Backlight module and display device

Abstract

The utility model provides a backlight module and a display device, and the backlight module comprises a diffusion plate which is located on the backlight side of a display panel; the back plate comprises a bottom plate part and a side plate part, the bottom plate part is located on the side, away from the display panel, of the diffusion plate, and the side plate part surrounds the periphery of the diffusion plate; the limiting pieces are arranged on the periphery of the diffusion plate and used for limiting the diffusion plate in a space defined by the bottom plate part and the side plate part; the limiting piece comprises a connecting part connected to the side plate part and an elastic limiting part connected to the connecting part, and the elastic limiting part is located between the side plate part and the diffusion plate in the direction from the side plate part to the diffusion plate; and in the direction from the side plate part to the diffusion plate, the elastic limiting part can generate elastic deformation under the acting force applied by the diffusion plate so as to limit the offset of the diffusion plate. According to the backlight module and the display device provided by the embodiment of the invention, the display effect can be improved.

Description

Technical Field

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

[0002] With the advancement of liquid crystal display technology, backlight sources are increasingly using micro-light-emitting diodes (Mini-LED). For ultra-thin, low-cost Mini-LED products, the use of printed diffuser technology can effectively reduce product thickness and the number of LEDs, thereby achieving ultra-thin, low-cost Mini-LED displays. However, the offset between the printed diffuser and the LED will affect the display effect. Utility Model Content

[0003] The embodiments of the present disclosure provide a backlight module and a display device, which can improve the display effect.

[0004] The technical solutions provided by the embodiments of the present disclosure are as follows:

[0005] In a first aspect, an embodiment of the present disclosure provides a backlight module for providing backlight for a display panel, wherein the display panel includes a display side and a backlight side disposed opposite to each other; the backlight module includes:

[0006] A diffusion plate, located on the backlight side of the display panel;

[0007] a back plate, comprising a bottom plate portion and a side plate portion, wherein the bottom plate portion is located on a side of the diffusion plate away from the display panel, and the side plate portion surrounds the periphery of the diffusion plate; and

[0008] A plurality of limiting members are arranged around the diffusion plate, and are used to limit the diffusion plate within the space enclosed by the bottom plate portion and the side plate portion; wherein,

[0009] The limiting member comprises a connecting portion connected to the side plate portion, and an elastic limiting portion connected to the connecting portion, wherein in a direction from the side plate portion to the diffuser plate, the elastic limiting portion is located between the side plate portion and the diffuser plate;

[0010] Furthermore, in a direction from the side plate portion to the diffusion plate, the elastic limiting portion can be elastically deformed under the force applied by the diffusion plate to limit the offset of the diffusion plate.

[0011] Exemplarily, the limiting member is a metal limiting member made of metal material.

[0012] Exemplarily, the side panel portion includes a first edge, which is an edge of the side panel portion in a direction from the backlight side to the display side and located away from the bottom panel portion; the connecting portion includes a first clamping portion, a second clamping portion and a connecting portion, and the connecting portion is connected between the first clamping portion and the second clamping portion so that the first clamping portion, the second clamping portion and the connecting portion are combined to form a clamping groove; wherein the opening of the clamping groove faces the side where the bottom panel portion is located and is clamped on the first edge.

[0013] Exemplarily, the side panel portion also includes an inner side surface and an outer side surface which are arranged opposite to each other along a direction pointing from the side panel portion to the diffuser plate, the inner side surface is located on a side of the outer side surface close to the diffuser plate, the first clamping portion is located on a side of the inner side surface close to the diffuser plate, and the second clamping portion is located on a side of the outer side surface away from the diffuser plate; a first clamping portion is provided on one of the outer side surface and the second clamping portion, and a second clamping portion is provided on the other, and the first clamping portion is clamped and connected with the second clamping portion.

[0014] Exemplarily, the first engaging portion includes an engaging protrusion or an engaging elastic sheet, and the second engaging portion includes an engaging groove or an engaging hole, and the engaging protrusion or the engaging elastic sheet is engaged in the engaging groove or the engaging hole.

