Backlight module and display device

Abstract

The invention provides a backlight module which comprises a back plate, the back plate comprises a bottom plate and a side plate connected to the edge of the bottom plate, and the side plate and the bottom plate are connected to form a containing space; the accommodating space comprises an accommodating part and at least one limiting groove; the light guide plate is arranged on the bottom plate; the light guide plate comprises a main body structure and at least one protruding structure connected with the main body structure. The main structure is located in the containing part. The protruding structure is located in the limiting groove. Wherein the side plates comprise a first side plate for limiting a limiting groove; a first fixing assembly is arranged between the first side plate and the protruding structure and used for relatively fixing the back plate and the light guide plate. According to the backlight module, light gathering does not exist, bright spots do not exist under the large viewing angle, the picture is single, the high picture uniformity is achieved, meanwhile, light leakage on the back face can be completely eradicated, and the displayed picture quality is good.

Description

Technical Field

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

[0002] In recent years, with the continuous development of display technology, the application scope of display devices has been continuously expanded, such as smart phones, smart bracelets, smart TVs, car displays, etc. And with the hot automobile market, the demand for large-screen central control and instrument panels is increasing to meet people's needs for cars. Nowadays, car touch displays are gradually moving towards large screens, high definition, narrow frames, special shapes and other forms. The traditional way of fixing car light guide plates can no longer meet the needs. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art, and provides a backlight module, comprising:

[0004] A back plate, the back plate comprising a bottom plate and a side plate connected to an edge of the bottom plate, the side plate being connected to the bottom plate to form a receiving space; the receiving space comprising a receiving portion and at least one limiting groove;

[0005] A light guide plate is arranged on the bottom plate; the light guide plate comprises a main structure and at least one protruding structure connected to the main structure; the main structure is located in the accommodating portion, and the protruding structure is located in the limiting groove;

[0006] Wherein, the side plate includes a first side plate for defining the limiting groove; a first fixing component is arranged between the first side plate and the protruding structure, for fixing the back plate and the light guide plate relative to each other.

[0007] In some embodiments, the first side panel includes a first sub-panel and a second sub-panel and a third sub-panel respectively connected to two ends of the first sub-panel;

[0008] The first fixing assembly includes a first fixing member and a second fixing member that are disconnected; the first fixing member is arranged between the first sub-board, the second sub-board and the protruding structure; the second fixing member is arranged between the first sub-board, the third sub-board and the protruding structure.

[0009] In some embodiments, the first fixing member and the second fixing member each include a first fixing portion and a second fixing portion connected;

[0010] The first fixing parts of the first fixing member and the second fixing member are both arranged between the first sub-board and the protruding structure; the second fixing part of the first fixing member is arranged between the second sub-board and the protruding structure, and the second fixing part of the second fixing member is arranged between the third sub-board and the protruding structure;

[0011] Wherein, the first fixing member and the second fixing member both further include a recessed portion arranged at the connection between the first fixing portion and the second fixing portion, and the recessed portion is located on a side of the first fixing portion close to the protruding structure.

[0012] In some embodiments, the backlight module also includes a light bar; the light bar is arranged on the inner wall of the first sub-board close to the accommodating space, and the first fixing parts of the first fixing member and the second fixing member have no overlap with the orthographic projection of the light bar on the first sub-board.

[0013] In some embodiments, the side plate further includes a second side plate defining the accommodation portion; two ends of the second side plate are respectively connected to the second sub-plate and the third sub-plate;

[0014] At least one second fixing component is arranged between the second side plate and the light guide plate.

[0015] In some embodiments, the backlight module includes a second fixing component, and the second fixing component is arranged opposite to the first sub-board.

[0016] In some embodiments, the first fixing member and the second fixing member each include a first fixing portion, a second fixing portion and a third fixing portion connected in sequence;

[0017] The first fixing parts of the first fixing member and the second fixing member are both arranged between the first sub-board and the protruding structure; the second fixing part of the first fixing member is arranged between the second sub-board and the protruding structure, and the second fixing part of the second fixing member is arranged between the third sub-board and the protruding structure; the third fixing parts of the first fixing member and the second fixing member are both arranged between the second side panel and the main structure.

[0018] In some embodiments, both the first fixing member and the second fixing member further include a recessed portion disposed at a connection between the first fixing portion and the second fixing portion, and the recessed portion is located on a side of the first fixing portion close to the protruding structure.

