Backlight module and display device

Abstract

The embodiment of the invention provides a backlight module and a display device.The backlight module comprises a shell, a back plate and a rubber frame connected with the back plate, the rubber frame comprises four side plates connected end to end, and the back plate and the rubber frame jointly define a containing space; the lamp panel is arranged in the containing space and comprises a substrate, the substrate is fixed to the inner surface of the back plate, a gap is formed between the substrate and the rubber frame, and a plurality of light-emitting elements are arranged on the surface of the side, away from the back plate, of the substrate; the reflecting material layer comprises a first reflecting layer and a second reflecting layer; the first reflecting layer covers a partial area of one side, deviating from the back plate, of the substrate, and the second reflecting layer at least covers a frame area, located between the lamp panel and the rubber frame, of the inner surface of the back plate. The second reflecting layer can compensate the brightness of the peripheral edge part of the backlight module, so that the brightness value of the edge part is improved, the condition that the periphery of a display picture is darkened is improved, and the display quality is improved.

Description

Technical Field

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

[0002] With the development of electronic technology and the improvement of consumers' requirements for display screen size and picture quality, liquid crystal display screens have become the mainstream development trend in the industry. Among them, the backlight modules in liquid crystal display screens usually include edge-lit backlight modules and direct-lit backlight modules. Compared with edge-lit backlight modules, direct-lit backlight modules can greatly improve display brightness and color display effects.

[0003] In the related art, a direct-type backlight module generally includes a back panel and a light board fixed on the back panel. The light board is the light source of the entire backlight module. A plurality of light emitting diodes (LEDs) are arranged on the surface of the light board. In order to increase the brightness, a reflective material is also arranged on the light-emitting surface of the light board, such as printed white oil or attached reflective tape, etc. An optical film material is also arranged on the light-emitting side of the light board. The optical film material is used to adjust the light emitted by the light board to improve the light-emitting effect.

[0004] However, when the backlight module in the related art is applied to a liquid crystal display screen, the surroundings of the display screen may be dark or even black, resulting in a poor display effect. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a backlight module and a display device to increase the brightness around the display screen and improve the display effect. The specific technical solution is as follows:

[0006] An embodiment of the first aspect of the present application provides a backlight module, including a shell, a back panel and a rubber frame connected to the back panel, the rubber frame including four side panels connected end to end, the back panel and the rubber frame jointly define a accommodating space; a light board, arranged in the accommodating space, the light board including a substrate, the substrate is fixed to the inner surface of the back panel, and there is a gap between the substrate and the rubber frame, and a plurality of light-emitting elements are arranged on the surface of the substrate away from the back panel; an optical film material is located on the side of the light board away from the back panel; a reflective material layer, including a first reflective layer and a second reflective layer; the first reflective layer covers a partial area of ​​the substrate on the side away from the back panel, and the second reflective layer covers at least a border area of ​​the inner surface of the back panel located between the light board and the rubber frame.

[0007] In some embodiments of the present application, a surface of the substrate on one side away from the back plate has a first area and a second area, the second area surrounds the first area, the light-emitting element is located in the first area, the first reflective layer covers the first area, and the first reflective layer is provided with a first via hole for allowing the light-emitting element to pass through.

[0008] In some embodiments of the present application, the substrate is made of a light-transmitting material, the second reflective layer extends in a direction away from the plastic frame, and covers a portion of the inner surface of the back panel corresponding to the light panel.

[0009] In some embodiments of the present application, the side of the second reflective layer away from the plastic frame is located between the outermost circle of light-emitting elements of the light board and the edge of the substrate, and the outermost circle of light-emitting elements is the light-emitting element closest to the edge of the substrate.

[0010] In some embodiments of the present application, in a thickness cross section of the backlight module, a side of the second reflective layer away from the plastic frame is collinear with an edge of the first reflective layer.

[0011] In some embodiments of the present application, the second reflective layer also covers at least a portion of the second region, and the second reflective layer extends from the edge of the substrate toward the center of the substrate.

[0012] In some embodiments of the present application, the second reflective layer extends in a direction close to the center of the substrate until it contacts an edge of the first reflective layer, or a preset gap is formed between the second reflective layer and the edge of the first reflective layer.

[0013] In some embodiments of the present application, a diffusion structure is arranged outside the light-emitting element; the second reflective layer also covers a portion of the first reflective layer, the second reflective layer extends from the edge of the substrate in a direction close to the center of the substrate, and overlaps the side of the first reflective layer facing away from the substrate.

[0014] In some embodiments of the present application, the second reflective layer extends along a direction close to the center of the substrate to between the edge of the first reflective layer and the diffusion structure of the light-emitting element in the outermost circle.

[0015] In some embodiments of the present application, at least a portion of the second reflective layer extends along a direction close to the center of the substrate to between the diffusion structure of the light-emitting element in the outermost circle and the diffusion structure of the adjacent light-emitting element, and the second reflective layer is provided with a second via hole, and the second via hole is used for allowing the diffusion structure of the light-emitting element to pass through.

