Fixing frame, backlight module and display device

Abstract

The utility model provides a fixing frame, a backlight module and a display device, the fixing frame comprises a frame, the frame comprises a first supporting part and a second supporting part which are connected with each other, the first supporting part is provided with a first bearing surface, and the first bearing surface is used for bearing a diaphragm assembly; the second supporting part is connected to the first bearing surface of the first supporting part; the first supporting part is further provided with a first inclined face, the first inclined face faces the inner side of the frame, the first inclined face is connected with the first bearing face, and the first inclined face inclines towards the direction close to the inner side of the frame from the first bearing face. And the first reflecting layer is arranged on the first inclined surface. The fixing frame can improve the display quality and stability of the display device.

Description

TECHNICAL FIELD

[0001] The utility model relates to display technical field especially, relate to a fixed rack, backlight unit and display device. BACKGROUND

[0002] In the display technology and related fields, the fixing of liquid crystal assembly and the stability of diaphragm are the key factors to ensure display quality. Especially under the design trend of pursuing higher screen ratio and narrower frame, the fixing of liquid crystal assembly and the stability of diaphragm are facing unprecedented challenges.

[0003] In the narrow frame display device, due to the limitation of space, the structure of the glue frame at least partially extends from the non-display area of the display panel to the display area to fix and support the internal structure such as the diaphragm assembly. However, this design also brings a significant problem: the glue frame itself will block part of the backlight, and if not handled properly, it is easy to form a shadow on the display picture, affecting the visual experience.

[0004] It can be understood that when the light is emitted from the backlight module and tries to pass through the diaphragm assembly and the liquid crystal assembly to form an image, if it encounters the glue frame, part of the light will be absorbed instead of penetrating, resulting in insufficient light at the edge or a specific position of the display area, forming a shadow. This shadow not only reduces the overall brightness of the picture, but also may cause color distortion, seriously affecting the user's viewing experience. SUMMARY

[0005] The embodiments of the present application provide a fixed rack, a backlight module and a display device, which can improve the display quality and stability of the display device.

[0006] The embodiments of the present application provide a fixed rack, comprising:

[0007] A frame, the frame comprising a first support part and a second support part connected to each other, the first support part having a first supporting surface for supporting a diaphragm assembly; the second support part being connected to the first supporting surface of the first support part;

[0008] The first support part further has a first inclined surface, the first inclined surface facing the inner side of the frame, the first inclined surface being connected to the first supporting surface, and the first inclined surface being inclined from the first supporting surface towards the inner side of the frame;

[0009] A first reflective layer is arranged on the first inclined surface.

[0010] In some embodiments, the first reflective layer is an ink layer or a plastic layer.

[0011] In some embodiments, the first reflective layer comprises a grating structure and / or a metasurface structure.

[0012] In some embodiments, the first inclined surface is curved or folded.

[0013] In some embodiments, when the first inclined surface is curved, the first inclined surface is a circular arc surface.

[0014] In some embodiments, the fixing frame comprises a rib position, which is arranged on and protrudes from the first supporting surface.

[0015] In some embodiments, the number of rib positions is at least two, and the rib positions are distributed at intervals.

[0016] In some embodiments, in the direction in which the first supporting portion points to the second supporting portion, the cross-sectional area of the rib position gradually decreases.

[0017] In some embodiments, the rib position comprises a dot-shaped rib position or a long strip-shaped rib position.

[0018] In some embodiments, when the rib position is long strip-shaped, the extension direction of the rib position is perpendicular to the edge of the first supporting surface close to the inner side of the frame.

[0019] Embodiments of the present application also provide a backlight module, comprising:

[0020] a fixing frame, which is the fixing frame described above;

[0021] a diaphragm assembly, which is arranged on the inner side of the frame and overlaps the first supporting surface.

[0022] Embodiments of the present application also provide a display device, comprising:

[0023] a backlight module, which is the backlight module described above;

[0024] a liquid crystal module, which is arranged opposite to the backlight module and connected to the frame.

[0025] The fixed frame, backlight module and display device provided by the embodiment of the present application, the frame is composed of a first support part and a second support part, the first support part is used for supporting the diaphragm assembly, and the second support part is used for supporting the liquid crystal module. The liquid crystal module and the diaphragm assembly adopt a layered layout mode in the embodiment, which can provide sufficient fixing area for the liquid crystal module under the premise of ensuring that the diaphragm expansion / contraction space is not affected. The first support part is provided with a first inclined surface, the first inclined surface faces the inner side of the frame, and a first reflection layer is arranged on the first inclined surface. The arrangement of the reflection layer can further improve the utilization efficiency of light, effectively reflects light to the edge of the display area, thereby effectively avoiding the occurrence of the shadow problem and improving the visual effect of the display device. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a structural schematic diagram of a display device in the prior art.

[0027] Figure 2 FIG. 2 is a first structural schematic diagram of a fixed frame provided by the embodiment of the present application.

[0028] Figure 3 FIG. 3 is a first structural schematic diagram of a frame provided by the embodiment of the present application.

[0029] Figure 4 FIG. 4 is a second structural schematic diagram of a frame provided by the embodiment of the present application.

[0030] Figure 5 FIG. 5 is a third structural schematic diagram of a frame provided by the embodiment of the present application.

[0031] Figure 6 FIG. 6 is a fourth structural schematic diagram of a frame provided by the embodiment of the present application.

[0032] Figure 7 FIG. 7 is a fifth structural schematic diagram of a frame provided by the embodiment of the present application.

[0033] Figure 8 FIG. 8 is a sixth structural schematic diagram of a frame provided by the embodiment of the present application.

[0034] Figure 9 FIG. 9 is a seventh structural schematic diagram of a frame provided by the embodiment of the present application.

[0035] Figure 10 FIG. 10 is an eighth structural schematic diagram of a frame provided by the embodiment of the present application.

[0036] Figure 11 FIG. 11 is a ninth structural schematic diagram of a frame provided by the embodiment of the present application.

[0037] Figure 12 FIG. 12 is a second structural schematic diagram of a fixed frame provided by the embodiment of the present application.

[0038] Figure 13 This is a schematic diagram of a third structure of the fixing frame provided in an embodiment of this application.

[0039] Figure 14 This is a schematic diagram of the structure of the filler provided in the embodiments of this application.

[0040] Figure 15 This is a schematic diagram of a fourth structure of the fixing frame provided in an embodiment of this application.

