thickness of the privacy layer 13 is greater than or equal to 20 μm and less than or equal to 60 μm. For example, the thickness of the privacy layer 13 may be 20 μm, 30 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, etc.
In the peep-proof film (such as the peep-proof film shown in fig. 2) of the light shielding part with a solid structure in the prior art, the thinner the peep-proof layer is, the more the light shielding material needs to be filled, so in order to achieve both the peep-proof angle and the light transmittance, the thickness of the peep-proof layer in the prior art is higher and is in the range of 100-150 μm, so that the filling efficiency of the light shielding material is reduced, and the problems of wire drawing, slow diffusion and the like are easily generated in the filling process.
In the present application, the thickness of the single peep-proof layer 13 is greater than or equal to 20 μm and less than or equal to 60 μm, which is substantially half or less of the thickness of the existing peep-proof layer, so that the filling efficiency of the light-shielding material can be effectively improved, and problems of slow diffusion, easy wire drawing, etc. can be reduced in the process of filling the light-shielding material to form the light-shielding portion. On the basis, the overall thickness of the two peep-proof layers 13 is not greatly different from that of the existing single peep-proof layer, and the peep-proof effect is not affected under the condition that the light transmittance can be effectively improved (for example, 10% -15%) can be improved; in addition, under the condition that the peep-proof effect is not affected, the two peep-proof layers 13 are connected through the bonding layer 12, the shading material can be further reduced, so that the light transmittance is further improved, for example, the light transmittance of 3% -5% can be further improved.
In some embodiments, referring to FIG. 3, the spacing d between two adjacent light shielding portions 0 Greater than or equal to 40 μm and less than or equal to 60 μm.
It will be appreciated that the spacing between adjacent light-shielding portions may be expressed by the distance between the structures at the same location of the two light-shielding portions, such that a unique distance value may be obtained. For example, in the orientation of fig. 3, the pitch between adjacent two light shielding portions is represented by the distance between the end portions of the light shielding layer 133 on the left side of the two light shielding portions.
Illustratively, the spacing d between adjacent light shielding portions 0 May be 40 μm, 45 μm, 50 μm, 55 μm or 60 μm, etc.
In the embodiment of the present application, the interval between two adjacent light shielding portions and the interval between two adjacent first transmission portions 131 may be the same or different, and are not limited in any way. Illustratively, in the structures shown in fig. 3 and 4, the interval between the adjacent two light shielding portions is different from the interval between the adjacent two first transmitting portions 131, and the interval between the adjacent two light shielding portions is smaller than the interval between the adjacent two first transmitting portions 131.
It should be understood that since the second transmitting portions 132 are formed in the light shielding portions, the interval between adjacent two light shielding portions is also the interval between adjacent two second transmitting portions 132.
With respect to the adhesive layer 12, in some embodiments, the thickness of the adhesive layer 12 is greater than or equal to 10 μm and less than or equal to 40 μm.
Illustratively, the thickness of the adhesive layer 12 is greater than or equal to 20 μm and less than or equal to 40 μm. For example, the thickness of the adhesive layer 12 may be 10 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, etc.
With respect to the substrate layer 11, in some embodiments, the thickness of the substrate layer 11 is greater than or equal to 20 μm and less than or equal to 40 μm.
For example, the thickness of the base material layer 11 may be 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, or the like.
It should be understood that the dimensions of the peep-proof layer 13, the adhesive layer 12 and the substrate layer 11 described above are only illustrative, and should not be construed as limiting the embodiments of the application, and the dimensions of the peep-proof layer 13, the adhesive layer 12 and the substrate layer 11 may be any other values.
