Optical composite film, backlight module and interactive display device

Abstract

This application relates to an optical composite film, a backlight module, and an interactive display device, including a dimming film layer. The dimming film layer comprises a first substrate layer and a UV adhesive structure. The UV adhesive structure is pressed onto the surface of the first substrate layer, and multiple dimming structures are formed on the UV adhesive structure. The multiple dimming structures are arranged side-by-side and spaced apart on the first substrate layer. The dimming structure has a polygonal cross-section, and the angles of the dimming structure are 33° to 63°, where the angle is the included angle formed by the surfaces of the two sides of the dimming structure along its width direction. A protective adhesive layer is coated on the UV adhesive structure, and the refractive index of the protective adhesive layer is lower than that of the UV adhesive structure. The above technical solution can achieve a stable and significant improvement in brightness over a wide viewing angle, while also balancing brightness over a wide viewing angle and brightness at a normal viewing angle.

Description

Technical Field

[0001] This application relates to the technical field of display devices, and in particular to an optical composite film, a backlight module, and an interactive display device. Background Technology

[0002] With the increasing popularity of interactive display devices, they are being used more and more in classrooms, conference rooms, and lecture halls. In these large-space, multi-person applications, viewers are often distributed over a wide area in front of the screen, and the ambient light is typically strong to meet the needs of writing and reading. This places higher demands on the brightness uniformity and resistance to ambient light interference of interactive display devices from different viewing angles.

[0003] When a viewer is directly facing the screen (approximately 0° viewing angle), the display device typically provides adequate brightness and contrast. However, as the viewing angle increases, screen brightness often decreases significantly. For example, in a classroom environment, students in side seats may have viewing angles exceeding 60°, at which point the perceived screen brightness may be less than 20% of that at the center viewing angle. Simultaneously, strong ambient light creates noticeable glare on the screen surface, further reducing visibility and making it difficult for side-viewers to clearly discern the displayed content, severely impacting information delivery.

[0004] It is evident that interactive display devices in related technologies have low brightness and poor viewing experience at wide viewing angles. Summary of the Invention

[0005] Therefore, it is necessary to provide an optical composite film, a backlight module, and an interactive display device to address the problem of low brightness and poor viewing effect of interactive display devices at wide viewing angles in related technologies.

[0006] A first aspect of this application provides an optical composite film comprising:

[0007] A dimming film layer includes a first substrate layer and a UV adhesive structure. The UV adhesive structure is pressed onto the surface of the first substrate layer, and multiple dimming structures are formed on the UV adhesive structure. The multiple dimming structures are arranged side by side and spaced apart on the first substrate layer. The cross-section of each dimming structure is a polygonal structure, and the angle of each dimming structure is 33° to 63°. The angle is the included angle formed by the two surfaces of the dimming structure along the width direction.

[0008] A protective adhesive layer is applied to the UV adhesive structure, and the refractive index of the protective adhesive layer is less than the refractive index of the UV adhesive structure.

[0009] When the aforementioned optical composite film 10 is applied in an interactive display device, it is located on the light-incident side of the display panel. Therefore, the light emitted from the light source first passes through the optical composite film 10 before entering the display panel. The light passes through a dimming structure with a polygonal cross-section in the optical composite film 10. This dimming structure refracts the light, guiding some of it towards the wide viewing angle, thus improving the brightness at the wide viewing angle. The light-incident side of the display panel faces inwards towards the interactive display device and is protected by other components (such as the back panel, diffuser plate, and rear shell). Furthermore, the light-incident side of the display panel is a non-operational side compared to the light-emitting side. Therefore, when the wide viewing angle film is placed on the light-incident side of the display panel, there is no need for complex bonding processes. This reduced process difficulty makes the production process of placing the wide viewing angle film on the light-incident side of the display panel more stable and yields higher results. This allows the light to accurately pass through the dimming structure according to the designed path and be accurately guided towards the wide viewing angle, thereby achieving a stable and significant improvement in brightness at the wide viewing angle. Moreover, the angles of the dimming structure are 33° to 63°, which can balance brightness at both the wide and normal viewing angles.

[0010] The technical solution of this application will be further described below:

[0011] In one embodiment, the cross-section of the dimming structure is a trapezoidal structure, the height H of the dimming structure is 5μm to 200μm, the bottom edge S is 1μm to 150μm, the top edge S1 is 0.2μm to 100μm, and the distance L between two adjacent dimming structures is 0μm to 200μm.

[0012] Alternatively, the dimming structure has a trapezoidal cross-section and a convex or concave arc surface. The height H of the dimming structure is 5μm to 200μm, the bottom edge S is 1μm to 150μm, the distance L between two adjacent dimming structures is 0μm to 200μm, and the radius a of the convex arc surface or the radius b of the concave arc surface is 0.2μm to 100μm.

[0013] Alternatively, the cross-section of the dimming structure is a composite structure of trapezoids superimposed with triangles, the total height H of the dimming structure is 2μm to 150μm, the height H1 of the trapezoidal structure is 2μm to 150μm, the first angle R1 is smaller than the second angle R2, the base S is 1μm to 150μm, and the distance L between two adjacent dimming structures is 0μm to 200μm.

[0014] In one embodiment, the dimming film layer further includes a first diffusion structure disposed on the side of the first substrate layer opposite to the dimming structure.

[0015] In one embodiment, the first diffusion structure is made by mixing a first optical adhesive and diffusion particles; wherein the weight ratio of the first optical adhesive to the diffusion particles is 100:(4-20).

[0016] In one embodiment, the dimming structure is a first microprism, and the connection between the first microprism and the first substrate layer is connected and transitioned by rounded corners or chamfers.

[0017] In one embodiment, at least two of the first microprisms are of equal height;

[0018] Alternatively, at least the heights of two adjacent first microprisms are not equal, and the height of the shorter of the two adjacent first microprisms is set as H2, and the height of the taller of the two adjacent first microprisms is set as H1, where H2 = (20% - 80%)H1.

[0019] In one embodiment, the first microprism has a second optical adhesive, the refractive index of which is greater than that of the protective adhesive layer.

[0020] In one embodiment, the first diffusion structure includes diffusion particles, which are composed of one or a mixture of at least two of PMMA particles, PBMA particles, SiO2 particles, and organosilicon sphere particles.

[0021] The PMMA particles have a particle size of 1 μm to 100 μm; the PBMA particles have a particle size of 1 μm to 100 μm; the SiO2 particles have a particle size of 1 μm to 100 μm; and the organosilicon spheres have a particle size of 1 μm to 100 μm.

[0022] In one embodiment, the first substrate layer is made of any one of polycarbonate, polyethylene terephthalate, polystyrene, polyethylene, and polymethyl methacrylate, and the thickness of the first substrate layer is 30 μm to 300 μm.

[0023] In one embodiment, the optical composite film further includes:

[0024] A base film layer, wherein the dimming film layer is disposed on one side of the base film layer, and the dimming structure is opposite to the base film layer and is oriented toward the light source; and

[0025] A prism film layer is disposed on the side of the base film layer away from the dimming film layer.

[0026] In one embodiment, the base film layer includes a substrate, a first adhesive layer, and a second adhesive layer. The first adhesive layer and the second adhesive layer are respectively disposed on opposite sides of the substrate. The first adhesive layer is bonded and fixed to the protective adhesive layer, and the second adhesive layer is bonded and fixed to the prism film layer.

[0027] In one embodiment, the optical composite film further includes a diffusion layer disposed on the side of the prism film layer away from the base film layer.

[0028] In one embodiment, the diffusion layer is a diffusion film or a diffusion sheet;

[0029] When the diffusion layer is a diffusion film, the diffusion film has a third microprism disposed toward the prism film layer and a second diffusion structure disposed away from the prism film layer.

[0030] In one embodiment, the height of the third microprism is 30μm to 70μm, and the angle is 85° to 105°.

[0031] A second aspect of this application also provides a backlight module comprising the optical composite film as described above.

[0032] A third aspect of this application also provides an interactive display device, comprising: a glass cover, a display panel, a light-emitting element, and an optical composite film as described in any of the above embodiments;

[0033] The glass cover is located above the light-emitting side of the display panel, and the glass cover has a concave surface that is recessed toward the display panel; and an anti-glare layer is also provided on the surface of the glass cover.

[0034] The optical composite film is disposed on the light-incident side of the display panel, and the light-emitting element is located on the light-incident side of the optical composite film;

[0035] The plurality of light-emitting elements are arranged in a matrix; or the interactive display device further includes a reflective sheet and a light guide plate, wherein the plurality of light-emitting elements are disposed on the outer periphery of the light guide plate, the reflective sheet is located on the side of the optical composite film close to the display panel, and the light guide plate is located between the reflective sheet and the optical composite film. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly described below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort. In the drawings:

[0037] Figure 1 This is a cross-sectional structural diagram of an interactive display device according to one embodiment.

[0038] Figure 2 This is a schematic diagram of the structure of an optical composite film according to one embodiment.

[0039] Figure 3 for Figure 2 A schematic diagram of the structure of the basic membrane layer.

[0040] Figure 4 This is a schematic diagram of an optical composite film using a diffuser.

[0041] Figure 5 This is a schematic diagram of an optical composite film using a diffusion film.

[0042] Figure 6 This is a schematic diagram of the structure of a dimming film layer according to one embodiment.

[0043] Figure 7 This is a schematic diagram of the structure of a dimming film layer coated with a protective adhesive layer.

[0044] Figure 8 This is a schematic diagram of the structure of the first microprism in the first embodiment.

[0045] Figure 9 This is a schematic diagram of the structure of the first microprism in the second embodiment.

[0046] Figure 10 This is a schematic diagram of the structure of the first microprism in the third embodiment.

[0047] Figure 11 This is a schematic diagram of the structure of the first microprism in the fourth embodiment.

[0048] Figure 12 This is a schematic diagram of the structure of the first microprism in the fifth embodiment.

[0049] Figure 13 This is a schematic diagram of the structure connecting the first microprism and the first substrate layer through a rounded corner transition.

[0050] Figure 14 This is a schematic diagram of the structure connecting the first microprism and the first substrate layer through a chamfered transition.

[0051] Figure 15 A schematic diagram of the arrangement of at least two first microprisms with non-uniform height design.

[0052] Figure 16 This is a schematic diagram of the structure of an optical composite film according to another embodiment.

[0053] Figure 17 for Figure 16 A schematic diagram of the parameters and dimensions of a microlens.

[0054] Figure 18 This is a schematic diagram of the structure of the prism film layer in one embodiment.

[0055] Figure 19 This is a schematic diagram of the dimming film layer in a more specific embodiment.

[0056] Figure 20 This is a schematic diagram of the structure of an optical composite film according to another embodiment.

[0057] Figure 21 This is a schematic diagram of the structure of an optical composite film according to another embodiment.

[0058] Figure 22 This is a schematic diagram of the structure of a polarizer assembly formed by connecting a first polarizer and a dimming film layer in one embodiment.

[0059] Figure 23 This is a schematic diagram of a first diffusion structure according to an embodiment.

[0060] Figure 24 This is a schematic diagram of the structure of an interactive display device according to one embodiment.

[0061] Figure 25 This is a schematic diagram of the structure of a large-viewing-angle module according to one embodiment.

[0062] Figure 26 This is one of the structural schematic diagrams of a wide-viewing-angle module after the backlight module has been removed, according to one embodiment.

[0063] Figure 27 This is the second schematic diagram of the structure of a wide-viewing-angle module after removing the backlight module, as shown in one embodiment.

[0064] Figure 28 This is a schematic diagram of the structure of a large-view module with a border, as shown in one embodiment.

[0065] Figure 29 This is a schematic diagram of the structure of a screen pressing component according to one embodiment.

[0066] Figure 30 This is a schematic diagram of the screen pressing component according to another embodiment.

[0067] Figure 31 This is a schematic diagram for measuring the brightness of the interactive display device in the embodiments of this application.

[0068] Figure 32 This is a schematic diagram of the structure of a roller pressing device according to one embodiment.

[0069] Figure 33 for Figure 32 A lateral view of the middle roller.

[0070] Figure 34 This is a schematic diagram of the structure of the rollers in another embodiment of the roller pressing device.

[0071] Figure 35 This is a schematic diagram of the structure of an optical film preparation apparatus according to an embodiment of this application.

[0072] Figure 36 This is a flowchart of an optical film preparation method according to an embodiment of this application.

[0073] Figure 37 This is a schematic diagram illustrating the production of a first-generation soft mold prototype using a roller pressing device according to an embodiment of this application.

[0074] Figure 38 This is a schematic diagram of the cutting position of a second-generation soft mold unit according to an embodiment of this application.

[0075] Figure 39 This is a schematic diagram of the splicing area of ​​two second-generation soft mold units according to an embodiment of this application.

[0076] Figure Labels

[0077] ZZ', First direction; XX', Second direction; YY', Third direction;

[0078] 100. Interactive display devices;

[0079] 10. Optical composite film;

[0080] 11. Base film layer; 111. Substrate; 112. First adhesive layer; 113. Second adhesive layer;

[0081] 12. Dimming film layer; 12a. Dimming structure; 121. First microprism; 122. First substrate layer; 123. First diffusion structure; 123a. Diffusion substrate; 123b. Scattering structure; 1231. Microlens; 1231a. Spherical arc surface; 1231b. Circular bottom surface; 124. Light-diffusing film; 125. Third adhesive layer;

[0082] 13. Prism film layer; 131. Second substrate layer; 132. Second microprism;

[0083] 14. Diffusion layer; 141. Third microprism; 142. Second diffusion structure;

[0084] 15. First polarizer;

[0085] 16. DBEF core layer;

[0086] 17. Second polarizer;

[0087] 18. Protective film;

[0088] 20. Rounded corners; 20a. Chamfered corners;

[0089] 30. Protective adhesive layer;

[0090] 40. Display panel; 41. Light-incident surface; 42. Light-emitting surface;

[0091] 50. Backlight module; 51. Back panel; 52. Light source; 53. Diffuser plate; 54. Reflector;

[0092] 60. Fixed frame;

[0093] 71. First adhesive; 72. Screen pressing component; 721. Hook part; 722. Connecting part; 73. Second adhesive;

[0094] 80. Border;

[0095] 90. Glass cover plate;

[0096] 200. Luminometer;

[0097] 310. Roller; 301. First strip groove; 320. Liquid injection device; 330. Curing device;

[0098] 410. Substrate film;

[0099] 510. Main roller; 520. Tensioning roller; 530. Pressure roller; 540. Liquid injection device; 550. Curing device; 560. Separating roller; 570. Pre-coating roller; 580. Liquid storage container; 590. Guide roller;

[0100] 600. First-generation soft mold; 610. First-generation soft mold prototype; 611. First soft mold base material;

[0101] 700, Second-generation soft mold; 710, Second-generation soft mold unit; 711, Second soft mold base material. Detailed Implementation

[0102] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

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

[0104] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0105] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0106] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0107] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0108] In related technologies, interactive display devices, to improve viewing experience at wide viewing angles, place a wide-viewing-angle film (WAN) on the light-emitting side of the liquid crystal display panel to enhance brightness. Since the light-emitting side of the liquid crystal display panel is closer to the external environment and is the user's operating side compared to the light-incident side, it must withstand potential external forces such as touch and cleaning during actual use. Therefore, the reliability and protection requirements for the light-emitting side of the liquid crystal display panel are higher. Consequently, when bonding the WAN to the light-emitting side of the liquid crystal display panel, not only accurate alignment is required, but also the uniformity of the adhesive layer, its strong adhesion, and its ability to withstand long-term stress must be ensured, significantly increasing the difficulty and complexity of the process.

[0109] In practice, improper control can easily lead to process defects such as misalignment of the large-viewing-angle film, uneven thickness of the optical adhesive layer, or inclusion of microparticles. These defects prevent light from passing through the microstructures in the large-viewing-angle film according to the designed path, thus preventing the light from being accurately guided in the large-viewing-angle direction. Therefore, even if a large-viewing-angle film is used in interactive display devices, it is difficult to achieve a stable and significant improvement in large-viewing-angle brightness.

[0110] Based on the aforementioned defects and shortcomings of the existing technology, this application provides an optical composite film 10, which, when applied in an interactive display device, is located on the light-incident side of the display panel. The light-incident side of the display panel faces inwards towards the interactive display device and is protected by other components (such as a back panel, diffuser plate, and rear shell). Furthermore, the light-incident side of the display panel is a non-operational side compared to the light-emitting side. Therefore, when the wide-viewing-angle film is placed on the light-incident side of the display panel, there is no need for complex bonding processes. Due to the reduced process difficulty, the production process of the wide-viewing-angle film on the light-incident side of the display panel is more stable and has a higher yield. This facilitates the accurate flow of light through the dimming structure along the designed path, ensuring it is precisely guided towards the wide-viewing-angle direction, thereby achieving a stable and significant improvement in brightness over a wide viewing angle. Moreover, the angles of the dimming structure are 33° to 63°, which can balance brightness over a wide viewing angle with brightness at a normal viewing angle.

[0111] By creating a UV adhesive structure for the dimming film layer 12 and shaping the UV adhesive structure to obtain a dimming structure 12a with a polygonal cross-section, and simultaneously coating a protective adhesive layer 30 on the dimming structure 12a, and making the refractive index of the protective adhesive layer 30 less than that of the UV adhesive structure, the propagation path and direction of light through the optical composite film 10 can be significantly improved, thereby ensuring sufficient light intensity at both zero-degree and wide-angle viewing angles, and ensuring that viewers can observe a clear image whether they are viewing the interactive display device 100 from a zero-degree or wide-angle viewing angle.

[0112] For ease of description of the embodiments of this application, the orientation is described below using a first direction ZZ', a second direction XX', and a third direction YY'. The first direction ZZ', the second direction XX', and the third direction YY' intersect each other. In some embodiments, the first direction ZZ', the second direction XX', and the third direction YY' are perpendicular to each other. In some embodiments, when actually using an optical composite film, the second direction XX' is vertical, the first direction ZZ' is horizontal and perpendicular to the display surface, and the third direction YY' is horizontal in a left-right direction.

[0113] Please see Figure 2 This application illustrates an optical composite film 10 according to an embodiment, which includes a base film layer 11, a dimming film layer 12, and a prism film layer 13. The base film layer 11 forms the basic structure of the optical composite film 10, used to mount and fix the dimming film layer 12 and the prism film layer 13. The base film layer 11, the dimming film layer 12, and the prism film layer 13 may be stacked along a first direction ZZ'.

[0114] Please continue reading. Figure 3 For example, in one embodiment, the base film layer 11 includes a substrate 111, a first adhesive layer 112, and a second adhesive layer 113, with the first adhesive layer 112 and the second adhesive layer 113 respectively disposed on opposite sides of the substrate 111. That is, the first adhesive layer 112 is disposed on one side of the substrate 111, and the second adhesive layer 113 is disposed on the other side of the substrate 111, with one side and the other side being two opposite sides of the substrate 111. In some embodiments, one side and the other side are two sides along the thickness direction of the substrate 111.

[0115] The first adhesive layer 112 is bonded and fixed to the dimming film layer 12, and the second adhesive layer 113 is bonded and fixed to the prism film layer 13.

[0116] The first adhesive layer 112 applies adhesive force to the dimming film layer 12 to bond and fix the dimming film layer 12 to the substrate 111, and the second adhesive layer 113 applies adhesive force to the prism film layer 13 to bond and fix the prism film layer 13 to the substrate 111, thereby achieving the bonding of the base film layer 11, the dimming film layer 12 and the prism film layer 13 into one unit. This bonding and installation method is simple to implement, reliable in connection, and will not affect the structural integrity of each film layer.

[0117] Furthermore, both the first adhesive layer 112 and the second adhesive layer 113 are made of optical adhesive. The optical adhesive is applied to the opposite two sides of the substrate 111, and the thickness of the optical adhesive after curing is 1μm to 2μm.

[0118] It should be noted that in other optional embodiments, the base film layer 11, the dimming film layer 12, and the prism film layer 13 can also be assembled and fixed using other mature installation methods in the prior art, which will not be elaborated here.

[0119] It should also be noted that the material used for the substrate 111 can be, but is not limited to, any one of polycarbonate (PC), polyethylene terephthalate (PET), polystyrene (PS), polyethylene (PE), and polymethyl methacrylate (PMMA); the substrate 111 will not interfere with the propagation of light, or will only cause the light to refract at a smaller angle.

[0120] Please continue reading. Figure 2 In this application, the dimming film layer 12 is disposed on one side of the base film layer 11, and the prism film layer 13 is disposed on the side of the base film layer 11 away from the dimming film layer 12.

[0121] In some embodiments, the dimming film layer 12 and the prism film layer 13 are installed on opposite sides of the base film layer 11 in the thickness direction, so as to achieve the stacking of the dimming film layer 12, the base film layer 11 and the prism film layer 13.

[0122] The dimming film layer 12 includes a first substrate layer 122 and a UV adhesive structure. The UV adhesive structure is pressed onto the surface of the first substrate layer 122, and a plurality of dimming structures 12a are formed on the UV adhesive structure. The plurality of dimming structures 12a are arranged side by side and spaced apart on the first substrate layer 122. The cross-section of the dimming structure 12a is a polygonal structure.

[0123] In addition, the optical composite film 10 also includes a protective adhesive layer 30, which is coated on the UV adhesive structure, and the refractive index of the protective adhesive layer 30 is less than the refractive index of the UV adhesive structure.

[0124] In some embodiments, the dimming structure 12a is located on the side of the first substrate layer 122 near the base film layer 11.

[0125] In some embodiments, the dimming structure 12a gradually narrows along the direction of the dimming structure 12a near the base film layer 11.

[0126] The angle of the dimming structure is between 33° and 63°, where the angle is the included angle between the two surfaces of the dimming structure along its width. The angle of the dimming structure determines the angle at which light is deflected after passing through its side. If the angle is less than 33°, the light deflection direction is too close to the normal, resulting in limited gain at wide viewing angles; if the angle is greater than 63°, total internal reflection or stray light is likely to occur at the interface, leading to a significant decrease in usable brightness at the front viewing angle. Setting the angle R in the range of 33° to 63° can balance brightness at both wide and front viewing angles.

[0127] When the aforementioned optical composite film is used, when the light emitted by the light source 52 passes through the dimming film layer 12, a UV adhesive structure is formed on the first substrate layer 122, and the UV adhesive structure includes multiple dimming structures 12a arranged side by side at intervals. The cross-section of the dimming structure 12a is a polygonal structure, which allows the dimming structure 12a to refract the light. Furthermore, since a protective adhesive layer 30 is coated on the UV adhesive structure, in addition to providing basic protection for the UV adhesive structure, the protective adhesive layer 30 also allows the light to be further refracted when it passes through the protective adhesive layer 30 because its refractive index is lower than that of the UV adhesive structure. This effectively increases the propagation direction and angle range of the refracted light, thereby achieving the effect of controlling the light intensity of the light source 52 at various angles. This enhances the light intensity of the light emitted from a large viewing angle, ensuring that viewers can see clear images and text when observing the interactive display device from a large angle at an oblique angle, while avoiding weakening the light intensity at a zero-degree viewing angle.

