Backlight module and display device

Abstract

The application provides a backlight module and a display device. The backlight module comprises a supporting shell with a containing cavity, and a light source assembly arranged in the containing cavity. The containing cavity has a light outlet. The containing cavity comprises a bottom wall and a side wall. The bottom wall is arranged opposite to the light outlet. The light source assembly comprises a substrate and light emitting chips arranged in multiple rows and multiple columns on the substrate. The substrate is arranged on the bottom wall. The substrate comprises a first area at the center of the substrate and a second area surrounding the first area. Each light emitting chip in the second area is provided with a lifting device between the light emitting chip and the substrate. The lifting device is used for lifting or lowering the light emitting chip away from one end of the first area. The application solves the problem that the existing display device does not have the function of switching between wide and narrow viewing angles, and it is difficult to meet the different needs of people for the display viewing angle in different occasions.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a backlight module and display device. Background Technology

[0002] In recent years, liquid crystal displays (LCDs) have been widely used in various information and communication consumer products due to their advantages such as small size, high image quality, no radiation, and low driving voltage.

[0003] LCD panels themselves do not emit light and require a backlight module to display images properly. Therefore, the backlight module is one of the key components of an LCD display device. Backlight modules are divided into two types based on the location of the light source: edge-lit backlight modules and direct-lit backlight modules. Regardless of the backlight emission method, LCD panels have improved in terms of brightness, contrast, viewing angle, and viewing field of view. While enjoying the visual experience brought by wide viewing angles, people also want to effectively protect trade secrets and personal privacy to avoid business losses or embarrassment caused by the leakage of screen information. Therefore, it is necessary to design a display device with the function of switching between wide and narrow viewing angles to meet people's different needs for display viewing angles in different situations. Summary of the Invention

[0004] This application provides a backlight module and display device. By setting a lifting device between the light-emitting chip and the substrate in the second region, the end of the light-emitting chip away from the first region is raised or lowered. This solves the problem that existing display devices do not have the function of switching between wide and narrow viewing angles, making it difficult to meet people's different needs for display viewing angles in different occasions.

[0005] The present invention is implemented as follows: a backlight module includes a support shell with a accommodating cavity and a light source assembly disposed within the accommodating cavity. The accommodating cavity has a light outlet and includes a bottom wall and side walls, with the bottom wall disposed opposite to the light outlet. The light source assembly includes a substrate and light-emitting chips arranged in multiple rows and columns on the substrate. The substrate is disposed on the bottom wall. The substrate includes a first region located at the center of the substrate and a second region surrounding the first region. A lifting device is provided between each light-emitting chip in the second region and the substrate. The lifting device is used to lift or lower the end of the light-emitting chip away from the first region.

[0006] In one embodiment, the lifting device includes a bracket, a track connected to the bottom of the bracket, a coil disposed on the side of the track near the first region, a movable body disposed on the track, and a support rod. The movable body is connected to the bracket through an elastic element, and one end of the support rod is rotatably connected to the movable body, and the other end is rotatably connected to the surface of the light-emitting chip near the substrate.

[0007] The coil is used to generate a magnetic field when energized to attract the moving body to move along the track toward the coil, so that the support rod lifts the end of the light-emitting chip away from the first region;

[0008] The elastic element is used to spring the movable body away from the coil when the coil is de-energized, so that the support rod lowers the end of the light-emitting chip away from the first region.

[0009] In one embodiment, the track includes a plurality of cylindrical rods arranged along a first direction; the first direction is either a row direction or a column direction.

[0010] The moving body is spherical, and its direction of movement is parallel to the first direction.

[0011] In one embodiment, the plurality of the arranged rods are spaced apart, and the distance between two adjacent arranged rods is equal;

[0012] The diameter of the moving body is greater than the distance between two adjacent arranged rods.

[0013] In one embodiment, when the movable body is located between two adjacent arrangement rods, the vertical lines connecting the center of the movable body to the central axes of the two adjacent arrangement rods form an angle, and the angle is greater than or equal to 45°.

[0014] In one embodiment, the magnetic field generated when the coil is energized is different from the magnetic field of the moving body.

