Optical element, backlight module and display device

Abstract

The invention provides an optical element, a backlight module and a display device. The optical element comprises a base body and a reinforcing structure, and the reinforcing structure is dispersed in the base body. The optical element can meet the structural and optical requirements of a large-size and narrow-frame display module under the condition that an external structural back plate is not needed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to an optical element, a backlight module and a display device. BACKGROUND

[0002] Liquid crystal display modules are mainly divided into two types of direct type and side type in structure. In small and medium-sized display devices, the way of adhering diaphragm and liquid crystal panel is often used to achieve ultra-thin design, or the side type backlight structure is further used to reduce the thickness of the module. However, in large-sized display modules, in order to balance the structure rigidity and optical performance, the optical diaphragm, diffusion plate and other optical elements usually need to rely on the structural back plate to support, and ensure the stability of the overall structure.

[0003] The optical diaphragm substrate used in the traditional liquid crystal display module is mostly polyethylene terephthalate, and the diffusion plate is mostly made of polystyrene or methyl methacrylate-styrene copolymer. The thermal expansion coefficient of these materials is usually in the range of 60 to 80 ppm / ℃, which is difficult to meet the strict requirements of size stability of large-sized, narrow-frame or frameless display modules. Especially in the temperature changing environment, the thermal expansion and contraction of the material can easily cause the deformation of the optical components, and then cause adverse optical phenomena such as Mura, which affects the display quality.

[0004] In addition, in order to maintain the structural strength, the existing large-sized display module must use a metal or plastic structural back plate, which not only increases the overall thickness of the module, but also limits the further narrowing of the frame.

[0005] Therefore, there is an urgent need in the art for an optical element with high strength and low thermal expansion coefficient, which can meet the structural and optical requirements of large-sized, narrow-frame display modules without the aid of an external structural back plate. SUMMARY

[0006] The embodiments of the present application provide an optical element, a backlight module and a display device, which can meet the structural and optical requirements of large-sized, narrow-frame display modules without the aid of an external structural back plate.

[0007] The embodiments of the present application provide an optical element, which comprises: a base body; a reinforcing structure dispersed in the base body.

[0008] In some embodiments, the reinforcing structure is a fibrous reinforcing body.

[0009] In some embodiments, the fibrous reinforcing body is glass fiber.

[0010] In some embodiments, the optical element is a brightness enhancement film, and the brightness enhancement film further comprises a prismatic layer disposed on the substrate.

[0011] In some embodiments, the prismatic layer comprises a plurality of spaced-apart prism structures or pyramid structures.

[0012] In some embodiments, the optical element is a diffusion plate, and the diffusion plate further comprises a diffusion structure disposed in the substrate.

[0013] In some embodiments, the diffusion structure is a hollow structure.

[0014] In some embodiments, the hollow structure is a spherical structure or an ellipsoidal structure.

[0015] Embodiments of the present application also provide a backlight module comprising the optical element.

[0016] In some embodiments, the backlight module further comprises a back plate and a lamp bead, the lamp bead is disposed on the back plate; the optical element is disposed on the light-emitting side of the lamp bead, the back plate comprises a metal substrate and a circuit layer, the circuit layer is disposed on the metal substrate, and the circuit layer is electrically connected with the lamp bead.

[0017] In some embodiments, the metal substrate is an aluminum substrate.

[0018] In some embodiments, the back plate further comprises an insulating layer, and the insulating layer is disposed between the metal substrate and the circuit layer.

[0019] In some embodiments, the number of the optical elements is a plurality, and the plurality of optical elements comprises a first optical element and a second optical element, the second optical element is disposed on the light-emitting side of the first optical element, and the first optical element and the second optical element are brightness enhancement films.

[0020] In some embodiments, the first optical element further comprises a first prismatic layer comprising a plurality of first prism structures arranged in sequence, the second optical element further comprises a second prismatic layer comprising a plurality of second prism structures arranged in sequence, and the extension direction of the first prism structures intersects with the extension direction of the second prism structures.

[0021] In some embodiments, the plurality of optical elements further comprises a third optical element, and the third optical element is disposed on the light-entering side of the first optical element.

[0022] Embodiments of the present application also provide a display device comprising a backlight module, and the backlight module is the backlight module described above.

