Backlight module, display module and display device

Abstract

The application discloses a backlight module, a display module and a display device. The backlight module of one embodiment comprises a back plate comprising a bottom wall and a side wall arranged on the bottom wall, the bottom wall and the side wall forming a groove; a light guide plate located in the groove, the light guide plate comprising opposite parallel first projection edges, opposite parallel second projection edges and at least two inclined projection edges connecting the first projection edges and the second projection edges in the orthographic projection of the bottom wall, the extension line of each first projection edge and the extension line of each second projection edge intersecting; an optical film located on the side of the light guide plate away from the bottom wall; and an angle-in light source located between the surface of the inclined projection edge of the light guide plate and the side wall, wherein the light guide plate comprises a first light guide area corresponding to a display area, a second light guide area at least partially surrounding the first light guide area and a light mixing structure located on the surface of the light guide plate on the side away from the bottom wall in the second light guide area, the reflectivity of the light mixing structure being greater than the transmittance.

Description

Technical Field

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

[0002] Currently, the mainstream method for LCD display products is edge-lit illumination, which connects the light source 14' (LED Bar) and the light guide plate 12 (Light Guide Plate) with tape, making it a surface light source for the module product. However, this requires a certain level of compatibility between the light source 14' (LED Bar) and the light guide plate 12 (Light Guide Plate), and because end customers have increasingly higher requirements for the display quality of display products, such as ultra-high contrast, high refresh rate, and high image quality, there are also higher requirements for the design of the backlight module. Summary of the Invention

[0003] The purpose of this invention is to provide a backlight module, a display module, and a display device to solve at least one of the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The first aspect of the present invention provides a backlight module, the backlight module comprising:

[0006] A back plate with grooves, the back plate including a bottom wall and side walls;

[0007] The light guide plate located in the groove has a projection on the bottom wall including a first projection edge that is relatively parallel, a second projection edge that is relatively parallel, and at least two inclined projection edges that connect the first projection edge and the second projection edge, wherein the extension line of each first projection edge and the extension line of each second projection edge intersect.

[0008] An optical film located on the side of the light guide plate away from the bottom wall; and

[0009] An angle-injected light source located between the surface of the inclined projection edge of the light guide plate and the sidewall.

[0010] The light guide plate includes:

[0011] The first light guide area corresponds to the display area;

[0012] A second light guide region that at least partially surrounds the first light guide region; and

[0013] The light mixing structure on the side of the light guide plate located away from the bottom wall in the second light guide area has a reflectivity greater than its transmittance.

[0014] Furthermore, the light mixing structure is disposed in the second light guide area where the tilted projection edge corresponding to the corner-entry light source is located, and in the second light guide area where the first projection edge and the second projection edge near the corner-entry light source are located.

[0015] Furthermore, in the extension direction parallel to the first projection edge, the center of the first light guide area is offset from the center of the second light guide area.

[0016] In the orthographic projection of the first light guide area onto the bottom wall, the first distance between the second projection edge and the projection boundary of the first light guide area corresponding to the second projection edge is greater than the second distance between the other second projection edge and the projection boundary of the first light guide area corresponding to the other second projection edge.

[0017] Furthermore, when the smaller second distance is less than a preset distance threshold, the inclined projection edge is not set between the other second projection edge and the first projection edge close to the other second projection edge.

[0018] Furthermore, the light mixing structure includes an uneven structure formed on the surface of the light guide plate away from the sidewall, the protrusions of the uneven structure extending along the direction from the bottom wall to the light guide plate.

[0019] Furthermore, the corner-in light source includes:

[0020] A circularly arranged substrate, the orthographic projection of which surrounds the first light-guiding area on the bottom wall; and

[0021] A light-emitting unit is inclinedly disposed at a position on the substrate corresponding to the inclined projection edge.

[0022] Furthermore, the light guide plate also includes:

[0023] The dot structure on the surface of the light guide plate near the bottom wall in the second light guide area includes a concave-convex structure on the surface of the light guide plate near the side wall.

[0024] Furthermore, the density of the dot structure on the side closer to the corner-in light source is less than the density of the dot structure on the side farther from the corner-in light source.

