Heat-dissipating MiniLED direct-lit backlight module and display device

Abstract

The present application relates to the field of MiniLED display technology, and in particular to a heat-dissipating MiniLED direct-type backlight module and display device. The heat-dissipating MiniLED direct-type backlight module includes a backplane, a MiniLED light source, and a heat dissipation component. One side of the backplane is a light-emitting surface, and the other side is a heat dissipation surface. The MiniLED light source is connected to the light-emitting surface of the backplane, and the heat dissipation component is arranged on the heat dissipation surface of the backplane. There are multiple groups of heat dissipation component arrays, and the heat dissipation component includes a heat dissipation fan, a first heat-conducting tube, a second heat-conducting tube and a connecting pipe. The air outlet of the heat dissipation fan faces the heat dissipation surface of the backplane. The first heat-conducting tube is located between the backplane and the heat dissipation fan, and the first heat-conducting tube is connected to the heat dissipation surface of the backplane. The inner diameter of the first heat-conducting tube gradually increases in the direction away from the backplane, and the inner diameter of the second heat-conducting tube gradually decreases in the direction away from the backplane. The connecting pipe is connected between the first heat-conducting tube and the second heat-conducting tube. The present application improves the heat dissipation performance of the Mini LED display.

Description

Technical Field

[0001] The present application relates to the field of MiniLED display technology, and in particular to a heat-dissipating MiniLED direct-type backlight module and display device. Background Art

[0002] MiniLED (full name: Mini Light Emitting Diode), also known as "sub-millimeter light-emitting diode", refers to a display screen composed of LED light sources with chip sizes between 50 microns and 200 microns. MiniLED display screens are a category of LCD (full name: Liquid Crystal Display) display screens. They upgrade the entire backlight in traditional LCD displays to hundreds or thousands of partitioned backlights, so that the display contrast can compete with OLED (full name: Organic Light Emitting Diode) displays. At the same time, compared with OLED displays, MiniLED displays have a longer service life.

[0003] However, the backlight of the MiniLED direct-type display has a large number of LED lamp beads, which will accumulate a lot of heat on the back of the display, and requires higher heat dissipation of the device. Summary of the invention

[0004] In order to improve the heat dissipation performance of the Mini LED display, the present application provides a heat dissipation type Mini LED direct-type backlight module and a display device.

[0005] In a first aspect, the present application provides a heat dissipation type MiniLED direct-type backlight module, comprising a backplane, a MiniLED light source, and a heat dissipation component; one side of the backplane is a light-emitting surface, and the other side is a heat dissipation surface; the MiniLED light source is connected to the light-emitting surface of the backplane, the heat dissipation component is arranged on the heat dissipation surface of the backplane, the heat dissipation component array has multiple groups, and the heat dissipation component comprises:

[0006] A cooling fan, wherein the air outlet of the cooling fan faces the cooling surface of the back plate;

[0007] a first heat-conducting tube, the first heat-conducting tube being located between the back plate and the heat-dissipating fan, the first heat-conducting tube being connected to the heat-dissipating surface of the back plate, the inner diameter of the first heat-conducting tube gradually increasing in a direction away from the back plate, and the first heat-conducting tube being connected to an air outlet of the heat-dissipating fan;

[0008] A second heat-conducting tube, one end of which is connected to the heat dissipation surface of the back plate, and the inner diameter of the second heat-conducting tube gradually decreases in a direction away from the back plate;

[0009] A connecting tube is connected between the first heat-conducting tube and the second heat-conducting tube, and the first heat-conducting tube and the second heat-conducting tube are communicated through the connecting tube.

[0010] By adopting the above technical solution, multiple heat dissipation components can achieve zoned heat dissipation of the backplane, which is better suitable for the characteristics of the zoned backlight of MiniLED. The zoned heat dissipation can finely divide the heat dissipation area of ​​the backplane to improve the heat dissipation efficiency and uniformity.

[0011] The first heat-conducting tube and the second heat-conducting tube both achieve contact heat dissipation with the back plate. Since the first heat-conducting tube and the second heat-conducting tube are both truncated cone-shaped tube structures, the inner wall of the first heat-conducting tube faces the air outlet of the fan, thereby forming a larger windward area, so that the heat dissipation fan can quickly cool down the first heat-conducting tube. The contact heat dissipation area of ​​the second heat-conducting tube and the back plate is larger, which improves the contact heat dissipation efficiency of the second heat-conducting tube and the back plate. The second heat-conducting tube makes up for the heat dissipation defect of the end of the first heat-conducting tube facing the heat dissipation fan to the back plate shielding part.

