Backlight module and display device

Abstract

The application discloses a backlight module, which comprises a lamp strip, and the lamp strip comprises at least one lamp bead. A diffusion structure is arranged between the lamp bead and the light inlet surface of the light guide plate. The diffusion structure can perform uniform light treatment on the light emitted by the lamp bead in a non-display area, so that the luminance difference between the area in front of the lamp bead and the area between two adjacent lamp beads is small, the optical defect of the light eye of the backlight module in the edge of the display area is weakened, the light mixing buffer distance between the lamp bead and the display area can be reduced or cancelled, and the frame of the side-in type liquid crystal display device is reduced. The application further provides a display device comprising the display panel.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically, to a backlight module and a display device. Background Technology

[0002] In some liquid crystal display devices, when light is incident on the light guide plate, a hotspot is formed at the position corresponding to the lamp bead.

[0003] Due to the near-field high light spot effect, a minimum light mixing buffer distance needs to be reserved between the LED and the display area, resulting in a large bezel for the display device.

[0004] It should be noted that the information in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to overcome the problem that the minimum light mixing buffer distance between the light source and the display area is required, resulting in a large bezel of the display device, and to provide a backlight module and a display device.

[0006] According to one aspect of the present invention, a backlight module is provided, the backlight module including a light guide plate, a lamp strip and a diffusion structure, the lamp strip including at least one lamp bead, the at least one lamp bead being disposed on the light incident surface of the light guide plate; the diffusion structure being disposed between the lamp bead and the light incident surface of the light guide plate.

[0007] In one embodiment of the present invention, the light strip includes a plurality of LED beads, which are arranged sequentially along the light incident surface of the light guide plate. The backlight module also includes a diffusion adhesive layer, which is connected between the diffusion structure and the light guide plate.

[0008] In one embodiment of the present invention, the diffusion adhesive layer includes a plurality of diffusion adhesive portions. The orthographic projection of the diffusion adhesive portion on the light-incident surface of the light guide plate is located between the orthographic projections of two adjacent lamp beads on the light-incident surface of the light guide plate, or the orthographic projection of the diffusion adhesive layer on the light-incident surface of the light guide plate overlaps with the orthographic projection of the diffusion structure on the light-incident surface of the light guide plate.

[0009] In one embodiment of the present invention, the backlight module further includes a diffuser plate, which is disposed on the light-emitting side of the light guide plate. The diffuser structure is integrally formed with the diffuser plate, and a cutting seam is provided at the junction of the diffuser plate and the diffuser structure.

[0010] In one embodiment of the present invention, the light-incident surface of the light guide plate is provided with a plurality of grooves, the diffusion structure includes a plurality of sub-diffusers, different sub-diffusers are respectively disposed in the grooves, the diffusion adhesive layer includes a plurality of diffusion adhesives, and the sub-diffusers are bonded to the bottom surface of the grooves through the diffusion adhesives.

[0011] In one embodiment of the present invention, a protrusion is formed between adjacent grooves, and the LED is disposed on the side of the sub-diffuser away from the bottom surface of the groove, and the LED is disposed on the side of the protrusion away from the diffuser structure.

[0012] In one embodiment of the present invention, the angle between the side surface of the protrusion and the bottom surface of the groove is greater than or equal to 60° and less than or equal to 110°.

[0013] In one embodiment of the present invention, the angle between the side surface of the protrusion and the bottom surface of the groove is greater than or equal to 80° and less than or equal to 90°. Along the length extension direction of the light-incident surface of the light guide plate, from the middle of the light-incident surface of the light guide plate to both ends of the light-incident surface of the light guide plate, the angle between the side surface of different protrusions and the bottom surface of the groove gradually increases.

[0014] In one embodiment of the present invention, the backlight module further includes a diffusion black strip, which is disposed on the side of the diffusion plate away from the light guide plate, and the cutting seam line is disposed on the side of the diffusion black strip closer to the lamp bead.

