LED backlight source structure for hybrid liquid crystal display screen

Abstract

The invention relates to the technical field of high-performance mixed liquid crystal display screens, in particular to an LED backlight source structure for a mixed liquid crystal display screen, which comprises a back plate, a light guide plate, a diffusion sheet, a brightness enhancement sheet and a liquid crystal panel. A light-emitting chamber is formed in the back plate, the light source part is arranged in the light-emitting chamber, and a mounting gap is formed between one end of the light guide plate and the inner plate wall of the back plate. The installation part is integrally formed on the inner plate wall of the back plate, the limiting shielding mechanism is slidably installed on the installation part, and a blocking piece is arranged on the inner wall of the back plate. When the liquid crystal panel is not installed, the blocking piece and the limiting shielding mechanism are in a locking state; after the liquid crystal panel is installed, the blocking piece and the limiting shielding mechanism are unlocked under pressure, the limiting shielding mechanism partially slides out and abuts against the diffusion piece and the brightness enhancement piece, the diffusion piece and the brightness enhancement piece are kept stable under the constraint of the limiting shielding mechanism and the inner wall of the back plate, and meanwhile a closed light guide space is defined by the limiting shielding mechanism and the installation gap. The structure is high in control precision, high in reliability and beneficial to improving light guide uniformity and light energy utilization rate.

Description

Technical Field

[0001] This application relates to the field of high-performance hybrid liquid crystal display technology, and more particularly to an LED backlight structure for hybrid liquid crystal displays. Background Technology

[0002] Currently, high-performance hybrid liquid crystal displays (LCLs) combine liquid crystal display (LCD) technology with other display technologies such as OLED, quantum dot, or backlighting technology, aiming to provide higher brightness, color accuracy, contrast, and faster response times. Compared to traditional LCDs, hybrid LCLs typically employ innovative backlighting systems or display panel structures to improve display performance. The backlight, located behind the LCD, directly affects the visual effect of the liquid crystal display module. LCDs themselves do not emit light; they display graphics or characters as a result of light modulation and are widely used in various industries.

[0003] In related technologies, such as Chinese Patent Publication No. CN119960227A, a high-performance hybrid liquid crystal display LED backlight and its manufacturing method are disclosed. This backlight includes a backplate, a light guide plate, a diffuser, a brightness enhancement film, and a liquid crystal panel. A light-emitting chamber is provided within the backplate, and the light source is installed in the light-emitting chamber and fixed by a mounting gap between the mounting part and the light guide plate. A shielding part is provided above the mounting gap, forming a closed space together with the mounting gap, allowing the light from the light source to effectively act on the light guide plate. A limiting shielding mechanism is also provided within the backplate, which can switch from a first state to a second state when the ambient temperature rises to a preset temperature. In the first state, the limiting shielding mechanism maintains a distance from the diffuser and brightness enhancement film; while in the second state, the limiting shielding mechanism abuts against the diffuser and brightness enhancement film, fixing the diffuser and brightness enhancement film within the backplate through double constraint by the side walls of the backplate, thereby optimizing the light efficiency of the backlight.

[0004] Through research, the inventors discovered that the backlight's internal ambient temperature is uncontrollable during use, which can easily lead to the brightness displayed on the LCD panel not reaching the expected effect. Summary of the Invention

[0005] This application provides an LED backlight structure for a hybrid liquid crystal display screen to at least partially solve the above-mentioned technical problems.

[0006] To achieve the above objectives, this application provides an LED backlight structure for a hybrid liquid crystal display screen, including a back plate, wherein a light guide plate, a diffuser, a brightness enhancement plate, and a liquid crystal panel are disposed therefrom bottom to top within the back plate, and further comprising: The light source unit has a light-emitting chamber formed inside the back plate on one side of the light guide plate, and the light source unit is installed inside the light-emitting chamber; The mounting part is integrally formed on the inner wall of the back plate located in the light-emitting chamber. An installation gap is formed between one end of the light guide plate and the mounting part in the light-emitting chamber, and the light source part is located within the installation gap. A limiting and blocking mechanism is slidably mounted on the mounting portion; A blocking element is disposed in the inner wall of the back plate; wherein, When the LCD panel is not mounted on the back panel, the blocking member and the limiting and blocking mechanism are locked, so that the limiting and blocking mechanism is located within the mounting portion; When the liquid crystal panel is mounted on the back plate, the blocking member and the limiting and blocking mechanism are in an unlocked state under the action of the liquid crystal panel. Part of the limiting and blocking mechanism automatically slides out of the mounting part and abuts against the diffuser and the brightness enhancement sheet in the width direction of the back plate, so that the diffuser and the brightness enhancement sheet are limited within the back plate under the dual restriction of the limiting and blocking mechanism and the inner wall of the back plate. At the same time, together with the mounting gap, they form a light guide space that encloses the light source, so that most of the light emitted by the light source acts on the light guide plate.

[0007] Optionally, the blocking member includes a blocking plate and a plug-in block. A slot is formed on the wall of the back plate along the thickness direction of the back plate. The blocking plate is inserted into the slot. A snap-fit ​​cavity communicating with the slot is formed in the wall of the back plate. The lower end of the blocking plate and part of the limiting and blocking mechanism are located in the snap-fit ​​cavity. The plug-in block is disposed at the end of the blocking plate located in the snap-fit ​​cavity, and the plug-in block is used to partially limit and cooperate with the limiting and blocking mechanism to restrict the movement of the limiting and blocking mechanism on the mounting plate along the width direction of the back plate. An insulating rubber layer is provided on the inner wall of the slot. The insulating rubber layer is used to press against the rod wall of the baffle plate so that the upper end of the baffle plate is kept in the position of extending out of the slot.

