Backlight module and display device

Abstract

The embodiment of the invention provides a backlight module and a display device. The backlight module comprises a light-emitting substrate and a plurality of light-emitting elements, wherein the light-emitting substrate comprises a substrate and a plurality of light-emitting elements arranged on the substrate; the bearing structure is arranged around the light-emitting area of the light-emitting substrate; the light uniformizing plate is arranged on one side of the bearing structure in the light emitting direction of the light emitting substrate, a preset distance is arranged between the light uniformizing plate and the light emitting substrate, and the bearing structure is provided with a supporting end face facing the light uniformizing plate; the filling material belt is located on the supporting end face and arranged in the extending direction of the supporting end face, and the light uniformizing plate is arranged on the side, away from the bearing structure, of the filling material belt in a pressed mode, so that the filling material belt is extruded and fills a gap between the light uniformizing plate and the supporting end face. According to the technical scheme, when the light-emitting element emits blue light, the problem that the edge of a display picture is blued can be solved.

Description

Technical Field

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

[0002] Quantum dot materials have the characteristics of wide excitation spectrum, narrow emission spectrum, high color purity and good light stability. The application of quantum dot materials in display devices can improve the color gamut of display devices. However, while quantum dot materials improve the vividness of the display screen, there is a problem of blue edges of the display device. With the rapid popularization of narrow bezels of display devices, the blue edge problem is becoming more and more obvious. Summary of the invention

[0003] The embodiments of the present disclosure provide a backlight module and a display device to solve or alleviate one or more technical problems in the prior art.

[0004] As a first aspect of an embodiment of the present disclosure, an embodiment of the present disclosure provides a backlight module, including:

[0005] A light-emitting substrate, comprising a base substrate and a plurality of light-emitting elements arranged on one side of the base substrate, wherein the light-emitting substrate comprises a light-emitting area and a frame area located outside the light-emitting area, and the light-emitting elements are located in the light-emitting area;

[0006] A supporting structure is arranged around the light-emitting area of ​​the light-emitting substrate;

[0007] A light diffuser is arranged on one side of the supporting structure along the light emitting direction of the light emitting substrate, a preset distance is arranged between the light diffuser and the light emitting substrate, and the supporting structure is provided with a supporting end surface facing the light diffuser;

[0008] The filling material belt is located on the support end surface and is arranged along the extension direction of the support end surface. The light diffuser is pressed on the side of the filling material belt away from the supporting structure. The filling material belt is squeezed and fills the gap between the light diffuser and the support end surface.

[0009] In some embodiments, the material of the filler material strips comprises a thermoplastic elastomer.

[0010] In some embodiments, the light emitting element emits a first color light, and the filling material strip is doped with a functional material, and the functional material is used to absorb the first color light or generate white light under the first color light.

[0011] In some embodiments, the functional material includes a phosphor that generates white light under a first color light.

[0012] In some embodiments, the first color light includes blue light, and the phosphor includes yellow phosphor.

[0013] In some embodiments, a groove is formed on the support end surface along the extension direction of the support end surface, a portion of the filling material strip is embedded in the groove, and another portion of the filling material strip fills the gap between the light diffuser and the support end surface.

[0014] In some embodiments, the width of the groove is 1 mm to 2 mm; and / or the depth of the groove is greater than or equal to 1 mm.

[0015] In some embodiments, the supporting structure is provided with an inner side surface connected to the supporting end surface, and a reflective layer is provided on the surface of the inner side surface.

[0016] In some embodiments, a back plate is further included, the back plate includes a support portion and a folded edge portion arranged along the edge of the support portion, the light-emitting substrate, the supporting structure and the light-dispersing plate are all located in a space defined by the support portion and the folded edge portion, and the supporting structure is arranged around the periphery of the light-emitting substrate;

[0017] The backlight module also includes an optical film group, which is located on the side of the light homogenizing plate away from the light-emitting substrate.

[0018] In some embodiments, the orthographic projection of the light diffuser plate on the support portion is located inside the orthographic projection of the optical film assembly on the support portion.