[0016] In some embodiments of the present application, the second reflective layer further covers the outer peripheral surface of the substrate, and the portion of the second reflective layer covering the outer peripheral surface of the substrate is connected to the portion covering the inner surface of the back plate and the portion covering the second region of the substrate.

[0017] In some embodiments of the present application, a bonding area is provided on one side of the light guide plate, and the backlight module further includes an FPC. One end of the FPC is connected to the bonding area, and the other end of the FPC is used to connect to a control circuit; a break is formed in the portion of the second reflective layer corresponding to the bonding area.

[0018] In some embodiments of the present application, the material of the second reflective layer is white oil.

[0019] In some embodiments of the present application, the material of the second reflective layer is a reflective tape.

[0020] In an embodiment of the present application, the backlight module includes a housing, and the housing is used to form a main support frame of the backlight module. The housing includes a back plate and a rubber frame, and the back plate and the rubber frame jointly define an accommodation space for placing components such as a light guide plate and optical film materials. The light guide plate includes a substrate and a plurality of light-emitting elements disposed on the substrate. By providing the light guide plate, a light source can be provided for the backlight module. The optical film material is disposed on the light-emitting side of the light guide plate. By providing the optical film material, the light emitted by the light guide plate can be modulated to improve the light-emitting effect of the backlight module. A portion of the area on the side of the light guide plate facing away from the back plate is covered with a first reflective layer, and the first reflective layer can reflect light to increase the number of outgoing light rays and improve the light efficiency. Different from the related art, in the embodiment of the present application, the reflective material layer includes not only the first reflective layer but also the second reflective layer. The second reflective layer at least covers the border area between the light guide plate and the rubber frame on the inner surface of the back plate. By providing the second reflective layer, the refraction and reflection paths of light in the border area can be increased, the light efficiency utilization can be improved, and the light falling on the border area of the back plate can be emitted toward the light-emitting side of the backlight module through refraction or reflection, so that the brightness of the four peripheral parts of the backlight module can be compensated, the brightness value of the peripheral parts can be increased, and further it is beneficial to improve the situation that the four sides of the display picture are dark and improve the display quality.

[0021] An embodiment of the second aspect of the present application provides a display device, including the backlight module of any embodiment of the first aspect. Since it has the backlight module of any embodiment of the first aspect, therefore, it also has the beneficial effects of any embodiment of the first aspect, and the present application will not elaborate herein.

[0022] Of course, implementing any product or method of the present application does not necessarily require achieving all the above-mentioned advantages simultaneously. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can also obtain other embodiments based on these drawings.

[0024] Figure 1a Schematic cross-sectional view of a backlight module in the thickness direction of the related art;

[0025] Figure 1b For Figure 1a Enlarged schematic view of part F1 in

[0026] Figure 2 For Figure 1a Top view of the lamp board of the backlight module shown in

[0027] Figure 3a Schematic cross-sectional view of the backlight module according to the first embodiment of the first aspect of the present application in the thickness direction;

[0028] Figure 3b For Figure 3a Enlarged schematic view of part F2 in

[0029] Figure 3c For Figure 3b Light effect schematic diagram of

[0030] Figure 4a For Figure 3a Split schematic view of the backlight module shown in

[0031] Figure 4b For Figure 4a Schematic diagram of the planar shape of the second reflective layer of the backlight module shown in from a top view angle;

[0032] Figure 5 For Figure 3a Schematic diagram of the structure of the reflective tape used for the second reflective layer of the backlight module shown in ;

[0033] Figure 6a Schematic cross-sectional view of the backlight module according to the second embodiment of the first aspect of the present application in the thickness direction;

[0034] Figure 6b For Figure 6a Enlarged schematic view of part F3 in

[0035] Figure 6c For Figure 6b Light effect schematic diagram of

[0036] Figure 7a For Figure 6a Partial cross-sectional view of the second reflective layer of the backlight module shown in in the thickness direction;

[0037] Figure 7b is Figure 6a a schematic plan view of the second reflective layer in the backlight module shown in the flattened state;

[0038] Figure 8a is a schematic cross-sectional view of the backlight module according to the third embodiment of the first aspect of the present application in the thickness direction;

[0039] Figure 8b is Figure 8a an enlarged schematic view of the F4 part in;

[0040] Figure 9a is a schematic cross-sectional view of the backlight module according to the fourth embodiment of the first aspect of the present application in the thickness direction;

[0041] Figure 9b is Figure 9a an enlarged schematic view of the F5 part of;

[0042] Figure 10a is Figure 9a a positioning schematic diagram of the second reflective layer and the diffusion structure in the backlight module shown in the flattened state;

[0043] Figure 10b is Figure 10a a partial enlarged schematic view of;

[0044] Figure 11 is a positioning schematic diagram of the second reflective layer and the diffusion structure in the backlight module according to the fifth embodiment of the first aspect of the present application in the flattened state;

[0045] Figures 1a to 2 In: backlight module 90; lamp board 91; LED 910; reflective material 92; unprinted area 93;

[0046] Figures 3a to 11 In: backlight module 10; housing 100; back plate 110; border area 111; rubber frame 120; lamp board 200; substrate 210; first area 211; second area 212; light-emitting element 220; diffusion structure 230; reflective material layer 300; first reflective layer 310; second reflective layer 320; second via 321; fracture 322; reflective tape 323; adhesive layer 3231; reflective layer 3232; optical film material 400; fixing tape 500; FPC 600; light E. Detailed implementation manners

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art based on the present application belong to the scope of protection of the present application.

