Backlight module of liquid crystal display (LCD)

Abstract

The invention discloses a backlight module of a liquid crystal display (LCD). The backlight module comprises a frame, a backlight module body and an opening and closing heat dissipation plate arranged at a heat dissipation opening of the frame. A lamp holder and a mounting plate are arranged on the inner wall of the frame, lamp beads are inserted into the lamp holder, and a lamp groove is formed in the mounting plate. The backlight module further comprises an abutting mechanism and a quick opening mechanism, and when the backlight module body is heated to expand, the abutting mechanism drives the quick opening mechanism to enable the opening and closing heat dissipation plate to be quickly opened for heat dissipation. In addition, a closing mechanism is further arranged and used for enabling the opening and closing heat dissipation plate to close the heat dissipation opening again after heat dissipation is completed. The closing mechanism is connected with the first transmission belt through the first range extending mechanism and the transmission mechanism, the racks are pushed through a pushing block on the first range extending mechanism, and closing is achieved by increasing the approaching stroke between the racks. The automatic heat dissipation and closing functions are achieved, and the heat dissipation efficiency and stability of the liquid crystal display are improved.

Description

Technical Field

[0001] The invention relates to the technical field of liquid crystal displays, in particular to a backlight module of an LCD liquid crystal display. Background Art

[0002] The backlight module of a liquid crystal display is a complex and critical component. It is mainly composed of a light source (such as an LED light bar), a light guide plate, a reflective module, an optical film (usually including a diffuser, a light-enhancing film, a prism, etc.) and a series of fixing and supporting structures. The main function of the backlight module is to provide sufficient and evenly distributed light for the liquid crystal display to ensure that the images and text on the LCD panel can be displayed clearly and brightly. When the light emitted by the LED light source passes through the light guide plate, the light will be evenly guided to the entire screen, while the reflective module is responsible for reflecting the light that is not absorbed by the light guide plate back to the light guide plate to improve the utilization rate of the light. The optical film further adjusts the distribution and angle of the light to ensure that the light can be irradiated onto the LCD panel in the best way, thereby presenting the best display effect. The design of the entire backlight module requires precise calculation and optimization to ensure that a stable and high-quality display effect can be provided under various environmental conditions.

[0003] At present, in order to prevent light leakage, in most cases, the frame on which the backlight module body is installed will be set as a closed structure, and the heat dissipation may be completed by only a few small heat dissipation holes. However, due to the long-term startup of the lamp beads, especially the high-intensity operation of the LCD display panel, the lamp beads will generate more heat, and it is difficult to meet the heat dissipation needs with only a few small holes. Moreover, when the small holes are in the normally open state, it is easy for dust to enter.

[0004] For this reason, we propose a backlight module for an LCD liquid crystal display. Summary of the invention

[0005] The purpose of the present invention is to provide a backlight module for an LCD liquid crystal display to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solution: comprising a frame and a backlight module body arranged in the frame, wherein a lamp holder and a mounting plate which conflict with each other are arranged on the inner wall surface of the frame, wherein a lamp slot is opened on the mounting plate, and lamp beads which are plugged into the lamp slot are arranged on the lamp holder, and the mounting plate is fixedly arranged on the bottom surface of the backlight module, and the backlight module of the LCD liquid crystal display further comprises:

[0007] An opening and closing heat dissipation plate is arranged at the heat dissipation port of the frame and is slidably connected to the inner wall of the frame. A resistance mechanism and a quick opening mechanism are arranged between the opening and closing heat dissipation plate and the mounting plate. When the backlight module body expands due to heat and begins to press the resistance mechanism downward through the mounting plate, the resistance mechanism drives the quick opening mechanism to quickly open the opening and closing heat dissipation plate.

[0008] As a further description of the above technical solution: the said resistance mechanism comprises a resistance plate 1 and a resistance plate 2 connected by a spring 2, wherein the resistance plate 1 is slidably arranged on the resistance plate 2, and the resistance plate 2 is fixed on the bottom surface of the said mounting plate;

[0009] The quick opening mechanism includes a transmission belt installed on the inner wall surface of the frame and a connecting block fixed on the surface of the opening and closing heat dissipation plate, the connecting block is connected to the frame surface through a spring, and a gear set that meshes with each other is also provided on the inner wall surface of the frame, the belt surface of the transmission belt is provided with a meshing tooth that meshes with one of the gears in the gear set, the end of the abutment plate is connected to the belt surface on the other side of the transmission belt away from the meshing tooth, a rotating rod is fixed on the axial surface of another gear in the gear set, and the rotating rod is inclined and its end abuts against the end of the connecting block.

[0010] As a further description of the above technical solution: the backlight module of the LCD liquid crystal display further comprises a closing mechanism, which is used to restore the opening and closing heat dissipation plate and re-close the heat dissipation opening of the frame after the heat dissipation is completed and the backlight module body is restored from thermal expansion;

[0011] The closing mechanism includes a limiting slide rail, rack 1 and rack 2 which are arranged on the inner wall surface of the frame from top to bottom in sequence, wherein two sliders are slidably arranged in the limiting slide rail and two steering wheels are rotatably arranged, and a pulling belt 1 is fixedly arranged on the two sliders, and the two pulling belts 1 are fixed to the bottom surface of the connecting frame through the ends behind the two steering wheels, the connecting frame is slidably arranged on the inner wall surface of the frame and is fixedly connected to the connecting block, and a gear 1 is rotatably arranged between the rack 1 and the rack 2 in the frame, and the rack 1 and the rack 2 are both slidably arranged on the surface of the frame, and the gear 1 is meshed with the rack 1 and the rack 2 at the same time, and the two sliders are respectively connected to the rack 1 and the rack 2 through connecting rods.

