Mini LED backlight module

Abstract

The invention discloses a Mini LED backlight module, and relates to the technical field of Mini LEDs, the Mini LED backlight module comprises a backlight plate, one side of the backlight plate is a mounting part, the other opposite side of the backlight plate is a heat dissipation part, and the backlight plate is provided with a glue groove; the lamp panel abuts against the mounting part, the glue groove is located between the backlight plate and the lamp panel, and the glue groove extends along the edge position of the lamp panel; the heat-conducting glue is poured into the glue groove, the lamp panel and the backlight plate are fixed through the heat-conducting glue, a closed cavity is formed between the lamp panel and the backlight plate, and the closed cavity is surrounded by the heat-conducting glue; a sliding groove is formed in the backlight plate, a sliding plate located in the sliding groove is arranged on the backlight plate in an up-down sliding mode, and a sealing piece slidably connected with the sliding groove is arranged on the peripheral side wall of the sliding plate. The backlight plate is provided with a plurality of exhaust holes communicating with the closed cavity and the sliding groove. The control assembly is arranged on the backlight plate, and when the lamp panel transmits heat to the backlight plate, the control assembly controls the sliding plate to slide towards the side away from the closed cavity. The heat dissipation effect of the LED lamp panel can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of Mini LED, in particular to a Mini LED backlight module. BACKGROUND

[0002] The Mini LED backlight module is a high-order display technology component using small-size LED chips as a backlight source, realizing high brightness, high contrast and excellent color performance through high-density LED array and local dimming technology, and is widely used in the fields of television, display, vehicle-mounted screen and the like.

[0003] At present, the backlight module comprises a back plate, a connecting layer and an LED lamp plate which are sequentially abutted with each other, the connecting layer is heat-conducting glue, the back plate and the LED lamp plate are connected and fixed through the heat-conducting glue, the heat generated by the LED lamp plate is transmitted to the back plate through the heat-conducting glue, and then is dissipated to the surrounding through the back plate, so as to realize heat dissipation of the LED lamp plate.

[0004] However, when the LED lamp plate dissipates heat, the heat is first transmitted to the heat-conducting glue and then is transmitted to the back plate through the heat-conducting glue, so that the heat dissipation speed of the LED lamp plate is slow, and the heat dissipation effect of the LED lamp plate is affected. SUMMARY

[0005] In order to improve the heat dissipation effect of the LED lamp plate, the present application provides a Mini LED backlight module.

[0006] The present application provides a Mini LED backlight module, which adopts the following technical scheme: A Mini LED backlight module comprises a backlight plate, the one side of the backlight plate is a mounting portion, the other side opposite to the mounting portion is a heat dissipation portion, the backlight plate is provided with a glue groove; a lamp plate is abutted and arranged on the mounting portion, the glue groove is located between the backlight plate and the lamp plate, and the glue groove extends along the edge position of the lamp plate; heat-conducting glue is filled in the glue groove, the heat-conducting glue fixes the lamp plate and the backlight plate, a closed cavity is formed between the lamp plate and the backlight plate, and the heat-conducting glue surrounds the closed cavity; a sliding groove is formed in the backlight plate, a sliding plate located in the sliding groove is arranged on the backlight plate in a sliding manner, and a sealing element in sliding connection with the sliding groove is arranged on the side wall of the sliding plate; the backlight plate is provided with a plurality of air extraction holes which are in communication with the closed cavity and the sliding groove; a control assembly is arranged on the backlight plate, when the lamp plate transmits heat to the backlight plate, the control assembly controls the sliding plate to slide away from the closed cavity.

[0007] By adopting the technical scheme, the backlight plate, the lamp plate and the heat-conducting glue are arranged, the lamp plate and the backlight plate are fixed by pouring the heat-conducting glue into the glue groove, and a closed cavity is formed between the two, so that the positions of the backlight plate and the lamp plate can be effectively fixed; the sliding groove and the air extraction hole are arranged in the backlight plate, and the sliding plate and the sealing element are matched, when the lamp plate transmits heat to the backlight plate, the control assembly can control the sliding plate to slide away from the closed cavity, the heat dissipation speed of the lamp plate is accelerated, the air in the closed cavity can be extracted, the backlight plate and the lamp plate are more fully abutted, the direct contact area is increased, and the heat dissipation effect is improved.

[0008] Optionally, the control assembly comprises a control column, a control block and a heat-absorbing expansion block. The control column is arranged on the side of the sliding plate away from the closed cavity and slides on the backlight plate, the control block is arranged on the side of the control column away from the sliding groove, and the backlight plate is provided with a control groove for sliding of the control block. The heat-absorbing expansion block is arranged on the side of the control block close to the sliding groove, and the outer wall of the heat-absorbing expansion block is in abutment with the groove wall of the control groove.