[0023] The embodiment of the present application provides an optical element, a backlight module comprising the optical element and a display device. The optical element comprises a base body and a reinforcing structure dispersed in the base body. The reinforcing structure can significantly improve the mechanical strength of the optical element and effectively inhibit the expansion and contraction behavior of the base body under temperature change. Therefore, the mechanical performance of the optical element is greatly enhanced, and the core optical function is ensured not to be affected, and even can be further optimized due to the improvement of the overall flatness. Therefore, the optical element can meet the structural and optical requirements of a large-size and narrow-frame display module without the aid of an external structural backboard. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0025] Figure 1 The structural schematic diagram of the optical element provided by the embodiment of the present application is shown.

[0026] Figure 2 The structural schematic diagram of the brightness enhancement film provided by the embodiment of the present application is shown.

[0027] Figure 3 The first structural schematic diagram of the prism layer provided by the embodiment of the present application is shown.

[0028] Figure 4 The second structural schematic diagram of the prism layer provided by the embodiment of the present application is shown.

[0029] Figure 5 The structural schematic diagram of the diffusion plate provided by the embodiment of the present application is shown.

[0030] Figure 6 The structural schematic diagram of the backlight module provided by the embodiment of the present application is shown.

[0031] Figure 7 The first partial structural schematic diagram of the backlight module provided by the embodiment of the present application is shown.

[0032] Figure 8 The second partial structural schematic diagram of the backlight module provided by the embodiment of the present application is shown.

[0033] Figure 9 The third partial structural schematic diagram of the backlight module provided by the embodiment of the present application is shown.

[0034] Figure 10 The fourth partial structural schematic diagram of the backlight module provided by the embodiment of the present application is shown.

[0035] Figure 11 A fifth partial structure schematic diagram of a backlight module is provided for the embodiment of the present application.

[0036] Figure 12 A structure schematic diagram of a display device is provided for the embodiment of the present application. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person skilled in the art without any creative work fall within the protection scope of the present application.

[0038] The embodiments of the present application provide an optical element, a backlight module and a display device, which can meet the structural and optical requirements of a large-size and narrow-frame display module without the aid of an external structural backboard. The specific description will be given below in combination with the drawings.

[0039] Please refer to Figure 1 , Figure 1 A structure schematic diagram of an optical element is provided for the embodiment of the present application.

[0040] The embodiments of the present application provide an optical element 10, which comprises a base body 11 and a reinforcing structure 12.

[0041] The base body 11 constitutes the main body of the optical element 10, which can be transparent or semi-transparent, and is made of an optical-grade polymer material, such as polycarbonate, polymethyl methacrylate or polystyrene, etc. The main function of the base body 11 is to guide, diffuse or adjust light.

[0042] The reinforcing structure 12 is dispersed in the base body 11. The reinforcing structure 12 can be any structure that can effectively improve the mechanical properties of the base body 11. The action mechanism of the reinforcing structure 12 includes but is not limited to: improving the elastic modulus and bending strength of the base body 11 by bearing and transmitting stress; and / or inhibiting the thermal expansion coefficient of the base body 11 by forming a three-dimensional network or interface barrier effect.

[0043] For example, the reinforcing structure 12 can be a fibrous reinforcing body such as glass fiber, aramid fiber, boron fiber, natural fiber, etc., which forms a skeleton structure in the matrix 11 through high-aspect-ratio fibers, thereby providing excellent tensile and bending resistance to achieve a self-supporting large-size optical element 10; the reinforcing structure 12 can also be a particulate reinforcing body such as silica, alumina, etc. nanoparticles, which can uniformly improve the stiffness, hardness and thermal stability of the matrix 11 while having little effect on optical uniformity; the reinforcing structure 12 can also be a flaky reinforcing body such as graphene, boron nitride, etc., which has a very high specific surface area and two-dimensional structure, can effectively block molecular chain movement, and can significantly improve the modulus, barrier properties and thermal stability of the matrix 11 at a very low addition amount.

[0044] In an optional embodiment, the reinforcing structure 12 is glass fiber, which can be referred to as glass fiber for short. Glass fiber has controllable light transmittance, extremely high tensile strength, good interfacial bonding with commonly used polymer matrix 11, and a mature industrial application foundation, and has the advantages of high rigidity, high dimensional stability and controllable cost.