[0012] As a further description of the above technical solution: the backlight module of the LCD liquid crystal display also includes an extended-range mechanism 1 arranged on the frame, and the extended-range mechanism 1 is connected to the transmission belt 1 through a transmission mechanism, and the closing mechanism also includes a pushing block arranged on the extended-range mechanism 1 and on the extension line of the rack 1. After the heat dissipation is completed and the backlight module body is restored by thermal expansion, the extended-range mechanism 1 is driven by the transmission mechanism to amplify the rotation stroke of the transmission belt 1, and the pushing block is driven by the extended-range mechanism 1 to push the rack 1, thereby increasing the stroke of the rack 1 and the rack 2 approaching each other.

[0013] As a further description of the above technical solution: the abutment mechanism further comprises a pressure rod, an elastic plate 1 and an elastic plate 2, wherein the pressure rod is fixed on the surface of the frame, the elastic plate 1 and the elastic plate 2 are respectively rotatably arranged on the surfaces of the abutment plate 1 and the abutment plate 2 close to each other through a torsion spring, and the pressure rod abuts against the surface of the elastic plate 2;

[0014] The backlight module of the LCD liquid crystal display also includes a second range-extending mechanism arranged on the frame and connected to the first resistance plate. A top block is fixedly arranged on the connecting frame. When the opening and closing heat dissipation plate is quickly opened upward, the top block abuts against the second range-extending mechanism, and the first resistance plate pushes the transmission belt to rotate again through the second range-extending mechanism.

[0015] As a further description of the above technical solution: the second range-extending mechanism includes a movable block and a movable pulley slidably arranged on the inner wall surface of the frame, and a fixed block fixed on the frame, through the movable pulley, a pulling belt 2 is arranged between the movable block and the fixed block, and the pulling belt 2 is V-shaped as a whole. The movable block is connected to the surface of the frame through a spring 3. The second range-extending mechanism also includes a transmission belt 3 arranged on the frame, and a driving block is arranged between the belt surface on one side of the transmission belt 3 and the movable pulley, and the belt surface on the side of the transmission belt 3 away from the driving block is connected to a contact plate 1.

[0016] As a further description of the above technical solution: the transmission mechanism includes shaft one and shaft two rotatably arranged on the inner wall surface of the frame, a transmission belt two is installed between the shaft one and the rotating shaft of the transmission belt one through a synchronous wheel, a ratchet groove is opened on the inner wall surface of the shaft one, a clamping plate abutting against the upper end surface of the ratchet groove is installed on the shaft two through an elastic member, and the shaft two is connected to the range extender mechanism one through a reciprocating motion part.

[0017] As a further description of the above technical solution: the reciprocating motion part includes a center wheel fixedly set on the axial surface of shaft two, and meshing teeth two are provided on the inner wall surface of the center wheel and shaft two, and the teeth of the meshing teeth two on the center wheel and the inner wall surface of shaft two are oriented in opposite directions, and a gear three is provided between the center wheel and the inner wall of shaft two, with one side end rotatably arranged with the inner wall surface of the frame, and when shaft two rotates, gear three alternately meshes with the inner wall surface of shaft two and the meshing teeth two on the center wheel.

[0018] As a further description of the above technical solution: the range-extending mechanism 1 includes a connecting rod 2 and a connecting rod 3 which are rotatably arranged relative to each other, wherein the end of the connecting rod 2 is fixedly connected to the surface of the gear 3, and the end of the connecting rod 3 is rotatably provided with a limit block which is slidably connected to the bottom surface of the frame, and the push block is fixed on the end surface of the limit block on the extension line of the rack 1.

[0019] In the above technical solution, the backlight module of an LCD liquid crystal display provided by the present invention has the following beneficial effects:

[0020] 1. Through the quick opening mechanism and the resistance mechanism, in the initial stage of the backlight module body's thermal expansion, the opening and closing heat dissipation plate can be driven to open quickly in time, so that the internal hot air flow can be discharged in time, and the inclined rotating rod increases the sensitivity. When the backlight module body undergoes a slight change, the rotating rod can be separated from the connecting block by a slight deflection, thereby preventing the backlight module body from undergoing greater expansion deformation or damage due to overheating, and effectively protecting the safety and stability of the backlight module.

[0021] 2. After the heat dissipation is completed, the automatic closing of the opening and closing heat dissipation plate is realized through the cooperation of the closing mechanism and the range-extending mechanism 1 and the range-extending mechanism 2. When the deformation of the backlight module body itself in the thermal expansion and recovery to the initial state is small, the quick opening mechanism, the range-extending mechanism 1 and the range-extending mechanism 2 set by the customs, when the backlight module itself cannot produce a large deformation, amplify the stroke of the resistance mechanism, thereby realizing the closing of the opening and closing heat dissipation plate after opening. It has automatic opening and closing functions and has better practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0024] Figure 2A schematic diagram of the structure of a backlight module provided by an embodiment of the present invention

[0025] Figure 3 A schematic diagram of a structure at a local angle provided by an embodiment of the present invention;

[0026] Figure 4 A schematic structural diagram of a front view of a backlight module provided by an embodiment of the present invention;

[0027] Figure 5 A structural schematic diagram of a front view of a closing mechanism provided by an embodiment of the present invention;

[0028] Figure 6 A schematic diagram of the structure of shaft one and gear three at an angle provided in an embodiment of the present invention;

[0029] Figure 7 A structural schematic diagram of a front view of a closing mechanism provided by an embodiment of the present invention;

[0030] Figure 8 A schematic diagram of a partial structure of a closing mechanism provided by an embodiment of the present invention;

[0031] Fig. 9 A schematic diagram of the structure of the first and second abutment plates provided in an embodiment of the present invention;

[0032] Fig.10 A schematic diagram of the structure of the front view of the first and second abutment plates provided in an embodiment of the present invention;

[0033] Fig.11 The embodiment of the present invention provides Figure 7 The enlarged structural diagram at A in the middle;