[0128] When the aforementioned optical composite film 10 is applied in an interactive display device, it is located on the light-incident side of the display panel. Therefore, the light emitted from the light source first passes through the optical composite film 10 before entering the display panel. The light passes through a dimming structure with a polygonal cross-section in the optical composite film 10. This dimming structure refracts the light, guiding some of it towards the wide viewing angle, thus improving the brightness at the wide viewing angle. The light-incident side of the display panel faces inwards towards the interactive display device and is protected by other components (such as the back panel, diffuser plate, and rear shell). Furthermore, the light-incident side of the display panel is a non-operational side compared to the light-emitting side. Therefore, when the wide viewing angle film is placed on the light-incident side of the display panel, there is no need for complex bonding processes. This reduced process difficulty makes the production process of placing the wide viewing angle film on the light-incident side of the display panel more stable and yields higher results. This allows the light to accurately pass through the dimming structure according to the designed path and be accurately guided towards the wide viewing angle, thereby achieving a stable and significant improvement in brightness at the wide viewing angle. Moreover, the angles of the dimming structure are 33° to 63°, which can balance brightness at both the wide and normal viewing angles.

[0129] It should be noted that when the protective adhesive layer 30 is applied to the UV adhesive structure, the first adhesive layer 112 is specifically bonded to the protective adhesive layer 30 to bond and fix the base film layer 11 and the dimming film layer 12.

[0130] In summary, implementing the technical solution of this embodiment will achieve the following beneficial effects: The optical composite film 10 of this solution is installed and used in the backlight module 50 of the interactive display device 100, wherein the base film layer 11 is used to install the integrated dimming film layer 12 and the prism film layer 13. After the optical composite film 10 is installed in conjunction with the light source 52, it is necessary to ensure that the dimming structure 12a of the dimming film layer 12 is oriented towards the light source 52. In this way, on the one hand, when the light emitted by the light source 52 passes through the dimming film layer 12, the dimming structure 12a can refract the light, thereby increasing the propagation direction and angle range of the refracted light, so as to achieve the effect of controlling the light intensity of the light source 52 at various angles. As a result, the light intensity of light emitted from a wide viewing angle is enhanced, ensuring that viewers can see clear images and text even when observing the interactive display device 100 from a wide angle. On the other hand, when light passes through the prism film layer 13, the total internal reflection of the prism allows the light propagating at a wide angle to be reused, thereby enhancing the light intensity at a zero-degree viewing angle. In summary, the optical composite film 10 of this solution can increase the light intensity at a wide viewing angle while avoiding the reduction in light intensity at a zero-degree viewing angle, thus effectively ensuring that viewers can see clear images whether observing the interactive display device 100 from a zero-degree or wide viewing angle, improving the user experience.

[0131] In some embodiments, a plurality of dimming structures 12a are arranged sequentially along the third direction YY'. The dimming structures 12a can divert and diffuse light to both sides of the third direction YY', thereby improving the display brightness when a viewer views the display from the third direction YY' (left-right direction).

[0132] Please continue reading. Figure 4 and Figure 5 Based on the above embodiments, the optical composite film 10 further includes a diffusion layer 14, which is disposed on the side of the prism film layer 13 away from the base film layer 11. By providing the diffusion layer 14, light can be further refracted and diffused to make the light distribution more uniform and ensure sufficient light intensity at zero-degree and wide-angle viewing angles.

[0133] For example, in one embodiment, the diffusion layer 14 is a diffusion film or a diffusion sheet. Using a diffusion film or diffusion sheet structure for the diffusion layer 14 is easy to implement and makes the assembly of the optical composite film 10 simpler, with lower manufacturing costs and difficulty.

[0134] Please continue reading. Figure 6In addition, based on any of the above embodiments, the dimming film layer 12 further includes a first diffusion structure 123. The dimming structure 12a is disposed on the side of the first substrate layer 122 facing the base film layer 11, and the first diffusion structure 123 is disposed on the side of the first substrate layer 122 away from the base film layer 11.

[0135] The first substrate layer 122 serves to mount the integrated dimming structure 12a and the first diffusion structure 123. The dimming structure 12a is positioned facing the base film layer 11. This serves two purposes: firstly, the base film layer 11 can cover the dimming structure 12a, protecting it; secondly, after the optical composite film 10 is installed, the dimming structure 12a is positioned facing the light source 52, ensuring that the light emitted from the light source 52 is refracted when passing through the dimming structure 12a, adjusting the light intensity at various angles, and achieving a clear image from different viewing angles.

[0136] The first diffusion structure 123 is actually installed on the light-emitting side of the optical composite film 10. When light passes through the first diffusion structure 123, the light can be further refracted and diffused to make the light distribution more uniform and avoid the phenomenon of sudden brightness changes, which would affect the display effect of the interactive display device 100.

[0137] It should also be noted that after the light passes through the dimming structure 12a, it must then propagate through the first diffusion structure 123 to achieve uniform light distribution. The key reason for this is that when a viewer looks at the interactive display device 100, the angles at the center and the edges are different. When the angle difference is too large, it will cause uneven brightness for the user, resulting in a poor experience. While the light passing through the dimming structure 12a may have a large brightness difference at different viewing angles, the further adjustment by the first diffusion structure 123 can make the brightness curve smoother.

[0138] In one embodiment of this application, the first substrate layer 122 is made of any one of polycarbonate (PC), polyethylene terephthalate (PET), polystyrene (PS), polyethylene (PE), and polymethyl methacrylate (PMMA), and the thickness of the first substrate layer 122 is 30 μm to 300 μm. This allows for flexible processing and manufacturing of the first substrate layer 122, enabling the production of various thicknesses within this range, thereby creating a series of products with different specifications to meet diverse application needs.

[0139] In one embodiment, the first diffusion structure 123 includes diffusion particles, which are composed of one or a mixture of at least two of PMMA particles, PBMA particles, SiO2, and organosilicon spheres. This simplifies the structure and manufacturing process of the diffusion particles.

[0140] In some embodiments, the particle size of the diffused particles is 1 μm to 100 μm.

[0141] When the particle size of the diffused particles is significantly less than 1μm, the scattering of visible light by these particles enters the Rayleigh scattering dominance region. This results in a disproportionate increase in the scattering intensity of short-wavelength blue light, easily leading to color shift in the display. Simultaneously, the high particle concentration required for effective diffusion causes light loss and haze, resulting in a washed-out screen and a sharp decrease in frontal brightness. Conversely, when the particle size of the diffused particles is significantly greater than 100μm, their adjustment of light is limited to simple geometric blocking and reflection, failing to achieve precise large-angle diffusion. Instead, it creates noticeable micro-shadows and abrupt changes in the light path within the film layer, becoming new sources of brightness unevenness and completely disrupting the smoothness and uniformity of the viewing angle. A particle size range of 1μm to 100μm places the diffused particles precisely in the synergistic region of Mie scattering and geometric scattering, effectively controlling the light path while maintaining color balance and uniformity, thus effectively enhancing brightness over large viewing angles while maintaining brightness at the frontal viewing angle.

[0142] Among them, the particle size of PMMA particles is 1μm to 100μm; the particle size of PBMA particles is 1μm to 100μm; the particle size of SiO2 particles is 1μm to 100μm; and the particle size of organosilicon spheres is 1μm to 100μm.

[0143] It should be noted that the above-mentioned particles can be solid spheres or hollow spheres, and can be selected flexibly according to actual needs.

[0144] In one embodiment, the first diffusion structure 123 is made by mixing a first optical adhesive and diffusion particles; wherein the weight ratio of the first optical adhesive to the diffusion particles is 100:(4-20).

[0145] In the above embodiments, the lower limit of the weight percentage of diffusing particles is 4 parts, ensuring the minimum effective concentration of diffusing particles. If there are too few diffusing particles, there are insufficient scattering points, resulting in weak light diffusion and an inability to effectively increase brightness at wide viewing angles and eliminate moiré patterns. The upper limit of the weight percentage of diffusing particles is 20 parts, which prevents excessive diffusing particles. Too many diffusing particles can lead to excessive haze, causing excessive light scattering and severe loss of brightness at the front viewing angle. Designing the weight percentage of diffusing particles to be between 4 and 20 parts ensures both effective light scattering to improve brightness at wide viewing angles and avoids severe loss of brightness at the front due to excessive haze, thus balancing brightness at both the front and wide viewing angles.

[0146] The first optical adhesive and the diffusion particles are mixed in the above weight ratio, which not only ensures that the amount of the first optical adhesive is sufficient to fully bond the diffusion particles to form a stable first diffusion structure 123, but also ensures that the first diffusion structure 123 is firmly bonded to the first substrate layer 122. In addition, the amount of diffusion particles used is reasonable and the distribution is uniform, which plays a good role in refracting light so that the light is evenly distributed.

[0147] For example, the first optical adhesive may be composed of one or a mixture of two of polyurethane adhesive or epoxy resin, with a refractive index between 1.40 and 1.65.

[0148] The preparation methods of the first diffusion structure 123 mainly include the following two processes: the first is to mix the first optical adhesive with diffusion particles and then cure it by UV lamp irradiation, so that it is attached to the surface of the first substrate layer 122; the second is to mix the first optical adhesive, diffusion particles and solvent, and then evaporate the solvent in a high-temperature furnace while thermally curing or drying the first optical adhesive into a film, thereby leaving the cured first optical adhesive on the surface of the substrate 111 and having diffusion particles dispersed inside it.

[0149] In another embodiment of this application, the dimming structure 12a is a first microprism 121; in some embodiments, the first microprism 121 is a multi-prism. Specifically, the first microprism 121 is a microstructure formed by pressing UV adhesive onto the surface of the first substrate layer 122 through a roller mold and then curing it by UV lamp irradiation.

[0150] In some embodiments, the length direction of the first microprism 121 is along the second direction YY'.

[0151] Please continue reading. Figures 8 to 12 Multiple first microprisms 121 are provided and arranged side-by-side at intervals on the first substrate layer 122. The first microprisms 121 in this application include, but are not limited to, the following structural forms:

[0152] The cross-section of the first microprism 121 is triangular: the height H of the first microprism 121 is 5μm to 200μm, the base S is 1μm to 150μm, and the distance L between two adjacent first microprisms 121 is 0μm to 200μm. For example... Figure 8 As shown, for the first microprism 121 with a triangular cross-section, its angle R is the included angle between the two sides of the first microprism 121 along the width direction.

[0153] The first microprism 121 has a trapezoidal cross-section, with a height H of 5 μm to 200 μm, a base S of 1 μm to 150 μm, and a top S1 of 0.2 μm to 100 μm. The distance L between two adjacent first microprisms 121 is 0 μm to 200 μm. The surface corresponding to the top S1 is a plane, parallel to the plane corresponding to the bottom S.

[0154] The first microprism 121 has a trapezoidal cross-section and is provided with a convex or concave arc surface. The height H of the first microprism 121 is 5μm to 200μm, the base S is 1μm to 150μm, the distance L between two adjacent first microprisms 121 is 0μm to 200μm, and the radius a of the convex arc surface or the radius b of the concave arc surface is 0.2μm to 100μm.

[0155] like Figures 9 to 11 As shown, for the first microprism 121 with a trapezoidal cross-section, its angle R is the included angle between the extended surfaces of the two sides of the first microprism 121 along the width direction. Figures 9 to 11 The angle between the extensions of the two legs of the trapezoidal structure is shown in the trapezoidal cross section.

[0156] The cross-section of the first microprism 121 is a composite structure of trapezoids superimposed with triangles. In this case, the total height H of the first microprism 121 is 2μm to 150μm, the height H1 of the trapezoidal structure is 2μm to 150μm, the first angle R1 is smaller than the second angle R2, the base S is 1μm to 150μm, and the distance L between two adjacent first microprisms 121 is 0μm to 200μm. For the composite structure with a cross-section of trapezoids superimposed with triangles, the first angle R1 is the angle between the extended surfaces of the two sides of the trapezoidal structure, and the second angle R2 is the angle between the two sides of the triangular structure. The range of the first angle R1 can be 33° to 50°, and the range of the second angle R2 can be 43° to 63°.

[0157] In use, when the light emitted by the light source 52 passes through the dimming film layer 12, the first microprism 121, which has a trapezoidal cross-section, a trapezoidal structure with a convex or concave arc surface, or a composite structure of trapezoids and triangles, can refract the light, thereby increasing the propagation direction and angle range of the refracted light. This achieves the effect of controlling the light intensity of the light source 52 at various angles, enhancing the light intensity of the light emitted from a wide viewing angle, and ensuring that viewers can see clear images and text when observing the interactive display device 100 from a wide angle.

[0158] It should be noted that the cross-section of the first microprism 121 is a composite structure of trapezoids and triangles. Specifically, the cross-section of the part of the first microprism 121 that is directly connected to the first substrate layer 122 is trapezoidal, and the cross-section of the remaining part of the first microprism 121 that is away from the first substrate layer 122 is triangular, and the triangular part is connected to the trapezoidal part.

[0159] The height H of the first microprism 121 affects the optical path length of light propagating within it, thus determining the sufficiency of the refraction effect. If the height is less than 5 μm, the optical path length is too short, the light deflection effect is weak, and it is difficult to achieve effective large-angle control. If the height exceeds 200 μm, it will result in an excessively thick film layer, which not only increases material costs but also makes the precision roll forming process difficult, affecting mass production yield. In addition, the first microprism 121 is specifically a microstructure formed by pressing UV adhesive onto the surface of the first substrate layer 122 through a roller mold and then curing it under UV light. If the height is less than 5 μm, the size is too small and it is difficult to form using a mold. Therefore, in the above embodiment, the height H of the first microprism 121 is set in the range of 5 to 200 μm, which ensures that the first microprism 121 has a sufficient optical path length to guarantee the effect of large-angle control while also ensuring high process feasibility.

[0160] The width of the base edge S of the first microprism 121 affects its structural stability and the range of control over incident light. If the base edge S is less than 1 μm, the structure is too fragile and easily damaged, and it is difficult to mold. Moreover, it results in an excessively narrow light beam that the first microprism 121 can control. If the base edge S of the first microprism 121 exceeds 150 μm, the number of first microprisms 121 that can be arranged per unit area on the first substrate layer 122 is significantly reduced, which weakens the overall light control capability of the film layer. Setting the base edge S in the range of 1 μm to 150 μm can maintain a high array density of the first microprism 121 while ensuring the mechanical strength of the structure and sufficient optical working area.

[0161] In some embodiments, the angle R of the first microprism 121 is 48°. On the one hand, the angle R of 48° avoids insufficient brightness at a wide viewing angle due to insufficient light refraction angle caused by an excessively small angle, thereby ensuring sufficient brightness at a wide viewing angle. On the other hand, when the angle R is 48°, it will not cause significant total internal reflection or form stray light, thereby significantly reducing light loss at the positive viewing angle and ensuring brightness at the positive viewing angle.

[0162] Considering that there may be processing errors when processing the first microprism 121, the edge angle R of the first microprism 121 obtained after processing may not be strictly guaranteed to be 48°. Therefore, 48°±15° can be used as the preferred value of the edge angle R, that is, the edge angle R can be 33°~63°.

[0163] The spacing L of the first microprisms 121 controls the proportion of light that is modulated. If the spacing is 0 (closely packed), all light is processed by the first microprisms 121, resulting in the strongest brightening effect. However, since all light is guided to a specific angle by the multiple arrayed first microprisms 121, it is easy to form alternating bright and dark stripes, disrupting the continuity of brightness and leading to uneven brightness. If the spacing of the first microprisms 121 exceeds 200 μm, too much light passes directly without being modulated by the first microprisms 121, which will significantly weaken the brightening effect of the film at a wide viewing angle. Setting the spacing L of the first microprisms 121 in the range of 0 to 200 μm allows designers to flexibly adjust the intensity of light processing according to actual optical requirements to achieve an ideal brightness distribution.

[0164] In the above embodiments, the appropriate base width S and height H of the first microprism 121 together constitute the basic structure and optical path space required for light control; the appropriate prism angle R provides a suitable deflection direction and angle for the optical path; and the appropriate spacing L adjusts the proportion of light processed, thereby finely controlling the distribution of output brightness. These parameters work together to solve the problems of how to effectively collect light, precisely control its path, and rationally distribute light energy between the normal viewing angle and the wide viewing angle in the wide viewing angle enhancement design, while taking into account the feasibility of mass production processes. Thus, without significantly reducing the brightness of the normal viewing angle and the production yield, it achieves efficient guidance of light energy to the wide viewing angle region.

[0165] In some embodiments, the spacing between two adjacent dimming structures 12a is greater than or equal to 0 μm and less than or equal to 50 μm, and the height of the dimming structure 12a is greater than or equal to 20 μm and less than or equal to 150 μm. This embodiment further defines the spacing and height of the dimming structures 12a. By further optimizing the spacing and height of the dimming structures 12a, the dimming film layer can achieve better optical effects at wide viewing angles. Specifically, at a viewing angle of 60° to the side of the interactive display device (the angle between the viewer's line of sight and the display surface of the display panel is 30°), the brightness is not less than 1 / 3 of the brightness at a normal viewing angle (the viewer's line of sight is perpendicular to the display surface of the display panel). Therefore, it can be better ensured that people in a wide viewing angle area can clearly see the displayed content of the interactive display device.

[0166] In some embodiments, the two side surfaces of the first microprism 121 are symmetrical planes. When the cross-section of the first microprism 121 is a triangular structure, that is, the cross-section of the first microprism 121 is an isosceles triangle; when the cross-section of the first microprism 121 is a trapezoidal structure, that is, the cross-section of the first microprism 121 is an isosceles trapezoid; when the cross-section of the first microprism 121 is a composite structure of trapezoids and triangles, that is, the trapezoidal part is an isosceles trapezoid and the triangular part is an isosceles triangle.

[0167] By designing the two surfaces of the first microprism 121 to be symmetrical, the light refracted by the first microprism 121 can be distributed as evenly as possible in the left-right direction, and the inclination of the light rays tilting towards the left and right sides of the first microprism 121 after refraction can be as similar as possible. In this way, the brightness is basically uniform whether viewed from the left or right side of the display screen.

[0168] Ideally, the first microprism 121 with a triangular cross-section can achieve the most effective refraction of light with its sharp edges and complete side surfaces, thereby enhancing brightness over a wide viewing angle. However, in actual manufacturing, mold precision, material properties, and demolding processes make it difficult to shape the edges of the first microprism 121 into an ideal sharp-angled structure. Usually, the edges of the first microprism 121 are formed into a plane (corresponding to S1 above) or an arc surface (such as the convex arc surface / concave arc surface mentioned above).

[0169] The above embodiment controls the length of the upper S1 and the radius of curvature of the convex / concave arc surface within a very small range of 0.2μm to 100μm, which provides tolerance space for the mold forming process, reduces the processing difficulty and improves the production yield. At the same time, it also prevents the effective refractive surface of the first microprism 121 from being too small due to the excessive size of the upper S1 / convex arc surface / concave arc surface, thus ensuring that the function of the light refractive surface is basically complete and effectively ensuring the full improvement of brightness over a wide viewing angle.

[0170] Please continue reading. Figure 13 and Figure 14 Furthermore, considering ease of demolding during processing, the connection between the first microprism 121 and the first substrate layer 122 is achieved through a fillet 20 or a chamfer 20a. The radius of the fillet 20 is set to r, which is 0.2 μm to 100 μm. The height of the chamfer 20a is h, which is 5 μm to 50 μm.

[0171] In the above embodiments, a value of r of 0.2μm to 100μm or h of 5μm to 50μm facilitates demolding without significantly altering the optical path of the main body of the first microprism 121. A transition that is too small (e.g., r < 0.2μm or h < 5μm) has almost no effect on improving demolding; while a transition that is too large (e.g., r > 100μm or h > 50μm) alters the geometry and area of ​​the effective working surface of the first microprism 121, interfering with the light refraction angle and affecting the brightening effect at a wide viewing angle. When r is 0.2μm to 100μm or h is 5μm to 50μm, the stress during mold separation is smoothed, avoiding demolding damage, without substantially changing the side tilt angle and area of ​​the first microprism 121. This accurately ensures the light refraction path and efficiency, resulting in each mass-produced first microprism 121 possessing good manufacturability while maintaining optical performance highly consistent with the theoretical design.

[0172] Furthermore, in one embodiment, at least two of the plurality of first microprisms 121 arranged side by side have the same height. In some embodiments, all the first microprisms 121 have the same height.

[0173] In some embodiments, the plurality of first microprisms 121 are arranged in an array structure (such as a rectangular array structure, a circular array structure, etc.), and the height of each first microprism 121 is equal, which facilitates manufacturing and reduces processing difficulty.

[0174] Please continue reading. Figure 15 Considering that other films may be adsorbed on the surface of the dimming film layer 12, for example, when the dimming film layer 12 is connected to the substrate 111 through the first adhesive layer 112, the first microprism 121 will be bonded to the first adhesive layer 112. In some embodiments, among the plurality of first microprisms 121 arranged side by side, at least two adjacent first microprisms 121 have different heights.

[0175] For multiple first microprisms 121 of unequal height, the top of the taller first microprism 121 can bond with the first adhesive layer 112, ensuring a strong connection between the first microprism 121 and the first adhesive layer 112; while the shorter first microprism 121 can be suspended, thus preventing the top of the shorter first microprism 121 from being filled or flattened by the first adhesive layer 112 and causing physical damage. This maximizes the protection of the effective refractive surface of the shorter first microprism 121, allowing light to be more fully deflected when passing through the shorter first microprism 121, reducing light scattering or energy loss, and ultimately helping to achieve and maintain the preset large-viewing-angle brightening effect to a greater extent. At the same time, the staggered height of the first microprisms 121 avoids large-area uniform contact between film layers, reducing the risk of adsorption force and interference fringes, making the bonding between multiple film layers smoother and more stable.

[0176] Understandably, in the above embodiments, the dimming film layer 12 is connected to the substrate 111 via the first adhesive layer 112, and the combination of the first microprism 121 and the first adhesive layer 112 is only one example. In other embodiments, if the dimming film layer 12 is connected to other film layers, the first microprism 121 can also be combined with other functional layers. By designing multiple first microprisms 121 with unequal heights, the above-mentioned beneficial effects are still achieved.

[0177] In some embodiments, the height of the shorter of two adjacent first microprisms 121 is set as H2, and the height of the taller of two adjacent first microprisms 121 is set as H1, where H2 = (20% - 80%)H1.

[0178] For example, this application shows three first microprisms 121 of height H2 arranged between two adjacent first microprisms 121 of height H1. That is, two or more first microprisms 121 of height H2 can be arranged consecutively on one side of the first microprism 121 of height H1.

[0179] If H2 is less than 20% of H1, the height difference between the taller and shorter first microprisms 121 will be too large, resulting in the shorter first microprism 121 being too small. Its contribution to the wide viewing angle will be significantly weakened, which is detrimental to improving brightness over a wide viewing angle. Conversely, if H2 exceeds 80% of H1, their heights will be too close, making it difficult for the shorter first microprism 121 to reliably form a stable suspended state. The optical working surface of the shorter first microprism 121 will still easily come into contact with the first adhesive layer and be interfered with.

