A reflective optical structure for LED backlighting

Abstract

This invention provides a reflective optical structure for LED backlighting, relating to the field of LED backlighting technology. It includes a backlight frame and a backplate disposed inside the bottom of the backlight frame. A reflective sheet is adhered and fixed to the outer wall of the top of the backplate, reflecting the light source acting on its upper surface upwards. This invention makes the backplate at the bottom of the backlight frame movable and adds a novel distance fine-tuning device, improving practicality and adaptability. Through the cooperation of a fine-tuning screw and an internal threaded sleeve, and guided by a movable stabilizing guide rod, it achieves precise adjustment of the spacing between core components, driving the backplate, reflective sheet, and light guide plate to move stably, optimizing light effects and improving luminous quality. A cross-shaped fixing bracket and an outer frame provide support, enhancing stability. An anti-detachment structure prevents components from falling off and being damaged by over-adjustment. The device improves adaptability and maintainability, adapting to different LCD panels, reducing maintenance costs, and also improving light utilization, brightness, and energy efficiency.

Description

Technical Field

[0001] This utility model relates to the field of LED backlight technology, and in particular to a reflective optical structure for LED backlight. Background Technology

[0002] With the rapid development of display technology, LED backlighting, with its low energy consumption, long lifespan, high brightness, and excellent color performance, has been widely used in various display devices such as LCD monitors, televisions, and laptops. Among them, the reflective optical structure, as the core component of the LED backlighting system, directly affects the uniformity of the backlight, the light utilization rate, and the overall display effect due to its rational design.

[0003] However, in practical applications, traditional LED backlight reflective optical structures often suffer from unavoidable dimensional deviations during manufacturing and operational errors during installation. This results in unsatisfactory relative distances between the light guide plate and the LED light source chips on the PCB light strip, and between the light guide plate and the reflector. These distance deviations lead to poor light transmission and reflection within the light guide plate, causing uneven brightness in the backlight area, resulting in localized dark or bright spots. More seriously, they reduce light utilization, affecting the overall brightness and energy efficiency of the display device. Furthermore, the positions of core components such as the backplate, reflector, and light guide plate in traditional structures are mostly fixed and cannot be adjusted according to actual needs. When dealing with LCD panels of different specifications, the fixed component spacing cannot meet diverse backlight requirements due to differences in adaptation requirements, resulting in poor structural adaptability. Simultaneously, during long-term use, components are prone to positional shifts due to temperature changes and vibrations. The fixed structure lacks effective adjustment methods, making subsequent maintenance difficult and requiring significant manpower and time for disassembly and reassembly. This not only affects the normal use of the equipment but may also cause additional damage to components due to repeated disassembly. Utility Model Content

[0004] Therefore, it is necessary to provide a reflective optical structure for LED backlighting to address the problems of uneven backlighting and low luminous efficiency caused by production and installation errors, difficulty in meeting the distance between the light guide plate and LED and the reflective sheet, poor adaptability, easy displacement and maintenance after long-term use, and labor-intensive disassembly and assembly and easy damage to parts in traditional reflective optical structures used for LED backlighting.

[0005] This utility model provides a reflective optical structure for LED backlighting, including a backlight frame and a back plate disposed inside the bottom of the backlight frame. A reflective sheet is attached to the outer wall of the top of the back plate, which can reflect the light source acting on its upper surface upward. Transparent adhesive strips are attached to the outer wall of the top of the reflective sheet near both the left and right ends. A light guide plate is attached to the top of the two transparent adhesive strips. PCB light strips are disposed on both the left and right sides of the light guide plate. Multiple LED light source chips are disposed at equal intervals on the two PCB light strips. A distance fine-tuning device is connected between the backlight frame and the bottom of the back plate.

[0006] In one embodiment, the distance fine-tuning device includes movable stabilizing guide holes, an outer frame, movable stabilizing guide rods, and a cross-shaped fixing bracket. The back plate is movable inside the bottom end of the backlight frame. An outer frame is provided at the bottom end of the backlight frame. A cross-shaped fixing bracket is provided inside the bottom end of the outer frame. The left and right ends and the front and rear ends of the cross-shaped fixing bracket are fixedly connected to the inner walls of the left and right ends and the front and rear ends of the outer frame, respectively. Movable stabilizing guide holes are provided near the left and right ends and the front and rear ends of the cross-shaped fixing bracket. Movable stabilizing guide rods are vertically fixed on the left and right sides and the front and rear sides at the center of the outer wall at the bottom end of the back plate. The bottom ends of the four movable stabilizing guide rods pass through the movable stabilizing guide holes corresponding to their positions.

