Backlight module, display device and preparation method thereof

Abstract

The application discloses a backlight module, a display device and a preparation method thereof. The backlight module comprises a lamp plate assembly, a back plate, a heat-conducting base and a frame. The heat-conducting base is arranged on the side of the lamp plate assembly away from the back plate and is used for transferring heat of the lamp plate assembly. The frame is arranged on the side of the heat-conducting base away from the lamp plate assembly. The frame has a hollow cavity. The hollow cavity is filled with a first material and a second material. The second material is a light scattering material. The first material can expand or shrink in volume along with the heat transferred by the heat-conducting base and push the second material to move away from the heat-conducting base through the expansion of the first material or make the second material move towards the heat-conducting base through the shrinkage of the first material. When the temperature of the partition lamp plate assembly rises during work, the heat is transferred to the first material through the heat-conducting base. The first material expands and pushes the second material to move away from the heat-conducting base, so that the light crosstalk and reflection are prevented.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a backlight module, a display device, and a method for manufacturing the same. Background Technology

[0002] Mini LED (Mini Light Emitting Diode) backlit LCD modules, which have emerged in recent years, possess inherent advantages in display due to their high brightness and high contrast, and are gradually gaining popularity and becoming increasingly widely used. However, existing Mini LED displays still suffer from the problem of inter-display crosstalk (halo). Summary of the Invention

[0003] In view of this, this application provides a backlight module, a display device and a method for manufacturing the same, to solve the problem of light crosstalk (halo) in the display sections of the prior art.

[0004] To address the aforementioned technical problems, the first technical solution provided in this application is as follows: A backlight module is provided, comprising a lamp panel assembly and a back plate. The lamp panel assembly is fixed to the back plate, and further comprises a heat-conducting base and a frame. The heat-conducting base is disposed on the side of the lamp panel assembly away from the back plate, for transferring heat from the lamp panel assembly. The frame is disposed on the side of the heat-conducting base away from the lamp panel assembly, and the frame has a hollow cavity. The hollow cavity is filled with a first material and a second material. The first material is disposed close to the heat-conducting base, and the second material is disposed on the side of the first material away from the heat-conducting base. The second material is a light-scattering material. The first material is configured to expand or contract in volume with the heat transferred by the heat-conducting base, and the expansion of the first material pushes the second material away from the heat-conducting base; or, the contraction of the first material causes the second material to move closer to the heat-conducting base.

[0005] In one embodiment, the heat-conducting base covers the hollow cavity to form a first cavity and a second cavity that are interconnected; wherein, the first cavity is filled with the first material and the second material, and the first material expands due to the heat transferred from the lamp panel assembly by the heat-conducting base, pushing a portion of the second material into the second cavity; or the heat-conducting base does not transfer the heat of the lamp panel assembly to the first material, and the first material contracts, causing the second material to fall back from the second cavity into the first cavity.

[0006] In one embodiment, the lamp panel assembly has multiple light-emitting zones, and the heat-conducting base transfers heat from the light-emitting zones to the first material; the frame, the first material, the second material, and the heat-conducting base form a light reflection system, the light reflection system including multiple heat dissipation zones; wherein, the heat dissipation zones correspond to one or more of the light-emitting zones.

[0007] In one embodiment, each heat dissipation zone is provided with a plurality of heat dissipation elements, which are disposed on the side of the heat-conducting base near the lamp panel assembly for transferring heat from the light-emitting zone; wherein, the first material is in contact with the plurality of heat dissipation elements to expand or contract due to the heat transferred from the light-emitting zone by the heat dissipation elements.

[0008] In one embodiment, the end face of the frame away from the heat-conducting base has an exhaust hole and a waterproof and breathable membrane, the exhaust hole communicating with the second cavity; the waterproof and breathable membrane covers the exhaust hole.