[0019] In some embodiments, the backlight module also includes a light bar; the light bar is arranged on the inner wall of the first sub-board close to the accommodating space, and the first fixing parts of the first fixing member and the second fixing member have no overlap with the orthographic projection of the light bar on the first sub-board.

[0020] In some embodiments, the portion of the light guide plate in contact with the second fixing component is a plane; and the second fixing component is a prismatic structure.

[0021] In some embodiments, the backlight module further includes an optical film material disposed on a side of the light guide plate away from the bottom plate;

[0022] The optical film material includes a diffusion layer, a prism layer and a brightness enhancement layer which are stacked in sequence in a direction away from the bottom plate, and the distances between the three and the side plate are equal, or the distances between the three and the side plate increase monotonically in a direction approaching the bottom plate.

[0023] In some embodiments, the backlight module further includes a middle frame, and the middle frame includes a connecting frame and a carrying frame connected to each other;

[0024] The connecting frame is located on the side of the side plate away from the light guide plate, and the connecting frame is clamped with the side plate; the supporting frame is located on the side of the optical film material away from the bottom plate, and the supporting frame has a first window arranged corresponding to the optical film material.

[0025] In some embodiments, the back plate is formed by stamping of sheet metal.

[0026] In a second aspect, the present disclosure further provides a display device, which includes the backlight module in the above embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1a It is a schematic diagram of the structure of the convex corner in the existing rectangular backlight module;

[0028] Figure 1b It is a structural schematic diagram of a positioning column in an existing rectangular backlight module;

[0029] Figure 1c It is a structural schematic diagram of an L-shaped structure in an existing rectangular backlight module;

[0030] Figure 2a It is a schematic diagram of the structure of a boss in an existing circular backlight module;

[0031] Figure 2b This is a light path diagram of an existing circular backlight module under a wide viewing angle range;

[0032] Figure 2c A light path diagram of light leakage of an existing circular backlight module;

[0033] Figure 2d A schematic diagram of the forces acting on an existing circular backlight module during movement;

[0034] Figure 3 A schematic diagram of the structure of a backlight module provided in an embodiment of the present disclosure;

[0035] Figure 4 A schematic structural diagram of a first side plate provided in an embodiment of the present disclosure;

[0036] Figure 5 A schematic diagram of the structure of a light guide plate provided in an embodiment of the present disclosure;

[0037] Figure 6 A schematic diagram of the structure of a first fixing assembly provided in an embodiment of the present disclosure;

[0038] Figure 7 A schematic diagram of the structure of a second fixing assembly provided in an embodiment of the present disclosure;

[0039] Figure 8 A partial schematic diagram of a backlight module provided in an embodiment of the present disclosure at the position of a light bar;

[0040] Fig. 9 A partial schematic diagram of a backlight module provided in an embodiment of the present disclosure at the position of a light bar;

[0041] Fig.10 A partial schematic diagram of a backlight module provided in an embodiment of the present disclosure where the first fixing component and the second fixing component are not provided;

[0042] Fig.11 A light path diagram of the backlight module provided in the embodiment of the present disclosure under a wide viewing angle range;

[0043] Fig.12 A light path diagram of a backlight module provided in an embodiment of the present disclosure;

[0044] Fig.13 An exploded view of a backlight module provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0046] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0047] The conventional vehicle-mounted backlight module is a rectangular module, which includes a back panel 001, which includes a rectangular bottom panel and side panels connected to the edges of the rectangular bottom panel, and the rectangular bottom panel and the side panels form a receiving space. The vehicle-mounted backlight module also includes a rectangular light guide plate 002 and a light bar 004 arranged in the receiving space. Figure 1a-1c This is the fixing diagram of the rectangular light guide plate and the back plate, refer to Figure 1a , the light bar 004 is arranged on an inner wall of the back plate 001, and the rectangular light guide plate 002 is provided with two trapezoidal convex corners 005 on the side facing the light bar 004, and the trapezoidal convex corners 005 abut against the back plate 001 to prevent the light guide plate 002 from hitting the light bar 004. In addition, referring to Figure 1b , three positioning posts 006 are also arranged on the inner wall of the back plate 004, and three grooves are arranged on the light guide plate 002 at positions corresponding to the three positioning posts 006, so as to realize the clamping of the positioning posts 006 and the grooves. Two L-shaped structures 003 are arranged on the side of the rectangular light guide plate 002 away from the light bar 004, referring to Figure 1c The L-shaped structure 003 is filled between the light guide plate 002 and the back plate 001 to fix the light guide plate 002 and the back plate 001 relatively.

