Peep-proof film and display equipment

Abstract

The utility model discloses a peep-proof film and a display device, the peep-proof film includes: a plurality of light absorption structures including first absorption structures and second absorption structures, the first absorption structures extend from a light-emitting surface to a light-incident surface along a second direction, the widths of the first absorption structures are gradually reduced along the second direction, and the second absorption structures extend from the light-emitting surface along the second direction, and the widths of the second absorption structures are gradually reduced along the second direction; a gap is formed between the end part and the light incident surface; and the plurality of transmission structures are positioned in gaps between the adjacent light absorption structures. When the observation angle is larger than the angle range of the central highlight area, part of light can pass through the gap at the end part of the second absorption structure, so that the brightness of the light cannot be quickly reduced to zero; the angle range of the central highlight area can be controlled by adjusting the width of the first transmission structure and the height of the first absorption structure, and the central highlight area is adaptive to use scenes with different window requirements; the brightness reduction rate of the emergent light of the peep-proof film can be adjusted by adjusting the height of the second absorption structure, and the requirements of different scenes are met.

Description

Technical Field

[0001] This utility model belongs to the field of privacy film technology, specifically relating to a privacy film and display device. Background Technology

[0002] With the rapid development of electronic information technology, display devices are being used more and more widely. People often read information through devices such as LCD monitors and LED displays. In some special applications, the viewing angle of display devices needs to be limited to a certain range. Therefore, a privacy screen protector is often added to the surface of the display device to limit the viewing angle.

[0003] Existing privacy films use an alternating black and white grid structure. The white structure allows light to pass through, while the black structure blocks light to control the viewing angle. The black and white grids are often arranged in a 1:1 ratio and have a uniform height, so the viewing angle is relatively small and difficult to adjust, which cannot meet the needs of specific scenarios.

[0004] In addition, due to structural limitations, the brightness of existing privacy screen protectors generally decreases gradually as the viewing angle increases, until the brightness drops rapidly to almost zero after the viewing angle reaches the maximum viewing angle. This cannot meet the needs of specific scenarios, such as scenarios that require high brightness within a certain angle range and low brightness beyond that range. Utility Model Content

[0005] The purpose of this application is to provide a privacy screen protector and display device to solve the technical problem that the brightness of the privacy screen protector drops rapidly to almost zero after the viewing angle reaches the maximum viewing angle, which cannot meet the needs of specific scenarios.

[0006] To achieve the above objectives, the first aspect of this application provides a privacy film, comprising:

[0007] Multiple light-absorbing structures are arranged between the light-incident surface and the light-exit surface of the privacy film. The multiple light-absorbing structures are spaced apart along a first direction, and each multiple light-absorbing structure includes at least one first absorption structure and at least one second absorption structure. The first absorption structure extends from the light-exit surface to the light-incident surface along a second direction, and the width of the first absorption structure gradually decreases along the second direction. The second absorption structure extends from the light-exit surface along the second direction, and a gap is formed between the end of the second absorption structure and the light-incident surface.

[0008] Multiple transmission structures are arranged between the light-incident surface and the light-exit surface, and the multiple transmission structures are located at the gaps between adjacent light-absorbing structures;

[0009] Wherein, the first direction and the second direction are perpendicularly distributed, the second direction is the direction from the light-emitting surface to the light-incident surface, and the width is the extension length along the first direction.

[0010] In one or more embodiments, the width of the second absorption structure gradually decreases along the second direction.

[0011] The plurality of transmission structures described in one or more embodiments include:

[0012] At least one first transmission structure is located between adjacent light-absorbing structures;

[0013] At least one second transmission structure is located on the side of the second absorption structure facing the light incident surface, and is integrally connected with the adjacent first transmission structure.

[0014] In one or more embodiments, the width a1 of the first absorption structure on the light-emitting surface and the width c1 of the first transmission structure on the light-emitting surface satisfy the following formula: a1:c1=(0.25~4):1.

[0015] In one or more embodiments, the width b1 of the second absorption structure on the light-emitting surface and the width c1 of the first transmission structure on the light-emitting surface satisfy the following formula: b1:c1=(0.25~4):1.

