Backlight module and display device

Abstract

The application discloses a backlight module and a display device. The backlight module comprises at least one backlight unit, and the backlight unit comprises a back plate, a light emitting element arranged on the back plate, a middle frame connected with the edge of the back plate, a diffusion plate arranged on the side of the light emitting element away from the back plate, and an optical film stacked on the side of the diffusion plate away from the light emitting element. The backlight unit further comprises a diffusion structure, one side of the diffusion structure is attached to a display panel, and the other side is attached to the middle frame. The side of the middle frame attached to the diffusion structure is a support surface. The orthographic projection of the support surface on the display panel covers the non-display area and part of the display area of the display panel. The size of the diffusion structure is larger than the size of the diffusion plate. The orthographic projection of the diffusion structure on the display panel covers the orthographic projection of the display area of the support surface on the display panel. The orthographic projection area of the diffusion structure on the display area of the display panel is larger than the orthographic projection area of the support surface on the display area of the display panel. Through the above design, the display panel can be prevented from being bent, and dark shadows can be avoided at the edge of the display device.

Description

TECHNICAL FIELD

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

[0002] With the progress of science and technology, liquid crystal display devices have been widely used in various fields. Generally, a backlight unit supports and fixes a display panel through a middle frame, and a sufficient support area is needed between the middle frame and the display panel to prevent the middle part of the display panel from bending.

[0003] However, with the increasing popularity of narrow frames among users, the width of the non-display area of the narrow-frame display panel is becoming smaller and smaller, while the support area of the middle frame on the display panel cannot be reduced, resulting in that the support position of the display panel on the middle frame exceeds the non-display area and extends into the display area due to the small width of the non-display area, thereby blocking the light into the display area, that is, the light cannot be irradiated to the display area from the support position, and finally a dark shadow appears in the area, affecting the display effect. SUMMARY

[0004] The purpose of the present application is to provide a backlight module and a display device that can prevent the display panel from bending and avoid the problem of dark shadow at the edge of the display device.

[0005] The present application discloses a backlight module, comprising at least one backlight unit, the backlight unit comprising: a back plate; a light emitting element arranged on the back plate; a middle frame connected to the edge of the back plate; a diffusion plate arranged on the side of the light emitting element away from the back plate; an optical film stacked on the side of the diffusion plate away from the light emitting element; the backlight unit further comprises a diffusion structure, one side of the diffusion structure is attached to the display panel, and the other side is attached to the middle frame, one side of the middle frame attached to the diffusion structure is a support surface, the orthogonal projection of the support surface on the display panel covers the non-display area and part of the display area of the display panel, and the size of the diffusion structure is greater than the size of the diffusion plate;

[0006] The orthogonal projection of the diffusion structure on the display panel covers the orthogonal projection of the display area of the support surface on the display panel.

[0007] The orthogonal projection area of the diffusion structure on the display area of the display panel is greater than the orthogonal projection area of the support surface on the display area of the display panel.

[0008] Optionally, the middle frame comprises a main body portion, a first support portion and a second support portion, the first support portion and the second support portion are respectively connected to the two sides of the main body portion, the first support portion abuts on the side of the diffusion plate away from the optical film, and the second support portion supports the side of the diffusion structure abutting thereon as the support surface.

[0009] The backlight module further comprises a first optical fiber, the first optical fiber is arranged in the middle frame, the first optical fiber comprises a first light-out end and a first light-in end, the first light-in end and the first light-out end respectively lead through the first support part and the second support part, and the first light-out end corresponds to the display area of the normal projection of the support surface on the display panel, and the light emitted by the light-emitting element enters the diffusion structure through the first optical fiber.

[0010] Optionally, the backlight module further comprises a light guide plate, the light guide plate is arranged in the second support part, the normal projection of the light guide plate on the display panel completely covers the normal projection of the support surface on the display area of the display panel, and the light emitted by the light-emitting element is emitted to the diffusion structure after entering the light guide plate through the first optical fiber.

