Scattering film, display module and display device

Abstract

Disclosed are a scattering film, a display module and a display device. The scattering film comprises: a scattering particle layer arranged on a bearing layer, the scattering particle layer comprises a plurality of scattering particles, and the surface of the scattering particle layer away from the bearing layer is a concave-convex surface; wherein, in the scattering particle layer, more than 90% of the scattering particles have a particle size within the range of [5 μm, 30 μm].

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a scattering film, a display module and a display device. Background Art

[0002] With the development of display technology, large-size display screens are increasingly used in teaching, conferences, etc. During teaching and conferences, users often use laser pens to mark the content displayed on the display screen. Summary of the invention

[0003] The present disclosure provides a scattering film, a display module and a display device.

[0004] In a first aspect, the present disclosure provides a scattering film, comprising:

[0005] A scattering particle layer is disposed on the carrier layer, the scattering particle layer comprises a plurality of scattering particles, and a surface of the scattering particle layer away from the carrier layer is a concave-convex surface;

[0006] Wherein, in the scattering particle layer, more than 90% of the scattering particles have a particle size within the range of [5 μm, 30 μm].

[0007] In some embodiments, the average particle size of all scattering particles in the scattering particle layer is in the range of (10 μm, 25 μm].

[0008] In some embodiments, the average particle size of all scattering particles in the scattering particle layer is in the range of [14 μm, 25 μm].

[0009] In some embodiments, all scattering particles in the scattering particle layer have at least two different particle sizes.

[0010] In some embodiments, the material of the scattering particles includes an inorganic non-metallic material or a metal oxide material.

[0011] In some embodiments, the scattering film further includes: a first protective layer, the first protective layer is disposed on a surface of the scattering particle layer away from the supporting layer, and a surface of the first protective layer away from the scattering particle layer is a concave-convex surface.

[0012] In some embodiments, in at least a portion of the scattering particle layer, a surface of the first protective layer facing away from the supporting layer is conformal to a surface of the scattering particle layer facing away from the supporting layer.

[0013] In some embodiments, the hardness of the first protection layer is greater than the hardness of the scattering particles.

[0014] In some embodiments, the material of the first protective layer includes an inorganic non-metallic material or a metal oxide material.

[0015] In some embodiments, the scattering particle layer further includes a dielectric material layer, and the scattering particles are fixed on the surface of the supporting layer through the dielectric material layer.

[0016] In a second aspect, an embodiment of the present disclosure further provides a display module, comprising: a display panel and a scattering film arranged on the light-emitting side of the display panel, wherein the scattering film is the scattering film mentioned above, wherein the display panel comprises a bearing layer for bearing the scattering film, and the bearing layer comprises a light-transmitting material.

[0017] In some embodiments, the carrier layer includes: a polarization layer, and the polarization layer is used to change the polarization state of the light passing through the polarization layer.

[0018] In some embodiments, the polarizing layer includes a stacked polarizing layer body and a second protective layer, and the scattering film is located on a side of the second protective layer away from the polarizing layer body and in direct contact with the second protective layer.

[0019] In some embodiments, the carrier layer further comprises:

[0020] A transparent substrate layer, wherein the scattering film is arranged on a surface of the transparent substrate layer away from the polarizing layer;

[0021] An optical adhesive layer is bonded between the transparent substrate layer and the polarizing layer.

[0022] In some embodiments, the display panel is a liquid crystal display panel, and the liquid crystal display panel includes: a liquid crystal layer, a glass substrate located between the liquid crystal layer and the scattering film,

[0023] The scattering film further comprises: a first protective layer and a dielectric material layer, wherein the first protective layer is arranged on the surface of the scattering particle layer away from the bearing layer, and the scattering particles are fixed on the surface of the bearing layer through the dielectric material layer;

[0024] Wherein, the refractive index of at least one of the scattering particles, the first protective layer and the dielectric material layer is less than or equal to the refractive index of the glass substrate.