[0025] Furthermore, the backlight module also includes:

[0026] The first reflective sheet is located between the light guide plate and the bottom wall;

[0027] The second reflective sheet covers at least a portion of the side of the light guide plate corresponding to the first projection edge and the second projection edge.

[0028] Furthermore, the second reflective sheet includes:

[0029] The first sub-reflective sheet covering the side of the light guide plate;

[0030] A second sub-reflective sheet is located on the side of the light guide plate away from the bottom wall, and the orthographic projection of the second sub-reflective sheet on the bottom wall is located outside the orthographic projection of the first light guide area on the bottom wall;

[0031] And / or,

[0032] The second reflective sheet also includes a third sub-reflective sheet located on the side of the light guide plate near the bottom wall, wherein the orthographic projection of the third sub-reflective sheet on the bottom wall is located outside the orthographic projection of the first light guide area on the bottom wall.

[0033] Furthermore, the backlight module also includes a frame, the sidewall extends vertically, and the frame is snapped and fixed to the vertical surface of the sidewall.

[0034] Furthermore, in the extension direction of the first projection edge, the inclined projection edge and the first projection edge form an angle. When the length of the second projection edge remains unchanged, the smaller the length of the first projection edge, the larger the angle.

[0035] A second aspect of the present invention provides a display module, including a display panel located on the side of the optical film away from the bottom wall of the backlight module described in the first aspect of the present invention.

[0036] Furthermore, the display panel includes an adhesive layer that is bonded and fixed to the side of the backlight module's frame away from the bottom wall.

[0037] A third aspect of the present invention provides a display device, including the display module described in the second aspect of the present invention.

[0038] The beneficial effects of this invention are as follows:

[0039] In this embodiment of the invention, the light guide plate is treated with edge and corner removal, and the four corners are ground and polished to form a flat light-incident surface. The backlight module of this embodiment of the invention does not need to be designed based on the A / P value, effectively solving the hotspot problem. Attached Figure Description

[0040] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0041] Figure 1 A schematic diagram showing the top view of the backlight module of the related technology;

[0042] Figure 2 A schematic diagram illustrating the light propagation of a light guide plate in a related technology is shown.

[0043] Figure 3This diagram illustrates the stacked structure of a backlight module according to an embodiment of the present invention.

[0044] Figure 4 This diagram illustrates the structure of a backlight module according to an embodiment of the present invention.

[0045] Figure 5 This diagram illustrates the distribution of the light mixing structure according to an optional embodiment of the present invention.

[0046] Figure 6 and Figure 7 Schematic diagrams of the light mixing structures of different embodiments of the present invention are shown;

[0047] Figure 8 This diagram illustrates the structure of an angle-injected light source according to an embodiment of the present invention.

[0048] Figures 9-11 This invention provides a schematic diagram showing the structure of the second reflective sheet at different positions according to an embodiment of the invention.

[0049] Figure 12 A schematic diagram of the structure of a display module related to the technology is shown;

[0050] Figure 13 A schematic diagram of the structure of a display module according to a second embodiment of the present invention is shown. Detailed Implementation

[0051] To more clearly illustrate the present invention, the following description, in conjunction with embodiments and accompanying drawings, further explains the invention. Similar components in the drawings are indicated by the same reference numerals. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be construed as limiting the scope of protection of the present invention.

[0052] Figure 1 and Figure 2 This is a schematic diagram illustrating the connection between the light source 14' and the light guide plate 12 in a side-lit backlight module of a related technology. Figure 1 and Figure 2 As shown, the LED plate (LGP) is typically bonded to the flexible printed circuit board (FPC) of the LED bar using adhesive tape, ensuring close contact between the light-emitting surface of the LED bar and the light-receiving surface of the LGP. Figure 2 As shown, light enters from the incident surface, is reflected by the dot surface of the LGP, and exits from the emitting surface.