[0008] Optionally, the edge of the LCD panel is provided with a protective block, the back plate is provided with a receiving groove, the end of the slot away from the snap-fit ​​cavity is connected to the receiving groove, and the upper end of the blocking plate is located in the receiving groove, the receiving groove is used to fit with the protective block; When the protective block is embedded in the receiving groove, the blocking plate is pressed downward to release the limiting engagement state between the plug block and the limiting blocking mechanism.

[0009] Optionally, the limiting and blocking mechanism includes a limiting plate, and a limiting channel is formed on the mounting part along the width direction of the back plate. The first end of the limiting channel is connected to the snap-fit ​​cavity, and the second end of the limiting channel is directly opposite the joint between the diffuser and the brightness enhancement film. The limiting plate is slidably inserted into the limiting channel, and the end of the limiting plate located in the snap-fit ​​cavity is used to limit and cooperate with the plug block when the liquid crystal panel is not installed on the back plate.

[0010] Optionally, a limiting groove is formed on the rod wall of the limiting plate, the limiting groove extending through the limiting plate along the thickness direction of the back plate, and one side of the limiting groove is also open. When the LCD panel is not mounted on the back plate, the plug block is embedded in the limiting groove to restrict the movement of the limiting plate; When the LCD panel is mounted on the back plate, the plug block moves downward away from the limiting groove to release the movement restriction on the limiting plate.

[0011] Optionally, it also includes an elastic component, which is disposed in the mounting portion and connected to the limiting plate. The elastic component is used to drive the limiting plate to slide in the limiting channel toward the side away from the snap-fit ​​cavity when the plug block and the limiting plate are released from the limiting engagement, so that the limiting plate abuts against the outer end wall of the diffuser and the brightness enhancement sheet.

[0012] Optionally, the elastic component includes a spring and a connecting block. A side groove is formed on the inner side wall of the limiting channel along the length direction of the limiting channel. The connecting block is disposed on the rod wall of the limiting plate and slides with the side groove. One end of the spring is connected to the inner end wall of the side groove and the other end is connected to the connecting block. When the plug is embedded in the limiting groove, the spring is in a compressed state; When the plug block disengages from the limiting groove, the spring drives the end of the limiting plate away from the snap-fit ​​cavity to simultaneously abut against the outer end wall of the diffuser and the brightness enhancement sheet.

[0013] Optionally, a rubber block is provided at the end of the limiting plate away from the snap-fit ​​cavity.

[0014] Optionally, the limiting and blocking mechanism further includes a blocking plate, the lower surface of which has a receiving groove for accommodating the blocking plate, one end of which is rotatably connected to the inner end wall of the receiving groove near the snap-fit ​​cavity. When the limiting plate and the plug block are in a limiting engagement, the rotating connection between the baffle plate and the inner end wall of the storage groove is located within the limiting channel, and the baffle plate is embedded in the storage groove. When the limiting plate abuts against the outer end wall of the diffuser and the brightness enhancement plate, the rotatable connection between the shielding plate and the inner end wall of the receiving groove is located outside the limiting channel, and the end of the shielding plate away from the rotatable connection rotates downward and abuts against the upper plate surface of the light guide plate near the installation gap, so that the shielding plate and the installation gap together form a light guide space that encloses the light source part.

[0015] Optionally, a torsion spring is provided at the rotatable connection between the shield and the inner end wall of the storage groove. The torsion spring always tends to drive the shield to rotate towards the outside of the storage groove and closer to the installation gap side.

[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. This application provides a sliding limiting and blocking mechanism in the light-emitting chamber of the back panel, which forms a matching structure with the inner wall of the back panel. This allows the diffuser and brightness enhancement film to automatically abut against each other through mechanical sliding when the LCD panel is installed. This eliminates the need to rely on temperature changes or deformation caused by thermal expansion and contraction to achieve bonding. Compared with the existing technology that relies on a temperature-controlled structure to drive the components to abut against each other, the structural control is more direct and stable.

[0017] 2. This application employs a linkage locking and unlocking design between the blocking component and the limiting and shielding mechanism. This automatically switches the movement state of the limiting and shielding mechanism before and after the LCD panel is installed. Before the LCD panel is installed, it does not affect the installation of the diffuser and brightness enhancement film. After the LCD panel is installed, it forms a double-sided limiting constraint on the diffuser and brightness enhancement film, ensuring their stable position and uniform force, further guaranteeing the optical flatness and light guiding efficiency between the backlight layers. This mechanical limiting structure has the advantages of high controllability, reliable operation, and rapid structural response. It can maintain the relative position stability of the light guide plate and the light source in different working environments, improving the optical uniformity and reliability of the hybrid LCD display, ultimately ensuring that the display brightness of the LCD panel reaches the expected level.