[0025] In some embodiments, the display panel is a self-luminous display panel, and the self-luminous display substrate includes: a light-emitting unit and at least one film layer arranged between the light-emitting unit and the scattering film,

[0026] The scattering film further comprises: a first protective layer and a dielectric material layer, wherein the first protective layer is arranged on the surface of the scattering particle layer away from the bearing layer, and the scattering particles are fixed on the surface of the bearing layer through the dielectric material layer;

[0027] The refractive index of at least one of the scattering particles, the first protective layer and the dielectric material layer is less than or equal to the refractive index of the film layer with the largest refractive index between the light-emitting unit and the scattering film.

[0028] In a third aspect, an embodiment of the present disclosure provides a display device, which includes the above-mentioned display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0030] Figure 1 is a schematic diagram of a display device in an example.

[0031] Figure 2 It is a schematic diagram of a scattering film provided in some embodiments of the present disclosure.

[0032] Figure 3 Schematic diagram of a scattering film provided in some other embodiments of the present disclosure.

[0033] Figure 4 A schematic diagram of a display module provided in some embodiments of the present disclosure.

[0034] Figure 5 Schematic diagram of a display module provided in some other embodiments of the present disclosure.

[0035] Fig. 6A Schematic diagram of the scattering effect of laser on a display device without a scattering film.

[0036] Figure 6B for Figure 4 Schematic diagram of the scattering effect of the display module on laser.

[0037] Figure 6C for Figure 5 Schematic diagram of the scattering effect of the display module on laser. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0039] The terms used to describe the embodiments of the present disclosure herein are not intended to limit and / or define the scope of the present disclosure. For example, unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. It should be understood that the "first", "second" and similar words used in the present disclosure do not represent any order, quantity or importance, but are only used to distinguish different components. Unless the context clearly indicates otherwise, the singular form "one", "one" or "the" and other similar words do not represent quantity restrictions, but represent the existence of at least one. "Including" or "including" and other similar words mean that the elements or objects appearing in front of "including" or "including" cover the elements or objects listed after "including" or "including" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] In teaching, conference and other occasions, some large-size display devices (for example, integrated tablet computers) can replace projectors, electronic whiteboards and other equipment, bringing more convenience to teaching and conferences. Figure 1 is a schematic diagram of a display device in an example, Figure 1 As shown, the display device includes: an array substrate 10, a pairing substrate 20, a liquid crystal layer 30, a first polarizer 11, a second polarizer 21 and a backlight source (not shown), the array substrate 10 and the pairing substrate 20 are arranged opposite to each other, the liquid crystal layer 30 is arranged between the array substrate 10 and the pairing substrate 20, the first polarizer 11 is located on the side of the array substrate 10 away from the pairing substrate 20, and the second polarizer 21 is located on the side of the pairing substrate 20 away from the array substrate 10, for example, the transmission directions of the first polarizer 11 and the second polarizer 21 are perpendicular to each other. The display principle of the display device is: the natural light of the backlight source forms linear polarized light after passing through the first polarizer 11; the liquid crystal molecules of the liquid crystal layer 30 are deflected under the action of the electric field, thereby adjusting the polarization direction of the linear polarized light passing through the liquid crystal layer 30, and then adjusting the transmittance of the linear polarized light passing through the second polarizer 21 to display the corresponding gray scale.

[0041] When using a display device, a user can use a laser pen to emit laser light to the screen of the display device, so as to explain the content displayed by the display device more conveniently. However, the polarizer in the current display device has a poor scattering effect on laser light, resulting in that when the laser pen emits laser light toward the screen, the laser pen spot can only be seen at certain specific angles, and the spot is almost invisible at other angles, thus affecting the user experience.

