Bundled optical fiber membrane and preparation method thereof, backlight module and display device

Abstract

The embodiment of the invention provides a clustered optical fiber membrane and a preparation method thereof, a backlight module and a display device. The clustered optical fiber membrane comprises a membrane body, the membrane body comprises a plurality of optical fibers and a bonding material for bonding the plurality of optical fibers together, and the bonding material comprises an adhesive and reflective particles dispersed in the adhesive. Therefore, a total reflection interface can be formed at the interface of the optical fiber and the adhesive material, an effect similar to an optical fiber is formed, and a part of light is totally reflected at the interface of the optical fiber and the adhesive material and finally is emitted along the extension direction of the optical fiber. And the other part of the light is refracted by the optical fiber and the adhesive and reflected by the reflecting particles, and finally is emitted from the light emitting surface of the beam concentration optical fiber film, and the angle of the light emitted from the beam concentration optical fiber film is converged to a certain range, so that the light concentration effect is realized.

Description

Technical Field

[0001] The present application relates to the field of optics, and in particular to a bundled optical fiber film and a preparation method thereof, a backlight module and a display device. Background Art

[0002] Liquid Crystal Display (LCD) has many advantages such as thin body, power saving, and no radiation, and has been widely used, such as: mobile phones, personal digital assistants (PDAs), digital cameras, computer screens or laptop screens, etc.

[0003] Most of the liquid crystal displays on the current market are backlight type liquid crystal displays, which mainly include a backlight module and a liquid crystal panel arranged on the backlight module. The structure of the traditional liquid crystal panel is composed of a color filter substrate, a thin film transistor array substrate (Thin Film Transistor Array Substrate, TFT Array Substrate) and a liquid crystal layer (Liquid Crystal Layer) disposed between the two substrates. Its working principle is to control the rotation of the liquid crystal molecules of the liquid crystal layer by applying a driving voltage on the two glass substrates, and refract the light of the backlight module to produce a picture. Since the liquid crystal panel itself does not emit light, it needs to rely on the light source provided by the backlight module to display the image normally. Therefore, the backlight module becomes one of the key components of the liquid crystal display.

[0004] However, since the divergence angle of the emitted light of the existing backlight module is relatively high, the liquid crystal display is prone to problems such as dark state light leakage, color cast caused by pixel crosstalk, and halo around text and / or patterns. Summary of the invention

[0005] Based on this, the embodiments of the present application provide a bundled optical fiber film and a preparation method thereof, a backlight module and a display device.

[0006] In a first aspect, an embodiment of the present application provides a bundled optical fiber membrane, wherein the bundled optical fiber membrane includes a membrane body, wherein the membrane body includes a plurality of optical fibers and an adhesive material for bonding the plurality of optical fibers together, wherein the adhesive material includes an adhesive and reflective particles dispersed in the adhesive, and the refractive index of the optical fibers is greater than the refractive index of the adhesive.

[0007] In some embodiments, the refractive index of the optical fiber is 1.38 to 1.52; and / or,

[0008] The refractive index of the adhesive is 1.0 to 1.3; and / or,

[0009] The material of the optical fiber includes an organic polymer.

[0010] In some embodiments, the organic polymer comprises at least one of polypropylene, polyethylene terephthalate, and polystyrene; and / or,

[0011] The material of the reflective particles includes at least one of titanium dioxide and zirconium dioxide; and / or,

[0012] The average particle size of the reflective particles is 100 nm to 5 μm; and / or,

[0013] The reflective particles in the adhesive material account for 1 wt% to 70 wt%.

[0014] In some embodiments, the thickness of the membrane body is 300 μm to 3.0 mm; and / or,

[0015] The diameter of the optical fiber is 10 μm to 1000 μm; and / or,

[0016] The ratio of the length to the diameter of the optical fiber in the bundled optical fiber membrane is greater than or equal to 5; optionally, the ratio of the length to the diameter of the optical fiber in the bundled optical fiber membrane is greater than or equal to 10; and / or,

[0017] The ratio of the total mass of the plurality of optical fibers to the mass of the membrane body is 50 wt % to 99.5 wt %.

[0018] In some embodiments, the bundled optical fiber membrane further comprises a first protective film, wherein the first protective film is disposed on the light incident side of the membrane body; and / or,

[0019] The bundled optical fiber membrane further comprises a second protective film, which is arranged on the light-emitting side of the membrane body.