[0015] In one embodiment of the present invention, the distance between the diffusion structure and the lamp bead is less than or equal to 1.5 mm, the size of the diffusion structure is greater than or equal to 0.3 mm and less than or equal to 3 mm in the thickness direction of the backlight module, the sum of the thickness of the diffusion structure and the diffusion adhesive layer is greater than or equal to 0.07 mm and less than or equal to 1.5 mm, and the size of the diffusion adhesive portion along the extension direction of the light-incident surface of the light guide plate is greater than or equal to 0.5 mm and less than or equal to 2 mm.

[0016] In one embodiment of the present invention, the distance between the diffusion structure and the lamp bead is less than or equal to 1.5 mm, the size of the diffusion structure is greater than or equal to 0.3 mm and less than or equal to 3 mm in the thickness direction of the backlight module, and the size of the sub-diffuser is greater than or equal to 1 mm and less than or equal to 5 mm in the length extension direction of the light-incident surface of the light guide plate.

[0017] In one embodiment of the present invention, a screen printing ink layer is provided between the light guide plate and the diffuser plate, and the orthographic projection of the screen printing ink layer on the light guide plate and the orthographic projection of the diffuser black stripe on the light guide plate overlap each other.

[0018] According to another aspect of the present invention, a display device is provided, comprising a backlight module provided in one aspect of the present invention.

[0019] The backlight module of the present invention includes a light strip, the light strip includes at least one LED, and a diffusion structure is provided between the LED and the light incident surface of the light guide plate. The diffusion structure can perform light homogenization processing on the light emitted by the LED in the non-display area in advance, so that the brightness difference between the area directly in front of the LED and the area between two adjacent LEDs is reduced, weakening the optical defects of uneven brightness generated by the LED eye of the backlight module at the edge of the display area. Therefore, the light mixing buffer distance between the LED and the display area can be reduced or eliminated, thereby reducing the bezel of the edge-lit liquid crystal display device.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0022] Figure 1 This is a schematic diagram of the shadow at the arc-shaped corner of the backlight module according to an embodiment of the present invention.

[0023] Figure 2 A cross-sectional schematic diagram of the backlight module according to an embodiment of the present invention, wherein the diffusion structure is disposed between the light-incident surface of the lamp bead and the light guide plate.

[0024] Figure 3 for Figure 2 A magnified view of a portion of the image.

[0025] Figure 4 A planar schematic diagram of a backlight module according to an embodiment of the present invention, wherein the diffusion structure includes multiple sub-diffusers.

[0026] Figure 5 This is a planar schematic diagram of the backlight module according to an embodiment of the present invention, where the diffusion adhesive layer is a continuous structure across the entire surface.

[0027] Figure 6 When the diffusion structure is located between the light-incident surface of the LED chip and the light guide plate, Figure 2 A magnified view of part A in the middle.

[0028] Figure 7 A cross-sectional schematic diagram of the backlight module according to an embodiment of the present invention, in order to attach different sub-diffusers to the bottom surface of the groove.

[0029] Figure 8A three-dimensional structural diagram of the backlight module according to an embodiment of the present invention, showing the different sub-diffusers being attached to the bottom surface of the groove.

[0030] Figure 9 To attach different sub-diffusion parts separately to the bottom surface of the groove, Figure 7 A magnified view of part B in the middle.

[0031] Figure 10 This is a planar schematic diagram of the backlight module partial structure according to an embodiment of the present invention, when the diffusion structure is divided into a first part and a second part by a cut seam line.

[0032] Figure 11 A cross-sectional schematic diagram of the backlight module structure according to an embodiment of the present invention, when the diffusion structure is divided into a first part and a second part by cutting along the seam.

[0033] Figure 12 A planar schematic diagram of the backlight module structure according to an embodiment of the present invention, in order to attach different sub-diffusers to the bottom surface of the groove.

[0034] Figure 13 A planar schematic diagram of the backlight module structure in this embodiment of the invention, where the included angle between the side of different protrusions and the bottom of the groove is different.

