CN104766919A - Light emitting device and display - Google Patents

Abstract

The invention discloses a light-emitting device, which includes a substrate, a light source component, a light extraction layer and first optical particles. The light source component includes a light-emitting element and a packaging structure. The light extraction layer is disposed on the packaging structure, wherein the first optical particles protrude from the first surface of the light extraction layer. The first optical particles have a first refractive index, the light extraction layer has a second refractive index, and the packaging structure has a third refractive index. The first refractive index is greater than the refractive index of air, and the second refractive index is greater than the first refractive index and the third refractive index. This helps to avoid total reflection when light is incident from the light extraction layer to the outside of the light-emitting device, further improving the light extraction efficiency of the light-emitting device.

Description

Lighting devices and displays

technical field

The invention discloses a light-emitting device and a display, in particular a light-emitting device containing optical particles for improving light extraction rate and a display with the light-emitting device.

Background technique

The light-emitting element of the display can be a light-emitting diode (Light Emitting Diode, LED) made of semiconductor materials, or another organic light-emitting diode (Organic Light Emitting Diode, OLED) made of organic materials. Among them, light-emitting diodes are widely used in backlight modules of displays due to their advantages such as low power consumption, long component life, short fast response time, and small size. Organic light-emitting diodes have the advantages of wide viewing angle, high contrast, low power consumption, high response rate, full-color, and flexibility, so they are regarded as the most potential light-emitting elements for display.

However, current displays that use light-emitting diodes or organic light-emitting diodes as light-emitting elements generally have the problem of poor luminous efficiency, resulting in low brightness. The reason for the poor luminous efficiency is that only a small part of the light emitted by the light-emitting element can be emitted to the outside of the display, while the rest of the light will be absorbed due to reflection by the packaging structure inside the display.

At present, although some manufacturers add a light extraction layer to the packaging structure to prevent light from being reflected by the packaging structure, the refractive index between the light extraction layer and the outside of the display varies greatly, which greatly hinders the light from exiting the light extraction layer to the outside of the display.

Contents of the invention

In view of the above problems, the present invention provides a light-emitting device and a display including the light-emitting device, so as to solve the problem that the refractive index of the light extraction layer and the outside of the display changes too much, which greatly hinders the light from exiting the light extraction layer to the outside of the display.

The light-emitting device disclosed in the present invention includes a substrate, a light source component, a light extraction layer and first optical particles. The light source component includes a light emitting element and a packaging structure. The light emitting element is arranged on the substrate. The light-emitting element has a light-emitting surface, and the encapsulation structure is arranged on the light-emitting surface. The light extraction layer is arranged on the encapsulation structure of the light source component. The light extraction layer has opposite first surface and second surface, and the second surface faces the light source component. The first optical particles are embedded in the light extraction layer and protrude from the first surface. The first optical particle has a first refractive index, the light extraction layer has a second refractive index, and the packaging structure has a third refractive index. The first refractive index is greater than that of air, and the second refractive index is greater than the first refractive index and the third refractive index.

The display further disclosed by the present invention includes the aforementioned light-emitting device, an adhesive layer and a polarizer, and the adhesive layer is disposed on the first surface of the light extraction layer. The polarizer is disposed on the adhesive layer.

According to the light-emitting device and the display including the light-emitting device disclosed in the present invention, when the light generated by the light source component exits from the light-extracting layer to the outside of the light-emitting device, part of the light first enters the first optical particle from the light-extracting layer, and then Incident from the first optical particle to the outside of the light emitting device. Since the second refractive index of the light extraction layer is greater than the first refractive index of the first optical particle, and the first refractive index is greater than the refractive index of air, the light-emitting device has relatively moderate refractive index changes on the first surface, which helps to avoid When the light is incident from the light extraction layer to the outside of the light emitting device, total reflection occurs, which further improves the light extraction efficiency of the light emitting device.

The above descriptions about the content of the present invention and the following descriptions of the embodiments are used to demonstrate and explain the principles of the present invention, and provide further explanations of the scope of protection of the appended claims of the present invention.

