Backlight module and display device

Abstract

The invention provides a backlight module and a display device, and the backlight module comprises a light source; the lower shell comprises a side wall and a bottom plate which are connected with each other, the side wall and the bottom plate form a containing space, and the light source is located in the containing space; the optical film is positioned in the accommodating space and is positioned above the light source; the rubber frame is located at the joint of the side wall and the bottom plate, the optical film is located on the rubber frame, and the edge of the optical film makes contact with the rubber frame; the rubber frame comprises a light-transmitting material, a light-incident surface of the rubber frame close to the light source is provided with a light-condensing structure, and a light-emitting surface of the rubber frame contacted with the optical film is provided with a light-scattering structure. The brightness of the edge of the optical film can be improved, and the brightness uniformity and chromaticity uniformity of the optical film are improved.

Description

Technical Field

[0001] The present disclosure relates to the field of displays, and more particularly, to a backlight module and a display device. Background Art

[0002] In related technologies, a light source is disposed inside a lower housing of a backlight module. A rubber frame is disposed around the light source inside the lower housing. The rubber frame is used to support optical films of the backlight module. A reflector is disposed between the rubber frame and the light source. However, since the reflector in related technologies reflects the light rays emitted by the light source to the inner side of the lower housing, and the rubber frame is light-impermeable, as a result, no light rays are emitted from the optical films at the overlapping portion between the optical films and the rubber frame, thereby causing the edges of the optical films to be darker.

[0003] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0004] In view of this, the present disclosure provides a backlight module and a display device to at least solve the problem that the edges of the optical films of the existing backlight module are darker.

[0005] On the one hand, an embodiment of the present disclosure provides a backlight module, including: a light source; a lower housing, the lower housing includes a side wall and a bottom plate connected to each other, the side wall and the bottom plate form an accommodation space, and the light source is located in the accommodation space; an optical film, the optical film is located in the accommodation space and above the light source; a rubber frame, the rubber frame is located at the connection between the side wall and the bottom plate, the optical film is located above the rubber frame, and the edge of the optical film contacts the rubber frame; the rubber frame includes a light-transmitting material, the light-incident surface of the rubber frame close to the light source has a light-concentrating structure, and the light-emitting surface of the rubber frame in contact with the optical film has a light-diffusing structure.

[0006] On the other hand, an embodiment of the present disclosure further provides a display device, including the above-mentioned backlight module.

[0007] Compared with the prior art, the present disclosure has at least the following technical effects:

[0008] The backlight module and display device of the present disclosure cancel the reflective sheet between the light source and the rubber frame, so that the light emitted from the light source can directly irradiate the edge of the rubber frame and the optical film, thereby improving the brightness of the edge of the optical film of the backlight module and enhancing the brightness uniformity and chromaticity uniformity of the optical film. Moreover, since the rubber frame includes a light-transmitting material, the light emitted from the light source can directly pass through the rubber frame and irradiate the edge of the optical film, thereby improving the brightness of the edge of the optical film and enhancing the brightness uniformity and chromaticity uniformity of the optical film. In addition, by adding a light condensing structure to the light incident surface of the rubber frame, the light emitted from the light source can be converged into the rubber frame as much as possible and irradiate the light diffusing structure on the light exit surface. By adding a light diffusing structure to the light exit surface of the rubber frame, the light converged into the rubber frame can be dispersed by the light diffusing structure as much as possible and emitted from the light exit surface of the rubber frame at various angles, and finally irradiate the edge of the optical film, thereby improving the brightness of the edge of the optical film and enhancing the brightness uniformity and chromaticity uniformity of the optical film. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0010] Figure 1 is an exploded structural schematic diagram of a backlight module in the related art;

[0011] Figure 2 is Figure 1 a structural schematic diagram of the lower housing and the rubber frame of the backlight module in ;

[0012] Figure 3 is Figure 2 a partial enlarged view of area A in ;

[0013] Figure 4 is Figure 1 a cross-sectional structural schematic diagram of the backlight module in the assembled state in ;

[0014] Figure 5 is an exploded structural schematic diagram of a backlight module provided by an embodiment of the present disclosure;

[0015] Figure 6 is a cross-sectional structural schematic diagram of a backlight module provided by an embodiment of the present disclosure in the assembled state;

[0016] Figure 7 is Figure 6 a light path schematic diagram of the rubber frame in ;

[0017] Figure 8 isFigure 7 Optical path schematic diagram of the light condensing structure of the middle glue frame;

[0018] Figure 9 is Figure 7 Optical path schematic diagram of the light diffusing structure of the middle glue frame;