[0048] In recent years, with the rapid development of smart products, the market has higher and higher requirements for the diversification of backlight module shapes, and circular or quasi-circular backlight modules have been applied. Taking the circular backlight module as an example, since the frame of the arc part of the circular backlight module is narrow, the design of the positioning column will affect the display effect. Therefore, the traditional positioning column and the light guide plate groove are not applicable. In the prior art, since the distance between the circular light guide plate and the back plate in the circular backlight module is small, there is not enough space to place the light bar, so a boss 007 is added to the circular light guide plate in the circular backlight module. Figure 2a . In the prior art, the light guide plate 002 and the back plate 001 are fixed in the following manner: a groove is dug in the side plate portion corresponding to the boss 007, and the boss 007 is engaged with the groove to achieve relative fixation of the light guide plate 002 and the back plate 001. However, this fixing method has the following problems: 1. The material of the back plate 001 is generally metal. When the groove is dug in the back plate 001, metal burrs are inevitably present on the edge of the groove. When the light guide plate 002 and the back plate 001 are assembled, the burrs are likely to scratch the light guide plate 002, affecting the yield of the light guide plate 002; 2. Light will gather at the boss position of the light guide plate 002. Figure 2b , the backlight module can be divided into the display area Q1 and the frame area Q2. Among them, the width d1 of the frame area Q2 is 3.5mm, and the distance d2 between the middle frame 008 and the display area Q1 is 0.6mm. At a 60° viewing angle, there is a bright spot at the boss position, which makes the boss position and the non-boss position have obvious differences in display, resulting in reduced picture uniformity, affecting the picture display effect and user experience; 3. When digging grooves on the side panels, light will leak from the grooves, causing light leakage, affecting product quality, refer to Figure 2c ; 4. During the driving process of the vehicle, the vibration is large, causing the light guide plate 002 to vibrate along the three directions of X / Y / Z in the accommodation space. When vibrating along the X direction, refer to Figure 2d , the boss 007 frequently hits the side wall of the groove, so that the shear force exerted on the boss 007 by the side wall is concentrated on the root of the boss 007, that is, the connection between the boss 007 and the circular light guide plate 002, which makes the root of the boss easy to break and reduces the reliability of the product.

[0049] Based on the above problems, the present disclosure provides a backlight module, referring to Figure 3, the backlight module includes a back panel, a light guide plate 2 and a light bar 51. The back panel includes a bottom panel 13 and a side panel connected to the edge of the bottom panel 13, the bottom panel 13 is connected to the side panel to form a containing space, and the containing space can be divided into a containing portion and at least one limiting groove. The side panel includes a first side panel 11 for defining the limiting groove and a second side panel 12 for defining the containing portion, the first side panel 11 and the second side panel 12 are connected end to end, and the light bar 51 is arranged on the inner wall of the first side panel 11 facing the containing space. The light guide plate 2 includes a main structure 21 located in the containing portion and at least one protruding structure 22 located in the limiting groove, the main structure 21 is mainly used for emitting light, and the protruding structure 22 is mainly used for limiting the light guide plate 2. The backlight module disclosed in the present invention also includes a first fixing component 3 arranged between the first side panel 11 and the protruding structure 22. In the embodiment of the present disclosure, the first fixing component 3 is made of a highly elastic polymer material such as rubber, so the compression amount of the first fixing component 3 can be used as the expansion space of the light guide plate 2, preventing the light guide plate 2 from hitting the side plate due to heating, and can also ensure that the light guide plate 2 and the back plate can be relatively fixed during movement. At the same time, the first fixing component 3 can also ensure that the protruding structure 22 maintains a certain distance from the light bar 51 on the inner wall of the first side plate 11, preventing the protruding structure 22 from hitting the light bar 51 during movement, thereby improving the reliability of the product. Compared with the prior art, the backlight module disclosed in the present disclosure does not need to be provided with positioning columns on the side plates, and does not need to be grooved on the light guide plate 2, so stress concentration can be reduced and local fracture of the light guide plate 2 can be avoided.

[0050] It should be noted that the backlight module of the present disclosure can be provided with at least one limiting groove. When a plurality of limiting grooves are included, the limiting grooves can be evenly distributed around the accommodating portion. For example, when the backlight module includes two limiting grooves, the two limiting grooves can be provided on two opposite sides of the accommodating portion; when the backlight module includes three limiting grooves, the connecting lines of the three limiting grooves form an equilateral triangle, and the three limiting grooves are provided at the three vertex positions of the equilateral triangle; and so on. When the backlight module includes a plurality of limiting grooves, a light bar 51 is provided on the inner wall of the first side plate 11 close to the accommodating space that at least partially defines the limiting grooves. For the convenience of description, the following description will only take the backlight module including one limiting groove as an example.