[0180] Therefore, the ratio of 20% to 80% ensures that the shorter first microprism 121 (H2) has a sufficiently high effective working surface to guarantee sufficient wide-viewing-angle brightening function, while being reliably protected by the taller first microprism 121 (H1). This prevents the shorter first microprism 121 from having its top portion damaged by the first adhesive layer, thereby maximizing the retention of the optical functions of both the taller and shorter first microprisms 121 while maintaining the overall stability of the film structure, and fully enhancing the overall brightening effect of the wide-viewing-angle.

[0181] Please see Figure 16 and Figure 18 In one embodiment, the prism film layer 13 includes a second substrate layer 131 and a plurality of second microprisms 132. The plurality of second microprisms 132 are disposed on the side of the second substrate layer 131 facing the base film layer 11. The second substrate layer 131 serves as a carrier for the second microprisms 132.

[0182] In some embodiments, the second microprism 132 gradually narrows along the side of the second microprism 132 close to the base film layer 11.

[0183] In some embodiments, a plurality of second microprisms 132 are arranged sequentially along a second direction XX'. The second microprisms 132 can converge light along the second direction XX' towards the horizontal direction, thereby making the light as close as possible to the perpendicularity of the display surface, and thus enhancing the brightness of the light in the horizontal direction. In some embodiments, the length direction of the second microprisms 132 is along a third direction YY'.

[0184] In some embodiments, the second microprism 132 can be prepared by pressing UV adhesive onto the surface of the second substrate layer 131 using a roller mold, and then curing it by UV lamp irradiation.

[0185] In some embodiments, the second substrate layer 131 is made of any one of polycarbonate (PC), polyethylene terephthalate (PET), polystyrene (PS), polyethylene (PE), and polymethyl methacrylate (PMMA), and the thickness of the second substrate layer 131 is 30 μm to 300 μm. This allows for flexible processing and manufacturing of the second substrate layer 131, enabling the production of various thicknesses within this range, and further enabling the creation of a series of products with different specifications to meet diverse application requirements.

[0186] Please continue reading. Figure 5 In one embodiment, when the diffusion layer 14 is a diffusion film, the diffusion film has a third microprism 141 disposed toward the prism film layer 13 and a second diffusion structure 142 disposed away from the prism film layer 13. In some embodiments, a plurality of third microprisms 141 disposed side by side in the diffusion film are arranged sequentially along a third direction YY'. The length direction of the third microprism 141 is along the second direction XX'.

[0187] As is easily understood, the third microprism 141 not only enhances the light but also refracts some of the light irregularly to atomize the light source 52; the second diffusion structure 142 also atomizes the light to make the light distribution more uniform and improve the light effect.

[0188] For example, in one embodiment, the height of the third microprism 141 is 30μm to 70μm; for example, 30μm, 40μm, 50μm, 60μm, 70μm, etc. The angle of the third microprism 141 is 85° to 105°, for example, 85°, 88°, 92°, 95°, 105°, etc. In this way, a series of optical composite film 10 products can be formed to meet the installation and use needs of different interactive display devices 100.

[0189] The height of the third microprism 141 affects the optical path length and refraction of incident light within it. If the height is less than 30 μm, the structure is too short, making it difficult to effectively collect and redistribute the original wide-angle light from the light source 52, resulting in insufficient collection capacity and limited homogenization effect. If the height exceeds 70 μm, the thickness of the diffusion film will be unnecessarily increased, while also increasing the difficulty of the molding process and affecting mass production efficiency and cost. Therefore, setting the height of the third microprism 141 in the range of 30 to 70 μm provides sufficient optical path length, ensuring effective homogenization and regularization of the light, while also reducing the difficulty of the manufacturing process and ensuring the compactness of the overall structure.

[0190] The angle of the third microprism 141 directly determines the inclination of its two inclined surfaces, thus controlling the intensity and direction of light refraction. If the angle is less than 85°, the inclination of the third microprism 141 is too steep, resulting in an excessively large angle of light refraction. While this can improve local brightness, it can also lead to uneven light spots, hindering further control of the optical path by subsequent film layers. If the angle is greater than 105°, the inclination of the third microprism 141 is too gentle, resulting in insufficient light refraction and difficulty in effectively converging wide-angle light from the light source, thus failing to provide an ideal light distribution for subsequent optical paths. Setting the angle between 85° and 105° provides sufficient refraction to regulate and homogenize the incident light, improving its angular distribution, while avoiding excessive intervention and leaving necessary control space for downstream optical film layers (especially the second microprism responsible for focusing and brightening).

[0191] By designing the height of the third microprism 141 to be 30-70 μm and the angle to be 85°-105°, the appropriate height provides the necessary spatial depth for processing light, while the suitable angle range gives it moderate refractive power. The combination of these two features allows the third microprism 141 to effectively collect, converge, and homogenize the initially dispersed light emitted from the light source, transforming it into a more concentrated and uniform intermediate light field. This creates an ideal light distribution for the downstream second microprism responsible for focusing and brightening, improving optical efficiency and light output quality.

[0192] Furthermore, considering that the first microprism 121 is easily worn and damaged, thereby affecting its ability to refract light, in one embodiment, a protective adhesive layer 30 is applied to the side of the first substrate layer 122 opposite to the first diffusion structure 123, and the protective adhesive layer 30 covers the first microprism 121.

[0193] In other words, the first microprism 121 is covered by the cured protective adhesive layer 30, which acts as a protective layer to prevent the first microprism 121 from being directly contacted and worn by external objects. The protective adhesive layer 30 is formed by coating, which is simple to manufacture, highly feasible, and low in cost.

[0194] Furthermore, the first microprism 121 incorporates a second optical adhesive, the refractive index of which is greater than that of the protective adhesive layer 30. Thus, the protective adhesive layer 30 and the second optical adhesive can refract light at different angles, resulting in a wider light diffusion angle and more uniform distribution. This balances the light intensity at both zero-degree and wide-angle viewing angles, ensuring that viewers at different distances in front of the interactive display device 100 can observe a clear image.

[0195] By making the refractive index of the second optical adhesive greater than that of the protective adhesive layer 30, when light enters the interior of the first microprism 121 made of the second optical adhesive from the protective adhesive layer 30, the propagation direction converges towards the normal direction. This significantly reduces the total internal reflection loss caused by excessive incident angle, allowing more large-angle light energy to enter the effective working area of ​​the first microprism 121. On the other hand, it also makes the angle distribution of light more concentrated and orderly before reaching the tilted side of the first microprism 121. Thus, when light is refracted on the tilted side of the first microprism 121, it can be deflected to the target's large angle direction more efficiently and accurately, while reducing the generation of stray light.

[0196] During the manufacturing of the first microprism 121, UV adhesive is first pressed onto the surface of the first substrate layer 122 using a roller mold, and then cured by UV light. The UV adhesive used is the second optical adhesive.

[0197] For example, the refractive index of the protective adhesive layer 30 is 1.40 to 1.65. The refractive index of the second optical adhesive is 1.40 to 1.65.

[0198] Please continue reading. Figure 1 In addition to the above, this application also provides an interactive display device 100, which includes a display panel 40, a backlight module 50, a fixing frame 60, etc., and the backlight module 50 includes the optical composite film 10 as described in any of the above embodiments.

[0199] In addition, the backlight module 50 also includes a back plate 51, a light source 52, a diffuser plate 53, etc. The back plate 51 is assembled with the fixing frame 60. The light source 52, the diffuser plate 53 and the optical composite film 10 are stacked and installed on the inner side of the back plate 51. The light source 52 and the diffuser plate 53 are arranged opposite to each other. The optical composite film 10 is arranged on the side of the diffuser plate 53 away from the light source 52. The display panel 40 is installed on the fixing frame 60 and is opposite to the optical composite film 10.

[0200] During operation, the light emitted by the light source 52 passes through the diffuser plate 53 and the optical composite film 10 in sequence before illuminating the display panel 40, resulting in uniform brightness on the display panel 40 and balancing the light intensity from different viewing angles. This ensures that viewers at different angles on the interactive display device 100 can observe a clear image, enhancing the user experience. In some embodiments, the display panel 40 is a liquid crystal display screen.

[0201] In some embodiments, the dimming structure 12a, prism film layer 13, diffusion layer 14, etc., employ a microprism structure. The inclined surfaces on both sides of the microprism in the width direction form a fixed angle, which will refract or totally reflect the incident light in a specific direction, only able to concentrate and guide the light to a limited viewing angle range matching the angle. When the viewer changes their viewing angle, the angle formed by the microprisms in different areas of the display screen and the line of sight becomes different. The microprisms in some areas can precisely refract the light into the viewer's eye (forming a bright area), while the microprisms in other areas, because the direction of light refraction deviates from the line of sight, cause the light to not effectively reach the viewer's field of vision (forming a dark area), ultimately causing uneven brightness in different areas of the display screen. For this reason, refer to Figure 16 This application provides an optical composite film 10, which includes a dimming film layer 12. The dimming film layer 12 includes a first substrate layer 122, a UV adhesive structure, a first diffusion structure 123, and a light-diffusing film 124. The light-diffusing film 124 is disposed on the side of the first substrate layer 122 opposite to the dimming structure 12a. The first diffusion structure 123 includes a plurality of microlenses 1231, which are disposed on the side of the light-diffusing film 124 opposite to the dimming structure 12a, and the surface of the microlenses 1231 on the side opposite to the dimming structure 12a is convex.

[0202] In the above embodiments, the light-diffusing film 124 serves as the substrate for the microlens 1231, providing a flat and stable support for the microlens 1231 and preventing tilting or shifting of the microlens 1231 due to uneven substrate, thereby improving the uniformity of light diffusion. The microlens 1231 is located on the side of the light-diffusing film 124 facing away from the dimming structure 12a, and the surface of the microlens 1231 facing away from the dimming structure 12a is a convex arc surface. The convex arc surface allows the directional light transmitted from the dimming structure 12a to be refracted and diffused in different directions along different arcs, making the light more evenly dispersed in various areas of the display surface at different viewing angles. This effectively eliminates the directional concentration of light (e.g., narrow-angle strong light from the prism film layer 13 or the dimming structure 12a), reduces "bright spots" and "dark areas" in the display screen, and improves the overall light emission uniformity of the display screen.

[0203] In some embodiments, the light-diffusing film 124 is made of any one of the following materials: polycarbonate (PC), polyethylene terephthalate (PET), polystyrene (PS), polyethylene (PE), and polymethyl methacrylate (PMMA), and the thickness of the light-diffusing film 124 is 30 μm to 300 μm. This allows for flexible processing and manufacturing of the light-diffusing film 124, enabling the production of various thicknesses within this range, and thus creating a series of products with different specifications to meet diverse application requirements.

[0204] Optionally, multiple microlenses are arranged in a rectangular array along the second direction XX' and the third direction YY'. The symmetry of the rectangular arrangement can ensure uniform diffusion in the horizontal and vertical directions, avoiding excessive concentration of light in a single direction (such as the horizontal direction). This is suitable for scenarios that require a balance between horizontal and vertical viewing angles (such as television screens and computer monitors).

[0205] Optionally, multiple microlenses can be arranged in a hexagonal array. The hexagonal arrangement provides higher symmetry and can reduce the slight brightness attenuation that may be caused by the gap distribution in the rectangular array. Combined with the diffused particles in the microlenses 1231, it can further eliminate local differences in brightness and darkness, making it suitable for scenarios with extremely high uniformity requirements (such as medical imaging displays and photolithography illumination systems).

[0206] Optionally, multiple microlenses can be arranged irregularly. For example, the spacing of microlenses 1231 can gradually change along the third direction YY' (e.g., the spacing is small in the central region and large in the edge region), or the local density can be adjusted according to the target viewing angle requirements.

[0207] In one embodiment, the microlens 1231 is made by mixing a first optical adhesive with diffusing particles, such that the first optical adhesive cures to form the main structure of the microlens 1231, and the diffusing particles are dispersed within the microlens 1231.

[0208] The microlens 1231 refracts light at a large angle through its convex arc surface, achieving macroscopic optical path control. At the same time, the diffuser particles inside it reflect and refract light multiple times at the microscale, playing a secondary light homogenization role. This forms a multi-level diffusion system that guides at the macro level and disperses at the micro level, effectively eliminating more subtle brightness differences. For example, the light from the dimming structure 12a may have local small brightness fluctuations. The diffuser particles can further smooth out these fluctuations, further improving the brightness uniformity of the emitted light and avoiding visible "fine spots" or "bright and dark lines" in the display screen.

[0209] In some embodiments, any two adjacent microlenses 1231 are spaced apart. This spacing avoids overlap of the light fields at the edges of the microlenses 1231, reducing the risk of interference fringes formed due to light superposition. Furthermore, the spacing between any two adjacent microlenses 1231, combined with the diffuser particles within the microlenses 1231, allows the random scattering of light by the diffuser particles to further disrupt the regular superposition of light rays, eliminating weak light interference effects that may occur in the spaced areas, thereby improving the uniformity and optical consistency of the emitted light.

[0210] Please refer to Figure 17 In one embodiment, the distance c between any two adjacent microlenses 1231 satisfies the condition: 20μm≥c≥5μm.

[0211] If the spacing c is less than 5 μm, the diffusion ranges of adjacent microlenses 1231 will overlap excessively, potentially causing localized overbrightness due to light superposition. If the spacing c is greater than 20 μm, the gap area may exceed the diffusion coverage of microlenses 1231, preventing light from completely filling the gap and forming visible dark lines, thus leading to uneven light distribution. The spacing c satisfies the condition: 20 μm ≥ c ≥ 5 μm. This ensures that the diffused light fields generated by adjacent microlenses 1231 can fully overlap, completely filling the gaps between them, thus avoiding the formation of insufficiently scattered dark areas due to excessive spacing. Simultaneously, it prevents excessive overlap of diffusion areas due to insufficient spacing, thus avoiding the superposition of scattered light from multiple microlenses 1231 in the same area to form localized bright spots. Therefore, the entire microlens array can function as a continuous, uniform, and efficient secondary diffusion surface, significantly improving the spatial consistency of brightness during the softening and homogenization of light.

[0212] In some embodiments, the convex arc surface is a spherical arc surface 1231a.

[0213] In some embodiments, the curvature of the points from the center of the spherical arc surface 1231a to the upper edge of the spherical arc surface 1231a is consistent, which can diffuse the incident light uniformly in the horizontal and vertical directions, avoiding the problem that the diffusion in one direction is too strong and the diffusion in another direction is insufficient in the asymmetric structure.

[0214] Please refer to Figure 17 In one embodiment, the microlens 1231 has a circular bottom surface 1231b that is attached to the homogenizing film 124. The diameter a of the circular bottom surface 1231b satisfies the condition: 100μm ≥ a ≥ 5μm. The radius r of the spherical arc surface 1231a satisfies the condition: 100μm ≥ r ≥ 5μm.

[0215] The diameter *a* of the circular base surface 1231b determines the optical working area of ​​a single microlens. If the diameter *a* is less than 5 μm, the microlens size is too small, resulting in a limited diffused light spot range that cannot effectively cover the gaps between adjacent lenses, easily leading to microscopic brightness unevenness on the light-emitting surface. If the diameter *a* is greater than 100 μm, the lens size is too large, potentially causing the diffused light to be too concentrated, reducing the homogenization effect, and also significantly increasing the difficulty of arranging a microlens array on a limited film area. The preferred diameter *a* of the circular base surface 1231b is within the range of 5 μm to 100 μm, allowing the microlenses to provide a sufficiently large optical working surface for effective wide-angle diffusion while ensuring their fine size, facilitating dense arrangement within a unit area to form a continuous and uniform secondary diffusion layer. Microlenses with diameters close to 5 μm are suitable for fine diffusion (such as pixel-level homogenization in high-resolution displays), while microlenses with diameters close to 100 μm are suitable for large-area light spreading (such as in lighting panels).

[0216] The radius r of the spherical arc surface is set within the range of 5μm to 100μm. A smaller r value (such as close to 5μm) corresponds to a larger curvature, which can produce a stronger refraction effect on light, causing it to diffuse outward at a larger angle and effectively enhancing the light intensity in the wide viewing angle direction; a larger r value (such as close to 100μm) corresponds to a gentler curvature, with a milder refraction effect on light, which is conducive to maintaining brightness in the positive viewing angle and producing a smooth light transition. The radius r of the spherical arc surface is in the range of 5μm to 100μm, so that the curvature can be adjusted according to actual needs to ensure that the brightness in both the wide viewing angle and the positive viewing angle within the target's field of view is at an appropriate level.

[0217] More importantly, the radius r of the spherical arc surface and the diameter a of the bottom surface are effectively combined to finely control the angular distribution and energy distribution of the diffused light field, thereby optimizing the brightness at large viewing angles, the brightness at normal viewing angles, and the uniformity of light.

[0218] For example, when the radius r of the spherical arc surface is half the diameter of the circular base 1231b (such as the diameter of the circular base 1231b being 20 μm and the radius of the spherical arc surface 1231a being 10 μm), the microlens forms a hemispherical structure, and at this time, the light diffuses uniformly in ±45°.

[0219] If the radius of the spherical arc surface 1231a is greater than half the diameter of the circular base surface 1231b (e.g., the diameter of the circular base surface 1231b is 20μm and the radius of the spherical arc surface 1231a is 15μm), the surface is smoother and the diffusion angle is widened to ±60° (suitable for wide-viewing-angle scenes).

[0220] If the radius of the spherical arc surface 1231a is less than half the diameter of the circular base surface 1231b (e.g., the diameter of the circular base surface 1231b is 20μm and the radius of the spherical arc surface 1231a is 8μm), the surface is steeper and the diffusion angle is narrowed to ±30° (suitable for directional focusing scenarios).

[0221] The thickness b of the microlens 1231 satisfies the condition: 100μm≥b≥5μm, wherein the thickness direction of the microlens 1231 is the same as the thickness direction of the uniform film, that is, along the first direction ZZ'.

[0222] The thickness of the microlens 1231 along the first direction ZZ' ensures that the light has a sufficient propagation path within the microlens 1231, and together with the internal diffusion particles, further improves the overall light emission uniformity of the display screen.

[0223] The thickness *b* of the microlens 1231 affects the optical path length of light propagating within it. If the thickness *b* of the microlens 1231 is less than 5 μm, the microlens 1231 is too flat, and the light will be difficult to control effectively due to the short effective distance, resulting in a weak diffusion effect. If the thickness of the microlens 1231 is greater than 100 μm, the optical path length within it will be longer, which may not only introduce unnecessary absorption or scattering losses, but may also cause excessive divergence of the light path or the generation of stray light due to excessive refraction, thus destroying the uniformity and controllability of the emitted light. Therefore, a thickness range of 5 μm to 100 μm ensures that the microlens 1231 has effective optical functions while avoiding negative effects caused by unsuitable structural dimensions, which is conducive to achieving a stable and uniform diffusion effect.

[0224] In some other embodiments, the convex arc surface is a parabolic surface. A parabolic surface can also refract and diffuse the directional light transmitted from the dimming structure to a larger angle, reducing "bright spots" and "dark areas" in the display screen and improving the overall light emission uniformity of the display screen.

[0225] In some other embodiments, the convex surface is an elliptical surface. The elliptical surface can also refract and diffuse the directional light from the dimming structure to a larger angle, reducing "bright spots" and "dark areas" in the display screen and improving the overall light emission uniformity of the display screen.

[0226] See Figure 16 In one embodiment, the light-diffusing film 124 can be connected to the first substrate layer 122 via the third adhesive layer 125.

[0227] This application also provides a method for preparing an optical composite film, which is used to prepare the optical composite film of any of the above embodiments. The preparation method includes connecting a base film layer 11, a dimming film layer 12, and a prism film layer 13 to each other.

[0228] In one embodiment, the step of preparing the first diffusion structure 123 in the dimming film layer 12 in this preparation method includes:

[0229] A mold is provided, with multiple grooves on one side of the mold.

[0230] A first optical adhesive containing dispersed diffusing particles is filled into multiple grooves.

[0231] The light-diffusing film 124 is laid on one side of the mold with multiple grooves.

[0232] The first optical adhesive is cured so that microlenses 1231 are formed in the multiple grooves respectively, and the microlenses 1231 are formed on the light-diffusing film 124.

[0233] The microlens 1231 formed on the homogenizing film 124 is demolded.

[0234] In the above-described steps for preparing the first diffusion structure 123, the diffusion particles and the first optical adhesive are first mixed and then injected into a groove on the mold. Next, the light-diffusing film 124 is placed over the mold, and finally, the first optical adhesive is cured using UV light. The diffusion particles and the first optical adhesive are pre-mixed, and the particles are ensured to be evenly distributed in the adhesive through stirring, ultrasonication, etc., avoiding local aggregation or sparseness. After being injected into the mold groove, the diffusion particles maintain a stable spatial distribution before curing, resulting in more uniform light scattering by the final diffusion film. When covering the light-diffusing film 124, pressure can be used to spread the mixed adhesive (the mixed diffusion particles and the first optical adhesive) evenly, eliminating surface unevenness. Simultaneously, the light-diffusing film 124 itself has a certain degree of light transmittance and support, further buffering light scattering and making the emitted light softer. Furthermore, after curing with UV light, the light-diffusing film 124 and the microlens 1231 disposed on the light-diffusing film 124 can be directly obtained, simplifying the manufacturing process. Compared to traditional heat curing, UV light curing can shorten the production cycle, making it suitable for large-scale continuous production. Furthermore, the degree of curing can be precisely controlled by the intensity and duration of UV light irradiation, ensuring complete curing of the adhesive and reducing problems such as yellowing and decreased light transmittance caused by uncured components in the later stages.

[0235] This application also provides an interactive display device, which includes a display panel, a backlight module, etc. The backlight module includes the optical composite film 10 as described in any of the above embodiments.

[0236] It is understandable that the dimming structure 12a has an extension direction. When the dimming structure 12a is the first microprism 121, the extension direction of the dimming structure 12a is consistent with the extension direction of the prism line of the first microprism 121.

[0237] like Figure 19 As shown, in some embodiments, at least a portion of the first microprism 121 has an angle of 48° and a width of 50 μm. The spacing between two adjacent dimming structures 12a is 4 μm.

[0238] Through experimental verification, under the above conditions, not only can an optical effect be obtained where the brightness is not less than 1 / 3 of the brightness at a 60° angle from the side of the interactive display device, but further optical effects can also be obtained, including: (1) less brightness loss at the normal viewing angle; and (2) more uniform brightness variation from the normal viewing angle area to the wide viewing angle area.

[0239] In some embodiments, the applicant conducted comparative tests on two cases: the interactive display device with a DOPP optical film (a composite film of a diffusion film and two microprism films) and the interactive display device with the dimming film layer of this embodiment, to study the effect of replacing the DOPP optical film in the interactive display device with the dimming film layer of this embodiment. The test results show that after replacing the DOPP optical film with the dimming film layer of this embodiment, the optical loss at the forward viewing angle is less than 25%. Compared with the wide-viewing-angle optical films in related technologies, the optical loss at the forward viewing angle is significantly reduced.

[0240] In addition, the applicant tested the brightness change of the interactive display device under different viewing angles after applying the dimming film layer in this embodiment. The test results showed that the increase in viewing angle and the decrease in brightness generally followed a linear law. This means that the brightness change is relatively uniform from the normal viewing angle area to the wide viewing angle area, which helps to eliminate the abruptness of visual changes for people.