[0015] Exemplarily, an avoidance groove is provided on the peripheral side surface of the diffuser plate at a position corresponding to the limiting member; in the direction from the side plate portion to the diffuser plate, one end of the elastic limiting portion close to the diffuser plate at least partially extends into the corresponding avoidance groove.

[0016] Exemplarily, in a direction from the side plate portion to the diffuser plate, a groove depth b of the avoidance groove is greater than a maximum allowable offset a of the diffuser plate in a direction from the side plate portion to the diffuser plate.

[0017] Exemplarily, the elastic limiting portion includes a spring sheet, which is connected to the connecting portion and extends and tilts toward the side where the diffusion plate is located, so that the spring sheet can be squeezed and elastically deformed by the force applied by the diffusion plate.

[0018] Exemplarily, the spring sheet is configured to extend obliquely relative to the side panel portion, and the inclination angle θ relative to the side panel portion is greater than or equal to 30° and less than or equal to 50°, and the length L of the spring sheet along its own extension direction is equal to H / sinθ, where H is the height of the spring sheet in the direction from the side panel portion to the diffuser.

[0019] Exemplarily, the elastic limiting portion further includes a resting platform for contacting and resting against the diffusion plate, wherein the resting platform is connected to a side of the elastic sheet close to the diffusion plate and is arranged parallel to the side plate portion.

[0020] Exemplarily, the limiting member also includes a stop limiting member for stopping and limiting the diffuser plate, and in the direction from the side panel portion to the diffuser plate, the stop limiting member is connected to the connecting portion and is located between the side panel portion and the diffuser plate; and in the direction from the side panel portion to the diffuser plate, the elastic limiting portion has a first height H, and the stop limiting member has a second height h, and the first height H is greater than the second height h.

[0021] Exemplarily, the backlight module also includes an inner frame glue, which is arranged in the space enclosed by the bottom plate portion and the side plate portion, and in the direction from the side plate portion to the diffusion plate, the inner frame glue has a first width C, and the second height h is less than or equal to the first width C.

[0022] Exemplarily, in the direction from the side plate portion to the diffuser plate, the distance between the stop limit member and the bottom of the avoidance groove is equal to the maximum allowable offset a of the diffuser plate in the direction from the side plate portion to the diffuser plate, and in the direction from the side plate portion to the diffuser plate, the first height H of the elastic limiting portion satisfies the following relationship: H=a+h.

[0023] Exemplarily, the second height h and the first width C satisfy the following relationship: 1 / 2≤h / C≤2 / 3.

[0024] In a second aspect, an embodiment of the present disclosure provides a display device, comprising the backlight module as described above.

[0025] The beneficial effects brought by the embodiments of the present disclosure are as follows:

[0026] The backlight module and display device provided in the embodiments of the present disclosure include a diffuser plate and a back plate, and a plurality of limiters are arranged around the diffuser plate to limit the position of the diffuser plate, wherein the limiter is constructed to include a connecting portion and an elastic limiter portion, the connecting portion can be connected to the back plate, the elastic limiter portion can be located between the side plate portion of the back plate and the diffuser plate, and the elastic limiter portion can limit the displacement of the diffuser plate by elastic deformation when in contact with the diffuser plate. In this way, compared with the solution of gapless contact alignment between the rubber part and the diffuser plate in the related art, the embodiment of the present disclosure can reserve a certain expansion gap for the diffuser plate through the elastic deformation of the elastic limiter portion to prevent the diffuser plate from being deformed due to long-term stress, and when the diffuser plate is offset, the offset of the diffuser plate can be limited by the elastic limiter portion to ensure that the alignment accuracy is within the target range, thereby ensuring the display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 An exploded view showing the structure of a backlight module provided in an embodiment of the present disclosure;

[0028] Figure 2 A schematic diagram showing a partial structure of a backlight module provided in an embodiment of the present disclosure;

[0029] Figure 3 One of the structural schematic diagrams of the position-limiting member in the backlight module provided in the embodiment of the present disclosure is shown;

[0030] Figure 4 A second structural schematic diagram showing a position-limiting member in a backlight module provided in an embodiment of the present disclosure;

[0031] Figure 5 The second schematic diagram of the partial structure of the backlight module provided in the embodiment of the present disclosure. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0033] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] Before describing the embodiments of the present disclosure in detail, the following description is given of the related technologies:

[0035] In related technologies, with the rapid development of the Mini LED industry, the demand for ultra-thin, low-cost products is increasing. Printed diffusion plate technology can effectively reduce product thickness and the number of LEDs, thereby achieving ultra-thin, low-cost mini LED displays. However, this is accompanied by display effect problems caused by alignment offset.