[0051] In the embodiments of the present disclosure, continue to refer to Figure 3, at least part of the orthographic projection of the first side panel 11 on the plane where the bottom panel 13 is located is a straight line, and the straight line is an orthographic projection of a straight plate, and the light bar 51 is arranged on the inner wall of the straight plate facing the accommodating space. The orthographic projection of the second side panel 12 on the plane where the bottom panel 13 is located may include a straight line or an arc. For the sake of convenience, the following description takes the orthographic projection of the second side panel 12 on the plane where the bottom panel 13 is located as an arc as an example to illustrate the backlight module of the present disclosure. It should be noted that the shape of the light guide plate 2 is adapted to the accommodating space formed by the back panel, and there is only a very narrow assembly gap between the light guide plate 2 and the side panel, and the assembly gap is used to place fixed components.

[0052] In some examples, reference Figure 3-Figure 4 , the first side panel 11 includes a first sub-panel 111 and a second sub-panel 112 and a third sub-panel 113 connected to the two ends of the first sub-panel 111 respectively, and the two ends of the second side panel 12 are connected to the second sub-panel 112 and the third sub-panel 113 respectively. That is, the second side panel 12, the second sub-panel 112, the first sub-panel 111 and the third sub-panel 113 are connected end to end in sequence to form a complete side panel. Among them, the positive projection of the accommodating portion defined by the second side panel 12 on the bottom panel 13 is a circle, the distance d3 between the first sub-panel 111 and the center of the circle O is greater than the distance d4 between the second side panel 12 and the center of the circle O, and the first sub-panel 111, the second sub-panel 112 and the third sub-panel 113 define a limit groove protruding in the direction away from the center of the circle O. Further, the first sub-panel 111 is a straight plate, and its positive projection on the bottom panel 13 is a straight line segment, and the light bar 51 is arranged on the inner wall of the first sub-panel 111 facing the accommodating space. The orthographic projections of the second sub-board 112 and the third sub-board 113 on the bottom plate 13 are both arc segments, and the arc segments protrude toward the side close to the accommodating space. This arrangement enables the first sub-board 111, the second sub-board 112 / the third sub-board 113, and the second side plate 12 to be smoothly connected, avoiding the formation of sharp corners, thereby preventing the sharp corners from damaging the light guide plate 2 during movement.

[0053] Correspondingly, refer to Figure 3 and Figure 5, the light guide plate 2 includes a main structure 21 and a protruding structure 22 connected thereto, the main structure 21 is located in the accommodating portion, and the protruding structure 22 is located in the limiting groove. The orthographic projection of the main structure 21 on the bottom plate 13 is a circle, and the orthographic projection of the protruding structure 22 on the bottom plate 13 is a first figure. Among them, the first figure includes a first side S1 and a second side S2 that are relatively arranged, and a third side S3 and a fourth side S4 that connect the first side S1 and the second side S2. The first side S1 is connected to the main structure 21, the second side S2 is opposite to the light bar 51, the third side S3 and the fourth side S4 are both arcs, and the arcs protrude toward the side close to the main structure 21. It should be noted that for the light guide plate 2, it includes multiple side surfaces, among which the side surface opposite to the light bar 51 is the light incident surface of the light guide plate 2, and the other side surfaces are non-light incident surfaces, and a reflective sheet or a light shielding sheet is provided on the non-light incident surface. Figure 3 and Figure 5 In the backlight module shown, the side opposite to the first sub-plate 111 is the light incident surface, and the side opposite to the second sub-plate 112, the third sub-plate 113, and the second side plate 12 are all non-light incident surfaces. The reflective sheet provided on the non-light incident surface can make all the light emitted from the exit surface of the light guide plate 2 (i.e., the surface of the light guide plate 2 facing away from the bottom plate 13), thereby ensuring the utilization rate of the light, preventing light leakage, and improving the display brightness. It can be understood that when the backlight module includes a plurality of limit grooves and a plurality of light strips 51 are provided on the limit grooves, the light guide plate 2 is also provided with a plurality of light incident surfaces accordingly.