[0018] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0021] Figure 1This is an exploded view of the LED backlight structure according to an embodiment of this application; Figure 2 yes Figure 1 A partially enlarged schematic diagram of the central light-emitting chamber; Figure 3 This is a schematic diagram of the overall structure of the LED backlight structure according to an embodiment of this application; Figure 4 yes Figure 3 A partially enlarged schematic diagram of the central light-emitting chamber; Figure 5 It is a partial exploded view of the blocking component and the limiting plate; Figure 6 This is a partial view showing the state of the plug-in block inserted into the limiting slot; Figure 7 This is a partial view showing the plug-in block disengaging downwards from the limiting groove; Explanation of reference numerals in the attached figures: 1. Backplate; 11. Light-emitting chamber; 111. Mounting gap; 112. Light guiding space; 12. Slot; 13. Snap-fit ​​cavity; 14. Insulating rubber layer; 15. Receiving groove; 2. Light guide plate; 3. Diffusion sheet; 4. Brightness enhancement film; 5. LCD panel; 51. Protective block; 6. Light source section; 7. Installation section; 71. Limiting channel; 72. Side groove; 8. Limiting and blocking mechanism; 81. Limiting plate; 811. Limiting groove; 812. Rubber block; 813. Storage groove; 82. Blocking plate; 821. Torsion spring; 9. Blocking component; 91. Blocking plate; 92. Connecting block; 10. Elastic component; 101. Spring; 102. Connecting block. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0023] In the field of high-performance hybrid liquid crystal display (LCD) technology, the combination of LCD technology with other display technologies has significantly improved display performance. Hybrid LCDs aim to provide higher brightness, color accuracy, contrast, and faster response times. Compared to traditional LCDs, they typically employ innovative backlight systems or display panel structures to optimize display effects. As a light-modulating device, an LCD does not emit light itself; it displays images or text by adjusting the light from a backlight source. Therefore, the performance of the backlight directly affects the visual effect of the display module. An LCD typically consists of multiple components, with the backlight located on the back of the LCD panel 5, including a light guide plate 2, a diffuser 3, a brightness enhancement film, and the LCD panel 5. The light source usually enters from one side of the light guide plate 2, is uniformly diffused by the diffuser 3, and after the brightness enhancement film amplifies the light intensity, the enhanced light finally illuminates the LCD panel 5, thus displaying the image.

[0024] However, in existing technologies, backlight systems often experience issues where the brightness of the LCD panel 5 fails to meet expectations during practical applications. Through in-depth research, the inventors discovered that the root cause of this problem lies in the tendency of the diffuser 3 and brightness enhancement film of the backlight to shift during use. This shift prevents the light emitted by the light source from being effectively transmitted to the LCD panel 5, thus affecting display brightness and quality. Specifically, the shift of the diffuser 3 and brightness enhancement film can cause a deviation in the light propagation path, resulting in uneven light distribution on the LCD panel 5, leading to display problems such as uneven brightness and color distortion. Furthermore, the light emitted by the light source itself can easily leak to the back of the LCD screen or other parts, preventing the backlight brightness from being fully transmitted to the light guide plate 2, further affecting the stability and consistency of the display effect.

[0025] The shortcomings of existing technologies are mainly concentrated in two aspects: first, the displacement of the diffuser 3 and the brightness enhancement film, which prevents the brightness of the light source from being uniformly and effectively transmitted to the LCD panel 5; second, the leakage of light from the light source, resulting in brightness loss and affecting the display effect of the LCD panel 5. These problems not only reduce the overall quality of the display effect but may also affect the competitiveness of LCD displays in high-performance display applications. Therefore, how to solve the problem of light efficiency loss caused by the displacement of the diffuser 3 and the brightness enhancement film, and how to effectively prevent the leakage of light from the light source, have become urgent technical challenges to be solved in current LCD backlight technology.

[0026] For example, Chinese patent CN119960227A discloses an LED backlight and manufacturing method for a high-performance hybrid liquid crystal display. The diffuser 3 and the brightness enhancement sheet 4 are fixed inside the back plate 1 by double restriction of the side wall of the back plate 1, thereby optimizing the light effect of the backlight. However, during the use of this backlight, the internal ambient temperature is uncontrollable, which may cause the brightness displayed on the liquid crystal panel 5 to still not reach the expected effect.

[0027] Based on this, this application provides an LED backlight structure for a hybrid liquid crystal display screen. Please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 and Figure 4 The backlight structure includes a back plate 1, a light guide plate 2, a diffuser 3, a brightness enhancement plate 4, a liquid crystal panel 5, a light source 6, a mounting part 7, a limiting and blocking mechanism 8, and a blocking member 9.

[0028] For example, the back plate 1 serves as the supporting foundation for the entire backlight structure. Inside it, a light guide plate 2, a diffuser sheet 3, a brightness enhancement sheet 4, and a liquid crystal panel 5 are arranged in layers, forming the main optical path of the backlight from bottom to top. A light-emitting chamber 11 is formed on one side of the light guide plate 2 inside the back plate 1, and a light source 6 is installed in the light-emitting chamber 11 to emit light to one side of the light guide plate 2.

[0029] Furthermore, the mounting part 7 is integrally formed on the inner wall of the back plate 1 located in the light-emitting chamber 11. A mounting gap 111 is provided between the mounting part 7 and one end of the light guide plate 2, and the light source part 6 is located within the mounting gap 111. It can be understood that with this structural arrangement, the light emitted by the light source part 6 can directly enter the light-incident surface of the light guide plate 2, and after passing through the multi-stage optical adjustment of the diffuser 3 and the brightness enhancement sheet 4, it is transmitted to the liquid crystal panel 5, thereby achieving uniform light distribution and enhanced brightness.

[0030] For example, the limiting and blocking mechanism 8 is slidably mounted on the mounting part 7, and its movement direction is along the width direction of the back plate 1. Figure 1 The horizontal (upward) arrangement is used to perform different limiting functions at different stages of backlight structure assembly. The blocking member 9 is disposed in the inner wall of the back plate 1 and cooperates with the limiting and blocking mechanism 8 to form an unlockable mechanical connection. When the liquid crystal panel 5 is not installed at the opening end of the back plate 1, the blocking member 9 and the limiting and blocking mechanism 8 are in a locked state, and the limiting and blocking mechanism 8 is kept inside the mounting part 7, which does not affect the assembly operation of the light source part 6 and the light guide plate 2; when the liquid crystal panel 5 is installed at the opening end of the back plate 1 and attached to the surface of the brightness enhancement film 4, the liquid crystal panel 5 applies a pushing force to the blocking member 9, so that the locking relationship between the blocking member 9 and the limiting and blocking mechanism 8 is released, and part of the structure of the limiting and blocking mechanism 8 automatically slides out of the mounting part 7 under the action of the elastic member or the sliding guide surface, and abuts against the diffuser 3 and the brightness enhancement film 4 along the width direction of the back plate 1.