[0042] Figure 2FIG. 1 is a schematic diagram of a scattering film provided in some embodiments of the present disclosure, wherein the scattering film is used in a display device. Figure 2 As shown, the scattering film 4 includes: a scattering particle layer 42 disposed on a carrier layer 41. The carrier layer 41 is used to allow at least a portion of the light irradiated to the carrier layer 41 to pass through. The scattering particle layer 42 includes a plurality of scattering particles 421, and the surface of the scattering particle layer 42 away from the carrier layer 41 is a concave-convex surface. In the scattering particle layer 42, more than 90% of the scattering particles 421 have a particle size within the range of [5μm, 30μm]. Optionally, the average particle size of the plurality of scattering particles 421 in the scattering particle layer 42 is above 10μm. Among them, the scattering particles 421 can be spherical or quasi-spherical, and the particle size of the scattering particles 421 is the diameter.

[0043] In the embodiment of the present disclosure, the scattering film 4 includes a scattering particle layer 42, and the surface of the scattering particle layer 42 away from the carrier layer 41 is a concave-convex surface. In this way, when the scattering film 4 is arranged on the light-emitting side of the display panel, and the scattering particle layer 42 is located on the side of the carrier layer 41 away from the display panel, the scattering particle layer 42 can play a good scattering effect on the laser, so that the user can see the laser spot at multiple different angles, thereby improving the user experience. In addition, the inventor found that when the particle size of the scattering particle 421 is too large, the display quality of the display panel will be affected after the scattering film 4 is arranged on the light-emitting side of the display panel, for example, the color of the picture will be whitish; and the thickness of the scattering film 4 will be large; and when the particle size of the scattering particle 421 is too small, the scattering effect of the scattering film 4 is weak. In the present disclosure, the particle size of more than 90% of the scattering particles 421 is within the range of [5μm, 30μm], which can improve the scattering effect of the scattering film 4 and reduce the thickness of the scattering film 4 while ensuring the quality of the display picture.

[0044] Preferably, more than 90% of the scattering particles in the scattering particle layer have a particle size within the range of [10 μm, 25 μm], thereby further improving the scattering effect of the scattering film 4 while ensuring the quality of the display image.

[0045] In some embodiments, the average particle size d of all scattering particles 421 in the scattering particle layer 42 may be greater than 10 μm, for example, 10 μm < d ≤ 12 μm; for example, 12 μm < d ≤ 15 μm; for example, 15 μm < d ≤ 30 μm; for example, 20 μm < d ≤ 30 μm; for example, 10.5 μm < d ≤ 25 μm. In a preferred embodiment of the present disclosure, 14 μm ≤ d ≤ 25 μm, thereby ensuring the image quality of the display screen while maximizing the scattering effect of the scattering film 4. In another preferred embodiment, 16 μm ≤ d ≤ 17 μm, thereby ensuring the image quality of the display screen while further improving the scattering effect of the scattering film 4.

[0046] In some embodiments, the plurality of scattering particles 421 in the scattering particle layer 42 have at least two different particle sizes, thereby increasing the roughness of the surface of the scattering particle layer 42. For example, the plurality of scattering particles 421 in the scattering particle layer 42 have 3 to 5 different particle sizes; for another example, the plurality of scattering particles 421 in the scattering particle layer 42 have 5 to 10 different particle sizes. The number of scattering particles 421 of each particle size is similar. In addition, the scattering particles 421 of different particle sizes are uniformly distributed on the carrier layer 41. The "uniform distribution" here means that after the area where the scattering particle layer 42 is located is divided into a plurality of unit areas, the number of scattering particles 421 in each unit area is roughly the same; and in each unit area, scattering particles 421 of various particle sizes are distributed.

[0047] In addition, the spacing between the multiple scattering particles 421 in the scattering particle layer 42 can be set to be smaller than the particle size of the smallest scattering particle 421, so that the multiple scattering particles 421 are distributed more densely, thereby increasing the roughness of the surface of the scattering particle layer 42 and improving the scattering effect of the scattering film 4.

