Liquid crystal display device and direct type Local dimming backlight module

Abstract

The invention discloses a liquid crystal display device and a direct type Local dimming backlight module, and relates to the technical field of liquid crystal display, the liquid crystal display device comprises an outer shell, an optical film set and a liquid crystal panel, the optical film set and the liquid crystal panel are fixedly arranged at the light emitting end of the outer shell, the backlight module is fixedly installed in an inner cavity of the outer shell, and a conveying pump set is connected with the liquid crystal panel through a cooling liquid circulating conveying pipeline. Cooling liquid obtained after refrigeration and cooling in the refrigeration mechanism can be circularly introduced into the cooling cavity to conduct water cooling on the backlight module, while water cooling is conducted on the backlight module, the conveying pump set can drive the cooling and dehumidifying mechanism to work through linkage of the linkage mechanism, the cooling and dehumidifying mechanism can suck out gas in the liquid crystal display device, and therefore the liquid crystal display device is cooled. After refrigeration and drying are conducted through the refrigeration mechanism and the drying assembly, air is blown into the liquid crystal display device, secondary air cooling can be conducted on the liquid crystal display device, the interior of the liquid crystal display device can be dehumidified, and it can be avoided that electrical components in the liquid crystal display device are corroded by moisture and damaged quickly.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal display, in particular to a liquid crystal display device and a direct-down Local dimming backlight module. Background Art

[0002] Since its birth in 1968, liquid crystal display technology has been developing with vigorous vitality in the display industry. As a mature technology with many years of development history, it has been widely used in many fields with its characteristics of low power consumption, low cost, high resolution, high brightness and wide viewing angle. Liquid crystal display screens cannot emit light on their own and need to be equipped with backlight modules to display colorful images. Commonly used backlight modules include direct-type backlight modules and edge-type backlight modules. Direct-type backlight modules are relatively low in cost, and direct-type backlight modules can achieve zone dimming, so direct-type backlight modules are widely used; When existing liquid crystal display devices and direct-type backlight modules are used in some harsh high-temperature environments, their own heat dissipation structures alone cannot meet the heat dissipation requirements. If the heat cannot be dissipated in a timely manner, the service life of the LED lamp will be seriously affected. In addition, existing liquid crystal display devices and direct-type backlight modules do not have a dehumidification function. When used in harsh environments, their internal electrical components are easily corroded by moisture and are damaged faster. Summary of the invention

[0003] In order to solve the defects in the prior art, the present invention provides a liquid crystal display device and a direct-type Local dimming backlight module.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: A liquid crystal display device, comprising an outer shell, an optical film group and a liquid crystal panel fixedly arranged at a light-emitting end of the outer shell, a backlight module fixedly installed in the inner cavity of the outer shell, a cooling cavity is opened in the inner part of the outer shell below the backlight module, a protective cover and a cooling liquid circulation delivery pipeline are fixedly arranged at the bottom end of the outer shell, a refrigeration mechanism and a delivery pump group are connected to the cooling liquid circulation delivery pipeline, one end of the delivery pump group is fixedly connected to a linkage mechanism, the end of the linkage mechanism is connected to a cooling and dehumidifying mechanism, and guide plates are fixedly arranged in the inner cavity of the cooling cavity at equal intervals; The cooling and dehumidifying mechanism includes a hollow cylinder and a linkage plate connected to the end of the linkage mechanism, a push-pull rod is fixedly provided on one side of the linkage plate, one end of the push-pull rod is fixedly connected to a piston assembly, and the piston assembly is installed inside the hollow cylinder, one end of the hollow cylinder is connected to an air intake pipe through a pipe fitting, and an air intake branch pipe is equidistantly connected to the air intake pipe, a first one-way valve is provided on the pipe fitting connecting the air intake pipes of the hollow cylinder, an air blowing pipe is connected to the air blowing pipe through a pipe fitting on the outside, and an air blowing branch pipe is equidistantly connected to the air blowing pipe, and one end of the air blowing branch pipe and one end of the air suction branch pipe are both penetrated into the interior of the outer shell, a drying assembly is connected to the pipe fitting connecting the air intake pipe and the air blowing pipe, and a second one-way valve is provided on the pipe fitting connecting the hollow cylinder and the air blowing pipe.

[0005] As a preferred technical solution of the present invention, the guide plate divides the inner cavity of the cooling cavity into a serpentine structure.