Description of drawings

1 is a schematic cross-sectional view of a light emitting device according to a first embodiment of the present invention;

Figure 2 is a partially enlarged schematic diagram of Figure 1;

3 is a schematic diagram of the light path from the light generated by the light-emitting element to the outside of the light-emitting device according to the first embodiment of the present invention;

4 is a schematic cross-sectional view of a light emitting device according to a second embodiment of the present invention;

5 is a schematic cross-sectional view of a light emitting device according to a third embodiment of the present invention;

6 is a schematic cross-sectional view of a light emitting device according to a fourth embodiment of the present invention;

7 is a schematic cross-sectional view of a light emitting device according to a fifth embodiment of the present invention;

8 is a schematic cross-sectional view of a light emitting device according to a sixth embodiment of the present invention;

9 is a schematic cross-sectional view of a light emitting device according to a seventh embodiment of the present invention;

10 is a schematic cross-sectional view of a light emitting device according to an eighth embodiment of the present invention;

FIG. 11 is a three-dimensional schematic diagram of a display applying the light emitting device according to any embodiment of the present invention.

Among them, reference signs:

1 monitor

10 light emitting device

10a Substrate

20 Polarizers

30 adhesive layer

100 light source components

110 light emitting elements

111 light emitting surface

120 package structure

121 The first encapsulation layer

122 second encapsulation layer

121a first top surface

1210 anti-reflection structure

122a second top surface

123 buffer layer

200 light extraction layers

210 first surface

220 second surface

300 First Optical Particles

400 second optical particle

500 sides

B light

P the particle size of the first optical particle

V1 The intrinsic volume of the first optical particle

V2 Prominent volume of the first optical particle

Detailed ways

The detailed features and advantages of the present invention are described in detail below in the embodiments, the content of which is sufficient to enable any person familiar with the relevant technical field to understand the technical content of the present invention and implement it accordingly, and according to the content disclosed in this specification and the claims With the scope of protection and drawings, anyone familiar with the art can easily understand the related objects and advantages of the present invention. The following examples further illustrate the concept of the present invention in detail, but do not limit the scope of the present invention in any way.

Please refer to Figure 1. FIG. 1 is a schematic cross-sectional view of a light emitting device according to a first embodiment of the present invention. In this embodiment, the light emitting device 10 includes a substrate 10 a , a light source component 100 , a light extraction layer 200 and a plurality of first optical particles 300 .

The material of the substrate 10a is, for example, plastic or glass.

The light source assembly 100 is disposed on the substrate 10 a and includes a light emitting element 110 and a packaging structure 120 . The light-emitting element 110 is, for example, an organic light-emitting diode, which has a light-emitting surface 111 . The encapsulation structure 120 is disposed on the light emitting surface 111 of the light emitting element 110 and covers the light emitting element 110 . In detail, the encapsulation structure 120 includes a plurality of first encapsulation layers 121 and a plurality of second encapsulation layers 122 . The first encapsulation layers 121 and the second encapsulation layers 122 are stacked alternately, and adjacent first encapsulation layers 121 are in direct contact with the second encapsulation layers 122 . The first encapsulation layer 121 closest to the light-emitting element 110 is disposed on the light-emitting surface 111 and completely covers the light-emitting element 110 . In this embodiment, the encapsulation structure 120 is a thin film encapsulation structure (Thin Film Encapsulation, TFE) formed by stacking inorganic films and organic films in multiple layers, and the thickness of the encapsulation structure 120 is greater than or equal to 1 micron (μm) and less than Equal to 5 microns. Further, in this embodiment, the encapsulation structure 120 includes a plurality of first encapsulation layers 121 and a plurality of second encapsulation layers 122 in order to meet the requirement of good water and oxygen removal effect, but the present invention is not limited thereto. In other embodiments, the quantities of the first encapsulation layer 121 and the second encapsulation layer 122 can be adjusted, and details thereof will be further described later.

The material of the light extraction layer 200 is, for example, epoxy resin (Epoxy), polymethyl methacrylate (acrylic, PMMA), silicon (Silicon), ethylene terephthalate (PET), polyethylene naphthalate (PEN ), polycarbonate (PC), polyimide (PI), or indium tin oxide (ITO). Alternatively, the material of the light extraction layer 200 may be an organic-inorganic composite material, and the organic-inorganic composite material is titanium oxide-trimethoxysilylpropyl acrylate (TiOx-MSMA). In addition, the thickness of the light extraction layer 200 is greater than or equal to 0.1 μm and less than or equal to 30 μm.

