LED structure, LED lamp bead and backlight source

Abstract

The utility model discloses an LED structure, an LED lamp bead and a backlight source, and the LED structure comprises a light-emitting assembly and a scattering structure layer which are arranged in a laminated manner. The scattering structure layer is used for adjusting the divergence angle of first emergent light of the light-emitting assembly, so that the divergence angle of the first emergent light is converted into a second angle from a first angle; wherein the second angle is larger than the first angle. The light emitting divergence angle can be effectively enlarged, optical loss is reduced, and the lighting effect and the visual effect are improved.

Description

Technical Field

[0001] The present application relates to the field of light source technology, and in particular to an LED structure, an LED lamp bead and a backlight source. Background Art

[0002] The development of display screens towards larger sizes and thinner and lighter screens has put forward higher requirements on the backlight system. In order to use fewer LED chips and achieve a larger beam divergence angle at a shorter optical distance, the current backlight system uses devices such as total reflection lenses, reflective sheets and diffusion films to achieve this. However, the presence of large-volume lenses and reflective sheets increases optical loss, affecting the light and visual effects.

[0003] Therefore, the current technology still needs to be improved and enhanced. Utility Model Content

[0004] The present application provides an LED structure, LED lamp beads and backlight source, which can expand the light divergence angle of the LED structure, reduce optical loss, and improve lighting and visual effects.

[0005] The present application provides an LED structure, including a light-emitting component and a scattering structure layer arranged in a stacked manner; the scattering structure layer is used to adjust the divergence angle of a first emergent light of the light-emitting component, so that the divergence angle of the first emergent light is converted from a first angle to a second angle; wherein the second angle is greater than the first angle.

[0006] In some embodiments of the LED structure, the scattering structure layer includes a first microstructure layer.

[0007] In the LED structure of some embodiments, the first microstructure layer includes a plurality of microstructures, and the plurality of microstructures are arranged in an array.

[0008] In the LED structure of some embodiments, the first microstructure layer includes a plurality of microstructures, and the shapes of the microstructures are cylindrical, prism-shaped, hemispherical, or pyramidal.

[0009] In the LED structure of some embodiments, the first microstructure layer includes a plurality of microstructures, and the plurality of microstructures are nano-microstructures.

[0010] In the LED structure of some embodiments, the plurality of microstructures are arranged in a rectangular array, and the center distance between two adjacent microstructures is greater than the wavelength of the first emitted light.

[0011] In the LED structure of some embodiments, the plurality of microstructures are arranged in a concentric circle array, and the interval between two adjacent concentric circles is greater than the wavelength of the first emitted light.

[0012] In some embodiments of the LED structure, the LED structure further includes a reflective structure layer, and the reflective structure layer is stacked on the scattering structure layer;

[0013] Wherein, the reflection structure layer is configured to reflect at least part of the second emitted light rays emitted from the scattering structure layer back to the scattering structure layer;

[0014] The scattering structure layer is further configured to scatter the light rays reflected by the reflection structure layer again.

[0015] In the LED structure of some embodiments, the reflection structure layer includes a plurality of optically thin film layers stacked, and the refractive indices of two adjacent optically thin film layers are different.

[0016] In the LED structure of some embodiments, the reflection structure layer includes a first film layer and a second film layer alternately stacked, and the refractive index of the first film layer is different from that of the second film layer.

[0017] In the LED structure of some embodiments, the reflection structure layer includes a first film layer and a second film layer stacked, and the refractive index of the first film layer is different from that of the second film layer.

[0018] In the LED structure of some embodiments, the reflection structure layer includes a second micro-structure layer.

[0019] In the LED structure of some embodiments, the second micro-structure layer includes a plurality of micro-structures, and the plurality of micro-structures are arranged in an array.

[0020] In the LED structure of some embodiments, the second micro-structure layer includes a plurality of micro-structures, and the shape of the micro-structure is cylindrical or prismatic or hemispherical or pyramidal.

