Backlight module, display module and display device

Abstract

The embodiment of the present disclosure provides a backlight module, a display module and a display device. The backlight module comprises a back plate, the back plate has a bottom plate and a plurality of side plates connected with the bottom plate, and the bottom plate and the side plates cooperate to form an accommodating space; a glue frame connected with the back plate, the glue frame has a plurality of limiting frames corresponding to the side plates one by one, and the edge of the orthographic projection of at least one limiting frame on the bottom plate at least partially coincides with the edge of the bottom plate. Compared with the backlight module in the prior art, the backlight module of the present disclosure reduces the thickness of the side plates of the back plate or the limiting frames of the glue frame, can reduce the size of the module limiting frame, and thus realizes the effect of narrow frame.

Description

Technical Field

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

[0002] With the development of automotive technology, customers now have increasingly higher requirements for narrow bezels in modules, and conventional designs can no longer meet their needs. Summary of the Invention

[0003] This disclosure provides a backlight module, a display module, and a display device to reduce the bezel width of the display device and achieve a narrow bezel design.

[0004] In a first aspect, embodiments of this disclosure provide a backlight module, including:

[0005] A back panel, the back panel having a bottom plate and a plurality of side plates connected to the bottom plate, the bottom plate and the side plates cooperating to form an accommodating space;

[0006] The frame connected to the back panel has a plurality of limiting frames corresponding one-to-one with the side panel, and at least one of the limiting frames has its orthographic projection edge on the base plate at least partially overlapping with the edge of the base plate.

[0007] In the aforementioned backlight module, the bottom plate and side plates in the back panel form an accommodating space. The frame connecting the back panel has a limiting frame, which corresponds one-to-one with the side plates. The orthographic projection edge of the limiting frame on the bottom plate at least partially overlaps with the edge of the bottom plate. Thus, the edge of the bottom plate of the back panel and the outer surface of the limiting frame of the frame are substantially coplanar. The outer surface of the limiting frame refers to the side of the limiting frame away from the accommodating space. In the direction perpendicular to the bottom plate, the outer edge of the bottom plate and the limiting frame are on the same plane. Consequently, the bezel thickness of the backlight module is only the thickness of the side plate, or the bezel thickness of the backlight module is only the thickness of the limiting frame. Compared with the backlight modules in the prior art, the backlight module of this disclosure reduces the thickness of the side plates of the back panel or the limiting frame of the frame, thereby reducing the size of the module's limiting frame and achieving a narrow bezel effect.

[0008] Optionally, the side plate has a protrusion that protrudes in a direction away from the receiving space; the limiting frame has a notch that mates with the protrusion.

[0009] In the direction perpendicular to the base plate, the protrusion contacts the groove wall of the notch and provides support to the limiting frame. The side surface of the limiting frame opposite to the receiving space is coplanar with the side surface of the protrusion opposite to the receiving space.

[0010] Optionally, the side plate is formed with a first snap-fit ​​component, and the limiting frame is formed with a second snap-fit ​​component corresponding to the first snap-fit ​​component, wherein the first snap-fit ​​component and the second snap-fit ​​component snap-fit ​​together.

[0011] Optionally, the first snap-fit ​​component includes a plurality of spaced protrusions that protrude in a direction away from the receiving space, and the second snap-fit ​​component includes a plurality of openings; or, the first snap-fit ​​component includes a plurality of spaced openings, and the second snap-fit ​​component includes a plurality of protrusions that protrude in a direction toward the receiving space.

[0012] The protrusion extends into the opening.

[0013] Optionally, the protrusion is provided between two adjacent protrusions in the plurality of spaced protrusions, and the notch is provided between two adjacent openings in the plurality of spaced openings;

[0014] Alternatively, a notch may be provided between two adjacent protrusions in the plurality of spaced protrusions, and a protrusion may be provided between two adjacent openings in the plurality of spaced openings.

[0015] Optionally, there are multiple notches, and the distance between two adjacent notches ranges from 25mm to 35mm.

[0016] Optionally, at least one opening is provided between two adjacent notches; or, at least one protrusion is provided between two adjacent notches.

[0017] Optionally, the base plate includes a plurality of spaced-apart support portions, which extend outward along the plane of the base plate. Each support portion has a support surface that contacts the limiting frame and is coplanar with the surface of the base plate facing the receiving space.

[0018] Optionally, the side plate is provided with a slot corresponding to the support portion;

[0019] The limiting frame includes a buckle that extends into the slot toward the receiving space and contacts the supporting surface.

[0020] Optionally, it also includes tape;

[0021] The limiting frame and the side plate are connected by the tape, and the side surface of the limiting frame away from the receiving space and the side surface of the side plate away from the receiving space are in contact with the tape.

[0022] Optionally, the tape extends along a direction perpendicular to the base plate and bends to the side of the base plate opposite to the receiving space, and is attached to the side of the base plate opposite to the receiving space.

[0023] Optionally, it further includes: a light guide plate, the light guide plate portion being located within the receiving space, the light guide plate being disposed on the base plate;

[0024] A membrane structure layer located on the side of the light guide plate opposite to the base plate;

[0025] In the direction perpendicular to the base plate, the sum of the thickness of the membrane structure layer and the thickness of the light guide plate is greater than the height of the side plate.