[0016] In one or more embodiments, the height h1 of the first absorption structure and the width c1 of the first transmission structure on the light-emitting surface satisfy the following formula: h1:c1=(1~5):1.

[0017] In one or more embodiments, a plurality of first absorption regions and a plurality of second absorption regions are alternately arranged along the first direction, wherein the first absorption regions include a plurality of first absorption structures and the second absorption regions include a plurality of second absorption structures.

[0018] In one or more embodiments, the sidewalls of the first absorption structure and / or the sidewalls of the second absorption structure form an angle of less than or equal to 20° with the second direction.

[0019] In one or more embodiments, the extension direction of the sidewall of the first absorption structure is parallel to the extension direction of the sidewall of the second absorption structure.

[0020] In one or more embodiments, the sidewalls of the first absorption structure and / or the second absorption structure are flat surfaces that are inclined relative to the second direction.

[0021] In one or more embodiments, the sidewalls of the first absorption structure and / or the second absorption structure include a plurality of extended surfaces arranged sequentially along a second direction, with an obtuse angle between adjacent extended surfaces, the extended surfaces being inclined or parallel to the second direction, and at least one of the extended surfaces being inclined relative to the second direction.

[0022] In one or more embodiments, the absolute value of the difference between the refractive index of the transmission structure and the refractive index of the light absorption structure is less than or equal to 0.1, the refractive index of the transmission structure is 1.4 to 1.66, and the refractive index of the light absorption structure is 1.4 to 1.66.

[0023] In one or more embodiments, the angular range of the central bright area of ​​the privacy film is negatively correlated with the height of the first absorption structure, the angular range of the central bright area of ​​the privacy film is positively correlated with the spacing between adjacent light absorption structures, the angular range of the central bright area of ​​the privacy film is positively correlated with the sidewall tilt angle of the first absorption structure and / or the second absorption structure, the brightness reduction rate of the emitted light of the privacy film is positively correlated with the height of the second absorption structure, and the brightness reduction rate is the rate of decrease in emitted light brightness as the incident angle of the incident light of the privacy film gradually increases.

[0024] To achieve the above objectives, a second aspect of this application provides a display device including a display screen and a privacy film as described in any of the above embodiments, the privacy film being disposed on the display screen.

[0025] The advantages of this application, which differ from existing technologies, are:

[0026] The light absorption structure of the privacy film of this application includes a first absorption structure and a second absorption structure. Since a gap is formed between the second absorption structure and the light-incident surface, when the viewing angle is greater than the angle range of the central high-brightness area, some light can pass through the gap. Therefore, the light brightness will not drop to zero rapidly, which can meet the needs of specific scenarios.

[0027] The privacy film of this application can control the angle range of the central high-brightness area by adjusting the width of the first transmissive structure, the height of the first absorbent structure, and the side wall tilt angle of the first absorbent structure and the second absorbent structure, so as to adapt to the usage scenarios with different window requirements.

[0028] The privacy film of this application can adjust the rate at which the brightness of the emitted light decreases by adjusting the height of the second absorption structure, thereby meeting the needs of different scenarios. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of one embodiment of the privacy film of this application;

[0031] Figure 2 This is a schematic diagram of another embodiment of the privacy film of this application;

[0032] Figure 3 This is a schematic diagram of another embodiment of the privacy film of this application;

[0033] Figure 4 This is a schematic diagram of another embodiment of the privacy film of this application;

[0034] Figure 5 This is a graph showing the correlation between the brightness of the privacy film and the viewing angle in the example of this application.

[0035] Figure 6 This is a schematic diagram of one embodiment of the display device of this application.

[0036] Explanation of key figure labels:

[0037] Privacy film 10; light-incident surface 101; light-emitting surface 102; light-absorbing structure 103; first absorption structure 103a; second absorption structure 103b; transmission structure 104; first transmission structure 104a; second transmission structure 104b; first absorption region 105; second absorption region 106.

[0038] Display screen 20. Detailed Implementation

[0039] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0040] The brightness of existing privacy screen protectors generally decreases gradually as the viewing angle increases, until the brightness drops rapidly to almost zero after the viewing angle reaches the maximum viewing angle. This cannot meet the needs of specific scenarios, such as scenarios that require high brightness within a certain angle range and low brightness beyond that range.