Because the bonding layer 12 needs to transmit light and is positioned between the two peep-proof layers 13, if the thickness of the bonding layer 12 is designed to be too small, the thickness of the peep-proof layers 13 can be increased, so that the filling efficiency of the shading material is affected; if the thickness of the adhesive layer 12 is designed to be too large, light from the side may pass through the adhesive layer 12 and finally reach the display screen, thereby affecting the peep-proof effect. Therefore, the thickness of the adhesive layer 12 is limited to a range of 10 μm to 40 μm, and the peep preventing effect and the filling efficiency of the light shielding material can be ensured as much as possible.
In the embodiment of the present application, the light shielding portion is formed on the outer surface of the first transmitting portion 131 by press-embossing.
In the process of preparing the first peep-preventing layer 13a, a transparent layer is coated on the substrate layer 11, a plurality of annular protrusions are circumferentially and alternately distributed on the pressing roller, a light shielding material is coated on the outer surfaces of the protrusions, the pressing roller is stamped on the transparent layer, a structure with a plurality of light shielding portions and a plurality of first transmission portions 131 can be formed, and as the light shielding portions are internally provided with hollow portions, then, the hollow portions of the light shielding portions are filled with the transparent material, so that the second transmission portions 132 are formed, and finally, the first peep-preventing layer 13a is formed. In a similar manner, a second privacy layer 13b is formed over the first privacy layer 13a.
Because the surface of the press roller is coated with the shading material, the shading part is stamped by the press roller, compared with the mode of coating the shading part on the outer surface of the first transmission part and then removing the redundant shading material, the mode of stamping the shading part by the press roller is adopted, the shading material is not required to be removed through additional operation, and the process steps are reduced; in addition, the light shielding part is stamped by the pressing roller, so that the light shielding part can be stamped in one stamping process, the first transmission part can be formed, and compared with the mode that the first transmission part is formed first and then the light shielding part is formed, the process steps are further reduced. Therefore, the mode of pressing the shading part by the pressing roller is adopted, the processing process is more convenient and the process feasibility is higher.
Next, two peep-proof layers 13 will be described.
In some embodiments, the refractive index of the first and second privacy layers 13a, 13b are the same. Thus, the design process can be simplified, and the application feasibility is improved.
It should be understood that the refractive indexes of the first peep-preventing layer 13a and the second peep-preventing layer 13b are the same, and it is indicated that the refractive indexes of the light-transmitting structures (the first transmitting portion 131 and the second transmitting portion 132) of the first peep-preventing layer 13a and the second peep-preventing layer 13b are the same.
It should also be understood that when the refractive indexes of the first peep-preventing layer 13a and the second peep-preventing layer 13b are the same, it means that the light-transmitting structures (the first transmitting portion 131 and the second transmitting portion 132) of the first peep-preventing layer 13a and the second peep-preventing layer 13b are made of the same material.
Of course, in other embodiments, the refractive indexes of the first peep-proof layer 13a and the second peep-proof layer 13b may be the same, which is not limited in any way.
In some embodiments, the thickness of the first privacy layer 13a and the second privacy layer 13b are the same. Thus, the design process can be simplified, and the application feasibility is improved.
Of course, in other embodiments, the thicknesses of the first peep-proof layer 13a and the second peep-proof layer 13b may be the same, which is not limited in any way.
In some embodiments, the first privacy layer 13a and the second privacy layer 13b form an included angle therebetween that is greater than 0 degrees and less than 20 degrees. Thus, the multi-angle peep-proof effect can be achieved.
Illustratively, the included angle between the first and second privacy layers 13a, 13b is greater than 0 degrees and less than or equal to 10 degrees. For example, the included angle may be 2 degrees, 5 degrees, 7 degrees, 10 degrees, etc.
In other embodiments, the first privacy layer 13a and the second privacy layer 13b are parallel.
In the following, the relationship between the peep-proof angle of the peep-proof film and the dimensions of each structure is described with reference to fig. 5 to 7.
