Backlight module, display module and display device thereof

Abstract

The embodiment of the invention provides a backlight module, a display module and a display device thereof, relates to the technical field of display, and is used for reducing a frame of the display device. The backlight module comprises a back plate, a light guide plate, a light bar and an elastic piece. The back plate comprises a bottom plate and side plates, and the side plates surround the bottom plate to form an assembly space. The side plate is provided with an opening. The light guide plate is arranged in the assembly space. The light guide plate comprises a side face opposite to the side plate. The light bar is arranged between the light guide plate and the side plate. The elastic piece comprises a supporting part and a first positioning part, and the supporting part is arranged between the light guide plate and the bottom plate. The first positioning part is arranged on the side, away from the bottom plate, of the supporting part. The first positioning part is located at the opening, and the orthographic projection of the first positioning part on the reference surface is located in the range of the orthographic projection of the opening on the reference surface. The reference surface is a side surface of the light guide plate opposite to the first positioning part. The first positioning part and the light bar are located on different sides of the light guide plate and abut against the light guide plate. The backlight module is used for displaying images.

Description

Technical Field

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

[0002] With the rapid development of display technology, display devices have gradually become ubiquitous in people's lives. Among them, liquid crystal display devices (LCD) are widely used in display devices such as mobile phones, televisions, laptops, and medical displays due to their advantages of low cost, high reliability, high brightness, and long service life.

[0003] Currently, the market has increasingly narrowed the borders of display devices and has increasingly higher requirements for the reliability of display devices. However, as the market's standards for product reliability increase, it is increasingly difficult to reduce the borders of display devices. Therefore, how to reduce the borders of display devices is a problem that needs to be solved. Summary of the invention

[0004] The purpose of the embodiments of the present disclosure is to provide a backlight module, a display module and a display device thereof, so as to reduce the frame of the display device.

[0005] To achieve the above objectives, the embodiments of the present disclosure provide the following technical solutions:

[0006] In one aspect, a backlight module is provided. The backlight module includes a back plate, a light guide plate, a light bar and an elastic member. The back plate includes a bottom plate and a side plate, wherein the side plate is arranged on one side of the bottom plate and is arranged around the circumference of the bottom plate to form an assembly space. The side plate is provided with an opening. The light guide plate is arranged in the assembly space. The light guide plate includes a side surface arranged opposite to the side plate. The light bar is arranged between the light guide plate and the side plate, and the light-emitting side of the light bar is opposite to the side surface of the light guide plate. The elastic member includes a support portion and a first positioning portion, wherein the support portion is arranged between the light guide plate and the bottom plate. The first positioning portion is arranged on a side of the support portion away from the bottom plate. The first positioning portion is located at the opening, and the orthographic projection of the first positioning portion on a reference surface is located within the range of the orthographic projection of the opening on the reference surface. The reference surface is the side surface of the light guide plate opposite to the first positioning portion. The first positioning portion and the light bar are located on different sides of the light guide plate and abut against the light guide plate.

[0007] In the above backlight module, since the first positioning portion is not located between the side plate and the side surface of the light guide plate, the frame width of the display device can save the thickness of the side plate. The frame width of the display device satisfies the following formula:

[0008] W LCM≥T0+D LGP～AA +T MF +T b +Gap Total .

[0009] Among them, W LCM is the frame width of the display device, T0 is the thickness of the first positioning portion in the fourth direction, D LGP～AA is the distance between the boundary of the light guide plate and the boundary of the display area, T MF is the thickness of the middle frame in the fourth direction, T b is the thickness of the front frame, Gap Total is the sum of the gaps between the components in the fourth direction.

[0010] Based on the above formula, it can be known that the frame width of the display device does not need to consider the thickness of the side plate. Therefore, the first positioning portion is not located between the side plate and the side of the light guide plate, which can reduce the frame width of the display device. For example, taking the display device as a rectangle, that is, the orthographic projection of the light guide plate on the bottom plate is a rectangle, and along the second direction, the light bar is arranged on one side of the light guide plate. In the first direction, T0 is 1.4 mm, D LGP～AA 2mm, T MF Gap is 0.7mm Total 0.2mm, W LCM It can reach 516.64mm.

[0011] In some embodiments, in an orthographic projection onto the base plate, a length of the opening is greater than or equal to a length of the first positioning portion; and / or a length of the opening is less than a length of the support portion.

[0012] In some embodiments, the side includes a first side and a second side, the side panel includes a first side panel and a second side panel, the light strip is located between the first side panel and the first side, each second side panel is arranged opposite to one of the second side panels, and each second side panel is provided with the opening.

[0013] In some embodiments, the opening includes a first opening, and the elastic member includes a first elastic member located at the first opening. Along the third direction, the first opening penetrates the second side plate, and the third direction is a direction perpendicular to the bottom plate; the second side plate includes a plurality of first sub-plates, the plurality of first sub-plates are arranged at intervals, and the first opening is formed between two adjacent first sub-plates. The first positioning portion of the first elastic member abuts against one of the second side surfaces. Or, along the third direction, the first opening penetrates part of the second side plate, and the third direction is a direction perpendicular to the bottom plate; the second side plate includes a plurality of first sub-plates and a second sub-plate, the plurality of first sub-plates are arranged at intervals, and a second sub-plate is provided between two adjacent first sub-plates, and the first opening is formed between two adjacent first sub-plates and the second sub-plate. The first positioning portion of the first elastic member abuts against one of the second side surfaces.

[0014] In some embodiments, the opening includes a second opening, and the elastic member includes a second elastic member located at the second opening. At the corners of two adjacent second side panels, along a third direction, two adjacent second side panels are recessed to form the second opening, and the third direction is a direction perpendicular to the bottom panel. The first positioning portion of the second elastic member abuts against both adjacent two second side surfaces.

[0015] In some embodiments, the opening includes a third opening, and the elastic member includes a third elastic member located at the third opening. At the corners of the adjacent first side panels and the second side panels, along the third direction, the adjacent first side panels and the second side panels are recessed to form the third opening. The first positioning portion of the third elastic member abuts against one of the second side surfaces.

[0016] In some embodiments, the light bar includes a substrate and a light source, and the light source is disposed between the substrate and the first side surface. The third elastic member also includes a second positioning portion, and the second positioning portion is disposed on a side of the support portion away from the bottom plate. The second positioning portion abuts against the substrate and the first side surface.

[0017] In some embodiments, the orthographic projection of the light guide plate on the bottom plate is a rectangle, the first positioning portion of the second elastic member includes a first sub-portion and a second sub-portion connected to each other, and along the first direction, the second sub-portion is located at one side of the light guide plate. Along the second direction, the first sub-portion is located at one side of the light guide plate. The second direction is perpendicular to the first side surface, and the first direction is perpendicular to the second direction and parallel to the bottom plate.

