Display module and display device

Abstract

A display module and display device include a display panel (2), a backlight assembly (4), a middle frame (3), and a back plate (5). The back plate (5) includes a back plate body (51) located on the side of the backlight assembly (4) away from the display panel (2). The back plate body (51) includes a contact structure recessed from the side away from the light guide assembly toward the light guide assembly, and the contact structure contacts the light guide assembly. A receiving space is formed between the back plate body (51) and the light guide assembly, and on the side of the contact structure near the side-lit backlight (44). An elastic contact member (8) is provided in the receiving space. The elastic contact member (8) contacts the back plate body (51) and is adjacent to the light guide assembly. The middle frame (3) includes a middle frame body (31) surrounding the backlight assembly (4). The middle frame (3) also includes a first limiting protrusion (33) adjacent to the surface of the light guide assembly near the display panel (2). The first limiting protrusion (33) cooperates with the elastic contact member (8) to limit the light guide plate. The display module can improve the alignment of the light guide plate and the side-lit backlight (44), thereby ensuring the display effect.

Description

Technical Field

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

[0002] LCD strip displays are a new type of display medium that has gradually entered people's lives and work recently. As the application of strip displays becomes wider, they are also developing rapidly in the field of intelligent transportation such as buses and subways. In particular, extra-long strip displays can be used in scenarios such as advertising in stations and bus information displays, and they support both landscape and portrait modes, bringing more direct visual convenience to the general public.

[0003] However, for ultra-long displays (especially strip screens, with lengths of 2m or more), it is difficult to ensure that the light guide plate does not warp, which can easily lead to misalignment between the light guide plate and the side-lit backlight, thus affecting the display effect. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a display module and display device that can limit the position of the light guide plate to prevent it from tilting, thereby improving the alignment of the light guide plate and the side-lit backlight, and thus ensuring the display effect.

[0005] To achieve the above objectives, this disclosure provides a display module, including a display panel, a backplate located on the side opposite to the light-emitting surface of the display panel, and a backlight assembly located between the display panel and the backplate. The backlight assembly includes a light guide assembly, comprising an optical film layer, a light guide plate, and a reflective sheet sequentially arranged along a direction away from the display panel. The backlight assembly also includes a side-lit backlight source disposed opposite to the light guide plate. The backplate includes a backplate body located on the side of the backlight assembly opposite to the display panel.

[0006] The backplate body includes a contact structure recessed from the side away from the light guide assembly toward the light guide assembly, the contact structure being in contact with the light guide assembly; a receiving space is formed between the backplate body and the light guide assembly, and on the side of the contact structure closer to the side-lit backlight, an elastic contact member is disposed in the receiving space, the elastic contact member being in contact with the backplate body and being disposed adjacent to the light guide assembly;

[0007] The display module further includes a middle frame, which includes a middle frame body surrounding the backlight assembly; the middle frame also includes a first limiting protrusion adjacent to the surface of the light guide assembly near the display panel, the first limiting protrusion cooperating with the elastic contact member to limit the light guide plate.

[0008] Optionally, the first limiting protrusion is adjacent to the surface of the light guide plate near the side-lit backlight and the side of the light guide plate near the display panel.

[0009] The mid-frame also includes a first extension located between the display panel and the optical film layer, the first extension being used to support the display panel and limit the optical film layer.

[0010] Optionally, the backplate further includes a first backplate side located on the side of the side-lit backlight away from the light guide plate, and a bending portion is provided on the first backplate side, the bending portion extending from the first backplate side to the side of the side-lit backlight away from the backplate body.

[0011] Optionally, the back panel further includes a second back panel side, which is located on at least one side of the display module other than the side-lit backlight distribution side;

[0012] The main body of the middle frame and each of the first back plate side and the second back plate side are provided with a plurality of first recesses on their surfaces in a direction perpendicular to the light-emitting surface. Each of the first back plate side and the second back plate side is provided with a plurality of first protrusions at one end opposite to the main body of the middle frame, and each first protrusion is correspondingly disposed in each of the first recesses.

[0013] Optionally, each of the first recesses corresponding to each of the first protrusions on the side of the first back plate is a blind groove; and each of the first recesses corresponding to each of the first protrusions on the side of the second back plate is a through groove.

[0014] Optionally, the display module further includes a frame, the frame comprising a frame body located on the side of the first recess away from the first protrusion and extending along a plane parallel to the light-emitting surface of the display panel, and a frame side located on the side of each of the first back panel side and the second back panel side away from the backlight assembly; wherein,

[0015] The two opposing surfaces of the frame body and the middle frame body are fitted together.

[0016] The side of the frame is fixedly connected to each of the side of the first back plate and the side of the second back plate by fasteners.

[0017] Optionally, the side-lit backlight includes a printed circuit board and an LED light strip disposed on the printed circuit board;

[0018] The reflector sheet has multiple second protrusions on the side opposite to the printed circuit board, which protrude toward the side-lit backlight. The multiple second protrusions are spaced apart along the side of the reflector sheet opposite to the side-lit backlight, and the end of each second protrusion opposite to the printed circuit board is located below the LED light strip.

[0019] Optionally, the outer surface of each of the second protrusions is covered with an anti-reflective layer.

[0020] Optionally, the reflector is provided with a second recess on the side opposite to the side-lit backlight, and a third protrusion is provided on the side of the backplate opposite to the second recess, the third protrusion being located in the second recess.

[0021] Optionally, the projected outline of the back panel body on the plane where the light-emitting surface of the display panel is located is rectangular;

[0022] The contact structure includes at least three sub-contact structures spaced apart along the long side of the back plate body; the back plate body is also provided with a first reinforcing rib structure recessed from the side away from the light guide component toward the light guide component;

[0023] The first reinforcing rib structure includes two first reinforcing ribs and at least two second reinforcing ribs, wherein the two first reinforcing ribs are respectively disposed on both sides of the at least three sub-contact structures near the two long sides of the back plate body, and are parallel to the long sides of the back plate body;

[0024] A second reinforcing rib is provided in the interval region between each two adjacent sub-contact structures. Each second reinforcing rib is located between two first reinforcing ribs and is parallel to the short side of the back plate body.

[0025] Optionally, at least one of the sub-contact structures is provided with a second reinforcing rib structure, the second reinforcing rib structure including at least one third reinforcing rib and / or at least one fourth reinforcing rib, wherein the third reinforcing rib is parallel to the long side of the back plate body; and the fourth reinforcing rib is parallel to the short side of the back plate body.

[0026] Optionally, there is a gap between each of the first reinforcing ribs and each of the sub-contact structures, and a reinforcing rib plate is provided on the side of the back panel body near the backlight assembly, in the gap between each of the first reinforcing ribs and the sub-contact structures.

[0027] Optionally, the interval between one of the first reinforcing ribs and the sub-contact structure is a first interval, and the interval between the other first reinforcing rib and the sub-contact structure is a second interval, wherein the first interval is smaller than the second interval;

[0028] The reinforcing rib in the first interval has an L-shaped cross-section in the plane perpendicular to the light-emitting surface of the display panel; the reinforcing rib in the second interval has a U-shaped cross-section in the plane perpendicular to the light-emitting surface of the display panel.

[0029] The second interval is closer to the side-lit backlight than the first interval.

[0030] Optionally, the side-lit backlight includes a printed circuit board and an LED light strip disposed on the printed circuit board;

[0031] The projection of the light-incident surface of the light guide plate onto the plane of the printed circuit board is a first strip, and the orthographic projection of the LED light strip onto the plane of the printed circuit board is a second strip.

[0032] Under room temperature conditions, the length of the first strip is greater than the length of the second strip, and the two ends of the first strip are closer to the outer contour lines of the display module on both sides that are opposite to each other in the extension direction of the first strip than the two ends of the second strip.

[0033] Under the minimum storage temperature condition of the display module, the length of the first strip is greater than or equal to the length of the second strip, and neither end of the second strip is closer to the outer contour lines of the display module that are opposite to each other in the extension direction of the first strip than the ends of the first strip.

[0034] Optionally, under room temperature conditions, the length difference D between the first stripe and the second stripe satisfies the following relationship:

[0035] D≥1.1×S 导

[0036] Wherein, S_guide is the total shrinkage amount of the light guide plate from both ends to the middle in the extension direction of the first strip. The total shrinkage amount is equal to the product of the length of the light guide plate, the specified temperature difference, and the coefficient of thermal expansion. The specified temperature difference is the difference between room temperature and the minimum operating temperature of the display module.

[0037] Optionally, the middle frame includes a plurality of segments spliced ​​together in sequence along its circumference, with a gap between each pair of adjacent segments, and the end of the first of each pair of adjacent segments is provided with a first overlapping portion extending toward the second, and the end of the second segment is provided with a second overlapping portion extending toward the first, the second overlapping portion and the first overlapping portion overlapping each other.

[0038] The first overlapping portion has a first seam between its end and the end of the second portion; the second overlapping portion has a second seam between its end and the end of the first portion.

[0039] Optionally, the outer contours of both the display panel and the middle frame are rectangular;

[0040] The segmentation consists of six segments, four of which are straight line segments and the remaining two are broken line segments;

[0041] Two of the straight line segments are located on one side of one of the long sides of the display panel, and the other two straight line segments are located on the other side of the display panel. The two straight line segments on the same side are parallel to the long side and are joined together.

[0042] Each of the two line segments includes a first sub-segment and two second sub-segments, wherein the first sub-segment is located on one side of the short side of the display panel and is parallel to the short side, and the two second sub-segments are located on one side of the two long sides of the display panel and are parallel to the long sides; one end of each of the two second sub-segments is connected to both ends of the first sub-segment, and the other end of each of the two second sub-segments is connected to the adjacent straight line segment.

[0043] Optionally, the total width of the seam in the long side direction of the middle frame satisfies the following relationship to ensure that the middle frame will not bulge at the seam when it expands under high temperature conditions, thus preventing the back panel from being squeezed:

[0044] B 总 >0.9×(G1-G2)

[0045] Wherein, B_total is the total width of the seam along the long side of the middle frame, which is equal to the sum of the width of the first seam between two straight segments along the long side of the middle frame and the width of the first seam between each second sub-segment and the adjacent straight segment; G1 is the amount of thermal expansion of the middle frame along its long side from room temperature to the maximum operating temperature of the display module; G2 is the amount of thermal expansion of the back panel along its long side from room temperature to the maximum operating temperature of the display module.