[0020] In some embodiments, a surface of the second protective film on one side close to the film body and a surface of the second protective film on one side away from the film body are both planes; or,

[0021] A surface of the second protective film on one side close to the film body is flat, and a surface of the second protective film on one side away from the film body has a microstructure; and / or,

[0022] The thickness of the second protective film is 50 μm to 150 μm; and / or,

[0023] The second protective film has a thickness of 50 μm to 150 μm.

[0024] In a second aspect, an embodiment of the present application provides a method for preparing a bundled optical fiber membrane, comprising:

[0025] Providing a plurality of optical fibers and an adhesive material, and bonding the plurality of optical fibers together using the adhesive material to obtain a fiber bundle;

[0026] The fiber bundle is cut to obtain a membrane body, and the bundled optical fiber membrane includes a membrane body.

[0027] In some embodiments, the step of bonding the plurality of optical fibers together using the adhesive material to obtain a fiber bundle comprises:

[0028] Applying the adhesive material on the outer surface of each of the optical fibers and drying the adhesive material to obtain a first fiber;

[0029] Arranging a plurality of the first fibers in the same direction into a bundle;

[0030] The bundle is subjected to a heating treatment to solidify the adhesive material on the surface of the first fiber, thereby obtaining the fiber bundle.

[0031] In some embodiments, when the bundle is subjected to heat treatment, the heating temperature is 100° C. to 150° C. and the treatment time is 5 minutes to 30 minutes; and / or,

[0032] While the bundle is being heated, pressure is applied to the bundle from the periphery of the bundle to tightly connect the plurality of optical fibers.

[0033] In some embodiments, after obtaining the membrane body, a first protective film is disposed on the light incident side of the membrane body, and the bundled optical fiber membrane includes the membrane body and the first protective film; and / or,

[0034] After the membrane body is obtained, a second protective film is arranged on the light-emitting side of the membrane body, and the bundled optical fiber membrane includes the membrane body and the second protective film.

[0035] In a third aspect, an embodiment of the present application provides a backlight module, comprising the above-mentioned bundled optical fiber film or the bundled optical fiber film prepared by the above-mentioned method for preparing the bundled optical fiber film.

[0036] In some embodiments, 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 arranged opposite to each other, the first light source is arranged on the side where the first bottom surface of the light guide plate is located, and the bundled optical fiber film is arranged on the side where the first top surface of the light guide plate is located; or,

[0037] The backlight module also includes a second light source and a diffusion plate, the diffusion plate having a second bottom surface and a second top surface arranged opposite to each other and a side surface connecting the second bottom surface and the second top surface, the second light source is arranged on the outside of the side surface of the diffusion plate, and the bundled optical fiber film is arranged on the side where the second top surface of the diffusion plate is located.

[0038] In a fourth aspect, an embodiment of the present application provides a display device, comprising the backlight module as described above.

[0039] The clustered optical fiber membrane provided in the embodiment of the present application includes a membrane body, which includes a plurality of optical fibers and an adhesive material for bonding the plurality of optical fibers together, wherein the adhesive material includes an adhesive and reflective particles dispersed in the adhesive. Since the refractive index of the optical fiber is greater than the refractive index of the adhesive, a total reflection interface can be formed at the interface between the optical fiber and the adhesive material, forming an effect similar to that of an optical fiber. A portion of the light is totally reflected at the interface between the optical fiber and the adhesive material and finally emerges along the extension direction of the optical fiber. Another portion of the light is refracted by the optical fiber and the adhesive and reflected by the reflective particles, and finally emerges from the light-emitting surface of the clustered optical fiber membrane. The angle of the light emitted from the clustered optical fiber membrane will converge within a certain range, thereby achieving a light-gathering effect. When the clustered optical fiber membrane is applied to the backlight module of a liquid crystal display, it can avoid problems such as dark state light leakage at a large viewing angle due to light divergence, color cast caused by pixel crosstalk, and halo around text and / or patterns on the liquid crystal display, thereby improving the display effect and the light output brightness of the liquid crystal display. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments.

[0041] Figure 1 This is a schematic diagram of the first structure of the bundled optical fiber membrane provided in an embodiment of the present application.