[0048] In the embodiment of the present disclosure, the scattering particles 421 are made of a light-transmitting material, thereby ensuring that the light of the display panel can pass through the scattering particle layer 42. For example, the scattering particles 421 can be made of an inorganic or organic material. In some embodiments, the material of the scattering particles 421 can include: an inorganic non-metallic material or a metal oxide material, thereby improving the stability of the scattering particles 421 and preventing the scattering particles 421 from being damaged, thereby extending the service life of the scattering film 4. Exemplarily, the material of the scattering particles 421 includes SiO2, Al2O3, TiO2 or ZrO2. Of course, the scattering particles 421 can also be made of other materials with higher hardness and inactive chemical properties.

[0049] In order to make the scattering particles 421 stably adhere to the surface of the carrier layer 41, Figure 2As shown, the scattering particle layer 42 further includes a dielectric material layer 422, and the scattering particles 421 are fixed on the surface of the carrier layer 41 through the dielectric material layer 422. When preparing the scattering particle layer 42, the scattering particles 421 and the dielectric material solution can be evenly mixed first, and then the dielectric material solution doped with the scattering particles 421 is coated on the surface of the carrier layer 41 and solidified, thereby obtaining the scattering particle layer 42. Among them, the thickness of the dielectric material layer 422 can be less than the average particle size of all the scattering particles 421 in the scattering particle layer 42, so as to ensure that the surface of the scattering particle layer 42 away from the carrier layer 41 is a concave-convex surface with a certain roughness. In one example, the thickness of the dielectric material layer 422 is less than the particle size of the smallest scattering particle 421 in the scattering particle layer 42; in one example, the thickness of the dielectric material layer 422 is less than or equal to the radius of the smallest scattering particle 421 in the scattering particle layer 42; in one example, the thickness of the dielectric material layer 422 is less than or equal to one third of the average particle size of all scattering particles in the scattering particle layer 42; in one example, the thickness of the dielectric material layer 422 is less than or equal to one half of the average particle size of all scattering particles in the scattering particle layer 42. The designs in the above examples can enable the surface of the scattering particle layer 42 away from the carrier layer 41 to achieve a higher roughness.

[0050] The dielectric material layer 422 may be made of an organic material. Specifically, the dielectric material layer 422 may be formed by curing an organic colloid, such as an acrylic resin.

[0051] Figure 3 is a schematic diagram of a scattering film 4 provided in some other embodiments of the present disclosure, Figure 3 The diffuser film 4 shown is Figure 2 Similar, except that Figure 3 In the embodiment, the scattering film 4 may further include: a first protective layer 43, which is arranged on the surface of the scattering particle layer 42 away from the supporting layer 41, wherein the surface of the first protective layer 43 away from the scattering particle layer 42 is a concave-convex surface to ensure the scattering effect of the scattering film 4.

[0052] In some embodiments, in at least a portion of the scattering particle layer 42, the surface of the first protective layer 43 away from the carrier layer 41 is conformal to the surface of the scattering particle layer 42 away from the carrier layer 41. It should be noted that "conformal" means that the shapes of the two surfaces are the same or substantially the same. For example, the surface of the scattering particle layer 42 away from the carrier layer 41 includes a plurality of curved surfaces, and the surface of the first protective layer 43 away from the carrier layer 41 also includes a plurality of curved surfaces, and the curvature of the plurality of curved surfaces of the first protective layer 43 is equal to or approximately equal to the curvature of the corresponding positions of the plurality of curved surfaces of the scattering particle layer 42. For example, the curvature of the highest point of each scattering particle 421 is the same as the curvature of the corresponding position of the first protective layer 43. Among them, the highest point of the scattering particle 421 is the point farthest from the carrier layer 41. The first protective layer 43 is used to protect the scattering particle layer 42 to prevent the scattering particles 421 from being worn by the outside. In order to improve the protective effect of the first protective layer 43 on the scattering particles 421, in some embodiments, the hardness of the first protective layer 42 can be greater than the hardness of the scattering particles 421.

[0053] The material of the first protective layer 43 may be an inorganic non-metal material or a metal oxide material. For example, the material of the first protective layer 43 may be SiO2, Al2O3, TiO2 or ZrO2.

