Backlight module and display device

Abstract

The utility model discloses a backlight unit and display device belong to display technical field. The backlight unit includes backplate, light bar subassembly, light guide plate and antifriction subassembly, and the accommodation space is formed on the backplate, and light bar subassembly includes the circuit board of setting on the backplate, and light guide plate sets up in the accommodation space, and the light side of light guide plate corresponds with light bar subassembly, and antifriction subassembly includes the rolling element, and light guide plate and circuit board are contacted through the rolling element, and the rolling element can rotate simultaneously relative to light guide plate and circuit board. The backlight unit sets up antifriction subassembly, and light guide plate and circuit board are contacted through the rolling element, and the friction between two is rolling friction, even when the light guide plate expands due to heat, and the friction between light guide plate and circuit board is small, and the circuit board will not displace with the light guide plate, thereby ensure the stability of the setting position of light bar subassembly on the backplate, and then can guarantee the use performance of backlight unit and the whole display device's taste.

Description

Technical Field

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

[0002] Liquid crystal displays (LCDs) have gained widespread use due to their numerous advantages, including slim design, low power consumption, and no radiation. Most LCDs currently on the market are backlit, consisting of an LCD panel and a backlight module. The LCD panel works by placing liquid crystal molecules between two parallel glass substrates. Numerous fine vertical and horizontal wires connect the two substrates, controlling the orientation of the liquid crystal molecules by applying current, thus refracting light from the backlight module to create an image. Since the LCD panel itself does not emit light, it relies on the backlight module to display images; therefore, the backlight module is one of the key structural components of an LCD device.

[0003] like Figure 1 and Figure 2 As shown, the backlight module in the related technology typically includes a backplate 10', a light strip assembly 20', and a light guide plate 30'. Light emitted from the light strip assembly 20' enters the interior of the light guide plate 30' from the light-incident side 301', and through total internal reflection and scattering principles, the light is emitted from the light-outceasing side 302' of the light guide plate 30'. A rubber limiting block 40' is typically also provided in the accommodating space of the backplate 10'. The rubber limiting block 40' is located on the side of the light guide plate 30' facing away from the light strip assembly 20', with one end of the light guide plate 30' abutting against the FPC plate 21' of the light strip assembly 20', and the other end abutting against the rubber limiting block 40'. During thermal shock tests, the light guide plate 30' will undergo thermal expansion and contraction, and the rubber limiting block 40' can provide a certain displacement for the thermal expansion and contraction of the light guide plate 30'.

[0004] Specifically, such as Figure 2 As shown, when the light guide plate 30' expands due to heat, it expands simultaneously along both the X and Y directions. When the light guide plate 30' expands along the Y direction, it simultaneously presses against the FPC plate 21' and the rubber limiting block 40'. When the light guide plate 30' expands along the X direction, due to the deformation of the rubber limiting block 40' on the right side and the large frictional force between the light guide plate 30' and the FPC plate 21', the FPC plate 21' easily shifts to the right along with the light guide plate 30'. Figure 3As shown, when the light guide plate 30' contracts at low temperature, in the X direction, under the elastic restoring force of the rubber limiting block 40' located on the right, the light guide plate 30' will contract to the left. At this time, due to the contraction of the light guide plate 30' in the Y direction, the pressure between it and the FPC plate 21' decreases, and the friction decreases, so the FPC plate 21' will not shift to the left with the light guide plate 30' to reset. In other words, when the backlight module undergoes thermal shock testing, the lamp strip assembly 20' will shift with the thermal expansion and contraction of the light guide plate 30', thus affecting the overall appearance of the display device, the finished product quality of the display device, and reducing the user experience.

[0005] Therefore, there is an urgent need for a backlight module and display device to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to provide a backlight module and display device that can prevent the light strip assembly from shifting due to the thermal expansion and contraction of the light guide plate, thereby ensuring the finished product quality of the display device and improving the user experience.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A backlight module, comprising:

[0009] A back plate having an accommodating space formed thereon;

[0010] A light strip assembly, including a circuit board disposed on the back panel;

[0011] A light guide plate is disposed in the accommodating space, and the light-incident side of the light guide plate corresponds to the light strip assembly;

[0012] The friction-reducing component includes a rolling element, wherein the light guide plate and the circuit board are in contact through the rolling element, and the rolling element can rotate relative to both the light guide plate and the circuit board simultaneously.