[0241] like Figure 19 As shown, in some embodiments, the entire number of first microprisms 121 are divided into a first portion and a second portion. The first portion of the first microprisms 121 has a prism angle of 48° and a width of 50 μm. The second portion of the first microprisms 121 has a prism angle of 48° and a width of 45 μm.

[0242] It is understandable that when the angle of the first microprism 121 in the second part is equal to the angle of the first microprism 121 in the first part, and the width of the first microprism 121 in the second part is less than the width of the first microprism 121 in the first part, the height of the first microprism 121 in the second part is also less than the height of the first microprism 121 in the first part.

[0243] In the above embodiments, all first microprisms are divided into two parts with widths of 50μm and 45μm (corresponding to different heights) but maintaining the same angle (48°). On the one hand, the uniform angle (48°) ensures the consistency of the light refraction direction, stabilizing the optical function of brightening at large viewing angles. On the other hand, the difference in width and height of the first microprisms 121 in the first and second parts causes subtle phase and path changes in light as it passes through the array of first microprisms 121. This effectively smooths the brightness transition from the normal viewing angle to the large viewing angle region, significantly improving the brightness uniformity at different viewing angles. At the same time, this quasi-periodic array structure composed of two feature sizes disrupts the spatial interference conditions that may form between the microstructure of the optical film itself and the pixel array of the display panel, thereby suppressing the generation of moiré patterns and improving the purity of the image.

[0244] In some embodiments, the optical composite film 10 further includes a base film layer 11 and a prism film layer 13. A dimming film layer 12 is disposed on one side of the base film layer 11, and a dimming structure 12a is opposite to the base film layer 11 and is disposed toward the light source 52. The prism film layer 13 is disposed on the side of the base film layer 11 away from the dimming film layer 12.

[0245] While increasing the light emission angle, the dimming film layer 12 also reduces the light concentration, resulting in a certain degree of brightness reduction in the backlight after passing through it. In this embodiment, the dimming film layer 12 and the prism film layer 13 are used together. First, the prism film layer 13 is used to enhance the backlight brightness, and then the dimming film layer 12 is used to increase the light emission angle. This helps to ensure that the interactive display device has high brightness.

[0246] like Figure 20 As shown, in one embodiment, a DBEF core layer 16 is provided on the side of the dimming film layer 12 facing away from the base film layer 11.

[0247] The DBEF (Double Brightness Enhancing Film), also known as a dual brightness enhancement film, typically consists of a DBEF core layer 16 and a PET film disposed thereon, with the PET film primarily serving a protective function. In related technical fields, using the DBEF film in conjunction with the prism film layer 13 can achieve a better effect in enhancing the brightness of interactive display devices.

[0248] In this embodiment, the prism film layer 13 is located between the light source 52 and the dimming film layer 12, and the DBEF core layer 16 is located on the side of the dimming film layer 12 closer to the display panel. Thus, by using the dimming film layer 12, the prism film layer 13 and the DBEF core layer 16 together, the interactive display device can achieve a better brightness enhancement effect and a better viewing angle enhancement effect.

[0249] In one embodiment, a first polarizer 15 is disposed on the side of the dimming film layer 12 away from the base film layer 11. The dimming structure 12a has at least one ridge extending along its own length direction. The orthographic projection of the ridge of the dimming structure 12a onto the first polarizer 15 has a second angle with the light transmission axis of the first polarizer 15. The second angle is greater than or equal to 0° and less than or equal to 80°.

[0250] As mentioned above, while the dimming film layer 12 expands the light emission angle, it also causes a certain degree of brightness reduction in the backlight after passing through it. In this embodiment, the orthographic projection of the edge of the dimming structure 12a onto the first polarizer 15 forms a second angle with the light transmission axis of the first polarizer 15. This second angle is greater than or equal to 0° and less than or equal to 80°. Under these conditions, the direction in which the dimming film layer 12 expands the light emission angle is necessarily not parallel to the direction of the light transmission axis of the first polarizer 15. This design ensures that the brightness of the interactive display device will not be significantly reduced at the user's usual viewing angle.

[0251] Taking a wall-mounted interactive display device as an example, in this case, the horizontal viewing angle is the user's usual viewing angle. By setting the direction of the dimming film layer 12 as described above, the brightness of the interactive display device will not decrease significantly when the user views it from a horizontal perspective and at a wide viewing angle. Of course, if the user views the interactive display device from a vertical perspective and at a wide viewing angle, the brightness may decrease significantly. However, since the horizontal viewing angle is the user's usual viewing angle, and the wide viewing angle from a vertical perspective is not the user's usual viewing angle, it will not affect the user experience.

[0252] The applicant of this application tested the optical effect of the dimming film layer 12. Different samples were fabricated during the tests, in which the dimming structure 12a in each sample was constructed as a first microprism 121. Sample information is as follows:

[0253] Sample 1: The first microprism 121 has an edge angle of 46°, the distribution distance K of the dimming structure 12a is 54μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 72%. The distribution distance K of the dimming structure 12a is equal to the distance L between two adjacent dimming structures 12a plus the width of the dimming structure 12a itself.

[0254] Sample 2: The first microprism 121 has an angle of 46°, the distribution distance K of the dimming structure 12a is 54μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 65%.

[0255] Sample 3: The first microprism 121 has an angle of 50°, the distribution distance K of the dimming structure 12a is 54μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 72%.

[0256] Sample 4: The first microprism 121 has an edge angle of 50°, the distribution distance K of the dimming structure 12a is 54μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 65%.

[0257] Sample 5: The first microprism 121 has an edge angle of 48°, the distribution distance K of the dimming structure 12a is 60μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 72%.

[0258] Sample 6: The first microprism 121 has an edge angle of 48°, the distribution distance K of the dimming structure 12a is 60μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 65%.

[0259] Sample 7: The first microprism 121 has an edge angle of 48°, the distribution distance K of the dimming structure 12a is 54μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 72%.

[0260] Sample 8: The first microprism 121 has an edge angle of 48°, the distribution distance K of the dimming structure 12a is 54μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 65%.

[0261] Sample 9: The first microprism 121 has an angle of 86°, the distribution distance K of the dimming structure 12a is 70μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 72%.

[0262] Sample 10: The first microprism 121 has an angle of 86°, the distribution distance K of the dimming structure 12a is 70μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 65%.

[0263] Sample 11: The first microprism 121 has an angle of 88°, the distribution distance K of the dimming structure 12a is 70μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 72%.

[0264] Sample 12: The first microprism 121 has an angle of 88°, the distribution distance K of the dimming structure 12a is 70μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 65%.

[0265] Sample 13: The first microprism 121 has an edge angle of 90°, the distribution distance K of the dimming structure 12a is 70μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 72%.

[0266] Sample 14: The first microprism 121 has an angle of 90°, the distribution distance K of the dimming structure 12a is 70μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 65%.

[0267] Sample 15: The first microprism 121 has an edge angle of 90°, the distribution distance K of the dimming structure 12a is 64μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 72%.

[0268] Sample 16: The first microprism 121 has an edge angle of 90°, the distribution distance K of the dimming structure 12a is 64μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 65%.

[0269] Among them, the height of each dimming structure 12a in the UV adhesive structure of samples 1 to 16 is the same.

[0270] In addition, samples 17 and 18 were prepared. The height of some dimming structures 12a in the UV adhesive structure of sample 17 differs. Similarly, the height of some dimming structures 12a in sample 18 differs. Information about samples 17 and 18 is as follows:

[0271] Sample 17: The first microprism 121 has an angle of 46°, the distribution distance K of the dimming structure 12a is 54μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 65%.

[0272] Sample 18: The first microprism 121 has an edge angle of 48°, the distribution distance K of the dimming structure 12a is 54μm, the refractive index n1 of the UV glue structure is 1.55, and the haze is 65%.

[0273] The applicant tested the optical performance of the dimming film layer 12 when used alone for samples 1 to 18. Based on the test results, the parameter combination with better optical performance can be selected.

[0274] refer to Figure 20 In one embodiment, a protective film 18 is provided between the diffuser plate 53 and the dimming film layer 12.

[0275] For example, the protective film 18 can be a PET film, which has good optical properties and physical characteristics. By providing the protective film 18, wear and tear on the dimming structure 12a can be avoided, thereby improving the working stability of the dimming film layer 12.

[0276] One embodiment of this application provides an interactive display device, including an optical composite film and a display panel as described in any of the above embodiments, and a light source, wherein the light source is located between the display panel and the optical composite film.

[0277] See Figure 22 One embodiment of this application provides a polarizer assembly. The polarizer assembly includes a first polarizer 15 and a dimming film layer 12. The first polarizer 15 is disposed on the side of the first diffusion structure 123 opposite to the UV adhesive structure.

[0278] In this embodiment, the first polarizer 15 is disposed on the side of the first diffusion structure 123 opposite to the UV adhesive structure, and the dimming film layer 12 is integrated with the first polarizer 15 to form a polarizer assembly. In actual manufacturing, the first polarizer 15 can be used as a carrier sheet, and the dimming film layer 12 can be fabricated on the first polarizer 15 to form the polarizer assembly. In some embodiments, the dimming film layer 12 includes the first diffusion structure 123 and the UV adhesive structure. If the UV adhesive structure is disposed on the first diffusion structure 123, then the first substrate layer 122 is not required.

[0279] During the assembly of interactive display devices, once the polarizer assembly is bonded to the display panel, the interactive display device gains a wide viewing angle. Compared to the assembly process in related technologies, this eliminates the need for separately bonding the wide-viewing-angle optical film, thereby improving the assembly efficiency of the interactive display device.

[0280] See Figure 23 In one embodiment, the first diffusion structure 123 includes a diffusion substrate 123a and a plurality of scattering structures 123b distributed on the diffusion substrate 123a, wherein the refractive index of the scattering structures 123b is not equal to the refractive index of the diffusion substrate 123a.

[0281] The diffusion substrate 123a may be formed by curing a first optical adhesive. The refractive index of the first optical adhesive is 1.40 to 1.65.

[0282] A scattering structure 123b is provided in the diffusion substrate 123a. Through the scattering effect of the scattering structure 123b on light, a first diffusion structure 123 with a light diffusion effect can be formed.

[0283] By making the refractive index of the scattering structure 123b different from that of the diffusion substrate 123a, each tiny interface between the scattering structure 123b and the diffusion substrate 123a becomes a specific light scattering point. When light passes through these interfaces, it will be randomly but generally controlled to deflect due to the abrupt change in refractive index, thereby achieving efficient volume scattering. This finely homogenizes and diffuses the light that has been directionally controlled by the first microprism 121, effectively eliminating local optical fringes (such as interference fringes) or bright spots that may remain in the first microprism 121 due to its regular structure. As a result, the distribution of light at various viewing angles becomes smooth and continuous, ensuring that the displayed image has good visual uniformity and a soft viewing effect.

[0284] See Figure 24 This application provides an interactive display device, wherein a second polarizer 17 is further provided on the light-emitting side of the display panel 40. The arrangement of the second polarizer 17 can refer to the arrangement in the prior art, and will not be described in detail in this application.

[0285] Please see Figure 25 and Figure 26 This application provides a wide viewing angle module, including a display panel 40, an optical composite film 10, and a connector. The display panel 40 has a light-incident surface 41 and a light-exiting surface 42. Light enters the display panel 40 through the light-incident surface 41 and exits through the light-exiting surface 42. The optical composite film 10 is disposed on one side of the light-incident surface 41 of the display panel 40. The optical composite film 10 can deflect light towards the edge of the display panel 40. The connector is used to connect the optical composite film 10 to the display panel 40. The optical composite film 10 is the optical composite film in any of the above embodiments.

[0286] The wide-viewing-angle module provided in this application improves the viewing angle by setting an optical composite film 10 on one side of the light-incident surface 41 of the display panel 40, causing the light to be deflected towards the edge of the display panel 40. This results in a larger diffusion angle for the light emitted from the light-exiting surface 42 of the display panel 40. Furthermore, by setting a connector, the optical composite film 10 is connected to the display panel 40, and the display panel 40 provides support and fixation for the optical composite film 10. This eliminates the need for an additional diffuser plate to support the optical composite film 10, reducing production costs and allowing for a thinner design of the wide-viewing-angle module, which is more conducive to the thinner design of interactive display devices.

[0287] Please see Figure 25 In some embodiments, the wide-viewing-angle module further includes a backlight module 50, which is disposed on the side of the optical composite film 10 facing away from the display panel 40, and is used to provide a light source for the display panel 40. The backlight module 50 includes a back plate 51, a light source 52, and a reflector 54. The reflector 54 is disposed on the surface of the back plate 51 facing the optical composite film 10, and the reflector 54 reflects the light emitted by the light source 52 to increase the amount of light entering the optical composite film 10.

[0288] Please see Figure 26 and Figure 27 In some embodiments, the connector is constructed as a first adhesive 71, which is disposed between the display panel 40 and the optical composite film 10. The display panel 40 and the optical composite film 10 are connected and fixed by adhesive bonding, which is simple in structure and relatively quick to operate.

[0289] like Figure 26 As shown, a first adhesive 71 is provided at least on the edge of the light-incident surface 41 of the display panel 40; and / or at least on the side edge of the optical composite film 10 facing the display panel 40. During assembly, the first adhesive 71 is provided on the edge of at least one of the display panel 40 or the optical composite film 10, and then the display panel 40 and the optical composite film 10 are bonded together, which is convenient and efficient.

[0290] like Figure 27 As shown, the light-incident surface 41 of the display panel 40 is coated with a first adhesive 71; and / or the side of the optical composite film 10 facing the display panel 40 is coated with a first adhesive 71. By coating the display panel 40 and / or the optical composite film 10 with a first adhesive 71, it is beneficial to bond the display panel 40 and the optical composite film 10 more firmly.

[0291] Please see Figure 28 In some embodiments, the wide-viewing-angle module also includes a bezel 80, which surrounds the edge of the display panel 40 and may also surround a glass cover plate 90. In this case, the connector can be configured as a screen pressing member 72, which connects the optical composite film 10 and the bezel 80 to indirectly achieve the connection and fixation of the optical composite film 10 and the display panel 40.

[0292] In some embodiments, the optical composite film 10 has a connecting groove on its side facing the display panel 40, one end of the screen pressing member 72 is fixedly inserted into the connecting groove, and the other end of the screen pressing member 72 is connected to the frame 80. Thus, both ends of the screen pressing member 72 are fixedly connected to the optical composite film 10 and the frame 80, respectively.

[0293] In some embodiments, the screen pressing component 72 and the frame 80 can be connected by adhesive bonding or by fasteners such as bolts or screws. To ensure the firmness of the screen pressing component 72 in the connecting groove, adhesive can also be applied between the screen pressing component 72 and the groove wall of the connecting groove to further improve the connection between the two through adhesive bonding.

[0294] The specific structural form of the screen pressing component 72 is not limited here, as long as it can achieve the connection between the optical composite film 10 and the display panel 40. In this embodiment, two exemplary structures of the screen pressing component 72 are provided; please refer to the following for details. Figure 29 and Figure 30 .

[0295] like Figure 29 As shown, the screen pressing component 72 includes a hook portion 721 and a connecting portion 722 connected to each other, and the hook portion 721 and the connecting portion 722 are arranged at right angles. During assembly, the hook portion 721 is inserted into the connecting groove on the optical composite film 10, and the connecting portion 722 extends outward from the surface of the optical composite film 10 and is connected to the frame 80.

[0296] like Figure 30As shown, the screen pressing component 72 also includes a hook portion 721 and a connecting portion 722 connected together, with the hook portion 721 configured as U. During assembly, the end of the hook portion 721 not connected to the connecting portion 722 is inserted into the connecting groove on the optical composite film 10, and the end of the hook portion 721 connected to the connecting portion 722 is attached to the outer wall of the optical composite film 10 in the thickness direction. The frame 80 extends toward the optical composite film 10 and abuts against the connecting portion 722.

[0297] Please continue reading. Figure 25 and Figure 26 The wide-viewing-angle module also includes a glass cover plate 90, which is disposed on one side of the light-emitting surface 42 of the display panel 40. The glass cover plate 90 is used to protect the display panel 40, wherein the display panel 40 can be attached to the glass cover plate 90 to realize the installation and fixation of the display panel 40 in the interactive display device.

[0298] In some embodiments, see Figure 26 The glass cover 90 and the display panel 40 are connected by a second adhesive 73. In some embodiments, the second adhesive 73 is provided along the edges of the surfaces of the glass cover 90 and the display panel 40 facing each other, and the second adhesive 73 forms a frame to bond the glass cover 90 and the display panel 40. In other embodiments, the surfaces of the glass cover 90 and the display panel 40 facing each other are fully coated with the second adhesive 73. The specific shape and area of ​​the second adhesive 73 are not limited here, as long as it can firmly connect the glass cover 90 and the display panel 40.

[0299] An interactive display device according to one embodiment of this application includes a wide-viewing-angle module as described in any of the above embodiments.

[0300] Please refer to Figure 31 The brightness of the interactive display device 100 at different viewing angles can be measured using a luminance meter 200 (e.g., a Konica Minolta CS2000 luminance meter, a Topcon BM-7 luminance meter, etc.). In some embodiments, the luminance meter 200 can be placed directly in front of the interactive display device 100, with the optical axis of the lens in the luminance meter 200 perpendicular to the display surface, thus obtaining the brightness of the interactive display device 100 at a second viewing angle. Alternatively, the luminance meter can be placed at an angle to the side of the interactive display device 100, with the optical axis of the lens in the luminance meter 200 forming a 30° angle with the display surface, thus obtaining the brightness of the interactive display device 100 at a first viewing angle.

[0301] In the above embodiments, in the optical composite film, multiple microprisms are disposed in some film layers. For example, the dimming film layer 12 has multiple first microprisms 121, the prism film layer 13 has multiple second microprisms 132, and the diffusion layer 14 has multiple third microprisms 141. The following describes some technical solutions that can be used to prepare optical films with microprisms. The optical film can be any film layer with microprisms. For example, the optical film can include a first substrate layer and multiple first microprisms disposed on the first substrate layer; the optical film can also include a second substrate layer and multiple second microprisms disposed on the second substrate layer; the optical film can also be a diffusion film, which includes a third substrate layer and multiple third microprisms disposed on the third substrate layer.

[0302] Please refer to Figures 32 to 34 In some embodiments of this application, a rolling device is provided, wherein the outer periphery of the roller 310 is provided with a plurality of first strip grooves 301. The adhesive is injected between the roller 310 and the substrate film 410 through the liquid injection device 320, and the substrate film 410 is rolled by the roller 310. The adhesive on the rolled substrate film 410 is cured by the curing device 330, thereby forming a plurality of strip prisms on the surface of the substrate film 410, thus obtaining the finished optical film.

[0303] Please refer to Figure 34 In some technical solutions, the first strip groove 301 on the roller 310 is arranged along the axial direction of the roller 310 in the length direction, and multiple first strip grooves 301 are arranged around the roller 310 in sequence. However, when using this roller pressing device to roll the optical film, the roller 310 has a high surface energy, which makes it difficult to demold the optical film. Forced demolding leads to poor quality of the finished optical film.

[0304] Please refer to Figure 32 and Figure 33 Furthermore, some rollers 310 of the rolling device have first strip grooves 301 arranged along their length direction around the circumference of the roller 310, and multiple first strip grooves 301 are arranged sequentially along the axial direction of the roller 310. Optical films prepared by this type of roller 310 (compared to...) Figure 34 Rollers 310 make demolding easier. Therefore, to facilitate demolding, rollers 310 are often used. Figure 32 and Figure 33 The roller 310 shown is used to prepare optical films. However, when the optical film to be prepared has a large dimension along its length (the direction of arrangement of multiple strip prisms), the substrate film 410 used during rolling has a large dimension along the axial direction of the roller 310. At the same time, because the substrate film 410 is extremely thin and soft, it is difficult to keep the substrate film 410 flat during the rolling process of the roller 310, which will also lead to poor quality of the finished optical film.

[0305] This application also provides an embodiment of an optical film preparation apparatus, such as... Figure 35 As shown, the optical film preparation equipment includes: a main roller 510, a tension roller 520, a pressure roller 530, a liquid injection device 540, and a curing device 550. The tension roller 520 and the main roller 510 can be simultaneously surrounded by a flexible mold, tensioning the mold. The pressure roller 530 and the main roller 510 are located on the inner and outer sides of the flexible mold, respectively, for jointly pressing and conveying the mold and the substrate to be rolled. The liquid injection device 540 is located upstream of the main roller 510 along the conveying direction of the substrate, and is used to inject adhesive between the mold and the substrate. The curing device 550 is located downstream of the main roller 510 along the conveying direction of the substrate, and is used to cure the adhesive on the substrate after rolling.

[0306] The optical film preparation equipment may include a support structure, on which a main roller 510, a tension roller 520, a pressure roller 530, a liquid injection device 540, and a curing device 550 may be mounted. The optical film preparation equipment may include a drive device for simultaneously rotating the main roller 510, tension roller 520, and pressure roller 530. The drive device may be mounted on the support structure. The drive device may include drive components corresponding one-to-one with the main roller 510, tension roller 520, and pressure roller 530; alternatively, the drive device may include a transmission mechanism (e.g., a transmission belt) that drives any number of the main roller 510, tension roller 520, and pressure roller 530 to rotate simultaneously, thus reducing the number of drive components required. The curing device 550 may be a UV curing lamp.

[0307] Soft molds (such as first-generation soft molds and second-generation soft molds mentioned below) refer to molds made of flexible materials (such as silicone, rubber, polyurethane, etc.) rather than rigid materials (such as metal, hard plastic, etc.). The soft mold in this embodiment of the application has a ring-shaped closed structure so that it can surround the tension roller 520 and the main roller 510, so that when the main roller 510 and the tension roller 520 rotate, they can drive the soft mold to rotate continuously along its circumference.

[0308] The main roller 510 abuts against the inner circumferential surface of the flexible mold. The substrate to be rolled is located between the outer circumferential surface of the flexible mold and the pressure roller 530, and abuts against the pressure roller 530. The pressure roller 530 and the main roller 510 press together. When the pressure roller 530 and the main roller 510 rotate together, they can transport the flexible mold and the substrate to be rolled.

[0309] The injection device 540 is used to inject adhesive between the soft mold and the substrate to be rolled. The injection device 540 is located upstream of the main roller 510 along the conveying direction of the substrate to be rolled. Therefore, the adhesive can enter between the soft mold and the substrate before the substrate to be rolled is subjected to rolling.

[0310] The curing device 550 is located downstream of the main roller 510 along the conveying direction of the substrate to be rolled. The curing device 550 is used to cure the adhesive liquid on the substrate after rolling.

[0311] Please refer to Figure 36 This application also provides an optical film preparation method, which includes at least steps S100, S200, and S300.

[0312] Step S100: Please combine Figure 32 , Figure 33 as well as Figure 37 The process involves producing a first-generation soft mold prototype 610, which includes a first soft mold substrate 611 and a plurality of first strip-shaped prisms disposed on the first soft mold substrate 611. The first strip-shaped prisms are matched with the first strip-shaped grooves 301 on the rollers 310 of the rolling device. A second strip-shaped groove is formed between any two adjacent first strip-shaped prisms. The two ends of the first-generation soft mold prototype 610 are connected along the length direction of the first strip-shaped prisms to obtain a first-generation soft mold 600.

