Backlight module and display device thereof

Abstract

The invention provides a backlight module and a display device, the backlight module comprises a back plate and a reflection cup, the back plate comprises a bottom plate and a side plate, the bottom plate and the side plate form a containing cavity, the reflection cup is arranged in the containing cavity, and the backlight module is characterized in that a reflection cup fixing structure is arranged on the side, close to the bottom plate, of the reflection cup and penetrates through the bottom plate; an anti-loosening structure used for preventing the reflection cup fixing structure from loosening is arranged on the side, away from the reflection cup, of the bottom plate. By optimizing the fixing mode of the reflecting cup, the problem that the reflecting cup tilts after reliability testing is solved, reworkability and fixing reliability of the reflecting cup are improved, and cost is saved.

Description

Technical Field

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

[0002] With the rapid development and iteration of new energy vehicles and intelligent connected vehicle technologies in recent years, consumers' demands for in-vehicle display devices are constantly increasing in terms of size and performance indicators, such as high color gamut, high dynamic contrast, narrow borders, large screens, curved surfaces, etc. For high contrast requirements, one of the technical routes to achieve this is to use the local dynamic dimming technology (Local Dimming) solution of the backlight module; to achieve high-quality dynamic dimming technology display effects, it is necessary to use the direct-type backlight module local dynamic dimming technology. The direct-type backlight module includes a light source and a reflector cup. The light source is arranged in the reflector cup and the light emitted by the light source is transmitted to the display panel by the reflector cup, which can improve the illumination distance, illumination area and light energy utilization rate under limited light energy. In the prior art, the injection molded reflective cup is generally fixed in the display area only with double-sided tape, and the adhesion of the double-sided tape decreases with temperature changes. In addition, the reflective cup is usually made of resin and will warp and deform due to temperature changes. During the reliability test (RA), when the peeling force generated by the warping of the reflective cup exceeds the adhesion of the double sides, the double-sided tape of the reflective cup will fail at the warped part, and poor display such as grid patterns and light shadows will appear at the warped part, affecting the display effect. Summary of the invention

[0003] In view of this, the present invention provides a backlight module and a display device thereof to solve the problem of poor display caused by grid patterns and lamp shadows due to the rear warping of the reflective cup RA.

[0004] The present invention provides a backlight module, including a back plate and a reflector cup, the back plate including a bottom plate and side plates, the bottom plate and the side plates forming a receiving cavity, the reflector cup being arranged in the receiving cavity, a reflector cup fixing structure being arranged on the side of the reflector cup close to the bottom plate, the reflector cup fixing structure passing through the bottom plate, and an anti-loosening structure for preventing the reflector cup fixing structure from loosening being arranged on the side of the bottom plate away from the reflector cup.

[0005] Based on the same inventive concept, the present invention further provides a display module, including the backlight module of the present invention.

[0006] Compared with the prior art, the display module and display device provided by the present invention achieve at least the following beneficial effects:

[0007] The backlight module provided by the present invention comprises a back plate and a reflector cup, wherein the back plate comprises a bottom plate and a side plate, the bottom plate and the side plate form a receiving cavity, the reflector cup is arranged in the receiving cavity, a reflector cup fixing structure is arranged on the side of the reflector cup close to the bottom plate, the reflector cup fixing structure passes through the bottom plate, and an anti-loosening structure for preventing the reflector cup fixing structure from loosening is arranged on the side of the bottom plate away from the reflector cup. By arranging the reflector cup fixing structure on the side of the reflector cup facing the back plate and fixing it to the back plate, the problem that the adhesive force of the adhesive tape decreases as the temperature rises due to only using an adhesive tape to fix the reflector cup is solved, and at the same time, the reflector cup is tilted toward the light emitting side due to the change in ambient temperature, resulting in the occurrence of poor display phenomena such as grid patterns and lamp shadows on the display device is solved, the fixing method of the reflector cup is optimized, the reworkability and fixing reliability of the reflector cup are improved, and the cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0009] Figure 1 It is a structural schematic diagram of the backlight module of the present invention;

[0010] Figure 2 for Figure 1 A local enlarged schematic diagram of point C;

[0011] Figure 3 It is a structural schematic diagram of the buckle structure of the present invention;

[0012] Figure 4 for Figure 2 A cross-sectional view at 1-1';

[0013] Figure 5 for Figure 2 A cross-sectional view at 2-2';