[0054] Figure 4 is a schematic diagram of a display module provided in some embodiments of the present disclosure, Figure 5 Schematic diagram of a display module provided in some other embodiments of the present disclosure, such as Figure 4 and Figure 5 As shown, the display module includes: a display panel and the scattering film 4 in the above embodiment, wherein the display panel includes a bearing layer 41 for bearing the scattering film 4, the scattering film 4 is arranged on the light emitting side of the display panel, and the scattering particle layer 42 in the scattering film 4 is located on the side of the bearing layer 41 away from the display panel.

[0055] In some embodiments, the display panel is a liquid crystal display panel, which includes a liquid crystal cell and a carrier layer 41 located on one side of the liquid crystal cell. Figure 4 and Figure 5 As shown, the liquid crystal box includes an array substrate 10 and a matching box substrate 20 that are relatively arranged, and a liquid crystal layer 30 located between the array substrate 10 and the matching box substrate 20. The liquid crystal display panel also includes a first polarizer 11, and the first polarizer 11 is arranged on the side of the array substrate 10 away from the matching box substrate 20. The supporting layer 41 is located on the side of the matching box substrate 20 away from the array substrate 10.

[0056] In one example, if Figure 4 and Figure 5As shown, the carrier layer 41 may include a polarization layer 41a, wherein the polarization layer 41a is used to change the polarization state of the light passing through the polarization layer 41a; for example, the circularly polarized light passing through the polarization layer 41a is converted into linearly polarized light. Figure 5 As shown, the polarizing layer 41a includes a polarizing layer body 411, a second protective layer 412 and a third protective layer 413. It should be noted that the polarizing layer 41a may include both the second protective layer 412 and the third protective layer 413, or may include the second protective layer 412 but not the third protective layer 413.

[0057] The material of the polarizing layer body 411 may include polyvinyl alcohol (PVA); the material of the second protective layer 412 and the material of the third protective layer 413 may include any one of triacetyl cellulose (TAC), polymethyl methacrylate (PMMA), thermoplastic polyurethane (TPU), polyimide (PI), and polyethylene terephthalate (PET). For example, the material of the second protective layer 412 and the material of the third protective layer 413 are both made of triacetyl cellulose. Polyvinyl alcohol is a high molecular polymer that is dyed with various organic dyes with dichroic properties and stretched under certain humidity and temperature conditions to absorb the dichroic dyes to form polarization properties. The triacetyl cellulose film layer has high strength, high light transmittance, and is resistant to moisture and heat, and can well protect the polyvinyl alcohol film layer.

[0058] In addition, if Figure 5 As shown, the polarizing layer 41a may further include: an adhesive layer 414, which is disposed on a side of the third protective layer 413 away from the polarizing layer body 411, and the adhesive layer 414 is used to bond the polarizing layer 41a to the liquid crystal box. Before the display module is assembled (for example, before bonding the polarizing layer 41a to the liquid crystal box), a release film may be attached to the surface of the adhesive layer 414 away from the polarizing layer 41a, and the release film is used to prevent dust and other impurities from adhering to the adhesive layer 414 and causing the viscosity to decrease; when the display module is assembled, the release film is peeled off and the polarizing layer 41a is bonded to the liquid crystal box.

[0059] In one example, if Figure 5 As shown, the diffusion film 4 may be in direct contact with the polarization layer 41 a . For example, the diffusion film 4 is directly formed on the second protection layer 412 .

[0060] In another example, Figure 4 As shown, the carrier layer 41 may include, in addition to the polarizing layer 41a, a transparent substrate layer 41c and an optical adhesive layer 41b, and the scattering film 4 is disposed on the surface of the transparent substrate layer 41c away from the polarizing layer 41a. The optical adhesive layer 41b is bonded between the transparent substrate layer 41c and the polarizing layer 41a.

[0061] The structure of the polarization layer 41a can be Figure 5 The structure of the polarizing layer 41a is the same.