[0042] Figure 2 This is a schematic diagram of the second structure of the bundled optical fiber membrane provided in an embodiment of the present application.

[0043] Figure 3 This is a schematic diagram of the third structure of the bundled optical fiber membrane provided in an embodiment of the present application.

[0044] Figure 4 This is a flow chart of a method for preparing a bundled optical fiber membrane provided in an embodiment of the present application.

[0045] Figure 5 A schematic diagram of a fiber bundle provided in an embodiment of the present application.

[0046] Figure 6A schematic diagram of cutting a fiber bundle provided in an embodiment of the present application.

[0047] Figure 7 This is a schematic diagram of the first structure of the backlight module provided in the embodiment of the present application.

[0048] Figure 8 A second structural schematic diagram of the backlight module provided in an embodiment of the present application.

[0049] Component Symbols:

[0050] 100, bundled optical fiber 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; 51, second bottom surface; 52, second top surface; 60, back panel; 61, bottom panel; 62, side panel; 63, top panel; 71, support frame; 72, support column; 73, foam tape; 90, reflector; 91, horizontal portion; 92, inclined portion. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0052] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0054] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0056] See also Figure 1 , Figure 2 and Figure 3 The embodiment of the present application provides a bundled optical fiber membrane 100, wherein the bundled optical fiber membrane 100 includes a membrane body 10, wherein the membrane body 10 includes a plurality of optical fibers 11 and an adhesive material 12 for bonding the plurality of optical fibers 11 together, wherein the adhesive material 12 includes an adhesive and reflective particles dispersed in the adhesive, and the refractive index of the optical fibers 11 is greater than the refractive index of the adhesive.

[0057] It should be noted that the working principle of the bundled optical fiber membrane 100 of the embodiment of the present application is:

[0058] Since the refractive index of the optical fiber 11 is greater than that of the adhesive, a total reflection interface can be formed at the interface between the optical fiber 11 and the adhesive material 12, forming an effect similar to that of an optical fiber;

[0059] When light enters the bundled optical fiber film 100, a portion of the light that enters the interior of the optical fiber 11 and meets the total reflection condition can be totally reflected at the interface between the optical fiber 11 and the adhesive material 12 and finally emitted along the extension direction of the optical fiber 11;

[0060] A portion of the light that enters the optical fiber 11 but does not meet the total reflection condition will enter the adhesive material 12 and be refracted. When the refracted light is incident on the surface of the reflective particle, since the outer surface of the reflective particle is a curved surface, when the parallel light beam is incident on the outer surface of the reflective particle, the reflected light in different areas of the reflective particle surface has different emission directions, thereby changing the transmission direction of the light, and a portion of the light re-enters the optical fiber 11 and finally emits along the extension direction of the optical fiber 11;

[0061] A portion of the light incident into the adhesive material finally enters the optical fiber 11 after being reflected by the reflective particles and changing the transmission direction, and is emitted along the extension direction of the optical fiber 11 .

[0062] It is understandable that since the adhesive material 12 contains reflective particles, the light transmittance of the adhesive material 12 is poor, that is, the light transmittance of the optical fiber 11 is much greater than the light transmittance of the adhesive material 12, and the light incident on the bundled optical fiber membrane 100 is ultimately mainly emitted from the ends of the multiple optical fibers 11.

[0063] It should be noted that the angle between the transmission direction of the light emitted from the bundled optical fiber membrane 100 of the embodiment of the present application and the normal perpendicular to the light-emitting surface of the bundled optical fiber membrane 100 is less than or equal to 30°, that is, the light is effectively gathered to achieve an effect close to collimated light.

[0064] Exemplarily, the refractive index of the optical fiber 11 is 1.38-1.52, for example, 1.38, 1.40, 1.42, 1.45, 1.48, 1.50, 1.52, etc.

[0065] Illustratively, the refractive index of the adhesive is 1.0 to 1.3, for example, 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.

[0066] Exemplarily, the material of the optical fiber 11 includes an organic polymer.

[0067] Exemplarily, the organic polymer includes at least one of polypropylene (PP), polyethylene terephthalate (PET) and polystyrene (PS).

[0068] Exemplarily, the material of the adhesive includes a thermosetting resin, such as epoxy resin.