[0006] As a preferred technical solution of the present invention, the refrigeration mechanism includes a refrigeration liquid storage container fixedly mounted on the backlight end of the outer shell, an air refrigeration container is fixedly arranged outside the refrigeration liquid storage container, a semiconductor refrigeration assembly is fixedly arranged outside the air refrigeration container, refrigeration fins are fixedly arranged at equidistant intervals at the refrigeration end of the semiconductor refrigeration assembly, and one end of the refrigeration fins penetrates the air refrigeration container and is arranged inside the refrigeration liquid storage container; The air refrigeration container is installed on the pipe fitting connected between the hollow cylinder and the air suction main pipe.

[0007] As a preferred technical solution of the present invention, the delivery pump group includes a pump body connected to the coolant circulation delivery pipeline, a rotating motor is fixedly installed at one end of the pump body, an impeller assembly is fixedly connected to the end of the output shaft of the rotating motor, and the impeller assembly is rotatably installed inside the pump body.

[0008] As a preferred technical solution of the present invention, the linkage mechanism includes a connecting plate fixedly mounted on the outside of one end of the pump body and a transmission gear fixedly connected to the impeller assembly through a shaft, the outside of the connecting plate is rotatably connected to a linkage gear through a rotating shaft, a driving rod is eccentrically fixed on the surface of the linkage gear, and the linkage plate is sleeved on the outside of one end of the driving rod; The size of the linkage gear is larger than that of the transmission gear, and the linkage gear is meshed with the transmission gear.

[0009] As a preferred technical solution of the present invention, the drying component includes a drying box body connected to the pipe between the suction pipe and the blowing pipe, and cylindrical mesh sleeves are fixedly arranged at equal intervals inside the drying box body, and the cylindrical mesh sleeves are filled with silica gel desiccant particles.

[0010] As a preferred technical solution of the present invention, the optical film set consists of a lower diffusion plate, a brightness enhancement film, and an upper diffusion plate arranged in sequence from bottom to top, and the top surface of the brightness enhancement film is set as a prism structure.

[0011] A direct-down local dimming backlight module includes a circuit board fixedly mounted inside an outer shell, a connecting pillar with threaded holes and an LED light group are fixedly arranged on the top surface of the circuit board, a reflective component is fixedly connected to the top of the connecting pillar by screws, and the reflective component is sleeved on the outside of the LED light group.

[0012] As a preferred technical solution of the present invention, the LED lamp group includes an LED lamp mounting base fixedly mounted on the top of the circuit board and an LED lamp fixedly mounted on the top of the LED lamp mounting base, a positive wiring pin and a negative wiring pin are symmetrically arranged on the outer side of the LED lamp mounting base, a heat conducting rod is fixedly arranged at the bottom end of the LED lamp mounting base, and the bottom end of the heat conducting rod is passed through the cooling cavity.

[0013] As a preferred technical solution of the present invention, the reflective assembly includes a reflective bottom plate and a reflective cup equidistantly fixed on the top of the reflective bottom plate, and the LED lamp is inserted into the reflective cup, and reflective side panels are symmetrically fixed on the outside of the reflective bottom plate.

[0014] The beneficial effects of the present invention are: 1. This type of liquid crystal display device and direct-type local dimming backlight module are provided with a cooling chamber, a coolant circulation delivery pipeline, a delivery pump group, and a refrigeration mechanism. The delivery pump group can circulate the coolant after refrigeration and cooling in the refrigeration mechanism into the cooling chamber through the coolant circulation delivery pipeline to water-cool the backlight module. While the backlight module is water-cooled, the delivery pump group can drive the cooling and dehumidification mechanism to work through the linkage mechanism. The cooling and dehumidification mechanism can absorb the gas inside the liquid crystal display device, cool and dry it through the refrigeration mechanism and the drying component, and then blow it into the liquid crystal display device. Not only can the liquid crystal display device be cooled and cooled twice, but the interior of the liquid crystal display device can also be dehumidified, so that the electrical components inside the liquid crystal display device can be prevented from being damaged by moisture, and the service life of the liquid crystal display device and the direct-type local dimming backlight module can be effectively improved.

