A privacy film and display

Abstract

The application discloses a kind of anti-peep film and display screen, for in realizing anti-peep function while improving the display brightness and display uniformity of display screen.The anti-peep film of the application embodiment includes: film layer body, the film layer body has opposite first surface and second surface;The film layer body includes a plurality of light-transmitting regions and a plurality of light-blocking regions, the light-transmitting regions and the light-blocking regions are alternately arranged, the light-transmitting regions extend along the first direction, the first direction has a first included angle with the thickness direction of the film layer body;The opening width of the light-transmitting region on the first surface is greater than the opening width of the light-transmitting region on the second surface, so that the viewing angle range of the anti-peep film in the first direction is asymmetric.

Description

Technical Field

[0001] This invention relates to the field of display screen component technology, and more specifically to a privacy film and a display screen. Background Technology

[0002] With the development of display technology, the application scenarios of displays are becoming increasingly widespread, and users' demand for privacy protection of displays is also increasing. Privacy films, as a display accessory that can limit the viewing angle of the display and prevent others from peeping, have been widely used in automotive displays, financial terminals, mobile terminals and other fields.

[0003] Currently, commonly used privacy screen protectors primarily employ grating or louver structures to control viewing angles. These protectors typically include alternating light-transmitting and light-blocking areas. The light-blocking areas block light emitted at large angles, thus limiting the viewing angle of the display screen to a smaller range, achieving a privacy effect. However, existing privacy screen protectors have several problems in practical applications. For example, traditional privacy screen protectors are usually symmetrical, with roughly the same viewing angle range in the upper (viewpoint) and lower directions. This results in insufficient brightness in the viewpoint direction, affecting the viewing experience. Furthermore, when the privacy screen protector comes into contact with the polarizer of the display screen, it can easily damage the polarizer, or the protector itself can be easily scratched, affecting the display effect. Moreover, privacy screen protectors are prone to warping, ripples, and other deformations under environmental conditions such as high temperature and humidity, and thermal shock, leading to uneven display. Therefore, this application proposes a privacy screen protector and display screen that at least partially solves the aforementioned problems. Summary of the Invention

[0004] In view of the aforementioned problems, embodiments of this application provide a privacy film and a display screen, which improve the display brightness and display uniformity of the display screen while achieving the privacy function.

[0005] The first aspect of this application provides a privacy film, comprising:

[0006] A membrane body having opposing first and second surfaces;

[0007] The film body includes multiple light-transmitting areas and multiple light-shielding areas, the light-transmitting areas and the light-shielding areas are arranged alternately, the light-transmitting areas extend along a first direction, and the first direction has a first angle with the thickness direction of the film body;

[0008] The opening width of the light-transmitting area on the first surface is greater than the opening width of the light-transmitting area on the second surface, so that the viewing angle range of the privacy film in the first direction is asymmetrical.

[0009] In one possible implementation, the transmittance of the privacy film in a first viewing angle range in the first direction is greater than the transmittance of the privacy film in a second viewing angle range in a second direction, which is opposite to the first direction.

[0010] In one possible implementation, the first direction is the direction toward the viewpoint, and the second direction is the direction away from the viewpoint.

[0011] In one possible implementation, the plurality of light-transmitting areas and the plurality of light-blocking areas constitute a venetian blind structure, wherein the material of the light-blocking areas is black resin and the material of the light-transmitting areas is transparent resin.

[0012] In one possible implementation, the refractive index difference between the light-transmitting area and the light-blocking area is configured to reduce ghosting caused by the privacy film.

[0013] In one possible implementation, at least one surface of the film body is provided with a finely frosted surface treatment layer.

[0014] In one possible implementation, the thickness of the privacy film is from 0.227 mm ± 0.03 mm to 0.425 mm ± 0.04 mm.

[0015] In one possible implementation, the louver pitch of the privacy film is 39 μm.

[0016] In one possible implementation, the viewing angle of the privacy film is between +34.5° / -30° ± 5° and +33° / -29° ± 5°.

[0017] In one possible implementation, the privacy film has a light transmittance of 72% or higher.

[0018] A second aspect of this application provides a display screen, including:

[0019] Display panel;

[0020] A privacy film disposed on the light-emitting side of the display panel, wherein the privacy film is the privacy film described in the first aspect or any implementation thereof.

[0021] In one possible implementation, the privacy film is disposed on the outside of the polarizer of the display panel, and the surface of the privacy film in contact with the polarizer is softened to avoid damaging the polarizer.

[0022] In one possible implementation, the display screen is an in-vehicle display screen, and the privacy film points in a first direction toward the viewpoint.

