LED structure, LED lamp bead and backlight source

Abstract

Disclosed in the present application are an LED structure, an LED lamp bead and a backlight source. The LED structure comprises a light-emitting assembly and a light emission control assembly that are stacked, wherein the light emission control assembly is configured to control the divergence angle of a first emergent light ray from the light-emitting assembly, so that the divergence angle of the first emergent light ray changes from a first angle to a second angle.

Description

An LED structure, LED chips and backlight

[0001] This application claims priority to Chinese Patent Application No. 202411226879.1, filed on August 30, 2024, entitled "An LED Structure, LED Beads and Backlight", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of light source technology, specifically to an LED lamp bead structure and a light source module. Background Technology

[0003] LED chips are widely used as light sources in display products. However, the light emitted by the chips has extended light source characteristics and Lambertian characteristics, which cannot directly meet the needs of backlight applications. Moreover, optical shaping of them is very difficult. Therefore, in actual backlight systems, complex devices such as lenses, reflectors, reflector cups, and diffuser films are required to control the divergence angle of the light source. Technical issues

[0004] Chip-based light emission exhibits extended light source characteristics and Lambertian properties, which cannot directly meet the needs of backlight applications. Furthermore, optical shaping of the light source is extremely difficult. Therefore, practical backlight systems require complex lenses, reflectors, reflector cups, and diffuser films to control the light source divergence angle. The presence of these components significantly increases the complexity and cost of the backlight system. Technical solutions

[0005] This application provides an LED structure, LED beads, and backlight that can effectively adjust the divergence angle of the light source to simplify the backlight structure and reduce costs.

[0006] This application provides an LED structure, including a light-emitting component and a light-emitting control component stacked together;

[0007] The light emission control component is used to control the divergence angle of the first emitted light from the light-emitting component, so that the divergence angle of the first emitted light is changed from a first angle to a second angle.

[0008] In some embodiments of the LED structure, the second angle is smaller than the first angle.

[0009] In some embodiments of the LED structure, the light emission control component is used to control the transmission of the first emitted light rays with an incident angle within a preset angle range.

[0010] In some embodiments of the LED structure, the light emission control component includes a plurality of stacked optical thin film layers, and the refractive indices of adjacent optical thin film layers are different.

[0011] In some embodiments of the LED structure, the light emission control component includes a first film layer and a second film layer stacked together, wherein the refractive indices of the first film layer and the second film layer are different.

[0012] In some embodiments of the LED structure, the light emission control component includes a plurality of alternatingly stacked first and second film layers, wherein the refractive indices of the first and second film layers are different.

[0013] In some embodiments of the LED structure, the light emission control component includes a first microstructure layer.

[0014] In some embodiments of the LED structure, the first microstructure layer includes a plurality of microstructures arranged in an array.

[0015] In some embodiments of the LED structure, the first microstructure layer includes a plurality of microstructures, wherein the plurality of microstructures are nanostructures.

[0016] In some embodiments of the LED structure, multiple microstructures are arranged in a rectangular array, and the center distance between two adjacent microstructures is less than the wavelength of the first emitted light.

[0017] In some embodiments of the LED structure, multiple microstructures are arranged in a concentric circle array, and the interval between two adjacent concentric circles is smaller than the wavelength of the first emitted light.

[0018] In some embodiments of the LED structure, the LED structure further includes a light-emitting shaping component, which is stacked on the light-emitting control component;

[0019] The light-emitting shaping component is used to shape the second emitted light beam after it has been processed by the light-emitting control component.

[0020] In some embodiments of the LED structure, the light-emitting shaping component includes a grating structure.

[0021] In some embodiments of the LED structure, the light-emitting shaping component includes a second microstructure layer.

[0022] In some embodiments of the LED structure, the light emission control component includes a second microstructure layer; the second microstructure layer includes a plurality of microstructures arranged in an array.

[0023] In some embodiments of the LED structure, the second microstructure layer includes a plurality of microstructures, the microstructures being cylindrical, prismatic, hemispherical, or pyramidal in shape.

[0024] In some embodiments of the LED structure, the second microstructure layer includes multiple microstructures, including multiple microstructure nanostructures.

[0025] In some embodiments, the LED beads include the LED structure described above.