[0013] As a preferred embodiment, the light strip assembly further includes a plurality of LEDs, the circuit board includes a main body and an extension, two of the extensions are respectively connected to the two ends of the main body, the plurality of LEDs are spaced apart on the main body along the X direction, the light guide plate has a protrusion corresponding to the extension on the side facing the light strip assembly, and the friction reduction component is located between the protrusion and the extension.

[0014] As a preferred embodiment, the friction-reducing component is mounted on the circuit board, and the friction-reducing component further includes a support base disposed on the extension, and the rolling element is rotatably disposed on the support base.

[0015] As a preferred embodiment, the cross-sectional shape of the rolling element is circular, the support base is provided with a first mounting groove, the rolling element is partially accommodated in the first mounting groove, the maximum depth L1 of the first mounting groove satisfies: R < L1 < D, and the opening width L2 of the first mounting groove is < D.

[0016] Wherein, D is the diameter of the circular cross-section of the rolling element, and R is the radius of the circular cross-section of the rolling element.

[0017] As a preferred embodiment, the protrusion is provided with a guide slope, which gradually slopes away from the light strip assembly along the X direction from the edge of the light guide plate to its center.

[0018] As a preferred embodiment, at least two rolling elements are provided between each extension and the corresponding protrusion.

[0019] As a preferred embodiment, the rolling element is rotatably mounted on the protrusion.

[0020] As a preferred embodiment, the cross-sectional shape of the rolling element is circular, and a second mounting groove is provided on the protrusion. The rolling element is partially accommodated in the second mounting groove, and the maximum depth L3 of the second mounting groove satisfies: R < L3 < D, and the opening width L4 of the second mounting groove is < D.

[0021] Wherein, D is the diameter of the circular cross-section of the rolling element, and R is the radius of the circular cross-section of the rolling element.

[0022] As a preferred embodiment, the rolling element is spherical or cylindrical.

[0023] This utility model also provides a display device, including a display panel and a backlight module as described above, wherein the backlight module is used to support the display panel and can provide a backlight source for the display panel.

[0024] The beneficial effects of this utility model are as follows:

[0025] The backlight module provided by this utility model, by setting a friction-reducing component, allows the light guide plate and the circuit board to contact each other through a rolling element, that is, the friction between the two is rolling friction. Even when the light guide plate expands due to heat, the circuit board will not shift with the light guide plate because the friction between the light guide plate and the circuit board is small. This ensures the stability of the lamp strip assembly's position on the back plate, thereby guaranteeing the performance of the backlight module and the overall quality of the display device, and improving the user experience.

[0026] The display device provided by this utility model, by applying the aforementioned backlight module, can avoid the thermal expansion and contraction of the light guide plate during thermal shock testing, which would cause the circuit board to move synchronously with the light guide plate, thereby ensuring the finished product quality of the display device and improving the user experience. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0028] Figure 1 This is a partial cross-sectional schematic diagram of a backlight module provided in related technologies;

[0029] Figure 2 This is one of the top views of a backlight module provided in related technologies;

[0030] Figure 3 This is the second top view of the backlight module provided in the related technology;

[0031] Figure 4 This is a partial cross-sectional schematic diagram of the backlight module provided in Embodiment 1 of this utility model;

[0032] Figure 5 This is a top view of the backlight module provided in Embodiment 1 of this utility model;

[0033] Figure 6 This is a schematic diagram of the structure of the light strip assembly and the friction-reducing assembly provided in Embodiment 1 of this utility model;

[0034] Figure 7 This is a cross-sectional view of the friction-reducing component provided in Embodiment 1 of this utility model;

[0035] Figure 8 This is a schematic diagram of the structure of the light strip assembly and the friction-reducing assembly provided in Embodiment 2 of this utility model;

[0036] Figure 9 This is a top view of the backlight module provided in Embodiment 3 of this utility model;

[0037] Figure 10 yes Figure 9 A schematic diagram of a partial structure;

[0038] Figure 11 This is a schematic diagram of the friction-reducing component provided in Embodiment 4 of this utility model;

[0039] Figure 12 This is a partial cross-sectional schematic diagram of the backlight module provided in Embodiment 5 of this utility model;

[0040] Figure 13 yes Figure 12 A magnified view of a portion at point A.