[0015] In one embodiment, the support, the track, and the movable body are all made of conductive materials;

[0016] The light-emitting chip is disposed on the top of the bracket, and the light-emitting chip is rotatably connected to one end of the top of the bracket near the first region;

[0017] The substrate has pads, and the bracket is welded to the pads.

[0018] In one embodiment, the angle at which the light-emitting chip rotates relative to the bracket toward the first region ranges from 0° to 90°.

[0019] In one embodiment, the second region includes two columns of light-emitting chips located on both sides of the first region along the row direction, and two rows of light-emitting chips located on both sides of the first region along the column direction.

[0020] In one embodiment, the coils of the lifting device connected to a plurality of the light-emitting chips located in the same row in the second region are connected together.

[0021] In one embodiment, the coils of the lifting device connected to a plurality of the light-emitting chips located in the same column in the second region are connected together.

[0022] The beneficial effects of the backlight module provided in this application are as follows: Compared with the prior art, this application divides the substrate into a first region and a second region, and sets a lifting device between the light-emitting chip and the substrate in the second region. The lifting device can lift or lower the end of the light-emitting chip away from the first region, so that the light-emitting chip in the second region can be tilted. When it is necessary to switch to a narrow viewing angle, the end of the light-emitting chip away from the first region is lifted, thereby reducing the light emission angle of the light-emitting chip and realizing the switching of the narrow viewing angle. When it is necessary to switch to a wide viewing angle, the end of the light-emitting chip away from the first region is lowered, thereby increasing the light emission angle of the light-emitting chip and realizing the switching of the wide viewing angle. Thus, the switching between wide and narrow viewing angles is simple and free, enabling the display device using the backlight module of this application to have the function of switching between wide and narrow viewing angles, meeting people's different needs for display viewing angles in different occasions.

[0023] This application also provides a display device, including a backlight module and a display panel as described in any of the above embodiments, wherein the display panel is disposed on the light-emitting side of the backlight module.

[0024] The beneficial effects of the display device provided in this application are as follows: Using the aforementioned backlight module, compared with the prior art, this application divides the substrate into a first region and a second region. A lifting device is provided between the light-emitting chip and the substrate in the second region. This lifting device can raise or lower the end of the light-emitting chip furthest from the first region, allowing the light-emitting chip in the second region to tilt. When a narrow viewing angle is required, the end of the light-emitting chip furthest from the first region is raised, thereby reducing the light-emitting angle of the chip and achieving a narrow viewing angle switch. When a wide viewing angle is required, the end of the light-emitting chip furthest from the first region is lowered, thereby increasing the light-emitting angle of the chip and achieving a wide viewing angle switch. Thus, switching between wide and narrow viewing angles is simple and free, enabling the display device of this application to have the function of switching between wide and narrow viewing angles, meeting people's different needs for display viewing angles in different situations. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the backlight module provided in Embodiment 1 of this application;

[0026] Figure 2 This is a schematic diagram of the structure of the light-emitting chip of the light source component in Embodiment 1 of this application when it is in a horizontal state;

[0027] Figure 3 This is a schematic diagram of the structure of the light-emitting chip of the light source component in Embodiment 1 of this application when it is in an inclined state;

[0028] Figure 4 yes Figure 3 Top view;

[0029] Figure 5 This is a top view of the light source assembly forming a wide viewing angle in Embodiment 1 of this application;

[0030] Figure 6 This is a top view of the light source assembly forming a narrow viewing angle in Embodiment 1 of this application;

[0031] Figure 7 This is a schematic diagram of the structure of the display device provided in Embodiment 2 of this application.

[0032] Reference numerals: 1. Support shell; 10. Receiving cavity; 100. Light outlet; 101. Bottom wall; 102. Side wall;

[0033] 2. Light source assembly; 21. Substrate; 22. Light-emitting chip; 211. First region; 212. Second region;

[0034] 3. Lifting device; 31. Support frame; 32. Track; 33. Coil; 34. Moving body; 35. Support rod; 36. Elastic element; 320. Arrangement rod; 4. Solder pad;

[0035] 200. Backlight module; 300. Display panel. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0038] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0041] This application provides a backlight module and display device, which solves the problem that existing display devices do not have the function of switching between wide and narrow viewing angles, making it difficult to meet people's different needs for display viewing angles in different occasions.