[0026] This application embodiment also provides a backlight source, which includes a plurality of LED structures as described above. Beneficial effects

[0027] This application provides an LED structure and a backlight. The LED structure includes a light-emitting component and a light-emitting control component stacked on top of each other. The light-emitting control component controls the divergence angle of the first emitted light from the light-emitting component, changing the divergence angle from a first angle to a second angle to meet the requirements of backlight applications. This application directly adds a light-emitting control component to a single LED chip to form a single LED structure, enabling control of the light-emitting divergence angle of the light-emitting component and ensuring that the light emitted by the LED structure meets the requirements of backlight display. Furthermore, when using this LED structure to form a backlight, there is no need to add additional structural layers such as lenses, reflectors, and diffusion films, thus simplifying the backlight structure and reducing costs. Attached Figure Description

[0028] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0029] Figure 1 is a schematic diagram of the first embodiment of the LED structure provided in this application.

[0030] Figure 2 is a schematic diagram of the first embodiment of the light emission control component in the LED structure provided in this application.

[0031] Figure 3 is a schematic diagram showing the relationship between the incident angle of light and the transmittance in the light emission control component of the LED structure provided in the embodiment of this application.

[0032] Figure 4 is a schematic diagram showing the relationship between the incident angle of light and the energy of emitted light in the light emission control component of the LED structure provided in the embodiment of this application.

[0033] Figure 5 is a schematic diagram of optical interference in the optical thin film layer of the LED structure provided in the embodiment of this application.

[0034] Figure 6 is a schematic diagram of the light rays in Figure 2 provided in an embodiment of this application.

[0035] Figure 7 is a schematic diagram of the second embodiment of the light emission control component in the LED structure provided in this application.

[0036] Figure 8 is a schematic diagram of multiple microstructures arranged in a rectangular array in the LED structure provided in the embodiment of this application.

[0037] Figure 9 is a schematic diagram of multiple microstructures arranged in a concentric circle array in the LED structure provided in the embodiment of this application.

[0038] Figure 10 is a schematic diagram of the third embodiment of the light emission control component in the LED structure provided in this application.

[0039] Figure 11 is a schematic diagram of the light rays in Figure 10 provided in an embodiment of this application.

[0040] Figure 12 is a schematic diagram of the second embodiment of the LED structure provided in this application.

[0041] Figure 13 is a schematic diagram of the first embodiment of the light-emitting shaping component in the LED structure provided in this application.

[0042] Figure 14 is a partial top view of the second embodiment of the light-emitting shaping component in the LED structure provided in this application.

[0043] Figure 15 is a partial three-dimensional structural schematic diagram of the second embodiment of the light-emitting shaping component in the LED structure provided in this application.

[0044] Figure 16 is a schematic diagram of the third embodiment of the light-emitting shaping component in the LED structure provided in this application.

[0045] Figure 17 is a schematic diagram of the light rays in Figure 15 provided in an embodiment of this application.

[0046] Figure 18 is a schematic diagram of the fourth embodiment of the light-emitting shaping component in the LED structure provided in this application.

[0047] Figure 19 is a schematic diagram of the light rays in Figure 18 provided in an embodiment of this application.

[0048] Figure 20 is a schematic diagram of the backlight provided in an embodiment of this application.

[0049] Reference numerals: 11, light-emitting component; 12, light-emitting control component; 121, optical thin film layer; 13, light-emitting shaping component; 10, substrate; 20, LED structure. Detailed Implementation

[0050] 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 scope of protection of this application.

[0051] 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. Features thus defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] Please refer to Figure 1. This embodiment provides an LED structure, which includes a stacked light-emitting component 11 and a light-emitting control component 12. The light-emitting control component 12 is used to control the divergence angle of the first emitted light from the light-emitting component 11, so that the divergence angle of the first emitted light is changed from a first angle to a second angle, so as to meet the requirements of backlight applications.

[0053] In this embodiment, a light emission control component 12 is directly added to a single LED chip to form a single LED structure. This enables control over the light emission divergence angle of the light-emitting component 11, ensuring that the light emitted by the LED structure meets the requirements for backlight display. When using this LED structure to form a backlight, there is no need to add additional structural layers such as lenses, reflectors, and diffusion films, thereby simplifying the backlight structure and reducing costs.