[0053] In related technologies, the A / P value is often used as a design principle for backlight modules, which refers to the matching between the light source 14' (LED Bar) and the light guide plate 12 (Light Guide Plate). The A value represents the distance from the light incident surface to the AA area, and the P value represents the distance between the center points of two adjacent LED beads of the LED Bar.

[0054] The A / P value design affects the image quality (hotspot) on the light-incident side. Common defects include light shadows (hotspots) and dark areas. A balance needs to be found between the A and P values. Generally, an A / P value greater than 1.3 effectively reduces hotspot phenomena. However, in actual product design, considering the overall power consumption of the BLU, the space for modifying the LED bar pitch value is limited, the P value of the LED bar is basically fixed, and the A value in the LGP is also limited by the bezel size. Therefore, designing based on the A / P value imposes significant restrictions on the backlight module design, thus lengthening the entire product manufacturing cycle.

[0055] In view of this, the present invention provides a backlight module, a display module, and a display device to solve the above problems.

[0056] The first embodiment of the present invention proposes a backlight module, such as Figures 3 to 12 As shown, the backlight module 10 includes:

[0057] Back plate 11, the back plate 11 includes a bottom wall 111 and a side wall 112 disposed on the bottom wall 111, the bottom wall 111 and the side wall 112 forming a groove;

[0058] The light guide plate 12 located in the groove has a projection on the bottom wall 111 including a first projection edge 121 that is relatively parallel, a second projection edge 122 that is relatively parallel, and at least two inclined projection edges 123 that connect the first projection edge 121 and the second projection edge 122, wherein the extension line of each first projection edge 121 and the extension line of each second projection edge 122 intersect.

[0059] The optical film 13 located on the side of the light guide plate 12 away from the bottom wall 111; and

[0060] The corner-in light source 14 is located between the surface of the inclined projection edge 123 of the light guide plate 12 and the side wall 112.

[0061] The light guide plate 12 includes:

[0062] The first light guide area 124, for example, corresponds to the display area of ​​the display panel;

[0063] A second light guide region 125 at least partially surrounds the first light guide region 124; and

[0064] The light mixing structure 126 located on the surface of the light guide plate 12 in the second light guide area 125 away from the bottom wall 111 has a reflectivity greater than a transmittance.

[0065] The light emission principle of the backlight module 10 according to an embodiment of the present invention will now be explained. The corner-incident light source 14 is incident through the surface of the light guide plate 12 corresponding to the inclined projection edge 123. The light mixing structure 126 is used to reflect the light incident through the surface of the light guide plate 12 corresponding to the inclined projection edge 123 multiple times, so that the light reflected multiple times is mixed and enhanced in the light guide plate 12 corresponding to the second light guide area 125. Through the design of the mixed structure of the corner-incident light source 14 and the second light guide area 125 of the light guide plate 12, the light from the corner-incident light source 14 forms a strip-shaped light-emitting area in the second light guide area 125. Under this design, the brightness of the backlight module 10 is determined by the corner-incident light source 14 and the light mixing structure 126. The strip-shaped light-emitting area serves as the main light source of the backlight module 10 and propagates to the first light guide area 124 corresponding to the display area to achieve display.

[0066] In this embodiment of the invention, the reflectivity of the light mixing structure 126 is greater than its transmittance. In other words, the light mixing structure 126 can retain most of the light incident on the second light guide area 125, reduce the light loss of the corner-incident light source 14, and thus improve the luminous brightness of the backlight module 10.

[0067] In this embodiment of the invention, the light guide plate 12 is treated with edge and corner removal, and the four corners are ground and polished to form a planar light-incident surface. That is, in this embodiment of the invention, the rectangular light guide plate 12 commonly used in related technologies is set as a polygon with inclined sides, and the direct-lit light source and the side-lit light source are eliminated. Through these settings, the backlight module 10 of this embodiment of the invention can break the design criteria based on the A / P value of related technologies.

[0068] In this embodiment of the invention, the backlight module 10 removes the light-emitting surface of the LED that was originally in contact with the LGP side. Theoretically, the distance between the LED and the display area (AA area) is infinitely large, the P value is fixed, and the A / P value is theoretically infinitely large. Therefore, the A / P value under the design will no longer be considered. In other words, the surface of the display area near the corner-lit light source 14 and the light-emitting surface of the corner-lit light source 14 are no longer in the same space. That is, the backlight module 10 of this embodiment of the invention does not need to use the A / P value as a design criterion, effectively solving the hotspot problem.