[0007] In one embodiment, the outer frame is flush with the outer and inner walls of the backlight frame, the vertical height of the outer frame is less than the vertical height of the backlight frame, the thickness of the cross-shaped fixing bracket is less than half the height of the outer frame, and the movable stabilizing guide rod can move up and down in the movable stabilizing guide hole.

[0008] In one embodiment, the distance fine-tuning device further includes a fine-tuning screw, an internal threaded sleeve, a plug-in hole, and a flat anti-loosening nut. The plug-in hole is provided inside the center of the cross-shaped fixing frame, and the internal threaded sleeve is inserted into the plug-in hole. Flat anti-loosening nuts are sleeved and fixed on the upper and lower ends of the internal threaded sleeve. The two flat anti-loosening nuts are located at the top and bottom ends of the cross-shaped fixing frame, respectively. The fine-tuning screw is vertically fixed at the center of the bottom end of the back plate, and the fine-tuning screw is threaded into the internal threaded sleeve.

[0009] In one embodiment, the internal threaded sleeve and the two flat anti-loosening nuts form an I-shaped anti-loosening structure, that is, the internal threaded sleeve can rotate clockwise and counterclockwise in the insertion hole, while the two flat anti-loosening nuts can prevent the internal threaded sleeve from moving up and down during rotation.

[0010] In one embodiment, the clockwise and counterclockwise rotation of the internal threaded sleeve can drive the fine-tuning screw to move up and down through the thread action, and the fine-tuning screw can drive the back plate, reflector and light guide plate connected by transparent adhesive strip to move up and down.

[0011] In one embodiment, the light emitted by the multiple LED light source chips on the PCB light strip is guided into the light guide plate, and the reflector can reflect the light upward below the light guide plate. The top of each of the two PCB light strips is fixed with a light shielding strip, which can prevent the light emitted by the LED light source chips from shining directly upward.

[0012] In one embodiment, the top ends of the two light-shielding strips are connected to a diffuser plate, and a diffuser film is pasted on the outer wall of the top end of the diffuser plate. The thickness of the diffuser film is less than the thickness of the diffuser plate, and there are no air bubbles between the diffuser film and the diffuser plate. Both the diffuser film and the diffuser plate are located inside the frame of the backlight frame.

[0013] In one embodiment, an LCD panel is disposed above the diffusion film, and the LCD panel does not contact the diffusion film. The LCD panel is sealed and fixed inside the opening at the top of the backlight frame.

[0014] In one embodiment, mounting strips are welded to the outer walls of both the left and right ends of the backlight frame. The two mounting strips are flush with the bottom outer wall of the backlight frame, and multiple screw holes are provided inside the two mounting strips.

[0015] In one embodiment, mounting screws can be directly inserted into the screw slots. After the mounting strip is fitted to the installation position, the mounting strip can be directly fixed at the installation position by the mounting screws inside the multiple screw slots.

[0016] The technical solution of this utility model improves the backplate inside the bottom of the backlight frame by making it movable, and adds a new distance fine-tuning device to the bottom of the backlight frame and the backplate. This distance fine-tuning device enhances the practicality and adaptability of the LED backlight's reflective optical structure. Through the threaded engagement of the fine-tuning screw and the inner threaded sleeve, and the guiding action of the movable stabilizing guide rod in the movable stabilizing guide hole, it achieves precise adjustment of the spacing between core components. This allows the backplate, reflector, and light guide plate to move stably up and down, accurately changing the spacing between the light guide plate and the LED light source chip and reflector on the PCB light strip, optimizing light transmission and reflection effects, making the light distribution more uniform, and improving the overall light emission quality. Simultaneously, the fixed connection between the cross-shaped fixing bracket and the outer frame provides solid support, and the cooperation between the movable stabilizing guide rod and the movable stabilizing guide hole enhances the stability and adaptability of the structure during adjustment. The device ensures reliability, preventing component misalignment and wobbling, and reducing light leakage and uneven reflection. The I-shaped anti-loosening structure formed by the internal threaded sleeve and two flat anti-loosening nuts has excellent anti-loosening and limiting functions, ensuring that the internal threaded sleeve can rotate freely without moving up and down, avoiding the risk of falling off. The size matching between the external frame and the backlight frame also prevents damage to components due to excessive adjustment. In addition, the device improves the adaptability and maintainability of the structure. It can be finely adjusted to adapt to different specifications of LCD panels, and can cope with minor dimensional deviations in production and installation. In later maintenance, it can quickly solve backlight problems caused by component aging and positional misalignment, reducing maintenance difficulty and cost. Furthermore, by adjusting the distance of related components, the reflector reflects light more efficiently, reducing light loss below the light guide plate, allowing the light from the LED light source chip to be more fully introduced into the light guide plate, optimizing light utilization efficiency, and enhancing the brightness and energy efficiency of the LED backlight. Attached Figure Description

[0017] Figure 1 This is an exploded three-dimensional disassembly diagram of a reflective optical structure for LED backlighting according to the present invention.

