Film and peep-proof structural member

Abstract

The utility model discloses a film and a peep-proof structural member, the film comprises a substrate layer and an emulsion layer, the substrate layer has a first surface and a second surface opposite to each other in a first direction, the emulsion layer is arranged on the first surface and / or the second surface, a plurality of gratings are formed in the emulsion layer, the gratings extend along the first direction, and the first surface and the second surface are opposite to each other. The first and second electrodes are oppositely arranged at intervals in the second direction so as to block light in the second direction, and an included angle is formed between the first direction and the second direction. According to the film provided by the embodiment of the invention, the optical gratings are formed on the emulsion layer in an exposure and development manner, so that a peep-proof function is realized based on the optical gratings in the film, the film is applied to various display devices to form a peep-proof structural member, and the light transmittance of the film is relatively high and almost no impurity exists between the optical gratings; therefore, the light transmittance of the light in the front view range is high, and when a user watches a screen with a film from the front view direction, better user experience can be obtained.

Description

Technical Field

[0001] This application belongs to the field of film technology, and in particular relates to a film and a privacy screen component. Background Technology

[0002] In existing technologies, when users browse information on the screens of electronic products such as computers and mobile phones, the wide viewing angles of the screens make it easy for others to access the information. To avoid this, a privacy layer is needed in the display area. Existing privacy layers block or absorb light from non-viewing directions to achieve a privacy effect. However, while blocking light from non-viewing directions, privacy layers inevitably block some light from the viewing direction. This results in insufficient brightness when users view the display area with the privacy layer from the viewing direction, affecting the user experience. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of this application is to provide a film and a privacy structure incorporating the film, wherein the film has good light transmittance in any first direction and can achieve a privacy function, allowing users to obtain a better user experience when viewing from the front.

[0004] In a first aspect, the film according to the embodiments of this application includes a substrate layer and an emulsion layer, wherein the substrate layer has a first surface and a second surface opposite to each other in a first direction, the emulsion layer is disposed on the first surface and / or the second surface, a plurality of gratings are formed in the emulsion layer, the gratings extend along the first direction and are disposed opposite to each other and spaced apart in the second direction to block light in the second direction, and the first direction and the second direction have an angle.

[0005] According to the embodiments of this application, a grating is formed on the emulsion layer by exposure and development, so as to realize the privacy function based on the grating in the film, thereby applying the film to various display devices. Since the film itself has high light transmittance and there are almost no impurities between each grating, the light transmittance in the viewing range is high. When the user views the screen with the film from the frontal direction, they can get a better user experience.

[0006] According to a further embodiment of this application, the film further includes a first partition layer located on a first surface and / or a second surface and located on the outermost side of the film along its thickness direction.

[0007] In some embodiments, the film further includes a second partition, and the emulsion layers are at least two layers, with the second partition disposed between two adjacent emulsion layers, wherein the projections of the gratings within the plurality of emulsion layers coincide in a first direction.

[0008] Furthermore, the thickness of the second separator is ≤5µm, and the thickness W1 of the emulsion layer and the thickness W2 of the second separator satisfy: 0.1≤W1 / W2≤0.5.

[0009] Furthermore, the first and second partitions are made of the same material.

[0010] According to a further embodiment of this application, the film further includes an anti-halo layer, wherein the anti-halo layer and the emulsion layer are respectively disposed on both sides of the substrate layer, or the anti-halo layer and the emulsion layer are disposed on the same side of the substrate layer, and the anti-halo layer is located between the substrate layer and the emulsion layer.

[0011] In some embodiments, the total thickness of the first separator, the second separator, the emulsion layer, and the anti-halo layer is 6µm-60µm.

[0012] According to a further embodiment of this application, the emulsion layer contains emulsion particles with a particle size of less than 1 μm.

[0013] Secondly, the privacy structure according to the embodiments of this application includes a film and a functional layer from any of the foregoing embodiments, wherein the functional layer is stacked with the film and the functional layer is configured as a hardened layer so that the privacy structure is configured as a privacy display film, or the functional layer is configured as a conductive layer so that the privacy structure is configured as a privacy display screen.

[0014] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0016] Figure 1 This is a cross-sectional view of a portion of the structure of a film having an emulsion layer according to an embodiment of this application;

[0017] Figure 2 This is a microscopic view of a film taken from a top-down angle, according to an example of an embodiment of this application.