[0036] There are certain alignment accuracy design requirements between the dots of the printed diffuser and the LEDs. For example, the horizontal and vertical directions are both ≤1mm. In the related art, in order to prevent the diffuser from shifting and reserve an expansion gap for the diffuser, double-sided tape is used to stick limiting rubber parts (rubber) at the four corners of the back plate to ensure the alignment accuracy between the dots on the diffuser and the LEDs.

[0037] However, the inventors of the present application have found through research that the use of the above-mentioned rubber member to limit the diffusion plate still has the following problems:

[0038] The rubber part is made of a relatively soft material and is easily deformed by force. Considering the limit of the alignment accuracy, the offset is relatively small. For example, the maximum allowable offset is 1mm. After the expansion of the diffusion plate squeezes the rubber part, the offset between the center of the dot and the LED exceeds the maximum allowable offset, resulting in abnormal display effect. In addition, considering the display effect and the internal space of the module, the size of the rubber part is generally designed to be small, for example, about 10mm long and only about 1mm wide, with basically no operating space, making production line operation difficult and extremely inefficient. In addition, when the module is lit, especially when working at peak brightness, the local temperature can reach more than 60°C, and the double-sided tape used to stick the rubber part is prone to melting. After being squeezed and falling off by force, the diffusion plate can no longer be effectively limited, resulting in the diffusion plate being able to move at will, the dots of the diffusion plate being seriously offset from the center of the LED, and the display effect being abnormal. In addition, when the module is lit, the diffusion plate expands due to heat and directly squeezes the rubber part. Since the contact surface between the diffusion plate and the rubber part is small, the rubber part is easily squeezed and falls off, resulting in dot alignment offset and abnormal display effect, such as the appearance of light and dark stripes on the screen.

[0039] In order to solve at least one of the above problems, the backlight module and the display device provided in the embodiments of the present disclosure can improve the alignment accuracy of the diffusion plate and improve the display quality.

[0040] The backlight module provided in the embodiment of the present disclosure is used to provide backlight for a display panel, and the display panel includes a display side and a backlight side that are arranged opposite to each other.

[0041] like Figure 1 and Figure 2 As shown, the backlight module provided in the embodiment of the present disclosure includes:

[0042] A diffusion plate 100, located at the backlight side of the display panel;

[0043] A back plate 200, comprising a bottom plate portion 210 and a side plate portion 220, wherein the bottom plate portion 210 is located at a side of the diffuser plate 100 away from the display panel, and the side plate portion 220 surrounds the periphery of the diffuser plate 100; and

[0044] A plurality of stoppers 300 are arranged around the diffuser 100 to limit the diffuser 100 within the space enclosed by the bottom plate portion 210 and the side plate portion 220; wherein,

[0045] The limiting member 300 includes a connecting portion 310 connected to the side panel portion 220, and an elastic limiting portion 320 connected to the connecting portion 310. In the direction from the side panel portion 220 to the diffuser plate 100, the elastic limiting portion 320 is located between the side panel portion 220 and the diffuser plate 100; and in the direction from the side panel portion 220 to the diffuser plate 100, the elastic limiting portion 320 can be elastically deformed under the force applied by the diffuser plate 100 to limit the offset of the diffuser plate 100.