[0042] Example 1

[0043] refer to Figure 1 , Figures 5-6 The backlight module 200 provided in Embodiment 1 of this application includes a support shell 1 with a receiving cavity 10 and a light source assembly 2 disposed in the receiving cavity 10. The receiving cavity 10 has a light outlet 100 and includes a bottom wall 101 and a side wall 102. The bottom wall 101 is disposed opposite to the light outlet 100. The light source assembly 2 includes a substrate 21 and light-emitting chips 22 arranged in multiple rows and columns on the substrate 21. The substrate 21 is disposed on the bottom wall 101. The substrate 21 includes a first region 211 located at the center of the substrate 21 and a second region 212 surrounding the first region 211. A lifting device 3 is provided between each light-emitting chip 22 in the second region 212 and the substrate 21. The lifting device 3 is used to lift or lower the end of the light-emitting chip 22 away from the first region 211.

[0044] In this embodiment, the substrate 21 is divided into a first region 211 and a second region 212. A lifting device 3 is provided between the light-emitting chip 22 in the second region 212 and the substrate 21. The lifting device 3 can lift or lower the end of the light-emitting chip 22 away from the first region 211, so that the light-emitting chip 22 in the second region 212 can be tilted. When it is necessary to switch to a narrow viewing angle, the end of the light-emitting chip 22 away from the first region 211 is lifted. At this time, the light emission direction of the light-emitting chip 22 in the second region 212 will change from facing the light outlet 100 to tilting towards the receiving port. Within cavity 10, the light emission angle of the light-emitting chip 22 can be reduced, enabling the switching of a narrow viewing angle. When a wide viewing angle is required, the end of the light-emitting chip 22 away from the first region 211 is lowered, so that the light emission direction of the light-emitting chips 22 in the first region 211 and the second region 212 is towards the light outlet 100, increasing the light emission angle of the light-emitting chip 22 and enabling the switching of a wide viewing angle. Thus, the switching between wide and narrow viewing angles is simple and free, enabling the display device of this application to have the function of switching between wide and narrow viewing angles, meeting people's different needs for display viewing angles in different situations.

[0045] It should be noted that when the light-emitting chips 22 on the substrate 21 are arranged in multiple rows and columns, a lifting device 3 is provided between each light-emitting chip 22 in the second region 212 and the substrate 21. Specifically, one lifting device 3 can be provided between each light-emitting chip 22 in the second region 212 and the substrate 21, that is, each light-emitting chip 22 in the second region 212 needs to be equipped with a lifting device 3. This allows for individual control of the tilt state of each light-emitting chip 22, so as to adjust the light emission direction of each light-emitting chip 22. Another specific implementation is that the light-emitting chips 22 in the second region 212 can be set as a light strip structure, which can be set as light strips arranged along the row direction X and light strips arranged along the column direction Y. The light strip includes a light board and light-emitting chips 22 mounted on the light board. A lifting device 3 is provided between the light board and the substrate 21. In this way, the lifting device 3 can simultaneously change the light emission direction of all light-emitting chips 22 on the light board, so as to switch between wide and narrow viewing angles more quickly. At least one lifting device 3 is provided between the lamp panel and the base plate 21. This reduces the number of lifting devices 3 required, saving costs and reducing the working time for installing the lifting devices 3, thus improving the installation efficiency of the lifting devices 3.

[0046] In some embodiments, reference Figures 2-3The lifting device 3 includes a bracket 31, a track 32 connected to the bottom of the bracket 31, a coil 33 disposed on the side of the track 32 near the first region 211, a movable body 34 disposed on the track 32, and a support rod 35. The movable body 34 is connected to the bracket 31 through an elastic member 36. One end of the support rod 35 is rotatably connected to the movable body 34, and the other end is rotatably connected to the surface of the light-emitting chip 22 near the substrate 21. The coil 33 is used to generate a magnetic field when energized to attract the movable body 34 to move on the track 32 toward the coil 33, so that the support rod 35 lifts the end of the light-emitting chip 22 away from the first region 211. The elastic member 36 is used to spring the movable body 34 away from the coil 33 when the coil 33 is de-energized, so that the support rod 35 lowers the end of the light-emitting chip 22 away from the first region 211.