[0018] Figure 3 It is a film structure with two emulsion layers according to an embodiment of this application;

[0019] Figure 4 This is another film structure having an emulsion layer according to an embodiment of this application;

[0020] Figure 5 This is a microscopic view of a film taken from a top-down angle, according to another example of an embodiment of this application.

[0021] Figure 6 This is a simplified structural diagram of a film with two emulsion layers according to an embodiment of this application;

[0022] Figure 7 This is a simplified structural diagram of a film with four emulsion layers according to an embodiment of this application.

[0023] Figure label:

[0024] 100 - Substrate layer, 110 - First surface, 120 - Second surface;

[0025] 210-Emulsion layer, 211-Raster, 212-Transmitting portion, 210a-First emulsion layer, 210b-Second emulsion layer;

[0026] 220 - First partition layer, 230 - Second partition layer, 240 - Anti-halo layer;

[0027] a - first grating a, b - second grating b, c - third grating c, f - fourth grating f, e - fifth grating e. Detailed Implementation

[0028] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0029] First, some terms that need to be mentioned in this application will be explained:

[0030] Direction of view: This refers to the direction in which the user is looking directly at the screen (such as a computer monitor or mobile phone screen). Therefore, the direction of view does not specifically refer to a direction that is completely perpendicular to the screen, but rather a range of angles that conforms to the user's viewing habits.

[0031] Privacy layer: The privacy layer is a special functional layer used to prevent screen information from being viewed from the side. It uses physical optical principles to change the wide viewing angle of the screen into a narrow viewing angle, thereby narrowing the visible range of the screen to achieve the privacy function.

[0032] Anti-halo layer: refers to the anti-halo layer in film. It is a layer of colloid in film, mainly used to prevent strong light from being reflected back from the film substrate layer and exposing the emulsion layer again, thus causing image fogging.

[0033] Black and white development transmission optical density: Black and white development transmission optical density, usually simply referred to as optical density, is a physical quantity used to describe the degree to which photographic film becomes dark after exposure and development.

[0034] Emulsion particles: mainly composed of silver halide crystals, used to generate images and produce irregular silver salt particles.

[0035] Next, the film and privacy screen structure according to embodiments of this application will be described.

[0036] Combination Figure 1-7 The film according to embodiments of this application includes a substrate layer 100 and an emulsion layer 210. The substrate layer 100 has a first surface 110 and a second surface 120 opposite to each other in a first direction. The emulsion layer 210 is disposed on the first surface 110, or on the second surface 110, or on both the first surface 110 and the second surface 120. A plurality of gratings 211 are formed within the emulsion layer 210. The gratings 211 extend along the first direction and are disposed opposite to each other and spaced apart in a second direction to block light in the second direction. The first direction and the second direction form an angle.

[0037] It should be noted that the first direction can be the thickness direction of the substrate layer 100, and the first surface 110 and the second surface 120 are the two surfaces of the substrate layer 100 on both sides of its thickness. The grating 211 extending along the first direction can achieve light blocking in a second direction that is at an angle to the first direction. For example, if the film is placed horizontally, the first direction is the vertical direction. The light emitted along the first direction and the light emitted between adjacent gratings 211 that are not blocked by the gratings 211 are visible light, located within the user's viewing area and visible to the user. However, the light emitted along the second direction that is at an angle to the first direction will be blocked by the grating, thereby achieving a privacy effect of being invisible in the second direction.

[0038] In other words, the line of sight is defined as being directly facing the film and within a certain angle range on both sides of the film. Lines of sight outside this angle range will be blocked by the grating, thus achieving privacy protection.

[0039] In some cases, the grating 211 can be formed in the emulsion layer 210 by exposure and development.

[0040] The emulsion layer 210 is filled with emulsion particles. A laser can be used to expose the film to develop a grating 211 within the emulsion layer 210. By controlling the laser, the emulsion layer 210 is exposed along a first direction to form a grating 211 extending along that direction. Of course, the viewing area and transmittance of the grating 211 can be changed by adjusting the laser.

[0041] Specifically, the substrate layer 100 is made of a transparent material, and the emulsion layer 210 is laser-exposed and developed to form gratings 211, creating parallel gratings 211. This allows light passing through the substrate layer 100 to selectively pass through the emulsion layer 210, achieving a privacy protection effect. Compared to a privacy layer formed by filling a light-blocking material into a light-transmitting layer, the film itself has better light transmittance, making it easier for light emanating from the first direction to pass through.