[0046] Optionally, the minimum overlap between each of the first overlapping portions and the corresponding second overlapping portions of the middle frame in the direction of their long side satisfies the following relationship to ensure that no light leaks at the joints when the middle frame shrinks under low temperature conditions:

[0047] Cmin>1.1×S 中

[0048] Wherein, Cmin is the minimum overlap amount, which is the minimum of the overlap amounts corresponding to the two straight line segments along the long side of the middle frame and the overlap amounts corresponding to the second sub-segment and the adjacent straight line segment; S is the shrinkage amount of the middle frame along its long side as it decreases from room temperature to the minimum operating temperature of the display module.

[0049] Optionally, the middle frame body includes a middle frame side located on the side opposite to the light guide assembly of each of the first back plate side and the second back plate side; at least one of the middle frame sides is provided with a plurality of third recesses, and the back plate side corresponding to the middle frame side with the third recess is provided with a plurality of fourth recesses, and the optical film layer is provided with a plurality of fourth protrusions on the side corresponding to the middle frame side with the third recess.

[0050] Optionally, the third recess is a through groove; the display module includes a light-shielding member located on the side of the middle frame away from the optical film layer; the orthographic projection of the light-shielding member on the side of the middle frame covers the third recess.

[0051] Optionally, the diagonal size of the display area of ​​the display panel is greater than or equal to 48 inches; the aspect ratio of the display area of ​​the display panel is greater than or equal to 16:5.

[0052] As another technical solution, this disclosure also provides a display device, including the display module provided in the above-mentioned embodiments of this disclosure, wherein the display module is a bar display module. Attached Figure Description

[0053] Figure 1 This is an exploded view of the structure of the display module provided in the embodiments of this disclosure;

[0054] Figure 2 This is a schematic diagram of the structure of the back plate and the back plate body on the opposite side of the embodiment of this disclosure;

[0055] Figure 3 This is a structural diagram of the back plate and the back plate body on opposite sides of a specific embodiment of the present invention;

[0056] Figure 4A This is a partial structural diagram of a compensating stiffener used in an embodiment of this disclosure;

[0057] Figure 4B This is a partial structural diagram of another compensating stiffener used in an embodiment of this disclosure;

[0058] Figure 5 A top view of the display module provided in an embodiment of this disclosure;

[0059] Figure 6 For along Figure 5 Sectional view of line II in the middle;

[0060] Figure 7 For along Figure 5 Sectional view of line II-II in the middle;

[0061] Figure 8A This is a partial structural diagram of the backplate used in an embodiment of the present disclosure at the side of the first backplate;

[0062] Figure 8B This is a schematic diagram of the projection of the light guide plate and some LEDs used in the embodiments of this disclosure onto a plane parallel to the light-emitting surface;

[0063] Figure 9 This is a segmented layout diagram of the mid-frame used in an embodiment of this disclosure;

[0064] Figure 10A This is a partial structural diagram of the splicing point of two adjacent straight line segments used in an embodiment of this disclosure;

[0065] Figure 10B This is a partial structural diagram of the junction between the second sub-segment and the adjacent straight line segment used in an embodiment of this disclosure;

[0066] Figure 11A This is a partial structural diagram of the side of the middle frame at the second recess in an embodiment of this disclosure;

[0067] Figure 11B This is a partial structural diagram of the middle frame used in the embodiments of this disclosure at the first and second recesses;

[0068] Figure 12A For along Figure 5 Sectional view of line III-III in the middle;

[0069] Figure 12B for Figure 12A A partial top view showing the positional relationship between the middle optical film layer and the side of the second back plate;

[0070] Figure 13 This is a partial structural diagram of the optical film layer used in the embodiments of this disclosure;

[0071] Figure 14A This is a structural diagram of the reflective sheet used in the embodiments of this disclosure;

[0072] Figure 14B for Figure 14A A magnified view of region I in the middle. Detailed Implementation

[0073] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0074] The shapes and sizes of the components in the accompanying drawings do not reflect actual proportions and are intended only to facilitate understanding of the contents of the embodiments disclosed herein.

[0075] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0076] This disclosure is not limited to the embodiments shown in the accompanying drawings, but includes modifications to the configuration based on the manufacturing process. Therefore, the areas illustrated in the drawings are schematic, and the shapes of the areas shown illustrate specific shapes of the areas of an element, but are not intended to be limiting.

[0077] Please see Figure 1The display module provided in this embodiment includes a display panel 2, a mid-frame 3, a backplate 5 located on the side opposite to the light-emitting surface of the display panel 2, and a backlight assembly located between the display panel 2 and the backplate 5. Optionally, the display module also includes a bezel 1 and a circuit board assembly 6 (including a constant current plate and its protective cover, a timing controller and its protective cover). The backlight assembly 4 includes a light guide assembly, which includes, but is not limited to, an optical film layer 41, a light guide plate 42, and a reflective sheet 43 arranged sequentially in a direction away from the display panel 2. Additionally, the backlight assembly 4 may also include a side-lit backlight 44 disposed opposite to the light guide plate 42. Here, "opposite arrangement" refers to the side-lit backlight 44 being disposed opposite to the light-incident surface of the light guide plate 42, which is perpendicular to the light-emitting surface of the display panel. In practical applications, the optical film layer 41 can, for example, serve to uniformly distribute light. The optical film layer 41 may include, for example, a multilayer optical film material such as a lower diffusion film and a prism film, wherein the lower diffusion film is used to diffuse light; the prism film is used to improve the brightness of light; optionally, an upper diffusion film or other functional film materials may also be added.

[0078] Please see Figure 2 The backplate 5 includes a backplate body 51 located on the side of the backlight assembly 4 facing away from the display panel 2. The backplate body 51 has a contact structure recessed from the side facing away from the backlight assembly 4 towards the backlight assembly 4 (i.e., from the outside in). This contact structure contacts the light guide assembly and provides support. In some optional embodiments, the projected outline of the backplate body 51 on the plane containing the light-emitting surface of the display panel 2 is rectangular. This rectangle may include a rounded rectangle, meaning that at least one of the four corners of the rectangle is rounded. At least three sub-contact structures are spaced apart along the direction parallel to the long side of the backplate body 51 (i.e., the X direction), for example... Figure 3 Three sub-contact structures (52a, 52b, 52c) are shown, each contacting the backlight assembly 4 and providing support. Specifically, at least two adjacent sub-contact structures are separated by a gap region. Either two adjacent sub-contact structures can be completely separated by this gap region, or they can be designed to be interconnected on at least one side of the gap region. It should be noted that the number and layout of the sub-contact structures can be freely set according to specific needs, and this embodiment does not impose any particular limitations in this regard.

[0079] Specifically, the light-emitting surface of the display panel has a rectangular or approximately rectangular outline; the orthographic projection of the outer outline of the display module onto the plane containing the light-emitting surface of the display panel can be rectangular or approximately rectangular; the orthographic projections of the outer outline of the mid-frame, the outer outline of the light guide plate, and the outer outline of the optical film layer onto the plane containing the light-emitting surface of the display panel can all be rectangular or approximately rectangular. The rectangle may also include a rounded rectangle, meaning that at least one of the four corners of the rectangle is rounded.

[0080] To ensure heat dissipation, the backplate body 51 can be made of a material with good heat dissipation efficiency, such as aluminum or aluminum alloy. To enhance the strength of the backplate body 51, it also has a first reinforcing rib structure recessed from the side away from the light guide assembly towards the light guide assembly (i.e., from the outside to the inside). This first reinforcing rib structure can, for example, be stamped from the outside to the inside, with a stamping depth of, for example, 6 mm. Specifically, the first reinforcing rib structure includes two first reinforcing ribs (53a, 53b) and at least two second reinforcing ribs, for example... Figure 2 Two second reinforcing ribs (54a, 54b) are shown, wherein two first reinforcing ribs (53a, 53b) are respectively disposed on both sides of the at least three sub-contact structures near the two long sides of the back panel body 51, that is, disposed opposite each other on both sides of the at least three sub-contact structures in the Y direction, and both first reinforcing ribs (53a, 53b) are parallel to the long sides of the back panel body 51. In this way, the two first reinforcing ribs (53a, 53b) can strengthen the back panel body 51 in the direction parallel to the long side (i.e., the X direction), thereby preventing the display module from bending deformation when subjected to two points of force in the long side direction. It should be noted that the above-mentioned first reinforcing ribs should have sufficient length, for example, extending both ends of each first reinforcing rib to the positions near the two short sides of the back panel body 51, so as to ensure that the strength of the back panel body 51 in its length direction is improved, thereby ensuring that the display module does not bend deformation when subjected to two points of force in the long side direction. Specifically, each first reinforcing rib can be a continuously extending structure, that is, extending from one side of the back plate to the other side along a direction parallel to the long side; specifically, each first reinforcing rib can be a segmented extending structure, for example, the first reinforcing rib includes multiple first sub-reinforcing ribs, the multiple first sub-reinforcing ribs are arranged from one side of the back plate to the other side along a direction parallel to the long side, and all the first sub-reinforcing ribs extend in the same direction, with intervals between adjacent first sub-reinforcing ribs, the multiple first sub-reinforcing ribs can be arranged on the same straight line or the multiple first sub-reinforcing ribs can be arranged on at least two straight lines. Preferably, each first reinforcing rib is a continuously extending structure. Preferably, the first reinforcing rib includes a plurality of first sub-reinforcing ribs, which are arranged from one side of the back plate to the other side along a direction parallel to the long side, and all the first sub-reinforcing ribs extend in the same direction. There is a gap between adjacent first sub-reinforcing ribs. The plurality of first sub-reinforcing ribs are arranged on at least two straight lines. For a first sub-reinforcing rib arranged on a straight line, the gap between two adjacent first sub-reinforcing ribs is filled by first sub-reinforcing ribs arranged along other straight lines in a direction parallel to the short side (i.e., the Y direction). The above two preferred solutions can better avoid bending deformation of the display module when it is subjected to two points of force in the long side direction.