[0009] By adopting the technical scheme, the control column, the control block and the heat-absorbing expansion block constitute the control assembly, when the lamp plate transmits heat to the backlight plate, the heat-absorbing expansion block is heated and expanded, the control block and the control column connected therewith are pushed to move, and then the sliding plate slides away from the closed cavity, so that the air in the closed cavity can be extracted through the air extraction hole, the heat dissipation speed of the lamp plate is accelerated, and the heat dissipation effect is improved.

[0010] Optionally, the backlight plate is provided with a ventilation hole penetrating to the outside and communicating with the control groove.

[0011] By adopting the technical scheme, the ventilation hole can communicate the control groove with the outside, the air pressure in the control groove is stable when the heat-absorbing expansion block is expanded or contracted, the normal sliding of the sliding plate is avoided, the control assembly can more accurately and effectively control the movement of the sliding plate, and the stability and reliability of the heat dissipation system are enhanced.

[0012] Optionally, the sealing element is a sealing ring, the sealing ring is embedded and fixed on the side wall of the sliding plate, and the sealing ring is in sliding connection with the groove wall of the sliding groove.

[0013] By adopting the technical scheme, the sealing ring is used as the sealing element and is in sliding connection with the side wall of the sliding plate and the groove wall of the sliding groove, so that the sliding plate can be kept in good sealing during sliding, the possibility of gas exchange between the closed cavity and the outside is reduced, the sliding plate slides away from the closed cavity when the control assembly controls the sliding plate to slide away from the closed cavity during the transmission of heat from the lamp plate to the backlight plate, the direct contact area of the lamp plate and the backlight plate is increased, effective heat dissipation is realized, and the heat dissipation effect of the lamp plate is improved.

[0014] Optionally, a connecting strip is arranged on the side of the lamp panel facing the backlight panel, and the connecting strip is inserted into the glue groove.

[0015] By adopting the above technical solution, the connecting strip is arranged on the side of the lamp panel facing the backlight panel and inserted into the glue groove, which can increase the contact area and connection stability of the lamp panel and the backlight panel, and also can increase the heat conduction path, which helps to improve the heat transfer efficiency of the lamp panel to the backlight panel and improve the heat dissipation effect.

[0016] Optionally, a limiting strip is arranged on the side wall of the connecting strip and inserted into the glue groove.

[0017] By adopting the above technical solution, the limiting strip is arranged on the side wall of the connecting strip and inserted into the glue groove, which can further enhance the connection stability between the lamp panel and the backlight panel and make the connection of the two more firm.

[0018] Optionally, the glue groove is a dovetail groove structure.

[0019] By adopting the above technical solution, the glue groove with a dovetail groove structure can more stably accommodate the heat-conducting glue, the connection of the lamp panel and the backlight panel is more firm, the possibility of loosening or displacement between the lamp panel and the backlight panel is reduced, and the stability of the entire Mini LED backlight module is improved.

[0020] Optionally, a plurality of connecting blocks are uniformly and spacedly arranged on the side of the lamp panel facing the backlight panel, the backlight panel is provided with connecting grooves for clamping the connecting blocks, and the connecting grooves are arranged in a staggered manner with the air exhaust holes.

[0021] By adopting the above technical solution, the connecting block and the connecting groove structure are additionally arranged between the lamp panel and the backlight panel, which can enhance the connection stability of the two, and the connecting groove is arranged in a staggered manner with the air exhaust hole to reduce the possibility of affecting the air exhaust function and ensure the normal heat transfer process.

[0022] In summary, the present application includes at least one of the following beneficial effects: 1. An enclosed cavity is formed between the lamp panel and the backlight panel, and the air in the enclosed cavity is exhausted, which can make the backlight panel and the lamp panel abut more fully, increase the direct contact area, accelerate the heat transfer of the lamp panel, and improve the heat dissipation speed; 2. The sealing ring is used as a sealing element and is embedded in the sliding connection between the side wall of the sliding plate and the side wall of the sliding groove, which can ensure that the sliding plate maintains good sealing during sliding, reduces the possibility of gas exchange between the enclosed cavity and the outside, and controls the sliding plate to slide away from the enclosed cavity when the lamp panel transmits heat to the backlight panel. The control assembly increases the direct contact area of the lamp panel and the backlight panel, realizes effective heat dissipation, and improves the heat dissipation effect of the lamp panel. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is an external structure schematic diagram of an embodiment of the present application; Figure 2 is a schematic diagram of the internal structure of an embodiment of the present application; Figure 3 is a schematic diagram of the internal cross-section of an embodiment of the present application; Figure 4 is an enlarged schematic diagram of part A of Figure 3 ; Figure 5 is an enlarged schematic diagram of part B of Figure 3 .

