LED backlight source with local dynamic dimming function

Abstract

The invention relates to the technical field of backlight sources, in particular to a local dynamic dimming LED backlight source which comprises a mounting base, a light guide plate fixedly mounted on the upper end face of the mounting base, a shading frame fixedly arranged on the left side of the upper end face of the mounting base, and a heat dissipation auxiliary box fixedly arranged on the left end face of the shading frame. Two ventilation boxes are fixedly arranged on the front and rear end surfaces of the heat dissipation auxiliary box; after the lamp holder body is installed and the light source lamp is started, if a light guide dead angle appears, debugging air cylinders on the two adjacent sides of the dead angle can be remotely controlled to be started, so that the light source lamp is driven to move front and back, the light scattering angle of the light source lamp is changed, and the local dynamic dimming function can be achieved; and when dead angles occur, the dead angles can be quickly adjusted, normal work of light source lamps in other areas cannot be affected, and the adjusting and mounting work efficiency of the device is improved to a great extent.

Description

Technical Field

[0001] The invention relates to the technical field of backlight sources, and in particular to a local dynamic dimming LED backlight source. Background Art

[0002] The backlight is a light source located behind the liquid crystal display. Its luminous effect will directly affect the visual effect of the liquid crystal display module. The liquid crystal display itself does not emit light. It displays graphics or the result of its modulation of light. The backlight module usually uses LED light strips as the backlight light source. Correspondingly, the LED light strips used for the backlight module are also called LED backlight light sources. The core technology in the backlight source module is the optical technology of the light guide plate. The light emitted by the light source enters the light guide plate and encounters scattered light points in the light guide plate for diffuse reflection. The light directed to the bottom of the light guide plate is reflected by the reflector and emitted through the light guide plate to achieve the backlight effect.

[0003] During the installation of the backlight source, the backlight source is usually fixedly installed due to the sealing and dustproof requirements between the backlight source and the light guide plate. As a result, when the distance between the backlight source and the light guide plate is subsequently adjusted, complex circuit structure control needs to be added to achieve dimming, which has a high technical cost. If the installation is carried out normally, when a light guide blind spot occurs, the light guide plate and the backlight source body need to be disassembled to fine-tune the position of the backlight source. In addition, since the light source of the backlight source is often fixed and installed in parallel with a variety of lamp heads, the common external debugging structure cannot be adjusted and replaced individually, and a long working time is required for debugging. Summary of the invention

[0004] The object of the present invention is to provide a local dynamic dimming LED backlight source to overcome the above-mentioned defects in the prior art.

[0005] According to the present invention, a local dynamic dimming LED backlight source comprises a mounting base, a light guide plate is fixedly mounted on the upper end surface of the mounting base, a light shielding frame is fixedly mounted on the left side of the upper end surface of the mounting base, a heat dissipation auxiliary box is fixedly mounted on the left end surface of the light shielding frame, and two ventilation boxes are fixedly mounted on the front and rear end surfaces of the heat dissipation auxiliary box;

[0006] A light guide cavity is provided in the shading frame, a plurality of lamp holder bodies are fixedly provided on the left wall of the light guide cavity, a storage outer cavity is provided in the heat dissipation auxiliary box, a ventilation inner box is fixedly provided on the right wall of the storage outer cavity, a ventilation main cavity is provided in the ventilation inner box, five air guide inner frames are fixedly provided in the ventilation inner box, a variable air cavity connected to the left and right is provided in the air guide inner frame, five replacement mounting frames are fixedly provided on the upper end surface of the shading frame, a mounting outer frame is fixedly provided on the lower end surface of the replacement mounting frame, the lower end surface of the mounting outer frame extends into the light guide cavity and is fixedly connected to the right end surface of the lamp holder body, a light diffusion cavity is provided in the lamp holder body, a light diffusion cavity is provided in the light diffusion cavity, a light source lamp that moves left and right is provided in the light diffusion cavity.