[0062] The thickness of the optical adhesive layer 41b is between 0.15 mm and 0.4 mm, thereby ensuring that the optical adhesive layer 41b achieves a good bonding effect, while making the overall thickness of the display module smaller and preventing the occurrence of optical moiré caused by a thick optical film layer. For example, the thickness of the optical adhesive layer 41b is 0.25 mm.

[0063] The transparent substrate layer 41c is a transparent layer made of transparent material. It should be noted that the transparent layer may specifically refer to a film layer with a light transmittance greater than 70% and does not change the polarization state of light.

[0064] Optionally, the material of the transparent substrate layer 41c includes a resin material, for example, a resin material such as polyimide (PI), polycarbonate (PC), polyetherimide (PEI), polyethersulfone (PES), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN). The transparent substrate layer 41c may include a single layer or a stack of multiple layers. In one example, the transparent substrate layer 41c is a PET film layer.

[0065] In the production process of the display module, the scattering film 4 can be first formed on the transparent substrate layer 41c, and then the transparent substrate layer 41c is bonded to the polarizing layer 41c outside the liquid crystal cell by using the optical adhesive layer 41b. Optionally, the thickness of the transparent substrate layer 41c is between 150 μm and 200 μm to ensure that the transparent substrate layer 41c has good bearing stability and the overall thickness of the display module is small.

[0066] When the refractive index of the scattering film 4 is large, the light emitted from the display panel is easily gathered (that is, the angle between the angle of the light emitted by the display module as a whole and the thickness direction of the display panel is reduced), resulting in a reduction in the viewing angle of the display module. In order to prevent this phenomenon, when the display panel adopts a liquid crystal display panel, the refractive index of the scattering particles 421 is less than or equal to the refractive index of the glass substrate between the liquid crystal layer 30 and the scattering film 4. The glass substrate is the substrate of the cell substrate 20. As described above, in addition to the scattering particles 421, the scattering film 4 may also include a dielectric material layer 422. In this case, the refractive index of one of the dielectric material layer 422 and the scattering particles 421 is less than or equal to the refractive index of the glass substrate between the liquid crystal layer 30 and the scattering film 4. Of course, the scattering film 4 may include the scattering particles 421 and the first protective layer 423 at the same time, but not the dielectric material layer 422. In this case, the refractive index of at least one of the scattering particles 421 and the first protective layer 423 is less than or equal to the refractive index of the glass substrate between the liquid crystal layer 30 and the scattering film 4. Of course, the scattering film 4 may include scattering particles 421, a first protective layer 423 and a dielectric material layer 422 at the same time. In this case, the refractive index of at least one of the scattering particles 421, the dielectric material layer 422 and the first protective layer 423 is less than or equal to the refractive index of the glass substrate between the liquid crystal layer 30 and the scattering film 4. For example, the refractive indexes of the scattering particles 421, the dielectric material layer 422 and the first protective layer 423 are all less than or equal to the refractive index of the glass substrate.

[0067] Of course, the display panel can also be a self-luminous display panel, which includes a light-emitting unit and at least one film layer between the light-emitting unit and the scattering film 4. Among them, the self-luminous display panel can be a miniLED / MicroLED (micro light-emitting diode) display panel, or an OLED (organic electroluminescent diode) display panel, or a QLED (quantum dot light-emitting diode) display panel. For the miniLED / MicroLED display panel, the light-emitting unit is the cathode and the anode, and the structure between the two for emitting light; for the miniLED\MicroLED display panel, the light-emitting unit is an LED chip. Among them, the film layer between the light-emitting unit and the scattering film 4 includes, for example, an encapsulation layer, a protective layer, a cover plate, etc.

