Display device and backlight module thereof

Abstract

A backlight module includes a housing and a light guide plate, a light source, and a resilient retaining member disposed within the housing. The housing includes a back plate and a side wall. The side wall includes a first wall portion having two openings. The light guide plate has a first side edge corresponding to the first wall portion of the side wall. The resilient retaining member includes a body and two protrusions. The body is disposed between the first wall portion of the side wall and the first side edge of the light guide plate. The two protrusions extend into the two openings of the first wall portion. The light guide plate also has a groove that engages with the body of the resilient retaining member. This structural configuration helps improve the reliability of the backlight module, enabling its application in environments with large temperature variations and high vibration (e.g., vehicles).

Description

Technical Field

[0001] This disclosure relates to a display device and its backlight module. Background Technology

[0002] Traditional automotive displays and backlight modules have structural design flaws, such as the light guide plate being prone to deformation or displacement in high-temperature environments or when subjected to vibration or shaking. Summary of the Invention

[0003] In view of this, one objective of this disclosure is to provide a display device and backlight module with high reliability.

[0004] According to some embodiments disclosed herein, a backlight module includes a housing, a light guide plate, a light source, and an elastic limiting member. The housing includes a back plate and a side wall. The side wall includes a first wall portion having two first openings. The light guide plate is disposed within the housing and has a first side edge corresponding to the first wall portion of the side wall. The light source is disposed within the housing and configured to emit light towards the light guide plate. The elastic limiting member includes a body and two first protrusions. The body is disposed between the first wall portion of the side wall and the first side edge of the light guide plate. The two first protrusions are integrally formed with the body, and each of the two first protrusions extends into one of the two first openings of the first wall portion. The light guide plate also has a first groove located on the first side edge and engaging with the body of the elastic limiting member.

[0005] In one or more embodiments disclosed herein, the body of the elastic limiting member has at least one first rounded corner, and the first groove of the light guide plate has at least one second rounded corner, the second rounded corner abutting against the first rounded corner.

[0006] In one or more embodiments disclosed herein, in the direction in which the first wall portion of the sidewall extends, the maximum width of the first groove of the light guide plate is greater than the maximum width of the body of the elastic limiting member.

[0007] In one or more embodiments disclosed herein, the light guide plate includes two first extensional structures located on a first side and on both sides of a first groove. The two first extensional structures extend into two first openings in the first wall portion. Each of the two first extensional structures has a slope located on the side of the two first extensional structures away from the first groove.

[0008] In one or more embodiments disclosed herein, the elastic limiting member further includes a second protrusion located between the two first protrusions. A first portion of the sidewall also has a second opening located between the two first openings. The second protrusion engages with the second opening.

[0009] In one or more embodiments disclosed herein, the light guide plate further has a second side opposite to the first side, and the light source is configured to emit light toward the second side of the light guide plate.

[0010] In one or more embodiments disclosed herein, the backlight module further includes an optical film disposed on the side of the light guide plate away from the back plate and having a third side edge corresponding to the first side edge of the light guide plate. The elastic limiting member also includes a baffle extending from the side of the body away from the back plate and located between the third side edge of the optical film and the first wall portion of the sidewall.

[0011] In one or more embodiments disclosed herein, the optical diaphragm has a second groove located on a third side and engaging with a baffle of an elastic limiting member. Two second extensional structures are located on both sides of the second groove, and each of the two second extensional structures extends into one of the two first openings in the first wall portion.

[0012] According to some embodiments disclosed herein, a display device includes a display panel and a backlight module disposed on the back side facing the display panel. The backlight module includes a housing, a light guide plate, an optical film, a light source, and a resilient limiting member. The housing includes a back plate and a side wall, the side wall including a first wall portion having an opening. The light guide plate is disposed in the housing and has a first side edge corresponding to the first wall portion of the side wall. The optical film is disposed on the side of the light guide plate away from the back plate and has a third side edge corresponding to the first side edge of the light guide plate. The light source is disposed in the housing and configured to emit light facing the light guide plate. The resilient limiting member covers the opening and includes a body and a baffle. The body is disposed between the first wall portion of the side wall and the first side edge of the light guide plate and abuts against the first wall portion. The baffle extends from the side of the body away from the back plate and is located between the third side edge of the optical film and the first wall portion of the side wall. The light guide plate also has a groove located on the first side edge and engaging with the body of the resilient limiting member.