Assuming that the refractive indexes of the first peep-preventing layer 13a and the second peep-preventing layer 13b are the same, referring to fig. 5, the peep-preventing angle of the peep-preventing film 10 is larger than the first angle θ 1 First angle theta 1 The following first and second formulas are satisfied:
the first formula is: n is n 1 sinθ 1 ＝n 2 sinθ 2 ，
The second formula is:
wherein n is 1 Is the refractive index of the peep-proof layer 13, n 2 Is the refractive index of the adhesive layer 12, θ 1 Is the incident angle theta of the light entering the first peep-proof layer 13a 2 Is the refraction angle d of the light entering the adhesive layer 12 from the first peep-proof layer 13a 1 Is the spacing of the light shielding part near the side of the substrate layer 11, d 2 Is the distance d between the first transmission part 131 and the substrate layer 11 3 Is the spacing of the light shielding part at the side far away from the substrate layer 11, h 1 Is the thickness of the first peep-proof layer 13a, h 2 Is the thickness of the adhesive layer 12, h 3 Is the thickness of the second privacy layer 13 b.
When the thickness h of the first peep-proof layer 13a 1 Thickness h of the second peep-proof layer 13b 3 When the same, the second formula can be changed to
When the cross sections of the first and second transmissive parts 131 and 132 are rectangular, d 1 ＝d 3 。
In the above formula, the first angle θ 1 It can be understood that the critical peep-proof angle is equal to the first angle θ 1 When the light is transmitted through the first transmitting portion 131 of the second peep-preventing layer 13b, the peep-preventing angle is larger than the first angle θ 1 In this case, the light is absorbed by the light shielding portion of the second peep-preventing layer 13b, and cannot pass through the first transmitting portion 131 of the second peep-preventing layer 13b to reach the display screen.
Referring to fig. 5, the second formula may be obtained by combining formula 1 and formula 2, i.e., s to be obtained by formula 2 1 Sum s 3 Substituting into equation 1 yields a second equation, wherein,
equation 1 is:equation 2 is: />
Referring to fig. 6, in some embodiments, in order to prevent light from passing through the second transmissive portion 132 of the first peep-preventing layer 13a, the peep-preventing angle is further greater than the second angle θ a Second angle
Second angle theta a It can be understood that another critical peep-proof angle is provided that when the peep-proof angle is equal to the second angle θ a When the light is transmitted through the second transmission portion 132 of the first peep-preventing layer 13a, the peep-preventing angle is larger than the second angle θ a In this case, the light is absorbed by the light shielding portion of the first peep-preventing layer 13a, and cannot pass through the second transmission portion 132 of the first peep-preventing layer 13a to reach the display screen.
Referring to fig. 6, in some embodiments, in order to prevent light from passing through the second transmissive portion 132 of the second peep-preventing layer 13b, the peep-preventing angle is further greater than the third angle θ b Third angle
Third angle theta b It can be understood that another critical peep-proof angle is when the peep-proof angle is equal to θ b When the light is transmitted through the second transmission portion 132 of the second peep-preventing layer 13b, the peep-preventing angle is larger than θ b In this case, the light is absorbed by the light shielding portion of the second peep-preventing layer 13b, and cannot pass through the second transmitting portion 132 of the second peep-preventing layer 13b to reach the display screen.
When the thickness h of the first peep-proof layer 13a 1 Thickness h of the second peep-proof layer 13b 3 At the same time, a second angle theta a And a third angle theta b The same applies.
Referring to FIG. 7, in some embodiments, to preventThe light-stopping ray penetrates through the second peep-proof layer 13b through the bonding layer 12, and the thickness h of the bonding layer 12 2 Less than the first thickness h 20 The first thickness satisfies a third formula, and h can be obtained by combining the third formula with the first formula 20 Wherein, the method comprises the steps of, wherein,
the third formula is:/>
in the above formula, h 20 It can be understood that the critical thickness of the adhesive layer 12, when the thickness h of the adhesive layer 12 2 Equal to h 20 When the light just passes through the first transmitting portion 131 of the second peep-proof layer 13b, the thickness h of the adhesive layer 12 2 Less than h 20 In this case, the light cannot reach the first transmission portion 131 of the second peep-preventing layer 13b, and is absorbed by the light shielding portion of the second peep-preventing layer 13b, and cannot pass through the second peep-preventing layer 13b to reach the display screen.