[0041] Figure 16 This is a schematic diagram of the fifth structure of the fixing frame provided in the embodiments of this application.

[0042] Figure 17 This is a tenth structural diagram of the framework provided in the embodiments of this application.

[0043] Figure 18 This is a schematic diagram of the backlight module provided in an embodiment of this application.

[0044] Figure 19 This is a schematic diagram of a first structure of a display device provided in an embodiment of this application.

[0045] Figure 20 This is a schematic diagram of a second structure of the display device provided in an embodiment of this application. Detailed Implementation

[0046] 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.

[0047] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a display device in the prior art.

[0048] In display technology and related fields, the fixation of the liquid crystal component 17 and the stability of the film 14 are key factors in ensuring the display quality of the display device 400. Especially with the design trend of display devices 400 pursuing higher screen-to-body ratios and narrower bezels, the fixation of the liquid crystal component 17 and the stability of the film 14 face unprecedented challenges.

[0049] To ensure that the film 14 does not develop visual defects such as water ripples due to stress concentration when the temperature changes, the frame 12 needs to be designed to allow sufficient space for the expansion and contraction of the film 14. This space requirement is usually met by adjusting the size of the BM (Black Matrix) area of ​​the liquid crystal module 17.

[0050] However, the fixing of the liquid crystal assembly 17 requires sufficient adhesive area to ensure stability and reliability. The use of adhesives such as double-sided tape 19 relies on the adhesive area to provide sufficient adhesion to prevent the liquid crystal assembly 17 from falling off during long-term use or under external force.

[0051] In a conventional design, the space required for the expansion / contraction of the membrane 14 and the adhesive area required for the fixing of the liquid crystal assembly 17 jointly occupy the portion of the BM area of the glue frame 12. As the design of the display device 400 develops towards a narrower frame, the size of the portion of the BM area of the glue frame 12 is continuously reduced, which leads to a direct conflict between the two requirements. When the size of the portion of the BM area of the glue frame 12 is insufficient to meet the space requirement for the expansion / contraction of the membrane 14 and the adhesive area requirement for the fixing of the liquid crystal assembly 17 at the same time, the liquid crystal assembly 17 may fall off due to insufficient adhesion, resulting in device failure or damage; or if the space for the expansion / contraction of the membrane 14 is reduced in order to increase the adhesive area, the membrane 14 may produce visual defects such as water ripples due to temperature changes, which seriously affects the user experience.

[0052] Therefore, in the display device 400 with a narrow BM area design, how to balance the space requirement for the expansion / contraction of the membrane 14 and the adhesive area requirement for the fixing of the liquid crystal assembly 17 has become a technical problem to be solved.

[0053] The embodiments of the present application provide a fixing frame, a backlight module and a display device, which can provide sufficient fixing area for the liquid crystal module while ensuring the expansion / contraction space of the membrane. The specific description is made below with reference to the drawings.

[0054] Please refer to Figure 2 , Figure 2 The first structure diagram of the fixing frame provided by the embodiments of the present application is shown.

[0055] The fixing frame 1 provided by the embodiments of the present application includes a frame 11, and the material of the frame 11 can be plastic, silica gel or metal.

[0056] The frame 11 surrounds to form an accommodation space 111, i.e. the inner side of the frame 11, for mounting and fixing the internal components of the display device 100, such as the membrane assembly 2.

[0057] The inner surface of the frame 11 is provided with a groove 113, and the groove 113 is in communication with the accommodation space 111. The membrane assembly 2 can be arranged in the accommodation space 111, i.e. the inner side of the frame 11, and overlapped in the groove 113, and the groove 113 provides additional space for the expansion or contraction of the membrane assembly 2. The liquid crystal module 20 can be connected with the end face of the frame 11.

[0058] In other words, the liquid crystal module 20 and the diaphragm assembly 2 are arranged in a layered manner in the embodiment, and are not fixed in the same plane. Through the ingenious use of the layered design, sufficient fixing area is provided for the liquid crystal module 20 while ensuring that the diaphragm expansion / contraction space is not affected, thereby significantly improving the display quality and stability of the overall display device 100.

[0059] Please refer to Figure 3 , Figure 3 The first structure schematic diagram of the framework provided by the embodiment of the present application is shown in FIG. 1. The framework 11 includes a first support part 115 and a second support part 117. The first support part 115 has a first bearing surface 1151. On the framework 11, the first bearing surface 1151 refers to a plane or surface for supporting and fixing the diaphragm assembly 2. The first bearing surface 1151 has a specific shape and size to ensure that the diaphragm assembly 2 can be correctly installed and positioned, i.e., the first bearing surface 1151 can be used to bear the diaphragm assembly 2.

[0060] The second support part 117 is connected to the first bearing surface 1151 of the first support part 115. The first support part 115 and the second support part 117 form a groove 113. The second support part 117 forms a second bearing surface 1171 on the side away from the first support part 115. On the framework 11, the second bearing surface 1171 refers to a plane or surface for supporting and fixing the liquid crystal module 20. Similar to the first bearing surface 1151, the second bearing surface 1171 also has a specific shape and size to ensure that the liquid crystal module 20 can be correctly installed and positioned, i.e., the second bearing surface 1171 can be used to bear the liquid crystal module 20.

[0061] The framework 11 can effectively support and fix the diaphragm assembly 2 and the liquid crystal module 20, so that the diaphragm assembly 2 and the liquid crystal module 20 are arranged in layers. Without affecting the diaphragm assembly 2 expansion / contraction space, sufficient adhesive area is provided for the liquid crystal module 20, thereby significantly improving the display quality and stability of the overall display device 100.

[0062] The area of the connection region of the second support part 117 and the first support part 115 is a first area, and the area of the second bearing surface 1171 is a second area. The first area is smaller than the second area.

[0063] Since the first support part 115 mainly undertakes the task of supporting the membrane assembly 2, the connection area between the first support part 115 and the second support part 117 does not need to be too large, as long as it can meet the needs of stable connection. Therefore, the first area is set to be relatively small, which not only saves material cost, but also avoids unnecessary space occupation, making the structure of the entire frame 11 more compact and efficient. The area of the second supporting surface 1171 is the second area, and the second area is larger than the first area. This is because the second supporting surface 1171 needs to stably support the liquid crystal module 20, a key component, to ensure that it will not be displaced due to vibration or external force. The stability and firmness of the liquid crystal module 20 are crucial to the overall performance of the display device 100, so the design of the second supporting surface 1171 needs to pay more attention to stability and bearing capacity. By increasing the second area, the contact area between the first adhesive and the liquid crystal module 20 can be increased, thereby improving the adhesion and stability of the fixation.

