Privacy film and film forming equipment

Abstract

This application discloses a privacy film and a film-forming device, belonging to the field of display technology. The privacy film includes: a first transparent layer, a second transparent layer, and multiple light-shielding strips; the first and second transparent layers are stacked, and multiple carrier cavities are formed between the first and second transparent layers, with each light-shielding strip corresponding to one of the carrier cavities, and the light-shielding strips located within their respective carrier cavities; wherein, the modulus of the light-shielding strips is greater than the modulus of the first transparent layer, and the modulus of the light-shielding strips is greater than the modulus of the second transparent layer. This application allows for a thinner privacy film, which is beneficial for the miniaturization of display devices.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a privacy film and a film-forming device. Background Technology

[0002] With the rapid development of display technology, the application scenarios of display devices are gradually increasing, giving rise to the demand for privacy displays. This demand can usually be met by installing privacy films in the display device.

[0003] In related technologies, privacy films are manufactured by embossing onto a substrate to form multiple strip-shaped grooves. Furthermore, the dies used for embossing are coated with black paint to form a black coating within the grooves simultaneously with the formation of the multiple strip-shaped grooves. This allows the creation of a privacy film with a grating structure.

[0004] However, since privacy films are made by embossing, the substrate needs to be relatively thick to prevent the mold from puncturing the substrate during the embossing process. This results in a thicker privacy film, which is not conducive to making display devices thinner and lighter. Summary of the Invention

[0005] This application provides a privacy film and a film-forming device. The technical solution is as follows:

[0006] On one hand, the privacy film includes: a first transparent layer, a second transparent layer, and a plurality of light-blocking strips; the first transparent layer and the second transparent layer are stacked, and there are a plurality of carrier cavities between the first transparent layer and the second transparent layer, the plurality of light-blocking strips correspond one-to-one with the plurality of carrier cavities, and the light-blocking strips are located in the corresponding carrier cavities; wherein, the modulus of the light-blocking strips is greater than the modulus of the first transparent layer, and the modulus of the light-blocking strips is greater than the modulus of the second transparent layer.

[0007] Optionally, the modulus of the first transparent layer is greater than the modulus of the second transparent layer.

[0008] Optionally, the privacy film further includes a hardening layer located on the side of the first transparent layer away from the second transparent layer.

[0009] Optionally, the privacy film has a first planar area and a second planar area, and a bent area located between the first planar area and the second planar area; the hardening layer is located within the first planar area and the second planar area, and the hardening layer is located outside the bent area; wherein the length extension direction of the bent area is parallel to the length extension direction of the light-blocking strip.

[0010] Optionally, the surface of the light-shielding strip contacts the first transparent layer and the second transparent layer within the corresponding bearing cavity.

[0011] On the other hand, a film-forming apparatus is provided for producing a privacy film. The film-forming apparatus includes a material bin and a stretching mechanism. The material bin has a first receiving cavity, a second receiving cavity, and a third receiving cavity separately disposed therefrom. The second receiving cavity is distributed between the first receiving cavity and the third receiving cavity. The first receiving cavity has a first outlet. The second receiving cavity has a plurality of second outlets arranged along a first direction. The third receiving cavity has a third outlet. The first outlet, the plurality of second outlets, and the third outlet are all distributed on the same side of the material bin. The first direction is perpendicular to the first receiving cavity, the second receiving cavity, and the third receiving cavity. The arrangement direction of the cavities; the stretching mechanism is located on one side of the material box where the first discharge port, the plurality of second discharge ports, and the third discharge port are distributed; wherein, the stretching mechanism is configured to: after the first and third cavities both carry transparent materials, and the second cavity carries non-transparent materials, stretch the transparent materials discharged through the first and third discharge ports, and the non-transparent materials discharged through the plurality of second discharge ports, to form a privacy film, the privacy film comprising: a plurality of light-shielding strips formed by the non-transparent material, and a first transparent layer and a second transparent layer distributed on both sides of the plurality of light-shielding strips and formed by the transparent material.

[0012] Optionally, the stretching mechanism includes: a first roller group and a second roller group; the first roller group is located on one side of the material box where the first discharge port, the plurality of second discharge ports, and the third discharge port are distributed, and the second roller group is arranged adjacent to the first roller group; wherein, the first roller group is configured to: perform initial film-forming treatment on transparent materials discharged through the first discharge port and the third discharge port, and non-transparent materials discharged through the plurality of second discharge ports, to form an intermediate transition film layer; the second roller group is configured to: perform stretching treatment on the intermediate transition film layer to form the privacy film.

[0013] Optionally, the second roller group includes: a first stretching roller pair and a second stretching roller pair arranged sequentially in the traveling direction of the intermediate transition film layer, wherein the rotational speed of the rollers in the second stretching roller pair is greater than the rotational speed of the rollers in the first stretching roller pair.

[0014] Optionally, the stretching mechanism further includes a heating device distributed between the first roller group and the second roller group, the heating device being configured to heat the portion to be heated in the intermediate transition film layer.

[0015] Optionally, the stretching mechanism further includes: a reversing roller distributed between the first roller group and the second roller group; the first roller group includes: a first film-forming roller disposed adjacent to the reversing roller, and a second film-forming roller located on the side of the first film-forming roller away from the reversing roller; the rotation direction of the reversing roller is opposite to the rotation direction of the first film-forming roller, and the rotation direction of the reversing roller is the same as the rotation direction of the second film-forming roller; wherein, the reversing roller is configured to: change the travel direction of the intermediate transition film layer.

