Bundled optical fiber film and preparation method therefor, backlight module and display device

Abstract

A bundled optical fiber film and a preparation method therefor, a backlight module, and a display device. The bundled optical fiber film (100) comprises a film body (10). The film body (10) comprises a plurality of optical fibers (11) and an adhesive material (12) that bonds the plurality of optical fibers (11) together. The adhesive material (12) comprises an adhesive and reflective particles dispersed within the adhesive. The bundled optical fiber film (100) is capable of converging the light within a certain angular range, thereby achieving a light-gathering effect.

Description

Bundled optical fiber film and its preparation method, backlight module and display device

[0001] This application claims priority to Chinese Patent Application No. 202411442453.X, filed on October 16, 2024, entitled "Bubbling Optical Fiber Film and Method for Preparing the Same, Backlight Module and Display Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of optics, and in particular to a bundled optical fiber film and its preparation method, a backlight module, and a display device. Background Technology

[0003] Liquid crystal displays (LCDs) have many advantages such as thinness, energy saving, and no radiation, and are widely used in mobile phones, personal digital assistants (PDAs), digital cameras, computer screens, and laptop screens.

[0004] Most LCD monitors currently on the market are backlit LCD monitors, which mainly consist of a backlight module.

[0005] The backlight module consists of a color filter substrate, a thin-film transistor array (TFT) substrate, and a liquid crystal layer disposed between the two substrates. Its working principle involves applying a driving voltage to the two glass substrates to control the rotation of the liquid crystal molecules in the liquid crystal layer, refracting the light from the backlight module to produce an image. Since the liquid crystal panel itself does not emit light, it needs the light source provided by the backlight module to display images properly; therefore, the backlight module is one of the key components of a liquid crystal display. Technical issues

[0006] However, due to the high divergence angle of the emitted light from the existing backlight module, LCD displays are prone to problems such as light leakage in dark states, color distortion caused by pixel crosstalk, and halos around text and / or patterns. Technical solutions

[0007] Based on this, embodiments of this application provide a bundled optical fiber film and its preparation method, a backlight module, and a display device.

[0008] In a first aspect, embodiments of this application provide a bundled optical fiber membrane, the bundled optical fiber membrane comprising a membrane body, the membrane body comprising multiple optical fibers and an adhesive material for bonding the multiple optical fibers together, the adhesive material comprising an adhesive and reflective particles dispersed in the adhesive, wherein the refractive index of the optical fibers is greater than the refractive index of the adhesive.

[0009] Secondly, embodiments of this application provide a method for preparing a bundled optical fiber film, comprising:

[0010] A plurality of optical fibers and an adhesive material are provided, and the plurality of optical fibers are bonded together using the adhesive material to obtain a fiber bundle;

[0011] The fiber bundle is cut to obtain the membrane body, and the bundled optical fiber membrane includes the membrane body.

[0012] Thirdly, embodiments of this application provide a backlight module, including the clustered fiber film as described above or the clustered fiber film prepared by the method described above.

[0013] Fourthly, embodiments of this application provide a display device including the backlight module described above. Beneficial effects

[0014] The bundled optical fiber film provided in this application includes a film body, which includes multiple optical fibers and an adhesive material that bonds the multiple optical fibers together. The adhesive material includes an adhesive and reflective particles dispersed in the adhesive. Since the refractive index of the optical fibers is greater than that of the adhesive, a total internal reflection interface can be formed at the interface between the optical fibers and the adhesive material, forming an effect similar to that of an optical fiber. Part of the light undergoes total internal reflection at the interface between the optical fibers and the adhesive material and is finally emitted along the extension direction of the optical fibers. Another part of the light is refracted by the optical fibers and the adhesive and reflected by the reflective particles before finally being emitted from the light-emitting surface of the bundled optical fiber film. Furthermore, the angle of the light emitted from the bundled optical fiber film converges to a certain range, achieving the effect of light focusing. When this bundled optical fiber film is applied to the backlight module of a liquid crystal display, it can avoid problems such as dark light leakage at a wide viewing angle due to light divergence, color distortion due to pixel crosstalk, and halos around text and / or patterns, thus improving the display effect and increasing the light output brightness of the liquid crystal display. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the first structure of the bundled optical fiber membrane provided in the embodiment of this application.