[0064] In the direction of the first support part 115 towards the second support part 117, the cross-sectional area of the second support part 117 gradually increases. As a key component for supporting the liquid crystal module 20, the second support part 117 needs to have good bearing capacity and stability. By gradually increasing the cross-sectional area, the strength and rigidity of the second support part 117 can be effectively increased, so that it can maintain a stable form when facing external forces or vibrations, thereby ensuring the stability of the liquid crystal module 20. At the same time, this design strategy also helps to optimize the internal space utilization of the display device 100. In the context of narrow BM zone design, by gradually increasing the cross-sectional area of the second support part 117, a more stable support surface can be provided for the liquid crystal module 20 without sacrificing the space of other components. This not only improves the overall performance of the display device 100, but also brings users a clearer and more stable display effect. Furthermore, the gradual increase in cross-sectional area not only improves the bearing capacity and stability of the second support part 117, but also makes the frame 11 easier to demold during the preparation process. This reduces production costs and improves production efficiency.

[0065] Further, the first support part 115 and the second support part 117 are integrally formed. Specifically, this design manufactures the first support part 115 and the second support part 117 as a whole through injection molding, extrusion or other appropriate molding processes. This integrated design not only simplifies the manufacturing and assembly process, reduces production cost, but also improves the structural stability and precision of the frame 11, thereby further improving the overall performance and stability of the display device 100.

[0066] Please refer to Figure 4 and Figure 5 , Figure 4 the second structure diagram of the frame provided by the embodiment of the present application, Figure 5A third structural schematic diagram of the framework provided by the embodiments of the present application.

[0067] When the membrane assembly 2 is installed on the framework 11, if the overlapping position of the membrane assembly 2 is located at the boundary area between the display area 200 and the non-display area 300 (i.e. the boundary area between the BM area and the non-BM area), the problem of dull visual effect at the boundary area may be caused.

[0068] To solve the above technical problem, the fixing frame 1 in the embodiments of the present application further comprises a rib position 119, which is arranged on and protrudes from the first supporting surface 1151. The main function of the rib position 119 is to moderately lift the membrane assembly 2, so as to form a gap with a certain height between the membrane assembly 2 and the first supporting surface 1151. The introduction of the gap effectively promotes the penetration of light, significantly expands the area illuminated by light, especially increases the light entering space in the depth range of 0.5 mm and above outside the display area 200, thereby significantly improves the brightness performance of the display area 200 adjacent to the non-display area 300, effectively alleviates the visual dull phenomenon caused by the obstruction of light transmission, and overall improves the display effect.

[0069] The number of rib positions 119 is at least two, and the rib positions 119 are distributed at intervals to ensure stable support for the membrane assembly 2.

[0070] In the direction in which the first supporting part 115 points to the second supporting part 117, the cross-sectional area of the rib position 119 gradually decreases, that is, the contact area of the rib position 119 with the first supporting surface 1151 is greater than the contact area of the rib position 119 with the liquid crystal module 20, which not only improves the reliability of the fixation of the rib position 119 on the framework 11, but also helps to reduce the obstruction of the rib position 119 to the light transmission.

[0071] The rib position 119 comprises a dot-shaped rib position 119 or a long strip-shaped rib position 119. The dot-shaped rib position 119 has a small volume and flexible layout, which minimizes the interference with the light transmission; while the long strip-shaped rib position 119 provides more stable support for the membrane assembly 2 with its continuous form and larger contact area.

[0072] When the rib position 119 is a long strip-shaped rib position 119, the extension direction of the rib position 119 is perpendicular to the edge of the first supporting surface 1151 close to the accommodating space 111, i.e. the inner side of the framework 11. This not only enables the rib position 119 to better resist the lateral pressure from the membrane assembly 2, but also ensures that the propagation direction of light is not hindered, thereby further improving the display effect.

[0073] The extension length of the rib position 119 is equal to the width of the first supporting surface 1151 along the direction perpendicular to the thickness of the frame 11, which not only significantly enhances the overall structural strength of the frame 11 and provides more stable support for the membrane assembly 2, but also effectively avoids the risk of the membrane assembly 2 falling off the rib position 119 during thermal expansion and contraction. Specifically, whether the membrane assembly 2 is in a contracted or expanded state, it can be tightly and uniformly supported by the rib position 119, thereby ensuring the high stability of the membrane assembly 2 during installation and use. This design not only improves the visual quality of the display device 100, but also prolongs its service life, providing users with a more premium display experience.

[0074] When the rib position 119 is a point-like rib position 119, the projection of the rib position 119 on the first supporting surface 1151 is a circle, and / or an ellipse, and / or a polygon. This not only enriches the shape selection of the rib position 119, but also allows for flexible adjustment according to the needs of actual application scenarios, thereby meeting different display effects and performance requirements.

[0075] The height of the rib position 119 in this application is greater than or equal to 0.3 mm. The rib position 119 within this height range can provide sufficient penetration space for light, facilitating the increase of light penetration space within a depth range of 0.5 mm or more outside the display area 200 starting from the junction of the display area 200 and the non-display area 300. This allows light to penetrate more smoothly to the lower side of the membrane assembly 2, reducing light loss during transmission, thereby improving the overall brightness of the display device 100.

[0076] Further, the rib position 119 is a transparent body, which not only retains the original support function of the rib position 119, but also, by using a transparent material, further reduces the obstruction of the rib position 119 to light when penetrating the gap between the membrane assembly 2 and the first supporting surface 1151, thereby improving the overall brightness and clarity of the display area 200. The application of transparent rib position 119 provides a more transparent visual effect for the display device 100, enhancing the user's visual experience.

[0077] The material of the rib position 119 is an elastic material. Elastic materials have excellent flexibility and recovery, which can well adapt to the deformation of the membrane assembly 2 during thermal expansion and contraction, thereby further reducing the friction and wear between the membrane assembly 2 and the rib position 119. Not only that, the rib position 119 with elasticity can also provide cushioning for the membrane assembly 2 and prolong the service life of the display device 100.