The light extraction layer 200 has a first surface 210 and a second surface 220 opposite to each other. The second surface 220 faces the light source module 100 , and an outer surface of the encapsulation structure 120 directly contacts the second surface 220 of the light extraction layer 200 . In detail, the first encapsulation layer 121 closest to the light extraction layer 200 and the second encapsulation layer 122 closest to the light extraction layer 200 respectively have a first top surface 121a and a second top surface 122a facing the light extraction layer 200 . The first encapsulation layer 121 closest to the light extraction layer 200 directly contacts the second top surface 122a of the second encapsulation layer 122 closest to the light extraction layer 200 and completely covers the second top surface 122a. The second surface 220 of the light extraction layer 200 directly contacts the first top surface 121 a of the first encapsulation layer 121 closest to the light extraction layer 200 . In this embodiment, the first encapsulation layers 121 are all organic materials (for example, an organic water and oxygen blocking film, the refractive index is about 1.5), and the second encapsulation layers 122 are all inorganic materials (for example, an inorganic Water and oxygen blocking film, the refractive index is about 1.65). In this way, the organic material of the first encapsulation layer 121 helps to prevent the light extraction layer 200 from falling off from the first top surface 121a. In this embodiment, the first encapsulation layer 121 closest to the light extraction layer 200 completely covers the second top surface 122a of the second encapsulation layer 122 closest to the light extraction layer 200, so that the light extraction layer 200 is formed on the encapsulation structure 120 The time can be relatively flat, and the thickness can be relatively uniform, but it is not intended to limit the present invention. In other embodiments, the first encapsulation layer 121 closest to the light extraction layer 200 may not completely cover the surface of the second encapsulation layer 122 closest to the light extraction layer 200 regardless of the surface flatness and thickness uniformity of the light extraction layer 200. The details of the second top surface 122a will be further described later.

In this embodiment, the materials of the first encapsulation layer 121 and the second encapsulation layer 122 are not intended to limit the present invention. In other embodiments, the first encapsulation layer 121 can be an inorganic material (for example, an inorganic water and oxygen barrier film, the refractive index is about 1.65), and the second encapsulation layer 122 can be an organic material (for example, an organic Water and oxygen blocking film, the refractive index is about 1.5). Therefore, in the following description, the third refractive index of the encapsulation structure 120 will be regarded as about 1.65, but actually the encapsulation layer is less than or equal to 1.65, which should be within the protection scope of the present invention.

The first optical particle 300 is embedded in the light extraction layer 200 and protrudes from the first surface 210 . The material of the first optical particle 300 is, for example, an inorganic material, and the inorganic material may include magnesium fluoride (MgFx), silicon oxide (SiOx), aluminum oxide (AlOx), zinc oxide (ZnOx), titanium oxide (TiOx), selenium Zinc oxide (ZnSe) or zirconium oxide (ZrOx).

The optical properties and detailed structural features of the light extraction layer, the first optical particles, and the encapsulation layer will be described below. Please also refer to Figure 2. FIG. 2 is a partially enlarged schematic diagram of FIG. 1 .

The first optical particle 300 has a first refractive index (n1), and the first refractive index is greater than the refractive index of air (nair=1).

The light extraction layer 200 has a second refractive index ( n2 ), and the second refractive index ( n2 ) is greater than the first refractive index of the first optical particle 300 . The difference between the first refractive index and the second refractive index is greater than 0.01, and the second refractive index is greater than or equal to 1.65.

The encapsulation structure 120 has a third refractive index, and the second refractive index of the light extraction layer 200 is greater than the third refractive index. Thereby, it is helpful to extract the light generated by the light emitting element 110 into the light extraction layer 200 .

When the second refractive index of the light extraction layer 200 is greater than the first refractive index of the first optical particle 300, the light passing through the first optical particle 300 into the air is less likely to undergo total reflection, which helps to improve the light output of the light emitting device 10. Take out efficiency (Light Extraction Efficiency). For example, as shown in Table 1, when the second refractive index n2 of the light extraction layer 200 = 1.7 and the first refractive index n1 of the first optical particle 300 = 1.6, the light emitting device 10 has a relatively high brightness (the brightness unit is Candela per square meter, candelaper square meter, cd/m2).

When the light emitting device 10 is equipped with the first optical particles 300 , the luminous efficiency is higher than that of the light emitting device 10 without the first optical particles 300 . For example, as shown in Table 2, for the light-emitting device 10 with the second refractive index n2=1.7 and the third refractive index n3=1.5, when the first optical particle 300 is not configured, the brightness of the light-emitting device 10 is 42.6 cd/m ² . When the first optical particles 300 with a particle diameter of 150 nm and made of silicon oxide are disposed, the brightness of the light emitting device 10 is 56.5 cd/m ² . Experimental results prove that the light emitting device 10 with the first optical particle 300 can increase the brightness by at least 18%.