[0016] Figure 2 is a schematic diagram of the second structure of the bundled optical fiber membrane provided in the embodiment of this application.

[0017] Figure 3 is a schematic diagram of the third structure of the bundled optical fiber membrane provided in the embodiments of this application.

[0018] Figure 4 is a flowchart of the method for preparing the bundled optical fiber membrane provided in the embodiments of this application.

[0019] Figure 5 is a schematic diagram of the fiber bundle provided in an embodiment of this application.

[0020] Figure 6 is a schematic diagram of cutting fiber bundles according to an embodiment of this application.

[0021] Figure 7 is a schematic diagram of the first structure of the backlight module provided in the embodiment of this application.

[0022] Figure 8 is a schematic diagram of the second structure of the backlight module provided in the embodiment of this application.

[0023] Component Symbol Explanation: 100, Bundled fiber optic film; 10, Film body; 11, Optical fiber; 12, Adhesive material; 21, First protective film; 22, Second protective film; 221, Microstructure; 80, Fiber bundle; 200, Backlight module; 31, First light source; 40, Light guide plate; 41, First bottom surface; 42, First top surface; 32, Second light source; 322, Circuit board; 321, Light-emitting device; 50, Diffuser plate; 51, Second bottom surface; 52, Second top surface; 60, Back plate; 61, Bottom plate; 62, Side plate; 63, Top plate; 71, Support frame; 72, Support column; 73, Foam tape; 90, Reflective sheet; 91, Horizontal part; 92, Inclined part. Embodiments of the present invention

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] Please refer to Figures 1, 2, and 3. This application embodiment provides a bundled optical fiber membrane 100, which includes a membrane body 10. The membrane body 10 includes multiple optical fibers 11 and an adhesive material 12 that bonds the multiple optical fibers 11 together. The adhesive material 12 includes an adhesive and reflective particles dispersed in the adhesive. The refractive index of the optical fibers 11 is greater than the refractive index of the adhesive.

[0026] It should be noted that the working principle of the bundled optical fiber membrane 100 in this application embodiment is as follows:

[0027] Since the refractive index of optical fiber 11 is greater than that of adhesive, a total internal reflection interface can be formed at the interface between optical fiber 11 and adhesive material 12, forming an effect similar to that of optical fiber.

[0028] When light enters the bundled optical fiber membrane 100, a portion of the light that enters the interior of the optical fiber 11 and meets the conditions for total internal reflection can undergo total internal reflection at the interface between the optical fiber 11 and the adhesive material 12 and finally exit along the extension direction of the optical fiber 11.

[0029] Some of the light rays that enter the optical fiber 11 but do not meet the conditions for total internal reflection will enter the adhesive material 12 and be refracted. When the refracted light rays are incident on the surface of the reflective particles, since the outer surface of the reflective particles is curved, the exit direction of the reflected light rays in different areas of the reflective particle surface is different when the parallel light beam is incident on the outer surface of the reflective particles, thereby changing the transmission direction of the light rays. Some of the light rays re-enter the optical fiber 11 and eventually exit along the extension direction of the optical fiber 11.

[0030] A portion of the light incident on the adhesive material changes its transmission direction after being reflected by the reflective particles and finally enters the optical fiber 11 and exits along the extension direction of the optical fiber 11.

[0031] It is understandable that because the adhesive material 12 contains reflective particles, the light transmittance of the adhesive material 12 is poor. That is to say, the light transmittance of the optical fiber 11 is much greater than that of the adhesive material 12. The light incident on the bundled optical fiber membrane 100 eventually exits mainly from the ends of the multiple optical fibers 11.