[0046] In the above scheme, a plurality of limiting members 300 are arranged around the diffuser plate 100 to limit the diffuser plate 100, wherein the limiting member 300 is constructed to include a connecting portion 310 and an elastic limiting portion 320, the connecting portion 310 can be connected to the back plate 200, the elastic limiting portion 320 can be located between the side plate portion 220 of the back plate 200 and the diffuser plate 100, and the elastic limiting portion 320 can maintain a gap with the diffuser plate 100, and limit the displacement of the diffuser plate 100 by elastic deformation when contacting the diffuser plate 100. In this way, compared with the solution in the related art in which the diffuser plate 100 adopts a gapless contact alignment between the rubber part and the diffuser plate 100, the elastic deformation of the elastic limiting part 320 in the embodiment of the present disclosure can reserve a certain expansion gap for the diffuser plate 100 to prevent the diffuser plate 100 from being deformed due to long-term stress. In addition, when the diffuser plate 100 is offset, the offset amount of the diffuser plate 100 can be limited by the elastic limiting part 320.

[0047] In some embodiments, the backlight module further includes a lamp board 600, which can be disposed between the diffuser plate 100 and the bottom plate portion 210, and a plurality of LED elements can be distributed in an array on the lamp board 600. A dot pattern can be provided on the diffuser plate 100, and the dot pattern can include a plurality of sub-dot areas, and each of the sub-dot areas corresponds to one of the LED elements.

[0048] The maximum allowable offset a of the diffusion plate 100 , ie, the limit offset, may refer to the maximum offset of the diffusion plate 100 relative to the LEDs on the light board 600 when light and dark stripes appear on the screen.

[0049] In some exemplary embodiments, the stopper 300 is a metal stopper 300 made of metal material. In the related art, the material of the rubber part used to limit the diffuser plate 100 has poor high temperature resistance, and the rubber material is relatively soft and easily deformed under force. After the expansion and squeezing of the rubber part by the diffuser plate 100, the offset between the dots on the diffuser plate 100 and the center of the LED will exceed the maximum allowable offset a, resulting in abnormal display effect. In the embodiment of the present disclosure, the stopper 300 is made of metal material, which is more resistant to high temperature and less deformed than rubber material. The gap between the diffuser plate 100 and the elastic stopper 320 can be designed based on the maximum allowable offset a, thereby reducing the degree of offset of the diffuser plate 100 and ensuring the display effect.

[0050] In some exemplary embodiments, the connecting portion 310 can be connected to the back panel 200 by snapping. Compared with the method of attaching the rubber part to the back panel 200 by double-sided tape in the related art, there is no problem of the double-sided tape melting due to heat, causing the rubber part to fall off and difficult assembly.

[0051] Specifically, in some exemplary embodiments, Figures 2 to 4 As shown, the side panel portion 220 includes a first edge 221, and the first edge 221 is an edge of the side panel portion 220 in the direction from the backlight side to the display side and located away from the bottom panel portion 210; the connecting portion 310 includes a first clamping portion 311, a second clamping portion 312 and a connecting portion 313, and the connecting portion 313 is connected between the first clamping portion 311 and the second clamping portion 312, so that the first clamping portion 311, the second clamping portion 312 and the connecting portion 313 are enclosed to form a clamping groove; wherein, the opening of the clamping groove faces the side where the bottom panel portion 210 is located, and is clamped on the first edge 221.

[0052] By adopting the above scheme, the connecting part 310 is constructed to include a locking groove formed by the first clamping part 311, the second clamping part 312 and the connecting part 313, and the opening of the locking groove faces the side where the bottom plate part 210 is located, and is locked on the first edge 221 of the side part away from the bottom plate part 210. In this way, the locking assembly is more convenient.

[0053] Exemplarily, the first clamping portion 311, the second clamping portion 312 and the connecting portion 313 are connected to form a U-shaped clamping groove. For example, the side panel portion 220 also includes an inner side surface 222 and an outer side surface 223 that are arranged opposite to each other along the direction from the side panel portion 220 to the diffuser plate 100, and the inner side surface 222 is located on the side of the outer side surface 223 close to the diffuser plate 100. The first clamping portion 311 and the second clamping portion 312 can be a sheet-like structure with a relatively thin thickness, which is clamped on the inner side surface 222 and the outer side surface 223 of the side panel portion 220, so that less space is occupied and the requirements of module assembly size and the like are met. It can be understood that the clamping method of the connecting portion 310 is not limited to this.