[0021] An embodiment of the present application further provides an LED structure, including a light-emitting layer, a scattering structure layer, and a substrate stacked in sequence;

[0022] The scattering structure layer is configured to adjust the divergence angle of the emitted light rays of the light-emitting layer, so that the divergence angle of the emitted light rays is converted from a first angle to a second angle; wherein, the second angle is greater than the first angle.

[0023] In the LED structure of some embodiments, the LED structure further includes a reflection structure layer, and the reflection structure layer is stacked on the substrate; the direction towards the substrate of the light-emitting layer is the light-emitting direction of the LED structure;

[0024] The reflection structure layer is configured to reflect at least part of the light rays emitted in the light-emitting direction back to the scattering structure layer;

[0025] The scattering structure layer is further configured to scatter the light rays reflected by the reflection structure layer again.

[0026] The embodiment of the present application also provides an LED structure, which includes a back reflection layer, a scattering structure layer, a light emitting layer, and a substrate that are sequentially stacked; the direction of the light emitting layer facing the substrate is the light emitting direction of the LED structure;

[0027] The scattering structure layer is used to scatter the emitted light of the light emitting layer and / or the reflected light of the back reflection layer to increase the light emitting divergence angle in the light emitting direction.

[0028] In the LED structure of some embodiments, the LED structure further includes a reflection structure layer, and the reflection structure layer is stacked on the substrate;

[0029] The reflection structure layer is used to reflect at least part of the light emitted in the light emitting direction to the scattering structure layer;

[0030] The scattering structure layer is further used to scatter the light reflected by the reflection structure layer again.

[0031] The embodiment of the present application also provides an LED lamp bead, and the LED lamp bead includes the above-mentioned LED structure.

[0032] The embodiment of the present application also provides a backlight source, and the backlight source includes a plurality of the above-mentioned LED structures.

[0033] The embodiment of the present application also provides a backlight source, and the backlight source includes a plurality of the above-mentioned LED lamp beads.

[0034] An LED structure, an LED lamp bead, and a backlight source provided by the present application, wherein the LED structure includes a light emitting component and a scattering structure layer arranged in a stacked manner, and the scattering structure layer increases the divergence angle of the emitted light in the light emitting component, so that the light emitting divergence angle of the LED structure is increased. Then when using this LED structure to form a backlight source, on the one hand, it can ensure that the LED structure realizes a larger divergence angle at a shorter optical distance, which is beneficial to the thin and light design of the product. On the other hand, it can reduce the use of additional lens, reflector, and diffusion film layer structures, avoid the absorption or reflection of the light energy of the LED structure by the film layer, thereby reducing the light energy loss, improving the light utilization rate, reducing power consumption, and achieving the purpose of improving the light efficiency and visual effect. Description of the Drawings

[0035] The following combines the drawings and details the specific implementation manners of the present application, and the technical solutions and other beneficial effects of the present application will be obvious.

[0036] Figure 1 It is a schematic structural diagram of the first embodiment of the LED structure provided by the embodiment of the present application.

[0037] Figure 2 and Figure 3 It is a schematic diagram of the micro-structure arrangement of the first micro-structure layer in the LED structure provided by the embodiment of the present application.

[0038] Figure 4 Top view schematic diagram of the first embodiment of the scattering structure layer in the LED structure provided by the embodiment of the present application.

[0039] Figure 5 Provided by the embodiment of the present application Figure 4 Light ray schematic diagram in

[0040] Figure 6 Schematic diagram of the relationship between the scattering intensity and the scattering angle corresponding to the microstructures with different heights in the first microstructure layer provided by the embodiment of the present application.

[0041] Figure 7 Top view schematic diagram of the second embodiment of the scattering structure layer in the LED structure provided by the embodiment of the present application.

[0042] Figure 8 Provided by the embodiment of the present application Figure 7 Light ray schematic diagram in

[0043] Figure 9 Schematic diagram of the structure of the second embodiment of the LED structure provided by the embodiment of the present application.

[0044] Figure 10 Schematic diagram of the structure of the first embodiment of the reflection structure layer in the LED structure provided by the embodiment of the present application.

[0045] Figure 11 Optical interference schematic diagram of the optical thin film layer in the LED structure provided by the embodiment of the present application.