[0012] The cooling fan blows air toward the first heat-conducting tube, and the flowing air flows from the first heat-conducting tube to the second heat-conducting tube through the connecting tube. When the air pressure inside the second heat-conducting tube increases, the air in the second heat-conducting tube is discharged from the small hole of the second heat-conducting tube away from the back plate. Thus, the setting of the connecting tube forms an orderly air flow path, and the cooperation of the first heat-conducting tube, the cooling fan and the connecting tube makes up for the defect that the air inside the second heat-conducting tube is not easy to be discharged.

[0013] The above technical solution achieves the purpose of zoned heat dissipation of the MiniLED display through the mutual cooperation of the first heat-conducting tube, the second heat-conducting tube, the connecting tube, and the heat dissipation fan, and also enables the heat dissipation surface of the back plate to have an orderly air circulation path and sufficient contact heat dissipation area, thereby effectively improving the heat dissipation effect of the MiniLED display.

[0014] Optionally, one end of the connecting tube close to the second heat-conducting tube is inclined toward the back plate.

[0015] By adopting the above technical solution, when the end of the connecting pipe close to the second heat-conducting tube discharges air, the wind direction can be directed toward the back plate, so that the flowing air first contacts the back plate, further improving the heat dissipation effect on the back plate.

[0016] Optionally, one end of the connecting tube close to the second heat-conducting tube is connected to a limiting ring, the limiting ring is tightly attached to the inner wall of the second heat-conducting tube, and one end of the connecting tube close to the first heat-conducting tube is detachably connected to a limiting member, the limiting member is tightly attached to the inner wall of the first heat-conducting tube.

[0017] By adopting the above technical solution, since the first heat-conducting tube and the second heat-conducting tube are both truncated cone-shaped sleeves, it is convenient to install the connecting tube on the side with larger openings of the first heat-conducting tube and the second sleeve, and the connection between the first heat-conducting tube, the second heat-conducting tube and the connecting tube can be quickly achieved by using the mutual cooperation of the limiting member and the limiting ring.

[0018] Optionally, the limiting member is a nut, an outer wall of one end of the connecting tube close to the first heat-conducting tube has a thread, and the nut is threadedly connected to the connecting tube.

[0019] By adopting the above technical solution and utilizing the thread cooperation between the nut and the connecting pipe, the connecting pipe can be quickly installed.

[0020] Optionally, a limiting groove for accommodating the limiting ring is formed on the inner wall of the second heat-conducting cylinder.

[0021] By adopting the above technical solution, the limiting groove provides installation space for the limiting ring, thereby reducing the extent to which the limiting ring protrudes from the inner surface of the second heat-conducting tube, making the inner surface of the second heat-conducting tube as smooth as possible and air flow is not easily obstructed.

[0022] Optionally, the first heat-conducting tube corresponds to a plurality of the second heat-conducting tubes, and the plurality of the second heat-conducting tubes are arranged around the first heat-conducting tube.

[0023] By adopting the above technical solution, since the heat dissipation assembly has multiple groups, the number of heat dissipation fans can be reduced by designing one first heat-conducting tube to correspond to multiple second heat-conducting tubes, thereby further saving costs and reducing the noise caused by the fans.

[0024] Optionally, a light heat-conducting layer is filled between the first heat-conducting tube and the second heat-conducting tube.

[0025] By adopting the above technical solution, the lightweight heat-conducting layer can further improve the heat conduction efficiency of the first heat-conducting tube, the second heat-conducting tube and the back plate, improve the heat dissipation effect, and is not prone to generating a large weight burden.

[0026] Optionally, the lightweight heat-conducting layer is a graphite layer.

[0027] By adopting the above technical solution and utilizing the better thermal conductivity and lighter weight of the graphite layer, the purpose of better heat dissipation and lighter weight of the MiniLED display can be met.

[0028] Optionally, the inner wall of the first sleeve is coated with a diamond coating.

[0029] By adopting the above technical solution, the diamond coating has a strong thermal conductivity, so that heat can be accumulated on the inner wall surface of the first sleeve. With the cooperation of the first sleeve and the cooling fan, the cooling fan can quickly take away the heat on the surface of the diamond coating, thereby achieving the purpose of efficient cooling.