[0016] The beneficial effects of the technical solution provided in this application embodiment include at least the following: The privacy film provided in this application embodiment includes a first transparent layer, a second transparent layer, and multiple light-shielding strips. Since the multiple light-shielding strips are respectively located within multiple carrier cavities formed between the first and second transparent layers, and the first and second transparent layers can cover the multiple light-shielding strips, even if the multiple light-shielding strips are stretched, it can be ensured that the first and second transparent layers used to cover the multiple light-shielding strips can be stretched synchronously. Therefore, a stretching method can be used to form the privacy film. Furthermore, during the stretching process, the material used to make the light-shielding strips with a larger modulus has supporting properties and can support the materials used to make the first and second transparent layers with a smaller modulus, thus making it processable. The privacy film obtained in this way is not limited by the thickness of the substrate, thereby allowing for a thinner privacy film, which is beneficial for the miniaturization of display devices. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the cross-sectional structure of a privacy film provided in an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of another privacy film provided in an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the planar structure of a privacy film provided in an embodiment of this application;

[0021] Figure 4 This is a schematic diagram of the cross-sectional structure of another privacy film provided in an embodiment of this application;

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of another privacy film provided in an embodiment of this application;

[0023] Figure 6 This is a schematic diagram of the cross-sectional structure of another privacy film provided in an embodiment of this application;

[0024] Figure 7 This is a schematic diagram of the structure of a film-forming device provided in an embodiment of this application;

[0025] Figure 8 This is a schematic diagram of the structure of the discharge port of a material box provided in an embodiment of this application;

[0026] Figure 9 This is a schematic diagram of another film-forming device provided in an embodiment of this application. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0028] In related technologies, privacy films are manufactured by imprinting on a substrate to form multiple strip-shaped grooves. Furthermore, the mold used for imprinting is coated with black paint to form a black coating within the grooves simultaneously. This creates a privacy film with a grating structure. However, because the privacy film is manufactured by imprinting, the substrate needs to be relatively thick to prevent the mold from puncturing it during the imprinting process. This results in a thicker privacy film, which is detrimental to the thinning and lightening of display devices.

[0029] Therefore, embodiments of this application provide a film-forming apparatus to improve the above-mentioned problems.

[0030] Figure 1 This is a schematic cross-sectional view of a privacy film provided in an embodiment of this application. Figure 1 As shown, the privacy film 3 includes a first transparent layer 32, a second transparent layer 33, and a plurality of light-blocking strips 31. The first transparent layer 32 and the second transparent layer 33 are stacked, and a plurality of carrier cavities 30 are provided between the first transparent layer 32 and the second transparent layer 33. The plurality of light-blocking strips 31 and the plurality of carrier cavities 30 correspond one-to-one, and the light-blocking strips 31 are located within the corresponding carrier cavities 30.

[0031] For example, such as Figure 1 As shown, the surface of the light-shielding strip 31 is in contact with the first transparent layer 32 and the second transparent layer 33 within the corresponding bearing cavity 30. Therefore, even if multiple light-shielding strips 31 are stretched, it can be ensured that the first transparent layer 32 and the second transparent layer 33 used to cover the multiple light-shielding strips 31 can be stretched synchronously. Thus, the privacy film 3 can be formed by stretching.

[0032] For example, such as Figure 1As shown, multiple light-blocking strips 31 are arranged in parallel along the first direction x to form a grating structure, which can also be called a venetian blind structure. Figure 2 This is a schematic diagram of the cross-sectional structure of another privacy film provided in an embodiment of this application. For example... Figure 2 As shown, since light can only escape from the gap between two adjacent light-blocking strips 31, if the first position A1 of the privacy film 3 is taken as the reference, the line connecting the first position A1 and the privacy film is taken as the reference line L1, and the reference line L1 is perpendicular to the privacy film 3, and the intersection of the reference line L1 and the privacy film 3 is recorded as O. When viewing the image behind the privacy film 3, the user can only clearly see the image at the first position A1 and within a certain angle with the reference line L1, such as between the second position A2 and the third position A3. If the angle between the user's position and the reference line L1 is too large, the light will be blocked by the light-blocking strips 31 in the grating structure, and the image will not be clearly seen. That is, the brightness of the light received by the human eye is small, or even the image cannot be seen, i.e., the brightness of the light received by the human eye is zero, thus achieving the function of privacy protection.

[0033] Optionally, the line connecting the second position A2 and the intersection point O is reference line L2, and the line connecting the third position A3 and the intersection point O is reference line L3. Optionally, the angle between reference line L2 and reference line L1 is 30 degrees, the angle between reference line L3 and reference line L1 is 30 degrees, and the area between reference line L2 and reference line L3 is the visible area with a viewing angle of 60 degrees. When viewing the image behind the privacy film 3 outside the visible area, the brightness of the image light received by the human eye is less than or equal to 5% of the image light brightness; that is, outside the visible area, the transmittance of the privacy film 3 is less than 5%. Thus, it serves as a privacy screen.

[0034] It should be noted that the above angles and transmittance are merely illustrative examples and are not limited in this application. The viewing angle and transmittance of the privacy film outside the visible area can be customized according to customer needs.

[0035] It should be noted that, Figure 2 The location of the intersection point O is only for illustration and does not mean that the intersection point O is necessarily located on the upper surface of the first transparent layer 32.

[0036] The modulus of the light-shielding strip 31 is greater than that of the first transparent layer 32, and the modulus of the light-shielding strip 32 is greater than that of the second transparent layer 33. Therefore, during the stretching process, the material used to make the light-shielding strip with a larger modulus has supporting properties and can support the materials used to make the first transparent layer 32 and the second transparent layer 33 with smaller modulus, thus making the materials used to make the light-shielding strip 31, the first light-shielding layer 32, and the second light-shielding layer 33 processable. If all the materials are too soft, the privacy film will not be able to be formed, especially the cross-sectional shape of the light-shielding strip 31 will be deformed, thus making it impossible to form a grating structure with privacy protection.

[0037] Compared with related technologies, the privacy film obtained by stretching in this application embodiment is not limited by the thickness of the substrate, thereby making the formed privacy film thinner, which is beneficial to the product thinning of the display device.

[0038] In summary, the privacy film provided in this application includes a first transparent layer, a second transparent layer, and multiple light-shielding strips. Since the multiple light-shielding strips are located within multiple carrier cavities formed between the first and second transparent layers, and the first and second transparent layers can cover the multiple light-shielding strips, even if the multiple light-shielding strips are stretched, the first and second transparent layers used to cover the multiple light-shielding strips can be stretched synchronously. Therefore, a stretching method can be used to form the privacy film. Furthermore, during the stretching process, the material used to make the light-shielding strips with a higher modulus has supporting properties and can support the materials used to make the first and second transparent layers with lower modulus, thus making it processable. The privacy film obtained in this way is not limited by the thickness of the substrate, thereby allowing for a thinner privacy film, which is beneficial for the miniaturization of display devices.