Referring to fig. 7, a third formula may be obtained by combining formula 3 and formula 4, i.e., s obtained by combining formula 3 1 Substituting into equation 4 yields a third equation, wherein,
equation 3 is:equation 4 is: />
Hereinafter, a method for preparing the privacy film according to the embodiment of the present application will be described in detail with reference to fig. 8 and 9.
Fig. 8 is a schematic flow chart of a method 200 for preparing a privacy film according to an embodiment of the present application, and fig. 9 is a process schematic diagram of the method for preparing a privacy film according to an embodiment of the present application.
In step S210, the first transparent layer 130 is coated on the first base material layer 11a, and a structure shown in fig. 9 (a) is formed.
In step S220, referring to (b) of fig. 9, the press roller 20 coated with the light shielding material is embossed on the first transparent layer 130 to form a first half peep preventing layer as shown in (c) of fig. 9, the first half peep preventing layer including a plurality of light shielding portions and a plurality of first transmitting portions 131 formed by embossing, the plurality of first transmitting portions 131 being disposed at intervals, one light shielding portion being formed between adjacent two first transmitting portions 131, wherein the light shielding portion includes two light shielding layers 133 disposed opposite to each other and a hollow portion 134 formed between the two light shielding layers 133, and the light shielding layers 133 are formed on sides of the first transmitting portions 131.
It will be appreciated that the pressing roller 20 is provided with a plurality of annular protrusions spaced apart in the circumferential direction, and the outer surfaces of the annular protrusions are coated with a light shielding material, so that the pressing roller can imprint a plurality of light shielding portions on the first transparent layer 130, and a plurality of first transmitting portions 131 are also formed. It will be appreciated that after embossing is completed, the shape of the cross section of the hollow 134 of the embossed light shielding portion matches the shape of the cross section of the annular protrusion of the pressing roller 20.
In step S230, the first half peep-proof layer is subjected to ultraviolet UV curing. Thus, the rigidity of the privacy film can be improved.
The first half peep-proof layer can be placed under the ultraviolet lamp tube and can be cured after being irradiated by ultraviolet rays for a certain period of time, the hardness after curing is high, the method is economical and practical, and the glue irradiated by the ultraviolet rays can be reused.
In step S240, the hollow portion 134 of the light shielding portion is filled with a transparent material to form the second transmission portion 132, so as to finally form the first peep preventing layer 13a as shown in (d) of fig. 9.
Thus, through the above steps, a privacy film having a single privacy layer, the privacy film first substrate layer 11a and the first privacy layer 13a, can be manufactured.
In the above preparation method, since the surface of the pressing roller 20 is coated with the light shielding material, the light shielding portion is stamped on the first transparent layer 130 by the pressing roller 20, compared with the method of removing the excessive light shielding material after coating the light shielding portion on the outer surface of the first transmission portion 131, the method of stamping the light shielding portion by the pressing roller 20 is adopted, and the additional operation is not required to remove the light shielding material, thereby reducing the process steps; in addition, the pressing roller 20 is adopted to imprint the first transparent layer 130, so that not only the light shielding part can be imprinted in one imprinting process, but also the first transmission part 131 can be formed, and compared with the mode that the first transmission part 131 is formed on the first transparent layer 130 before the light shielding part is formed, the process steps are further reduced. Therefore, the light shielding part is stamped by the press roller 20, so that the processing process is more convenient and the process feasibility is higher.