[0007] In some embodiments, a power connection inner frame is fixedly provided on the upper end surface of the lamp holder body. Two electrical interfaces are symmetrically and fixedly provided on the front and rear of the upper end surface of the mounting base. The upper end surface of the electrical interface is electrically connected to an external power supply device. Each power connection inner frame is electrically connected to the front and rear end surfaces of the electrical interface. An installation top plate is fixedly installed on the upper end surface of the mounting base. The light guide cavity and the installation top plate are both fixedly connected to the mounting base or the light shielding frame by screw connections.

[0008] In some embodiments, a transverse movement frame capable of moving back and forth is provided on the lower wall of the light scattering cavity. The upper end surface of the transverse movement frame is fixedly connected to the lower end surface of the light source lamp. Two debugging cylinders are symmetrically and fixedly provided on the front and rear of the left end surface of the installation outer frame. The front end surface of the debugging cylinder can perform telescopic movement and is fixedly connected to the right end surface of the transverse movement frame. When the debugging cylinder is started, it can drive the transverse movement frame to move left and right, and then drive the light scattering cavity to move left and right.

[0009] In some embodiments, a debugging module is fixedly provided on the left wall of the light scattering cavity. The upper end surface of the debugging module is electrically connected to the lower end surface of the power connection inner frame on the same side and the left end surface of the light source lamp. The length of the connecting wire between the left end surface of the light source lamp and the right end surface of the debugging module can meet the sliding length requirement of the light source lamp.

[0010] In some embodiments, a wind guiding plate capable of moving back and forth is provided in the variable wind cavity. A temperature detector is fixedly provided on the rear end surface of the debugging module. The temperature detector can detect the temperature when the debugging module is working. A top movement shaft is rotatably provided on the upper end surface of the wind guiding inner frame. The upper end surface of the wind guiding plate is threadedly connected to the outer circular surface of the top movement shaft. A transverse movement motor is fixedly provided on the left side of the upper end surface of the variable wind cavity. The left end surface of the top movement shaft is power-connected to the transverse movement motor.

[0011] In some embodiments, a ventilation bottom cavity is provided on the lower wall of the ventilation main cavity. Five through holes are provided on the upper wall of the ventilation bottom cavity at the right side of the wind guiding inner frame. A ventilation outer cavity is provided in the ventilation box. A side filter plate is fixedly provided on the side wall close to the center of the ventilation outer cavity. A bottom filter plate is fixedly provided on the lower wall of the ventilation outer cavity. Both the bottom filter plate and the side filter plate can perform filtering work. A rotating fan is rotatably provided in the front ventilation box. A ventilation motor is fixedly provided on the left end surface of the front ventilation box. The left end surface of the rotating fan is power-connected to the ventilation motor.

[0012] In some embodiments, installation pieces are fixedly provided on the upper and lower end surfaces of the light guide plate. A control panel is fixedly provided on the left end surface of the heat dissipation auxiliary box. The control panel can control the start and stop of all motors and cylinders of the present invention.

[0013] Compared with the prior art, the advantages of the present invention are as follows:

[0014] 1. After the lamp holder body is installed, by starting the light source lamp, if there is a light guide dead angle, the debugging cylinders on both sides adjacent to the dead angle can be remotely controlled to start, so as to drive the light source lamp to move back and forth, thereby changing the light scattering angle of the light source lamp, and thus realizing the local dynamic dimming function. When a dead angle appears, it can be quickly adjusted without affecting the normal operation of the light source lamps in other areas, greatly improving the adjustment and installation work efficiency of the present invention.

[0015] 2. By fixing the replacement mounting frame and the mounting top plate to the upper end face of the present invention respectively, it plays a protective role. When the lamp holder body with faults needs to be replaced subsequently, after disassembling the connection between the mounting top plate, the screws of the replacement mounting frame and the power connection inner frame, by lifting the replacement mounting frame on the same side, the lamp holder body in the light guide cavity can be taken out together with the mounting outer frame, making the present invention have the characteristics of portable installation and separate replacement, and can effectively reduce the subsequent maintenance and component replacement costs.