[0054] In some exemplary embodiments, Figures 2 to 4 As shown, the first clamping portion 311 is located on the side of the inner side surface 222 close to the diffuser plate 100, and the second clamping portion 312 is located on the side of the outer side surface 223 away from the diffuser plate 100; a first clamping portion S1 is provided on one of the outer side surface 223 and the second clamping portion 312, and a second clamping portion S2 is provided on the other, and the first clamping portion S1 is clamped and connected with the second clamping portion S2.

[0055] Exemplarily, the first engaging portion S1 includes an engaging protrusion or an engaging elastic sheet, and the second engaging portion S2 includes an engaging groove or an engaging hole, and the engaging protrusion or the engaging elastic sheet is engaged in the engaging groove or the engaging hole.

[0056] In a specific embodiment, the second holding portion 312 is provided with the engaging groove or engaging hole, and the outer side surface 223 of the side plate portion 220 is provided with the engaging protrusion or engaging spring. In this way, when the connecting portion 310 is assembled to the back plate 200, the opening of the engaging groove can be directed toward the side where the bottom plate portion 210 is located, and the engaging protrusion or engaging spring can be inserted into the first edge 221 of the side plate portion 220. At this time, the engaging protrusion or engaging spring is engaged with the engaging groove or engaging hole, and the process of assembling the limiting member 300 to the back plate 200 is completed, and the assembly and disassembly is convenient.

[0057] It can be understood that the specific structure of the first engaging portion S1 is not limited to an engaging protrusion or an engaging spring, and the specific structure of the second engaging portion S2 is not limited to an engaging groove or an engaging hole.

[0058] In some embodiments, taking the first engaging portion S1 as an engaging protrusion and the second engaging portion S2 as an engaging hole as an example, the size of the engaging hole is slightly larger than the size of the engaging protrusion, so that a certain gap can be maintained between the engaging protrusion and the engaging hole. Exemplarily, the gap between the engaging protrusion and the engaging hole can be about 1 mm, but is not limited thereto.

[0059] In addition, in some embodiments, the size of the engaging groove composed of the first holding portion 311, the second holding portion 312 and the connecting portion 313 may be 12 mm in length along the extending direction of the first edge 221 and 8 mm in width in a direction parallel to the side plate portion 220. Of course, it can be understood that the above is only an example, and the specific size design of the connecting portion 310 is not limited thereto.

[0060] Furthermore, in some exemplary embodiments, Figure 2 and Figure 5 As shown, the peripheral side surface of the diffuser plate 100 is provided with an avoidance groove 110 at a position corresponding to the limiting member 300; in the direction from the side plate portion 220 to the diffuser plate 100, one end of the elastic limiting portion 320 close to the diffuser plate 100 at least partially extends into the corresponding avoidance groove 110.

[0061] By adopting the above solution, the elastic limiting portion 320 can partially extend into the avoidance groove 110 , which can meet the assembly space requirement on the one hand, and on the other hand, the avoidance groove 110 can also limit the elastic limiting portion 320 .

[0062] And, if Figure 1 and Figure 5 As shown, in some embodiments, the back plate 200 module further includes an inner frame glue 400, which is disposed in the space enclosed by the bottom plate portion 210 and the side plate portion 220, and in the direction from the side plate portion 220 to the diffuser 100, the inner frame glue 400 has a first width C, and in the direction from the side plate portion 220 to the diffuser 100, the gap d between the peripheral side surface of the diffuser 100 and the side plate portion, wherein d is smaller than C. In this way, the edge of the diffuser 100 can overlap with the inner frame glue 400, and the overlap has an effective width, so that the inner frame glue 400 can support the edge of the diffuser 100.

[0063] In some exemplary embodiments, Figure 2 and Figure 5As shown, in the direction from the side panel portion 220 to the diffuser 100, the groove depth b of the avoidance groove 110 is greater than the maximum allowable offset a of the diffuser 100 in the direction from the side panel portion 220 to the diffuser 100. In this way, it can be ensured that there is an effective overlap width between the diffuser 100 and the inner frame glue 400 to avoid collapse at the edge of the diffuser 100. It should be noted that the maximum allowable offset a, that is, the limit offset, can refer to the maximum offset of the diffuser 100 relative to the LED on the light board 600 when the screen just makes light and dark stripes appear.

