Backlight module, display module and display device

Abstract

The utility model provides a backlight module, a display module and a display device. The backlight module comprises a back plate, an iron frame, a light guide plate and an optical film material. The back plate comprises a bottom wall and a plurality of first side walls arranged around the bottom wall, the bottom wall and the side walls define a containing space with an opening in the top, the first side walls comprise first sub-walls oppositely arranged in the first direction and second sub-walls oppositely arranged in the second direction, and at least one first sub-wall comprises a first notch; the first notch is not in contact with the bottom wall in the height direction, extends in the length direction of the first sub-wall and is not in contact with the second sub-wall. The iron frame comprises a second side wall and a flange, the second side wall is located on the outer side of the first side wall, and the flange is arranged at the end, away from the bottom wall, of the second side wall and extends in the direction of reducing the opening. The optical film material is farther away from the bottom wall of the back plate than the light guide plate, and the flanges are used for limiting the light guide plate and the optical film material. The backlight module is provided with a narrow frame, and the problem of edge bright lines is not prone to occurring.

Description

Technical Field

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

[0002] As the new energy vehicle market matures, the use of in-vehicle displays is becoming increasingly widespread, with increasingly diverse application scenarios. A display on the steering wheel can replace the instrument panel, displaying information such as vehicle speed and temperature. However, the space for a display on the steering wheel is limited. To expand the display area, designing the display with a narrow bezel is one option. Therefore, a design solution for a narrow bezel is urgently needed. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide a backlight module, a display module, and a display device to achieve a narrow frame design of the display module. The specific technical solution is as follows:

[0004] According to a first aspect of the present application, there is provided a backlight module, comprising: a back panel, comprising a bottom wall and a plurality of first side walls arranged around the bottom wall, the bottom wall and the side walls forming a receiving space with a top opening, the first side walls comprising a first sub-wall arranged opposite to each other along a first direction and a second sub-wall arranged opposite to each other along a second direction, at least one of the first sub-walls comprising a first notch, the first notch not contacting the bottom wall along the height direction, the first notch extending along the length direction of the first sub-wall and not contacting the second sub-wall; an iron frame comprising a second side wall and a rib, the second side wall being located on the outside of the first side wall, the rib being located at an end of the second side wall away from the bottom wall and extending in a direction to reduce the opening; a light guide plate and an optical film material, the optical film material being further away from the bottom wall of the back panel than the light guide plate, and the rib being used to limit the light guide plate and the optical film material.

[0005] In some embodiments, the bottom wall includes first side edges opposite to each other along the first direction and second side edges opposite to each other along the second direction, the corner between at least one of the first side edges and one of the second side edges is a rounded corner, and the first sub-wall and the second sub-wall are provided with a second notch at the position corresponding to the rounded corner, and the second notch extends along the height direction to the bottom wall.

[0006] In some embodiments, both the first notch and the second notch are provided, and the first notch and the second notch are provided on the same side and are connected.

[0007] In some embodiments, both of the two first sub-walls include the first notch; the corners between the two first side edges and one of the second side edges are rounded corners, and the first sub-wall and the second sub-wall are provided with the second notch at positions corresponding to the rounded corners; the first notch and the second notch are connected.

[0008] In some embodiments, the corner between two of the first side edges and another of the second side edges is a right angle; the display module includes a visual area, the visual area includes a first boundary relatively set along a first direction and a second boundary relatively set along the second direction, and the third boundary of the first notch close to the right angle side is located outside the second boundary of the visual area close to the right angle side.

[0009] In some embodiments, a distance between a third boundary of the first notch close to the right angle side and the second boundary of the visible area close to the right angle side is 1 mm-2 mm.

[0010] In some embodiments, the iron frame includes a third notch, the third notch is provided at the rounded corner position, and is arranged opposite to the bottom wall in a direction away from the back plate;

[0011] The display module includes a light shielding member, which is arranged on the outer side of the second side wall and is used to cover the third gap.

