CN113948503A - Light emitting device and display apparatus including the same - Google Patents

Light emitting device and display apparatus including the same Download PDF

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Publication number
CN113948503A
CN113948503A CN202111188212.3A CN202111188212A CN113948503A CN 113948503 A CN113948503 A CN 113948503A CN 202111188212 A CN202111188212 A CN 202111188212A CN 113948503 A CN113948503 A CN 113948503A
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light
layer
emitting device
led packaging
substrate
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金国君
冯连荣
罗飞
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Najing Technology Corp Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/52—Encapsulations
    • H01L33/54—Encapsulations having a particular shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements

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  • Microelectronics & Electronic Packaging (AREA)
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Abstract

The application provides a light emitting device and a display device. The light emitting device includes: the LED packaging structure comprises a substrate, wherein a plurality of hemispherical initial LED packaging bodies arranged in an array mode are arranged on the surface of the substrate; the light steering layer is arranged on the initial LED packaging body, the surface of one side, far away from the substrate, of the light steering layer has a flat effect, and the light steering layer enables light rays emitted by the initial LED packaging body during working to be deflected towards the normal side; the light conversion layer is arranged on one side of the light turning layer, which is far away from the substrate, and is parallel to the substrate; wherein the maximum light-emitting angle of each initial LED package is less than 90 DEG
Figure DDA0003300151540000011
Ratio of d to h
Figure DDA0003300151540000012
Theta is an included angle between the widest outgoing light ray and a normal line, d is a horizontal distance between center points of the LEDs contained in any two adjacent initial LED packaging bodies, h is a shortest distance between the upper surface of the LEDs contained in the initial LED packaging bodies and the lower surface of the light conversion layer, a is a set value representing the brightness uniformity of the light-emitting device, and a is more than 0.6 and less than or equal to 1.

Description

Light emitting device and display apparatus including the same
Technical Field
The application relates to the field of photoelectric technology, in particular to a light-emitting device and a display device comprising the same.
Background
Many available technologies increase the Light Emitting angle of an LED (Light Emitting Diode) mainly through a lens or a microstructure, so that the Light of the entire LED array is relatively uniform. However, in practical situations, in order to meet the requirements of brightness and optical uniformity, the light-emitting angle of the LED needs to be changed, and the arrangement of the LED and the optical films such as the diffuser plate and the brightness enhancement sheet work together. For the small-pitch or ultra-small-pitch LED arrays such as Mini-LEDs (sub-millimeter semiconductor Light Emitting diodes) using quantum dots, the interval change range between the LEDs is limited. While medium and small size displays have limitations on the overall thickness of the structure, there is also a limit to improving the light shadow problem and the light uniformity problem through optical films such as diffusers.
Therefore, a new approach is needed to improve the uniformity of the light emitted from the LED array and alleviate the problem of lamp shadow.
Disclosure of Invention
An object of the present application is to provide a light emitting device including: the LED packaging structure comprises a substrate, wherein a plurality of hemispherical initial LED packaging bodies arranged in an array are arranged on the surface of the substrate; the light steering layer is arranged on the initial LED packaging body, one side surface, far away from the substrate, of the light steering layer has a flat effect, and the light steering layer enables light rays emitted by the initial LED packaging body during operation to be deflected towards the normal side; a light conversion layer disposed on a side of the light diverting layer away from the substrate and parallel to the substrate; wherein the maximum light-emitting angle theta of each initial LED package is less than 90 DEG and satisfies
Figure BDA0003300151520000011
Ratio of d to h
Figure BDA0003300151520000012
Theta is an included angle between the widest outgoing light ray and the normal line, d is a horizontal distance between the center points of the LEDs contained in any two adjacent initial LED packages, h is a shortest distance between the upper surface of the LEDs contained in the initial LED packages and the lower surface of the light conversion layer, and a represents the shortest distance between the upper surface of the LEDs contained in the initial LED packages and the lower surface of the light conversion layerThe brightness uniformity of the optical device is set, a is more than 0.6 and less than or equal to 1.
Further, the air conditioner is provided with a fan,
Figure BDA0003300151520000013
further, a is more than 0.85 and less than or equal to 1.
Furthermore, theta is 60 degrees, and the ratio of d to h is less than or equal to 0.21.