[0039] In one possible embodiment, the first transparent layer 32 is made of the same material as the second transparent layer 33. In this case, the first transparent layer 32 and the second transparent layer 33 are connected as a single structure, and there is no boundary line between the first transparent layer 32 and the second transparent layer 33. In another possible embodiment, the first transparent layer 32 may be made of a different material than the second transparent layer 33. If the refractive index of the first transparent layer 32 is different from that of the second transparent layer 33, then an optical interface exists between the first transparent layer 32 and the second transparent layer 33.

[0040] For example, the modulus of the first transparent layer 32 is greater than that of the second transparent layer 33, so that the first transparent layer 32 can be positioned on the side closer to the user. By setting a larger modulus for the first transparent layer 32 closer to the user, the surface feel of the privacy film 3 is improved.

[0041] Optionally, the modulus of the first transparent layer 32 is 20 megapascals (MPa) to 200 megapascals (MPa), for example, 20 to 100. Optionally, the modulus of the second transparent layer 33 is 20 megapascals (MPa) to 200 megapascals (MPa).

[0042] Optionally, the first transparent layer 32 can be made of a resin material, such as polyurethane (PU). Optionally, the second transparent layer 33 can also be made of a resin material, such as polyurethane (PU). Resin materials such as polyurethane have a low modulus, which helps the privacy film 3 withstand multiple bends.

[0043] Optionally, the total thickness of the first transparent layer 32 and the second transparent layer 33 is 30 micrometers to 120 micrometers. For example, the total thickness of the first transparent layer 32 and the second transparent layer 33 is 30 micrometers to 80 micrometers, or, for example, 70 micrometers to 120 micrometers. If the thickness of the first transparent layer 32 and the second transparent layer 33 is too thin, it may result in the transparent material being unable to cover the non-transparent material. If the total thickness of the first transparent layer 32 and the second transparent layer 33 is too thick, it is not conducive to the thinning and lightening of the display device.

[0044] Optionally, the modulus of the light-shielding strip 31 is greater than or equal to 2 gigapascals (GPa). For example, the modulus of the light-shielding strip 31 is 2 gigapascals (GPa) to 4 gigapascals (GPa).

[0045] For example, the material used to make the light-shielding strip 31 includes a substrate and a plurality of non-transparent particles distributed in the transparent substrate. The substrate has a low modulus, which facilitates stretching, thereby allowing coarser filaments to be stretched into a finer light-shielding strip 31 after passing through a film-forming device.

[0046] Optionally, the non-transparent particles can be reflective metal particles to form a reflective light-blocking strip 31. The reflective light-blocking strip 31 not only serves as a privacy screen but also reflects the light from the image behind the privacy film, increasing the brightness of the light incident on the user's eyes.

[0047] Alternatively, the non-transparent particles can also be light-absorbing black particles, such as carbon particles, to form a light-absorbing light-blocking strip 31. The light-absorbing light-blocking strip 31 not only serves as a privacy barrier but also avoids problems such as ghosting caused by reflection from the light-blocking strip 31.

[0048] Figure 3 This is a schematic diagram of the planar structure of a privacy film provided in an embodiment of this application, and Figure 2 yes Figure 3 A schematic diagram of the cross-sectional structure along section line EE. (e.g.) Figure 3As shown, the privacy film 3 has a bending axis M, the extension direction of which is parallel to the length extension direction of the light-shielding strip 31, that is, the extension direction of the bending axis M is perpendicular to the arrangement direction (first direction x) of the light-shielding strip 31. The bending axis M is located between two adjacent light-shielding strips 31.

[0049] Because the light-shielding strip 31 has a large modulus and is not easily bent, a bending axis M is provided between two adjacent light-shielding strips 31. Since the first transparent layer 32 and the second transparent layer 33 have smaller moduli, only the first transparent layer 32 and the second transparent layer 33 are bent during bending, without damaging the grating structure formed by the light-shielding strips 31. Optionally, the privacy film provided in this embodiment can withstand more than 200,000 bends; therefore, the privacy film 3 provided in this embodiment can be applied to foldable display devices, such as foldable mobile phones.

[0050] The privacy screen protector in this technology includes a substrate with multiple parallel grooves. A black coating within these grooves forms a grating structure, achieving the privacy function. The substrate is typically manufactured using an embossing process, resulting in a thicker substrate and consequently a thicker privacy screen protector, which is detrimental to achieving a thinner and lighter display device. Furthermore, the substrate needs a high modulus for machinability; otherwise, it might be too soft to emboss the shape of the multiple grooves. If this privacy screen protector were to be used in a foldable display device, the bending axis would inevitably pass through the substrate with its high modulus, and the privacy screen protector would be damaged after only a few bends. Therefore, the privacy screen protector in this technology is unsuitable for use in foldable display devices.

[0051] Optionally, multiple bending axes M may be designed depending on the different shapes of the foldable display device. For example, the privacy film 3 may have two or more bending axes M. Alternatively, no bending axes may be designed.

[0052] For example, such as Figure 3 As shown, the privacy film 3 has a first planar area B and a second planar area D, and a bending area C located between the first planar area B and the second planar area D. The bending axis M is located in the bending area C, and the length extension direction of the bending area C is parallel to the length extension direction of the light-blocking strip 31.

[0053] Figure 4 This is a schematic cross-sectional view of another privacy film provided in an embodiment of this application. In one possible embodiment, such as... Figure 4 As shown, the privacy film 3 also includes a hardened layer 34, which is located on the side of the first transparent layer 32 away from the second transparent layer 33, so as to facilitate the placement of the hardened layer 34 on the side closer to the user. By providing a hardened layer on the surface of the privacy film, the surface of the privacy film 3 has a better tactile feel, thus improving the user experience.

[0054] Combination Figure 3 and Figure 4The hardened layer 34 is located in the first planar region B, the second planar region D, and the bending region C. That is, the orthographic projection of the bending axis M onto the reference plane lies within the orthographic projection of the hardened layer 34 onto the reference plane. The elongation at break of the hardened layer 34 is less than or equal to 3%. The privacy film has both a bent shape and a planar shape. In the planar shape, the reference plane is parallel to the plane containing the grating structure formed by the multiple light-shielding strips 31.

[0055] Because the hardened layer 34 is provided throughout the entire layer, that is, the hardened layer 34 covers the bending area C, the elongation at break of the hardened layer 34 is less than or equal to 3%, so that the hardened layer 34 will not be damaged during repeated bending of the privacy film 3.