[0069] Exemplarily, the material of the reflective particles includes at least one of titanium dioxide (TiO2) and zirconium dioxide (ZrO2).

[0070] Exemplarily, the average particle size of the reflective particles is 100 nm to 5 μm, for example, 100 nm, 500 nm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, 5 μm, etc.

[0071] Exemplarily, the mass percentage of the reflective particles in the adhesive material 12 is 1wt% to 70wt%, for example, 1wt%, 5wt%, 10wt%, 15wt%, 20wt%, 25wt%, 30wt%, 35wt%, 40wt%, 45wt%, 50wt%, 55wt%, 60wt%, 65wt%, 70wt%, etc.

[0072] Exemplarily, the thickness of the membrane body 10 is 300 μm to 3.0 mm, for example, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3 mm, etc.

[0073] In some embodiments, the thickness of the membrane body 10 is 300 μm to 600 μm.

[0074] In other embodiments, the thickness of the membrane body 10 is 0.8 mm to 3.0 mm.

[0075] Exemplarily, the diameter of the optical fiber 11 is 10μm to 1000μm, for example, 10μm, 50μm, 100μm, 150μm, 200μm, 250μm, 300μm, 350μm, 400μm, 450μm, 500μm, 550μm, 600μm, 650μm, 700μm, 750μm, 800μm, 850μm, 900μm, 950μm, 1000μm, etc.

[0076] Exemplarily, the ratio of the length to the diameter of the optical fiber 11 in the bundled optical fiber film 100 is greater than or equal to 5; optionally, the ratio of the length to the diameter of the optical fiber 11 in the bundled optical fiber film 100 is greater than or equal to 10.

[0077] Illustratively, the ratio of the length to the diameter of the optical fiber 11 in the bundled optical fiber film 100 may be 5, 6, 7, 8, 9, 10, 12, 15, 18, 20, 22, 25, 28, 30, or the like.

[0078] It should be noted that, when the aspect ratio (ratio of length to diameter) of the optical fiber 11 is larger, the light-gathering effect of the bundled optical fiber film 100 is better, and the collimation of the light emitted from the bundled optical fiber film 100 is higher.

[0079] Exemplarily, the ratio of the total mass of the multiple optical fibers 11 to the mass of the membrane body 10 is 50wt% to 99.5wt%, for example, 50wt%, 55wt%, 60wt%, 65wt%, 70wt%, 75wt%, 80wt%, 85wt%, 90wt%, 95wt%, 97wt%, 99.5wt%, etc.

[0080] See also Figure 2 and Figure 3 The bundled optical fiber membrane 100 further includes a first protective film 21 , which is disposed on the light incident side of the membrane body 10 .

[0081] See also Figure 2 and Figure 3 The bundled optical fiber membrane 100 further includes a second protective film 22 , and the second protective film 22 is disposed on the light emitting side of the membrane body 10 .

[0082] It can be understood that by providing 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 increasing the service life of the membrane body 10 .

[0083] Exemplarily, the materials of the first protective film 21 and the second protective film 22 are both polymers, such as polyethylene terephthalate (PET).

[0084] See also Figure 2 In some embodiments, a surface of the second protective film 22 on one side close to the film body 10 and a surface of the second protective film 22 on one side away from the film body 10 are both planes.

[0085] See also Figure 3 In some embodiments, a surface of the second protective film 22 close to the film body 10 is flat, and a surface of the second protective film 22 away from the film body 10 has a microstructure 221 .

[0086] It can be understood that by setting the microstructure 221 on the side surface of the second protective film 22 away from the film body 10, since the microstructure 221 has a light diffusion function, the collimated light emitted from the bundled optical fiber film 100 can be properly diverged, thereby expanding the viewing angle of the display device using the bundled optical fiber film 100.

[0087] Exemplarily, the thickness of the first protective film 21 is 50 μm to 150 μm, for example, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, etc.

[0088] Exemplarily, the thickness of the second protection film 22 is 50 μm to 150 μm, for example, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, etc.

[0089] It should be noted that, when the surface of the second protective film 22 away from the film body 10 has a microstructure 221 , the thickness of the second protective film 22 refers to the average value of the thickness of each region of the second protective film 22 .

[0090] Exemplarily, the microstructure 221 includes at least one of a protruding structure and a recessed structure.