[0023] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0024] By setting the light-transmitting area of ​​the privacy film so that the opening width on the first surface is greater than the opening width on the second surface, the viewing angle range of the privacy film in the first direction is asymmetrical, thereby providing higher brightness and a better viewing experience in the viewing direction. At the same time, by optimizing the materials and structure of the privacy film, its scratch resistance and environmental reliability are improved, damage to the polarizer caused by the privacy film is reduced, and the service life of the display screen is extended. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a privacy film provided in one embodiment of this application;

[0027] Figure 2 This is a comparative viewpoint structure diagram of a traditional privacy film and a venetian blind array film provided in one embodiment of this application;

[0028] Figure 3 This is a schematic diagram illustrating the optical properties of a privacy film provided in one embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the hierarchical structure of a display screen provided in one embodiment of this application;

[0030] Figure 5 This is a schematic diagram comparing the scratch resistance of the privacy film provided in one embodiment of this application;

[0031] Figure 6 This is a schematic diagram comparing the first and second privacy film structures provided in one embodiment of the present application with the high temperature and high humidity resistance test of a conventional product.

[0032] Figure 7 This is a schematic diagram of the first privacy film structure provided in one embodiment of the present application;

[0033] Figure 8 This is a schematic diagram of the second privacy film structure provided in one embodiment of this application.

[0034] In the figure, 101 is the film body; 102 is the light-transmitting film; 103 is the fine frosted surface; 200 is the reflective and light-guiding components; 201 is the light guide plate; 202 is the diffuser sheet; 203 is the brightness enhancement film; 204 is the dual brightness enhancement film; 301 is the photosensitive sensor; 401 is the liquid crystal panel; and 402 is the polarizing film. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Please see Figure 1 , Figure 1 This is a schematic diagram of a privacy film structure according to an embodiment of this application. The privacy film in this embodiment includes a film body 101, which has opposing first and second surfaces. The film body 101 includes multiple light-transmitting areas and multiple light-blocking areas, which are arranged alternately. The light-transmitting areas extend along a first direction, and the first direction forms a first angle with the thickness direction of the film body 101. The opening width of the light-transmitting area on the first surface is greater than the opening width of the light-transmitting area on the second surface, so that the viewing angle range of the privacy film in the first direction is asymmetrical.

[0037] In traditional privacy films, the light-transmitting area is usually a symmetrical structure, with the same opening width in the upper and lower directions, resulting in roughly symmetrical viewing angles in the upper and lower directions. However, in this embodiment, by setting the light-transmitting area to an asymmetrical structure, the viewing angle of the privacy film in the first direction (i.e., the direction towards the viewpoint) is greater than the viewing angle in the second direction (i.e., the direction away from the viewpoint), thereby providing higher brightness and a better viewing experience in the viewpoint direction.

[0038] Please see Figure 2 , Figure 2 This is a comparative schematic diagram of the viewpoint structure of a traditional privacy film and a venetian blind array film provided in the embodiments of this application. Specifically, Figure 2 a shows the symmetrical lens structure of a traditional privacy film, in which the upper and lower openings of the light-transmitting area are of equal width, resulting in a symmetrical brightness distribution in the viewpoint direction (upper direction) and the lower direction; Figure 2 b illustrates the asymmetric lens shape of the privacy film (second privacy film structure, first privacy film structure) of an embodiment of this application, wherein the opening width of the light-transmitting area in the upper direction (towards the viewpoint) is greater than that in the lower direction, allowing more light to escape along the viewpoint direction. Figure 2 a and Figure 2As can be seen from the comparison in b, the privacy film of this embodiment has higher brightness in the viewing direction, while the conventional structure has lower brightness in the same direction. This is because the privacy film of this embodiment uses an asymmetric lens shape and high-efficiency materials.

[0039] In one possible implementation, the transmittance of the privacy film within a first viewing angle in a first direction is greater than its transmittance within a second viewing angle in a second direction, which is opposite to the first direction. Specifically, the first direction is the direction towards the viewpoint, and the second direction is the direction away from the viewpoint. Through this asymmetrical viewing angle design, the privacy film achieves its privacy function while ensuring optimal viewing brightness under normal viewing posture.