[0048] As described in the background art, after the backlight module in the related art is applied to the liquid crystal display screen, there is a situation where the periphery of the display screen is dark or even black, and the display effect is poor.

[0049] Specifically, refer to Figures 1a to 2 , where Figure 1a is a schematic cross-sectional view of the backlight module 90 in the related art in the thickness direction; Figure 1b is Figure 1a an enlarged schematic view of part F1 in Figure 2 is Figure 1a a top view of the lamp board 91 of the backlight module 90 shown in

[0050] The inventors noticed that in the backlight module 90 of the related art, due to limitations in the process level, such as factors such as the cutting, grinding of the lamp board substrate, and the avoidance tolerance of the reflective material 92, as Figures 1a to 2 shown, the reflective material 92, such as white oil, can only be printed on a part of the light-emitting surface of the lamp board 91 and cannot cover the entire light-emitting surface of the lamp board 91. Since there is an unprinted area 93 between the edge of the white oil and the edge of the lamp board 91, the light loss at the edge part of the lamp board 91 is relatively high, and the brightness is relatively low, resulting in the periphery of the display screen being dark or even black.

[0051] In view of this, refer to Figures 3a to 3c , where Figure 3a is a schematic cross-sectional view of the backlight module 10 in the first aspect, Embodiment 1 of the present application in the thickness direction; Figure 3b is Figure 3a an enlarged schematic view of part F2 in Figure 3c is Figure 3b a light effect schematic view of

[0052] As Figures 3a to 3cAs shown, the first embodiment of the first aspect of the present application provides a backlight module 10, and the backlight module 10 includes a housing 100, a lamp panel 200, an optical film material 400, and a reflective material layer 300. Among them, the housing 100 includes a back panel 110 and a rubber frame 120 connected to the back panel 110, and the rubber frame 120 includes four side panels connected end to end, and the back panel 110 and the rubber frame 120 jointly define a storage space. The lamp panel 200 is arranged in the storage space, and the lamp panel 200 includes a substrate 210, and the substrate 210 is fixed to the inner surface of the back panel 110, and there is a gap between the substrate 210 and the rubber frame 120, and a plurality of light-emitting elements 220 are arranged on the side surface of the substrate 210 away from the back panel 110. The optical film material 400 is located on the side of the lamp panel 200 away from the back panel 110. The reflective material layer 300 includes a first reflective layer 310 and a second reflective layer 320 ; the first reflective layer 310 covers a portion of the substrate 210 away from the back plate 110 , and the second reflective layer 320 at least covers the frame area 111 on the inner surface of the back plate 110 between the light board 200 and the rubber frame 120 .

[0053] In the embodiment of the present application, the backlight module 10 includes a housing 100, which is used to form the main support frame of the backlight module 10. The housing 100 includes a back plate 110 and a plastic frame 120. The back plate 110 and the plastic frame 120 together define a storage space for placing components such as a light board 200 and an optical film material 400. The light board 200 includes a substrate 210 and a plurality of light-emitting elements 220 arranged on the substrate 210. By arranging the light board 200, a light source can be provided for the backlight module 10. The optical film material 400 is arranged on the light-emitting side of the light board 200. By arranging the optical film material 400, the light emitted by the light board 200 can be modulated to improve the light-emitting effect of the backlight module 10. A partial area of ​​the light board 200 on the side away from the back plate 110 is covered with a first reflective layer 310, and the first reflective layer 310 can reflect light to increase the number of emitted light and improve the light effect. Different from the related art, in the embodiment of the present application, the reflective material layer 300 includes not only the first reflective layer 310, but also the second reflective layer 320. The second reflective layer 320 at least covers the frame area 111 of the inner surface of the back plate 110 between the light board 200 and the plastic frame 120. Figure 3c As shown, by setting the second reflective layer 320, the refraction and reflection path of the light E in the frame area 111 can be increased, thereby improving the light efficiency, so that the light E falling on the frame area 111 of the back panel 110 is refracted or reflected and then emitted toward the light-emitting side of the backlight module 10, thereby compensating for the brightness of the edge parts around the backlight module 10 and improving the brightness value of the edge parts, which is beneficial to improving the dark situation around the display screen and improving the display quality.

[0054] In addition, it should be noted that for the above technical problem, that is, the darkening around the display screen, in the related art, solutions such as expanding the position of the LED 910 provided on the lamp board 91 outward beyond the edge of the lamp board 91 and changing the color of the housing of the backlight module 90 from dark to light are adopted for improvement. However, the improvement solutions in the related art have problems such as large modifications to the lamp board 91, high costs, insignificant improvement effects, and high processing requirements.