[0031] It is understandable that through this automatic sliding action, the limiting and blocking mechanism 8 and the inner wall of the back panel 1 on the other side form a double limiting structure in the width direction, which can limit the lateral displacement of the diffuser 3 and the brightness enhancement film 4 to a certain extent, ensuring a more stable attachment state inside the back panel 1. The advantage of this structural design is that the driving of the limiting and blocking mechanism 8 does not depend on temperature changes or external control, but is directly related to the installation action of the LCD panel 5, so that the driving process is naturally coupled with the assembly sequence of the backlight, thereby completing the positioning of the optical components at the same time as the assembly is completed. This structure can effectively reduce the relative displacement of the diffuser 3 and the brightness enhancement film 4 caused by thermal expansion and contraction or mechanical vibration during use, maintain the stability of the light transmission path, and help maintain the brightness consistency and color uniformity of the LCD panel 5 during operation.

[0032] Furthermore, when the limiting and blocking mechanism 8 slides out of the mounting portion 7 and abuts against the diffuser sheet 3 and the brightness enhancement sheet 4, another part of the limiting and blocking mechanism 8 can form a closed structure with the mounting gap 111. This closed structure and the mounting gap 111 together enclose the light guide space 112. This light guide space 112 forms a relatively closed optical path environment between the light-emitting surface of the light source portion 6 and the light-incident surface of the light guide plate 2, which can suppress the leakage of light to the outside of the backlight to a certain extent, so that most of the bright light emitted by the light source portion 6 is concentrated on the light guide plate 2, thereby improving the light guiding efficiency and brightness utilization rate. Since the light is confined to propagate within the light guide space 112, the internal light received by the light guide plate 2 is more sufficient, which can further improve the brightness characteristics of the display area of ​​the liquid crystal panel 5.

[0033] In some optional embodiments, the limiting and blocking mechanism 8 may include a sliding base, a guide groove, and an elastic limiting member. The sliding base is mounted on the mounting portion 7 and is guided to move along the width direction via the guide groove. The elastic limiting member is arranged between the sliding base and the mounting portion 7 to provide sliding force in the unlocked state and to automatically return the limiting and blocking mechanism 8 to its original position after the LCD panel 5 is removed. The blocking member 9 may adopt a snap-fit ​​structure with a certain degree of elasticity to form a plug-in locking relationship with the limiting and blocking mechanism 8, and the locking and unlocking state switching between the two is controlled by the installation or removal action of the LCD panel 5.

[0034] Based on this, the LED backlight structure achieves automatic operation of the limiting and blocking mechanism 8 at the assembly end through mechanical linkage. This creates a natural time synchronization between the limiting of optical components and the backlight assembly steps, simplifying the assembly process and improving positioning accuracy. The linkage between the limiting and blocking mechanism 8 and the blocking component 9 also avoids structural offset problems caused by human assembly errors, thereby ensuring the stable position of the diffuser 3 and the brightness enhancement film 4 in the light guide path. The overall structure has significant improvements in luminous efficiency stability, light utilization, and optical uniformity, providing high-brightness and high-uniformity backlight conditions for hybrid liquid crystal displays, meeting the needs of high-performance display applications.

[0035] In some embodiments, such as Figures 1 to 4 As shown, the blocking member 9 includes a blocking plate 91 and a plug-in block 92. A slot 12 is provided on the wall of the back plate 1 along the thickness direction of the back plate 1. The blocking plate 91 is inserted into the slot 12. A snap-fit ​​cavity 13 communicating with the slot 12 is provided in the wall of the back plate 1. The lower end of the blocking plate 91 and part of the limiting and blocking mechanism 8 are located in the snap-fit ​​cavity 13. The plug-in block 92 is provided at one end of the blocking plate 91 located in the snap-fit ​​cavity 13, and the plug-in block 92 is used to partially limit and cooperate with the limiting and blocking mechanism 8 to restrict the movement of the limiting and blocking mechanism 8 on the mounting plate along the width direction of the back plate 1.

[0036] For example, an insulating rubber layer 14 is provided on the inner wall of the slot 12. The insulating rubber layer 14 is used to press and cooperate with the rod wall of the blocking plate 91 so that the upper end of the blocking plate 91 is kept in the position of extending out of the slot 12, thereby keeping the blocking plate 91 stable in the assembled state and preventing it from sliding freely due to gravity or micro-vibration, thus maintaining the cooperation relationship between the blocking member 9 and the limiting and blocking mechanism 8 to a certain extent.

[0037] In some embodiments, such as Figures 1 to 4 As shown, the edge of the LCD panel 5 is provided with a protective block 51, and the back panel 1 is provided with a receiving groove 15. The end of the slot 12 away from the snap-fit ​​cavity 13 is connected to the receiving groove 15, and the upper end of the blocking plate 91 is located in the receiving groove 15. The receiving groove 15 is used to fit with the protective block 51.

[0038] Specifically, when the protective block 51 is embedded in the receiving groove 15, the blocking plate 91 is pressed downward to release the limiting engagement state of the plug block 92 and the limiting shielding mechanism 8.

[0039] It is understood that when the LCD panel 5 is installed, the protective block 51 is embedded in the receiving groove 15 and can directly contact the upper end of the blocking plate 91. The lower end of the blocking plate 91 is located in the snap-fit ​​cavity 13, and the insertion block 92 is fixed to the end of the blocking plate 91 located in the snap-fit ​​cavity 13. The snap-fit ​​cavity 13 is connected to the slot 12, and its internal space can simultaneously accommodate the lower end of the blocking member 9 and a part of the limiting and blocking mechanism 8, so that the two can form an unlockable limiting engagement relationship.