[0019] In some embodiments, a preset gap is provided between the outer edge of the optical film group and the folded edge portion for accommodating expansion and deformation of the optical film group.

[0020] As a second aspect of the embodiments of the present disclosure, the embodiments of the present disclosure provide a display device, including the backlight module in any embodiment of the present disclosure, and also including a display panel, and the display panel is located on the light emitting side of the backlight module.

[0021] In the technical solution of the embodiment of the present disclosure, the filling material belt is located on the support end face and is arranged along the extension direction of the support end face, so that the filling material belt surrounds the light-emitting area of ​​the light-emitting substrate; the light-diffusing plate is pressed on the filling material belt so that the filling material belt is squeezed and fills the gap between the light-diffusing plate and the support end face. With such a structure, the filling material belt can fill the gap between the light-diffusing plate and the support end face, preventing the light generated by the light-emitting element from leaking from the gap between the light-diffusing plate and the support end face, thereby reducing the edge light leakage of the backlight module. When the light-emitting element emits blue light, the backlight module of the embodiment of the present disclosure can reduce the edge blue light leakage and improve the blue edge problem of the display screen.

[0022] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present disclosure will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments according to the present disclosure and should not be regarded as limiting the scope of the present disclosure.

[0024] Figure 1 A schematic diagram of the structure of a display device in the related art;

[0025] Figure 2 A schematic diagram of the structure of a display device in the related art;

[0026] Figure 3 for Figure 2 Schematic diagram of light leakage in the gap between the central light diffuser and the supporting structure;

[0027] Figure 4 It is a structural schematic diagram of a display device in one embodiment of the present disclosure;

[0028] Figure 5 for Figure 4 Schematic diagram of the light path in the gap between the middle light homogenizing plate and the supporting structure;

[0029] Figure 6 for Figure 4 Schematic cross-section of the central support structure.

[0030] Description of reference numerals:

[0031] 11 / 21, back panel; 13, light guide plate; 14, quantum dot film; 16 / 27, outer plastic frame; 17, foam; 18, display panel; 22, adhesive material; 23, light-emitting substrate; 24, supporting structure; 25, light-homogenizing plate; 26, optical film group; 19, buffer. DETAILED DESCRIPTION

[0032] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure, and different embodiments may be combined arbitrarily without conflict. Therefore, the drawings and descriptions are considered to be illustrative in nature and not restrictive.

[0033] The light emitting diode (LED) in the present disclosure may be a sub-millimeter light emitting diode (Mini Light Emitting Diode, referred to as Mini LED), or may be a micro light emitting diode (Micro Light Emitting Diode, referred to as Micro LED).

[0034] The reasons for the blue edge of quantum dot display devices mainly include the factors of the quantum dot film itself and the structural factors of the display device. For the blue edge caused by the quantum dot film itself, the quality of the water and oxygen barrier film can be improved; for the blue edge caused by the structural factors of the display device, the structure of the display device needs to be further improved to improve the blue edge.

[0035] Figure 1 FIG. 1 is a schematic diagram of a display device in the related art. Figure 1 As shown, the display device includes a backlight module and a display panel 18, and the backlight module is an edge-entry backlight module. The edge-entry backlight module includes a light source 10, a light guide plate 12, a back plate 11, a quantum dot film 13 and an optical film group 14, and the light source is located on the side of the light guide plate. The back plate 11 includes a supporting portion 111 and a folding portion 112, and the folding portion 112 is arranged along the edge of the supporting portion 111. The light guide plate 12, the quantum dot film 13 and the optical film group 14 are all located in the space defined by the back plate 11. A reflective sheet 15 is arranged on the lower surface of the light guide plate 12. The backlight module may also include an outer plastic frame 16, and the outer plastic frame 16 is overlapped at the upper end of the folding portion. The display panel is located on the light output side of the backlight module, and a foam 17 is arranged between the display panel 18 and the outer plastic frame 16. It should be noted that, Figure 1 As shown in the figure, the light source 10 is generally located on the right side of the light guide plate 12, and the specific arrangement of the light source 10 and the light guide plate 12 can be determined according to actual conditions.