[0018] Figure 2 This is a three-dimensional structural diagram of the assembled reflective optical structure for LED backlight according to the present invention.

[0019] Figure 3 This is a partial cross-sectional view of the assembled reflective optical structure for LED backlight according to the present invention.

[0020] Figure 4 This is a three-dimensional structural diagram of the distance fine-tuning device of this utility model, viewed from below.

[0021] Figure 5 This is a top-view disassembly diagram of the distance fine-tuning device of this utility model.

[0022] The attached diagram lists the components represented by each number as follows:

[0023] 1. Backlight frame; 2. Backplate; 3. Distance fine-tuning device; 4. Reflector; 5. PCB LED strip; 6. Light shield; 7. LED light source chip; 8. Light guide plate; 9. Diffuser plate; 10. Diffuser film; 11. LCD panel; 12. Transparent adhesive strip; 13. Screw hole; 14. Mounting strip; 15. Movable stabilizing guide hole; 16. External frame; 17. Movable stabilizing guide rod; 18. Fine-tuning screw; 19. Cross-shaped fixing bracket; 20. Internal threaded sleeve; 21. Insertion hole; 22. Flat anti-loosening nut. Detailed Implementation

[0024] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described clearly and completely below with reference to the accompanying drawings. Obviously, the specific details described below are only a part of the embodiments of this utility model, and this utility model can be implemented in many other embodiments different from those described herein. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0027] Please refer to Figure 1-5This invention provides a reflective optical structure for LED backlighting. The backlight frame 1 serves as the overall support structure, with a movable backplate 2 located inside its bottom. This movable design provides a basis for subsequent adjustments, facilitating optimization of the internal component fit according to requirements. A reflective sheet 4 is adhered and fixed to the top outer wall of the backplate 2. The reflective sheet 4 reflects the light source acting on its upper surface upwards, effectively reducing light loss below and significantly improving light utilization. Transparent adhesive strips 12 are adhered to the top outer wall of the reflective sheet 4 near both the left and right ends. A light guide plate 8 is adhered and fixed to the top of the two transparent adhesive strips 12. The transparent adhesive strips 12 not only connect the reflective sheet 4 to the light guide plate 8... The light guide plate 8 has a stable connection, and due to its transparent properties, it does not obstruct the propagation of light, ensuring smooth light transmission. PCB light strips 5 are set on both the left and right sides of the light guide plate 8, and multiple LED light source chips 7 are set on each of the two PCB light strips 5 at equal intervals. This symmetrical and equidistant layout makes the light source distribution more uniform, providing stable and balanced incident light for the light guide plate 8. The light emitted by the multiple LED light source chips 7 on the PCB light strips 5 is guided into the light guide plate 8. The light guide plate 8 can efficiently conduct and diffuse the light, ensuring that the light is evenly distributed inside it. Meanwhile, the reflector 4 below the light guide plate 8 reflects the light upwards, further enhancing the light intensity inside the light guide plate 8.