[0012] In some embodiments, the display module includes a light absorbing member, which is disposed on an inner side of the second side wall and is respectively disposed opposite to the first notch and the second notch in a direction away from the optical film material.

[0013] In some embodiments, the optical film material includes a diffuser, the diffuser is arranged in contact with the light guide plate, and the edge of the diffuser is coated with a light-shielding material, and the coating width of the light-shielding material is 0.5 mm-2 mm.

[0014] In some embodiments, the light-shielding material is ink, and the grayscale of the ink is 40%-65%.

[0015] A second aspect of the present application provides a display module, which includes: a cover plate, a display panel and a backlight module, wherein the display panel is bonded to the cover plate; the backlight module is the backlight module described above, and the backlight module is bonded to the display panel.

[0016] A third aspect of the present application provides a display device, which includes the above-mentioned display module.

[0017] The embodiments of the present application provide a backlight module, a display module, and a display device, wherein the back panel of the backlight module only includes a bottom wall and a first side wall, and the first side wall does not include a side rib, that is, the first side wall does not include a flange set in the direction of reducing the opening, and the limiting of the light guide plate and the optical film material is achieved by the rib of the iron frame. The back panel does not include a side rib, which can reduce the gap between the back panel and the light guide plate and the optical film material, thereby further reducing the size of the frame, thereby achieving the purpose of expanding the display area of ​​the display module and increasing the user experience. By providing a first notch on the first sub-wall of the first side wall, the distance from the optical film material to the effective display area can be increased. On the one hand, the risk of bright edges appearing at the edge of the display module can be reduced, and on the other hand, sufficient expansion gap can be reserved for the optical film material. Therefore, not only the narrow frame design of the display module is achieved, but also the display effect of the display module can be guaranteed, thereby increasing the user experience.

[0018] Of course, any product implementing the present application does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the structure of the display module after removing the display panel and cover plate;

[0021] Figure 2a To display the module Figure 1 Cross-section at the middle AA position;

[0022] Figure 2b To display the module Figure 1 Cross-section view of the middle BB position;

[0023] Figure 3 A structural diagram of the backlight module when the iron frame is removed from one perspective;

[0024] Figure 4 This is a structural diagram of the backlight module from another perspective when the iron frame is removed;

[0025] Figure 5 To display the module Figure 1 Cross-sectional view at the mid-CC position;

[0026] Figure 6 To display the module Figure 1 Cross-sectional view at the mid-DD position;

[0027] Figure 7 To display the module Figure 1 Cross-sectional view at the middle EE position;

[0028] Figure 8 For Figure 1 Schematic diagram of the structure with an iron frame added to the outside of the middle back plate;

[0029] Figure 9 For Figure 8 A schematic diagram of a structure in which a light shielding member is added on the basis of FIG.

[0030] Figure 10 Schematic diagram of the structure of the backlight module;

[0031] Figure 11 Schematic diagram of the structure of the diffuser.

[0032] The reference numerals are as follows:

[0033] Cover plate 1; optical adhesive 11; display panel 2; VHB double-sided adhesive tape 21; back plate 3; bottom wall 31; first side edge 311; second side edge 312; first side wall 32; first sub-wall 321; first notch 3211; third boundary 3211a; second sub-wall 322; second notch 323; iron frame 4; second side wall 41; retaining edge 42; third notch 43; light guide plate 5; optical film 6; diffuser 61; prism sheet 62; composite brightness enhancement film 63; light shielding member 7; light absorbing member 8; light shielding material 9; frame L; amount of laminated material L1; spacing L2; distance L3; effective display area Z1; visible area Z2; first boundary Z21; second boundary Z22; first direction X; second direction Y. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field based on this application are within the scope of protection of this application.