[0056] The elongation at break of the hardened layer 34 is less than or equal to 3%. This means that when the hardened layer 34 is subjected to external force until it breaks, the ratio of the length after stretching to the length before stretching is called the elongation at break, and this ratio is less than or equal to 3%. The lower the elongation at break of the hardened layer 34, the less easily the hardened layer 34 is deformed.

[0057] Optionally, the hardened layer 34 may be made of materials with high modulus, such as acrylic.

[0058] Optionally, the thickness of the hardened layer 34 is 5 micrometers (μm) to 10 micrometers (μm).

[0059] Figure 5 This is a schematic cross-sectional view of another privacy film provided in an embodiment of this application. In another possible embodiment, it may not be as... Figure 4 Instead of providing a hardened layer 34 across the entire surface, the hardened layer 34 is provided away from the bending area C. Combined with... Figure 3 and Figure 5 The hardened layer 34 is located within the first planar region B and the second planar region D, and outside the bending region C. The length extension direction of the bending region C is parallel to the length extension direction of the light-shielding strip 31. By providing the hardened layer 34 only in the first planar region B and the second planar region D outside the bending region C, damage to the hardened layer 34 during bending can be avoided.

[0060] For example, such as Figure 4 or Figure 5 As shown, the privacy film 3 also includes an anti-fingerprint coating 35, which is located in the first planar area B, the bending area C, and the second planar area D, and covers the hardened layer 34, so that the privacy film 3 has an anti-fingerprint function.

[0061] In one possible embodiment, such as Figure 4 or Figure 5 As shown, the cross-sectional shape of the light-shielding strip 31 is rectangular. Figure 6 This is a schematic diagram of the cross-sectional structure of another privacy film provided in an embodiment of this application. For example... Figure 6 As shown, the cross-sectional shape of the light-shielding strip 31 can also be wedge-shaped, i.e., a narrow and tall trapezoid. Setting the sidewalls of the light-shielding strip 31 as a plane, that is, setting the side edges of the cross-section of the light-shielding strip 31 as straight segments, facilitates the confirmation of the light path position. This allows for the design of the specific dimensions of the privacy film according to the customer's privacy requirements, such as the design of the height of the grating structure and the spacing between two adjacent light-shielding strips 31.

[0062] For example, see again Figure 2 If the privacy requirement is a viewing angle of 60 degrees, and the image behind the privacy film 1 is viewed from outside the viewing area, the brightness of the light received by the human eye is less than or equal to 5% of the brightness of the image.

[0063] Based on privacy requirements, and considering the distance between the grating structure in the privacy film 3 and the light-emitting layer of the display panel (e.g., 100 micrometers to 200 micrometers), as well as the size of a pixel unit (e.g., the size of a pixel unit is 40 micrometers to 120 micrometers in the direction parallel to the privacy film 3), the position of the light path is determined, thereby designing the height of the grating structure, the width of the light-shielding strip 31, the distance between two adjacent light-shielding strips 31, and the film thickness of the privacy film 3, i.e., the total thickness of the first transparent layer 32 and the second transparent layer 33.

[0064] Based on the relevant dimensions of the privacy film 3, the process parameters of the film-forming equipment are preliminarily determined. For example, the rotational speed of the second stretching roller relative to the roller in 222 and the ratio of the rotational speed of the second stretching roller relative to the roller in 221 are preliminarily determined. After producing privacy film samples using the film-forming equipment and testing the privacy film samples using optical testing equipment, if the requirements are not met, the process parameters of the film-forming equipment are adjusted, and a new round of production testing is carried out. This process can be repeated multiple times to obtain a privacy film that finally meets the customer's privacy requirements.

[0065] Optionally, the height of the grating structure formed by the multiple light-shielding strips 31 is 50 micrometers (μm) to 100 micrometers (μm) to avoid the grating structure being too thin to effectively block light from reaching the location of anyone other than the user, thus failing to provide privacy protection, and to avoid the grating structure being too thick, resulting in a smaller viewing angle and affecting the user experience. Here, the height of the grating structure is the dimension of the light-shielding strip 31 in the thickness direction of the privacy film 3.

[0066] Optionally, in the first direction x, the distance between two adjacent light-shielding strips 31 is 10 micrometers (μm) to 40 micrometers (μm).

[0067] Optionally, in the first direction x, the size of the light-shielding strip 31, i.e. the width of the light-shielding strip 31, is 5 micrometers (μm) to 15 micrometers (μm).

[0068] In summary, the privacy film provided in this application includes a first transparent layer, a second transparent layer, and multiple light-shielding strips. Since the multiple light-shielding strips are located within multiple carrier cavities formed between the first and second transparent layers, and the first and second transparent layers can cover the multiple light-shielding strips, even if the multiple light-shielding strips are stretched, the first and second transparent layers used to cover the multiple light-shielding strips can be stretched synchronously. Therefore, a stretching method can be used to form the privacy film. Furthermore, during the stretching process, the material used to make the light-shielding strips with a higher modulus has supporting properties and can support the materials used to make the first and second transparent layers with lower modulus, thus making it processable. The privacy film obtained in this way is not limited by the thickness of the substrate, thereby allowing for a thinner privacy film, which is beneficial for the miniaturization of display devices.

[0069] This application embodiment also provides a display panel, which includes any of the aforementioned privacy films. The display panel includes a driving backplate, and a light-emitting layer, an encapsulation layer, and a cover plate sequentially disposed on the driving backplate, with the privacy film located between the encapsulation layer and the cover plate. The privacy film of this application embodiment can be directly disposed in the display panel to enable the display panel to have a privacy function. Exemplarily, the display panel is a flexible display panel.

[0070] The display panel has the same effect as the aforementioned privacy film, which will not be described in detail here.

[0071] This application also provides a display device, which includes a display panel and any of the aforementioned privacy films, wherein the privacy film is located on the side of the display panel closer to the user; or, the display device includes the aforementioned display panel.

[0072] For example, the display device is a foldable display device. Optionally, the foldable display device can be folded left and right, thereby preventing adjacent people from seeing the image information on the display device in scenarios such as participating in meetings. Optionally, the foldable display device can also be folded vertically.

[0073] For example, the display device provided in the embodiments of this application can be any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0074] This display device has the same effect as the aforementioned privacy film, which will not be described in detail here.