[0035] In the diagram: 1-Back panel, 11-Bottom panel, 12-Side panel, 121-First side panel, 122-Second side panel, 123-Third side panel, 2-Frame, 21-First frame section, 22-Second frame section, 23-Third frame section, 24-Mounting slot, 3-Reflector, 4-Light guide plate, 41-Groove, 42-Protrusion, 5-Diffuser plate, 6-Light strip, 61-Flexible circuit board, 62-LED chip, 7- 8-Second brightening film, 9-Diffusing black stripe, 10-Light-shielding adhesive, 101-First light-shielding part, 102-Second light-shielding part, 13-Support layer, 14-Diffusing structure, 141-Cut seam line, 142-Sub-diffusing part, 15-Diffusing adhesive layer, 151-Diffusing adhesive part, 16-First adhesive part, 17-Second adhesive part, 18-Screen printing ink, 100-Lamp eye, 200-Shadow. Detailed Implementation

[0036] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted. Furthermore, the drawings are merely illustrative of the invention and are not necessarily drawn to scale.

[0037] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0038] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0039] like Figure 1 and Figure 2 As shown, in some edge-lit liquid crystal display devices, the lamp strip 6 of the backlight module receives light along the light-incident surface of the light guide plate 4, and multiple lamp beads 62 of the lamp strip 6 are spaced apart along the length of the light-incident surface of the light guide plate 4. The height of the lamp beads 62 is basically the same as the thickness of the light guide plate 4, and the emitted light from the lamp beads 62 is conducted to the display area through the light guide plate 4. When large-angle light enters the light guide plate 4, it quickly reaches the upper or lower surface of the light guide plate 4. Because the incident angle is greater than the critical angle, multiple total internal reflections will occur in the near-end region of the light guide plate 4, making the light density in this near-end region much higher than the light density in the far-end region. Some of the reflected light encounters the nearby dots and is emitted directly upwards, causing local high brightness in front of the lamp beads 62. However, there is less large-angle reflected light concentrated in the area between two adjacent lamp beads 62, so the brightness in the area between adjacent lamp beads 62 is lower, resulting in lamp eyes 100 (hotspots) forming at the edge of the backlight module.

[0040] If the distance between the LED chip 62 and the display area is continuously reduced, the light will reach the display area before it has been fully diffused and mixed. This will cause the backlight module to emit uneven light, which, when passing through the liquid crystal cell, will easily lead to optical defects such as uneven brightness at the edges of the display area. Due to the limitations of the LED 100 effect, a minimum light mixing buffer distance needs to be reserved between the LED chip 62 and the display area. This light mixing buffer distance is difficult to reduce further, resulting in a wider bezel 2 for the edge-lit liquid crystal display device.

[0041] Based on this, embodiments of the present invention provide a backlight module. For example... Figures 2 to 13As shown, the backlight module includes a light guide plate 4, a light strip 6, and a diffusion structure 14. The light strip 6 includes at least one LED 62, which is disposed on the light incident surface of the light guide plate 4. The diffusion structure 14 is disposed between the LED 62 and the light incident surface of the light guide plate 4.

[0042] A diffusion structure 14 is provided between the LED 62 and the light-incident surface of the light guide plate 4. The diffusion structure 14 can perform light homogenization processing on the light emitted by the LED 62 in the non-display area in advance, so that the brightness difference between the area directly in front of the LED 62 and the area between two adjacent LEDs 62 is reduced, weakening the optical defects of uneven brightness generated by the backlight module's lamp eye 100 (Hotspot) at the edge of the display area. Therefore, the light mixing buffer distance between the LED 62 and the display area can be reduced or eliminated, thereby reducing the bezel 2 of the side-lit liquid crystal display device.

[0043] The backlight module involved in the embodiments of the present invention will be described in detail below with reference to specific examples.