[0015] 2. This type of liquid crystal display device and direct-type local dimming backlight module, by arranging a heat conducting rod at the bottom of the LED lamp group, the heat generated by the LED lamp group when working can be directly transferred to the cooling chamber through the heat conducting rod, so that the coolant circulating in the cooling chamber can directly cool the LED lamp group, which can effectively improve the cooling effect. By arranging a guide plate to divide the cooling chamber into a serpentine structure, the flow path of the coolant inside the cooling chamber can be increased, which can further improve the cooling effect. The semiconductor refrigeration component can cool and cool the gas flowing through the air refrigeration container through the refrigeration plate. While the refrigeration plate cools and cools the gas, it can condense and remove the water vapor mixed in the gas.

[0016] 3. This liquid crystal display device and direct-type local dimming backlight module, by setting a reflective component, the reflective component can separate the various light sources on the circuit board into independent light sources through the reflective cup on the reflective component, and can divide the entire screen into multiple areas, so that the system can independently adjust and control the brightness of each area, and the backlight can be synchronized with the display signal of the liquid crystal panel. When an area is completely white, the LED array in this area is all lit, and when an area is completely black, the LED array under this area is all turned off. The brightness of the LED array can be controlled in different areas, which can not only effectively reduce power consumption, but also avoid mutual influence between light sources, improve image quality, and the light emitted by the LED lamp group can be fully reflected to the front of the backlight module through the reflective cup. The reflective cup is integrally arranged on the reflective component, and can be installed at one time without the need to install them separately, and the installation and disassembly are convenient. The light emitted by the LED lamp group can be reflected twice by the reflective bottom plate and the reflective side plate on the reflective component, which can further improve the luminous efficiency and brightness of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall cross-sectional structure of a liquid crystal display device and a direct-type local dimming backlight module of the present invention; Figure 2 It is a partial cross-sectional structural schematic diagram of a liquid crystal display device and a direct-type local dimming backlight module of the present invention; Figure 3 The present invention Figure 2 A is an enlarged structural diagram; Figure 4 It is a bottom view structural schematic diagram of the outer shell of the present invention; Figure 5 It is a schematic diagram of the connection structure of the coolant circulation delivery pipeline, the refrigeration mechanism, the delivery pump group, the linkage mechanism and the cooling and dehumidification mechanism in the present invention; Figure 6 The present invention Figure 5 The enlarged structural diagram at B in FIG. Figure 7 It is a schematic diagram of the connection structure of the delivery pump group, the linkage mechanism and the cooling and dehumidification mechanism in the present invention; Figure 8 It is a cross-sectional structural schematic diagram of the delivery pump group and the cooling and dehumidification mechanism in the present invention; Fig. 9 It is a cross-sectional structural schematic diagram of the refrigeration mechanism in the present invention; Fig.10 It is a schematic diagram of the connection structure between the LED lamp group and the reflective component in the present invention; Fig.11 It is a schematic cross-sectional structural diagram of the outer shell in the present invention.

