Backlight module with multiple heat dissipation components

Abstract

The application discloses a backlight module with multiple heat dissipation components, and relates to the technical field of backlight sources.The backlight module comprises a base frame, a heat dissipation component for realizing a fixed-point heat dissipation effect, an opening and closing component for controlling the size of ventilation, and a filtering component for preventing dust from invading.The inside of the base frame is embedded with a light guide plate and a diaphragm group.The top inside of the base frame is embedded with an LED light bar.The side of the LED light bar is attached with a temperature guide strip.The inside of the base frame is provided with a flow guide groove.The longitudinal profile of the flow guide groove is gradually narrowed from bottom to top.The heat dissipation component is arranged to realize real-time sensing of the heating condition of the LED light bar and dynamic adjustment of the differentiated heat dissipation intensity.The opening and closing component is arranged to realize precise linkage control of the opening degree of the ventilation opening at the top of the module and the heat dissipation intensity.The filtering component is arranged to realize passive purification of the incoming air flow and active self-cleaning of the filter screen surface.

Description

Technical Field

[0001] This invention relates to the field of backlight technology, specifically to a backlight module with multiple heat dissipation components. Background Technology

[0002] The backlight module is a component located on the back of the display screen, consisting of a light source, a light guide plate, an optical film, and a supporting frame. Its core function is to convert point light sources or line light sources into uniform surface light sources, thereby providing the necessary light for the passively emitting liquid crystal display panel to present a clear image. However, the light-emitting elements in the backlight module convert most of the electrical energy into heat when working, causing the internal temperature of the module to rise significantly. Therefore, the backlight module is usually equipped with heat dissipation components. A search revealed Chinese patent CN120593245B, which includes a light guide positioning plate with a frame fixedly connected to its surface; and a heat dissipation mechanism installed on the side of the light guide positioning plate away from the frame. The heat dissipation mechanism includes a graphene heat-conducting plate fixedly connected to the side of the light guide positioning plate away from the frame. Multiple heat exchange components are installed on the other side of the graphene heat-conducting plate, and airflow guiding components are arranged between adjacent heat exchange components. While the heat exchange components exchange heat with the graphene heat-conducting plate, the combined action of the heat exchange components and the airflow guiding components can achieve a better cooling effect on the graphene heat-conducting plate, reducing the impact on the backlight's heat dissipation effect and ensuring the accuracy of the light demodulation reference frequency.

[0003] However, the heat dissipation design in the above scheme is mainly aimed at the light guide plate and optical film area, which is a surface heat dissipation architecture. For edge-lit backlight modules, the heat source is highly concentrated on the LED light strip on the side of the light guide plate. The heat dissipation structure needs to be directly attached to the light strip for point-to-point efficient heat dissipation. Therefore, the above scheme is not suitable for edge-lit backlight modules. In addition, the above scheme does not consider the problem of severe dust accumulation at the heat dissipation vents during long-term operation of the device. The risk of dust entering the device increases, which in turn reduces the heat dissipation efficiency and reduces the lifespan of the internal structure. Summary of the Invention

[0004] The purpose of this invention is to provide a backlight module with multiple heat dissipation components, which has the advantages of efficient heat dissipation and dust intrusion prevention, and solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a backlight module with multiple heat dissipation components, including a base frame, a heat dissipation component for achieving point-to-point heat dissipation, an opening and closing component for controlling the amount of ventilation, and a filter component for preventing dust intrusion. A light guide plate and a diaphragm assembly are embedded inside the base frame. An LED light strip is embedded inside the top of the base frame. A heat-conducting strip is attached to one side of the LED light strip. A flow guide groove is formed inside the base frame, and the longitudinal profile of the flow guide groove gradually narrows from bottom to top. The heat dissipation assembly includes an air duct disposed in the guide groove, a control mechanism serving as a power source, and a voltage sampling module disposed on the surface of the LED light strip. The air duct is configured as an S-shape with multiple bends and the air duct is consistent with the longitudinal contour of the guide groove. An ion heat sink is disposed at the top of the air duct and an ion heat sink is disposed at the bottom of the air duct. Both the ion heat sink and the ion heat sink are connected to the voltage sampling module for signal connection.