[0034] Fig.12 A schematic structural diagram of shaft one and gear three at another angle provided in an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1. Frame; 2. Opening and closing heat sink; 3. Transmission belt 1; 31. Spring 1; 32. Connecting block; 33. Gear 1; 34. Gear set; 35. Rotating rod; 4. Backlight module; 41. Prism sheet; 42. Diffusion film; 43. Light guide plate; 5. Pulling belt 1; 51. Limiting slide rail; 52. Sliding block; 53. Rack 1; 54. Steering wheel; 55. Rack 2; 56. Connecting rod; 57. Gear 1; 58. Pushing block; 6. Mounting plate; 71. Connecting rod 2; 72. Connecting rod 3; 75. Limiting block; 8. Lamp trough; 9. Transmission Belt 2; 91, shaft 1; 92, ratchet groove; 93, card plate; 94, gear 2; 95, center wheel; 96, gear 3; 97, shaft 2; 10, lamp bead; 11, lamp holder; 12, resistance plate 1; 121, resistance plate 2; 122, spring 2; 123, pressure rod; 124, elastic plate 1; 125, elastic plate 2; 13, top block; 131, driving block; 132, transmission belt 3; 133, fixed block; 134, spring 3; 135, movable block; 136, pulling belt 2; 137, movable pulley; 14, connecting frame. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0038] See also Figure 1 - Fig.12The embodiment of the present invention provides a technical solution of a backlight module of an LCD liquid crystal display: comprising a frame 1 and a backlight module 4 arranged in the frame 1, wherein a lamp holder 11 and a mounting plate 6 which conflict with each other are arranged on the inner wall surface of the frame 1, wherein a lamp groove 8 is opened on the mounting plate 6, and a lamp bead 10 which is plugged into the lamp groove 8 is arranged on the lamp holder 11, and the mounting plate 6 is fixedly arranged on the bottom surface of the backlight module 4, and a closed cover is also arranged outside the frame 1, and a reflective paper is arranged on the closed cover relative to the surface of the backlight module 4, and when the closed cover and the frame 1 are closed, the space formed by the closed cover and the inside of the frame 1 is a closed structure, and the lamp bead 1 0 is turned on, its light is reflected by the reflective paper and irradiated on the backlight module 4, and then passes through a series of scattering and diffusion of the backlight module 4, so that the light source evenly illuminates the LCD liquid crystal display panel. In order to improve the irradiation effect of the lamp beads 10 on the backlight module 4, reflective paper is also provided on the inner wall surface of the lamp groove 8. The backlight module 4 includes a light guide plate 43) and an optical film group that are bonded to each other. The optical film group includes a diffusion film 42 arranged above the light guide plate 43, and a prism film 41 is also arranged above the diffusion film 42. The light guide plate 43 is a key component in the backlight module, and it is responsible for evenly distributing the light emitted by the light source to the entire display area. In addition, the optical film group is composed of multiple films: first, the diffusion film 42 is arranged above the light guide plate 43, and its main function is to make the light more evenly scattered to avoid obvious bright spots or dark areas; then the prism film 41 is arranged above the diffusion film 42, which uses the principle of light refraction to further guide the light and improve the brightness of the front of the screen; finally, the reflective sheet is arranged below the light guide plate 43, and its function is to reflect the light leaking from the bottom of the light guide plate 43 back to the inside of the light guide plate 43 to improve the utilization rate of light and the overall brightness. These components work together to ensure that the backlight module can provide stable and uniform light for the liquid crystal display.

[0039] The backlight module of the LCD display also includes:

[0040] An opening and closing heat sink 2 is arranged at the heat dissipation port of the frame 1 and is slidably connected to the inner wall of the frame 1. A resistance mechanism and a quick opening mechanism are arranged between the opening and closing heat sink 2 and the mounting plate 6. When the backlight module 4 expands due to heat and begins to press the resistance mechanism downward through the mounting plate 6, the resistance mechanism drives the quick opening mechanism to quickly open the opening and closing heat sink 2. In order to prevent light leakage, in most cases, the frame 1 on which the backlight module 4 is installed will be set as a closed structure, and the heat dissipation method may be completed by only a few small heat dissipation holes. However, due to the long-term startup of the lamp beads 10, especially when the liquid crystal display panel is working at high intensity, the lamp beads 10 will generate more heat, and it is difficult to meet the heat dissipation requirements with only a few small holes. By means of the quick opening mechanism and the resistance mechanism, when the backlight module 4 is heated and begins to expand, the backlight module 4 will slightly push the mounting plate 6 and the lamp holder 11 downward. When the mounting plate 6 presses the resistance mechanism, the resistance mechanism drives the quick opening mechanism to directly open the opening and closing heat sink 2 completely, and the heat dissipation port on the frame 1 is fully opened. In this way, the internal hot air flow will flow to the relatively lower temperature area outside through the opened heat dissipation port, thereby dissipating heat. When the LCD screen is not in use and the lamp bead 10 is not working, the opening and closing heat dissipation plate 2 is in a closed state, thereby preventing the problem of a large amount of dust entering the frame 1 when dissipating heat through small holes or directly through the heat dissipation port. In the initial stage when the internal overheating begins to cause gas expansion or the backlight module 4 expands due to heat, the opening and closing heat dissipation plate 2 will be quickly opened directly through the resistance mechanism and the quick opening mechanism for heat dissipation. The opening of the opening and closing heat dissipation plate 2 is relatively timely, and the backlight module 4 will not produce greater expansion deformation, thereby preventing damage to the backlight module 4 after overheating.

[0041] The resistance mechanism includes a resistance plate 12 and a resistance plate 121 connected by a spring 122, wherein the resistance plate 12 is slidably arranged on the resistance plate 121, and the resistance plate 121 is fixed on the bottom surface of the mounting plate 6; when the backlight module 4 is in the initial stage of thermal expansion, the backlight module 4 presses the mounting plate 6 downward, thereby pressing the resistance plate 121 downward through the mounting plate 6, so that the resistance plate 12 moves downward, thereby causing the resistance plate 12 to also move downward.