[0045] In some optional embodiments, please refer to Figure 2 , Figure 2 The structure of the brightness enhancement film provided in the embodiments of the present application is shown in the schematic diagram. The optical element 10 is a brightness enhancement film 13. The brightness enhancement film 13 can also be referred to as a prism film or a brightness enhancement film. The function of the brightness enhancement film 13 is to collect and reorganize light rays emitted at a large angle through the principle of refraction and total reflection, and to converge them into the front viewing angle range of the display, thereby significantly improving the axial brightness and overall display efficiency. The brightness enhancement film 13 further comprises a prism layer 131 disposed on the matrix 11. The prism layer 131 is a microstructure layer precisely designed to achieve the above-mentioned brightness enhancement function. The prism layer 131 is disposed on the light-emitting side surface of the matrix 11. Further, in the present embodiment, the prism layer 131 is directly formed on the matrix 11 reinforced by glass fiber through processes such as precise coating, ultraviolet curing or hot stamping.

[0046] Among them, please refer to Figure 3 and Figure 4 , Figure 3 The first structure of the prism layer provided in the embodiments of the present application is shown in the schematic diagram, Figure 4 The second structure of the prism layer provided in the embodiments of the present application is shown in the schematic diagram. The prism layer 131 comprises a plurality of spaced-apart prism structures 1311 (such as Figure 3 ) or pyramidal structures 1312 (such as Figure 4 ). Further, the prism structures 1311 or the pyramidal structures 1312 can be periodically arranged or non-periodically arranged. For example, Figure 3The prism structure 1311 is a continuous or discontinuous convex stripe with a triangular cross section, and the extending direction is parallel to the length or width direction of the substrate 11. As shown in FIG. 13B, the prism structure 1311 can be a continuous convex stripe with a triangular cross section, and the extending direction is parallel to the length or width direction of the substrate 11. Figure 4 The pyramid structure 1312 can be a microarray of, for example, a quadrangular pyramid, a triangular pyramid, or a cone, which can simultaneously converge and control light in two directions, thereby improving the viewing angle and suppressing the Moiré fringes.

[0047] The functional prism layer 131 prepared on the glass fiber reinforced substrate 11 can also form a composite reinforced optical film, such as a PP (Prism-Prism, double-prism composite film), a DOPP (Diffuser-Prism-Prism, diffuser film and double-prism composite film), and a COPP (Core-Optical-Prism-Prism, core layer-diffuser layer-prism layer 131-prism layer 131 composite film). The glass fibers in the substrate 11 provide stiffness and dimensional stability, effectively preventing sagging, warping, or deformation of large-size films due to self-weight or changes in temperature and humidity during application. For large-size display modules, traditional optical films are prone to optical defects such as water ripples due to insufficient stiffness.

[0048] The embodiment significantly improves the overall stiffness and deformation resistance of the brightness enhancement film 13 through the integrated design of the glass fiber reinforced substrate 11 and the prism layer 131, thereby effectively suppressing the generation of water ripples and ensuring that the light condensing function of the prism layer 131 is not degraded due to film deformation.

[0049] In other optional embodiments, please refer to Figure 5 , Figure 5 The structure of the diffusion plate provided in the embodiment of the present application is shown in the schematic diagram. The optical element 10 is a diffusion plate 14. The main function of the diffusion plate 14 is to convert the point or planar light source from the Mini LED (Mini Light-Emitting Diode, sub-millimeter light-emitting diode) lamp bead into a planar light source with uniform brightness, and eliminate optical defects such as brightness non-uniformity, graininess, or Moiré fringes that may be caused by the arrangement of the lamp beads 30 or the optical structure. The material of the substrate 11 can be an optical-grade polymer, such as PC (Polycarbonate, polycarbonate), PMMA (Polymethyl Methacrylate, polymethyl methacrylate), PS (Polystyrene, polystyrene), or MS (Methyl Methacrylate-Styrene copolymer, methyl methacrylate-styrene copolymer).

[0050] The diffusion plate 14 further comprises diffusion structures 141 disposed in the base 11. The diffusion structures 141 are microscopic scattering units introduced into the interior of the base 11 to achieve light homogenization. The diffusion structures 141 break the directional propagation of light by virtue of the difference in refractive index between them and the material of the base 11, and by virtue of the refraction, reflection and scattering of light, thereby achieving diffusion and homogenization of the light beam.

[0051] The diffusion structures 141 are hollow structures. By hollow structure, it is meant that the interior of the diffusion structures 141 is hollow. The diffusion structures 141 take advantage of the significant difference in refractive index between the air or other gas inside the structure and the polymeric material constituting the walls of the structure, thereby enhancing the light regulation capacity of the individual diffusion structures 141.