[0081] In practical applications, the size and position of the two first reinforcing ribs (53a, 53b) can be designed according to the specific spatial layout on the backplate body 51. For example, considering the difference in space size on both sides of the contact area on the backplate body 51, this is because circuit boards, ribbon cables, and other components are correspondingly arranged on one side of the contact area on the backplate body 51. In order to avoid the mounting holes or other mounting structures of these components, such as the ribbon cable hole 57 for the ribbon cable to pass through, the area of ​​the backplate body 51 near the ribbon cable hole 57 in the contact area is narrower than the other side. Therefore, the widths of the two first reinforcing ribs (53a, 53b) are also different. Taking a display module applied to a strip screen as an example, the outer contour length of the display module is, for example, 2171.08mm, the width is 359.5mm, and the thickness is 9.29mm (body thickness), 24.79mm (the sum of the body thickness and the thickness of the timing controller and its protective cover), and 26.29mm (the sum of the body thickness and the thickness of the constant current plate and its protective cover). In this case, the two first reinforcing ribs (53a, 53b) have the same length, for example, 2091mm; the width of the first reinforcing rib 53a closer to the cable hole 57 is 36.7mm, and the width of the first reinforcing rib 53b farther from the cable hole 57 is 24.1mm.

[0082] like Figure 2 As shown, a second reinforcing rib is provided in the interval area between each pair of adjacent sub-contact structures. Each second reinforcing rib is located between two first reinforcing ribs (53a, 53b) and is parallel to the short side of the back panel body 51, i.e., parallel to the Y direction. With at least two second reinforcing ribs, the two short sides of the back panel body 51 can be strengthened. With at least two second reinforcing ribs parallel to the short sides of the back panel body 51, diagonal twisting deformation of the display module can be avoided. The above-mentioned first reinforcing rib structure significantly improves the strength of the back panel when applied to ultra-long displays (especially strip screens), thereby ensuring display quality.

[0083] In some optional embodiments, the surface of the first reinforcing rib structure on the side of the back panel body 51 opposite to the backlight assembly 4 is flush with each sub-contact structure, so that the first reinforcing rib structure can contact the backlight assembly 4 and thus work together with each sub-contact structure to provide support.

[0084] In some alternative embodiments, to avoid holes, screws, or other parts on the backplate body 51, at least one of the two first reinforcing ribs (53a, 53b) is provided with a notch or is partially bent, for example, as Figure 3As shown, the first reinforcing rib 53a near the cable hole 57 has multiple notches 531. It can be understood that when the first reinforcing rib has notches or is partially bent, the overall shape of the first reinforcing rib can be considered to be parallel to the long side of the back plate body 51.

[0085] In some alternative embodiments, such as Figure 3 As shown, three sub-contact structures (52a, 52b, 52c) can be defined based on the positions of the four rivet posts 56. Specifically, the three are located on the left, inside, and right sides of the overall installation area A3 defined by the four rivet posts 56, respectively. The rivet posts 56 are used for user installation of the entire unit. Optionally, taking a display module applied to a strip screen as an example, the middle sub-contact structure 52b is, for example, a rectangle with a length × width of, for example, 600mm × 200mm. Furthermore, the constant current plate and its protective cover are installed on the side of the backplate body 51 away from the backlight assembly 4 and located in area A1, which is located within the left sub-contact structure 52a; the timing controller and its protective cover are installed on the side of the backplate body 51 away from the backlight assembly 4 and located in area A2, which is located within the middle sub-contact structure 52b. Based on this, in order to avoid the rivet 56, each of the two second reinforcing ribs (54a, 54b) is located in the gap between the two rivet 56 that are arranged opposite each other in the Y direction. Taking the display module applied to the bar screen as an example, the length × width of the second reinforcing rib is, for example, 154mm × 30.2mm.

[0086] In some optional embodiments, in order to further enhance the local area strength of the back panel 5, a second reinforcing rib structure is provided on the surface of the back panel body 51 opposite to the backlight assembly 4 and in at least one sub-contact structure. The second reinforcing rib structure includes at least one third reinforcing rib and / or at least one fourth reinforcing rib, wherein the third reinforcing rib is parallel to the long side of the back panel body 51 (i.e., parallel to the X direction); and the fourth reinforcing rib is parallel to the short side of the back panel body 51 (i.e., parallel to the Y direction).

[0087] In practical applications, the design of the aforementioned second reinforcing rib structure can be determined based on the position of each component in the circuit board assembly 6, as well as the shape and size of the blank area. For example, Figure 3 As shown, the constant current plate is located in the contact area 52a on the left side. Under the premise of avoiding the A1 area, the blank area on the left side of the A1 area is relatively large, and six fourth reinforcing ribs 55b' can be arranged. However, the embodiments of this disclosure are not limited to this. A specified number of third reinforcing ribs 55a' can also be arranged, or a specified number of third reinforcing ribs 55a' and a specified number of fourth reinforcing ribs 55b' can also be arranged. The blank area on the upper side of the A1 area is relatively small and narrow in the Y direction, so one third reinforcing rib 55a' can be arranged.

[0088] In some alternative embodiments, in the left-side contact area 52a, at least one of a third reinforcing rib 55a' and six fourth reinforcing ribs 55b' is a groove formed on the surface of the sub-contact structure 52a and the side near the display panel 2. This groove can be formed by etching. This processing method can be used as a compromise after the backplate 5 is manufactured, allowing for a second processing of the backplate 5 to design the second reinforcing rib more flexibly. In addition, the groove formed on the surface of the sub-contact structure 52a in contact with the backplate assembly ensures both the aesthetics of the outer surface of the backplate and avoids an uneven outer surface that could scratch hands.

[0089] In some optional embodiments, the six fourth reinforcing ribs 55b' have the same length, width, and depth. Taking a display module applied to a strip screen as an example, the length is, for example, 146 mm, the width is, for example, 3 mm, and the depth is, for example, 0.2 mm. The spacing between two adjacent fourth reinforcing ribs 55b' is, for example, 75 mm. The third reinforcing rib 55a has, for example, a length of 200 mm, a width of, for example, 3 mm, and a depth of, for example, 0.2 mm.

[0090] The intermediate sub-contact structure 52b has the A2 area where the timing controller is located. While avoiding the A2 area, a fourth reinforcing rib 55b is provided. This rib is recessed, for example, from the side opposite to the backlight assembly 4 in a direction away from the backlight assembly 4. That is, the recessed direction of the fourth reinforcing rib 55b is opposite to the recessed directions of the first and second reinforcing ribs, ensuring that the first and second reinforcing ribs can contact the backlight assembly 4 without creating a secondary step. Taking a display module applied to a strip screen as an example, the length of the fourth reinforcing rib 55b in the intermediate sub-contact structure 52b is, for example, 155mm, and the width is, for example, 25mm. The fourth reinforcing rib 55b in the intermediate sub-contact structure 52b can, for example, be stamped from the inside out, with a stamping depth of, for example, 2mm. The right-side sub-contact structure 52c has five fourth reinforcing ribs 55b, which are recessed from the side opposite to the backlight assembly 4 in a direction away from the backlight assembly 4. That is, the recessed direction of the fourth reinforcing ribs 55b is opposite to the recessed direction of the first and second reinforcing ribs, so as to ensure that the first and second reinforcing ribs can contact the backlight assembly 4 without creating a secondary step. The five fourth reinforcing ribs 55b in the sub-contact structure 52c have the same length, width, and depth. Taking a display module applied to a strip screen as an example, the length is, for example, 155mm, the width is, for example, 25mm, the stamping depth is, for example, 2mm, and the spacing between two adjacent fourth reinforcing ribs 55b is, for example, 150mm.

[0091] It should be noted that, in practical applications, for sub-contact structures without components in the circuit board assembly 6, the number, layout, and manufacturing method of the third and / or fourth reinforcing ribs in the second reinforcing rib structure can be designed according to specific needs. For sub-contact structures with components in the circuit board assembly 6, the design can be carried out based on the position of each component in the circuit board assembly 6 and the shape and size of the blank area, provided that the component is avoided. This disclosure embodiment does not impose any particular restrictions on this.

[0092] The display module provided in this embodiment can improve the strength of the back panel in local areas by means of the aforementioned second reinforcing rib structure, thereby preventing bending and / or twisting deformation of ultra-long displays (especially strip screens) in local areas and further ensuring the display effect. In addition, by using a combination of the first and second reinforcing rib structures, the strength of the back panel can be improved from both overall and local aspects, thereby effectively preventing the display from deforming.

[0093] In some alternative embodiments, to further improve the strength of the backplate, such as Figure 3 As shown, each of the two first reinforcing ribs (53a, 53b) has a gap between it and each sub-contact structure. For example, the gap between the first reinforcing rib 53a near the ribbon cable hole 57 and each sub-contact structure is the first gap, and the gap between the first reinforcing rib 53b away from the ribbon cable hole 57 and each sub-contact structure is the second gap. Moreover, in order to avoid the circuit boards, ribbon cables and other components provided on the back plate 5, the back plate 5 is narrower in the area near the ribbon cable hole 57, so the first gap is smaller than the second gap. For example, taking a display module applied to a strip screen as an example, the first gap is 10.2mm and the second gap is 23mm. Furthermore, a reinforcing rib plate 7a is provided on the side of the back plate body 51 near the backlight assembly 4 and located in the first gap; a reinforcing rib plate 7b is provided on the side of the back plate body 51 near the backlight assembly 4 and located in the second gap.

[0094] In some alternative embodiments, the reinforcing ribs 7a and 7b are, for example, electrolytically galvanized steel sheets (EGI).

[0095] In some alternative embodiments, such as Figure 3 As shown, there are two reinforcing ribs 7a located in the first interval, and there is a gap between the two reinforcing ribs 7a to reserve clearance space for the cable hole 57.

[0096] In some optional embodiments, the cross-sectional shape and size of the reinforcing rib can be designed according to the first and second intervals described above to ensure sufficient space on the reinforcing rib for mounting screws. Optionally, the cross-sectional shape of the reinforcing rib perpendicular to the light-emitting surface of the display panel 2 includes an L-shape or a U-shape, etc. Specifically, as shown... Figure 4A As shown, the two reinforcing ribs 7a located in the first interval have an L-shaped cross-section in the plane perpendicular to the light-emitting surface of the display panel 2. This is because the first interval is relatively small, and under the same width, the screw mounting space on the L-shaped reinforcing rib is larger than that on the U-shaped reinforcing rib, thus ensuring sufficient space on the reinforcing rib 7a to mount the screws 71. Optionally, taking a display module applied to a strip screen as an example, the length of each reinforcing rib 7a near the ribbon cable hole 57 is, for example, 920 mm, the width is, for example, 10.5 mm, and the thickness is, for example, 1.5 mm. Each reinforcing rib 7a located in the first interval is, for example, fixedly connected to the back panel body 51 by 7 screws 71. Since the second interval is relatively large, as Figure 4B As shown, the reinforcing rib 7b located in the second interval has a U-shaped cross-section in the plane perpendicular to the light-emitting surface of the display panel 2, and the U-shaped reinforcing rib 7b has a better reinforcement effect. Optionally, taking a display module applied to a strip screen as an example, the length of the reinforcing rib 7b located in the second interval is, for example, 2020mm, the width is, for example, 18mm, and the thickness is, for example, 1.5mm. The reinforcing rib 7b located in the second interval is, for example, fixedly connected to the back plate body 51 by 14 screws 71.