[0011] Optionally, the backlight module further comprises a light shielding sheet, the light shielding sheet is simultaneously attached to the side surface of the back plate, the side surface of the first support part and the side surface of the diffusion structure, and one side of the light shielding sheet facing the diffusion plate is a reflection surface.

[0012] Optionally, the diffusion structure comprises an upper surface, a connecting surface and a lower surface connected in sequence, the lower surface is located on one side of the upper surface close to the diffusion plate, the connecting surface abuts against the second support part, and the connecting surface and the support surface are both inclined surfaces, and the included angle between the connecting surface and the upper surface is 40°-50°.

[0013] Optionally, the backlight module comprises a plurality of backlight units, each backlight unit corresponds to one display panel, the plurality of backlight units are arranged in a spliced manner, and a splicing joint is formed between adjacent backlight units; the backlight unit further comprises a second optical fiber, the second optical fiber is arranged only in the middle frame close to the splicing joint, and the second optical fiber comprises a second light-in end and a second light-out end leading through; the second light-in end and the second light-out end respectively lead through the first support part and the second support part, and the second light-out end corresponds to the splicing joint, and the light emitted by the light-emitting element enters the splicing joint through the second optical fiber to supplement the light for the splicing joint.

[0014] Optionally, the second optical fiber further comprises a third light-out end, the third light-out end leads through the second light-in end, the third light-out end corresponds to the display area of the normal projection of the support surface on the display panel, and the light emitted by the light-emitting element enters the diffusion structure through the second optical fiber.

[0015] Optionally, the thickness of the diffusion structure is greater than or equal to the width of the display area of the normal projection of the support surface on the display panel.

[0016] Optionally, the diffusion structure overlaps the display panel.

[0017] The application further discloses a display device, which comprises at least one display panel and the backlight module.

[0018] Compared with the scheme in which the middle frame only contacts the non-display area of the display panel, the support surface of the middle frame of the application supports not only the non-display area of the display panel but also part of the display area, which is equivalent to increasing the support area and improving the stability of the display panel to prevent the display panel from being bent. Moreover, the application adds a diffusion structure between the middle frame and the display panel, which is equivalent to increasing the distance between the middle frame and the display panel, so that the light emitted by the light emitting element can irradiate the display area of the display panel above the support surface, avoiding the problem of dark shadow at the edge of the display panel. Furthermore, the diffusion structure extends out of the middle frame, so that after the light emitted by the light emitting element irradiates the part of the diffusion structure extending out of the middle frame, the light is further irradiated into the display area of the display panel above the support surface after the light is uniformly distributed by the diffusion structure, and the area is further lighted. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and constitute a part of the specification, illustrate the embodiments of the application and together with the text description serve to explain the principles of the application. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings. In the drawings:

[0020] Figure 1 is a schematic diagram of a display device of an embodiment of the application;

[0021] Figure 2 is a schematic diagram of a backlight module of an embodiment of the application;

[0022] Figure 3 is a planar schematic diagram of a diffusion structure of an embodiment of the application;

[0023] Figure 4 is an enlarged schematic diagram of a backlight module of an embodiment of the application;

[0024] Figure 5 is a schematic diagram of a backlight module of an embodiment of the application;

[0025] Figure 6 is a schematic diagram of a plurality of backlight units spliced together of an embodiment of the application;

[0026] Figure 7 is Figure 6 a partial enlarged view of the display device 10 of FIG. 1A;

[0027] Figure 8 is a schematic view of a second light guide member including a third light exit end according to an embodiment of the present application. In the drawing, 10 is a display device; 20 is a display panel; 21 is a display area; 22 is a non-display area; 30 is a backlight module; 300 is a backlight unit; 310 is a back plate; 320 is a light emitting element; 330 is a middle frame; 331 is a first support part; 332 is a main body part; 333 is a second support part; 334 is a support surface; 410 is a diffusion plate; 420 is an optical film; 430 is a diffusion structure; 431 is an upper surface; 432 is a connecting surface; 433 is a lower surface; 440 is a hollow; 510 is a first optical fiber member; 511 is a first light exit end; 512 is a first light entrance end; 520 is a second optical fiber member; 521 is a second light entrance end; 522 is a second light exit end; 523 is a third light exit end; 610 is a light guide plate; 620 is a light shielding sheet; 630 is a joint seam; 640 is a light guide strip; 710 is a refractive region; 711 is a groove structure. DETAILED DESCRIPTION