[0006] Preferably, the control mechanism includes an active shaft disposed on both sides of the air duct. A gear ring is fixedly connected to the outer contour of one side of the active shaft, and a fixing ring is fixedly connected to the outer contour of the other side of the active shaft. Multiple sets of paddles are rotatably connected to the outer contour of the fixing ring by a pin. A torsion spring is provided at the connection between the multiple sets of paddles and the fixing ring. The control mechanism also includes an active ring sleeved on the outside of the fixed ring, a toothed ring is fixedly connected to the outer contour of the active ring, and multiple sets of ratchet teeth are fixedly connected to the inner wall of the active ring.

[0007] Preferably, both the drive shaft and the drive ring are driven by built-in motors and are connected to the voltage sampling module signal, and the ratchet and the lever are engaged in a one-way engagement.

[0008] Preferably, the opening and closing assembly includes a blade plate disposed on the inner side of the top of the base frame. The two ends of the blade plate are fixedly connected to a rotating shaft. A fixing ring II is fixedly connected to the outer contour of the middle section of the rotating shaft. Multiple sets of paddles II are rotatably connected to the outer contour of the fixing ring II via pins. A torsion spring II is provided at the connection between the multiple sets of paddles II and the fixing ring II. A rotating ring is fixedly connected to the end of the rotating shaft away from the blade plate. A column spring sleeved on the outside of the rotating shaft is fixedly connected to the side of the rotating ring facing the blade plate. The end of the column spring away from the rotating ring is fixedly connected to the inner wall of the base frame.

[0009] Preferably, the opening and closing assembly further includes a driven ring sleeved on the outer contour of the rotating shaft, a toothed ring three is fixedly connected to the outer contour of the driven ring, and multiple sets of ratchet teeth two are fixedly connected to the inner wall of the driven ring.

[0010] Preferably, the third gear ring and the second gear ring are connected by chain drive, the second ratchet tooth and the second paddle are engaged unidirectionally, and the second ratchet tooth and the second paddle are oriented in the same direction as the first ratchet tooth and the first paddle.

[0011] Preferably, the filter assembly includes a fixed seat disposed on the inner side of the bottom of the base frame, a reciprocating screw is rotatably connected inside the fixed seat, a threaded ring is screwed onto the outer contour of the reciprocating screw, a base is fixedly connected to the side of the threaded ring facing the bottom of the base frame, a plurality of scraper strips are fixedly connected to the side of the base away from the threaded ring, and an unfolding plate is fixedly connected to the side of the fixed seat facing the bottom of the base frame, and a filter screen is disposed on the surface of the unfolding plate.

[0012] Preferably, the reciprocating lead screw and the toothed ring are connected by chain drive, the filter screen has a multi-layer stacked structure with the filter pore size decreasing from the outside to the inside, and the scraper is made of flexible material and makes frictional contact with the inner wall of the filter screen.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention, by setting up a heat dissipation component, achieves real-time sensing of the heating status of LED light strips and dynamic adjustment of differentiated heat dissipation intensity. It can adaptively match different levels of airflow velocity and heat exchange efficiency according to the actual temperature rise of the light strip. At the same time, by guiding the airflow to flow directionally from bottom to top along a preset path, it fully conforms to the physical law of the natural rise of hot air, and utilizes the increasing velocity effect of the airflow along the flow path to significantly improve heat exchange efficiency and heat dissipation uniformity, thereby ensuring that the LED light strip and optical components always operate within a suitable temperature range.