[0041] Figure label:

[0042] 10' Backplate; 20' Light strip assembly; 21' FPC board; 30' Light guide plate; 301' Light input side; 302' Light output side; 40' Rubber limiting block;

[0043] 10. Back panel; 101. Accommodation space; 11. Base panel; 12. Side panel;

[0044] 20. LED strip assembly; 21. Circuit board; 211. Main body; 212. Extension; 22. LED light;

[0045] 30. Light guide plate; 31. Protrusion; 310. Second mounting groove; 311. Guide slope;

[0046] 40. Friction-reducing component; 41. Rolling element; 42. Support base; 420. First mounting slot. Detailed Implementation

[0047] Before explaining any embodiment of the present invention in detail, it should be understood that the present invention is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0048] In this invention, the terms "comprising," "including," "having," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0049] In this invention, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "and / or" relationship.

[0050] In this invention, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0051] In this invention, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the value and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0052] In this invention, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can be performed by one part, one component, or a combination of multiple parts.

[0053] In this utility model, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this utility model. Furthermore, in the context, it should be understood that when one element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent the direct orientation but can also be understood as the lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0054] Example 1

[0055] Figure 4 A partial cross-sectional view of the backlight module provided in this embodiment is shown. Figure 5A top view of the backlight module provided in this embodiment is shown. Figures 4-5 As shown, this embodiment provides a backlight module, which includes a backplate 10, a light strip assembly 20, a light guide plate 30, and a friction-reducing component 40. The backplate 10 has an accommodating space 101. The light strip assembly 20 includes a circuit board 21 disposed on the backplate 10. The light guide plate 30 is disposed in the accommodating space 101, and the light-incident side of the light guide plate 30 corresponds to the light strip assembly 20. The friction-reducing component 40 includes a rolling element 41, and the light guide plate 30 and the circuit board 21 are in contact through the rolling element 41, and the rolling element 41 can rotate relative to the light guide plate 30 and the circuit board 21 simultaneously.

[0056] The backlight module provided in this embodiment, by setting the friction-reducing component 40, allows the light guide plate 30 and the circuit board 21 to contact each other through the rolling element 41, that is, the friction between the two is rolling friction. Even when the light guide plate 30 expands due to heat, the circuit board 21 will not be displaced with the light guide plate 30 because the friction between the light guide plate 30 and the circuit board 21 is small. This ensures the stability of the position of the light strip assembly 20 on the back plate 10, thereby ensuring the performance of the backlight module and the overall quality of the display device, and improving the user experience.

[0057] like Figure 4 As shown, the back panel 10 includes a base plate 11 and side plates 12 surrounding the base plate 11, with the base plate 11 and side plates 12 forming the aforementioned accommodating space 101. The circuit board 21 is connected to the side plate 12.

[0058] Figure 6 A schematic diagram of the structure of the light strip assembly 20 and the friction-reducing assembly 40 provided in this embodiment is shown. Figure 6 and combined Figure 5 As shown, the light strip assembly 20 also includes a plurality of LEDs 22. The circuit board 21 includes a main body 211 and an extension 212. Two extensions 212 are respectively connected to the two ends of the main body 211. The plurality of LEDs 22 are spaced apart on the main body 211 along the X direction. The light guide plate 30 has a protrusion 31 corresponding to the extension 212 on the side facing the light strip assembly 20. The friction-reducing component 40 is located between the protrusion 31 and the extension 212. By setting a plurality of LEDs 22 on the circuit board 21, the display brightness of the display device during use can be ensured. By setting the protrusion 31 on the light guide plate 30, a clearance groove is formed between two protrusions 31 to avoid the LEDs 22. When the light guide plate 30 expands due to heat, the clearance groove provides a safe space for the LEDs 22, which can prevent the light guide plate 30 from colliding with the LEDs 22 when it expands, thus avoiding damage to the LEDs 22 and improving the safety of the backlight module.