[0018] The thickness of the first sub-portion and the thickness of the second positioning portion of the third elastic member satisfy the following formula:

[0019] TD ×H D ≤Gap LGP～LED ;

[0020] T U ×H U +T D ×H D ≥k1W+b1;

[0021] T U is the thickness of the first sub-section, T D is the thickness of the second positioning portion of the third elastic member, H U is the hardness of the first sub-section, H D is the hardness of the second positioning portion of the third elastic member, Gap LGP～LED is the distance between the light guide plate and the light source, W is the width of the light guide plate in the second direction; k1 is 0.002-0.004; b1 is 0.16-1.32.

[0022] In some embodiments, the orthographic projection of the light guide plate on the bottom plate is a rectangle, the first positioning portion of the second elastic member includes a first sub-portion and a second sub-portion connected to each other, and along the first direction, the second sub-portion is located at one side of the light guide plate. Along the second direction, the first sub-portion is located at one side of the light guide plate. The second direction is perpendicular to the first side surface, and the first direction is perpendicular to the second direction and parallel to the bottom plate.

[0023] The thickness of the second sub-portion and the thickness of the first positioning portion of the third elastic member satisfy the following formula:

[0024] T R =k2L+b2;

[0025] Among them, T R is the thickness of the second sub-portion or the thickness of the first positioning portion of the third elastic member, L is the length of the light guide plate in the first direction, k2 is 0.001 to 0.01; b2 is -1.2 to 0.7.

[0026] In some embodiments, a thickness of the first positioning portion is greater than a thickness of the side plate.

[0027] In some embodiments, at least a portion of the support portion is offset from the opening, and a portion of the support portion that is offset from the opening abuts against the side plate.

[0028] In some embodiments, the backlight module further includes a middle frame, and the middle frame is arranged around the circumference of the light guide plate. A groove is provided on a side of the middle frame close to the bottom plate, and an end of the side plate away from the bottom plate is engaged with the groove. The elastic member further includes a clamping portion, and the clamping portion is arranged on a side of the first positioning portion away from the supporting portion, and the clamping portion is engaged with the groove.

[0029] In some embodiments, the thickness of the clamping portion is equal to the thickness of the side panel.

[0030] In some embodiments, the opening includes a second opening, and the elastic member includes a second elastic member located at the second opening. At the corners of two adjacent second side panels, along a third direction, two adjacent second side panels are recessed to form the second opening, and the third direction is a direction perpendicular to the bottom plate. The first positioning portion of the second elastic member abuts against two adjacent second side surfaces. The second elastic member includes two clamping portions, which are arranged at intervals, and the two clamping portions are respectively opposite to two adjacent second side surfaces.

[0031] In another aspect, a display module is provided, comprising the backlight module and a display panel as described in any one of the above embodiments, wherein the display panel is arranged on a side of a light guide plate away from a bottom plate.

[0032] In some embodiments, the backlight module includes a middle frame, and the middle frame is arranged around the circumference of the light guide plate. The display module also includes a first elastic support member, a touch layer and an optical adhesive, the first elastic support member is arranged between the middle frame and the display panel, the touch layer is arranged on a side of the display panel away from the backlight module, and the optical adhesive is arranged on the touch layer and the display panel.

[0033] In some embodiments, the light guide plate includes a first side surface and a second side surface, the side panel includes a first side panel and a second side panel, the light bar is located between the first side panel and the first side surface, and each second side panel is arranged opposite to one of the second side surfaces.

[0034] The middle frame includes a first frame and a second frame, and the first frame abuts against the first side panel. Along the direction from the first side panel to the first side, the distance between the first frame and the touch layer on the side away from the bottom plate decreases successively to form a plurality of steps. Among the plurality of steps, the step with the largest distance from the touch layer is the first step, and the first elastic support member is arranged on the side of the first step away from the bottom plate. Among the plurality of steps, the step with the smallest distance from the touch layer is the second step, and the second step is staggered with the display panel and at least partially opposite to the touch layer. The second frame abuts against the second side panel. Along the direction from the second side panel to the opposite second side, the distance between the second frame and the touch layer on the side away from the bottom plate is equal.

[0035] In some embodiments, the distance between the second step away from the surface of the bottom plate and the surface of the display panel away from the bottom plate satisfies the following formula:

[0036] H+T O ≥T S ×ρ P ;

[0037] Wherein, H is the distance between the surface of the second step away from the bottom plate and the surface of the display panel away from the bottom plate, T O is the thickness of the optical adhesive, T S is the thickness of the first elastic support member, P1 is the preset pressure, ρ P is the compression ratio of the first elastic support member under the preset pressure, M is the weight of the component borne by the first elastic support member, S is the contact area between the first elastic support member and the display panel, and P2 is the pressure applied by the bonding process between the display panel and the first elastic support member.

[0038] In another aspect, a display device is provided, wherein the display device comprises the display module as described in any one of the above embodiments.

[0039] The above-mentioned display device and display module have the same structure and beneficial technical effects as the backlight modules provided in some of the above-mentioned embodiments, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required to be used in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual size of the product involved in the embodiments of the present disclosure, the actual process of the method, the actual timing of the signal, etc.

[0041] Figure 1 is a structural diagram of a display device according to some embodiments;

[0042] Figure 2 for Figure 1 A sectional view along the section line AA';

[0043] Figure 3 is a top view of a display module according to some embodiments;

[0044] Figure 4 for Figure 3 A sectional view along section line BB';

[0045] Figure 5 for Figure 3 A sectional view along section line CC';

[0046] Figure 6 is a structural diagram of a light guide plate according to some embodiments;

[0047] Fig. 7A A partial enlarged view of the assembly of the back plate and the first elastic member of the backlight module according to some embodiments;

[0048] Figure 7B is a partial enlarged view of an opening of a back plate of a backlight module according to some embodiments;

[0049] Figure 7C is a partial enlarged view of another back plate of a backlight module at an opening according to some embodiments;

[0050] Figure 8 A partial enlarged view of the assembly of a back plate, a first elastic member and a light guide plate of a backlight module according to some embodiments;

[0051] Fig. 9 is a partial enlarged view of the assembly of the back plate of the backlight module and the second elastic member according to some embodiments;

[0052] Fig.10 A partial enlarged view of the assembly of a back plate, a second elastic member and a light guide plate of a backlight module according to some embodiments;

[0053] Fig.11 for Fig.10 A top view of the backlight module shown;

[0054] Fig.12 A partial enlarged view of the assembly of a back plate, a third elastic member and a light guide plate of a backlight module according to some embodiments;

[0055] Fig.13 Another partial enlarged view of the assembly of the back plate, the third elastic member and the light guide plate of the backlight module according to some embodiments;

[0056] Fig.14 for Fig.12 A top view of the backlight module is shown. DETAILED DESCRIPTION

[0057] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.

[0058] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms thereof, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open, inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0059] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0060] When describing some embodiments, the expression "connection" and its derivatives may be used. The term "connection" should be understood in a broad sense. For example, "connection" can be a mechanical connection or an electrical connection; it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0061] “At least one of A, B, and C” has the same meaning as “at least one of A, B, or C” and both include the following combinations of A, B, and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B, and C.