[0044] like Figure 2 As shown, the backlight module may include a back panel 1 and a frame 2. The back panel 1 includes a base plate 11 and side plates 12 connected around the base plate 11. The side plates 12 are disposed perpendicular to the base plate 11. The frame 2 includes a first frame portion 21, a second frame portion 22, and a third frame portion 23. The first frame portion 21 and the second frame portion 22 are disposed adjacent to each other on one side of the backlight module, and the third frame portion 23 is disposed on the other side of the backlight module. The second frame portion 22 is disposed on the side of the first frame portion 21 near the third frame portion 23. The outer surfaces of the first frame portion 21, the second frame portion 22, and the third frame portion 23 are all provided with mounting grooves 24. The side plate 12 includes a first side plate 121, a second side plate 122, and a third side plate 123. The first side plate 121 is snapped into the mounting groove 24 on the outer surface of the first frame portion 21, the second side plate 122 is snapped into the mounting groove 24 on the outer surface of the second frame portion 22, and the third side plate 123 is snapped into the mounting groove 24 on the outer surface of the third frame portion 23.

[0045] The inner surface of the first side plate 121 is in contact with the bottom surface of the mounting groove 24 on the outer surface of the first frame portion 21. The outer surface of the first side plate 121 and the area of ​​the outer surface of the first frame portion 21 without the mounting groove 24 are on the same plane. The inner surface of the second side plate 122 is in contact with the bottom surface of the mounting groove 24 on the outer surface of the second frame portion 22. The outer surface of the second side plate 122 and the area of ​​the outer surface of the second frame portion 22 without the mounting groove 24 are on the same plane. The inner surface of the third side plate 123 is in contact with the bottom surface of the mounting groove 24 on the outer surface of the third frame portion 23. The outer surface of the third side plate 123 and the area of ​​the outer surface of the third frame portion 23 without the mounting groove 24 are on the same plane. The back plate 1 and the frame 2 are combined to form a cavity. The back plate 1 can be made of metal, and the frame 2 can be made of adhesive.

[0046] The backlight module may further include a reflector 3, a light guide plate 4, and a diffuser 5. The reflector 3 is disposed on the base plate 11, with its first side spaced apart from the inner surface of the second frame portion 22, meaning the edge area of ​​the base plate 11 is not covered by the reflector 3. The light guide plate 4 is disposed on the side of the reflector 3 away from the base plate 11, and the light guide plate 4 may be rectangular in shape. The light guide plate 4 has parallel light-incident surfaces and non-light-incident surfaces, with the light-incident surface of the light guide plate 4 recessed relative to the first side of the reflector 3, exposing the edge area of ​​the reflector 3. The diffuser 5 is disposed on the side of the light guide plate 4 away from the base plate 11, with its first side recessed relative to the light-incident surface of the light guide plate 4, exposing the edge area of ​​the light guide plate 4.

[0047] The backlight module also includes a light strip 6, which includes a flexible circuit board 61 and multiple LED beads 62. The first end of the flexible circuit board 61 is connected to the edge area of ​​the light guide plate 4 through a first adhesive portion 16. The multiple LED beads 62 are electrically connected to the first end of the flexible circuit board 61, and the LED beads 62 are arranged opposite to the light-incident surface of the light guide plate 4. The end of the second frame portion 22 away from the bottom plate 11 is lower than the first side plate 121 and the end of the first frame portion 21 away from the bottom plate 11. The side of the second frame portion 22 away from the bottom plate 11 is provided with a second adhesive portion 17. The side of the flexible circuit board 61 away from the LED beads 62 is bonded to the second adhesive portion 17, and the other part extends through the first frame portion 21 and the first side plate 121 to the outside of the cavity.

[0048] The diffuser plate 5 partially covers the light guide plate 4. The second side of the diffuser plate 5 is closer to the frame 2 than the non-light-incident surface of the light guide plate 4, exposing the edge area of ​​the diffuser plate 5. The backlight module also includes a first brightness enhancement film 7 and a second brightness enhancement film 8. The first brightness enhancement film 7 is disposed on the side of the diffuser plate 5 away from the back plate 1. The first side of the first brightness enhancement film 7 is recessed relative to the first side of the diffuser plate 5. The second side of the first brightness enhancement film 7 is flush with the second side of the diffuser plate 5. The second brightness enhancement film 8 is disposed on the side of the first brightness enhancement film 7 away from the back plate 1. Both sides of the second brightness enhancement film 8 are flush with both sides of the first brightness enhancement film 7.