[0046] Figure 12 Provided by the embodiment of the present application Figure 10 Optical schematic diagram in

[0047] Figure 13 Top view schematic diagram of the second embodiment of the reflection structure layer in the LED structure provided by the embodiment of the present application.

[0048] Figure 14 Schematic diagram of the structure of the third embodiment of the LED structure provided by the embodiment of the present application.

[0049] Figure 15 Schematic diagram of the structure of the fourth embodiment of the LED structure provided by the embodiment of the present application.

[0050] Figure 16 Schematic diagram of the structure of the fifth embodiment of the LED structure provided by the embodiment of the present application.

[0051] Figure 17 Schematic diagram of the structure of the sixth embodiment of the LED structure provided by the embodiment of the present application.

[0052] Figure 18 This is a schematic structural diagram of the backlight provided by the embodiment of the present application.

[0053] Reference numerals:

[0054] 11, light-emitting component; 12, scattering structure layer; 13, reflection structure layer; 131, optical thin film layer; 10, substrate; 20, LED structure;

[0055] 111, back reflection layer; 112, light-emitting layer; 113, substrate. Specific embodiments

[0056] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

[0057] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0058] Please refer to Figure 1 , this embodiment provides an LED structure, which includes a light-emitting component 11 and a scattering structure layer 12 arranged in a stacked manner; the scattering structure layer 12 is used to adjust the divergence angle of the first outgoing light of the light-emitting component 11, so that the divergence angle of the first outgoing light is converted from a first angle to a second angle; wherein, the second angle is greater than the first angle.

[0059] In the embodiment of the present application, a scattering structure layer 12 is directly added to a single LED chip to form a single LED structure. The divergence angle of the first outgoing light of the light-emitting component 11 is increased by the scattering structure layer 12, so that the light-emitting divergence angle of the LED structure is increased. Then, when using this LED structure to form a backlight, on the one hand, it can ensure that the LED structure realizes a larger divergence angle at a shorter optical distance, which is beneficial to the thin and light design of the product; on the other hand, it can reduce the use of additional lens, reflector and diffusion film layer structures, and can avoid the absorption or reflection of the light energy of the LED structure by the film layer, thereby reducing the light energy loss, improving the light utilization rate, reducing the power consumption, and achieving the purpose of improving the light efficiency and visual effect.

[0060] In addition, when forming a backlight source using this LED structure, there is no need to add additional structural layers such as lenses, reflectors, and diffusion films, which can also simplify the structure of the backlight source and reduce costs. When forming a backlight source using this LED structure, compared with the LED structure with a small divergence angle, a sparser arrangement of LED lamp beads can meet the brightness uniformity, reducing the number of LED structures and also achieving the purpose of cost savings.

[0061] In some embodiments, the scattering structure layer 12 includes a first microstructure layer, the first microstructure layer includes a plurality of microstructures, and the shape of the microstructures is cylindrical or prismatic or hemispherical or pyramidal. In this embodiment, the shapes of the plurality of microstructures in the first microstructure layer may be the same, that is, the plurality of microstructures in the first microstructure layer are all cylindrical or all prismatic. Of course, there may be a combination of various different shapes among the plurality of microstructures in the first microstructure layer, that is, some of the microstructures in the first microstructure layer are cylindrical and some are prismatic, and the present application does not make specific limitations in this regard. In this embodiment, the maximum center-to-center distance between the microstructures is greater than the wavelength of the outgoing light of the light-emitting component 11, and the respective dimensions of the corresponding microstructures are greater than the wavelength of the outgoing light of the light-emitting component 11 and less than the maximum center-to-center distance, so as to facilitate the scattering effect of light and expand the light-emitting divergence angle of the LED structure.

[0062] In some embodiments, the first microstructure layer includes a plurality of microstructures, and the plurality of microstructures are arranged in an array. For example, the plurality of microstructures are arranged in a rectangular array or can be arranged in a concentric circle array. Taking the shape of the microstructures as cylindrical as an example: as Figure 2 shown, the plurality of microstructures in the first microstructure layer are arranged in a rectangular array, and p1 and p2 represent the center-to-center distance between two columns of microstructures. As Figure 3 shown, the plurality of microstructures in the first microstructure layer are arranged in a concentric circle array, p3 is the interval between the microstructure located at the center of the concentric circles and the adjacent concentric circles, and p4 is the interval between the second concentric circle and the third concentric circle.