[0091] Exemplarily, the outer surface of the protruding structure may be a curved surface, or the outer surface of the concave structure may be a curved surface.

[0092] Illustratively, the protruding structure may be in the shape of a pyramid, a cone, a prism or a truncated cone, or the inner space of the recessed structure may be in the shape of a pyramid, a cone, a prism or a truncated cone.

[0093] The bundled optical fiber membrane 100 provided in the embodiment of the present application comprises a membrane body 10, wherein the membrane body 10 comprises a plurality of optical fibers 11 and an adhesive material 12 for bonding the plurality of optical fibers 11 together, wherein the adhesive material 12 comprises an adhesive and reflective particles dispersed in the adhesive, and since the refractive index of the optical fiber 11 is greater than the refractive index of the adhesive, a total reflection interface can be formed at the interface between the optical fiber 11 and the adhesive material 12, forming an effect similar to that of an optical fiber, in which a part of the light is totally reflected at the interface between the optical fiber 11 and the adhesive material 12 and finally emitted along the extension direction of the optical fiber 11, and another ... After a part of the light is refracted by the optical fiber 11 and the adhesive and reflected by the reflective particles, it is finally emitted from the light-emitting surface of the bundled optical fiber film 100, and the angle of the light emitted from the bundled optical fiber film 100 will converge to a certain range, achieving the effect of light gathering. When the bundled optical fiber film 100 is applied to the backlight module 200 of a liquid crystal display, it can avoid the problems of dark light leakage at a large viewing angle due to light divergence, color cast caused by pixel crosstalk, and halo around text and / or patterns in the liquid crystal display, thereby improving the display effect and the light output brightness of the liquid crystal display.

[0094] See also Figure 4The present application embodiment provides a method for preparing a bundled optical fiber membrane, which is used to prepare the bundled optical fiber membrane 100 in any of the above embodiments. The preparation method includes:

[0095] S100, see Figure 5 , provide a plurality of optical fibers 11 and an adhesive material 12, and use the adhesive material 12 to bond the plurality of optical fibers 11 together to obtain a fiber bundle 80.

[0096] Exemplarily, the optical fiber 11 is prepared by a wire drawing process.

[0097] See also Figure 5 Exemplarily, the step of bonding the plurality of optical fibers 11 together using the adhesive material 12 to obtain the fiber bundle 80 includes:

[0098] The adhesive material 12 is coated on the outer surface of each of the optical fibers 11, and the adhesive material 12 is dried to obtain a first fiber;

[0099] Arranging a plurality of the first fibers in the same direction into a bundle;

[0100] The bundle is heated to solidify the adhesive material 12 on the surface of the first fibers, thereby obtaining the fiber bundle 80 .

[0101] It can be understood that the purpose of drying the adhesive material 12 is to volatilize the solvent in the adhesive material 12 so as to convert the adhesive material 12 from liquid to solid.

[0102] Exemplarily, the adhesive material 12 can be dried by drying. Exemplarily, the drying temperature can be 60°C to 100°C (for example, 60°C, 70°C, 80°C, 90°C, 100°C, etc.), and the drying time can be 5 minutes to 30 minutes (for example, 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, etc.).

[0103] It can be understood that the first fiber includes an optical fiber 11 and an adhesive material 12 coated on the outer surface of the optical fiber 11. After the adhesive material 12 is dried, the outer surface of the first fiber obtained remains dry, which can avoid adhesion when arranging multiple first fibers, resulting in inconsistent arrangement directions of the multiple first fibers or uneven thickness of the adhesive material 12 coated on the outer surfaces of the multiple first fibers.

[0104] Exemplarily, when the bundle is heat treated, the heating temperature is 100°C to 150°C (for example, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, etc.), and the treatment time is 5 minutes to 30 minutes (for example, 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, etc.).

[0105] Illustratively, while the bundle is being heated, pressure may be applied to the bundle from the periphery thereof to tightly connect the plurality of optical fibers 11, thereby avoiding gaps between adjacent optical fibers 11 and thus causing cracks in the bundled optical fiber membrane 100.

[0106] S200, see Figure 6 , the fiber bundle 80 is cut to obtain a membrane body 10 , and the bundled optical fiber membrane 100 includes the membrane body 10 .