[0049] The backlight module also includes a diffusion black strip 9, which is disposed on the edge region of the diffusion plate 5 and is spaced apart from the first edge of the first brightness enhancement film 7 and the first edge of the second brightness enhancement film 8. The backlight module also includes a light-shielding adhesive 10, which includes a first light-shielding portion 101 and a second light-shielding portion 102. The first light-shielding portion 101 is bonded to the side of the flexible circuit board 61 away from the base plate 11, the side of the diffusion black strip 9 away from the base plate 11, and the edge region of the second edge of the second brightness enhancement film 8 away from the base plate 11. The second light-shielding portion 102 is bonded to the edge region of the second edge of the second brightness enhancement film 8 away from the base plate 11. The backlight module also includes a support layer 13, which is disposed on the side of the first light-shielding portion 101 away from the base plate 11 and can be used to support the display layer.

[0050] like Figure 3 As shown, the backlight module also includes a diffusion structure 14 and a diffusion adhesive layer 15. The diffusion structure 14 is disposed between the light-incident surface of the LED 62 and the light guide plate 4, and the diffusion adhesive layer 15 is bonded between the diffusion structure 14 and the light guide plate 4. The diffusion structure 14 can perform light homogenization processing on the light emitted by the LED 62 in the non-display area in advance, so that the brightness difference between the area directly in front of the LED 62 and the area between two adjacent LEDs 62 is reduced, thus weakening the optical defects of uneven brightness generated by the backlight module's lamp eye 100 at the edge of the display area (Hotspot).

[0051] like Figure 4 As shown, the diffusion adhesive layer 15 may include multiple diffusion adhesive portions 151. The orthographic projection of the diffusion adhesive portion 151 on the light-incident surface of the light guide plate 4 is located between the orthographic projections of the two adjacent LED beads 62 on the light-incident surface of the light guide plate 4. The diffusion adhesive portion 151 is located between two adjacent LED beads 62, and there is no diffusion adhesive portion 151 directly in front of the LED beads 62. This avoids the diffusion adhesive portion 151 affecting the light uniformity and light transmittance, thus maximizing the light uniformity effect in front of the LED beads 62. Figure 5 As shown, the orthographic projection of the diffusion adhesive layer 15 on the light-incident surface of the light guide plate 4 can also overlap with the orthographic projection of the diffusion structure 14 on the light-incident surface of the light guide plate 4, that is, the shape and size of the diffusion adhesive layer 15 are equal to the shape and size of the flexible circuit board 61.

[0052] like Figure 6 As shown, the distance between the diffusion structure 14 and the LED chip 62 is L1, 0mm≤L1≤1.5mm; the dimension of the diffusion structure 14 in the thickness direction of the backlight module is H1, 0.3mm≤H1≤3mm; and the sum of the thicknesses of the diffusion structure 14 and the diffusion adhesive layer 15 is L2, 0.07mm≤L2≤1.5mm. Figure 4 As shown, the dimension of the diffusion adhesive portion 151 along the extension direction of the light incident surface of the light guide plate 4 is L3, 0.5mm≤L3≤2mm.

[0053] like Figure 1 As shown, the four corners of a typical liquid crystal display device are rounded. The rounded corners near the LED strip 6 receive less light, often resulting in a shadow 200. While adding dots to the side of the light guide plate 4 near the base plate 11 can supplement the light, the effective light path from the LED strip 6 is interrupted by the contour of the rounded corners, meaning the effective incident light flux received by the light guide plate 4 at the rounded corners is already low. The dots can only couple and guide light that has already reached the rounded corners; therefore, even increasing the dot density cannot generate light. Improving coupling efficiency solely through dots cannot completely eliminate the shadow 200.

[0054] like Figures 7 to 9 As shown, the light-incident surface of the light guide plate 4 is provided with multiple grooves 41. The diffusion structure 14 is integrally formed with the diffusion plate 5. The diffusion structure 14 includes multiple sub-diffusers 142. Different sub-diffusers 142 are bent relative to the diffusion plate 5 and respectively attached to the bottom surface of the grooves 41. The sub-diffusers 142 are bonded to the bottom surface of the grooves 41 by diffusion adhesive 151. Figure 10 and Figure 11 As shown, the diffusion structure 14 is provided with a cutting seam line 141, which is located on the side of the diffusion black strip 9 near the lamp bead 62. The cutting seam line 141 is formed on the diffusion structure 14 by pre-cutting.