[0032] It should be noted that the angle between the transmission direction of the light emitted from the bundled optical fiber membrane 100 in this embodiment and the normal to the light-emitting surface of the bundled optical fiber membrane 100 is less than or equal to 30°. In other words, the light is effectively focused, achieving an effect close to collimated light.

[0033] For example, the refractive index of the optical fiber 11 is 1.38 to 1.52, such as 1.38, 1.40, 1.42, 1.45, 1.48, 1.50, 1.52, etc.

[0034] For example, the refractive index of the adhesive is 1.0 to 1.3, such as 1.0, 1.02, 1.05, 1.07, 1.1, 1.12, 1.15, 1.17, 1.2, 1.22, 1.25, 1.27, 1.3, etc.

[0035] For example, the material of the optical fiber 11 includes an organic polymer.

[0036] For example, the organic polymer includes at least one of polypropylene (PP), polyethylene terephthalate (PET), and polystyrene (PS).

[0037] For example, the adhesive material includes thermosetting resins, such as epoxy resins.

[0038] For example, the material of the reflective particles includes at least one of titanium dioxide (TiO2) and zirconium dioxide (ZrO2).

[0039] For example, the average particle size of the reflective particles is 100nm to 5μm, such as 100nm, 500nm, 1μm, 1.5μm, 2μm, 2.5μm, 3μm, 3.5μm, 4μm, 4.5μm, 5μm, etc.

[0040] For example, the mass percentage of the reflective particles in the adhesive material 12 is 1wt% to 70wt%, such as 1wt%, 5wt%, 10wt%, 15wt%, 20wt%, 25wt%, 30wt%, 35wt%, 40wt%, 45wt%, 50wt%, 55wt%, 60wt%, 65wt%, 70wt%, etc.

[0041] For example, the thickness of the membrane body 10 is 300μm to 3.0mm, such as 300μm, 400μm, 500μm, 600μm, 700μm, 800μm, 900μm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, etc.

[0042] In some embodiments, the thickness of the membrane body 10 is 300 μm to 600 μm.

[0043] In other embodiments, the thickness of the membrane body 10 is 0.8 mm to 3.0 mm.

[0044] For example, the diameter of the optical fiber 11 is 10μm to 1000μm, such as 10μm, 50μm, 100μm, 150μm, 200μm, 250μm, 300μm, 350μm, 400μm, 450μm, 500μm, 550μm, 600μm, 650μm, 700μm, 750μm, 800μm, 850μm, 900μm, 950μm, 1000μm, etc.

[0045] For example, the length-to-diameter ratio of the optical fibers 11 in the bundled optical fiber film 100 is greater than or equal to 5; optionally, the length-to-diameter ratio of the optical fibers 11 in the bundled optical fiber film 100 is greater than or equal to 10.

[0046] For example, the ratio of the length to the diameter of the optical fiber 11 in the bundled optical fiber film 100 can be 5, 6, 7, 8, 9, 10, 12, 15, 18, 20, 22, 25, 28, 30, etc.

[0047] It should be noted that when the aspect ratio (length to diameter ratio) of the optical fiber 11 is larger, the focusing effect of the bundled optical fiber membrane 100 on light is better, and the collimation of the light emitted from the bundled optical fiber membrane 100 is higher.

[0048] For example, the ratio of the total mass of the plurality of optical fibers 11 to the mass of the membrane body 10 is 50wt% to 99.5wt%, such as 50wt%, 55wt%, 60wt%, 65wt%, 70wt%, 75wt%, 80wt%, 85wt%, 90wt%, 95wt%, 97wt%, 99.5wt%, etc.

[0049] Please refer to Figures 2 and 3. The bundled optical fiber membrane 100 also includes a first protective film 21, which is disposed on the light-incident side of the membrane body 10.

