Backlight module and display device with improved fixing of reflective elements

Abstract

The utility model relates to a backlight module and display device of improving the fixedness of reflection unit, and this backlight module contains backplate, circuit board, reflection unit, multiple light emitting elements and fixing piece. Backplate contains first clamping part and first perforation. Circuit board sets up in one side of backplate, and contains third perforation. Reflection unit sets up in the other side of circuit board relative to backplate, and contains second clamping part and second perforation. Multiple light emitting elements set up on the side of circuit board towards reflection unit. Fixing piece includes first stop portion, connecting portion and second stop portion in order along long axis direction, wherein fixing piece respectively passes in first perforation of backplate, third perforation of circuit board and second perforation of reflection unit, and first stop portion and first clamping part of backplate mutually clamped, second stop portion and second clamping part of reflection unit mutually clamped.

Description

[0001] This application claims priority to Chinese Patent Application No. 202510213895.5, filed on February 25, 2025, entitled “Backlight Module and Display Device for Improving the Fixability of Reflective Units”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This case relates to backlight modules and display devices, and more particularly to a backlight module and display device that improves the fixation of a reflective unit. Background Technology

[0003] Backlight modules in existing display devices can be divided into direct-lit backlight modules and edge-lit backlight modules. Generally, direct-lit backlight modules have reflective units on the circuit board corresponding to the light-emitting elements to improve the brightness of the light source. In order to maintain optical performance, it is necessary to ensure the fixation between the reflective units, the circuit board, and the back plate located below the circuit board during assembly.

[0004] Screws combined with adhesive are a common method of fixing components. However, as the density of light-emitting elements on the circuit board in the backlight module increases, the space available for screw fixing of the reflective unit decreases, and sometimes adhesive fixing alone is used. This not only weakens the fixation, but also makes it easy for the adhesive to produce air bubbles or loosen, leading to loosening or damage of components during transportation or use, affecting the reliability and lifespan of the product, and also affecting the light-emitting performance of the light-emitting module. Therefore, there is room for improvement. Utility Model Content

[0005] The purpose of this invention is to provide a backlight module and display device that can solve the above-mentioned problems.

[0006] Another objective of this invention is to provide a backlight module and a display device using the backlight module, wherein the backlight module achieves both simplified assembly procedures and maintenance of stability by employing a fixed structure that reduces the space required for assembly.

[0007] To achieve the above objectives, this invention provides a backlight module for improving the fixation of a reflective unit, comprising a backplate, a circuit board, a reflective unit, multiple light-emitting elements, and a fixing member. The backplate includes a first engaging portion and a first through-hole. The circuit board is disposed on one side of the backplate and includes a third through-hole. The reflective unit is disposed on the other side of the circuit board opposite the backplate and includes a second engaging portion and a second through-hole. Multiple light-emitting elements are disposed on the side of the circuit board facing the reflective unit. The fixing member sequentially includes a first stop portion, a connecting portion, and a second stop portion along its long axis, wherein the fixing member passes through the first through-hole of the backplate, the third through-hole of the circuit board, and the second through-hole of the reflective unit, respectively, and the first stop portion engages with the first engaging portion of the backplate, and the second stop portion engages with the second engaging portion of the reflective unit.

[0008] In one embodiment, the fastener further includes a first limiting portion disposed on the first stop portion to engage with the first engaging portion.

[0009] In one embodiment, the fastener further includes a second limiting portion disposed on the second stop portion to engage with the second engaging portion.

[0010] In one embodiment, the first stop of the fastener does not protrude from the back plate on the other side of the circuit board.

[0011] In one embodiment, the second stop of the fixing member does not protrude from the other side of the reflective unit relative to the circuit board.

[0012] In one embodiment, it further includes an optical element disposed on the other side of the reflective unit opposite to the circuit board; and a support disposed on the second stop to support the optical element.

[0013] In one embodiment, the visible light transmittance of the support is greater than that of the fastener.

[0014] In one embodiment, the support and the fixing member are a single integrally formed component.