[0036] The light source can generate blue light, and the quantum dot film has a peripheral failure area, which causes some blue light to leak out. By improving the material and design of the quantum dot film, the blue light leakage caused by the peripheral failure area can be improved. In addition, the structure of the existing backlight module will also cause some light leakage, which in turn causes blue light to leak out and the edges of the display screen to be blue. For example, Figure 1 In the image, after the blue light generated by the light source is evenly spread through the light guide plate, a part of the light does not pass through the quantum dot film to be converted into white light but leaks out from the edge.

[0037] Figure 2 FIG. 1 is a schematic diagram of a display device in the related art. Figure 2 As shown, the display device adopts a direct-type backlight module, and the display panel 18 is located on the light-emitting side of the direct-type backlight module. The direct-type backlight module may include a back plate 21, a light-emitting substrate 23, a supporting structure 24, a light-homogenizing plate 25, an optical film group 26, and an outer plastic frame 27. The display panel 18 is located on the upper side of the outer plastic frame 27, and foam is arranged between the display panel 18 and the outer plastic frame 27.

[0038] like Figure 2As shown, the light-emitting substrate 23 may include a base substrate and a plurality of light-emitting diodes arranged on the base substrate. The lower side of the light-emitting substrate 23 is fixed to the back plate 21 by adhesive. The optical film group 26 is located on the upper side of the light-diffusing plate 25, and the light-diffusing plate 25 is supported by the supporting structure 24, so that a light mixing distance is formed between the light-emitting substrate 23 and the light-diffusing plate 25.

[0039] It should be noted that the optical film group 26 may include multiple layers of optical films. When the temperature increases, each optical film and the light diffuser 25 will expand. Therefore, a certain gap will be reserved between each film layer between the supporting structure 24 and the outer plastic frame 27. During the operation of the display device, the gaps between the film layers will cause light leakage.

[0040] Figure 3 for Figure 2 Schematic diagram of light leakage in the gap between the central light diffuser and the supporting structure. Figure 3 As shown, the light emitted by the light emitting substrate 23 will leak out through the gap between the light homogenizing plate 25 and the supporting structure 24, resulting in light leakage at the edge of the display device.

[0041] To improve Figure 2 In order to reduce the light leakage, the first method is to increase the size of the optical film group 26 and the light diffuser 25, so that more light enters the light diffuser 25 or the optical film group 26, thereby reducing the light leakage. The second method is to use glue to fix the fluorescent powder strip on the upper surface of the supporting structure 24, thereby reducing the amount of light leaking from the gap between the light diffuser 25 and the supporting structure 24.

[0042] For the first method, the backlight module will experience high and low temperature working conditions during the reliability test, which will cause the optical film to radiate and deform. The optical film expands at high temperatures and shrinks at low temperatures. For example, for a 31.5-inch display product, the single-side size of the optical film will shrink by about 1mm after the reliability test, making the edge light leakage more serious.

[0043] In the second method, the adhesive material has poor bonding with the surface of the light diffuser 25 , and the effect of improving light leakage is poor.

[0044] It should be noted that the light emitting diodes in the light emitting substrate 23 usually emit blue light, and the optical film group 26 may include a quantum dot film, which can convert the blue light emitted by the light emitting diodes into white light. When the blue light emitted by the light emitting substrate 23 leaks through the gap between the light homogenizing plate 25 and the supporting structure 24, it will cause the edge of the display screen to turn blue.

[0045] Figure 4 FIG. 1 is a schematic diagram of the structure of a display device in one embodiment of the present disclosure. Figure 4As shown, the display device includes a backlight module and a display panel 18, and the display panel 18 is located on the light-emitting side of the backlight module. The backlight module may include a light-emitting substrate 23, a supporting structure 24, a light-homogenizing plate 25, and a filling material strip 30. The light-emitting substrate 23 includes a base substrate and a plurality of light-emitting elements arranged on one side of the base substrate. The light-emitting element may be a light-emitting diode. The light-emitting substrate 23 may include a light-emitting area and a frame area located outside the light-emitting area, and the light-emitting element may be located in the light-emitting area. Exemplarily, a plurality of light-emitting elements may be arranged at intervals in the light-emitting area. No light-emitting element is arranged in the frame area.