[0035] In order to expand the display area, the border L needs to be reduced while keeping the display module size unchanged. Figure 1 , Figure 1 This is a schematic diagram of the structure of the display module after removing the display panel 2 and the cover plate 1. Figure 1As shown, the frame L refers to the distance from the outer boundary of the active display area (Active Area, AA area) to the outermost edge of the display module. Taking into account the inevitable assembly errors in the assembly process, in order to ensure that the range of the effective display area of ​​the display module is not affected by the assembly errors, the display module includes a visual area (Visual Area, VA area), that is, an area that can display clear images. This area is usually larger than the effective display area Z1, including the effective display area Z1 and the surrounding black border area, so even if there is an assembly error, it can ensure that the range of the effective display area is not affected. The spacing L2 between the visual area Z2 and the effective display area Z1 is generally not much different. For example, the spacing L2 between the effective display area Z1 and the visual area Z2 can be 0.4mm-0.6mm. Exemplarily, the spacing L2 can be 0.5mm. There is basically no space for reduction between the visual area Z2 and the effective display area Z1, so reducing the frame L is actually reducing the distance from the outer boundary of the visual area to the outermost edge of the display module.

[0036] To this end, the present application embodiment proposes a display module, such as Figure 2a and Figure 2b As shown, Figure 2a To display the module Figure 1 Cross-section diagram at the AA position, Figure 2b To display the module Figure 1 The display module includes a cover plate 1, a display panel 2, and a backlight module. The display panel 2 is bonded to the cover plate 1, and the backlight module is bonded to the display panel 2.

[0037] In this embodiment, the cover plate 1 is bonded to the display panel 2, and the display panel 2 is bonded to the backlight module, thereby achieving bonding of the cover plate 1, the display module and the backlight module. Compared with bonding the backlight module to the cover plate 1, the backlight module needs to be arranged around the periphery of the display panel 2 so that it can be bonded to the cover plate 1. In this embodiment, the cover plate 1, the display panel 2 and the backlight module are bonded in sequence, which can reduce the frame L of the display module.

[0038] The cover plate 1 and the display panel 2 can be bonded together by transparent optical adhesive 11, and the bonding between the display panel 2 and the backlight module is achieved by bonding the iron frame 4 and the display panel 2, which can be bonded together by VHB double-sided adhesive 21 (Very High Bond), which is made of acrylic material as a whole.

[0039] However, if you want to further reduce the size of the frame L, the thickness of the back plate 3 and the thickness of the iron frame 4 are both limiting factors, because the back plate 3 and the iron frame 4 both occupy the space of the frame L. Reducing the frame L will make the edge of the film material and the light guide plate 5 too close to the effective display area Z1, which is prone to edge bright edge problems. In order to avoid the edge bright edge phenomenon, the optical film material 6 and the light guide plate 5 are required to have a certain amount of film material L1. The amount of film material L1 refers to the area where the edge of the film material is covered by the edge 42 of the iron frame 4. In theory, the amount of film material L1 should be greater than or equal to 0.9 mm. Therefore, in order to achieve the narrow frame L design of the display module, it is necessary to ensure that the amount of film material L1 meets the requirements.

[0040] To this end, the present invention provides a backlight module. Figure 3 、 Figure 4 and Figure 5 , Figure 3 This is a structural diagram of the backlight module when the iron frame 4 is removed from one viewing angle. Figure 4 This is a structural diagram of the backlight module from another perspective when the iron frame 4 is removed. Figure 5 To display the module Figure 1 Cross-sectional view at the center CC position.

[0041] The backlight module includes a backplate 3, an iron frame 4, a light guide plate 5, and an optical film 6. The backplate 3 includes a bottom wall 31 and a plurality of first side walls 32 disposed around the bottom wall 31. The bottom wall 31 and the side walls form a receiving space with an open top. The first side walls 32 include first sub-walls 321 disposed opposite each other along a first direction X and second sub-walls 322 disposed opposite each other along a second direction Y. At least one of the first sub-walls 321 includes a first notch 3211. The first notch 3211 does not contact the bottom wall 31 along the height direction. The first notch 3211 extends along the length direction of the first sub-wall 321 and does not contact the second sub-wall 322. The iron frame 4 includes a second side wall 41 and a rib 42. The second side wall 41 is located outside the first side wall 32. The rib 42 is disposed at the end of the second side wall 41 away from the bottom wall 31 and extends in a direction that reduces the opening. The optical film 6 is further away from the bottom wall 31 of the back plate 3 than the light guide plate 5 . The retaining edge 42 is used to limit the position of the light guide plate 5 and the optical film 6 .