[0097] In some alternative embodiments, Figure 5 The image shows the backlight module in a horizontal orientation. Optionally, the DPO side is the ground side; the DP side is the sky side; and the GP side and GPO side are the left and right sides, respectively. When the display module is in a horizontal orientation, that is, the long side of the display module is parallel to the placement surface of the display module, the ground side (DPO side) refers to the side of the display module facing the placement surface when placed on the placement surface; the sky side (DP side) refers to the side of the display module facing away from the placement surface when placed on the placement surface. Preferably, the side-lit backlight 44 is located on the DPO side. By placing the side-lit backlight 44 on the ground side of the display module, the light guide plate maintains a stable distance from the side-lit backlight 44 under the action of gravity, thereby ensuring the display effect.

[0098] like Figure 5 and Figure 6 As shown, the backplate 5 also includes a first backplate side 58a located on the side of the side-lit backlight 44 facing away from the light guide plate 42, as... Figure 7As shown, optionally, the backplate 5 also includes a second backplate side 58b, which is located on at least one side of the display module other than the side where the side-lit backlight 44 is distributed. That is, the first backplate side 58a is located on the side where the side-lit backlight 44 is distributed on the light guide plate 42, while the second backplate side 58b is located on the side where the side-lit backlight 44 is distributed on the light guide plate 42. Furthermore, as... Figure 6 and Figure 8A As shown, a bent portion 581 is provided on the first back panel side 58a. This bent portion 581 bends from the first back panel side 58a toward the side-lit backlight 44, towards the side opposite to the display panel 2, and partially overlaps with the side-lit backlight 44. For example, the side-lit backlight 44 is located on the long side of the display module. For example, the number of second back panel sides 58b is three, that is, the side-lit backlight 44 is distributed only on one side of the light guide plate 42; or, the side-lit backlight 44 can be distributed on opposite sides of the light guide plate 42, in which case the number of first back panel sides 58a and second back panel sides 58b are two each. For example, the number of bent portions 581 provided on each first back panel side 58a can be multiple.

[0099] The bending portion 581 serves to limit the position of the side-lit backlight 44 in the Z direction. Furthermore, by arranging multiple bending portions 581 at intervals along the extension direction of the first back panel side 58a, it can be ensured that the side-lit backlight 44 is aligned with the light guide plate 42 at all positions along the extension direction of the first back panel side 58a, thus preventing light leakage. For ultra-long displays (e.g., over 2m), especially strip screens, misalignment between the side-lit backlight 44 and the light guide plate 42 can easily occur, leading to light leakage. The above design effectively solves this misalignment problem.

[0100] In some alternative embodiments, such as Figure 5 As shown, the side-lit backlight 44 includes a printed circuit board 441 and an LED strip 442 disposed on the printed circuit board 441, the LED strip 442 being disposed opposite to the light-incident surface of the light guide plate 42. Furthermore, the printed circuit board 441 is bonded to the surface of the first backplate side 58a opposite to the printed circuit board 441. Additionally, the bent portion 581 may have a gap in the Z direction with the printed circuit board 441 to ensure smooth installation of the side-lit backlight 44.

[0101] In some alternative embodiments, such as Figure 8AAs shown, there are multiple side-lit backlights 44 located on the same side of the light guide plate 42, and they are arranged sequentially in the extending direction (i.e., the X direction) of the side edge 58a of the first back plate. Each pair of adjacent side-lit backlights 44 is electrically connected by a lamp strip connector 45. In this case, at least one bend 581 is provided corresponding to each side-lit backlight 44. For example, there are four side-lit backlights 44, and each side-lit backlight 44 is provided with four bends 581, for a total of sixteen bends 581.

[0102] In some alternative embodiments, such as Figure 5 and Figure 6 As shown, a receiving space is formed between the backplate body 51 and the light guide assembly, and on the side of the contact structure near the side-lit backlight 44. An elastic contact member 8 is disposed in this receiving space. The elastic contact member 8 is in contact with the backplate body 51 and is disposed adjacent to the light guide assembly (i.e., no other components are disposed between the elastic contact member 8 and the light guide assembly; for example, they may or may not be in contact; when they are not in contact, air may be present between them). This elastic contact member provides elastic support to further prevent the light guide plate 42 from warping. In some optional embodiments, the elastic contact member 8 may be made of rubber, for example. Optionally, the elastic contact member 8 and at least three sub-contact structures are flush with the contact surface of the backlight assembly 4.

[0103] In some alternative embodiments, the resilient contact 8 may also be disposed adjacent to the backplate body 51 and in contact with the light guide assembly.

[0104] The display module also includes a mid-frame 3, which includes a mid-frame body 31 surrounding the backlight assembly 4. That is, the mid-frame body 31 is distributed in a circumferential manner around the backlight assembly 4. It is worth noting that the mid-frame body 31 can be a continuous structure or a segmented structure. For example, when the outer contour of the backlight assembly 4 is rectangular or approximately rectangular, the circumferential distribution of the mid-frame body 31 around the backlight assembly 4 can be understood as the mid-frame body being distributed on all four sides of the rectangle of the backlight assembly 4.

[0105] The middle frame 3 also includes a first limiting protrusion 33 that contacts the surface of the light guide assembly near the display panel 2. This first limiting protrusion 33 is adjacent to the surface of the light guide plate 42 near the side-lit backlight 44 (i.e., no other components are disposed between the light guide plate 42 and the first limiting protrusion 33; for example, they may or may not contact each other; when they do not contact each other, air may be present between them). The first limiting protrusion 33 cooperates with the elastic contact member 8 to limit the light guide plate 42, jointly defining the light guide plate 42 to prevent the long side of the light guide plate 42 from warping, thereby improving the alignment of the light guide plate 42 and the side-lit backlight 44 and ensuring the display effect. Furthermore, the first limiting protrusion 33 also serves to shield light, preventing light emitted from the side-lit backlight 44 from leaking out from the non-display area.

[0106] Optionally, the number of elastic contacts 8 located on the light source side is the same as the number of side-lit backlights 44, and they are correspondingly arranged. There is a gap between adjacent elastic contacts 8 to avoid the connection points between LED light strips 442. For example, as... Figure 8A As shown, the light strip connector 45 is avoided. Taking a display module applied to a strip screen as an example, the length of the elastic contact 8 is, for example, 519 mm, the width is, for example, 4 mm, and the height is, for example, 6 mm.

[0107] Optionally, the distance between the elastic contact 8 located on the light source side and the printed circuit board 441 in the direction perpendicular to the extension plane of the printed circuit board can be in the range of 1mm to 3mm. Specifically, when the distance is less than or equal to 3mm, the alignment between the light guide plate 42 and the LED light strip 422 can be effectively controlled. When the distance is greater than or equal to 1mm, it facilitates the assembly of the side-lit backlight 44 and / or the elastic contact 8. Preferably, the distance is 1.5mm.

[0108] In some optional embodiments, the middle frame 3 further includes a first extension 37 located between the display panel 2 and the optical film layer 41. The first extension 37 is used to support the display panel 2 and limit the optical film layer 41 to prevent the edge of the optical film layer 41 from deforming and lifting, thereby ensuring the display effect.

[0109] In some alternative embodiments, such as Figure 5 and Figure 6As shown, a first buffer pad 32 can also be provided between the first extension 37 and the backlight assembly 4 to buffer the light guide assembly and protect it. The first buffer pad 32 is, for example, foam adhesive, which can be bonded to the first extension 37. Similarly, a second buffer pad 21 can also be provided between the first extension 37 and the display panel 2 to buffer the display panel 2 and protect it. The second buffer pad 21 is, for example, foam adhesive, which can be bonded to the first extension 37.

[0110] Specifically, the distance between the first limiting protrusion 33 and the light guide assembly in the plane perpendicular to the light-emitting surface of the display panel 2 is less than the distance between the first buffer pad 32 and the light guide assembly in the plane perpendicular to the light-emitting surface of the display panel 2. In this way, the first limiting protrusion 33 plays a major role in limiting the light guide assembly.

[0111] Specifically, the distance between the first limiting protrusion 33 and the light guide plate 42 in the plane perpendicular to the light-emitting surface of the display panel 2 is less than the distance between the first buffer pad 32 and the optical film layer 41 in the plane perpendicular to the light-emitting surface of the display panel 2, so that the first limiting protrusion 33 plays a limiting role on the light guide plate 42.

[0112] In some alternative embodiments, such as Figure 7 and Figure 8A As shown, the main body 31 of the middle frame has multiple first recesses 311 on the surfaces opposite to each of the first back plate side 58a and the second back plate side 58b. Each of the first back plate side 58a and the second back plate side 58b has multiple first protrusions 582 at the end opposite to the main body 31 of the middle frame, and each first protrusion 582 is correspondingly disposed in each first recess 311. By having each first protrusion 582 cooperate with each first recess 311, not only can the position of the middle frame 3 be defined, but also the warping of the middle frame 3 in the direction perpendicular to the light-emitting surface can be prevented. Therefore, since the middle frame 3 has a limiting effect on the light guide plate 42, ensuring that the middle frame 3 does not warp can further improve the alignment and neatness between the light guide plate 42 and the side-lit backlight 44. Specifically, the number of first protrusions 582 on the first back plate side 58a and the second back plate side 58b on the opposite side can be different to avoid the middle frame 3 being installed backwards during installation. Specifically, taking a display module applied to a strip screen as an example, for example, 30 first protrusions 582 can be provided on the first back panel side 58a, and for example, 31 first protrusions 582 can be provided on the second back panel side 58b (parallel to the long side) opposite to the first back panel side 58a; specifically, for example, 7 first protrusions 582 can be provided on the other two second back panel sides 58b (parallel to the short side).