[0014] 2. By setting up an opening and closing component, this invention achieves precise linkage control between the opening of the top ventilation port of the module and the heat dissipation intensity. It can automatically adjust the ventilation volume according to the temperature rise of the light strip, so that the intake and exhaust air reach a dynamic balance. This ensures the smooth exhaust of hot air under heavy load conditions, and maintains the airtightness of the module under light load or standby conditions, effectively blocking the channel for external dust to enter from the top. Thus, while ensuring heat dissipation performance, it greatly improves the long-term cleanliness and environmental adaptability of the module.

[0015] 3. By setting up a filter component, this invention achieves passive purification of the incoming airflow and active self-cleaning of the filter surface. It can intercept dust particles of different sizes in stages when the outside air enters the module, effectively preventing the optical components from being contaminated. At the same time, the accumulated dust on the filter is removed in a timely manner by periodically scraping and micro-vibration, which prevents the filter from becoming clogged and ineffective due to long-term use. In addition, the airflow channel can be cut off by the linkage opening and closing component during the cleaning process, which effectively prevents dust from entering the module again with the airflow. Thus, while ensuring long-term stable ventilation and heat dissipation, the dustproof reliability and maintenance-free cycle of the module are significantly improved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a cross-sectional view of the main structure of the present invention; Figure 3 This is a schematic diagram of the frame structure of the present invention; Figure 4 This is a schematic diagram of the heat dissipation component of the present invention; Figure 5 This is a schematic diagram of the control mechanism of the present invention; Figure 6 This is a diagram showing the connection relationship of the opening and closing components of the present invention; Figure 7 This is a schematic diagram of the opening and closing component of the present invention; Figure 8 This is a connection diagram of the filter components of the present invention; Figure 9 This is a schematic diagram of the filtering component of the present invention.

[0017] In the diagram: 1. Base frame; 11. Light guide plate; 12. Diaphragm assembly; 13. LED light strip; 14. Temperature guide strip; 15. Air guide groove; 2. Air duct; 21. Ion heat sink one; 22. Ion heat sink two; 3. Drive shaft; 31. Gear ring one; 32. Fixing ring one; 33. Paddle one; 34. Torsion spring one; 4. Drive ring; 41. Gear ring two; 42. Ratchet one; 5. Blade; 51. Rotating shaft; 52. Fixing ring two; 53. Paddle two; 54. Torsion spring two; 55. Rotating ring; 56. Column spring; 6. Driven ring; 61. Gear ring three; 62. Ratchet two; 7. Fixing seat; 71. Reciprocating lead screw; 72. Threaded ring; 73. Base; 74. Scraper; 75. Unfolding plate; 76. Filter screen. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: Please see Figures 1 to 9 The present invention provides a technical solution: a backlight module with multiple heat dissipation components, including a base frame 1, and further including a heat dissipation component for achieving a fixed-point heat dissipation effect, an opening and closing component for controlling the amount of ventilation, and a filter component for preventing dust intrusion. A light guide plate 11 and a diaphragm group 12 are embedded inside the base frame 1. An LED light strip 13 is embedded inside the top of the base frame 1. A heat guide strip 14 is attached to one side of the LED light strip 13. A flow guide groove 15 is opened inside the base frame 1. The longitudinal profile of the flow guide groove 15 gradually narrows from bottom to top. The heat dissipation assembly includes an air duct 2 disposed in the guide groove 15, a control mechanism serving as a power source, and a voltage sampling module disposed on the surface of the LED light strip 13. The air duct 2 is configured as an S-shape with multiple bends and the air duct 2 is consistent with the longitudinal contour of the guide groove 15. An ion heat sink 21 is disposed at the top of the air duct 2, and an ion heat sink 22 is disposed at the bottom of the air duct 2. Both the ion heat sink 21 and the ion heat sink 22 are connected to the voltage sampling module for signal connection.