[0050] Please refer to Figures 2 and 3. The bundled optical fiber membrane 100 also includes a second protective membrane 22, which is disposed on the light-emitting side of the membrane body 10.

[0051] It is understandable that by setting the first protective film 21 and / or the second protective film 22, the membrane body 10 can be protected by the first protective film 21 and / or the second protective film 22, thereby improving the service life of the membrane body 10.

[0052] For example, the materials of the first protective film 21 and the second protective film 22 are both polymers, such as polyethylene terephthalate (PET).

[0053] Please refer to Figure 2. In some embodiments, the second protective film 22 has a planar surface on both the side closest to the film body 10 and the side furthest from the film body 10.

[0054] Please refer to Figure 3. In some embodiments, the surface of the second protective film 22 near the membrane body 10 is planar, and the surface of the second protective film 22 away from the membrane body 10 has microstructures 221.

[0055] It is understandable that by providing a microstructure 221 on the surface of the second protective film 22 away from the film body 10, the collimated light emitted from the bundled fiber film 100 can be appropriately diffused due to the light diffusion function of the microstructure 221, thereby expanding the viewing angle of the display device using the bundled fiber film 100.

[0056] For example, the thickness of the first protective film 21 is 50μm to 150μm, such as 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, etc.

[0057] For example, the thickness of the second protective film 22 is 50μm to 150μm, such as 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, etc.

[0058] It should be noted that when the surface of the second protective film 22 away from the film body 10 has microstructures 221, the thickness of the second protective film 22 refers to the average thickness of each region of the second protective film 22.

[0059] For example, the microstructure 221 includes at least one of a protruding structure and a recessed structure.

[0060] For example, the outer surface of the protruding structure can be an arc surface, or the outer surface of the recessed structure can be an arc surface.

[0061] For example, the protruding structure can be pyramidal, conical, frustum-shaped, or truncated cone-shaped, or the internal space of the recessed structure can be pyramidal, conical, frustum-shaped, or truncated cone-shaped.

[0062] The bundled optical fiber membrane 100 provided in this embodiment includes a membrane body 10, which includes multiple optical fibers 11 and an adhesive material 12 bonding the optical fibers 11 together. The adhesive material 12 includes an adhesive and reflective particles dispersed in the adhesive. Because the refractive index of the optical fibers 11 is greater than that of the adhesive, a total internal reflection interface can be formed at the interface between the optical fibers 11 and the adhesive material 12, creating an effect similar to that of an optical fiber. Part of the light undergoes total internal reflection at the interface between the optical fibers 11 and the adhesive material 12 and is ultimately emitted along the extension direction of the optical fibers 11. A portion of the light is refracted by the optical fiber 11 and the adhesive, and then reflected by the reflective particles before finally exiting from the light-emitting surface of the bundled optical fiber film 100. The angle of the light emitted from the bundled optical fiber film 100 converges to a certain range, achieving the effect of light focusing. When the bundled optical fiber film 100 is applied to the backlight module 200 of a liquid crystal display, it can avoid problems such as dark light leakage at a wide viewing angle due to light divergence, color distortion due to pixel crosstalk, and halos around text and / or patterns, thus improving the display effect and increasing the light output brightness of the liquid crystal display.

[0063] Please refer to Figure 4. This application embodiment provides a method for preparing a bundled optical fiber membrane, used to prepare the bundled optical fiber membrane 100 in any of the above embodiments. The preparation method includes:

[0064] S100, please refer to Figure 5, multiple optical fibers 11 and adhesive material 12 are provided, and the multiple optical fibers 11 are bonded together by the adhesive material 12 to obtain fiber bundle 80.

[0065] For example, the optical fiber 11 is prepared by a drawing process.

[0066] Referring to Figure 5, by way of example, the process of bonding multiple optical fibers 11 together using the adhesive material 12 to obtain a fiber bundle 80 includes:

[0067] The adhesive material 12 is coated on the outer surface of each optical fiber 11, and the adhesive material 12 is dried to obtain the first fiber;

[0068] Arrange multiple first fibers in the same direction to form a bundle;

[0069] The bundle is heated to cure the adhesive material 12 on the surface of the first fiber, thus obtaining the fiber bundle 80.