[0054] At the same time, by using this LED structure to form a backlight, the use of additional lenses, reflectors and diffusion film layers can be reduced, which can avoid the absorption or reflection of light energy by the film layer on the LED structure, thereby reducing light energy loss, improving light utilization, reducing power consumption and improving luminous efficiency.

[0055] In some embodiments, the light emission control component 12 is used to reduce the divergence angle of the first emitted light, that is, the second angle in this embodiment is smaller than the first angle. For example, the divergence angle of the first emitted light emitted by the light-emitting component 11 is [-45°, 45°], and after passing through the light emission control component 12, the emission angle of the first emitted light can be reduced to [-15°, 15°]. In this embodiment, by setting the light emission control component 12 to adjust the divergence angle of the first emitted light, it is beneficial to alleviate the display problems caused by the light emission extension characteristics and Lambertianity of the LED component.

[0056] In some embodiments, the light emission control component 12 is used to control the transmission of the first emitted light rays with an incident angle within a preset angle range. For example, the preset angle range can be 15° to 35°, or it can be less than 15°. That is, in this embodiment, the light emission control component 12 can reduce the transmittance as the incident angle increases. Therefore, when the incident angle of the first emitted light rays from the light-emitting component 11 exceeds the preset angle range, it cannot pass through the light emission control component 12. Thus, the light emission control component 12 can filter out the first emitted light rays with large incident angles, thereby controlling the divergence angle of the first emitted light rays.

[0057] Referring to Figure 2, as one embodiment, the light emission control component 12 includes multiple stacked optical thin film layers 121, and the refractive indices of adjacent optical thin film layers 121 are different, resulting in a film layer whose transmittance decreases as the incident angle increases. For example, as shown in Figure 3, the transmittance drops sharply when the incident angle is greater than 10°, while the transmittance is close to 100% when the incident angle is less than 10°. Correspondingly, as shown in Figure 4, the smaller the absolute value of the incident angle of the light, the higher the energy of the emitted light through the light emission control component 12; the energy of the emitted light is higher when the incident angle is between -10° and 10°. Thus, in this embodiment, the divergence angle of the first emitted light is controlled by depositing multiple optical thin film layers 121. The materials of adjacent optical thin film layers 121 in the multiple optical thin film layers 121 are different, resulting in different refractive indices between adjacent optical thin film layers 121. That is, multiple optical thin film layers 121 made of different materials can exist in the multiple optical thin film layers 121.

[0058] Referring to Figures 5 and 6, in this embodiment, the thickness of each optical thin film layer 121 can be adjusted so that incident light rays at small angles interfere constructively, increasing transmittance and allowing all light to pass through; while incident light rays at large angles interfere destructively, decreasing transmittance and causing all light to be reflected. Therefore, for the first outgoing light rays with large divergence angles, only those with incident angles within a preset angle range, such as less than 15°, can pass through after passing through multiple optical thin film layers 121, thus reducing the divergence angle.

[0059] As one embodiment, the light emission control component 12 may also include multiple alternating layers of first and second films, wherein the refractive indices of the first and second films are different. That is, in this embodiment, the light emission control component 12 is provided with only two optical thin film layers 121 made of two different materials, and the two different optical thin film layers 121 are alternately stacked in multiple layers.

[0060] In another embodiment, the light emission control component 12 includes a first film layer and a second film layer stacked together, wherein the refractive indices of the first film layer and the second film layer are different. That is, in this embodiment, the light emission control component 12 is provided with only two optical thin film layers 121 made of two different materials, with one layer of each type of optical thin film layer 121.

[0061] Please refer to Figure 7. In this embodiment, the thickness of the optical thin film layers can all be nanometer-scale, for example, the thickness of the optical thin film layer is subwavelength. Using nanometer-scale film layers, the interference and diffraction effects of light can be effectively modulated. Specifically, for multiple film layers, the thickness of each film layer can be precisely adjusted so that incident light rays within a specific angle range interfere constructively, increasing transmittance, while incident light rays within other angle ranges interfere destructively, decreasing transmittance, and being completely reflected. Therefore, for the first outgoing light rays with a large divergence angle, only those with an incident angle within a preset angle range, such as 15° to 35°, can pass through after passing through multiple optical thin film layers 121, thereby achieving the control of a specific divergence angle.