[0059] By dividing the circuit board 21 into a main body 211 and extensions 212 connected to both sides of the main body 211, it is equivalent to setting the friction-reducing component 40 on the outside of a plurality of LEDs 22. This avoids the problem that the spacing between two adjacent LEDs 22 is too small, which would make it inconvenient to install the friction-reducing component 40. It also prevents the protrusion 31 from colliding with the LEDs 22 when the light guide plate 30 expands due to heat, thus preventing damage to the LEDs 22. This further improves the safety of the backlight module.

[0060] It should be noted that the X direction specifically refers to the length direction of the circuit board 21, and the Y direction specifically refers to the thickness direction of the circuit board 21. That is to say, a number of LED lights 22 are arranged at intervals along the length direction of the circuit board 21 (specifically the main body 211).

[0061] In this embodiment, circuit board 21 is an FPC board. Of course, in other embodiments, circuit board 21 can also be a PCB board. It should be noted that FPC boards, PCB boards, and LED lights 22 are all existing technologies, and the specific structures, connection methods, and working principles of FPC boards, PCB boards, and LED lights 22 will not be described in detail in this embodiment.

[0062] like Figures 4-6 As shown, in this embodiment, the friction-reducing component 40 is mounted on the circuit board 21. The friction-reducing component 40 also includes a support base 42, which is disposed on the extension 212. The rolling element 41 is rotatably disposed on the support base 42. The rolling element 41 is mounted on the circuit board 21 via the support base 42, which avoids the problem that the rolling element 41 cannot be rotatably mounted due to the thinness of the circuit board 21.

[0063] In this embodiment, the support base 42 is welded to the extension 212. The welding process has the advantages of high connection strength and good structural reliability. Of course, this embodiment does not limit the connection method between the support base 42 and the extension 212. The two can also be connected by means such as adhesive, screw connection, snap-fit, etc.

[0064] Figure 7 A cross-sectional view of the friction-reducing assembly 40 provided in this embodiment is shown. To achieve the installation of the rolling element 41 and the support 42, as... Figure 7 As shown, the rolling element 41 has a circular cross-sectional shape, and a first mounting groove 420 is provided on the support base 42. The rolling element 41 is partially accommodated in the first mounting groove 420. The maximum depth L1 of the first mounting groove 420 satisfies: R < L1 < D, and the opening width L2 of the first mounting groove 420 < D; where D is the diameter of the circular cross-section of the rolling element 41, and R is the radius of the circular cross-section of the rolling element 41. This design allows the rolling element 41 to rotate freely in the first mounting groove 420 while preventing it from falling out of the first mounting groove 420.

[0065] In this embodiment, the rolling element 41 is spherical, which has a simple structure, is easy to process, and can achieve 360° free rotation. When installing the spherical rolling element 41 onto the support base 42, the rolling element 41 can be directly aligned with the opening of the first mounting groove 420 and pressed into the first mounting groove 420, making installation convenient and quick.

[0066] like Figure 5 and Figure 6 As shown, at least two rolling elements 41 are provided between each extension 212 and the corresponding protrusion 31. This design can increase the contact points between the friction-reducing component 40 and the protrusion 31, so as to further ensure the stable cooperation between the light guide plate 30, the friction-reducing component 40 and the circuit board 21, so that the force on each position on the protrusion 31 is uniform, and to prevent the light guide plate 30 from rotating relative to the circuit board 21 when it expands due to heat.

[0067] like Figure 6 As shown, in this embodiment, there are at least two support seats 42, with each rolling element 41 corresponding to one support seat 42. After the rolling element 41 and the corresponding support seat 42 are assembled, the assembled rolling element 41 and support seat 42 are then installed on the corresponding extension 212.

[0068] Example 2

[0069] This embodiment provides a backlight module. The specific structure of the backlight module is roughly the same as that of the backlight module in Embodiment 1. The difference is that the number of support seats 42 for each friction-reducing component 40 is different.