[0052] For example, the refractive index of the air inside the hollow structure (approximately 1.0) differs from the refractive index of the polymeric material of the base 11 (typically approximately 1.4 to 1.6). When light is incident on these hollow microbeads, strong refraction, reflection and total internal reflection occur at the gas-solid interface, with a much greater degree of change in the light path than with solid scattering particles. This means that the same or even better diffusion can be achieved with lower amounts of addition, which helps to maintain the high light transmission of the base 11 material, achieving a balance between high brightness and high uniformity.

[0053] At the same time, the hollow structure itself effectively reduces the overall density of the diffusion plate 14, which can significantly reduce the self-weight of the optical element 10, thereby reducing its dependence on the support structure.

[0054] The hollow structure is a spherical or ellipsoidal structure. For example, the hollow structure includes, but is not limited to, hollow glass microbeads, hollow polymer microspheres or hollow ceramic microspheres. This isotropic or approximately isotropic symmetry of the hollow structure is conducive to uniform and soft scattering of light in all directions, avoiding directional scattering or uneven brightness caused by irregular shapes.

[0055] In the present embodiment, a large number of the hollow spherical or ellipsoidal structures described above are pre-dispersed in the optical resin, and then molded into the diffusion plate 14 by extrusion, injection molding or pressure casting processes. These hollow microbeads, as functional diffusion structures 141, are dispersed in the base 11 together with glass fibers that play a reinforcing role.

[0056] In the embodiments of the present application, the glass fibers provide the main bending and tensile strength, building the mechanical skeleton; and the rigid hollow microbeads can effectively inhibit the flow and shrinkage of the matrix resin 11, together controlling the thermal expansion coefficient of the diffusion plate 14 to be below 30 ppm / °C. This feature ensures the dimensional stability of the large-size diffusion plate 14 when the temperature changes, and prevents the problems of stress concentration, warping or even supporting the frame due to thermal expansion and contraction in the narrow frame or seamless structure, fundamentally meeting the requirements of the narrow frame / no frame large-size module for the core optical components.

[0057] The above embodiments respectively elaborate on the optical element 10 being the brightness enhancement film 13 or the diffusion plate 14. In addition to this, the optical element 10 can also be any one or a combination of a light guide plate, a reflective film or a quantum dot film. All these optical elements 10 are based on the core point of the present application: improving the mechanical properties and dimensional stability by the built-in reinforcing structure 12, thereby supporting the ultra-thin, narrow frame display module architecture of the structureless back plate 20.

[0058] Specifically, when the optical element 10 is a light guide plate, the matrix 11 of the light guide plate can also use a polymer such as high-transmittance PMMA or PC that is reinforced by the reinforcing structure 12. The addition of the reinforcing structure 12 can improve the bending strength and creep resistance of the light guide plate, preventing the large-size light guide plate from collapsing and deforming due to its own weight without the support of the external back plate 20. In addition, the glass fiber-reinforced light guide plate can ensure its own flatness, thereby ensuring the stability of the internal total reflection and scattering path of light, achieving excellent light uniformity.

[0059] When the optical element 10 is a reflective film, the matrix 11 thereof is a polymer film, which can be PET (Polyethylene Terephthalate), and the surface of the film is coated or compounded with a high-reflectivity coating layer, which can be a resin layer containing white reflective particles such as titanium dioxide. The reinforcing structure 12 provides excellent stiffness and dimensional stability to the reflective film, making it less likely to curl, wrinkle or relax in large-size applications. This self-supporting feature allows it to be laid flat on a circuit board or module bottom, i.e., to maintain an ideal shape, ensure the stability of the reflection efficiency, and provide bottom structure support for the entire optical stack.

[0060] When the optical element 10 is a quantum dot film, the quantum dot film adopts the reinforcing structure 12 and the quantum dot material are dispersed in the matrix 11. The reinforcing structure 12 not only significantly improves the mechanical strength of the quantum dot film, prevents it from being damaged due to bending and stretching during processing and installation, but also has low thermal expansion characteristics, which helps to maintain the stability of the packaging structure, reduces the potential damage to the quantum dot material and its barrier layer caused by stress due to temperature cycling, and prolongs the service life of the device. The film material with high stiffness is also easier to accurately position and fit in the module without the back plate 20.