[0062] In another embodiment, the light emission control component 12 includes a first microstructure layer, which comprises multiple microstructures. The microstructures are cylindrical, prismatic, hemispherical, or pyramidal in shape. In this embodiment, the shapes of the multiple microstructures in the first microstructure layer can all be identical; that is, all microstructures in the first microstructure layer can be cylindrical or prismatic. Of course, the multiple microstructures in the first microstructure layer can have various combinations of different shapes; that is, some microstructures in the first microstructure layer can be cylindrical, while others can be prismatic. This application does not specifically limit this. In this embodiment, the maximum center distance between the microstructures is less than the wavelength of the emitted light from the light-emitting component 11, and the dimensions of each corresponding microstructure are smaller than the wavelength of the emitted light from the light-emitting component 11, in order to reduce the light emission divergence angle and achieve control over the divergence angle.

[0063] In some embodiments, the first microstructure layer includes multiple microstructures arranged in an array. For example, the multiple microstructures can be arranged in a rectangular array or in a concentric circular array, and each microstructure has the same shape and size. Taking a cylindrical shape as an example: As shown in Figure 8, the multiple microstructures in the first microstructure layer are arranged in a rectangular array, where p1 and p2 represent the center distance between two columns of microstructures. As shown in Figure 9, the multiple microstructures in the first microstructure layer are arranged in a concentric circular array, where p3 is the interval between the microstructure located at the center of the concentric circle and the adjacent concentric circle, and p4 is the interval between the second and third concentric circles.

[0064] In one embodiment, multiple microstructures are arranged in a rectangular array, with the center-to-center distance between two adjacent microstructures being less than the wavelength of the first emitted light; for example, this center-to-center distance is one-half or one-third of the wavelength. As shown in Figure 8, the center-to-center distance between two adjacent microstructures is shown as p1 and p2 in Figure 8. Multiple microstructures are arranged in an array, with p1 and p2 being equal and less than the wavelength of the first emitted light. If the emitted light from the LED structure is blue light, then the wavelength of the first emitted light is the blue light wavelength; if the emitted light from the LED structure is red light, then the wavelength of the first emitted light is the red light wavelength.

[0065] As one embodiment, multiple microstructures are arranged in a concentric circle array, with the interval between two adjacent concentric circles being smaller than the wavelength of the first emitted light; for example, this interval is one-half or one-third of the wavelength. As shown in Figure 9, the interval between two adjacent concentric circles is shown as p3 and p4 in Figure 9, where p3 and p4 are equal and smaller than the wavelength of the first emitted light. Similarly, if the emitted light from the LED structure is blue light, then the wavelength of the first emitted light is the blue light wavelength; if the emitted light from the LED structure is red light, then the wavelength of the first emitted light is the red light wavelength.

[0066] In this embodiment, multiple microstructures are arranged in an array, forming a certain arrangement period between them. As shown in Figures 10 and 11, taking a cylindrical microstructure array as an example, this embodiment can precisely control the arrangement period p0 in Figure 10, or the size of each cylinder, such as its height or radius, to regulate the array's response at different incident angles at specific wavelengths. Specifically, at small incident angles, the resonant transmission condition of the subwavelength unit periodic structure is satisfied, achieving high transmittance. At large incident angles, the resonant transmission condition cannot be satisfied, resulting in very low transmittance. Therefore, when the first outgoing light with a large divergence angle passes through this microstructure array, only incident angles within a preset angle range, such as less than 15°, can pass through, thereby reducing the divergence angle.

[0067] As one embodiment, the second microstructure layer includes multiple microstructures, all of which are nanoscale microstructures; that is, all microstructures in the first microstructure layer are nanoscale microstructures. Taking a cylindrical array structure as an example, the cylindrical structures in the first microstructure layer are all nanoscale microstructures. In this embodiment, by setting the microstructures to be nanoscale structures with dimensions at the same level as the wavelength, a more significant effect on light emission modulation is ensured.

[0068] Please refer to Figure 12. In some embodiments, the LED structure further includes a light-emitting shaping component 13, which is stacked on the light-emitting control component 12. The light-emitting shaping component 13 is used to shape the second emitted light after it has been processed by the light-emitting control component 12, so as to improve the uniformity of light emission.