[0113] In some alternative embodiments, such as Figure 7As shown, each first recess 311 corresponding to each first protrusion 582 on the side 58a of the first back plate is a blind groove, that is, the first recess 311 does not penetrate the main body of the middle frame 31 to avoid light leakage; the side 58b of the second back plate has a through groove 312 at the position corresponding to each first protrusion 582, which serves as the aforementioned first recess, and each first protrusion 582 on the side 58b of the second back plate is correspondingly disposed in each through groove 312. In this way, the bent part used to form the blind groove can be omitted on the side of the main body of the middle frame 31 opposite to the side-lit backlight 44, compared to Figure 7 The middle frame body 31 has parts on the left and right sides (referring to the left and right sides in the figure, such as the ground side and the sky side respectively). The left side is the side where the side-lit backlight 44 is located, and the right side is the opposite side of the side-lit backlight 44. By comparison, it can be seen that the right side of the middle frame body 31 omits the bending part used to form the blind slot compared to the left side. This can both avoid the display panel 2 and ensure that the through slot 312 and the first protrusion 582 have sufficient mating depth to ensure that the middle frame 3 will not warp.

[0114] In some optional embodiments, the middle frame 3 further includes a second limiting protrusion 35 located on the periphery of the display panel 2, used to define the position of the display panel 2. For example, as Figure 7 As shown, the second limiting protrusion 35 is located on the side of the first recess 311 closer to the light guide plate. Optionally, the second limiting protrusion 35 may be located, for example, near a corner of the display panel 2. For example, four second limiting protrusions 35 may be provided at the four corners of the display panel 2. It should be noted that, depending on specific needs, the second limiting protrusions 35 located on opposite sides of the display panel 2 may be arranged opposite each other or not opposite each other, that is, they may be staggered along the side of the display panel 2.

[0115] In some alternative embodiments, such as Figure 7 As shown, the middle frame 3 also includes a middle frame side 34 located on the side of each of the first back panel side 58a and the second back panel side 58b facing away from the backlight assembly 4. This middle frame side 34 is provided with a plurality of slots 341 spaced apart in its extending direction. Each slot 341 extends through the middle frame side 34 in a direction perpendicular to its extension. Furthermore, each of the first back panel side 58a and the second back panel side 58b is provided with a plurality of hooks 583 spaced apart in its extending direction. Each hook 583 engages with a corresponding slot 341 to prevent the middle frame 3 from warping. For ultra-long displays (especially strip screens exceeding 1m in length), the middle frame 3 is prone to warping in its long side direction (i.e., the X direction). To address this, by utilizing the cooperation of each first protrusion 582 with each first recess 311, and combining this with the engagement of each hook 583 with each slot 341, warping of the middle frame 3 can be further prevented.

[0116] It should be noted that the embodiments disclosed herein are not limited to using hooks and slots to achieve the snap-fit ​​between the back panel side and the middle frame side. In practical applications, any other snap-fit ​​structure can also be used, and the embodiments disclosed herein do not have any particular limitations on this.

[0117] In some alternative embodiments, such as Figure 6 As shown, the frame 1 includes a frame body 11 located on the side of the first recess 311 facing away from the first protrusion 582 and extending along a plane parallel to the light-emitting surface of the display panel 2, and frame sides 12 located on the side of each of the first back plate side 58a and the second back plate side 58b facing away from the backlight assembly 4; wherein, the two surfaces of the frame body 11 and the middle frame body 31 facing each other are in contact with each other, which can increase the pressing force on the middle frame 3, thereby further preventing the middle frame 3 from warping. Preferably, the frame sides 12 are fixedly connected to each of the first back plate side 58a and the second back plate side 58b by fasteners.

[0118] For extra-long displays (especially strip screens), for example, displays with a diagonal size of 48 inches or more and an aspect ratio of 16:5 or more, the snap-fit ​​connection between the frame 1 and the middle frame 3 alone cannot guarantee a tight connection. Therefore, the frame side 12 is fixedly connected to each of the first back plate side 58a and the second back plate side 58b by fasteners. This not only strengthens the connection between the frame 1 and the middle frame 3, but also allows the two opposing surfaces of the frame body 11 and the middle frame body 31 to fit together, i.e., the gap between them is zero, thereby increasing the pressing force on the middle frame 3 and further preventing the middle frame 3 from warping.

[0119] In one specific embodiment, the frame 1 is made of electrolytically galvanized steel sheet (EGI), and the fasteners are 18 screws with a specification of M3.0×4. Specifically, there are 2 screws on each side 12 of the frame 1 on the short side, with a spacing of 210mm, and there are 7 screws on each side 12 of the frame 1 on the long side, with a spacing of 376mm between adjacent screws. This can ensure the strength of the frame 1 and prevent deformation.

[0120] In some alternative embodiments, such as Figure 6 As shown, the orthographic projection of the frame body 11 onto the plane containing the light-emitting surface of the display panel 2 overlaps with the light-emitting surface of the display panel 2. A third buffer pad 13 can also be provided between the frame body 11 and the display panel 2 to buffer the display panel 2, thereby protecting the display panel 2 and preventing light leakage. The third buffer pad 13 is, for example, foam adhesive, which can be bonded to the frame body 11.

[0121] The display module provided in this embodiment is designed for ultra-long displays (especially strip screens), for example, displays with a diagonal size of 48 inches or more and an aspect ratio of 16:5 or more. By providing a bending portion 581 on the first back plate side 58a, defining the light guide plate 42 together with the elastic contact member 8 and the first extension portion 37, providing a first protrusion 582 on each of the first back plate side 58a and the second back plate side 58b, and making the two opposing surfaces of the frame body 11 and the middle frame body 31 fit together, by combining these structures, it can be ensured that when applied to ultra-long display modules, the side-lit backlight 44, the light guide plate 42, and the middle frame 3 will not be misaligned or warped, thereby improving the alignment of the light guide plate 42 and the side-lit backlight 44, and thus ensuring the display effect.

[0122] In some optional embodiments, the optical film layer 41 undergoes thermal expansion when heated to a certain temperature. If the expansion is excessive, it may affect the normal operation of the display module. Therefore, to ensure the display module's storage temperature meets wide-temperature operating conditions—that is, the display module can operate normally within a wide range of ambient temperatures—the storage temperature refers to the temperature of the ambient space where the display module is placed. Furthermore, the operating temperature of the display module generally does not exceed the aforementioned storage temperature range. Therefore, the expansion amount of the optical film layer 41 can be calculated using the storage temperature, or it can be calculated using the operating temperature. For example, the operating temperature is greater than or equal to -20°C and less than or equal to 60°C; or, the operating temperature is greater than or equal to -30°C and less than or equal to 80°C. The optical film layer 41 has a first reserved expansion gap between itself and the opposite component in a direction parallel to its long side, for example, as shown in the figure. Figure 6 As shown, on the side of the side-lit backlight 44 of the optical film layer 41, a first reserved expansion gap is provided between the optical film layer 41 and the first limiting protrusion 33 on the first extension 37 (i.e., the component opposite to the optical film layer 41). A second reserved expansion gap is provided between the optical film layer 41 and the component opposite to it in a direction parallel to its short side.

[0123] The aforementioned first and second reserved expansion gaps are the distances between the optical film layer 41 and its opposite component at room temperature (25°C). These gaps should be greater than or equal to the thermal expansion of the optical film layer 41 in its long and short directions. Optionally, the aforementioned first and second reserved expansion gaps can, for example, be greater than or equal to the thermal expansion of the optical film layer 41 in its long and short directions at the highest operating temperature of the display module. That is, even if the display module is used at its highest operating temperature (e.g., 60°C or 80°C), the distance between the optical film layer 41 and its opposite component can still be greater than or equal to 0.

[0124] Similarly, to ensure the display module's operating temperature (or storage temperature) meets wide-temperature operating conditions, the light guide plate 42 has a third reserved expansion gap between itself and the opposite component in the direction parallel to its long side, and a fourth reserved expansion gap between itself and the opposite component in the direction parallel to its short side. For example, as... Figure 6 As shown, on the side of the light guide plate 42 where the side-lit backlight 44 is located, a third reserved expansion gap is provided between the light guide plate 42 and the side-lit backlight 44 (that is, the component opposite to the light guide plate 42).

[0125] The aforementioned third and fourth reserved expansion gaps are the distances between the light guide plate 42 and its opposite component under room temperature (25°C) conditions. These gaps should be greater than or equal to the thermal expansion of the light guide plate 42 in its long and short directions. Optionally, the aforementioned third and fourth reserved expansion gaps can, for example, be greater than or equal to the thermal expansion of the light guide plate 42 in its long and short directions under the conditions of the display module's highest operating temperature. That is, even if the display module is used under the conditions of its highest operating temperature (e.g., 60°C or 80°C), it can still be ensured that the distance between the light guide plate 42 and its opposite component is greater than or equal to 0.

[0126] In some optional embodiments, the projection of the light-incident surface of the light guide plate 42 onto the plane of the printed circuit board 441 is a first strip (e.g., a rectangle), and the orthographic projection of the LED strip 442 onto the plane of the printed circuit board 441 is a second strip (e.g., a rectangle). At room temperature (25°C), the length of the first strip is greater than the length of the second strip, and the two ends of the first strip are closer to the outer contour lines of the display module opposite to each other in the extension direction of the first strip compared to the two ends of the second strip. At the lowest storage temperature of the display module (e.g., -20°C), the length of the first strip is greater than or equal to the length of the second strip, and the two ends of the second strip are not closer to the outer contour lines of the display module opposite to each other in the extension direction of the first strip compared to the two ends of the first strip.