[0013] According to some embodiments disclosed herein, a display device includes a display panel and a backlight module disposed on the back side facing the display panel. The backlight module includes a housing, a light guide plate, an optical film, a light source, and an elastic limiting member. The housing includes a back plate and a side wall, the side wall including a first wall portion having two openings. The light guide plate is disposed in the housing and has a first side edge corresponding to the first wall portion of the side wall. The optical film is disposed on the side of the light guide plate away from the back plate and has a third side edge corresponding to the first side edge of the light guide plate. The light source is disposed in the housing and configured to emit light facing the light guide plate. The elastic limiting member includes a body, a baffle, and two protrusions. The body is disposed between the first wall portion of the side wall and the first side edge of the light guide plate, the baffle extending from the side of the body away from the back plate and located between the third side edge of the optical film and the first wall portion of the side wall. The two protrusions are integrally formed with the body, and the two protrusions respectively extend into the two openings of the first wall portion.

[0014] In summary, the backlight module disclosed herein includes an elastic limiting member disposed between the light guide plate and the side wall of the housing, the elastic limiting member being used to fix the light guide plate. The above-described structural configuration of the light guide plate, elastic limiting member, and side wall helps improve the reliability of the backlight module, enabling its application in environments with large temperature variations and high vibration (e.g., vehicles). Attached Figure Description

[0015] To make the above and other objects, features, advantages and embodiments disclosed herein more apparent and understandable, the accompanying drawings are described below:

[0016] Figure 1 A perspective view of a display device according to an embodiment of this disclosure is provided;

[0017] Figure 2 For illustration Figure 1 The diagram shows a cross-sectional view of the display device at the mark 2-2' on line segment;

[0018] Figure 3 For illustration Figure 1 The diagram shows the assembly of the backlight module housing and the elastic limiting member of the display device.

[0019] Figure 4 For illustration Figure 1 An exploded view of the housing and elastic limiting member of the backlight module of the display device shown;

[0020] Figure 5 For illustration Figure 1 A top view of the housing, light guide plate, and elastic limiting member of the backlight module of the display device shown;

[0021] Figure 6 For illustration Figure 1 A top view of the housing, optical film, and elastic limiting member of the backlight module of the display device shown;

[0022] Figure 7 A cross-sectional view of a backlight module according to another embodiment of this disclosure is provided.

[0023] Figure 8 For illustration Figure 7 The diagram shows the assembly of the backlight module's housing and elastic limiting component.

[0024] Figure 9 For illustration Figure 7 An exploded view of the housing and elastic limiting component of the backlight module shown.

[0025] Figure 10 For illustration Figure 8 The diagram shows a cross-sectional view of the backlight module housing and elastic limiting member at the mark of line segment 10-10'.

[0026] [Symbol Explanation]

[0027] 15: Display device

[0028] 16: Display panel

[0029] 17: First Surface

[0030] 18: Second Surface

[0031] 19, 19A: Backlight module

[0032] 20,20A: Housing

[0033] 21: Back panel

[0034] 22,22A: Sidewall

[0035] 221, 221A: First wall portion

[0036] 222: Second wall section

[0037] 23: concave part

[0038] 241, 241A: First opening

[0039] 242,242A: Second opening

[0040] 29:Light exit

[0041] 30, 30A: Light guide plate

[0042] 31, 31A: First side

[0043] 32: Second side

[0044] 34: First extensional structure

[0045] 35: First groove

[0046] 36: Incline

[0047] 37: Second rounded corner

[0048] 40: Light source

[0049] 41: First gasket

[0050] 42: Second gasket

[0051] 45: Reflector

[0052] 50, 50A: Elastic limiting component

[0053] 51: First bump

[0054] 51A: Bump

[0055] 52: Second bump

[0056] 53,53A:Body

[0057] 54: Supporting structure

[0058] 541: First supporting structure

[0059] 542: Second support structure

[0060] 55: Groove

[0061] 56: baffle

[0062] 57: First rounded corner

[0063] 58: Incline

[0064] 60: Frame

[0065] 61: Part One

[0066] 62: Part Two

[0067] 65:Light exit

[0068] 70: Optical film

[0069] 72: Second groove

[0070] 73: Third side

[0071] 74: Second extensional structure

[0072] 77: Third rounded corner

[0073] D1: First Direction

[0074] D2: Second Direction

[0075] D3: Third direction

[0076] L1, L2: Distance Detailed Implementation

[0077] To make the description of this disclosure more detailed and complete, reference may be made to the accompanying drawings and the various embodiments described below. The elements in the drawings are not drawn to scale and are provided for illustrative purposes only. Many practical details are described below to provide a comprehensive understanding of this disclosure; however, those skilled in the art will understand that this disclosure can be practiced without one or more of these practical details, and therefore, these details should not be used to limit this disclosure.