[0019] Figure 10 is a schematic cross-sectional structure diagram of another backlight module in an assembled state provided by the present disclosure;

[0020] Figure 11 is Figure 10 Optical path schematic diagram of the middle glue frame;

[0021] Figure 12 is a schematic cross-sectional structure diagram of yet another backlight module in an assembled state provided by the present disclosure;

[0022] Figure 13 is a schematic cross-sectional structure diagram of yet another backlight module in an assembled state provided by the present disclosure;

[0023] Figure 14 is a schematic structure diagram of a glue frame provided by the present disclosure;

[0024] Figure 15 is an exploded structure diagram of another backlight module provided by the present disclosure;

[0025] Figure 16 is an exploded structure diagram of a display device provided by the present disclosure.

[0026] Reference numerals:

[0027] 100 Backlight module

[0028] 110 Light source

[0029] 120 Lower housing

[0030] 121 Side wall

[0031] 122 Bottom plate

[0032] 123 Accommodating space

[0033] 130 Optical film

[0034] 131 Occluding area

[0035] 132 Light-emitting area

[0036] 133 Diffusion plate

[0037] 134 Diffusion film

[0038] 135 Prismatic film

[0039] 136 Incremental film

[0040] 140 Glue frame

[0041] 141 Condensing structure

[0042] 142 Diffusing structure

[0043] 150 Middle sheet metal

[0044] 161 First reflector

[0045] 162 Second reflector

[0046] 170 Reflector cup

[0047] 200 Display device

[0048] 210 Display panel

[0049] 220 Cover plate Detailed implementation manner

[0050] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their repetitive description will be omitted.

[0051] The terms "first", "second", and the like used in the specific description do not denote any order, quantity, or importance, but are only used to distinguish different components. In addition, in the description of this disclosure, the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, which is only for convenience of description and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of this disclosure.

[0052] It should be noted that, without conflict, the features in the embodiments of this disclosure and in different embodiments can be combined with each other.

[0053] In the related art, the direct-lit backlight module of Mini-LED (Mini-Light Emitting Diode) light source realizes the characteristics of thin, high image quality, and low power consumption of the LCD (Liquid Crystal Display) panel. At the same time, the performance level is close to that of the OLED (Organic Light Emitting Diode) display panel, and it is superior to the OLED in terms of brightness, color rendering, etc. In addition, Mini-LED backlight can be combined with fine local dimming technology to control the switching and brightness adjustment of the corresponding backlight area in real time, presenting high contrast, more vivid colors, and achieving a screen effect with high dynamic range (High Dynamic Range Imaging, HDR). However, there is still room for improvement in Mini-LED technology from the process and design levels.

[0054] Specifically, the display device in the related art may include a direct-lit backlight module of Mini-LED light source and a display module. Further, as Figure 1 , Figure 2 , Figure 3 and Figure 4 show, the backlight module 100' may include a light source 110', a lower housing 120', optical films 130', a rubber frame 140', a middle sheet metal 150', and a reflector 160'. Specifically, the light source 110' is disposed on the bottom plate inside the lower housing 120'. The rubber frame 140' is disposed inside the lower housing 120' and surrounds the periphery of the light source 110'. The rubber frame 140' is used to support the optical films 130' of the backlight module 100' and overlaps with the edges of the optical films 130'. The reflector 160' is disposed between the rubber frame 140' and the light source 110'. The middle sheet metal 150' is a hollow annular structure and is partially disposed above the optical films 130'. Due to the shielding of the part of the middle sheet metal 150' located above the optical films 130', the optical films 130' are divided into a shielding area 131' and a light-emitting area 132'. After the light emitted by the light source 110' is emitted from the light-emitting area 132' of the optical films 130', it provides backlight for the display module of the display device. And, in the direction perpendicular to the plane where the optical films 130' are located, both the rubber frame 140' and the reflector 160' overlap with the shielding area 131' of the optical films 130'. The reflector 160' is also attached to the surface of the rubber frame 140' close to the light source 110' side.

[0055] However, since in the related art, the reflector 160' is disposed between the light source 110' and the rubber frame 140', therefore, the reflector 160' will reflect the light emitted from the light source 110' to the inner side edge of the lower housing 120' back (as Figure 4As shown by the arrow in , this causes part of the light to be unable to reach the edges of the light-blocking area 131' and the light-emitting area 132' of the optical film 130', resulting in a darker edge of the light-emitting area 132' of the optical film 130' and affecting the brightness uniformity and chromaticity uniformity of the light-emitting area 132' of the optical film 130'.