Compared with the peep-proof film which only can pass through the first transmission part due to the light shielding part with a solid structure in the prior art, the peep-proof film formed by the preparation method has the advantages that the first transmission part 131 and the second transmission part 132 can pass through the light due to the fact that the second transmission part 132 is formed in the hollow part and the hollow part is arranged in the light shielding part, the light transmittance is effectively improved, and the light shielding material is saved.
In the privacy film having two privacy layers, the steps of preparing the second privacy layer 13b in the preparation method 200 are as follows:
the first peep-preventing layer 13a is coated with the adhesive layer 12, and a structure as shown in fig. 9 (e) can be formed.
The second peep-proof layer 13b is disposed on the adhesive layer 12, and a structure as shown in fig. 9 (f) can be formed, and the structure of the second peep-proof layer 13b is the same as that of the first peep-proof layer 13a, and will not be described again.
In some embodiments, the second privacy layer 13b is provided on the adhesive layer 12 as follows:
coating a second transparent layer on the adhesive layer 12;
embossing the pressing roller coated with the shading material on the second transparent layer to form a second half peep-proof layer, wherein the second half peep-proof layer comprises a plurality of shading parts and a plurality of first transmission parts 131 formed by embossing;
UV curing is carried out on the second half peep-proof layer;
the hollow portion 134 of the light shielding portion is filled with a transparent material to form a second transmission portion 132, so as to finally form a second peep-proof layer 13b.
That is, the second semi-peep-preventing film is directly formed on the second transparent layer of the adhesive layer 12 by pressing and embossing, and then the second transmissive portion 132 is formed in the hollow portion 134 of the light shielding portion by UV curing, so as to finally form the second peep-preventing layer 13b.
Since there is a certain pressure in the pressing process, damage may be caused to the first peep-preventing layer 13a in the pressing process, and thus, the manner of forming the second peep-preventing layer 13b is applicable to a hard scene of the first peep-preventing layer 13 a.
If the first peep-proof layer 13a is relatively soft, the first peep-proof layer 13a may be damaged during the imprinting process, so in other embodiments, the second peep-proof layer 13b may be formed on another substrate layer, then the substrate layer is removed, and the second peep-proof layer 13b may be adhered above the adhesive layer 12. The specific process is as follows:
before the second peep-proof layer 13b is arranged on the bonding layer 12, the preparation method further comprises the following steps:
coating a second transparent layer on the second substrate layer;
embossing the pressing roller 20 coated with the light shielding material on the second transparent layer to form a second half peep preventing layer including a plurality of light shielding parts and a plurality of first transmitting parts 131 formed by embossing;
UV curing is carried out on the second half peep-proof layer;
a transparent material is filled in the hollow part 134 of the light shielding part to form a second transmission part 132 so as to form a second peep-proof layer;
and removing the second substrate layer.
For a specific description of the structures of the first and second peep-preventing layers 13a and 13b obtained by the above preparation method, reference may be made to the above related description, and the description is omitted.
It should be understood that in embodiments of the present application, the terms "connected," "fixedly connected," "in contact," and the like are to be construed broadly unless explicitly stated or limited otherwise. The specific meaning of the various terms described above in embodiments of the present application will be understood by those of ordinary skill in the art as the case may be.
For "connection", various connection modes such as fixed connection, rotational connection, flexible connection, sliding connection, integral formation, electrical connection, contact connection, and the like are exemplified; may be directly connected, or may be indirectly connected through an intervening medium, or may be in communication between two elements or in an interactive relationship therebetween.
For example, for "fixedly coupled," it may be that one element is directly or indirectly coupled to another element; the fixed connection can comprise mechanical connection, welding, bonding or integral forming and the like, wherein the mechanical connection can comprise riveting, bolting, screwing, key pin connection, buckling connection, locking connection, grafting and the like, and the bonding can comprise adhesive bonding, solvent bonding and the like.
For example, the term "contacting" may be interpreted as a direct contact or an indirect contact of one element with another element; furthermore, the contact between the two elements described in the embodiments of the present application can be understood as a contact within the allowable range of the mounting error, and there may be a small gap due to the mounting error.