[0063] As an embodiment, the plurality of microstructures are arranged in a rectangular array, and the center-to-center distance between two adjacent microstructures is greater than the wavelength of the first outgoing light; for example, the center-to-center distance is 1.5 times or 2 times the wavelength. The center-to-center distance between two adjacent microstructures is as Figure 2 shown by p1 and p2 in. The plurality of microstructures are arranged in an array, p1 is equal to p2 and greater than the wavelength of the first outgoing light. If the outgoing light of the LED structure is blue light, the wavelength of the first outgoing light is the blue light wavelength; if the outgoing light of the LED structure is red light, the wavelength of the first outgoing light is the red light wavelength.

[0064] As an embodiment, multiple microstructures are arranged in a concentric circle array, and the interval between two adjacent concentric circles is greater than the wavelength of the first emitted light; for example, this interval is 1.5 times or 2 times the wavelength. The interval between two adjacent concentric circles is as shown by p3 and p4 in Figure 3 , where p3 and p4 are equal and greater than the wavelength of the first emitted light. Similarly, if the emitted light of the LED structure is blue light, the wavelength of the first emitted light is the blue light wavelength; if the emitted light of the LED structure is red light, the wavelength of the first emitted light is the red light wavelength.

[0065] In the embodiment of the present application, multiple microstructures are arranged in an array, and a certain arrangement period is formed between the microstructures, so that the first microstructure layer has grating diffraction characteristics, thereby coupling the light passing through this structure layer to high-order diffraction through the first microstructure layer, so as to achieve an increase in the divergence angle.

[0066] Specifically, please refer to Figure 4 and Figure 5 together. Taking the shape of the microstructures in the first microstructure layer as a prism shape as an example for illustration: A beam of incident light at a specific angle can be diffracted to multiple angles, that is, on multiple diffraction orders, through the structure layer arranged in an array, presenting a larger angular range of light output, playing a diffusing role to form a uniform light spot. At the same time, by precisely controlling the size of the arrangement period (such as the sizes of p1, p2, p3, p4), the intensity of different diffraction orders can be controlled, further realizing the function of diffusing and homogenizing light.

[0067] As an embodiment, the microstructures in the first microstructure layer are nano-microstructures, that is, the microstructures in the first microstructure layer are all microstructures of nano size. In this embodiment, by setting the microstructures to structures of the same order of magnitude as the wavelength, that is, nano size, it is ensured that the effect of increasing the divergence angle is more significant. Specifically, when multiple microstructures in the first microstructure layer are arranged in an array, the size of the microstructures is smaller than the arrangement period formed by the array arrangement; when multiple microstructures in the first microstructure layer are arranged non-array, the maximum center distance between the microstructures is greater than the wavelength of the emitted light of the light-emitting component 11, and each dimension of the corresponding microstructures is greater than the wavelength of the emitted light of the light-emitting component 11, but each dimension of the microstructures is smaller than the maximum center distance.

[0068] Among them, the angle of increasing the divergence angle can be adjusted by adjusting the size of the microstructures; for example, adjusting the height and thickness of the cylindrical microstructures; adjusting the height and the bottom side length of the pyramid-shaped microstructures. As shown in Figure 6 , when the shape of the microstructures is a pyramid shape, different microstructures with different heights have different scattering intensities and scattering angles; the different colored curves in the figure correspond to microstructures with different heights. If the height of the microstructures corresponding to the red curve is zero, the height value corresponding to the purple curve is the largest among the five curves.

[0069] Please refer to Figure 7 and Figure 8 . The sizes between multiple microstructures in the first microstructure layer may be different. For example, for cylindrical microstructures, the diameters of microstructures at different positions may be different, and the heights of microstructures at different positions may also be different. In this embodiment, by controlling the outgoing directions of incident light at each local microstructure position, the diffusion and uniform illumination of overall incident light are ultimately achieved. The corresponding principle is as Figure 8 shown.