[0042] The quick opening mechanism includes a transmission belt 3 installed on the inner wall surface of the frame 1 and a connecting block 32 fixed on the surface of the opening and closing heat dissipation plate 2. The connecting block 32 is connected to the surface of the frame 1 through a spring 31. A gear set 34 that meshes with each other is also provided on the inner wall surface of the frame 1. The belt surface of the transmission belt 3 is provided with a meshing tooth 33 that meshes with one of the gears in the gear set 34. The end of the contact plate 12 is connected to the belt surface of the transmission belt 3 on the other side away from the meshing tooth 33. When the contact plate 12 moves downward, the belt of one side of the transmission belt 3 is pushed to move downward, so that the belt with the meshing tooth 33 on the other side of the transmission belt 3 moves upward, so that the gear set 34 rotates through the meshing structure between the meshing tooth 33 and one of the gears in the gear set 34. A rotating rod 35 is fixed on the axial surface of another gear in the gear set 34, and the rotating rod 35 is inclined and its end is in contact with the end of the connecting block 32. It should be noted that the function of the gear set 34 is to change the transmission direction. When the contact plate 12 moves downward, the transmission belt 3 rotates clockwise, and the gear set 34 is set to make the rotating rod 35 also rotate clockwise. When the rotating rod 35 rotates clockwise, due to its initial tilted setting, the end of the rotating rod 35 rests on the end of the connecting block 32. In this way, the rotating rod 35 only needs to rotate slightly to disengage from the connecting block 32. When the opening and closing heat dissipation plate 2 is in a closed state, the spring 1 31 is in a tensile deformation state. After the rotating rod 35 is disengaged from the connecting block 32, the connecting block 32 is no longer limited, and the spring 1 31 recovers its deformation and pulls the connecting block 32 upward, thereby directly sliding the opening and closing heat dissipation plate 2 upward to quickly open the heat dissipation port on the frame 1 to achieve heat dissipation of the internal space of the frame 1. There is no need for the backlight module 4 to produce more expansion deformation, but in the initial state of thermal expansion, the opening and closing heat dissipation plate 2 can be directly opened to dissipate heat in time to prevent overheating and cause greater damage to the backlight module 4.

[0043] The backlight module 4 of the LCD liquid crystal display further includes a closing mechanism, which is used to restore the open and close heat dissipation plate 2 and re-close the heat dissipation opening of the frame 1 after the heat dissipation is completed and the backlight module 4 recovers from thermal expansion;

[0044] The closing mechanism includes a limiting slide rail 51, a rack 1 53 and a rack 2 55 which are sequentially arranged on the inner wall surface of the frame 1 from top to bottom, wherein two sliders 52 are slidably arranged in the limiting slide rail 51 and two steering wheels 54 are rotatably arranged, and a pulling belt 1 5 is fixedly arranged on the two sliders 52, and the ends of the two pulling belts 1 5 after passing through the two steering wheels 54 are fixed to the bottom surface of the connecting frame 14, and the connecting frame 14 is slidably arranged on the inner wall surface of the frame 1 and is fixedly connected to the connecting block 32, and the pulling belt 1 5 is L-shaped as a whole. After the backlight module 4 is heated and expanded, the connecting block 3 2 and the opening and closing heat dissipation plate 2 are opened upward together, the connecting frame 14 also moves upward together, thereby pulling the two sliders 52 respectively through the two pulling belts 1 5, so that the two sliders 52 move away from each other in the limiting slide rail 51 until the opening and closing heat dissipation plate 2 is fully opened, and the frame 1 is rotatably provided with a gear 1 57 between the rack 1 53 and the rack 2 55, and the rack 1 53 and the rack 2 55 are both slidably provided on the surface of the frame 1, and the gear 1 57 is meshed with the rack 1 53 and the rack 2 55 at the same time, and the two sliders 52 are respectively connected with the rack 1 53 and the rack 2 55 through the connecting rod 56. When the two sliders 52 move away from each other in the limiting slide rail 51, the rack 1 53 and the rack 2 55 will also move away from each other. By pushing the rack 1 53, the rack 1 53 is moved in the direction close to the gear 1 57. At this time, the rack 1 53 and the rack 2 55 can be brought close to each other, so that the two sliders 52 are brought close to each other. At this time, the connecting frame 14 can be pulled downward by the two pulling belts 1 5, so that the connecting block 32 and the opening and closing heat dissipation plate 2 move downward. At this time, the opening and closing heat dissipation plate 2 has a tendency to close the heat dissipation port on the frame 1.