[0009] In one embodiment, the frame includes: a body portion and a protrusion portion, the body portion having a welding surface at an end near the heat-conducting base, the body portion being fixedly connected to the heat-conducting base via the welding surface; the body portion having a first groove; the protrusion portion extending from the surface of the body portion away from the heat-conducting base to a side away from the body portion; the protrusion portion having a second groove, the second groove communicating with the first groove; wherein, the first groove and the heat-conducting base form a first cavity, and the second groove forms a second cavity.

[0010] In one embodiment, the waterproof and breathable membrane is a one-way breathable but waterproof material; the first material is a material that expands and contracts with temperature changes; the second material is a mixture of liquid and light-reflecting particles; the frame is a transparent and hollow plastic frame; and the heat-conducting base is a copper disc base.

[0011] To solve the above-mentioned technical problems, the second technical solution provided in this application is: to provide a display device, including a display panel and a backlight module, wherein the backlight module is electrically connected to the display panel and is used to provide a light source for the display panel; the backlight module is any of the backlight modules described above; wherein the light reflection system is disposed between the display panel and the back panel.

[0012] In one embodiment, the display device further includes an optical film disposed between the back plate and the display panel; wherein the light reflection system is disposed between the optical film and the back plate.

[0013] To address the aforementioned technical problems, the third technical solution provided in this application is: a method for manufacturing a display device, wherein the display device is any of the display devices described above, the method comprising: providing a heat-conducting base and a frame; wherein the frame has a hollow cavity; sequentially filling the hollow cavity with a second material and a first material; fixing the heat-conducting base and the frame together to form a closed cavity, and covering the end face of the frame away from the heat-conducting base with a waterproof and breathable film; fixing the surface of the heat-conducting base away from the frame to a lamp panel assembly; fixing the lamp panel assembly to a back plate; and sequentially assembling the back plate, the optical film, and the display panel.

[0014] The beneficial effects of this application are as follows: Unlike existing technologies, the backlight module of this application includes a lamp panel assembly and a back plate. The lamp panel assembly is fixed on the back plate and also includes a heat-conducting base and a frame. The heat-conducting base is located on the side of the lamp panel assembly away from the back plate to transfer heat from the lamp panel assembly. The frame is located on the side of the heat-conducting base away from the lamp panel assembly and has a hollow cavity filled with a first material and a second material. The first material is located close to the heat-conducting base, and the second material is located on the side of the first material away from the heat-conducting base. The second material is a light-scattering material. The first material is configured to expand or contract in volume with the heat transferred by the heat-conducting base, and the expansion of the first material pushes the second material away from the heat-conducting base; or, the contraction of the first material causes the second material to move closer to the heat-conducting base. When the zoned lamp panel assembly is working, the area heats up, and heat is transferred through the heat-conducting base to the thermally expanding and contracting first material. The expansion of the first material pushes the second material away from the heat-conducting base, thus preventing light crosstalk and reflection. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the disassembled structure of the backlight module provided in this application;

[0017] Figure 2 This is a schematic diagram of the overall structure of the backlight module provided in this application;

[0018] Figure 3 This is a structural schematic diagram of the frame and heat-conducting base provided in this application;

[0019] Figure 4a This is a schematic diagram of the normal state of the light reflection system provided in this application;

[0020] Figure 4b This is a schematic diagram of the heated state of the light reflection system provided in this application;

[0021] Figure 5 This is a schematic diagram of the framework provided in this application;

[0022] Figure 6 This is a schematic diagram of the light-emitting partition structure of the lamp panel assembly provided in this application;

[0023] Figure 7 This is a schematic diagram of the overall structure of the light reflection system provided in this application;

[0024] Figure 8 yes Figure 2 A magnified schematic diagram of a portion of the structure of part A;

[0025] Figure 9 This is a schematic diagram of the disassembled structure of the display device provided in this application;