[0042] In this embodiment, the back panel 3 includes only a bottom wall 31 and a first side wall 32. The first side wall 32 does not include a side rib 42, that is, the first side wall 32 does not include a flange arranged in the direction of reducing the opening. The light guide plate 5 and the optical film 6 are limited by the rib 42 of the iron frame 4. The back panel 3 does not include a side rib 42, which can reduce the gap between the back panel 3 and the light guide plate 5 and the optical film 6, thereby further reducing the size of the frame L, thereby achieving the purpose of expanding the display area of ​​the display module and improving the user experience. By providing a first notch 3211 on the first sub-wall 321 of the first side wall 32, the distance between the optical film 6 and the effective display area Z1 can be increased. On the one hand, this can reduce the risk of bright edges on the edge of the display module, and on the other hand, it can reserve sufficient expansion space for the optical film 6. Therefore, not only a narrow frame L design of the display module is achieved, but also the display effect of the display module is guaranteed, improving the user experience. In addition, the back panel 3 does not include a side rib 42, which also helps to reduce the thickness of the display module.

[0043] The first notch 3211 can be provided in only one of the first sub-walls 321, or can be provided in both first sub-walls 321. Figure 3 and Figure 4 The first notch 3211 is provided on both first sub-walls 321 for illustration. The first notch 3211 does not contact the bottom wall 31, that is, the first notch 3211 does not penetrate the first sub-wall 321 in the height direction, so that the first sub-wall 321 can limit the light guide plate 5 located below the optical film 6. The first notch 3211 does not contact the second sub-wall 322, that is, the length of the first notch 3211 is less than the length of the first sub-wall 321, that is, the first sub-wall 321 adjacent to the second sub-wall 322 is retained, and the two first sub-walls 321 can limit the optical film 6 in the middle to prevent the optical film 6 from moving arbitrarily in the directions relative to the two first sub-walls 321. The setting of the first notch 3211 is used to avoid the optical film 6 in the height direction, increase the amount of film material L1 pressed by the retaining edge 42 on the optical film 6, so that the retaining edge 42 of the iron frame 4 can better block the edge of the optical film 6, reducing the possibility of forming a bright edge on the edge of the optical film 6 under a wide viewing angle. For the position where the first notch 3211 is located, due to the avoidance of the first sub-wall 321 of the back panel 3 at this position, the length of the optical film material 6 can be increased by a dimension equivalent to the thickness of the back panel 3. Therefore, at the position of the first notch 3211, the amount of pressed film material L1 can be 1.2mm-1.4mm, for example, it can be 1.35mm. That is, by setting the first notch 3211, the frame L is reduced and the requirement of the amount of pressed film material L1 is met.

[0044] The first direction X can be the long side direction of the display module or the short side direction of the display module. When the first direction X is the long side direction, the first sub-wall 321 and the second sub-wall 322 are the two short sides of the display module. When the first direction X is the short side direction, the first sub-wall 321 and the second sub-wall 322 are the two long sides of the display module. This application does not impose any restrictions on this.

[0045] This application illustrates the two short sides of a display module using first sub-wall 321 and second sub-wall 322 as the sides. For smaller display modules, such as an in-vehicle display on a steering wheel, avoiding the short sides of first sub-wall 321 and second sub-wall 322 can reduce the bezel L. One of the second sub-walls 322 can be used as a binding end. Since second sub-wall 322 represents the long side of the display module, this reduces the bezel L while meeting layout requirements. This results in a narrower overall bezel L for the in-vehicle display, creating a more comfortable appearance.