[0041] To address the aforementioned issues, the applicant has developed a novel privacy screen protector. By optimizing its light-blocking structure, this screen protector can gradually reduce the brightness of the emitted light after the viewing angle exceeds the maximum angle of the central bright area, thus meeting the needs of specific scenarios. Furthermore, the angle range of the central bright area can be controlled through structural adjustments, adapting to usage scenarios with different viewing requirements.

[0042] In the following descriptions of the embodiments, the width is the extension length in the first direction, and the height is the extension length in the second direction.

[0043] For details, please refer to Figure 1 , Figure 1 This is a schematic diagram of one embodiment of the privacy film of this application.

[0044] like Figure 1 As shown, the privacy film 10 includes a light-incident surface 101 and a light-emitting surface 102 arranged opposite to each other. In this embodiment, the light-incident surface 101 and the light-emitting surface 102 can be arranged substantially parallel. In other embodiments, the extension direction of the light-incident surface 101 and the light-emitting surface 102 can also be adjusted according to actual needs, and the effect of this embodiment can be achieved in all cases.

[0045] The privacy film 10 includes a plurality of light-absorbing structures 103 disposed between the light-incident surface 101 and the light-emitting surface 102, and the plurality of light-absorbing structures 103 are arranged at intervals along a first direction x.

[0046] Specifically, in order to meet the needs of specific scenarios, the light absorption structure 103 in this embodiment includes a plurality of first absorption structures 103a and a plurality of second absorption structures 103b.

[0047] The first absorption structure 103a extends from the light-emitting surface 102 along the second direction y to the light-incident surface 101, and the width of the first absorption structure 103a gradually decreases along the second direction y.

[0048] The second absorption structure 103b extends from the light-emitting surface 102 along the second direction y, and a gap is formed between the end of the second absorption structure 103b and the light-incident surface 101.

[0049] The privacy film 10 also includes a plurality of transmission structures 104, which are arranged between the light-incident surface 101 and the light-exit surface 102 and located at the gaps between adjacent light-absorbing structures 103, thereby forming an integral film structure.

[0050] Specifically, the plurality of transmission structures 104 include a first transmission structure 104a located between adjacent light absorption structures 103, and a second transmission structure 104b located on the side of the second absorption structure 103b facing the light incident surface 101, wherein the second transmission structure 104b and the adjacent first transmission structure 104a are connected as one unit.

[0051] Based on the above structure, the maximum angle of the central highlight area of ​​the privacy film 10 can be considered as... Figure 1 θ1 in the middle, at this time by Figure 1 The light ray S100 incident at the endpoint A of the first absorption structure 103a on the incident surface 101 can be emitted by the adjacent first absorption structure 103a at the endpoint B of the emitting surface 102, while the light rays incident at other positions will be absorbed by the first absorption structure 103a and the second absorption structure 103b.

[0052] As the incident angle increases further, it is understandable that the light rays incident at point A will also be absorbed by the first absorption structure 103a, such as... Figure 1 The light S101 in the light source causes a decrease in brightness.

[0053] However, because a second transmission structure 104b exists between the second absorption structure 103b and the incident surface 101, when the incident angle is greater than the maximum angle of the central bright region, some light can pass through the second transmission structure 104b and the first transmission structure 104a in sequence, such as... Figure 1 S102 in the middle. At the same time, the path of light entering the light absorption structure 103 is also reduced. Therefore, when the incident angle is greater than the maximum angle of the central bright area, the brightness will not drop to zero rapidly, which can meet the needs of specific scenarios.

[0054] In one embodiment, the transmission structure 104 and the absorption structure 103 may be made of UV resin material or other similar materials. For example, a continuous grooved structure can be achieved by a specific molding structure and a UV curing coating process, and then the grooves are filled with UV resin material or other similar materials for absorbing light and UV curing coating process is used to form the absorption structure 103.

[0055] In order to reduce the refraction angle of light at the interface between the light absorption structure 103 and the transmission structure 104, in one embodiment, the absolute value of the difference between the refractive index of the transmission structure 104 and the refractive index of the light absorption structure 103 may be less than or equal to 0.1.

[0056] In one embodiment, the refractive index of the transmission structure 104 can be 1.4 to 1.66, and the refractive index of the light absorption structure 103 can be 1.4 to 1.66.