[0078] Specifically, the muscle position 119 can be manufactured by plastic processing technologies such as injection molding and extrusion molding. When selecting a specific material, materials with excellent transparency and elasticity such as transparent thermoplastic polyurethane (TPU), transparent silicone, and transparent elastic polyolefin can be considered. These materials not only meet the functional requirements of the muscle position 119, but also have good processing performance and cost-effectiveness, suitable for large-scale production applications.

[0079] The first support part 115 and the second support part 117 in the above embodiment not only bear the basic function of bearing fixation, but also optimize the display effect of the display device 100.

[0080] Please continue to refer to Figure 3 Specifically, the first support part 115 also has a first inclined surface 1153 facing the inner side of the containing space 111, i.e. the frame 11, and the first inclined surface 1153 is connected with the first supporting surface 1151. The first inclined surface 1153 gradually inclines from the first supporting surface 1151 to the direction of the inner side of the containing space 111, i.e. the frame 11, and is designed to cleverly surround the upper part or the periphery of the light-emitting unit and / or the light guide plate and extend outward. This design not only avoids the problem of light shielding, but also realizes the dual functions of light guiding and light leakage prevention through its inclined structure, significantly increases the effective area of light, thereby improving the utilization rate of light and making the brightness distribution of the display device 100 more uniform, improving the user's visual experience.

[0081] Please refer to Figure 6 , Figure 6 The fourth structural schematic diagram of the frame provided by the embodiment of the present application. The first inclined surface 1153 is at least partially arranged in the non-display area 300 to optimize the conduction path of light in the non-display area 300.

[0082] The diaphragm assembly 2 is located in the inner side of the containing space 111, i.e. the frame 11, and overlaps the first supporting surface 1151. This design ensures the stability and position accuracy of the diaphragm assembly 2, providing reliable support for the display device 100.

[0083] Further, the embodiment of the present application increases the light-in space in the depth range of more than 0.5mm on the outer side of the display area 200 below the diaphragm assembly 2, improving the overall brightness of the display device 100.

[0084] The gap between the first inclined surface 1153 and the diaphragm assembly 2 in the embodiment of the present application is set to be greater than 0.3mm, further reducing light loss and improving display brightness.

[0085] Please continue to refer to Figures 6 to 8 , Figure 7 The fifth structural schematic diagram of the frame provided by the embodiment of the present application,Figure 8 The sixth structure diagram of the frame provided by the embodiment of the present application is shown. Regarding the specific shape of the first inclined surface 1153, the embodiment of the present application provides two optional solutions: a curved surface (such as Figure 6 and Figure 7 ) or a folded surface (such as Figure 8 ).

[0086] Please continue to refer to Figure 3 The second support part 117 also has a second inclined surface 1172, which is directed towards the inner side of the containing space 111, i.e. the frame 11. The second inclined surface 1172 is connected with the second bearing surface 1171 and is inclined from the second bearing surface 1171 towards the direction away from the inner side of the containing space 111, i.e. the frame 11. The second inclined surface 1172 provides smoother and more convenient guidance during the installation of the diaphragm assembly 2.

[0087] Further, please refer to Figure 9 , Figure 9 The seventh structure diagram of the frame provided by the embodiment of the present application is shown. The second support part 117 includes a sub-connection part 1173 and a sub-support part 1174. The sub-connection part 1173 is connected with the first support part 115 and extends along the thickness direction of the frame 11. The sub-support part 1174 is connected with the side of the sub-connection part 1173 away from the first support part 115. The side of the sub-support part 1174 away from the sub-connection part 1173 is the second bearing surface 1171, and the side of the sub-support part 1174 close to the inner side of the containing space 111, i.e. the frame 11, is the second inclined surface 1172.

[0088] The sub-connection part 1173 is closely connected with the first bearing surface 1151 of the first support part 115. This connection mode ensures the stability between the two, thereby ensuring the stability of the frame 11 under various conditions.

[0089] In the prior art, the frame 11 is often designed to extend partially or entirely to the effective display area 200 domain (i.e. the junction area of the BM area and the non-BM area) of the display panel, in order to fix and support the internal structure such as the diaphragm assembly 2. However, this design causes the frame 11 to block the backlight, which is extremely easy to form a dark shadow on the display picture, affecting the visual quality.

[0090] To solve the above problems, the embodiment of the present application proposes a fixing frame 1 which includes a reflective layer. The reflective layer is ingeniously arranged on the inner surface of the frame 11, which is located close to the edge of the display area 200 domain, and can fully utilize the space advantage of the frame 11 to reflect the originally blocked light to the edge of the display area 200 or the diaphragm assembly 2. This design not only effectively reduces the situation of light absorption, but also significantly improves the utilization rate of light, making the light distribution of the display area 200 domain more uniform and the picture brightness more consistent.

[0091] By introducing the reflective layer, the embodiments of the present application not only solve the problem of dark shadow, but also further improve the optical performance of the display device 100. The design of the reflective layer can be flexibly adjusted according to the specific application scene, such as adjusting the material, thickness, shape and other parameters of the reflective layer to optimize the light reflection effect and achieve the best optical performance.

[0092] In some cases, please refer to Figure 10 , Figure 10 The eighth structural schematic diagram of the framework provided by the embodiments of the present application. The fixed frame 1 further comprises a first reflective layer 13, which is arranged on the first inclined surface 1153. The first inclined surface 1153 itself has helped to optimize the light conduction path, and the addition of the first reflective layer 13 further improves the utilization efficiency of light, which can reflect light to the edge of the display area 200 domain, avoiding the occurrence of dark shadow problem.

[0093] The combination mode of the first reflective layer 13 and the first inclined surface 1153 is flexible and various, which can be directly attached to the first inclined surface 1153, or can realize the reflection function through other technical means. In terms of material selection, the first reflective layer 13 can be an ink layer, a plastic layer or an aluminum layer, etc. Each material has its own unique advantages.

[0094] When the first reflective layer 13 is an ink layer, the ink layer has the advantages of low cost and simple processing, and by adjusting the ink formula, the reflection rate of light can be accurately controlled. The ink layer material can be reactive ink, water-based ink, ultraviolet curing ink, thermal transfer ink, metal ink, fluorescent ink, etc.