[0024] Reference signs: 1, backlight plate; 11, mounting portion; 12, heat dissipation portion; 13, glue groove; 14, sliding groove; 15, air extraction hole; 16, control groove; 17, air hole; 18, connecting groove; 19, sliding groove; 2, lamp plate; 21, connecting strip; 22, limiting strip; 23, connecting block; 3, heat-conducting glue; 4, closed cavity; 5, sliding plate; 51, sealing ring; 6, control assembly; 61, control column; 62, control block; 63, heat-absorbing expansion block. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying Figures 1-5 The present application is further described in detail.

[0026] An embodiment of the present application discloses a Mini LED backlight module.

[0027] Referring to Figure 1 and Figure 2 , the Mini LED backlight module provided by the embodiment of the present application comprises a backlight plate 1 and a lamp plate 2, and the backlight plate 1 is provided with a mounting groove.

[0028] Referring to Figure 2 and Figure 3 , the backlight module further comprises a diffusion plate, which is mounted and fixed at the groove opening of the mounting groove. Specifically, the side of the mounting groove facing the groove opening is the mounting portion 11 of the backlight plate 1, and the lamp plate 2 is placed in abutment on the mounting portion 11, and the lamp plate 2 is tightly attached to the backlight plate 1, so that the heat generated by the lamp plate 2 can be transferred to the backlight plate 1. The other side of the backlight plate 1 opposite the mounting portion 11 is the heat dissipation portion 12, which is responsible for dissipating heat.

[0029] Referring to Figure 3 and Figure 4 , the mounting portion 11 of the backlight plate 1 is provided with a glue groove 13 on one side, and the glue groove 13 is connected at the head and tail. When the lamp plate 2 is in abutment with the mounting portion 11, the glue groove 13 is located between the lamp plate 2 and the mounting portion 11. At the same time, when the lamp plate 2 is in abutment with the mounting portion 11, the glue groove 13 extends along the edge position of the lamp plate 2, and the shape can be annular or set according to the shape of the edge of the lamp plate 2.

[0030] The backlight module further comprises heat-conducting glue 3, which is filled in the glue groove 13 and accommodated by the glue groove 13, so that the heat-conducting glue 3 can firmly fix the lamp plate 2 and the backlight plate 1 together after solidification. When the heat-conducting glue 3 solidifies, the lamp plate 2 and the mounting portion 11 form a closed cavity 4, and the heat-conducting glue 3 surrounds the closed cavity 4, so that the closed cavity 4 has good sealing performance. The side of the lamp plate 2 facing the backlight plate 1 is fixedly connected with a connecting strip 21, which is inserted into the glue groove 13. The connecting strip 21 can be a plurality of rectangular strips arranged in a circumferential direction or a ring structure connected at the head and tail. The connecting strip 21 is made of the same material as the lamp plate 2 and serves to enhance the connection stability. Meanwhile, the heat of the lamp plate 2 can be transferred to the backlight plate 1 through the connecting strip 21.

[0031] The heat-conducting glue 3 can be organic silicon heat-conducting glue 3, which has good heat-conducting performance and bonding performance and is resistant to high and low temperatures and aging. Alternatively, the heat-conducting glue 3 can be epoxy resin heat-conducting glue 3, which has high bonding strength and large hardness after solidification.

[0032] The connecting strip 21 is provided with limiting strips 22, which are two and fixed to vertical side walls on opposite sides of the connecting strip 21. The limiting strips 22 are located away from the lamp plate 2. The limiting strips 22 are inserted into the glue groove 13 together with the connecting strip 21. The limiting strips 22 can be triangular, square or trapezoidal in shape, which can further limit the relative displacement between the lamp plate 2 and the backlight plate 1 and increase the connection strength between the lamp plate 2 and the backlight plate 1. The glue groove 13 has a dovetail groove structure, which can better limit the falling of the heat-conducting glue 3 and make the connection between the lamp plate 2 and the backlight plate 1 more stable.

[0033] The side of the lamp plate 2 facing the backlight plate 1 is also fixed with a plurality of connecting blocks 23 uniformly and at intervals. The backlight plate 1 is provided with connecting grooves 18, which correspond to the connecting blocks 23 one by one. The connecting blocks 23 are clamped into the connecting grooves 18. The connecting blocks 23 can be cylindrical or cuboid in structure. The cooperation between the connecting blocks 23 and the connecting grooves 18 further enhances the connection strength between the lamp plate 2 and the backlight plate 1 and increases the direct contact area between the lamp plate 2 and the backlight plate 1, thereby improving the heat transfer speed.