[0054] In some examples, reference Figure 3 and Figure 6 , the first fixing component 3 is disconnected from the first fixing member 31 and the second fixing member 32. The first fixing member 31 is arranged between the first sub-board 111 and the second sub-board 112 and the protruding structure 22, that is, the first fixing member 31 is filled in the assembly gap between the first sub-board 111 and the second sub-board 112 and the protruding structure 22. The second fixing member 32 is arranged between the first sub-board 111 and the third sub-board 113 and the protruding structure 22, that is, the second fixing member 32 is filled in the assembly gap between the first sub-board 111 and the second sub-board 112 and the protruding structure 22, so that the relative fixation of the light guide plate 2 and the back plate can be achieved.

[0055] Specifically, the first fixing member 31 and the second fixing member 32 each include a first fixing portion and a second fixing portion connected to the first fixing portion. For the first fixing member 31, the first fixing portion 311 is arranged between the first sub-plate 111 and the protruding structure 22, and the second fixing portion 312 is arranged between the second sub-plate 112 and the protruding structure 22. For the second fixing member 32, the first fixing portion 321 is arranged between the first sub-plate 111 and the protruding structure 22, and the second fixing portion 322 is arranged between the third sub-plate 113 and the protruding structure 22. It can be understood that the shape of the first fixing portion 311 / 321 and the second fixing portion 312 / 322 depends on the shape of the assembly gap between the light guide plate 2 and the side plate. Therefore, in this embodiment, the first fixing portion of the first fixing member 31 and the second fixing member 32 is a linear rubber, and the second fixing portion is an arc-shaped rubber.

[0056] It should be noted that, in order to prevent the first fixing component 3 from affecting the luminous effect of the light bar 51, the first fixing portion is set to have no overlap with the orthographic projection of the light bar 51 on the first sub-board 111. Figure 3 The light bar 51 includes a plurality of light sources, which are arranged in the middle of the first sub-board 111, the first fixing portion 311 of the first fixing component 3 is arranged between one of the plurality of light sources closest to the second sub-board 112 and an edge of the first sub-board 111 close to the second sub-board 112, and the first fixing portion 321 of the second fixing component 4 is arranged between one of the plurality of light sources closest to the third sub-board 113 and an edge of the first sub-board 111 close to the third sub-board 113. In some examples, the length of the first fixing portion is 1.6 mm.

[0057] In some examples, continue to refer to Figure 6 The first fixing member 31 and the second fixing member 32 also include a recess 33 arranged at the connection between the first fixing portion and the second fixing portion. The recess 33 is located on the side of the first fixing portion 311 / 321 close to the protruding structure 22. The recess 33 can reduce the stress generated when the first fixing component 3 is bent, thereby preventing the first fixing component 3 from being deformed or even broken.

[0058] In some examples, the first fixing member 31 and the second fixing member 32 both further include a third fixing portion connected to the second fixing portion. Figure 3 and Figure 6, the third fixing portion 313 / 323 is arranged between the second side plate 12 and the main structure 21. The third fixing portion 313 / 323 is an arc-shaped rubber. Setting the third fixing portion 313 / 323 can enhance the fixing effect, and at the same time can also avoid light leakage and enhance the display effect. It should be noted that the thickness of the first fixing component 3 disclosed in the present invention is equal to the height of the accommodating space along the thickness direction of the backlight module, so that the first fixing component 3 can be prevented from being displaced along the thickness direction of the backlight module during movement, affecting the fixing effect and the display effect.

[0059] In some examples, reference Figure 3 and Figure 7 , the backlight module also includes at least one second fixing component 4 arranged between the second side panel 12 and the light guide plate 2. The second fixing component 4 fills the assembly gap between the second side panel 12 and the side panel, so the shape of the second fixing component 4 depends on the shape of the assembly gap. In one example, the backlight module includes only one second fixing component 4, and the second fixing component 4 is arranged opposite to the first sub-panel 111. At this time, the connecting line of the second fixing component 4, the first fixing member 31 and the second fixing member 32 constitutes an isosceles triangle, and the three are respectively located at the three vertices of the isosceles triangle. The connecting line of the second fixing component 4 and the first fixing member 31, and the connecting line of the second fixing component 4 and the second fixing member 32 are respectively the two waists of the isosceles triangle. In this way, the relative fixation of the light guide plate 2 and the back panel can be achieved through the first fixing component 3 and the second fixing component 4. In one example, the side of the light guide plate 2 arranged opposite to the second fixing component 4 is a plane, and the second fixing component 4 can be a prismatic structure, that is, a linear rubber.