[0040] In some embodiments, such as Figures 1 to 4 As shown, the limiting and blocking mechanism 8 includes a limiting plate 81. A limiting channel 71 is formed on the mounting part 7 along the width direction of the back plate 1. The limiting plate 81 is slidably inserted into the limiting channel 71. The first end of the limiting channel 71 is connected to the snap-fit ​​cavity 13, and the second end of the limiting channel 71 is directly opposite the joint between the diffuser 3 and the brightness enhancement film 4, so that the end wall of the limiting plate 81 sliding out of the limiting channel 71 can directly abut against the side walls of the diffuser 3 and the brightness enhancement film 4. Furthermore, the end of the limiting plate 81 located in the snap-fit ​​cavity 13 is used to limit and cooperate with the insertion block 92 when the liquid crystal panel 5 is not installed on the back plate 1.

[0041] For example, combined Figure 5 , Figure 6 A limiting groove 811 is provided on the rod wall of the limiting plate 81. The limiting groove 811 extends through the limiting plate 81 along the thickness direction of the back plate 1, and one side of the limiting groove 811 is also open. When the LCD panel 5 is not installed on the back plate 1, the plug block 92 is embedded in the limiting groove 811 to restrict the movement of the limiting plate 81. At this time, the limiting plate 81 remains stationary during the backlight assembly process and will not be displaced due to external vibration or other operations, thus ensuring the assembly accuracy of the light source 6 and the light guide plate 2.

[0042] Furthermore, combined Figure 5 , Figure 7 When the LCD panel 5 is mounted on the back plate 1, the insertion block 92 disengages downward from the limiting groove 811 to release the movement restriction on the limiting plate 81. It can be understood that when the LCD panel 5 is mounted on the back plate 1, its protective block 51 is embedded in the receiving groove 15, and the protective block 51 applies downward pressure to the upper end of the blocking plate 91, causing the blocking plate 91 to move downwards despite the squeezing force of the insulating rubber layer 14. As the blocking plate 91 moves downwards, the insertion block 92 moves downwards along with the blocking plate 91, thereby disengaging from the limiting groove 811 and releasing the limiting effect on the limiting plate 81.

[0043] In some embodiments, such as Figures 1 to 4As shown, an LED backlight structure for a hybrid liquid crystal display screen according to this application also includes an elastic component 10. The elastic component 10 is disposed in the mounting part 7 and connected to the limiting plate 81. The elastic component 10 is used to drive the limiting plate 81 to slide in the limiting channel 71 toward the side away from the snap-fit ​​cavity 13 when the plug block 92 and the limiting plate 81 are released from the limiting engagement, so that the limiting plate 81 abuts against the outer end wall of the diffuser 3 and the brightness enhancement sheet 4.

[0044] For example, the elastic component 10 includes a spring 101 and a connecting block 102. A side groove 72 is provided on the inner side wall of the limiting channel 71 along the length direction of the limiting channel 71. The connecting block 102 is disposed on the rod wall of the limiting plate 81 and slides in cooperation with the side groove 72. One end of the spring 101 is connected to the inner end wall of the side groove 72 and the other end is connected to the connecting block 102. When the insertion block 92 is embedded in the limiting groove 811, the spring 101 is in a compressed state. When the insertion block 92 is disengaged from the limiting groove 811, the spring 101 drives the end of the limiting plate 81 away from the snap-fit ​​cavity 13 to simultaneously abut against the outer end wall of the diffuser 3 and the brightness enhancement sheet 4.

[0045] It is understood that when the LCD panel 5 is mounted on the backplate 1, its protective block 51 is embedded in the receiving groove 15. The protective block 51 applies downward pressure to the upper end of the blocking plate 91, causing the blocking plate 91 to move downwards while overcoming the squeezing force of the insulating rubber layer 14. Simultaneously with the downward movement of the blocking plate 91, the insertion block 92 moves downwards along with the blocking plate 91, thereby disengaging from the limiting groove 811 and releasing its limiting effect on the limiting plate 81. At this time, the limiting plate 81 is no longer restricted by the insertion block 92 and slides along the limiting channel 71 away from the snap-fit ​​cavity 13 under the action of the elastic component 10. The elastic component 10 is located within the mounting portion 7 and connected to the limiting plate 81. Its function is to provide a driving force to push the limiting plate 81 to move when the insertion block 92 and the limiting plate 81 are released from their limiting engagement. The elastic component 10 includes a spring 101 and a connecting block 102. A side groove 72 is provided on the inner wall of the limiting channel 71 along its length direction. The connecting block 102 is provided on the rod wall of the limiting plate 81 and slides in cooperation with the side groove 72. One end of the spring 101 is fixed to the inner end wall of the side groove 72, and the other end is connected to the connecting block 102.

[0046] When the plug-in block 92 is inserted into the limiting groove 811, the spring 101 is in a compressed state, storing elastic potential energy. When the plug-in block 92 is disengaged from the limiting groove 811, the spring 101 rebounds from the compressed state, and its rebound force drives the limiting plate 81 to slide towards the far end of the limiting channel 71, so that the end of the limiting plate 81 away from the snap-fit ​​cavity 13 gradually contacts the outer end wall of the diffuser 3 and the brightness enhancement sheet 4. The end position of the limiting channel 71 is designed to face the joint area of ​​the diffuser 3 and the brightness enhancement sheet 4, so the end wall of the limiting plate 81 can simultaneously abut against the side wall of the diffuser 3 and the brightness enhancement sheet 4, forming a common limiting and supporting effect for both.