Further, the above light emitting device further includes: the first light anti-reflection layer is arranged on the initial LED packaging bodies in a contact mode, is attached to the outline of each initial LED packaging body and extends; the first light anti-reflection layer is used for enabling first light rays with the wavelength smaller than a preset wavelength emitted by the initial LED packaging body to penetrate through; the equivalent refractive index of the first light reflection reducing layer is greater than that of the light turning layer; preferably, the predetermined wavelength is 500 nm.
Further, the first light reflection reducing layer is further configured to reflect a second light beam having a wavelength within a predetermined wavelength band, where the second light beam is emitted from the light conversion layer and reaches the first light reflection reducing layer; preferably, the predetermined wavelength range is 380nm to 780 nm.
Further, the above light emitting device further includes: a second light reflection reducing layer located on a side of the light conversion layer away from the light turning layer, the second light reflection reducing layer being configured to allow visible light to pass through and to block ultraviolet light from passing through; preferably, the second light reflection reducing layer can transmit light in a wavelength range of 450nm to 780 nm.
Further, the second light reflection reducing layer includes diffusion particles.
Further, the second light reflection reducing layer, the light conversion layer, the light diverting layer, and the first light reflection reducing layer each independently include one or more layers.
Further, the equivalent refractive index of the second light reflection reducing layer, the equivalent refractive index of the light conversion layer, the maximum equivalent refractive index of the light diverting layer, and the equivalent refractive index of the first light reflection reducing layer are increased in this order.
Further, the above light emitting device further includes: and the protective layer is positioned on one side of the second light reflection reducing layer far away from the light conversion layer.
Further, the LED is a micro-LED or a mini-LED.
Further, the light conversion layer is a quantum dot color film.
The present application also provides a display device including any one of the above light emitting devices.
By applying the technical scheme, the light steering layer is arranged between the light conversion layer and the initial LED packaging body, so that the emergent light deflects towards the normal side, and the relationship among the three is designed as follows: the maximum light-emitting angle theta of the initial LED packaging body, the distance d between the adjacent initial LED packaging bodies, the vertical distance h between the initial LED packaging bodies and the light conversion layer, and the brightness uniformity of the light-emitting device and the relation between the brightness uniformity and the d and h are set, so that the degree of the light emitted by the initial LED packaging bodies deflecting towards the normal side is controlled, the light energy in the area between the two adjacent initial LED packaging bodies is moderately enhanced, the light energy right above the initial LED packaging bodies is moderately reduced, the lamp shadow problem of the light-emitting device is solved, and compared with the technical scheme that the light of the whole LED is relatively uniform by increasing the light-emitting angle of the LED in the prior art, the technical scheme of the application also realizes that the energy (brightness) distribution uniformity of the light-emitting device is improved under the condition that the whole light energy loss is small.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 shows a schematic structure of a light emitting device of the prior art;
fig. 2 shows a schematic structural view of a light emitting device of an embodiment of the present application;
fig. 3 is a schematic view showing a traveling direction of the widest outgoing light ray of the light emitting device according to the embodiment of the present application;
fig. 4 shows a schematic structural view of a light emitting device of an embodiment of the present application;
fig. 5 shows an optical software simulation result of a light field energy distribution of the light emitting device of the embodiment of the present application;
fig. 6 shows the optical software simulation result of the light field energy distribution of the light-emitting device of comparative example 1 of the present application;
fig. 7 shows the optical software simulation result of the light field energy distribution of the light-emitting device of comparative example 2 of the present application.
Reference numerals:
100. a light emitting device; 10. an LED; 11. a substrate; 13. a light conversion layer; 101. a first critical light-emitting ray; 102. a second critical light-emitting ray; 200. a light emitting device; 300. a light emitting device; 20. an initial LED package; 21. a substrate; 22. a light diverting layer; 23. a light conversion layer; 24. a first light anti-reflection layer; 25. a second light anti-reflection layer; 26. and a protective layer.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may be present. In contrast, when an element is referred to as being "in contact with" or "directly on" another element, there are no intervening elements present.