[0046] The supporting structure 24 may be disposed around the light emitting area of ​​the light emitting substrate 23. That is, the supporting structure 24 may be disposed at the periphery of the light emitting area, so that the supporting structure 24 may surround the light emitting area.

[0047] The light diffuser 25 is disposed on one side of the supporting structure 24 along the light emitting direction of the light emitting substrate 23 . A preset distance is provided between the light diffuser 25 and the light emitting substrate 23 , and the supporting structure 24 is provided with a supporting end surface 241 facing the light diffuser 25 .

[0048] For example, Figure 4 In the embodiment, the light emitting direction of the light emitting substrate 23 is upward from the light emitting substrate 23, so the light diffuser 25 is arranged on the upper side of the supporting structure 24. The supporting end surface 241 can be the upper end surface of the supporting structure 24, and the light diffuser 25 is supported by the supporting structure 24, that is, the light diffuser 25 is supported on the supporting end surface 241 of the supporting structure 24.

[0049] The preset distance between the light homogenizing plate 25 and the light emitting substrate 23 can be used as a light mixing distance of the backlight module, so that the light emitted by each light emitting element in the light emitting substrate 23 can be fully mixed and then enter the light homogenizing plate 25 .

[0050] like Figure 4 As shown, the filling material strip 30 is located on the support end face 241 and is arranged along the extension direction of the support end face 241, so that the filling material strip 30 surrounds the light-emitting area of ​​the light-emitting substrate 23. The light-diffusing plate 25 is pressed on the side of the filling material strip 30 that is away from the supporting structure 24, and the filling material strip 30 is squeezed and fills the gap between the light board and the support end face 241 to prevent the light generated by the light-emitting element from leaking from the gap. Exemplarily, the light-diffusing plate 25 can be pressed on the filling material strip 30 under the action of gravity or external force, so that the filling material strip 30 is squeezed by the light-diffusing plate 25, and then the filling material strip 30 can fill the gap between the light-diffusing plate 25 and the supporting structure 24.

[0051] In the backlight module of the embodiment of the present disclosure, the filling material strip 30 is located on the support end face 241 and is arranged along the extension direction of the support end face 241, so that the filling material strip 30 surrounds the light-emitting area of ​​the light-emitting substrate 23; the light-diffusing plate 25 is pressed on the filling material strip 30 so that the filling material strip 30 is squeezed and fills the gap between the light-diffusing plate 25 and the support end face 241. With such a structure, the filling material strip 30 can fill the gap between the light-diffusing plate 25 and the support end face 241, preventing the light generated by the light-emitting element from leaking from the gap between the light-diffusing plate 25 and the support end face 241, thereby reducing the edge light leakage of the backlight module. When the light-emitting element emits blue light, the backlight module of the embodiment of the present disclosure can reduce the edge blue light leakage and improve the blue edge problem of the display screen.

[0052] Figure 5 for Figure 4 Schematic diagram of the light path in the gap between the light homogenizer and the supporting structure. Figure 5 As shown, when the light emitted by the light-emitting element on the light-emitting substrate 23 reaches the gap between the light-diffusing plate 25 and the supporting end surface 241, the filling material strip 30 can prevent the light emitted by the light-emitting element from leaking out of the gap. When the light-emitting element emits blue light, the backlight module of the embodiment of the present disclosure can reduce the edge blue light leakage and improve the blue light problem at the edge of the display screen.

[0053] Exemplarily, the surface of the light-diffusing plate 25 facing the light-emitting substrate 23 can be provided with a light-diffusing pattern. Therefore, the gap between the light-diffusing plate 25 and the supporting structure 24 can be an irregular gap. After the filling material strip 30 is extruded, the irregular gap can be filled according to the shape of the irregular gap. Thus, the irregular gap between the light-diffusing plate 25 and the supporting structure 24 can be completely filled with the filling material strip 30, preventing the light generated by the light-emitting element from leaking from the gap between the light-diffusing plate 25 and the supporting structure 24.