[0069] In an optional embodiment, the light mixing structure 126 is disposed in the second light guide area 125 where the tilted projection edge 123 corresponding to the corner-in light source 14 is located, and in the second light guide area 125 where the first projection edge 121 and the second projection edge 122 near the corner-in light source 14 are located.

[0070] In other words, the light mixing structure 126 in this embodiment of the invention is configured according to the corner-in light source 14. When the corner-in light source 14 is positioned differently, the light mixing structure 126 is distributed at different positions in the second light guide area 125.

[0071] In an optional embodiment, such as Figure 4 As shown, the second projection edge 122 includes a first side edge 1221 and a second side edge 1222 parallel to the first side edge 1221. In the orthographic projection of the first light guide area 124 onto the bottom wall 111, the first distance d1 of the first side edge 1221 from the projection boundary of the adjacent first light guide area 124 is greater than the second distance d2 of the second side edge 1222 from the projection boundary of the adjacent first light guide area 124.

[0072] In other words, such as Figure 4 As shown, the center of the display area and the center of the light guide plate 12 are different. Considering that an electrode area is also provided on the display panel that matches the backlight module 10, the size of the second light guide area 125 is determined according to the electrode area of ​​the display panel. For example, as shown... Figure 4 As shown, the second light guide area 125 corresponding to the larger first distance d1 corresponds to the electrode area of ​​the display panel and is used to lay out electrode traces.

[0073] In an optional embodiment, such as Figure 5 As shown, when the smaller second distance d2 is less than the preset distance threshold, the tilted projection edge 123 is only set between the first side edge 1221 and the first projection edge 121 that is close to the first side edge 1221. Based on this setting, a narrow bezel design can be achieved.

[0074] Based on this structure, due to the size setting, it is difficult to design the light guide plate 12 to remove the corners. Therefore, when the second distance d2 is small, the corresponding second projection edge 122 and the first projection edge 121 adjacent to the second projection edge 122 are not designed with an inclined projection edge 123.

[0075] Based on the same principle, when the tilted projection edge 123 is not provided, the corner-lit light source 14 is also not provided at that position, ensuring that the overall size and manufacturing process of the backlight module 10 can meet the design requirements. In this embodiment, the light mixing structure 126 corresponding to the corner-lit light source 14 also has the same correspondence, that is, at the position of the second light guide area 125 that can be illuminated by the light from the corner-lit light source 14. In a specific example, such as Figure 5 As shown, the corner-in light source 14 is positioned at both ends of the second light guide area 125 corresponding to the larger first distance d1. Correspondingly, the light mixing structure 126 is positioned at the location of the second light guide area 125 that can be illuminated by the corner-in light source 14, for example, as shown in the figure. Figure 5 The positions of the first side 1221 and the second light guide area 125 corresponding to the first projection edge 121 near the first side 1221 are shown. In other words, the light mixing structure 126 is not provided at the position of the second light guide area 125 corresponding to the second side 1222.

[0076] Based on the above description, the embodiments of the present invention are set at different positions according to the position of the corner-in light source 14. Those skilled in the art can design according to actual applications, and will not elaborate further here.

[0077] Based on the above design, the number of corner-lit light sources is reduced, and therefore the brightness of the backlight module 10 will be reduced. In an optional embodiment, the overall brightness of the backlight module 10 can be compensated by adjusting the material of the optical film 13.

[0078] In one specific example, the optical film 13 includes a brightness enhancement film 131, a diffuser 132, and a prism sheet (not shown), and can be selected as a material with high brightness gain to improve the display effect of the backlight module 10.

[0079] In an optional embodiment, such as Figure 6 and Figure 7 As shown, the light mixing structure 126 includes a concave-convex structure formed on the surface of the light guide plate 12 away from the side wall 112, and the protrusions of the concave-convex structure extend along the direction from the bottom wall 111 to the light guide plate 12.