[0070] Figure 8 A schematic diagram of the structure of the light strip assembly 20 and the friction-reducing assembly 40 provided in this embodiment is shown. Figure 8 and combined Figure 5 As shown, each extension 212 is provided with a support base 42, and all the rolling elements 41 corresponding to each extension 212 are disposed on the same support base 42. That is, the support base 42 is provided with a first mounting groove 420 corresponding to each rolling element 41. This design can simplify the installation between the friction reduction component 40 and the circuit board 21, that is, only one support base 42 needs to be soldered on each extension 212, which can improve the assembly efficiency of the backlight module to a certain extent.

[0071] Example 3

[0072] This embodiment provides a backlight module whose specific structure is roughly the same as that of the backlight module in Embodiment 1, except that the shape of the protrusion 31 is different.

[0073] Figure 9 A top view of the backlight module provided in this embodiment is shown. Figure 10 It shows Figure 9 A schematic diagram of a local structure. (For example...) Figures 9-10 As shown, a guide slope 311 is provided on the protrusion 31. The guide slope 311 gradually slopes away from the edge of the light guide plate 30 and towards its center in the X direction. By providing the guide slope 311 on the protrusion 31, the guide slope 311 can always maintain contact with the rolling element 41 during the thermal expansion and contraction of the light guide plate 30, thereby limiting the position of the light guide plate 30 and preventing displacement of the light guide plate 30 when the backlight module vibrates, which would affect the display quality of the display device.

[0074] It is understood that designers may provide guide slope 311 on only one of the protrusions 31 or on both protrusions 31, depending on actual processing requirements. This embodiment does not limit this.

[0075] Example 4

[0076] This embodiment provides a backlight module whose specific structure is roughly the same as that of the backlight module in Embodiment 1, except that the shape of the rolling element 41 is different.

[0077] Figure 11 A schematic diagram of the structure of the friction-reducing component 40 provided in this embodiment is shown. Figure 11 As shown, in this embodiment, the rolling element 41 has a cylindrical structure, and the rotation axis of the rolling element 41 extends along the thickness direction of the light guide plate 30, that is, the protrusion 31 of the light guide plate 30 rolls in contact with the arc-shaped side of the cylindrical rolling element 41.

[0078] It should be noted that, in this embodiment, the diameter D of the circular cross-section of the rolling element 41 is the diameter of the bottom surface of the cylindrical rolling element 41, and the radius R of the circular cross-section of the rolling element 41 is the radius of the bottom surface of the cylindrical rolling element 41.

[0079] Example 5

[0080] This embodiment provides a backlight module. The specific structure of the backlight module is roughly the same as that of the backlight module in Embodiment 1, except that the position of the friction reduction component 40 is different.

[0081] Figure 12 A partial cross-sectional view of the backlight module provided in this embodiment is shown. Figure 13 It shows Figure 12 A magnified view of a portion at point A. (See attached image.) Figures 12-13As shown, in this embodiment, the friction-reducing component 40 is disposed on the protrusion 31 of the light guide plate 30. That is, the rolling element 41 is rotatably mounted on the protrusion 31. This arrangement can omit the support base 42, simplify the assembly process, and at the same time reduce the material cost of the backlight module to a certain extent.

[0082] like Figure 13 As shown, the rolling element 41 has a circular cross-sectional shape, and a second mounting groove 310 is provided on the protrusion 31. The rolling element 41 is partially accommodated in the second mounting groove 310. The maximum depth L3 of the second mounting groove 310 satisfies: R < L3 < D, and the opening width L4 of the second mounting groove 310 < D; where D is the diameter of the circular cross-section of the rolling element 41, and R is the radius of the circular cross-section of the rolling element 41. This design allows the rolling element 41 to rotate freely in the second mounting groove 310 while preventing it from falling out of the second mounting groove 310.

[0083] In this embodiment, the shape of the rolling element 41 is not limited; it can be spherical or cylindrical. When the rolling element 41 is spherical, it also facilitates the assembly of the light guide plate 30 and the back plate 10.