[0026] Figure 10 This is a flowchart of the method for manufacturing the display device provided in this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 200. Display device; 201. Display panel; 202. Optical film; 203. Frame; 204. Protective layer; 100. Backlight module; 10. Lamp panel assembly; 101. Lamp panel; 102. Light-emitting unit; 11. Light-emitting zone; 20. Back plate; 30. Light reflection system; 31. Frame; 310. Hollow cavity; 311. Second cavity; 312. First cavity; 313. Body part; 3131. First groove; 314. Protrusion; 3141. Second groove; 315. Welding surface; 32. Thermally conductive base; 321. Heat dissipation element; 3211. Heat transfer foot; 322. Heat dissipation zone; 33. Second material; 331. Liquid; 332. Light-reflecting particles; 34. First material; 35. Vent; 40. Thermally conductive adhesive layer; 50. Waterproof and breathable membrane. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0030] The terms "first" and "second" in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications will also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] Mini LED backlit LCD module displays, which have emerged in recent years, have two main characteristics: ① dense and numerous LED arrays, resulting in high brightness; ② local dimming, providing high contrast and a more layered image. These features give Mini LED backlit LCD module displays inherent display advantages, and they are gradually gaining popularity and becoming increasingly widely used. However, while Mini LED displays offer these advantages, they also have some minor drawbacks. One major drawback is the crosstalk problem between display sections, commonly known in the industry as "halo effect."

[0033] To address the aforementioned issues, this application proposes a backlight module, display device, and manufacturing method for improving the halo effect of a Mini LED liquid crystal module display.

[0034] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of the disassembled structure of the backlight module provided in this application; Figure 2 This is a schematic diagram of the overall structure of the backlight module provided in this application; Figure 3 This is a structural schematic diagram of the frame and heat-conducting base provided in this application.

[0035] The backlight module 100 provided in this application includes a lamp panel assembly 10 and a back plate 20. The lamp panel assembly 10 is fixed on the back plate 20. It also includes a heat-conducting base 32 and a frame 31. The heat-conducting base 32 is disposed on the side of the lamp panel assembly 10 away from the back plate 20 and is used to transfer the heat of the lamp panel assembly 10. The frame 31 is disposed on the side of the heat-conducting base 32 away from the lamp panel assembly 10. The frame 31 has a hollow cavity, which is filled with a first material 34 and a second material 33. The first material 34 is disposed close to the heat-conducting base 32, and the second material 33 is disposed on the side of the first material 34 away from the heat-conducting base 32. The second material 33 is a light-scattering material. The first material 34 is configured to expand or contract in volume with the heat transferred by the heat-conducting base 32, and the expansion of the first material 34 pushes the second material 33 to move away from the heat-conducting base 32; or, the contraction of the first material 34 causes the second material 33 to move closer to the heat-conducting base 32.

[0036] Specifically, the heat-conducting base 32 is disposed on the lamp panel assembly 10. Since the light-emitting unit 102 generates heat when its temperature rises during operation, the heat-conducting base 32 transfers this heat to the first material 34. The heat-conducting base 32 can be made of metal, such as a copper disc base. The frame 31 is a transparent and hollow frame 31, requiring optical transparency. The hollow cavity of the frame 31 can accommodate the first material 34 and the second material 33. The frame 31 can be made of materials such as plastic or silicone, which have the advantage of being easier to mold than metal. In this embodiment, the first material 34 is a thermally expanding and contracting material, such as thermosensitive plastic or thermosensitive ceramic. The second material 33 is a light-scattering material. After being pushed away from the heat-conducting base 32 by the first material 34, the second material 33 is used to reflect the light emitted around the light-emitting section 11 on the lamp panel assembly 10. The second material 33 can be a mixture of liquid 331 and light-reflecting particles 332. For example, the light-reflecting particles 332 can be metal particles; the liquid 331 is an opaque liquid, such as a white paste. The lamp panel assembly 10 of this application is fixed on the back plate 20. The heat-conducting base 32 is disposed on the side of the lamp panel assembly 10 away from the back plate 20. A thermally conductive adhesive layer 40 can be disposed thereon to connect the lamp panel 101. The shape of the thermally conductive adhesive layer 40 can match the shape of the heat-conducting base 32.