[0034] The backlight plate 1 is provided with a sliding groove 14, which extends away from the lamp plate 2 and is opposite to the middle of the closed cavity 4. The backlight plate 1 is provided with a plurality of air extraction holes 15, which are uniformly and at intervals arranged. One side of the air extraction hole 15 communicates with the closed cavity 4, and the other side communicates with the sliding groove 14. The air extraction hole 15 can be circular or elliptical in shape, and the number and size thereof are determined according to actual requirements.

[0035] The backlight plate 1 is provided with a sliding plate 5 which is connected to the sliding groove 14 in a sliding manner from top to bottom, and the peripheral side wall of the sliding plate 5 is connected to the peripheral groove wall of the sliding groove 14 in a sliding manner. The peripheral side wall of the sliding plate 5 is provided with a sealing element, which is a sealing ring 51 embedded and fixed to the peripheral side wall of the sliding plate 5 and connected to the peripheral groove wall of the sliding groove 14 in a sliding manner.

[0036] The sealing ring 51 can be made of rubber, which has good elasticity and sealing performance and can effectively prevent gas leakage; or can be made of silica gel, which has good high-temperature resistance. The cooperation of the sliding plate 5 and the sliding groove 14 can change the pressure and other conditions in the closed cavity 4, and the air in the closed cavity 4 is drawn into the sliding groove 14 through the air hole 15, which can promote heat exchange on the one hand and extract the air between the lamp plate 2 and the mounting portion 11 on the other hand, thereby reducing the gap between the lamp plate 2 and the mounting portion 11, increasing the direct contact area between the lamp plate 2 and the mounting portion 11, and improving the heat transfer efficiency between the lamp plate 2 and the mounting portion 11.

[0037] The backlight module further comprises a control assembly 6 arranged on the backlight plate 1, which can control the sliding plate 5 to slide away from the closed cavity 4 when the lamp plate 2 transmits heat to the backlight plate 1. Such structure and cooperation can effectively accelerate the heat dissipation speed of the lamp plate 2. After the sliding plate 5 is slid by the control assembly 6, the air pressure and other conditions in the closed cavity 4 can be changed, heat exchange can be promoted, the direct contact area between the lamp plate 2 and the mounting portion 11 can be increased, and thus the heat dissipation effect can be improved.

[0038] The control assembly 6 comprises a control column 61, a control block 62 and a heat-absorbing expansion block 63. A sliding groove 19 is formed in the groove wall of the sliding groove 14 away from the closed cavity 4, and the sliding groove 19 extends away from the closed cavity 4. The control column 61 is fixedly connected to the side of the sliding plate 5 away from the closed cavity 4, and the control column 61 is slidably arranged in the sliding groove 19, and the peripheral side wall of the control column 61 has a gap with the peripheral groove wall of the sliding groove 19. The control column 61 can be a cylindrical or square column, and the material thereof can be stainless steel which has high strength and is not easy to rust.

[0039] The control block 62 is fixedly connected to the peripheral side wall of the control column 61 and located away from the sliding groove 14. A control groove 16 is formed in the backlight plate 1, and the control groove 16 and the sliding groove 19 are in communication with each other, and the control block 62 is slidably arranged in the control groove 16. The shape of the control block 62 matches the control groove 16 so as to smoothly slide in the control groove 16.

[0040] The heat-absorbing expansion block 63 is fixedly connected to the control block 62 on the side close to the sliding groove 14, and the outer wall of the heat-absorbing expansion block 63 is in abutment with the groove wall of the control groove 16, so that the heat-absorbing expansion block 63 fills the space of the control groove 16 on the side close to the sliding groove 14 of the control block 62. The heat-absorbing expansion block 63 can be made of 4J50 iron-nickel constant expansion alloy, paraffin or other materials. After absorbing heat, the 4J50 iron-nickel constant expansion alloy expands, thereby pushing the control block 62 and the control column 61 to move, and further driving the sliding plate 5 to slide. When the 4J50 iron-nickel constant expansion alloy cools down, it shrinks, and the heat-absorbing expansion block 63 restores its deformation. At this time, the air flows back into the closed cavity 4, driving the control block 62 to slide towards the sliding groove 14, so that the lamp plate 2 is in a relaxed state, reducing the possibility of fatigue failure of the lamp plate 2 when not in use. The heat-absorbing expansion block 63 can also be made of some high-molecular intelligent materials which are sensitive to temperature changes and can more accurately control the sliding of the sliding plate 5.