[0078] Please refer to Figure 1 . Figure 1 A perspective view of a display device 15 according to an embodiment of the present disclosure is provided. The display device 15 includes a display panel 16 and a backlight module 19. The display panel 16 has opposing first surfaces 17 and second surfaces 18 (see...). Figure 2 The first surface 17 faces outward to display the image; that is, the first surface 17 is the display surface of the display panel 16. The second surface 18 is the back surface of the display panel 16, and the backlight module 19 is disposed facing the second surface 18 of the display panel 16. The backlight module 19 is configured to provide illumination to the display panel 16 so that the display panel 16 can display an image. The display device 15 disclosed herein is, for example, an automotive display, the display panel 16 is, for example, a liquid crystal display panel, and the backlight module 19 is, for example, an edge-lit backlight module, but is not limited thereto.

[0079] like Figure 1 As shown, the first surface 17 of the display panel 16 faces the first direction D1; in other words, the first direction D1 is the normal direction of the first surface 17 of the display panel 16. The display device 15 also has two edges extending along the second direction D2 and two other edges extending along the third direction D3. In some embodiments, the first direction D1, the second direction D2, and the third direction D3 are substantially perpendicular to each other.

[0080] It should be noted that the first direction D1, the second direction D2, and the third direction D3 are coordinate systems attached to the display device 15 and the backlight module 19. Therefore, when the orientation of the display device 15 and the backlight module 19 changes (for example, when they are converted to an upright or flat position), this coordinate system also turns accordingly.

[0081] Please refer to Figure 2 . Figure 2 For illustration Figure 1 The diagram shows a cross-sectional view of the display device 15 at the mark 2-2'. As shown, the backlight module 19 includes a housing 20, a light guide plate 30, and a light source 40. The housing 20 has a light outlet 29, and the display panel 16 is disposed at the light outlet 29 of the housing 20. The light guide plate 30 and the light source 40 are disposed within the housing 20, and the light source 40 is configured to emit light towards the light guide plate 30. The light emitted by the light source 40 enters the light guide plate 30 and exits towards the light outlet 29, illuminating the display panel 16. The light source 40 is, for example, a lamp board or light strip, and may include a circuit board and multiple light-emitting diode elements (LEDs), mini LEDs, or other light-emitting elements disposed on the circuit board. The backlight module 19 also includes at least one elastic limiting member 50, which is disposed within the housing 20 and used to fix the position of the light guide plate 30.

[0082] like Figure 2As shown, the housing 20 includes a connected back plate 21 and sidewalls 22. The back plate 21 is opposite to the light outlet 29, while the sidewalls 22 are bent from and extend from the back plate 21. The sidewalls 22 are, for example, perpendicular to the back plate 21, or for example, the sidewalls 22 may extend from the back plate 21 along a first direction D1. In some embodiments, the back plate 21 and the sidewalls 22 are integrally formed; in other words, the housing 20 is a one-piece housing. The sidewalls 22 may surround the back plate 21 on all four sides, but are not limited thereto. The sidewalls 22 include a first wall portion 221, and the light guide plate 30 has a first side edge 31. When the light guide plate 30 is disposed in the housing 20, the first side edge 31 corresponds to the first wall portion 221 of the sidewalls 22. The elastic limiting member 50 is clamped between the first wall portion 221 of the sidewall 22 and the first side edge 31 of the light guide plate 30. In other words, the elastic limiting member 50 and the sidewall 22, as well as the elastic limiting member 50 and the light guide plate 30, are in a tight fit. The elastic limiting member 50 may contain an elastomeric material (e.g., rubber). The elastic limiting member 50 may be an integrally formed element.

[0083] like Figure 2 As shown, the sidewall 22 further includes a second wall portion 222, and the light guide plate 30 further has a second side edge 32. When the light guide plate 30 is disposed in the housing 20, the second side edge 32 corresponds to the second wall portion 222 of the sidewall 22. In some embodiments, the backlight module 19 is a side-lit backlight module, and the light source 40 is disposed between the second wall portion 222 of the sidewall 22 and the second side edge 32 of the light guide plate 30, and emits light toward the second side edge 32 of the light guide plate 30.