[0047] The principle of lifting or lowering the bottom of the end of the light-emitting chip 22 away from the first region 211 by the lifting device 3 is as follows: In the initial state, the coil 33 is not energized, the elastic element 36 is not compressed, the moving body 34 is located at the initial position, and the surface of the light-emitting chip 22 near the substrate 21 is located on the support 31. At this time, the light-emitting direction of the light-emitting chip 22 is consistent with the light-emitting direction of the light-emitting chip 22 in the first region 211, the light-emitting angle of the light-emitting chip 22 is the largest, and the display device realizes the wide viewing angle display function. When it is necessary to switch from a wide viewing angle to a narrow viewing angle, the coil 33 is energized. The coil 33 generates a magnetic field to attract the moving body 34 from the track 32 to the coil 33. Since the moving body 34 is connected to the bracket 31 through the elastic element 36, the elastic element 36 will be compressed at this time. The two ends of the support rod 35 are rotatably connected to the bottom surface of the light-emitting chip 22 and the moving body 34, respectively. Therefore, when the moving body 34 moves towards the coil 33, the support rod 35 will lift the light-emitting chip 22, thereby lifting the end of the light-emitting chip 22 away from the first region 211. The light emission direction of the light-emitting chip 22 will change from facing the light outlet 100 to tilting towards the cavity, reducing the light emission angle and enabling the display device to achieve the display function of a narrow viewing angle. When it is necessary to switch from a narrow viewing angle to a wide viewing angle, power is stopped to the coil 33. Without the magnetic field formed by the coil 33, the compressed elastic element 36 will bounce the moving body 34 back to its original initial position. The end of the support rod 35 connected to the light-emitting chip 22 will descend, and the light-emitting chip 22 will also descend to its original initial position, thereby increasing the light-emitting angle of the light-emitting chip 22 and enabling the display device to achieve the wide viewing angle display function.

[0048] The lifting device 3 allows for free adjustment of the light-emitting angle of the light-emitting chip 22 in the second region 212, thereby enabling free switching between wide and narrow viewing angles of the display device. The entire switching operation is convenient and quick. Since the movement of the moving body 34 is achieved by the magnetic field attraction generated after the coil 33 is energized, different currents can be supplied to the coil 33. As a result, the distance that the magnetic field generated by the coil 33 attracts the moving body 34 to move on the track 32 will also be different. Consequently, the height at which the support rod 35 supports the end of the light-emitting chip 22 away from the first region 211 will also be different. This allows for adjustment of the light-emitting angle of the light-emitting chip 22 within a wider range, resulting in a larger narrow viewing angle range for the display device, which can meet the viewing angle requirements of the display device in more different situations.

[0049] In some embodiments, the magnetic field generated when the coil 33 is energized has a magnetic field that is opposite to that of the moving body 34. That is, when the magnetic field generated when the coil 33 is energized is positive, a moving body 34 with negative magnetic field is provided; if the magnetic field generated when the coil 33 is energized is negative, a moving body 34 with positive magnetic field is provided. Since opposite magnetic fields attract each other, the magnetic field generated when the coil 33 is energized will attract the moving body 34 to move towards the coil 33.

[0050] It should be noted that the aforementioned elastic element 36 can be a spring. When the light-emitting direction of the light-emitting chip 22 in the second region 212 is towards the light outlet 100, the moving body 34 is in its initial position, at which time the spring is in its initial state, i.e., uncompressed. In this embodiment, one end of the support rod 35 is rotatably connected to the moving body 34, and the other end is connected to the side surface of the light-emitting chip 22 near the substrate 21. To simplify the installation process, the support rod 35 and the light-emitting chip 22 can be made into an integral structure, that is, the light-emitting chip 22 has its own support rod 35, and the support rod 35 can rotate relative to the light-emitting chip 22. The connection position between the support rod 35 and the light-emitting chip 22 can be located at any position on the side surface of the light-emitting chip 22 near the substrate 21. However, it should be considered that the length of the support rod 35 must be able to meet the requirement that the light-emitting direction of the light-emitting chip 22 after it is supported is perpendicular to the light-emitting direction of the light-emitting chip 22 in the first region 211. The length of the corresponding track 32 and the length of the elastic element 36 must also match accordingly.