[0026] Optionally, the frame includes a support platform connected to the limiting frame. The support platform is located on the side of the membrane structure layer away from the light guide plate. The side of the support platform away from the membrane structure layer has a support surface, which is parallel to the base plate. The limiting frame has a limiting surface on the side facing the accommodating space, which is perpendicular to the support surface.

[0027] Optionally, along a plane parallel to the plane containing the membrane structure layer, the edge of the membrane structure layer has a gap with the limiting frame.

[0028] Optionally, it also includes foam, which is disposed on the bearing surface, and the orthographic projection of the foam on the bearing surface is located within the bearing surface area.

[0029] Secondly, the present disclosure provides a display module including the backlight module described in any one of the first aspects.

[0030] Optionally, it also includes a display component, which is connected to the support platform via the foam.

[0031] Optionally, the display component includes: a first polarizer, a panel, and a second polarizer stacked together;

[0032] The second polarizer is connected to the support platform through the foam, and the panel is disposed on the side of the second polarizer away from the foam, and the first polarizer is disposed on the side of the panel away from the second polarizer;

[0033] The orthographic projection of the first polarizer onto the panel lies within the plane of the panel.

[0034] The orthographic projection of the second polarizer onto the panel lies within the plane of the panel.

[0035] Optionally, the side surface of the panel facing the first polarizer is coplanar with the upper surface of the limiting frame.

[0036] Thirdly, the present disclosure provides a display device comprising a display module as described in any of the second aspects and a cover plate located on the light-emitting side of the display module. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a partial structural diagram of a display device in the prior art;

[0039] Figure 2 This is a schematic diagram showing the positional structure of the frame and backplate in a backlight module according to an embodiment of the present disclosure;

[0040] Figure 3 A schematic diagram illustrating the positional structure of the frame and backplate in another backlight module provided in this embodiment of the present disclosure;

[0041] Figure 4 An exploded view of the frame and backplate in a backlight module provided in this embodiment of the present disclosure;

[0042] Figure 5 A cross-sectional view of the mating area between a protrusion and an opening in a display device provided in an embodiment of this disclosure;

[0043] Figure 6 A cross-sectional view of the mating area between a protrusion and a notch in a display device provided in an embodiment of this disclosure;

[0044] Figure 7 A cross-sectional view of the latch and slot mating area in another display device provided in this embodiment of the present disclosure;

[0045] Figure 8 This is a schematic diagram of the structure of the buckle and slot mating part in another backlight module provided in an embodiment of this disclosure.

[0046] Figure descriptions: AA - Display area; 1' - Back panel; 2' - Frame; 3' - Film structure layer; 4' - Light guide plate; 5' - Foam; 6' - Display component;

[0047] 1-Back panel; 11-Bottom plate; 111-Support part; 111a-Support surface; 12-Side panel; 121-Protrusion; 122-First snap-fit ​​assembly; 1221-Protrusion; 123-Slot; 2-Frame; 21-Limiting frame; 21a-Limiting surface; 21b-Tape adhesive surface; 211-Notch; 212-Second snap-fit ​​assembly; 2121-Opening; 213-Snap-fit; 22-Supporting platform; 22a-Supporting surface; 3-Membrane structure layer; 4-Light guide plate; 5-Foam; 6-Display assembly; 61-First polarizer; 62-Panel; 63-Second polarizer; 7-Tape; 8-Adhesive layer; 9-Cover plate; 91-Functional layer; 10-Reflector; L-Gap. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this disclosure clearer, the disclosure will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0049] like Figure 1 As shown, Figure 1 This is a partial structural diagram of a display device in the prior art; the bezel of a conventionally designed automotive display device is shown below. Figure 1 As shown, the back panel 1' has its side folded up to support the frame 2'. A light guide plate 4' and a film structure layer 3' are sequentially arranged on the back panel 1'. Foam 5' is placed between the frame 2' and the display component 6'. The frame 2' needs to maintain a certain distance a1 from the AA area, where the AA area refers to the display area AA of the panel; the overlapping part of the frame 2' and the film structure layer 3' is b1; the film structure layer 3' needs to reserve a certain expansion space c1; the thickness of the folded edge of the back panel 1' is e1; the gap between e1 and d1 in the figure is f1; the side thickness of the frame 2' is d1, and the designed gap between the back panel 1' and the frame 2' is f1 (not shown in the figure). Figure 1 The border of the display device in the image is a1+b1+c1+d1+e1+f1.

[0050] a1 is the distance between the frame 2' and area AA, and a1 is generally ≥ 0.6mm;

[0051] b1 is the distance between the frame 2' and the film structure layer 3'. It is necessary to ensure that the film material will not cause optical image defects after reliable expansion and contraction. Generally, the length of the film structure layer 3' is set to be ≥1.3mm for display devices 12.8 inches or smaller and including 12.8 inches; and b1 is ≥1.5mm for display devices 12.8 inches or larger.