[0042] Furthermore, compared to privacy layers formed by filling with light-blocking materials, which contain more impurities, the film of this application has virtually no impurities between two adjacent gratings 211. Therefore, when the film is used for privacy, the light radiating along the viewing range will not be obstructed by impurities, thus making it easier to pass through the film along the viewing range.

[0043] Furthermore, since the grating 211 is formed by laser exposure and development, the grating 211 is smaller in width. The smaller the width of the grating 211 arranged in the emulsion layer 210, the higher the porosity (i.e. the number of transparent portions between two gratings 211) in the emulsion layer 210 within a limited area, so as to allow more light to pass through in the viewing range.

[0044] It should be noted that the comparison with existing privacy layers formed by filling light-blocking materials mentioned in the foregoing embodiments is not intended to limit this application to improvements thereof, but is merely for the purpose of explaining the principle.

[0045] To better understand, combine Figure 1-Figure 3 The examples will be explained in detail.

[0046] For example, in combination Figure 1-Figure 2 To understand, such as Figure 1 As shown, an emulsion layer 210 is formed on the substrate layer 100, and gratings 211 extend along a direction perpendicular to the thickness of the substrate layer 100. In the viewing direction, the gratings 211 are spaced apart along this direction, with a light-transmitting portion 212 between each adjacent grating. When a user views the screen from the front, light passes through in the first direction (perpendicular to the thickness of the substrate layer 100) and then diffuses further from the light-transmitting area between the two adjacent gratings 211, allowing the user to obtain screen information when viewing the screen from the front. Simultaneously, the gratings 211 block light from diffusing in a second direction, thus reducing the viewing angle and achieving a privacy function.

[0047] Continue to refer Figure 2 As shown, the width of the grating 211 in this example does not exceed 8μm. A smaller grating 211 width can result in a higher porosity within the emulsion layer 210, thereby increasing light transmittance. The specific reasons will not be repeated here.

[0048] Similarly, in other examples, combining Figure 3 It is understood that the emulsion layer 210 consists of two layers, specifically including a first emulsion layer 210a and a second emulsion layer 210b stacked together. Light can be diffused within the field of view, and the specific principle is basically the same as the previous example, so it will not be described in detail here.

[0049] According to the embodiments of this application, a grating 211 is formed on the emulsion layer 210 by exposure and development, so as to realize the privacy function based on the grating 211 in the film, thereby applying the film to various display devices. Since the film itself has high light transmittance and there are almost no impurities between each grating 211, the light transmittance in the viewing range is high. When the user views the screen covered with the film from the viewing direction, a better user experience can be obtained.

[0050] Furthermore, when using film for privacy purposes, the grating 211 can be directly formed by laser development of the emulsion layer 210, reducing the number of preparation steps and lowering costs.

[0051] According to a further embodiment of this application, the film also includes a first partition 220, which is preferably made of a transparent material, and the first partition 220 can be disposed in various positions.

[0052] For example, the first separator 220 is located on the first surface 110 and is located on the outermost side. Specifically, the emulsion layer 210 is constructed on the first surface 110 and the first separator 220 is also stacked on the side of the emulsion layer 210 away from the substrate layer 100. The first separator 220 is disposed on the outermost layer along the thickness direction of the film.

[0053] For example, the first separator 220 is located on the second surface 120 and is located on the outermost side. Specifically, the emulsion layer 210 is constructed on the second surface 120 and the first separator 220 is also stacked on the side of the emulsion layer 210 away from the substrate layer 100. The first separator 220 is disposed on the outermost layer along the thickness direction of the film.

[0054] For example, the first separator 220 is located on one side of the first surface 110 and the second surface 120, and is located on the outermost side. Specifically, the emulsion layer 210 is constructed on the first surface 110 and the second surface 120, and the first separator 220 is stacked on the side away from the substrate layer 100 of both the emulsion layer 210 on the first surface 110 and the emulsion layer 210 on the second surface 120. In other words, the first separator 220 is disposed on the outermost layer of the film along the thickness direction of the film.

[0055] Of course, the first partition 220 can be a coating structure applied to the emulsion layer 210, or it can be set on the emulsion layer 210 by means of pressing or other methods. In general, the first partition 220 is formed on the outermost side of the film along the thickness direction, and can protect the film and mainly the emulsion layer 210.