[0051] The support 31 of the lifting device 3 can be a square frame. The track 32 is set on the bottom inner side of the square frame, and the light-emitting chip 22 is set on the top of the support 31. It should be noted that the width of the light-emitting chip 22 is greater than the width of the square frame in the width direction. In this way, when the moving body 34 is in the initial position, the light-emitting chip 22 can be placed on the top of the support 31, so that the light-emitting direction of the light-emitting chip 22 in the first area 211 and the second area 212 is facing the light outlet 100, and the display device realizes the wide viewing angle display function.

[0052] For example, the support rod 35 can be connected to the light-emitting chip 22 at the center of the surface of the light-emitting chip 22 closest to the substrate 21. In this case, the length of the support rod 35 must be greater than half the length of the light-emitting chip 22 to ensure that the light-emitting direction of the support rod 35 after supporting the light-emitting chip 22 is perpendicular to the light-emitting direction of the light-emitting chip 22 in the first region 211. Alternatively, the support rod 35 can be connected to the light-emitting chip 22 at a position slightly closer to the first region 211 than the center of the surface of the light-emitting chip 22 closest to the substrate 21. In this case, the length of the support rod 35 can be less than half the length of the light-emitting chip 22. Simultaneously, the lengths of the track 32 and the elastic element 36 can be shortened, reducing the size of the lifting device 3 and saving manufacturing costs.

[0053] In some embodiments, reference Figures 2-4 The track 32 includes multiple cylindrical rods 320 arranged along a first direction; the first direction is either row direction X or column direction Y; the movable body 34 is spherical, and the moving direction of the movable body 34 is parallel to the first direction. This allows the movable body 34 to move smoothly on the track 32, and the position of the movable body 34 between adjacent cylindrical rods 320 also provides a certain degree of positioning, ensuring that the height of the light-emitting chip 22 supported by the support rod 35 remains constant, the light-emitting angle of the light-emitting chip 22 remains constant, and the narrow viewing angle of the display device meets the user's needs without fluctuation.

[0054] It should be noted that in the second region 212, the multiple cylindrical rods 320 of the track 32 of the lifting device 3 corresponding to the light-emitting chips 22 on both sides of each row of light-emitting chips 22 in the first region 211 are arranged along the row direction X. In this way, the light-emitting chips 22 on both sides of each row of light-emitting chips 22 in the first region 211 can tilt towards the first region 211, that is, the light-emitting direction of the light-emitting chips 22 is tilted towards the first region 211, thereby reducing the light-emitting angle. Similarly, in the second region 212, the multiple cylindrical rods 320 of the track 32 of the lifting device 3 corresponding to the light-emitting chips 22 on both sides of each column of light-emitting chips 22 in the first region 211 are arranged along the column direction Y. In this way, the light-emitting chips 22 on both sides of each column of light-emitting chips 22 in the first region 211 can tilt towards the first region 211, that is, the light-emitting direction of the light-emitting chips 22 is tilted towards the first region 211, thereby reducing the light-emitting angle.

[0055] By setting the movable body 34 to a spherical shape, the outer surface of the movable body 34 and the outer surface of the cylindrical arrangement rod 320 are in smooth contact. When the magnetic field generated by the coil 33 attracts the movable body 34 to move on the track 32, there is no friction between the movable body 34 and the cylindrical arrangement rod 320. This facilitates the smooth movement of the movable body 34 towards the coil 33 on the track 32. When it moves to a distance that the magnetic field generated by the coil 33 can attract, the movable body 34 will be stuck between two adjacent cylindrical arrangement rods 320. This keeps the position of the movable body 34 unchanged, and the light emission angle of the light-emitting chip 22 will also remain unchanged. This helps to prevent fluctuations in the narrow viewing angle width of the display device during use and improves the narrow viewing angle display effect.

[0056] Since the movable body 34 needs to be positioned between two adjacent cylindrical rods 320 to fix its position, the dimensions of the movable body 34, the dimensions of the cylindrical rods 320, and the arrangement distance of the cylindrical rods 320 are all important.