[0016] 3. By making the air guide plate start to move leftward, and finally after the air guide plate completely enters the variable air cavity, the gas flow directions in the variable air cavity and the main ventilation cavity are changed. When most of the gas flows to the surface of the variable air cavity, it will flow to the right under the limitation of the variable air cavity, so as to be closer to the debugging module and further absorb the heat generated by the debugging module. The remaining air will also continuously flow through the main ventilation cavity and the bottom ventilation cavity to other variable air cavities, so as to ensure the heat dissipation effect of all debugging modules while realizing single-point enhanced heat dissipation work, and thus ensure the safety performance when the present invention works. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the front view of the present invention;

[0018] Figure 2 is the left view of the present invention;

[0019] Figure 3 is the present invention Figure 2 the schematic structural diagram of the heat dissipation auxiliary box 18 component in the present invention;

[0020] Figure 4 is the schematic structural diagram of the overall structure of a locally dynamically dimmable LED backlight source of the present invention;

[0021] Figure 5 is the present invention Figure 4 the schematic structural diagram of the mounting outer frame 36 component in the present invention;

[0022] Figure 6 is the present invention Figure 5Schematic diagram of the structure at the component of the middle light source lamp 35;

[0023] Figure 7 This is the present invention Figure 4 Schematic diagram of the structure at the component of the middle air guide plate 29.

[0024] In the figure:

[0025] 11. Installation base; 12. Light shielding frame; 13. Electrical interface; 14. Ventilation box; 15. Ventilation motor; 16. Ventilation outer cavity; 17. Rotating fan; 18. Heat dissipation auxiliary box; 19. Installation top plate; 20. Replacement installation frame; 21. Light guide cavity; 22. Temperature detector; 23. Installation piece; 24. Light guide plate; 25. Control panel; 26. Ventilation bottom cavity; 27. Ventilation main cavity; 28. Ventilation inner box; 29. Air guide plate; 30. Variable wind cavity; 31. Top moving shaft; 32. Bottom filter plate; 33. Side filter plate; 34. Diffusion cavity; 35. Light source lamp; 36. Installation outer frame; 37. Lamp holder body; 38. Debugging cylinder; 39. Storage outer cavity; 40. Air guide inner frame; 41. Transverse movement motor; 42. Debugging module; 43. Power connection inner frame; 44. Transverse movement frame. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1

[0028] Refer to Figures 1 - 7 , which is the first embodiment of the present invention. This embodiment provides an embodiment of a locally dynamically dimmable LED backlight, including an installation base 11, a light guide plate 24 is fixedly installed on the upper end surface of the installation base 11, a light shielding frame 12 is fixedly provided on the left side of the upper end surface of the installation base 11, a heat dissipation auxiliary box 18 is fixedly provided on the left end surface of the light shielding frame 12, and two ventilation boxes 14 are fixedly provided on the front and rear end surfaces of the heat dissipation auxiliary box 18;

[0029] The light-shielding frame 12 is provided with a light guide cavity 21. Multiple lamp holder bodies 37 are fixedly arranged on the left wall of the light guide cavity 21. The heat dissipation auxiliary box 18 is provided with a storage outer cavity 39. A ventilation inner box 28 is fixedly arranged on the right wall of the storage outer cavity 39. The ventilation inner box 28 is provided with a ventilation main cavity 27. Five air guide inner frames 40 are fixedly arranged in the ventilation inner box 28. The air guide inner frames 40 are provided with a variable air cavity 30 that is connected left and right. Five replacement mounting frames 20 are fixedly arranged on the upper end surface of the light-shielding frame 12. The lower end surface of the replacement mounting frame 20 is fixedly provided with a mounting outer frame 36. The lower end surface of the mounting outer frame 36 extends into the light guide cavity 21 and is fixedly connected to the right end surface of the lamp holder body 37. The lamp holder body 37 is provided with a light scattering cavity 34. A light source lamp 35 that can move left and right is arranged in the light scattering cavity 34.