[0056] In some preferred examples, the thickness of the first interlayer 220 does not exceed 1 μm.

[0057] Understandably, the first partition layer 220 is on the outermost side of the film and is suitable to cover the emulsion layer 210 to form a protective effect on the emulsion layer 210 and the film. The first partition layer 220 can be made of transparent material to ensure that after light is diffused from the emulsion layer 210 to the first partition layer, the first partition layer 220 will not block the light, thereby ensuring that the film with the first partition layer 220 has good light transmittance.

[0058] In some embodiments, the film further includes a second separator 230, and the emulsion layers 210 are at least two layers, with the second separator 230 disposed between two adjacent emulsion layers 210. Specifically, the second separator 230 is disposed between two adjacent emulsion layers 210. When the second separator 230 is a coating, it is applied to the emulsion layer 210 closest to the substrate layer 100. Alternatively, the second separator 230 may be laminated between two adjacent separators. The second separator 230 is preferably a transparent material; therefore, it is suitable for separating two adjacent emulsion layers 210, and when the second separator 230 is transparent, light can pass through it.

[0059] Furthermore, in this embodiment, the projections of the gratings 211 in each emulsion layer 210 and the gratings 211 in the remaining emulsion layers 210 in at least one first direction coincide. In other words, the gratings 211 in each emulsion layer 210 and the gratings 211 in the remaining emulsion layers 210 are not misaligned along the second direction or in a direction perpendicular to the first direction (e.g., misaligned along a direction perpendicular to the film thickness), so as to avoid the situation where light is blocked by the misaligned gratings 211 when passing through the multilayer emulsion layer 210 structure due to the misalignment of the gratings 211.

[0060] Specifically, to construct multiple emulsion layers 210 in the film, an emulsion layer 210 can first be coated on the substrate layer 100, then a second separator layer 230 can be coated on the emulsion layer 210, and then another emulsion layer 210 can be coated on the second separator layer 230, so as to separate and form a structure of multiple emulsion layers 210 in the film through the second separator layer 230. Since the multiple emulsion layers 210 form a stacked structure, when the film is used for privacy protection, the light emitted from inside the screen along the second direction can be blocked multiple times by the stacked emulsion layers 210, thereby improving the privacy protection effect.

[0061] It is worth mentioning that after the emulsion layer 210 is constructed into a multi-layer structure, the film is developed by laser along the first direction to adapt to the formation of gratings 211 in the interlayer emulsion layer 210. Since the gratings 211 in each emulsion layer 210 are formed by a single exposure, the structure described in this application in which the projection of the gratings 211 in each emulsion layer 210 and the gratings 211 in the remaining emulsion layers 210 in the first direction almost completely overlaps can be formed.

[0062] For example, such as Figure 3 As shown, the emulsion layer 210 consists of two layers, and a second partition layer 230 is formed between the two emulsion layers 210. The laser forms a grating 211 in the emulsion layer 210 along the direction perpendicular to the film thickness (that is, the thickness direction of the emulsion layer 210). A light-transmitting portion 212 is defined between two adjacent gratings 211. The gratings 211 in the two emulsion layers 210 are completely aligned along their own extension direction (that is, the corresponding first direction).

[0063] Compared to Figure 1 The single-layer structure shown has a longer distance for the grating 211 along the first direction, thus providing a better light-blocking effect. Furthermore, the projections of the gratings 211 within the two emulsion layers 210 along the direction perpendicular to the film thickness completely overlap, without any additional blocking of light within the viewing range due to misalignment of the two gratings 211.

[0064] Understandably, in this example, the two emulsion layers 210 can improve the blocking effect of light from the second direction while maintaining good light transmittance of the privacy structure formed by the film in the field of view. Thus, it has both good privacy effect and good light transmittance in the field of view, thereby effectively improving the user experience.

[0065] Furthermore, the thickness of the second separator 230 is ≤5µm, and the thickness W1 of the emulsion layer 210 and the thickness W2 of the second separator 230 satisfy: 0.1≤W1 / W2≤0.5.

[0066] In some examples, the thickness of the second partition 230 is 5 μm, in some examples it is 2 μm, and in some examples it is 3 μm.

[0067] Correspondingly, in some examples, W1 / W2 = 0.1, for example, the thickness of the first separator 220 is 5 μm and the thickness of the emulsion layer 210 is 50 μm; in other examples, W1 / W2 = 0.2, for example, the thickness of the second separator 230 is 2 μm and the thickness of the emulsion layer 210 is 10 μm; in still other examples, W1 / W2 = 0.5, for example, the thickness of the second separator 230 is 5 μm and the thickness of the emulsion layer 210 is 10 μm.