[0018] In the figure: 1. outer shell; 2. Optical film set; 3. LCD panel; 4. Backlight module; 401. Circuit board; 402. Connecting pillar; 403. LED lamp group; 404. Reflection assembly; 4031. LED lamp mounting seat; 4032. LED lamp; 4033. Positive electrode wiring pin; 4034. Negative electrode wiring pin; 4035. Heat conducting rod; 4041. Reflection bottom plate; 4042. Reflection cup; 4043. Reflection side plate; 5. Cooling chamber; 6. Protective cover; 7. Coolant circulation pipeline; 8. Refrigeration mechanism; 801. Refrigeration liquid storage container; 802. Air refrigeration container; 803. Semiconductor refrigeration component; 804. Refrigeration sheet; 9. Delivery pump group; 901. Pump body; 902. Rotating motor; 903. Impeller assembly; 10. linkage mechanism; 1001. connecting plate; 1002. transmission gear; 1003. linkage gear; 1004. driving rod; 11. Cooling and dehumidifying mechanism; 1101. Hollow cylinder; 1102. Linkage plate; 1103. Push-pull rod; 1104. Piston assembly; 1105. Air suction main pipe; 1106. Air suction branch pipe; 1107. First one-way valve; 1108. Air blowing main pipe; 1109. Air blowing branch pipe; 1110. Drying assembly; 1111. Second one-way valve; 11101. Drying box; 11102. Columnar mesh sleeve; 11103. Silica gel desiccant particles; 12. Guide plate. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0020] Example: Figure 1-11 As shown, a liquid crystal display device comprises an outer shell 1 and an optical film group 2 and a liquid crystal panel 3 fixedly arranged at the light-emitting end of the outer shell 1. A backlight module 4 is fixedly installed in the inner cavity of the outer shell 1. A cooling cavity 5 is opened inside the outer shell 1 below the backlight module 4. A protective cover 6 and a coolant circulation delivery pipeline 7 are fixedly arranged at the bottom end of the outer shell 1. A refrigeration mechanism 8 and a delivery pump group 9 are connected to the coolant circulation delivery pipeline 7. A linkage mechanism 10 is fixedly connected to one end of the delivery pump group 9. A cooling and dehumidifying mechanism 11 is connected to the end of the linkage mechanism 10. The delivery pump group 9 can cool the inside of the refrigeration mechanism 8 through the coolant circulation delivery pipeline 7. The cooling liquid after refrigeration and cooling is circulated into the cooling chamber 5 to cool the backlight module 4. While cooling the backlight module 4, the delivery pump group 9 can drive the cooling and dehumidification mechanism 11 to work through the linkage mechanism 10. The cooling and dehumidification mechanism 11 can suck out the gas inside the liquid crystal display device, cool and dry it, and then blow it into the liquid crystal display device. It can not only perform secondary air cooling on the liquid crystal display device, but also dehumidify the inside of the liquid crystal display device, which can prevent the electrical components inside from being damaged by moisture, and effectively improve the service life of the liquid crystal display device and the direct-type local dimming backlight module. The cooling chamber 5 is equidistantly fixed with guide plates 12; The cooling and dehumidifying mechanism 11 comprises a hollow cylinder 1101 and a linkage plate 1102 connected to the end of the linkage mechanism 10, a push-pull rod 1103 is fixedly provided on one side of the linkage plate 1102, a piston assembly 1104 is fixedly connected to one end of the push-pull rod 1103, and the piston assembly 1104 is installed inside the hollow cylinder 1101, one end of the hollow cylinder 1101 is connected to an air suction pipe 1105 through a pipe fitting, and an air suction branch pipe 1106 is equidistantly connected to the air suction pipe 1105, and the hollow cylinder 1101 is connected to the air suction pipe 1105 through a pipe fitting. A first non-return valve 1107 is provided on the pipe fitting connected between the cylinder 1101 and the air suction pipe 1105. The outer side of one end of the hollow cylinder 1101 is connected to a blowing pipe 1108 through a pipe fitting. The blowing pipe 1108 is connected to an air blowing branch pipe 1109 at an equal distance. One end of the air blowing branch pipe 1109 and one end of the air suction branch pipe 1106 are both arranged inside the outer shell 1. A drying component 1110 is connected to the pipe fitting connected between the air suction pipe 1105 and the air blowing pipe 1108. The hollow cylinder 1 A second one-way valve 1111 is provided on the pipe connecting 101 and the blowing pipe 1108. The first one-way valve 1107 is provided so that the cooling and dehumidifying mechanism 11 can only inhale air through the suction pipe 1105 but cannot blow air. The second one-way valve 1111 is provided so that the cooling and dehumidifying mechanism 11 can only blow air through the blowing pipe 1108 but cannot inhale air. When in use, the conveying pump group 9 can drive the linkage plate 1102 on the cooling and dehumidifying mechanism 11 to reciprocate left and right through the linkage mechanism 10. When the linkage plate 1102 reciprocates left and right, the piston assembly 1104 can be pulled to reciprocate left and right by the push-pull rod 1103 to perform suction and blowing operations. The gas inside the liquid crystal display device can be sucked out, and the sucked out gas is refrigerated and dried before being blown into the liquid crystal display device. Not only can the liquid crystal display device be cooled and cooled twice, but the interior of the liquid crystal display device can also be dehumidified, so that the electrical components inside the liquid crystal display device can be prevented from being damaged by moisture.

[0021] Among them, the guide plate 12 divides the inner cavity of the cooling chamber 5 into a serpentine structure. By dividing the cooling chamber 5 into a serpentine structure through the guide plate 12, the flow path of the coolant inside the cooling chamber 5 can be improved, and the cooling effect can be further improved.