[0055] In the embodiment of the present application, by adding a second reflective layer 320 and covering at least the border area 111 between the lamp board 200 and the rubber frame 120 on the inner surface of the back plate 110 with the second reflective layer 320, the reflectivity of the border area 111 of the back plate 110 can be increased to more than 96%, the brightness at the edge of the backlight module 10 can be enhanced, the situation of darkening around the display screen can be effectively improved, and there is no need to modify the lamp board 200 and other components, with low costs and simple operation processes, which is convenient for application in the improvement of existing backlight module products.

[0056] In the first embodiment, the back plate 110 can be made of a metal material. As Figures 3a to 3c shown, the substrate 210 can be fixed on the inner surface of the back plate 110 through a fixing tape 500, and the fixing tape 500 can play a role in fitting and alignment as well as fixing. One side surface of the substrate 210 away from the back plate 110 has a first area 211 and a second area 212, the second area 212 surrounds the first area 211, the light-emitting element 220 is located in the first area 211, the first reflective layer 310 covers the first area 211, and a first through hole for the light-emitting element 220 to pass through is provided on the first reflective layer 310.

[0057] Considering the existing process level, in the embodiment of the present application, the substrate 210 is divided into a first area 211 and a second area 212, and the first reflective layer 310 only covers the first area 211 of the substrate 210. Thus, it is convenient to process the first reflective layer 310. The first reflective layer 310 can reflect the light entering the first area 211 and improve the light efficiency. The material of the first reflective layer 310 can be white oil, and it can be formed on the first area 211 of the substrate 210 through a screen printing process.

[0058] Considering the requirements such as substrate 210 cutting and wiring design, the light-emitting element 220 is arranged in the first area 211, and there is a preset distance between the light-emitting element 220 and the edge of the substrate 210. The light-emitting element 220 can be a common LED lamp or a mini LED lamp, etc. A mini LED lamp refers to an LED lamp with a smaller unit size, and the interval between each lamp is smaller, usually less than 1 mm. In addition, a first through hole is provided on the first reflective layer 310, and the first through hole corresponds to the light-emitting element 220 one by one. Thus, it can avoid blocking the light-emitting element 220.

[0059] In Embodiment 1, the substrate 210 may be made of a light-transmitting material. Preferably, the substrate 210 is made of glass. Glass has high flatness, low thermal shrinkage, and high reliability, and has little influence on the material of the second reflective layer 320, and does not affect the overall reliability of the backlight module 10.

[0060] As Figures 3a to 3c shown, in Embodiment 1, in addition to covering the border area 111 on the inner surface of the back plate 110, the second reflective layer 320 also extends in a direction away from the glue frame 120 and covers a part of the area on the inner surface of the back plate 110 corresponding to the lamp board 200. Considering that the substrate 210 is made of a light-transmitting material, in practical applications, a part of the light at the edge of the lamp board 200 can pass through the substrate 210 and enter the inner surface of the back plate 110. Therefore, in the embodiment of the present application, the second reflective layer 320 is extended in a direction away from the glue frame 120 and covers a part of the area on the inner surface of the back plate 110 corresponding to the lamp board 200, that is, a part of the second reflective layer 320 is extended between the inner surface of the back plate 110 and the lamp board 200. Thus, a part of the light at the edge of the lamp board 200 can enter the second reflective layer 320 and be reflected by the second reflective layer 320 after passing through the substrate 210, thereby further improving the light efficiency at the edge of the lamp board 200.

[0061] Further, in Embodiment 1, the side of the second reflective layer 320 away from the glue frame 120 is located between the outermost light-emitting element 220 of the lamp board 200 and the edge of the substrate 210. As Figure 3b shown, the border width (hereinafter referred to as the side width) of the second reflective layer 320 is dimension A, the distance between the substrate 210 and the glue frame 120 is B, the distance between the edge of the first reflective layer 310 and the edge of the substrate 210, that is, the side width of the second area 212 is D, and the distance between the outermost light-emitting element 220, that is, the light-emitting element 220 closest to the edge of the lamp board 200 and the edge of the substrate 210 is E1, and B ≤ A ≤ E1 + B. Thus, both material can be saved and cost can be reduced, and the light efficiency at the edge can be effectively improved.

[0062] In a preferred embodiment, as Figure 3cAs shown, on the thickness cross-section of the backlight module 10, the side of the second reflective layer 320 away from the rubber frame 120 is collinear with the edge of the first reflective layer 310, that is, A = D + B. Considering that the part between the outermost light-emitting elements 220 and the edge of the first reflective layer 310 will be covered by the first reflective layer 310, most of the light falling on this area will be reflected by the first reflective layer 310, and very little light will enter the inner surface of the backplane 110 through the substrate 210. Therefore, making the side of the second reflective layer 320 away from the rubber frame 120 collinear with the edge of the first reflective layer 310 can, while ensuring the light effect at the edge of the backlight module 10, minimize costs to the greatest extent.

[0063] See Figure 4a and Figure 4b , where Figure 4a is Figure 3a a split schematic diagram of the backlight module 10 shown; Figure 4b is Figure 4a a schematic diagram of the planar shape of the second reflective layer 320 in the backlight module 10 shown from a top view angle.