[0068] Similar to the liquid crystal display panel, when the display panel is a self-luminous display panel, in order to prevent the light emitted by the display panel from being easily gathered, the refractive index of the scattering particles 421 can be made less than or equal to the refractive index of the film layer with the largest refractive index between the light-emitting unit and the scattering film 4. Alternatively, when the scattering film 4 includes the scattering particles 421 and the dielectric material layer 422, the refractive index of at least one of the scattering particles 421 and the dielectric material layer 422 is less than or equal to the refractive index of the film layer with the largest refractive index between the light-emitting unit and the scattering film 4. When the scattering film 4 includes the scattering particles 421 and the first protective layer 423, the refractive index of at least one of the scattering particles 421 and the first protective layer 423 is less than or equal to the refractive index of the film layer with the largest refractive index between the light-emitting unit and the scattering film 4. When the scattering film 4 includes the scattering particles 421, the dielectric material layer 422 and the first protective layer 423 at the same time, the refractive index of at least one of the scattering particles 421, the dielectric material layer 422 and the first protective layer 423 is less than or equal to the refractive index of the film layer with the largest refractive index between the light-emitting unit and the scattering film 4. For example, the refractive indexes of the scattering particles 421 , the dielectric material layer 422 , and the first protective layer 423 are all less than or equal to the refractive index of the film layer with the largest refractive index between the light emitting unit and the scattering film 4 .

[0069] The embodiment of the present disclosure also provides a display device, which includes the display module described in the above embodiment. The display device is particularly suitable for large-size display devices, such as an integrated conference tablet computer.

[0070] In the embodiment of the present disclosure, a scattering film 4 is provided on the light-emitting side of the display panel. The scattering film 4 can have a good scattering effect on the laser. Therefore, when a laser pen is used to emit laser to the scattering film 4, the scattering film 4 can scatter the laser to multiple different angles, so that users with different viewing angles can see the laser spot.

[0071] After laser irradiation of the display module, it was found that when a scattering film is not set on the display panel, when the laser pen irradiates the laser obliquely to the display module, the laser spot can only be seen at a specific viewing angle, and the laser spot can only be slightly seen or not seen at other viewing positions. Among them, "the laser pen irradiates the laser obliquely to the display module" means that there is an acute angle between the emission direction of the laser and the thickness direction of the display panel. "Specific viewing angle" means that the viewing position and the laser pen are located on both sides of the normal, and the angle between the viewing direction and the normal is equal to the laser irradiation direction. "Normal" refers to a line along the thickness direction of the display panel and passing through the laser irradiation point on the display panel. When a scattering film is set on the display panel, the laser spot can be seen from all directions.

[0072] Fig. 6A This is a schematic diagram of the scattering effect of laser on a display module without a scattering film. Figure 6B for Figure 4Schematic diagram of the scattering effect of the display module on the laser. Figure 6C for Figure 5 Schematic diagram of the scattering effect of the display module on the laser. Figure 4 In the embodiment, the carrier layer 41 includes a polarizing layer 41a, an optical adhesive layer 41b and a transparent substrate layer 41c, and the scattering film 42 is arranged on the surface of the transparent substrate layer 41c; Figure 5 In the embodiment, the carrier layer 41 includes a polarizing layer 41 a , a scattering film 42 is directly disposed on the surface of the polarizing layer 41 a , and a first protective layer 43 is disposed on the scattering particle layer. Figure 4 and Figure 5 More than 90% of the scattering particles in the scattering particle layer have a particle size within the range of [10μm, 25μm], and the average particle size of all scattering particles in the scattering particle layer is within the range of [16μm, 17μm]. FIG. 6A to FIG. 6C In the embodiment, the laser pen obliquely irradiates the laser to the display module. Specifically, the direction in which the laser pen emits the laser forms an angle of 45° with the thickness direction of the display panel. FIG. 6A to FIG. 6C It can be seen that when the display module does not use the scattering film 4, when the laser pen is used to irradiate the display module with laser light at an angle, the laser spot can hardly be seen from the front of the display module. When the display module uses the scattering film 4, when the laser pen is used to irradiate the display module with laser light at an angle, the laser spot can be clearly seen from the front of the display module.

[0073] It can be seen that after a scattering film is set on the display panel, the laser emitted by the laser pen can be scattered at different angles. In this way, during a meeting or teaching process, when the meeting host or teacher uses a laser pen to emit a laser to the display device, in addition to the audience at the above-mentioned "specific viewing angle", the audience at other viewing angles can also see the laser spot, thereby improving the meeting effect or teaching effect and enhancing the user experience.