[0313] In some embodiments, a first-generation soft mold prototype 610 can be produced by a rolling device. Please refer to... Figure 32 and Figure 33 The rolling device includes a roller 310, and the outer periphery of the roller 310 is provided with a plurality of first strip-shaped grooves 301 arranged sequentially along the axial direction. The length direction of the first strip-shaped grooves 301 is arranged around the circumference of the roller 310. The rolling device used in this embodiment includes not only the roller 310, but also a liquid injection device 320, a curing device 330, etc. The specific structure of the rolling device is prior art, and its other components will not be described in detail. The roller 310 can be made of a hard material, such as metal.

[0314] Combination Figure 32 , Figure 33 as well as Figure 37In this step, the first flexible mold substrate 611 is attached to the outer periphery of the roller 310 and rolled in contact. While the roller 310 rotates, a first adhesive is injected between the roller 310 and the first flexible mold substrate 611 through the injection device 320, allowing the first adhesive to enter the first strip-shaped groove 301 on the roller 310. The rotation of the roller 310 rolls the first flexible mold substrate 611, causing the first adhesive in the first strip-shaped groove 301 to form on the first flexible mold substrate 611. The curing device 330 then cures the first adhesive on the rolled first flexible mold substrate 611, forming multiple first strip-shaped prisms matching the shape of the first strip-shaped groove 301 on the first flexible mold substrate 611, thus obtaining the first-generation flexible mold preliminary product 610. It can be understood that the first adhesive is the molding material for the first strip-shaped prisms. The first-generation flexible mold preliminary product 610 needs to be demolded from the roller 310. Because the multiple first strip grooves 301 on the roller 310 are arranged sequentially along the axial direction, the first-generation soft mold primary product 610 obtained by rolling with this roller 310 is easy to demold.

[0315] refer to Figure 37 It should be noted that, in order to connect the two ends of the first-generation soft mold prototype 610 along the length direction of the first strip prism to obtain a closed annular first-generation soft mold 600, during the rolling process using the rolling device, the first-generation soft mold prototype 610 along the length direction of the first strip prism can be rolled to a sufficiently long length, that is, the length of the first strip prism can be rolled to a sufficiently long length. Thus, by simply connecting the two ends of the first-generation soft mold prototype 610 along the length direction of the first strip prism, a closed annular first-generation soft mold 600 can be obtained.

[0316] Meanwhile, the dimension of the first-generation soft mold preliminary product 610 along the arrangement direction of the first strip prism is parallel to the axial direction of the roller 310. This dimension can be made shorter, which helps to keep the first soft mold substrate 611 flat when the first-generation soft mold preliminary product 610 is prepared using the rolling device.

[0317] Step S200: Reference Figure 35 Multiple second-generation soft mold units 710 are fabricated using a first-generation soft mold 600 and are to be assembled. Each second-generation soft mold unit 710 includes a second soft mold base material 711 and multiple second strip-shaped prisms disposed on the second soft mold base material 711. The second strip-shaped prisms match second strip-shaped grooves. The multiple second-generation soft mold units 710 are then connected end-to-end along the arrangement direction of the second strip-shaped prisms to obtain the second-generation soft mold 700. The molding material of the second strip-shaped prisms contains a release agent.

[0318] In step S100, it can be understood that a second strip groove can be formed between any two adjacent first strip prisms.

[0319] Specifically, in step S200, the second-generation soft mold unit 710 can be fabricated using an optical film fabrication device and a first-generation soft mold 600. (Reference) Figure 35 In this step, the first-generation flexible mold 600 is surrounded and tensioned by the tension roller 520 and the main roller 510. The tension roller 520 and the main roller 510 support the first-generation flexible mold 600 to keep it tensioned. The second flexible mold substrate 711 is located between the first-generation flexible mold 600 and the pressure roller 530. The pressure roller 530 and the main roller 510 jointly press the first-generation flexible mold 600 and the second flexible mold substrate 711. As the pressure roller 530 and the main roller 510 rotate simultaneously, they can jointly transport the first-generation flexible mold 600 and the second flexible mold substrate 711, thereby causing the first-generation flexible mold 600 to rotate around itself in the circumference, and the second flexible mold substrate 711 to be continuously transported between the pressure roller 530 and the main roller 510.

[0320] During the simultaneous rotation of the pressure roller 530 and the main roller 510, a second adhesive is injected into the space between the first-generation soft mold 600 and the second soft mold substrate 711 via the injection device 540. This allows the second adhesive to enter the second strip-shaped groove on the first-generation soft mold 600. The rotation of the pressure roller 530 and the main roller 510 rolls the second soft mold substrate 711, causing the second adhesive within the second strip-shaped groove to form on the second soft mold substrate 711. The curing device 550 then cures the rolled second adhesive on the second soft mold substrate 711, forming multiple second strip-shaped prisms that match the shape of the second strip-shaped groove on the second soft mold substrate 711, thus obtaining the second-generation soft mold unit 710. It can be understood that the second adhesive is the molding material for the second strip-shaped prisms. In other words, the second adhesive contains a release agent.

[0321] The second-generation soft mold unit 710 needs to be demolded from the first-generation soft mold 600. Since the length direction of the second strip groove in the first-generation soft mold 600 is along the circumference of the first-generation soft mold 600, and the arrangement direction of the multiple second strip grooves is along the axial direction of the main roller 510, the arrangement of the multiple second strip grooves in this roll forming die is similar to... Figure 33 The arrangement of the first strip groove of the roller 310 in the first generation soft mold 600 makes it easy for the second generation soft mold unit 710 to be demolded from it.

[0322] Compared to the first-generation soft mold 600, which only requires connecting the two ends of a first-generation soft mold prototype 610 to form a ring, the second-generation soft mold 700 requires multiple second-generation soft mold units 710 connected end-to-end. This means multiple second-generation soft mold units 710 need to be manufactured.

[0323] Understandably, a third groove can be formed between any two adjacent second prisms. Since the second groove is formed between two adjacent first prisms and matches the second prism, the third groove formed between two adjacent second prisms matches the first prism, and the third groove is the same as the first groove.

[0324] Step S300: Prepare the optical film using the second-generation soft mold 700.

[0325] refer to Figure 35 In specific implementation, this step can be carried out using optical film preparation equipment. In some embodiments, the second-generation flexible mold 700 is surrounded and tensioned by the tension roller 520 and the main roller 510. The tension roller 520 and the main roller 510 respectively support the second-generation flexible mold 700 to keep it tensioned. The substrate film 410 is located between the second-generation flexible mold 700 and the pressure roller 530. The pressure roller 530 and the main roller 510 jointly press the second-generation flexible mold 700 and the substrate film 410. During the simultaneous rotation of the pressure roller 530 and the main roller 510, they can jointly transport the second-generation flexible mold 700 and the substrate film 410, thereby causing the second-generation flexible mold 700 to rotate around its own circumference, and the substrate film 410 to be continuously transported between the pressure roller 530 and the main roller 510.

[0326] During the simultaneous rotation of the pressure roller 530 and the main roller 510, a third adhesive is injected into the space between the second-generation soft mold 700 and the substrate film 410 via the injection device 540. This third adhesive then enters the third groove on the second-generation soft mold 700. The rotation of the pressure roller 530 and the main roller 510 rolls the substrate film 410, causing the third adhesive within the third groove to form on the substrate film 410. The curing device 550 then cures the rolled third adhesive on the substrate film 410, forming multiple third prisms on the substrate film 410 that match the shape of the third groove, thus obtaining the optical film. Understandably, the third adhesive is the molding material for the third prisms. After molding, the optical film needs to be demolded from the second-generation soft mold 700. Because the second adhesive contains a release agent—that is, the molding material of the second prism of the second-generation soft mold 700 contains a release agent—the surface energy of the second-generation soft mold 700 is reduced, thereby making it easier to demold the molded optical film from the second-generation soft mold 700. The release agent can be made of materials such as synthetic resin or synthetic rubber.

[0327] When the second-generation soft mold 700 surrounds the main roller 510 and the tension roller 520, the arrangement direction of the multiple third strip grooves on the second-generation soft mold 700 is along the circumference of the second-generation soft mold 700. This allows the arrangement direction of the multiple third strip prisms formed on the substrate film 410 (i.e., the length direction of the finished optical film) to be along the conveying direction of the substrate film 410. The length direction of the third strip prisms (i.e., the width direction of the finished optical film, where the substrate film 410 is shorter) is parallel to the axial direction of the main roller 510. Furthermore, the substrate film 410 can be clamped and conveyed by the main roller 510 and the pressure roller 530 during the conveying process, thereby enabling the substrate film 410 to remain flat during the roller pressing process.

[0328] The above-described optical film preparation method first produces a first-generation soft mold prototype 610, on which a first strip-shaped prism matching the first strip-shaped groove 301 can be formed. The two ends of the first-generation soft mold prototype 610 along the length direction of the first strip-shaped prism are connected to obtain a first-generation soft mold 600. Then, multiple segments of second-generation soft mold units 710 to be assembled are produced using the first-generation soft mold 600, on which a second strip-shaped prism matching the second strip-shaped groove (located between two first strip-shaped prisms) can be formed. The multiple segments of second-generation soft mold units 710 are sequentially connected end-to-end along the arrangement direction of the second strip-shaped prisms to obtain a second-generation soft mold 700. Finally, an optical film is prepared using the second-generation soft mold 700, on which a third strip-shaped prism matching the third strip-shaped groove (located between two second strip-shaped prisms) can be formed on the substrate film 410 of the optical film, i.e., the third strip-shaped prism matches the first strip-shaped groove. The molding material of the second prism of the second-generation soft mold 700 contains a release agent.

[0329] If conventional optical film preparation methods are used, when the length dimension (along the arrangement direction of multiple third prisms) of the optical film to be prepared is large, the substrate film 410 used in the roll forming process has a large axial dimension along the roller 310. However, because the substrate film 410 is extremely thin and flexible, and its axial dimension along the roller 310 is large, it is difficult to keep the substrate film 410 flat during the roll forming process, resulting in poor quality of the finished optical film.

[0330] The optical film preparation method described in this application embodiment firstly fabricates a first-generation soft mold prototype 610, forming a first strip-shaped prism on the prototype 610 that matches the first strip-shaped groove 301. Then, a second-generation soft mold unit 710 is fabricated using the first-generation soft mold 600, forming a third strip-shaped groove on the second-generation soft mold unit 710 that matches the first strip-shaped prism; the third strip-shaped groove is identical to the first strip-shaped groove. Thus, a second-generation soft mold 700 is obtained by sequentially connecting multiple second-generation soft mold units 710 end-to-end along the arrangement direction of the second strip-shaped prism, with the arrangement direction of the multiple third strip-shaped grooves on the second-generation soft mold 700 along its circumference. This allows the arrangement direction of the multiple third prisms formed on the substrate film 410 (i.e., the length direction of the finished optical film) to be along the conveying direction of the substrate film 410, while the length direction of the third prisms (i.e., the width direction of the finished optical film, where the substrate film 410 is shorter) is parallel to the axial direction of the main roller 510. Thus, even if the size of the substrate film 410 along the arrangement direction of the multiple third prisms is large, the substrate film 410 can remain flat during the rolling process. At the same time, since the second prism of the second-generation soft mold 700 contains a release agent, the surface energy of the mold is reduced, making it easier to demold the substrate film 410 after the third prisms are formed from the second-generation soft mold 700, thereby improving the quality of the finished optical film. Meanwhile, referring to the aforementioned analysis, the second-generation soft mold unit 710 is easy to demold from the first-generation soft mold 600, and the first-generation soft mold primary product 610 is easy to demold from the roller 310 of the rolling device. That is, all stages in the entire optical film preparation process that require demolding are easy to demold.

[0331] The aforementioned optical film fabrication equipment utilizes a roller pressing device to create a first-generation soft mold prototype 610, forming a first strip-shaped prism on the prototype 610 that matches the first strip-shaped groove 301. Then, using the optical film fabrication equipment and the first-generation soft mold 600, multiple segments of second-generation soft mold units 710 are fabricated to be assembled, allowing the formation of second strip-shaped prisms on the second-generation soft mold units 710 that match the second strip-shaped grooves (located between two first strip-shaped prisms). Thus, a second-generation soft mold 700 is obtained by sequentially connecting multiple second-generation soft mold units 710 end-to-end along the arrangement direction of the second strip-shaped prisms. The arrangement direction of the multiple third strip-shaped grooves on the second-generation soft mold 700 is along the circumference of the second-generation soft mold 700. This allows the arrangement direction of the multiple third prisms formed on the substrate film 410 (i.e., the length direction of the finished optical film) to be along the conveying direction of the substrate film 410, while the length direction of the third prisms (i.e., the width direction of the finished optical film, where the substrate film 410 is shorter) is parallel to the axial direction of the main roller 510. Thus, even if the size of the substrate film 410 along the arrangement direction of the multiple third prisms is large, the substrate film 410 can remain flat during the rolling process. At the same time, since the second prism of the second-generation soft mold 700 contains a release agent, the surface energy of the mold is reduced, making it easier to demold the substrate film 410 after the third prisms are formed from the second-generation soft mold 700, thereby improving the quality of the finished optical film. Meanwhile, referring to the aforementioned analysis, the second-generation soft mold unit 710 is easy to demold from the first-generation soft mold 600, and the first-generation soft mold primary product 610 is easy to demold from the roller 310 of the rolling device. That is, all stages in the entire optical film preparation process that require demolding are easy to demold.

[0332] In one embodiment, the step of sequentially connecting multiple second-generation soft mold units 710 end-to-end along the arrangement direction of the second strip-shaped prism includes: connecting the multiple second-generation soft mold units 710 end-to-end along the arrangement direction of the second strip-shaped prism by laser splicing. This ensures good connection quality between the multiple second-generation soft mold units 710.

[0333] In some embodiments, the number of second-generation soft mold units 710 connected end to end in sequence can be two, three, or other numbers. The sides of any two adjacent second-generation soft mold units 710 are connected by laser splicing.

[0334] In one embodiment, the step of connecting the two ends of the first-generation soft mold prototype 610 along the length direction of the first strip prism includes: connecting the two ends of the first-generation soft mold prototype 610 along the arrangement direction of the first strip prism by laser splicing. This ensures that the two ends of the first-generation soft mold prototype 610 have good connection quality.

[0335] Please refer to Figure 38In one embodiment, the optical film preparation method further includes: before the step of sequentially connecting multiple second-generation soft mold units 710 end to end along the arrangement direction of the second strip prism, cutting the second-generation soft mold units 710 to reduce their size in the arrangement direction perpendicular to the second strip prism.

[0336] In some embodiments, the dimension of the second-generation soft mold unit 710 perpendicular to the arrangement direction of the second strip prism corresponds to the dimension in the width direction of the finished optical film. When fabricating the second-generation soft mold unit 710, the dimension of the second-generation soft mold unit 710 along the arrangement direction perpendicular to the second strip prism has redundant length to prevent insufficient dimension along this direction.

[0337] Before connecting multiple second-generation soft mold units 710 sequentially end to end along the arrangement direction of the second strip prism, the second-generation soft mold units 710 are cut off. Excess parts can be cut off to avoid the second-generation soft mold units 710 being too long along the arrangement direction perpendicular to the second strip prism. This helps to make the final optical film with a suitable size along this direction (i.e., the width of the optical film) and also makes the edges of the second-generation soft mold units 710 flat at the cutting position.

[0338] In one embodiment, the tension roller 520 and the main roller 510 can be simultaneously surrounded by the first-generation flexible mold 600, and tension the first-generation flexible mold 600. The pressure roller 530 and the main roller 510 are used to jointly press and convey the first-generation flexible mold 600 and the second flexible mold substrate 711. The injection device 540 injects a second adhesive between the first-generation flexible mold 600 and the second flexible mold substrate 711. The curing device 550 cures the second adhesive on the second flexible mold substrate 711 after rolling.

[0339] In one embodiment, the tension roller 520 and the main roller 510 can be simultaneously surrounded by the second-generation flexible mold 700, and tension the second-generation flexible mold 700. The pressure roller 530 and the main roller 510 are used to jointly press and convey the second-generation flexible mold 700 and the substrate film 410. The liquid injection device 540 is used to inject a third adhesive between the second-generation flexible mold 700 and the substrate film 410. The curing device 550 cures the third adhesive on the substrate film 410 after rolling to form a plurality of third strip-shaped prisms on the substrate film 410, the third strip-shaped prisms matching the second strip-shaped grooves.

[0340] Please refer to Figure 35 In some embodiments, the optical film preparation apparatus further includes a separation roller 560, located downstream of the curing device 550 along the transport direction of the substrate to be rolled. The separation roller 560 is used to change the transport direction of the substrate to be rolled after the adhesive has cured, so as to separate the substrate from the soft mold.

[0341] Understandably, the substrate to be rolled is bonded to the soft mold between the separating roller 560 and the pressure roller 530. The separating roller 560 can be mounted on a support structure. A drive unit can be configured to drive the separating roller 560 to rotate. The separating roller 560 can also be driven by a transmission mechanism, sharing a drive unit with any of the rollers among the main roller 510, tension roller 520, and pressure roller 530.

[0342] In this embodiment, the separation roller 560 facilitates the separation of the substrate to be rolled after the adhesive has cured from the flexible mold. For example, in step S200, during the process of conveying the second flexible mold substrate 711 by the main roller 510 and the pressure roller 530, the second flexible mold substrate 711 after the adhesive has cured can be simultaneously guided by the separation roller 560 to change the conveying direction, thereby separating it from the first-generation flexible mold 600. In step S300, during the process of conveying the substrate film 410 by the main roller 510 and the pressure roller 530, the substrate film 410 after the adhesive has cured can be simultaneously guided by the separation roller 560 to change the conveying direction, thereby separating it from the second-generation flexible mold 700.

[0343] Please refer to Figure 35 In some embodiments, the optical film preparation apparatus further includes a pre-coating roller 570, which is located outside the soft mold and rolls in cooperation with the soft mold, and the pre-coating roller 570 is partially immersed in the adhesive liquid in the liquid storage container 580.

[0344] The pre-coating roller 570 can be mounted on a support structure. A drive unit can be configured to drive the pre-coating roller 570 to rotate. The pre-coating roller 570 can also be driven by a transmission mechanism and share a drive unit with any of the rollers among the main roller 510, tension roller 520, pressure roller 530, and separation roller 560.

[0345] Since the pre-coating roller 570 is partially immersed in the adhesive in the liquid storage container 580, it can pick up the adhesive during rotation and apply it to the outer peripheral surface of the flexible mold. Thus, when the adhesive is injected between the flexible mold and the substrate to be rolled by the injection device 540, the adhesive can fully fill the grooves on the flexible mold because the outer peripheral surface of the flexible mold has been pre-coated with adhesive.

[0346] For example, in step S200, when the adhesive is injected between the first-generation soft mold 600 and the second soft mold substrate 711 by the injection device 540, the outer peripheral surface of the first-generation soft mold 600 has been pre-adsorbed with adhesive, so that the adhesive can fully fill the second strip groove on the first-generation soft mold 600, which is beneficial to make the second strip prism structure formed on the second soft mold substrate 711 complete.

[0347] In step S300, when the adhesive is injected between the second-generation soft mold 700 and the substrate film 410 by the injection device 540, the outer peripheral surface of the second-generation soft mold 700 has been pre-adsorbed with adhesive, so that the adhesive can fully fill the third strip groove on the second-generation soft mold 700, which helps to make the third strip prism structure formed on the substrate film 410 complete, thereby improving the quality of the optical film.

[0348] Please refer to Figure 35 In one embodiment, the optical film preparation apparatus further includes a guide roller 590, which is located inside the soft mold. The guide roller 590 and the pre-coating roller 570 together clamp and convey the soft mold.

[0349] The guide roller 590 can be mounted on a support structure. A drive unit can be configured to drive the guide roller 590 to rotate. The guide roller 590 can also be driven by a transmission mechanism and share a drive unit with any of the rollers among the main roller 510, tension roller 520, pressure roller 530, separation roller 560, and pre-coating roller 570.

[0350] By clamping and conveying the soft mold together with the guide roller 590 and the pre-coating roller 570, the operation of the soft mold can be stabilized during the conveying process. For example, in step S200, the guide roller 590 and the pre-coating roller 570 clamp and convey the first-generation soft mold 600, and in step S300, the guide roller 590 and the pre-coating roller 570 clamp and convey the second-generation soft mold 700.

[0351] In one embodiment, the optical film preparation equipment further includes a rolling device, which includes a roller 310, and the outer periphery of the roller 310 is provided with a plurality of first strip grooves 301 arranged sequentially along the axial direction.

[0352] If the length dimension (along the arrangement direction of the multiple third prisms) of the optical film to be prepared is small, the optical film can be directly prepared using a roller pressing device. The arrangement direction of the multiple third prisms is along the axial direction of the roller 310. Since the optical film size is small along this direction, the substrate film can remain flat, which can ensure the quality of the finished optical film.

[0353] Therefore, it can be seen that the optical film preparation equipment of this embodiment can guarantee the quality of the prepared optical film product, whether the optical film is short or long.

[0354] In other embodiments, the rolling device may not be part of the optical film preparation equipment described above, but rather a separate device from the optical film preparation equipment.

[0355] An embodiment of this application also provides an interactive display device, including: a glass cover plate, a display panel, a light-emitting element, and an optical composite film as described in any of the above embodiments. The glass cover plate is stacked above the light-emitting side of the display panel, and the glass cover plate has a concave surface facing inward toward the display panel; the glass cover plate is anti-glare glass, and its surface is provided with an anti-glare layer; the optical composite film is disposed on the light-incident side of the display panel, and the light-emitting element is located on the light-incident side of the optical composite film.

[0356] There are various ways to set the light-emitting elements of interactive display devices, including but not limited to:

[0357] There are multiple light-emitting elements, which are arranged in a matrix.

[0358] Alternatively, the number of light-emitting elements may be multiple, and the interactive display device may also include a reflective sheet and a light guide plate. Multiple light-emitting elements are disposed on the outer periphery of the light guide plate, the reflective sheet is stacked on the side of the optical composite film near the display panel, and the light guide plate is stacked between the reflective sheet and the optical composite film.

[0359] Specifically, interactive display devices (such as interactive smart boards, conference boards, and educational whiteboards) differ from the passive viewing mode of traditional televisions. Besides incorporating human-computer interaction functions like touch control, they also differ from traditional televisions in their usage scenarios. For example, televisions are primarily used in enclosed areas such as homes and indoor cinemas, where the range of ambient light transmission is very limited. Therefore, televisions do not consider the impact of ambient light (sufficient ambient light shining on the screen can cause reflections that obscure the viewer's vision) on the viewer. In educational and conference settings, the indoor lighting needs to be sufficient to ensure that the brightness of the light illuminating the tabletop is not lower than a preset standard. This results in ample ambient light in the indoor space. Interactive display devices are affected by ambient light, especially observers located at the widest viewing angle (the horizontal and vertical viewing angles are greater than or equal to 120° when the brightness at the center of the screen is reduced to 1 / 3). In other words, when the brightness at the center of the screen is reduced to 1 / 3, the widest viewing angle (including the horizontal viewing angle, which is the maximum angle at which a satisfactory image can be seen when tilted horizontally to the left and right from the front of the screen (0° viewing angle) and the vertical viewing angle, which is the maximum angle at which a satisfactory image can be seen when tilted vertically upwards and downwards from the front of the screen) is less than 120°, which cannot meet the viewing requirements.