[0060] In some examples, reference Figure 8 The backlight module also includes a driving circuit 53 for driving the light bar 51 to emit light, and a thermistor 52 for detecting the temperature of the light bar 51. The thermistor 52 is arranged between the light sources, and the driving circuit 53 is arranged on the inner wall of the side plate adjacent to the first sub-board 111, such as the inner wall of the second sub-board 112 or the third sub-board 113. The light bar 51, the thermistor 52, the driving circuit 53, and the first fixing component 3 and the second fixing component 4 mentioned above are all connected to the side plate through an adhesive layer, and the adhesive layer includes but is not limited to a double-sided adhesive tape.

[0061] In some examples, the backlight module further includes a bottom reflector 6 and an optical film material 7 . Figure 8 It is a partial schematic diagram of the backlight module at the position of the light bar. Fig. 9 is a partial schematic diagram of a backlight module without a second fixing component. Fig.10 This is a partial schematic diagram of the backlight module where the second fixing component is set. Figure 8-Figure 10, the bottom reflector 6 is arranged between the light guide plate 2 and the bottom plate 13, and the bottom reflector 6 enables all the light emitted by the light strip 51 to be emitted from the light emitting surface of the backlight module (upward direction in the figure), thereby improving the utilization rate of the light. The optical film material 7 is arranged on the side of the light guide plate 2 away from the bottom plate 13, which can optimize the path of the light emitting light of the backlight module. Specifically, the optical film material 7 includes a diffusion layer 71, a prism layer 72 and a brightening layer 73 which are stacked in sequence in a direction away from the bottom plate 13, and the orthographic projections of the three on the bottom plate 13 all cover at least part of the orthographic projection of the light guide plate 2 on the bottom plate 13, so as to ensure that most of the light is used and improve the display brightness. In one example, the distance between the three and the side panel does not increase monotonically in the direction away from the bottom plate 13. Specifically, refer to Figure 8 The distances between the protruding structure 22, the diffusion layer 71, the prism layer 72 and the brightness enhancement layer 73 and the first sub-panel 111 decrease monotonically in the direction away from the bottom plate 113. Fig. 9 The distances between the protruding structure 22, the diffusion layer 71 and the prism layer 72 and the second side plate 12 are equal, and the distance between the brightness enhancement layer 73 and the second side plate 12 is smaller than the distances between the first three and the second side plate 12. Fig.10 , due to the second fixing assembly 4, the distance between the protruding structure 22 and the second side plate 12 is the largest, the distance between the diffusion layer 71 and the prism layer 72 and the second side plate 12 is equal, and the distance between the brightness enhancement layer 73 and the second side plate 12 is smaller than the distance between the two and the second side plate 12. In some examples, the brightness enhancement layer 73 is 0.05 mm inward compared to the prism layer 72, which can ensure the expansion gap of the optical film material and the consistency of assembly, and at the same time improve the light utilization rate and avoid light leakage.

[0062] In some examples, reference Figure 11-Figure 12 , the backlight module also includes a middle frame 8, and the middle frame 8 includes a connecting frame 81 and a supporting frame 82. Among them, the connecting frame 81 is located on the side of the side panel away from the accommodating space and is clamped with the side panel, and there is a certain assembly gap between the connecting frame 81 and the side panel. The supporting frame 82 is located on the side of the optical film material 7 away from the light guide plate 2, and the supporting frame is provided with a first window Window for light transmission opposite to the optical film material 7. The effective light emitting area of ​​the backlight module is located within the limited range of the positive projection of the first window on the bottom plate 13. Exemplarily, the middle frame 8 includes but is not limited to a middle plastic frame or a middle iron frame. Refer to Fig.11 and Fig.12 The light path diagram shows that since the light guide plate 2 in the backlight module disclosed in the present invention has no special structure, there is no light gathering, no bright spots under a wide viewing angle, and according to Fig.11 According to the optical path diagram, only the top layer of film can be seen under a wide viewing angle, and the image is single, so it has a high image uniformity and good display quality. Fig.12Since there is no need to dig holes in the side wall of the back panel, after the light is emitted from the side of the light guide plate, it is reflected back into the light guide plate 2 by the side panel, so that the light cannot leak from the holes. Therefore, light leakage from the back can be completely eliminated, improving product quality.