[0057] In this embodiment, the width of the first absorption structure 103a gradually decreases along the second direction y, such that the width a2 of the first absorption structure 103a at the light-incident surface 101 is smaller than its luminous intensity a1 at the light-emitting surface 102, thereby helping to increase the viewing angle range. Correspondingly, in this embodiment, the width of the second absorption structure 103b also gradually decreases along the second direction y, thereby increasing the viewing angle range.

[0058] Specifically, the sidewall of the first absorption structure 103a forms an angle of less than or equal to 20° with the second direction y, and the sidewall of the second absorption structure 103b forms an angle of less than or equal to 20° with the second direction y.

[0059] In other embodiments, the width of the second absorption structure 103b can also be designed based on actual needs. For example, its width can remain unchanged, or it can be designed to increase along the second direction y, etc., thereby adjusting the rate of decrease in brightness of the emitted light when the angle of the incident light gradually increases within the range greater than the angle range of the central bright area, that is, the rate of decrease in brightness of the emitted light when the incident angle of the incident light of the privacy film gradually increases.

[0060] Understandably, by adjusting the angle formed between the sidewalls of the first absorption structure 103a and / or the second absorption structure 103b and the second direction y, the angle range of the central bright area can be adjusted.

[0061] In this embodiment, the extension direction of the sidewall of the first absorption structure 103a is parallel to the extension direction of the sidewall of the second absorption structure 103b; in other embodiments, the extension directions of the two can be different, which can be adjusted according to actual needs, and all can achieve the effect of this embodiment.

[0062] Based on the above-described privacy film 10 structure, the angle range of the central bright area and the rate of decrease in light brightness of the privacy film 10 are adjustable. Specifically, firstly, when the height h1 of the first absorption structure 103a changes, the angle range of the central bright area also changes accordingly, and the two are negatively correlated. That is, when the height h1 increases, the maximum angle θ1 of the central bright area decreases, and when the height h1 decreases, the angle range θ1 of the central bright area increases.

[0063] Second, when the width of the first transmission structure 104a changes, the angle range of the central bright area will also change accordingly. The two are positively correlated. That is, when the width c1 increases, the maximum angle θ1 of the central bright area increases, and when the width c1 decreases, the maximum angle θ1 of the central bright area decreases.

[0064] Third, when the height h2 of the second absorption structure 103b changes, the rate at which the brightness of the emitted light decreases with the increase of the incident light angle will also change accordingly. The two are positively correlated, that is, when the height h2 increases, the rate at which the brightness of the emitted light decreases will also increase, and when the height h2 decreases, the rate at which the brightness of the emitted light decreases will also decrease.

[0065] Fourth, when the angle between the sidewalls of the first absorption structure 103a and / or the second absorption structure 103b and the second direction y changes, the two are positively correlated. When the angle increases, the maximum angle of the central bright area increases, and when the angle decreases, the maximum angle of the central bright area decreases.

[0066] Therefore, the dimensions of each structure of the privacy film 10 can be designed based on actual needs, so as to control the angle range of the central high-brightness area and adapt to usage scenarios with different viewing requirements.

[0067] In one embodiment, the width a1 of the first absorption structure 103a on the light-emitting surface 102 and the width c1 of the first transmission structure 104a on the light-emitting surface 102 can satisfy the following formula: a1:c1=(0.25~4):1.

[0068] In one embodiment, the width b1 of the second absorption structure 103b on the light-emitting surface 102 and the width c1 of the first transmission structure 104a on the light-emitting surface 102 can satisfy the following formula: b1:c1=(0.25~4):1.

[0069] In one embodiment, the height h1 of the first absorption structure 103a and the width c1 of the first transmission structure 104a on the light-emitting surface 102 can satisfy the following formula: h1:c1=(1~5):1.

[0070] In this embodiment, the first absorption structure 103a and the second absorption structure 103b are arranged periodically. The privacy film 10 includes a plurality of first absorption regions 105 and a plurality of second absorption regions 106 arranged alternately along the first direction x. The first absorption region 105 includes three first absorption structures 103a, and the second absorption region 106 includes two absorption structures. Adjacent first absorption regions 105 and second absorption regions 106 can form a combination to ensure that the brightness of the emitted light at all locations of the privacy film 10 is uniform.