[0057] In some embodiments, reference Figures 2-4 Multiple arrangement rods 320 are spaced apart, and the distance between two adjacent arrangement rods 320 is equal; the diameter of the moving body 34 is greater than the distance between two adjacent arrangement rods 320. In this way, the moving body 34 will move on the arrangement rods 320 and will contact two adjacent arrangement rods 320, but will not be on the same horizontal plane as the arrangement rods 320. This avoids the arrangement rods 320 blocking the moving body 34 from moving towards the coil 33 when the moving body 34 is located between two arrangement rods 320.

[0058] In some embodiments, reference Figure 3 When the movable body 34 is located between two adjacent arrangement rods 320, the perpendicular lines connecting the center of the movable body 34 to the central axis of the two adjacent arrangement rods 320 form an angle A, which is greater than or equal to 45°. This ensures that the movable body 34 can be locked between the two adjacent arrangement rods 320, thus fixing the position of the movable body 34.

[0059] It should be noted that setting the included angle A to be greater than or equal to 45° means that at least one-quarter of the spherical movable body 34 is located between two adjacent arrangement rods 320. This avoids the situation where a very small portion of the spherical movable body 34 is located between two adjacent arrangement rods 320, and when the position of the movable body 34 needs to be fixed, the obstruction height of the arrangement rods 320 on the movable body 34 is extremely low, making it easy for the movable body 34 to move on the track 32 and unable to remain stationary. In this application, when setting the movable body 34 and the arrangement rods 320, both conditions must be met simultaneously: the diameter of the movable body 34 must be greater than the distance between two adjacent arrangement rods 320, and the included angle A formed by the perpendicular lines connecting the center of the movable body 34 to the central axes of the two adjacent arrangement rods 320 must be greater than or equal to 45°. Only then can the movable body 34 move smoothly towards the coil 33 on the track 32 and be able to be fixed in position between two adjacent arrangement rods 320, thereby fixing the light emission direction of the light-emitting chip 22.

[0060] In some embodiments, reference Figures 2-3 The bracket 31, track 32 and moving body 34 are all made of conductive materials; the light-emitting chip 22 is disposed on the top of the bracket 31 and is rotatably connected to the end of the top of the bracket 31 near the first region 211; the substrate 21 is provided with a pad 4, and the bracket 31 is soldered to the pad 4.

[0061] In this embodiment, the lifting device 3 is disposed between the light-emitting chip 22 and the substrate 21. The light-emitting chip 22 needs to be electrically connected to the substrate 21 to realize the light-emitting function. Therefore, the bracket 31, the track 32 and the moving body 34 are all made of conductive materials. In this way, the lifting device 3 is conductive. When the light-emitting chip 22 is connected to the lifting device 3, the lifting device 3 is connected to the substrate 21 through the solder pad 4, which is equivalent to indirectly electrically connecting the light-emitting chip 22 and the substrate 21 together.

[0062] It should be noted that multiple pads 4 are provided on the substrate 21, and the side of the support 31 is connected to the pads 4. This not only allows the support 31 to be electrically connected to the substrate 21 through the pads 4, but also allows the support 31 to be stably placed on the substrate 21. As a result, the moving body 34 can only move under the attraction of the magnetic field generated by the coil 33. When the coil 33 is not energized, the moving body 34 will remain stationary at the initial position.

[0063] The light-emitting chip 22 is rotatably connected to the top end of the bracket 31 near the first region 211. That is, the bottom end of the light-emitting chip 22 near the first region 211 is rotatably connected to the top end of the bracket 31 near the first region 211. The bottom end of the light-emitting chip 22 away from the first region 211 is a free end, which is placed on the top of the bracket 31. When the moving body 34 moves toward the coil 33 on the track 32, the support rod 35 can lift the end of the light-emitting chip 22 away from the first region 211, thereby changing the light emission direction of the light-emitting chip 22, reducing the light emission angle, and realizing the narrow viewing angle display function of the display device. One specific implementation of the rotatable connection between the light-emitting chip 22 and the top end of the bracket 31 near the first region 211 is to provide a connecting rod on the top side of the bracket 31 near the first region 211. The extension direction of the connecting rod is parallel to the width direction of the bracket 31, and the length of the connecting rod is greater than or equal to the width of the light-emitting chip 22. The bottom end of the light-emitting chip 22 near the first region 211 is connected to the connecting rod via a rotating connector, thereby achieving the rotatable connection between the light-emitting chip 22 and the bracket 31. Alternatively, the rotatable connection between the light-emitting chip 22 and the top end of the bracket 31 near the first region 211 can also be achieved by providing rotating connectors at both the top end of the bracket 31 near the first region 211 and the bottom end of the light-emitting chip 22 near the first region 211, and connecting these rotating connectors together.