[0080] In a specific example, such as Figure 6 The light mixing structure 126 shown is conical; in another example, as shown in the figure, the light mixing structure 126 is hemispherical. Figure 6 and Figure 7 The light mixing structure 126 shown is merely an illustrative example; those skilled in the art can design it according to actual applications.

[0081] In a specific example, the refractive index of the material of the light mixing structure 126 is the same as that of the material of the light guide plate 12. When the incident light passes through the light mixing structure 126, total internal reflection occurs within the range of the light mixing structure 126, so that the light efficiency of the incident light side is fully utilized and the problem of dimming on the incident light side is improved.

[0082] In a specific example, the edge design principle of the light mixing structure 126 is consistent with the edge design principle of the display panel. The light mixing structure 126 extends all the way to the edge of the first light guide area 124 (i.e., the display area). The light mixing structure 126 closest to the first light guide area 124 has a machining precision tolerance from the edge of the first light guide area 124 (i.e., the display area), for example, designed to be 0.2mm.

[0083] In one specific example, the light mixing structure 126 can be fixed to the light guide plate 12 by applying a layer of resin adhesive through UV curing.

[0084] In an optional embodiment, such as Figure 6 and Figure 7 As shown, the light guide plate 12 further includes:

[0085] The dot structure 127 on the surface of the light guide plate 12 near the bottom wall 111 in the second light guide area 125 includes a concave-convex structure on the surface of the light guide plate 12 near the side wall 112. This arrangement can improve the display brightness of the backlight module 10.

[0086] In an optional embodiment, the density of the dot structure 127 on the side closer to the corner-in light source 14 is less than the density of the dot structure 127 on the side farther from the corner-in light source 14. In this embodiment, the dot surface is arranged frontally, with fewer dots closer to the light source to ensure display uniformity. The specific size design of the light mixing structure 126 and the dot density layout are finely adjusted according to the final backlight module 10 and the display screen of the display module.

[0087] In an optional embodiment, such as Figure 8 As shown, the corner-in light source 14 includes:

[0088] A circularly arranged substrate 141, the orthographic projection of which surrounds the first light-guiding area 124 on the bottom wall 111; and

[0089] A light-emitting unit 142 is disposed at an angle to the substrate 141 corresponding to the angled projection edge 123.

[0090] Therefore, the present invention is based on the design of the corner-entry light source 14. Unlike the strip-shaped side-entry light source, the corner-entry light source 14 of the present invention and the light mixing structure 126 of the aforementioned embodiment are designed to form a novel backlight module 10 structure.

[0091] In an optional embodiment, such as Figure 3 as well as Figures 9-11 As shown, the backlight module 10 further includes:

[0092] The first reflective sheet 15 is located between the light guide plate 12 and the bottom wall 111;

[0093] The second reflective sheet 16 covers at least a portion of the side of the light guide plate 12 corresponding to the first projection edge 121 and the second projection edge 122.

[0094] like Figure 3 As shown, the first reflective sheet 15 is horizontally placed between the light guide plate 12 and the bottom wall 111 to reflect the light emitted to the bottom wall 111 into the interior of the light guide plate 12, thereby increasing the reflectivity of the light and thus increasing the display brightness of the backlight module 10.

[0095] In this embodiment, as Figure 9As shown, the second reflector 16 has a vertically arranged portion for reflecting the light emitted from the side wall 112 of the light guide plate 12 into the interior of the light guide plate 12, thereby increasing the reflectivity of the light and further improving the display brightness of the backlight module 10.

[0096] Furthermore, such as Figure 10 and Figure 11 As shown, the second reflector 16 in this embodiment may also have a horizontally arranged portion. In an optional embodiment, the second reflector 16 includes:

[0097] The first sub-reflective sheet 161 covers the side of the light guide plate 12;

[0098] The second sub-reflective sheet 162 is located on the side of the light guide plate 12 away from the bottom wall 111. The orthographic projection of the second sub-reflective sheet 162 on the bottom wall 111 is located outside the orthographic projection of the first light guide area 124 on the bottom wall 111.