[0045] The backlight module 4 of the LCD liquid crystal display also includes an extended-range mechanism 1 arranged on the frame 1, and the extended-range mechanism 1 is connected to the transmission belt 1 3 through a transmission mechanism. The closing mechanism also includes a push block 58 arranged on the extended-range mechanism 1 and on the extension line of the rack 1 53. After the heat dissipation is completed and the backlight module 4 is restored by thermal expansion, the extended-range mechanism 1 is driven by the transmission mechanism to amplify the rotation stroke of the transmission belt 1 3, and the push block 58 is driven by the extended-range mechanism 1 to push the rack 1 53, thereby increasing the stroke of the rack 1 53 and the rack 2 55 approaching each other. After the heat dissipation is completed and the backlight module 4 recovers from the heat expansion, the backlight module 4 pulls the mounting plate 6 upwards, so that the resistance mechanism moves upwards. At this time, the conveyor belt 1 changes to counterclockwise movement. At this time, the pushing block 58 on the range-extending mechanism 1 pushes the rack 1 53 through the transmission mechanism, so that it moves toward the direction close to the gear 1 57, so that the two sliders 52 are close to each other through the rack 1 53 and the rack 2 55 that are close to each other, so that the two pulling belts 1 5 pull the connecting frame 14 and the connecting block 32 downwards to move the opening and closing heat dissipation plate 2 downwards, and start to close the heat dissipation port on the frame 1. Due to the opening of the opening and closing heat dissipation plate 2, the spring 1 31 quickly recovers its deformation and quickly opens upwards. Even if it expands due to heat, the backlight module 4 will not have a particularly large deformation, but will be It has a certain fluctuation, and excessive deformation will directly lead to damage to the backlight module 4, so the thermal expansion of the backlight module 4 only plays a role in unlocking the connecting block 32. In this way, when the opening and closing heat dissipation plate 2 is closed, the set range-extending mechanism 1 can amplify the movement of the pushing block 58 by the rotation of the transmission belt 3 through the transmission mechanism when the backlight module 4 recovers from the thermal expansion, so that when the backlight module 4 has only a certain deformation, the pushing block 58 can push the rack 53 to move a larger distance, so that the opening and closing heat dissipation plate 2 can close the heat dissipation port on the frame 1, and can amplify the smaller deformation of the backlight module 4 during the transmission process, so that the opening and closing heat dissipation plate 2 can close the heat dissipation port on the frame 1 after the frame 1 is quickly opened.

[0046] The resistance mechanism further includes a pressure rod 123, an elastic plate 124 and an elastic plate 2 125, wherein the pressure rod 123 is fixed on the surface of the frame 1, and the elastic plate 124 and the elastic plate 2 125 are respectively rotatably arranged on the surfaces of the resistance plate 1 12 and the resistance plate 2 121 close to each other through a torsion spring, and the pressure rod 123 resists against the surface of the elastic plate 2 125; when the resistance plate 2 121 is in the initial position, that is, when the backlight module 4 is not heated and expanded, the pressure rod 123 resists against the surface of the elastic plate 2 125, and the elastic plate 2 125 is in the initial position. The elastic plate 124 and the elastic plate 125 will be closer to the vertical angle, and when the contact plate 121 moves downward, the elastic plate 125 gradually moves away from the pressure rod 123, and the elastic plate 125 will gradually rotate outward to open, and when the contact plate 121 and the contact plate 12 are in the initial state, there is a certain gap between the ends of the elastic plate 124 and the elastic plate 125, and when the elastic plate 125 gradually separates from the pressure rod 123, the elastic plate 125 and the elastic plate 124 will overlap to a certain extent in the top view direction;

[0047] The backlight module 4 of the LCD liquid crystal display also includes an extended-range mechanism 2 arranged on the frame 1 and connected to the contact plate 12. A top block 13 is fixedly arranged on the connecting frame 14. When the opening and closing heat dissipation plate 2 is quickly opened upward, the top block 13 abuts against the extended-range mechanism 2, and the contact plate 12 pushes the transmission belt 13 to rotate again through the extended-range mechanism 2. When the backlight module 4 expands due to heat, the opening and closing heat sink 2 opens upward rapidly, and at this time, the top block 13 on the connecting frame 14 moves upward rapidly, and contacts with the range-extending mechanism 2 with a certain acceleration, thereby causing a relative displacement between the contact plate 1 12 and the contact plate 2 121 through the range-extending mechanism 2 (because the backlight module 4 has expanded to a certain limit due to heat at this time, and in this extremely short time span, even if the backlight module 4 is still expanding due to heat, its deformation amount will be very small), when the contact plate 12 moves downward, the elastic plate 1 124 thereon will also move downward, and at this time, the contact plate 2 121 has moved downward a certain distance, and the elastic plate 2 125 is in an outwardly expanded state, and the elastic plate 1 124 moves downward with the contact plate 12 until the elastic plate 1 124 contacts with the elastic plate 2 125, and the torsion springs on the elastic plate 1 124 and the elastic plate 2 125 are deformed, so that the elastic plate 1 124 passes over the elastic plate 2 125. After that, the torsion spring recovers its deformation, and the elastic plate 124 and the elastic plate 2 125 abut against each other, and the contact plate 12 and the contact plate 2 121 are fixed relatively again. At this time, the transmission belt rotates again for a distance under the downward movement of the contact plate 12. At this time, the spring 2 122 is in a tensile deformation state. When the thermal expansion of the backlight module 4 is restored, the contact plate 2 121 moves upward with the mounting plate 6. In this process, since the spring 2 122 is in a tensile deformation state, As the second contact plate 121 moves upward, the first contact plate 12 also moves upward under the action of the recovery deformation of the second spring 122, thereby pulling the transmission belt 13 to rotate, and the second elastic plate 125 approaches the pressure rod 123 again, and the second elastic plate 125 is deflected in the vertical direction by the pressure rod 123 until the second contact plate 121 returns to the initial state along with the mounting plate 6 and the backlight module 4. This is the first rotation of the transmission belt 13 under the recovery of the thermal expansion of the backlight module 4;

[0048] When the contact plate 2 121 and the contact plate 1 12 are in the initial state, there is a certain gap between the ends of the elastic plate 1 124 and the elastic plate 2 125. At this time, the elastic plate 1 124 and the elastic plate 2 125 are separated, and the spring 2 122 is completely restored to its deformation again, and the contact plate 1 12 moves upward, thereby pulling the transmission belt 1 3 to rotate in the opposite direction again. By setting the range-extending mechanism 2, the transmission belt 1 3 can have two movements when the backlight module 4 recovers the thermal expansion. When the backlight module 4 recovers the thermal expansion, the transmission belt 1 On the basis of the rotation of the range-extending mechanism 2 and the resistance mechanism, the transmission belt 1 3 can be rotated for the second time through the cooperation of the range-extending mechanism 2 and the resistance mechanism, so that on the basis of the backlight module 4 recovering the motion state of thermal expansion, the rotation stroke of the transmission belt 1 3 is amplified by the range-extending mechanism 2, so that the stroke driven by the transmission mechanism is amplified, so that the movement amount of the range-extending mechanism 1 is increased, and the movement stroke of the push block 58 is further expanded, further ensuring that the opening and closing heat dissipation plate 2 can be smoothly closed without generating a large thermal expansion deformation.