[0015] In one embodiment, the reflective unit has multiple spacers and multiple openings, the multiple openings being divided by multiple spacers, and multiple light-emitting elements being exposed in the multiple openings respectively, and the fasteners being engaged with the intersections of the multiple spacers arranged in pairs.

[0016] To achieve the above objectives, this invention provides a display device comprising a backlight module as described above, and a display panel disposed on the backlight module. Attached Figure Description

[0017] To make the above and other objects, features, advantages and embodiments of this utility model more readily understood, the accompanying drawings are now described as follows.

[0018] Figure 1 This diagram shows an exploded view of the backlight module according to an embodiment of this case.

[0019] Figure 2A This diagram shows a fixing component in a backlight module according to an embodiment of the present invention.

[0020] Figure 2B This diagram shows a cross-sectional view of the fixing member in the backlight module according to an embodiment of the present case.

[0021] Figure 3A This diagram shows a cross-sectional view of the first, second, and third perforations in the backlight module according to an embodiment of the present invention.

[0022] Figure 3BThis diagram shows a partial cross-sectional view of the backlight module according to an embodiment of the present invention.

[0023] Figure 3C show Figure 3B A magnified schematic diagram of range A in the middle.

[0024] Figure 4 A schematic diagram of a fastener according to another embodiment of the present invention is shown.

[0025] Figure 5 A schematic diagram of a fastener according to another embodiment of the present invention is shown.

[0026] Figure 6 This diagram shows a cross-sectional view of a backlight module according to another embodiment of the present invention.

[0027] Figure 7A A schematic diagram of the fastener and support portion according to an embodiment of this case.

[0028] Figure 7B A schematic diagram of the fastener and support portion according to another embodiment of this case.

[0029] Figure 7C A schematic diagram of the fastener and support portion according to another embodiment of this case.

[0030] Figure 7D This diagram shows an exploded view of a backlight module according to another embodiment of the present invention. Detailed Implementation

[0031] Some typical embodiments embodying the features and advantages of this invention will be described in detail in the following description. It should be understood that this invention can have various variations in different forms, but none of them depart from the scope of this invention, and the description and drawings herein are for illustrative purposes only and not for limiting this invention.

[0032] Please see Figure 1 , Figures 2A to 2B and Figures 3A to 3BThe backlight module 1 used in this case to improve the fixation of the reflective unit is a direct-lit backlight module, which has a display panel (not shown) to form a display device. The backlight module 1 includes a back plate 10, a circuit board 20, a light-emitting element 30, a reflective unit 40, and a fixing member 50. The circuit board 20 is disposed on the back plate 10, and the reflective unit 40 is disposed on the other side of the circuit board 20 opposite to the back plate 10. That is, the back plate 10, the circuit board 20, and the reflective unit 40 are stacked sequentially from bottom to top along the Z-axis. The light-emitting element 30 is disposed on the side of the circuit board 20 facing the reflective unit 40. The fixing member 50 has a long axis direction C and includes a first stop portion 51, a second stop portion 52, and a connecting portion 53 disposed between the first stop portion 51 and the second stop portion 52. The back plate 10 is provided with a first through hole 11 and a first engaging part 12, the reflective unit 40 is provided with a second through hole 43 and a second engaging part 44, and the circuit board 20 is provided with a third through hole 21. The fixing member 50 is simultaneously inserted into the first through hole 11, the second through hole 43 and the third through hole 21, and engages with the first engaging part 12 of the back plate 10 and the second engaging part 44 of the reflective unit 40 by means of the first stop part 51 and the second stop part 52 respectively.