[0070] Please refer to Figure 9 . In some embodiments, the LED structure further includes a reflective structure layer 13, which is stacked on the scattering structure layer 12. Among them, the reflective structure layer 13 is used to reflect at least part of the outgoing light in the second outgoing light emitted from the scattering structure layer 12 back to the scattering structure layer 12. The scattering structure layer 12 is further used to scatter the light reflected by the reflective structure layer 13 to further increase the light-emitting divergence angle of the LED structure.

[0071] In this embodiment, the reflective structure layer 13 is stacked on the scattering structure layer 12. When the first outgoing light of the light-emitting component 11 is scattered by the scattering structure layer 12 to obtain the second outgoing light, the second outgoing light is reflected by the reflective structure layer 13, and the light reflected by the reflective structure layer 13 will reach the scattering structure layer 12 again and be scattered twice. Therefore, by providing the reflective structure layer 13 on the scattering structure layer 12, the light can pass through the scattering structure layer 12 multiple times for scattering, so that the LED structure can obtain a larger divergence angle.

[0072] Please refer to Figure 10 and Figure 11 . In some embodiments, the reflective structure layer 13 includes multiple stacked optical thin film layers, and the refractive indexes between adjacent two optical thin film layers are different. In this embodiment, the thickness of each optical thin film layer can be adjusted so that the incident light at a small angle undergoes constructive interference, the transmittance increases, and all of it is transmitted; while the incident light at a large angle undergoes destructive interference, the transmittance decreases, and all of it is reflected. Therefore, for the first outgoing light with a large divergence angle, after passing through multiple optical thin film layers, it will be reflected to the scattering structure layer 12 to facilitate expanding the light-emitting divergence angle of the LED structure.

[0073] As an embodiment, the reflective structure layer 13 may also include a first film layer and a second film layer that are alternately stacked. The refractive index of the first film layer is different from that of the second film layer. That is, in this embodiment, the reflective structure layer 13 is only provided with two optical thin film layers of different materials, and multiple layers of the two different optical thin film layers are alternately stacked.

[0074] As an embodiment, the thickness of the optical thin film layer is in the nanometer scale. For example, the thickness of the optical thin film layer is sub-wavelength. By using a film layer in the nanometer scale, the interference and diffraction effects of light can be utilized to effectively adjust light.

[0075] As another embodiment, the reflection structure layer 13 includes a first film layer and a second film layer arranged in a stack, wherein the refractive index of the first film layer is different from that of the second film layer. That is, in this embodiment, the reflection structure layer 13 is provided with only two optical thin film layers of different materials, and each of the two different optical thin film layers is provided with one layer.

[0076] Please refer to Figure 12 and Figure 13 , in this embodiment, the thicknesses of both the first film layer and the second film layer can be in the nanometer scale. By using a film layer in the nanometer scale, the interference and diffraction effects of light can be utilized to effectively adjust light. Specifically, for multiple film layers, the thickness of each film layer can be precisely adjusted so that the incident light within a specific angle range interferes destructively, the transmittance decreases, and all light is reflected, facilitating multiple scattering of light. As Figure 12 shown, when the incident angle a of the incident light is less than a preset angle range such as 15°, it can pass through, while the incident light at other angles is reflected. As Figure 13 shown, when the incident angle a of the incident light is within a preset angle range such as between 15° and 35°, it can pass through, while the incident light at other angles is reflected.

[0077] As another embodiment, the reflection structure layer 13 includes a second microstructure layer; the second microstructure layer includes multiple microstructures, and the shape of the microstructures is cylindrical or prismatic or hemispherical or pyramidal. In this embodiment, the shapes of the multiple microstructures in the second microstructure layer can be the same, that is, all the multiple microstructures in the second microstructure layer are cylindrical or all are prismatic. Of course, there can be a combination of multiple different shapes among the multiple microstructures in the second microstructure layer, that is, some of the microstructures in the second microstructure layer are cylindrical in shape and some are prismatic in shape. This application does not make specific limitations on this. In this embodiment, the maximum center distance between the microstructures is less than the wavelength of the outgoing light of the light-emitting component 11, and the respective dimensions of the corresponding microstructures are less than the wavelength of the outgoing light of the light-emitting component 11, so as to effectively reflect light.