[0028] It is to be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting. It must be noted that, as used in the specification and the appended claims, the singular forms "a," "an" and "the" include plural referents unless the context clearly dictates otherwise. The term "includes" and its variants are meant to be construed as incorporating the elements or steps following the term into the description, but not precluding the additional inclusion of further elements or steps or the inc

[0029] In the description of the present application, the terms "first", "second", "third", etc. are used only for the purpose of description, and should not be construed as indicating relative importance or implying the number of the technical features indicated. Therefore, unless otherwise specified, the features limited by "first", "second", etc. can explicitly or implicitly include one or more of the features; the meaning of "plurality" is two or more. The term "includes" and any variants thereof mean non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components and / or combinations thereof can exist or be added.

[0030] In addition, the terms indicating the orientation or positional relationship of "center", "transverse", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are described based on the orientation or relative position relationship shown in the drawings, and are only for the convenience of the simplified description of the present application, and should not be construed as indicating that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application.

[0031] In addition, unless specifically stated and limited otherwise, the terms "mounting", "connected", "connecting" should be interpreted broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, or can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0032] The application will be described in detail below with reference to the accompanying drawings and optional embodiments.

[0033] Figure 1 is a schematic diagram of a display device according to an embodiment of the application, as shown in the figure, Figure 1 The application discloses a display device 10, which comprises a display panel 20 and a backlight module 30, and the backlight module 30 provides backlight for the display panel 20.

[0034] Among them, the technical scheme of the application can be widely used in various display panels 20, such as TN (Twisted Nematic) display panel 20, IPS (In-Plane Switching) display panel 20, VA (Vertical Alignment) display panel 20, MVA (Multi-Domain Vertical Alignment) display panel 20.

[0035] The application also discloses a backlight module 30, which can be used in the above-mentioned display device 10, and for the backlight module 30, the application provides the following design:

[0036] Figure 2 is a schematic diagram of a backlight module according to an embodiment of the application, as shown in the figure, Figure 2 Figure 2 Taking the backlight module 30 comprising one backlight unit 300 as an example for explanation, of course, the backlight module 30 can also comprise a plurality of backlight units 300, and the plurality of backlight units 300 are spliced to form one backlight module 30, and one backlight unit 300 provides light source for one display panel 20.

[0037] Figure 2 ​The middle arrow direction is a partial light conduction path, and the backlight module 30 comprises at least one backlight unit 300, the backlight unit 300 comprising: a back plate 310; a light emitting element 320 arranged on the back plate 310; a middle frame 330 connected with the edge of the back plate 310; a diffusion plate 410 arranged on the side of the light emitting element 320 away from the back plate 310; and an optical film 420 stacked on the side of the diffusion plate 410 away from the light emitting element 320.

[0038] The backlight unit 300 comprises a direct type backlight unit 300 and a side type backlight unit 300, and is used to provide backlight for a display panel 20, wherein the display panel 20 is a narrow frame display panel 20, and the display panel 20 comprises a display area 21 and a non-display area 22, and the non-display area 22 is arranged around the display area 21.

[0039] The backlight unit 300 further comprises a diffusion structure 430, one side of the diffusion structure 430 being attached to the display panel 20, and the other side being attached to the middle frame 330, and the side of the middle frame 330 attached to the diffusion structure 430 is a support surface 334, the orthogonal projection of the support surface 334 on the display panel 20 covering the non-display area 22 and part of the display area 21 of the display panel 20, and the size of the diffusion structure 430 is greater than the size of the diffusion plate 410.