[0064] As Figure 4a and Figure 4b shown, in the embodiment of the present application, a bonding area is provided on one side of the lamp board 200. The backlight module 10 further includes an FPC600 (Flexible Printed Circuit), one end of the FPC600 is connected to the bonding area, and the other end is connected to a control circuit. Thus, the control of the lamp board 200 can be achieved. Further, a break 322 is formed in the part of the second reflective layer 320 corresponding to the bonding area. Since the light falling into the bonding area is blocked by the FPC600 and cannot enter the second reflective layer 320, setting a break 322 at the corresponding position of the bonding area can not only save materials but also avoid the bonding area of the FPC600.

[0065] In a specific embodiment, as Figure 4b shown, the total length of the second reflective layer 320 is L, and the total width is W. The length of the substrate 210 is L1, and the width of the substrate 210 is W1, L = L1 + 2×B. The width of the substrate 210 is W1, W = W1 + 2×B. It should be noted that the gap sizes between the substrate 210 and the rubber frame 120 in the length direction of the backlight module 10 and in the width direction of the backlight module 10 can be different, and the present application does not limit this.

[0066] In the first embodiment, the second reflective layer 320 can be processed before the backplane 110 is received, or processed before the lamp board 200 is attached.

[0067] ​The material of the second reflective layer 320 can be white oil or a reflective tape 323. In practical applications, the material can be selected according to the size of the backlight module 10.

[0068] Specifically, when the size of the backlight module 10 is small, for example, less than 20 inches, as Figure 3b shown, the thickness C1 of the fixing tape 500 between the substrate 210 and the inner surface of the back plate 110 is usually thin, generally less than or equal to 50 mm. This results in a small distance between the substrate 210 and the back plate 110 in the thickness direction of the backlight module 10. Considering that, in the first embodiment, a part of the second reflective layer 320 needs to penetrate between the substrate 210 and the back plate 110. If the second reflective layer 320 uses a reflective tape 323, it will be difficult to attach the reflective tape 323 in the area between the substrate 210 and the back plate 110. Therefore, for a backlight module 10 with a small size, preferably, the material of the second reflective layer 320 is white oil. The white oil can be thermosetting, and the reflectivity of the thermosetting white oil is greater than or equal to 92%, and the reflection performance is better. In the actual process, the second reflective layer 320 can be formed on the border area 111 of the inner surface of the back plate 110 and a part of the area corresponding to the lamp board 200 by printing white oil, and the thickness C2 of the second reflective layer 320 is less than or equal to the thickness C1 of the fixing tape 500. In practical applications, a special screen can be made to form the second reflective layer 320 by one-piece printing. Thus, the printing efficiency is high and the accuracy is high.

[0069] For a backlight module 10 with a large size, for example, greater than 20 inches, the thickness of the fixing tape 500 between the substrate 210 and the inner surface of the back plate 110 can reach more than 50 mm. At this time, the second reflective layer 320 can be formed by attaching a reflective tape 323. The reflective tape 323 can be a single-sided adhesive.

[0070] See Figure 5 , Figure 5 For Figure 3a the schematic structural diagram of the reflective tape 323 used in the second reflective layer 320 in the backlight module 10 shown.

[0071] As Figure 5 shown, the reflective tape 323 includes an adhesive layer 3231 and a reflective layer 3232. The color of the reflective layer 3232 can be white or silver. The reflectivity of the white reflective layer can be greater than or equal to 96%, and the reflectivity of the silver reflective layer can be greater than or equal to 98%. The reflective tape 323 has a reflectivity 16% higher than that of the original inner surface of the back plate 110, and the reflection effect is better. In practical applications, the color of the reflective tape 323 can be selected according to the actual verification effect. Thus, it can be ensured that the reflectivity of the second reflective layer 320 is high and the reflection performance is good.

[0072] Optionally, the second reflective layer 320 is an integral reflective tape 323, and the second reflective layer 320 is formed by integral attachment; alternatively, the second reflective layer 320 includes a plurality of spliced tape segments, and the second reflective layer 320 is formed by spliced attachment. The present application does not limit this. Additionally, in practical applications, an attachment alignment fixture can be fabricated to achieve automatic attachment, and thus, the attachment efficiency is relatively high.

[0073] As Figures 3a to 3c shown, in the first embodiment, a diffusion structure 230 can be provided outside the light-emitting element 220. The diffusion structure 230 is used to diffuse the light emitted by the light-emitting element 220 to increase the light-emitting range. The diffusion structure 230 can be encapsulation glue wrapped outside the light-emitting element 220, or can be a diffusion lens covering the outside of the light-emitting element 220. The present application does not limit this.

[0074] In the first embodiment, the optical film material 400 can include film sheets such as a diffusion plate, a light homogenizing film, a quantum dot film, and a brightness enhancement film. Thus, the optical film material 400 can modulate light and further improve the light efficiency. In practical applications, the number of layers, thickness, and type of the film sheets can be determined according to the optical effect. The present application does not limit this.