[0022] The refrigeration mechanism 8 includes a refrigerant liquid storage container 801 fixedly mounted on the backlight end of the outer shell 1, an air refrigeration container 802 fixedly mounted on the outside of the refrigerant liquid storage container 801, a semiconductor refrigeration assembly 803 fixedly mounted on the outside of the air refrigeration container 802, a refrigeration plate 804 fixedly mounted at an equidistant distance at the refrigeration end of the semiconductor refrigeration assembly 803, and one end of the refrigeration plate 804 penetrates through the air refrigeration container 802 and is arranged inside the refrigerant liquid storage container 801. In the process of sucking out the gas inside the liquid crystal display device through the cooling and dehumidifying mechanism 11, the sucked out gas flows through the air refrigeration container 802 on the refrigeration mechanism 8, and the semiconductor refrigeration assembly 803 can cool and cool the gas flowing through the air refrigeration container 802 through the refrigeration plate 804. While the refrigeration plate 804 cools and cools the gas, it can condense and remove the water vapor mixed in the gas. The air refrigeration container 802 is installed on the pipe fitting connecting the hollow cylinder 1101 and the air suction main pipe 1105 .

[0023] Among them, the delivery pump group 9 includes a pump body 901 which is connected to the coolant circulation delivery pipeline 7. A rotating motor 902 is fixedly installed at one end of the pump body 901. An impeller assembly 903 is fixedly connected to the end of the output shaft of the rotating motor 902. The impeller assembly 903 is rotatably installed inside the pump body 901. The rotating motor 902 drives the impeller assembly 903 to rotate to circulate the coolant.

[0024] The linkage mechanism 10 includes a connecting plate 1001 fixedly mounted on the outside of one end of the pump body 901 and a transmission gear 1002 fixedly connected to the impeller assembly 903 through a shaft. The outer side of the connecting plate 1001 is rotatably connected to the linkage gear 1003 through a rotating shaft. A driving rod 1004 is eccentrically fixed on the surface of the linkage gear 1003, and the linkage plate 1102 is sleeved on the outer side of one end of the driving rod 1004. The rotating motor 902 drives the impeller assembly 903 to rotate to circulate and transport the coolant. At the same time, the transmission gear 1002 can be driven to rotate, and the transmission gear 1002 can be meshed to drive the linkage gear 1003 to rotate. When the linkage gear 1003 rotates, it can drive the driving rod 1004 to rotate eccentrically. When the driving rod 1004 rotates eccentrically, it can be linked to drive the linkage plate 1102 on the cooling and dehumidification mechanism 11 to reciprocate left and right. When the linkage plate 1102 reciprocates left and right, the piston assembly 1104 can be pulled by the push-pull rod 1103 to reciprocate left and right to perform suction and blowing operations; The size of the linkage gear 1003 is larger than that of the transmission gear 1002, and the linkage gear 1003 is meshingly connected with the transmission gear 1002. The size of the linkage gear 1003 is larger than that of the transmission gear 1002, which can play a role in deceleration and adjust the frequency of the reciprocating motion of the piston assembly 1104 to avoid the frequency of the reciprocating motion of the piston assembly 1104 being too fast.

[0025] Among them, the drying component 1110 includes a drying box body 11101 on a pipe fitting connected between the air intake pipe 1105 and the air blowing pipe 1108, and cylindrical mesh sleeves 11102 are fixedly arranged at equal intervals inside the drying box body 11101. The cylindrical mesh sleeves 11102 are filled with silica gel desiccant particles 11103. After the semiconductor refrigeration component 803 cooperates with the refrigeration plate 804 to condense and remove the water vapor mixed in the gas, the treated gas is transported to the drying component 1110, and the silica gel desiccant particles 11103 in the inner cavity of the drying component 1110 can dry the gas. After drying, the gas is recycled into the liquid crystal display device, and the liquid crystal display device can be cooled by secondary air cooling and dehumidified at the same time.