[0075] This application also provides a film-forming device. Figure 6 This is a schematic diagram of the structure of a film-forming device provided in an embodiment of this application. Figure 7As shown, the film-forming equipment is used to produce privacy films. The film-forming equipment includes a material bin 1 and a stretching mechanism 2. The material bin 1 has a first receiving cavity 11, a second receiving cavity 12, and a third receiving cavity 13, which are separately arranged. The second receiving cavity 12 is distributed between the first receiving cavity 11 and the third receiving cavity 13. The material bin 1 is used to hold raw materials, and the stretching mechanism 2 is used to stretch the material to form a thin privacy film.

[0076] Figure 8 This is a schematic diagram of the discharge port of a material bin provided in an embodiment of this application. Combined with... Figure 7 and Figure 8 The first receiving cavity 11 has a first discharge port 111, the second receiving cavity 12 has a plurality of second discharge ports 121 arranged along the first direction x, and the third receiving cavity 13 has a third discharge port 131. The first discharge port 111, the plurality of second discharge ports 121 and the third discharge port 131 are all distributed on the same side of the material box 1, and the first direction x is perpendicular to the arrangement direction of the first receiving cavity 11, the second receiving cavity 12 and the third receiving cavity 13.

[0077] By arranging multiple second discharge ports 121 along the first direction x, multiple filaments arranged along the first direction x are obtained. This facilitates the formation of multiple finer light-blocking strips after stretching by the stretching mechanism 2, forming a grating structure and thus obtaining a privacy film with anti-peeping effect. Furthermore, by placing the first discharge port 111 and the third discharge port 113 on both sides of the multiple second discharge ports 121, it is convenient to form an initial film layer by, for example, co-extrusion, thereby facilitating further processing of the initial film layer by the subsequent stretching mechanism 2 to form the privacy film layer.

[0078] Combination Figure 7 and Figure 8 The stretching mechanism 2 is located on one side of the material box 1, where a first discharge port 11, multiple second discharge ports 12, and a third discharge port 13 are distributed. The stretching mechanism 2 is configured to stretch the transparent material exiting through the first discharge port 11 and the third discharge port 13, as well as the non-transparent material exiting through the multiple second discharge ports 12, after the first receiving cavity 11 and the third receiving cavity 13 both contain transparent material and the second receiving cavity 12 contains non-transparent material, to form a privacy film. Positioning the stretching mechanism 2 on one side of the discharge ports of the material box 1 facilitates the processing of the material exiting through the discharge ports.

[0079] See you again Figure 1 The privacy film 3 includes: a plurality of light-blocking strips 31 formed of non-transparent material, and a first transparent layer 32 and a second transparent layer 33 distributed on both sides of the plurality of light-blocking strips 31 and formed of transparent material.

[0080] Multiple light-blocking strips 31 form a grating structure, which can also be called a venetian blind structure. Since light can only escape from the gap between two adjacent light-blocking strips 31, if the first position A1 of the privacy film 3 is taken as a reference, the line connecting the first position A1 and the privacy film is a reference line L1, and the reference line L1 is perpendicular to the privacy film 3. When viewing the image behind the privacy film 3, the user can only clearly see the image at the first position A1 and within a certain angle with the reference line L1, such as between the second position A2 and the third position A3. If the angle between the user's position and the reference line L1 is too large, the light will be blocked by the light-blocking strips 31 in the grating structure, and the image will not be clearly visible. That is, the brightness of the light received by the human eye is small, or even the image cannot be seen, i.e., the brightness of the light received by the human eye is zero, thus achieving the function of privacy protection.

[0081] Compared with related technologies, since this application does not use an imprinting method to form the privacy film, but rather a stretching method, the privacy film formed using the film forming equipment provided in this application is not limited by the thickness of the substrate, thereby making the formed privacy film thinner and facilitating the product thinning of the display device.

[0082] In summary, the film-forming equipment provided in this application includes a material bin and a stretching mechanism. After the first and third receiving cavities of the material bin both contain transparent material, and the second receiving cavity of the material bin contains non-transparent material, the stretching mechanism can stretch the transparent material exiting through the first and third discharge ports, as well as the non-transparent material exiting through multiple second discharge ports, to obtain a privacy film. The privacy film obtained in this way is not limited by the thickness of the substrate, thus allowing the privacy film formed by the film-forming equipment to be thinner, which is beneficial for the miniaturization of display devices.

[0083] Figure 9 This is a schematic diagram of another film-forming device provided in an embodiment of this application. For example... Figure 9 As shown, the stretching mechanism 2 includes: a first roller group 21 and a second roller group 22.

[0084] The first roller assembly 21 is located on one side of the material box 1 where the first discharge port 111, multiple second discharge ports 121, and a third discharge port 131 are distributed. The second roller assembly 22 is arranged adjacent to the first roller assembly 21. The first roller assembly 21 is configured to perform initial film-forming treatment on transparent materials discharged through the first discharge port 111 and the third discharge port 131, and non-transparent materials discharged through the multiple second discharge ports 121, to form an intermediate transition film layer. The second roller assembly 22 is configured to perform stretching treatment on the intermediate transition film layer to form a privacy film.

[0085] By setting a first roller group 21 on one side of the material bin 1 to distribute the discharge ports, transparent material can be discharged through the first discharge port 111 and the third discharge port 131, and non-transparent material can be discharged through the second discharge port 121 before entering the first roller group 21. The first roller group 21 can shape the discharged transparent and non-transparent materials by extruding them, thereby forming an intermediate transition film layer. By setting a second roller group 22, the intermediate transition film layer is stretched, thereby making the non-transparent material in the intermediate transition film layer thinner to form a light-blocking strip, and reducing the thickness of the intermediate transition film layer to form a thinner privacy film.

[0086] In the embodiments of this application, such as Figure 9 As shown, the second roller group 22 includes: a first stretching roller pair 221 and a second stretching roller pair 222 arranged sequentially in the travel direction of the intermediate transition film layer, wherein the rotational speed of the rollers in the second stretching roller pair 222 is greater than the rotational speed of the rollers in the first stretching roller pair 221.