In addition to disposing the first optical particles 300 , adjusting the second refractive index of the light extraction layer 200 can further improve the light extraction efficiency of the light emitting device 10 . For example, as shown in Table 2, for the light emitting device 10 with the first refractive index n1=1.5 and the third refractive index n3=1.5, when the second refractive index n2=1.6, the brightness of the light emitting device 10 is 56.5 cd/m ² . When the second refractive index n2=1.7, the brightness of the light emitting device 10 is 58.3 cd/m ² . When the second refractive index n2=2.53, the brightness of the light emitting device 10 is 74.5 cd/m ² . Experimental results prove that when the first optical particles 300 are configured, the higher second refractive index is more helpful to further improve the light extraction efficiency of the light emitting device 10 .

In this embodiment, the particle size P of the first optical particle 300 is not limited to the above numerical value. Furthermore, the particle diameter P is greater than or equal to 0.1 micron and less than or equal to 20 microns. Thereby, the size of the first optical particle 300 can be properly adjusted to facilitate more light from the light extraction layer 200 to enter the first optical particle 300 .

In addition, the first optical particle 300 has a volume V1. The first optical particle 300 protrudes from the first surface 210 of the light extraction layer 200 to have a protruding volume V2 (as shown in FIG. 3 ). The ratio of the protruding volume V2 to the native volume V1 is greater than 0 and less than 1. In this way, the first optical particle 300 can have a sufficient cross-sectional area on the first surface 210 , which is helpful to further make the light incident from the light extraction layer 200 to the first optical particle 300 . Preferably, the ratio of the protruding volume V2 to the main volume V1 may be greater than 0.2 and less than or equal to 0.8. More preferably, the ratio of the protruding volume V2 to the main volume V1 may be 0.5.

In this embodiment, the first optical particles 300 protruding from the first surface 210 of the light extraction layer 200 are manufactured as follows: the light source assembly 100 is coated with the light extraction layer 200, and then the first optical particle 300 is sprayed by a spraycoater. The particles 300 are placed on the first surface 210 of the light extraction layer 200 , and then the light extraction layer 200 is cured to fix the first optical particles 300 on the light extraction layer 200 . The above-mentioned manufacturing method helps to prevent the first optical particles 300 from gathering inside the light extraction layer 200 , thereby avoiding the problem of uneven light scattering.

Please refer to Figure 3. 3 is a schematic diagram of the light path from the light generated by the light-emitting element to the outside of the light-emitting device according to the first embodiment of the present invention. In FIG. 3 , for convenience of illustration, only part of the light emitted by the light emitting element 110 is shown, but the light path is only for schematic illustration, and is not intended to limit the present invention.

When the light emitting element 110 emits at least one light B, the light B passes through the light emitting surface 111 of the light emitting element 110 and the encapsulation structure 120 and is incident into the light extraction layer 200 . Since the second refractive index n2 of the light extraction layer 200 is greater than the third refractive index n3 of the encapsulation structure 120, the light extraction layer 200 helps prevent the light B from entering the encapsulation structure 120 back to the light extraction layer 200 and causing total reflection ( Total internal reflection).

When the light B is emitted from the light extraction layer 200 to the outside of the light emitting device 10 , the light B first enters the first optical particle 300 from the light extraction layer 200 , and then the light B enters from the first optical particle 300 to the outside of the light emitting device 10 . It should be noted that the second refractive index n2 of the light extraction layer 200 is greater than the first refractive index n1 of the first optical particle 300 , and the first refractive index n1 is greater than the refractive index of air. Thereby, the light emitting device 10 has relatively moderate refractive index changes on the first surface 210 of the light extraction layer 200 .

The light emitting devices provided in the above embodiments are not intended to limit the present invention. Other embodiments of the present invention will be provided below.