[0040] The orthogonal projection of the diffusion structure 430 on the display panel 20 covers the orthogonal projection of the display area 21 of the support surface 334 on the display panel 20; and the area of the orthogonal projection of the diffusion structure 430 on the display area 21 of the display panel 20 is greater than the area of the orthogonal projection of the support surface 334 on the display area 21 of the display panel 20.

[0041] The diffusion structure 430 is made of the diffusion plate 410 and has the same function as the diffusion plate 410.

[0042] Compared with the scheme in which the middle frame 330 is only attached to the non-display area 22 of the display panel 20, the support surface 334 of the present application not only supports the non-display area 22 of the display panel 20, but also supports part of the display area 21, which is equivalent to increasing the volume of the support surface 334 and improving the stability of the display panel 20 to prevent the display panel 20 from being bent; however, this will cause the problem of dark shadow on the edge of the display panel 20.

[0043] Therefore, the application also increases the distance between the middle frame 330 and the display panel 20 by adding a diffusion structure 430 between the middle frame 330 and the display panel 20, so that the light emitted by the light emitting element 320 can irradiate into the display area 21 of the display panel 20 above the support surface 334, avoiding the problem of dark shadow at the edge of the display panel 20; and the diffusion structure 430 extends out of the middle frame 330, so that after the light emitted by the light emitting element 320 irradiates to the part of the diffusion structure 430 extending out of the middle frame 330, the light is further irradiated into the display area 21 of the display panel 20 above the support surface 334 after the light uniformization of the diffusion structure 430, and the area is further lighted.

[0044] The diffusion structure 430 is bonded to the display panel 20 by transparent optical glue, avoiding light loss at the bonding position.

[0045] In order to avoid the light leakage at the edge of the backlight module 30 corresponding to the diffusion plate 410 structure due to the setting of the diffusion structure 430, the application also adds a light shielding sheet 620, which is attached to the side surface of the back plate 310, the side surface of the first support part 331 and the side surface of the diffusion structure 430, and the side of the light shielding sheet 620 facing the diffusion plate 410 is a reflective surface.

[0046] The light shielding sheet 620 can prevent the light leakage at the edge of the backlight module 30, and the light irradiated to the light shielding sheet 620 can be reflected by the reflective surface, improving the utilization rate of light.

[0047] In order to ensure that the light emitted by the light emitting element 320 can be refracted smoothly into the display area 21 of the display panel 20 above the support surface 334 after passing through the diffusion plate 410 and the optical film 420, the thickness of the diffusion structure 430 should be greater than or equal to the width of the display area 21 of the normal projection of the support surface 334 on the display panel 20.

[0048] That is, the thickness of the support structure should be greater than or equal to the width of the display area 21 of the display panel 20 overlapping with the support surface 334, so that the light can irradiate into the display area 21 of the display panel 20 overlapping with the support surface 334.

[0049] The diffusion structure 430 can be an entire plate structure, specifically: the diffusion structure 430 overlaps with the display panel 20, that is, the area of the diffusion structure 430 is equal to the area of the display panel 20; and the size of the diffusion structure 430 is greater than the size of the diffusion plate 410, which increases the structural strength of the display panel 20, so that the display panel 20 is less likely to be bent and deformed.

[0050] At this time, the diffusion structure 430 can directly use a large-size diffusion plate 410, which is equivalent to two diffusion plates 410 in the present application. The diffusion plate 410 close to the light-emitting element 320 can be used to support the optical film 420 and adjust the light mixing distance. Since the diffusion structure 430 is arranged above the diffusion plate 410, the thickness of the diffusion plate 410 close to the light-emitting element 320 can also be correspondingly reduced.

[0051] And the display panel 20 of the present application also includes an upper polarizer and a lower polarizer, the upper polarizer and the lower polarizer are respectively arranged on the upper and lower sides of the display panel 20, and the lower polarizer can be arranged between the display panel 20 and the diffusion structure 430, or arranged on the side of the diffusion structure 430 away from the display panel 20.

[0052] Of course, as shown in Figure 3 , the diffusion structure 430 can also be a square structure, which can be understood as a hollow 440 in the middle of a complete diffusion plate 410. This can reduce the manufacturing cost of the diffusion structure 430 and help reduce the weight of the entire backlight module 30.