[0026] Among them, the optical film group 2 is composed of a lower diffusion plate, a brightness enhancement film, and an upper diffusion plate which are arranged in sequence from bottom to top, and the top surface of the brightness enhancement film is set to a prism structure. The brightness enhancement film can adjust the angle of light passing through the brightness enhancement film so that it is mainly concentrated in the range near the normal angle of the surface of the brightness enhancement film. Light with a large angle will be totally reflected back into the backlight cavity, while light with a small angle will be more concentrated in the normal direction. When the human eye looks directly at the liquid crystal display device, the brightness will be significantly improved, and when it exceeds a certain angle, the brightness will be reduced so that the picture cannot be seen clearly. The brightness enhancement film can increase the brightness in the angle range near the display and reduce the brightness in other angle ranges. In the process of multiple total reflections of the brightening film, a considerable part of the light beam will be absorbed, so that the light emission angle of the light source can be controlled within the angle range of the maximum transmittance efficiency of the brightening film, which can significantly improve the light energy utilization rate of the liquid crystal display device and reduce the manufacturing cost of the liquid crystal display device.

[0027] A direct-down local dimming backlight module, the backlight module 4 includes a circuit board 401 fixedly installed inside an outer shell 1, a connecting pillar 402 with a threaded hole and an LED lamp group 403 are fixedly provided on the top surface of the circuit board 401, a reflective component 404 is fixedly connected to the top of the connecting pillar 402 by screws, and the reflective component 404 is sleeved on the outside of the LED lamp group 403.

[0028] Among them, the LED lamp group 403 includes an LED lamp mounting base 4031 fixedly mounted on the top of the circuit board 401 and an LED lamp 4032 fixedly mounted on the top of the LED lamp mounting base 4031. A positive wiring pin 4033 and a negative wiring pin 4034 are symmetrically arranged on the outer side of the LED lamp mounting base 4031. A heat conducting rod 4035 is fixedly arranged at the bottom end of the LED lamp mounting base 4031, and the bottom end of the heat conducting rod 4035 is penetrated into the cooling cavity 5. The LED lamp group 403 can directly transfer the heat generated during operation to the cooling cavity 5 through the heat conducting rod 4035, so that the coolant circulating in the cooling cavity 5 can directly cool the LED lamp group 403, which can effectively improve the cooling effect.

[0029] The reflective assembly 404 includes a reflective bottom plate 4041 and a reflective cup 4042 equidistantly fixed on the top of the reflective bottom plate 4041, and the LED lamp 4032 is inserted into the reflective cup 4042. A reflective side plate 4043 is symmetrically fixed on the outer side of the reflective bottom plate 4041. The reflective assembly 404 can separate the light sources on the circuit board 401 into independent light sources through the reflective cup 4042 thereon, and can divide the entire screen into multiple areas, so that the system can independently adjust and control the brightness of each area, and can synchronize the backlight with the display signal of the liquid crystal panel 3. When an area is completely white, the LED array of this area is all lit, and when an area is completely black, the LED array under this area is all lit. The D array is completely turned off, and the brightness of the LED array can be controlled in different areas, which can not only effectively reduce power consumption, but also avoid mutual influence between light sources, improve image quality, and the light emitted by the LED lamp group 403 can be fully reflected to the front of the backlight module 4 through the reflective cup 4042, which can improve the luminous efficiency and brightness. The reflective cup 4042 is integrally arranged on the reflective component 404, and can be installed at one time without the need for separate installation. The installation and disassembly are convenient, and the light emitted by the LED lamp group 403 can be reflected for a second time through the reflective bottom plate 4041 and the reflective side plate 4043 on the reflective component 404, which can further improve the luminous efficiency and brightness of the backlight module 4.