[0360] In the interactive display device of the above embodiments, when designed for a wide viewing angle, the optical composite film 10 causes a certain degree of brightness attenuation at the forward viewing angle. Therefore, the brightness is maintained by increasing the number of light-emitting elements. Simultaneously, the arrangement of the light-emitting elements includes at least:

[0361] (1) Equally spaced matrix arrangement, with LED beads (light-emitting elements) arranged at equal intervals in the horizontal and vertical directions to ensure uniform brightness of the entire display area;

[0362] (2) Non-uniform arrangement with denser edges and sparser center. More light compensation is needed at the edges to improve overall uniformity;

[0363] (3) For the dense array arrangement of Mini LEDs. The number of LED beads (light-emitting elements) is extremely large and the density is high, which allows for fine-grained dimming in different zones.

[0364] This ensures sufficient brightness for the interactive display device when displaying from a wide viewing angle. Then, when the light emitted by the light-emitting element passes through the dimming film layer 12 in the optical composite film 10, the dimming structure 12a refracts and diffuses the light, causing some of the light to be deflected towards the wide viewing angle, thus achieving display brightness at a wide viewing angle. Subsequently, the light enters the display panel 40 and is modulated by the liquid crystal units within the display panel 40 to form an outgoing light distribution corresponding to the displayed image. The concave design of the glass cover 90 allows the light to be emitted more effectively towards the wider viewing angle when passing through the glass cover 90. After being emitted from the display panel 40, the outgoing light passes through the glass cover 90 and its surface anti-glare layer, thus reaching the viewer's eyes. The anti-glare layer converts specular reflection of ambient light into soft diffuse reflection, effectively suppressing glare and reflected light spots. This ensures that the increased brightness over a wide viewing angle is not interfered with or overwhelmed by strong ambient light reflection. Therefore, the aforementioned interactive display device ensures brightness by increasing the number and arrangement of light-emitting elements, uses the optical composite film 10 to ensure light divergence in the wide viewing angle direction, uses the concave glass cover 90 to perform secondary correction or optimization of light in the wide viewing angle direction, and uses the anti-glare layer of the glass cover 90 to reduce the reflection of ambient light hitting the surface of the interactive display device. In other words, multiple structures or modules work together to ensure that the brightness loss of the interactive display device in the wide viewing angle area of ​​120° does not exceed one-third, meeting viewing requirements.

[0365] Meanwhile, an anti-glare layer is applied to the cover glass of the interactive display device. The outer surface uses an AG layer to effectively suppress specular reflection caused by ambient light, while the inner surface uses an AR anti-reflection film. By utilizing the principle of optical interference cancellation, the intensity of reflected light at the interface is weakened. According to the law of conservation of energy, under the premise that the total light energy remains unchanged, the reflected light energy is reduced and the transmitted light energy is correspondingly increased.

[0366] Without the optical composite film layer, the anti-glare layer simply converts the specular reflection of ambient light hitting the cover glass into soft diffuse reflection, making the image on the interactive display device clearer for the observer. With the introduction of the optical composite film in the interactive display device of this application, the optical composite film redistributes light, effectively enhancing the brightness of the wide-viewing-angle area of ​​the interactive display device. Compared to interactive display devices without the optical composite film, the increased brightness of the wide-viewing-angle area of ​​the interactive display device of this application, and the light emitted by the display module passing through the anti-glare AR layer, can effectively increase the transmitted light energy, thereby increasing the transmitted light and making the user's view clearer. In other words, the light in the wide-viewing-angle area of ​​the interactive display device is enhanced under the action of the optical composite film. This results in a more outstanding viewing effect for the interactive display device with the support of the optical composite film and the anti-glare layer.

[0367] In addition, the interactive display device also includes infrared emitting units and infrared receiving units for implementing touch functionality. The infrared emitting and receiving units are arranged in pairs around the glass cover, forming an infrared light detection grid above the display area of ​​the glass cover. Because the glass cover has a concave surface towards the display panel, when a touch object (such as a finger or stylus) performs a touch operation on the concave surface of the glass cover, the concave surface makes the infrared blocking effect of the touch object more significant. This allows the infrared receiving unit to more sensitively receive weak blocking signals (such as rapid touches or slight movements), significantly enhancing the response capability to touch object blocking and improving infrared recognition accuracy.

[0368] Multiple light-emitting elements serve as the light source in the interactive display device, providing backlighting for the display panel.

[0369] In some embodiments, the light source is a direct-input light source, and multiple light-emitting elements are arranged in a matrix and located on the side of the optical composite film away from the display panel, so that the light emitted by the multiple light-emitting elements can enter the optical composite film.

[0370] In some embodiments, the light source is a side-lit light source. The interactive display device also includes a reflective sheet and a light guide plate. Multiple light-emitting elements are disposed on the outer periphery of the light guide plate. The reflective sheet is stacked on the side of the optical composite film near the display panel, and the light guide plate is stacked between the reflective sheet and the optical composite film. The light emitted by the multiple light-emitting elements enters the light guide plate from the side of the light guide plate. After being scattered by the microstructure inside the light guide plate and reflected by the reflective sheet, it is converted into a uniform surface light source and then shines into the optical composite film.

[0371] In one embodiment, the pixel density of the display panel is Pd, 40.1 PPI ≤ Pd ≤ 80.1 PPI; the average roughness of the anti-glare layer is Ra, 0.1 μm ≤ Ra ≤ 1 μm; the sharpness index (DOI) of the anti-glare glass is 50–85; and the haze of the anti-glare glass is 2%–15%.

[0372] Pixel density reflects the density of pixels on the display panel, while the average roughness of the anti-glare glass affects the light scattering effect. When the pixel density of the display panel and the average roughness of the anti-glare layer on the glass substrate meet the above range, the two match each other. The light that shines on the surface of the anti-glare layer will be more dispersed under the action of large-sized anti-glare particles, which is more conducive to improving the anti-glare effect of the anti-glare glass. It can ensure that the anti-glare glass can achieve the ideal anti-glare effect without adverse effects under the above pixel density, which can well meet the current screen requirements.

[0373] In some embodiments, if the Ra value is too high (above 1 μm), although it can meet the anti-glare requirements to a certain extent, the excessive roughness will cause too many irregular protrusions and depressions on the surface of the anti-glare layer. When light shines on these irregular surfaces, complex scattering will occur, causing some light to form flashes, affecting the clarity and uniformity of the displayed image. In addition, it will also lead to a worse feel. Moreover, to achieve good uniformity, increasing the roughness requires spraying a thicker anti-glare layer, which not only increases material costs but also reduces production efficiency. Conversely, if the Ra value is too low (below 0.1 μm), the surface of the anti-glare layer is too smooth, weakening the scattering effect on light and failing to effectively disperse light. As a result, in strong light environments, interactive display devices will still exhibit obvious reflections and glare, affecting the user's visual experience. Furthermore, when the pixel density is low (e.g., Pd less than 40.1 PPI), the light emitted from the screen is significantly affected by the anti-glare glass, resulting in a loss of screen clarity. This manifests as increased overall screen fogging, blurry images, and reduced transparency, leading to a noticeable deterioration in display quality. Conversely, when the pixel density is too high (e.g., Pd greater than 80.1 PPI), it becomes difficult to match the roughness range specified in this application, amplifying the roughness of the anti-glare glass and sacrificing the fine detail of high-pixel-density displays. By adjusting the average roughness of the anti-glare layer to meet the aforementioned range, the light scattering efficiency and uniformity can be altered. This allows for controllable diffuse reflection of the main incident light in conference / educational scenarios. When combined with the pixel density of large-size display devices, the emitted light from the pixels passes through the gaps between the anti-glare particles, improving the anti-glare effect while reducing the scattering impact of the anti-glare particles on the emitted light, thus minimizing the impact of the anti-glare layer on image quality.

[0374] In addition, sharpness reflects the clarity of the image reflected from the surface of the anti-glare glass. Setting the sharpness within the aforementioned range balances the anti-glare effect and display clarity. When the sharpness exceeds 85, it indicates that the surface of the anti-glare glass is too smooth, resulting in concentrated light reflection and a poor anti-glare effect, failing to effectively reduce glare. Conversely, when the sharpness is below 50, to achieve a certain anti-glare effect, the coating thickness of the anti-glare layer needs to be increased, leading to increased production costs and reduced production efficiency. This is because a thicker coating requires more material and a longer coating time, and may also affect the bonding strength and overall stability of the anti-glare layer with other layers.

[0375] Haze is a crucial indicator of the transparency and light scattering ability of anti-glare glass. When haze is below 2%, the anti-glare glass is almost ineffective at preventing glare, as light scattering on the glass surface is extremely low, easily leading to specular reflection and affecting viewing. When haze exceeds 15%, it means the anti-glare layer needs to be applied thicker to meet the required haze level, which increases production costs and efficiency. Thicker coatings not only require more raw materials but also extend the production cycle. Furthermore, greater coating thickness increases the impact on coating uniformity, potentially affecting the quality stability of the anti-glare glass due to uneven coating thickness, and increasing the difficulty of controlling coating uniformity.

[0376] From a manufacturing perspective, a higher Ra value indicates the need for a thicker anti-glare layer. This is because higher roughness requires more material to form the corresponding microstructure, which undoubtedly increases production costs. Furthermore, regarding the size ratio of pixels to glass particles, the closer the size ratio is to the size of the glass particles, the more prone flash point issues are to occurring. This solution achieves an optimal balance between display effect, anti-glare performance, production cost, and production efficiency in interactive display devices by rationally setting parameters such as display panel pixel density, average roughness of the anti-glare glass, sharpness, and haze. While ensuring good display effects, it effectively improves anti-glare performance, reduces production costs, and increases production efficiency.

[0377] In this application, average roughness (Ra) is a commonly used index to characterize surface roughness, used to describe the average degree of surface undulation. Ra refers to the arithmetic mean deviation of the profile, which is the arithmetic mean of the absolute values ​​of the distances from each point on the surface profile to the baseline. During the test, a profile curve of a certain length is taken on the surface, and the absolute values ​​of the distances from all profile points within that segment to the baseline are calculated using the profile centerline as the baseline. The arithmetic mean of these distances is then calculated, which is the Ra value of the segment to be tested. The smaller the Ra value, the smoother the surface. In some embodiments, 0.1μm ≤ Ra ≤ 1μm; for example, Ra can be a value within the range of 0.1μm, 0.2μm, 0.3μm, 0.4μm, 0.5μm, 0.6μm, 0.7μm, 0.8μm, 0.9μm, 1μm, or any two of these values; in some embodiments, 0.1μm ≤ Ra ≤ 0.3μm. Based on the above scheme, it is beneficial to further improve the anti-glare effect and display effect of anti-glare glass.

[0378] In some embodiments, 51.2 PPI ≤ Pd ≤ 67.8 PPI. Based on the above scheme, it is beneficial to further improve the anti-glare effect and display effect of the anti-glare glass.

[0379] In some embodiments, this application satisfies the above-mentioned range by adjusting the roughness of the anti-glare layer. The roughened anti-glare layer can cause non-uniform diffuse scattering of scattered light, which weakens glare while retaining some directional reflected light, thus balancing the anti-glare effect and sharpness of the anti-glare glass, and also helps to improve the haze of the anti-glare glass. In some embodiments, the anti-glare glass of this application can specifically meet at least one of the following requirements: (1) the sharpness of the anti-glare glass is 60 to 80; for example, the sharpness of the anti-glare glass is a value within the range of 60, 61, 63, 64, 66, 67, 68, 70, 72, 73, 74, 76, 78, 80 or any two of these values; (2) the haze of the anti-glare glass is 3% to 8%; for example, the haze of the anti-glare glass is a value within the range of 3%, 4%, 5%, 6%, 7%, 8% or any two of these values.

[0380] Sharpness of image refers to the clarity of an image reflected on a coating surface, usually expressed as a DOI (distinctness of image) value. It characterizes decorative properties of an object's surface, such as gloss, smoothness, and fullness. A higher sharpness of image indicates a clearer image and better decorative performance. Haze refers to the percentage of transmitted light intensity that deviates from the incident light angle by more than 2.5° from the total transmitted light intensity. Higher haze indicates greater material blur and a greater decrease in image clarity. When the sharpness of image and haze of anti-glare glass meet the above ranges, it can meet the clarity requirements of large-size display devices, reduce image loss, and improve both the anti-glare effect and display effect of interactive display devices.

[0381] In some embodiments, the anti-glare layer includes anti-glare particles; when the diameter of the anti-glare particles is 3μm to 80μm, the anti-glare particles are large-size anti-glare particles. The diameter of the large-size anti-glare particles can be within the range of 3μm, 8μm, 14μm, 17μm, 27μm, 29μm, 34μm, 41μm, 49μm, 53μm, 60μm, 67μm, 71μm, 77μm, 80μm, or any combination thereof. In the anti-glare glass of this application, the large-size anti-glare particles that meet the above diameter requirements can better disperse the irradiated light. Utilizing the controllable diffuse reflection effect of the large-size anti-glare particles, uniform dispersion of external incident light (anti-glare) and low-interference transmission of internal pixel emitted light (image quality preservation) are achieved, thus improving both the anti-glare performance and clarity of the interactive display device.

[0382] In some embodiments, the projected area of ​​large-sized anti-glare particles contained in a unit area of ​​the anti-glare layer accounts for 80% to 100% of the total area of ​​the unit area. For example, the proportion of the projected area of ​​large-sized anti-glare particles contained in a unit area of ​​the anti-glare layer to the total area of ​​the unit area is a value within the range of 80%, 81%, 82%, 84%, 85%, 87%, 89%, 91%, 93%, 95%, 96%, 98%, 100%, or any two of these values. The unit area is a rectangular area of ​​0.1mm × 0.1mm. The proportion of the projected area of ​​large-sized anti-glare particles contained in a unit area of ​​the anti-glare layer to the total area of ​​the unit area represents the area ratio of large-sized anti-glare particles in the anti-glare layer. When the above conditions are met, the large-sized anti-glare particles can form a uniformly uneven surface on a macroscopic scale, which is beneficial to enhancing the uniformity of diffuse reflection, reducing the probability of glare, and reducing image blurring caused by large particles. This is beneficial to further improve the anti-glare effect and display effect of the anti-glare glass, thereby improving both the anti-glare performance and clarity of the interactive display device.

[0383] It should be noted that the "diameter of the anti-glare particles" in this application refers to the maximum value of the straight line between any two points on the projected outline of the anti-glare particles on the anti-glare layer.

[0384] In some embodiments, the projected area of ​​large-sized anti-glare particles contained in a unit area of ​​the anti-glare layer accounts for 85% to 100% of the total area of ​​the unit area. When this condition is met, it is beneficial to further improve the anti-glare effect and display effect of the anti-glare glass, while also improving the anti-glare performance and clarity of interactive display devices.

[0385] This application also provides an anti-glare agent that can be used to make an anti-glare layer, the components of which, by mass fraction, include 6% to 15% silica sol, 30% to 50% hexafluoropropylene trimer, 0.1% to 0.5% hydrochloric acid, 2% to 5% fluoride, 2% to 5% water, and the balance being a solvent. In some embodiments, the components of the anti-glare agent, by mass fraction, may have the following values: silica sol mass fraction may be 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, or any combination thereof; hexafluoropropylene trimer mass fraction may be 30%, 32%, 34%, 35%, 37%, 38%, 40%, 42%, 43%, 44%, 46%, 47%, 50%, or any combination thereof; hydrochloric acid mass fraction may be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, or any combination thereof; fluoride mass fraction may be 2%, 3%, 4%, 5%, or any combination thereof; and water mass fraction may be 2%, 3%, 4%, 5%, or any combination thereof. When using the anti-glare agent of this application to prepare anti-glare glass, it is usually prepared by spraying. After spraying, the liquid substances in the anti-glare agent components evaporate quickly, while the solid substances remain and form large-sized anti-glare particles, which in turn form the anti-glare layer in the anti-glare glass.

[0386] When preparing anti-glare glass using the anti-glare agent of this application, a spraying method is typically employed. After spraying, the liquid components of the anti-glare agent evaporate rapidly, while the solid components remain and form large-sized anti-glare particles, thus forming the anti-glare layer in the anti-glare glass. Compared to other anti-glare agents in the prior art, the anti-glare agent of this application has a higher concentration of hexafluoropropylene trimer and a lower ethanol content. Therefore, the anti-glare agent evaporates more slowly during spraying, and the formation and setting of large-sized anti-glare particles is also slower. The resulting large-sized anti-glare particles not only have a smoother feel but also do not easily form surface dust. This eliminates the need for subsequent polishing to improve the feel and remove surface dust from the prepared anti-glare glass.

[0387] In addition, in the anti-glare agent of this application, silica sol, as the base solute, ensures a relatively uniform anti-glare layer coating after spraying; hydrochloric acid and fluoride act as catalysts and aging agents, while water acts as a leveling agent, reducing the solute aggregation rate and facilitating the formation of the anti-glare layer in the anti-glare glass of this application. As an example, in some embodiments of this application, the solvent is typically one of three types of solvents, such as ethanol, ethyl acetate, acetone, etc.; the fluoride can be at least one of sodium fluoride and ammonium bifluoride; furthermore, the solid content of the anti-glare agent of this application can be 12% to 25%, for example, values ​​within the range of 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, or any combination thereof.

[0388] Furthermore, the manufacturing process of the anti-glare agent in this application generally includes the following steps:

[0389] 1. Mix ethanol, silica sol, hexafluoropropylene trimer, and fluoride according to the proportions specified in the anti-glare agent and stir until homogeneous.

[0390] 2. Then heat and maintain the temperature at 60℃, while adding hydrochloric acid and stirring, and at the same time slowly inject 2% to 5% deionized water.

[0391] 3. After stirring for 3 to 5 hours, test the pH value. When the pH value is 2 to 5, stop adding hydrochloric acid and stop heating. Continue stirring until the temperature drops to 35℃ to 45℃, and continue stirring for 10 to 20 minutes.

[0392] 4. Let it stand and mature for 6-10 hours until the temperature drops to room temperature (25℃~30℃).

[0393] 5. Filter the above mixed solution using meltblown fabric to obtain the anti-glare agent.

[0394] If not used temporarily, the anti-glare agent should be bottled and sealed, and stored in an environment below 8°C.

[0395] In this application, the steps for preparing anti-glare glass using the anti-glare agent of this application are as follows:

[0396] S100. Apply an anti-glare agent to one surface of a glass substrate using a spraying machine.

[0397] In this step, the spraying machine typically operates at a pressure of 5MPa to 10MPa, a flow rate of 150g / min to 200g / min, and a conveyor belt speed of 500mm / min to 1000mm / min. In some embodiments, when the sprayer is spraying, the pressure can be a value within the range of 5MPa, 6MPa, 7MPa, 8MPa, 9MPa, 10MPa or any two of these values; the flow rate can be a value within the range of 150g / min, 160g / min, 170g / min, 180g / min, 190g / min, 200g / min or any two of these values; and the conveyor belt speed can be a value within the range of 500mm / min, 530mm / min, 570mm / min, 610mm / min, 630mm / min, 660mm / min, 710mm / min, 760mm / min, 780mm / min, 820mm / min, 850mm / min, 900mm / min, 950mm / min, 980mm / min, 1000mm / min or any two of these values. Compared to existing technologies, the pressure, flow rate, and conveyor belt speed in this application are higher because the anti-glare agent in this application is less volatile. Improving the preparation parameters of each step can not only ensure the production of anti-glare glass with better anti-glare effect, but also improve production efficiency.

[0398] In addition, the glass substrate in this step is usually prepared from a glass sheet. The glass sheet is generally prepared by going through steps such as cutting, edge grinding, cleaning, tempering and cleaning in sequence to form a glass substrate to be sprayed. The specific process of preparing the glass substrate from the glass sheet will not be described in detail here.

[0399] S200, bake until the anti-glare agent on the glass substrate forms anti-glare particles.

[0400] In this step, the baking temperature is typically 200℃ to 250℃, and the baking time is typically 30 min to 50 min. In some embodiments, the baking temperature can be a value within the range of 200℃, 210℃, 220℃, 230℃, 240℃, 250℃, or any combination thereof, and the baking time can be a value within the range of 30 min, 35 min, 40 min, 45 min, 50 min, or any combination thereof. This allows the anti-glare agent to cure smoothly, forming anti-glare particles. In this application, the anti-glare particles include resin particles and silica particles.

[0401] In some embodiments, the average roughness Ra of the anti-glare layer can be controlled by adjusting the flow rate of the sprayer and the conveyor belt speed during spraying. For example, within the scope of this application, increasing the spray flow rate or decreasing the conveyor belt speed can increase the average roughness Ra of the anti-glare layer, and vice versa.

[0402] In some embodiments, by adjusting the particle diameter of the silica sol in the anti-glare agent, or by adjusting the flow rate and conveyor belt speed of the sprayer during spraying, the diameter of the anti-glare particles in the anti-glare layer can be controlled, thereby controlling the area ratio of large-size anti-glare particles in the anti-glare layer. For example, increasing the particle diameter of the silica sol in the anti-glare agent, or increasing the spray flow rate within the scope of this application, or decreasing the conveyor belt speed, can increase the overall diameter of the anti-glare particles in the anti-glare layer; conversely, decreasing the particle diameter of the silica sol in the anti-glare agent, or decreasing the spray flow rate within the scope of this application, or increasing the conveyor belt speed, can decrease the overall diameter of the anti-glare particles in the anti-glare layer. By controlling the diameter of the anti-glare particles in the anti-glare layer, the number of large-size anti-glare particles can be controlled, thereby controlling the area ratio of large-size anti-glare particles in the anti-glare layer.

[0403] Example

[0404] The following examples and comparative examples illustrate some embodiments of the implementation of this application. Various tests and evaluations were performed according to the methods described below. Furthermore, unless otherwise specified, "parts" and "%" are quality standards.

[0405] Test methods and equipment

[0406] Measurement of parameters for large-size anti-glare particles:

[0407] Use a 1000x magnifying glass (Keyence, VHX-X1 series, Japan) to observe any unit area (a rectangular area with a length and width of 0.1mm) of the anti-glare layer of the anti-glare glass under test.

[0408] Ten unit areas were randomly selected as test samples, and the maximum value of the straight line between any two points on the projected contour of a single anti-glare particle on the anti-glare layer in each unit area was measured. This value was taken as the diameter of the corresponding anti-glare particle. When the diameter of the anti-glare particle was between 3μm and 80μm, it was designated as a large-size anti-glare particle. Then, the percentage of the projected area of ​​the large-size anti-glare particle in each unit area was calculated to represent the total area of ​​the corresponding unit area. The arithmetic mean of these projected area percentages was recorded as the percentage of the projected area of ​​the large-size anti-glare particle contained in the unit area of ​​the anti-glare layer to the total area of ​​the unit area.