[0078] In some embodiments, the second microstructure layer includes multiple microstructures, and the multiple microstructures are arranged in an array. For example, the multiple microstructures are arranged in a rectangular array or can be arranged in a concentric circle array. Taking the shape of the microstructures as cylindrical as an example: as Figure 2 shown, the multiple microstructures in the first microstructure layer are arranged in a rectangular array, and p1 and p2 represent the center distance between two columns of microstructures. As Figure 3As shown, multiple microstructures in the second microstructure layer are arranged in a concentric circle array. p3 is the interval between the microstructure located at the center of the concentric circles and the adjacent concentric circle, and p4 is the interval between the second concentric circle and the third concentric circle.

[0079] Similarly, in this embodiment, multiple microstructures are arranged in an array, and a certain arrangement period is formed between the microstructures; this arrangement period can be smaller than the wavelength of the first outgoing light, that is, p1 and p2 are the same and smaller than the wavelength of the first outgoing light, or p3 and p4 are the same and smaller than the wavelength of the first outgoing light. Among them, in this embodiment, by adjusting the size of the microstructures, such as adjusting the height and thickness of the cylindrical microstructures, and the height and bottom side length of the pyramid-shaped microstructures, the second microstructure layer can have different reflection effects, so as to be combined with the scattering structure layer to further expand the light-emitting diffusion angle of the LED structure.

[0080] Among them, the microstructures in the second microstructure layer are nano-microstructures; in this embodiment, by setting the microstructures to structures with the same order of magnitude as the wavelength, that is, nano-scale structures, it is ensured that the effect of expanding the divergence angle is more significant.

[0081] In this embodiment, the LED structure is obtained by stacking the scattering structure layer 12 and the reflection structure layer 13 on the surface of the LED chip, so that the light-emitting diffusion angle of the LED structure is increased. Then, when using this LED structure to form a backlight source, on the one hand, it can ensure that the LED structure achieves a larger divergence angle at a shorter optical distance, which is beneficial to the thin and light design of the product; on the other hand, it can reduce the use of additional lens, reflector and diffusion film layer structures, avoid the absorption or reflection of the light energy of the LED structure by the film layer, thereby reducing the light energy loss, improving the light utilization rate, reducing the power consumption, and achieving the purpose of improving the light efficiency and visual effect.

[0082] In addition, when using this LED structure to form a backlight source, there is no need to add additional lens, reflector and diffusion film and other structures, which can also simplify the structure of the backlight source, reduce the volume and cost. And when using this LED structure to form a backlight source, compared with the LED structure with a small divergence angle, a sparser arrangement of LED lamp beads can be used to meet the brightness uniformity, the number of LED structures can be reduced, and the purpose of cost saving can also be achieved.

[0083] Please refer to Figure 14, embodiments of the present application also provide an LED structure, which includes a back reflection layer 111, a light-emitting layer 112, a scattering structure layer 12, and a substrate 113 that are sequentially stacked; the scattering structure layer 12 is used to adjust the divergence angle of the first outgoing light of the light-emitting layer 112, so that the divergence angle of the first outgoing light is converted from a first angle to a second angle; wherein, the second angle is greater than the first angle. Compared with disposing the scattering structure layer 12 on the surface of the LED chip, the scattering structure layer 12 can also be disposed inside the LED chip to form a single LED structure; specifically, the scattering structure layer 12 can also be disposed between the light-emitting layer 112 and the substrate 113. When the light of the light-emitting layer 112 inside the LED chip passes through the scattering structure layer 12, the scattering structure layer 12 can scatter and expand the divergence angle, and finally increase the light-emitting divergence angle of the LED structure.

[0084] At the same time, due to the presence of the back reflection layer 111, the light passing through the scattering structure layer 12 can be reflected by the back reflection layer 111 and then pass through the scattering structure layer 12 again for re-scattering, so as to further expand the light-emitting divergence angle of the LED structure.