[0087] If the rotational speed of the second stretching roller pair 222 is the same as that of the first stretching roller pair 221, it will not stretch the film layer. However, this application achieves this by making the rotational speed of the second stretching roller pair 222 greater than that of the first stretching roller pair 221. Under the action of friction between the rollers and the film layer, both the first stretching roller pair 221 and the second stretching roller pair 222 can stretch the film layer.

[0088] For the portion of the film layer located between the first stretching roller pair 221 and the second stretching roller pair 222, the end of this portion of the film layer closer to the first stretching roller pair 221 is called the first end, and the end of this portion of the film layer closer to the second stretching roller pair 222 is called the second end. Under the action of the frictional force between the first stretching roller pair 221 and the film layer, the first end is not affected by the faster rotation speed of the second stretching roller pair 222 and moves quickly along the travel direction of the intermediate transition film layer. Under the action of the frictional force between the second stretching roller pair 222 and the film layer, the second end moves faster relative to the first end along the travel direction of the intermediate transition film layer. That is, the second end moves relative to the first end along the side away from the first end. In this way, the stretching effect is achieved.

[0089] For example, after passing through the second roller group 22, the privacy film is stretched by about 2 to 5 times relative to the intermediate transition film layer.

[0090] For example, the first stretching roller pair 221 includes two first stretching rollers 2210 arranged opposite each other, the two first stretching rollers 2210 rotating at the same speed and in opposite directions, and the intermediate transition film layer can pass between the two first stretching rollers 2210.

[0091] Optionally, one of the two first stretching rollers 2210 is a rubber roller and the other is a steel roller; or, both first stretching rollers 2210 are rubber rollers. Since the friction of the rubber roller is relatively large, at least one rubber roller is provided in the first stretching roller pair 221 to ensure that there is sufficient friction between the first stretching roller pair 221 and the film layer.

[0092] For example, the second stretching roller pair 222 includes two opposing second stretching rollers 2220, which rotate at the same speed and in opposite directions, and the intermediate transition film layer can pass between the two second stretching rollers 2220.

[0093] Optionally, one of the two second stretching rollers 2220 is a rubber roller and the other is a steel roller; or, both second stretching rollers 2220 are rubber rollers. Since the friction of the rubber roller is relatively large, at least one rubber roller is provided in the second stretching roller pair 222 to ensure that there is sufficient friction between the second stretching roller pair 222 and the film layer.

[0094] For example, the distance between the two second stretching rollers 2220 is smaller than the distance between the two first stretching rollers 2210. The thickness of the intermediate transition film layer also decreases while being stretched, so by limiting the distance between the two stretching rollers 2220 and the distance between the two first stretching rollers 2210, sufficient friction is achieved between the second stretching roller pair 222 and the intermediate transition film layer.

[0095] In the embodiments of this application, such as Figure 9 As shown, the stretching mechanism 2 further includes a heating device 23 distributed between the first roller group 21 and the second roller group 22. The heating device 23 is configured to heat the portion of the intermediate transition film layer to be heated. By providing the heating device 23, the intermediate transition film layer is heated, and the heated intermediate transition film layer is softer and easier to process, thereby facilitating the subsequent stretching of the intermediate transition film layer by the second roller group 22.

[0096] Optionally, the heating device 23 is an oven. Optionally, the portion of the intermediate transition film layer to be heated is heated by blowing hot air onto it.

[0097] For example, such as Figure 9 As shown, the heating device 23 further includes a first support roller 231 and a second support roller 232, which are used to support the portion of the intermediate transition film layer distributed between the first roller group 21 and the second roller group 22, and the portion of the intermediate transition film layer to be heated is located between the first support roller 231 and the second support roller 232.

[0098] Since the portion of the intermediate transition film layer to be heated becomes relatively soft, the first support roller 231 and the second support roller 232 are provided to support it and prevent the soft intermediate transition film layer from collapsing. Furthermore, since the soft intermediate transition film layer will also be stretched by gravity while collapsing, the first support roller 231 and the second support roller 232 prevent the cross-sectional dimensions of the filaments in the intermediate transition film layer, which should be controlled within the second roller group 22, from changing due to collapse and stretching, thereby ensuring the product quality of the privacy film.

[0099] For both non-transparent and transparent materials discharged from the outlet of the material bin 1, after passing through the first roller group 21 to form an intermediate transition film layer, the thickness of the intermediate transition film layer is not very uniform and internal stress exists. After the heating device 23 and the second roller group 22 process the intermediate transition film layer in sequence, the internal stress can be reduced and the film thickness can be made more uniform.

[0100] For example, such as Figure 9 As shown, the stretching mechanism 2 also includes a reversing roller 24 distributed between the first roller group 21 and the second roller group 22. The reversing roller 24 is configured to change the travel direction of the intermediate transition film layer. By setting the reversing roller 24 to change the travel direction of the intermediate transition film layer, it is convenient to set up other structures such as the aforementioned heating device 23 and the second roller group 22 according to the actual space available for setting up the film forming equipment.

[0101] like Figure 9 As shown, by setting the reversing roller 24, the structures of the first roller group 21, the heating device 23, and the second roller group 22 can be arranged on the same horizontal plane as much as possible. This makes it easier for the travel direction of the intermediate transition film layer to be parallel or approximately parallel to the ground, reducing the influence of gravity on the intermediate transition film layer. If the travel direction of the intermediate transition film layer is perpendicular to the ground, then gravity may stretch the intermediate transition film layer, which is not conducive to changing the product size of the privacy film simply by adjusting process parameters (such as the ratio of the rotational speed of the first roller pair 221 to the rotational speed of the second roller pair 222 in the second roller group 22).

[0102] The first roller assembly 21 includes a first film-forming roller 211 disposed adjacent to the reversing roller 24, and a second film-forming roller 212 located on the side of the first film-forming roller 211 opposite to the reversing roller 24. The rotation direction of the reversing roller 24 is opposite to the rotation direction of the first film-forming roller 211, and the rotation direction of the reversing roller 24 is the same as the rotation direction of the second film-forming roller 212.

[0103] Because the rotation direction of the first film-forming roller 211 is opposite to that of the second film-forming roller 212, both transparent and opaque materials exiting through the discharge port can pass between the first film-forming roller 211 and the second film-forming roller 212, forming an intermediate transition film layer. Furthermore, because the rotation direction of the reversing roller 24 is opposite to that of the first film-forming roller 211, the intermediate transition film layer formed by passing between the first and second film-forming rollers 211 can further pass between the reversing roller 24 and the first film-forming roller 211, and the direction of travel changes. For example... Figure 9 As shown, the direction of travel of the intermediate transition membrane layer changes from vertical to horizontal.