[0095] Specifically, by the high-precision printing ability of silk screen printing or pad printing, the ink containing high reflectivity characteristics is uniformly and firmly attached to the first inclined surface 1153 of the frame 11. This step not only significantly improves the reflectivity of the first inclined surface 1153, but also ensures the efficient use of light in the process of penetration or reflection, thereby effectively reducing the dark shadow phenomenon caused by the shielding of the frame 11.

[0096] Compared with direct injection molding or aluminum drawing process, the silk screen printing / pad printing scheme of the present application has higher flexibility and accuracy. High-reflectivity ink is applied on the first inclined surface 1153 without changing the material or process of the entire fixed frame 1. This not only reduces the production cost, but also improves the production efficiency, making the preparation of the fixed frame 1 more economical and efficient.

[0097] Please refer to Figure 11 , Figure 11The ninth structure diagram of the framework provided by the embodiments of the present application is shown. When the first reflective layer 13 is a plastic layer, the plastic layer has higher flexibility and plasticity, and the thickness, shape and surface texture of the reflective layer can be adjusted according to specific requirements to achieve the best optical effect. The material of the plastic layer can be polycarbonate (PC), polyethylene terephthalate (PET), polyvinyl chloride (PVC) or polymethyl methacrylate (PMMA) and other high-reflectivity plastic materials, and can also be a composite material such as a reflective microsphere composite material.

[0098] The present application provides two process methods for setting the first reflective layer 13 on the first inclined surface 1153 of the framework 11: a secondary injection molding scheme and a double-material co-extrusion scheme.

[0099] The secondary injection molding scheme is specifically: the scheme splits the fixed frame 1 into two independent parts and uses two injection molding processes to form them respectively. In the first injection molding process, ordinary materials are selected as injection molding raw materials, and the basic structure of the framework 11 is formed, such as the first support part 115 and the second support part 117, through a standard injection molding process, to ensure that the product can meet the basic stress requirements and provide stable support for subsequent assembly and use. In the second injection molding process, special materials with high reflectivity characteristics are used. The key to this step is to accurately inject high-reflectivity materials into the part of the framework 11 that is directly related to optical reflection, thereby significantly improving the reflectivity of this area to meet the high requirements of the product on optical performance.

[0100] The double-material co-extrusion scheme is specifically: the scheme uses an extrusion process to achieve the composite molding of the fixed frame 1 through a double-material co-extrusion method. The first material, with excellent mechanical properties and cost-effectiveness, is used to form the basic stress part of the framework 11, such as the first support part 115 and the second support part 117. This part of the material ensures the structural stability and durability of the framework 11, meeting the basic needs of the product in daily use. The second material has unique optical performance and reflection characteristics and is specially used to form the first reflective layer 13. By accurately controlling the extrusion process parameters, the high-reflectivity material is uniformly distributed in the specified area (on the first inclined surface 1153) of the framework 11, thereby significantly improving the light reflection effect of this area and meeting the high requirements of the product on optical performance. Through the double-material co-extrusion scheme, not only is the dual optimization of the framework 11 in structure and performance achieved, but also the production efficiency and material utilization are improved.

[0101] In addition, the first reflective layer 13 can also include a grating structure and / or a metasurface structure. As an optical element of a periodic structure, the grating structure can achieve diffraction and interference of light, precisely control the propagation direction and intensity of light. The metasurface structure is composed of sub-wavelength structure units and has powerful light manipulation ability, which can flexibly control the phase, polarization and amplitude of light. Integrating the grating structure and / or the metasurface structure into the first reflective layer 13 not only significantly improves the light reflectivity, but also precisely controls the light propagation path, effectively reduces the shadow phenomenon, and can adjust the light distribution according to the specific application scenario, improving the overall brightness and uniformity of the display picture.

[0102] In other cases, please refer to Figure 12 , Figure 12 The second structure diagram of the fixing frame provided by the embodiment of the present application is shown. The fixing frame 1 also includes a second reflective layer 15, which is arranged on the second inclined surface 1172. The second reflective layer 15 can reflect light, which can effectively reflect the light that may be directly absorbed or blocked by the frame 11, and guide these light back into the diaphragm assembly 2.

[0103] The material selection of the second reflective layer 15 is also flexible and diverse, which can be an ink layer, a plastic layer or an aluminum layer. In view of the material irregularity or thermal expansion phenomenon that the diaphragm assembly 2 may encounter, the frame 11 in the embodiment of the present application is ingeniously provided with a relief hole on the second support part 117. The axial direction of the relief hole is perpendicular to the thickness direction of the frame 11, which provides a sufficient tolerance space for the diaphragm assembly 2 to adapt to the possible outward extension or slight deformation under certain conditions.

[0104] Further, the relief hole is arranged on the sub-support part 1174 to avoid interference with the diaphragm assembly 2 or other parts of the frame 11. The axial direction of the relief hole is perpendicular to the thickness direction of the frame 11 to ensure that the filler 16 is not hindered during installation.

[0105] In some cases, during the manufacturing process of the liquid crystal display module, the diaphragm assembly 2 needs to be accurately installed on the frame 11 in the order from top to bottom. However, due to the possible local irregularities of the optical diaphragm assembly 2, such as uneven thickness, shape deviation, etc., direct installation may cause interference between the diaphragm assembly 2 and the frame 11, affecting the optical performance and structural stability of the display module.

[0106] Therefore, please refer to Figure 13 , Figure 13The third structure diagram of the fixing frame provided by the embodiment of the present application. The fixing frame 1 provided by the embodiment of the present application is provided with a notch 1175 on the second support part 117, and the fixing frame 1 further comprises a filling piece 16, which is arranged at the notch 1175, and the filling piece 16 is provided with a relief hole, and the axial direction of the relief hole is perpendicular to the thickness direction of the frame 11.

[0107] The notch 1175 is prearranged on the frame 11, and the shape and size of the notch 1175 are customized according to the irregular area of the diaphragm assembly 2, so as to ensure that the diaphragm assembly 2 can be smoothly and accurately stacked from top to bottom into the frame 11, while avoiding interference with the irregular area. After the diaphragm assembly 2 is successfully installed on the frame 11, in order to restore the integrity of the frame 11 and enhance the structural stability, the embodiment of the present application further introduces the filling piece 16. The shape and size of the filling piece 16 correspond to the notch 1175 of the frame 11. During the filling process, the filling piece 16 can be accurately placed in the notch 1175, and it is tightly connected with the frame 11 by using appropriate fixing methods (such as adhesion, buckling, etc.).