[0061] Please refer to Figure 6 , Figure 6 The structural schematic diagram of the backlight module provided by the embodiment of the present application is shown.

[0062] The embodiment of the present application also provides a backlight module 100, which comprises the optical element 10 described in the above embodiments. In the present application, the backlight module 100 refers to a direct type backlight system without an independent structure back plate 20, which realizes the stability of the overall structure through the mutual support of the internal components with high rigidity and low thermal expansion coefficient.

[0063] The backlight module 100 also comprises a back plate 20 and a lamp bead 30, and the lamp bead 30 is arranged on the back plate 20.

[0064] In the present application, the back plate 20 is not a thick metal back plate 20 that plays a main structural supporting role in the traditional sense, but refers to a metal-based printed circuit board, which simultaneously undertakes the functions of bearing circuits, fixing lamp beads 30, efficiently dissipating heat and providing basic rigidity for the entire module. As can be seen, the metal-based printed circuit board replaces the traditional thick and independent back plate that only plays a structural supporting role, and realizes the simplified design of the structureless back plate.

[0065] The lamp bead 30 can be a MiniLED chip, which is accurately arranged on the circuit layer 40 of the back plate 20 by surface mounting technology, and constitutes a direct type light source.

[0066] The optical element 10 is arranged on the light emitting side of the lamp bead 30, the back plate 20 comprises a metal substrate and a circuit layer 40, the circuit layer 40 is arranged on the metal substrate, and the circuit layer 40 is electrically connected with the lamp bead 30.

[0067] The present application creatively combines the traditional structural back plate 20 and the lamp plate function into one. The metal substrate itself has sufficient rigidity and flatness, and can replace the traditional thick independent structural back plate 20, and directly serve as the main load-bearing component of the entire backlight module 100. This is the core of realizing the design of the independent structure back plate 20, which directly leads to a significant reduction in the thickness and weight of the module.

[0068] The circuit layer 40 refers to a circuit pattern formed by etching a copper foil on the insulating layer 50, used to provide electrical connection and driving signals for the Mini LED lamp beads.

[0069] The metal substrate is an aluminum substrate. Aluminum metal has excellent thermal conductivity, high rigidity, low thermal expansion coefficient, and controllable cost. Alternatively, the metal substrate is a flexible aluminum substrate.

[0070] The large amount of heat generated by the Mini LED during operation can be quickly absorbed and evenly spread by the aluminum substrate under the circuit layer 40 and the high thermal conductivity insulating layer 50. The high thermal conductivity of aluminum effectively reduces the junction temperature of the lamp beads 30, ensuring the service life and light output stability of the lamp beads 30, and preventing light decay and color drift caused by high temperature.

[0071] The thermal expansion coefficient of aluminum metal (about 23 ppm / ℃) matches the glass fiber reinforced optical element 10 (thermal expansion coefficient < 30 ppm / ℃). This globally low and matched thermal expansion characteristic ensures that the entire backlight module 100 deforms consistently in a temperature changing environment, avoiding internal stress caused by uneven expansion and contraction between different materials, thereby preventing warping of the optical element 10, stress fracture of the lamp bead 30 welding point, and long-term reliability problems.

[0072] Please refer to Figure 7 , Figure 7 The first partial structure diagram of the backlight module provided by the embodiment of the present application. The back plate 20 further comprises an insulating layer 50, which is arranged between the metal substrate, i.e. the back plate 20 and the circuit layer 40. The insulating layer 50 can be a polymer thin layer filled with a heat-conducting medium, arranged between the metal substrate and the circuit layer 40. The heat-conducting medium can be ceramic powder. The core function of the insulating layer 50 is to achieve electrical isolation to prevent short circuit between the circuit and the metal substrate, while ensuring that heat can be efficiently conducted from the circuit layer 40 and the lamp beads 30 to the metal substrate.

[0073] The assembly method of the backlight module 100 is as follows: the metal substrate serves as a structural base, and the insulating layer 50 and the circuit layer 40 are sequentially arranged above the metal substrate, and the lamp beads 30 are fixed on the circuit layer 40 through the SMT (Surface Mount Technology, surface mounting technology) process. Subsequently, the glass fiber reinforced diffusion plate 14 and other optical elements 10 described in the foregoing embodiments are arranged on the light emitting side of the lamp beads 30 through a supporting frame or direct bonding.