[0068] Understandably, by constructing the thickness of the second partition 230 to be less than 5 μm, it is possible to prevent light from scattering from the second partition 230 in the second direction due to the second partition 230 being too thick, which would cause the film to lose or reduce its privacy protection effect.

[0069] In some examples, the first separator 220 and the second separator 230 are both constructed as coatings, and the film includes a substrate layer 100 and at least two emulsion layers 210 coated on the surface of the transparent substrate, as well as at least one first separator 220 and one second separator 230, and an anti-halo layer 240, and its total thickness is 6um-60um.

[0070] In some preferred examples, it is necessary to ensure that the black and white development transmission optical density is greater than or equal to 1.5.

[0071] For example, before use, the total thickness of the emulsion coating is 10 μm. After development, the black-and-white development transmission optical density of the film in this preferred example is used as a detection method. If the black-and-white development transmission optical density is greater than 1.5, the detection condition is met.

[0072] In some examples, the first separator 220 and the second separator 230 are made of the same material, for example, both are formed by a mixture of gelatin, surfactant, and hardening agent. Both the first separator 220 and the second separator 230 can be made of a less expensive transparent material to reduce manufacturing costs.

[0073] Next, combine Figure 1-Figure 3 And further combine Figures 4-7 The structure of the film will be further explained.

[0074] According to a further embodiment of this application, the film also includes an anti-halo layer 240, and in some cases, the anti-halo layer 240 and the emulsion layer 210 are respectively disposed on opposite sides of the substrate layer 100, and in other cases, the anti-halo layer 240 and the emulsion layer 210 are disposed on the same side of the substrate layer 100, and the anti-halo layer 240 is located between the substrate layer 100 and the emulsion layer 210.

[0075] For example, the anti-halo layer 240 and the emulsion layer 210 are respectively disposed on both sides of the substrate layer 100, as shown in the reference. Figure 4 and combined Figure 2 To understand, the film includes an anti-halo layer 240 constructed on a first surface 110 of a substrate and an emulsion layer 210 constructed on a second surface 120, wherein a first separator 220 is constructed on the side of the emulsion layer 210 away from the substrate layer 100.

[0076] Specifically, emulsion layer 210 uses 1300 grams of a red-sensitive emulsion with particles of 0.2-0.3 μm, added to 1360 grams of a 6.3% gelatin solution at 40 degrees Celsius, along with appropriate surfactants and film-hardening agents to form emulsion layer 210. Furthermore, emulsion layer 210 meets the requirement that, when the wet coating weight is 67 g / m², its maximum density after development is greater than or equal to 1.5.

[0077] Anti-halo layer 240 is formed by adding 86 grams of 30 g / L 385 red blocking dye (a dyeing agent) to 395 grams of 7.7% gelatin solution at 40 degrees Celsius, and adding appropriate surfactants and hardening agents.

[0078] The first separator 220 is formed by dissolving 13 grams of gelatin in 425 grams of water and adding appropriate surfactants and hardening agents.

[0079] The substrate layer 100 uses a 50µm PET substrate.

[0080] In preparing the film in this example, an initial film without the grating 211 is first prepared. This is achieved by coating the anti-halo layer 240, emulsion layer 210, and first separator layer 220 once using a multilayer coating machine with appropriate coating amounts. After drying, the initial film is obtained. The thicknesses of each coating after drying are 0.5 μm for the anti-halo layer 240, 30 μm for the emulsion layer 210, and 0.5 μm for the first separator layer 220. Then, the grating 211 is formed using a 650 nm wavelength laser exposure. After development, a film with anti-spy protection is obtained. The formed grating 211 is as follows: Figure 2 As shown.

[0081] The width of grating 211 does not exceed 8 μm, and the grating spacing (i.e., the distance between gratings 211) does not exceed 17 μm. Figure 2 The gratings 211 that can be observed in the figure are explained. For example, the widths of the first grating a, the second grating b, and the third grating c in the figure are 7.641um, 5.624um, and 6.489um, respectively. For example, the distance between the first grating a and the second grating b is 15.725um.