[0028] like Figure 1 , Figure 2 and Figure 3 As shown, each of the two PCB light strips 5 has a light-shielding strip 6 fixed to its top. The light-shielding strip 6 prevents the light emitted by the LED light source chip 7 from shining directly upwards, avoiding the problem of local bright spots caused by direct light and ensuring the uniformity of the backlight effect. The tops of the two light-shielding strips 6 are connected to a diffuser plate 9, which can perform preliminary light uniformization treatment to make the light softer. A diffuser film 10 is pasted on the outer wall of the top of the diffuser plate 9. The thickness of the diffuser film 10 is less than the thickness of the diffuser plate 9, and there are no air bubbles between the diffuser film 10 and the diffuser plate 9. This air bubble-free and tight fit ensures that the light can pass through smoothly, further improving the light uniformity effect and making the light... The light distribution is more uniform and delicate. Both the diffusion film 10 and the diffusion plate 9 are located inside the backlight frame 1. The backlight frame 1 provides them with a stable installation space and avoids interference from external factors. An LCD panel 11 is set above the diffusion film 10, and the LCD panel 11 does not contact the diffusion film 10. This non-contact design prevents the diffusion film 10 from wearing down the LCD panel 11, and also avoids the problem of light blocking caused by contact. The LCD panel 11 is sealed and fixed inside the top opening of the backlight frame 1. The sealing and fixing method not only ensures the stability of the LCD panel 11, but also effectively prevents dust and moisture, and extends the service life of the equipment.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, mounting strips 14 are welded to the outer walls of both ends of the backlight frame 1. The two mounting strips 14 are flush with the bottom outer wall of the backlight frame 1. This flush design makes the overall structure more stable during installation. Each mounting strip 14 has multiple screw holes 13 inside, into which mounting screws can be directly inserted. After the mounting strip 14 is fitted to the installation position, it can be directly fixed in place by the mounting screws inside the multiple screw holes 13. The multiple screw holes 13 make the installation more secure and reliable, adaptable to different installation environments, and improve the convenience and stability of installation. This reflective optical structure for LED backlighting achieves [the desired effect] by rationally arranging the core components inside the backlight frame 1. The efficient conduction, reflection, and utilization of LED light sources provide a uniform and stable backlight effect. Specifically, the light emitted by multiple LED light source chips 7 on the PCB light strip 5 is guided into the light guide plate 8. The light guide plate 8 is responsible for conducting and diffusing the light. The reflective sheet 4 below the light guide plate 8 can reflect the downward-diffusing light upward, reducing light loss and improving light utilization. The diffuser plate 9 and diffuser film 10 arranged sequentially above the light guide plate 8 further homogenize the light, making the light softer and more uniform, ultimately providing high-quality backlight for the LCD panel 11 above. At the same time, the light shield 6 can effectively prevent the light from the LED light source chips 7 from shining directly upward, avoiding problems such as local overbrightness and ensuring the consistency of the backlight effect.

[0030] like Figure 1 , Figure 4 and Figure 5As shown, a distance fine-tuning device 3 is connected to the bottom of the backlight frame 1 and the back plate 2. The distance fine-tuning device 3 includes movable stabilizing guide holes 15, an outer frame 16, movable stabilizing guide rods 17, and a cross-shaped fixing bracket 19. The back plate 2 is movable inside the bottom of the backlight frame 1. The bottom of the backlight frame 1 is provided with an outer frame 16. The bottom of the outer frame 16 is provided with a cross-shaped fixing bracket 19. The left and right ends and the front and rear ends of the cross-shaped fixing bracket 19 are fixedly connected to the inner walls of the left and right ends and the front and rear ends of the outer frame 16, respectively. Movable stabilizing guide holes 15 are provided inside the cross-shaped fixing bracket 19 near the left and right ends and the front and rear ends. Movable stabilizing guide rods 17 are vertically fixed on the left and right sides and the front and rear sides at the center of the bottom outer wall of the back plate 2. The bottom ends of the four movable stabilizing guide rods 17 pass through the holes corresponding to their positions. The movable stabilizing guide hole 15 and the outer frame 16 are flush with the outer and inner walls of the backlight frame 1, respectively. The vertical height of the outer frame 16 is less than the vertical height of the backlight frame 1. The thickness of the cross-shaped fixing bracket 19 is less than half the height of the outer frame 16. The movable stabilizing guide rod 17 can move up and down in the movable stabilizing guide hole 15. The fixed connection between the cross-shaped fixing bracket 19 and the outer frame 16 provides a solid support foundation for the entire distance fine-tuning device 3. The cooperation between the movable stabilizing guide rod 17 and the movable stabilizing guide hole 15 plays a good guiding and stabilizing role during the up and down movement of components such as the light guide plate 8. It effectively avoids the components from shifting or shaking during the adjustment process, ensures the stability of the cooperation between the components, and reduces problems such as light leakage and uneven reflection caused by component misalignment.