[0037] In one embodiment, the heat-conducting base 32 covers the hollow cavity 310 to form a first cavity 312 and a second cavity 311 that are interconnected; wherein, the first cavity 312 is filled with a first material 34 and a second material 33, the first material 34 expands due to the heat transferred by the heat-conducting base 32 to the lamp panel assembly 10, pushing part of the second material 33 into the second cavity 311; or the heat-conducting base 32 does not transfer the heat generated by the lamp panel assembly 10 to the first material 34, the first material 34 contracts, so that the second material 33 falls back from the second cavity 311 to the first cavity 312.

[0038] Please see Figures 4a to 6 , Figure 4a This is a schematic diagram of the normal state of the light reflection system provided in this application; Figure 4b This is a schematic diagram of the heated state of the light reflection system provided in this application; Figure 5 This is a schematic diagram of the framework provided in this application; Figure 6 This is a schematic diagram of the light-emitting partition structure of the lamp panel assembly provided in this application.

[0039] In one embodiment, such as Figure 5 As shown, the frame 31 includes a body portion 313 and a protrusion 314. The body portion 313 has a welding surface 315 at its end near the heat-conducting base 32, and the welding surface 315 of the body portion 313 is fixedly connected to the heat-conducting base 32 by ultrasonic welding. The body portion 313 has a first groove 3131; the protrusion 314 extends from the surface of the body portion 313 away from the heat-conducting base 32 to the side away from the body portion 313; the protrusion 314 has a second groove 3141, which communicates with the first groove 3131. It can be understood that the second groove 3141 is a groove extending from the bottom wall (not shown) of the first groove 3131 in a direction away from the heat-conducting base 32. The first groove 3131 and the heat-conducting base 32 form a first cavity 312, and the second groove 3141 forms a second cavity 311. That is, the heat-conducting base 32 covers the first groove 3131 to form a first cavity 312 for accommodating the first material 34 and the second material 33, and the bottom wall of the first groove 3131 and the second groove 3141 form a second cavity 311. In the initial state, both the first material 34 and the second material 33 are located in the first cavity 312; when the first material 34 is heated and expands, the volume of the first material 34 increases, and it occupies more space in the first cavity 312, thus pushing a portion of the second material 33 into the second cavity 311.

[0040] The lamp panel assembly 10 has multiple light-emitting zones 11, and the heat-conducting base 32 transfers the heat of the light-emitting zones 11 to the first material 34.

[0041] Specifically, such as Figure 6As shown, the lamp panel assembly 10 includes a lamp panel 101 and a plurality of light-emitting units 102 disposed on the lamp panel 101. The light-emitting units 102 can be LEDs, Mini LEDs, or Micro LEDs, etc. Since Mini LEDs can operate in zones, the plurality of light-emitting units 102 on the lamp panel 101 form a plurality of light-emitting zones 11. When the light-emitting units 102 in a zone are working, the local temperature of the light-emitting zone 11 will rise, thereby allowing the heat-conducting base 32 disposed on one side of the light-emitting zone 11 to transfer the heat of the light-emitting zone 11 to the first material 34 on the other side of the light-emitting zone 11.