[0082] For another example, please refer to... Figure 4 and combined Figure 5Understanding its structure, the film structure in this example is basically the same as the previous example. The difference is that the substrate layer 100 uses a 100um PET substrate.

[0083] The grating 211 formed in this example is as follows: Figure 5 As shown. The width of grating 211 does not exceed 11 μm, and the spacing between gratings 211 does not exceed 18 μm. Figure 5 The distances between the observable gratings 211 are explained. For example, the widths of the fifth grating e and the fourth grating f in the figure are 8.347 μm and 10.683 μm, respectively. The distance between gratings 211 is 17.815 μm, or 15.460 μm.

[0084] For example, in combination Figure 6 As shown, the anti-halo layer 240 and the emulsion layer 210 are disposed on the same side of the substrate layer 100, and the anti-halo layer 240 is located between the substrate layer 100 and the emulsion layer 210. (Refer to...) Figure 5 To understand this, the film includes an anti-halo layer 240 formed on the second surface 120 of the substrate, and two emulsion layers 210 are coated on the side of the anti-halo layer 240 away from the substrate layer 100. A second partition layer 230 is disposed between the two emulsion layers 210, and a first partition layer 220 is coated on the outer side of the outermost emulsion layer 210 in the thickness direction of the film.

[0085] Specifically, emulsion layer 210 uses 1300 grams of silver chloride emulsion with particles of 0.1-0.3 μm, which is added to 1360 grams of a 6.3% gelatin solution at 40 degrees Celsius, along with appropriate surfactants and hardening agents to form emulsion layer 210. The properties of emulsion layer 210 are such that, when the wet coating amount is 67 g / m², its maximum density after development is greater than 1.5.

[0086] When preparing the anti-halo layer 240, 86 grams of 30 g / L acid yellow blue resist dye (a type of dye) are added to 395 grams of 7.7% gelatin solution at 40 degrees Celsius, and appropriate surfactants and hardening agents are added to form the anti-halo layer 240.

[0087] The substrate layer 100 uses a 30µm PET substrate.

[0088] The second separator 230 is formed by dissolving 50 grams of gelatin in 500 grams of water and adding appropriate surfactants and film-hardening agents.

[0089] The first separator 220 is formed by dissolving 13 grams of gelatin in 425 grams of water and adding appropriate surfactants and hardening agents.

[0090] Furthermore, an initial film without the grating 211 is first prepared. Then, the anti-halo layer 240, emulsion layer 210, second separator layer 230, emulsion layer 210, and first separator layer 220 are coated once using a multilayer coating machine with appropriate coating amounts. After drying, the initial film is obtained, with the following thicknesses after drying: anti-halo layer 240 0.5 μm, emulsion layer 210 14 μm, separator layer 1.4 μm, emulsion layer 210 14 μm, and protective film 0.5 μm. Then, the grating 211 is formed by exposure using a 450 nm wavelength laser, and the resulting film, after development, has a privacy-protecting function.

[0091] In another example, the structure of the film can be referenced. Figure 7 As shown, the film includes an anti-halo layer 240 constructed on the first surface 110 of the substrate, four emulsion layers 210 coated on the second surface 120, and a second interlayer 230 is coated between every two adjacent emulsion layers 210, so there are three second interlayers 230 in total. A first interlayer 220 is coated on the outermost emulsion layer 210 in the thickness direction of the film.

[0092] The materials and preparation methods used for the emulsion layer 210, anti-halo layer 240, first separator 220, and second separator 230 in this example are the same as in the previous example. The difference is that this example uses a 100um PET substrate, and the final separator thicknesses are 0.5um for the anti-halo layer 240, 7um for the emulsion layer 210, 0.7um for the second separator 230, and 0.5um for the first separator 220.

[0093] The emulsion layer 210 in the foregoing embodiments contains emulsion particles, and the particle size of the emulsion particles is less than 1 μm. In some preferred embodiments, emulsion particles with a particle size of less than 0.5 μm are selected, and in some more preferred embodiments, emulsion particles with a particle size of less than 0.3 μm are selected.

[0094] Understandably, controlling the particle size of emulsion particles to below 1µm or even 0.3µm can reduce the number of opaque particles in the light-transmitting areas of the initial film after development, thereby improving light transmission. With technological advancements, reducing the particle size of emulsion particles to a sufficient degree can almost completely eliminate the generation of opaque particles in the light-transmitting areas.

[0095] The privacy screen structure according to the embodiments of this application includes the film and functional layer described in any of the foregoing embodiments.