[0046] refer to Figure 3 、 Figure 4 and Figure 6 , Figure 6 To display the module Figure 1 In the cross-sectional view at the middle DD position, the bottom wall 31 includes a first side 311 oppositely arranged along the first direction X and a second side 312 oppositely arranged along the second direction Y. The corner between at least one of the first side 311 and the second side 312 is a rounded corner. The first sub-wall 321 and the second sub-wall 322 are provided with a second notch 323 at the position corresponding to the rounded corner, and the second notch 323 extends to the bottom wall 31 along the height direction.

[0047] In this embodiment, the corner between at least one first side edge 311 and the second side edge 312 is rounded, and a second notch 323 is provided at the rounded corner. The second notch 323 extends in height to the bottom wall 31, that is, the first side wall 32 and the second side wall 41 are completely removed at the rounded corner. The second notch 323 not only avoids the optical film 6, but also avoids the light guide plate 5, thereby increasing the size of the optical film 6 and the light guide plate 5 along the first direction X, ensuring sufficient film pressing amount L1, and preventing the formation of bright edges at the edges of the film and the light guide plate 5 from being seen from a wide angle. Because the first side wall 32 and the second side wall 41 are both removed at the positions corresponding to the optical film 6 and the light guide plate 5, a more demanding narrow frame L design can be met, and the light guide plate 5 and the optical film 6 have room for expansion along the first direction X. This also allows the frame L at the rounded corner to be made narrower than the frame L of the first sub-wall 321 and the second sub-wall 322.

[0048] The second notch 323 may be provided at a corner between one of the first side edges 311 and the second side edges 312 ; or may be provided at the corners of two first side edges 311 and the second side edges 312 , respectively, to make the display module more symmetrical and enhance the aesthetic appearance.

[0049] It can be understood that since the frame L at the rounded corner position is narrower, although the back panel 3 has a second notch 323 at this position for avoidance, the amount of film material L1 is still smaller than the amount of film material L1 at the first notch 3211 position. However, due to the setting of the second notch 323, the amount of film material L1 at this position can be slightly larger than the amount of film material L1 at the position of the first sub-wall 321 where the first notch 3211 is not formed. The amount of film material L1 at this position can also be above 0.9 mm, for example, it can be 0.99 mm.

[0050] In some embodiments of this application, reference Figure 3 、 Figure 4 The first notch 3211 and the second notch 323 are arranged on the same side and are connected.

[0051] When only one first notch 3211 or second notch 323 is provided, the first notch 3211 and the second notch 323 are located on the same side and are connected. Connected means there is no gap between the first notch 3211 and the second notch 323. The first notch 3211 and the second notch 323 are located on the same side and are connected. This allows sufficient expansion space for the optical film 6 along the first direction X and increases the amount of film material L1 without increasing the bezel L, reducing the risk of bright edges on the edges of the optical film 6 and meeting the requirements of an ultra-narrow bezel L for the display module.

[0052] In some embodiments of this application, reference Figure 3 、 Figure 4 The two first sub-walls 321 each include a first notch 3211; the corners between the two first side edges 311 and the second side edges 312 are both rounded, and the first sub-walls 321 and the second sub-walls 322 are both provided with second notches 323 at positions corresponding to the rounded corners; the first notch 3211 and the second notch 323 are connected.

[0053] In this embodiment, two first notches 3211 and two second notches 323 are provided, and the first notches 3211 and the second notches 323 are connected. The back panel 3 can reserve expansion space for the optical film 6 on both sides along the first direction X. Furthermore, the amount of film pressed L1 can be ensured on both sides along the first direction X, reducing the risk of bright edges on the edges of the optical film 6 and meeting the requirements of the ultra-narrow bezel L of the display module.

[0054] refer to Figure 1 、 Figure 3 、 Figure 4 and Figure 7 , Figure 7To display the module Figure 1 In a cross-sectional view taken at position EE, in some embodiments, the corner between the two first side edges 311 and the other second side edge 312 is a right angle; the display module includes a visible area, the visible area includes a first boundary Z21 relatively arranged along the first direction X and a second boundary Z22 relatively arranged along the second direction Y, and the third boundary 3211a of the first notch 3211 close to the right angle side is located outside the second boundary Z22 of the visible area close to the right angle side.