[0085] It should be noted that the structure of the scattering structure layer 12 in this embodiment is the same as that of the above-mentioned scattering structure layer 12. Therefore, the specific structure of the scattering structure layer 12 will not be elaborated here.

[0086] Please refer to Figure 15 , in some embodiments, the LED structure further includes a reflection structure layer 13, which is stacked on the substrate 113; the direction of the light-emitting layer 112 facing the substrate 113 is the light-emitting direction of the LED structure; the reflection structure layer 13 is used to reflect at least part of the light emitted in the light-emitting direction to the scattering structure layer 12; the scattering structure layer 12 is further used to re-scatter the light reflected by the reflection structure layer 13 to further expand the light-emitting divergence angle of the LED structure. It should be noted that the structure of the reflection structure layer 13 in this embodiment is the same as that of the above-mentioned reflection structure layer 13. Therefore, the specific structure of the reflection structure layer 13 in this embodiment will not be elaborated here.

[0087] Please refer to Figure 16, embodiments of the present application also provide an LED structure, including a back reflection layer 111, a scattering structure layer 12, a light emitting layer 112, and a substrate 113 that are sequentially stacked; the direction of the light emitting layer 112 facing the substrate 113 is the light emitting direction of the LED structure; the scattering structure layer 12 is used to scatter the emitted light of the light emitting layer 112 and / or the reflected light of the back reflection layer 111 to increase the light emitting divergence angle in the light emitting direction. In the embodiments of the present application, the scattering structure layer 12 can also be disposed between the back reflection layer 111 and the light emitting layer 112. At this time, the emitted light of the light emitting layer 112 along the direction opposite to the light emitting direction can be scattered by the scattering structure layer 12; then the light passing through the scattering structure layer 12 will be scattered again by the back reflection layer 111 and then pass through the scattering structure layer 12 again, thereby realizing multiple scattering of light to expand the light emitting scattering angle of the LED structure.

[0088] Please refer to Figure 17 , in some embodiments, the LED structure further includes a reflection structure layer 13, and the reflection structure layer 13 is stacked on the substrate 113; the reflection structure layer 13 is used to reflect at least part of the light emitted in the light emitting direction to the scattering structure layer 12; the scattering structure layer 12 is further used to scatter the light reflected by the reflection structure layer 13, so that the LED structure can obtain a larger divergence angle.

[0089] Embodiments of the present application also provide 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 elaborated here.

[0090] Please refer to Figure 18 , embodiments of the present application also disclose a backlight, which includes a substrate 10, and a plurality of the above-mentioned LED structures 20 are attached to the substrate 10; since a scattering structure layer 12 and a reflection structure layer 13 are provided for each LED structure 20, a larger light emitting divergence angle and a more uniform light spot distribution can be achieved at a shorter optical distance; at the same time, structures such as a diffusion film, a reflector, or a reflecting cup can be omitted, which can effectively simplify the structure and manufacturing process of the backlight, thereby reducing costs. At the same time, reducing the use of lens, reflector, and diffusion film layer structures can avoid the absorption or reflection of the light energy of the LED structure 20 by the film layer, thereby reducing light energy loss to facilitate improving the visual effect; because the lens, reflector, and diffusion film layer occupy a large volume and weight, reducing their settings can simplify the structure of the backlight, reduce the overall volume and weight, and reduce the process difficulty and cost.

[0091] Embodiments of the present application also provide a backlight, which includes a plurality of the above-mentioned LED lamp beads. Since the LED structure has been described in detail above, it will not be elaborated here.

[0092] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not elaborated in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0093] The above has introduced in detail the LED structure provided by the embodiments of the present application. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An LED structure, characterized in that, The LED structure includes a light-emitting component and a scattering structure layer arranged in a stacked manner; the scattering structure layer is used to adjust the divergence angle of the first emitted light of the light-emitting component, so that the divergence angle of the first emitted light is converted from a first angle to a second angle; wherein, the second angle is greater than the first angle.