[0056] Furthermore, in the related art, since the glue frame 140' is made of a non-light-guiding material, at least part of the light that is not reflected back by the reflector 160' among the light rays emitted from the light source 110' to the inner side of the lower housing 120' is absorbed or reflected back by the glue frame 140', which causes this part of the light to be unable to reach the edges of the light-blocking area 131' and the light-emitting area 132' of the optical film 130', resulting in a darker edge of the light-emitting area 132' of the optical film 130' and affecting the brightness uniformity and chromaticity uniformity of the light-emitting area 132' of the optical film 130'.

[0057] In view of this, on the one hand, as Figure 5 and Figure 6 shown, an embodiment of the present disclosure provides a backlight module 100. The backlight module 100 includes: a light source 110, a lower housing 120, an optical film 130, and a glue frame 140.

[0058] Among them, the light source 110 provides light for the backlight module 100 to pass through the optical film 130 and finally reach the display panel of the display device. There can be multiple light sources 110, and these multiple light sources 110 can be assembled into a single lamp board or arranged at the edge inside the lower housing 120. Specifically, the light source 110 can be a Mini-LED or a Micro-LED (Micro-Light Emitting Diode), and the present disclosure does not limit this.

[0059] Among them, the lower housing 120 includes a side wall 121 and a bottom plate 122 that are connected to each other. The side wall 121 and the bottom plate 122 form an accommodation space 123, and the light source 110 is located inside the accommodation space 123. Specifically, the accommodation space 123 is at least used to accommodate components such as the light source 110, the optical film 130, and the glue frame 140, and can also be used to accommodate other components of the backlight module 100. In addition, the material of the lower housing 120 can include stainless steel, and the present disclosure does not limit this. Multiple light sources 110 can be assembled on the side wall 121 of the lower housing 120.

[0060] Among them, the optical film 130 is located in the accommodation space 123 and above the light source 110. Specifically, there may be multiple optical films 130, which are sequentially stacked in the accommodation space 123 along the thickness direction of the backlight module 100. When the light source 110 is a point light source 110 such as a Mini-LED or a Micro-LED, the optical film 130 will disperse the light emitted from the point light source 110 to form a surface light source 110, and finally emit from the backlight module 100.

[0061] Among them, the glue frame 140 is located at the connection of the side wall 121 and the bottom plate 122. The optical film 130 is located above the glue frame 140, and the edge of the optical film 130 contacts the glue frame 140; the glue frame 140 includes a light-transmitting material, and the light-incident surface of the glue frame 140 close to the light source 110 has a light-condensing structure 141, and the light-emitting surface of the glue frame 140 in contact with the optical film 130 has a light-dispersing structure 142. Specifically, the glue frame 140 overlaps with the edge of the optical film 130 and is used to support the optical film 130 of the backlight module 100. The light source 110 is located between the optical film 130 and the bottom plate 122 of the lower housing 120. The light emitted by the light source 110 is emitted in all directions and irradiates the lower housing 120, the optical film 130, and the glue frame 140. Optionally, the glue frame 140 is entirely made of a light-transmitting material, and the light transmittance of the glue frame 140 is at least greater than 90%, so as to improve the light transmittance of the glue frame 140 for the light emitted from the light source 110.

[0062] Further, as Figure 6 、 Figure 7 、 Figure 8 and Figure 9 shown, the side surface of the glue frame 140 provided with the light-condensing structure 141 is the light-incident surface, and the top surface provided with the light-dispersing structure 142 is the light-emitting surface. When the light emitted from the light source 110 (as shown by the arrows in Figure 6 、 Figure 7 、 Figure 8 and Figure 9 ) irradiates the glue frame 140, part of the light will irradiate the light-condensing structure 141 on the light-incident surface of the glue frame 140 and refract into the inside of the glue frame 140. The light-condensing structure 141 will converge these lights and make these lights irradiate the light-dispersing structure 142 as much as possible. When the light inside the glue frame 140 irradiates the light-dispersing structure 142, the light-dispersing structure 142 will disperse these lights and emit from the light-emitting surface of the glue frame 140 at various angles, and finally irradiate the edge of the optical film 130.