[0064] By adopting the above solution, the compression amount of the elastic limiting part 320 (ie, the offset amount of the diffuser plate 100 ) can be limited by setting the groove depth of the avoidance groove 110 , so as to ensure the alignment accuracy of the diffuser plate 100 and the light board 600 .

[0065] In some exemplary embodiments, Figures 2 to 5 As shown, the elastic limiting portion 320 may include a spring sheet 321, which is connected to the connecting portion 310 and extends and tilts toward the side where the diffuser plate 100 is located, so that the spring sheet 321 can be squeezed and elastically deformed by the force applied by the diffuser plate 100.

[0066] Exemplarily, the spring piece 321 may be made of metal and connected to the connecting portion 310. It is understandable that the spring piece 321 and the connecting portion 310 may also be made of any other suitable material such as high temperature resistant plastic.

[0067] In some exemplary embodiments, considering actual design requirements, such as Figure 5 As shown, the elastic sheet 321 is configured to extend obliquely relative to the side plate portion 220 , and the inclination angle θ relative to the side plate portion 220 is greater than or equal to 30° and less than or equal to 50°.

[0068] The tilt angle θ≥30° can prevent the elastic sheet 321 from being deformed significantly during transportation and assembly, and the tilt angle θ≤50° of the elastic sheet 321 is conducive to the expansion and compression of the diffuser plate 100 when the actual module is lit, thereby releasing the expansion stress of the diffuser plate 100. In addition, design space can be reserved for subsequent module design gaps.

[0069] It is understandable that, in practical applications, the size of the tilt angle θ can be reasonably selected according to actual needs in combination with the material and thickness of the spring piece 321 .

[0070] It should be noted that when the spring sheet 321 is elastically deformed by the force applied by the diffuser plate 100, the end thereof close to the diffuser plate 100 will slide in the avoidance groove 110, and the side wall of the avoidance groove 110 can limit the sliding travel of the end of the spring sheet 321 close to the diffuser plate 100.

[0071] In some exemplary embodiments, Figure 5 As shown, the length L of the elastic sheet 321 along its own extending direction is less than H / sinθ, where H is the height of the elastic sheet in the direction from the side plate portion to the diffusion plate.

[0072] In some exemplary embodiments, Figures 2 to 5 As shown, the elastic limiting portion 320 further includes a resting platform 322 for contacting and resting against the diffuser plate 100, the resting platform 322 is connected to the side of the spring sheet 321 close to the diffuser plate 100, and is arranged parallel to the side plate portion 220. In this way, by providing the resting platform 322, the resting platform 322 and the groove bottom of the avoidance groove 110 are in surface contact, the contact area between the spring sheet 321 and the avoidance groove 110 is increased, and the reliability of the spring sheet 321 can be increased.

[0073] In some exemplary embodiments, Figures 2 to 5 As shown, the limiting member 300 also includes a stopping and limiting member 500 for stopping and limiting the diffuser plate 100. In the direction from the side panel portion 220 to the diffuser plate 100, the stopping and limiting member 500 is connected to the connecting portion 310 and is located between the side panel portion 220 and the diffuser plate 100. In the direction from the side panel portion 220 to the diffuser plate 100, the elastic limiting portion has a first height H, and the stopping and limiting member 500 has a second height h, and the first height H is greater than the second height h.

[0074] By adopting the above solution, the displacement of the diffuser plate 100 can be further limited by providing the stopper 500 , so as to prevent the elastic sheet 321 from deforming too much and causing the displacement of the diffuser plate 100 to be too large.

[0075] And in some embodiments, since the inner frame glue 400 has a first width C in the direction from the side panel portion 220 to the diffuser plate 100, in order to ensure that no obvious outline features of the spring piece 321 appear on the actual display edge, the second height h is less than or equal to the first width C.

[0076] In some embodiments, the first width C may be greater than or equal to 1.5 mm, but is not limited thereto. It should be noted that the specific value of the first width C is affected by the design of the display area size and the backplane size of the display panel. The closer the value of the first width C is to 1.5 mm, the better the appearance of the whole device. However, it is not limited thereto. For example, in some embodiments, the first width C may also be about 5 mm.