[0063] In some examples, the backlight module of the present disclosure can be applied to a small-sized display screen. In this case, the back panel can be formed by sheet metal stamping, and the stamped back panel is then formed into a back panel of a specific shape through a bending process. At this time, there will be gaps between adjacent side panels. For example, there is a gap at the connection between the first sub-panel 111 and the second sub-panel 112. The light of the light guide plate 2 can be deducted from the gap, and external stray light can also enter the backlight module from the gap. At this time, the first fixing component 3 is set to fill between the side panel and the light guide plate 2, and the gap can also be closed to prevent light leakage, while improving the utilization rate of the light at the corner of the backlight module and improving the display effect.

[0064] Based on the specific structure of the above-mentioned backlight module, the present disclosure also provides an assembly method of the backlight module. Fig.13 This is an exploded view of the backlight module, refer to Fig.13 , the assembly method specifically includes:

[0065] S1. Remove the double-sided adhesive tape release film on the back of the light bar 51, thermistor 52 and driving circuit 53, and stick the light bar 51 and thermistor 52 to the inner wall of the first sub-board 111 along the alignment line on the inner wall of the back plate, and stick the driving circuit 53 to the inner wall of the second sub-board 112.

[0066] S2, remove the double-sided adhesive tape release film on the first fixing member 31 and the second fixing member 32, and fit the side with the double-sided adhesive tape to the side panel to fix the first fixing member 31 and the second fixing member 32 to the inner wall of the side panel.

[0067] S3, remove the double-sided adhesive tape release film on the second fixing component 4, and fit the side with the double-sided adhesive tape to the side panel opposite to the first sub-panel 111 to fix the second fixing component 4 on the inner wall of the side panel.

[0068] S4, stick the light guide plate 2 fixing tape onto the bottom plate 13, and remove the protective film on the tape surface.

[0069] S5, align the protruding structure 22 of the light guide plate 2 with the limiting groove, and make the protruding structure 22 press the first fixing member 31 and the second fixing member 32, and fix the light guide plate 2 and the bottom plate 13 together with the alignment line on the bottom plate 13 by using the light guide plate 2 fixing tape.

[0070] The light guide plate 2 of the present disclosure is fixed to the bottom plate 13 by a double-sided adhesive tape, and is relatively fixed to the side plate by a first fixing component 3 and a second fixing component 4, so as to prevent the light guide plate 2 from shaking during movement. The first fixing component 3 and the second fixing component 4 are made of a high-elastic polymer material with a low hardness, such as rubber with a hardness of 30HB. On the one hand, the rubber can provide sufficient support for the light guide plate 2 to prevent the light guide plate 2 from shaking. On the other hand, the rubber has high elasticity and can provide sufficient expansion space for the light guide plate 2 when it expands due to temperature rise.

[0071] The present disclosure also provides a display device, which includes the backlight module in any of the above embodiments. The display device can be, for example, a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a vehicle-mounted device, or any other product with a display function.

[0072] In some embodiments, the display device may include a liquid crystal display module and a backlight module arranged on the backlight side of the liquid crystal display module, and the backlight module adopts the backlight module in the above embodiments. Among them, the liquid crystal display module includes a liquid crystal display substrate, a color filter substrate arranged on the liquid crystal display substrate near the light-emitting side, an upper polarizer arranged on the color filter substrate away from the liquid crystal display substrate, a double-sided laminating tape arranged on the side of the upper polarizer away from the color filter substrate, a glass cover plate arranged on the side of the double-sided laminating tape away from the upper polarizer, a lower polarizer arranged on the side of the liquid crystal display substrate away from the color filter substrate, and a driver chip arranged on the liquid crystal display substrate near the light-emitting side, and the orthographic projection of the driver chip on the liquid crystal display substrate and the orthographic projection of the color filter substrate on the liquid crystal display substrate have a certain gap, and the driver chip is closer to the light bar than the color filter substrate. The liquid crystal display module also includes a second circuit board, the second circuit board is arranged on the surface of the liquid crystal display substrate near the light-emitting side, and the second circuit board is located on the side of the driver chip away from the color filter substrate.

[0073] Among them, the glass cover is mainly used to protect the liquid crystal display substrate and the color film substrate to reduce the risk of screen damage. The upper polarizer and the lower polarizer mainly play a polarization role and are used to generate usable polarized light. The driver chip is mainly used to control the transmission of photoelectric signals. The second circuit board is mainly used to provide electrical signals to the transistors in the liquid crystal display substrate.

[0074] Other essential components of the liquid crystal display device should be understood by those skilled in the art and will not be described in detail herein and should not be construed as limiting the present disclosure.