[0053] Figure 4 is a magnified schematic view of a backlight module according to an embodiment of the present application, as Figure 4 shown, Figure 4 The arrow direction is the conduction path of part of the light. The middle frame 330 of the present application includes a main body part 332, a first support part 331 and a second support part 333, the first support part 331 and the second support part 333 are respectively connected on both sides of the main body part 332, the first support part 331 abuts on the side of the diffusion plate 410 away from the optical film 420, and the second support part 333 supports the support surface 334 abutting on the diffusion structure 430.

[0054] The first support part 331 and the main body part 332 are directly at right angles, and the second support part 333 and the first support part 331 are at right angles. The Z-shaped middle frame 330 simultaneously plays the role of supporting the display panel 20, the diffusion structure 430, the diffusion plate 410 and the optical film 420.

[0055] The backlight module 30 further includes a first optical fiber 510, the first optical fiber 510 has a light channel inside, a reflective package material is arranged on the surface, and the two ends are filled with a medium, so that the light entering the first optical fiber from the first light inlet end 512 can be emitted from the first light outlet end 511 in a low-loss manner after multiple refractions.

[0056] The first optical fiber 510 is arranged in the middle frame 330, the first optical fiber 510 includes a first light emitting end 511 and a first light receiving end 512, the first light receiving end 512 and the first light emitting end 511 are respectively connected with the first support part 331 and the second support part 333, and the first light emitting end 511 corresponds to the display area 21 of the normal projection of the support surface 334 on the display panel 20, and the light emitted by the light emitting element 320 enters the diffusion structure 430 through the first optical fiber 510.

[0057] In the first optical fiber 510, the light is not directly guided to the display panel 20, but is guided to the diffusion structure 430, and the diffusion structure 430 diffuses the light guided by the first optical fiber 510, so that when the first optical fiber 510 supplements the light of the display area 21 corresponding to the support surface 334 of the display panel 20, there is no obvious bright spot phenomenon in the position of the display panel 20 corresponding to the first optical fiber 510.

[0058] Further, the application can further increase the light guide plate 610, the light guide plate 610 is arranged in the second support part 333, at this time, the first light emitting end 511 of the first optical fiber 510 corresponds to the normal projection of the light guide plate 610 on the display panel 20, which completely covers the normal projection of the support surface 334 on the display area 21 of the display panel 20, and the light emitted by the light emitting element 320 enters the light guide plate 610 through the first optical fiber 510 and is emitted to the diffusion structure 430.

[0059] The light guide plate 610 is a square structure, which can receive the light conducted by the first optical fiber 510 and conduct the light to the display area 21 corresponding to the support surface 334 of the entire display panel 20, so as to avoid the bright spot phenomenon in the position of the edge area of the display panel 20 corresponding to the first optical fiber 510. Moreover, a small amount of first optical fiber 510 can be arranged to supplement the light of the display area 21 corresponding to the support surface 334 of the entire display panel 20, thereby reducing the production cost and avoiding the decrease of the structural strength of the middle frame 330.

[0060] Further, the diffusion structure further includes a refractive region 710, the refractive region 710 is located on the side of the diffusion structure 430 away from the display panel 20 and close to the support surface 334, a plurality of groove structures 711 are arranged in the refractive region 710, the light emitted by the light emitting element 320 is irradiated in the refractive region 710, and the further refraction of the groove structure 711 makes the light more easily irradiated into the display area 21 of the display panel 20 overlapping with the support surface 334.

[0061] Figure 5This is a partially enlarged schematic diagram of a backlight module according to an embodiment of this application, as shown below. Figure 5 As shown, the diffusion structure 430 includes an upper surface 431, a connecting surface 432, and a lower surface 433 connected in sequence. The lower surface 433 is located on the side of the upper surface 431 closest to the diffusion plate 410. The connecting surface 432 abuts against the second support portion 333. Both the connecting surface 432 and the support surface 334 are inclined surfaces, and the angle between the connecting surface 432 and the upper surface 431 is 40°-50°. Preferably, the angle between the connecting surface 432 and the upper surface 431 is 45°. Setting the angle between the connecting surface 432 and the upper surface 431 to 45° ensures that the light emitted by the light-emitting element 320 illuminates the display area 21 of the display panel 20 corresponding to the support surface 334.