[0020] In this scheme, the base frame 1 is kept vertically suspended after installation. At this time, the LED light strip 13 is located inside and above the base frame 1. The forward voltage drop of the LED light strip 13 is monitored in real time by the voltage sampling module and compared with the preset safety reference voltage. The difference between the two reflects the current temperature rise of the LED light strip 13. Then, according to the temperature rise of the LED light strip 13, the working intensity of the heat dissipation component is controlled accordingly. Since the LED light strip 13 is set on the top inner side of the base frame 1, its heating process will transfer heat to the air at the top of the guide groove 15 through the heat conduction strip 14. At this time, the ion heat sink 21 and ion heat sink 22 generate an airflow from bottom to top, drawing the outside air from the bottom of the base frame 1 and expelling the hot air from the top of the base frame 1, completing the heat exchange to achieve the heat dissipation function.

[0021] Specifically, when the temperature rise of the LED strip 13 is low, the heat dissipation requirement of the LED strip 13 is low. At this time, only the ion heat sink 21 is activated to generate an upward airflow, the air velocity in the air duct 2 is low, and the heat exchange efficiency is low. However, when the temperature rise of the LED strip 13 is high, the heat dissipation requirement of the LED strip 13 is high. At this time, both the ion heat sink 21 and the ion heat sink 22 are activated to generate airflow, the air velocity in the air duct 2 is high, and the heat exchange efficiency is high.

[0022] It should be noted that the S-shaped design of the multiple bends in the air duct 2 forces the airflow to flow in an S-shaped path within the air duct 2, thereby increasing the contact area between the airflow and the light guide plate 11 to improve the heat dissipation efficiency of the solution. Furthermore, the outlines of the air duct 2 and the guide groove 15 are consistent, both gradually narrowing from bottom to top. That is, the cross-sectional area of ​​the air inlet at the bottom of the air duct 2 is larger than the cross-sectional area of ​​the air outlet at the top, thereby ensuring that the airflow velocity increases as it flows upward, and thus reaches the maximum scouring speed at the position of the heat guide strip 14 to improve the heat dissipation efficiency of the solution.

[0023] Furthermore, while the heat dissipation component is activated, the voltage sampling module, based on the current temperature rise of the LED light strip 13, synchronously controls the opening and closing component to adjust the opening degree of the top of the base frame 1 to match the current heat dissipation intensity. The higher the heat dissipation intensity, the faster the airflow in the air duct 2, corresponding to a higher opening degree at the top of the base frame 1. At this time, the ventilation volume of the solution is higher and the heat dissipation efficiency is higher. When the device is not working, the opening and closing component remains fully closed to prevent dust from entering the device from the top.

[0024] It should be noted that, since the air inlet side of the design is located at the bottom of the base frame 1 and the air outlet side is located at the top of the base frame 1, when the device is working, the hot air is discharged from the top of the base frame 1, which can effectively prevent external dust from entering from the top. In addition, the probability of dust adhering to the bottom air inlet side is greatly reduced, which effectively ensures the overall cleanliness of the device. Furthermore, the filter component adopts passive filtration, and the outside air is automatically filtered when it enters the air duct 2 from the bottom of the base frame 1, which can also prevent dust from entering the device with the airflow.

[0025] On the other hand, the filter component starts synchronously with the heat dissipation component, scraping off the dust attached to its surface by reciprocating horizontal movement, and further cooperating with the micro-vibration generated during the horizontal movement to shake off the intercepted dust, thus achieving the self-cleaning effect of the filter component; when the device is not used for a long time, the filter component may have serious dust accumulation due to long-term exposure to the environment. At this time, the filter component is linked to the opening and closing component to return to the closed state, thereby preventing the dust generated by the horizontal vibration of the filter component from entering the device.