[0055] The first notch 3211 extends all the way to the outside of the second boundary Z22 of the viewing area near the right angle, so that the first side edge 311 and the second side edge 312 at the right angle are away from the viewing area. Therefore, even if the amount of laminated film material L1 is less than 0.9 mm, the bright edge phenomenon is not likely to occur, and the display effect of the display module is not affected. For example, the amount of laminated film material L1 of the first side edge 311 and the second side edge 312 at the right angle can be 0.83 mm. The first side edge 311 and the second side edge 312 do not avoid the optical film material 6 at the right angle, which can also serve to limit the optical film material 6 and prevent the optical film material 6 from moving freely along the first direction X.

[0056] Optionally, refer to Figure 1 The distance L3 between the third boundary 3211a of the first notch 3211 near the right angle and the second boundary Z22 of the viewing area near the right angle is 1 mm to 2 mm, for example, 1 mm, 1.5 mm, 1.9 mm, etc. In this way, the first side edge 311 at the right angle has a better limiting effect on the optical film 6.

[0057] refer to Figure 4 、 Figure 8 and Figure 9 , Figure 8 For Figure 1 A schematic diagram of the structure of adding an iron frame 4 to the outside of the middle back plate 3. Figure 9 For Figure 8 Schematic diagram of the structure of the display module with a light shielding member 7 added to the structure of the display module. The iron frame 4 includes a third notch 43, which is located at a rounded corner and is opposite to the bottom wall 31 in a direction away from the back plate 3. The display module includes a light shielding member 7, which is located outside the second side wall 41 and is used to cover the third notch 43.

[0058] In this embodiment, the number of third notches 43 corresponds to the number of rounded corners, and the number of shading members 7 corresponds to the number of third notches 43. When the back panel 3 has two rounded corners, the iron frame 4 has two third notches 43, and two shading members 7 are also required, with each shading member 7 corresponding to one third notch 43. The third notches 43 are provided at the rounded corner positions of the iron frame 4 to simplify the molding process of the iron frame 4. However, the provision of the third notches 43 does not completely block the back panel 3, and thus local light leakage may occur at positions where the back panel 3 is not covered. By providing the shading member 7 at a position corresponding to the third notch 43 on the outside of the second side wall 41, the shading member 7 is used to cover the first notch 3211, thereby reducing the possibility of light leakage due to the back panel 3 not being completely covered by the iron frame 4.

[0059] Furthermore, the light shielding member 7 is disposed opposite the light guide plate 5 and the third notch 43, thereby better preventing light leakage at the rounded corners. Of course, the light shielding member 7 can also be disposed around the outer side of the iron frame 4, covering not only the third notch 43 at the rounded corners, but also the right-angled positions and the position of the second side wall 41 corresponding to the bottom wall 31 of the back panel 3 and the light guide plate 5, further reducing the possibility of light leakage from the backlight module.

[0060] Alternatively, as Figure 9 As shown, the light shielding member 7 can be light shielding tape or other light-shielding film, such as black tape or black plastic film. The light shielding member 7 is light shielding tape, which can be directly bonded to the outside of the second side wall 41 to prevent light leakage and facilitate use. Furthermore, bonding the light shielding tape to the outside of the second side wall 41 can improve the sealing performance at that location.

[0061] like Figure 10 As shown, Figure 10 This is a structural diagram of the backlight module. In some embodiments of the present application, the display module includes a light absorbing member 8, which is arranged on the inner side of the second side wall 41 and is arranged opposite to the first notch 3211 and the second notch 323 in a direction away from the optical film material 6.

