Light extraction structure and light emitting device

Abstract

The application discloses a light extraction structure and a light emitting device. The light extraction structure comprises a base body, wherein the base body comprises at least one cavity; at least two kinds of charged scattering particles with different particle sizes are arranged in the cavity; a first electrode is arranged on a first side of the cavity, a second electrode is arranged on a second side of the cavity, and the first electrode and the second electrode are parallel to each other; and the first electrode and the second electrode are used for applying a voltage to the charged scattering particles, so that the charged scattering particles are arranged in a set arrangement mode. The application can meet the light emission needs of different colors of light and improve the light extraction efficiency.

Description

Technical Field

[0001] This invention relates to the field of light-emitting technology, and in particular to a light extraction structure and a light-emitting device. Background Technology

[0002] With the development of technology, people have increasingly higher requirements for the light extraction efficiency of light-emitting devices. To improve the light extraction efficiency of light-emitting devices, a light extraction structure is generally set on the light-emitting side of the device to reduce the loss caused by the waveguide mode and substrate mode of the device to the quantum effect. However, the existing light extraction structure has a fixed light extraction function, which cannot meet the light extraction requirements of different colors of light, nor does it have adjustability. Summary of the Invention

[0003] This invention provides a light extraction structure and a light-emitting device to meet different light extraction needs and improve light extraction efficiency.

[0004] According to one aspect of the present invention, a light extraction structure is provided, comprising:

[0005] The matrix includes at least one cavity; the cavity contains at least two types of charged scattering particles of different sizes and a solution.

[0006] A first electrode is provided on the first side of the cavity, and a second electrode is provided on the second side of the cavity. The first electrode and the second electrode are parallel to each other.

[0007] The first and second electrodes are used to apply voltage to the charged scattering particles, causing the charged scattering particles to arrange themselves in a predetermined pattern.

[0008] Optionally, the arrangement can be set to arrange the particles in ascending order of size along the direction from the first electrode to the second electrode, or the arrangement can be set to arrange the particles in descending order of size along the direction from the first electrode to the second electrode, or, when there are at least three different sizes of charged scattering particles in the cavity, the arrangement along the direction from the first electrode to the second electrode can be set to place the charged scattering particle with the largest size in the middle position.

[0009] Optionally, a third electrode is provided on the third side of each cavity, and a fourth electrode is provided on the fourth side of each cavity; the third side and the fourth side are arranged opposite to each other; the third electrode and the fourth electrode are parallel, and the third electrode is perpendicular to the first electrode.

[0010] The third and fourth electrodes are used to apply voltage to the charged scattering particles and adjust their position along the direction from the third electrode to the fourth electrode.

[0011] Optionally, the substrate includes a first light-transmitting layer and a second light-transmitting layer;

[0012] The first surface of the first light-transmitting layer includes at least one groove, and the second light-transmitting layer is bonded to the first surface of the first light-transmitting layer, with charged scattering particles disposed in the groove.

[0013] The solution is a transparent liquid.

[0014] Optionally, the substrate includes a transparent adhesive layer and at least one closed capsule disposed within the transparent adhesive layer, with charged scattering particles disposed within the capsule.

[0015] Optionally, the transparent adhesive layer includes two or more closed capsules, and the multiple capsules can share the first electrode and the second electrode; the multiple capsules are arranged vertically or horizontally along the direction from the first electrode to the second electrode.

[0016] According to another aspect of the present invention, a light-emitting device is provided, comprising:

[0017] The light-emitting structural layer and the light extraction structure described in any embodiment of the present invention;

[0018] The light extraction structure is located on the light-emitting side of the light-emitting structure layer, and the first electrode of the light extraction structure is parallel to the light-emitting structure layer.

[0019] Optionally, the light-emitting structure layer includes at least one light-emitting unit group, each light-emitting unit group includes at least one light-emitting unit, and the light-emitting units included in the light-emitting unit group have the same light-emitting color;

[0020] Each light-emitting unit group is correspondingly set with a cavity in the light extraction structure; the vertical projection of the cavity in the light-emitting structure layer covers the light-emitting unit group.