[0014] Figure 6 for Figure 1 Another partial enlarged schematic diagram of C;

[0015] Figure 7 for Figure 6 A cross-sectional view of the latch hole 15 at 3-3';

[0016] Figure 8 for Figure 6 A cross-sectional view of the latch 22 at 3-3';

[0017] Fig.9A and Fig. 9B for Figure 6A cross-sectional view of the latch 22 along the direction from the reflector cup 4 to the bottom plate 8b;

[0018] Fig.10 for Figure 1 Another partial enlarged schematic diagram of C;

[0019] Fig.11 It is a schematic structural diagram of the display device of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0022] Figure 1 Schematic diagram of the structure of a backlight module provided by the present invention. Figure 1 As shown, the backlight module 01 includes a reflector cup fixing structure 1, an anti-loosening structure 2, a reflector cup supporting column 3, a reflector cup 4, a thermal conductive tape 5, an LED substrate 6, an LED 7, a back plate 8, a diffusion plate 9, a middle frame 10, a diffusion film 11, a prism film 12, and a reflective polarized light enhancement film 13. The back plate 8 includes a side plate 8a and a bottom plate 8b. The reflector cup fixing structure 1 is located on the side of the reflector cup 4 facing the bottom plate 8b and passes through the bottom plate 8b. An anti-loosening structure 2 for preventing the reflector cup fixing structure 1 from loosening is provided on the side of the bottom plate 8b away from the reflector cup 4. By optimizing the fixing structure of the reflector cup 4, the reflector cup fixing structure 1 and the anti-loosening structure 2 are tightly engaged and fixed to each other, so that the reflector cup 4 will not warp or have fixing failure even in a high temperature and high humidity environment, avoiding the display problems such as grid patterns and lamp shadows on the display device, and at the same time, the reworkability and fixing reliability of the reflector cup 4 can be improved.

[0023] Furthermore, the reflective cup 4 and the reflective cup fixing structure 1 can be integrally formed, thereby improving production efficiency and processing accuracy, reducing production complexity, and saving costs.

[0024] Furthermore, if Figure 2 and Figure 3 As shown, Figure 2 for Figure 1A partial enlarged view of C, Figure 3 for Figure 2 The top view of the buckle structure 21, the anti-loosening structure 2 can be the buckle structure 21, a groove 1d is set on the reflector cup fixing structure 1, and the buckle structure 21 is clamped on the periphery of the groove 1d. When the buckle structure 21 is clamped on the periphery of the groove 1d, the buckle structure 21 and the reflector cup fixing structure 1 are mutually clamped, so that the reflector cup 4 ( Figure 1 The backlight module 01 ( Figure 1 The brightness uniformity of the image is measured.

[0025] Next, please refer to Figure 2 The reflector cup fixing structure 1 includes a first sub-section 1a, a second sub-section 1b, and a third sub-section 1c along the direction from the reflector cup 4 to the bottom plate 8b, the groove 1d is arranged in the second sub-section 1b, the diameter of the second sub-section 1a is smaller than the diameter of the third sub-section 1c, and the diameter of the second sub-section 1b is smaller than the diameter of the third sub-section 1c. Based on this structure, the third sub-section supports the buckle structure 21, which can prevent the buckle structure 21 from falling off, and improve the stability and fixing ability of the reflector cup fixing structure 1.

[0026] For further information, please refer to Figure 5 , Figure 5 for Figure 2 The cross-sectional view at 2-2' is shown in FIG. 8 , where the bottom plate 8b is away from the reflective cup 4 ( Figure 1 A first protrusion 14 is provided on one side of the reflector cup fixing structure 1, and one end of the buckle structure 21 is fixedly engaged with the first protrusion 14. Since both ends of the buckle structure 21 are fixed, the buckle structure 21 will not move due to the influence of external force, thereby improving the ability of the buckle structure 21 to resist displacement due to external factors, effectively exerting the fixing ability of the buckle structure 21, and further improving the stability and fixing ability of the reflector cup fixing structure 1.