[0064] In some embodiments, the angle range of the light-emitting chip 22 rotating relative to the support 31 toward the first region 211 is 0°-90°. This allows for a wider range of light emission angles of the light-emitting chip 22, thereby increasing the narrow viewing angle range of the display device and meeting people's requirements for narrow viewing angles in more and more different situations.

[0065] In some embodiments, reference Figures 5-6 The second region 212 includes two columns of light-emitting chips 22 located on both sides of the first region 211 along the row direction X, and two rows of light-emitting chips 22 located on both sides of the first region 211 along the column direction Y.

[0066] That is, a ring of light-emitting chips 22 is distributed around the first region 211. If two or more rings of light-emitting chips 22 are distributed around the first region 211, then when all the light-emitting chips 22 are tilted, the light-emitting chips 22 closer to the first region 211 will block the light emitted by the light-emitting chips 22 farther away from the first region 211, thereby affecting the brightness of the entire light source assembly 2. When only the light-emitting chips 22 closer to the first region 211 are tilted, and the other light-emitting chips 22 remain unchanged, it is equivalent to the light-emitting chips 22 that remain unchanged when changing the narrow viewing angle not playing a role, wasting resources, and affecting the display effect of the narrow viewing angle. Therefore, this application sets a ring of light-emitting chips 22 around the first region 211. When changing the narrow viewing angle, all the light-emitting chips 22 in the second region 212 will tilt, and each light-emitting chip 22 on the substrate 21 will emit light, which can ensure that the brightness of the light source assembly 2 meets the requirements, and the display effect of both narrow and wide viewing angles can be improved.

[0067] In some embodiments, the coils 33 of the lifting devices 3 connected to the multiple light-emitting chips 22 located in the same row in the second region 212 are connected together. When the coils 33 are energized, the lifting devices 3 corresponding to the multiple light-emitting chips 22 located in the same row will lift the multiple light-emitting chips 22 simultaneously, which can ensure that the light emission direction tilt angle of the multiple light-emitting chips 22 in the same row is consistent, thus making the narrow viewing angle of the display device more effective.

[0068] In some embodiments, the coils 33 of the lifting devices 3 connected to the multiple light-emitting chips 22 located in the same column in the second region 212 are connected together. When the coils 33 are energized, the lifting devices 3 corresponding to the multiple light-emitting chips 22 located in the same column will lift the multiple light-emitting chips 22 simultaneously, which can ensure that the light emission direction tilt angle of the multiple light-emitting chips 22 in the same column is consistent, thus making the narrow viewing angle of the display device more effective.

[0069] In some embodiments, the coils 33 of the lifting device 3 connected to multiple light-emitting chips 22 located in the same row in the second region 212 are connected together, and the coils 33 of the lifting device 3 connected to multiple light-emitting chips 22 located in the same column in the second region 212 are connected together. This allows for rapid simultaneous lifting or lowering of the light-emitting chips 22 in the same row and the same column, quickly switching between wide and narrow viewing angles.

[0070] It should be noted that the coils 33 of all the lifting devices 3 in the second area 212 are connected together, so that all the moving bodies 34 can be controlled to move the same distance at the same time. This allows all the light-emitting chips 22 in the second area 212 to be raised or lowered at the same height at the same time, which is conducive to quickly and conveniently switching between wide and narrow viewing angles. Moreover, it can make the width adjustment of the narrow viewing angle more accurate, meeting people's requirements for narrow viewing angles in different situations.