[0052] c1 is the distance from the membrane structure layer 3' to the back plate 1'. It is necessary to ensure that the membrane structure layer 3' will not cause optical image defects after reliable expansion and contraction. Generally, the expansion and contraction space needs to be ≥ the total length L of the membrane structure layer 3' * expansion coefficient / 2. The membrane expansion coefficient is usually 0.4%.

[0053] d1 is the thickness of the 2' frame: d1 is generally 0.8mm;

[0054] e1 refers to the thickness of the backplate 1': Common thicknesses for e1 are 0.8mm, 1.0mm, and 1.2mm, with 1.0mm as an example;

[0055] f1 is the gap between the back panel 1' and the frame 2', and f1 is generally 0.1mm;

[0056] For example, taking a 12.8-inch display device as an example, if the length of the 3' film structure layer is 300mm, then the maximum bezel width of the display device = 0.6 + 1.5 + 300 * 0.4% / 2 + 0.8 + 1.0 + 0.1 = 4.6mm.

[0057] In other words, Figure 1 The bezel width of the display device shown in the structure is too large, which does not meet the current trend of narrow bezels in automotive displays. To narrow the bezel of the automotive display device, the following structure is used:

[0058] like Figure 2 and Figure 3 As shown, in a first aspect, the present disclosure provides a backlight module, comprising:

[0059] Back plate 1, back plate 1 has a bottom plate 11 and a plurality of side plates 12 connected to the bottom plate 11, the bottom plate 11 and the side plates 12 cooperate to form an accommodating space;

[0060] The frame 2 connected to the back plate 1 has a plurality of limiting frames 21 corresponding one-to-one with the side plate 12, and the orthographic projection edge of at least one limiting frame 21 on the base plate 11 at least partially coincides with the edge of the base plate 11.

[0061] It should be noted that in the aforementioned backlight module, the bottom plate 11 and side plate 12 in the back panel 1 form an accommodating space. The frame 2 connected to the back panel 1 has a limiting frame 21, which corresponds one-to-one with the side plate 12. The orthogonal projection edge of the limiting frame 21 on the bottom plate 11 at least partially overlaps with the edge of the bottom plate 11. Thus, the edge of the bottom plate 11 of the back panel 1 and the outer surface of the limiting frame 21 of the frame 2 are basically coplanar. The outer surface of the limiting frame 21 refers to the side of the limiting frame 21 that is away from the accommodating space. In the direction perpendicular to the bottom plate 11, the outer edge of the bottom plate 11 and the limiting frame 21 are on the same plane. Therefore, the frame thickness of the backlight module is only the thickness of the side plate 12, or the frame thickness of the backlight module is only the thickness of the limiting frame 21. Compared with the backlight modules in the prior art, the backlight module of this disclosure reduces the thickness of the side plate 12 of the back panel 1 or the limiting frame 21 of the frame 2, which can reduce the size of the module limiting frame 21, thereby achieving the effect of a narrow bezel.

[0062] Understandably, in Figure 2 In the middle, the back plate 1 includes a bottom plate 11 and a side plate 12, and the frame 2 includes a limiting frame 21 and a support platform 22. The side plate 12 corresponds to the limiting frame 21. The limiting frame 21 has a limiting surface 21a facing the receiving space. The support platform 22 has a support surface 22a perpendicular to the limiting surface 21a. The support surface 22a is used to provide support for the display component 6 and other structures, and the limiting surface 21a is used to restrict the display component 6 and other structures. The size of the area enclosed by the limiting surface 21a is the same as the surface of the display component 6. The thickness of the side plate 12 is approximately the same as that of the limiting frame 21. This means that the outer surface of the limiting frame 21 facing away from the receiving space essentially overlaps with the outer surface of the side plate 12 facing away from the receiving space. In other words, the frame thickness of the backlight module is only the thickness of the side plate 12, or only the thickness of the limiting frame 21. Furthermore, the side plate 12 contacts the limiting frame 21, providing Z-direction support for the limiting frame 21. The Z-direction is the vertical direction, effectively preventing the frame 2 from sagging. Compared to existing backlight modules, the backlight module of this disclosure reduces the thickness of the side plate 12 of the back plate 1 or the limiting frame 21 of the frame 2, thereby reducing the size of the module's limiting frame 21 and achieving a narrow bezel effect.

[0063] exist Figure 3In the middle, the back plate 1 includes a bottom plate 11 and a side plate 12, and the frame 2 includes a limiting frame 21 and a support platform 22. The side plate 12 corresponds to the limiting frame 21. The limiting frame 21 has a limiting surface 21a facing the receiving space. The support platform 22 has a support surface 22a perpendicular to the limiting surface 21a. The support surface 22a is used to provide support for the display component 6 and other structures, and the limiting surface 21a is used to restrict the display component 6 and other structures. The size of the area enclosed by the limiting surface 21a is the same as that of the display component 6. The area and size of component 6 are related; the outer surface of the limiting frame 21, which is away from the accommodating space, coincides with the edge of the base plate 11. In the Z direction, the side plate 12 on the outer side of the backlight module and the limiting frame 21 are coplanar, that is, the thickness of the backlight module's frame is only the thickness of the side plate 12, or the thickness of the backlight module's frame is only the thickness of the limiting frame 21; and the base plate 11 contacts the limiting frame 21, providing support for the limiting frame 21 in the Z direction, which is the vertical direction, effectively preventing the frame 2 from sinking. Compared with the backlight modules in the prior art, the backlight module of this disclosure reduces the thickness of the side plate 12 of the back plate 1 or the limiting frame 21 of the frame 2, which can reduce the size of the module limiting frame 21, thereby achieving a narrow bezel effect.