[0030] In a second aspect, the present application provides a heat dissipation type MiniLED direct-type display device, comprising a display screen and the heat dissipation type MiniLED direct-type backlight module.

[0031] By adopting the above technical solutions, the heat dissipation effect of the MiniLED display is effectively improved.

[0032] In summary, the present application includes at least one of the following beneficial technical effects:

[0033] 1. The purpose of zoned heat dissipation of the MiniLED display is achieved through the action of multiple groups of heat dissipation components; the heat dissipation components include a first heat-conducting tube, a second heat-conducting tube, a connecting pipe and a heat dissipation fan, so that the heat dissipation surface of the back plate has an orderly air circulation path and sufficient contact heat dissipation area, thereby effectively improving the heat dissipation effect of the MiniLED display.

[0034] 2. The connecting pipe is arranged at an angle relative to the back plate, and when the connecting pipe discharges air toward the second heat-conducting tube, the wind direction can be directed toward the back plate, thereby further improving the heat dissipation effect on the back plate.

[0035] 3. The side with the larger opening of the first heat-conducting tube and the second sleeve is convenient for installing the connecting pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of the heat dissipation type MiniLED direct-type backlight module of Example 1 of the present application.

[0037] Figure 2 It is a schematic diagram of the structure of the heat dissipation assembly and the mounting cover of Example 1 of the present application.

[0038] Figure 3 It is a schematic diagram of the overall structure of the heat dissipation type MiniLED direct-type backlight module from another perspective of Example 1 of the present application.

[0039] Figure 4 It is a schematic diagram of the structure of the heat dissipation assembly of Example 1 of the present application.

[0040] Figure 5 It is a front view of the first heat-conducting tube and the second heat-conducting tube of Example 1 of the present application.

[0041] Figure 6 yes Figure 5 AA section view.

[0042] Figure 7 Figure 6 Enlarged view of part B in .

[0043] Figure 8 It is a schematic diagram of the structure of the second heat-conducting tube of Example 1 of the present application.

[0044] Description of reference numerals:

[0045] 1. Back panel; 2. MiniLED lamp beads; 3. Installation cover; 31. Installation frame; 32. Protective plate; 321. Air inlet group; 322. Air outlet group; 4. Cooling fan; 5. First heat-conducting tube; 6. Second heat-conducting tube; 61. Limiting groove; 7. Connecting pipe; 71. Limiting ring; 72. Nut. DETAILED DESCRIPTION

[0046] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, the information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other.

[0047] The following is combined with Figure 1-8 This application is described in further detail.

[0048] Example 1

[0049] Embodiment 1 of the present application discloses a heat dissipation type MiniLED direct-type backlight module.

[0050] Reference Figure 1 The heat dissipation type MiniLED direct-type backlight module includes a back panel 1, a MiniLED light source and a heat dissipation component. One side of the back panel 1 is a light-emitting surface, and the other side is a heat dissipation surface. The MiniLED light source is composed of a plurality of MiniLED lamp beads 2 arrays, and the MiniLED light source is fixed on the light-emitting surface of the back panel 1.

[0051] Reference Figure 1 and Figure 2 The heat dissipation surface of the back plate 1 is fixedly connected with a mounting cover 3, and the heat dissipation component is installed in the mounting cover 3. There are multiple heat dissipation component arrays. In this embodiment, the number of heat dissipation components is 8, thereby realizing partitioned heat dissipation of the back plate 1.

[0052] Reference Figure 1 The mounting cover 3 includes a mounting frame 31 and a protective plate 32. The mounting frame 31 is a square annular frame, the protective plate 32 is fixedly connected to the mounting frame 31, the mounting frame 31 is fixed to the heat dissipation surface of the back plate 1, and the mounting frame 31 is located between the back plate 1 and the protective plate 32.

[0053] Reference Figure 2 , Figure 3The protective plate 32 is provided with a plurality of air vent groups, each of which corresponds to a heat dissipation component. The air vent group includes an air inlet group 321 and four air outlet groups 322, and the four air outlet groups 322 are evenly arranged around the air inlet group 321. The air inlet group 321 includes a plurality of air inlets, and the air outlet group 322 includes a plurality of air outlets. Thus, the plurality of air vent groups make the mounting cover 3 hollow.