[0026] Example 2: Please see Figure 3 , Figure 4 as well as Figure 5 This second embodiment further illustrates the control mechanism based on the first embodiment: the control mechanism includes an active shaft 3 disposed on both sides of the air duct 2, a gear ring 31 fixedly connected to the outer contour of one side of the active shaft 3, a fixing ring 32 fixedly connected to the outer contour of the other side of the active shaft 3, and multiple sets of paddles 33 rotatably connected to the outer contour of the fixing ring 32 via pins, and torsion springs 34 are provided at the connection points between the multiple sets of paddles 33 and the fixing ring 32; The control mechanism also includes an active ring 4 sleeved on the outside of the fixed ring 32. A toothed ring 41 is fixedly connected to the outer contour of the active ring 4, and multiple sets of ratchet teeth 42 are fixedly connected to the inner wall of the active ring 4.

[0027] Both the drive shaft 3 and the drive ring 4 are driven by built-in motors and are connected to the voltage sampling module signal. The ratchet 42 and the paddle 33 are engaged in a one-way manner.

[0028] As can be seen from Example 1, when the device is working, the voltage sampling module synchronously controls the rotation of the drive shaft 3 and the drive ring 4. The drive shaft 3 continues to rotate, while the drive ring 4 stops after rotating a certain angle. Figure 5 For example, when the drive shaft 3 rotates counterclockwise, it drives the gear ring 31, the fixed ring 32, and the paddle 33 to rotate synchronously. The gear ring 31 drives the filter assembly to start synchronously. When the drive shaft 3 and the drive ring 4 rotate counterclockwise synchronously, the paddle 33 does not contact the ratchet 42. When the drive ring 4 stops rotating, the paddle 33 will continue to contact the inclined surface of the ratchet 42 as the drive shaft 3 continues to rotate. Under the pressure of the inclined surface of the ratchet 42, the torsion spring 34 is twisted and rebounds. At this time, the rotation of the paddle 33 will not be transmitted to the ratchet 42, and the ratchet 42 remains stationary along with the drive ring 4.

[0029] If the drive shaft 3 rotates clockwise, the first pawl 33 rotates synchronously. At this time, the first pawl 33 contacts the end face of the first ratchet 42, which in turn drives the first ratchet 42, the drive ring 4, and the second gear ring 41 to rotate clockwise synchronously. The second gear ring 41 further drives the opening and closing assembly. That is, the drive shaft 3 and the drive ring 4 have a unidirectional transmission characteristic. The drive shaft 3 will only transmit its motion to the drive ring 4 when it rotates clockwise, while the counterclockwise rotation of the drive shaft 3 will not cause motion interference to the drive ring 4.

[0030] Example 3: Please see Figure 6 and Figure 7 This embodiment three further illustrates the following based on embodiment two: The opening and closing assembly includes a blade plate 5 disposed on the inner side of the top of the base frame 1. The two ends of the blade plate 5 are fixedly connected to a rotating shaft 51. A fixing ring 52 is fixedly connected to the outer contour of the middle section of the rotating shaft 51. Multiple sets of paddles 53 are rotatably connected to the outer contour of the fixing ring 52 via pins. A torsion spring 54 is provided at the connection between the multiple sets of paddles 53 and the fixing ring 52. A rotating ring 55 is fixedly connected to the end of the rotating shaft 51 away from the blade plate 5. A column spring 56 sleeved on the outside of the rotating shaft 51 is fixedly connected to the side of the rotating ring 55 facing the blade plate 5. The end of the column spring 56 away from the rotating ring 55 is fixedly connected to the inner wall of the base frame 1.

[0031] The opening and closing assembly also includes a driven ring 6 sleeved on the outer contour of the rotating shaft 51. A toothed ring 61 is fixedly connected to the outer contour of the driven ring 6, and multiple sets of ratchet teeth 62 are fixedly connected to the inner wall of the driven ring 6.

[0032] The gear ring 3 61 and gear ring 2 41 are connected by chain drive. The ratchet 2 62 and the paddle 2 53 are unidirectionally engaged, and the ratchet 2 62 and the paddle 2 53 are oriented in the same direction as the ratchet 1 42 and the paddle 1 33.