[0084] like Figure 2 As shown, the second wall portion 222 and the first wall portion 221 are located on opposite sides of the side wall 22. In the illustrated embodiment, the second wall portion 222 and the first wall portion 221 are located on opposite sides of the housing 20 in the third direction D3. The second side edge 32 and the first side edge 31 are located on opposite sides of the light guide plate 30. In the illustrated embodiment, the second side edge 32 and the first side edge 31 are located on opposite sides of the light guide plate 30 in the third direction D3. Therefore, in the illustrated embodiment, the elastic limiting member 50 is provided on the side of the light guide plate 30 away from the light source 40. The first side edge 31 of the light guide plate 30 abuts against the elastic limiting member 50, while the second side edge 32 may abut against the light source 40 or the second wall portion 222 of the side wall 22. In some embodiments, a buffer member (not shown) is provided on the light source 40 or the second wall portion 222 of the side wall 22, and the second side edge 32 of the light guide plate 30 may abut against the buffer member. In some embodiments, the backlight module 19 may include a plurality of elastic limiting members 50 disposed on a plurality of wall portions of the side wall 22 to correspondingly abut against a plurality of sides of the light guide plate 30, for example, corresponding to abutting against the first side 31 of the light guide plate 30 away from the light source 40 and the other two sides adjacent to the first side 31.

[0085] like Figure 2 As shown, in some embodiments, the backlight module 19 further includes a reflective sheet 45 disposed between the light guide plate 30 and the back plate 21 of the housing 20, and covering the side of the light guide plate 30 near the back plate 21, i.e., covering the back side of the light guide plate 30. The reflective sheet 45 can reflect light so that the light shines towards the display panel 16 located at the light outlet 29. In some embodiments, the back plate 21 of the housing 20 also has at least one recess 23 formed inside the side wall 22. The backlight module 19 may further include at least one first gasket 41 disposed in the recess 23, which can support the reflective sheet 45 and the light guide plate 30, i.e., the first gasket 41 is located between the back plate 21 and the reflective sheet 45 or the light guide plate 30. In some embodiments, the recess 23 is a groove extending substantially parallel to the side wall 22, and the first gasket 41 is an elongated gasket disposed along the recess 23. The first gasket 41 may contain an elastomeric material (e.g., rubber).

[0086] like Figure 2 As shown, in some embodiments, the backlight module 19 further includes at least one optical film 70, which is disposed on the side of the light guide plate 30 away from the back plate 21, that is, on the front side or light-emitting surface of the light guide plate 30. In other words, the light guide plate 30 is disposed between the back plate 21 and the optical film 70. The optical film 70 may include a diffuser, a prism sheet, a brightness enhancement sheet, or other functional optical films. In some embodiments, the backlight module 19 includes multiple optical films 70, which are stacked with the light guide plate 30.

[0087] like Figure 2As shown, in some embodiments, the backlight module 19 further includes a frame 60 disposed on the housing 20 and configured to support the display panel 16. The display panel 16 may be disposed outside the frame 60 as shown, or it may be disposed inside the frame 60. The frame 60 may have a light exit port 65 to allow light emitted from the light source 40 to illuminate the display panel 16. In some embodiments, the frame 60 includes a first portion 61 and a second portion 62 connected together. The first portion 61 is substantially parallel to the back plate 21 and covers the peripheral area of ​​the optical film 70, and the display panel 16 is disposed on the first portion 61. The second portion 62 of the frame 60 is bent from the first portion 61 and extends outward along the opposite direction of the first direction D1 to the outside of the side wall 22 of the housing 20. In some embodiments, the second portion 62 of the frame 60 is substantially parallel to the side wall 22 of the housing 20. The second portion 62 of the frame 60 may be fixed to the side wall 22 of the housing 20 by snap-fit, adhesive, or other suitable means. In some embodiments, the backlight module 19 further includes at least one second spacer 42 disposed between the optical film 70 and the first portion 61 of the frame 60. In some embodiments, the second spacer 42 is adhesive to adhere and fix the optical film 70 to the frame 60. In some embodiments, the display panel 16 is disposed within the frame 60, and the second spacer 42 can adhere and fix the display panel 16 to the frame 60.