[0104] In this embodiment of the application, the distance between the first film-forming roller 211 and the reversing roller 24 is less than or equal to the distance between the first film-forming roller 211 and the second film-forming roller 212.

[0105] In an embodiment where the distance between the first film-forming roller 211 and the reversing roller 24 is equal to the distance between the first film-forming roller 211 and the second film-forming roller 212, the reversing roller 24 only serves a reversing function. In an embodiment where the distance between the first film-forming roller 211 and the reversing roller 24 is less than the distance between the first film-forming roller 211 and the second film-forming roller 212, the reversing roller 24 not only serves a reversing function but also works with the first film-forming roller 211 to perform a secondary extrusion and shaping effect on the intermediate transition film layer.

[0106] In one possible embodiment, combined with Figure 8 and Figure 9 The second receiving cavity 12 is configured to receive multiple non-transparent filaments, each corresponding to a plurality of second discharge ports 121, and the non-transparent filaments are discharged through the corresponding second discharge ports 121. In another possible embodiment, the second receiving cavity 12 is configured to receive molten non-transparent material.

[0107] Different states of opaque materials can be flexibly selected for input into the second receiving cavity 12 as needed. If multiple opaque filaments are input into the second receiving cavity 12, the multiple second discharge ports 121 serve to arrange the multiple opaque filaments, causing them to be arranged along the first direction x. Optionally, multiple opaque filaments can be formed by a spinning machine.

[0108] If a molten, opaque material is introduced into the second receiving cavity 12, the molten, opaque material will form multiple filaments arranged along the first direction x when it is discharged from the multiple second discharge ports 121.

[0109] For example, see again Figure 9For the cooled transparent material, namely the first transparent layer 32 and the second transparent layer 33 in the privacy film 3, and for the cooled non-transparent material, namely the light-blocking strip 31 in the privacy film 3, the modulus of the light-blocking strip 31 is greater than the modulus of the first transparent layer 32, and the modulus of the light-blocking strip 31 is greater than the modulus of the second transparent layer 33.

[0110] The light-blocking strip 31 with a larger modulus, or the non-transparent filament used to form the light-blocking strip 31 with a larger modulus, can play a supporting role, thereby facilitating the formation of the intermediate transition film layer and processing of the intermediate transition film layer, rather than making it difficult to process because the individual structures in the intermediate transition film layer are relatively soft and difficult to form.

[0111] Materials with higher modulus usually have higher melting points. Therefore, if the second receiving cavity 12 is configured to receive molten non-transparent materials, the material box 1 also includes a material heating device (not shown in the figure). The material heating device is configured to heat the material in the second receiving cavity 12, thereby keeping the non-transparent material in the second receiving cavity 12 in a molten state.

[0112] Optionally, the material bin 1 also includes a material cooling device (not shown), which is located on the side of the second discharge port 121 away from the second receiving cavity 12. The material cooling device is configured to cool the non-transparent material discharged through the second discharge port 121 to facilitate the formation of filaments. Optionally, in the direction of material discharge, for example in... Figure 9 In the downward direction shown, the material cooling device is located between the second discharge port 121 and the first discharge port 111, and between the second discharge port 121 and the third discharge port 131, so that the non-transparent material can first form a filament with a lower temperature and a more stable cross-sectional shape before contacting the transparent material.

[0113] Optionally, the film-forming apparatus further includes a first filter and a second filter. The first filter has an outlet, and the outlet of the first filter is connected to a first receiving cavity 11. The first filter is configured to filter non-transparent materials to reduce impurities in the non-transparent materials carried in the first receiving cavity 11. The second filter has an outlet, and the outlet of the second filter is connected to a third receiving cavity 13. The second filter is configured to filter non-transparent materials to reduce impurities in the non-transparent materials carried in the third receiving cavity 13.

[0114] For example, see again Figure 8 and Figure 9Both the first outlet 111 and the third outlet 131 are slits, with the length direction of the first outlet 111 parallel to the first direction x, and the length direction of the third outlet 131 also parallel to the first direction x. By designing both the first outlet 111 and the third outlet 131 as slits with their length direction parallel to the first direction x, the transparent material can better encapsulate the non-transparent material exiting through the multiple second outlets 121, thereby forming… Figure 9 The privacy film shown has a plurality of light-blocking strips 31 arranged along the first direction x covered by a first transparent layer 32 and a second transparent layer 33.

[0115] In summary, the film-forming equipment provided in this application includes a material bin and a stretching mechanism. After the first and third receiving cavities of the material bin both contain transparent material, and the second receiving cavity of the material bin contains non-transparent material, the stretching mechanism can stretch the transparent material exiting through the first and third discharge ports, as well as the non-transparent material exiting through multiple second discharge ports, to obtain a privacy film. The privacy film obtained in this way is not limited by the thickness of the substrate, thus allowing the privacy film formed by the film-forming equipment to be thinner, which is beneficial for the miniaturization of display devices.

[0116] This application also provides a method for manufacturing a privacy film, which is applied to any of the aforementioned film-forming devices, and the method includes:

[0117] After the first and third receiving cavities contain transparent materials and the second receiving cavity contains non-transparent materials, a stretching mechanism is used to stretch the transparent materials discharged from the first and third discharge ports, as well as the non-transparent materials discharged from multiple second discharge ports, to form a privacy film.

[0118] The privacy film includes: multiple light-blocking strips formed of non-transparent material, and a first transparent layer and a second transparent layer formed of transparent material distributed on both sides of the multiple light-blocking strips.

[0119] In summary, the film-forming equipment used in the method for manufacturing the privacy film provided in this application includes a material bin and a stretching mechanism. After the first and third receiving cavities of the material bin both contain transparent material, and the second receiving cavity of the material bin contains non-transparent material, the stretching mechanism can stretch the transparent material exiting through the first and third discharge ports, as well as the non-transparent material exiting through multiple second discharge ports, to obtain the privacy film. The privacy film obtained in this way is not limited by the thickness of the substrate, thereby allowing the privacy film formed by the film-forming equipment to be thinner, which is beneficial for the product thinning of display devices.