[0042] like Figure 4a , Figure 4b and Figure 6 As shown, when a certain light-emitting partition 11 is working while the adjacent light-emitting partition 11 is not working, the light from the working light-emitting partition 11 will radiate outwards, thus forming a halo around the working light-emitting partition 11. The embodiment provided in this application draws the light radiating outwards from the light-emitting partition 11 inwards and towards the non-light-emitting surface. That is, when the light-emitting partition 11 is working, the temperature of its lamp panel assembly 10 will rise. This application transfers the heat generated by the temperature rise of the lamp panel assembly 10 to the first material 34 through the heat-conducting base 32. After the first material 34 expands due to heat, it pushes the second material 33 to move away from the heat-conducting base 32. This involves pushing the second material 33 from the first cavity 312 into the second cavity 311. The second material 33 is opaque and contains light-reflecting particles 332. These particles reflect light from the lamp panel assembly 10, and the opaque liquid 331 within the second material 33 creates a mirror effect. This reflects the light that was originally radiating outwards from the light-emitting unit 102, directing it to the non-light-emitting surface (not shown in the figure), thus resolving the halo problem caused by the partitioned display. It can be understood that when the light-emitting partition 11 stops working or the display device 200 is turned off, the temperature of the lamp panel assembly 10 decreases. When the first material 34 no longer receives heat from the heat-conducting base 32, it contracts, causing the second material 33 in the second cavity 311 to fall back into the first cavity 312.

[0043] As described above, the frame 31 provided on the lamp panel assembly 10 in this embodiment, together with the first material 34, the second material 33 and the heat-conducting base 32, actually forms a light reflection system 30. Through this light reflection system 30, the light originally emitted to the surrounding area of ​​the light-emitting unit 102 is pushed and emitted away from the light-emitting side when the display is partitioned, so that the human eye will not perceive the halo phenomenon when viewing the display device 200.

[0044] It is worth noting that when the lamp panel assembly 10 is not working or the display device 200 is in a powered-off state, both the first material 34 and the second material 33 are located in the first cavity 312 and will not enter the second cavity 311. If the second material 33 is still present in the second cavity 311 when the lamp panel assembly 10 is not working, a dark display cell may be visible at the moment the display device 200 is powered off. Therefore, the above-described arrangement of this application can prevent the dark cell from being generated at the moment of power-off.

[0045] In one embodiment, such as Figure 4a and Figure 4b As shown, the end face of the frame 31 away from the heat-conducting base 32 has an exhaust hole 35 and a waterproof and breathable membrane 50. The exhaust hole 35 communicates with the second cavity 311; the waterproof and breathable membrane 50 covers the exhaust hole 35. Specifically, the exhaust hole 35 can be set at the connection or boundary (not shown) of the frame 31 of two adjacent heat dissipation partitions 322, so that each exhaust hole 35 can be used for exhaust of multiple adjacent heat dissipation partitions 322, resulting in high working efficiency. In other embodiments, the exhaust hole 35 can also be set at any position on the end face of the frame 31 away from the heat-conducting base 32, and the number of exhaust holes 35 can be set as needed, which is not limited in this application. By covering the exhaust hole 35 with the waterproof and breathable membrane 50, the liquid 331 in the second cavity 311 will not flow out, while the gas in the first cavity 312 and the second cavity 311 can permeate, resulting in a good waterproof and breathable effect. In this embodiment, the waterproof and breathable membrane 50 is a one-way breathable but waterproof material, such as DuPont paper.

[0046] Please see Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of the overall structure of the light reflection system provided in this application; Figure 8 yes Figure 2 A magnified schematic diagram of a portion of the structure of part A.

[0047] In one embodiment, such as Figure 2 and Figure 7 As shown, the light reflection system 30 includes multiple heat dissipation zones 322, each corresponding to one or more light-emitting zones 11. The heat dissipation zones 322 are formed by a frame 31 and a heat-conducting base 32. Each heat dissipation zone 322 can correspond one-to-one with a light-emitting zone 11, or one heat dissipation zone 322 can correspond to multiple light-emitting zones 11. The density of the heat dissipation zones 322 and the density of the light-emitting zones 11 can be the same or different, and a corresponding relationship can be established between them as needed; this application does not impose any restrictions on this.

[0048] In one embodiment, each heat dissipation partition 322 is provided with a plurality of heat dissipation elements 321, which are disposed on the side of the heat-conducting base 32 near the lamp panel assembly 10 for transferring heat from the light-emitting partition 11; wherein, the first material 34 is disposed in contact with the plurality of heat dissipation elements 321 so as to expand or contract the heat of the light-emitting partition 11 transferred through the heat dissipation elements 321.