[0064] like Figure 4 As shown, for ease of explanation, the frame 2 and back plate 1 are labeled with top side, ground side, first side and second side. Ground side refers to the side of the display device closest to the driver chip. As an example, a protrusion 121 is formed on the side plate 12 on the top side, and the protrusion 121 protrudes in the direction away from the receiving space; the limiting frame 21 on the top side has a notch 211 that mates with the protrusion 121; for example, a protrusion 121 can be formed on the side plate 12 on the first side, and the protrusion 121 protrudes in the direction away from the receiving space; first The side limiting frame 21 has a notch 211 that mates with the protrusion 121; for example, the protrusion 121 may be formed on the side plate 12 on the second side, and the protrusion 121 protrudes in a direction away from the receiving space; the second side limiting frame 21 has a notch 211 that mates with the protrusion 121; for example, the protrusion 121 may be formed on the side plate 12 on the ground side, and the protrusion 121 protrudes in a direction away from the receiving space; the ground limiting frame 21 has a notch 211 that mates with the protrusion 121.

[0065] To ensure the overall strength of the back plate 1, the back plate 1 is integrally formed, that is, the protrusion 121 of the back plate 1 is integral with the main body of the back plate 1.

[0066] In the Z-direction, along the direction perpendicular to the base plate 11, the protrusion 121 contacts the groove wall of the notch 211 and provides support for the limiting frame 21. Thus, in the Z-direction, the back plate 1 provides both support for the frame 2 and acts as a limit in the Z-direction. The surface of the limiting frame 21 facing away from the receiving space is coplanar with the surface of the protrusion 121 facing away from the receiving space.

[0067] Of course, according to the dimensions of the display device provided in the embodiments of this disclosure, there are multiple notches 211, and the distance between two adjacent notches 211 ranges from 25mm to 35mm. For example, the distance between two adjacent notches 211 can be 25mm, 30mm, or 35mm. Since the distance between two adjacent notches 211 is determined, the number of notches 211 is related to the length of the top side, the ground side, the first side, or the second side. Figure 4 The number of notches 211 is two, which is only for example. Of course, the number of notches 211 can also be one, three or more. The number of protrusions 121 corresponds to the number of notches 211. In order to facilitate the installation of notches 211 and protrusions 121, the dimension of notches 211 in the X direction is greater than or equal to the dimension of protrusions 121 in the X direction.

[0068] The backlight module provided in this embodiment further includes adhesive tape 7; the outer surface of the limiting frame 21 of the frame 2 has an adhesive tape 7 bonding surface 21b, which is mainly located at the notch 211 and the protrusion 121. The limiting frame 21 and the side plate 12 are connected by the adhesive tape 7, and the side surface of the limiting frame 21 away from the receiving space and the side surface of the side plate 12 away from the receiving space are in contact with the adhesive tape 7. The adhesive tape 7 not only has a sealing function, but also makes the frame 2 and the back plate 1 more firmly fixed, and can also play a role in blocking light.

[0069] Continue to refer to Figure 4 The side panel 12 has a first snap-fit ​​component 122, and the limiting frame 21 has a second snap-fit ​​component 212 corresponding to the first snap-fit ​​component 122. The first snap-fit ​​component 122 and the second snap-fit ​​component 212 snap together. Through the cooperation of the first snap-fit ​​component 122 and the second snap-fit ​​component 212, the relative fixation of the frame 2 and the back panel 1 is achieved, and the frame can be limited at least in the X and Y directions. In order to ensure the connection strength between the frame 2 and the back panel 1, the first snap-fit ​​component 122 and the side panel 12 are integral structures, and the second snap-fit ​​component 212 and the limiting frame 21 are integral structures.

[0070] Specifically, the first snap-fit ​​assembly 122 includes a plurality of spaced protrusions 1221, which protrude in a direction away from the receiving space, and the second snap-fit ​​assembly 212 includes a plurality of openings 2121; or, the first snap-fit ​​assembly 122 includes a plurality of spaced openings 2121, and the second snap-fit ​​assembly 212 includes a plurality of protrusions 1221, which protrude in a direction toward the receiving space; the protrusions 1221 extend into the openings 2121. Depending on the dimensions of the back plate 1 and the frame 2, different numbers of protrusions 1221 and openings 2121 that mate with the protrusions 1221 can be selected, thereby increasing the snap-fit ​​points of the frame 2 and the back plate 1, and thus increasing the overall structural strength of the frame 2 and the back plate 1.

[0071] Continue to refer to Figure 4 In the plurality of spaced protrusions 1221, a protrusion 121 is provided between two adjacent protrusions 1221, and a notch 211 is provided between two adjacent openings 2121; of course, in order to increase the stability of the frame 2 and the back plate 1, the number of protrusions 121 provided between two adjacent protrusions 1221 is generally one; similarly, the number of notches 211 provided between two adjacent openings 2121 is generally one.