Fig. 1 shows an energy distribution model of a prior art light emitting device 100 with an LED as the primary light source, wherein the intermediate layer between the LED and the light converting layer 13 is not shown, and does not comprise a layer functionally identical to the light diverting layer. When only the primary light source a is operated, the excitation energy received by the light conversion layer 13 directly above the primary light source a is E1, the excitation energy received by the light conversion layer 13 in the region between the primary light source a and the primary light source B is E3, and the excitation energy received by the light conversion layer 13 directly above the primary light source B is E2. The excitation energy E decreases as the distance L between the energy receiving point of the light conversion layer 13 and the primary light source A increases, and the excitation energy E ^ 1/L2Therefore, from the center of the initial light source a to the outside, the corresponding excitation energy decreases with the increase of the optical path, i.e., E1 > E3 > E2. Taking the light-emitting light at the rightmost point of the primary light source a as an example, the light-emitting light between the first critical light-emitting light 101 and the second critical light-emitting light 102 is irradiated on the light-converting layer 13 directly above another primary light source B, so when the primary light source a and the primary light source B operate simultaneously (for model simplification, the light emission of the primary light sources other than A, B is not considered), the energy directly above the primary light source a is E1+ E2, the energy directly above the primary light source B is E1+ E2, and the energy in the middle area between the primary light source a and the primary light source B is E3+ E3. In practical situations, such as mini-LED and micro-LED, where the lamp shadow phenomenon occurs above the initial light source, i.e. E1+ E2 > 2E3, the energy (brightness) distribution is very different, which results in a serious impact on the optical quality of the product.
In one aspect of the present application, as shown in fig. 2, there is provided a light emitting device 200 including: a substrate 21, wherein a plurality of hemispherical initial LED packages 20 arranged in an array are disposed on the surface of the substrate 21; a light diverting layer 22 disposed on the initial LED package 20, wherein the light diverting layer 22 has a flat surface on a side thereof away from the substrate 21, and the light diverting layer 22 directs light emitted from the initial LED package 20 to the normal lineSide deflection; a light conversion layer 23 disposed on a side of the light diverting layer 22 away from the substrate 21 and parallel to the substrate 21; wherein the maximum light-emitting angle theta of each initial LED package 20 is less than 90 DEG and satisfies
Figure BDA0003300151520000041
Ratio of d to h
Figure BDA0003300151520000042
Theta is an included angle between the widest outgoing light ray and a normal line, d is a horizontal distance between center points of the LEDs contained in any two adjacent initial LED packaging bodies, h is a shortest distance between the upper surface of the LEDs contained in the initial LED packaging bodies and the lower surface of the light conversion layer, a is a set value representing the brightness uniformity of the light-emitting device, and a is more than 0.6 and less than or equal to 1.
The "normal line" refers to a broken line that is always perpendicular to the plane of the substrate. The "widest light-emitting beam" is defined as the light at the edge of the beam of light emitted from the LED included in the initial LED package. The hemispherical initial LED packaging bodies arranged in the array comprise a plurality of LEDs arranged in the array, and each initial LED packaging body comprises one LED. "the upper surface of the LED" refers to the surface of the LED on the side away from the substrate; the "lower surface of the light conversion layer" refers to a surface of the light conversion layer on the side closer to the substrate.
As shown in fig. 1, in a light emitting device without a light diverting layer, the light exit angle of the second critical exit light ray 102 is β. When the light diverting layer 22 is disposed in the light emitting device, as shown in fig. 3, the outgoing light with an outgoing light angle β is deflected to the normal side in the light diverting layer 22, and the intersection point of the outgoing light at the lower surface of the light diverting layer 23 moves to the left, that is, α < β, so that the excitation energy received by the light diverting layer 23 directly above the primary light source is reduced, and the excitation energy received by the light diverting layer 23 in the middle area between two adjacent primary light sources is increased, thereby making up the energy (brightness) distribution difference existing in the light emitting device in the prior art, and improving the optical quality of the product using the light emitting device.
The light-emitting device provided by the application is provided with the light steering layer between the light conversion layer and the initial LED packaging body, so that the emergent light deflects towards the normal side, and the relationship among the three is designed as follows: the maximum light-emitting angle theta of the initial LED packaging body, the distance d between the adjacent initial LED packaging bodies, the vertical distance h between the initial LED packaging bodies and the light conversion layer, and the brightness uniformity of the light-emitting device and the relation between the brightness uniformity and the d and h are set, so that the degree of the light emitted by the initial LED packaging bodies deflecting towards the normal side is controlled, the light energy in the area between the two adjacent initial LED packaging bodies is moderately enhanced, the light energy right above the initial LED packaging bodies is moderately reduced, the lamp shadow problem of the light-emitting device is solved, and compared with the technical scheme that the light of the whole LED is relatively uniform by increasing the light-emitting angle of the LED in the prior art, the technical scheme of the application also realizes that the energy (brightness) distribution uniformity of the light-emitting device is improved under the condition that the whole light energy loss is small.