[0108] Please refer to Figure 14 , Figure 14 The structure diagram of the filling piece provided by the embodiment of the present application. The filling piece 16 comprises a first filling part 161 and a second filling part 162 connected with each other, the first filling part 161 extends along the thickness direction of the frame 11, the second filling part 162 extends along the direction perpendicular to the thickness direction of the frame 11, the first filling part 161 is connected with the first support part 115, and the second filling part 162 is arranged opposite to the first bearing surface 1151.

[0109] The first filling part 161 extends along the thickness direction of the frame 11, and its main function is to serve as the main connecting structure between the filling piece 16 and the frame 11. The second filling part 162 extends along the direction perpendicular to the thickness direction of the frame 11, and its design purpose is to provide additional support and positioning function for the diaphragm assembly 2.

[0110] In order to further improve the reflection efficiency, please refer to Figure 14 and Figure 15 , Figure 14 The structure diagram of the filling piece provided by the embodiment of the present application, Figure 15 The fourth structure diagram of the fixing frame provided by the embodiment of the present application. The fixing frame 1 further comprises a third reflection layer 18, which is arranged on the side of the second filling part 162 close to the first bearing surface 1151, and the third reflection layer 18 can reflect the light transmitted from the diaphragm assembly 2, so as to improve the optical performance of the display module.

[0111] In some cases, the second filling part 162 is leveled with the second inclined surface 1172 on the side close to the first supporting surface 1151, ensuring smooth contact surface between the filling part 16 and the film assembly 2, avoiding optical interference.

[0112] The second filling part 162 is leveled with the second supporting surface 1171 on the side away from the first supporting surface 1151, which is beneficial to the connection reliability of the liquid crystal module 20.

[0113] Please continue to refer to Figure 13 and Figure 16 , Figure 16 The fifth structure diagram of the fixing frame provided by the embodiment of the present application. The present application has two specific cases for the filling part 16. The filling part 16 includes plastic material (such as Figure 13 ) or sheet metal part (such as Figure 16 ).

[0114] In summary, the embodiment of the present application successfully solves the installation problem caused by the local irregularity of the optical film assembly 2 in the manufacturing process of the liquid crystal display module by filling the notch 1175 of the frame 11. The film assembly 2 of the embodiment of the present application is successfully and accurately installed on the frame 11, while avoiding interference with the local irregularity of the film assembly 2 and restoring the integrity of the frame 11.

[0115] Please refer to Figure 17 , Figure 17 The tenth structure diagram of the frame provided by the embodiment of the present application. The fixing frame 1 further includes a transparent block 1176 connected to the second supporting part 117 on the side close to the inner side of the containing space 111, i.e. the frame 11, and extending along the second supporting surface 1171. The transparent block 1176 can increase the area of the second supporting surface 1171, aiming to increase the effective area of the second supporting surface 1171, thereby increasing the supporting area provided for the liquid crystal module 20, ensuring the stable fixation of the liquid crystal module 20 in the display device 100.

[0116] The composition material of the transparent block 1176 can be PET (Polyethyleneterephthalate, poly-terephthalate plastic) or polymethyl methacrylate (Polymethyl Methacrylate, PMMA, commonly known as organic glass).

[0117] In summary, the structure of the fixing frame 1 in the embodiment of the present application significantly increases the area of the second supporting surface 1171 by adding the transparent block 1176, providing a more stable support for the liquid crystal module 20, effectively solving the problem of insufficient area of the second supporting surface 1171.

[0118] Please refer to Figure 18 ,Figure 18 A structure diagram of a backlight module is provided in the embodiments of the present application. The embodiments of the present application also provide a backlight module 10, which is used to provide sufficient brightness and uniformly distributed light source, so that the liquid crystal display screen can normally display images. The backlight module 10 has a display area 200 and a non-display area 300, which is also called a BM (Black Matrix) area, surrounding the display area 200. The BM area is mainly formed in the edge area of the liquid crystal panel through specific processes and technologies. In the LCD liquid crystal panel screen, the BM area is located at the outermost periphery of the VA (Visual Area) and its main function is to prevent light from leaking out from the edge of the LCD. Since the backlight panel inside the LCD emits light, the user can see a clear picture. If the BM area is not designed properly or is too narrow, light leakage may occur at the edge of the screen, and even a halo may be formed in the pure black picture, which affects the display effect.

[0119] The backlight module 10 can include a direct type backlight module 10 and a side type backlight module 10. The direct type backlight mode usually refers to using a plurality of LED lamp beads as light sources, and the lamp beads are directly arranged at the back of the liquid crystal panel. The direct type backlight can provide uniform and high brightness backlight effect, and is suitable for large size display device 100. In the embodiments of the present application, the direct type backlight module is described.

[0120] The backlight module 10 includes the fixing frame 1 and the diaphragm assembly 2 in the above embodiments. The diaphragm assembly 2 is arranged in the accommodating space 111 of the fixing frame 1, i.e. the inner side of the frame 11, and the diaphragm assembly 2 is lapped in the groove 113, which provides additional space for the expansion or contraction of the diaphragm assembly 2.

[0121] The film assembly 2 generally comprises one or more films, which can have different functions such as polarization, filtering, protection, etc. The film assembly 2 comprises a lower diffusion film, a prism film, and an upper diffusion film arranged in sequence, which are tightly attached to each other to ensure effective transmission and regulation of light. Specifically, the lower diffusion film is precisely arranged on the first frame part (i.e., a specific part of the frame 11), which is mainly used to collect and homogenize the light emitted from the light guide plate, ensuring that the light can be smoothly projected onto the subsequent prism film. The prism film, also known as brightness enhancement film (BEF), is placed on the lower diffusion film. When the light of the backlight source passes through the prism film, its unique prism structure can guide the light so that only when the light is incident at a specific angle, it can be effectively emitted by refraction. The rest of the light that does not meet the refraction condition will be reflected back to the light source by the edge of the prism and will be used again through the reflection sheet at the bottom of the light source. This process ensures efficient recycling of light in the backlight source, so that the light that would have been dispersed in all directions is effectively controlled within a narrower angle range (e.g., 70% of the light is controlled within a specific angle), thereby significantly enhancing the axial brightness. The upper diffusion film is arranged on the prism film, which not only takes charge of further atomizing the light emitted by the prism film to ensure uniform light transmission, but also plays an important role in protecting the prism film from external damage. Through the processing of the upper diffusion film, the display device 100 can provide a more uniform and soft surface light source, improving the overall visual effect.