[0062] Since both the supporting surface 334 and the connecting surface 432 are inclined surfaces, the area of ​​the supporting surface 334 can be increased without increasing the width of the first supporting part 331, thereby improving the stability of the diffusion structure 430.

[0063] Furthermore, since both the connecting surface 432 and the supporting surface 334 of the diffusion structure 430 are inclined surfaces, the light emitted by the diffusion structure 430 to the side is blocked by the supporting surface 334, thus preventing light leakage from the side of the backlight module 30. Moreover, the addition of the diffusion structure 430 does not increase the overall thickness of the backlight module 30.

[0064] Figure 6 This is a schematic diagram of multiple backlight units spliced ​​together according to an embodiment of this application. Figure 7 yes Figure 6 A partially enlarged schematic diagram, combined with Figure 6 and Figure 7 As shown, the backlight module 30 includes a plurality of backlight units 300, each of the backlight units 300 corresponding to a display panel 20. The plurality of backlight units 300 are spliced ​​together, and a splicing seam 630 is formed between adjacent backlight units 300. The following explanation will take a backlight module 30 including two spliced ​​backlight units 300 as an example.

[0065] The backlight unit 300 further comprises a second optical fiber piece 520, which is arranged only in the middle frame 330 near the splicing joint 630, and the second optical fiber piece 520 comprises a second light-in end 521 and a second light-out end 522; the second light-in end 521 and the second light-out end 522 are in communication with the first support part 331 and the second support part 333 respectively, and the second light-out end 522 corresponds to the splicing joint 630, and the light emitted by the light-emitting element 320 enters the splicing joint 630 through the second optical fiber piece 520 to supplement the light for the splicing joint 630.

[0066] The light-out port of the second light-out end 522 is directed to the upper side of the splicing joint 630, and the light emitted by the light-emitting element 320 on the backboard 310 is guided to the splicing joint 630 of the two backlight units 300 through the second optical fiber piece 520 to supplement the light for the splicing joint 630, so that the phenomenon of dark joint of the display device 10 corresponding to the splicing joint 630 is prevented, and compared with the scheme of arranging the lamp beads at the splicing joint 630, the light on the backboard 310 is guided to the splicing joint 630 through the second optical fiber piece 520, which is lower in cost, and the problems such as how to wire the newly added lamp beads and how to dissipate heat are not needed to be considered.

[0067] Further, the first optical fiber piece 510 and the second optical fiber piece 520 can be arranged simultaneously in the middle frame 330 near the splicing joint 630.

[0068] Of course, a third light-out end 523 can be arranged on the second optical fiber piece 520, and specifically, as shown in Figure 8 The third light-out end 523 is in communication with the second light-in end 521, the third light-out end 523 corresponds to the display area 21 of the normal projection of the support surface 334 on the display panel 20, and the light emitted by the light-emitting element 320 enters the diffusion structure 430 through the second optical fiber piece 520.

[0069] In this way, the second optical fiber piece 520 can supplement the light for the splicing joint 630 and the display area 21 of the support surface 334 of the display panel 20 simultaneously, so as to save the number of structures in the middle frame 330 and reduce the process difficulty.

[0070] Further, a light guide strip 640 can be arranged at the splicing joint 630, the light guide strip is arranged above the second light-out end 522, and the light guide strip 640 completely covers the splicing joint 630, the optical fiber from the second light-out end 522 enters the light guide strip 640, and the light is emitted from the splicing joint 630 of the backlight module 30 through the guidance of the light guide strip 640, so that too many second optical fiber pieces 520 are not needed to supplement the light for the entire splicing joint 630.