In some embodiments, the LED may be at least one of a blue light chip, a violet light chip and an ultraviolet light chip, and may also be a high color temperature chip having a color temperature > 10000K.
In some embodiments, the initial LED package 20 includes a transparent filler disposed at the periphery of the LED for primary packaging of the LED, thereby improving its stability and also serving as a thermal insulation.
In some embodiments of the present invention, the,
Figure BDA0003300151520000051
in some embodiments, 0.85 < a ≦ 1.
In some embodiments, θ is 60 °, and the ratio of d to h is ≦ 0.21.
As shown in fig. 4, in some embodiments, the light emitting device further comprises: a first light reflection reducing layer 24 disposed on the initial LED packages 20 in contact with each other and extending along the outline of each of the initial LED packages 20; the first light antireflection layer 24 is used for transmitting first light rays with a wavelength smaller than a preset wavelength, which are emitted by the initial LED package 20; the equivalent refractive index of the first light anti-reflection layer 24 is greater than the equivalent refractive index of the light diverting layer 22; preferably, the predetermined wavelength is 500 nm.
In some embodiments, first light antireflection layer 24 is further configured to reflect a second light ray having a wavelength within a predetermined wavelength band, the second light ray being a light ray that exits light conversion layer 23 and reaches first light antireflection layer 24; preferably, the predetermined wavelength band is in the range of 380nm to 780 nm.
In some embodiments, the reflectivity of first anti-reflection layer 24 is greater than or equal to 90%, and the reflective surface of first anti-reflection layer 24 may be a frosted surface and may be diffuse reflective.
In some embodiments, the light emitting device further comprises: a second light reflection reducing layer 25 on a side of the light conversion layer 23 away from the light diverting layer 22, the second light reflection reducing layer 25 for passing visible light and for blocking ultraviolet light; preferably, the second light reflection reducing layer 25 is capable of transmitting light having a wavelength ranging from 450nm to 780 nm. The second light anti-reflection layer 25 can effectively prevent ultraviolet light from leaking outside, ensure the light safety of the whole light source, simultaneously effectively reduce the leakage of harmful blue light, reduce high-energy harmful light components from the initial light source and improve the eye health property of the light source.
In some embodiments, second light antireflective layer 25 comprises diffusing particles. The diffusion particles can further play a role in light uniformization, so that the problem of lamp shadow is further solved.
In some embodiments, second light anti-reflective layer 25, light conversion layer 23, light diverting layer 22, and first light anti-reflective layer 24 each independently comprise one or more layers. Or may be an optical layer containing microstructures.
In some embodiments, the equivalent refractive index of the second light anti-reflection layer 25, the equivalent refractive index of the light conversion layer 23, the maximum equivalent refractive index of the light diverting layer 22, and the equivalent refractive index of the first light anti-reflection layer 24 increase in order. The light conversion layer is beneficial to folding of the emitted light after being irradiated by the exciting light, and the purpose of brightening is achieved.
In some embodiments, the light emitting device further comprises: and a protective layer 26, wherein the protective layer 26 is positioned on the side of the second light reflection reducing layer 25 far away from the light conversion layer 23. The protective layer 26 is preferably a transparent encapsulation protective layer, which has a certain water and oxygen blocking effect, protects the optical structures and the light conversion layer in the LED array, and prolongs the service life of the LED array.
In some embodiments, the LED is a micro-LED or a mini-LED.
In some embodiments, the light conversion layer 23 is a quantum dot color film. The quantum dot material used may be at least two of red, green and blue quantum dots. The quantum dot material has the characteristic of omnidirectional luminescence, and relatively uniform light passing through the light steering layer can be further homogenized in the light emitting surface direction after passing through the quantum dot color film.
In some embodiments, the thickness of the light conversion layer 23 is 20% -30% of the total thickness of the light emitting device.