2. The LED structure according to claim 1, wherein, The scattering structure layer includes a first micro-structure layer.

3. The LED structure according to claim 2, characterized in that, The first micro-structure layer includes a plurality of micro-structures, and the plurality of micro-structures are arranged in an array.

4. The LED structure according to claim 2, characterized in that, The first micro-structure layer includes a plurality of micro-structures, and the shape of the micro-structure is cylindrical or prismatic or hemispherical or pyramidal.

5. The LED structure according to claim 2, wherein, The first micro-structure layer includes a plurality of micro-structures, and the plurality of micro-structures are nano micro-structures.

6. The LED structure according to claim 3, wherein, The plurality of micro-structures are arranged in a rectangular array, and the center distance between two adjacent micro-structures is greater than the wavelength of the first emitted light.

7. The LED structure according to claim 3, characterized in that, The plurality of micro-structures are arranged in a concentric circle array, and the interval between two adjacent concentric circles is greater than the wavelength of the first emitted light.

8. The LED structure according to any one of claims 1-7, characterized in that, The LED structure further includes a reflection structure layer, and the reflection structure layer is stacked on the scattering structure layer; wherein, the reflection structure layer is used to reflect at least part of the emitted light in the second emitted light emitted from the scattering structure layer to the scattering structure layer; The scattering structure layer is further used to scatter the light reflected by the reflection structure layer again.

9. The LED structure according to claim 8, wherein The reflection structure layer includes a plurality of stacked optical thin film layers, and the refractive indices of two adjacent optical thin film layers are different.

10. The LED structure according to claim 8, wherein The reflection structure layer includes a plurality of first film layers and second film layers alternately stacked, and the refractive index of the first film layer is different from the refractive index of the second film layer.

11. The LED structure according to claim 8, wherein The reflection structure layer includes a first film layer and a second film layer stacked, and the refractive index of the first film layer is different from the refractive index of the second film layer.

12. The LED structure according to claim 8, wherein The reflection structure layer includes a second micro-structure layer.

13. The LED structure according to claim 12, wherein, The second micro-structure layer includes a plurality of micro-structures, and the plurality of micro-structures are arranged in an array.

14. The LED structure according to claim 13, wherein, The second micro-structure layer includes a plurality of micro-structures, and the shape of the micro-structure is cylindrical or prismatic or hemispherical or pyramidal.

15. An LED structure, characterized in that, It includes a light-emitting layer, a scattering structure layer and a substrate arranged in a stacked manner in sequence; The scattering structure layer is used to adjust the divergence angle of the emitted light of the light-emitting layer, so that the divergence angle of the emitted light is converted from a first angle to a second angle; wherein, the second angle is greater than the first angle.

16. The LED structure according to claim 15, wherein, The LED structure further includes a reflection structure layer, and the reflection structure layer is stacked on the substrate; the direction of the light-emitting layer facing the substrate is the light-emitting direction of the LED structure; The reflection structure layer is used to reflect at least part of the light emitted in the light-emitting direction to the scattering structure layer; The scattering structure layer is further used to scatter the light reflected by the reflection structure layer again.

17. An LED structure, characterized in that, It includes a back reflection layer, a scattering structure layer, a light-emitting layer and a substrate arranged in a stacked manner in sequence; the direction of the light-emitting layer facing the substrate is the light-emitting direction of the LED structure; The scattering structure layer is used to scatter the emitted light of the light-emitting layer and / or the reflected light of the back reflection layer to increase the light-emitting divergence angle in the light-emitting direction.

18. The LED structure according to claim 17, wherein, The LED structure further includes a reflective structure layer, which is laminated on the substrate; The reflective structure layer is configured to reflect at least part of the light emitted in the light-emitting direction to the scattering structure layer; The scattering structure layer is further configured to scatter again the light reflected by the reflective structure layer.

19. An LED lamp bead, characterized in that, The LED lamp bead includes the LED structure according to any one of claims 1-18.

20. A backlight, characterized in that, The backlight source includes a plurality of LED structures according to any one of claims 1-18.

21. A backlight, characterized in that, The backlight source includes a plurality of LED lamp beads according to claim 19.

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