[0063] In this embodiment, by removing the reflective sheet 160 between the light source 110 and the glue frame 140, the light emitted from the light source 110 can directly irradiate the glue frame 140 and the edge of the optical film 130, thereby improving the brightness of the edge of the optical film 130 of the backlight module 100 and enhancing the brightness uniformity and chromaticity uniformity of the optical film 130. Moreover, since the glue frame 140 is made of a light-transmitting material, the light emitted from the light source 110 can directly pass through the glue frame 140 and irradiate the edge of the optical film 130, thus improving the brightness of the edge of the optical film 130 and enhancing the brightness uniformity and chromaticity uniformity of the optical film 130. In addition, by adding a light condensing structure 141 to the light incident surface of the glue frame 140, the light emitted from the light source 110 can be condensed into the glue frame 140 as much as possible and irradiate the light diffusing structure 142 on the light exit surface. By adding a light diffusing structure 142 to the light exit surface of the glue frame 140, the light condensed into the glue frame 140 can be diffused by the light diffusing structure 142 as much as possible, and the light exits from the light exit surface of the glue frame 140 at various angles and finally irradiates the edge of the optical film 130, thereby improving the brightness of the edge of the optical film 130 and enhancing the brightness uniformity and chromaticity uniformity of the optical film 130.

[0064] Specifically, in this embodiment, by removing the reflective sheet between the light source and the glue frame and preparing the glue frame 140 with a light-transmitting material, the brightness of the optical film is increased by 300 lumens, accounting for 2.1%, and the brightness uniformity and chromaticity uniformity of the optical film are increased by 1.9%.

[0065] In some embodiments, as Figure 10 shown, the backlight module 100 further includes a middle sheet metal 150. The middle sheet metal 150 is a hollow annular structure matching the side wall 121 of the lower housing 120. The middle sheet metal 150 is fixed to the side wall 121 and at least partially located above the side wall 121. Along the direction perpendicular to the bottom plate 122, the optical film 130 has an occlusion area 131 overlapping with the middle sheet metal 150 and a light exit area 132 not overlapping with the middle sheet metal 150. The occlusion area 131 surrounds the light exit area 132. At least part of the light emitted from the light exit surface of the glue frame 140 and scattered by the light diffusing structure 142 enters the edge of the light exit area 132 of the optical film 130. Specifically, the hollow annular structure of the middle sheet metal 150 is used to enable the light emitted from the light source 110 to pass through the optical film 130 and then exit from the hollow annular structure of the middle sheet metal 150. The middle sheet metal 150 can be disposed on the upper surface and the outer surface of the side wall 121 of the lower housing 120 ( Figure 10As shown in [reference], it can also be disposed inside the accommodation space 123 of the lower housing 120. When the middle sheet metal 150 is disposed inside the accommodation space 123 of the lower housing 120, the thickness of the backlight module 100 can be reduced, which is beneficial to the thinning of the backlight module 100. In addition, the middle sheet metal 150 can also be fixedly connected to the lower housing 120 through a bayonet structure, a fixing tape, and glue. Optionally, the material of the middle sheet metal 150 may include stainless steel sheet metal, and the present disclosure does not limit this.

[0066] Further, taking Figure 10 the middle sheet metal 150 in [reference] being fixed to the side wall 121 and at least partially located above the side wall 121 as an example, since the middle sheet metal 150 generally uses an opaque stainless steel sheet metal material, the overlapping area of the optical film 130 and the middle sheet metal 150 cannot emit light outward. Therefore, the optical film 130 forms a shielding area 131 in this area, and the optical film 130 forms a light-emitting area 132 in other areas. As can be seen from the foregoing embodiments, by providing a light condensing structure 141 on the light incident surface of the glue frame 140 and a light diffusing structure 142 on the light-emitting surface, the brightness of the edge of the optical film 130 can be improved. Among them, the edge of the optical film 130 includes the edges of the shielding area 131 and the light-emitting area 132. Therefore, this embodiment can improve the brightness of the edge of the light-emitting area 132 of the optical film 130, and improve the brightness uniformity and chromaticity uniformity of the light-emitting area 132 of the optical film 130. <(

[0067] In some embodiments, continue to refer to Figure 6 and Figure 10 . Along the direction perpendicular to the bottom plate 122, the glue frame 140 overlaps with the shielding area 131 and does not overlap with the light-emitting area 132. Specifically, when looking down at the backlight module 100, the glue frame 140 is blocked by the middle sheet metal 150 and hidden below the middle sheet metal 150, including the light-emitting surface of the glue frame 140 and the light condensing structure 141. Thus, the light emitted from the light source 110 can directly irradiate the edge of the light-emitting area 132 of the optical film 130, avoiding the glue frame 140 from blocking the edge of the light-emitting area 132 of the optical film 130, increasing the proportion of direct light rays at the edge of the light-emitting area 132 of the optical film 130, further improving the brightness of the edge of the light-emitting area 132 of the optical film 130, and improving the brightness uniformity and chromaticity uniformity of the light-emitting area 132 of the optical film 130.