[0033] In other words, the fixing member 50 is used to fix the relative positions of the back plate 10, the circuit board 20, and the reflective unit 40. When the back plate 10, the circuit board 20, and the reflective unit 40 are stacked, the first through hole 11, the second through hole 43, and the third through hole 21 are aligned with each other. The fixing member 50 restricts the displacement of the back plate 10, the circuit board 20, and the reflective unit 40 along the XY plane by simultaneously passing through the first through hole 11, the second through hole 43, and the third through hole 21, that is, restricts the displacement in the direction C perpendicular to the long axis of the fixing member 50. On the other hand, by the first stop 51 and the second stop 52 engaging with the first engaging part 12 and the second engaging part 44 respectively, the fixing member 50 can further restrict the displacement of the back plate 10, the circuit board 20, and the reflective unit 40 along the Z-axis, that is, restrict the displacement in the direction C parallel to the long axis of the fixing member 50. The horizontal widths W1 of the first stop portion 51 and W3 of the second stop portion 52 are made greater than the horizontal width W2 of the connecting portion 53 to prevent the back plate 10 and the reflective unit 40 from moving away from the circuit board 20. In other words, the fastener 50, through its structural design that increases the width at both ends along the long axis C, provides a force in the opposite direction to the circuit board 20, causing the reflective unit 40 to face the circuit board 20 and the back plate 10 to face the circuit board 20, thereby ensuring that the back plate 10, the circuit board 20, and the reflective unit 40 are stacked close together. Therefore, as long as the horizontal widths of the first stop portion 51 and the second stop portion 52 are both greater than the horizontal width of the connecting portion 53, the horizontal widths of the first stop portion 51 and the second stop portion 52 can be the same or different. More specifically, the cross-sectional areas of the first stop portion 51 and the second stop portion 52 perpendicular to the long axis direction C are larger than the cross-sectional area of ​​the connecting portion 53 perpendicular to the long axis direction C, so as to form structural steps between the first stop portion 51 and the connecting portion 53 and between the second stop portion 52 and the connecting portion 53, respectively. Thus, the back plate 10, the circuit board 20 and the reflective unit 40 can be confined between the first stop portion 51 and the second stop portion 52.

[0034] Accordingly, the first engaging portion 12 is disposed on the sidewall surrounding the first through hole 11 and located on the other side of the back plate 10 opposite to the circuit board 20, and the second engaging portion 44 is disposed on the sidewall surrounding the second through hole 43 and located on the other side of the reflective unit 40 opposite to the circuit board 20; that is, the first engaging portion 12 and the second engaging portion 44 are located on opposite sides of the backlight module 1. The structure of the first engaging portion 12 changes according to the first stop portion 51, and the structure of the second engaging portion 44 changes according to the second stop portion 52. For example, grooves are formed to correspond to the step shape between the first stop portion 51 and the second stop portion 52 and the connecting portion 53, respectively. Thus, the displacement of the fixing member 50 along its long axis direction C can be restricted, and the upper and lower joint parts have a backing effect to prevent shaking.

[0035] Accordingly, through the mutual cooperation of insertion and engagement, the fastener 50 can simultaneously restrict the displacement of the back plate 10, circuit board 20 and reflective unit 40 in the three-dimensional directions of X, Y and Z, thereby maintaining a stable close-fitting and non-slip state.

[0036] Furthermore, the reflective unit 40 has a plurality of spacers 41 and a plurality of openings 42, with the openings 42 being separated by the plurality of spacers 41. The light-emitting elements 30 on the circuit board 20 are positioned corresponding to the openings 42. In one embodiment, the openings 42 are implemented in a rectangular shape; in other embodiments, the openings 42 can be implemented in other shapes depending on the requirements. Therefore, the shape of the openings 42 of the reflective unit 40 can be varied according to requirements, provided that uniform illumination can be achieved.