[0031] like Figure 1 , Figure 4 and Figure 5As shown, the distance fine-tuning device 3 also includes a fine-tuning screw 18, an internal threaded sleeve 20, a plug-in hole 21, and a flat anti-loosening nut 22. A plug-in hole 21 is provided inside the center of the cross-shaped fixing frame 19, into which the internal threaded sleeve 20 is inserted. Flat anti-loosening nuts 22 are fixedly fitted onto the upper and lower ends of the internal threaded sleeve 20. The two flat anti-loosening nuts 22 are located at the top and bottom ends of the cross-shaped fixing frame 19, respectively. A fine-tuning screw 18 is vertically fixed at the center of the bottom end of the back plate 2, and the fine-tuning screw 18 is threaded into the internal threaded sleeve 20. The internal threaded sleeve 20 and the two flat anti-loosening nuts 22 form an I-shaped anti-loosening structure, meaning the internal threaded sleeve 20 can rotate clockwise and counterclockwise in the plug-in hole 21, while the two flat anti-loosening nuts 22 prevent the internal threaded sleeve 20 from moving up and down during rotation. This is achieved through the fine-tuning screw 18 and the internal threaded sleeve 20... The threaded fit and the guiding effect of the movable stabilizing guide rod 17 in the movable stabilizing guide hole 15 enable the back plate 2, reflector 4, and light guide plate 8 to move up and down stably. This adjustment method has high precision and can accurately change the relative distance between the light guide plate 8 and the LED light source chip 7 on the PCB light strip 5, as well as the spacing between the light guide plate 8 and the reflector 4, according to actual usage requirements. This optimizes the transmission and reflection effect of light in the light guide plate 8, making the light distribution more uniform and improving the overall light emission quality of the LED backlight. In addition, the I-shaped anti-loosening structure formed by the inner threaded sleeve 20 and the two flat anti-loosening nuts 22 can not only ensure that the inner threaded sleeve 20 can rotate freely in the insertion hole 21, but also prevent it from moving up and down. This avoids the risk of the inner threaded sleeve 20 falling off during long-term use or adjustment, and ensures the long-term effectiveness of the fine adjustment function.

[0032] like Figure 1 , Figure 4 and Figure 5As shown, the internal threaded sleeve 20 rotates clockwise and counterclockwise, which in turn drives the fine-tuning screw 18 to move up and down through the thread action. The fine-tuning screw 18 can then drive the back plate 2, the reflector 4, and the light guide plate 8, which is connected to the transparent adhesive strip 12, to move up and down. The principle of the distance fine-tuning device 3 is to achieve precise height adjustment of the back plate 2 and connected components through the cooperation of mechanical structures, thereby optimizing the relative positional relationship between the components. Among them, the cross-shaped fixing bracket 19 is fixed inside the outer frame 16, providing stable support for the entire device. The cooperation between the movable stabilizing guide rod 17 and the movable stabilizing guide hole 15 plays a guiding and stabilizing role, ensuring that the back plate 2 does not shift when moving up and down. The inner threaded sleeve 20 and the cross-shaped fixing bracket 19 form an I-shaped anti-loosening structure through the flat anti-loosening nut 22, so that the inner threaded sleeve 20 can rotate freely in the insertion hole 21 without moving up and down. When the inner threaded sleeve 20 is rotated, it uses its threaded engagement with the fine-tuning screw 18 to drive the fine-tuning screw 18 to move up and down through the threaded transmission, thereby driving the back plate 2, reflector 4 and light guide plate 8 connected to the fine-tuning screw 18 to move up and down synchronously, so as to realize the fine adjustment of the distance between the light guide plate 8 and the LED light source chip 7 and reflector 4 on the PCB light strip 5, so as to adapt to different usage requirements, optimize the light transmission and reflection effect, and improve the overall performance of LED backlight.

[0033] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0034] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications, substitutions, and improvements without departing from the concept of this utility model, and these should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the claims.

Claims

1. A reflective optical structure for LED backlighting, characterized in that, The backlight includes a backlight frame (1) and a back plate (2) located inside the bottom of the backlight frame (1). A reflective sheet (4) is attached to the outer wall of the top of the back plate (2). The reflective sheet (4) can reflect the light source acting on its upper surface upward. Transparent adhesive strips (12) are attached to the outer wall of the top of the reflective sheet (4) near the left and right ends. A light guide plate (8) is attached to the top of the two transparent adhesive strips (12). PCB light strips (5) are provided on both the left and right sides of the light guide plate (8). Multiple LED light source chips (7) are equidistantly arranged on the two PCB light strips (5). A distance fine adjustment device (3) is connected between the bottom of the backlight frame (1) and the back plate (2). The distance fine-tuning device (3) includes a movable stabilizing guide hole (15), an outer frame (16), a movable stabilizing guide rod (17), and a cross-shaped fixing bracket (19). The back plate (2) is set to be movable inside the bottom end of the backlight frame (1). The bottom end of the backlight frame (1) is provided with an outer frame (16). The bottom end of the outer frame (16) is provided with a cross-shaped fixing bracket (19). The left and right ends and the front and rear ends of the cross-shaped fixing bracket (19) are fixedly connected to the inner walls of the left and right ends and the front and rear ends of the outer frame (16), respectively. The cross-shaped fixing bracket (19) is provided with movable stabilizing guide holes (15) near the left and right ends and the front and rear ends. The center of the bottom outer wall of the back plate (2) is vertically fixed with movable stabilizing guide rods (17) on the left and right sides and the front and rear sides. The bottom ends of the four movable stabilizing guide rods (17) pass through the movable stabilizing guide holes (15) corresponding to their positions.