[0072] Alternatively, a notch 211 may be provided between two adjacent protrusions 1221 in a plurality of spaced protrusions 1221, and a protrusion 121 may be provided between two adjacent openings 2121 in a plurality of spaced openings 2121; of course, in order to increase the stability of the frame 2 and the back plate 1, the number of notches 211 provided between two adjacent protrusions 1221 is generally one; similarly, the number of protrusions 121 between two adjacent openings 2121 is generally one.

[0073] For example, at least one opening 2121 is provided between two adjacent gaps 211; for example, the number of openings 2121 between two adjacent gaps 211 can be 1, 2, 3 or more.

[0074] Alternatively, at least one protrusion 1221 may be provided between two adjacent notches 211; for example, the number of protrusions 1221 between two adjacent notches 211 may be one, two, three or more.

[0075] Since the opening 2121 and the protrusion 1221 are in a mating relationship, the number of openings 2121 and protrusions 1221 must be the same; that is, if there is one opening 2121, there is also one notch 211; if there are two openings 2121, there are also two notches 211; of course, multiple openings are also mating in the same way, which will not be elaborated here.

[0076] Continue to refer to Figure 4 Since the first and second sides are shorter in the Y direction than the top side in the X direction, only an opening 2121 and a protrusion 1221 need to be provided on the first and second sides. Since the ground side needs to be connected to the driver chip, the ground side is also shorter in the X direction than the top side, so only an opening 2121 and a protrusion 1221 need to be provided on the ground side.

[0077] Of course, regarding the specific mating structure of protrusion 1221 and opening 2121, the following will be used as an example. Figure 5 For example, in Figure 5In the middle, the side plate 12 has a protrusion 1221, which extends into the opening 2121 of the limiting frame 21 to achieve a snap-fit, thereby completing the relative fixation of the rubber frame 2 and the back plate 1 in the X and Y directions. For ease of understanding, the following will explain... Figure 5 The specific structure is explained as follows: A reflector 10 is provided on one side of the base plate 11 of the back plate 1. A light guide plate 4 is provided on the side of the reflector 10 away from the base plate 11. LED light strips (not shown in the figure) are placed on the side of the light guide plate 4. A film structure layer 3 is provided on one side of the light-emitting surface of the light guide plate 4. The film structure layer 3 specifically includes a diffusion film, a prism film, and a reflective film arranged sequentially from bottom to top. Specifically, the light emitted by the LED light strip is converted from a line light source to a surface light source through the light guide plate 4, making the light more uniform. The light passes through the diffusion film, which increases the area of ​​light diffusion and makes the light more uniform and soft. After passing through the diffusion film, the light also passes through the prism film. The function of the prism film is to concentrate the dispersed light to a certain angle. Only the light that meets the certain angle will be emitted from the prism film. The light that does not meet the angle will be reflected back to the reflector 10 below by the reflective film, and then emitted from the reflector 10 back to the prism film, so that some of the light that does not meet the angle can be reused.

[0078] Continue to refer to Figure 5 A display component 6 is mounted on the bearing surface 22a of the support platform 22. The display component 6 is arranged in layers from bottom to top, including a second polarizer 63, a panel 62, and a first polarizer 61. Foam 5 is placed between the second polarizer 63 and the bearing surface 22a. The foam 5 serves two purposes: it adheres the frame 2 to the display component 6 and it also provides light shielding. A cover plate 9 is provided on the light-emitting side of the display component 6 to protect it. The cover plate 9 can be a 3D glass cover plate or a 2D glass cover plate. Alternatively, it can be made of other transparent materials besides glass. The cover plate 9 can also be a flexible transparent material, such as plastic (CPI, Colorless PI; PET, polyethylene terephthalate, etc.) or ultra-thin glass (UTG, Ultra Thin Glass), which can be customized according to specific needs. A functional layer 91 is also provided on the side of the cover plate 9 facing away from the display component 6. The functional layer 91 has anti-reflective and anti-light aging properties. The cover plate 9 and the display component 6 are bonded together by an adhesive layer 8, for example, the adhesive layer 8 can be an optically transparent adhesive layer (OCA).

[0079] In the direction perpendicular to the base plate 11, the sum of the thickness of the membrane structure layer 3 and the thickness of the light guide plate 4 is greater than the height of the side plate 12. That is to say, the height of the side plate 12 of the back plate 1 is reduced. Along the plane parallel to the membrane structure layer 3, there is a gap L between the edge of the membrane structure layer 3 and the limiting frame 21, which reserves space for the membrane structure layer 3 to expand. Under the premise of achieving a narrow bezel, it is still ensured that the membrane structure layer 3 will not cause optical image defects after reliable expansion and contraction.

[0080] 'a' represents the distance between frame 2 and area AA, where area AA is the display area AA. Generally, 'a' ≥ 0.6 mm.

[0081] b represents the coverage distance between the frame 2 and the film structure layer 3. It is necessary to ensure that the film material will not cause optical image defects after reliable expansion and contraction. Generally, the length of the film structure layer 3 is set to b1≥1.3mm for display devices 12.8 inches or smaller and including 12.8 inches; and b1≥1.5mm for display devices 12.8 inches or larger.