[0054] Reference Figure 3 , Figure 4 The heat dissipation assembly includes a heat dissipation fan 4, a first heat-conducting tube 5, a second heat-conducting tube 6 and a connecting pipe 7. The heat dissipation fan 4 is fixed on the protective plate 32, and the heat dissipation fan 4 corresponds to the air inlet group 321 one by one, and the air inlet of the heat dissipation fan 4 is connected to the air inlet.

[0055] Reference Figure 1 , Figure 2 and Figure 4 The first heat-conducting tube 5 and the second heat-conducting tube 6 are both truncated cone-shaped, and the materials of the first heat-conducting tube 5 and the second heat-conducting tube 6 can be aluminum or copper. One end of the first heat-conducting tube 5 is attached to the back plate 1, and the other end faces the air outlet of the heat dissipation fan 4. The inner diameter of the first heat-conducting tube 5 gradually increases in the direction away from the back plate 1, so that the inner wall of the first heat-conducting tube 5 is inclined toward the air outlet of the heat dissipation fan 4, and then after the first heat-conducting tube 5 absorbs the heat on the back plate 1, the heat on the first heat-conducting tube 5 can be quickly cooled by the heat dissipation fan 4. It is not easy for heat to accumulate inside the first heat-conducting tube 5.

[0056] Reference Figure 4 The inner wall of the first heat-conducting tube 5 is coated with a diamond coating, which utilizes the strong thermal conductivity of diamond to quickly gather heat, and utilizes the heat dissipation fan 4 to quickly dissipate the heat on the surface of the diamond coating, thereby further improving the heat dissipation effect.

[0057] Reference Figure 1 , Figure 2 and Figure 4 , one end of the second heat-conducting tube 6 is attached to the back plate 1, and the inner diameter of the second heat-conducting tube 6 gradually decreases in the direction away from the back plate 1. The projection of the first heat-conducting tube 5 on the back plate 1 partially overlaps with the projection of the second heat-conducting tube 6 on the back plate 1, so that the end of the first heat-conducting tube 5 close to the heat dissipation fan 4 forms a shielding to the back plate 1 due to its larger diameter, and the second heat-conducting tube 6 makes up for the defect of the back plate 1 being shielded by the first heat-conducting tube 5. The contact area between the second heat-conducting tube 6 and the back plate 1 is larger, thereby ensuring the contact and heat dissipation area between the heat dissipation component and the back plate 1 as much as possible.

[0058] Reference Figure 2 , Figure 3There are four second heat-conducting tubes 6 in each heat dissipation assembly, and the four second heat-conducting tubes 6 are evenly distributed around the first heat-conducting tube 5. The second heat-conducting tubes 6 are arranged in a one-to-one correspondence with the air outlet group 322, and the end of the second heat-conducting tube 6 away from the back plate 1 faces the air outlet. Adjacent second heat-conducting tubes 6 abut against each other, and the first heat-conducting tube 5 abuts against the four second heat-conducting tubes 6 at the same time.

[0059] Reference Figure 2 There are multiple connecting tubes 7 and they are arranged one by one with the second heat-conducting tubes 6 . The connecting tubes 7 are connected between the first heat-conducting tube 5 and the second heat-conducting tube 6 . The first heat-conducting tube 5 and the second heat-conducting tube 6 are connected through the connecting tubes 7 .

[0060] Reference Figure 5 , Figure 6 , Figure 7 , the axis of the connecting pipe 7 and the back plate 1 (refer to Figure 1 ) is an acute angle, that is, the connecting tube 7 is arranged obliquely relative to the back plate 1, and the end of the connecting tube 7 close to the second heat-conducting tube 6 is inclined toward the back plate 1.

[0061] Reference Figure 4 and Figure 7 The end of the connecting tube 7 close to the first heat-conducting tube 5 is arranged toward the heat-dissipating fan 4, so that the air discharged by the heat-dissipating fan 4 can be easily blown into the connecting tube 7, thereby guiding the wind into the second heat-conducting tube 6, increasing the air pressure in the second heat-conducting tube 6, so that the air in the second heat-conducting tube 6 is orderly discharged from the end of the second heat-conducting tube 6 away from the back plate 1, and avoiding the heat accumulation in the second heat-conducting tube 6 as much as possible. It is difficult to dissipate, and the heat dissipation effect of the second heat-conducting tube 6 is improved. The air discharged from the second heat-conducting tube 6 is finally discharged from the mounting cover 3 through the air outlet.