[0062] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0063] The use of "adapted to" or "configured to" herein is meant to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0064] As used herein, "vertical" includes the conditions described and conditions similar to the conditions described, the range of which is within an acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "vertical" includes absolute vertical and approximate vertical, wherein the acceptable deviation range of approximate vertical can also be, for example, within 5° of deviation.

[0065] It will be understood that when a layer or an element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present between the layer or element and the other layer or substrate.

[0066] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of the layers and the area of ​​the regions are exaggerated for clarity. Therefore, variations in the shapes relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shapes of the regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0067] like Figure 1 As shown, some embodiments of the present disclosure provide a display device 1000 , which may be any device that displays anything, whether in motion (eg, video) or fixed (eg, still image), and whether in text or image.

[0068] For example, see Figure 1 The display device 1000 may be any product or component with a display function, such as a television, a laptop computer, a tablet computer, a mobile phone, a personal digital assistant (PDA), a navigator, a vehicle display, a flight display, a wearable device, a virtual reality (VR) device, a sign, an electronic billboard, a shopping mall display, and a medical display. For example, the display device 1000 may be Figure 1 Medical display shown.

[0069] From the perspective of the shape of the display device 1000, the display device 1000 may be rectangular, circular, or elliptical, etc., which is not specifically limited in the embodiments of the present disclosure. The rectangle here includes not only a standard rectangle but also a rounded rectangle.

[0070] Some embodiments of the present disclosure are schematically described below by taking a rectangular display device 1000 as an example, but the implementation of the present disclosure is not limited thereto, and any other display device 1000 may also be considered as long as the same technical concept is applied.

[0071] In some embodiments, see Figure 2 The display device 1000 includes a display module 100 and a housing 200, wherein the display module 100 is disposed in the housing 200. The housing 200 may include a frame 210, wherein the longitudinal section of the frame 210 is, for example, U-shaped, and the display module 100 may be disposed in the frame 210. In addition, the housing 200 may also include a front frame ( Figure 2 The front frame is connected to the frame 210, and the display module 100 is disposed in a space enclosed by the front frame and the frame 210.

[0072] For example, Figure 2 As shown, the housing 200 only includes a frame 210 , that is, the display device 1000 does not include a front frame. The width of the frame of the display device 1000 does not need to consider the thickness of the front frame, which is conducive to a narrow frame design of the display device 1000 , but the embodiments of the present disclosure are not limited thereto.

[0073] Please continue reading Figure 2The display module 100 includes a display panel 10 and a cover plate 20. The display panel 10 may include a display side 10A and a non-display side 10B that are arranged opposite to each other. The display side 10A refers to the side of the display panel 10 that displays the image, and the non-display side 10B refers to the other side opposite to the display side 10A. The display panel 10 is arranged in the frame 210, and the cover plate 20 is arranged on the display side 10A of the display panel 10 and is located at the opening of the frame 210.

[0074] Please continue reading Figure 2 The display module 100 may further include a backlight module 30 and a driving circuit board 40. The backlight module 30 is disposed on the non-display side 10B of the display panel 10 and is used to provide a light source for the display panel 10. The display panel 10 may adjust the amount of light passing through the display panel 10, thereby displaying different grayscales to achieve the purpose of image display.

[0075] In addition, the driving circuit board 40 is disposed on a side of the backlight module 30 away from the display panel 10, and the driving circuit board 40 is connected to the display panel 10 and is used to transmit a control signal to the display panel 10 to drive the display panel 10 to display an image. Figure 4 ) is connected to the display panel 10. The driving circuit board 40 may include, for example, a timing controller (TCON), a power management chip (DC / DC), an adjustable resistor divider circuit (generating Vcom), and other driving circuits. Of course, the driving circuit board 40 may also include other circuit structures, which are not listed here one by one.

[0076] Please continue reading Figure 2 The display panel 10 may include an array substrate 11 and a color filter substrate 12 that are arranged opposite to each other, and a liquid crystal layer 13 that is arranged between the array substrate 11 and the color filter substrate 12. The array substrate 11 and the color filter substrate 12 are joined together by a sealant 14, so that the liquid crystal layer 13 is confined within the area surrounded by the sealant 14. The color filter substrate 12 may also be referred to as an opposing substrate or a packaging substrate. The color filter substrate 12 may filter the light incident on the color filter substrate 12 to emit light of multiple colors (such as red, green or blue) to achieve color display.

[0077] In addition, see Figure 3 The display panel 10 includes a display area AA and a peripheral area BB located at least on one side of the display area AA. Figure 3 In the example, the peripheral area BB surrounds the display area AA. The display area AA is a region for displaying images and is configured to set a plurality of sub-pixels P. The sub-pixel P can be understood as the smallest light-emitting unit in the display panel 10. The peripheral area B can be provided with a circuit structure.

[0078] Please continue reading Figure 3 , the display area AA may include a plurality of sub-pixels P, and the plurality of sub-pixels P may be arranged in a plurality of rows and columns in the display area AA, for example, one column includes at least two sub-pixels P arranged along a first direction X, and one row includes at least two sub-pixels P arranged along a second direction Y. The first direction X intersects the second direction Y, for example, the first direction X is perpendicular to the second direction Y.

[0079] In some embodiments, see Figure 4 The backlight module 30 includes a light bar 310 and a light guide plate 320. The light guide plate 320 is disposed on the non-display side 10B of the display panel 10 and is opposite to the display panel 10. The light guide plate 320 may be a flat plate or a wedge-shaped plate. Figure 4 In the figure, the light guide plate 320 is a flat plate, and the embodiment of the present disclosure is not limited thereto. The material of the light guide plate 320 may include styrene-methyl methacrylate, and the embodiment of the present disclosure is not limited thereto.

[0080] In addition, the light bar 310 can be arranged on the peripheral side of the light guide plate 320, that is, the light emitting side of the light bar 310 is opposite to the side surface 321 of the light guide plate 320. In this way, there is no need to arrange the light bar 310 in the thickness direction of the display device 1000, which is conducive to reducing the thickness of the display device 1000. However, the embodiments of the present disclosure are not limited to this.

[0081] For example, Figure 3 and Figure 4 As shown, the light bar 310 is disposed on one side of the light guide plate 320 along the second direction Y. Of course, the light bar 310 can also be disposed on two opposite sides of the light guide plate 320 along the second direction Y, and / or, along the first direction X, the light bar 310 is disposed on at least one side of the light guide plate 320.

[0082] In the following, along the second direction Y, the light bar 310 is disposed on one side of the light guide plate 320 ( Figure 3 Taking the lower side in the figure as an example, some embodiments of the present disclosure are schematically illustrated, but the implementation methods of the present disclosure are not limited to this.

[0083] Please continue reading Figure 4 The light bar 310 may include, for example, a substrate 311 and a light source 312, wherein the light source 312 is disposed on the substrate 311 and a side surface 321 of the light guide plate 320 (see Figure 6 ). The light source 312 may be, for example, a light emitting diode (LED). In addition, the backlight module 30 may further include a reflective sheet 330, which is disposed on a side of the light guide plate 320 away from the display panel 10 to reflect light emitted from the surface of the light guide plate 320 away from the display panel 10, thereby increasing light extraction efficiency.