[0071] In other embodiments, the number of first absorption structures 103a in each first absorption region 105 and the number of second absorption structures 103b in each second absorption region 106 can be adjusted according to actual needs, and the effect of this embodiment can be achieved.

[0072] In the above embodiments, both the first absorption structure 103a and the second absorption structure 103b are trapezoidal structures. In other embodiments, the first absorption structure 103a and the second absorption structure 103b may also be other shapes, such as triangles. Please refer to [link to relevant documentation]. Figure 2 , Figure 2 This is a schematic diagram of another embodiment of the privacy film of this application.

[0073] like Figure 2 As shown, the width of the first absorption structure 103a on the light-incident surface 101 is 0, and the width of the second absorption structure 103b at the end near the light-incident surface 101 can also be 0, which helps to further improve the viewing angle range.

[0074] In the above embodiments, the sidewalls of the first absorption structure 103a and the second absorption structure 103b are both flat surfaces. In other embodiments, the sidewalls of the first absorption structure 103a and the second absorption structure 103b may also include multiple extended surfaces that form an angle with each other, which can also achieve the effect of this embodiment.

[0075] For example, please refer to Figure 3 , Figure 3 This is a schematic diagram of another embodiment of the privacy film of this application. Figure 3 As shown, the sidewall of the first absorption structure 103a may include two extended surfaces 1031 arranged sequentially along the second direction y. Both extended surfaces 1031 are inclined to the second direction y, so that the overall width of the first absorption structure 103a gradually decreases along the second direction y.

[0076] exist Figure 3 In one embodiment, the slope of the two extended surfaces 1031 arranged sequentially in the second direction y gradually increases; in other embodiments, the slope of the two extended surfaces 1031 arranged sequentially in the second direction y may gradually decrease, such as... Figure 4 As shown, Figure 4 This is a schematic diagram of another embodiment of the privacy film of this application.

[0077] In particular, in other embodiments, the extended surface 1031 may be partially arranged parallel to the second direction y, or the sidewalls of the first absorption structure 103a and the second absorption structure 103b may include other numbers of extended surfaces 1031, such as 3 or 4, all of which can achieve the effect of this embodiment.

[0078] The beneficial effects of the privacy film of this application will be further explained in detail below with reference to specific embodiments.

[0079] Example 1:

[0080] A privacy screen protector, structured as follows Figure 1As shown, each first absorption region includes three first absorption structures, and each second absorption region includes two second absorption structures; the ratio of the height h1 of the first absorption structure to the height h2 of the second absorption structure is h1:h2 = 1.8; the ratio of the height h1 of the first absorption structure to the width c1 of the first transmission structure on the light-emitting surface is h1:c1 = 2.7; the ratio of the width a1 of the first absorption structure on the light-emitting surface to the width c1 of the first transmission structure on the light-emitting surface is a1:c1 = 0.45; the width a1 of the first absorption structure on the light-emitting surface and the width b1 of the second absorption structure on the light-emitting surface are equal.

[0081] Example of effect:

[0082] Brightness tests were conducted on the privacy film of Example 1 at different viewing angles, and a conventional privacy film was used as a comparative example. Figure 5 , Figure 5 This is a graph showing the correlation between the brightness of the privacy film and the viewing angle in the example of this application.

[0083] like Figure 5 As shown, conventional privacy films reach maximum brightness at the center angle, and then the brightness decreases rapidly as the viewing angle increases, reaching almost zero at an angle of approximately ±40°. In contrast, the privacy film of Example 1 has a bright area within a range of approximately 6 degrees to the left and right of the center angle, then the brightness decreases to approximately ±45 degrees, exhibiting an inflection point at this angle. Outside this inflection point, the brightness decreases at a slower rate.

[0084] As can be seen from the above data, the privacy film of this application has a larger viewing angle window than conventional privacy films, and when the viewing angle continues to increase after reaching the central high-brightness area, the brightness can decrease at a slower rate, which can meet the needs of specific scenarios.