The present application exemplarily provides a method for manufacturing the light emitting device 200, including the following steps: preparing a substrate, and arranging a plurality of hemispherical initial LED packaging bodies in array arrangement on the surface of the substrate; by multiple layers of Si2-xOxOr Si3N4Stacking to prepare a light-steering layer, wherein x represents different atomic proportions, and the different proportions of Si and O atoms in the light-steering layer can be regulated and controlled through reaction conditions and the proportions of reactants, so that the light-steering layer with a stacked structure can be prepared, and the light-steering layer can also be a stacked structure made of different materials; and arranging a light conversion layer material on the upper surface of the flattened light conversion layer or attaching a pre-prepared light conversion layer. The preparation method of each optical functional layer can be realized by adopting various suitable processes in the prior art, and details are not repeated in the application.
In another aspect of the present application, there is provided a display device including any one of the light emitting devices described above. The light-emitting device has good light-emitting uniformity, so that a display device using the light-emitting device also has good brightness uniformity. The display device can be a small and medium-sized display terminal such as a notebook computer, a display, a mobile phone and the like, and can also be a large-sized display terminal such as a television and the like.
The advantageous effects of the present application will be further described below with reference to examples and comparative examples.
A light-emitting device with two adjacent LED lamp beads is constructed through optical simulation software, the emission wavelength of the LED lamp beads is 470nm, the half-peak width of the LED lamp beads is 18nm, the length of the lamp beads is 3.5mm, and the width of the lamp beads is 2.8mm (refer to 2835 specification). A light field energy distribution monitor is disposed directly above the light emitting device. Based on the above light emitting device, the energy plant distribution under different structures (different light deflection angle results) is obtained as shown in fig. 5-7, wherein the numbers 0-8 in the figures represent energies of different magnitudes, different colors correspond to the distribution of different energy fields in fig. 5-7 from small to large, and the energy distribution of the embodiment and the comparative examples 1 and 2 is monitored by an optical field energy distribution monitor.
Examples
Based on the light emitting device 200 corresponding to fig. 2, the required luminance uniformity a is 0.8, i.e. d/h is not more than 2.16, 47.2< θ <65.2, so that θ is set to 65 °, the bead interval d is set to 7mm, and the shortest distance h between the upper surface of the LED bead and the lower surface of the light conversion layer 23 is 3.3mm, so that the emergent light is deflected, the relative angle is reduced, and the corresponding energy distribution is as shown in fig. 5.
The light is deflected in the light diverting layer 22 to control the degree to which the light emitted by the initial LED packages is deflected to the normal side so that the overall energy distribution is uniform with a modest increase in light energy in the area between two adjacent initial LED packages and a modest decrease in light energy directly above the initial LED packages (energy level 8 versus energy level 7). Meanwhile, from the simulation result, the light emergent angle is relatively reduced through light deflection, the optical path between a light source and the quantum dot layer is reduced by a fixed distance, the energy loss is reduced, and the overall energy distribution is relatively strong (energy level 7).
Comparative example 1
Based on the light-emitting device corresponding to the figure 1, no light-steering layer or other layers capable of deflecting the angle of the emergent light are arranged, the corresponding energy field distribution simulation result is shown in figure 6, and the LED lamp beads are taken as energy centers and are sequentially reduced outwards; meanwhile, the area between two LED beads decreases as the light energy increases with distance from the light source, creating a significant energy difference (energy level 8 vs energy level 2) between and above the two light sources, which can create a lamp shadow problem corresponding to the area of higher energy.
Comparative example 2
The light emitting device based on the conventional prism structure, i.e., the prism structure is disposed between the primary light source a (and the primary light source B) and the light conversion layer 13 in fig. 1, so that the angle of the light emitted from the light source is enlarged, and the corresponding energy field distribution is as shown in fig. 7. Energy distribution above the light source (LED lamp bead) and between the two light sources also change: the energy above the light sources is diffused towards the periphery along with the increase of the emergent angle of the light rays, so that the energy distribution is relatively enhanced, the difference between the energy between the two light sources and the energy above the light sources is reduced (energy level 8 is compared with energy level 5), and the whole energy distribution is uniform (energy level 6).