[0409] Ra test:

[0410] Five profile curves were randomly selected on the anti-glare layer of the anti-glare glass to be tested. The Ra values ​​of the five profile curves were tested using a surface roughness measuring instrument (Mitutoyo, Japan, model SJ-210). The average Ra value of the five curves was then calculated, which is the average roughness Ra of the anti-glare layer in the anti-glare glass.

[0411] Visibility test:

[0412] The interactive display devices of each embodiment or comparative example were tested. First, both surfaces of the sample were cleaned until visually free of dirt, fingerprints, dust, and scratches. Test conditions were controlled as follows: ambient temperature 23℃±2℃, relative humidity 50%±5%. After calibrating a RHOPOINT multi-function gloss meter (model: IQ206085), tests were conducted at the four corners of the anti-glare glass of the interactive display device (20cm from the edge) and at the center. DOI data were recorded at five points, and the average value was calculated as the result. A higher DOI value indicates a clearer reflected image and better decorative performance of the anti-glare glass.

[0413] Haze test:

[0414] The experimental apparatus mainly consists of a standard C-light source, a condenser lens, a sample holder, an integrating sphere, a standard white board, a trap, a photocell, and a galvanometer. The samples used are anti-glare glass from the various embodiments or comparative examples, and the tests were conducted using a Shanghai Shenguang WGT-S / haze meter. When a beam of light shines on an object, part of the light is reflected by the surface, part is absorbed by the object's interior, and part passes through the object. The proportion of these three parts depends on the surface and internal properties of the object. For transparent glass samples, most of the incident light passes through, but the transmitted light is divided into direct and scattered parts. The ratio of these parts is related to the internal properties of the sample material. The higher the proportion of direct light, the better the transparency of the material; the higher the proportion of scattered light, the more pronounced the turbidity of the material, i.e., the greater the haze.

[0415] Example 1-1

[0416] <Ingredients of anti-glare agents>

[0417] By mass fraction, it comprises 10% silica sol, 50% hexafluoropropylene trimer, 0.1% hydrochloric acid, 5% fluoride, 5% water, and the remainder is ethanol. The fluoride is a 1:1 mass ratio of sodium fluoride and ammonium hydrogen fluoride.

[0418] <Preparation of Anti-Glare Glass>

[0419] Anti-glare agent was sprayed onto one surface of a glass substrate using a spraying machine. The spraying pressure was 5 MPa, the flow rate was 150 g / min, and the conveyor belt speed was 500 mm / min.

[0420] After spraying, the coating is baked until the anti-glare agent forms anti-glare particles, thus producing anti-glare glass; the baking temperature is 200℃ and the baking time is 50 minutes.

[0421] Anti-glare glass includes an anti-glare layer containing large-sized anti-glare particles with a diameter ranging from 3μm to 80μm. These large-sized anti-glare particles, meeting the aforementioned diameter requirements, effectively disperse incident light. Utilizing the controllable diffuse reflection effect of these large-sized anti-glare particles, uniform dispersion of external incident light (anti-glare) and low-interference transmission of light emitted from internal pixels (image quality preservation) are achieved, thus improving both the anti-glare performance and clarity of interactive display devices.

[0422] <Preparation of Interactive Display Devices>

[0423] The anti-glare glass and display panel are bonded together using frame adhesive (fitted around the edges with an air gap in the center). The assembly formed by the anti-glare glass and display panel is then fixed to the frame using clamps, and finally combined with the back panel to obtain the interactive display device. The display panel is 110 inches in size, with a resolution of 3840×2160 and a pixel density of 40.1 PPI.

[0424] Examples 1-2 to 1-11, Comparative Examples 1-1 to 1-2

[0425] The difference compared to Example 1-1 is as follows:

[0426] The pixel density of the display panel, the Ra of the anti-glare layer of the interactive display device, the vividness, and the haze were adjusted according to Table 1. Specific adjustments and performance test results are shown in Table 1. Specifically, increasing the spray flow rate increased the average roughness Ra of the anti-glare layer; controlling the particle diameter of the silica sol in the anti-glare agent increased the proportion of large-size anti-glare particles in the total anti-glare particles, thereby regulating the proportion of the projected area of ​​large-size anti-glare particles to the total area of ​​the unit area. The display panels in Examples 1-5 were 86 inches in size, those in Examples 1-6 were 65 inches in size, and those in Examples 1-7 were 55 inches in size, all with a resolution of 3840×2160.

[0427] If the average roughness of the glossy glass is too low, the surface of the anti-glare layer will be too smooth, weakening its light scattering effect and failing to effectively disperse light. This results in noticeable glare and reflections on the interactive display device even in strong light environments, affecting the user's visual experience. In contrast, the anti-glare glass in Examples 1-2 has a suitable average roughness Ra, which can disperse the light hitting the surface of the anti-glare layer, thus improving the anti-glare effect of the anti-glare glass. Table 1

[0428] As shown in the table, this application, based on a pixel density Pd of 40.1 PPI ≤ Pd ≤ 80.1 PPI for the display panel, adjusts the average roughness Ra of the anti-glare layer to meet 0.1 μm ≤ Ra ≤ 1 μm, achieving a sharpness of 50–83 and a haze of 2.6%–15%. Both sharpness and haze values ​​are excellent, thus the interactive display device of this application can achieve both excellent anti-glare and display effects. In contrast, Comparative Example 1-1, with an average roughness Ra of 0.07 μm, exhibits a sharpness as high as 95, indicating poor anti-glare performance. Comparative Example 1-2, with an average roughness Ra of 1.1 μm, has a haze as high as 17.1%, which severely affects the clarity of the displayed image. This application, by adjusting the average roughness Ra of the anti-glare layer to meet the above range, can match large-size interactive display devices with the aforementioned pixel density, keeping sharpness and haze within a suitable range, thus improving both the anti-glare effect and clarity of the interactive display device. In particular, when the requirement of 0.1μm≤Ra≤0.3μm is met, the anti-glare effect and clarity of interactive display devices can be further improved.

[0429] Specifically, when the projected area of ​​large-sized anti-glare particles within a unit area accounts for 80% to 100% of the total area of ​​that unit area, it helps to enhance the uniformity of diffuse reflection and reduce image blurring caused by large particles, thereby improving both the anti-glare performance and clarity of the interactive display device. In particular, when the projected area of ​​large-sized anti-glare particles within a unit area accounts for 85% to 100% of the total area of ​​that unit area, it can further improve the anti-glare performance and clarity of the interactive display device.

[0430] Examples 2-1 to 6-9

[0431] The difference from Example 1-1 is that the particle diameter of the silica sol in the anti-glare agent was increased, and the flow rate and conveyor belt speed during spraying were controlled according to Table 2 (the examples in Table 2 are numbered in the form of "Example XY"). The performance test results of the anti-glare layer Ra, sharpness, and haze of the interactive display device are shown in Table 2. Among them, when the anti-glare layer Ra of the interactive display device meets the requirements of 0.1μm≤Ra≤0.3μm, the sharpness of the anti-glare glass is 55-85, and the haze of the anti-glare glass is 2%-15%, the interactive display device is considered qualified, and the performance test result is recorded as OK; otherwise, it is considered unqualified, and the result is recorded as NG. Table 2

[0432] As shown in Table 2, the spraying flow rate during the preparation of the anti-glare layer in this application is 150g / min to 200g / min, and the conveyor belt speed is 500mm / min to 1000mm / min. This allows the average roughness Ra of the anti-glare layer to be controlled to meet the requirements of 0.1μm≤Ra≤0.3μm, the sharpness of the anti-glare glass to be 55 to 85, and the haze of the anti-glare glass to be 2% to 15%. This facilitates compatibility with large-size display panels, enabling interactive display devices to achieve ideal anti-glare effects during application, reducing the likelihood of flickering and improving the clarity and uniformity of the displayed image, thus enhancing the user's visual experience. Furthermore, the inventors discovered that when the spraying flow rate is less than 150 g / min, for example, 140 g / min, although a suitable average roughness Ra parameter can be achieved, the anti-glare glass exhibits uneven appearance, failing to meet mass production requirements. When the conveyor belt speed during spraying exceeds 1000, for example, above 1100, the anti-glare glass also exhibits stripe defects, affecting its application in interactive display devices. This application controls the spraying flow rate to 150 g / min to 200 g / min and the conveyor belt speed to 500 mm / min to 1000 mm / min, improving the speed and uniformity of the spraying process while simultaneously enhancing mass production efficiency and appearance yield. This achieves the optimal balance between display effect, anti-glare performance, production cost, and production efficiency in interactive display devices, effectively improving anti-glare performance, reducing production costs, and increasing production efficiency while ensuring good display effects.

[0433] In one embodiment, the pixel density of the display panel is Pd, where 40.1 PPI ≤ Pd ≤ 80.1 PPI;

[0434] The DOI of anti-glare glass is 20 to 40;

[0435] The haze of the anti-glare glass is 10% to 20%;

[0436] The light transmittance of the anti-glare glass is greater than 88%;

[0437] The Ra of the anti-glare layer is 0.3 μm to 0.5 μm.

[0438] In the above embodiments, the pixel density of the display panel is Pd, 40.1PPI≤Pd≤80.1PPI; the DOI of the anti-glare glass is 20 to 40; the haze of the anti-glare glass is 10% to 20%; the light transmittance of the anti-glare glass is greater than 88%; and the Ra of the anti-glare layer is 0.3μm to 0.5μm.

[0439] This embodiment achieves a deep balance between "anti-glare effect" and "display effect" by precisely matching and synergistically controlling five core parameters: pixel density (Pd) of the display panel, sharpness of reflection (DOI) of the anti-glare glass, haze, surface roughness (Ra), and light transmittance, while also optimizing the touch operation feel. In some embodiments, the inventors discovered that pixel density is the benchmark for display clarity of the display panel, and its range needs to be adapted to the usage scenarios of interactive display devices in fields such as conferencing and education. Surface roughness Ra is a core structural parameter that determines the optical properties of the anti-glare glass; its micro-roughness affects the values ​​of haze and DOI, and is also related to the display adaptability of pixel density. When the pixel density Pd is between 40.1 PPI and 80.1 PPI, and Ra is between 0.3 μm and 0.5 μm, a "moderately raised microstructure" is formed on the glass surface. This avoids insufficient diffuse reflection due to excessively small roughness (Ra < 0.3 μm) or excessive diffuse reflection due to excessively large roughness (Ra > 0.5 μm). It also matches the pixel density, preventing the surface roughness of the anti-glare glass from amplifying pixel graininess when the pixel density is too low, and highlighting the uneven surface roughness of the anti-glare glass when the pixel density is too high, resulting in glaring flashes. Through this combination of surface roughness and pixel density, excellent anti-glare performance is achieved while reducing excessive scattering of light emitted from the screen, minimizing optical interference with the display effect, and creating a gentle touch damping feel, improving operational comfort.

[0440] In addition, anti-glare glass that meets the above surface roughness requirements can provide a basis for controlling haze at 10% to 20%, DOI at 20 to 40, and light transmittance > 88%. The haze essentially reflects the ability of the microstructure with the aforementioned surface roughness to scatter light. When the surface roughness Ra is between 0.3μm and 0.5μm, although it is conducive to forming suitable diffuse reflection, there may still be unevenness. If the local roughness is too low, it will cause dazzling flashes, and if it is too high, it will affect the light emitted from the screen. This application further controls the haze to be between 10% and 20%, which can correct the diffuse reflection ability of the surface roughness, fully disperse the high-intensity incident light, decompose it into soft diffuse reflection light in multiple directions, avoid the flashing problem, and reduce the scattering loss of the light emitted from the screen, thereby improving the brightness and clarity of the image. It can weaken the direct glare of external ambient light (such as lamps and window light) through scattering, and will not cause the image to become foggy due to excessive scattering. This haze range is highly compatible with the pixel density of this application, avoiding the double blurring of "graininess + fogging" caused by the superposition of low pixel density and high haze, and will not make the small imperfections on the anti-glare surface that is prominent due to high pixel density more obvious due to low haze. Light transmittance determines the effective utilization rate of the light emitted from the screen. The aforementioned haze range leads to a small amount of light scattering loss, but light transmittance within this range can precisely offset this loss, ensuring sufficient brightness and accurate color saturation of the emitted light, avoiding a dark image, and improving image visibility. DOI (Distinctive Image Quality) measures the sharpness of the reflected image from the anti-glare glass, and its range needs to be controlled in conjunction with Ra, haze, and light transmittance. When DOI is between 20 and 40, the reflected image of external light is "blurred but not dark," avoiding both specular glare (DOI > 40, excessively sharp reflection) and an overall hazy screen (DOI < 20, excessively blurry reflection), perfectly balancing anti-glare effect and display clarity. Furthermore, this DOI range can be coordinated with pixel density, avoiding the loss of display details due to low pixel density + low DOI, and preventing high DOI from causing reflective glare that affects the display effect of high pixel density.

[0441] This application utilizes the synergistic effect of five parameters—surface roughness (Ra), pixel density, haze, DOI, and transmittance—to transform specular reflection of ambient light into soft diffuse reflection, preventing glare on the screen surface. It also eliminates glare due to changing viewing angles, ensuring stable visibility over wide viewing angles. Furthermore, it reduces the impact of scattering on emitted light, guaranteeing a grain-free image and clear text and image details. Balancing excellent anti-glare and display performance, this application addresses the pain points of traditional interactive display devices—"anti-glare leads to fogging, clear display leads to glare"—and achieves a comprehensive improvement in user experience, including "visibility under strong light, clarity at medium to long distances, and smooth touch operation."

[0442] In some embodiments of this application, the DOI of the anti-glare glass is 20 to 40; in some embodiments, the DOI of the anti-glare glass is 27 to 38; for example, the DOI of the anti-glare glass is a value within the range of 20, 21, 23, 24, 25, 27, 28, 30, 32, 33, 35, 36, 37, 39, 40, or any combination thereof. DOI reflects the clarity and edge sharpness of the reflected image from the anti-glare glass. Its value is determined by the "directivity control capability of reflected light" of the anti-glare glass surface and is related to the internal defects, material composition, surface roughness, haze, and light transmittance of the anti-glare glass. When the DOI of the anti-glare glass meets the above range, it is beneficial to further improve both the anti-glare effect and the display effect of the interactive display device.

[0443] In some embodiments of this application, the haze of the anti-glare glass is 10% to 20%; in other embodiments, the haze is 13% to 18%; for example, the haze of the anti-glare glass is a value within the range of 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, or any combination thereof. Haze refers to the degree of light scattering produced by glass when transmitting light, resulting in blurred vision. Haze is related to the internal defects, surface roughness, and material composition of the glass. High haze means more light scattering, thereby reducing transparency. Adjusting the haze to meet the above range is beneficial for further balancing the anti-glare effect and display effect of interactive display devices.

[0444] In some embodiments of this application, the transmittance of the anti-glare glass is greater than 88%; in other embodiments, the transmittance of the anti-glare glass is between 89% and 93%; for example, the transmittance of the anti-glare glass is a value within the range of 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, or any combination thereof. Exemplarily, the transmittance of the anti-glare glass can be measured by spectral transmission method. Transmittance refers to the efficiency of light transmission, which has a significant impact on display brightness and color reproduction, and is related to the internal defects, surface roughness, haze, and material composition of the glass. Adjusting the transmittance within the above range is beneficial for further balancing and improving the anti-glare effect and display effect of interactive display devices.

[0445] In some embodiments of this application, the Ra of the anti-glare layer is 0.3 μm to 0.5 μm; in other embodiments, the Ra of the anti-glare layer is 0.35 μm to 0.4 μm. For example, the Ra of the anti-glare layer is a value within the range of 0.3 μm, 0.31 μm, 0.33 μm, 0.33 μm, 0.35 μm, 0.37 μm, 0.39 μm, 0.41 μm, 0.43 μm, 0.44 μm, 0.45 μm, 0.47 μm, 0.49 μm, 0.5 μm, or any two of these values. In this application, average roughness (Ra) is an index characterizing surface roughness, used to describe the average degree of surface undulation. Ra refers to the arithmetic mean deviation of the profile, which is the arithmetic mean of the absolute values ​​of the distances from each point on the measured surface profile to the reference line. During the test, a certain length of the surface contour curve is taken, and the absolute values ​​of the distances from all contour points within this segment to the baseline are calculated using the center line of the contour as the baseline. The arithmetic mean of these distances is then calculated, which is the Ra value of the segment under test. The smaller the Ra value, the smoother the surface. Adjusting Ra within the above range is beneficial for further improving both the anti-glare effect and the display effect of interactive display devices.

[0446] In some embodiments of this application, the pencil hardness of the anti-glare layer is ≥9H. This allows the anti-glare layer in this application to have high hardness, which is beneficial for reducing scratches on the anti-glare layer and the anti-glare glass with this layer during use, and for improving product stability. It should be noted that the pencil hardness of the anti-glare layer can be adjusted by changing the rigidity of the resin matrix and the rigidity of the particles; however, this is not a major improvement of this application and will not be further elaborated here. Exemplarily, the pencil hardness of the anti-glare layer can be determined by applying a force of 75g according to the national standard coating surface hardness test method.

[0447] In some embodiments of this application, the pixel density of the display panel satisfies: 51.2 PPI ≤ Pd ≤ 67.8 PPI.

[0448] Based on the above solution, it is beneficial to further improve both the anti-glare effect and the display effect of interactive display devices.

[0449] In some embodiments of this application, the anti-glare layer includes anti-glare particles with a diameter of D. When 5μm≤D≤100μm, the anti-glare particles are large-sized anti-glare particles. Based on the total area of ​​the anti-glare layer, the area ratio of large-sized anti-glare particles is 80% to 100%. The diameter of the large-size anti-glare particles can be within the range of 5μm, 8μm, 14μm, 17μm, 27μm, 29μm, 34μm, 41μm, 49μm, 53μm, 60μm, 67μm, 71μm, 77μm, 80μm, 83μm, 87μm, 92μm, 96μm, 100μm or any two of these values; based on the total area of ​​the anti-glare layer, the area ratio of the large-size anti-glare particles is within the range of 80%, 81%, 82%, 84%, 85%, 87%, 89%, 91%, 93%, 95%, 96%, 98%, 100% or any two of these values. This application incorporates large-sized anti-glare particles in the anti-glare layer. When the area ratio meets the aforementioned conditions, the larger surface area allows for more effective scattering of light, dispersing it to a wider angle, reducing the intensity of specular reflection, and preventing localized reflective spots. Furthermore, these large-sized anti-glare particles also reduce the impact on screen-emitted light, preventing excessive absorption of screen-emitted light, and ensuring the brightness, clarity, and color accuracy of the displayed image. This approach simultaneously improves both the anti-glare effect and the display performance of interactive display devices.

[0450] In some embodiments of this application, the diameter of the anti-glare particle refers to the distance between the two furthest points on the outline of the anti-glare particle projected onto the anti-glare layer along the thickness direction of the anti-glare layer. In some embodiments, several test areas can be randomly selected, such as 10 rectangular areas of 0.1mm × 0.1mm. The diameter of the anti-glare particles in the test areas is first counted to determine the large-size anti-glare particles. The large-size anti-glare particles are all treated as ideal spheres, and the maximum cross-sectional area of ​​each large-size anti-glare particle is calculated. Then, the areas of the large-size anti-glare particles are added together to obtain the total area of ​​the large-size anti-glare particles, and then the total area ratio of the large-size anti-glare particles in the anti-glare layer is calculated.

[0451] In some embodiments of this application, the area ratio of large-size anti-glare particles is 85% to 100% based on the total area of ​​the anti-glare layer. Based on the above solution, it is possible to further improve both the anti-glare effect and the display effect of the interactive display device.

[0452] In some embodiments of this application, the large-size anti-glare particles include first anti-glare particles and second anti-glare particles. When 5μm ≤ D ≤ 60μm, the anti-glare particles are first anti-glare particles; when 60μm < D ≤ 100μm, the anti-glare particles are second anti-glare particles. The area ratio of the first anti-glare particles to the second anti-glare particles is 1:(0.4 to 0.7). For example, the area ratio of the first anti-glare particles to the second anti-glare particles is a value within the range of 1:0.4, 1:0.5, 1:0.6, 1:0.7, or any two of these ratios. The inventors discovered that the first anti-glare particle, which meets the above particle size conditions, is relatively small and has a more refined light scattering effect, thus better suppressing local glare. The second anti-glare particle is larger and can improve the efficiency of light scattering and expand the angle of light scattering. The combination of the two can enable the anti-glare layer to scatter light at different scales, further improving the distribution breadth and uniformity of scattered light, and reducing the impact on the light emitted from the screen. This helps maintain the brightness and color reproduction of the displayed image, thereby further improving the anti-glare effect and display effect of interactive display devices.

[0453] In some embodiments of this application, the thickness of the anti-glare layer is between 2 μm and 6 μm. Based on this approach, both the anti-glare effect and the display effect of the interactive display device can be further improved. Exemplarily, the thickness of the anti-glare layer is 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, 5 μm, 5.5 μm, 6 μm, or a range between any two of the above values.

[0454] In some embodiments of this application, the average diameter of the large-sized anti-glare particles is between 15 μm and 50 μm. Exemplarily, the average diameter of the large-sized anti-glare particles can be a value within the range of 15 μm, 17 μm, 27 μm, 29 μm, 34 μm, 41 μm, 49 μm, 50 μm, or any combination thereof. The average diameter of the large-sized anti-glare particles refers to the arithmetic mean of the diameters of the large-sized anti-glare particles in the anti-glare layer. This can be achieved by randomly selecting several test areas, such as ten 0.1 mm × 0.1 mm rectangular areas, and calculating the arithmetic mean of the diameters of the large-sized anti-glare particles in the test areas, which is then denoted as the average diameter of the large-sized anti-glare particles. Based on this scheme, both the anti-glare effect and the display effect of the interactive display device can be further improved.

[0455] In some embodiments of this application, the anti-glare particles include resin particles and glass particles; the glass particles are secondary particles formed by the aggregation of several nano-liquid glass agglomerates. Based on this scheme, it is possible to further improve both the anti-glare effect and the display effect of interactive display devices.

[0456] This application also provides a method for preparing the aforementioned anti-glare glass, which includes at least the following steps:

[0457] An anti-glare coating is sprayed onto one surface of a glass substrate using a spraying machine, and then baked until the anti-glare agent forms anti-glare particles located on the side of the glass substrate facing away from the display panel. The anti-glare coating includes nano-liquid glass. During spraying, the pressure is 5 MPa to 10 MPa, the flow rate is 150 g / min to 200 g / min, and the conveyor belt speed is 500 mm / min to 1000 mm / min. During baking, the baking temperature is 200°C to 250°C, and the baking time is 20 min to 40 min.

[0458] Based on the above preparation method, anti-glare glass can have suitable roughness Ra, haze, and light transmittance, achieving a balance between improving the anti-glare effect and display effect of interactive display devices. Furthermore, the anti-glare layer in this application has a dynamic friction coefficient of 0.8 to 1.4, an Ra of 0.2 to 0.4, a gloss level of 45 to 65, a haze level of 10 to 20, and a light transmittance greater than 88%, thus giving the AG glass with the anti-glare layer better feel and optical performance.