[0062] Reference Figure 7 and Figure 8 The end of the connecting tube 7 close to the second heat-conducting tube 6 is fixedly connected to a limiting ring 71, and the limiting ring 71 is pressed against the inner wall of the second heat-conducting tube 6. A limiting groove 61 for accommodating the limiting ring 71 is provided on the tube wall of the second heat-conducting tube 6. The limiting ring 71 is partially inserted in the limiting groove 61. The setting of the limiting groove 61 makes it difficult for the limiting ring 71 to protrude too much from the inner wall of the second heat-conducting tube 6 to interfere with the air flow.

[0063] Reference Figure 7The outer surface of one end of the connecting tube 7 close to the first heat-conducting tube 5 has a thread, and the end of the connecting tube 7 close to the first heat-conducting tube 5 is threadedly connected with a nut 72, and the nut 72 is tightly pressed against the inner wall of the first heat-conducting tube 5. Under the limiting action of the nut 72 and the limit ring 71, the first heat-conducting tube 5, the second heat-conducting tube 6 and the connecting tube 7 are fixed to each other. The first heat-conducting tube 5 can be adhered to the back plate 1 by heat-conducting glue, so that the second heat-conducting tube 6 is fixed by fixing the first heat-conducting tube 5. The contact area between the second heat-conducting tube 6 and the back plate 1 is large, so that the heat-conducting glue is not applied to ensure the maximum contact heat dissipation efficiency.

[0064] In addition, in order to improve the heat conduction efficiency between the first heat-conducting tube 5 and the second heat-conducting tube 6, graphite can be filled in the gap between the outer wall of the first heat-conducting tube 5 and the outer wall of the second heat-conducting tube 6 to form a graphite layer (not shown in the drawings). Graphite has the advantages of light weight and good thermal conductivity, thereby improving the heat conduction efficiency of the first heat-conducting tube 5 and the second heat-conducting tube 6 and improving the uniformity of heat dissipation of the back plate 1.

[0065] The implementation principle of a heat dissipation type MiniLED direct-type backlight module in Example 1 of the present application is: when dissipating the heat of the back panel 1 installed with a MiniLED light source, multiple groups of heat dissipation components are used to perform zone heat dissipation on the back panel 1 to achieve the purpose of efficient and uniform heat dissipation.

[0066] The heat dissipation fan 4 draws air through the air inlet hole, and then blows air toward the inner wall of the first heat-conducting tube 5 and the back plate 1. Through the larger windward surface of the first heat-conducting tube 5 and the strong heat-conducting property of the diamond coating, the first heat-conducting tube 5 is cooled quickly after absorbing the heat on the back plate 1. The second heat-conducting tube 6 makes up for the defect of the first heat-conducting tube 5 shielding the back plate 1, increases the contact heat-conducting area between the heat dissipation component and the back plate 1, and thus ensures the contact heat dissipation effect of the back plate 1.

[0067] The connecting pipe 7 is arranged at an angle so as to better guide the wind direction. After the heat dissipation fan 4 discharges the wind, the wind is passed into the second heat-conducting tube 6 from the connecting pipe 7, so that the air pressure in the inner cavity of the second heat-conducting tube 6 increases, and the gas in the second heat-conducting tube 6 is discharged from the end of the second heat-conducting tube 6 away from the back plate 1, and finally the flowing gas is discharged from the air outlet, thereby reducing the possibility of heat accumulation in the inner cavity of the second heat-conducting tube 6, and further improving the heat dissipation effect of the back plate 1.

[0068] Under the action of the graphite layer, efficient heat conduction is achieved between the first heat-conducting tube 5 and the plurality of second heat-conducting tubes 6 , thereby improving the uniformity of heat dissipation of the back plate 1 .

[0069] Example 2

[0070] Embodiment 2 of the present application discloses a heat dissipation type MiniLED direct-type display device, comprising a display screen and the heat dissipation type MiniLED direct-type backlight module in Embodiment 1. Since the heat dissipation type MiniLED direct-type backlight module has the effect of zoned heat dissipation, under the combination of orderly air flow heat dissipation and good contact heat dissipation, the heat dissipation type MiniLED direct-type display device has a good heat dissipation effect.