[0084] Please continue reading Figure 4 The backlight module 30 further includes a back plate 340, which includes a bottom plate 341 and a side plate 342. The side plate 342 is disposed on one side of the bottom plate 341 and is disposed around the circumference of the bottom plate 341 to form an assembly space S. The light guide plate 320 and the light bar 310 are disposed in the assembly space S, and the side 321 of the light guide plate 320 (see Figure 6 ) is arranged opposite to the side plate 342. In addition, the backlight module 30 may further include an adhesive layer 313, and the light bar 310 is connected to the side plate 342 through the adhesive layer 313.

[0085] Combination Figure 4 and Figure 5 The backlight module 30 may further include a middle frame 350 and an optical film 360. The optical film 360 is disposed between the light guide plate 320 and the display panel 10. The middle frame 350 is disposed around the circumference of the light guide plate 320, and is partially located between the optical film 360 and the display panel 10, so as to position and fix the light guide plate 320 and the optical film 360, and to enable the display panel 10 and the optical film 360 to have a preset light mixing distance. The optical film 360 may include, for example, a diffuser and / or a brightness enhancement film. The brightness enhancement film may include, for example, a prismatic film (Brightness Enhancement Film, referred to as BEF) and a reflective polarized brightness enhancement film (Dual Brightness Enhancement Film, referred to as DBEF), and the two may be used in combination.

[0086] For example, Figure 4 and Figure 5 As shown, the backlight module 30 may further include a first elastic support member 371, which is disposed between the middle frame 350 and the display panel 10 to support the display panel 10 and provide a light mixing distance. Figure 4 As shown, the backlight module 30 may further include a second elastic support member 372, which is disposed between the middle frame 350 and the optical film 360 and is located on the side of the light guide plate 320 close to the light bar 310, so as to position and fix the optical film 360 and the light guide plate 320, and reduce the risk of light explosion caused by the deviation of the light source 312 and the light guide plate 320. In addition, the first elastic support member 371 and the second elastic support member 372 may both include black foam, which has a good buffering and shock absorbing effect, and can reduce the risk of light leakage from the peripheral side of the display device 1000.

[0087] In some embodiments, see Figure 7A to Figure 14The backlight module 30 also includes an elastic member 380, which includes a supporting portion 381 and a first positioning portion 382. The first positioning portion 382 is arranged on a side of the supporting portion 381 away from the bottom plate 341, and the supporting portion 381 and the first positioning portion 382 are connected. For example, the first positioning portion 382 is integrally formed with the supporting portion 381.

[0088] Among them, combined Fig. 7A , Figure 7B , Figure 7C and Figure 8 , the support portion 381 is disposed between the light guide plate 320 and the bottom plate 341 to provide support for the light guide plate 320. The side plate 342 is provided with an opening H, and the first positioning portion 382 is located at the opening H, which is convenient for the installation of the elastic member 380. Moreover, the orthographic projection of the first positioning portion 382 on the reference plane is located within the range of the orthographic projection of the opening H on the reference plane. The reference plane is the side surface 321 of the light guide plate 320 opposite to the first positioning portion 382. That is, the end surface of the first positioning portion 382 does not exceed the end surface of the opening H, that is, the first positioning portion 382 is not located between the side plate 342 and the side surface 321 of the light guide plate 320.

[0089] In addition, at least a portion of the support portion 381 may be staggered with the opening H, and the portion of the support portion 381 staggered with the opening H abuts against the side plate 342. In this way, the position of the elastic member 380 can be limited by the cooperation between the support portion 381, the side plate 342 and the light guide plate 320, and the structural stability is better. Fig. 7A , Figure 7B and Figure 7C In the orthographic projection onto the bottom plate 341, the length of the opening H is less than the length of the support portion 381, so that the portion of the support portion 381 that exceeds the opening H can abut against the side plate 342, and the structure is simple. Of course, the elastic member 380 and the back plate 340 can also be connected and fixed by bonding. It should be noted that, in the orthographic projection onto the bottom plate 341, the length of the first positioning portion 382 refers to the length of the first positioning portion 382 in the extending direction of the side plate 342, and the length of the opening H refers to the length of the opening H in the extending direction of the side plate 342.

[0090] On this basis, if Fig. 7A , Figure 7B , Figure 7C and Figure 8As shown, the first positioning portion 382 abuts against the light guide plate 320 to position the light guide plate 320. In the fourth direction Z2, the thickness of the first positioning portion 382 is greater than the thickness of the side plate 342, and the surface of the light guide plate 320 abutted against the first positioning portion 382 in the fourth direction Z2 is perpendicular. In this way, the first positioning portion 382 abuts against the light guide plate 320, so that a gap can be left between the light guide plate 320 and the side plate 342, and the structure is simple. At this time, after the light guide plate 320 is deformed by thermal expansion, the first positioning portion 382 can be elastically deformed under the extrusion of the light guide plate 320, providing expansion space for the light guide plate 320, thereby avoiding the problem of reduced light output effect caused by the light guide plate 320 being arched or sunken due to thermal expansion.

[0091] In addition, the first positioning portion 382 and the light bar 310 are located on different sides of the light guide plate 320 to avoid interference between the first positioning portion 382 and the light bar 310 .

[0092] In this case, since the first positioning portion 382 is not located between the side plate 342 and the side surface 321 of the light guide plate 320, the frame width of the display device 1000 can be reduced by the thickness of the side plate 342. The frame width of the display device 1000 satisfies the following formula:

[0093] W LCM ≥T0+D LGP～AA +T MF +T b +Gap Total .

[0094] Among them, W LCM is the frame width of the display device 1000, T0 is the thickness of the first positioning portion 382 in the fourth direction Z2, D LGP～AA is the distance between the boundary of the light guide plate 320 and the boundary of the display area AA, T MF is the thickness of the middle frame 350 in the fourth direction Z2, T b is the thickness of the front frame, Gap Total is the sum of the gaps between the various components in the fourth direction Z2. It should be noted that, when the display device 1000 does not include a front frame, T b That is 0.

[0095] Based on the above formula, it can be known that the frame width of the display device 1000 does not need to consider the thickness of the side plate 342. Therefore, the first positioning portion 382 is not located between the side plate 342 and the side surface 321 of the light guide plate 320, and the frame width of the display device 1000 can be reduced. For example, taking the display device 1000 as a rectangle, that is, the orthographic projection of the light guide plate 320 on the bottom plate 341 is a rectangle, and along the second direction Y, the light bar 310 is arranged on one side of the light guide plate 320, in the first direction X, T0 is 1.4 mm, DLGP～AA 2mm, T MF Gap is 0.7mm Total 0.2mm, W LCM It can reach 516.64mm.