[0021] Optionally, when the light extraction structure includes a third electrode and a fourth electrode, the width of the cavity in the vertical projection of the light-emitting structure layer along the direction from the third electrode to the fourth electrode is greater than the width of the light-emitting unit group; the light-emitting unit is a white light-emitting unit, or the light-emitting unit is at least a dual-color light-emitting unit.

[0022] Optionally, the light-emitting device further includes a driving substrate and an encapsulation layer, with the light-emitting structure layer disposed between the driving substrate and the encapsulation layer;

[0023] The light extraction structure is located on the side of the encapsulation layer away from the light-emitting structure layer, or the light extraction structure is located on the side of the driving substrate away from the light-emitting structure layer.

[0024] In the light extraction structure provided in this embodiment of the invention, the substrate includes at least one cavity; the cavity contains at least two types of charged scattering particles with different particle sizes; a first electrode and a second electrode are disposed on a first side of the cavity, and the first electrode and the second electrode are parallel to each other; the first electrode and the second electrode are used to apply voltage to the charged scattering particles, so that the charged scattering particles are arranged in a predetermined arrangement. The light extraction structure of this embodiment adjusts the arrangement of the charged scattering particles in the cavity by adjusting the voltage on the first electrode and the second electrode, thereby achieving different scattering effects, meeting the light extraction needs of different colors of light, and improving the light extraction efficiency.

[0025] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of an optical extraction structure provided in Embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention;

[0029] Figure 3 This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention;

[0030] Figure 4 This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention;

[0031] Figure 5 This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention;

[0032] Figure 6 This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention;

[0033] Figure 7 This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention;

[0034] Figure 8 This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention;

[0035] Figure 9This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention;

[0036] Figure 10 This is a schematic diagram of the structure of a light-emitting device provided in Embodiment 2 of the present invention;

[0037] Figure 11 This is a schematic diagram of another light-emitting device provided in Embodiment 2 of the present invention. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0040] Example 1

[0041] This invention provides an optical extraction structure. Figure 1 This is a schematic diagram of an optical extraction structure provided in Embodiment 1 of the present invention, for reference. Figure 1 The light extraction structure includes: a substrate 100, the substrate 100 including at least one cavity 110; the cavity 110 is provided with at least two kinds of charged scattering particles 111 of different sizes and a solution 112; a first electrode 101 is provided on a first side of the cavity 110, and a second electrode 102 is provided on a second side of the cavity 110, the first electrode 101 and the second electrode 102 are parallel to each other; the first electrode 101 and the second electrode 102 are used to apply a voltage to the charged scattering particles 111, so that the charged scattering particles 111 are arranged in a predetermined arrangement.

[0042] The substrate 100 is made of a light-transmitting material, and both the first electrode 101 and the second electrode 102 are light-transmitting electrodes. The solution 112 is a transparent liquid. For example, the solution 112 can be an aromatic hydrocarbon or a halogenated hydrocarbon; the first electrode 101 and the second electrode 102 can be electrodes made of metal oxides such as indium tin oxide. The first electrode 101 and the second electrode 102 can be disposed inside the substrate 100 or on the surface of the substrate 100. The substrate 100 may include one, two, or more cavities 110. Charged scattering particles 111 of different sizes can carry the same type of charge or different types of charge. When charged scattering particles 111 of different sizes carry the same type of charge, the amount of charge carried by charged scattering particles 111 of different sizes is different. After the first electrode 101 and the second electrode 102 apply voltage to the charged scattering particles 111, the charges of different magnitudes move at different speeds or in different directions, and therefore their positions are different. The arrangement of the charged scattering particles 111 can be changed by adjusting the voltage on the first electrode 101 and the second electrode 102.

[0043] According to the empirical formula for Rayleigh scattering:

[0044]

[0045] Among them, P scattering λ is the intensity of the scattered light; d is the diameter of the scattering particle; n is the refractive index of the matrix 100 in air; λ is the wavelength of the incident light wave; I incident The incident light intensity is denoted as .