[0033] As can be seen from Embodiments 1 and 2, when the ventilation volume needs to be adjusted, the voltage sampling module controls the active ring 4 to rotate counterclockwise by a certain angle. During this process, the active ring 4 and the active shaft 3 rotate counterclockwise synchronously. The gear ring 2 41 further drives the gear ring 3 61, the driven ring 6, and the ratchet 2 62 to rotate counterclockwise synchronously. Since the ratchet 2 62 and the paddle 2 53 are set in the same direction as the ratchet 1 42 and the paddle 1 33, the counterclockwise rotation of the ratchet 2 62 will cause its end face to contact the paddle 2 53 and drive the paddle 2 53, the fixed ring 2 52, and the rotating shaft 51 to rotate counterclockwise synchronously. At this time, the angle of the counterclockwise rotation of the rotating shaft 51 is the same as the rotation angle of the active ring 4.

[0034] Furthermore, the rotating shaft 51 drives the blade 5, the rotating ring 55, and the spring 56 to rotate synchronously. The rotation of the blade 5 releases the sealing effect on the inside of the top of the base frame 1. At this time, the inside of the top of the base frame 1 is open and the opening is related to the rotation angle of the blade 5. When the rotation angle of the blade 5 increases in the range of 0 to 90 degrees, the opening of the inside of the top of the base frame 1 increases synchronously, and the ventilation volume increases synchronously. During this process, since one side of the spring 56 rotates synchronously with the rotating ring 55, while the other side remains stationary with the base frame 1, the spring 56 is synchronously twisted. Its rebound tendency is offset by the holding pressure of the ratchet 62 against the lever 53, making it unable to rebound.

[0035] It should be noted that, similar to the unidirectional transmission characteristics of the drive shaft 3 and drive ring 4, there is also a unidirectional transmission characteristic between the rotating shaft 51 and the driven ring 6. The driven ring 6 will drive the rotating shaft 51 to rotate synchronously only when it rotates counterclockwise, and the clockwise rotation of the driven ring 6 will not be transmitted to the rotating shaft 51.

[0036] Example 4: Please see Figure 8 and Figure 9 This fourth embodiment further illustrates the following based on the third embodiment: The filter assembly includes a fixed seat 7 disposed on the inner side of the bottom of the base frame 1. A reciprocating screw 71 is rotatably connected inside the fixed seat 7. A threaded ring 72 is screwed onto the outer contour of the reciprocating screw 71. A base 73 is fixedly connected to the side of the threaded ring 72 facing the bottom of the base frame 1. Multiple sets of scraper strips 74 are fixedly connected to the side of the base 73 away from the threaded ring 72. An unfolding plate 75 is fixedly connected to the side of the fixed seat 7 facing the bottom of the base frame 1. A filter screen 76 is disposed on the surface of the unfolding plate 75.

[0037] The reciprocating lead screw 71 and the gear ring 31 are connected by chain drive. The filter screen 76 has a multi-layered stacked structure with the filter pore size decreasing from the outside to the inside. The scraper 74 is made of flexible material and makes frictional contact with the inner wall of the filter screen 76. As can be seen from Embodiments 1 and 2, when outside air enters from the bottom of the base frame 1, it is filtered by the multi-layered stacked filter screen 76. The progressively smaller filter pore size from the outside to the inside achieves a graded filtration effect. The outermost layer performs coarse filtration to intercept large dust particles, while the inner layer performs fine filtration to intercept fine dust. Furthermore, the intercepted dust naturally slides off under gravity due to the inclined filter screen 76, thereby effectively improving the dust intrusion resistance of the solution.