[0047] For example, a rubber block 812 is provided at the end of the limiting plate 81 away from the snap-fit ​​cavity 13. When the rubber block 812 abuts against the sidewalls of the diffuser 3 and the brightness enhancement film 4, it can buffer the contact force of the limiting plate 81 to a certain extent, reducing the risk of damage to the optical sheet edges caused by rigid contact. In addition, the rubber material has a certain coefficient of friction, which can enhance the stability of the diffuser 3 and the brightness enhancement film 4 in the width direction. With this structure, when the liquid crystal panel 5 is installed, the limiting plate 81 automatically slides to the limiting position, forming a double restriction on the diffuser 3 and the brightness enhancement film 4 in the width direction of the back plate 1 with the inner wall of the back plate 1. That is, it plays a role in suppressing the lateral displacement of the diffuser 3 and the brightness enhancement film 4 in the width direction of the back plate 1, keeping the diffuser 3 and the brightness enhancement film 4 in close contact, and reducing the relative displacement caused by temperature changes, mechanical vibration or assembly tolerances during subsequent use.

[0048] In some implementations, combined Figures 1 to 4 The limiting and blocking mechanism 8 also includes a blocking plate 82. A storage groove 813 for accommodating the blocking plate 82 is provided on the lower plate surface of the limiting plate 81. One end of the blocking plate 82 is rotatably connected to the inner end wall of the storage groove 813 near the snap-fit ​​cavity 13.

[0049] Furthermore, the storage slot 813 is provided with a rotating connecting shaft near the inner end wall of the snap-fit ​​cavity 13, which is used to rotatably connect with one end of the baffle plate 82, so that the baffle plate 82 can rotate in the vertical plane with the rotating connecting shaft as the center.

[0050] For example, the shape of the baffle plate 82 can be a rectangular thin plate structure. When it is stored in the storage groove 813, the width direction of the baffle plate 82 is consistent with the width direction of the limiting plate 81, and the width is slightly smaller than the depth of the storage groove 813, so as to ensure that the baffle plate 82 can be smoothly embedded in the storage groove 813 when rotating.

[0051] For example, when the limiting plate 81 and the plug-in block 92 are in a limiting engagement, the rotatable connection between the baffle plate 82 and the inner end wall of the storage groove 813 is located within the limiting channel 71, and the baffle plate 82 is embedded in the storage groove 813. Because the inner wall of the limiting channel 71 restricts the baffle plate 82, the baffle plate 82 remains embedded in the storage groove 813, preventing the baffle plate 82 from swinging freely during transportation or installation.

[0052] For example, when the limiting plate 81 abuts against the outer end wall of the diffuser 3 and the light enhancement plate 4, the rotatable connection between the shielding plate 82 and the inner end wall of the receiving groove 813 is located outside the limiting channel 71, and the end of the shielding plate 82 away from the rotatable connection rotates downward and abuts against the upper plate surface of the light guide plate 2 near the mounting gap 111, so that the shielding plate 82 and the mounting gap 111 together form a light guide space 112 that encloses the light source part 6.

[0053] In some embodiments, a torsion spring 821 is provided at the rotatable connection between the baffle plate 82 and the inner end wall of the receiving groove 813. The torsion spring 821 always tends to drive the baffle plate 82 to rotate towards the outside of the receiving groove 813 and closer to the mounting gap 111. Further, the torsion spring 821 is sleeved at the rotatable connection at the end of the baffle plate 82, with one end of the torsion spring 821 connected to the inner end wall of the receiving groove 813 and the other end connected to the baffle plate 82, thereby realizing the rotation of the baffle plate 82 relative to the receiving groove 813.

[0054] It is understandable that when the limiting plate 81 is pushed outward and abuts against the outer end wall of the diffuser 3 and the brightening plate 4, the limiting plate 81 drives the shielding plate 82 and its rotating connection to move outward as a whole, so that the rotating connection between the shielding plate 82 and the inner end wall of the receiving groove 813 is separated from the restricted area of ​​the limiting channel 71. At this time, the shielding plate 82 can rotate around the rotating connection axis in the direction of the installation gap 111 under the elastic action of the torsion spring 821 after the external force is released. The torsion spring 821 is sleeved on the rotating connection shaft, and one end of the torsion spring 821 is fixed to the inner end wall of the receiving groove 813, and the other end is connected to the end of the shielding plate 82 near the rotating shaft. The torsion spring 821 is always in a pre-tight state, thereby providing a rotational torque after the limiting plate 81 moves outward, so that the shielding plate 82 rotates in the direction of the installation gap 111. When the shield 82 rotates to a certain angle, its end away from the rotation axis abuts against the upper surface of the light guide plate 2 near the mounting gap 111. The outer surface of the shield 82 and the upper surface of the light guide plate 2 form a certain angle, constituting an inclined structure, so that the shield 82 and the boundary of the mounting gap 111 together enclose a closed light guide space 112.

[0055] Based on this, this structural design effectively surrounds the light source section 6 of the backlight by the space between the baffle plate 82 and the light guide plate 2. This prevents dust or impurity particles in the outside air from entering the area of ​​the light source section 6 through the installation gap 111 to a certain extent. At the same time, it reduces the interference of stray light from the outside, making the light inside the light guide plate 2 more evenly distributed within the enclosed light guide space 112, thereby improving the light utilization rate and light emission uniformity of the backlight. The inclined structure of the baffle plate 82 helps to guide the light scattered from the surface of the light guide plate 2 to reflect on its inner wall, improving the attenuation phenomenon of light in the edge area. Through the rotatable connection structure of the baffle plate 82, when the light source section 6 is maintained or the components are disassembled, the baffle plate 82 can be re-embedded in the storage slot 813 by the movement of the limiting plate 81, thereby achieving structural adaptive change between installation and maintenance operations.