2. The reflective optical structure for LED backlighting according to claim 1, characterized in that, The outer frame (16) is flush with the outer and inner walls of the backlight frame (1). The vertical height of the outer frame (16) is less than the vertical height of the backlight frame (1). The thickness of the cross-shaped fixing bracket (19) is less than half the height of the outer frame (16). The movable stabilizing guide rod (17) can move up and down in the movable stabilizing guide hole (15).

3. The reflective optical structure for LED backlighting according to claim 2, characterized in that, The distance fine-tuning device (3) also includes a fine-tuning screw (18), an internal threaded sleeve (20), a plug hole (21), and a flat anti-loosening nut (22). The center of the cross-shaped fixing frame (19) is provided with a plug hole (21). An internal threaded sleeve (20) is inserted into the plug hole (21). Flat anti-loosening nuts (22) are sleeved and fixed on both the upper and lower ends of the internal threaded sleeve (20). The two flat anti-loosening nuts (22) are located at the top and bottom of the cross-shaped fixing frame (19), respectively. A fine-tuning screw (18) is vertically fixed at the center of the bottom end of the back plate (2), and the fine-tuning screw (18) is threaded into the internal threaded sleeve (20).

4. The reflective optical structure for LED backlighting according to claim 3, characterized in that, The internal threaded sleeve (20) and the two flat anti-loosening nuts (22) form an I-shaped anti-loosening structure, that is, the internal threaded sleeve (20) can rotate clockwise and counterclockwise in the insertion hole (21), while the two flat anti-loosening nuts (22) can prevent the internal threaded sleeve (20) from moving up and down during rotation.

5. A reflective optical structure for LED backlighting according to claim 4, characterized in that, The internal threaded sleeve (20) can rotate clockwise and counterclockwise to drive the fine adjustment screw (18) to move up and down through the thread action. The fine adjustment screw (18) can drive the back plate (2), the reflector (4) and the light guide plate (8) connected by the transparent adhesive strip (12) to move up and down.

6. The reflective optical structure for LED backlighting according to claim 1, characterized in that, The light emitted by the multiple LED light source chips (7) on the PCB light strip (5) will be guided into the light guide plate (8), and the reflector (4) can reflect the light upward below the light guide plate (8). The top of each of the two PCB light strips (5) is fixed with a light shield (6), which can prevent the light emitted by the LED light source chips (7) from shining directly upward.

7. A reflective optical structure for LED backlighting according to claim 6, characterized in that, The top ends of the two light-shielding strips (6) are connected to a diffuser plate (9). A diffuser film (10) is pasted on the outer wall of the top end of the diffuser plate (9). The thickness of the diffuser film (10) is less than the thickness of the diffuser plate (9), and there are no air bubbles between the diffuser film (10) and the diffuser plate (9). The diffuser film (10) and the diffuser plate (9) are both located inside the frame of the backlight frame (1).

8. A reflective optical structure for LED backlighting according to claim 7, characterized in that, An LCD panel (11) is disposed above the diffusion film (10), and the LCD panel (11) does not contact the diffusion film (10). The LCD panel (11) is sealed and fixed inside the top opening of the backlight frame (1).

9. A reflective optical structure for LED backlighting according to claim 8, characterized in that, The backlight frame (1) has mounting strips (14) welded to the outer walls of both the left and right ends. The two mounting strips (14) are flush with the bottom outer wall of the backlight frame (1). The two mounting strips (14) are provided with multiple screw holes (13) inside.

10. A reflective optical structure for LED backlighting according to claim 9, characterized in that, Screws can be directly inserted into the screw holes (13). After the mounting strip (14) is attached to the installation position, the mounting strip (14) can be directly fixed at the installation position through the mounting screws inside the screw holes (13).

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