[0074] In one setting scenario of the present application, the number of optical elements 10 in the backlight module 100 is multiple, and the multiple optical elements 10 are stacked in a specific order to form an optical regulation system.

[0075] Please refer to Figure 8 , Figure 8 A second partial structure diagram of the backlight module provided in the embodiment of the present application.

[0076] In the embodiment of the present application, a stacked combination composite film is provided. The number of the optical elements 10 is multiple, and the multiple optical elements 10 include a first optical element 10A and a second optical element 10B arranged on the light exit side of the first optical element 10A. Both the first optical element 10A and the second optical element 10B are brightness enhancement films 13. The first optical element 10A and the second optical element 10B are responsible for collecting and converging the light rays after preliminary homogenization, so as to greatly improve the axial brightness.

[0077] Please refer to Figure 9 , Figure 9 A third partial structure diagram of the backlight module provided in the embodiment of the present application. The first optical element 10A further includes a first prism layer 131A including multiple first prism structures 1311A arranged in sequence, and the second optical element 10B further includes a second prism layer 131B including multiple second prism structures 1311B arranged in sequence. Both the first prism layer 131A and the second prism layer 131B include multiple micro prism structures 1311 arranged at a specific interval (for example, 50 μm to 200 μm). The cross section of the prism structure 1311 is generally triangular.

[0078] The extension direction of the first prism structure 1311A intersects with the extension direction of the second prism structure 1311B. Optionally, the extension directions of the two are perpendicular to each other, that is, at a 90-degree angle.

[0079] By arranging the brightness enhancement film 13 with the extension directions of the two prism structures 1311 perpendicular (intersecting) to each other, a bidirectional light collection system is formed. The first prism layer 131A is responsible for controlling the light rays in the first direction, and the second prism layer 131B is responsible for controlling the light rays in the second direction. The two work together to collect and utilize the large-angle scattered light in each direction, so as to achieve maximum brightness gain in the normal direction of the front of the display, and the optical efficiency is significantly higher than that of using a single prism film.

[0080] Through the stacking of the first optical element 10A and the second optical element 10B, a PP composite film is formed.

[0081] Please continue to refer to Figure 9 and Figure 10 , Figure 10A fourth partial structure diagram of the backlight module provided by the embodiment of the present application is shown. In the PP composite film, the backlight module 100 further comprises a diffusion film 60, which is arranged on the light-out side of the second optical element 10B, and further forms a DOPP composite film. In the present application, the DOPP film specifically refers to the multifunctional composite film formed by further integrating the diffusion film 60 on the light-out side of the PP composite film.

[0082] The composite film reduces the air interface between the films. This not only reduces the light loss caused by multiple interface reflections, improves the optical efficiency, but also avoids the appearance defects such as bright spots and dark spots caused by dust falling into the interface during assembly, and improves the product yield.

[0083] When the composite film structure adopts the reinforcing structure 12 as described above, the whole has higher stiffness and dimensional stability. Such a high-rigidity integrated optical assembly can better maintain its own form without the support of the traditional heavy metal backboard 20.

[0084] Among them, please refer to Figure 11 , Figure 11 A fifth partial structure diagram of the backlight module provided by the embodiment of the present application is shown. The plurality of optical elements 10 further comprises a third optical element 10C, which is arranged on the light-in side of the first optical element 10A, and the third optical element 10C is a diffusion plate 14. That is, the first optical element 10A and the second optical element 10B are arranged on the light-out side of the diffusion plate 14 in turn, and can collect and converge the light rays after preliminary homogenization, so as to greatly improve the axial brightness.

[0085] Please refer to Figure 12 , Figure 12 A structure diagram of a display device provided by the embodiment of the present application is shown.

[0086] The embodiment of the present application further provides a display device 1, which can refer to a terminal display product taking the backlight module 100 as a light source, which covers but is not limited to liquid crystal televisions, commercial displays, digital signs, interactive whiteboards and other large-size display devices.

[0087] The display device 1 comprises the backlight module 100, which is the backlight module 100 described in the above embodiment, and the core is that the optical element 10 adopting the reinforcing structure 12 is combined with the metal substrate lamp plate, so that the traditional independent structure backboard 20 is omitted.

[0088] The display device 1 further comprises a liquid crystal panel 200 arranged at the light emitting side of the backlight module 100, for receiving the uniform surface light source and modulating to generate an image. The liquid crystal panel 200 comprises a TFT (Thin-Film Transistor) array substrate, a CF (Color Filter) color film substrate, and a liquid crystal layer sealed between the two.