[0038] Under normal conditions, the drive shaft 3 drives the reciprocating screw 71 to rotate counterclockwise synchronously through the gear ring 31. At this time, the rotation of the reciprocating screw 71 further causes the threaded ring 72 to move back and forth along the axial direction of the reciprocating screw 71. The reciprocating screw 71 drives the base 73 and the scraper 74 to move synchronously. During the lateral movement of the scraper 74 inside the filter screen 76, it contacts the inner wall of the filter screen 76 to achieve a scraping and cleaning effect, so that the dust attached to the surface of the filter screen 76 is scraped off. During the lateral movement, due to the friction between the scraper 74 and the filter screen 76, the surface of the filter screen 76 will vibrate slightly, further shaking off the attached dust, thereby enhancing the filtration effect of the solution.

[0039] When the filter screen 76 is covered with dust, the micro-vibration generated by the lateral movement of the scraper 74 will cause dust to be stirred up, which will then enter the air duct 2 along with the airflow. At this time, the voltage sampling module controls the drive shaft 3 to rotate clockwise, and the gear ring 31 drives the reciprocating screw 71 to rotate clockwise in sync. The clockwise rotation of the reciprocating screw 71 also drives the threaded ring 72 to move back and forth laterally, but the direction of the lateral movement is opposite to the direction of the lateral movement of the threaded ring 72 when the reciprocating screw 71 rotates counterclockwise. At the same time, the drive shaft 3 drives the fixed ring 32 and the lever 33 to rotate clockwise in sync. At this time, the lever 33 further drives the ratchet 42, the drive ring 4 and the gear ring 41 to rotate clockwise in sync. The gear ring 41 then drives the gear ring 61, the driven ring 6 and the ratchet 62 to rotate clockwise in sync.

[0040] As can be seen from Example 3, the clockwise rotation of the driven ring 6 will not interfere with the rotating shaft 51. That is, at this time, the clockwise rotation of the second ratchet 62 tends to release the pressure on the second paddle 53. The pressure of the second ratchet 62 on the second paddle 53 decreases, causing the column spring 56 to start to rebound. The rebound of the column spring 56 causes the rotating ring 55, the rotating shaft 51, the blade 5, the second fixed ring 52, and the second paddle 53 to rotate clockwise synchronously until the blade 5 returns to its initial closed state, and the elastic potential energy of the rotating ring 55 disappears. Meanwhile, the second ratchet 62 continues to rotate clockwise along with the driving shaft 3. At this time, the continuous rotation of the second ratchet 62 causes its inclined surface to continuously contact and squeeze the second paddle 53, causing the second torsion spring 54 to be twisted and rebound. That is, the clockwise rotation of the driven ring 6 will not interfere with the rotating shaft 51, and the blade 5 always remains in the closed state.

[0041] At this time, the closing of the blade 5 cuts off the airflow, and the air remains in the air duct 2, keeping the guide groove 15 under positive pressure. At this time, the airflow cannot enter from the bottom of the base frame 1, thereby avoiding dust caused by micro-vibration during the transverse movement of the scraper 74, which would cause dust to enter the air duct 2 along with the airflow.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A backlight module with multiple heat dissipation components, comprising a base frame (1), characterized in that: It also includes a heat dissipation component to achieve a fixed-point heat dissipation effect, an opening and closing component to control the amount of airflow, and a filter component to prevent dust intrusion. The base frame (1) is embedded with a light guide plate (11) and a diaphragm group (12). The top of the base frame (1) is embedded with an LED light strip (13). A heat-conducting strip (14) is attached to one side of the LED light strip (13). A flow guide groove (15) is opened inside the base frame (1). The longitudinal profile of the flow guide groove (15) gradually narrows from bottom to top. The heat dissipation assembly includes an air duct (2) disposed in the guide groove (15), a control mechanism serving as a power source, and a voltage sampling module disposed on the surface of the LED light strip (13). The air duct (2) is configured as an S-shape with multiple bends and the air duct (2) is consistent with the longitudinal contour of the guide groove (15). An ion heat sink one (21) is disposed at the top of the air duct (2), and an ion heat sink two (22) is disposed at the bottom of the air duct (2). Both the ion heat sink one (21) and the ion heat sink two (22) are connected to the voltage sampling module for signal connection.