[0075] Refer to Figures 6a to 6c , where Figure 6a is a schematic cross-sectional view of the backlight module 10 in the thickness direction according to the second embodiment of the first aspect of the present application; Figure 6b is Figure 6a an enlarged schematic view of the F3 part in Figure 6c is Figure 6b a light efficiency schematic view of

[0076] As Figures 6a to 6c shown, in the second embodiment, different from the first embodiment, the second reflective layer 320 does not cover a part of the inner surface of the back plate 110 corresponding to the lamp board 200, that is, the second reflective layer 320 does not extend between the back plate 110 and the lamp board 200. The second reflective layer 320 also covers at least a part of the second region 212, and the second reflective layer 320 extends from the edge of the substrate 210 towards the center of the substrate 210. By covering a part of the second region 212 with the second reflective layer 320, the light falling on the second region 212 can be reflected by the second reflective layer 320, thereby increasing the number of outgoing light rays and further enhancing the brightness at the edge of the backlight module 10.

[0077] Specifically, as Figure 6b shown, the second reflective layer 320 can extend towards the center of the substrate 210 until it contacts the edge of the first reflective layer 310. Thus, the second reflective layer 320 can reflect all the light falling on the second region 212, thereby maximizing the light efficiency.

[0078] In other embodiments of the present application, the second reflective layer 320 may also extend in a direction close to the center of the substrate 210 to have a preset gap with the edge of the first reflective layer 310. The present application does not limit this, and in the actual manufacturing process, the size of the gap between the second reflective layer 320 and the first reflective layer 310 may be determined in combination with factors such as process and material.

[0079] Preferably, in the second embodiment, the thickness of the first reflective layer 310 is C3, the height of the diffusion structure 230 is C4, and the thickness C2 of the second reflective layer 320 is greater than or equal to the thickness C3 of the first reflective layer 310, and less than or equal to the height C4 of the diffusion structure 230, that is, C3≤C2≤C4. By making the thickness of the second reflective layer 320 greater than or equal to the thickness of the first reflective layer 310, it is possible to avoid the formation of shadows in the area of ​​the second reflective layer 320 close to the first reflective layer 310. By making the thickness of the second reflective layer 320 less than or equal to the height of the diffusion structure 230, it is possible to avoid the second reflective layer 320 affecting the diffusion effect of light.

[0080] In the second embodiment, the second reflective layer 320 also covers the outer peripheral surface of the substrate 210 , and the portion of the second reflective layer 320 covering the outer peripheral surface of the substrate 210 is connected to the portion covering the inner surface of the back plate 110 and the portion covering the second region 212 of the substrate 210 .

[0081] See also Figure 7a and Figure 7b ,in, Figure 7a for Figure 6a A partial cross-sectional schematic diagram of the second reflective layer 320 in the backlight module 10 in the thickness direction; Figure 7b for Figure 6a The diagram shows the planar shape of the second reflective layer 320 in the backlight module 10 in a flattened state.

[0082] The material of the second reflective layer 320 is a reflective tape 323, such as Figure 7a As shown, the reflective tape 323 is step-shaped, so that the second reflective layer 320 with a height difference can be produced through a one-time attachment process, so that the second reflective layer 320 can cover both the second area 212 and the frame area 111 on the inner surface of the back panel 110.

[0083] Preferably, if Figure 6b As shown, in the second embodiment, the side width of the second reflective layer 320 covering the substrate 210 away from the back plate 110 is D2, and D2 is greater than or equal to 1 mm, thereby ensuring the attachment effect and preventing the reflective tape 323 from warping. Figure 7b As shown, in the flattened state, the side width of the second reflective layer 320 is A=D2+D1+B.

[0084] As Figure 6b and Figure 7b shown, the height of the substrate 210 is D1, the total length L of the second reflective layer 320 is L = L1 + 2×(B + D1), and the total width is W = W1 + 2×(B + D1).

[0085] See Figure 8a and Figure 8b , wherein, Figure 8a is a schematic cross-sectional view of the backlight module 10 according to the third embodiment of the first aspect of the present application in the thickness direction; Figure 8b is Figure 8a an enlarged schematic view of the F4 part in

[0086] As Figure 8a and Figure 8b shown, in the third embodiment, different from the second embodiment, the second reflective layer 320 also covers a part of the first reflective layer 310. The second reflective layer 320 extends from the edge of the substrate 210 in the direction close to the center of the substrate 210 and overlaps on the side of the first reflective layer 310 facing away from the substrate 210, that is, the edge width D2 of the second reflective layer 320 covering the side of the substrate 210 facing away from the backplane 110 is greater than the edge width D of the second region 212. Thus, the attachment reliability of the second reflective layer 320 on the surface of the substrate 210 can be improved, the flanging can be prevented, and the reliability risk can be reduced.

[0087] Specifically, considering that in the actual manufacturing process of the lamp board 200, affected by various factors such as process and wiring, the edge width D of the second region 212 may be relatively narrow, less than 1 mm. At this time, by overlapping the second reflective layer 320 on the side of the first reflective layer 310 facing away from the substrate 210, the attachment reliability of the second reflective layer 320 in the second region 212 can be ensured, the flanging can be prevented, and the reliability risk can be reduced.