[0089] The display device 1 further comprises a frame 300 surrounding the periphery of the backlight module 100 and the liquid crystal panel 200, for integrating and fixing the two, and providing structural support.

[0090] The display device 1 can further comprise a power supply, a signal driving board, a housing and the like, to jointly constitute a complete display device.

[0091] The display device 1 provided by the embodiments of the present application can achieve the following effects.

[0092] The display device 1 can realize the ultra-thin and light-weight of the whole machine. Since the backlight module 100 omits the independent metal structure back plate 20, the overall thickness of the display device 1 is greatly compressed, realizing the extreme thin industrial design. At the same time, the overall weight is significantly reduced, facilitating transportation, installation and wall hanging use.

[0093] The display device 1 can realize the appearance design of ultra-narrow frame and high screen occupation. The backlight module 100 does not need to rely on the wide folding back plate 20 for fixation, so that the front frame design of the display device 1 can be narrowed, easily realizing the advanced appearance of micro-frame or visual frameless, greatly improving the visual immersion.

[0094] The display device 1 can enhance the structural reliability and display consistency of the whole machine. The backlight module 100 adopts the enhanced optical element 10 and the metal substrate to jointly constitute a backlight module 100 with high rigidity and low thermal expansion coefficient, which can effectively prevent the warping and deformation of large-size screens caused by self-weight or temperature change, ensure the constant distance between the liquid crystal panel 200 and the optical element 10, thereby eliminating the optical defects such as water ripples and dark spots, and ensuring the picture uniformity and product reliability under long-term use.

[0095] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0096] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features.

[0097] The optical element, the backlight module and the display device provided by the embodiments of the present application are described in detail above. The principles and implementation manners of the present application are described by applying specific examples in this paper, and the above description of the embodiments is only used to help understand the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed, and the above description of the present application should not be understood as a limitation.

Claims

1. An optical element, characterized in that, include: Matrix; A reinforcing structure, wherein the reinforcing structure is dispersed in the matrix.

2. The optical element according to claim 1, characterized in that, The reinforcing structure is a fibrous reinforcement.

3. The optical element according to claim 2, characterized in that, The fibrous reinforcement is glass fiber.

4. The optical element according to any one of claims 1 to 3, characterized in that, The optical element is a brightness enhancement film, and the brightness enhancement film further includes a prism layer disposed on the substrate.

5. The optical element according to claim 4, characterized in that, The prism layer includes multiple spaced-apart prism structures or pyramidal structures.

6. The optical element according to any one of claims 1 to 3, characterized in that, The optical element is a diffuser plate, and the diffuser plate further includes a diffuser structure disposed in the substrate.

7. The optical element according to claim 6, characterized in that, The diffusion structure is a hollow structure.

8. The optical element according to claim 7, characterized in that, The hollow structure is either spherical or ellipsoidal.

9. A backlight module, characterized in that, Includes the optical element as described in any one of claims 1 to 8.

10. The backlight module according to claim 9, characterized in that, It also includes a backplate and LEDs, with the LEDs disposed on the backplate; the optical element is disposed on the light-emitting side of the LEDs, and the backplate includes a metal substrate and a circuit layer, with the circuit layer disposed on the metal substrate and electrically connected to the LEDs.

11. The backlight module according to claim 10, characterized in that, The metal substrate is an aluminum substrate.

12. The backlight module according to claim 10, characterized in that, The backplane also includes an insulating layer disposed between the metal substrate and the circuit layer.

13. The backlight module according to claim 9, characterized in that, The number of optical elements is multiple, including a first optical element and a second optical element. The second optical element is disposed on the light-emitting side of the first optical element, and the first optical element and the second optical element are brightness enhancement films.

14. The backlight module according to claim 13, characterized in that, The first optical element further includes a first prism layer, which includes a plurality of sequentially arranged first prism structures. The second optical element further includes a second prism layer, which includes a plurality of sequentially arranged second prism structures. The extension directions of the first prism structures intersect with the extension directions of the second prism structures.

15. The backlight module according to claim 13, characterized in that, The plurality of optical elements also includes a third optical element, which is disposed on the light-incident side of the first optical element and is a diffuser plate.

16. A display device, characterized in that, Includes a backlight module, wherein the backlight module is the backlight module according to any one of claims 9 to 15.

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