[0030] During operation, the delivery pump group 9 can circulate the coolant after refrigeration and cooling inside the refrigeration mechanism 8 into the cooling chamber 5 through the coolant circulation delivery pipeline 7 to cool the backlight module 4 by water. During water cooling, the LED lamp group 403 can directly transfer the heat generated during operation to the cooling chamber 5 through the heat conducting rod 4035, so that the coolant circulating in the cooling chamber 5 can directly cool the LED lamp group 403, which can effectively improve the cooling effect. While the backlight module 4 is being water-cooled, the delivery pump group 9 can drive the transmission gear 1002 to rotate, and the transmission gear 1002 can mesh and drive the linkage gear 1003 to rotate. When the linkage gear 1003 rotates, it can drive the driving rod 1004 to rotate eccentrically. When the driving rod 1004 rotates eccentrically, the linkage plate 1102 on the cooling and dehumidifying mechanism 11 can be driven to reciprocate left and right. When the linkage plate 1102 reciprocates left and right, the piston assembly 1104 can be pulled to reciprocate left and right by the push-pull rod 1103 to perform suction and blowing operations, so that the gas inside the liquid crystal display device can be sucked out, and the sucked out gas is cooled and dried before being blown into the liquid crystal display device. Not only can the liquid crystal display device be cooled by secondary air cooling, but the interior of the liquid crystal display device can also be dehumidified, so that the electrical components inside the liquid crystal display device can be prevented from being damaged by moisture, and the service life of the liquid crystal display device and the direct-type Local dimming backlight module can be effectively improved. In the process of sucking out the gas inside the liquid crystal display device through the cooling and dehumidifying mechanism 11, the sucked out gas flows through the air refrigeration container 802 on the refrigeration mechanism 8, and the semiconductor refrigeration component 803 can cool and cool the gas flowing through the air refrigeration container 802 through the refrigeration plate 804. While the refrigeration plate 804 cools and cools the gas, it can condense and remove the water vapor mixed in the gas. After the semiconductor refrigeration component 803 cooperates with the refrigeration plate 804 to condense and remove the water vapor mixed in the gas, the treated gas is transported to the drying component 1110, and the silica gel desiccant particles 11103 in the inner cavity of the drying component 1110 can dry the gas. After the gas is dried, it is circulated into the liquid crystal display device, and the liquid crystal display device can be dehumidified while performing secondary air cooling; The reflective component 404 can separate the light sources on the circuit board 401 into independent light sources through the reflective cup 4042 thereon, and can divide the entire screen into multiple areas, so that the system can independently adjust and control the brightness of each area, and can synchronize the backlight with the display signal of the liquid crystal panel 3. When an area is completely white, the LED array in this area is all lit, and when an area is completely black, the LED array under this area is all turned off. The brightness of the LED array can be controlled in different areas, which can not only effectively reduce power consumption, but also avoid mutual influence between light sources, and improve image quality. In addition, the light emitted by the LED lamp group 403 can be fully reflected to the front of the backlight module 4 through the reflective cup 4042, which can improve the luminous efficiency and brightness. The reflective cup 4042 is integrally arranged on the reflective component 404, and can be installed at one time without the need to install them separately, which is convenient for installation and disassembly. In addition, the light emitted by the LED lamp group 403 can be reflected twice through the reflective bottom plate 4041 and the reflective side plate 4043 on the reflective component 404, which can further improve the luminous efficiency and brightness of the backlight module 4.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A liquid crystal display device, comprising an outer shell (1), an optical film assembly (2) and a liquid crystal panel (3) fixedly arranged at a light-emitting end of the outer shell (1), characterized in that: A backlight module (4) is fixedly installed in the inner cavity of the outer shell (1); a cooling cavity (5) is provided inside the outer shell (1) below the backlight module (4); a protective cover (6) and a coolant circulation delivery pipeline (7) are fixedly provided at the bottom end of the outer shell (1); a refrigeration mechanism (8) and a delivery pump group (9) are connected to the coolant circulation delivery pipeline (7); a linkage mechanism (10) is fixedly connected to one end of the delivery pump group (9); a cooling and dehumidifying mechanism (11) is connected to the end of the linkage mechanism (10); and guide plates (12) are fixedly provided at equal intervals in the inner cavity of the cooling cavity (5); The cooling and dehumidifying mechanism (11) comprises a hollow cylinder (1101) and a linkage plate (1102) connected to the end of the linkage mechanism (10); a push-pull rod (1103) is fixedly provided on one side of the linkage plate (1102); one end of the push-pull rod (1103) is fixedly connected to a piston assembly (1104); and the piston assembly (1104) is installed inside the hollow cylinder (1101); one end of the hollow cylinder (1101) is connected to an air intake pipe (1105) via a pipe fitting; an air intake branch pipe (1106) is equidistantly connected to the air intake pipe (1105); and the air intake pipe (1106) of the hollow cylinder (1101) is connected to the air intake pipe (1105). 5), a first non-return valve (1107) is provided on the pipe fitting connected between the hollow cylinder (1101) and the air blowing pipe (1108), an air blowing branch pipe (1109) is connected to the air blowing pipe (1108) at equal intervals, and one end of the air blowing branch pipe (1109) and one end of the air suction branch pipe (1106) are both arranged inside the outer shell (1), a drying component (1110) is connected to the pipe fitting connected between the air suction pipe (1105) and the air blowing pipe (1108), and a second non-return valve (1111) is provided on the pipe fitting connected between the hollow cylinder (1101) and the air blowing pipe (1108).