[0071] Example 2

[0072] refer to Figure 7 Embodiment 2 of this application provides a display device, including a backlight module 200 and a display panel 300 as described in any of the above embodiments, wherein the display panel 300 is disposed on the light-emitting side of the backlight module 200.

[0073] The detailed structure of the backlight module 200 can be referred to the above embodiments, and will not be repeated here. It is understood that since the backlight module 200 is used in the display device of this application, the embodiments of the display device of this application include all the technical solutions of all the embodiments of the backlight module 200, and can achieve the technical effects achieved by the above technical solutions.

[0074] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A backlight module, comprising a support shell (1) having a receiving cavity (10), and a light source assembly (2) disposed within the receiving cavity (10), the receiving cavity (10) having a light outlet (100), the receiving cavity (10) comprising a bottom wall (101) and a side wall (102), the bottom wall (101) being disposed opposite to the light outlet (100), characterized in that, The light source assembly (2) includes a substrate (21) and light-emitting chips (22) arranged in multiple rows and columns on the substrate (21), and the substrate (21) is disposed on the bottom wall (101). The substrate (21) includes a first region (211) located at the center of the substrate (21) and a second region (212) surrounding the first region (211). A lifting device (3) is provided between each of the light-emitting chips (22) in the second region (212) and the substrate (21). The lifting device (3) is used to lift or lower the end of the light-emitting chip (22) away from the first region (211). The lifting device (3) includes a bracket (31), a track (32) connected to the bottom of the bracket (31), a coil (33) disposed on the side of the track (32) near the first region (211), a movable body (34) disposed on the track (32), and a support rod (35). The movable body (34) is connected to the bracket (31) through an elastic member (36). One end of the support rod (35) is rotatably connected to the movable body (34), and the other end is rotatably connected to the surface of the light-emitting chip (22) near the substrate (21). The coil (33) is used to generate a magnetic field when energized to attract the moving body (34) to move on the track (32) toward the coil (33), so that the support rod (35) lifts the end of the light-emitting chip (22) away from the first region (211); The elastic element (36) is used to push the movable body (34) away from the coil (33) when the coil (33) is de-energized, so that the support rod (35) lowers the end of the light-emitting chip (22) away from the first region (211); The track (32) includes a plurality of cylindrical rods (320) arranged along a first direction; the first direction is either a row direction (X) or a column direction (Y). The moving body (34) is spherical, and the moving direction of the moving body (34) is parallel to the first direction; The plurality of the arrangement rods (320) are spaced apart, and the distance between two adjacent arrangement rods (320) is equal; the diameter of the moving body (34) is greater than the distance between two adjacent arrangement rods (320); When the moving body (34) is located between two adjacent arrangement rods (320), the vertical lines connecting the center of the ball of the moving body (34) to the central axis of the two adjacent arrangement rods (320) form an angle (A), and the angle (A) is greater than or equal to 45°.

2. The backlight module according to claim 1, characterized in that, The magnetic field generated when the coil (33) is energized is different from the magnetic field of the moving body (34).

3. The backlight module according to claim 1, characterized in that, The bracket (31), the track (32), and the moving body (34) are all made of conductive materials; The light-emitting chip (22) is disposed on the top of the bracket (31), and the light-emitting chip (22) is rotatably connected to one end of the top of the bracket (31) near the first region (211); The substrate (21) is provided with pads (4), and the bracket (31) is welded to the pads (4); And / or, the angle range of the light-emitting chip (22) rotating relative to the bracket (31) toward the first region (211) is 0°-90°.

4. The backlight module according to claim 1, characterized in that, The second region (212) includes two columns of light-emitting chips (22) located on both sides of the first region (211) along the row direction (X), and two rows of light-emitting chips (22) located on both sides of the first region (211) along the column direction (Y).

5. The backlight module according to claim 4, characterized in that, The coils (33) of the lifting device (3) connected to the multiple light-emitting chips (22) located in the same row in the second region (212) are connected together; And / or, the coils (33) of the lifting device (3) to which multiple light-emitting chips (22) located in the same column in the second region (212) are connected together.

6. A display device, characterized in that, include: The backlight module (200) as described in any one of claims 1-5; The display panel (300) is located on the light-emitting side of the backlight module (200).

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