[0040] Please see Figure 3 , Figure 3 This is a schematic diagram of the optical properties of a privacy film provided in an embodiment of this application. Figure 3 'a' represents a schematic diagram of the test structure. Figure 3 b represents the relative brightness curves from different viewing angles. From Figure 3 As can be seen from b, under the same test conditions, the privacy film (first privacy film structure) of this application embodiment, when used in conjunction with a reflective polarizer, exhibits significantly superior brightness in the viewing direction compared to competing products. Specifically, within a viewing angle range of ±10°, the relative brightness of the privacy film of this application embodiment reaches 100% (baseline); within a viewing angle range of +20°, the relative brightness reaches 136%; and within a viewing angle range of +20° to +50°, the relative brightness reaches 132%. In contrast, the brightness of competing products is significantly lower. Therefore, the privacy film of this application embodiment can significantly improve the brightness of the display screen in the viewing direction while achieving privacy functionality, thereby reducing the number of LEDs used and achieving cost reduction and low power consumption.

[0041] In one possible implementation, multiple light-transmitting areas and multiple light-blocking areas constitute a louver structure. The light-blocking areas are made of black resin, and the light-transmitting areas are made of clear resin, such as PC film or PET film. Figure 1 (The light-transmitting film 102 in the image). The refractive index difference between the light-transmitting area and the light-blocking area is configured to reduce the double image phenomenon caused by the privacy film. For details, please refer to... Figure 8 , Figure 8This is a schematic diagram of the second privacy film structure provided in this embodiment, illustrating the ghosting phenomenon that may occur when the privacy film is placed in front of the display panel. There is a trade-off between ghosting and light transmittance. This embodiment effectively reduces ghosting while maintaining high light transmittance by adjusting the refractive index difference between the black resin and the transparent resin.

[0042] Please see Figure 4 , Figure 4 This is a schematic diagram of the layered structure of a display screen provided in an embodiment of this application. The display screen includes a liquid crystal panel 401, a polarizing film 402, and a privacy film disposed on the light-emitting side. It may also include reflective and light-guiding components 200 (such as a light guide plate 201, a diffuser 202, a brightness enhancement film 203, and a dual-brightness brightness enhancement film 204). As display modules become thinner and larger, the possibility of the privacy film coming into contact with the polarizing film (i.e., polarizing film 402) increases. If the material of the privacy film is too hard, it can easily damage the polarizing film, or the privacy film itself can be easily scratched. Therefore, the privacy film in this embodiment uses a soft and highly resilient material, making it less prone to scratches and preventing damage to the polarizing film.

[0043] Please see Figure 5 , Figure 5 This is a schematic diagram comparing the scratch resistance of the privacy films provided in the embodiments of this application. From Figure 5 It can be seen that the privacy film (second privacy film structure, first privacy film structure) of the present application embodiment is significantly better than the competing products in terms of scratch resistance.

[0044] In one possible implementation, at least one surface of the film body 101 is provided with a finely frosted surface treatment layer (such as...). Figure 4 The finely frosted surface 103 in the image. The finely frosted surface treatment layer can further reduce the surface reflection of the privacy film, improve the display contrast, and at the same time enhance the scratch resistance of the privacy film.

[0045] Please see Figure 6 , Figure 6 This diagram illustrates a comparison of the first and second privacy film structures provided in this embodiment with high-temperature and high-humidity resistance tests of conventional products. The test conditions were 35°C to 85°C for 168 hours. Figure 6 As can be seen, the privacy film (first privacy film structure) of this application embodiment does not exhibit warping or wavy phenomena, while conventional products (competitors) show wavy patterns at the edge fixing points. This indicates that the privacy film of this application embodiment has excellent high temperature and high humidity resistance.

[0046] The privacy film of this application embodiment underwent a thermal shock test under the conditions of -40°C (15 minutes) to 85°C (15 minutes) for 100 cycles. No damage was observed after the test, indicating that it has excellent thermal shock resistance.

[0047] Please see Figure 7 , Figure 7 This is a schematic diagram of the first privacy film structure provided in the embodiments of this application. The first privacy film structure adopts an asymmetric lens shape, with a thickness of 0.425 mm ± 0.04 mm, a louver pitch of 39 μm, a viewing angle range of +34.5° / -30° ± 5°, and a light transmittance of over 72%. This structure effectively improves the brightness in the viewing direction while ensuring the privacy effect.

[0048] In one possible implementation, the thickness of the aforementioned privacy film is from 0.227 mm ± 0.03 mm to 0.425 mm ± 0.04 mm. Specifically, the privacy film can have a thickness specification of 0.305 mm ± 0.03 mm (e.g., Figure 8 The second privacy screen structure shown can also have a thickness specification of 0.425 mm ± 0.04 mm (e.g. Figure 7 The first privacy screen protector structure shown can also have a thickness of 0.227 mm ± 0.03 mm. Privacy screen protectors of different thicknesses can be adapted to different display screen structures and space requirements.