[0070] It is understood that the purpose of drying the adhesive material 12 is to evaporate the solvent in the adhesive material 12, so that the adhesive material 12 changes from a liquid state to a solid state.

[0071] For example, the adhesive material 12 can be dried by drying. For example, the drying temperature can be 60°C to 100°C (e.g., 60°C, 70°C, 80°C, 90°C, 100°C, etc.), and the drying time can be 5 minutes to 30 minutes (e.g., 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, etc.).

[0072] It is understood that the first fiber includes optical fiber 11 and adhesive material 12 covering the outer surface of optical fiber 11. By drying the adhesive material 12, the outer surface of the first fiber is kept dry, which can prevent adhesion when multiple first fibers are arranged, resulting in inconsistent arrangement directions of multiple first fibers or uneven thickness of adhesive material 12 covering the outer surface of multiple first fibers.

[0073] For example, when the bundle is heated, the heating temperature is 100℃~150℃ (e.g. 100℃, 110℃, 120℃, 130℃, 140℃, 150℃, etc.), and the processing time is 5 minutes~30 minutes (e.g. 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, etc.).

[0074] For example, while the bundle is being heated, pressure can also be applied to the bundle from the periphery to tightly connect multiple optical fibers 11, so as to avoid gaps between adjacent optical fibers 11 that could cause the bundled optical fiber film 100 to crack.

[0075] S200, please refer to Figure 6, the fiber bundle 80 is cut to obtain the membrane body 10, and the bundled optical fiber membrane 100 includes the membrane body 10.

[0076] Referring to Figures 2 and 3, by way of example, after obtaining the membrane body 10, a first protective film 21 is provided on the light-incident side of the membrane body 10, and the bundled optical fiber membrane 100 includes the membrane body 10 and the first protective film 21.

[0077] Please refer to Figures 2 and 3. After obtaining the membrane body 10, a second protective film 22 is provided on the light-emitting side of the membrane body 10. The bundled optical fiber membrane 100 includes the membrane body 10 and the second protective film 22.

[0078] Please refer to Figures 7 and 8. This application embodiment provides a backlight module 200, including the bundled optical fiber film 100 in any of the above embodiments or the bundled optical fiber film 100 prepared by the preparation method of the bundled optical fiber film in any of the above embodiments.

[0079] It should be noted that, since the bundled optical fiber film 100 provided in this application embodiment has the effect of focusing light and thus can improve the brightness of the emitted light, the bundled optical fiber film 100 can replace the brightness enhancement film in the optical film assembly of the backlight module 200.

[0080] Please refer to Figure 7. When the backlight module 200 is a side-lit backlight module, the backlight module 200 further includes a first light source 31 and a light guide plate 40. The light guide plate 40 has a first bottom surface 41 and a first top surface 42 that are disposed opposite to each other. The first light source 31 is disposed on the side where the first bottom surface 41 of the light guide plate 40 is located, and the bundled optical fiber film 100 is disposed on the side where the first top surface 42 of the light guide plate 40 is located.

[0081] Please refer to Figure 8. When the backlight module 200 is a direct-lit backlight module, the backlight module 200 further includes a second light source 32 and a diffuser plate 50. The diffuser plate 50 has a second bottom surface 51 and a second top surface 52 disposed opposite to each other, as well as a side surface connecting the second bottom surface 51 and the second top surface 52. The second light source 32 is disposed on the outside of the side surface of the diffuser plate 50, and the bundled optical fiber film 100 is disposed on the side where the second top surface 52 of the diffuser plate 50 is located.