[0127] Specifically, such as Figure 8B As shown, the solid-lined box represents the projection of the light-incident surface of the light guide plate 42 onto the plane of the printed circuit board 441, i.e., the first strip; the dashed-lined box represents the orthographic projection of the LED strip 442 onto the plane of the printed circuit board 441, i.e., the second strip. At room temperature (25℃), the length of the first strip is greater than the length of the second strip, and the two ends of the first strip are closer to the outer contour lines of the display module on both sides, which are positioned opposite each other in the extension direction of the first strip, compared to the two ends of the second strip. Specifically, the lengths of the first and second strips have a length difference D, i.e., Figure 8B There is a spacing D / 2 between the left ends of the first strip and the left ends of the second strip, and a spacing D / 2 between the right ends of the first strip and the right ends of the second strip. Under the minimum operating temperature of the display module (e.g., -20℃ or -30℃), the two ends of the first strip retract from their original positions 421 to positions 421'. At this time, the length of the first strip (i.e., the length of the two ends at positions 421') is greater than or equal to the length of the second strip (the spacing between the two LEDs 422a closest to its two ends), and the two ends of the second strip are not closer to the outer contour lines of the display module on both sides opposite to the two ends of the first strip than the two ends of the first strip. In this way, under the condition of the lowest operating temperature (e.g. -20℃ or -30℃), when the light guide plate 42 shrinks from both ends to the middle in the long side direction, it ensures that the two ends of the second strip will never extend from the two ends of the first strip in the direction close to the outer contour line on both sides of the display module. This can avoid light leakage due to the extension of the LED light strip, and thus enable the storage temperature of the display module to meet the wide temperature operation conditions.

[0128] In some optional embodiments, at room temperature (25°C), the length difference D between the first stripe and the second stripe can satisfy the following relationship:

[0129] D≥1.1×S 导

[0130] Among them, S 导The total shrinkage of the light guide plate 42 from both ends towards the middle in the extension direction of the first strip is equal to the product of the length of the light guide plate 42, a specified temperature difference, and the coefficient of thermal expansion. The specified temperature difference is the difference between room temperature (25°C) and the minimum operating temperature of the display module (e.g., -20°C or -30°C). For example, under the condition that the minimum operating temperature of the display module is -20°C, the length of the light guide plate 42 is 2151.68 mm, the specified temperature difference is 25°C - (-20°C) = 45°C, and the coefficient of thermal expansion of the light guide plate 42 is 6 × 10⁻⁵ (1 / °C). Therefore, S_guide equals 5.8 mm, and the spacing D is greater than or equal to 5.8 mm × 1.1 = 6.38 mm. Alternatively, to avoid dark corners on the light guide plate 42 due to excessively large spacing D, which would affect the display effect, the spacing D is less than or equal to 7 mm.

[0131] In some alternative embodiments, D is greater than or equal to the S-leader to meet the limit design requirements.

[0132] Preferably, D ≥ 1.2 × S 导 This is to further ensure the display panel's display reliability.

[0133] In some optional embodiments, the middle frame 3 will undergo thermal expansion when heated to a certain temperature. If the expansion is too large, it may affect the normal use of the display module. Therefore, in order to ensure the structural stability of the middle frame 3 and to ensure that the operating temperature (or storage temperature) of the display module meets wide-temperature operating conditions, such as... Figure 9 As shown, the middle frame 3 includes multiple segments sequentially spliced ​​along its circumference. There is a gap between each pair of adjacent segments, and the end of the first segment in each pair of adjacent segments has a first overlapping portion extending towards the second segment, while the end of the second segment has a second overlapping portion extending towards the first segment. The second overlapping portion overlaps with the first overlapping portion. A first seam exists between the first overlapping portion and the end of the second segment; a second seam exists between the second overlapping portion and the end of the first segment. By using the first and second seams, when the middle frame 3 expands thermally in its long direction from room temperature to the maximum operating temperature of the display module (e.g., 60°C or 80°C), the compression between adjacent segments at the splicing point can be avoided, causing the back panel 5 to bulge. Simultaneously, by overlapping the second overlapping portion with the first overlapping portion, light leakage between adjacent segments at the splicing point can be avoided when the middle frame 3 contracts in its long direction from room temperature to the minimum operating temperature of the display module (e.g., -20°C or -30°C).

[0134] In a specific embodiment, Figure 9As shown, the outer contours of both the display panel 2 and the middle frame 3 are rectangular, which may include rounded rectangles, meaning that at least one of the four corners of the rectangle is rounded. The above segmentation consists of six segments, four of which are straight line segments 3a, and the remaining two are broken line segments 3b. Two straight line segments 3a are located on one of the long sides of the display panel 2, and the other two are located on the other long side of the display panel 2. The two straight line segments 3a on the same side are parallel to their respective long sides (i.e., in the X direction) and are joined together. Each of the two broken line segments 3b includes a first sub-segment 3ba and two second sub-segments 3bb. The first sub-segment 3ba is located on one of the short sides of the display panel 2 and is parallel to it. The two second sub-segments 3bb are located on one of the two long sides of the display panel 2 and are parallel to them. One end of each second sub-segment 3bb is connected to both ends of the first sub-segment 3ba, and the other end of each second sub-segment 3bb is joined to the adjacent straight line segment 3a. The aforementioned broken line segment 3b is approximately U-shaped, which helps to improve the structural stability of the middle frame 3.

[0135] For two adjacent straight lines, divide into segments 3a, such as Figure 10A As shown, the end 3a1 of the first of two adjacent straight segments 3a (i.e., the left straight segment 3a) is provided with a first overlapping portion 3c1 extending towards the second (i.e., the right straight segment 3a), and the end 3a2 of the second (i.e., the right straight segment 3a) is provided with a second overlapping portion 3c2 extending towards the first (i.e., the left straight segment 3a). The second overlapping portion 3c2 overlaps with the first overlapping portion 3c1. A first seam B1 is formed between the first overlapping portion 3c1 and the end 3a2 of the second (i.e., the right straight segment 3a); a second seam B2 is formed between the second overlapping portion 3c2 and the end 3a1 of the first (i.e., the left straight segment 3a). The widths of the first seam B1 and the second seam B2 can be the same or different.

[0136] For the second sub-segment 3bb and the adjacent linear segment 3a, as follows: Figure 10BAs shown, the second sub-segment 3bb and the end of the first of the adjacent straight segments 3a (i.e., straight segment 3a) are provided with a first overlapping portion 3c1 extending towards the second (i.e., second sub-segment 3bb). The end of the second (i.e., second sub-segment 3bb) is provided with a second overlapping portion 3c2 extending towards the first (i.e., straight segment 3a). The second overlapping portion 3c2 overlaps with the first overlapping portion 3c1. A first seam B3 is formed between the first overlapping portion 3c1 and the end of the second (i.e., second sub-segment 3bb). A second seam B4 is formed between the second overlapping portion 3c2 and the end of the first (i.e., straight segment 3a). The widths of the first seam B3 and the second seam B4 can be the same or different.

[0137] In some optional embodiments, the width of each of the first seam B1 and the second seam B2 between two straight segments 3a on the same side is greater than the width of each of the first seam B3 and the second seam B4 between the second sub-segment 3bb and the adjacent straight segment 3a. Since the total seam width on the same long side can be calculated, the width of the first seam B3 between the second sub-segment 3bb and the adjacent straight segment 3a can be set first to meet assembly tolerances. Then, the difference between the total seam width and the width of the first seam B3 between the second sub-segment 3bb and the adjacent straight segment 3a is calculated; this difference is used as the width of the first seam B1 between the two straight segments 3a. The overlap amount of the second overlap portion 3c2 and the first overlap portion 3c1 on the two straight segments 3a on the same side in the direction of mutual extension is greater than the overlap amount of the second overlap portion 3c2 and the first overlap portion 3c1 on the second sub-segment 3bb and the adjacent straight segment 3a in the direction of mutual extension. The method for setting the overlap amount is similar to the method for setting the seam width mentioned above.

[0138] In some optional embodiments, the total width of the seam of the middle frame 3 along its long side satisfies the following relationship to ensure that the middle frame 3 will not bulge at the seam when it expands under high temperature conditions (e.g., 80°C) by pressing against the back panel 5:

[0139] B 总 >0.9×(G1-G2)

[0140] Among them, B 总 G1 is the total width of the seam of the middle frame 3 along its long side, which is equal to the sum of the width of the first seam B1 between two straight segments 3a along the long side of the middle frame 3 and the width of the first seam B3 between each second sub-segment 3bb and the adjacent straight segment 3a; G2 is the thermal expansion of the middle frame 3 along its long side from room temperature to the maximum operating temperature of the display module; G3 is the thermal expansion of the back plate 5 along its long side from room temperature to the maximum operating temperature of the display module.

[0141] In one specific embodiment, the middle frame 3 is made of PC (Polycarbonate) material, with a coefficient of thermal expansion of 0.00003 and a length of 2171.08 mm. The amount of thermal expansion G1 of the middle frame 3 in the direction parallel to its long side is equal to the product of the length of the middle frame 3, the high temperature difference, and the coefficient of thermal expansion of the middle frame 3. The high temperature difference is the difference between room temperature and the highest operating temperature of the display module. For example, if the highest operating temperature of the display module is 80°C and the room temperature is 25°C, then the high temperature difference is 55°C. Therefore, the amount of thermal expansion G1 of the middle frame 3 in the direction of its long side from room temperature to the highest operating temperature of the display module can be calculated to be 3.58 mm. The back panel 5 is made of aluminum with a coefficient of thermal expansion of 0.000023 and a length of 2171.08 mm. Therefore, the thermal expansion G2 of the back panel 5 along its long side from room temperature to the maximum operating temperature of the display module is calculated to be 2.75 mm. Consequently, the difference between the thermal expansion G1 of the middle frame 3 along its long side from room temperature to the maximum operating temperature of the display module and the thermal expansion G2 of the back panel 5 along its long side from room temperature to the maximum operating temperature of the display module is calculated to be 0.83 mm. The width of each of the first seam B1 and the second seam B2 between the two straight segments 3a on the same side is 1.5 mm. The width of each of the first seam B3 and the second seam B4 between the second sub-segment 3bb and the adjacent straight segment 3a is 0.2 mm. Therefore, the total seam width B of the middle frame 3 along its long side can be calculated. 总 The total width B of the seam is 1.9mm. 总 The thickness is greater than 0.9 × 0.83 mm = 1.89 mm, which ensures that the back panel 5 will not bulge due to the compression of the middle frame 3 at the joint under high temperature conditions.

[0142] In some alternative embodiments, B 总 It is greater than (G1-G2) to meet the requirements of extreme design.

[0143] Preferably, B 总 >0.95×(G1-G2) to further ensure the display reliability of the display panel.