[0049] The second range-extending mechanism includes a movable block 135 and a movable pulley 137 slidably arranged on the inner wall surface of the frame 1, and a fixed block 133 fixed on the frame 1. A pulling belt 136 is arranged between the movable block 135 and the fixed block 133 through the movable pulley 137. The pulling belt 136 is V-shaped as a whole. The movable block 135 is connected to the surface of the frame 1 through a spring 134. The second range-extending mechanism also includes a transmission belt 132 arranged on the frame 1, and a driving block 131 is arranged between the belt surface on one side of the transmission belt 132 and the movable pulley 137, and the belt surface on the side of the transmission belt 132 away from the driving block 131 is connected to the contact plate 12. When the opening and closing heat sink 2 is opened upward rapidly, the connecting frame 14 will also quickly push the top block 13 upward until the top block 13 contacts the movable block 135. Under the acceleration and inertia of the spring 1 31 restoring the deformation, the top block 13 hits the movable block 135 to move it upward. At this time, the spring 3 134 is deformed, and the movable pulley 137 and the driving block 131 are pulled upward by the pulling belt 2 136. At this time, the transmission belt 3 132 rotates clockwise, thereby causing the contact plate 12 to move downward through the transmission belt 3 132 to increase the travel of the contact mechanism.

[0050] It should be noted that after the top block 13 hits the movable block 135, the effect and acceleration brought by the inertia generated by the spring 1 31 recovering its deformation gradually disappear, and the spring 3 134 and the spring 1 31 recover their deformation. At this time, the spring 1 31 is in a state of no deformation, which is just the initial state of the spring 3 134 being stretched and deformed under the gravity of the movable block 135, so that the movable block 135 recovers to its initial state after being hit. Since the contact plate 2 121 moves downward under the action of the thermal expansion of the backlight module 4, and the contact plate 1 12 also moves downward a certain distance under the drive of the transmission belt 3 132 and is relatively fixed by the elastic plate 1 124 and the elastic plate 2 125, the transmission belt 3 132 and the movable pulley 137 will not move, and the pulling belt 2 136 is in a relaxed state at this time.

[0051] When the backlight module 4 is in the state of recovery from thermal expansion, the contact plate 1 12 and the contact plate 2 121 in the contact mechanism are raised in stages. When rising, the contact plate 1 12 drives the transmission belt 3 132 in the reverse direction, so that the transmission belt 3 132 pulls the movable pulley 137 downward through the driving block 131. Since the pulling belt 2 136 is in a relaxed state, it will not limit the movable pulley 137 until the movable pulley 137 moves downward to the original position so that the pulling belt 1 5 is tensioned. By setting the extended range mechanism 2, not only the movement stroke of the contact mechanism can be amplified, but also the connection can be tightened when the opening and closing heat dissipation plate 2 is quickly opened upward. The top block 13 on the frame 14 forms a buffer, which can convert the kinetic energy of the top block 13 and the connecting frame 14 into the amplification of the second stroke of the range-extending mechanism. Not only does it not need to set up a buffer structure to buffer the kinetic energy of the top block 13 moving upward quickly, but its acceleration, inertia and kinetic energy can also be utilized, which has a better practical effect; and when the opening and closing heat dissipation plate 2, the top block 13 and the connecting frame 14 are pulled downward by the pulling rope, the gravity of the opening and closing heat dissipation plate 2, the top block 13 and the connecting frame 14 is consistent with the pulling direction, gravity does work, and gravity assists the pulling, reducing the required pulling force, thereby facilitating the downward pulling of the opening and closing heat dissipation plate 2 to restore it to its original position;

[0052] The transmission mechanism includes shaft 1 91 and shaft 2 97 which are rotatably arranged on the inner wall surface of the frame 1. A transmission belt 2 9 is installed between shaft 1 91 and the rotating shaft of the transmission belt 3 via a synchronous wheel. A ratchet groove 92 is provided on the inner wall surface of shaft 1 91. A clamping plate 93 which abuts against the upper end surface of the ratchet groove 92 is installed on shaft 2 97 via an elastic member. Shaft 2 97 is connected to the range-extending mechanism 1 via a reciprocating motion part. When the transmission belt 3 rotates, shaft 1 91 can be made to rotate synchronously by the transmission belt 2 9, and the ratchet groove 92 and clamping plate 93 arranged on shaft 1 91 and shaft 2 97 can transmit the kinetic energy of the transmission belt 3 in one direction. When the backlight module 4 is in the stage of thermal expansion, shaft 2 97 does not rotate, and when the backlight module 4 recovers its deformation, shaft 2 97 rotates, thereby transmitting power to the range-extending mechanism 1 through the reciprocating motion part, so that the driving block 58 pushes the rack 1 53 to return to its original position, so that the opening and closing heat dissipation plate 2 is pressed down to dissipate the heat on the frame 1. The opening is closed, that is, when the backlight module 4 is in the stage of thermal expansion, when the rack 1 53 and the rack 2 55 move away from each other, the push block 58 does not move until the opening and closing heat dissipation plate 2 is fully opened, and after the rack 1 53 moves to the maximum stroke, the rack 1 53 is at the closest distance to the push block 58, and then when the backlight module 4 is in the recovery state, when the transmission belt 1 3 undergoes two reverse rotations, after passing through the transmission belt 2 9, the shaft 2 97 is driven to rotate via the shaft 1 91, so that the range-extending mechanism 1 drives the push block 58 to push the rack 1 53 to return to its original position through the reciprocating motion part.