[0085] This application also provides a display device, please refer to... Figure 6 , Figure 6 This is a schematic diagram of one embodiment of the display device of this application. The display device includes a display screen 20 and a privacy film 10 of any of the above embodiments. The privacy film 10 is attached to the display screen 20. It can be understood that by arranging the privacy film 10 of any of the above embodiments, the brightness control of the display screen 20 under different viewing angles can be realized, thereby meeting different specific needs.

[0086] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0087] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A privacy film, characterized by, The application relates to a privacy film, comprising: a plurality of light-absorbing structures arranged between an incident light surface and an emergent light surface of the privacy film, the plurality of light-absorbing structures being arranged at intervals along a first direction, and the plurality of light-absorbing structures comprising at least one first light-absorbing structure and at least one second light-absorbing structure, the first light-absorbing structure extending from the emergent light surface to the incident light surface along a second direction, the width of the first light-absorbing structure gradually decreasing along the second direction, and the second light-absorbing structure extending from the emergent light surface along the second direction, and a gap being formed between the end of the second light-absorbing structure and the incident light surface; a plurality of transmission structures arranged between the incident light surface and the emergent light surface, the plurality of transmission structures being located at the gaps between adjacent light-absorbing structures; wherein the first direction and the second direction are perpendicular, the second direction being the direction in which the emergent light surface is directed towards the incident light surface, and the width being the length of extension along the first direction.

2. The privacy film of claim 1, wherein, The width of the second light-absorbing structure gradually decreases along the second direction.

3. The privacy film of claim 1, wherein, The plurality of transmission structures comprises: at least one first transmission structure located between adjacent light-absorbing structures; at least one second transmission structure located on the side of the second light-absorbing structure facing the incident light surface and being integrated with adjacent first transmission structures.

4. The privacy film of claim 3, wherein, The width a1 of the first light-absorbing structure on the emergent light surface and the width c1 of the first transmission structure on the emergent light surface satisfy the following formula: a1:c1=(0.25-4):1; and / or, The width b1 of the second light-absorbing structure on the emergent light surface and the width c1 of the first transmission structure on the emergent light surface satisfy the following formula: b1:c1=(0.25-4):1; and / or, The height h1 of the first light-absorbing structure and the width c1 of the first transmission structure on the emergent light surface satisfy the following formula: h1:c1=(1-5):

1.

5. The privacy film of claim 1, wherein, The first light-absorbing structure and the second light-absorbing structure are arranged alternately along the first direction.

6. The privacy film of claim 1, wherein, The side wall of the first light-absorbing structure and / or the side wall of the second light-absorbing structure forms an included angle of less than or equal to 20 degrees with the second direction; and / or, The extension direction of the side wall of the first light-absorbing structure is parallel to the extension direction of the side wall of the second light-absorbing structure.

7. The privacy film of claim 1, wherein, The side wall of the first light-absorbing structure and / or the side wall of the second light-absorbing structure is a flat surface arranged obliquely relative to the second direction; or, The side wall of the first light-absorbing structure and / or the side wall of the second light-absorbing structure comprises a plurality of extension surfaces arranged sequentially along the second direction, an obtuse angle being formed between adjacent extension surfaces, the extension surfaces being arranged obliquely or parallel relative to the second direction, and at least one of the extension surfaces being arranged obliquely relative to the second direction.

8. The privacy film of claim 1, wherein, The absolute value of the difference between the refractive index of the transmission structure and the refractive index of the light-absorbing structure is less than or equal to 0.1, the refractive index of the transmission structure being 1.4-1.66, and the refractive index of the light-absorbing structure being 1.4-1.

66.

9. The privacy film of claim 1, wherein, The angle range of the central highlight area of the privacy film is negatively correlated with the height of the first absorption structure, the angle range of the central highlight area of the privacy film is positively correlated with the interval between adjacent light absorption structures, the angle range of the central highlight area of the privacy film is positively correlated with the side wall inclination angle of the first absorption structure and / or the second absorption structure, the brightness reduction rate of the outgoing light of the privacy film is positively correlated with the height of the second absorption structure, and the brightness reduction rate is the reduction rate of the brightness of the outgoing light when the incident angle of the incident light of the privacy film gradually increases.

10. A display device, characterized by comprising: A display screen comprising a display screen and the privacy film according to any one of claims 1 to 9, wherein the privacy film is arranged on the display screen.

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