[0088] Please refer to the above as well. Figure 3 and Figure 4 . Figure 3 For illustration Figure 1 The diagram shows the assembly of the backlight module 19 housing 20 and the elastic limiting member 50 of the display device 15. Figure 4 For illustration Figure 1 An exploded view of the housing 20 and elastic limiting member 50 of the backlight module 19 of the display device 15 shown. Figures 2 to 4As shown, the elastic limiting member 50 includes a body 53 and two first protrusions 51. When the elastic limiting member 50 is assembled with the first wall portion 221, the body 53 is disposed between the first wall portion 221 of the side wall 22 and the first side edge 31 of the light guide plate 30, and abuts against the first wall portion 221. The two first protrusions 51 are disposed on both sides of the body 53 and protrude from the side of the body 53 away from the light guide plate 30. The first wall portion 221 of the side wall 22 has two first openings 241, and the two first protrusions 51 extend into the two first openings 241 respectively. In the second direction D2 extending from the first wall portion 221, the width of each first opening 241 is greater than the width of the corresponding first protrusion 51. For example, the width of each first opening 241 can be at least twice the width of the corresponding first protrusion 51. In this way, when the light guide plate 30 expands and squeezes the elastic limiting member 50 due to high temperature, the first opening 241 of the side wall 22 can provide space for the elastic limiting member 50 to be squeezed and deformed, preventing the elastic limiting member 50 from being squeezed, flipped and detached from the side wall 22, or causing the light guide plate 30 to be arched and displaced, thus losing its function of fixing the light guide plate 30.

[0089] like Figures 2 to 4 As shown, in some embodiments, the elastic limiting member 50 further includes a second protrusion 52, which connects to the body 53 and protrudes from the side of the body 53 away from the light guide plate 30 between the two first protrusions 51. Correspondingly, the first wall portion 221 of the sidewall 22 also has a second opening 242, which is located between the two first openings 241. When the elastic limiting member 50 is assembled to the first wall portion 221, the second protrusion 52 of the elastic limiting member 50 engages with the second opening 242. The elastic limiting member 50 can be positioned on the sidewall 22 by the engagement of the second protrusion 52 and the second opening 242 to facilitate assembly. In some embodiments, the area of ​​the second opening 242 is smaller than the area of ​​any one of the first openings 241.

[0090] like Figures 2 to 4 As shown, in some embodiments, the second portion 62 of the frame 60 may conceal the first opening 241 and the second opening 242 of the sidewall 22. In some embodiments, the first opening 241 of the sidewall 22 is a one-sided open notch structure to facilitate assembly.

[0091] like Figures 2 to 4As shown, in some embodiments, the elastic limiting member 50 further includes a baffle 56 connecting the body 53. When the elastic limiting member 50 is assembled to the first wall portion 221, the baffle 56 extends from the side of the body 53 away from the back plate 21 along a first direction D1 and is located between the third side 73 of the optical film 70 and the first wall portion 221 of the side wall 22, wherein the third side 73 of the optical film 70 corresponds to the first side 31 of the light guide plate 30. With the above configuration, when the display device 15 or the backlight module 19 shakes, the baffle 56 of the elastic limiting member 50 provides a barrier and buffer between the optical film 70 and the side wall 22 of the housing 20, preventing the optical film 70 from directly impacting the side wall 22 of the housing 20 and avoiding abnormal noise.

[0092] like Figures 2 to 4 As shown, in some embodiments, in the direction away from the back plate 21, the top of the baffle 56 of the resilient retainer 50 is substantially aligned with the top of the sidewall 22 of the housing 20. In some embodiments, one side of the baffle 56 abuts against the sidewall 22, and the other side is recessed relative to the body 53 in the third direction D3, with the third side 73 of the optical film 70 extending at least partially beyond the first side 31 of the light guide plate 30, and the recessed space of the baffle 56 accommodating the third side 73 of the optical film 70.

[0093] Please refer to the above as well. Figure 5 . Figure 5 For illustration Figure 1 The top view of the backlight module 19 housing 20, light guide plate 30, and elastic limiting member 50 of the display device 15 is shown. Figures 3 to 5 As shown, the light guide plate 30 also has a first groove 35, which is located on the first side 31 and engages with the body 53 of the elastic limiting member 50. In this way, the elastic limiting member 50 can limit the light guide plate 30 and prevent it from shifting.

[0094] like Figures 3 to 5 As shown, in some embodiments, the body 53 of the elastic limiting member 50 has at least one first rounded corner 57, and the first groove 35 of the light guide plate 30 has at least one second rounded corner 37, with the second rounded corner 37 abutting against the first rounded corner 57. In the illustrated embodiment, both corners of the body 53 of the elastic limiting member 50 facing the light guide plate 30 are rounded, and correspondingly, the first groove 35 of the light guide plate 30 has two second rounded corners 37. In some embodiments, in the second direction D2 extending from the first wall portion 221 of the sidewall 22, the maximum width of the first groove 35 of the light guide plate 30 is greater than the maximum width of the body 53 of the elastic limiting member 50. With the above configuration, the problem of gaps between the elastic limiting member 50 and the light guide plate 30 after thermal expansion and contraction can be improved, preventing displacement of the elastic limiting member 50 and the light guide plate 30, and also preventing abnormal noise when the display device 15 or the backlight module 19 is shaken.