[0037] As is known in the prior art, backlight modules are often secured to their components using screws. Screw securing relies on the threaded engagement between the screw and the secured component. Therefore, when using screw securing, the space occupied within the component includes not only the screw itself but also the threads surrounding it. Traditionally, the screw itself protrudes, and there are minimum size limitations, preventing it from being shrunk to fit perfectly flat against the backplate 10. However, in recent years, to improve local dimming, the number of dimming zones has increased, the opening 42 has decreased, and the increased density of the light-emitting elements 30 has reduced the width of the spacing 41 of the reflective units 40. This reduces the space available for screws, leading to problems such as insufficient securing strength, compromised stability, or easy deformation of the reflective units. Under this premise, this invention provides a fastener 50 that uses a through-and-fit locking method for fixation, which effectively saves the space required for threaded installation. That is, compared to screws that must be screwed in from the outside of the back plate 10, the fastener 50 can be inserted and fixed from the front of the reflector unit 40. The length of the fastener 50 can be designed to be shorter, not only not exceeding the shape of the back plate 10, but also having a smaller cross-sectional area perpendicular to the long axis C, which is more conducive to its application on reflector units with reduced spacing. Moreover, the direct through-and-fit fixing method of the fastener 50 also helps to improve the situation where the reflector unit 40 is prone to deformation when fixed with screws. In addition, compared to the time-consuming screw rotation fixing, the through-and-fit fastener 50 only needs to perform an insertion action during the assembly process to automatically complete the positioning and locking, effectively simplifying the assembly steps and shortening the assembly time.

[0038] In actual implementation, since the horizontal width W3 of the second stop 52 is greater than the horizontal width W1 of the first stop 51, the fastener 50 is inserted from the smaller end rather than the larger end. That is, it can be inserted through the second through hole 43 at the end with the first stop 51. Finally, the fastener 50 is fastened at the larger end, which is the junction of the second stop 52 and the second through hole 43. This junction is located on the inner side of the reflector unit 40, and will not be fastened at the smaller end, that is, not on the outer side of the back plate 10. Moreover, since the fastener 50 has stop portions with increased horizontal width at both ends, it is necessary to further consider how to make the insertion process smoother. First, the horizontal width W7 of the third through hole 21 on the circuit board 20 is approximately equal to or greater than the larger of the horizontal width W1 of the first stop 51 and the horizontal width W3 of the second stop 52. This minimizes the impact of the fastener 50 on the circuit board 20 when it passes through the third through hole 21, and avoids damage to the circuit board 20 due to the insertion of the fastener 50. Secondly, the first through hole 11 provided on the back plate 10 has three horizontal widths W4, W5 and W6 from bottom to top, and W5 is smaller than W4 and W6; wherein W4 corresponds to the change of the horizontal width W1 of the first stop portion 51 and W5 is approximately equal to or greater than the horizontal width W2 of the connecting portion 53, so as to form the first engaging portion 12 by reducing the horizontal width from W4 to W5; the horizontal width W6 is approximately equal to or greater than the larger of the horizontal width W1 of the first stop portion 51 and the horizontal width W3 of the second stop portion 52, so as to reduce the damage to the back plate 10 caused by the action of the fastener 50, and W6 and the horizontal width W7 of the third through hole 21 may be equal or unequal. Furthermore, the second through hole 43 provided in the reflective unit 40 has two horizontal widths, W8 and W9, from bottom to top, with W8 being smaller than W9. The horizontal width W9 corresponds to the change in horizontal width W3 of the second stop portion 52, and the horizontal width W8 is approximately equal to or greater than the horizontal width W2 of the connecting portion 53. This reduction in horizontal width from W9 to W8 forms the second engaging portion 44. The horizontal width W8 may be equal to or unequal to the horizontal width W5 in the first through hole 11. In one embodiment, the horizontal widths W5 and W8 are unequal, for example, W8 is smaller than W5. This improves the stability of the fixing member 50 in the through hole by allowing the smaller horizontal width to contact the connecting portion 53, thereby reducing the displacement of the fixing member 50 along its long axis direction C (i.e., the XY plane direction).