[0053] The reciprocating motion part includes a center wheel 95 fixedly set on the axial surface of shaft 97, and meshing teeth 94 are provided on the inner wall surfaces of the center wheel 95 and shaft 97, and the teeth of the meshing teeth 94 on the center wheel 95 and the inner wall surface of shaft 97 are oriented in opposite directions. A gear 3 96 is provided between the center wheel 95 and the inner wall of shaft 97, and one side end thereof is rotatably set to the inner wall surface of frame 1. When shaft 97 rotates, gear 3 96 alternately meshes with the inner wall surface of shaft 97 and the meshing teeth 94 on the center wheel 95. When shaft 2 97 rotates, center wheel 95 thereon rotates together with shaft 2 97, and the inner wall surface of shaft 2 97 and the outer wall of center wheel 95 are both provided with meshing teeth 2 94. Thus, when gear 3 96 meshes with the two groups of meshing teeth 2 94 alternately, gear 3 96 will perform bidirectional reciprocating rotation when shaft 2 97 and center wheel 95 rotate unidirectionally. By setting up range-extending mechanism 2, the movement stroke of transmission belt 1 3 is enlarged by the interference mechanism, so that when the backlight module 4 is restored, shaft 1 91 and shaft 2 97 can be rotated one circle through transmission belt 1 3 and transmission belt 2 9, so that gear 3 96 performs a complete reciprocating motion. Of course, this function can also be assisted by changing the radius ratio of the synchronous wheel on transmission belt 1 3 and shaft 1 91.

[0054] The range-extending mechanism 1 includes a connecting rod 2 71 and a connecting rod 3 72 which are rotatably arranged with each other, wherein the end of the connecting rod 2 71 is fixedly connected to the surface of the gear 3 96, and the end of the connecting rod 3 72 is rotatably provided with a limit block 75 which is slidably connected to the bottom surface of the frame 1, and the push block 58 is fixed to the end surface of the limit block 75 on the extension line of the rack 1 53;

[0055] It should be noted that the second connecting rod 71 is used as a driving connecting rod, and the third connecting rod 72 is used as a driven connecting rod. The length of the second connecting rod 71 is less than the length of the third connecting rod 72. The second connecting rod 71 and the third connecting rod 72 form a simple parallelogram mechanism. Then, when they rotate at the same angle, the end point of the third connecting rod 72 will pass through a longer arc length, thereby achieving stroke amplification. In this way, when the backlight module 4 recovers from thermal expansion, the gear 3 96 drives the limit block 75 to perform a reciprocating motion through a reciprocating motion, and the rotation stroke of the gear 3 96 is amplified, so that the limit block 75 slides on the frame 1. When the gear 3 96 rotates in the opposite direction, the limit block 75 is restored to its original position. In this process, when the limit block 75 moves toward the direction close to the rack 1 53, it pushes the rack 1 53 to move, and the rack 1 53 and the rack 2 55 are brought close to each other through the gear 1 57, so that the opening and closing heat sink 2 is pulled downward by the pulling belt 1 5 to close it. When the gear 3 96 rotates in the opposite direction, the limit block 75 is moved toward the initial direction until the push block 58 is restored to its original position, so that the opening and closing heat sink 2 is closed after it is opened next time.

[0056] It should be noted that when the opening and closing heat sink 2 is restored, the meshing teeth 33 on the transmission belt 3 cooperate with the gear set 34 to restore the rotating rod 35 to its original position, so that the rotating rod 35 is again in contact with the end of the connecting block 32, thereby re-limiting the opening and closing heat sink 2.

[0057] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A backlight module for an LCD liquid crystal display, comprising a frame (1) and a backlight module (4) body arranged in the frame (1), wherein a lamp holder (11) and a mounting plate (6) which are in conflict with each other are arranged on the inner wall surface of the frame (1), wherein: The mounting plate (6) is provided with a lamp groove (8), the lamp frame (11) is provided with lamp beads (10) plugged into the lamp groove (8), the mounting plate (6) is fixedly arranged on the bottom surface of the backlight module (4), and is characterized in that the backlight module (4) of the LCD liquid crystal display further comprises: An opening and closing heat dissipation plate (2) is arranged at the heat dissipation port of the frame (1) and is slidably connected to the inner wall of the frame (1); a resistance mechanism and a quick opening mechanism are arranged between the opening and closing heat dissipation plate (2) and the mounting plate (6); when the main body of the backlight module (4) expands due to heat and begins to press the resistance mechanism downward through the mounting plate (6), the resistance mechanism drives the quick opening mechanism to quickly open the opening and closing heat dissipation plate (2).

2. The backlight module of an LCD liquid crystal display according to claim 1, characterized in that: The resistance mechanism comprises a resistance plate 1 (12) and a resistance plate 2 (121) connected via a spring 2 (122), wherein the resistance plate 1 (12) is slidably arranged on the resistance plate 2 (121), and the resistance plate 2 (121) is fixed on the bottom surface of the mounting plate (6); The quick opening mechanism comprises a transmission belt (3) mounted on the inner wall surface of the frame (1) and a connecting block (32) fixed on the surface of the opening and closing heat dissipation plate (2); the connecting block (32) is connected to the surface of the frame (1) through a spring (31); a gear group (34) meshing with each other is also arranged on the inner wall surface of the frame (1); a meshing tooth (33) meshing with one of the gears in the gear group (34) is arranged on the belt surface of the transmission belt (3); an end of the abutment plate (12) is connected to the belt surface of the transmission belt (3) on the other side away from the meshing tooth (33); a rotating rod (35) is fixed on the axial surface of another gear in the gear group (34); and the rotating rod (35) is arranged obliquely and its end abuts against the end of the connecting block (32).