[0055] exist Figure 9 In the backlight module, the distance between the diffusion structure 14 and the LED 62 is L4, 0mm≤L4≤1.5mm; the dimension of the diffusion structure 14 in the thickness direction of the backlight module is H2, 0.3mm≤H2≤3mm; and the dimension of the sub-diffuser 142 in the length extension direction of the light-incident surface of the light guide plate 4 is L5, 1mm≤L5≤5mm. Figure 12 As shown.

[0056] like Figure 12 As shown, the LED 62 can be disposed on the side of the sub-diffuser 142 away from the bottom surface of the groove 41. A protrusion 42 is formed between adjacent grooves 41. The emitted light from the LED 62 is refracted through the protrusion 42 and guided to the arc-shaped corner adjacent to both ends in the length direction of the light guide plate 4, which can further reduce or even eliminate the shadow 200 of the arc-shaped corner. The angle α between the side surface of the protrusion 42 and the bottom surface of the groove 41 is greater than or equal to 60° and less than or equal to 110°.

[0057] like Figure 13As shown, to further optimize the shadow elimination effect of the arc-shaped corner, the included angle α between the side of the protrusion 42 and the bottom surface of the groove 41 is set to be greater than or equal to 80° and less than or equal to 90°. Along the length extension direction of the light-incident surface of the light guide plate 4, from the middle of the light-incident surface of the light guide plate 4 to both ends of the light-incident surface of the light guide plate 4, the included angle α between the side of the different protrusions 42 and the bottom surface of the groove 41 gradually increases. In the figure, α1 > α2 > α3 > α4.

[0058] like Figure 13 As shown, taking the LED 62 located in the middle of the light guide plate 4 as an example, from the middle of the light guide plate 4 to one end of the light guide plate 4, the obliquely emitted light from the LED 62 passes through the sides of different protrusions 42 sequentially from near to far. Each time it passes through the side of a protrusion 42, the light is refracted once. Each time it is refracted, the angle between the light and the bottom surface of the groove 41 decreases once, ultimately guiding the light to the shadow 200 of the arc-shaped corner, thus improving the physical limitation of the 120° emission angle of the LED 62. Without increasing the bezel 2 of the display device, in order to allow more light to enter the shadow 200 of the arc-shaped corner, the LED 62 can be placed on the side of the protrusion 42 away from the diffusion structure 14, and the LED 62 can be attached to the protrusion 42.

[0059] As mentioned earlier, the light intensity emitted directly above LED 62 is extremely high, easily creating a lamp eye 100. To better reduce the lamp eye 100, in... Figure 6 and Figure 9 In the thickness direction of the backlight module, an 18-layer screen printing ink can be set between the light guide plate 4 and the diffuser plate 5. The 18-layer screen printing ink can absorb and scatter some of the direct strong light, disperse the excessive light from the lamp eye 100, and make the brightness uniform. The orthographic projection of the 18-layer screen printing ink on the light guide plate 4 overlaps with the orthographic projection of the diffuser black strip 9 on the light guide plate 4.

[0060] This invention also provides a display device that may include the backlight module mentioned above. The specific structure and beneficial effects of the backlight module have been described in detail above, and therefore will not be repeated here.

[0061] It should be noted that, in addition to the backlight module, the display device also includes other necessary components and parts, such as the display layer, circuit board, power cord, etc. Those skilled in the art can make corresponding additions according to the specific usage requirements of the display device, which will not be elaborated here.

[0062] Display devices can be traditional electronic devices, such as mobile phones, computers, televisions, and video recorders, or emerging wearable devices, such as virtual reality devices and augmented reality devices, which will not be listed here.

[0063] It should be noted that the above embodiments are interconnected and can be combined to form other solutions. The solutions of the present invention are not limited to those described in the above embodiments. Those skilled in the art will readily conceive of other embodiments of the invention upon considering the specification and practicing the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the appended claims.