[0096] It should be noted that T0 is the thickness of the first positioning portion 382 in the fourth direction Z2, which can be specifically designed according to the position and hardness of the first positioning portion 382 and the expansion amount of the light guide plate 320. For details, please refer to the following.

[0097] In addition, when the border width of the display device 1000 remains unchanged, the thermal expansion of the light guide plate 320 can be increased, and the temperature of the reliability test can be designed to be higher. At this time, the highest temperature that the light guide plate 320 can withstand can be, for example, a first preset temperature, and the first preset temperature is, for example, the temperature of the reliability test. The lowest temperature that the light guide plate 320 can withstand can be, for example, a second preset temperature, and the second preset temperature can be, for example, a preset room temperature, which is, for example, the temperature of a production workshop. Taking the display device 1000 as a rectangle, that is, the orthographic projection of the light guide plate 320 on the bottom plate 341 is a rectangle, and along the second direction Y, the light bar 310 is arranged on one side of the light guide plate 320, as an example, the temperature difference between the first preset temperature and the second preset temperature satisfies the following formula:

[0098]

[0099] Wherein, ΔT is the temperature difference between the first preset temperature and the second preset temperature, T BC is the thickness of the back plate 340, H L is the hardness of the portion of the elastic member 380 located on one side of the first direction X of the light guide plate 320 (such as the first positioning portion 382), LGP is the length of the light guide plate 320 in the first direction X, W LGP is the width of the light guide plate 320 in the second direction Y, ε is the expansion coefficient of the light guide plate 320, T D H is the thickness of the portion of the elastic member 380 located between the light guide plate 320 and the light bar 310 (such as the second positioning portion 382 of the third elastic member 3830 mentioned below), U H is the hardness of the portion of the elastic member 380 located on the side of the light guide plate 320 away from the light bar 310 in the second direction Y (such as the first sub-portion 3821 mentioned below), D is the hardness of the portion of the elastic member 380 located between the light guide plate 320 and the light bar 310 (such as the second positioning portion 382 of the third elastic member 3830 mentioned below).

[0100] In some embodiments, see Fig. 7A , Figure 7B and Figure 7C, in the orthographic projection onto the bottom plate 341, the length of the opening H is greater than or equal to the length of the first positioning portion 382. For example, in the orthographic projection onto the bottom plate 341, the length of the opening H is equal to the length of the first positioning portion 382, ​​that is, the boundary of the orthographic projection of the opening H on the opposite side 321 (reference surface) coincides with the boundary of the orthographic projection of the corresponding first positioning portion 382 (the first positioning portion 382 located at the opening H) on the opposite side 321, so that the end face of the first positioning portion 382 fits the end face of the side plate 342 at the opening H, which can reduce the risk of light leakage. Of course, there can also be a gap between the end face of the first positioning portion 382 and the end face of the side plate 342 at the opening H. It should be noted that, in the orthographic projection onto the bottom plate 341, the length of the first positioning portion 382 refers to the length of the first positioning portion 382 in the extending direction of the side plate 342, and the length of the opening H refers to the length of the opening H in the extending direction of the side plate 342.

[0101] In some embodiments, see Figure 4 and Figure 6 The side surface 321 includes a first side surface 321A and a second side surface 321B, the side plate 342 includes a first side plate 342A and a second side plate 342B, the light bar 310 is located between the first side plate 342A and the first side surface 321A, and each second side plate 342B is disposed opposite to a second side surface 321B. Figure 7A to Figure 14 Each second side plate 342B is provided with an opening H, so that an elastic member 380 abuts against any second side surface 321B of the light guide plate 320 to provide good support and positioning and fixing effects for the light guide plate 320 .

[0102] For example, when the orthographic projection of the light guide plate 320 on the base plate 341 is a rectangle, the side 321 of the light guide plate 320 may include a first side 321A and three second side 321B, and the side panel 342 may include a first side panel 342A and three second side panels 342B. Of course, the embodiments of the present disclosure are not limited to this.

[0103] In the following, some embodiments of the present disclosure are exemplarily described by taking the case where the side surface 321 of the light guide plate 320 includes a first side surface 321A and three second side surfaces 321B, and the side panel 342 includes a first side panel 342A and three second side panels 342B as an example, but the implementation of the present disclosure is not limited thereto.

[0104] In some embodiments, Fig. 7A , Figure 7B , Figure 7C and Figure 8As shown, the opening H includes a first opening H1, and the elastic member 380 includes a first elastic member 3810 located at the first opening H1. The second side plate 342B includes a plurality of first sub-plates 3421, and the plurality of first sub-plates 3421 are arranged at intervals, and a first opening H1 is formed between two adjacent first sub-plates 3421. The first positioning portion 382 of the first elastic member 3810 abuts against a second side surface 321B. At this time, along the third direction Z1, the first opening H1 can be formed by, for example, a depression of the second side plate 342B, and the third direction Z1 is a direction perpendicular to the bottom plate 341. The first opening H1 can completely penetrate the second side plate 342B, or can penetrate part of the second side plate 342B.

[0105] For example, Fig. 7A and Figure 7B As shown, along the third direction Z1, the first opening H1 penetrates the second side plate 342B, and the first opening H1 is formed between two adjacent first sub-plates 3421 and the bottom plate 341. Fig. 7A and Figure 7C As shown, along the third direction Z1, the first opening H1 penetrates part of the second side plate 342B, and the second side plate 342B also includes a second sub-plate 3422. A second sub-plate 3422 is provided between two adjacent first sub-plates 3421, and a first opening H1 is formed between the two adjacent first sub-plates 3421 and the second sub-plate 3422.

[0106] The orthographic projection of the first positioning portion 382 of the above-mentioned first elastic member 3810 on the relative side surface 321 is located within the range of the orthographic projection of the opening H on the relative side surface 321, that is, the orthographic projection of the first positioning portion 382 of the first elastic member 3810 on the relative second side surface 321B is located within the range of the orthographic projection of the first opening H1 on the relative second side surface 321B.

[0107] In this case, the first elastic member 3810 is arranged on one side of the second side surface 321B of the light guide plate 320, and the first positioning portion 382 of the first elastic member 3810 can only abut against one second side surface 321B of the light guide plate 320, so that the light guide plate 320 can expand in the direction close to the first elastic member 3810, and the structure of the first elastic member 3810 is relatively simple and easy to prepare.

[0108] It should be noted that one side of each second side surface 321B of the light guide plate 320 may be provided with one or more first elastic members 3810 , and the number of the first elastic members 3810 may be set according to actual conditions.

[0109] In some embodiments, Fig. 9 , Fig.10 and Fig.11As shown, the opening H includes a second opening H2, and the elastic member 380 includes a second elastic member 3820 located at the second opening H2. At the corners of two adjacent second side plates 342B, along the third direction Z1, the two adjacent second side plates 342B are recessed to form the second opening H2. The first positioning portion 382 of the second elastic member 3820 abuts against both of the two adjacent second side surfaces 321B. At this time, along the third direction Z1, the second opening H2 can completely penetrate the second side plate 342B, or can penetrate part of the second side plate 342B.