[0054] In one embodiment, the material of the filling material strip 30 may include thermoplastic elastomer (TPE / TPR). The filling material strip 30 of this material has good thermoplasticity and elasticity. When the filling material strip 30 is squeezed, the filling material strip 30 can be deformed according to the gap between the light diffuser 25 and the supporting structure 24 and completely fill the gap. In addition, the filling material strip 30 can maintain the shape of filling the gap and effectively block light from leaking from the gap.

[0055] In one embodiment, the light emitting element can emit a first color light, and the filling material strip 30 is doped with a functional material, and the functional material is used to absorb the first color light or generate white light under the first color light.

[0056] Exemplarily, the functional material can absorb the first color light, so that the filling material strip 30 blocks the first color light from leaking out of the gap. The first color light may include blue light, and the functional material can be made of a material that can absorb blue light, and the functional material particles are doped in the filling material strip 30 so that the functional material absorbs blue light and prevents the blue light from leaking out of the gap.

[0057] Exemplarily, the functional material can generate white light under a first color light, and the functional material can include a phosphor, and the phosphor generates white light under the first color light. For example, the phosphor is excited to generate a second color light, and the second color light is mixed with the first color light to generate white light.

[0058] Exemplarily, the first color light includes blue light, the phosphor includes yellow phosphor, the yellow phosphor is excited to generate yellow light, and the yellow light is mixed with the blue light to generate white light.

[0059] It should be noted that the functional material is not limited to phosphors, and the functional material may also be other materials that can absorb the first color light.

[0060] It is understandable that for viewers who are watching the display screen, the blue edge of the display screen has a greater visual impact and affects the effect of the display screen. With the backlight module of the embodiment of the present disclosure, when the functional material generates white light under the first color light, the edge of the display screen is white light, which has a smaller visual impact. The white light at the edge of the display screen will not affect the effect of the display screen and usually will not reduce the user's viewing experience.

[0061] Figure 6 for Figure 4 A cross-sectional schematic diagram of the support structure. In one embodiment, Figure 4 and Figure 6 As shown, the support end surface 241 is provided with a groove 243 along the extension direction of the support end surface 241, a part of the filling material strip 30 is embedded in the groove 243, and another part of the filling material strip 30 fills the gap between the light diffuser 25 and the support end surface 241. With such a structure, the groove 243 can position the filling material strip 30 to prevent the filling material strip 30 from shifting and affecting the filling effect during the squeezing process of the light diffuser 25. By providing the groove 243, the filling material strip 30 can be positioned at a preset position, thereby improving the filling effect of the filling material strip 30 on the gap.

[0062] The groove 243 may be arranged along the extension direction of the support end surface 241 , so that after the filling material strip 30 is embedded in the groove 243 , the filling material strip 30 surrounds the light emitting area.

[0063] The cross-sectional shape of the groove 243 can be set as required. For example, the cross-sectional shape of the groove 243 can be a polygon, such as a quadrilateral.

[0064] like Figure 6 As shown, the width W of the groove 243 may be 1 mm to 2 mm, for example, the width W of the groove 243 may be 1 mm, 1.5 mm or 2 mm. The width of the groove 243 is the dimension of the groove 243 perpendicular to its extension direction. The depth H of the groove 243 may be greater than or equal to 1 mm.

[0065] In one embodiment, a filling material belt 30 that meets the requirements can be prepared or purchased, and the filling material belt 30 is installed in the groove 243, and then the light diffuser 25 is placed on the side of the filling material belt 30 that is away from the supporting structure 24, so that the light diffuser 25 is pressed on the filling material belt 30, and the filling material belt 30 is squeezed and fills the gap between the light diffuser 25 and the supporting end surface 241. In this way, it is necessary to purchase or prepare a filling material belt 30 that meets the requirements according to the display product specifications.