[0069] In this embodiment, the light-emitting shaping component 13 shapes the second emitted light beam to achieve beam shaping and improve light emission uniformity. Specifically, in this embodiment, by setting the light-emitting shaping component 13 to adjust the light spot uniformity of the LED structure, the shape of the light spot can be adjusted. For example, a square light spot can be converted into a circular light spot. Alternatively, the divergence angle of the second emitted light beam can be finely adjusted based on the light emission control component 12, for example, the divergence angle of the second emitted light beam can be finely adjusted from 15° to 18°.

[0070] As one embodiment, the light-emitting shaping component 13 includes a grating structure, as shown in Figure 13. This grating structure can be a symmetrical planar annular grating structure, comprising multiple annular sub-gratings. The width of each sub-grating can be different, and they are not arranged in a regular pattern, thus forming a non-periodic grating structure. As shown in Figures 14 and 15, it can also be a non-axisymmetric grating structure; this application does not limit its application to this. When a non-periodic grating structure is used, the outgoing direction of incident light at each local location can be controlled, ultimately achieving overall diffusion and uniform light distribution of the incident light.

[0071] As one embodiment, the grating structure is a nano-grating structure. For a planar annular grating structure, the width of each annular sub-grating or the spacing between each annular sub-grating is nanometer-sized. For a non-axisymmetric three-dimensional grating structure, the three-dimensional grating structure is a nanometer-sized grating structure, thereby making it compatible with the wavelength level of the LED structure and improving the light output shaping effect.

[0072] In another embodiment, the light-emitting shaping component 13 includes a second microstructure layer; the second microstructure layer includes multiple microstructures, the shapes of which are cylindrical, prismatic, hemispherical, or pyramidal. In this embodiment, the shapes of the multiple microstructures in the second microstructure layer can all be the same, that is, all the multiple microstructures in the second microstructure layer are cylindrical or all are prismatic. Of course, the multiple microstructures in the second microstructure layer can have various combinations of different shapes, that is, some of the microstructures in the second microstructure layer are cylindrical and others are prismatic; this application does not specifically limit this.

[0073] In some embodiments, the second microstructure layer includes multiple microstructures arranged in an array. For example, the multiple microstructures can be arranged in a rectangular array or in a concentric circular array. If it is necessary to achieve the purpose of light spot uniformity by fine-tuning the divergence angle of the second emitted light, in this embodiment, the maximum center distance between the microstructures in the second microstructure layer can be greater than the wavelength of the emitted light from the light-emitting component 11, and the dimensions of each corresponding microstructure are greater than the wavelength of the emitted light from the light-emitting component 11 and less than the maximum center distance.

[0074] Please refer to Figures 16 and 17 together. In this embodiment, multiple microstructures are arranged in an array, forming a certain arrangement period between the microstructures, which gives the second microstructure layer diffraction characteristics. A beam of incident light at a specific angle can be diffracted to multiple angles, that is, multiple diffraction orders, after passing through the structural layer, presenting a wider angular range of light output, thus playing a diffusion role and uniformizing the light spot. At the same time, by precisely controlling the arrangement period or the size of the microstructures, the intensity of different diffraction orders can be controlled, further achieving the effect of diffused and uniform light.

[0075] In some embodiments, the microstructures in the second microstructure layer can vary in size. For example, in the cylindrical microstructure layer shown in Figure 18, the diameters of the cylinders vary, and the spacing between the cylinders also varies, presenting a non-periodic structural arrangement. In this embodiment, by controlling the outgoing direction of the incident light at each local cylinder position, the overall incident light diffusion and uniform light are ultimately achieved, as shown in Figure 19.

[0076] As one embodiment, multiple microstructures in the second microstructure layer are nanostructures; that is, all microstructures in the second microstructure layer are nanoscale microstructures. Taking a cylindrical array structure as an example, the cylindrical structures in the second microstructure layer are all nanoscale microstructures. In this embodiment, by setting the microstructures to be nanoscale structures with dimensions at the same level as the wavelength, a more significant effect on light shaping is ensured.