[0110] The second opening H2 includes a first sub-opening H21 and a second sub-opening H22 that are connected to each other. The first sub-opening H21 and the second sub-opening H22 are respectively arranged opposite to the two adjacent second side surfaces 321B. The second elastic member 3820 includes a first sub-elastic member 3820A and a second sub-elastic member 3820B that are connected to each other. The first positioning portion 382 of the first sub-elastic member 3820A and the first positioning portion 382 of the second sub-elastic member 3820B are respectively in contact with the two adjacent second side surfaces 321B.

[0111] At this time, the orthographic projection of the first positioning portion 382 of the above-mentioned second elastic member 3820 on the relative second side surface 321B is located within the range of the orthographic projection of the first opening H1 on the relative second side surface 321B, that is, the orthographic projection of the first positioning portion 382 of the first sub-elastic member 3820A on the relative second side surface 321B is located within the range of the orthographic projection of the first sub-opening H21 on the relative second side surface 321B, and the orthographic projection of the first positioning portion 382 of the second sub-elastic member 3820B on the relative second side surface 321B is located within the range of the orthographic projection of the second sub-opening H22 on the relative second side surface 321B.

[0112] In this case, the second elastic member 3820 is disposed at the corner of the light guide plate 320 away from the light bar 310, and the first positioning portion 382 of the second elastic member 3820 can abut against the two second side surfaces 321B of the light guide plate 320, so that the two second side surfaces 321B of the light guide plate 320 can expand toward the direction close to the second elastic member 3820, and when fewer second elastic members 3820 are used, all the second side surfaces 321B of the light guide plate 320 can be abutted to provide a better positioning and fixing effect. In addition, the second elastic member 3820 is located at the second opening H2, that is, the second elastic member 3820 is located at the corner of two adjacent second side panels 342B, and the two second side panels 342B are limited to facilitate the installation and fixing of the second elastic member 3820.

[0113] In some embodiments, Fig.12 , Fig.13 and Fig.14As shown, the opening H includes a third opening H3, and the elastic member 380 includes a third elastic member 3830 located at the third opening H3. At the corner of the adjacent first side plate 342A and the second side plate 342B, along the third direction Z1, the adjacent first side plate 342A and the second side plate 342B are recessed to form the third opening H3, and the first positioning portion 382 of the third elastic member 3830 abuts against a second side surface 321B. At this time, along the third direction Z1, the third opening H3 can completely penetrate the second side plate 342B, or can penetrate part of the second side plate 342B.

[0114] The orthographic projection of the first positioning portion 382 of the third elastic member 3830 on the relative side surface 321 is located within the range of the orthographic projection of the opening H on the relative side surface 321, that is, the orthographic projection of the first positioning portion 382 of the third elastic member 3830 on the relative second side surface 321B is located within the range of the orthographic projection of the third opening H3 on the relative second side surface 321B.

[0115] On this basis, the third elastic member 3830 further includes a second positioning portion 383, which is disposed on a side of the support portion 381 away from the bottom plate 341, and the support portion 381 is also connected to the second positioning portion 383, for example, the first positioning portion 382, ​​the second positioning portion 383 and the support portion 381 are integrally formed. The second positioning portion 383 abuts against the substrate 311 and the first side surface 321A.

[0116] In this case, the third elastic member 3830 is disposed at the corner of the light guide plate 320 close to the light bar 310, the first positioning portion 382 of the third elastic member 3830 can abut against a second side surface 321B of the light guide plate 320, and the second positioning portion 383 can abut against the first side surface 321A of the light guide plate 320, so that the light guide plate 320 can also expand in the direction close to the light bar 310, and by designing the maximum expansion and contraction amount of the second positioning portion 383, the expansion amount of the light guide plate 320 can be limited in the direction close to the light bar 310, avoiding the risk of the light guide plate 320 and the light source 312 being squeezed to produce a burst lamp. In addition, the third elastic member 3830 is located at the third opening H3, and can be limited by the light bar 310 and the second side plate 342B, which is conducive to the installation and fixation of the third elastic member 3830.

[0117] Any two or three of the first elastic member 3810, the second elastic member 3820 and the third elastic member 3830 can be combined in a suitable manner. For example, the orthographic projection of the light guide plate 320 on the bottom plate 341 is a rectangle, and the backlight module 30 includes two second elastic members 3820 and two third elastic members 3830, so that the display device 1000 corresponding to the frame without the light bar 310 can reduce the thickness of one side plate 342.

[0118] Below, taking the example that the positive projection of the light guide plate 320 on the base plate 341 is a rectangle, and the backlight module 30 includes two second elastic members 3820 and two third elastic members 3830, the thickness of the second elastic members 3820 and the third elastic members 3830 of some embodiments of the present disclosure are schematically explained, but the implementation methods of the present disclosure are not limited to this.

[0119] For example, see Fig. 9 , Fig.10 and Fig.11 The first positioning portion 382 of the second elastic member 3820 includes a first sub-portion 3821 and a second sub-portion 3822 connected to each other. The second sub-portion 3822 is located at one side of the light guide plate 320 along the first direction X. Along the second direction Y, the first sub-portion 3821 is located at one side of the light guide plate 320.

[0120] At this time, the thickness of the first sub-portion 3821 and the thickness of the second positioning portion 383 of the third elastic member 3830 satisfy the following formula:

[0121] T D ×H D ≤Gap LGP～LED .

[0122] T U ×H U +T D ×H D ≥k1W+b1;

[0123] The T U is the thickness of the first sub-section 3821, T D is the thickness of the second positioning portion 383 of the third elastic member 3830, H U is the hardness of the first sub-section 3821, H D is the hardness of the second positioning portion 383 of the third elastic member 3830, Gap LGP～LED is the distance between the light guide plate 320 and the light source 312 , and W is the width of the light guide plate 320 in the second direction Y.

[0124] Among them, k1 = ε × ΔT, b1 = σ-ω, that is, T U ×H U +T D ×H D ≥W×ε×ΔT+σ-ω. The k1 may be, for example, 0.002 to 0.004, and the b1 may be, for example, 0.16 mm to 1.32 mm.

[0125] ε is the expansion coefficient of the light guide plate 320, ΔT is the temperature difference between the first preset temperature and the second preset temperature, σ is the dimensional tolerance of the elastic member 380, and ω is the deformation amount of the back plate 340 generated when the temperature rises from the second preset temperature to the first preset temperature.D 0.85mm, H D 76HB, Gap LGP～LED T is 0.2mm. U 1.8mm, H U is 45HB, W is 325.7mm, and ε is 7.67×10 - 5 mm / ℃, ΔT is 35℃, σ is 0.32mm, and ω is 0.168mm.

[0126] At this time, the thickness of the second sub-portion 3822 and the thickness of the first positioning portion 382 of the third elastic member 3830 satisfy the following formula:

[0127] T R =k2L+b2.

[0128] The T R is the thickness of the second sub-portion 3822 or the thickness of the first positioning portion 382 of the third elastic member 3830 , and L is the length of the light guide plate 320 in the first direction X.