[0144] In some optional embodiments, the minimum overlap amount of each first overlap 3c1 and corresponding second overlap 3c2 of the middle frame 3 in the direction of its long side satisfies the following relationship to ensure that the middle frame does not leak light at the splice when it shrinks under low temperature conditions:

[0145] Cmin>1.1×S 中

[0146] In this formula, considering that the activity space of the middle frame 3 may accumulate in one place, Cmin is the minimum value of the above-mentioned overlap amount. This minimum value of overlap amount is the minimum value among the overlap amounts corresponding to the two straight line segments 3a on the long side of the middle frame 3 and the overlap amounts corresponding to the adjacent straight line segments 3a of each second sub-segment 3bb; S 中 This is the amount of shrinkage of the middle frame 3 along its long side as it decreases from room temperature to the minimum operating temperature of the display module.

[0147] Specifically, the shrinkage of the middle frame 3 in the direction parallel to its long side is equal to the product of the length of the middle frame 3, the low-temperature temperature difference, and the coefficient of thermal expansion of the middle frame 3. This low-temperature temperature difference is the difference between room temperature and the minimum operating temperature of the display module. For example, if the minimum operating temperature of the display module is -20℃ and the room temperature is 25℃, then the low-temperature temperature difference is 45℃. From this, the shrinkage S of the middle frame 3 in the direction parallel to its long side can be calculated. 中 The overlap is 2.93mm. The overlap between the second overlapping portion 3c2 and the first overlapping portion 3c1 on the two straight segments 3a on the same side in the direction of mutual extension is 4.5mm. The overlap between the second sub-segment 3bb and the second overlapping portion 3c2 and the first overlapping portion 3c1 on the adjacent straight segment 3a in the direction of mutual extension is 3.3mm. The minimum of these two values ​​is taken as the minimum overlap value Cmin. Therefore, the minimum overlap value Cmin of the middle frame 3 is 3.3mm (greater than 1.1 × 2.93mm = 3.223mm), which ensures that the second overlapping portion 3c2 and the first overlapping portion 3c1 can still remain overlapping each other during the process of cooling from room temperature to the minimum operating temperature of the display module, preventing light leakage at the splicing point between adjacent segments.

[0148] In some alternative embodiments, C min Greater than S 中 To meet the needs of extreme design.

[0149] Preferably, Cmin > 1.2 × S 中 This is to further ensure the display panel's display reliability.

[0150] In some alternative embodiments, in order to allow for a certain thermal expansion gap between the optical film layer 41 and the opposite middle frame side 34, such as Figure 11A , Figure 11B , Figure 12A , Figure 12B and Figure 13As shown, at least one middle frame side 34 is provided with a plurality of third recesses 342; the first back plate side 58a and / or the second back plate side 58b are provided with a plurality of fourth recesses 583 on the back plate side corresponding to the middle frame side 34 provided with the third recesses 342; the optical film layer 41 is provided with a plurality of fourth protrusions 411 on the side corresponding to the middle frame side 34 provided with the third recesses 342; and when the optical film layer 41 undergoes thermal expansion, each fourth protrusion 411 can pass through the fourth recesses 581 and extend into each third recess 342 to ensure that sufficient expansion space is reserved for the optical film layer 41.

[0151] Preferably, both the display panel and the outer contour of the middle frame 3 are rectangular, and the third recess 342 is located on the shorter side corresponding to the rectangular outer contour formed by the middle frame 3. For the same temperature increase, the optical film layer 41 expands more along the shorter side than along the longer side; providing the third recess 342 allows sufficient expansion space for the optical film layer 41. Optionally, the third recess 342 can be located on the two shorter sides corresponding to the rectangular outer contour formed by the middle frame 3. Optionally, the third recess 342 can be located only on the two shorter sides corresponding to the rectangular outer contour formed by the middle frame 3, and not on the two corresponding longer sides.

[0152] In some alternative embodiments, such as Figure 12A As shown, the third recess 342 can be, for example, a through groove to ensure sufficient thermal expansion clearance for the optical film layer 41. The display module also includes a light-shielding member 343, located between the side edge 34 of the mid-frame and the side edge 12 of the frame 1, for example, on the surface of the mid-frame side 34 facing away from the optical film layer 41. The orthogonal projection of the light-shielding member 343 onto the side edge 34 of the mid-frame covers the third recess 342 to prevent light leakage. The light-shielding member 343 can be, for example, light-shielding tape.

[0153] In some alternative embodiments, to ensure that the reflector 43 is not misaligned, such as Figure 6 and Figure 14A As shown, the reflector 43 has multiple second protrusions 432 protruding towards the sidelight 44 on the side opposite to the printed circuit board 441 of the side-lit backlight 44. These second protrusions 432 are spaced apart along the side of the reflector 43 opposite to the sidelight 44. One end of each second protrusion 432 opposite to the printed circuit board 441 is located below the LED light strip 442, thus defining the position of the reflector 43. Optionally, the portion of the reflector 43 other than the second protrusions 432 does not overlap with the LED light strip 442 in a direction perpendicular to the light-emitting surface of the display panel 2.

[0154] Optionally, when the display module is in landscape orientation, i.e., the long side of the display module is parallel to the placement surface of the display module, the side-lit backlight 44 is located on the ground side of the display module. The ground side refers to the side of the display module facing the placement surface when it is placed on the placement surface.

[0155] Optionally, the surface of each second protrusion 432 opposite to the LED light strip 442 is covered with an anti-reflective layer to prevent light reflection. This layer prevents the second protrusion 432 from reflecting light emitted from the LED light strip 442 and causing bright spots on the screen. For example, this anti-reflective layer is printed with black ink. The second protrusion 432 not only defines the position of the reflector 43 but also ensures that the main body of the reflector 43 does not shift below the LED light strip 442, thus preventing bright spots on the screen. Therefore, the edges of the main body of the reflector 43 do not require a black anti-reflective layer, simplifying the process and reducing costs.

[0156] In some alternative embodiments, such as Figure 14B As shown, the length of the second protrusion 432 in the direction parallel to the side of the reflector 43 opposite to the side-lit backlight 44 decreases away from that side. This improves the structural stability of the second protrusion 432, making it less prone to bending. In one specific embodiment, there are, for example, five second protrusions 432, evenly distributed along the side of the reflector 43 opposite to the side-lit backlight 44; the orthographic projection shape of the second protrusion 432 on the plane parallel to the reflector 43 is, for example, an isosceles trapezoid with a top side length of 5 mm, a base side length of 10 mm, and a height of 1.5 mm. Of course, in practical applications, the orthographic projection shape of the second protrusion 432 on the plane parallel to the reflector 43 can also be any other shape, such as a rectangle.

[0157] In some alternative embodiments, to achieve the positioning of the backplate 5 and the reflector 43, such as... Figure 14A As shown, a second recess 431 is provided on the side of the reflector 43 opposite to the side-lit backlight 44, and a third protrusion (not shown) is provided on the side of the backplate opposite to the second recess 431, which is located in the second recess 431. Optionally, there may be one second recess 431, located at or near the middle of the side of the reflector 43 opposite to the side-lit backlight 44; or there may be multiple second recesses 431, spaced apart on the side of the reflector 43 opposite to the side-lit backlight 44. Optionally, the length × width of the second recess 431 may be, for example, 20.4 mm × 4.7 mm.

[0158] In some optional embodiments, the display module provided in this disclosure is suitable for ultra-long displays (especially strip screens, the length of which is, for example, more than 2m). For example, the diagonal size of the display area of ​​the display panel 2 is greater than or equal to 48 inches; the aspect ratio of the display area of ​​the display panel 2 is greater than or equal to 16:5.

[0159] In summary, the display module provided in this disclosure, for ultra-long displays (especially strip screens over 2m), avoids light leakage due to misalignment between the side-lit backlight and the light guide plate by designing the alignment between the light guide plate and the side-lit backlight; ensures that the optical film layer will not be misaligned or warped at the sides by designing the alignment between the optical film layer and the middle frame; and ensures that the reflective sheet will not be misaligned by designing the alignment between the reflective sheet, the side-lit backlight, and the back plate.

[0160] In some optional embodiments, the display module provided in this disclosure can improve the overall strength of the back panel by utilizing a first reinforcing rib structure and by combining a second reinforcing rib structure to improve the strength of the back panel in a local area. This can effectively improve the strength of the back panel, thereby avoiding bending and twisting deformation of ultra-long display screens (especially strip screens), and thus ensuring the display effect.

[0161] In some optional embodiments, the display module provided in this disclosure, by designing the thermal expansion spacing of at least one of the optical film layer and the light guide plate, can still ensure normal operation of the display module when the optical film layer and the light guide plate undergo thermal expansion, thereby enabling the display module to meet wide-temperature operating conditions for storage. Furthermore, to ensure the structural stability of the mid-frame and achieve wide-temperature operating conditions for the display module's storage, the mid-frame adopts a segmented design. By designing the seam width between segments and the overlap amount of the joints, it is possible to prevent adjacent segments from being squeezed at the joint when thermal expansion occurs under high-temperature conditions, causing the back panel to bulge. Simultaneously, it is possible to prevent light leakage between adjacent segments at the joint under low-temperature conditions.

[0162] As another technical solution, this disclosure also provides a display device, which includes the display module provided in this disclosure. The display module is a bar-shaped display module, meaning the aspect ratio of the display area is greater than 1. For example, the aspect ratio of the display area of ​​display panel 2 is greater than or equal to 16:5. Specifically, for example, the diagonal size of the display area of ​​display panel 2 is 48 inches, the aspect ratio of the display area of ​​display panel 2 is 16:3, and the resolution is 3840×720; for example, the diagonal size of the display area of ​​display panel 2 is 47.1 inches, the aspect ratio of the display area of ​​display panel 2 is 24:1, and the resolution is 3840×160; for example, the diagonal size of the display area of ​​display panel 2 is 36.6 inches, the aspect ratio of the display area of ​​display panel 2 is 16:2.4, and the resolution is 1920×290; for example, the diagonal size of the display area of ​​display panel 2 is 35 inches, the aspect ratio of the display area of ​​display panel 2 is 18:1, and the resolution is 2880×160.

[0163] The display device provided in this disclosure embodiment can improve the alignment of the light guide plate and the side-lit backlight by adopting the display module provided in this disclosure embodiment, thereby ensuring the display effect, and is especially suitable for ultra-long display screens (especially strip screens, whose length is, for example, more than 2m).