3. The backlight module of an LCD liquid crystal display according to claim 2, characterized in that: The backlight module (4) of the LCD liquid crystal display further comprises a closing mechanism, which is used to restore the openable heat dissipation plate (2) and re-close the heat dissipation opening of the frame (1) after heat dissipation is completed and the main body of the backlight module (4) recovers from thermal expansion; The closing mechanism comprises a limiting slide rail (51), a rack one (53) and a rack two (55) which are arranged on the inner wall surface of the frame (1) from top to bottom in sequence, wherein two sliders (52) are slidably arranged in the limiting slide rail (51) and two steering wheels (54) are rotatably arranged, and a pulling belt one (5) is fixedly arranged on the two sliders (52), and the ends of the two pulling belts one (5) after passing through the two steering wheels (54) are fixed to the bottom surface of the connecting frame (14), and the connecting frame (14) is slidably arranged on the inner wall surface of the frame (1) and is fixedly connected to the connecting block (32); the frame (1) is provided with a gear 1 (57) rotatably arranged between the rack 1 (53) and the rack 2 (55); the rack 1 (53) and the rack 2 (55) are both slidably arranged on the surface of the frame (1); the gear 1 (57) is meshed with the rack 1 (53) and the rack 2 (55) at the same time; the two sliders (52) are respectively connected to the rack 1 (53) and the rack 2 (55) through a connecting rod (56).

4. The backlight module of an LCD liquid crystal display according to claim 3, characterized in that: The backlight module of the LCD liquid crystal display further comprises an extending mechanism 1 arranged on the frame (1), and the extending mechanism 1 is connected to the transmission belt 1 (3) through a transmission mechanism, and the closing mechanism further comprises a pushing block (58) arranged on the extending mechanism 1 and located on the extension line of the rack 1 (53), after the heat dissipation is completed and the main body of the backlight module (4) is recovered from thermal expansion, the extending mechanism 1 is driven by the transmission mechanism to amplify the rotation stroke of the transmission belt 1 (3), and at the same time, the extending mechanism 1 drives the pushing block (58) to push the rack 1 (53), thereby increasing the stroke of the rack 1 (53) and the rack 2 (55) approaching each other.

5. The backlight module of an LCD liquid crystal display according to claim 4, characterized in that: The abutment mechanism further comprises a pressure rod (123), an elastic plate 1 (124) and an elastic plate 2 (125), wherein the pressure rod (123) is fixedly arranged on the surface of the frame (1), and the elastic plate 1 (124) and the elastic plate 2 (125) are respectively rotatably arranged on the surfaces of the abutment plate 1 (12) and the abutment plate 2 (121) close to each other through a torsion spring, and the pressure rod (123) abuts against the surface of the elastic plate 2 (125); The backlight module of the LCD liquid crystal display further comprises a second range-extending mechanism arranged on the frame (1) and connected to the first contact plate (12); a top block (13) is fixedly arranged on the connecting frame (14); when the opening and closing heat dissipation plate (2) is quickly opened upward, the top block (13) abuts against the second range-extending mechanism, and the first contact plate (12) pushes the first transmission belt (3) to rotate again through the second range-extending mechanism.

6. The backlight module of an LCD liquid crystal display according to claim 5, characterized in that: The second range-extending mechanism comprises a movable block (135) and a movable pulley (137) slidably arranged on the inner wall surface of the frame (1), and a fixed block (133) fixedly arranged on the frame (1); a pulling belt (136) is arranged between the movable block (135) and the fixed block (133) through the movable pulley (137); the pulling belt (136) is V-shaped as a whole; the movable block (135) is connected to the surface of the frame (1) through a spring (134); the second range-extending mechanism also comprises a transmission belt (132) arranged on the frame (1); a driving block (131) is arranged between the belt surface on one side of the transmission belt (132) and the movable pulley (137); and the belt surface on the side of the transmission belt (132) away from the driving block (131) is connected to the first contact plate (12).

7. The backlight module of an LCD liquid crystal display according to claim 6, characterized in that: The transmission mechanism comprises a shaft 1 (91) and a shaft 2 (97) rotatably arranged on the inner wall surface of a frame (1); a transmission belt 2 (9) is installed between the shaft 1 (91) and the rotating shaft of the transmission belt 1 (3) via a synchronous wheel; a ratchet groove (92) is provided on the inner wall surface of the shaft 1 (91); a clamping plate (93) abutting against the upper end surface of the ratchet groove (92) is installed on the shaft 2 (97) via an elastic member; and the shaft 2 (97) is connected to the range-extending mechanism 1 via a reciprocating motion part.

8. The backlight module of an LCD display according to claim 7, characterized in that: The reciprocating motion part comprises a center wheel (95) fixedly arranged on the axial surface of the second shaft (97), and the center wheel (95) and the inner wall surface of the second shaft (97) are both provided with a second tooth (94), and the teeth of the center wheel (95) and the second tooth (94) on the inner wall surface of the second shaft (97) are oriented in opposite directions, and a gear (96) is arranged between the center wheel (95) and the inner wall of the second shaft (97) with one end thereof rotatably arranged with the inner wall surface of the frame (1), and when the second shaft (97) rotates, the gear (96) alternately meshes with the inner wall surface of the second shaft (97) and the second tooth (94) on the center wheel (95).

9. The backlight module of an LCD display according to claim 8, characterized in that: The range-extending mechanism 1 comprises a connecting rod 2 (71) and a connecting rod 3 (72) which are rotatably arranged relative to each other, wherein the end of the connecting rod 2 (71) is fixedly connected to the surface of the gear 3 (96), and the end of the connecting rod 3 (72) is rotatably provided with a limit block (75) which is slidably connected to the bottom surface of the frame (1), and the push block (58) is fixed to the end surface of the limit block (75) on the extension line of the rack 1 (53).

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