[0056] Furthermore, by installing a torsion spring 821 at the rotational connection between the shielding plate 82 and the inner end wall of the storage slot 813, the shielding plate 82 can be automatically rotated when the state of the limiting plate 81 changes, eliminating the need for an additional drive structure and simplifying the mechanical structure layout of the backlight module. The torsion spring 821 also functions as an automatic reset and angle adjustment mechanism, preventing the shielding plate 82 from swaying irregularly due to gravity or external forces, making its movement smoother and more controllable. This structure, through the cooperation of the limiting plate 81, storage slot 813, shielding plate 82, and torsion spring 821, automatically forms two optical spatial forms under different installation states: a channel storage space in the limiting state and a light-guiding enclosed space in the working state. This establishes a clear logical connection between structure and function, resulting in beneficial improvements in the backlight's enclosure, optical performance, and assembly reliability.

[0057] The working principle of this application is as follows: When the LCD panel 5 is not yet installed on the back plate 1, the blocking plate 91 is pressed by the insulating rubber layer 14 in the slot 12, so that the blocking plate 91 is kept in a state where the upper end is in the receiving groove 15 and the lower end is in the snap-fit ​​cavity 13. At the same time, the end of the blocking plate 91 located in the snap-fit ​​cavity 13 is provided with a plug block 92. The plug block 92 is also partially limited by the limiting and blocking mechanism 8, so that the limiting and blocking mechanism 8 is in the mounting part 7. That is, at this time, the plug block 92 is inserted into the limiting groove 811, which restricts the movement of the limiting plate 81 in the width direction of the back plate 1. At this time, the spring 101 is in a compressed state.

[0058] When the LCD panel 5 is installed on the back plate 1, that is, when the protective block 51 on the LCD panel 5 is embedded in the receiving groove 15, the upper end of the blocking plate 91 is pressured by the protective block 51 and moves downward against the squeezing action of the insulating rubber layer 14. At this time, the plug-in block 92 also moves downward, so that the plug-in block 92 is disengaged from the limiting groove 811. At this time, the plug-in block 92 no longer restricts the limiting plate 81. Then the spring 101 will gradually rebound from the compressed state to the natural state. Under the rebound action of the spring 101, the limiting plate 81 will move away from the snap-fit ​​cavity 13 in the limiting channel 71 and gradually approach the side wall of the diffuser 3 and the brightness enhancement film 4. Since the second end of the limiting channel 71 is directly opposite the joint of the diffuser 3 and the brightness enhancement film 4, the end wall of the limiting plate that moves out of the limiting channel 71 simultaneously abuts against the side wall of the diffuser 3 and the brightness enhancement film 4, thereby completing the limiting of the diffuser 3 and the brightness enhancement film 4 in the back plate 1. Meanwhile, a rubber block 812 is provided at the end of the limiting plate 81 away from the snap-fit ​​cavity 13. Therefore, the rubber block 812 will abut against the side wall of the diffuser 3 and the brightening sheet 4, which can reduce the abutting force to a certain extent and avoid abutting damage.

[0059] When the limiting plate 81 and the plug block 92 are in a limiting engagement, the limiting plate 81 is stored in the limiting channel 71 of the mounting part 7. At the same time, the rotating connection between the baffle plate 82 and the inner end wall of the storage groove 813 is located in the limiting channel 71. The baffle plate 82 is also stored in the storage groove 813 under the limiting action of the limiting channel 71. When the limiting plate 81 abuts against the outer end wall of the diffuser 3 and the light enhancement plate 4, the rotating connection between the shielding plate 82 and the inner end wall of the receiving groove 813 is located outside the limiting channel 71. At this time, the shielding plate 82 is no longer limited by the inner wall of the limiting channel 71. At the same time, under the action of the torsion spring 821, the shielding plate 82 will rotate around the rotating connection, so that the end of the shielding plate 82 away from the torsion spring 821 abuts against the upper plate surface of the light guide plate 2 near the mounting gap 111. At this time, the shielding plate 82 is in an inclined state, and the shielding plate 82 and the mounting gap 111 together form a light guide space 112 that encloses the light source part 6.

[0060] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0061] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0062] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0063] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A LED backlight structure for mixing liquid crystal display, comprising a back plate (1), a light guide plate (2), a diffusion sheet (3), a brightness enhancement sheet (4) and a liquid crystal panel (5) are arranged in the back plate (1) from bottom to top, characterized in that, Also include: Light source part (6), the backboard (1) in the light guide plate (2) is formed with a light-emitting chamber (11) on one side, the light source part (6) is installed in the light-emitting chamber (11); Mounting portion (7), integrally formed on the inner wall of the backboard (1) in the light-emitting chamber (11), the mounting gap (111) is formed between one end of the light guide plate (2) and the mounting portion (7) in the light-emitting chamber (11), and the light source part (6) is in the mounting gap (111); Limiting shielding mechanism (8), slidably arranged on the mounting portion (7); Barrier (9), provided in the inner wall of the backboard (1); When the liquid crystal panel (5) is not installed on the backboard (1), the barrier (9) and the limiting shielding mechanism (8) are in a locked state, so that the limiting shielding mechanism (8) is in the mounting portion (7); When the liquid crystal panel (5) is installed on the backboard (1), the barrier (9) and the limiting shielding mechanism (8) are in an unlocked state under the action of the liquid crystal panel (5), part of the limiting shielding mechanism (8) automatically slides out of the mounting portion (7) and abuts against the diffusion sheet (3) and the light enhancement sheet (4) in the width direction of the backboard (1), so that the diffusion sheet (3) and the light enhancement sheet (4) are limited in the backboard (1) under the double limitation of the limiting shielding mechanism (8) and the inner wall of the backboard (1), and are jointly enclosed with the mounting gap (111) to form a light guide space (112) enclosing the light source part (6), so that most of the light emitted by the light source part (6) acts on the light guide plate (2).