[0074] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A scattering film, comprising: A scattering particle layer is disposed on the carrier layer, the scattering particle layer comprises a plurality of scattering particles, and a surface of the scattering particle layer away from the carrier layer is a concave-convex surface; Wherein, in the scattering particle layer, more than 90% of the scattering particles have a particle size within the range of [5 μm, 30 μm]; The scattering particle layer further includes a dielectric material layer, through which the plurality of scattering particles are fixed on the supporting layer, and a thickness of the dielectric material layer is less than half of an average particle size of the plurality of scattering particles.

2. The diffuser film according to claim 1, wherein: The average particle size of all scattering particles in the scattering particle layer is in the range of (10 μm, 25 μm].

3. The diffusion film according to claim 1, wherein: The average particle size of all scattering particles in the scattering particle layer is in the range of [14 μm, 25 μm].

4. The diffuser film according to claim 1, wherein: The material of the scattering particles includes inorganic non-metallic material or metal oxide material.

5. The scattering film according to any one of claims 1 to 4, wherein: The scattering film further includes: a first protective layer, which is arranged on a surface of the scattering particle layer away from the supporting layer, and a surface of the first protective layer away from the scattering particle layer is a concave-convex surface.

6. The diffuser film according to claim 5, wherein: In at least a partial region of the scattering particle layer, a surface of the first protective layer facing away from the supporting layer is conformal to a surface of the scattering particle layer facing away from the supporting layer.

7. The diffusion film according to claim 5, wherein: The hardness of the first protection layer is greater than the hardness of the scattering particles.

8. The diffuser film according to claim 5, wherein: The material of the first protective layer includes an inorganic non-metallic material or a metal oxide material.

9. A display module, comprising: A display panel and a scattering film arranged on a light-emitting side of the display panel, wherein the scattering film is the scattering film according to any one of claims 1 to 8, wherein the display panel comprises a bearing layer for bearing the scattering film, and the bearing layer comprises a light-transmitting material.

10. The display module according to claim 9, wherein: The bearing layer includes a polarization layer, and the polarization layer is used to change the polarization state of light passing through the polarization layer.

11. The display module according to claim 10, wherein: The polarizing layer comprises a stacked polarizing layer body and a second protective layer. The scattering film is located on a side of the second protective layer away from the polarizing layer body and is in direct contact with the second protective layer.

12. The display module according to claim 10, wherein: The bearing layer further comprises: A transparent substrate layer, wherein the scattering film is arranged on a surface of the transparent substrate layer away from the polarizing layer; An optical adhesive layer is bonded between the transparent substrate layer and the polarizing layer.

13. The display module according to claim 9, wherein: The display panel is a liquid crystal display panel, and the liquid crystal display panel includes: a liquid crystal layer, a glass substrate located between the liquid crystal layer and the scattering film, The scattering film further comprises: a first protective layer and a dielectric material layer, wherein the first protective layer is arranged on the surface of the scattering particle layer away from the bearing layer, and the scattering particles are fixed on the surface of the bearing layer through the dielectric material layer; Wherein, the refractive index of at least one of the scattering particles, the first protective layer and the dielectric material layer is less than or equal to the refractive index of the glass substrate.

14. The display module according to claim 9, wherein: The display panel is a self-luminous display panel, and the self-luminous display panel includes: a light-emitting unit and at least one film layer arranged between the light-emitting unit and the scattering film, The scattering film further comprises: a first protective layer and a dielectric material layer, wherein the first protective layer is arranged on the surface of the scattering particle layer away from the bearing layer, and the scattering particles are fixed on the surface of the bearing layer through the dielectric material layer; The refractive index of at least one of the scattering particles, the first protective layer and the dielectric material layer is less than or equal to the refractive index of the film layer with the largest refractive index between the light-emitting unit and the scattering film.

15. A display device, wherein: A display module comprising any one of claims 9 to 14.

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