[0096] In some embodiments, the functional layer is stacked with the film, and the functional layer is configured as a hardened layer so that the privacy screen component is configured as a privacy display film. The hardened layer can be any hardening material such as UVE hardening resin, and can also be constructed on the film layer by any method such as lamination or coating. Furthermore, the formed privacy display film can be a flexible film or a rigid film.

[0097] For example, a privacy screen protector can be attached to an electronic device. If the electronic device has a display screen, the privacy screen protector can be attached to the display screen, which can be an LCD screen, an OLED screen, or the like. When a user accesses information through the display screen, the privacy screen protector ensures that the screen information is visible from the front but not from the sides, preventing others from seeing the screen information and thus protecting the user's privacy.

[0098] Electronic devices can be, for example, mobile phones, computers, etc.

[0099] In some embodiments, the functional layer can be configured as a conductive layer to configure the privacy screen structure. The conductive layer can be prepared from any conductive polymer material, such as polythiophene. The conductive layer is then stacked with a film to form at least a portion of the privacy screen structure.

[0100] For example, a privacy screen formed by connecting a conductive layer to a liquid crystal display (LCD) should not be limited to a direct connection; it can be separated by other components. Another example is that the privacy screen can be constructed as a smart whiteboard in a smart car (i.e., a display screen in the car), allowing the smart whiteboard to have a narrow viewing angle to avoid side views from the smart whiteboard in the passenger seat or other areas affecting the driver.

[0101] Of course, replacing the functional layer of this application with other components suitable for being stacked on the film to obtain other structural components should be considered as something that a person skilled in the art could conceive of without creative effort, and thus also falls within the protection scope of this application.

[0102] Understandably, the film and functional layer can be directly constructed as a privacy screen or privacy display film, rather than separately bonding the privacy layer to, for example, a regular mobile phone screen protector or display screen. This reduces the number of steps in manufacturing the structural components and the amount of material used, thereby reducing costs.

[0103] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0104] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0105] In the description of this application, "multiple" means two or more.

[0106] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0107] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0108] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0109] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A type of film, characterized in that, include: A substrate layer (100) having a first surface (110) and a second surface (120) opposite each other in a first direction; An emulsion layer (210) is disposed on the first surface (110) and / or the second surface (120). A plurality of gratings (211) are formed in the emulsion layer (210). The gratings (211) extend along a first direction and are arranged opposite to each other and spaced apart in a second direction to block light in the second direction. The first direction and the second direction have an angle.

2. The film according to claim 1, characterized in that, The film further includes: a first partition (220) located on the first surface (110) and / or the second surface (120) located on the outermost side of the film along its thickness direction.

3. The film according to claim 2, characterized in that, The film further includes a second separator (230), wherein the emulsion layer (210) comprises at least two layers, and the second separator (230) is disposed between two adjacent emulsion layers (210), wherein... The projections of the gratings (211) within the plurality of emulsion layers (210) in the first direction coincide.

4. The film according to claim 3, characterized in that, The thickness of the second separator (230) is ≤5µm, and the thickness W1 of the emulsion layer (210) and the thickness W2 of the second separator (230) satisfy: 0.1≤W1 / W2≤0.

5.

5. The film according to claim 3, characterized in that, The first partition (220) and the second partition (230) are made of the same material.

6. The film according to claim 1, characterized in that, The film also includes an anti-halo layer (240), which is disposed on both sides of the substrate layer (100) and the emulsion layer (210), or disposed on the same side of the substrate layer (100) and the emulsion layer (210), and the anti-halo layer (240) is located between the substrate layer (100) and the emulsion layer (210).

7. The film according to claim 3, characterized in that, The total thickness of the first separator (220), the second separator (230), the emulsion layer (210), and the anti-halo layer (240) disposed on the substrate layer (100) is 6um-60um.

8. The film according to claim 7, characterized in that, The total thickness is 10 μm.

9. The film according to any one of claims 1-8, characterized in that, The emulsion layer (210) contains emulsion particles with a particle size of less than 1 μm.

10. A privacy screen component, characterized in that, The device includes the film and functional layer as described in any one of claims 1-9, wherein the functional layer is stacked on the film and the functional layer is configured as a hardening layer so that the privacy structure is configured as a privacy display film, or the functional layer is configured as a conductive layer so that the privacy structure is configured as a privacy display screen.

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