[0082] Please refer to Figure 8. The backlight module 200 also includes a back plate 60 and a support frame 71. The back plate 60 includes a connected base plate 61 and a side plate 62. The support frame 71 is connected to the side plate 62. The support frame 71 is used to support the diffuser plate 50 and the bundled optical fiber film 100. The second light source 32 is disposed on the base plate 61.

[0083] Please refer to Figure 8. The back plate 60 may also include a top plate 63, which is disposed opposite to the bottom plate 61. The top plate 63 is connected to the side of the side plate 62 away from the bottom plate 61. The top plate 63 and the bundled optical fiber film 100 can be connected by foam tape 73.

[0084] Please refer to Figure 8. The second light source 32 includes a circuit board 322 and a light-emitting device 321 connected to the circuit board 322. The light-emitting device 321 is located on the side of the circuit board 322 away from the base plate 61.

[0085] For example, the light-emitting device 321 is an LED (light-emitting diode), such as a MiniLED.

[0086] Please refer to Figure 8. The backlight module 200 also includes a support column 72. One end of the support column 72 is fixedly connected to the circuit board 322, and the other end abuts against the diffuser plate 50.

[0087] Understandably, by setting the support column 72, the light mixing distance of the backlight module 200 (the distance from the light source to the diffuser plate 50) can be limited, so that the light is diffused and mixed before being emitted from the diffuser plate 50, thereby improving the light emission uniformity of the backlight module 200.

[0088] Please refer to Figure 8. The backlight module 200 also includes a reflective sheet 90. The reflective sheet 90 includes a horizontal portion 91 and an inclined portion 92. The included angle between the horizontal portion 91 and the inclined portion 92 is an obtuse angle. The horizontal portion 91 is disposed on the circuit board 322. The horizontal portion 91 has a hollow area. The light-emitting device 321 is located in the hollow area. One side of the inclined portion 92 is connected to the horizontal portion 91, and the other side is connected to the support frame 71.

[0089] Understandably, by setting the reflector 90, the light utilization rate can be improved, thereby increasing the light output efficiency of the backlight module 200.

[0090] This application embodiment also provides a display device, including the backlight module 200 as described above.

[0091] For example, the display device further includes a display panel, and a backlight module 200 is disposed on the light-incident side of the display panel.

[0092] For example, the display panel is a liquid crystal display panel.

[0093] For example, the display device can be a terminal such as a television, computer monitor, mobile phone, or tablet computer, or it can be a device with a display screen such as a gaming device, augmented reality (AR) device, virtual reality (VR) device, data storage device, audio playback device, video playback device, or wearable device. Wearable devices can be smart bracelets, smart glasses, smartwatches, smart decorations, etc.

[0094] The bundled optical fiber film, its preparation method, backlight module, and display device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A bundled optical fiber membrane, the bundled optical fiber membrane comprising a membrane body, the membrane body comprising a plurality of optical fibers and an adhesive material for bonding the plurality of optical fibers together, the adhesive material comprising an adhesive and reflective particles dispersed in the adhesive, wherein the refractive index of the optical fibers is greater than the refractive index of the adhesive.

2. The bundled optical fiber membrane of claim 1, wherein, The refractive index of the optical fiber is 1.38 to 1.52; and / or, The adhesive has a refractive index of 1.0 to 1.3; and / or, The optical fiber is made of organic polymers.

3. The bundled optical fiber membrane of claim 2, wherein, The organic polymer includes at least one of polypropylene, polyethylene terephthalate, and polystyrene; and / or, The material of the reflective particles includes at least one of titanium dioxide and zirconium dioxide; and / or, The average particle size of the reflective particles is 100 nm to 5 μm; and / or, The mass percentage of the reflective particles in the adhesive material is 1 wt% to 70 wt%.

4. The bundled optical fiber membrane of claim 1, wherein, The thickness of the membrane body is 300 μm to 3.0 mm.

5. The bundled optical fiber membrane of claim 1, wherein, The diameter of the optical fiber is 10μm to 1000μm.

6. The bundled optical fiber membrane of claim 1, wherein, The ratio of the length to the diameter of the optical fibers in the bundled optical fiber film is greater than or equal to 5; optionally, the ratio of the length to the diameter of the optical fibers in the bundled optical fiber film is greater than or equal to 10.