In the first embodiment, the encapsulation structure includes a plurality of first encapsulation layers and a plurality of second encapsulation layers, but it is not intended to limit the present invention. Please refer to Figure 4. FIG. 4 is a schematic cross-sectional view of a light emitting device according to a second embodiment of the present invention. In this embodiment, the encapsulation structure 120 only includes two first encapsulation layers 121 and one second encapsulation layer 122 . The first encapsulation layer 121 closer to the substrate 10 a directly contacts the light emitting surface 111 of the light emitting element 110 . The side of the second encapsulation layer 122 away from the light extraction layer 200 directly contacts the lower first encapsulation layer 121 , and the first encapsulation layer 121 away from the substrate 10 a directly contacts the second top surface 122 a of the second encapsulation layer 122 . The second surface 220 of the light extraction layer 200 directly contacts the upper first encapsulation layer 121 .

In the first embodiment, the first encapsulation layer closest to the light extraction layer completely covers the second top surface of the second encapsulation layer closest to the light extraction layer, but this is not intended to limit the present invention. Please refer to Figure 5. FIG. 5 is a schematic cross-sectional view of a light emitting device according to a third embodiment of the present invention. In this embodiment, the first encapsulation layer 121 closest to the light extraction layer 200 does not completely cover the second top surface 122a of the second encapsulation layer 122 closest to the light extraction layer 200 .

In addition, in this embodiment, the encapsulation structure 120 includes a plurality of first encapsulation layers 121 and a plurality of second encapsulation layers 122 , but the present invention is not limited thereto. In other embodiments, the quantities of the first encapsulation layer 121 and the second encapsulation layer 122 can be adjusted according to requirements.

Please refer to Figure 6. 6 is a schematic cross-sectional view of a light emitting device according to a fourth embodiment of the present invention. Since this embodiment is similar to the first embodiment, the following embodiments only describe the differences.

In this embodiment, the light extraction layer 200 completely covers the light emitting element 110 and the encapsulation structure 120 of the light source assembly 100 . Thereby, it is helpful to improve the light extraction efficiency of the light emitting device 10 at one side 500 .

In addition, in this embodiment, the encapsulation structure 120 includes a plurality of first encapsulation layers 121 and a plurality of second encapsulation layers 122 , but the present invention is not limited thereto. In other embodiments, the quantities of the first encapsulation layer 121 and the second encapsulation layer 122 can be adjusted according to requirements.

Please refer to Figure 7. 7 is a schematic cross-sectional view of a light emitting device according to a fifth embodiment of the present invention. Since the present embodiment is similar to the fourth embodiment, the following embodiments only describe the differences.

In this embodiment, the light emitting device 10 further includes a buffer layer 123 . The buffer layer 123 directly contacts the first encapsulation layer 121 , and the buffer layer 123 completely covers the encapsulation structure 120 . The material of the first encapsulation layer 121 is an inorganic material, and the materials of the second encapsulation layer 122 and the buffer layer 123 are organic materials. The second surface 220 of the light extraction layer 200 directly contacts the buffer layer 123 . Since the light extraction layer 200 generally contains organic materials, it has poor adhesion to inorganic materials. Therefore, when the first encapsulation layer 121 is made of an inorganic material, it is not conducive to the firm attachment of the light extraction layer 200 to the first top surface 121a, so a buffer layer 123 is added to prevent the light extraction layer 200 from directly contacting the first encapsulation of the inorganic material. Layer 121. Thereby, when the light extraction layer 200 is formed on the encapsulation structure 120, it can be relatively flat, the thickness can be relatively uniform, and the adhesion can also be better.

In addition, in this embodiment, the buffer layer 123 completely covers the first encapsulation layers 121 and the second encapsulation layers 122 , but the present invention is not limited thereto. In other embodiments, the coverage area of the buffer layer 123 depends on the coverage area of the light extraction layer 200 , so the buffer layer 123 may only cover part of the first encapsulation layer 121 .

Furthermore, in this embodiment, the encapsulation structure 120 includes a plurality of first encapsulation layers 121 and a plurality of second encapsulation layers 122 , but the present invention is not limited thereto. In other embodiments, the quantities of the first encapsulation layer 121 and the second encapsulation layer 122 can be adjusted according to requirements.

Please refer to Figure 8. 8 is a schematic cross-sectional view of a light emitting device according to a sixth embodiment of the present invention. Since this embodiment is similar to the first embodiment, the following embodiments only describe the differences.