[0164] The display device provided in this disclosure can be applied, for example, to intelligent transportation systems such as buses and subways. It can be used for subway platform screen door displays and semi-outdoor station sign displays to facilitate passengers' viewing of subway station information and improve their travel experience. Furthermore, it can also be used for advertising displays on subways and buses.

[0165] It should be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A display module, characterized in that, The device includes a display panel, a backplate located on the side opposite to the light-emitting surface of the display panel, and a backlight assembly located between the display panel and the backplate. The backlight assembly includes a light guide assembly, which includes an optical film layer, a light guide plate, and a reflective sheet arranged sequentially in a direction away from the display panel. The backlight assembly also includes a side-lit backlight source disposed opposite to the light guide plate. The backplate includes a backplate body located on the side of the backlight assembly opposite to the display panel. The backplate body includes a contact structure recessed from the side away from the light guide assembly toward the light guide assembly, the contact structure being in contact with the light guide assembly; a receiving space is formed between the backplate body and the light guide assembly, and on the side of the contact structure closer to the side-lit backlight, an elastic contact member is disposed in the receiving space, the elastic contact member being in contact with the backplate body and being disposed adjacent to the light guide assembly; The display module further includes a middle frame, which includes a middle frame body surrounding the backlight assembly; the middle frame also includes a first limiting protrusion adjacent to the surface of the light guide assembly near the display panel, the first limiting protrusion cooperating with the elastic contact member to limit the light guide plate. The backplate also includes a first backplate side located on the side of the side-lit backlight away from the light guide plate; The back panel also includes a second back panel side, which is located on at least one side of the display module other than the side-lit backlight distribution side. The main body of the middle frame and each of the first and second back plate sides have multiple first recesses on their opposing surfaces in a direction perpendicular to the light-emitting surface. Each of the first and second back plate sides has multiple first protrusions at its end opposite the main body of the middle frame, and each first protrusion is correspondingly disposed in each of the first recesses. Each of the first recesses corresponding to each of the first protrusions on the side of the first back plate is a blind groove; each of the first recesses corresponding to each of the first protrusions on the side of the second back plate is a through groove.

2. The display module according to claim 1, characterized in that, The first limiting protrusion is adjacent to the surface of the light guide plate near the side-lit backlight and the side of the light guide plate near the display panel. The mid-frame also includes a first extension located between the display panel and the optical film layer, the first extension being used to support the display panel and limit the optical film layer.

3. The display module according to claim 1, characterized in that, A bend is provided on the side of the first back panel, and the bend extends from the side of the first back panel to the side of the side-lit backlight away from the back panel body.

4. The display module according to claim 1, characterized in that, The display module further includes a frame, which comprises a frame body located on the side of the first recess away from the first protrusion and extending along a plane parallel to the light-emitting surface of the display panel, and a frame side located on the side of each of the first back panel side and the second back panel side away from the backlight assembly; wherein... The two opposing surfaces of the frame body and the middle frame body are fitted together. The side of the frame is fixedly connected to each of the side of the first back plate and the side of the second back plate by fasteners.

5. The display module according to claim 1, characterized in that, The side-lit backlight includes a printed circuit board and an LED light strip disposed on the printed circuit board; The reflector sheet has multiple second protrusions on the side opposite to the printed circuit board, which protrude toward the side-lit backlight. The multiple second protrusions are spaced apart along the side of the reflector sheet opposite to the side-lit backlight, and the end of each second protrusion opposite to the printed circuit board is located below the LED light strip.

6. The display module according to claim 5, characterized in that, The outer surface of each of the second protrusions is covered with an anti-reflective layer.

7. The display module according to claim 5, characterized in that, The reflector has a second recess on the side opposite to the side-lit backlight, and a third protrusion is provided on the side of the back plate opposite to the second recess, the third protrusion being located in the second recess.

8. The display module according to claim 1, characterized in that, The projected outline of the backplate body on the plane where the light-emitting surface of the display panel is located is rectangular; The contact structure includes at least three sub-contact structures spaced apart along the long side of the back plate body; the back plate body is also provided with a first reinforcing rib structure recessed from the side away from the light guide component toward the light guide component; The first reinforcing rib structure includes two first reinforcing ribs and at least two second reinforcing ribs, wherein the two first reinforcing ribs are respectively disposed on both sides of the at least three sub-contact structures near the two long sides of the back plate body, and are parallel to the long sides of the back plate body; A second reinforcing rib is provided in the interval region between each two adjacent sub-contact structures. Each second reinforcing rib is located between two first reinforcing ribs and is parallel to the short side of the back plate body.

9. The display module according to claim 8, characterized in that, At least one of the sub-contact structures is provided with a second reinforcing rib structure, the second reinforcing rib structure including at least one third reinforcing rib and / or at least one fourth reinforcing rib, wherein the third reinforcing rib is parallel to the long side of the back plate body; and the fourth reinforcing rib is parallel to the short side of the back plate body.

10. The display module according to claim 8, characterized in that, There is a gap between each of the first reinforcing ribs and each of the sub-contact structures, and a reinforcing rib plate is provided on the side of the back panel body near the backlight assembly, in the gap between each of the first reinforcing ribs and the sub-contact structures.

11. The display module according to claim 10, characterized in that, The interval between one of the first reinforcing ribs and the sub-contact structure is a first interval, and the interval between the other first reinforcing rib and the sub-contact structure is a second interval, wherein the first interval is smaller than the second interval; The reinforcing rib in the first interval has an L-shaped cross-section in the plane perpendicular to the light-emitting surface of the display panel; the reinforcing rib in the second interval has a U-shaped cross-section in the plane perpendicular to the light-emitting surface of the display panel. The second interval is closer to the side-lit backlight than the first interval.

12. The display module according to claim 1, characterized in that, The side-lit backlight includes a printed circuit board and an LED light strip disposed on the printed circuit board; The projection of the light-incident surface of the light guide plate onto the plane of the printed circuit board is a first strip, and the orthographic projection of the LED strip onto the plane of the printed circuit board is a second strip. Under room temperature conditions, the length of the first strip is greater than the length of the second strip, and the two ends of the first strip are closer to the outer contour lines of the display module on both sides that are opposite to each other in the extension direction of the first strip than the two ends of the second strip. Under the minimum storage temperature condition of the display module, the length of the first strip is greater than or equal to the length of the second strip, and neither end of the second strip is closer to the outer contour lines of the display module that are opposite to each other in the extension direction of the first strip than the ends of the first strip.

13. The display module according to claim 12, characterized in that, At room temperature, the length difference D between the first stripe and the second stripe satisfies the following relationship: D≥1.1×S 导 Among them, S 导 The total shrinkage amount is the amount by which the light guide plate contracts from both ends to the middle in the extension direction of the first strip. The total shrinkage amount is equal to the product of the length of the light guide plate, a specified temperature difference, and the coefficient of thermal expansion. The specified temperature difference is the difference between room temperature and the minimum operating temperature of the display module.

14. The display module according to claim 1, characterized in that, The middle frame includes multiple segments spliced ​​together in sequence along its circumference. There is a gap between each two adjacent segments, and the end of the first of each pair of adjacent segments is provided with a first overlapping portion extending toward the second segment, and the end of the second segment is provided with a second overlapping portion extending toward the first segment. The second overlapping portion and the first overlapping portion overlap each other. The first overlapping portion has a first seam between its end and the end of the second portion; the second overlapping portion has a second seam between its end and the end of the first portion.

15. The display module according to claim 14, characterized in that, Both the display panel and the middle frame have rectangular outer contours. The segmentation consists of six segments, four of which are straight line segments and the remaining two are broken line segments; Two of the straight line segments are located on one side of one of the long sides of the display panel, and the other two straight line segments are located on the other side of the display panel. The two straight line segments on the same side are parallel to the long side and are joined together. Each of the two line segments includes a first sub-segment and two second sub-segments, wherein the first sub-segment is located on one side of the short side of the display panel and is parallel to the short side, and the two second sub-segments are located on one side of the two long sides of the display panel and are parallel to the long sides; one end of each of the two second sub-segments is connected to both ends of the first sub-segment, and the other end of each of the two second sub-segments is connected to the adjacent straight line segment.

16. The display module according to claim 15, characterized in that, The total width of the seam along the long side of the middle frame satisfies the following relationship to ensure that the middle frame will not bulge at the seam when it expands under high temperature conditions, thus preventing the back panel from being squeezed. B 总 >0.9×(G1-G2) Among them, B 总 G1 is the total width of the seam along the long side of the middle frame, which is equal to the sum of the width of the first seam between two straight segments along the long side of the middle frame and the width of the first seam between each second sub-segment and the adjacent straight segment; G2 is the thermal expansion of the middle frame along its long side from room temperature to the maximum operating temperature of the display module; G3 is the thermal expansion of the back panel along its long side from room temperature to the maximum operating temperature of the display module.

17. The display module according to claim 15, characterized in that, The minimum overlap between the first overlapping portion and the corresponding second overlapping portion of the middle frame along its long side satisfies the following relationship to ensure that no light leaks at the joints when the middle frame shrinks under low temperature conditions: Cmin>1.1×S 中 Wherein, Cmin is the minimum overlap amount, which is the minimum of the overlap amounts corresponding to the two straight line segments along the long side of the middle frame and the overlap amounts corresponding to the second sub-segment and the adjacent straight line segment; S 中 The shrinkage of the mid-frame in its long side direction from room temperature to the minimum operating temperature of the display module.

18. The display module according to claim 1, characterized in that, The main body of the middle frame includes a middle frame side located on the side opposite to the light guide assembly of each of the first back plate side and the second back plate side; at least one of the middle frame sides is provided with a plurality of third recesses, and the back plate side corresponding to the middle frame side with the third recess is provided with a plurality of fourth recesses, and the optical film layer is provided with a plurality of fourth protrusions on the side corresponding to the middle frame side with the third recess.

19. The display module according to claim 18, characterized in that, The third recess is a through groove; the display module also includes a light-shielding member, which is located on the side of the middle frame away from the optical film layer; the orthographic projection of the light-shielding member on the side of the middle frame covers the third recess.

20. The display module according to claim 1, characterized in that, The diagonal size of the display area of ​​the display panel is greater than or equal to 48 inches; the aspect ratio of the display area of ​​the display panel is greater than or equal to 16:

5.

21. A display device, characterized in that, The display module includes any one of claims 1-20, wherein the display module is a bar-shaped display module.

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