[0459] In some embodiments, when the spraying machine is spraying, the pressure is typically 5MPa to 10MPa, the flow rate is 150g / min to 200g / min, and the conveyor belt speed is 500mm / min to 1000mm / min. In some embodiments, when the sprayer is spraying, the pressure can be a value within the range of 5MPa, 6MPa, 7MPa, 8MPa, 9MPa, 10MPa or any two of these values; the flow rate can be a value within the range of 150g / min, 160g / min, 170g / min, 180g / min, 190g / min, 200g / min or any two of these values; and the conveyor belt speed can be a value within the range of 500mm / min, 530mm / min, 570mm / min, 610mm / min, 630mm / min, 660mm / min, 710mm / min, 760mm / min, 780mm / min, 820mm / min, 850mm / min, 900mm / min, 950mm / min, 980mm / min, 1000mm / min or any two of these values. Compared to existing technologies, the pressure, flow rate, and conveyor belt speed in this application are higher because the anti-glare agent in this application is less volatile. Improving the preparation parameters of each step can not only ensure the production of anti-glare glass with better anti-glare effect, but also improve production efficiency.

[0460] In some embodiments, the baking temperature is typically 200°C to 250°C, and the baking time is typically 30 min to 50 min. In some embodiments, the baking temperature can be a value within the range of 200°C, 210°C, 220°C, 230°C, 240°C, 250°C, or any combination thereof, and the baking time can be a value within the range of 30 min, 35 min, 40 min, 45 min, 50 min, or any combination thereof. Based on the above scheme, the anti-glare agent can be successfully cured to form anti-glare particles.

[0461] For example, the anti-glare particles may include resin particles and glass particles. The glass particles include silica particles. An anti-glare layer with silica particles can form a microstructure on the glass surface, scattering incident light and thus significantly reducing the intensity of reflected light and glare. Simultaneously, the silica particles maintain the high transparency of the glass, without affecting the screen's brightness and color performance. Furthermore, silica has excellent hardness and chemical stability, giving the anti-glare layer good wear resistance and durability, enabling it to maintain its function for a long time.

[0462] In some embodiments of this application, the coating used to prepare the anti-glare layer includes a resin matrix, nano-liquid glass, a solvent, a defoamer, a leveling agent, a dispersant, and a wetting agent. The nano-liquid glass is used to form the glass particles in the anti-glare layer. Nano-liquid glass refers to a liquid glass material with nanoscale particles. By introducing nanoscale particles or clusters into the glass, nano-liquid glass achieves a higher surface area and greater interfacial effects. The resin matrix is ​​mainly used to bind the particles, defoamer, leveling agent, dispersant, and wetting agent in the raw materials to form a unified structure. The solvent is used to adjust the viscosity of the coating to facilitate application; for example, adjusting the viscosity makes the coating suitable for spraying processes. The defoamer is mainly used to reduce or eliminate bubbles generated during the production, storage, and application of the coating. The leveling agent is mainly used to help the coating form a smooth, uniform surface after application. The dispersant is mainly used to help the particles disperse uniformly in the coating (e.g., in the resin matrix). By improving the dispersibility of the particles, the dispersant can increase the color intensity and stability of the coating and prevent pigment sedimentation and aggregation. Wetting agents are mainly used to reduce the surface tension of coatings, making them easier to spread on the substrate surface. It should be emphasized that the specific materials of the resin matrix, solvent, defoamer, leveling agent, dispersant, and wetting agent, as well as their proportions in the coating, are not the main improvements of this application and are not limited here.

[0463] It should be noted that the nano-liquid glass in this application can be prepared using existing methods, which are not the main improvement points of this application and will not be elaborated here. Exemplarily, nano-liquid glass can be prepared by mixing a siloxane compound with a solvent to form a solution. The prepared solution is then heated to melt the siloxane compound and form a liquid state. While the siloxane compound is in a molten state, the solution is rapidly cooled to room temperature. After detection, analysis, separation, and purification, nano-liquid glass can be obtained. This step of rapidly cooling the solution to room temperature requires rapid cooling technology to prevent the nanoparticles from rearranging and forming an ordered structure, such as rapid solidification, rapid quenching, or rapid cooling.

[0464] For example, siloxane compounds include, but are not limited to, dimethylsilanol (DMSO), trimethylsilanol (TMSO), tetramethylsilanol (TMOS), etc.

[0465] In some embodiments of this application, the anti-glare particles include resin particles and glass particles; the glass particles are secondary particles formed by the aggregation of several nano-liquid glass particles. It should be noted that the aggregation of the nano-liquid glass in a liquid medium (such as the coating in this application) is the result of a combination of adsorption and repulsion. Exemplarily, the particles in the anti-glare layer are formed by the aggregation of multiple nano-liquid glasses through high-temperature sintering. Compared to the linear structure of particles in existing anti-glare layers, the particles in the anti-glare layer of this application exhibit a three-dimensional effect, and the particles are coarser and denser. When light passes through the AG layer, the light is dispersed to a greater extent, resulting in a stronger diffuse reflection effect and superior anti-glare performance.

[0466] In some embodiments of this application, the nanocrystalline liquid glass exhibits a three-dimensional cage-like structure, which can be formed during the rapid cooling process of glass solidification. It is understood that in liquid glass, the movement between molecules is very rapid, leaving insufficient time for orderly arrangement to form a long-range periodic structure. When the liquid glass cools rapidly, molecules become trapped in their original positions, forming a disordered, amorphous structure. Within this disordered structure, some molecular clusters can form cage-like structures, with some molecules enclosed within these cages. This cage-like structure results from the interactions and repulsion between molecules. These interactions can include van der Waals forces, hydrogen bonds, and charge interactions. These interactions cause some molecules to aggregate in space, forming a three-dimensional cage-like structure.

[0467] In some embodiments of this application, the molecular structure of the nano-liquid glass with a three-dimensional cage structure is shown in the following formula (1):

[0468]

[0469] In this context, R represents an organic group, such as methyl or phenyl; X represents various functional groups. Its basic structural unit is the silicon-oxygen tetrahedron (SiO4). Siloxanes possess excellent thermal stability, chemical stability, low surface tension, and superior dielectric properties. In practical applications, common organosilicon materials such as silicone oil, silicone rubber, and silicone resin are all based on the siloxane structure and are widely used in lubricants, sealants, coatings, electronic packaging materials, and many other fields.

[0470] It should be noted that this application innovatively incorporates nano-liquid glass with a structure of formula (1) into the coating. During the sintering process at 200°C to 250°C, multiple nano-liquid glasses in the coating can aggregate to form larger particles, and the particles exhibit a three-dimensional effect. This results in a three-dimensional effect within the particles of the prepared anti-glare layer, with coarser particles, higher density, and improved production efficiency. When light passes through the anti-glare glass with this anti-glare layer, the light is more dispersed, resulting in a stronger diffuse reflection effect and superior anti-glare performance.

[0471] For example, a coating containing nano-liquid glass is prepared according to a preset ratio, and then the coating is sprayed onto a glass substrate under pressure using a nozzle process. The glass substrate with the coating layer is then baked at 200°C to 250°C for a certain period of time to harden the coating layer and form the aforementioned anti-glare layer. For example, the baking time is 10 min to 60 min.

[0472] In some embodiments of this application, the anti-glare layer is formed using a spray coating process. Exemplarily, the coating described above can be sprayed onto a glass substrate to form an anti-glare coating layer, and then the anti-glare coating layer on the glass substrate is heated and dried to obtain the anti-glare layer. Exemplarily, a silica sol liquid is formed by fusing nanoscale liquid glass with resin, and then adding ethanol, dispersants, defoamers, etc., to form a liquid suitable for spray coating. The liquid is then sprayed onto the glass surface under pressure through a nozzle to form mist-like droplets. During spraying, the nanoscale liquid glass agglomerates into micron-sized particles, adhering to the glass surface and giving it a misty appearance. When light shines on the coating surface, the particles disperse the light, blurring the edges and making it difficult to form a clear reflection, thereby achieving the anti-glare effect. Specific Implementation

[0474] The following examples and comparative examples illustrate some embodiments of the implementation of this application. Various tests and evaluations were performed according to the methods described below. Furthermore, unless otherwise specified, "parts" and "%" are quality standards.

[0475] Test methods and equipment

[0476] Measurement of parameters for large-size anti-glare particles:

[0477] Use a 1000x magnifying glass (Keyence, VHX-X1 series, Japan) to observe any unit area (a rectangular area with a length and width of 0.1mm) of the anti-glare layer of the anti-glare glass under test.

[0478] Ten unit areas were randomly selected as test samples, and the maximum value of the straight line between any two points on the projected contour of a single anti-glare particle on the anti-glare layer in each unit area was measured. This value was taken as the diameter of the corresponding anti-glare particle. When the diameter of the anti-glare particle was between 5μm and 100μm, it was designated as a large-size anti-glare particle. Then, the percentage of the projected area of ​​the large-size anti-glare particle in each unit area was calculated to represent the total area of ​​the corresponding unit area. The arithmetic mean of these projected area percentages was recorded as the percentage of the projected area of ​​the large-size anti-glare particles contained in the unit area of ​​the anti-glare layer to the total area of ​​the unit area.

[0479] Ra test:

[0480] Five profile curves were randomly selected on the anti-glare layer of the anti-glare glass to be tested. The Ra values ​​of the five profile curves were tested using a surface roughness measuring instrument (Mitutoyo SJ-210, Japan). The average Ra value of the five curves was then calculated, which is the average roughness Ra of the anti-glare layer in the anti-glare glass.

[0481] Visibility test:

[0482] The interactive display devices of each embodiment or comparative example were tested. First, both surfaces of the sample were cleaned until visually free of dirt, fingerprints, dust, and scratches. Test conditions were controlled as follows: ambient temperature 23℃±2℃, relative humidity 50%±5%. After calibrating a RHOPOINT multi-function gloss meter (model: IQ206085), tests were conducted at the four corners of the anti-glare glass of the interactive display device (20cm from the edge) and at the center. DOI data were recorded at five points, and the average value was calculated as the result. A higher DOI value indicates a clearer reflected image and better decorative performance of the anti-glare glass.

[0483] Haze test:

[0484] The experimental apparatus mainly consists of a standard C-light source, a condenser lens, a sample holder, an integrating sphere, a standard white board, a trap, a photocell, and a galvanometer. The samples used are anti-glare glass from the various embodiments or comparative examples, and the tests were conducted using a Shanghai Shenguang WGT-S / haze meter. When a beam of light shines on an object, part of the light is reflected by the surface, part is absorbed by the object's interior, and part passes through the object. The proportion of these three parts depends on the surface and internal properties of the object. For transparent glass samples, most of the incident light passes through, but the transmitted light is divided into direct and scattered parts. The ratio of these parts is related to the internal properties of the sample material. The higher the proportion of direct light, the better the transparency of the material; the higher the proportion of scattered light, the more pronounced the turbidity of the material, i.e., the greater the haze.

[0485] Example 1

[0486] <Preparation of Anti-Glare Glass>

[0487] An anti-glare coating containing nano-liquid glass was sprayed onto one surface of a glass substrate using a spraying machine. The spraying pressure was 7 MPa, the flow rate was 160 g / min, and the conveyor belt speed was 650 mm / min.

[0488] After spraying, the coating is baked until it forms anti-glare particles, thus producing anti-glare glass. The baking temperature is 210℃ and the baking time is 30 minutes.

[0489] <Preparation of Interactive Display Devices>

[0490] The anti-glare glass and display panel are bonded together using frame adhesive (fitted around the edges with an air gap in the center). The assembly formed by the anti-glare glass and display panel is then fixed to the frame using clamps, and finally combined with the back panel to obtain the interactive display device. The display panel is 65 inches in size, with a resolution of 3840×2160 and a pixel density of 67.8 PPI.

[0491] Examples 1-2 to 1-11, Comparative Examples 1-1 to 1-2

[0492] Compared to Examples 1-1, the difference lies in the following: the pixel density Pd of the display panel, the anti-glare layer Ra of the interactive display device, the sharpness, light transmittance, and haze were adjusted according to Table 3. Specific adjustments and performance test results are shown in Table 3. Specifically, the average roughness Ra of the anti-glare layer was increased by increasing the spray flow rate; the proportion of large-size anti-glare particles in the anti-glare coating was increased by controlling the particle diameter of the nano-liquid glass, thereby regulating the area proportion of large-size anti-glare particles in the anti-glare layer. The display panel size in Examples 1-5 is 86 inches, the display panel size in Examples 1-6 is 110 inches, and the display panel size in Examples 1-7 is 55 inches, all with a resolution of 3840×2160.

[0493] The above experimental examples were subjected to relevant tests, and the test results are shown in Table 3. Table 3

[0494] As shown in Table 3, in the interactive display device of this application, the pixel density of the display panel is Pd, with 40.1 PPI ≤ Pd ≤ 80.1 PPI; the DOI of the anti-glare glass is 20 to 40; the haze of the anti-glare glass is 10% to 20%; the light transmittance of the anti-glare glass is greater than 88%; and the Ra of the anti-glare layer is 0.3 μm to 0.5 μm. By matching the pixel density of the display panel with the roughness Ra of the anti-glare layer, and simultaneously adjusting the haze and light transmittance of the anti-glare glass to meet the above ranges, the anti-glare function is guaranteed while good light transmittance is taken into account, so that the image maintains good visibility at a wide viewing angle, thereby improving the overall anti-glare effect and display effect of the interactive display device. In particular, when at least one of the following is satisfied: the DOI of the anti-glare glass is 27 to 38, the haze of the anti-glare glass is 13% to 18%, the light transmittance of the anti-glare glass is 89% to 93%, and the Ra of the anti-glare layer is 0.35 μm to 0.4 μm, it is beneficial to further improve the anti-glare effect and display effect of the interactive display device.

[0495] In particular, when the area ratio of large-sized anti-glare particles with a diameter D satisfying 5μm≤D≤100μm in the anti-glare layer is 80% to 100%, the light scattering effect can be further improved, thereby improving the anti-glare and display effects of the interactive display device. Especially, when the area ratio of large-sized anti-glare particles in the anti-glare layer is 85% to 100%, it is beneficial to further improve both the anti-glare and display effects of the interactive display device. Specifically, when the area ratio of the first anti-glare particle with a diameter D satisfying 5μm≤D≤60μm to the second anti-glare particle with a diameter D satisfying 60μm<D≤100μm is 1:(0.4~0.7), the light scattering effect can be more precisely controlled, further improving the anti-glare and display effects of the interactive display device.

[0496] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0497] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An optical composite film, wherein, include: A dimming film layer includes a first substrate layer and a UV adhesive structure. The UV adhesive structure is pressed onto the surface of the first substrate layer, and multiple dimming structures are formed on the UV adhesive structure. The multiple dimming structures are arranged side by side and spaced apart on the first substrate layer. The cross-section of each dimming structure is a polygonal structure, and the angle of each dimming structure is 33° to 63°. The angle is the included angle formed by the two surfaces of the dimming structure along the width direction. A protective adhesive layer is applied to the UV adhesive structure, and the refractive index of the protective adhesive layer is less than the refractive index of the UV adhesive structure.

2. The optical composite film according to claim 1, wherein, The dimming structure has a trapezoidal cross-section, with a height H of 5μm to 200μm, a bottom edge S of 1μm to 150μm, a top edge S1 of 0.2μm to 100μm, and a spacing L of 0μm to 200μm between two adjacent dimming structures. Alternatively, the dimming structure has a trapezoidal cross-section and a convex or concave arc surface. The height H of the dimming structure is 5μm to 200μm, the bottom edge S is 1μm to 150μm, the distance L between two adjacent dimming structures is 0μm to 200μm, and the radius a of the convex arc surface or the radius b of the concave arc surface is 0.2μm to 100μm. Alternatively, the cross-section of the dimming structure is a composite structure of trapezoids superimposed with triangles, the total height H of the dimming structure is 2μm to 150μm, the height H1 of the trapezoidal structure is 2μm to 150μm, the first angle R1 is smaller than the second angle R2, the base S is 1μm to 150μm, and the distance L between two adjacent dimming structures is 0μm to 200μm.

3. The optical composite film according to claim 1, wherein, The dimming film layer further includes a first diffusion structure, which is disposed on the side of the first substrate layer opposite to the dimming structure.

4. The optical composite film according to claim 3, wherein, The first diffusion structure is made by mixing a first optical adhesive and diffusion particles; wherein the weight ratio of the first optical adhesive to the diffusion particles is 100:(4-20).

5. The optical composite film according to claim 1, wherein, The dimming structure is a first microprism, and the connection between the first microprism and the first substrate layer is connected and transitioned by rounded corners or chamfers.

6. The optical composite film according to claim 5, wherein, At least two of the first microprisms are of equal height; Alternatively, at least two adjacent first microprisms have different heights, and the height of the shorter of the two adjacent first microprisms is set as H2, and the height of the taller of the two adjacent first microprisms is set as H1, where H2 = (20% to 80%)H1.

7. The optical composite film according to claim 5, wherein, The first microprism contains a second optical adhesive, the refractive index of which is greater than that of the protective adhesive layer.

8. The optical composite film according to claim 3, wherein, The first diffusion structure includes diffusion particles, which are composed of one or a mixture of at least two of PMMA particles, PBMA particles, SiO2 particles, and organosilicon sphere particles. The PMMA particles have a particle size of 1 μm to 100 μm; the PBMA particles have a particle size of 1 μm to 100 μm; the SiO2 particles have a particle size of 1 μm to 100 μm; and the organosilicon spheres have a particle size of 1 μm to 100 μm.

9. The optical composite film according to claim 1, wherein, The first substrate layer is made of any one of polycarbonate, polyethylene terephthalate, polystyrene, polyethylene, and polymethyl methacrylate, and the thickness of the first substrate layer is 30 μm to 300 μm.

10. The optical composite film according to claim 1, wherein, The optical composite film further includes: A base film layer, wherein the dimming film layer is disposed on one side of the base film layer, and the dimming structure is opposite to the base film layer and is oriented toward the light source; and A prism film layer is disposed on the side of the base film layer away from the dimming film layer.

11. The optical composite film according to claim 10, wherein, The base film layer includes a substrate, a first adhesive layer, and a second adhesive layer. The first adhesive layer and the second adhesive layer are respectively disposed on opposite sides of the substrate. The first adhesive layer is bonded and fixed to the protective adhesive layer, and the second adhesive layer is bonded and fixed to the prism film layer.

12. The optical composite film according to claim 10, wherein, The optical composite film further includes a diffusion layer, which is disposed on the side of the prism film layer away from the base film layer.

13. The optical composite film according to claim 12, wherein, The diffusion layer is a diffusion film or a diffusion sheet; When the diffusion layer is a diffusion film, the diffusion film has a third microprism disposed toward the prism film layer and a second diffusion structure disposed away from the prism film layer.

14. The optical composite film according to claim 13, wherein, The height of the third microprism is 30μm to 70μm, and the angle is 85° to 105°.

15. A backlight module, wherein, Including the optical composite film as described in any one of claims 1 to 14.

16. An interactive display device, wherein, include: Glass cover, display panel, light-emitting element, and optical composite film as described in any one of claims 1 to 14; The glass cover is stacked on top of the light-emitting side of the display panel, and the glass cover has a concave surface facing inward toward the display panel; the glass cover is anti-glare glass, and its surface is provided with an anti-glare layer. The optical composite film is disposed on the light-incident side of the display panel, and the light-emitting element is located on the light-incident side of the optical composite film; The interactive display device can be configured in various ways, including but not limited to: having multiple light-emitting elements arranged in a matrix. Alternatively, the number of light-emitting elements may be multiple, and the interactive display device may also include a reflective sheet and a light guide plate. Multiple light-emitting elements are disposed on the outer periphery of the light guide plate, the reflective sheet is stacked on the side of the optical composite film near the display panel, and the light guide plate is stacked between the reflective sheet and the optical composite film.

17. The interactive display device according to claim 16, wherein, The pixel density of the display panel is Pd, where 40.1 PPI ≤ Pd ≤ 80.1 PPI; The average roughness of the anti-glare layer is Ra, 0.1μm≤Ra≤1μm; The sharpness of the anti-glare glass is 50-85; The anti-glare glass has a haze of 2% to 15%.

18. The interactive display device according to claim 17, wherein, 0.1μm≤Ra≤0.3μm.

19. The interactive display device according to claim 18, wherein, 51.2 PPI ≤ Pd ≤ 67.8 PPI.

20. The interactive display device according to claim 17, wherein, The anti-glare glass meets at least one of the following conditions: (1) The sharpness of the anti-glare glass is 60-80; (2) The haze of the anti-glare glass is 3% to 8%.

21. The interactive display device according to any one of claims 17 to 20, wherein, The anti-glare layer includes anti-glare particles; when the diameter of the anti-glare particles is 3μm to 80μm, the anti-glare particles are large-sized anti-glare particles.

22. The interactive display device according to claim 21, wherein, The projected area of ​​the large-sized anti-glare particles contained in a unit area of ​​the anti-glare layer accounts for 80% to 100% of the total area of ​​the unit area, and the unit area is a rectangular area of ​​0.1mm × 0.1mm.

23. The interactive display device according to claim 22, wherein, The projected area of ​​the large-sized anti-glare particles contained in a unit area of ​​the anti-glare layer accounts for 85% to 100% of the total area of ​​the unit area.

24. The interactive display device according to claim 16, wherein, The pixel density of the display panel is Pd, where 40.1 PPI ≤ Pd ≤ 80.1 PPI; The DOI of the anti-glare glass is 20 to 40; The haze of the anti-glare glass is 10% to 20%; The light transmittance of the anti-glare glass is greater than 88%; The Ra of the anti-glare layer is 0.3 μm to 0.5 μm.

25. The interactive display device according to claim 24, wherein, The anti-glare glass meets at least one of the following conditions: Condition I: The DOI of the anti-glare glass is 27 to 38; Condition II: The haze of the anti-glare glass is 13% to 18%; Condition III: The light transmittance of the anti-glare glass is 89% to 93%; Condition IV: The Ra of the anti-glare layer is 0.35 μm to 0.4 μm.

26. The interactive display device according to claim 21, wherein, The pixel density of the display panel is Pd, where 51.2 PPI ≤ Pd ≤ 67.8 PPI.

27. The interactive display device according to any one of claims 24 to 26, wherein, The anti-glare layer includes anti-glare particles with a diameter of D. When 5μm≤D≤100μm, the anti-glare particles are large-sized anti-glare particles. Based on the total area of ​​the anti-glare layer, the area ratio of the large-sized anti-glare particles is 80% to 100%.

28. The interactive display device according to claim 27, wherein, Based on the total area of ​​the anti-glare layer, the area ratio of the large-sized anti-glare particles is 85% to 100%.

29. The interactive display device according to claim 27, wherein, The large-size anti-glare particles include a first anti-glare particle and a second anti-glare particle. When 5μm≤D≤60μm, the anti-glare particle is the first anti-glare particle, and when 60μm<D≤100μm, the anti-glare particle is the second anti-glare particle. The area ratio of the first anti-glare particle to the second anti-glare particle is 1:(0.4~0.7).

30. The interactive display device according to claim 27, wherein, The thickness of the anti-glare layer is 2μm to 6μm.

31. The interactive display device according to claim 27, wherein, The average diameter of the large-sized anti-glare particles is 15μm to 50μm.

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