[0122] As in the above embodiments, the frame 11 comprises a first support part 115 having a first supporting surface 1151 and a second support part 117 connected to the first supporting surface 1151 of the first support part 115.

[0123] The first support part 115 further has a first inclined surface 1153 facing the inner side of the accommodating space 111, i.e., the inner side of the frame 11. The first inclined surface 1153 is connected to the first supporting surface 1151 and is inclined from the first supporting surface 1151 towards the inner side of the accommodating space 111, i.e., the inner side of the frame 11. In some embodiments, the first inclined surface 1153 is at least partially arranged at the junction of the display area 200 and the non-display area 300.

[0124] The diaphragm assembly 2 is located in the containing space 111, i.e., the inner side of the frame 11, and is overlapped on the upper side of the first supporting surface 1151, thereby ensuring the stability and position accuracy of the diaphragm assembly 2. The diaphragm assembly 2 has a gap with the first inclined surface 1153, which allows the light to penetrate between the diaphragm assembly 2 and the first inclined surface, optimizes the light transmission path, effectively illuminates the non-display area 300 domain below the diaphragm assembly 2, significantly reduces the visual dim phenomenon caused by the obstruction of light, and greatly improves the overall brightness of the display device 100.

[0125] The first inclined surface 1153 can be a curved surface or a folded surface. When the first inclined surface 1153 is a curved surface, the first inclined surface 1153 is a circular arc surface. When the first inclined surface 1153 is a curved surface, the first inclined surface 1153 can be a smooth circular arc surface, which helps to uniformly distribute the light, reduces glare and reflection, and further improves the display effect.

[0126] In some cases, the fixed frame 1 further includes a rib position 119, which is arranged on and protrudes from the first supporting surface 1151. When the diaphragm assembly 2 is overlapped on the upper side of the first supporting surface 1151 of the frame 11, the rib position 119 abuts against the diaphragm assembly 2 to space the diaphragm assembly 2 from the first supporting surface 1151. The function of the rib is to lift the diaphragm assembly 2, thereby forming a gap of a certain height between the diaphragm assembly 2 and the first supporting surface. The existence of this gap promotes the penetration of light, effectively expands the area that can be illuminated by light, and further enhances the brightness performance of the display area 200 domain adjacent to the non-display area 300 domain. This design aims to alleviate the visual dim phenomenon that may be caused by the obstruction of light transmission, thereby improving the overall display effect.

[0127] In the embodiments of the present application, the backlight module 10 can further include a back plate, a light source, a light guide plate, a diaphragm assembly 2, etc. The back plate is used to provide basic support and structural stability. The light source can be an LED (Light Emitting Diode) or a Mini LED, etc. The light source and the FPC (Flexible Printed Circuit) form a light bar. The LED light source can emit stable and high-brightness light. The light guide plate is used to convert the point light source or line light source emitted by the light source into a surface light source, so that the light is uniformly distributed. The light guide plate is generally made of high-transmittance material. The light guide plate has a dot design inside, which can scatter light to form a uniform surface light source.

[0128] Please refer to Figure 19 , Figure 19The first structural schematic diagram of the display device provided by the embodiment of the present application is shown. The embodiment of the present application further provides a display device 100 which integrates the frame 11 design or the backlight module 10 in the above embodiment, and is functionally and structurally optimized on the basis to improve the overall performance and user experience of the display device 100.

[0129] The embodiment of the present application also provides a display device 100, which is an electronic device or component, and the core function thereof is to convert electronic signals, digital signals or other forms of signals into visual information such as images, characters and numbers recognizable by human eyes. The display device 100 can be a television, a computer display, a mobile phone screen, a vehicle-mounted display screen, etc.

[0130] The display device 100 includes the backlight module 10 and the liquid crystal module 20, the liquid crystal module 20 is arranged opposite to the backlight module 10, and the liquid crystal module 20 is connected with the frame 11. The liquid crystal module 20 is overlapped on the second bearing surface 1171 of the frame 11. The liquid crystal module 20 includes a plurality of layers such as a liquid crystal layer, an electrode and a circuit board. The liquid crystal module 20 displays images or information by controlling the arrangement of liquid crystal molecules. The layer closest to the backlight module 10 of the liquid crystal module 20 is a polarizing plate layer, and the area of the polarizing plate layer is smaller than that of other film layers, i.e., the polarizing plate layer is inwardly recessed relative to other film layers. The inward recess of the polarizing plate layer can effectively prevent light from leaking out of the edges of the liquid crystal module 20, thereby avoiding unnecessary light halo and glare outside the display area 200. This helps to improve the display effect and user experience of the liquid crystal display screen.

[0131] The fixing frame 1 in the backlight module 10 is usually a frame-shaped structure for supporting and fixing other components such as the diaphragm assembly 2 and the liquid crystal module 20. The fixing frame 1 forms an accommodating space 111, and a groove 113 is arranged on the inner surface of the frame 11. The diaphragm assembly 2 can be arranged in the groove 113, and the liquid crystal module 20 can be connected with the end surface of the frame 11. In other words, the liquid crystal module 20 and the diaphragm assembly 2 adopt a layered layout in this embodiment, and are not fixed in the same plane. Through the ingenious use of this layered design, sufficient fixing area is provided for the liquid crystal module 20 while ensuring that the expansion / contraction space of the diaphragm assembly 2 is not affected, thereby significantly improving the display quality and stability of the overall display device 100.

[0132] In order to enhance the connection stability and reliability between the liquid crystal module 20 and the frame 11, the display device 100 further comprises a first adhesive 30 arranged between the second supporting surface 1171 and the liquid crystal module 20, for fixing the liquid crystal module 20 on the frame 11. The liquid crystal module 20 is firmly fixed on the frame 11 by the adhesive force of the first adhesive 30. This fixing method is not only simple and easy to implement, but also can effectively prevent the liquid crystal module 20 from loosening or falling off during long-term use. The first adhesive 30 can be foam glue or AB glue.