[0077] In some exemplary embodiments, Figure 5 As shown, in the direction from the side plate portion 220 to the diffuser plate 100, the distance between the stop limit member 500 and the bottom of the avoidance groove 110 is equal to the maximum allowable offset a of the diffuser plate in the direction from the side plate portion 220 to the diffuser plate 100, and in the direction from the side plate portion 220 to the diffuser plate 100, the first height H of the elastic limiting portion satisfies the following relationship: H=a+h.

[0078] In addition, in some exemplary embodiments, the second height h and the first width C satisfy the following relationship: 1 / 2≤h / C≤2 / 3. In this way, the stopper 500 can effectively limit the maximum allowable offset a of the diffuser 100, meet the space dimension requirements during assembly, and ensure that no obvious contour features appear on the side surface of the diffuser 100.

[0079] In some exemplary embodiments, the stop limit member 500 can be constructed as a limit platform 510, which is disposed on a side surface of the first clamping portion 311 close to the diffuser plate 100, and the spring sheet 321 is also disposed on a side surface of the first clamping portion 311 close to the diffuser plate 100, and the spring sheet 321 is configured to slide in a direction away from the limit platform 510 at one end close to the diffuser plate 100 when the force applied by the diffuser plate 100 is applied.

[0080] It is understandable that the above is only an example, and in actual application, the specific structure and location of the stopper 500 are not limited thereto. For example, the stopper 500 may also be disposed on a side of the abutting platform 322 that is away from the diffuser 100, and may also prevent the elastic sheet 321 from deforming too much and causing the diffuser 100 to deflect too much.

[0081] In addition, it should be noted that in the above embodiment, the maximum allowable offset a of the diffuser 100 is limited by setting the stop limiter 500, but it is not limited to this. For example, in practical applications, the maximum allowable offset a can also be limited by limiting the sliding stroke of the end of the spring close to the diffuser 100 by the avoidance groove 110. In addition, in some exemplary embodiments, the display panel may include four sides, and at least one of the four sides of the display panel is a binding side for setting a binding circuit board. As shown in the figure, the diffuser 100 may include four sides, and at least one side corresponds to the binding side. In some embodiments, the limiter 300 may be set on the other sides of the diffuser 100 except the binding side. For example, one side of the display panel is a binding side, and accordingly, the limiter 300 may be set on the other three sides of the diffuser 100 except the binding side. It can be understood that in practical applications, the setting position of the limiter 300 is not limited to this.

[0082] In addition, in a second aspect, the embodiment of the present disclosure provides a display device, including the backlight module provided by the embodiment of the present disclosure. Obviously, the display device provided by the embodiment of the present disclosure also has the beneficial effects brought by the backlight module provided by the embodiment of the present disclosure, which will not be repeated here.

[0083] There are a few points to note:

[0084] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

[0085] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the thickness of layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0086] (3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0087] The above are only specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present disclosure shall be based on the protection scope of the claims.

Claims

1. A backlight module, characterized in that: Used to provide backlight for a display panel, wherein the display panel comprises a display side and a backlight side disposed opposite to each other; The backlight module comprises: A diffusion plate, located on the backlight side of the display panel; a back plate, comprising a bottom plate portion and a side plate portion, wherein the bottom plate portion is located on a side of the diffusion plate away from the display panel, and the side plate portion surrounds the periphery of the diffusion plate; and A plurality of limiting members are arranged around the diffusion plate, and are used to limit the diffusion plate within the space enclosed by the bottom plate portion and the side plate portion; wherein, The limiting member comprises a connecting portion connected to the side plate portion, and an elastic limiting portion connected to the connecting portion, wherein in a direction from the side plate portion to the diffuser plate, the elastic limiting portion is located between the side plate portion and the diffuser plate; Furthermore, in a direction from the side plate portion to the diffusion plate, the elastic limiting portion can be elastically deformed under the force applied by the diffusion plate to limit the offset of the diffusion plate.

2. The backlight module according to claim 1, characterized in that: The limiting member is a metal limiting member made of metal material.