[0066] In another embodiment, a filling device such as a hot glue gun may be used to fill the groove 243 with a thermoplastic resin, and the thermoplastic resin may be doped with a functional material. After the thermoplastic resin returns to room temperature, a filling material strip 30 is formed, and the filling material strip 30 is installed in the groove 243. In this way, the filling material strip 30 can be prepared by using conventional filling equipment such as a hot glue gun, and the filling material strip 30 that meets the requirements can be prepared according to the specifications of the display product, without the need to purchase or prepare the filling material strip 30 separately, which is conducive to reducing costs.

[0067] Thermoplastic resin may include thermoplastic rubber. Thermoplastic rubber is poured into the groove 243, and the thermoplastic rubber has certain elasticity and viscosity. When the light diffuser 25 is pressed on the thermoplastic rubber, the thermoplastic rubber is squeezed and then filled into the gap between the light diffuser 25 and the supporting end surface 241, ensuring that the gap between the light diffuser 25 and the supporting end surface 241 is completely filled.

[0068] In one embodiment, Figure 4 As shown, the supporting structure 24 is provided with an inner side surface 242, the inner side surface 242 faces the light-emitting area, and the inner side surface 242 is connected to the supporting end surface 241. A reflective layer is provided on the surface of the inner side surface 242. The reflective layer is provided on the inner side surface 242 so that the light irradiated to the inner side surface 242 can be reflected back to the light-emitting area, reducing the amount of light entering the gap between the light-diffusing plate 25 and the supporting end surface 241, and further improving the problem of shiny edges or bluish edges of the backlight module.

[0069] Exemplarily, the inner side surface 242 can be an open inclined surface. For example, the inner side surface 242 of the supporting structure 24 is an open inclined surface in the direction from the light-emitting substrate 23 toward the light-diffusing plate 25, so that the light irradiated to the reflective layer can be reflected into the light-diffusing plate 25, reducing light loss and reducing the amount of light entering the gap between the light-diffusing plate 25 and the supporting end surface 241.

[0070] The material of the reflective layer may include metallic silver, or may be other materials having reflective properties.

[0071] like Figure 4 As shown, the backlight module may further include a back plate 21, the back plate 21 includes a support portion 211 and a folded edge portion 212, and the folded edge portion 212 may be arranged along the edge of the support portion 211. The light-emitting substrate 23, the supporting structure 24 and the light-dispersing plate 25 are all located in the space defined by the support portion 211 and the folded edge portion 212. The supporting structure 24 is arranged around the periphery of the light-emitting substrate 23.

[0072] The side of the light-emitting substrate 23 facing away from the light-emitting element can be attached to the upper surface of the support portion 211 by means of adhesive material 22, and the adhesive material 22 can include a thermally conductive easy-to-pull adhesive. The supporting structure 24 can be placed on the upper surface of the support portion 211, and the supporting structure 24 is arranged around the periphery of the light-emitting substrate 23. The light-dispersing plate 25 is located on the upper side of the supporting structure 24.

[0073] like Figure 4 As shown, the backlight module may further include an optical film group 26, which is located on the side of the light homogenizer 25 away from the light-emitting substrate 23. The optical film group 26 may include a quantum dot film, which may convert the first color light emitted by the light-emitting element into white light. The first color light may be blue light.

[0074] The optical film group 26 may also include optical films such as prism films and diffusion films that are beneficial to light uniformity.

[0075] In one embodiment, Figure 4 As shown, the orthographic projection of the light diffuser 25 on the support portion 211 may be located inside the orthographic projection of the optical film group 26 on the support portion 211, that is, Figure 4 In the embodiment, the horizontal dimension of the optical film group 26 is larger than the horizontal dimension of the light diffuser 25. Therefore, even if a small amount of light leaks out from the gap between the light diffuser 25 and the supporting structure 24, since the horizontal dimension of the optical film group 26 is larger than the horizontal dimension of the light diffuser 25, the leaked light can enter the optical film group 26 and be converted into white light or be diffused, thereby reducing the brightness of the light leakage at the edge of the backlight module and further improving the edge brightness or edge bluish problem.