[0027] Next, please refer to Figure 2, in the direction perpendicular to the bottom plate 8b, the height of the groove 1d is H1, the height from the bottom surface of the bottom plate 8b to the bottom surface of the groove 1d is H2, and the height of the buckle structure 21 is H3, H1≥H3≥H2. The groove 1d has a margin to facilitate the buckle structure 21 to buckle, so the height H1 of the groove 1d is the largest. At the same time, in order to facilitate the buckle structure 21 to buckle with the bottom surface of the bottom plate 8b and the bottom surface of the groove 1d in the direction perpendicular to the bottom plate 8b, it is necessary to ensure that the height H3 of the buckle structure 21 is greater than or equal to the height H2 from the bottom surface of the bottom plate 8b to the bottom surface of the groove 1d. In other words, the height of the part of the groove 1d that exceeds the bottom plate 8b cannot be greater than the height of the buckle structure 21. Based on this size setting, it can be ensured that the buckle structure 21 and the reflector cup fixing structure 1 are tightly buckled and fixed, and the buckle structure 21 and the reflector cup fixing structure 1 will not loosen under long-term use and external stress.

[0028] Please note that, please refer to Figure 2 and Figure 4 , Figure 4 for Figure 2 In the cross-sectional view at 1-1' of the reflector cup fixing structure 1, in the direction parallel to the bottom plate 8b, the cross-sectional shape at 1-1' of the reflector cup fixing structure 1 can be one of a circle, an ellipse, a polygon, and a rounded polygon. The cross-sectional shape of the reflector cup fixing structure 1 at 1-1' is not limited here, as long as the reflector cup 4 ( Figure 1 The structures having the functions as described above are all within the protection scope of the present invention.

[0029] Figure 6 The present invention provides Figure 1 Another local enlarged schematic diagram of point C.

[0030] like Figure 6 As shown, the anti-loosening structure 2 ( Figure 1 The reflector cup fixing structure 1 includes a latch 22, a latch hole 15 is provided, the latch 22 passes through the latch hole 15, and the latch 22 and the latch hole 15 cooperate with each other to fix the reflector cup. At the same time, the fixed reflector cup 4 ( Figure 1 The assembly method of (in) is simple to operate and solves the problem that the reflector cup 4 is difficult to rework.

[0031] Furthermore, the reflector cup fixing structure 1 includes a fourth section 1e, a latch hole 15 and a fifth section 1f along the direction of the reflector cup 4 pointing to the bottom plate 8b, and the diameter of the fourth section 1e is smaller than the diameter of the fifth section 1f. Based on this structure, the fifth section 1f can more firmly support the latch 22, improve the stability of the reflector cup fixing structure 1, and at the same time enhance the mechanical properties of the reflector cup fixing structure 1, avoiding the problem of poor mechanical properties of the reflector cup fixing structure 1 due to digging holes. Figure 6 Structural references not mentioned in the description Figure 1 and Figure 2 Description of the structure.

[0032] Further, Figure 7 for Figure 6 A cross-sectional view of the latch hole 15 at 3-3', Figure 8 for Figure 6 The cross-sectional view of the latch 22 at 3-3', for details, please continue to refer to Figure 7 and Figure 8 The cross-sectional shape of the latch hole 15 at 3-3' includes one of a quadrilateral, a rounded quadrilateral, a hexagon, and an arch shape. The cross-sectional shape of the latch 22 at 3-3' needs to be the same as the cross-sectional shape of the latch hole 15 at 3-3', so that the latch 22 can be matched with the latch hole 15 for installation. Under the interaction between the latch 22 and the latch hole 15, the fixation of the reflector cup 4 is achieved. Figure 1 The function of the reflective cup 4 is to solve the problem of warping after the reliability test.

[0033] During assembly, end 2 a ′ of the latch pin 22 enters the latch pin hole 15 first, and end 2 a of the latch pin 22 does not enter the latch pin hole 15 .

[0034] Further, please refer to Figure 6 , in the direction perpendicular to the bottom plate 8b, the height of the lower surface and / or upper surface of the 2a' end of the latch 22 is smaller than the height of the lower surface and / or upper surface of the 2a end of the latch 22, thereby ensuring that the latch 22 can be more easily inserted into the latch hole 15, reducing the difficulty of assembly, saving assembly time and cost. For details, please continue to refer to Fig.9A and Fig. 9B , Fig.9A and Fig. 9B The latch 22 ( Figure 6 ) In the cross-sectional view along the direction of the reflector cup 4 pointing to the base plate 8b, the structure of the pin 22 is within the protection scope of the present invention as long as the height of the lower surface and / or upper surface of the pin 22 that first enters the pin hole 15 is less than the height of the lower surface and / or upper surface of the pin 22 that enters the pin hole 15 later.