[0068] In some embodiments, as Figure 10 and Figure 11As shown, the backlight module 100 further includes: a first reflector 161. The first reflector 161 is located between the side surface of the glue frame 140 close to the side wall 121 and the side wall 121, and at least partially protrudes above the light-emitting surface of the glue frame 140 in a direction perpendicular to the bottom plate 122. In the direction perpendicular to the bottom plate 122, the first reflector 161 overlaps with the shielding area 131 and does not overlap with the light-emitting area 132. Specifically, in the direction perpendicular to the bottom plate 122, the first reflector 161 may only slightly protrude above the light-emitting surface of the glue frame 140, or may extend to the lower surface of the middle sheet metal 150 above the side wall 121. Further, as Figure 10 and Figure 11 shown by the arrows in, the first reflector 161 is used to reflect the light that enters the glue frame 140 but does not shoot towards the light-emitting surface of the glue frame 140, but shoots towards the side surface of the glue frame 140 close to the side wall 121, and shoots at least part of the light towards the light-diffusing structure 142 or towards the light-emitting surface of the glue frame 140. Among these lights, the light that shoots towards the light-diffusing structure 142 is scattered by the light-diffusing structure 142 and emitted from the glue frame 140 to shoot towards the edge of the light-emitting area 132 of the optical film 130, increasing the amount of light that enters the edge of the light-emitting area 132 of the optical film 130 from the light-emitting surface of the glue frame 140, further increasing the brightness of the edge of the light-emitting area 132 of the optical film 130, and improving the brightness uniformity and chromaticity uniformity of the light-emitting area 132 of the optical film 130. Among these lights, the light that shoots towards the light-emitting surface of the glue frame 140 is emitted from the light-emitting surface and at least part of it shoots towards the edge of the light-emitting area 132 of the optical film 130, which can also increase the amount of light that enters the edge of the light-emitting area 132 of the optical film 130 from the light-emitting surface of the glue frame 140. In addition, when looking down at the backlight module 100, the first reflector 161 is blocked by the middle sheet metal 150 and hidden under the middle sheet metal 150. Thus, the light emitted from the light source 110 can more directly shoot to the edge of the light-emitting area 132 of the optical film 130, avoiding the first reflector 161 from blocking the edge of the light-emitting area 132 of the optical film 130, increasing the proportion of direct light at the edge of the light-emitting area 132 of the optical film 130, further increasing the brightness of the edge of the light-emitting area 132 of the optical film 130, and improving the brightness uniformity and chromaticity uniformity of the light-emitting area 132 of the optical film 130.

[0069] In some embodiments, as Figure 12 shown, the backlight module 100 further includes: a second reflector 162. The second reflector 162 is disposed on the lower surface of the middle sheet metal 150 above the side wall 121. In the direction perpendicular to the bottom plate 122, the second reflector 162 overlaps with the glue frame 140 and the shielding area 131 respectively, and does not overlap with the light-emitting area 132. Specifically, as Figure 12As shown by the arrow in [description], the second reflector 162 is used to reflect the light rays that are emitted from the light-emitting surface of the glue frame 140 but do not shoot towards the edge of the light-emitting area 132 of the optical film 130, but instead shoot towards the lower surface of the middle sheet metal 150 above the side wall 121, and reflect at least some of these light rays into the edge of the light-emitting area 132 of the optical film 130, further improving the brightness of the edge of the light-emitting area 132 of the optical film 130, and improving the brightness uniformity and chromaticity uniformity of the light-emitting area 132 of the optical film 130. In addition, when looking down at the backlight module 100, the second reflector 162 is blocked by the middle sheet metal 150 and hidden below the middle sheet metal 150. Thus, the light rays emitted from the light source 110 can directly shoot onto the edge of the light-emitting area 132 of the optical film 130 more, avoiding the second reflector 162 from blocking the edge of the light-emitting area 132 of the optical film 130, increasing the proportion of direct light rays on the edge of the light-emitting area 132 of the optical film 130, further improving the brightness of the edge of the light-emitting area 132 of the optical film 130, and improving the brightness uniformity and chromaticity uniformity of the light-emitting area 132 of the optical film 130.

[0070] In some embodiments, as Figure 13 shown, the backlight module 100 may further include a first reflector 161 and a second reflector 162 at the same time. Among them, the settings of the first reflector 161 and the second reflector 162 may be as described above, and will not be elaborated here.