[0077] This application also provides an LED lamp bead, which includes a bracket structure and an LED structure disposed in the bracket structure. Since the LED structure has been described in detail above, it will not be repeated here.

[0078] Referring to Figure 20, this embodiment of the application also discloses a backlight source, which includes a substrate 10 on which a plurality of the aforementioned LED structures 20 are attached. Since each LED structure 20 is provided with a light emission control component and a light emission shaping component, the backlight source structure in this embodiment can eliminate the need for diffuser films, reflectors, or reflector cups, effectively simplifying the backlight source structure and manufacturing process, thereby reducing costs. Simultaneously, reducing the use of lenses, reflectors, and diffuser film layers can prevent the absorption or reflection of light energy from the LED structures 20 by the film layers, thereby reducing light energy loss and improving visual effects. Because lenses, reflectors, and diffuser films occupy a large volume and weight, reducing their presence simplifies the backlight source structure, reduces the overall volume and weight, and lowers manufacturing difficulty and cost.

[0079] 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 in other embodiments.

[0080] The LED structure provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An LED structure, wherein, This includes stacked light-emitting components and light-emitting control components; The light emission control component is used to control the divergence angle of the first emitted light from the light-emitting component, so that the divergence angle of the first emitted light is changed from a first angle to a second angle.

2. The LED structure according to claim 1, wherein, The second angle is smaller than the first angle.

3. The LED structure according to claim 1, wherein, The light emission control component is used to control the transmission of the first emitted light rays with an incident angle within a preset angle range.

4. The LED structure according to claim 1, wherein, The light emission control component includes multiple stacked optical thin film layers, and the refractive indices of adjacent optical thin film layers are different.

5. The LED structure according to claim 1, wherein, The light emission control component includes a first film layer and a second film layer stacked together, wherein the refractive indices of the first film layer and the second film layer are different.

6. The LED structure according to claim 1, wherein, The light emission control component includes multiple alternating layers of first and second films, wherein the refractive indices of the first and second films are different.

7. The LED structure according to claim 1, wherein, The light emission control component includes a first microstructure layer.

8. The LED structure according to claim 7, wherein, The first microstructure layer includes multiple microstructures, which are arranged in an array.

9. The LED structure according to claim 7, wherein, The first microstructure layer includes multiple microstructures, and the microstructures are cylindrical, prismatic, hemispherical, or pyramidal in shape.

10. The LED structure according to claim 7, wherein, The first microstructure layer includes multiple microstructures, and the multiple microstructures are nanostructures.

11. The LED structure according to claim 8, wherein, The microstructures are arranged in a rectangular array, and the center distance between two adjacent microstructures is less than the wavelength of the first emitted light.

12. The LED structure according to claim 8, wherein, The microstructures are arranged in a concentric circle array, and the interval between two adjacent concentric circles is less than the wavelength of the first emitted light.

13. The LED structure according to any one of claims 1-12, wherein, The LED structure also includes a light-emitting shaping component, which is stacked on the light-emitting control component; The light-emitting shaping component is used to shape the second emitted light beam after it has been processed by the light-emitting control component.

14. The LED structure according to claim 13, wherein, The light-emitting shaping component includes a grating structure.

15. The LED structure according to claim 13, wherein, The light-emitting shaping component includes a second microstructure layer.

16. The LED structure according to claim 13, wherein, The light-emitting shaping component includes a second microstructure layer, which includes multiple microstructures arranged in an array.

17. The LED structure according to claim 15, wherein, The second microstructure layer includes multiple microstructures, which are cylindrical, prismatic, hemispherical, or pyramidal in shape.

18. The LED structure according to claim 15, wherein, The second microstructure layer includes multiple microstructures, and the multiple microstructures are nanostructures.

19. An LED light bead, wherein, The LED structure includes a stacked light-emitting component and a light-emitting control component. The light emission control component is used to control the divergence angle of the first emitted light from the light-emitting component, so that the divergence angle of the first emitted light is changed from a first angle to a second angle.

20. A backlight source, wherein, It includes multiple LED structures, each of which includes stacked light-emitting components and light-emitting control components; The light emission control component is used to control the divergence angle of the first emitted light from the light-emitting component, so that the divergence angle of the first emitted light is changed from a first angle to a second angle.

Images