Although both ways correspond to fig. 5 and fig. 7, a change of the light propagation direction can be achieved, thereby achieving a relative homogenization of the light energy distribution in the different regions. Corresponding to the increase angle, the strong energy at the position close to the light source can be dispersed to the weak energy area, so that the light homogenization is realized, the corresponding lamp shadow problem is solved, but the light emergent angle is increased, the light path is increased, and the corresponding energy loss is increased. Therefore, compared with the technical scheme that the light of the LED array is relatively uniform by increasing the light-emitting angle of the LED in the prior art, the technical scheme of the application also realizes that the energy (brightness) distribution uniformity of the light-emitting device is improved under the condition that the overall light energy loss is small.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (14)

1. A light emitting device, comprising:
the LED packaging structure comprises a substrate, wherein a plurality of hemispherical initial LED packaging bodies arranged in an array are arranged on the surface of the substrate;
the light steering layer is arranged on the initial LED packaging body, the surface of one side, far away from the substrate, of the light steering layer has a flat effect, and the light steering layer enables light rays emitted by the initial LED packaging body to be deflected towards the normal side when the initial LED packaging body works;
the light conversion layer is arranged on one side, far away from the substrate, of the light turning layer and is parallel to the substrate;
wherein the maximum light-emitting angle theta of each initial LED package is less than 90 DEG and satisfies
Figure FDA0003300151510000011
Figure FDA0003300151510000012
Ratio of d to h
Figure FDA0003300151510000013
Theta is an included angle between the widest emergent light ray and a normal line, d is a horizontal distance between center points of any two adjacent LEDs contained in the initial LED packaging bodies, h is a shortest distance between the upper surfaces of the LEDs contained in the initial LED packaging bodies and the lower surface of the light conversion layer, a is a set value representing the brightness uniformity of the light-emitting device, and a is more than 0.6 and less than or equal to 1.
2. The light-emitting device according to claim 1,
Figure FDA0003300151510000014
3. the light-emitting device according to claim 1, wherein 0.85 < a.ltoreq.1.
4. The light-emitting device according to claim 1, wherein θ is 60 °, and a ratio of d to h is 0.21 or less.
5. The light-emitting device according to claim 1, further comprising:
the first light anti-reflection layer is arranged on the initial LED packaging bodies in a contact mode, is attached to the outline of each initial LED packaging body and extends; the first light antireflection layer is used for enabling first light rays with the wavelength smaller than a preset wavelength emitted by the initial LED packaging body to penetrate through; the equivalent refractive index of the first light antireflection layer is greater than the equivalent refractive index of the light diverting layer; preferably, the predetermined wavelength is 500 nm.
6. The light-emitting device according to claim 5, wherein the first light antireflection layer is further configured to reflect a second light ray having a wavelength within a predetermined wavelength band, the second light ray being a light ray that exits from the light conversion layer and reaches the first light antireflection layer; preferably, the predetermined wavelength band is in the range of 380nm to 780 nm.
7. The light-emitting device according to claim 5, further comprising:
a second light reflection reducing layer positioned on one side of the light conversion layer far away from the light turning layer, wherein the second light reflection reducing layer is used for allowing visible light to pass through and preventing ultraviolet light from passing through; preferably, the second light reflection reducing layer can transmit light in a wavelength range of 450nm to 780 nm.
8. The light-emitting device according to claim 7, wherein the second light antireflection layer comprises diffusing particles.
9. The light-emitting device according to claim 7, wherein the second light anti-reflection layer, the light conversion layer, the light diverting layer, and the first light anti-reflection layer each independently comprise one or more layers.
10. The light-emitting device according to claim 7, wherein the equivalent refractive index of the second light anti-reflection layer, the equivalent refractive index of the light conversion layer, the maximum equivalent refractive index of the light diverting layer, and the equivalent refractive index of the first light anti-reflection layer increase in this order.
11. The light-emitting device according to any one of claims 1 to 10, further comprising:
and the protective layer is positioned on one side of the second light antireflection layer far away from the light conversion layer.
12. A light emitting device according to any one of claims 1-10, wherein said LED is a micro-LED or a mini-LED.
13. The light-emitting device according to any one of claims 1 to 10, wherein the light-converting layer is a quantum dot color film.
14. A display device characterized by comprising the light-emitting device according to any one of claims 1 to 13.
CN202111188212.3A 2021-10-12 2021-10-12 Light emitting device and display apparatus including the same Pending CN113948503A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114754303A (en) * 2022-03-28 2022-07-15 重庆惠科金扬科技有限公司 Atmosphere lamp and display device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114754303A (en) * 2022-03-28 2022-07-15 重庆惠科金扬科技有限公司 Atmosphere lamp and display device
CN114754303B (en) * 2022-03-28 2023-09-29 重庆惠科金扬科技有限公司 Atmosphere lamp and display device

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