[0035] Optional, please continue to refer to Figure 6 , Fig.9A and Fig. 9B A second protrusion 16 is provided on the side of the latch 22 away from the bottom plate 8b. The second protrusion 16 is located at the 2a end of the latch 22, that is, the second protrusion 16 does not enter the latch hole 15, thereby preventing the latch 22 from sliding out of the reflector cup fixing structure 1 and falling off under the action of external forces.

[0036] Optional, please continue to refer to Figure 6A third protrusion 17 is provided on the side of the bottom plate 8b away from the reflector cup 4, and the height H7 of the third protrusion 17 is greater than 0 mm. The third protrusion 17 is located at one end of the latch pin 22 that enters the latch pin hole 15, and one end of the latch pin 22 that enters the latch pin hole 15 abuts against the third protrusion 17, thereby further preventing the latch pin 22 from being loosened from the reflector cup fixing structure 1 under the action of external force and losing the function of fixing the reflector cup 4.

[0037] For details, please continue to refer to Figure 6 In the direction perpendicular to the bottom plate 8b, the height of the pin hole 15 is H4, the height from the bottom surface of the bottom plate 8b to the bottom surface of the pin hole 15 is H5, and the thickness of the pin 22 is H6, H4≥H6≥H5. The height H4 of the pin hole 15 is greater than the thickness H6 of the pin 22 in order to facilitate the insertion of the pin 22 into the pin hole 15. When the pin 22 is inserted into the pin hole 15, the reflector cup 4 will drop. When the thickness H6 of the pin 22 is greater than or equal to the height H5 from the bottom surface of the bottom plate 8b to the bottom surface of the pin hole 15, the pin 22 can be fixed in the direction perpendicular to the bottom plate 8b, ensuring that the pin 22 can be firmly fixed in the pin hole 15 and will not fall off due to external forces.

[0038] Fig.10 The present invention provides Figure 1 Another local enlarged schematic diagram of point C.

[0039] like Fig.10 As shown, the anti-loosening structure 2 includes a thread locking structure 23. The reflector cup fixing structure away from the reflector cup 4 includes a thread 111, and the thread locking structure 23 locks the thread 111 on both sides of the thread 111 to fix the thread 111, thereby fixing the reflector cup 4.

[0040] For further information, please refer to Fig.10 , in the direction perpendicular to the bottom plate 8b, the upper end of the thread 111 is located above the lower surface of the back plate 8b, that is, the distance H8 between the upper end of the thread 111 and the lower surface of the back plate 8b>0mm, so that when the thread 111 and the thread locking structure 23 are locked, the reflector cup 4 can be fully clamped in the longitudinal direction to prevent loosening, and also prevent the reflector cup 4 from shaking in the display module and generating abnormal noise. Based on this design, the locking force of the thread locking structure 23 on the thread 111 can be increased to prevent the thread locking structure 23 from loosening and falling off during locking, and also prevent the thread 111 from breaking when the locking force is too large.

[0041] Fig.11 A schematic structural diagram of a display device provided by the present invention.

[0042] The present invention provides a display device, such as Fig.11As shown, the backlight module 01 provided in the above embodiment also includes a display panel 18. Similarly, since a reflector cup fixing structure 1 is arranged on the side of the reflector cup 4 close to the bottom plate 8b, the reflector cup fixing structure 1 passes through the bottom plate 8b, and an anti-loosening structure 2 for preventing the reflector cup fixing structure 1 from loosening is arranged on the side of the bottom plate 8b away from the reflector cup 4, the problem of the reflector cup 4 tilting and the double-sided adhesive bonding failure is solved, and the reworkability and fixing reliability of the reflector cup 4 are improved. Fig.11 Reference to structures not described in Figure 1 The structure description in .