[0039] In one embodiment, the horizontal width W1 of the first stop 51 is further implemented to be smaller than the horizontal width W4 in the first through hole 11, that is, as Figure 3CAs shown, the interference amount T between the first stop portion 51 and the first engaging portion 12 is less than the difference between W2 and W1, and also less than the difference between W4 and W5. This structural design ensures that the horizontal width W1 of the first stop portion 51 is only slightly larger than the horizontal width W5 in the first through hole 11 and the horizontal width W8 in the second through hole 43. This facilitates the insertion of the fastener 50 through the second through hole 43 at the end where the first stop portion 51 is located. In one embodiment, the interference amount T is no greater than 0.2 mm. Furthermore, in conventional art, if screws are used to fasten the reflective unit 40, a minimum wall thickness requirement must be met for the reflective unit 40. If the wall thickness is less than the minimum requirement, fastening the screws may cause the reflective unit 40 to break. However, in this invention, the main interference engagement position of the fastener 50 is not in the reflective unit 40, but in the first engaging portion 12 of the back plate 10. Therefore, the force on the reflective unit 40 is smaller, preventing breakage of the reflective unit 40.

[0040] The fastener 50 is positioned at the intersection of pairs of intersecting intervals 41, thereby providing a stronger fixing force. It should be noted that... Figure 1 The distance between the fastener 50 and the through holes (first through hole 11, second through hole 43 and third through hole 21) shown in the illustration is three openings 42 apart. This is for illustrative purposes only. The spacing between the fastener and the through holes can be varied according to actual implementation requirements and is not limited to this.

[0041] In actual implementation, the first stop portion 51 is designed not to protrude from the other surface of the back plate 10 relative to the circuit board 20, that is... Figure 3B The lower surface of the backplate 10 may, for example, be flush with or recessed from the lower surface of the backplate 10 to maintain the flatness of the mounting plane of the backlight module 1; furthermore, the second stop portion 52 is also configured not to protrude from the other surface of the reflective unit 40 relative to the circuit board 20, that is... Figure 3B The upper surface of the intermediate reflective unit 40 can be flush with or recessed, for example. This can be varied according to actual implementation requirements and is not limited. In addition, the first engaging portion 12 and the second engaging portion 44 are respectively provided with grooves, and the resulting bends or shoulders prevent the fastener 50 from sinking, while the lower engaging portion 44 prevents the fastener 50 from jumping out or sliding downwards.

[0042] Please see Figure 4The diagram shows a fastener according to another embodiment of the present invention. In this embodiment, the fastener 50a further includes a first limiting portion 54 disposed on the first stop portion 51 and a second limiting portion 55 disposed on the second stop portion 52. The first limiting portion 54 and the first stop portion 51 simultaneously engage with the first engaging portion 12, and the second limiting portion 55 and the second stop portion 52 simultaneously engage with the second engaging portion 44. That is, when the first limiting portion 54 and the second limiting portion 55 are provided, the structures of the first engaging portion 12 and the second engaging portion 44 are also changed accordingly. With such a structural design, the displacement of the fastener 50a perpendicular to its long axis can be further restricted, which helps to improve the stability of the fastener. In other embodiments, it can also be implemented by only providing the first limiting portion 54 or the second limiting portion 55, which can also achieve the effect of preventing the fastener from displacing perpendicular to its long axis. The first limiting portion 54 does not necessarily have to be a symmetrical protrusion design; an asymmetrical design can also be considered.

[0043] Please see Figure 5 The diagram shows a fastener according to another embodiment of the present invention. In this embodiment, the fastener 50b includes a first stop 51b, which is implemented as two protrusions disposed on the periphery of the connecting portion 53, and a second stop 52, which is implemented as a columnar structure with a diameter larger than that of the connecting portion 53 and coaxial with the connecting portion 53. In other words, in addition to providing the function of engaging with the first engaging portion 12 on the back plate 10, the first stop 51b also provides the function of limiting the displacement of the fastener 50b along the direction perpendicular to its long axis, that is, equivalent to the function of the aforementioned limiting portion. In this embodiment, compared with the second stop 52, the protrusion range of the first stop 51b on the periphery of the connecting portion 53 is smaller, making it easier to pass through the various through holes, which helps to further optimize the assembly process.