[0075] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill 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 backlight module, comprising: A back plate, the back plate comprising a bottom plate and side plates connected to the edge of the bottom plate, the side plates being connected to the bottom plate to form a containing space; The accommodating space includes an accommodating portion and at least one limiting groove; A light guide plate is arranged on the bottom plate; the light guide plate comprises a main structure and at least one protruding structure connected to the main structure; the main structure is located in the accommodating portion, and the protruding structure is located in the limiting groove; Wherein, the side plate includes a first side plate for defining the limiting groove; a first fixing component is arranged between the first side plate and the protruding structure, for fixing the back plate and the light guide plate relative to each other.

2. The backlight module according to claim 1, wherein: The first side panel includes a first sub-panel and a second sub-panel and a third sub-panel respectively connected to two ends of the first sub-panel; The first fixing assembly includes a first fixing member and a second fixing member that are disconnected from each other; the first fixing member is arranged between the first sub-board, the second sub-board and the protruding structure; and the second fixing member is arranged between the first sub-board, the third sub-board and the protruding structure.

3. The backlight module according to claim 2, wherein: The first fixing member and the second fixing member each include a first fixing portion and a second fixing portion connected; The first fixing parts of the first fixing member and the second fixing member are both arranged between the first sub-board and the protruding structure; the second fixing part of the first fixing member is arranged between the second sub-board and the protruding structure, and the second fixing part of the second fixing member is arranged between the third sub-board and the protruding structure; Wherein, the first fixing member and the second fixing member both further include a recessed portion arranged at the connection between the first fixing portion and the second fixing portion, and the recessed portion is located on a side of the first fixing portion close to the protruding structure.

4. The backlight module according to claim 3, wherein: The backlight module also includes a light bar; the light bar is arranged on the inner wall of the first sub-board close to the accommodating space, and the first fixing parts of the first fixing member and the second fixing member have no overlap with the orthographic projection of the light bar on the first sub-board.

5. The backlight module according to claim 2, wherein: The side plate further includes a second side plate defining the accommodation portion; two ends of the second side plate are respectively connected to the second sub-plate and the third sub-plate; At least one second fixing component is arranged between the second side plate and the light guide plate.

6. The backlight module according to claim 5, wherein: The backlight module includes a second fixing component, and the second fixing component is arranged opposite to the first sub-board.

7. The backlight module according to claim 5, wherein: The first fixing member and the second fixing member each include a first fixing portion, a second fixing portion and a third fixing portion connected in sequence; The first fixing parts of the first fixing member and the second fixing member are both arranged between the first sub-board and the protruding structure; the second fixing part of the first fixing member is arranged between the second sub-board and the protruding structure, and the second fixing part of the second fixing member is arranged between the third sub-board and the protruding structure; the third fixing parts of the first fixing member and the second fixing member are both arranged between the second side panel and the main structure.

8. The backlight module according to claim 7, wherein: The first fixing member and the second fixing member both further include a recessed portion disposed at the connection between the first fixing portion and the second fixing portion, and the recessed portion is located on a side of the first fixing portion close to the protruding structure.

9. The backlight module according to claim 7, wherein: The backlight module also includes a light bar; the light bar is arranged on the inner wall of the first sub-board close to the accommodating space, and the first fixing parts of the first fixing member and the second fixing member have no overlap with the orthographic projection of the light bar on the first sub-board.

10. The backlight module according to claim 6, wherein: The portion of the light guide plate in contact with the second fixing component is a plane; and the second fixing component is a prism structure.

11. The backlight module according to any one of claims 1 to 10, wherein: The backlight module further comprises an optical film material arranged on a side of the light guide plate away from the bottom plate; The optical film material includes a diffusion layer, a prism layer and a brightness enhancement layer which are stacked in sequence in a direction away from the bottom plate, and the distances between the three and the side plate are equal, or the distances between the three and the side plate increase monotonically in a direction approaching the bottom plate.

12. The backlight module according to claim 11, wherein: The backlight module further includes a middle frame, and the middle frame includes a connecting frame and a carrying frame connected to each other; The connecting frame is located on the side of the side plate away from the light guide plate, and the connecting frame is clamped with the side plate; the supporting frame is located on the side of the optical film material away from the bottom plate, and the supporting frame has a first window arranged corresponding to the optical film material.

13. The backlight module according to any one of claims 1 to 10, wherein: The back plate is formed by sheet metal stamping.

14. A display device, comprising the backlight module according to any one of claims 1 to 13.

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