[0082] c represents the distance L from the membrane structure layer 3 to the backplate 1, which is the expansion space of the membrane structure layer 3. It is necessary to ensure that the membrane structure layer 3 will not cause optical image defects after reliable expansion and contraction. Generally, the expansion and contraction space needs to be ≥ the total length L of the membrane structure layer 3 * expansion coefficient / 2. The membrane expansion coefficient is usually 0.4%.

[0083] d is the thickness of the limiting frame 21 of the glue frame 2, relative to Figure 1 In this regard, e1 and f1 are reduced, and d is generally 0.8mm;

[0084] For example, in a 12.8-inch display device, the length of the film structure layer 3 is 300mm. Figure 5 and Figure 6 The maximum bezel width of the display device is 0.6 + 1.5 + 300 * 0.4% / 2 + 0.8 = 3.5 mm < 4.6 mm.

[0085] Of course, regarding the specific mating structure of the protrusion 121 and the notch 211, the following will be used as an example. Figure 6 For example, in Figure 6 In the middle, the side plate 12 contacts the limiting part, and the notch 211 of the rubber frame 2 is pressed against the protrusion 121 of the back plate 1 to prevent the rubber frame 2 from sinking, thus achieving the limiting of the Z direction.

[0086] To make it easier to understand, the following will be... Figure 6The specific structure is explained as follows: A reflector 10 is provided on one side of the base plate 11 of the back plate 1. A light guide plate 4 is provided on the side of the reflector 10 away from the base plate 11. LED light strips (not shown in the figure) are placed on the side of the light guide plate 4. A film structure layer 3 is provided on one side of the light-emitting surface of the light guide plate 4. The film structure layer 3 specifically includes a diffusion film, a prism film, and a reflective film arranged sequentially from bottom to top. Specifically, the light emitted by the LED light strip is converted from a line light source to a surface light source through the light guide plate 4, making the light more uniform. The light passes through the diffusion film, which increases the area of ​​light diffusion and makes the light more uniform and soft. After passing through the diffusion film, the light also passes through the prism film. The function of the prism film is to concentrate the dispersed light to a certain angle. Only the light that meets the certain angle will be emitted from the prism film. The light that does not meet the angle will be reflected back to the reflector 10 below by the reflective film, and then emitted from the reflector 10 back to the prism film, so that some of the light that does not meet the angle can be reused.

[0087] Continue to refer to Figure 6 A display component 6 is mounted on the bearing surface 22a of the support platform 22. The display component 6 is arranged in layers from bottom to top, including a second polarizer 63, a panel 62, and a first polarizer 61. Foam 5 is placed between the second polarizer 63 and the bearing surface 22a. The foam 5 serves two purposes: it adheres the frame 2 to the display component 6 and it also provides light shielding. A cover plate 9 is provided on the light-emitting side of the display component 6 to protect it. The cover plate 9 can be a 3D glass cover plate or a 2D glass cover plate. Alternatively, it can be made of other transparent materials besides glass. The cover plate 9 can also be a flexible transparent material, such as plastic (CPI, Colorless PI; PET, polyethylene terephthalate, etc.) or ultra-thin glass (UTG, Ultra Thin Glass), which can be customized according to specific needs. A functional layer 91 is also provided on the side of the cover plate 9 facing away from the display component 6. The functional layer 91 has anti-reflective and anti-light aging properties. The cover plate 9 and the display component 6 are bonded together by an adhesive layer 8, for example, the adhesive layer 8 can be an optically transparent adhesive layer (OCA).

[0088] In the direction perpendicular to the base plate 11, the sum of the thickness of the membrane structure layer 3 and the thickness of the light guide plate 4 is greater than the height of the side plate 12. That is to say, the height of the side plate 12 of the back plate 1 is reduced. Along the plane parallel to the membrane structure layer 3, there is a gap L between the edge of the membrane structure layer 3 and the limiting frame 21, which reserves space for the membrane structure layer 3 to expand. Under the premise of achieving a narrow bezel, it is still ensured that the membrane structure layer 3 will not cause optical image defects after reliable expansion and contraction.

[0089] In other specific implementations, such as Figure 7 and Figure 8The base plate 11 includes a plurality of support portions 111 spaced apart. The support portions 111 extend outward along the plane of the base plate 11. The support portions 111 have a support surface 111a. The support surface 111a contacts the limiting frame 21. The support surface 111a is coplanar with the surface of the base plate 11 facing the receiving space.

[0090] The specific structure of the frame 2 is as follows: The frame 2 includes a support platform 22 connected to the limiting frame 21. The support platform 22 is located on the side of the membrane structure layer 3 away from the light guide plate 4. The side of the support platform 22 away from the membrane structure layer 3 has a support surface 22a, which is parallel to the base plate 11. The side of the limiting frame 21 facing the accommodating space has a limiting surface 21a, which is perpendicular to the support surface 22a.