[0120] It should be noted that the terminology used in the implementation section of the embodiments of this application is only for explaining the embodiments of this application and is not intended to limit the embodiments of this application. Unless otherwise defined, the technical or scientific terms used in the implementation of the embodiments of this application should have the ordinary meaning understood by a person skilled in the art to which the embodiments of this application pertain. The words "first," "second," "third," and similar terms used in the patent application specification and claims of the embodiments of this application do not indicate any order, quantity, or importance, but are only used to distinguish different components. Similarly, the words "a" or "an" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The words "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The directional terms mentioned in the embodiments of this application, such as "top", "bottom", "up", "down", "left" or "right", are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0121] The above are merely optional embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A privacy film, characterized in that, The privacy film includes: a first transparent layer (32), a second transparent layer (33), and a plurality of light-blocking strips (31); The first transparent layer (32) and the second transparent layer (33) are stacked, and there are multiple bearing cavities (30) between the first transparent layer (32) and the second transparent layer (33). The plurality of light-shielding strips (31) correspond one-to-one with the plurality of carrying cavities (30), and the light-shielding strips (31) are located within the corresponding carrying cavities (30); The modulus of the light-shielding strip (31) is greater than that of the first transparent layer (32), and the modulus of the light-shielding strip (31) is greater than that of the second transparent layer (33), so that during the process of forming the privacy film by stretching, the material of the light-shielding strip (31) can support the material of the first transparent layer (32) and the material of the second transparent layer (33). The privacy film (3) has a first planar area (B) and a second planar area (D), and a bent area (C) located between the first planar area (B) and the second planar area (D); a plurality of light-blocking strips (31) are distributed in the first planar area (B), the second planar area (D) and the bent area (C); The light-shielding strip (31) includes: a substrate, and a plurality of non-transparent particles distributed in the substrate; the non-transparent particles are reflective metal particles or light-absorbing black particles; the substrate is made of a material that is easy to stretch; The bending area (C) has a bending axis (M), the bending axis (M) extending in a direction parallel to the length extension direction of the light-shielding strip (31), and the bending axis (M) is located between two adjacent light-shielding strips (31).

2. The privacy film according to claim 1, characterized in that, The modulus of the first transparent layer (32) is greater than that of the second transparent layer (33).

3. The privacy film according to claim 1, characterized in that, The privacy film (3) further includes a hardening layer (34) located on the side of the first transparent layer (32) away from the second transparent layer (33).

4. The privacy film according to claim 3, characterized in that, The hardened layer (34) is located within the first planar region and the second planar region, and the hardened layer (34) is located outside the bending region; The length extension direction of the bending area is parallel to the length extension direction of the light-shielding strip (31).

5. The privacy film according to any one of claims 1 to 4, characterized in that, The surface of the light-shielding strip (31) is in contact with the first transparent layer (32) and the second transparent layer (33) within the corresponding bearing cavity (30).

6. A film-forming device, characterized in that, The film-forming equipment is used to produce the privacy film (3) according to any one of claims 1-5. The film-forming equipment includes: a material box (1) and a stretching mechanism (2). The hopper (1) has a first receiving cavity (11), a second receiving cavity (12) and a third receiving cavity (13) that are separately arranged. The second receiving cavity (12) is distributed between the first receiving cavity (11) and the third receiving cavity (13). The first receiving cavity (11) has a first discharge port (111). The second receiving cavity (12) has a plurality of mutually spaced second discharge ports (121) arranged along a first direction. The third receiving cavity has a third discharge port (131). The first discharge port (111), the plurality of second discharge ports (121) and the third discharge port (131) are all distributed on the same side of the hopper (1). The first direction is perpendicular to the arrangement direction of the first receiving cavity (11), the second receiving cavity (12) and the third receiving cavity (13). The stretching mechanism (2) is located on one side of the material box (1) where the first discharge port (111), the plurality of second discharge ports (121) and the third discharge port (131) are distributed; The stretching mechanism (2) is configured to stretch the transparent material that is discharged through the first discharge port (111) and the third discharge port (131) and the non-transparent material that is discharged through the multiple second discharge ports (121) after the first receiving cavity (111) and the third discharge port (131) both carry transparent material and the second receiving cavity (121) carries non-transparent material, so as to form a privacy film (3). The privacy film (3) includes multiple light-blocking strips (31) formed by the non-transparent material, and a first transparent layer (32) and a second transparent layer (33) formed by the transparent material and distributed on both sides of the multiple light-blocking strips (31).

7. The film-forming equipment according to claim 6, characterized in that, The stretching mechanism (2) includes: a first roller group (21) and a second roller group (22); The first roller group (21) is located on one side of the material box (1) where the first discharge port (111), the plurality of second discharge ports (121) and the third discharge port (131) are distributed, and the second roller group (22) is arranged adjacent to the first roller group (21); The first roller group (21) is configured to perform initial film-forming treatment on transparent materials discharged through the first discharge port (111) and the third discharge port (131), and non-transparent materials discharged through the plurality of second discharge ports (121), to form an intermediate transition film layer. The second roller group (22) is configured to stretch the intermediate transition film layer to form the privacy film (3).

8. The film-forming equipment according to claim 7, characterized in that, The second roller group includes a first stretching roller pair (221) and a second stretching roller pair (222) arranged sequentially in the travel direction of the intermediate transition film layer, wherein the rotational speed of the rollers in the second stretching roller pair (222) is greater than the rotational speed of the rollers in the first stretching roller pair (221).

9. The film-forming equipment according to claim 7, characterized in that, The stretching mechanism (2) further includes a heating device (23) distributed between the first roller group (21) and the second roller group (22), the heating device (23) being configured to heat the portion to be heated in the intermediate transition film layer.

10. The film-forming equipment according to claim 7, characterized in that, The stretching mechanism (2) further includes a reversing roller (24) distributed between the first roller group (21) and the second roller group (22). The first roller group (21) includes: a first film-forming roller (211) disposed adjacent to the reversing roller (24), and a second film-forming roller (212) located on the side of the first film-forming roller (211) away from the reversing roller (24). The rotation direction of the reversing roller (24) is opposite to that of the first film-forming roller (211), and the rotation direction of the reversing roller (24) is the same as that of the second film-forming roller (212). The reversing roller (24) is configured to change the travel direction of the intermediate transition film layer.

Images