[0071] It should be noted that the inventive concept of the present application can form a very large number of embodiments, but the length of the application file is limited and cannot list them one by one, so the above described embodiments or technical features can be combined to form new embodiments without conflict, and the combination of each embodiment or technical feature will enhance the original technical effect.

[0072] The above is a further detailed description of the present application in combination with specific optional embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the art to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which should be considered as falling within the scope of protection of the present application.

Claims

1. A backlight module comprising at least one backlight unit, the backlight unit comprising: Back plate; Light emitting element, disposed on the back plate; Middle frame, connected with the edge of the back plate; Diffusion plate, disposed on the side of the light emitting element away from the back plate; Optical film, stacked on the side of the diffusion plate away from the light emitting element; characterized in that, The backlight unit further comprises a diffusion structure, one side of the diffusion structure is attached to the display panel, and the other side is attached to the middle frame, one side of the middle frame attached to the diffusion structure is a support surface, the orthogonal projection of the support surface on the display panel covers the non-display area and part of the display area of the display panel, and the size of the diffusion structure is larger than that of the diffusion plate; The orthogonal projection of the diffusion structure on the display panel covers the orthogonal projection of the display area of the support surface on the display panel; The orthogonal projection area of the diffusion structure on the display area of the display panel is larger than the orthogonal projection area of the support surface on the display area of the display panel; The backlight module comprises a plurality of backlight units, each backlight unit corresponds to a display panel, the plurality of backlight units are arranged in a splicing manner, and a splicing joint is formed between adjacent backlight units; The backlight unit further comprises a second optical fiber, the second optical fiber is arranged only in the middle frame near the splicing joint, and the second optical fiber comprises a second light inlet end and a second light outlet end which are in communication; The middle frame comprises a main body, a first support part and a second support part, the first support part and the second support part are connected to the two sides of the main body respectively, the first support part abuts on the side of the diffusion plate away from the optical film, and the second support part supports the side abutting with the diffusion structure, which is the support surface; The second light inlet end and the second light outlet end are in communication with the first support part and the second support part respectively, and the second light outlet end corresponds to the splicing joint, the light emitted by the light emitting element enters the splicing joint through the second optical fiber to supplement the light for the splicing joint; The second optical fiber further comprises a third light outlet end, the third light outlet end is in communication with the second light inlet end, the third light outlet end corresponds to the display area of the orthogonal projection of the support surface on the display panel, and the light emitted by the light emitting element enters the diffusion structure through the second optical fiber.

2. The backlight module of claim 1, wherein, The backlight module further comprises a first optical fiber, the first optical fiber is arranged in the middle frame, the first optical fiber comprises a first light outlet end and a first light inlet end, the first light inlet end and the first light outlet end are in communication with the first support part and the second support part respectively, and the first light outlet end corresponds to the display area of the orthogonal projection of the support surface on the display panel, and the light emitted by the light emitting element enters the diffusion structure through the first optical fiber.

3. The backlight module of claim 2, wherein, The backlight module further comprises a light guide plate, the light guide plate is arranged in the second support part, the orthogonal projection of the light guide plate on the display panel completely covers the orthogonal projection of the support surface on the display area of the display panel, and the light emitted by the light emitting element enters the light guide plate through the first optical fiber and is emitted to the diffusion structure.

4. The backlight module of claim 2, wherein, The diffusion structure comprises a top surface, a connecting surface and a bottom surface connected in sequence, the bottom surface is located on the side of the top surface close to the diffusion plate, the connecting surface is in abutment with the second supporting part, the connecting surface and the supporting surface are both inclined surfaces, and the included angle between the connecting surface and the top surface is 40-50°.

5. The backlight module of claim 1, wherein, The thickness of the diffusion structure is greater than or equal to the display area width of the orthographic projection of the supporting surface on the display panel.

6. The backlight module of claim 1, wherein, The diffusion structure overlaps the display panel.

7. A display device, characterized by The display device comprises at least one display panel and the backlight module as claimed in any one of claims 1-6, and the backlight module provides backlight for the display panel.

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