[0107] Please combine Figure 2 and Figure 3 Exemplarily, after the membrane body 10 is obtained, a first protective film 21 is disposed 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 .

[0108] See also Figure 2 and Figure 3 After the membrane body 10 is obtained, a second protective film 22 is disposed 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 .

[0109] See also Figure 7 and Figure 8 The embodiment of the present application 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 100 in any of the above embodiments.

[0110] It should be noted that, since the bundled optical fiber film 100 provided in the embodiment of the present application has the effect of converging light and thus can improve the brightness of light output, the bundled optical fiber film 100 can replace the brightness enhancement film in the optical film assembly of the backlight module 200 .

[0111] See also Figure 7 When the backlight module 200 is an edge-entry backlight module, the backlight module 200 also 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 relatively arranged, the first light source 31 is arranged on the side where the first bottom surface 41 of the light guide plate 40 is located, and the clustered optical fiber film 100 is arranged on the side where the first top surface 42 of the light guide plate 40 is located.

[0112] See also Figure 8 When the backlight module 200 is a direct-type backlight module, the backlight module 200 also includes a second light source 32 and a diffuser 50, the diffuser 50 having a second bottom surface 51 and a second top surface 52 that are relatively arranged and a side surface connecting the second bottom surface 51 and the second top surface 52, the second light source 32 is arranged on the outside of the side surface of the diffuser 50, and the clustered optical fiber film 100 is arranged on the side where the second top surface 52 of the diffuser 50 is located.

[0113] See also Figure 8 The backlight module 200 also includes a back panel 60 and a support frame 71. The back panel 60 includes a bottom panel 61 and a side panel 62 connected to each other. The support frame 71 is connected to the side panel 62. The support frame 71 is used to support the diffuser 50 and the bundled optical fiber film 100. The second light source 32 is arranged on the bottom panel 61.

[0114] See also Figure 8 The back plate 60 may further include a top plate 63, which is arranged opposite to the bottom plate 61, and is connected to a side of the side plate 62 away from the bottom plate 61, and the top plate 63 and the bundled optical fiber membrane 100 may be connected by a foam tape 73.

[0115] See also 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 arranged on a side of the circuit board 322 away from the bottom plate 61 .

[0116] Exemplarily, the light emitting device 321 is an LED (light-emitting diode), such as a MiniLED.

[0117] See also Figure 8 The backlight module 200 further includes a support column 72 , one end of which is fixedly connected to the circuit board 322 , and the other end of which abuts against the diffusion plate 50 .

[0118] It is understandable that by providing the support column 72 , the light mixing distance of the backlight module 200 (the distance from the light source to the diffuser 50 ) can be limited, so that the light is diverged and mixed before being emitted from the diffuser 50 , thereby improving the light uniformity of the backlight module 200 .

[0119] See also Figure 8The backlight module 200 also includes a reflective sheet 90, which includes a horizontal portion 91 and an inclined portion 92. The angle between the horizontal portion 91 and the inclined portion 92 is an obtuse angle. The horizontal portion 91 is arranged on the circuit board 322. A hollow area is provided on the horizontal portion 91. 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.

[0120] It is understandable that by providing the reflective sheet 90 , the light utilization rate can be improved, thereby improving the light extraction efficiency of the backlight module 200 .

[0121] The embodiment of the present application further provides a display device, comprising the backlight module 200 as described above.

[0122] Exemplarily, the display device further includes a display panel, and the backlight module 200 is disposed on the light incident side of the display panel.

[0123] Exemplarily, the display panel is a liquid crystal display panel.

[0124] Exemplarily, the display device can be a terminal such as a television, a computer monitor, a mobile phone, a tablet computer, or a gaming device, an augmented reality (AR) device, a virtual reality (VR) device, a data storage device, an audio playback device, a video playback device, a wearable device, or other device with a display screen, wherein the wearable device can be a smart bracelet, smart glasses, a smart watch, smart decoration, etc.

[0125] The above is a detailed introduction to the bundled optical fiber film and its preparation method, backlight module and display device provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application. At the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A bundled optical fiber membrane, characterized in that: The bundled optical fiber membrane includes a membrane body, which includes multiple optical fibers and an adhesive material for bonding the multiple optical fibers together. The adhesive material includes an adhesive and reflective particles dispersed in the adhesive. The refractive index of the optical fiber is greater than the refractive index of the adhesive.