[0095] like Figure 5 As shown, in some embodiments, the light guide plate 30 includes two first epitaxial structures 34 located on the first side 31 and on both sides of the first groove 35. In other words, the two first epitaxial structures 34 define the first groove 35. A second fillet 37 is located inside the first epitaxial structure 34. The second fillet 37 can avoid stress concentration and reduce the risk of breakage of the first epitaxial structure 34.

[0096] like Figure 5 As shown, in some embodiments, the two first extensional structures 34 extend into the two first openings 241 of the first wall portion 221, and are located outside the first protrusion 51 of the elastic limiting member 50. In this way, the cooperation between the first extensional structure 34 and the first opening 241 can also limit the light guide plate 30 and prevent the light guide plate 30 from shifting.

[0097] like Figure 5 As shown, in some embodiments, each of the two first epitaxial structures 34 has a ramp 36, which is located on the side of the two first epitaxial structures 34 away from the first groove 35. The design of the ramp 36 can improve the structural strength of the first epitaxial structure 34 and reduce the risk of the first epitaxial structure 34 breaking.

[0098] Please refer to Figure 6 . Figure 6 For illustration Figure 1 The figure shows a top view of the housing 20, optical diaphragm 70, and elastic limiting member 50 of the backlight module 19 of the display device 15. As shown, in some embodiments, the optical diaphragm 70 has a second groove 72 located on a third side 73 and engaging with the baffle 56 of the elastic limiting member 50. In this way, the elastic limiting member 50 can limit the optical diaphragm 70 and prevent it from shifting.

[0099] like Figure 6 As shown, in some embodiments, the optical diaphragm 70 includes two second epitaxial structures 74 located on the third side 73 and on both sides of the second groove 72; in other words, the two second epitaxial structures 74 define the second groove 72. The two second epitaxial structures 74 extend into the two first openings 241 of the first wall portion 221 and are located outside the first protrusion 51 of the elastic limiting member 50. In this way, the cooperation between the second epitaxial structures 74 and the first openings 241 can also limit the optical diaphragm 70, preventing displacement. In some embodiments, each of the two second epitaxial structures 74 has at least one third rounded corner 77, which can avoid stress concentration and reduce the risk of breakage of the second epitaxial structure 74. In some embodiments, the second epitaxial structures 74 of the optical diaphragm 70 are stacked with the first epitaxial structures 34 of the light guide plate 30.

[0100] Please refer to Figures 7 to 10 . Figure 7 A cross-sectional view of a backlight module 19A according to another embodiment of this disclosure is shown. Figure 8 For illustration Figure 7 The diagram shows the assembly of the housing 20A and the elastic limiting member 50A of the backlight module 19A. Figure 9 For illustration Figure 7 An exploded view of the housing 20A and the elastic limiting member 50A of the backlight module 19A shown. Figure 10 For illustration Figure 8 The backlight module 19A shown is a cross-sectional view of its housing 20A and elastic limiting member 50A at the mark of line segment 10-10'.

[0101] like Figures 7 to 10 As shown, the main differences between this embodiment and the aforementioned embodiments include: (1) The first wall portion 221A of the sidewall 22A has two first openings 241A and a second opening 242A, the second opening 242A being located between the two first openings 241A, and the area of ​​the second opening 242A being larger than the area of ​​any one of the first openings 241A; (2) The elastic limiting member 50A includes a body 53A, which is disposed between the first wall portion 221A of the sidewall 22A and the first side edge 31A of the light guide plate 30A. The main body 53A abuts against the first wall portion 221A and includes multiple supporting structures 54 abutting against the first side 31A of the light guide plate 30A; (3) The elastic limiting member 50A covers the second opening 242A of the side wall 22A. The elastic limiting member 50A also includes two protrusions 51A. The two protrusions 51A are connected to the main body 53A and respectively engage with the two first openings 241A of the side wall 22A to position the elastic limiting member 50A on the side wall 22A. In addition, under normal temperature conditions, the elastic limiting member 50A does not have a structure that extends into the second opening 242A. In this way, when the light guide plate 30A expands and squeezes the elastic limiting member 50A due to high temperature, the second opening 242A of the side wall 22A can provide space for the elastic limiting member 50A to be squeezed out and deformed, preventing the elastic limiting member 50A from flipping over and falling off the side wall 22A, or from arching the light guide plate 30A out of place and losing its function of fixing the light guide plate 30A.