[0071] Specifically, the backlight module 100 of this embodiment that includes the first reflector 161 and the second reflector 162 at the same time can achieve all the technical effects that the backlight module 100 that separately includes the first reflector 161 or the second reflector 162 in the foregoing embodiments can achieve, and will not be elaborated here. Further, since in the direction perpendicular to the bottom plate 122, the first reflector 161 of this embodiment includes a part that is higher than the light-emitting surface of the glue frame 140, based on this part of the first reflector 161, as Figure 13 shown by the arrow in [description], the combination of the first reflector 161 and the second reflector 162 of this embodiment can also be used to reflect the light rays that are emitted from the light-emitting surface of the glue frame 140 and shoot towards this part of the first reflector 161, and at least some of these light rays are reflected into the edge of the light-emitting area 132 of the optical film 130 through two reflections of the first reflector 161 and the second reflector 162, further improving the brightness of the edge of the light-emitting area 132 of the optical film 130, and improving the brightness uniformity and chromaticity uniformity of the light-emitting area 132 of the optical film 130.

[0072] In some embodiments, continue to refer to Figure 7 and Figure 8, the light condensing structure 141 is a quarter convex lens structure arranged in multiple arrays on the light incident surface, and the convex surface of the quarter convex lens structure is convex downward and faces the light source 110. Specifically, the quarter convex lens structure can effectively achieve the function of condensing light, and then condense and direct more light rays emitted from the light source 110 towards the light diffusing structure 142. Further, the quarter convex lens structure can cover the entire side of the glue frame 140 close to the light source 110 to further improve the light condensing effect.

[0073] In some embodiments, the distance between two adjacent quarter convex lens structures arranged in an array is 1 mm to 2 mm. Specifically, the distance between two adjacent quarter convex lens structures can be any value among 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, and 2 mm, and the present disclosure does not limit this. The above setting of this embodiment can increase the overall light condensing effect of the glue frame 140 while taking into account the manufacturing difficulty of the light condensing structure 141.

[0074] In some embodiments, continue to refer to Figure 7 and Figure 8 , the light diffusing structure 142 is a plurality of hemispherical grooves recessed in the light exit surface, and the plurality of grooves are arranged in an array on the light exit surface. Specifically, the hemispherical groove structure can effectively achieve the function of dispersing light, and then disperse and direct more light rays emitted from the inside of the glue frame 140 towards the edge of the light exit area 132 of the optical film 130. Further, the hemispherical groove structure can cover the entire side of the glue frame 140 close to the light source 110 to further improve the light dispersing effect.

[0075] In some embodiments, the distance between two adjacent hemispherical groove structures arranged in an array is 1 mm to 2 mm. Specifically, the distance between two adjacent hemispherical groove structures can be any value among 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, and 2 mm, and the present disclosure does not limit this. The above setting of this embodiment can increase the overall light dispersing effect of the glue frame 140 while taking into account the manufacturing difficulty of the light diffusing structure 142.

[0076] In some embodiments, the depth of the hemispherical groove is 0.1 mm to 0.2 mm. Specifically, the depth of the hemispherical groove can be any value among 0.1 mm, 0.12 mm, 0.14 mm, 0.16 mm, 0.18 mm, or 0.2 mm, and the present disclosure does not limit this. The above setting of this embodiment can improve the light dispersing effect of the light diffusing structure 142.

[0077] In some embodiments, the light condensing structure 141 and the light diffusing structure 142 are integrally formed with the main body portion of the glue frame 140. Specifically, the glue frame 140 can be prepared by injection molding. The light condensing structure 141 and the light diffusing structure 142 can be completed simultaneously during the preparation of the glue frame 140, that is, injection molded integrally. The above arrangement in this embodiment can simplify the preparation of the glue frame 140.

[0078] In some embodiments, the light-transmitting material for making the glue frame 140 includes a light-transmitting polymer material; the light-transmitting polymer material includes one or a combination of two of polycarbonate or polymethyl methacrylate. Specifically, polycarbonate (PC plastic) is also called PC plastic, which is a high molecular polymer containing carbonate groups in the molecular chain. Polycarbonate has high strength and high transparency, and can increase the service life of the glue frame 140 while improving the transmittance of the glue frame 140.

[0079] In some embodiments, the material for making the glue frame 140 further includes a light splitting agent; the light splitting agent includes one or a combination of at least two of optical glass, optical crystal, metal thin film, interference filter, and anti-reflection coating. Specifically, the light splitting agent is used to refer to materials or material systems that can selectively separate, absorb, transmit, or reflect incident light according to the wavelength (color) of the light. The selection of the light splitting agent material for the glue frame 140 in this embodiment can improve the light converging effect of the glue frame 140 to further increase the amount of light incident on the light diffusing structure 142 from inside the glue frame 140.