[0030] The upper end surface of the lamp holder body 37 is fixedly provided with a power connection inner frame 43. Two electrical interfaces 13 are symmetrically and fixedly arranged on the front and rear of the upper end surface of the mounting base 11. The upper end surface of the electrical interface 13 is electrically connected to an external power supply device. Each power connection inner frame 43 is electrically connected to the front and rear end surfaces of the electrical interface 13. The upper end surface of the mounting base 11 is fixedly installed with a mounting top plate 19. The light guide cavity 21 and the mounting top plate 19 are both fixedly connected to the mounting base 11 or the light-shielding frame 12 by screw connection.

[0031] The lower wall of the light scattering cavity 34 is provided with a transverse moving frame 44 that can move back and forth. The upper end surface of the transverse moving frame 44 is fixedly connected to the lower end surface of the light source lamp 35. Two debugging cylinders 38 are symmetrically and fixedly arranged on the front and rear of the left end surface of the mounting outer frame 36. The front end surface of the debugging cylinder 38 can perform telescopic movement and is fixedly connected to the right end surface of the transverse moving frame 44. When the debugging cylinder 38 is started, it can drive the transverse moving frame 44 to move left and right, and then drive the light scattering cavity 34 to move left and right.

[0032] A debugging module 42 is fixedly arranged on the left wall of the light scattering cavity 34. The upper end surface of the debugging module 42 is electrically connected to the lower end surface of the power connection inner frame 43 on the same side and the left end surface of the light source lamp 35. The length of the connecting wire between the left end surface of the light source lamp 35 and the right end surface of the debugging module 42 can meet the sliding length requirement of the light source lamp 35.

[0033] After the lamp holder body 37 is installed, after the light source lamp 35 is started, if there is a light guide dead angle, the debugging cylinders 38 on both sides adjacent to the dead angle can be started remotely, so as to drive the light source lamp 35 to move back and forth, thereby changing the light scattering angle of the light source lamp 35, so as to realize the local dynamic dimming function, and can quickly adjust it when there is a dead angle, and will not affect the normal operation of the light source lamps 35 in other areas, greatly improving the adjustment and installation work efficiency of the present invention.

[0034] Example 2

[0035] Refer to Figures 1 - 7 To prevent the temperature of the lamp holder body 37 from being too high during operation, improve the heat dissipation performance of the present invention, and quickly cool a single high-temperature module, a wind guide plate 29 and a temperature detector 22 are provided;

[0036] A wind guide plate 29 capable of moving back and forth is provided in the variable wind cavity 30. A temperature detector 22 is fixedly provided on the rear end surface of the debugging module 42. The temperature detector 22 can detect the temperature of the debugging module 42 during operation. A top moving shaft 31 is rotatably provided on the upper end surface of the inner wind guide frame 40. A threaded connection is adopted between the upper end surface of the wind guide plate 29 and the outer cylindrical surface of the top moving shaft 31. A transverse movement motor 41 is fixedly provided on the left side of the upper end surface of the variable wind cavity 30. The left end surface of the top moving shaft 31 is power-connected to the transverse movement motor 41. When the transverse movement motor 41 is started, it drives the top moving shaft 31 to rotate, thereby being able to drive the wind guide plate 29 to move left and right, changing the flow direction of the variable wind cavity 30.

[0037] A ventilation bottom cavity 26 is provided on the lower wall of the main ventilation cavity 27. There are a total of five through holes on the upper wall of the ventilation bottom cavity 26 on the right side of the inner wind guide frame 40. A ventilation outer cavity 16 is provided in the ventilation box 14. A side filter plate 33 is fixedly provided on the side wall close to the center of the ventilation outer cavity 16. A bottom filter plate 32 is fixedly provided on the lower wall of the ventilation outer cavity 16. Both the bottom filter plate 32 and the side filter plate 33 can perform filtering work. A rotating fan 17 is rotatably provided in the front ventilation box 14. A ventilation motor 15 is fixedly provided on the left end surface of the front ventilation box 14. The left end surface of the rotating fan 17 is power-connected to the ventilation motor 15. When the ventilation motor 15 is started, it drives the rotating fan 17 to rotate, thereby enabling the outside air to enter the ventilation outer cavity 16.

[0038] Mounting pieces 23 are fixedly provided on the upper and lower end surfaces of the light guide plate 24. A control panel 25 is fixedly provided on the left end surface of the heat dissipation auxiliary box 18. The control panel 25 can control the start and stop of all motors and cylinders of the present invention.