[0102] In some embodiments, the backlight module 19A may include a plurality of elastic limiting members 50A disposed on a plurality of wall portions of the side wall 22A to correspondingly abut against a plurality of sides of the light guide plate 30A, for example, correspondingly abutting against a first side 31A of the light guide plate 30A away from the light source 40 and the other two sides adjacent to the first side 31A. In some embodiments, the backlight module 19A may include only a single elastic limiting member 50A disposed on one of the wall portions of the side wall 22A (e.g., the first wall portion 221A).

[0103] like Figures 7 to 10 As shown, in some embodiments, in a first direction D1 perpendicular to the back plate 21, the height of the second opening 242A of the first wall portion 221A of the side wall 22A is greater than the height of the body 53A of the elastic limit member 50A and less than the height of the baffle 56 of the elastic limit member 50A, so that the elastic limit member 50A can partially enter the second opening 242A when it is squeezed, and then reliably elastically reset.

[0104] like Figures 7 to 10 As shown, the supporting structure 54 is disposed on the side of the body 53A facing the light guide plate 30A and abuts against the light guide plate 30A. A groove 55 is provided between any two adjacent supporting structures 54. In other words, the body 53A of the elastic limiting member 50A has a concave-convex structure facing the light guide plate 30A. The first side 31A of the light guide plate 30A abuts against the body 53A of the elastic limiting member 50A. The first side 31A of the light guide plate 30A can be a straight side or other shapes. In some embodiments, the two outermost supporting structures 54 each have a slope 58, which is located outside the supporting structure 54. The above-mentioned structural configuration can increase the deformation degree of the elastic limiting member 50A, thus improving the gap change between the elastic limiting member 50A and the light guide plate 30A caused by thermal expansion and contraction, avoiding displacement of the elastic limiting member 50A and the light guide plate 30A, and also preventing abnormal noise when the display device 15 or the backlight module 19A is shaken, which is beneficial for the use of the display device 15 or the backlight module 19A in extreme environments.

[0105] like Figures 7 to 10As shown, in some embodiments, the body 53A of the elastic limiting member 50A includes two first abutment structures 541 and a second abutment structure 542, the two first abutment structures 541 and the second abutment structure 542 protruding from the body 53A, and the second abutment structure 542 being located between the two first abutment structures 541. The body 53A has an outer wall with a first wall portion 221A abutting against the side wall 22A. The vertical distance between the end of the second abutment structure 542 and the outer wall of the body 53A is distance L2, and the vertical distance between the end of the two first abutment structures 541 and the outer wall of the body 53A is distance L1. Distance L2 is greater than distance L1. In some embodiments, the first abutment structure 541 has a substantially trapezoidal shape. Specifically, the horizontal cross-section of the first abutment structure 541 (i.e., the cross-section perpendicular to the first direction D1) is trapezoidal. The second abutment structure 542 has a substantially triangular shape. Specifically, the horizontal cross-section of the second abutment structure 542 is approximately triangular. In some embodiments, the second supporting structure 542 is a support column on the side of the light guide plate 30A. When the light guide plate 30A is cooled and shrunk, the second supporting structure 542 can continuously abut against and support the light guide plate 30A, preventing the light guide plate 30A from falling off due to increased gaps. When the light guide plate 30A is heated and expanded, the second supporting structure 542 and the first supporting structure 541 can be compressed and deformed to both sides without arching the light guide plate 30A. In some embodiments, the position of the second supporting structure 542 corresponds to the second opening 242A of the first wall portion 221A of the side wall 22A, so the second supporting structure 542 can deform backward when compressed by the light guide plate 30A.

[0106] In some embodiments, the structures of the elastic limiting members 50 and 50A disclosed herein can be partially replaced. For example, the elastic limiting member 50 may have two protrusions 51A instead of the first protrusion 51 and the second protrusion 52, and the opening of the first wall portion 221 of the sidewall 22 may be adjusted accordingly. Alternatively, the elastic limiting member 50 may have two first bearing structures 541 and a second bearing structure 542 instead of the first rounded corner 57 of the body 53, and the first groove 35 and the second rounded corner 37 of the light guide plate 30 may be adjusted accordingly. In some embodiments, the elastic limiting members 50 and 50A can be used interchangeably in the display device 15, and the sidewall of the housing and the light guide plate can be provided with corresponding structures without affecting the operation of the display device 15.