2. A backlight module with multiple heat dissipation components according to claim 1, characterized in that: The control mechanism includes an active shaft (3) disposed on both sides of the air duct (2). A gear ring (31) is fixedly connected to the outer contour of one side of the active shaft (3), and a fixing ring (32) is fixedly connected to the outer contour of the other side of the active shaft (3). Multiple sets of paddles (33) are rotatably connected to the outer contour of the fixing ring (32) by a pin. A torsion spring (34) is provided at the connection between the multiple sets of paddles (33) and the fixing ring (32). The control mechanism also includes an active ring (4) sleeved on the outside of the fixed ring (32). A toothed ring (41) is fixedly connected to the outer contour of the active ring (4), and multiple sets of ratchet teeth (42) are fixedly connected to the inner wall of the active ring (4).

3. A backlight module with multiple heat dissipation components according to claim 2, characterized in that: The drive shaft (3) and drive ring (4) are both driven by built-in motors and connected to the voltage sampling module signal. The ratchet (42) and the paddle (33) are unidirectionally engaged.

4. A backlight module with multiple heat dissipation components according to claim 1, characterized in that: The opening and closing assembly includes a blade plate (5) disposed on the inner side of the top of the base frame (1). The two ends of the blade plate (5) are fixedly connected to a rotating shaft (51). A fixing ring (52) is fixedly connected to the outer contour of the middle section of the rotating shaft (51). Multiple sets of paddles (53) are rotatably connected to the outer contour of the fixing ring (52) by a pin. A torsion spring (54) is provided at the connection between the multiple sets of paddles (53) and the fixing ring (52). A rotating ring (55) is fixedly connected to the end of the rotating shaft (51) away from the blade plate (5). A column spring (56) sleeved on the outside of the rotating shaft (51) is fixedly connected to the side of the rotating ring (55) facing the blade plate (5). The end of the column spring (56) away from the rotating ring (55) is fixedly connected to the inner wall of the base frame (1).

5. A backlight module with multiple heat dissipation components according to claim 4, characterized in that: The opening and closing assembly also includes a driven ring (6) sleeved on the outer contour of the rotating shaft (51), a toothed ring three (61) is fixedly connected to the outer contour of the driven ring (6), and multiple sets of ratchet teeth two (62) are fixedly connected to the inner wall of the driven ring (6).

6. A backlight module with multiple heat dissipation components according to claim 5, characterized in that: The third gear ring (61) and the second gear ring (41) are connected by chain drive. The second ratchet (62) and the second paddle (53) are engaged in one direction, and the second ratchet (62) and the second paddle (53) are aligned with the first ratchet (42) and the first paddle (33).

7. A backlight module with multiple heat dissipation components according to claim 1, characterized in that: The filter assembly includes a fixed seat (7) disposed on the inner side of the bottom of the base frame (1). A reciprocating screw (71) is rotatably connected inside the fixed seat (7). A threaded ring (72) is screwed onto the outer contour of the reciprocating screw (71). A base (73) is fixedly connected to the side of the threaded ring (72) facing the bottom of the base frame (1). Multiple sets of scraper strips (74) are fixedly connected to the side of the base (73) away from the threaded ring (72). An unfolding plate (75) is fixedly connected to the side of the fixed seat (7) facing the bottom of the base frame (1). A filter screen (76) is disposed on the surface of the unfolding plate (75).

8. A backlight module with multiple heat dissipation components according to claim 7, characterized in that: The reciprocating lead screw (71) and the gear ring (31) are connected by chain drive. The filter screen (76) has a multi-layer stacked structure and the filter hole size decreases from the outside to the inside. The scraper (74) is made of flexible material and the scraper (74) is in frictional contact with the inner wall of the filter screen (76).

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