2. The bundled optical fiber membrane according to claim 1, characterized in that: The refractive index of the optical fiber is 1.38 to 1.52; and / or, The refractive index of the adhesive is 1.0 to 1.3; and / or, The material of the optical fiber includes an organic polymer.

3. The bundled optical fiber membrane according to claim 2, characterized in that: The organic polymer comprises 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 reflective particles in the adhesive material account for 1 wt% to 70 wt%.

4. The bundled optical fiber membrane according to claim 1, characterized in that: The thickness of the membrane body is 300 μm to 3.0 mm; and / or, The diameter of the optical fiber is 10 μm to 1000 μm; and / or, The ratio of the length to the diameter of the optical fiber in the bundled optical fiber membrane is greater than or equal to 5; optionally, the ratio of the length to the diameter of the optical fiber in the bundled optical fiber membrane is greater than or equal to 10; and / or, The ratio of the total mass of the plurality of optical fibers to the mass of the membrane body is 50 wt % to 99.5 wt %.

5. The bundled optical fiber membrane according to claim 1, characterized in that: The bundled optical fiber membrane further includes a first protective film, which is arranged on the light incident side of the membrane body; and / or, The bundled optical fiber membrane further comprises a second protective film, which is arranged on the light-emitting side of the membrane body.

6. The bundled optical fiber membrane according to claim 5, characterized in that: The second protective film has a surface on one side close to the film body and a surface on one side away from the film body that are both planes; or, A surface of the second protective film on one side close to the film body is flat, and a surface of the second protective film on one side away from the film body has a microstructure; and / or, The thickness of the second protective film is 50 μm to 150 μm; and / or, The second protective film has a thickness of 50 μm to 150 μm.

7. A method for preparing a bundled optical fiber membrane, characterized in that: include: Providing a plurality of optical fibers and an adhesive material, and bonding the plurality of optical fibers together using the adhesive material to obtain a fiber bundle; The fiber bundle is cut to obtain a membrane body, and the bundled optical fiber membrane includes a membrane body.

8. The method for preparing a bundled optical fiber membrane according to claim 7, characterized in that: The step of bonding the plurality of optical fibers together using the adhesive material to obtain a fiber bundle comprises: Applying the adhesive material on the outer surface of each of the optical fibers and drying the adhesive material to obtain a first fiber; Arranging a plurality of the first fibers in the same direction into a bundle; The bundle is subjected to a heating treatment to solidify the adhesive material on the surface of the first fiber, thereby obtaining the fiber bundle.

9. The method for preparing a bundled optical fiber membrane according to claim 8, characterized in that: When the bundle is subjected to heat treatment, the heating temperature is 100° C. to 150° C. and the treatment time is 5 minutes to 30 minutes; and / or, While the bundle is being heated, pressure is applied to the bundle from the periphery of the bundle to tightly connect the plurality of optical fibers.

10. The method for preparing a bundled optical fiber membrane according to claim 7, characterized in that: After obtaining the membrane body, a first protective film is arranged on the light incident side of the membrane body, wherein the bundled optical fiber membrane comprises the membrane body and the first protective film; and / or, After the membrane body is obtained, a second protective film is arranged on the light-emitting side of the membrane body, and the bundled optical fiber membrane includes the membrane body and the second protective film.

11. A backlight module, characterized in that: The invention comprises the bundled optical fiber membrane as claimed in any one of claims 1 to 6 or the bundled optical fiber membrane prepared by the method for preparing the bundled optical fiber membrane as claimed in any one of claims 7 to 10.

12. The backlight module according to claim 11, characterized in that: 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 arranged opposite to each other, the first light source is arranged on the side where the first bottom surface of the light guide plate is located, and the bundled optical fiber film is arranged on the side where the first top surface of the light guide plate is located; or, The backlight module also includes a second light source and a diffusion plate, the diffusion plate having a second bottom surface and a second top surface arranged opposite to each other and a side surface connecting the second bottom surface and the second top surface, the second light source is arranged on the outside of the side surface of the diffusion plate, and the bundled optical fiber film is arranged on the side where the second top surface of the diffusion plate is located.

13. A display device, characterized in that: Comprising the backlight module as described in any one of claims 11-12.

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