Claims

1. A backlight module, characterized in that, include: Light guide plate; The light strip includes at least one LED, wherein the at least one LED is disposed on the light-incident surface of the light guide plate; A diffusion structure is disposed between the light-incident surface of the lamp bead and the light guide plate.

2. The backlight module according to claim 1, characterized in that, The light strip includes multiple LED beads, which are arranged sequentially along the light-incident surface of the light guide plate. The backlight module also includes a diffusion adhesive layer, which is connected between the diffusion structure and the light guide plate.

3. The backlight module according to claim 2, characterized in that, The diffusion adhesive layer includes multiple diffusion adhesive portions. The orthographic projection of the diffusion adhesive portion on the light-incident surface of the light guide plate is located between the orthographic projections of the two adjacent LED beads on the light-incident surface of the light guide plate, or the orthographic projection of the diffusion adhesive layer on the light-incident surface of the light guide plate overlaps with the orthographic projection of the diffusion structure on the light-incident surface of the light guide plate.

4. The backlight module according to claim 2, characterized in that, The backlight module also includes a diffuser plate, which is disposed on the light-emitting side of the light guide plate. The diffuser structure is integrally formed with the diffuser plate, and a cutting seam is provided at the junction of the diffuser plate and the diffuser structure.

5. The backlight module according to claim 4, characterized in that, The light guide plate has multiple grooves on its light-incident surface. The diffusion structure includes multiple sub-diffusers, each of which is disposed within a groove. The diffusion adhesive layer includes multiple diffusion adhesive portions, and the sub-diffusers are bonded to the bottom surface of the groove via the diffusion adhesive portions.

6. The backlight module according to claim 5, characterized in that, A protrusion is formed between adjacent grooves, and the LED is located on the side of the sub-diffuser away from the bottom surface of the groove, and the LED is located on the side of the protrusion away from the diffuser structure.

7. The backlight module according to claim 6, characterized in that, The angle between the side of the protrusion and the bottom of the groove is greater than or equal to 60° and less than or equal to 110°.

8. The backlight module according to claim 7, characterized in that, The angle between the side of the protrusion and the bottom of the groove is greater than or equal to 80° and less than or equal to 90°. Along the length of the light-incident surface of the light guide plate, from the middle of the light-incident surface of the light guide plate to both ends of the light-incident surface of the light guide plate, the angle between the side of the protrusion and the bottom of the groove gradually increases.

9. The backlight module according to claim 4, characterized in that, The backlight module also includes a diffusion black strip, which is located on the side of the diffusion plate away from the light guide plate, and the cutting seam line is located on the side of the diffusion black strip closer to the LED.

10. The backlight module according to claim 3, characterized in that, The distance between the diffusion structure and the lamp bead is less than or equal to 1.5 mm. In the thickness direction of the backlight module, the size of the diffusion structure is greater than or equal to 0.3 mm and less than or equal to 3 mm. The sum of the thicknesses of the diffusion structure and the diffusion adhesive layer is greater than or equal to 0.07 mm and less than or equal to 1.5 mm. The size of the diffusion adhesive portion along the extension direction of the light-incident surface of the light guide plate is greater than or equal to 0.5 mm and less than or equal to 2 mm.

11. The backlight module according to claim 5, characterized in that, The distance between the diffusion structure and the lamp bead is less than or equal to 1.5 mm. In the thickness direction of the backlight module, the size of the diffusion structure is greater than or equal to 0.3 mm and less than or equal to 3 mm. In the length extension direction of the light-incident surface of the light guide plate, the size of the sub-diffuser is greater than or equal to 1 mm and less than or equal to 5 mm.

12. The backlight module according to claim 9, characterized in that, A screen printing ink layer is provided between the light guide plate and the diffuser plate, and the orthographic projection of the screen printing ink layer on the light guide plate overlaps with the orthographic projection of the diffuser black stripe on the light guide plate.

13. A display device, characterized in that, Includes the backlight module as described in any one of claims 1 to 12.

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