[0129] in, Right now, The k2 may be, for example, 0.001 to 0.01, and the b2 may be, for example, -1.2 mm to 0.7 mm.

[0130] The H R is the hardness of the second sub-portion 3822 or the hardness of the first positioning portion 382 of the third elastic member 3830, ε is the expansion coefficient of the light guide plate 320, ΔT is the temperature difference between the first preset temperature and the second preset temperature, σ is the dimensional tolerance of the elastic member 380, and ω is the deformation amount of the back plate 340 from the second preset temperature to the first preset temperature. For example, T R 1.4mm, H R is 50HB, L is 516.64mm, and ε is 7.67×10 -5 mm / ℃, ΔT is 35℃, σ is 0.32mm, and ω is 0.168mm.

[0131] In some embodiments, see Figure 4 and Figure 5 A groove is provided on one side of the middle frame 350 close to the bottom plate 341, and one end of the side plate 342 away from the bottom plate 341 is engaged with the groove to cooperate with fixing the middle frame 350. In addition, an elastic buckle 3420 may be provided on the side plate 342, and the elastic buckle 3420 may be formed by cutting and bending the side plate 342, and the middle frame 350 may be provided with a slot, and the elastic buckle 3420 is engaged with the slot to cooperate with fixing the middle frame 350.

[0132] On this basis, the elastic member 380 further includes a clamping portion 384, which is disposed on a side of the first positioning portion 382 away from the support portion 381, and the clamping portion 384 is connected to the first positioning portion 382, ​​for example, the clamping portion 384, the first positioning portion 382 and the support portion 381 are integrally formed. The clamping portion 384 is clamped with the groove, so that the structural stability of the middle frame 350 is increased by clamping the back plate 340 and the elastic member 380 at two locations. Here, the thickness of the clamping portion 384 can be equal to the thickness of the side plate 342, for example.

[0133] In addition, when the backlight module 30 includes the second elastic member 3820, the second elastic member 3820 includes two clamping parts 384, the two clamping parts 384 are arranged at intervals, and the two clamping parts 384 are respectively opposite to the two adjacent second side surfaces, so that the middle frame 350 can also form a limit through the area between the two clamping parts 384, further increasing the structural stability of the middle frame 350. The two clamping parts 384 are arranged at intervals, and the two clamping parts 384 are respectively opposite to the two adjacent second side surfaces, and the structure of the two clamping parts 384 is simple and easy to prepare. Of course, the two clamping parts 384 can also be directly connected.

[0134] In some embodiments, Figure 4 and Figure 5 As shown, the display module 100 may further include an optical glue 50 and a touch layer 60. The touch layer 60 is disposed on a side of the display panel 10 away from the backlight module 30, so that the display device 1000 can achieve human-computer interaction by touch. The optical glue 50 is disposed between the touch layer 60 and the display panel 10, so that the touch layer 60 and the display panel 10 are connected and fixed by bonding.

[0135] In some embodiments, see Figure 4 The middle frame 350 includes a first frame 351, and the first frame 351 abuts against the first side plate 342A. Along the direction from the first side plate 342A to the first side surface 321A, the distance between the first frame 351 and the touch layer 60 decreases successively, forming a plurality of steps ST.

[0136] The step ST with the largest distance from the touch layer 60 among the multiple steps ST is the first step ST1, and the first elastic support member 371 is disposed on a side of the first step ST1 away from the bottom plate 341. The step ST with the smallest distance from the touch layer 60 among the multiple steps ST is the second step ST2, and the second step ST2 is staggered with the display panel 10 and at least partially opposite to the touch layer 60.

[0137] In addition, see Figure 5The middle frame 350 may further include a second frame 352, which is in contact with the second side plate 342B. Along the direction from the second side plate 342B to the opposite second side surface 321B, the second frame 352 is away from the side of the bottom plate 341 and is equidistant from the touch layer 60.

[0138] On this basis, the distance between the surface of the second step ST2 away from the bottom plate 341 and the surface of the display panel 10 away from the bottom plate 341 satisfies the following formula:

[0139] H+T O ≥T S ×ρ P .

[0140]

[0141] Wherein, H is the distance between the surface of the second step ST2 away from the bottom plate 341 and the surface of the display panel 10 away from the bottom plate 341, T O is the thickness of the optical adhesive 50, T S is the thickness of the first elastic support member 371, P1 is the preset pressure, ρ P is the compression ratio of the first elastic support member 371 under a preset pressure, and M is the compression ratio of the first elastic support member 371 (eg Figure 4 The preset pressure P1 is the weight of the components carried by the first elastic support member 371 (all components on the upper side of the first elastic support member 371), S is the contact area between the first elastic support member 371 and the display panel 10, and P2 is the pressure applied by the bonding process between the display panel 10 and the first elastic support member 371. Here, the preset pressure P1 is the total pressure on the first elastic support member 371 during the bonding process.

[0142] At this time, during the bonding process between the display panel 10 equipped with the touch layer 60 and the first elastic support member 371, the compression amount of the first elastic support member 371 is less than the distance between the surface of the second step ST2 away from the bottom plate 341 and the touch layer 60, thereby avoiding the risk of damage to the touch layer 60 caused by the squeezing force between the second step ST2 and the touch layer 60.

[0143] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0144] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be thought of by any person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A backlight module, characterized in that: include: A back plate, comprising a bottom plate and a side plate, wherein the side plate is arranged on one side of the bottom plate and is arranged around the circumference of the bottom plate to form an assembly space; The side plate is provided with an opening; A light guide plate is arranged in the assembly space; the light guide plate includes a side surface arranged opposite to the side plate; A light bar, disposed between the light guide plate and the side plate, with the light emitting side of the light bar facing the side surface of the light guide plate; Elastic parts, including: A supporting portion, disposed between the light guide plate and the bottom plate; A first positioning portion is arranged on a side of the supporting portion away from the bottom plate; the first positioning portion is located at the opening, and an orthographic projection of the first positioning portion on a reference plane is located within the range of an orthographic projection of the opening on the reference plane; the reference plane is a side surface of the light guide plate opposite to the first positioning portion; the first positioning portion and the light bar are located on different sides of the light guide plate and abut against the light guide plate.

2. The backlight module according to claim 1, characterized in that: In an orthographic projection onto the base plate, the length of the opening is greater than or equal to the length of the first positioning portion; and / or the length of the opening is less than the length of the supporting portion.

3. The backlight module according to claim 1, characterized in that: The side surface includes a first side surface and a second side surface, the side panel includes a first side panel and a second side panel, the light bar is located between the first side panel and the first side surface, each of the second side panels is arranged opposite to one of the second side surfaces, and each of the second side panels is provided with the opening.