[0084] It should be noted that when the rolling element 41 is spherical, the diameter D of the circular cross-section of the rolling element 41 is the diameter of the spherical rolling element 41, and the radius R of the circular cross-section of the rolling element 41 is the radius of the spherical rolling element 41; when the rolling element 41 is cylindrical, the diameter D of the circular cross-section of the rolling element 41 is the diameter of the bottom surface of the cylindrical rolling element 41, and the radius R of the circular cross-section of the rolling element 41 is the radius of the bottom surface of the cylindrical rolling element 41.

[0085] Example 6

[0086] This embodiment provides a display device, which includes a display panel and a backlight module. The backlight module supports the display panel and provides a backlight source for the display panel. The backlight module can be any one of the backlight modules described in Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, or Embodiment 5. By using the aforementioned backlight module, the thermal expansion and contraction of the light guide plate 30 during thermal shock testing can be avoided, preventing the circuit board 21 from moving synchronously with the light guide plate 30. This ensures the finished product quality of the display device and improves the user experience.

[0087] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments do not limit this utility model in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A backlight module, characterized in that, include: Back plate (10), on which an accommodating space (101) is formed; The light strip assembly (20) includes a circuit board (21) disposed on the back plate (10); A light guide plate (30) is disposed in the accommodating space (101), and the light-incident side (301) of the light guide plate (30) corresponds to the light strip assembly (20); The friction reduction assembly (40) includes a rolling element (41), the light guide plate (30) and the circuit board (21) are in contact through the rolling element (41), and the rolling element (41) can rotate relative to the light guide plate (30) and the circuit board (21) at the same time.

2. The backlight module according to claim 1, characterized in that, The light strip assembly (20) also includes a plurality of LED lights (22). The circuit board (21) includes a main body (211) and an extension (212). Two extensions (212) are respectively connected to the two ends of the main body (211). A plurality of LED lights (22) are spaced apart on the main body (211) along the X direction. The light guide plate (30) has a protrusion (31) corresponding to the extension (212) on one side facing the light strip assembly (20). The friction reduction component (40) is located between the protrusion (31) and the extension (212).

3. The backlight module according to claim 2, characterized in that, The friction reduction component (40) is mounted on the circuit board (21). The friction reduction component (40) also includes a support base (42), which is disposed on the extension (212). The rolling element (41) is rotatably disposed on the support base (42).

4. The backlight module according to claim 3, characterized in that, The rolling element (41) has a circular cross-sectional shape. The support base (42) is provided with a first mounting groove (420). The rolling element (41) is partially housed in the first mounting groove (420). The maximum depth L1 of the first mounting groove (420) satisfies: R < L1 < D, and the opening width L2 of the first mounting groove (420) is < D. Wherein, D is the diameter of the circular cross-section of the rolling element (41), and R is the radius of the circular cross-section of the rolling element (41).

5. The backlight module according to claim 3, characterized in that, The protrusion (31) is provided with a guide slope (311), which gradually slopes away from the light bar assembly (20) along the X direction from the edge of the light guide plate (30) to its center.

6. The backlight module according to claim 2, characterized in that, At least two rolling elements (41) are provided between each of the extensions (212) and the corresponding protrusions (31).

7. The backlight module according to claim 2, characterized in that, The rolling element (41) is rotatably mounted on the protrusion (31).

8. The backlight module according to claim 6, characterized in that, The cross-sectional shape of the rolling element (41) is circular, and a second mounting groove (310) is provided on the protrusion (31). The rolling element (41) is partially accommodated in the second mounting groove (310). The maximum depth L3 of the second mounting groove (310) satisfies: R < L3 < D, and the opening width L4 of the second mounting groove (310) is < D. Wherein, D is the diameter of the circular cross-section of the rolling element (41), and R is the radius of the circular cross-section of the rolling element (41).

9. The backlight module according to any one of claims 1 to 8, characterized in that, The rolling element (41) is spherical or cylindrical.

10. A display device, characterized in that, It includes a display panel and a backlight module as described in any one of claims 1 to 9, wherein the backlight module is used to support the display panel and can provide a backlight source for the display panel.

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