3. The backlight module according to claim 1, characterized in that: The side panel portion includes a first edge, which is an edge of the side panel portion in the direction from the backlight side to the display side and is located away from the bottom panel portion; the connecting portion includes a first clamping portion, a second clamping portion and a connecting portion, and the connecting portion is connected between the first clamping portion and the second clamping portion so that the first clamping portion, the second clamping portion and the connecting portion are combined to form a clamping groove; wherein the opening of the clamping groove faces the side where the bottom panel portion is located and is clamped on the first edge.

4. The backlight module according to claim 3, characterized in that: The side panel portion also includes an inner side surface and an outer side surface which are arranged opposite to each other along a direction pointing from the side panel portion to the diffuser plate, the inner side surface is located on a side of the outer side surface close to the diffuser plate, the first clamping portion is located on a side of the inner side surface close to the diffuser plate, and the second clamping portion is located on a side of the outer side surface away from the diffuser plate; a first clamping portion is provided on one of the outer side surface and the second clamping portion, and a second clamping portion is provided on the other, and the first clamping portion is clamped and connected with the second clamping portion.

5. The backlight module according to claim 4, characterized in that: The first engaging portion includes an engaging protrusion or an engaging elastic sheet, and the second engaging portion includes an engaging groove or an engaging hole, and the engaging protrusion or the engaging elastic sheet is engaged in the engaging groove or the engaging hole.

6. The backlight module according to claim 1, characterized in that: The peripheral side surface of the diffuser plate is provided with an avoidance groove at a position corresponding to the limiting member; in the direction from the side plate portion to the diffuser plate, one end of the elastic limiting portion close to the diffuser plate at least partially extends into the corresponding avoidance groove.

7. The backlight module according to claim 6, characterized in that: In a direction from the side plate portion to the diffuser plate, a groove body depth b of the avoidance groove is greater than a maximum allowable offset a of the diffuser plate in a direction from the side plate portion to the diffuser plate.

8. The backlight module according to claim 7, characterized in that: The elastic limiting part includes an elastic sheet, which is connected to the connecting part and extends and tilts toward the side where the diffusion plate is located, so that the elastic sheet can be squeezed and elastically deformed by the force applied by the diffusion plate.

9. The backlight module according to claim 8, characterized in that: The spring sheet is configured to extend obliquely relative to the side panel portion, and the inclination angle θ relative to the side panel portion is greater than or equal to 30° and less than or equal to 50°. The length L of the spring sheet along its own extension direction is equal to H / sinθ, where H is the height of the spring sheet in the direction from the side panel portion to the diffuser.

10. The backlight module according to claim 8, characterized in that: The elastic limiting part also includes a supporting platform for contacting and abutting against the diffusion plate. The supporting platform is connected to a side of the elastic sheet close to the diffusion plate and is arranged parallel to the side plate part.

11. The backlight module according to claim 1, characterized in that: The limiting member also includes a stop limiting member for stopping and limiting the diffuser plate, wherein in the direction from the side panel portion to the diffuser plate, the stop limiting member is connected to the connecting portion and is located between the side panel portion and the diffuser plate; and in the direction from the side panel portion to the diffuser plate, the elastic limiting portion has a first height H, and the stop limiting member has a second height h, and the first height H is greater than the second height h.

12. The backlight module according to claim 11, characterized in that: The backlight module also includes an inner frame glue, which is arranged in a space enclosed by the bottom plate portion and the side plate portion, and in a direction from the side plate portion to the diffusion plate, the inner frame glue has a first width C, and the second height h is less than or equal to the first width C.

13. The backlight module according to claim 12, characterized in that: The peripheral side surface of the diffuser plate is provided with an avoidance groove at a position corresponding to the limit member; in the direction from the side plate portion to the diffuser plate, the distance between the stop limit member and the bottom of the avoidance groove is equal to the maximum allowable offset a of the diffuser plate in the direction from the side plate portion to the diffuser plate, and in the direction from the side plate portion to the diffuser plate, the first height H of the elastic limit portion satisfies the following relationship: H=a+h.

14. The backlight module according to claim 13, characterized in that: The second height h and the first width C satisfy the following relationship: 1 / 2≤h / C≤2 / 3.

15. A display device, characterized in that: Comprising the backlight module as described in any one of claims 1 to 14.

Images