[0062] In this embodiment, the number of light absorbing members 8 is determined by the number of first notches 3211 and second notches 323. When both first notches 3211 and second notches 323 are provided, since the first notches 3211 and second notches 323 are connected, only one larger light absorbing member 8 is required to simultaneously cover the portion of the iron frame 4 opposite the first notches 3211 and second notches 323. When there is one first notch 3211 and two second notches 323, or when there are two second notches 323, two light absorbing members 8 of different sizes are required: the larger light absorbing member 8 is used to cover the portion of the iron frame 4 opposite the first notch 3211 and second notches 323, and the smaller light absorbing member 8 is used to cover the portion of the iron frame 4 opposite the second notch 323. When there are two first notches 3211 and one second notch 323, two light absorbing members 8 of different sizes are also required: the larger light absorbing member 8 is used to cover the portion of the iron frame 4 opposite the first notch 3211 and second notches 323, and the smaller light absorbing member 8 is used to cover the portion of the iron frame 4 opposite the first notch 3211 and second notches 323. When there are two first notches 3211 and two second notches 323 , two light absorbing members 8 of the same size are required, which are respectively attached to the portions of the iron frame 4 opposite to the first notch 3211 and the second notch 323 .

[0063] The light absorbing member 8 is used to cover the portion of the iron frame 4 that is opposite to the first notch 3211 and the second notch 323. In this way, even if light passes through the first notch 3211 and the second notch 323 and shines on the iron frame 4, since this position is covered by the light absorbing member 8, no reflection will occur, and therefore the display module will not have problems such as poor bright lines.

[0064] Optionally, the light absorbing member 8 can be a light absorbing tape or other light absorbing film, such as black tape or black plastic film, etc. The light absorbing member 8 is a light absorbing tape, which can be directly bonded to the inner side of the second side wall 41 to prevent reflection and is convenient to use.

[0065] In some embodiments of this application, reference Figure 5 、 Figure 6 and Figure 11 The optical film material 6 includes a diffuser 61, which is arranged in contact with the light guide plate 5. The edge of the diffuser 61 is coated with a shading material 9, and the coating width of the shading material 9 is 0.5mm-2mm, for example, it can be 0.8mm, 1mm, 1.2mm, 1.5mm, etc.

[0066] A light-shielding material 9 is applied to the edges of the diffuser 61 film. This material absorbs or reflects light, reducing the amount of light that passes through the edges of the diffuser 61 and preventing the display module from experiencing a bright edge defect. This coating of light-shielding material 9 ensures that even if the display module's overall border L is narrow and the edges of the light guide plate 5 are bright, the light-shielding material 9 at the edges of the diffuser 61 blocks the light, ensuring a uniform display across the entire display module. This prevents the display module from experiencing a bright edge defect.

[0067] Regarding the coating width of the light-shielding material 9, if the coating width is too large, for example, greater than 2mm, it will cause compensation transition and sacrifice the effective display area of ​​the display module. If the coating width is insufficient, for example, less than 0.5mm, the effect of controlling the bright edge defect will be weakened, causing bright edge defect. Therefore, the coating width can be controlled between 0.5mm and 2mm.

[0068] The optical film material 6 includes not only a diffuser 61 , but also a prism sheet 62 , a composite brightness enhancement film 63 and other film materials.

[0069] Optionally, the light-shielding material 9 is ink. Ink has excellent light resistance and acid and alkali resistance, does not change color over long-term use, is not easily affected by environmental conditions, and can maintain a good light-shielding effect. Ink also has a certain degree of fluidity, facilitating precise coating via vacuum spraying or inkjet printing.

[0070] Considering that too much grayscale of ink will easily form shadows, and too little grayscale of ink will cause poor bright edges, the grayscale of ink can be controlled between 40% and 65%.

[0071] Furthermore, the grayscale of the ink may be 50%.

[0072] The present application also provides a display device, which includes the display module described above.