[0049] Specifically, multiple heat dissipation elements 321 can be arranged around or symmetrically around each heat dissipation partition 322. The heat dissipation elements 321 and the heat-conducting base 32 can be integrally set, or the heat dissipation elements 321 can be fixed to the edge of the heat-conducting base 32 of each heat dissipation partition 322 by ultrasonic welding. The heat dissipation elements 321 are set close to the lamp panel assembly 10, which can facilitate the transfer of heat from the light-emitting partition 11 to the first material 34. The first material 34 is directly filled on the side of the heat dissipation element 321 away from the light-emitting partition 11, so that the first material 34 and the heat dissipation element 321 are in direct contact, thereby improving the heat transfer efficiency and making the expansion time of the first material 34 after being heated shorter. This allows the second material 33 to be squeezed and pushed into the second cavity 311 more quickly, improving the effect of preventing light crosstalk.

[0050] In this embodiment, as Figure 8 As shown, multiple heat transfer feet 3211 can be provided at the connection end of the heat dissipation element 321 away from the heat conduction base 32. The heat transfer feet 3211 are used to transfer the heat of the light-emitting partition 11. Providing multiple heat transfer feet 3211 can improve the efficiency of heat dissipation element 321 in conducting heat to the first material 34, that is, improve the heat conduction efficiency.

[0051] To address the aforementioned technical problems, this application also provides a display device 200.

[0052] Please see Figure 9 , Figure 9 This is a schematic diagram of the disassembled structure of the display device provided in this application.

[0053] The display device 200 includes a display panel 201 and a backlight module 100. The backlight module 100 is electrically connected to the display panel 201 and is used to provide a light source for the display panel 201. The backlight module 100 is any of the backlight modules mentioned above. The light reflection system 30 is disposed between the display panel 201 and the back plate 20.

[0054] Specifically, since the light reflection system 30 provided by the backlight module 100 is used for light diffusion when the lamp panel assembly 10 is working, the light reflection system 30 needs to be set between the back plate 20 where the lamp panel assembly 10 is located and the display panel 201.

[0055] In one embodiment, the display device 200 further includes an optical film 202 disposed between the back plate 20 and the display panel 201; wherein, the light reflection system 30 is disposed between the optical film 202 and the back plate 20.

[0056] Specifically, the optical film 202 can be a polarizer or a light-transmitting film, etc. A frame 203 can be provided around the periphery of the optical film 202 to fix the optical film 202 and the frame 203 into an integral structure. The optical film 202 is disposed between the back plate 20 and the display panel 201. In this application, the light reflection system 30 is disposed between the optical film 202 and the back plate 20, so that it will not affect the light emission effect of the lamp panel assembly 10, nor will it affect the light transmission effect of the optical film 202.

[0057] To address the aforementioned technical problems, this application also provides a method for manufacturing a display device 200.

[0058] Please see Figure 10 , Figure 10 This is a flowchart of the method for manufacturing the display device provided in this application.

[0059] The display device 200 is any of the above-mentioned display devices 200, and will not be described in detail here.

[0060] In one embodiment, the method for manufacturing the display device 200 includes:

[0061] S1: Provides a heat-conducting base 32 and a frame 31; wherein the frame 31 has a hollow cavity 310.

[0062] Specifically, the heat-conducting base 32 is used to transfer heat from the lamp panel assembly 10. The frame 31 is disposed on the side of the heat-conducting base 32 away from the lamp panel assembly 10. The frame 31 has a hollow cavity 310 for accommodating the first material 34 and the second material 33. The heat-conducting base 32 can be integrally formed or welded with multiple heat dissipation elements 321. The heat dissipation elements 321 are used to sense the temperature of the lamp panel assembly 10 and transfer the heat from the light-emitting section 11 of the lamp panel assembly 10 to the first material 34. Setting multiple heat dissipation elements 321 can improve the heat transfer efficiency of the heat-conducting base 32. The specific structure of the heat-conducting base 32 and the frame 31 is described above and will not be repeated here.