[0049] In one possible implementation, the privacy film has a louver pitch of 39 μm. The louver pitch refers to the center-to-center distance between two adjacent light-transmitting (or light-blocking) areas. A 39 μm pitch design ensures privacy while avoiding noticeable moiré patterns.

[0050] In one possible implementation, the viewing angle of the privacy film ranges from +34.5° / -30° ± 5° to +33° / -29° ± 5°. Here, the "+" direction indicates the direction towards the viewpoint, and the "-" direction indicates the direction away from the viewpoint. Specifically, for a thickness of 0.305 mm ± 0.03 mm (e.g.... Figure 8 The second privacy film structure shown) and 0.425 mm ± 0.04 mm (as shown) Figure 7 The privacy film (shown as a first privacy film structure) has a viewing angle range of +34.5° / -30° ± 5°; for a privacy film with a thickness of 0.227 mm ± 0.03 mm, the viewing angle range is +33° / -29° ± 5°. This asymmetrical viewing angle design gives the privacy film a wider viewing angle and higher brightness in the viewing direction.

[0051] In one possible implementation, the privacy screen protector has a light transmittance of over 72%. Higher light transmittance means the privacy screen protector contributes less to the display's brightness, thus helping to reduce the display's power consumption.

[0052] This application embodiment also provides a display screen, including a display panel and a privacy film disposed on the light-emitting side of the display panel, wherein the privacy film is the privacy film described in any of the above implementations.

[0053] In one possible implementation, the privacy film is disposed on the outside of the polarizer of the display panel, and the surface of the privacy film in contact with the polarizer is softened to avoid damaging the polarizer.

[0054] In one possible implementation, the display is an in-vehicle display, with the privacy film's primary direction pointing towards the viewpoint. By aligning the privacy film's asymmetrical direction with the viewpoint direction, optimal viewing experience can be ensured while achieving privacy functionality.

[0055] The privacy film and display screen of this application embodiment achieve privacy functionality by setting the light-transmitting area of ​​the privacy film to an asymmetrical structure, resulting in higher brightness and a wider viewing angle in the viewing direction, while having a narrower viewing angle in the direction away from the viewing point. Furthermore, by optimizing the materials and structure of the privacy film, its scratch resistance and environmental reliability are improved, reducing damage to the polarizer and extending the lifespan of the display screen. In applications such as automotive displays where high brightness and reliability are required, the privacy film and display screen of this application embodiment have significant advantages.

[0056] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0057] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0058] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0059] The above provides a detailed description of the privacy film and display screen provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A privacy film, characterized in that, include: A membrane body having opposing first and second surfaces; The film body includes multiple light-transmitting areas and multiple light-shielding areas, the light-transmitting areas and the light-shielding areas are arranged alternately, the light-transmitting areas extend along a first direction, and the first direction has a first angle with the thickness direction of the film body; The opening width of the light-transmitting area on the first surface is greater than the opening width of the light-transmitting area on the second surface, so that the viewing angle range of the privacy film in the first direction is asymmetrical.

2. The privacy film according to claim 1, characterized in that, The transmittance of the privacy film in a first viewing angle range in the first direction is greater than the transmittance of the privacy film in a second viewing angle range in the second direction, which is opposite to the first direction.

3. The privacy film according to claim 1, characterized in that, The plurality of light-transmitting areas and the plurality of light-blocking areas constitute a venetian blind structure, wherein the material of the light-blocking areas is black resin and the material of the light-transmitting areas is transparent resin.

4. The privacy film according to claim 3, characterized in that, The refractive index difference between the light-transmitting area and the light-blocking area is configured to reduce the ghosting phenomenon produced by the privacy film.

5. The privacy film according to claim 1, characterized in that, The thickness of the privacy film is from 0.227 mm ± 0.03 mm to 0.425 mm ± 0.04 mm.

6. The privacy film according to claim 1, characterized in that, The privacy film has a louver pitch of 39 μm.

7. The privacy film according to claim 1, characterized in that, The viewing angle of the privacy film is from +34.5° / -30°± 5° to +33° / -29°± 5°.

8. The privacy film according to claim 1, characterized in that, The privacy film has a light transmittance of over 72%.

9. A display screen, characterized in that, include: Display panel; A privacy film disposed on the light-emitting side of the display panel, wherein the privacy film is the privacy film according to any one of claims 1 to 8.

10. The display screen according to claim 9, characterized in that, The display screen is a vehicle-mounted display screen, and the privacy film points in the first direction toward the viewpoint.

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