[0107] In summary, the backlight module disclosed herein includes an elastic limiting member disposed between the light guide plate and the side wall of the housing, the elastic limiting member being used to fix the light guide plate. The above-described structural configuration of the light guide plate, elastic limiting member, and side wall helps improve the reliability of the backlight module, enabling its application in environments with large temperature variations and high vibration (e.g., vehicles).

[0108] Although this disclosure has been presented above with reference to embodiments, it is not intended to limit this disclosure. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of this disclosure. Therefore, the scope of protection of this disclosure shall be determined by the claims.

Claims

1. A backlight module, characterized by, Include: A housing includes a back plate and a side wall, the side wall including a first wall portion having two first openings; A light guide plate is disposed in the housing and has a first side edge, the first side edge corresponding to the first wall portion of the side wall; A light source is disposed in the housing and configured to emit light toward the light guide plate; as well as An elastic limiting member includes a body and two first protrusions. The body is disposed between the first wall portion of the sidewall and the first side edge of the light guide plate. The two first protrusions are integrally formed with the body and extend into the two first openings of the first wall portion respectively. The light guide plate also has a first groove located on the first side edge and engaging with the body of the elastic limiting member.

2. The backlight module as described in claim 1, characterized in that, The body of the elastic limiting member has at least one first rounded corner, and the first groove of the light guide plate has at least one second rounded corner, the at least one second rounded corner abutting against the at least one first rounded corner.

3. The backlight module as described in claim 2, characterized in that, In one direction extending from the first wall portion of the sidewall, the maximum width of the first groove of the light guide plate is greater than the maximum width of the body of the elastic limiting member.

4. The backlight module as described in claim 1, characterized in that, The light guide plate includes two first extension structures located on the first side and on both sides of the first groove. The two first extension structures extend into the two first openings of the first wall portion. Each of the two first extension structures has a slope located on the side of the two first extension structures away from the first groove.

5. The backlight module as described in claim 1, characterized in that, The elastic limiting member also includes a second protrusion located between the two first protrusions. The first wall portion of the sidewall also has a second opening located between the two first openings. The second protrusion engages with the second opening.

6. The backlight module as described in claim 1, characterized in that, The light guide plate also has a second side opposite to the first side, and the light source is configured to emit light toward the second side of the light guide plate.

7. The backlight module as described in claim 1, characterized in that, The light guide plate is further comprising an optical film disposed on the side of the light guide plate away from the back plate and having a third side edge corresponding to the first side edge of the light guide plate. The elastic limiting member further comprises a baffle extending from the side of the body away from the back plate and located between the third side edge of the optical film and the first wall portion of the sidewall.

8. The backlight module as described in claim 7, characterized in that, The optical film has a second groove located on the third side and engaging with the baffle of the elastic limiting member. The second groove has two second extension structures on both sides, which extend into the two first openings of the first wall.

9. A display device, characterized in that, Include: A display panel; and A backlight module is disposed on one side of the display panel and includes: A housing includes a back plate and a side wall, the side wall including a first wall portion having an opening; A light guide plate is disposed in the housing and has a first side edge, the first side edge corresponding to the first wall portion of the side wall; An optical film is disposed on the side of the light guide plate away from the back plate and has a third side edge corresponding to the first side edge of the light guide plate. A light source is disposed in the housing and configured to emit light toward the light guide plate; as well as An elastic limiting member covers the opening and includes a body and a baffle. The body is disposed between the first wall portion of the sidewall and the first side edge of the light guide plate and abuts against the first wall portion. The baffle extends from the side of the body away from the back plate and is located between the third side edge of the optical film and the first wall portion of the sidewall. The light guide plate also has a groove located on the first side edge and engages with the body of the elastic limiting member.

10. A display device, characterized in that, Include: A display panel; and A backlight module is disposed on one side of the display panel and includes: A housing includes a back plate and a side wall, the side wall including a first wall portion having two openings; A light guide plate is disposed in the housing and has a first side edge, the first side edge corresponding to the first wall portion of the side wall; An optical film is disposed on the side of the light guide plate away from the back plate and has a third side opposite to the first side of the light guide plate. A light source is disposed in the housing and configured to emit light toward the light guide plate; as well as An elastic limiting member includes a body, a baffle and two protrusions. The body is disposed between the first wall portion of the sidewall and the first side edge of the light guide plate. The baffle extends from the side of the body away from the back plate and is located between the third side edge of the optical film and the first wall portion of the sidewall. The two protrusions are integrally formed with the body and extend into the two openings of the first wall portion respectively.

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