[0044] Please see Figure 6The diagram shows a cross-sectional view of a backlight module that improves the fixation of the reflective unit according to another embodiment of the present invention. The backlight module 1 further includes an optical element 60 disposed on the other side of the reflective unit 40 opposite to the circuit board 20. For example, the optical element 60 may be a diffuser plate, but is not limited thereto. Additionally, the backlight module 1 further includes a support portion 70 disposed between the fixing member 50 and the optical element 60 to support the optical element 60. Specifically, the support portion 70 is made of a light-transmitting material, such as a transparent material, to avoid blocking or interfering with the light from the light-emitting element 30 and the reflective unit 40; on the other hand, the fixing member 50 is made of an opaque material, such as a white material, to avoid light leakage affecting optical performance. In other words, the visible light transmittance of the support portion 70 is greater than that of the fixing member 50. In this embodiment, the support part 70 is designed mainly to provide support for the optical element 60 for models with larger screens. If the model has a smaller screen, the support part 70 is not required.

[0045] In one embodiment, the support portion 70 is positioned corresponding to the fixing member 50, that is, it is disposed on the second stop portion 52. In this case, the support portion 70 and the second stop portion 52 can be further configured to be combined with each other, for example, by adhesive bonding. In another embodiment, the support portion 70 and the fixing member 50 are implemented as a single integrally formed component, for example, an integrally formed component of dissimilar materials can be formed using an injection molding process. By disposing the support portion 70 on the fixing member 50, the downward pressure generated by the optical element 60 disposed above the support portion 70 can be used to pressurize the second stop portion 52, further stabilizing the close stacking state between the reflector unit 40, the circuit board 20, and the back plate 10. Furthermore, the horizontal width of the bottom of the support portion 70 can be made greater than the horizontal width of the second stop portion 52. In this case, the bottom of the support portion 70 abuts against the reflector unit 40, providing a force to further restrict the separation of the reflector unit 40 and the circuit board 20.

[0046] As described above, the fixing member 50 and the supporting part 70 comprehensively provide functions such as fixing, limiting, and supporting in the backlight module. Therefore, in specific implementations, the structure can be varied according to actual needs. For example, in one embodiment, such as Figure 7A As shown, the fastener 50c includes a first stop 51c, a connecting part 53c, and a second stop 52c, and a support part 70c is disposed on the second stop 52c; wherein the first stop 51c provides both locking and limiting functions, the second stop 52c provides locking function, and the support part 70c is implemented as a frustum, with the horizontal width of the bottom of the frustum being greater than the horizontal width of the second stop 52c. In another embodiment, as... Figure 7BAs shown, the fastener 50d includes a first stop 51d, a connecting part 53d, and a second stop 52d, with a support part 70d disposed on the second stop 52d; wherein the first stop 51d provides both locking and limiting functions, the second stop 52d provides a locking function, and the support part 70d and the second stop 52d are implemented as columnar structures with the same horizontal width. In another embodiment, as... Figure 7C As shown, the fastener 50e includes a first stop 51e, a connecting portion 53e, and a second stop 52e. The first stop 51e provides both engaging and limiting functions, the second stop 52e provides engaging functionality, and a support 70e is disposed on the second stop 52e. The support 70e includes a base 71e and an extension 72e, both of which are sheet-like. The extension 72e is substantially perpendicular to the base 71e and extends in a direction away from the second stop 52e. In another embodiment, as... Figure 7D As shown, the fastener 50f includes a first stop 51f, a connecting part 53f, and a second stop 52f, with a support part 70f disposed on the second stop 52f. The first stop 51f provides both locking and limiting functions, the second stop 52f is designed to fit the intersection of the spacer 41 to provide locking, and the shape of the second through hole 43 corresponds to the second stop 52f. The support part 70f is implemented as a columnar structure. Therefore, while providing fixing, limiting, and supporting functions, the structures of the fastener 50f and the support part 70f can be arbitrarily varied, not limited to those shown in the drawings, and all are within the scope of this invention.