In this embodiment, the light emitting device 10 further includes a plurality of second optical particles 400 . The second optical particle 400 is disposed in the light extraction layer 200 and keeps a distance from the first surface 210 . The second optical particle 400 has a fourth refractive index, the fourth refractive index is different from the second refractive index of the light extraction layer 200, and the fourth refractive index may be the same as the first refractive index. Thereby, part of the light can be scattered by the second optical particle 400 , which helps to adjust the incident angle of the part of the light from the light extraction layer 200 to the outside of the light-emitting device 10 , and further prevents the total reflection of the part of the light on the first surface 210 .

In addition, in this embodiment, the encapsulation structure 120 includes a plurality of first encapsulation layers 121 and a plurality of second encapsulation layers 122 , but the present invention is not limited thereto. In other embodiments, the quantities of the first encapsulation layer 121 and the second encapsulation layer 122 can be adjusted according to requirements.

Please refer to Figure 9. FIG. 9 is a schematic cross-sectional view of a light emitting device according to a seventh embodiment of the present invention. Since the present embodiment is similar to the sixth embodiment, the following embodiments only describe the differences.

In this embodiment, the second optical particles 400 disposed in the light extraction layer 200 are in contact with the second surface 220 of the light extraction layer 200 . In this way, the light-emitting device 10 has relatively moderate refractive index changes on the second surface 220 of the light extraction layer 200, which helps to avoid total reflection of part of the light from the encapsulation structure 120 when it enters the light-extraction layer 200, and further improves the light-emitting device 10. light extraction efficiency.

In addition, in this embodiment, the encapsulation structure 120 includes a plurality of first encapsulation layers 121 and a plurality of second encapsulation layers 122 , but the present invention is not limited thereto. In other embodiments, the quantities of the first encapsulation layer 121 and the second encapsulation layer 122 can be adjusted according to requirements.

Please refer to Figure 10. 10 is a schematic cross-sectional view of a light emitting device according to an eighth embodiment of the present invention. Since this embodiment is similar to the first embodiment, the following embodiments only describe the differences.

In this embodiment, the first top surface 121 a of the first encapsulation layer 121 directly contacting the second surface 220 of the light extraction layer 200 has an anti-reflection structure 1210 . The anti-reflection structure 1210 is, for example, a sub-wavelength structure such as a microlens array or a cone array. This contributes to improving the light extraction efficiency of the light emitting device 10 .

In addition, in this embodiment, the encapsulation structure 120 includes a plurality of first encapsulation layers 121 and a plurality of second encapsulation layers 122 , but the present invention is not limited thereto. In other embodiments, the quantities of the first encapsulation layer 121 and the second encapsulation layer 122 can be adjusted according to requirements.

The light-emitting devices disclosed in the above embodiments and other embodiments can all be mounted in a display. Please refer to Figure 11. FIG. 11 is a schematic perspective view of a display including a light emitting device according to the present invention. As shown in FIG. 11 , a display 1 includes the light emitting device 10 mentioned in any of the above embodiments and other embodiments, a polarizer 20 and an adhesive layer 30 . The adhesive layer 30 is disposed on the first surface 210 of the light extraction layer 200 . The polarizer 20 is disposed on the adhesive layer 30 and fixed on the first surface 210 . The adhesive layer 30 is, for example, optical clear adhesive (OCA). The display 1 is, for example, an active-matrix organic light-emitting diode (AMOLED) display.

To sum up, in the light-emitting device and the display including the light-emitting device disclosed in the present invention, when the light generated by the light source component enters the outside of the light-emitting device from the light-extracting layer, part of the light first enters the first optical particle from the light-extracting layer , and then incident from the first optical particle to the outside of the light-emitting device. Since the second refractive index of the light extraction layer is greater than the first refractive index of the first optical particle, and the first refractive index is greater than the refractive index of air, the light-emitting device has relatively moderate refractive index changes on the first surface, which helps to avoid When the light is incident from the light extraction layer to the outside of the light emitting device, total reflection occurs, which further improves the light extraction efficiency of the light emitting device.

Although the present invention is disclosed above with the foregoing preferred embodiments, it is not intended to limit the present invention. Any person familiar with the art may make some changes and modifications without departing from the spirit and scope of the present invention. Retouching, but these corresponding changes and modifications should belong to the scope of protection of the appended claims of the present invention.