2. A liquid crystal display device according to claim 1, characterized in that: The guide plate (12) divides the inner cavity of the cooling cavity (5) into a serpentine structure.

3. A liquid crystal display device according to claim 1, characterized in that: The refrigeration mechanism (8) comprises a refrigeration liquid storage container (801) fixedly mounted on the backlight end of the outer shell (1); an air refrigeration container (802) is fixedly arranged outside the refrigeration liquid storage container (801); a semiconductor refrigeration component (803) is fixedly arranged outside the air refrigeration container (802); refrigeration fins (804) are fixedly arranged at equal distances on the refrigeration end of the semiconductor refrigeration component (803); and one end of the refrigeration fin (804) passes through the air refrigeration container (802) and is arranged inside the refrigeration liquid storage container (801); The air refrigeration container (802) is installed on the pipe fitting connecting the hollow cylinder (1101) and the air suction main pipe (1105).

4. A liquid crystal display device according to claim 3, characterized in that: The delivery pump assembly (9) comprises a pump body (901) which is connected to the coolant circulation delivery pipeline (7); a rotating motor (902) is fixedly mounted on one end of the pump body (901); an impeller assembly (903) is fixedly connected to the end of the output shaft of the rotating motor (902); and the impeller assembly (903) is rotatably mounted inside the pump body (901).

5. A liquid crystal display device according to claim 4, characterized in that: The linkage mechanism (10) comprises a connecting plate (1001) fixedly mounted on the outside of one end of a pump body (901) and a transmission gear (1002) fixedly connected to an impeller assembly (903) via a shaft, the outside of the connecting plate (1001) being rotatably connected to the linkage gear (1003) via a rotating shaft, a driving rod (1004) being eccentrically fixedly mounted on the surface of the linkage gear (1003), and the linkage plate (1102) being sleeved on the outside of one end of the driving rod (1004); The size of the linkage gear (1003) is larger than the size of the transmission gear (1002), and the linkage gear (1003) and the transmission gear (1002) are meshingly connected.

6. A liquid crystal display device according to claim 5, characterized in that: The drying component (1110) comprises a drying box body (11101) on a pipe connected between an air suction main pipe (1105) and an air blowing main pipe (1108), wherein cylindrical mesh sleeves (11102) are fixedly arranged at equal intervals inside the drying box body (11101), and the cylindrical mesh sleeves (11102) are filled with silica gel desiccant particles (11103).

7. A liquid crystal display device according to claim 1, characterized in that: The optical film set (2) consists of a lower diffusion plate, a brightness enhancement film, and an upper diffusion plate which are arranged in sequence from bottom to top, and the top surface of the brightness enhancement film is arranged as a prism structure.

8. A direct-type Local dimming backlight module, comprising the backlight module (4) as claimed in any one of claims 1 to 7, characterized in that: The backlight module (4) comprises a circuit board (401) fixedly mounted inside the outer shell (1); a connecting pillar (402) with a threaded hole and an LED light group (403) are fixedly provided on the top surface of the circuit board (401); a reflective component (404) is fixedly connected to the top of the connecting pillar (402) by means of screws, and the reflective component (404) is sleeved on the outside of the LED light group (403).

9. The direct-type local dimming backlight module according to claim 8, characterized in that: The LED lamp group (403) comprises an LED lamp mounting seat (4031) fixedly mounted on the top of the circuit board (401) and an LED lamp (4032) fixedly mounted on the top of the LED lamp mounting seat (4031); a positive electrode wiring pin (4033) and a negative electrode wiring pin (4034) are symmetrically arranged on the outer side of the LED lamp mounting seat (4031); a heat conducting rod (4035) is fixedly arranged at the bottom end of the LED lamp mounting seat (4031); and the bottom end of the heat conducting rod (4035) is inserted into the interior of the cooling cavity (5).

10. The direct-type local dimming backlight module according to claim 9, characterized in that: The reflective assembly (404) comprises a reflective bottom plate (4041) and a reflective cup (4042) equidistantly fixedly arranged on the top of the reflective bottom plate (4041), the LED lamp (4032) is inserted into the reflective cup (4042), and reflective side plates (4043) are symmetrically fixedly arranged on the outside of the reflective bottom plate (4041).

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