[0063] S2: The second material 33 and the first material 34 are sequentially filled into the hollow cavity 310.

[0064] Specifically, the first material 34 is a material that expands and contracts with temperature, and the second material 33 is a mixture of liquid 331 and light-reflecting particles 332. The first material 34 and the second material 33 are sequentially filled into the hollow cavity 310 of the frame 31. The properties, functions, and arrangement of the first material 34 and the second material 33 are as described above and will not be repeated here.

[0065] S3: The heat-conducting base 32 and the frame 31 are fixedly connected to form a closed cavity, and a waterproof and breathable membrane 50 is covered on the end face of the frame 31 away from the heat-conducting base 32.

[0066] Specifically, after sequentially filling the hollow cavity 310 of the frame 31 with the first material 34 and the second material 33, the heat-conducting base 32 and the frame 31 can be fixed. For example, the welding surface 315 of the frame 31 can be welded to the heat-conducting base 32 by ultrasonic welding to form a closed cavity (not shown in the figure) within the frame 31. Vent holes 35 can be opened on the end face of the frame 31 away from the heat-conducting base 32 for ventilation, and a waterproof and breathable membrane 50 can be covered over the vent holes 35 to prevent leakage of the liquid 331 of the second material 33 within the hollow cavity 310 and to allow ventilation within the closed cavity of the frame 31. The waterproof and breathable membrane 50 can be made of materials such as DuPont paper.

[0067] S4: Fix the surface of the heat-conducting base 32 away from the frame 31 onto the lamp panel assembly 10.

[0068] Specifically, after fixing the heat-conducting base 32 and the frame 31, the surface of the heat-conducting base 32 away from the frame 31 can be fixed to the lamp panel assembly 10 using thermally conductive adhesive.

[0069] S5: Fix the light panel assembly 10 onto the back plate 20.

[0070] Specifically, after the heat-conducting base 32 is fixed to the lamp panel assembly 10, the lamp panel assembly 10 can be fixed to the back plate 20, so that the overall structure of the light reflection system 30 is further fixed to the back plate 20.

[0071] S6: Assemble the backplate 20, optical film 202 and display panel 201 in sequence.

[0072] Specifically, the backplate 20, which holds the light reflection system 30 and the lamp panel assembly 10, is assembled with the optical film 202, the frame 203, and the display panel 201 to form a complete display device 200. It is understood that after the optical film 202 and the frame 203 are fixed, a protective layer 204 can be provided between the frame 203 and the display panel 201 to prevent frictional damage between the display panel 201 and the optical film 202.

[0073] The backlight module disclosed in this application includes a lamp panel assembly and a backplate. The lamp panel assembly is fixed to the backplate and also includes a heat-conducting base and a frame. The heat-conducting base is located on the side of the lamp panel assembly away from the backplate and is used to transfer heat from the lamp panel assembly. The frame is located on the side of the heat-conducting base away from the lamp panel assembly and has a hollow cavity filled with a first material and a second material. The first material is located close to the heat-conducting base, and the second material is located on the side of the first material away from the heat-conducting base. The second material is a light-scattering material. The first material is configured to expand or contract in volume with the heat transferred by the heat-conducting base, and the expansion of the first material pushes the second material away from the heat-conducting base; or, the contraction of the first material causes the second material to move closer to the heat-conducting base. When the zoned lamp panel assembly is working, the area heats up, and heat is transferred through the heat-conducting base to the thermally expanding and contracting first material. The expansion of the first material pushes the second material away from the heat-conducting base, thereby preventing light crosstalk and reflection.