7. The bundled optical fiber membrane of claim 1, wherein, The ratio of the total mass of the optical fibers to the mass of the membrane body is 50 wt% to 99.5 wt%.

8. The bundled optical fiber membrane of claim 1, wherein, The bundled optical fiber membrane also includes a first protective film, which is disposed on the light-incident side of the membrane body.

9. The bundled optical fiber membrane of claim 8, wherein, The thickness of the first protective film is 50μm to 150μm.

10. The bundled optical fiber membrane of claim 1, wherein, The bundled optical fiber membrane also includes a second protective film, which is disposed on the light-emitting side of the membrane body.

11. The bundled optical fiber membrane of claim 10, wherein, The second protective film has a planar surface on both the side closest to the film body and the side furthest from the film body.

12. The bundled optical fiber membrane of claim 10, wherein, The surface of the second protective film near the membrane body is planar, while the surface of the second protective film away from the membrane body has a microstructure.

13. The bundled optical fiber membrane of claim 10, wherein, The thickness of the second protective film is 50μm to 150μm.

14. A method for preparing a bundled optical fiber membrane, comprising: A plurality of optical fibers and an adhesive material are provided, and the plurality of optical fibers are bonded together using the adhesive material to obtain a fiber bundle; The fiber bundle is cut to obtain the membrane body, and the bundled optical fiber membrane includes the membrane body.

15. The method of claim 14, wherein the step of applying the binder solution is performed by a method selected from the group consisting of spin coating, dip coating, spray coating, and combinations thereof. The process of bonding multiple optical fibers together using the adhesive material to obtain a fiber bundle includes: The adhesive material is coated on the outer surface of each optical fiber, and the adhesive material is dried to obtain the first fiber; Arrange multiple first fibers in the same direction to form a bundle; The bundle is heated to cure the adhesive material on the surface of the first fiber, thus obtaining the fiber bundle.

16. The method of claim 15, wherein the step of applying the binder solution is performed by a method selected from the group consisting of spin coating, dip coating, spray coating, and combinations thereof. When the bundle is heated, the heating temperature is 100℃~150℃, and the treatment time is 5 minutes~30 minutes; and / or, While the bundle is being heated, pressure is applied to the bundle from its periphery to tightly connect multiple optical fibers.

17. The method of claim 14, wherein the step of applying the binder solution is performed by a method selected from the group consisting of spin coating, dip coating, spray coating, and combinations thereof. After obtaining the membrane body, a first protective film is disposed on the light-incident side of the membrane body, wherein the bundled optical fiber membrane includes the membrane body and the first protective film; and / or, After obtaining the membrane body, a second protective film is provided on the light-emitting side of the membrane body. The bundled optical fiber membrane includes the membrane body and the second protective film.

18. A backlight module comprising a bundled optical fiber film as described in any one of claims 1-13 or a bundled optical fiber film prepared by a method described in any one of claims 14-17.

19. The backlight module of claim 18, wherein, The backlight module further includes a first light source and a light guide plate. The light guide plate has a first bottom surface and a first top surface disposed opposite to each other. The first light source is disposed on the side where the first bottom surface of the light guide plate is located, and the bundled optical fiber film is disposed on the side where the first top surface of the light guide plate is located; or... The backlight module further includes a second light source and a diffuser plate. The diffuser plate has a second bottom surface and a second top surface that are disposed opposite to each other, and a side surface that connects the second bottom surface and the second top surface. The second light source is disposed on the outside of the side surface of the diffuser plate, and the bundled optical fiber film is disposed on the side where the second top surface of the diffuser plate is located.

20. A display device comprising a backlight module as described in any one of claims 18-19.

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