[0071] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A heat dissipation type MiniLED direct-type backlight module, characterized in that: The device comprises a back plate (1), a MiniLED light source, and a heat dissipation component; one side of the back plate (1) is a light-emitting surface, and the other side is a heat dissipation surface; the MiniLED light source is connected to the light-emitting surface of the back plate (1), the heat dissipation component is arranged on the heat dissipation surface of the back plate (1), the heat dissipation surface of the back plate (1) is fixedly connected to a mounting cover (3), the mounting cover (3) comprises a mounting frame (31) and a protective plate (32), the protective plate (32) is provided with a plurality of air vent groups, the air vent groups comprise an air inlet group (321) and an air outlet group (322), the air inlet group (321) comprises a plurality of air inlet holes, and the air outlet group (322) comprises a plurality of air outlet holes; The heat dissipation component array has multiple groups, and the heat dissipation component includes: a cooling fan (4), wherein the air outlet of the cooling fan (4) faces the cooling surface of the back plate (1), the cooling fan (4) corresponds to the air inlet group (321) one by one, and the air inlet of the cooling fan (4) is connected to the air inlet; a first heat-conducting tube (5), the first heat-conducting tube (5) being located between the back plate (1) and the heat-dissipating fan (4), the first heat-conducting tube (5) being connected to the heat-dissipating surface of the back plate (1), the inner diameter of the first heat-conducting tube (5) gradually increasing in a direction away from the back plate (1), and the first heat-conducting tube (5) being connected to an air outlet of the heat-dissipating fan (4); a second heat-conducting tube (6), one end of the second heat-conducting tube (6) being connected to the heat dissipation surface of the back plate (1), the inner diameter of the second heat-conducting tube (6) gradually decreasing in a direction away from the back plate (1), the second heat-conducting tube (6) being arranged in a one-to-one correspondence with the air outlet group (322), the end of the second heat-conducting tube (6) away from the back plate (1) facing the air outlet, the projection of the first heat-conducting tube (5) on the back plate (1) partially overlaps with the projection of the second heat-conducting tube (6) on the back plate (1), the first heat-conducting tube (5) corresponds to a plurality of the second heat-conducting tubes (6), and the plurality of the second heat-conducting tubes (6) are arranged around the first heat-conducting tube (5); A connecting tube (7) is connected between the first heat-conducting tube (5) and the second heat-conducting tube (6), and the connecting tube (7) is arranged at an angle relative to the back plate (1); the first heat-conducting tube (5) and the second heat-conducting tube (6) are connected through the connecting tube (7); one end of the connecting tube (7) close to the second heat-conducting tube (6) is inclined toward the back plate (1); and one end of the connecting tube (7) close to the first heat-conducting tube (5) is arranged toward the cooling fan (4).

2. The heat dissipation type MiniLED direct-lit backlight module according to claim 1, characterized in that: One end of the connecting tube (7) close to the second heat-conducting tube (6) is connected to a limiting ring (71), and the limiting ring (71) is tightly attached to the inner wall of the second heat-conducting tube (6). One end of the connecting tube (7) close to the first heat-conducting tube (5) is detachably connected to a limiting member, and the limiting member is tightly attached to the inner wall of the first heat-conducting tube (5).

3. The heat dissipation type MiniLED direct-lit backlight module according to claim 2, characterized in that: The limiting member is a nut (72), and an outer wall of one end of the connecting tube (7) close to the first heat-conducting tube (5) has a thread.

4. The heat dissipation type MiniLED direct-lit backlight module according to claim 2, characterized in that: The inner wall of the second heat-conducting cylinder (6) is provided with a limiting groove (61) for accommodating the limiting ring (71).

5. The heat dissipation type MiniLED direct-lit backlight module according to claim 1, characterized in that: A light heat-conducting layer is filled between the first heat-conducting tube (5) and the second heat-conducting tube (6).

6. The heat dissipation type MiniLED direct-lit backlight module according to claim 5, characterized in that: The lightweight heat-conducting layer is a graphite layer.

7. The heat dissipation type MiniLED direct-lit backlight module according to claim 1, characterized in that: The inner wall of the first heat-conducting tube (5) and / or the second heat-conducting tube (6) is coated with a diamond coating.

8. A heat dissipation type MiniLED direct-type display device, characterized in that: It comprises a display screen and the heat dissipation type MiniLED direct-down backlight module described in any one of claims 1 to 7.

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