[0041] The backlight plate 1 is provided with a ventilation hole 17 which penetrates to the outside of the backlight plate 1 and is in communication with the control groove 16. The ventilation hole 17 balances the air pressure in the control groove 16, ensuring that the control block 62 and the heat-absorbing expansion block 63 can work normally.

[0042] The implementation principle of the Mini LED backlight module according to an embodiment of the present application is as follows: When the lamp plate 2 generates heat and transmits it to the backlight plate 1, the heat is transferred to the heat-absorbing expansion block 63, which expands under the heat and pushes the control block 62 to slide in the control groove 16. The control block 62 drives the control column 61 to move, and the control column 61 drives the sliding plate 5 to slide away from the closed cavity 4. After the sliding plate 5 slides, the gas in the closed cavity 4 flows to the sliding groove 14 through the air outlet hole 15, changing the air pressure and other environments in the closed cavity 4, promoting heat exchange, increasing the direct contact area between the lamp plate 2 and the backlight plate 1, and accelerating the heat dissipation speed of the lamp plate 2. At the same time, the ventilation hole 17 balances the air pressure in the control groove 16, ensuring the normal operation of the control assembly 6. Compared with the traditional heat dissipation mode, this structure and control mode reduce the intermediate link of heat transfer, improve the heat dissipation efficiency, overcome the problem of slow heat dissipation in the prior art, and provide a new solution for efficient heat dissipation of the Mini LED backlight module, which has strong practicality and innovation.

[0043] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application. Therefore, any equivalent changes made on the basis of the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A Mini LED backlight module, characterized in that: Including the backlight board (1), one side of the backlight board (1) is the mounting portion (11), the other side is the heat dissipation portion (12), the backlight board (1) is provided with the glue groove (13); The lamp plate (2) is arranged in the mounting portion (11), the glue groove (13) is located between the backlight board (1) and the lamp plate (2), and the glue groove (13) extends along the edge position of the lamp plate (2); The heat-conducting glue (3) is filled in the glue groove (13), the heat-conducting glue (3) fixes the lamp plate (2) and the backlight board (1), and the lamp plate (2) and the backlight board (1) form a closed cavity (4), and the heat-conducting glue (3) surrounds the closed cavity (4); The backlight board (1) is provided with a sliding groove (14), and the sliding plate (5) is slidably arranged in the sliding groove (14) on the backlight board (1); The backlight board (1) is provided with a plurality of air extraction holes (15) communicating with the closed cavity (4) and the sliding groove (14); The control assembly (6) is arranged on the backlight board (1), and when the lamp plate (2) transmits heat to the backlight board (1), the control assembly (6) controls the sliding plate (5) to slide away from the closed cavity (4).

2. The Mini LED backlight module according to claim 1, characterized in that: The control assembly (6) comprises a control column (61), a control block (62) and a heat-absorbing expansion block (63); The control column (61) is arranged on the side of the sliding plate (5) away from the closed cavity (4) and slides on the backlight board (1), the control block (62) is arranged on the side wall of the control column (61) and away from the sliding groove (14), and the backlight board (1) is provided with a control groove (16) for sliding of the control block (62); The heat-absorbing expansion block (63) is arranged on the side of the control block (62) close to the sliding groove (14), and the peripheral outer wall of the heat-absorbing expansion block (63) abuts against the groove wall of the control groove (16).

3. The Mini LED backlight module according to claim 2, characterized in that: The backlight board (1) is provided with a ventilation hole (17) penetrating to the outside and communicating with the control groove (16).

4. The Mini LED backlight module according to claim 1, characterized in that: The sealing ring (51) is embedded and fixed on the peripheral side wall of the sliding plate (5), and the sealing ring (51) is slidably connected between the peripheral groove wall of the sliding groove (14).

5. The Mini LED backlight module according to claim 1, characterized in that: The connecting strip (21) is arranged on the side of the lamp plate (2) facing the backlight board (1), and the connecting strip (21) is inserted into the glue groove (13).

6. The Mini LED backlight module according to claim 5, characterized in that: The limiting strip (22) is arranged on the side wall of the connecting strip (21) and is inserted into the glue groove (13).

7. The Mini LED backlight module according to claim 6, characterized in that: The glue groove (13) is a dovetail groove structure.

8. The Mini LED backlight module according to claim 7, characterized in that: The lamp plate (2) is uniformly and spacedly provided with a plurality of connecting blocks (23) on the side facing the backlight board (1), the backlight board (1) is provided with a connecting groove (18) for clamping the connecting block (23), and the connecting groove (18) is arranged in a staggered manner with the air extraction hole (15).

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