It should also be understood that the description of embodiments of the present application as "parallel" or "perpendicular" may be understood as "approximately parallel" or "approximately perpendicular".
It should also be appreciated that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Features defining "first", "second" may include one or more such features, either explicitly or implicitly.
In embodiments of the application, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It should be further understood that the terms "inner," "outer," "upper," "bottom," "front," "rear," and the like indicate or relate to positions or locations, if any, as shown in the drawings, merely to facilitate describing the application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application.
In embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "at least part of an element" means part or all of the element. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship.
It should be noted that, in the embodiment of the present application, the same reference numerals denote the same components or the same parts, and for the same parts in the embodiment of the present application, reference numerals may be given to only one of the parts or the parts in the drawings, and it should be understood that, for other same parts or parts, the reference numerals are equally applicable.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application should be defined by the claims, and the above description is only a preferred embodiment of the technical solution of the present application, and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (18)
1. A privacy film, comprising: the anti-peeping device comprises a substrate layer, a first anti-peeping layer, a bonding layer and a second anti-peeping layer, wherein the first anti-peeping layer, the bonding layer and the second anti-peeping layer are sequentially arranged on one side of the substrate layer along the thickness direction of the substrate layer, the substrate layer and the bonding layer can transmit light, and the first anti-peeping layer and the second anti-peeping layer are connected through the bonding layer;
each peep-proof layer in the first peep-proof layer and the second peep-proof layer comprises a plurality of first transmission parts and a plurality of shading parts, the plurality of first transmission parts are arranged at intervals, one shading part is formed between every two adjacent first transmission parts, each shading part comprises two shading layers which are oppositely arranged, a second transmission part is formed in a hollow part between every two shading layers, and each shading layer is arranged on the side face of each first transmission part.
2. The privacy film of claim 1, wherein the thickness of each privacy layer is greater than or equal to 20 microns and less than or equal to 60 microns.
3. The privacy film according to claim 1 or 2, wherein the light shielding portion is formed on the side surface of the first transmissive portion by embossing with a pressing roller.
4. A privacy film according to any one of claims 1 to 3, wherein the refractive indices of the first privacy layer and the second privacy layer are the same.
5. The privacy film of any of claims 1-4, wherein the thickness of the first privacy layer and the second privacy layer are the same.
6. The privacy film of any one of claims 1 through 5,
the first peep-proof layer is parallel to the second peep-proof layer; or alternatively, the first and second heat exchangers may be,
an included angle is formed between the first peep-proof layer and the second peep-proof layer, and the included angle is larger than 0 degree and smaller than 20 degrees.
7. The privacy film of any of claims 1-6, wherein the adhesive layer has a thickness of greater than or equal to 10 micrometers and less than or equal to 40 micrometers.
8. The privacy film of any of claims 1-7, wherein the refractive index of the first privacy layer and the second privacy layer are the same; the method comprises the steps of,
The peep-proof angle of the peep-proof film is larger than the first angle theta 1 The first angle theta 1 The following first and second formulas are satisfied,
the first formula is: n is n 1 sinθ 1 ＝n 2 sinθ 2 ，
The second formula is:
n 1 is the refractive index of the peep-proof layer, n 2 Is the refractive index of the adhesive layer, theta 1 Is the incident angle theta of the light entering the first peep-proof layer 2 Is the refraction angle of light entering the bonding layer from the first peep-proof layer, d 1 A distance d between the light shielding portions and the substrate layer 2 Is the spacing of the first transmission part near one side of the substrate layer, d 3 A distance h between the light shielding portion and the side of the base material layer 1 Is the thickness of the first peep-proof layer, h 2 Is the thickness of the bonding layer, h 3 Is the thickness of the second privacy layer.