[0099] In this structure, the second reflective sheet 16 has an "L" shape, comprising not only a vertically arranged first sub-reflective sheet 161 covering the side, but also a horizontally arranged second sub-reflective sheet 162. The second sub-reflective sheet 162 is disposed on the upper surface of the light guide plate 12, above the light mixing structure 126 of the second light guide area 125, reflecting the light lost by the second light guide area 125 to ensure display effect. In this embodiment of the invention, the second sub-reflective sheet 162 will not interfere with the first light guide area 124, that is, it will not interfere with the display area, thus not affecting the light emission effect.

[0100] In another alternative embodiment, such as Figure 11 As shown, the second reflective sheet 16 also includes a third sub-reflective sheet 163 located on the side of the light guide plate 12 near the bottom wall 111. The orthographic projection of the third sub-reflective sheet 163 on the bottom wall 111 is located outside the orthographic projection of the first light guide area 124 on the bottom wall 111, reflecting the lost light emitted below the second light guide area 125 to ensure the display effect.

[0101] Furthermore, the orthographic projection of the third sub-reflector 163 onto the bottom wall and the orthographic projection of the first reflector 15 onto the bottom wall do not overlap; that is, the third sub-reflector 163 and the first reflector 15 do not interfere with each other. This ensures the overall assembly performance of the backlight module 10 while improving the display effect. Compared to related technologies... Figure 12 The side-lit light source display module structure shown has a second reflector 16 located at the corner of the U-shaped back plate. The second reflector 16 in this embodiment of the invention has a closer reflective surface, which reduces light loss.

[0102] In an optional embodiment, such as Figure 3As shown, the backlight module 10 further includes a frame 17, and the sidewall 112 extends vertically. The frame 17 is snap-fitted and fixed to the vertical surface of the sidewall 112. Based on the configuration of this embodiment, compared to related technologies... Figure 12 The side-lit light source display module structure shown in this embodiment of the invention eliminates the U-fold support structure of the back plate 11 in the backlight module 10. The horizontal surface of the frame 17 away from the bottom wall 111 is used as the support surface of the display panel 20. With this setting, the bezel thickness of the display product can be reduced, especially the bezel thickness on the electrode area side of the display panel 20.

[0103] In an optional embodiment, such as Figure 4 As shown, in the extension direction of the first projection edge 121, the inclined projection edge 123 and the first projection edge 121 form an angle α. When the length of the second projection edge 122 remains constant, the smaller the length of the first projection edge 121, the larger the angle α. In other words, this embodiment designs the tilt angle of the inclined projection edge 123 according to the display size, balances the brightness of the required light in different directions, and maximizes the display effect while addressing the potential problem of low brightness caused by using the corner-in light source 14 as the light source.

[0104] Furthermore, the material of the optical film 13 is adjusted to compensate for the overall brightness of the backlight module 10. In a specific example, the optical film 13 includes a brightness enhancement sheet 131, a diffuser sheet 132, and a prism sheet (not shown in the figure), and materials with high brightness gain can be selected to improve the display effect of the backlight module 10.

[0105] Another embodiment of the present invention provides a display module, including a display panel 20 located on the side of the optical film 13 away from the bottom wall 111 of the backlight module 10 of the above embodiment of the present invention.

[0106] In an optional embodiment, the display panel includes a display area and an electrode area located on one side of the display area, wherein the orthographic projection of the display area onto the backlight module coincides with the orthographic projection of the first light guide area onto the backlight module, and the electrode area is located on one side of the first side corresponding to the larger first distance of the backlight module, thereby realizing the structural matching design of the display panel and the backlight module.

[0107] In an optional embodiment, such as Figure 13As shown, the display panel 20 includes an adhesive layer 21, which is bonded and fixed to the side of the backlight module 10's frame 17 away from the bottom wall 111. In this embodiment of the invention, when the backlight module 10 and the display panel 20 are fixed by the adhesive layer 21, the light-shielding effect of the adhesive layer 21 is amplified, effectively shielding against light leakage, hotspots, and other defects in the electrode area (DP side) of the display panel 20.