[0073] The display device in this embodiment may be, but is not limited to, an in-vehicle display screen, a mobile phone, a tablet, a laptop computer, a television, or the like. The display module, cover plate 1, display panel 2, and backlight module of the display device are sequentially bonded together, which can reduce the frame L of the display module. Furthermore, the back panel 3 only includes a bottom wall 31 and a first side wall 32, and does not include side ribs 42. Side ribs 42 refer to flanges provided on the back panel 3 in the direction of reducing the opening. The position of the light guide plate 5 and the optical film 6 is limited by the ribs 42 of the iron frame 4, which can reduce the gap between the back panel 3 and the light guide plate 5 and the optical film 6, further reducing the size of the frame L, thereby expanding the display area of ​​the display module and enhancing the user experience. The fact that the back panel 3 does not include side ribs 42 also helps reduce the thickness of the display module.

[0074] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the scope of protection of the present application.

Claims

1. A backlight module, characterized in that: The backlight module includes: A back plate comprising a bottom wall and a plurality of first side walls disposed around the bottom wall, the bottom wall and the side walls forming a receiving space with an open top, the first side walls comprising first sub-walls disposed opposite each other along a first direction and second sub-walls disposed opposite each other along a second direction, at least one of the first sub-walls comprising a first notch, the first notch not contacting the bottom wall along a height direction, and the first notch extending along a length direction of the first sub-wall and not contacting the second sub-wall; an iron frame comprising a second side wall and a rib, wherein the second side wall is located outside the first side wall, and the rib is provided at an end of the second side wall away from the bottom wall and extends in a direction of reducing the opening; A light guide plate and an optical film material, wherein the optical film material is further away from the bottom wall of the back plate than the light guide plate, and the retaining edge is used to limit the light guide plate and the optical film material.

2. The backlight module according to claim 1, wherein: The bottom wall includes first side edges arranged opposite to each other along the first direction and second side edges arranged opposite to each other along the second direction, the corner between at least one of the first side edges and one of the second side edges is a rounded corner, and the first sub-wall and the second sub-wall are provided with second notches at positions corresponding to the rounded corners, and the second notches extend along the height direction to the bottom wall.

3. The backlight module according to claim 2, wherein: There is one first notch and one second notch, and the first notch and the second notch are arranged on the same side and are connected.

4. The backlight module according to claim 2, wherein: Both of the two first sub-walls include the first notch; The corners between the two first side edges and one of the second side edges are rounded corners, and the first sub-wall and the second sub-wall are both provided with the second notch at positions corresponding to the rounded corners; The first notch and the second notch are communicated with each other.

5. The backlight module according to claim 4, wherein: A corner between two of the first sides and another of the second sides is a right angle; The display module includes a visual area, which includes a first boundary arranged opposite to each other along a first direction and a second boundary arranged opposite to each other along a second direction. The third boundary of the first notch close to the right angle side is located outside the second boundary of the visual area close to the right angle side.

6. The backlight module according to claim 5, wherein: A distance between a third boundary of the first notch close to the right angle side and the second boundary of the viewing area close to the right angle side is 1 mm-2 mm.

7. The backlight module according to any one of claims 2 to 6, characterized in that: The iron frame includes a third notch, the third notch is provided at the rounded corner position, and is arranged opposite to the bottom wall in a direction away from the back plate; The display module includes a light shielding member, which is arranged on the outer side of the second side wall and is used to cover the third gap.

8. The backlight module according to any one of claims 2 to 6, wherein: The display module includes a light absorbing member, which is disposed on the inner side of the second side wall and is respectively arranged opposite to the first notch and the second notch in a direction away from the optical film material.

9. The backlight module according to any one of claims 2 to 6, wherein: The optical film material includes a diffuser, which is arranged in contact with the light guide plate. The edge of the diffuser is coated with a light-shielding material, and the coating width of the light-shielding material is 0.5 mm to 2 mm.

10. The backlight module according to claim 9, wherein: The light-shielding material is ink, and the grayscale of the ink is 40%-65%.

11. A display module, characterized in that: The display module includes: cover; A display panel bonded to the cover plate; A backlight module, wherein the backlight module is the backlight module according to any one of claims 1 to 10, and the backlight module is bonded to the display panel.

12. A display device, characterized in that: The display device includes the display module according to claim 11.

Images