[0088] Furthermore, the distance between the edge of the diffusion structure 230 of the outermost light-emitting element 220 and the edge of the lamp board 200 is E2. The second reflective layer 320 extends in the direction close to the center of the substrate 210 to between the edge of the first reflective layer 310 and the diffusion structure 230 of the outermost light-emitting element 220, that is, D < D2 ≤ E2. Thus, both the attachment reliability of the second reflective layer 320 can be improved, and the second reflective layer 320 can be prevented from being adhered to the diffusion structure 230, affecting the diffusion effect.

[0089] See Figures 9a to 10b , wherein, Figure 9a is a schematic cross-sectional view of the backlight module 10 according to the fourth embodiment of the first aspect of the present application in the thickness direction; Figure 9b is Figure 9a an enlarged schematic view of the F5 part of Figure 10a is Figure 9aSchematic diagram of the positioning of the second reflective layer 320 in the backlight module 10 shown in the flattened state with respect to the diffusion structure 230; Figure 10b is Figure 10a partial enlarged schematic diagram.

[0090] As Figures 9a to 10a shown, in the fourth embodiment, different from the third embodiment, the second reflective layer 320 extends in the direction close to the center of the substrate 210 to between the diffusion structures 230 of the outermost ring of light-emitting elements 220 and the diffusion structures 230 of adjacent light-emitting elements 220. The second reflective layer 320 is provided with a second via 321 for the diffusion structure 230 of the light-emitting element 220 to pass through. Thereby, when the size of the second region 212 is small, the adhesion reliability of the second reflective layer 320 can be further improved. In addition, by providing the second via 321, not only can the diffusion structure 230 be avoided, but also a positioning function can be achieved during the adhesion process of the second reflective layer 320, improving the positioning accuracy.

[0091] Specifically, as Figure 10b shown, the diameter of the diffusion structure 230 is Φ1, and the diameter of the second via 321 is Φ2, where Φ2 ≥ Φ1 + 1.2 mm.

[0092] Further, in the direction close to the center of the substrate 210, the distance between the outermost ring of light-emitting elements 220 and adjacent light-emitting elements 220 is X, and the distance between the edge of the second reflective layer 320 close to the center of the substrate 210 and the edge of the second via 321 is D3, 0.5×Φ2 ≤ D3 ≤ (X - φ1)×(0.6 - 0.8). Along the circumferential direction of the substrate 210, the distance between adjacent light-emitting elements 220 is Y, and the distance between the edges of adjacent second vias 321 is D4, 0.5×Φ2 ≤ D4 ≤ (Y - Φ1)×(0.6 - 0.8). The distance between the edge of the second reflective layer 320 far from the center of the substrate 210 and the edge of the second via 321 is A1, A1 ≤ E2 + B + D1, and the edge width A of the second reflective layer 320 = A1 + Φ2 + D3. In practical applications, the respective dimensions and spacing values of the second reflective layer 320 can be adjusted according to the size and arrangement between adjacent diffusion structures 230. The present application does not limit this.

[0093] See Figure 11 , Figure 11 is the schematic diagram of the planar shape of the second reflective layer 320 of the backlight module 10 according to the fifth embodiment of the first aspect of the present application in the flattened state.

[0094] As Figure 11As shown, in the fifth embodiment, different from the fourth embodiment, only a part of the second reflective layer 320 extends in the direction close to the center of the substrate 210 to between the diffusion structures 230 of the outermost light-emitting elements 220 and the diffusion structures 230 of adjacent light-emitting elements 220, and another part of the second reflective layer 320 extends in the direction close to the center of the substrate 210 to between the edge of the first reflective layer 310 and the diffusion structures 230 of the outermost light-emitting elements 220. Thus, the local positioning of the second reflective layer 320 can be performed according to the actual attachment effect and the specific product size, so that it can not only play a positioning role and improve the attachment effect, but also save materials.

[0095] In other embodiments of the present application, for the case where the size of the backlight module 10 is relatively large and the edge of the second region 212 is relatively narrow, the second reflective layer 320 can be extended in the direction close to the center of the substrate 210 to between the diffusion structures 230 of the light-emitting elements 220 in the penultimate circle and the diffusion structures 230 of the light-emitting elements 220 in the third-to-last circle; the light-emitting elements 220 in the penultimate circle refer to the light-emitting elements 220 adjacent to the outermost light-emitting elements 220 in the direction close to the center of the substrate 210, and the light-emitting elements 220 in the third-to-last circle refer to the light-emitting elements 220 adjacent to the light-emitting elements 220 in the penultimate circle in the direction close to the center of the substrate 210. Thus, while improving the attachment reliability of the second reflective layer 320, the edge brightness of the display module can be further enhanced.

[0096] An embodiment of the second aspect of the present application provides a display device, including the backlight module 10 of any embodiment of the first aspect.