[0108] It is worth noting that the specific embodiments of the display module of the present invention can be found in the backlight module 10 of the foregoing embodiments, and will not be repeated here.

[0109] Another embodiment of the present invention provides a display device, including the display module described in the above embodiments of the present invention. The display device can be any product or component with display function, such as electronic paper, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator; this embodiment does not limit this.

[0110] In the description of this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0111] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A backlight module, characterized in that, The backlight module includes: A back plate, the back plate including a bottom wall and a side wall disposed on the bottom wall, the bottom wall and the side wall forming a groove; The light guide plate located in the groove has a projection on the bottom wall including a first projection edge that is relatively parallel, a second projection edge that is relatively parallel, and at least two inclined projection edges that connect the first projection edge and the second projection edge, wherein the extension line of each first projection edge and the extension line of each second projection edge intersect. An optical film located on the side of the light guide plate away from the bottom wall; and An angle-injected light source located between the surface of the inclined projection edge of the light guide plate and the sidewall. The light guide plate includes: First light guide area; A second light guide region that at least partially surrounds the first light guide region; and The light mixing structure on the surface of the light guide plate located in the second light guide area away from the bottom wall has a reflectivity greater than a transmittance. The light mixing structure is disposed in the second light guide area where the tilted projection edge corresponding to the corner-entry light source is located, and in the second light guide area where the first projection edge and the second projection edge near the corner-entry light source are located.

2. The backlight module according to claim 1, characterized in that, The second projection edge includes a first side edge and a second side edge parallel to the first side edge. In the orthographic projection of the first light guide area onto the bottom wall, the first distance between the first side and the projection boundary of the first light guide area is greater than the second distance between the second side and the projection boundary of the first light guide area.

3. The backlight module of claim 2, wherein, When the second distance is less than a preset distance threshold, the tilted projection edge is positioned between the first side and the first projection edge that is close to the first side.

4. The backlight module of claim 1, wherein, The light mixing structure includes a concave-convex structure formed on the surface of the light guide plate away from the sidewall, the protrusions of the concave-convex structure extending along the direction from the bottom wall to the light guide plate.

5. The backlight module of claim 1, wherein, The light guide plate also includes: The dot structure on the surface of the light guide plate near the bottom wall in the second light guide area includes a concave-convex structure on the surface of the light guide plate near the side wall.

6. The backlight module of claim 5, wherein, The density of the dot structure on the side closer to the corner-in light source is less than the density of the dot structure on the side farther away from the corner-in light source.

7. The backlight module of claim 1, wherein, The backlight module also includes: The first reflective sheet is located between the light guide plate and the bottom wall; The second reflective sheet covers at least a portion of the side of the light guide plate corresponding to the first projection edge and the second projection edge.

8. The backlight module of claim 7, wherein, The second reflective sheet includes: The first sub-reflective sheet covering the side of the light guide plate; A second sub-reflective sheet is located on the side of the light guide plate away from the bottom wall, and the orthographic projection of the second sub-reflective sheet on the bottom wall is located outside the orthographic projection of the first light guide area on the bottom wall; And / or, The second reflective sheet also includes a third sub-reflective sheet located on the side of the light guide plate near the bottom wall, wherein the orthographic projection of the third sub-reflective sheet on the bottom wall is located outside the orthographic projection of the first light guide area on the bottom wall.

9. The backlight module according to claim 1, characterized in that, The backlight module also includes a frame, the sidewall extends vertically, and the frame is snapped and fixed to the vertical surface of the sidewall.

10. A display module, characterized by A display panel comprising the backlight module of any one of claims 2 to 3 located on the side of the optical film away from the bottom wall.

11. The display module of claim 10, wherein, The display panel includes a display area and an electrode area located on one side of the display area. Wherein, the orthographic projection of the display area onto the backlight module coincides with the orthographic projection of the first light guide area onto the backlight module. The electrode area is located on one side of the first side of the backlight module.

12. A display device, characterized by comprising: Includes the display module according to any one of claims 10 or 11.

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