2. The LED backlight structure for a hybrid liquid crystal display according to claim 1, wherein, The barrier (9) includes a blocking plate (91) and a plug-in block (92), the plate wall of the backboard (1) is provided with a plug-in slot (12) in the thickness direction of the backboard (1), the blocking plate (91) is inserted into the plug-in slot (12), the plate wall of the backboard (1) is provided with a clamping cavity (13) communicating with the plug-in slot (12), the lower end of the blocking plate (91) and part of the limiting shielding mechanism (8) are located in the clamping cavity (13), the plug-in block (92) is arranged at one end of the blocking plate (91) in the clamping cavity (13), and the plug-in block (92) is used for limiting cooperation with part of the limiting shielding mechanism (8) to limit the movement of the limiting shielding mechanism (8) on the mounting plate in the width direction of the backboard (1); An insulating rubber layer (14) is arranged on the inner wall of the plug-in slot (12), and the insulating rubber layer (14) is used for extrusion cooperation with the rod wall of the blocking plate (91), so that the upper end of the blocking plate (91) is kept at a position extending out of the plug-in slot (12).

3. The LED backlight structure for a hybrid liquid crystal display according to claim 2, wherein, The plate wall edge of the liquid crystal panel (5) is provided with a protection block (51), the plate wall of the backboard (1) is provided with a containing groove (15), one end of the plug-in slot (12) away from the clamping cavity (13) communicates with the containing groove (15), and the upper end of the blocking plate (91) is located in the containing groove (15), and the containing groove (15) is used for embedding the protection block (51). When the protection block (51) is embedded in the accommodating groove (15), the blocking plate (91) is pressed to move downward, so that the plug-in block (92) is disengaged from the limiting cooperation state with the limiting and shielding mechanism (8).

4. The LED backlight structure for a hybrid liquid crystal display according to claim 2, wherein, The limiting and shielding mechanism (8) comprises a limiting plate (81), a limiting channel (71) is formed on the mounting portion (7) along the width direction of the back plate (1), a first end of the limiting channel (71) communicates with the clamping cavity (13), a second end of the limiting channel (71) is opposite to the joint between the diffusion sheet (3) and the brightness enhancement sheet (4), the limiting plate (81) is slidably inserted into the limiting channel (71), and one end of the limiting plate (81) located in the clamping cavity (13) is used for limiting cooperation with the plug-in block (92) when the liquid crystal panel (5) is not mounted on the back plate (1).

5. The LED backlight structure for a hybrid liquid crystal display according to claim 4, wherein, A limiting groove (811) is formed on the rod wall of the limiting plate (81), the limiting groove (811) penetrates the limiting plate (81) along the thickness direction of the back plate (1), and one side of the limiting groove (811) is also open, When the liquid crystal panel (5) is not mounted on the back plate (1), the plug-in block (92) is embedded in the limiting groove (811) to limit the movement of the limiting plate (81); When the liquid crystal panel (5) is mounted on the back plate (1), the plug-in block (92) is disengaged from the limiting groove (811) downward to release the movement limitation of the limiting plate (81).

6. The LED backlight structure for a hybrid liquid crystal display according to claim 5, wherein, Further comprising an elastic assembly (10) arranged in the mounting portion (7) and connected with the limiting plate (81), the elastic assembly (10) is used for sliding the limiting plate (81) in the limiting channel (71) away from the clamping cavity (13) when the plug-in block (92) is disengaged from the limiting cooperation with the limiting plate (81), so that the limiting plate (81) abuts against the outer end wall of the diffusion sheet (3) and the brightness enhancement sheet (4).

7. The LED backlight structure for a hybrid liquid crystal display according to claim 6, wherein, The elastic assembly (10) comprises a spring (101) and a connecting block (102), a side groove (72) is formed on the inner side wall of the limiting channel (71) along the length direction of the limiting channel (71), the connecting block (102) is arranged on the rod wall of the limiting plate (81) and slidably cooperates with the side groove (72), one end of the spring (101) is connected with the inner end wall of the side groove (72), and the other end of the spring (101) is connected with the connecting block (102); When the plug-in block (92) is embedded in the limiting groove (811), the spring (101) is in a compressed state; When the plug-in block (92) is disengaged from the limiting groove (811), the spring (101) drives the limiting plate (81) away from the clamping cavity (13) and abuts against the outer end wall of the diffusion sheet (3) and the brightness enhancement sheet (4) at the same time.

8. The LED backlight structure for a hybrid liquid crystal display according to claim 6, wherein, A rubber block (812) is arranged at the end of the limiting plate (81) away from the clamping cavity (13).

9. A LED backlight structure for a hybrid liquid crystal display according to any one of claims 4 to 8, characterized in that, The limiting and shielding mechanism (8) further comprises a shielding plate (82), a receiving groove (813) for accommodating the shielding plate (82) is formed on the lower plate surface of the limiting plate (81), one end of the shielding plate (82) is rotationally connected to the inner end wall of the receiving groove (813) close to the clamping cavity (13), wherein, When the limiting plate (81) is in limiting cooperation with the plug-in block (92), the rotationally connected part of the shielding plate (82) and the inner end wall of the receiving groove (813) is located in the limiting channel (71), and the shielding plate (82) is embedded in the receiving groove (813); When the limiting plate (81) abuts against the outer end wall of the diffusion sheet (3) and the light-enhancing sheet (4), the rotationally connected part of the shielding plate (82) and the inner end wall of the receiving groove (813) is located outside the limiting channel (71), and one end of the shielding plate (82) away from the rotationally connected part rotates downward and abuts against the upper plate surface of the light guide plate (2) close to the mounting gap (111), so that the shielding plate (82) and the mounting gap (111) together enclose a light guide space (112) for enclosing the light source part (6).

10. The LED backlight structure for a hybrid liquid crystal display according to claim 9, wherein, The rotationally connected part of the shielding plate (82) and the inner end wall of the receiving groove (813) is provided with a torsion spring (821), the torsion spring (821) always has a tendency to drive the shielding plate (82) to rotate toward the outside of the receiving groove (813) and close to the mounting gap (111).

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