[0047] In summary, the backlight module and display device of this invention, which improves the fixation of the reflective unit, maintains the close-fitting stacked state of the backplate, circuit board, and reflective unit in the backlight module by using a through-fitting and snap-fit ​​fixing method. Compared with the conventional screw-locking method, the space occupied by the fixing member of this invention is significantly reduced, making it more suitable for use in narrower gaps due to the increase in the number of light-emitting elements. Furthermore, the fixing member can be combined with the support to further support the optical elements, and the downward pressure generated by the optical elements also helps to further stabilize the close-fitting stacked state.

[0048] It should be noted that the above are merely preferred embodiments for illustrating this case, and this case is not limited to the described embodiments. The scope of this case is determined by the scope of protection of the appended claims. Moreover, this case can be modified in various ways by those skilled in the art, all of which shall not depart from the scope of protection sought by the appended claims.

[0049] [List of Labels in the Attached Image] 1: Backlight Module 10: Back panel 11: First perforation 12: First Card Combination Section 20: Circuit board 21: Third perforation 30: Light-emitting element 40: Reflection unit 41: Spacing section 42: Opening 43: Second perforation 44: Second Card Combination 50, 50a, 50b, 50c, 50d, 50e, 50f: Fasteners 51, 51b, 51c, 51d, 51e, 51f: First stop section 52, 52c, 52d, 52e, 52f: Second stop section 53, 53c, 53d, 53e, 53f: Connecting parts 54: First limiting part 55: Second limiting part 60: Optical components 70, 70c, 70d, 70e, 70f: Support section A: Scope C: Major axis direction X, Y, Z: Axial T: Interference quantity W1, W2, W3, W4, W5, W6, W7, W8, W9: Horizontal width.

Claims

1. A backlight module for improving the fixation of a reflective unit, characterized in that, Include: Backplate, which includes a first engaging portion and a first perforation; A circuit board disposed on one side of the back plate and including a third through hole; A reflective unit is disposed on the other side of the circuit board opposite to the back plate, and includes a second engaging portion and a second through hole; Multiple light-emitting elements are disposed on the side of the circuit board facing the reflective unit; and The fastener includes a first stop, a connecting part, and a second stop in sequence along its long axis. The fastener is respectively inserted into the first through hole of the back plate, the third through hole of the circuit board, and the second through hole of the reflective unit. The first stop engages with the first engaging part of the back plate, and the second stop engages with the second engaging part of the reflective unit.

2. The backlight module for improving the fixation of the reflective unit according to claim 1, characterized in that, The fastener further includes a first limiting part, which is disposed on the first stop part to engage with the first engaging part.

3. The backlight module for improving the fixation of the reflective unit according to claim 2, characterized in that, The fastener further includes a second limiting part, which is disposed on the second stop part to engage with the second engaging part.

4. The backlight module for improving the fixation of the reflective unit according to claim 1, characterized in that, The first stop portion of the fastener does not protrude from the back plate on the other side relative to the circuit board.

5. The backlight module for improving the fixation of the reflective unit according to claim 1, characterized in that, The second stop portion of the fixing member does not protrude from the other side of the reflective unit relative to the circuit board.

6. The backlight module for improving the fixation of the reflective unit according to claim 1, characterized in that, It further includes an optical element disposed on the other side of the reflective unit opposite to the circuit board; and a support portion disposed on the second stop portion to support the optical element.

7. The backlight module for improving the fixation of the reflective unit according to claim 6, characterized in that, The visible light transmittance of the support is greater than that of the fastener.

8. The backlight module for improving the fixation of the reflective unit according to claim 6, characterized in that, The support and the fastener are a single component integrally formed.

9. The backlight module for improving the fixation of the reflective unit according to claim 1, characterized in that, The reflective unit has multiple spacers and multiple openings, the multiple openings being formed by the multiple spacers, and the multiple light-emitting elements being exposed in the multiple openings respectively, and the fixing member being engaged with the intersection of the multiple spacers arranged in pairs.

10. A display device, characterized in that, A backlight module comprising a reflective unit fixation enhancement according to any one of claims 1-9, and a display panel disposed on the backlight module.

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