4. The backlight module according to claim 3, characterized in that: The opening includes a first opening, and the elastic member includes a first elastic member located at the first opening; The first opening penetrates the second side plate along a third direction, and the third direction is a direction perpendicular to the bottom plate; the second side plate includes a plurality of first sub-plates, the plurality of first sub-plates are arranged at intervals, and the first opening is formed between two adjacent first sub-plates; the first positioning portion of the first elastic member abuts against one of the second side surfaces; Or, along a third direction, the first opening partially penetrates the second side plate, and the third direction is a direction perpendicular to the bottom plate; the third direction is a direction perpendicular to the bottom plate; the second side plate includes a plurality of first sub-plates and a second sub-plate, the plurality of first sub-plates are arranged at intervals, and a second sub-plate is provided between two adjacent first sub-plates, and the first opening is formed between two adjacent first sub-plates and the second sub-plate; the first positioning portion of the first elastic member abuts against one of the second side surfaces.

5. The backlight module according to claim 3, characterized in that: The opening includes a second opening, and the elastic member includes a second elastic member located at the second opening; At the corners of two adjacent second side panels, along the third direction, the two adjacent second side panels are recessed to form the second opening, and the third direction is a direction perpendicular to the bottom plate; the first positioning portion of the second elastic member abuts against the two adjacent second side surfaces.

6. The backlight module according to claim 5, characterized in that: The opening includes a third opening, and the elastic member includes a third elastic member located in the third opening; At the corners of the adjacent first side plates and the second side plates, along the third direction, the adjacent first side plates and the second side plates are recessed to form the third opening; and the first positioning portion of the third elastic member abuts against one of the second side surfaces.

7. The backlight module according to claim 6, characterized in that: The light bar comprises a substrate and a light source, wherein the light source is arranged between the substrate and the first side surface; The third elastic member further comprises: The second positioning portion is arranged on a side of the supporting portion away from the bottom plate; the second positioning portion abuts against the base plate and the first side surface.

8. The backlight module according to claim 7, characterized in that: The orthographic projection of the light guide plate on the bottom plate is a rectangle, the first positioning portion of the second elastic member includes a first sub-portion and a second sub-portion connected to each other, along the first direction, the second sub-portion is located at one side of the light guide plate; along the second direction, the first sub-portion is located at one side of the light guide plate; the second direction is perpendicular to the first side surface, the first direction is perpendicular to the second direction, and is parallel to the bottom plate; The thickness of the first sub-portion and the thickness of the second positioning portion of the third elastic member satisfy the following formula: T D ×H D ≤Gap LGP～LED ; T U ×H U +T D ×H D ≥k1W+b1; T U is the thickness of the first sub-section, T D is the thickness of the second positioning portion of the third elastic member, H U is the hardness of the first sub-section, H D is the hardness of the second positioning portion of the third elastic member, Gap LGP～LED is the distance between the light guide plate and the light source, W is the width of the light guide plate in the second direction, k1 is 0.002-0.004, and b1 is 0.16 mm-1.32 mm.

9. The backlight module according to claim 7, characterized in that: The orthographic projection of the light guide plate on the bottom plate is a rectangle, the first positioning portion of the second elastic member includes a first sub-portion and a second sub-portion connected to each other, along the first direction, the second sub-portion is located at one side of the light guide plate; along the second direction, the first sub-portion is located at one side of the light guide plate; the second direction is perpendicular to the first side surface; the first direction is perpendicular to the second direction and parallel to the bottom plate; The thickness of the second sub-portion and the thickness of the first positioning portion of the third elastic member satisfy the following formula: T R =k2L+b2; Among them, T R is the thickness of the second sub-portion or the thickness of the first positioning portion of the third elastic member, L is the length of the light guide plate in the first direction, k2 is 0.001 to 0.01; b2 is -1.2 mm to 0.7 mm.

10. The backlight module according to claim 1, characterized in that: The thickness of the first positioning portion is greater than the thickness of the side plate.

11. The backlight module according to claim 1, characterized in that: At least a portion of the support portion is offset from the opening, and a portion of the support portion that is offset from the opening abuts against the side plate.

12. The backlight module according to any one of claims 1 to 11, characterized in that: Also includes: A middle frame is arranged circumferentially around the light guide plate; a groove is provided on a side of the middle frame close to the bottom plate, and an end of the side plate away from the bottom plate is clamped with the groove; the elastic member also includes a clamping portion, which is arranged on a side of the first positioning portion away from the supporting portion, and the clamping portion is clamped with the groove.

13. The backlight module according to claim 12, characterized in that: The thickness of the clamping portion is equal to the thickness of the side plate.

14. The backlight module according to claim 12, characterized in that: The opening includes a second opening, and the elastic member includes a second elastic member located at the second opening; at the corners of two adjacent second side plates, along a third direction, two adjacent second side plates are recessed to form the second opening, and the third direction is a direction perpendicular to the bottom plate; the first positioning portion of the second elastic member abuts against two adjacent second side surfaces; The second elastic member includes two clamping portions, the two clamping portions are arranged at an interval, and the two clamping portions are respectively opposite to two adjacent second side surfaces.

15. A display module, characterized in that: include: The backlight module according to any one of claims 1 to 14; The display panel is arranged on a side of the light guide plate away from the bottom plate.

16. The display module according to claim 15, characterized in that: The backlight module includes a middle frame, and the middle frame is arranged around the circumference of the light guide plate; the display module also includes: A first elastic support member is disposed between the middle frame and the display panel; A touch layer, arranged on a side of the display panel away from the backlight module; Optical adhesive is arranged on the touch layer and the display panel.

17. The display module according to claim 16, characterized in that: The light guide plate includes a first side surface and a second side surface, the side plate includes a first side plate and a second side plate, the light bar is located between the first side plate and the first side surface, and each of the second side plates is arranged opposite to one of the second side surfaces; The middle frame includes: a first frame abutting against the first side plate; along the direction from the first side plate to the first side surface, the first frame is away from the bottom plate, and the distance between the first frame and the touch layer decreases in sequence, forming a plurality of steps; the step with the largest distance from the touch layer among the plurality of steps is the first step, and the first elastic support member is arranged on the side of the first step away from the bottom plate; the step with the smallest distance from the touch layer among the plurality of steps is the second step, and the second step is staggered with the display panel and at least partially opposite to the touch layer; The second frame is in contact with the second side plate; along the direction of the second side plate pointing to the second side surface opposite to the second side plate, the second frame is at an equal distance from the touch layer at a side away from the bottom plate.

18. The display module according to claim 17, characterized in that: The distance between the second step away from the surface of the bottom plate and the surface of the display panel away from the bottom plate satisfies the following formula: H+T O ≥T S ×ρ P ; Wherein, H is the distance between the surface of the second step away from the bottom plate and the surface of the display panel away from the bottom plate, T O is the thickness of the optical adhesive, T S is the thickness of the first elastic support member, P1 is the preset pressure, ρ P is the compression ratio of the first elastic support member under the preset pressure, M is the weight of the component borne by the first elastic support member, S is the contact area between the first elastic support member and the display panel, and P2 is the pressure applied by the bonding process between the display panel and the first elastic support member.

19. A display device, characterized in that: include: The display module according to any one of claims 15 to 18.

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