[0039] After the air deflector 29 completely enters the variable air chamber 30, the present invention changes the gas flow directions in the variable air chamber 30 and the main ventilation chamber 27, so that most of the gas will flow to the right under the limitation of the variable air chamber 30 after flowing to the surface of the variable air chamber 30, thereby being able to get closer to the debugging module 42 and further absorbing the heat generated by the debugging module 42. The remaining air will also continuously flow to other variable air chambers 30 through the main ventilation chamber 27 and the bottom ventilation chamber 26, so that while ensuring the heat dissipation effect of all the debugging modules 42, single-point enhanced heat dissipation work can also be achieved, thereby ensuring the safety performance when the present invention works.

[0040] Specific working process:

[0041] When performing the LED backlight installation work, after the light guide plate 24 and the mounting piece 23 are fixedly installed, the mounting top plate 19 can be disassembled from the replacement mounting frame 20. The lamp holder body 37 together with the mounting outer frame 36 is installed on the left wall of the light guide cavity 21. After electrically connecting the multiple power connection inner frames 43 and the electrical interfaces 13 to each other, the mounting top plate 19 and the replacement mounting frame 20 are fixedly installed by screws, so that the replacement mounting frame 20 and the mounting top plate 19 are respectively fixed on the upper end surface of the present invention to play a protective role. When the lamp holder body 37 with a fault needs to be replaced subsequently, after disassembling the connections between the screws of the mounting top plate 19 and the replacement mounting frame 20 and the power connection inner frame 43, by lifting the replacement mounting frame 20 on the same side, the lamp holder body 37 in the light guide cavity 21 together with the mounting outer frame 36 can be taken out, making the present invention have the characteristics of portable installation and individual replacement, and being able to effectively reduce the subsequent maintenance and component replacement costs.

[0042] After the lamp holder body 37 is installed, after the light source lamp 35 is started, if there is a light guide dead angle, the debugging cylinders 38 on both sides adjacent to the dead angle can be remotely controlled to start, thereby driving the light source lamp 35 to move back and forth, so as to change the light scattering angle of the light source lamp 35, thereby being able to realize the local dynamic dimming function, quickly adjust it when there is a dead angle, and not affecting the normal operation of the light source lamps 35 in other areas, greatly improving the adjustment and installation work efficiency of the present invention.

[0043] When the light source lamp 35 is working properly, the ventilation motor 15 can be started to drive the rotating fan 17 to rotate, thereby driving the outside air to enter the ventilation bottom cavity 26 or the ventilation main cavity 27 after being filtered by the bottom filter plate 32 or the side filter plate 33. If the temperature of the debugging module 42 continues to rise, the abnormal signal will be detected by the temperature detector 22 and the lateral movement motor 41 on the same side will be controlled to start, so that the top moving shaft 31 rotates, and then drives the air guide plate 29 in the storage outer cavity 39 to start moving to the left. Finally, after the air guide plate 29 completely enters the variable air cavity 30, the gas flow direction in the variable air cavity 30 and the ventilation main cavity 27 is changed. When most of the gas flows to the surface of the variable air cavity 30, it will flow to the right under the limit of the variable air cavity 30, so that it can be closer to the debugging module 42 and further absorb the heat generated by the debugging module 42. The remaining air will also continuously flow through the ventilation main cavity 27 and the ventilation bottom cavity 26 to other variable air cavities 30, so that while ensuring the heat dissipation effect of all debugging modules 42, single-point enhanced heat dissipation work can also be realized, thus ensuring the safety performance of the present invention during operation.