[0091] Specifically, the side plate 12 is provided with a slot 123 corresponding to the support part 111;

[0092] The limiting frame 21 includes a buckle 213, which extends into the slot 123 towards the receiving space and contacts the support surface 111a. The bottom of the back plate 1 is slotted to form the slot 123, and the bottom protrusion forms a support part 111. The support surface 111a of the support part 111 supports the rubber frame 2 and prevents the rubber frame 2 from sinking. At the same time, the limiting frame 21 of the rubber frame 2 includes a buckle 213, which is snapped against the slot 123 to prevent the rubber frame 2 from floating, thereby limiting and fixing the rubber frame 2 and the back plate 1 in the Z direction.

[0093] The backlight module provided in this embodiment of the disclosure also includes tape 7;

[0094] The limiting frame 21 and the side plate 12 are connected by tape 7, and the surface of the limiting frame 21 away from the receiving space and the surface of the side plate 12 away from the receiving space are in contact with the tape 7. The tape 7 not only has a sealing function, but also makes the frame 2 and the back plate 1 more firmly fixed, and also has a light-blocking function. The tape 7 extends along the direction perpendicular to the bottom plate 11 and bends to the side of the bottom plate 11 away from the receiving space, and is attached to the side of the bottom plate 11 away from the receiving space.

[0095] Continue to refer to Figure 7It also includes: a light guide plate 4, part of which is located within the accommodating space and is mounted on the base plate 11; a reflector 10 is disposed between the base plate 11 and the light guide plate 4; and a membrane structure layer 3 is located on the side of the light guide plate 4 facing away from the base plate 11. The membrane structure layer 3 specifically includes, from bottom to top, a diffusion film, a prism film, and a reflective film. Specifically, the LED light strip emits light by converting the line light source into a surface light source through the light guide plate 4, making the light more uniform. The light passes through the diffusion film, which increases the area of ​​light diffusion and makes the light more uniform and soft. After passing through the diffusion film, the light also passes through the prism film, which concentrates the dispersed light to a certain angle. Only light that meets a certain angle will be emitted from the prism film, while light that does not meet the angle will be reflected back to the reflector 10 below by the reflective film, and then emitted from the reflector 10 back to the prism film, allowing some light that does not meet the angle to be reused.

[0096] Continue to refer to Figure 7 Secondly, the display module provided in this embodiment includes a display component 6 disposed on the bearing surface 22a of the support platform 22. The display component 6 is provided with a second polarizer 63, a panel 62 and a first polarizer 61 stacked sequentially from bottom to top. Foam 5 is disposed between the second polarizer 63 and the bearing surface 22a. The foam 5 serves to adhere the frame 2 and the display component 6 and also serves to shield the light. A cover plate 9 is disposed on the light-emitting side of the display component 6 to protect the display component 6. The cover plate 9 can be a 3D glass cover plate 9 or a 2D glass cover plate 9. Of course, the cover plate 9 can also be made of other transparent materials besides glass. The cover plate 9 can also be a flexible transparent material, such as plastic (CPI, Colorless PI; PET, polyethylene terephthalate, etc.) or ultra-thin glass (UTG, Ultra Thin Glass), etc. Those skilled in the art can set it according to actual needs. A functional layer 91 is also provided on the side of the cover plate 9 facing away from the display component 6. The functional layer 91 has the functions of anti-reflection and anti-light aging. The cover plate 9 and the display component 6 are bonded together by an adhesive layer 8. For example, the adhesive layer 8 can be an optically transparent adhesive layer (OCA).

[0097] In the direction perpendicular to the base plate 11, the sum of the thickness of the membrane structure layer 3 and the thickness of the light guide plate 4 is greater than the height of the side plate 12.

[0098] In other words, the height of the side plate 12 of the back plate 1 is reduced, and along the plane parallel to the film structure layer 3, the edge of the film structure layer 3 and the limiting frame 21 have a gap L, leaving space for the film structure layer 3 to expand. Under the premise of achieving a narrow bezel, it is still ensured that the film structure layer 3 will not cause optical image defects after reliable expansion and contraction.

[0099] 'a' represents the distance between frame 2 and area AA, where area AA is the display area AA. Generally, 'a' ≥ 0.6 mm.

[0100] b represents the coverage distance between the frame 2 and the film structure layer 3. It is necessary to ensure that the film material will not cause optical image defects after reliable expansion and contraction. Generally, the length of the film structure layer 3 is set to b1≥1.3mm for display devices 12.8 inches or smaller and including 12.8 inches; and b1≥1.5mm for display devices 12.8 inches or larger.

[0101] c represents the distance L from the membrane structure layer 3 to the backplate 1, which is the expansion space of the membrane structure layer 3. It is necessary to ensure that the membrane structure layer 3 will not cause optical image defects after reliable expansion and contraction. Generally, the expansion and contraction space needs to be ≥ the total length L of the membrane structure layer 3 * expansion coefficient / 2. The membrane expansion coefficient is usually 0.4%.

[0102] d is the thickness of the limiting frame 21 of the glue frame 2, relative to Figure 1 In this regard, e1 and f1 are reduced, and d is generally 0.8mm;

[0103] For example, in a 12.8-inch display device, the length of the film structure layer 3 is 300mm. Figure 7 and Figure 8 The maximum bezel width of the display device is 0.6 + 1.5 + 300 * 0.4% / 2 + 0.8 = 3.5 mm < 4.6 mm.