[0074] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A backlight module, comprising a lamp panel assembly and a back plate, wherein the lamp panel assembly is fixed to the back plate, characterized in that, Also includes: A heat-conducting base is disposed on the side of the lamp panel assembly away from the back plate, for transferring heat from the lamp panel assembly; A frame is disposed on the side of the heat-conducting base away from the lamp panel assembly. The frame has a hollow cavity filled with a first material and a second material. The first material is disposed close to the heat-conducting base, and the second material is disposed on the side of the first material away from the heat-conducting base. The second material is a light-scattering material. The first material is configured to expand or contract in volume with the heat transferred by the heat-conducting base, and the expansion of the first material pushes the second material away from the heat-conducting base; or, the contraction of the first material causes the second material to move closer to the heat-conducting base. The lamp panel assembly has multiple light-emitting zones, and the heat-conducting base transfers the heat from the light-emitting zones to the first material; The frame, together with the first material, the second material, and the heat-conducting base, forms a light-reflecting system, which includes multiple heat-dissipating zones; wherein each heat-dissipating zone corresponds to one or more of the light-emitting zones. The first material is a material that expands and contracts with temperature; the second material is a mixture of liquid and light-reflecting particles. The frame is a transparent and hollow plastic frame.

2. The backlight module according to claim 1, characterized in that, The heat-conducting base covers the hollow cavity to form a first cavity and a second cavity that are interconnected; wherein, the first cavity is filled with the first material and the second material, the first material expands due to the heat transferred by the heat-conducting base from the lamp panel assembly, pushing a portion of the second material into the second cavity; or the heat-conducting base does not transfer the heat of the lamp panel assembly to the first material, the first material contracts, so that the second material falls back from the second cavity into the first cavity.

3. The backlight module according to claim 2, characterized in that, Each of the aforementioned heat dissipation zones is equipped with: Multiple heat dissipation elements are disposed on the side of the heat-conducting base near the lamp panel assembly to transfer heat from the light-emitting zone; The first material is disposed in contact with a plurality of heat dissipation elements to expand or contract due to the heat transferred by the heat dissipation elements to the light-emitting zone.

4. The backlight module according to claim 2, characterized in that, The end face of the frame away from the heat-conducting base has: An exhaust port, which communicates with the second cavity; A waterproof and breathable membrane covers the vent holes.

5. The backlight module according to claim 2, characterized in that, The framework includes: The main body has a welding surface at the end near the heat-conducting base, through which the main body is fixedly connected to the heat-conducting base; the main body has a first groove; A protrusion extends from the surface of the body portion away from the heat-conducting base to the side away from the body portion; the protrusion has a second groove, the second groove communicating with the first groove; The first groove and the heat-conducting base form the first cavity, and the second groove forms the second cavity.

6. The backlight module according to claim 4, characterized in that, The waterproof and breathable membrane is a one-way breathable but waterproof material; the heat-conducting base is a copper disc base.

7. A display device, characterized in that, include: Display panel; A backlight module, electrically connected to the display panel, is used to provide a light source for the display panel; The backlight module is the backlight module according to any one of claims 1 to 6; wherein the light reflection system is disposed between the display panel and the back plate.

8. The display device according to claim 7, characterized in that, Also includes: An optical film is disposed between the back plate and the display panel; The light reflection system is disposed between the optical film and the back plate.

9. A method for manufacturing a display device, wherein the display device is the display device according to claim 7 or 8, characterized in that, The preparation method includes: A thermally conductive base and a frame are provided; wherein the frame has a hollow cavity; The second material and the first material are sequentially filled into the hollow cavity; The heat-conducting base and the frame are fixedly connected to form a closed cavity, and a waterproof and breathable membrane is covered on the end face of the frame away from the heat-conducting base. The surface of the heat-conducting base away from the frame is fixed to the lamp panel assembly; Fix the light panel assembly to the back plate; The backplate, optical film, and display panel are assembled sequentially.

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