[0080] In some embodiments, as Figure 14 shown, the backlight module 100 includes a plurality of mutually independent glue frames 140, and the glue frames 140 are fixed at the connection of the side wall 121 and the bottom plate 122; each glue frame 140 is a solid structure. In this embodiment, through a plurality of mutually independent glue frames 140, it is convenient for the assembly of the glue frames 140 and for matching different models of the lower housing 120, improving the versatility of the glue frames 140. In addition, compared with the hollow structure in the prior art, the solid structure of the glue frame 140 can reduce the number of light refractions inside the glue frame 140, facilitating the control of the light entering the glue frame 140 through the light condensing structure 141 and the light diffusing structure 142, and finally reaching the edge of the light emitting area 132 of the optical film 130.

[0081] In some embodiments, as Figure 6 and Figure 15As shown in the figure, the optical film sheet 130 includes at least, in a direction away from the light source 110: a diffusion plate 133, a diffusion film 134, a prism film 135, and an enhancement film 136. The diffusion plate 133 and the glue frame 140 are made of the same light-transmitting material. Specifically, when the light source 110 is a point light source 110 visible to the naked eye such as a Mini-LED or a Micro-LED, the diffusion plate 133 and the diffusion film 134 will scatter the light emitted from the point light source 110 to form a surface light source 110, and finally emit from the backlight module 100. The diffusion plate 133 also has the function of supporting the diffusion film 134, the prism film 135, and the enhancement film 136. Optionally, the thickness of the diffusion plate 133 can be set to 1.5 mm. The main function of the prism film 135 is to change the direction of the light and help guide the light to propagate in a specific direction. The enhancement film 136 is mainly used to enhance the polarization effect and reflectivity of the light and improve the energy efficiency of the light source 110. Among them, the diffusion plate 133, the diffusion film 134, the prism film 135, and the enhancement film 136 can respectively have lugs. The diffusion plate 133, the diffusion film 134, the prism film 135, and the enhancement film 136 are adhered to the glue frame 140 through the lugs, and the lugs of the four are arranged in a staggered manner to avoid mutual adhesion of the four.

[0082] In some embodiments, continuing to refer to Figure 5 and Figure 6 , the backlight module 100 further includes: a plurality of reflecting cups 170. In the assembled state of the backlight module 100, the plurality of reflecting cups 170 are respectively located between the plurality of light sources 110. The reflecting cup 170 is used to reflect the light emitted by the light source 110 to the side in a direction perpendicular to the bottom plate 122, improve the proportion of the light emitted by the light source 110 that is emitted from the light-emitting surface of the backlight module 100, play a light-gathering effect on the backlight module 100, and improve the brightness of the backlight module 100.

[0083] On the other hand, as Figure 16 shown, an embodiment of the present disclosure further provides a display device 200, including the aforementioned backlight module 100. Further, the display device 200 may further include: a display panel 210 and a cover plate 220. Among them, the cover plate 220 is used to encapsulate the display device 200 and protect the backlight module 100 and the display panel 210. Among them, the display panel 210 may be a liquid crystal display panel, and the present disclosure does not limit this. The display device 200 may be any product or component with a display function such as a vehicle-mounted display device, a mobile phone, a tablet computer, a television, a notebook computer, a digital camera, a navigator, etc. For the specific implementation manners and technical effects of the display device 200 of the present disclosure, reference may be made to the specific embodiments of the aforementioned backlight module 100, and repeated parts will not be described again.

[0084] Through the above embodiments, it can be seen that the backlight module and the display device provided by the present disclosure at least achieve the following beneficial effects:

[0085] The backlight module and display device of the present disclosure cancel the reflective sheet between the light source and the rubber frame, so that the light emitted from the light source can directly irradiate the edge of the rubber frame and the optical film, thereby improving the brightness of the edge of the optical film of the backlight module and improving the brightness uniformity and chromaticity uniformity of the optical film. Moreover, since the rubber frame includes a light-transmitting material, the light emitted from the light source can directly pass through the rubber frame and irradiate the edge of the optical film, thereby improving the brightness of the edge of the optical film and improving the brightness uniformity and chromaticity uniformity of the optical film. In addition, by adding a light condensing structure to the light incident surface of the rubber frame, the light emitted from the light source is converged into the rubber frame as much as possible and irradiates the light diffusing structure on the light exit surface. By adding a light diffusing structure to the light exit surface of the rubber frame, the light converged into the rubber frame is dispersed by the light diffusing structure as much as possible and exits the light exit surface of the rubber frame from various angles and finally irradiates the edge of the optical film, thereby improving the brightness of the edge of the optical film and improving the brightness uniformity and chromaticity uniformity of the optical film.