[0044] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. An LED backlight source with local dynamic dimming, comprising a mounting base (11), characterized in that: A light guide plate (24) is fixedly installed on the upper end surface of the installation base (11). A light-shielding frame (12) is fixedly provided on the left side of the upper end surface of the installation base (11). A heat dissipation auxiliary box (18) is fixedly provided on the left end surface of the light-shielding frame (12). Two ventilation boxes (14) are fixedly provided on the front and rear end surfaces of the heat dissipation auxiliary box (18). A light guide cavity (21) is provided in the light-shielding frame (12). A plurality of lamp holder bodies (37) are fixedly provided on the left wall of the light guide cavity (21). A storage outer cavity (39) is provided in the heat dissipation auxiliary box (18). A ventilation inner box (28) is fixedly provided on the right wall of the storage outer cavity (39). A ventilation main cavity (27) is provided in the ventilation inner box (28). Five air guide inner frames (40) are fixedly provided in the ventilation inner box (28). A variable air cavity (30) communicating left and right is provided in the air guide inner frame (40). Five replacement mounting frames (20) are fixedly provided on the upper end surface of the light-shielding frame (12). An installation outer frame (36) is fixedly provided on the lower end surface of the replacement mounting frame (20). The lower end surface of the installation outer frame (36) extends into the light guide cavity (21) and is fixedly connected to the right end surface of the lamp holder body (37). A light scattering cavity (34) is provided in the lamp holder body (37). A light source lamp (35) that can move left and right is provided in the light scattering cavity (34).

2. The LED backlight source with local dynamic dimming according to claim 1, wherein: A power connection inner frame (43) is fixedly provided on the upper end surface of the lamp holder body (37). Two electrical interfaces (13) are symmetrically and fixedly provided on the front and rear of the upper end surface of the installation base (11). An installation top plate (19) is fixedly installed on the upper end surface of the installation base (11). Both the light guide cavity (21) and the installation top plate (19) are fixedly connected by threaded connections between the installation base (11) or the light-shielding frame (12).

3. The LED backlight with local dynamic dimming according to claim 1, wherein: A transverse movement frame (44) that can move back and forth is provided on the lower wall of the light scattering cavity (34). The upper end surface of the transverse movement frame (44) is fixedly connected to the lower end surface of the light source lamp (35). Two debugging cylinders (38) are symmetrically and fixedly provided on the front and rear of the left end surface of the installation outer frame (36). The front end surface of the debugging cylinder (38) can perform telescopic movement and is fixedly connected to the right end surface of the transverse movement frame (44).

4. The LED backlight source with local dynamic dimming according to claim 2, characterized in that: A debugging module (42) is fixedly provided on the left wall of the light scattering cavity (34). The upper end surface of the debugging module (42) is electrically connected between the lower end surface of the power connection inner frame (43) on the same side and the left end surface of the light source lamp (35).

5. The LED backlight with local dynamic dimming according to claim 4, characterized in that: An air guide plate (29) that can move back and forth is provided in the variable air cavity (30). A temperature detector (22) is fixedly provided on the rear end surface of the debugging module (42). A top movement shaft (31) is rotatably provided on the upper end surface of the air guide inner frame (40). The upper end surface of the air guide plate (29) is threadedly connected to the outer circular surface of the top movement shaft (31). A transverse movement motor (41) is fixedly provided on the left side of the upper end surface of the variable air cavity (30). The left end surface of the top movement shaft (31) is power-connected to the transverse movement motor (41).

6. The LED backlight with local dynamic dimming according to claim 1, characterized in that: The lower wall of the main ventilation chamber (27) is provided with a ventilation bottom chamber (26). There are a total of five through openings on the upper wall of the ventilation bottom chamber (26) on the right side of the inner air guide frame (40). A ventilation outer chamber (16) is provided inside the ventilation box (14). A side filter plate (33) is fixedly provided on the side wall close to the center of the ventilation outer chamber (16). A bottom filter plate (32) is fixedly provided on the lower wall of the ventilation outer chamber (16). A rotating fan (17) is rotatably provided in the front ventilation box (14). A ventilation motor (15) is fixedly provided on the left end face of the front ventilation box (14). The left end face of the rotating fan (17) is power-connected to the ventilation motor (15).

7. The LED backlight source with local dynamic dimming according to claim 1, wherein: Mounting pieces (23) are fixedly provided on the upper and lower end faces of the light guide plate (24). A control panel (25) is fixedly provided on the left end face of the heat dissipation auxiliary box (18).

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