[0076] In one embodiment, the optical film group 26 is located in the space defined by the folded edge portion 212. A preset gap is provided between the outer edge of the optical film group 26 and the folded edge portion 212 to accommodate the expansion and deformation of the optical film group 26. Therefore, during the reliability test or product use, when the product temperature rises, the preset gap can accommodate the deformation of the optical film group 26 due to high temperature expansion, thereby preventing the optical film group 26 from being damaged due to insufficient space to accommodate the expansion and deformation, thereby improving the performance of the product.

[0077] The size of the preset gap can be set as needed and is not specifically limited here.

[0078] The present disclosure also provides a display device, which includes the backlight module in any embodiment of the present disclosure. The display device may also include a display panel 18, which may be located on the light-emitting side of the backlight module. Figure 4 As shown, the display device may further include an outer plastic frame 27, which is overlapped on the upper end surface of the folded edge portion 212. The display panel 18 is located on the upper side of the outer plastic frame 27, and a buffer 19 is provided between the display panel 18 and the outer plastic frame 27, and the buffer 19 may include foam.

[0079] The display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, or the like.

[0080] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0081] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0082] In the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0083] In the present disclosure, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0084] The disclosure above provides many different embodiments or examples to implement different structures of the present disclosure. In order to simplify the present disclosure, the components and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present disclosure. In addition, the present disclosure can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0085] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A backlight module, characterized in that: include: A light-emitting substrate, comprising a base substrate and a plurality of light-emitting elements arranged on one side of the base substrate, wherein the light-emitting substrate comprises a light-emitting area and a frame area located outside the light-emitting area, and the light-emitting elements are located in the light-emitting area; A supporting structure, arranged around the light-emitting area of ​​the light-emitting substrate; A light diffuser is arranged on one side of the supporting structure along the light emitting direction of the light emitting substrate, a preset distance is arranged between the light diffuser and the light emitting substrate, and the supporting structure is provided with a supporting end surface facing the light diffuser; The filling material belt is located on the support end surface and is arranged along the extension direction of the support end surface. The light diffuser is pressed on the side of the filling material belt away from the supporting structure. The filling material belt is squeezed and fills the gap between the light diffuser and the support end surface.

2. The backlight module according to claim 1, characterized in that: The material of the filling material strip includes a thermoplastic elastomer.

3. The backlight module according to claim 1, characterized in that: The light emitting element emits a first color light, and the filling material strip is doped with a functional material, and the functional material is used to absorb the first color light or generate white light under the first color light.

4. The backlight module according to claim 3, characterized in that: The functional material includes phosphor, which generates white light under a first color light.

5. The backlight module according to claim 4, characterized in that: The first color light includes blue light, and the phosphor includes yellow phosphor.

6. The backlight module according to any one of claims 1 to 5, characterized in that: The support end surface is provided with a groove along the extension direction of the support end surface, a part of the filling material strip is embedded in the groove, and another part of the filling material strip fills the gap between the light diffuser and the support end surface.

7. The backlight module according to claim 6, characterized in that: The width of the groove is 1 mm to 2 mm; and / or the depth of the groove is greater than or equal to 1 mm.

8. The backlight module according to claim 1, characterized in that: The supporting structure is provided with an inner side surface connected to the supporting end surface, and a reflective layer is provided on the surface of the inner side surface.

9. The backlight module according to claim 1, characterized in that: It also includes a back plate, the back plate includes a support portion and a folded edge portion arranged along the edge of the support portion, the light-emitting substrate, the supporting structure and the light-diffusing plate are all located in a space defined by the support portion and the folded edge portion, and the supporting structure is arranged around the periphery of the light-emitting substrate; The backlight module further comprises an optical film group, and the optical film group is located on a side of the light homogenizing plate away from the light emitting substrate.

10. The backlight module according to claim 9, characterized in that: The orthographic projection of the light diffuser plate on the support portion is located inside the orthographic projection of the optical film group on the support portion.

11. The backlight module according to claim 10, characterized in that: A preset gap is provided between the outer edge of the optical film group and the folded edge portion for accommodating expansion and deformation of the optical film group.

12. A display device, characterized in that: The backlight module comprises any one of claims 1 to 11, and further comprises a display panel, wherein the display panel is located at the light emitting side of the backlight module.

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