[0133] Please refer to Figure 20 , Figure 20 The second structural diagram of the display device provided by the embodiment of the present application is shown. In order to further improve the stability and convenience of the fixation of the liquid crystal module 20, the display device 100 further comprises an auxiliary positioning assembly 40 connected with the backlight module 10 and the liquid crystal module 20, and the auxiliary positioning assembly 40 corresponds to the first adhesive 30. The auxiliary positioning assembly 40 can be a magnet assembly or a buckle assembly to guide or temporarily fix the backlight module 10 and the liquid crystal module 20.

[0134] Specifically, the auxiliary positioning assembly 40 comprises a first magnetic member 401 and a second magnetic member 402. The first magnetic member 401 is arranged on the second supporting surface 1171 of the backlight module 10, and the second magnetic member 402 is arranged on the liquid crystal module 20. The first magnetic member 401 and the second magnetic member 402 are arranged correspondingly, and the first adhesive 30 is arranged between the first magnetic member 401 and the second magnetic member 402. When the liquid crystal module 20 is overlapped on the second supporting surface 1171, the first magnetic member 401 and the second magnetic member 402 attract each other, thereby providing additional fixing force and positioning guidance. In addition, the first adhesive 30 is arranged between the first magnetic member 401 and the second magnetic member 402, which not only ensures the effect of adhesive fixation, but also avoids the interference of the magnetic member on the performance of the first adhesive 30.

[0135] The display device 100 further comprises a middle frame, which comprises a first frame portion, a second frame portion and a third frame portion. The first frame portion is arranged on the circumferential side of the fixing frame 1 and the back plate. The second frame portion and the third frame portion are connected with the first frame portion. The first frame portion extends along the thickness direction of the display device 100. The second frame portion and the third frame portion extend along the direction perpendicular to the thickness direction of the display device 100. The second frame portion is connected with the side of the liquid crystal module 20 away from the backlight module 10. The third frame portion is connected with the side of the backlight module 10 away from the liquid crystal module 20. The first frame portion of the middle frame realizes the secondary fixation of the liquid crystal module 20. The third frame portion can be connected with the fixing frame 1 by bolts.

[0136] Further, the display device 100 further comprises a third adhesive member arranged between the middle frame and the liquid crystal module 20, for fixing the middle frame on the liquid crystal module 20. The third adhesive member is similar to the first adhesive member, and thus will not be described herein again. Further, the third adhesive member can be arranged between the liquid crystal module 20 and the second frame portion, for realizing accurate fixing.

[0137] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0138] In the description of the present application, the terms "first", "second" are only used 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.

[0139] The fixed frame, backlight module and 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 scope can be changed, and the above description of the present application should not be understood as a limitation.

Claims

1. A fixture, characterized in that The frame comprises a first support part and a second support part connected to each other, the first support part has a first supporting surface for supporting a film assembly; The second support part is connected to the first supporting surface of the first support part; The first support part further has a first inclined surface, the first inclined surface is towards the inner side of the frame, the first inclined surface is connected to the first supporting surface, and the first inclined surface is inclined from the first supporting surface towards the inner side of the frame; A first reflective layer is arranged on the first inclined surface. The first reflective layer is an ink layer or a plastic layer.

2. The fixture of claim 1, wherein The first reflective layer comprises a grating structure and / or a metasurface structure.

3. The fixture of claim 2, wherein, The first inclined surface is a curved surface or a folded surface.

4. The fixture of any one of claims 1 to 3, wherein, When the first inclined surface is a curved surface, the first inclined surface is a circular arc surface.

5. The fixture of claim 4, wherein, A rib position is arranged on the first supporting surface and protrudes from the first supporting surface.

6. The fixture of any one of claims 1 to 3, wherein, The number of rib positions is at least two, and the rib positions are distributed at intervals.

7. The fixture of claim 6, wherein In the direction in which the first support part points to the second support part, the cross-sectional area of the rib position gradually decreases.

8. The fixture of claim 6, wherein, The rib position comprises a dot-shaped rib position or a long strip-shaped rib position.

9. The fixture of claim 6, wherein, When the rib position is a long strip-shaped rib position, the extension direction of the rib position is perpendicular to the edge of the first supporting surface close to the inner side of the frame.

10. The fixture of claim 9, wherein, The frame comprises a first support part and a second support part connected to each other, the first support part has a first supporting surface for supporting a film assembly; 11. A backlight module, characterized in that, The second support part is connected to the first supporting surface of the first support part; The first support part further has a first inclined surface, the first inclined surface is towards the inner side of the frame, the first inclined surface is connected to the first supporting surface, and the first inclined surface is inclined from the first supporting surface towards the inner side of the frame; A first reflective layer is arranged on the first inclined surface.

12. A display device comprising: The first reflective layer is an ink layer or a plastic layer. The first reflective layer comprises a grating structure and / or a metasurface structure. The first inclined surface is a curved surface or a folded surface. When the first inclined surface is a curved surface, the first inclined surface is a circular arc surface. A rib position is arranged on the first supporting surface and protrudes from the first supporting surface. The number of rib positions is at least two, and the rib positions are distributed at intervals. In the direction in which the first support part points to the second support part, the cross-sectional area of the rib position gradually decreases. The rib position comprises a dot-shaped rib position or a long strip-shaped rib position. When the rib position is a long strip-shaped rib position, the extension direction of the rib position is perpendicular to the edge of the first supporting surface close to the inner side of the frame. The frame comprises a first support part and a second support part connected to each other, the first support part has a first supporting surface for supporting a film assembly; The second support part is connected to the first supporting surface of the first support part; The first support part further has a first inclined surface, the first inclined surface is towards the inner side of the frame, the first inclined surface is connected to the first supporting surface, and the first inclined surface is inclined from the first supporting surface towards the inner side of the frame; A first reflective layer is arranged on the first inclined surface. The first reflective layer is an ink layer or a plastic layer. The first reflective layer comprises a grating structure and / or a metasurface structure. The first inclined surface is a curved surface or a folded surface. When the first inclined surface is a curved surface, the first inclined surface is a circular arc surface. A rib position is arranged on the first supporting surface and protrudes from the first supporting surface. The number of rib positions is at least two, and the rib positions are distributed at intervals. In the direction in which the first support part points to the second support part, the cross-sectional area of the rib position gradually decreases. The rib position comprises a dot-shaped rib position or a long strip-shaped rib position. When the rib position is a long strip-shaped rib position, the extension direction of the rib position is perpendicular to the edge of the first supporting surface close to the inner side of the frame.

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