[0043] It can be seen from the above embodiments that the backlight module and the display device provided by the present invention achieve at least the following beneficial effects:

[0044] The backlight module provided by the present invention comprises a back plate and a reflector cup, wherein the back plate comprises a bottom plate and a side plate, the bottom plate and the side plate form a receiving cavity, the reflector cup is arranged in the receiving cavity, a reflector cup fixing structure is arranged on the side of the reflector cup close to the bottom plate, the reflector cup fixing structure passes through the bottom plate, and an anti-loosening structure for preventing the reflector cup fixing structure from loosening is arranged on the side of the bottom plate away from the reflector cup. By arranging the reflector cup fixing structure on the side of the reflector cup facing the back plate and fixing it to the back plate, the problem that the adhesive force of the adhesive tape decreases as the temperature rises due to only using an adhesive tape to fix the reflector cup is solved, and at the same time, the reflector cup is tilted toward the light emitting side due to the change in ambient temperature, resulting in the occurrence of poor display phenomena such as grid patterns and lamp shadows on the display device is solved, the fixing method of the reflector cup is optimized, the reworkability and fixing reliability of the reflector cup are improved, and the cost is saved.

[0045] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A backlight module, comprising a back plate and a reflective cup, wherein the back plate comprises a bottom plate and a side plate, the bottom plate and the side plate form a receiving cavity, the reflective cup is arranged in the receiving cavity, characterized in that: A reflector cup fixing structure is arranged on the side of the reflector cup close to the bottom plate, the reflector cup fixing structure passes through the bottom plate, and an anti-loosening structure for preventing the reflector cup fixing structure from loosening is arranged on the side of the bottom plate away from the reflector cup.

2. The backlight module according to claim 1, characterized in that: The reflective cup and the reflective cup fixing structure are integrally formed.

3. The backlight module according to claim 1, characterized in that: The anti-loosening structure is a buckle structure, the reflector cup fixing structure is provided with a groove, and the buckle structure is clamped on the periphery of the groove.

4. The backlight module according to claim 3, characterized in that: The reflector cup fixing structure includes a first section, a second section, and a third section along a direction from the reflector cup to the bottom plate. The groove is arranged in the second section. The diameter of the first section is smaller than the diameter of the third section.

5. The backlight module according to claim 3, characterized in that: A first protrusion is disposed on the bottom plate away from the reflector cup, and the buckle structure is engaged and fixed with the first protrusion.

6. The backlight module according to claim 3, characterized in that: In a direction perpendicular to the bottom plate, the height of the groove is H1, the height from the lower surface of the back plate to the lower surface of the groove is H2, the height of the buckle structure is H3, and H1≥H3≥H2.

7. The backlight module according to claim 1, characterized in that: In a direction parallel to the bottom plate, the cross-sectional shape of the reflector cup fixing structure is one of a circle, an ellipse, a polygon, and a rounded polygon.

8. The backlight module according to claim 1, characterized in that: The anti-loosening structure is a latch pin, the reflector cup fixing structure is provided with a latch pin hole, and the latch pin passes through the latch pin hole.

9. The backlight module according to claim 8, characterized in that: The reflector cup fixing structure includes a fourth section, the latch hole and a fifth section along a direction from the reflector cup to the bottom plate, and a diameter of the fourth section is smaller than a diameter of the fifth section.

10. The backlight module according to claim 8, characterized in that: The cross-section of the pin hole is in the shape of a quadrilateral, a rounded quadrilateral, a hexagon, or an arch.

11. The backlight module according to claim 8, characterized in that: In a direction perpendicular to the bottom plate, the height of the lower surface and / or upper surface of the latch that enters the latch hole first is smaller than the height of the lower surface and / or upper surface of the latch that enters the latch hole later.

12. The backlight module according to claim 8, characterized in that: The latch pin is provided with a second protrusion on a side away from the bottom plate, and the second protrusion is located at an end of the latch pin that enters the latch pin hole.

13. The backlight module according to claim 8, characterized in that: The bottom plate is provided with a third protrusion on a side away from the reflector cup, and the third protrusion is located at an end of the latch that enters the latch hole behind the latch.

14. The backlight module according to claim 8, characterized in that: In a direction perpendicular to the bottom plate, the height of the pin hole is H4, the height from the lower surface of the bottom plate to the lower surface of the pin hole is H5, the thickness of the pin is H6, and H4≥H6≥H5.

15. The backlight module according to claim 1, characterized in that: The anti-loosening structure is a thread locking structure, the reflector cup fixing structure at a side away from the reflector cup includes a thread, and the thread locking structure locks the thread.

16. The backlight module according to claim 15, characterized in that: In a direction perpendicular to the bottom plate, the upper end of the thread is located above the lower surface of the back plate.

17. A display device, characterized in that: It comprises the backlight module as described in any one of claims 1-15.

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