9. The privacy film of claim 8, wherein the privacy angle is greater than the second angle θ a The second angleAnd/or the number of the groups of groups,
the peep-proof angle is larger than a third angle theta b The third angle
10. The privacy film of claim 8 or 9, wherein the adhesive layer has a thickness h 2 Less than the first thickness h 20 The first thickness h 20 A third formula is satisfied, the third formula being:
11. The privacy film of any one of claims 1-10, wherein the cross-section of the first transmissive portion is isosceles trapezoid or rectangle.
12. The privacy film of any one of claims 1 through 11, wherein the refractive index of the first transmissive portion is the same as the refractive index of the second transmissive portion.
13. A method for preparing an anti-peeping film, which is characterized by comprising the following steps:
coating a first transparent layer on the first substrate layer;
embossing a pressing roller coated with a shading material on the first transparent layer to form a first half peep-proof layer, wherein the first half peep-proof layer comprises a plurality of shading parts and a plurality of first transmission parts formed by embossing, the plurality of first transmission parts are arranged at intervals, one shading part is formed between two adjacent first transmission parts, the shading parts comprise two shading layers which are oppositely arranged and a hollow part formed between the two shading layers, and the shading layers are formed on the side surfaces of the first transmission parts;
carrying out ultraviolet UV curing on the first half peep-proof layer;
and filling transparent materials in the hollow part of the shading part to form a second transmission part so as to finally form a first peep-proof layer.
14. The method of claim 13, wherein the method further comprises:
coating a bonding layer on the first peep-proof layer;
the second peep-proof layer comprises a plurality of first transmission parts and a plurality of shading parts, wherein in the second peep-proof layer, a plurality of first transmission parts are arranged at intervals, one shading part is formed between every two adjacent first transmission parts, the shading parts comprise two shading layers which are oppositely arranged and hollow parts which are formed between the two shading layers, the shading layers are arranged on the side surfaces of the first transmission parts, and one second transmission part is formed in the hollow parts between the two shading layers.
15. The method of claim 14, wherein disposing a second privacy layer on the adhesive layer comprises:
coating a second transparent layer on the adhesive layer;
embossing a pressing roller coated with a shading material on the second transparent layer to form a second half-peep-proof layer, wherein the second half-peep-proof layer comprises a plurality of shading parts and a plurality of first transmission parts which are formed by embossing;
UV curing the second semi-peeping layer;
And filling transparent materials in the hollow part of the shading part to form the second transmission part so as to finally form the second peep-proof layer.
16. The method of claim 14, wherein prior to disposing a second privacy layer on the adhesive layer, the method further comprises:
coating a second transparent layer on the second substrate layer;
embossing a pressing roller coated with a shading material on the second transparent layer to form a second half-peep-proof layer, wherein the second half-peep-proof layer comprises a plurality of shading parts and a plurality of first transmission parts which are formed by embossing;
UV curing the second semi-peeping layer;
filling a transparent material in the hollow part of the light shielding part to form the second transmission part so as to form the second peep-proof layer;
and removing the second substrate layer.
17. The method of any one of claims 14 to 16, wherein the thickness of the bonding layer is greater than or equal to 10 microns and less than or equal to 40 microns.
18. The method according to any one of claims 13 to 17, wherein each of the privacy layers has a thickness of greater than or equal to 20 microns and less than or equal to 60 microns.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211731733.3A CN116661037B (en) | 2022-12-30 | 2022-12-30 | Peep-proof film and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN213618709U (en) * | 2020-09-30 | 2021-07-06 | 深圳凯茵思科技有限公司 | Peep-proof film |
| CN218122282U (en) * | 2022-09-08 | 2022-12-23 | 江阴通利光电科技有限公司 | Peep-proof film |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN213618709U (en) * | 2020-09-30 | 2021-07-06 | 深圳凯茵思科技有限公司 | Peep-proof film |
| CN218122282U (en) * | 2022-09-08 | 2022-12-23 | 江阴通利光电科技有限公司 | Peep-proof film |
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