[0086] The above content is a further detailed description of the present disclosure in combination with specific optional embodiments, and it cannot be determined that the specific implementation of the present disclosure is only limited to these descriptions. For those of ordinary skill in the technical field to which the present disclosure pertains, without departing from the concept of the present disclosure, several simple deductions or substitutions can be made, which should all be regarded as belonging to the protection scope of the present disclosure.

Claims

1. A backlight module, characterized in that, Comprising: A light source; A lower housing, the lower housing including a side wall and a bottom plate that are connected to each other, the side wall and the bottom plate forming an accommodation space, and the light source being located within the accommodation space; An optical film, the optical film being located within the accommodation space and above the light source; A glue frame, the glue frame being located at the connection of the side wall and the bottom plate, the optical film being above the glue frame, and the edge of the optical film being in contact with the glue frame; the glue frame includes a light-transmitting material, the light-incident surface of the glue frame close to the light source has a light-concentrating structure, and the light-emitting surface of the glue frame in contact with the optical film has a light-diffusing structure.

2. The backlight module according to claim 1, wherein The backlight module further includes: A middle sheet metal, the middle sheet metal being a hollow annular structure matching the side wall of the lower housing, the middle sheet metal being fixed to the side wall and at least partially located above the side wall; In a direction perpendicular to the bottom plate, the optical film has an occlusion area overlapping with the middle sheet metal and a light-emitting area not overlapping with the middle sheet metal, and the occlusion area surrounds the light-emitting area; Among the light rays emitted from the light-emitting surface of the glue frame and scattered by the light-diffusing structure, at least part of the light rays enter the edge of the light-emitting area of the optical film.

3. The backlight module according to claim 2, wherein In a direction perpendicular to the bottom plate, the glue frame overlaps with the occlusion area and does not overlap with the light-emitting area.

4. The backlight module according to claim 2, wherein The backlight module further includes: A first reflector, the first reflector being located between the side of the glue frame close to the side wall and the side wall, and in a direction perpendicular to the bottom plate, the first reflector at least partially protrudes above the light-emitting surface of the glue frame; in a direction perpendicular to the bottom plate, the first reflector overlaps with the occlusion area and does not overlap with the light-emitting area; and / or A second reflector, the second reflector being disposed on the lower surface of the part of the middle sheet metal located above the side wall; in a direction perpendicular to the bottom plate, the second reflector overlaps with the glue frame and the occlusion area respectively, and does not overlap with the light-emitting area.

5. The backlight module according to claim 1, wherein The light-concentrating structure is a quarter convex lens structure arranged in an array on the light-incident surface, and the convex surface of the quarter convex lens structure protrudes downward and faces the light source.

6. The backlight module according to claim 5, wherein, The distance between two adjacent quarter convex lens structures arranged in an array is 1 mm to 2 mm.

7. The backlight module according to claim 1, wherein The light-diffusing structure is a plurality of hemispherical grooves recessed in the light-emitting surface, and the plurality of grooves are arranged in an array on the light-emitting surface.

8. The backlight module according to claim 7, wherein The depth of the hemispherical groove is 0.1 mm to 0.2 mm.

9. The backlight module according to claim 1, wherein The light-concentrating structure and the light-diffusing structure are integrally formed with the main body part of the glue frame.

10. The backlight module according to claim 1, wherein The light-transmitting material for making the glue frame includes a light-transmitting polymer material; the light-transmitting polymer material includes one or a combination of two of polycarbonate or polymethyl methacrylate.

11. The backlight module according to claim 1, wherein, The material for making the glue frame further includes a light-splitting agent; the light-splitting agent includes one or a combination of at least two of optical glass, optical crystal, metal thin film, interference filter, and antireflection coating.

12. The backlight module according to claim 1, wherein, The backlight module includes a plurality of mutually independent glue frames, and the glue frames are fixed at the connection of the side wall and the bottom plate; each glue frame is a solid structure.

13. The backlight module according to claim 1, wherein The optical film sheet includes, at least in a direction away from the light source: a diffusion plate, a diffusion film, a prism film, and an enhancement film; The diffusion plate is made of the same light-transmissive material as the glue frame.

14. A display device, characterized in that, A backlight module according to any one of claims 1 to 13 is included.

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