[0104] Thirdly, embodiments of this disclosure provide a display device including the display module of any one of the second aspects.

[0105] Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this disclosure is also intended to include such modifications and variations.

Claims

1. A backlight module, characterized in that, include: A back panel, the back panel having a bottom plate and a plurality of side plates connected to the bottom plate, the bottom plate and the side plates cooperating to form an accommodating space; The frame connected to the back plate has a plurality of limiting frames corresponding to the side plates, and at least one of the limiting frames has its orthographic projection edge on the bottom plate at least partially overlapping with the edge of the bottom plate. The side plate has a protrusion that protrudes in a direction away from the receiving space; the limiting frame has a notch that mates with the protrusion. In the direction perpendicular to the base plate, the protrusion contacts the groove wall of the notch and provides support to the limiting frame. The side surface of the limiting frame opposite to the receiving space is coplanar with the side surface of the protrusion opposite to the receiving space.

2. The backlight module according to claim 1, characterized in that, The side plate has a first snap-fit ​​component, and the limiting frame has a second snap-fit ​​component corresponding to the first snap-fit ​​component. The first snap-fit ​​component snaps into the second snap-fit ​​component.

3. The backlight module according to claim 2, characterized in that, The first snap-fit ​​component includes a plurality of spaced protrusions that protrude in a direction away from the receiving space, and the second snap-fit ​​component includes a plurality of openings; or, the first snap-fit ​​component includes a plurality of spaced openings, and the second snap-fit ​​component includes a plurality of protrusions that protrude in a direction toward the receiving space. The protrusion extends into the opening.

4. The backlight module according to claim 3, characterized in that, The protrusion is provided between two adjacent protrusions in the plurality of spaced protrusions, and the notch is provided between two adjacent openings in the plurality of spaced openings; Alternatively, a notch may be provided between two adjacent protrusions in the plurality of spaced protrusions, and a protrusion may be provided between two adjacent openings in the plurality of spaced openings.

5. The backlight module according to claim 4, characterized in that, There are multiple notches, and the distance between two adjacent notches ranges from 25mm to 35mm.

6. The backlight module according to claim 5, characterized in that, At least one opening is provided between two adjacent notches; or, at least one protrusion is provided between two adjacent notches.

7. The backlight module according to claim 1, characterized in that, The base plate includes a plurality of support portions spaced apart. The support portions extend outward along the plane of the base plate. Each support portion has a support surface that contacts the limiting frame. The support surface is coplanar with the surface of the base plate facing the receiving space.

8. The backlight module according to claim 7, characterized in that, The side plate is provided with a slot corresponding to the support part; The limiting frame includes a buckle that extends into the slot toward the receiving space and contacts the supporting surface.

9. The backlight module according to any one of claims 1-8, characterized in that, It also includes tape; The limiting frame and the side plate are connected by the tape, and the side surface of the limiting frame away from the receiving space and the side surface of the side plate away from the receiving space are in contact with the tape.

10. The backlight module according to claim 9, characterized in that, The tape extends perpendicular to the base plate and bends to the side of the base plate opposite to the receiving space, and is attached to the side of the base plate opposite to the receiving space.

11. The backlight module according to claim 1, characterized in that, Also includes: A light guide plate, wherein the light guide plate portion is located within the accommodating space, and the light guide plate is disposed on the base plate; A membrane structure layer located on the side of the light guide plate opposite to the base plate; In the direction perpendicular to the base plate, the sum of the thickness of the membrane structure layer and the thickness of the light guide plate is greater than the height of the side plate.

12. The backlight module according to claim 11, characterized in that, The frame includes a support platform connected to the limiting frame. The support platform is located on the side of the membrane structure layer away from the light guide plate. The side of the support platform away from the membrane structure layer has a support surface, which is parallel to the base plate. The limiting frame has a limiting surface on the side facing the accommodating space, which is perpendicular to the support surface.

13. The backlight module according to claim 12, characterized in that, Along the plane parallel to the plane containing the membrane structure layer, there is a gap between the edge of the membrane structure layer and the limiting frame.

14. The backlight module according to claim 12, characterized in that, It also includes foam, which is disposed on the bearing surface, and the orthographic projection of the foam on the bearing surface is located within the bearing surface area.

15. A display module, characterized in that, Includes the backlight module as described in any one of claims 1-14.

16. The display module according to claim 15, characterized in that, It also includes a display component, which is connected to the support platform in the frame via foam in the backlight module.

17. The display module according to claim 16, characterized in that, The display component includes: a first polarizer, a panel, and a second polarizer stacked together; The second polarizer is connected to the support platform through the foam, and the panel is disposed on the side of the second polarizer away from the foam, and the first polarizer is disposed on the side of the panel away from the second polarizer; The orthographic projection of the first polarizer onto the panel lies within the plane of the panel. The orthographic projection of the second polarizer onto the panel lies within the plane of the panel.

18. The display module according to claim 17, characterized in that, The side surface of the panel facing the first polarizer is coplanar with the upper surface of the limiting frame.

19. A display device, characterized in that, Includes the display module as described in any one of claims 15-17 and a cover plate located on the light-emitting side of the display module.

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