[0097] The display device of the embodiment of the present application includes a backlight module 10, and the backlight module 10 includes a housing 100. The housing 100 is used to form the main support frame of the backlight module 10. The housing 100 includes a back plate 110 and a rubber frame 120. The back plate 110 and the rubber frame 120 jointly define an accommodation space for placing components such as a lamp board 200 and an optical film 400. The lamp board 200 includes a substrate 210 and a plurality of light-emitting elements 220 disposed on the substrate 210. By providing the lamp board 200, a light source can be provided for the backlight module 10. The optical film 400 is disposed on the light-emitting side of the lamp board 200. By providing the optical film 400, the light emitted by the lamp board 200 can be modulated to improve the light-emitting effect of the backlight module 10. A part of the region on the side of the lamp board 200 facing away from the back plate 110 is covered with a first reflective layer 310. The first reflective layer 310 can reflect light to increase the number of emitted light rays and improve the light efficiency. Different from the related art, in the embodiment of the present application, the reflective material layer 300 not only includes the first reflective layer 310, but also includes a second reflective layer 320. The second reflective layer 320 at least covers the border region 111 on the inner surface of the back plate 110 located between the lamp board 200 and the rubber frame 120, such as Figure 3cAs shown in the figure, by setting the second reflective layer 320, the refraction and reflection paths of the light E in the border area 111 can be increased, the light efficiency utilization can be improved, and the light E falling on the border area 111 of the backplane 110 can be emitted toward the light-emitting side of the backlight module 10 after refraction or reflection. Thus, the brightness of the four peripheral parts of the backlight module 10 can be compensated, the brightness value of the peripheral parts can be increased, and further, it is beneficial to improve the situation that the periphery of the display screen is dark and improve the display quality.

[0098] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0099] Each embodiment in this specification is described in a related manner. The same or similar parts between the embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0100] The above are only the preferred embodiments of the present application and are not used to limit the protection scope of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A backlight module, characterized in that, Comprising: A housing, including a back plate and a rubber frame connected to the back plate. The rubber frame includes four side plates connected end to end. The back plate and the rubber frame jointly define an accommodation space; A light board, disposed within the accommodation space. The light board includes a substrate fixed to the inner surface of the back plate and having a gap with the rubber frame. A plurality of light-emitting elements are disposed on a surface of the substrate away from the back plate; An optical film material, located on a side of the light board away from the back plate; A reflective material layer, including a first reflective layer and a second reflective layer; the first reflective layer covers a partial area of the side of the substrate facing away from the back plate, and the second reflective layer at least covers a border area on the inner surface of the back plate between the light board and the rubber frame.

2. The backlight module according to claim 1, wherein A first area and a second area are provided on a surface of the substrate away from the back plate. The second area surrounds the first area. The light-emitting elements are located within the first area. The first reflective layer covers the first area, and a first via hole for passing the light-emitting elements is provided on the first reflective layer.

3. The backlight module according to claim 2, wherein The substrate is made of a light-transmitting material. The second reflective layer extends in a direction away from the rubber frame and covers a partial area on the inner surface of the back plate corresponding to the light board.

4. The backlight module according to claim 3, wherein A side of the second reflective layer away from the rubber frame is located between the outermost light-emitting elements of the light board and the edge of the substrate. The outermost light-emitting elements are the light-emitting elements disposed closest to the edge of the substrate.

5. The backlight module according to claim 4, wherein In a thickness cross-section of the backlight module, a side of the second reflective layer away from the rubber frame is collinear with the edge of the first reflective layer.

6. The backlight module according to claim 2, wherein The second reflective layer also covers at least a part of the second area and extends from the edge of the substrate towards the center of the substrate.

7. The backlight module according to claim 6, wherein The second reflective layer extends in a direction towards the center of the substrate until it contacts the edge of the first reflective layer, or has a preset gap with the edge of the first reflective layer.

8. The backlight module according to claim 6, wherein A diffusion structure is disposed outside the light-emitting elements; the second reflective layer also covers a part of the first reflective layer, extends from the edge of the substrate in a direction towards the center of the substrate, and overlaps on a side of the first reflective layer facing away from the substrate.

9. The backlight module according to claim 8, wherein, The second reflective layer extends in a direction towards the center of the substrate to between the edge of the first reflective layer and the diffusion structure of the outermost light-emitting elements.

10. The backlight module according to claim 8, wherein, At least a part of the second reflective layer extends in a direction towards the center of the substrate to between the diffusion structure of the outermost light-emitting elements and the diffusion structure of adjacent light-emitting elements. The second reflective layer is provided with a second via hole for passing the diffusion structure of the outermost light-emitting elements.

11. The backlight module according to claim 6, wherein The second reflective layer also covers the outer peripheral surface of the substrate. A part of the second reflective layer covering the outer peripheral surface of the substrate is connected to a part covering the inner surface of the back plate and a part covering the second area of the substrate.

12. The backlight module according to any one of claims 2 to 11, characterized in that, A bonding area is provided on one side of the lamp board. The backlight module further includes an FPC. One end of the FPC is connected to the bonding area, and the other end of the FPC is used to be connected to a control circuit; a break is formed in a portion of the second reflective layer corresponding to the bonding area.

13. The backlight module according to any one of claims 1 to 7, characterized in that, The material of the second reflective layer is white oil.

14. The backlight module according to any one of claims 1 to 12, characterized in that, The material of the second reflective layer is reflective tape.

15. A display device, characterized in that, It includes the backlight module according to any one of claims 1-14.

Images