Claims (21)

1. A lighting device, characterized in that it comprises: a substrate; A light source assembly, including a light emitting element and a packaging structure, the light emitting element is arranged on the substrate, the light emitting element has a light-emitting surface, and the packaging structure is arranged on the light-emitting surface; a light extraction layer disposed on the packaging structure of the light source module, the light extraction layer has a first surface and a second surface opposite to each other, and the second surface faces the light source module; and a plurality of first optical particles embedded in the light extraction layer and protruding from the first surface; Wherein, the first optical particles have a first refractive index, the light extraction layer has a second refractive index, the encapsulation structure has a third refractive index, the first refractive index is greater than the refractive index of air, and the first The second refractive index is greater than the first refractive index and the third refractive index. 2. The light emitting device according to claim 1, wherein the encapsulation structure has an outer surface, and the outer surface directly contacts the second surface of the light extraction layer. 3. The light-emitting device according to claim 1, wherein the encapsulation structure comprises a first encapsulation layer and a second encapsulation layer, the first encapsulation layer directly contacts the second encapsulation layer, and the light extraction layer The second surface directly contacts the first encapsulation layer. 4. The light-emitting device according to claim 1, wherein the packaging structure comprises a plurality of first packaging layers and a plurality of second packaging layers, and the first packaging layers and the second packaging layers are stacked alternately, And the adjacent first encapsulation layer is in direct contact with the second encapsulation layer, and the second surface of the light extraction layer directly contacts the first encapsulation layer closest to the light extraction layer. 5. The light-emitting device according to claim 4, wherein the first encapsulation layer closest to the light extraction layer has a first top surface facing the light extraction layer, and the second surface of the light extraction layer directly contacting the first top surface, and the first top surface has an anti-reflection structure. 6. The light-emitting device according to claim 4, wherein the second encapsulation layer closest to the light extraction layer has a second top surface facing the light extraction layer, and the second encapsulation layer closest to the light extraction layer The first encapsulation layer completely covers the second top surface. 7. The light-emitting device according to claim 4, wherein the materials of the first encapsulation layers are all inorganic materials, and the materials of the second encapsulation layers are all organic materials. 8. The light-emitting device according to claim 4, wherein the materials of the first encapsulation layers are all organic materials, and the materials of the second encapsulation layers are all inorganic materials. 9. The light-emitting device according to claim 1, further comprising a buffer layer, wherein the encapsulation structure comprises a plurality of first encapsulation layers and a plurality of second encapsulation layers, the first encapsulation layers and the The second encapsulation layers are alternately stacked, the adjacent first encapsulation layer is in direct contact with the second encapsulation layer, the buffer layer is in direct contact with the first encapsulation layer closest to the light extraction layer, and the first encapsulation layer of the light extraction layer is The two surfaces directly contact the buffer layer. 10. The light emitting device according to claim 9, wherein the buffer layer completely covers the encapsulation structure. 11. The light-emitting device according to claim 9, wherein the materials of the first encapsulation layers are all inorganic materials, and the materials of the second encapsulation layers and the buffer layer are both organic materials. 12. The light emitting device according to claim 1, wherein the light extraction layer completely covers the light source component. 13 . The light-emitting device according to claim 1 , wherein the first optical particles each have a particle diameter greater than or equal to 0.1 micrometers and less than or equal to 20 micrometers. 14. The light-emitting device according to claim 1, wherein the material of the first optical particles is an inorganic material, and the inorganic material includes magnesium fluoride, silicon oxide, aluminum oxide, zinc oxide, titanium oxide, selenium Zinc or Zirconia. 15. The light-emitting device according to claim 1, wherein the material of the light extraction layer is an organic-inorganic composite material, and the second refractive index is greater than or equal to 1.65. 16. The light-emitting device according to claim 1, wherein the first optical particles each have a volume, and respectively protrude from the first surface to have a protruding volume, wherein the protruding volume and the protruding volume The ratio is greater than 0 and less than 1. 17. The light emitting device according to claim 16, wherein the ratio of the protruding volume to the intrinsic volume is 0.5. 18. The light-emitting device according to claim 1, further comprising a plurality of second optical particles, wherein the second optical particles are disposed in the light extraction layer and keep a distance from the first surface. 19. The light-emitting device according to claim 18, wherein the second optical particles have a fourth refractive index, wherein the fourth refractive index is different from the second refractive index of the light extraction layer. 20. The light emitting device according to claim 18, wherein the second optical particles are tangent to the second surface of the light extraction layer. 21. A display, characterized in that it comprises: A light emitting device as claimed in any one of claims 1 to 20; an adhesive layer disposed on the first surface; and A polarizer is arranged on the adhesive layer.