[0046] It is known that the scattering intensity is directly proportional to the sixth power of the diameter of the scattering particle, indicating that the size of the scattering particle has a significant impact on the intensity of the scattered light. According to the Rayleigh scattering formula, the intensity of the scattered light is directly proportional to the particle size of the scattering particle, and the particle size of the scattering particle with the strongest scattering effect varies for different wavelengths of light. For example, for longer wavelengths of light, a larger particle size is required to obtain a greater scattered light intensity. Furthermore, the scattering effect of charged scattering particles 111 of the same particle size on the same wavelength of light varies depending on their position in the cavity 110. Charged scattering particles 111 of different particle sizes can be arranged in a predetermined pattern according to the light output requirements. For example, if it is necessary to enhance the scattered light intensity of red light, charged scattering particles 111 that enhance the scattered light intensity of red light can be arranged at the position with the strongest scattering in the cavity 110, while charged scattering particles 111 of other unwanted colors can be arranged at the position with weaker scattering.

[0047] In the light extraction structure provided in this embodiment of the invention, the substrate 100 includes at least one cavity 110; the cavity 110 is provided with at least two kinds of charged scattering particles 111 of different sizes; a first electrode 101 and a second electrode 102 are provided on the first side of the cavity 110, and the first electrode 101 and the second electrode 102 are parallel to each other; the first electrode 101 and the second electrode 102 are used to apply voltage to the charged scattering particles 111, so that the charged scattering particles 111 are arranged in a set arrangement. The light extraction structure of this embodiment adjusts the voltage on the first electrode 101 and the second electrode 102 to adjust the arrangement of the charged scattering particles in the cavity 110, thereby achieving different scattering effects, meeting the light extraction needs of different colors of light, and improving the light extraction efficiency.

[0048] Figure 2 This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention. Figure 3 This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention. Figure 4 This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention. Optionally, refer to... Figure 2 The arrangement is set as follows: along the direction from the first electrode 101 to the second electrode 102, the particles are arranged in ascending order of size; or, refer to... Figure 3 The arrangement is set as follows: along the direction from the first electrode 101 to the second electrode 102, the particles are arranged in descending order of size; or, refer to... Figure 4 When at least three different sizes of charged scattering particles 111 are provided in the cavity 110, the arrangement of the charged scattering particles 111 with the largest particle size is set in the middle position along the direction from the first electrode 101 to the second electrode 102.

[0049] In this system, the scattering effect of the same charged scattering particle 111 on light of the same wavelength varies depending on its position within the cavity 110. Furthermore, charged scattering particles 111 of different sizes arranged in different orders also exhibit different scattering effects and light extraction efficiencies. The charged scattering particles 111 can be arranged in a predetermined pattern according to the light extraction requirements. For example, if it is necessary to adjust the color temperature of white light, at least three different sizes of charged scattering particles 111 can be arranged in a specific order within the cavity to achieve different scattering effects on different wavelengths of white light, thereby adjusting the color temperature of the white light. For example, charged scattering particles 111 that have a strong scattering effect on red light can be arranged at the position with the strongest scattering effect, charged scattering particles 111 that have a strong scattering effect on green light can be arranged at the position with the strongest scattering effect, and charged scattering particles 111 that have a strong scattering effect on blue light can be arranged at the position with the weakest scattering effect, so that the scattering intensity of red light, green light and blue light is: red light > green light > blue light, thereby increasing the proportion of red light and green light in white light and adjusting the color temperature of white light.

[0050] Optional, Figure 5 This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention, for reference. Figure 5 Each cavity 110 is provided with a third electrode 103 on its third side and a fourth electrode 104 on its fourth side; the third and fourth sides are arranged opposite to each other; the third electrode 103 and the fourth electrode 104 are parallel, and the third electrode 103 is perpendicular to the first electrode 101; the third electrode 103 and the fourth electrode 104 are used to apply voltage to the charged scattering particles 111 and adjust the position of the charged scattering particles 111 along the direction from the third electrode 103 to the fourth electrode 103.

[0051] Since the charged scattering particles 111 of different sizes carry different amounts of charge or different types of charge, when a voltage is applied to the third electrode 103 and the fourth electrode 104, the charged scattering particles 111 of different sizes move at different speeds or in different directions between the third electrode 103 and the fourth electrode 104, and therefore their positions differ. The voltage on the third electrode 103 and the fourth electrode 104 can be adjusted according to different light extraction requirements, so that the charged scattering particles 111 of different sizes have different arrangement positions between the third electrode 103 and the fourth electrode 104. Through the cooperation of the first electrode 101, the second electrode 102, the third electrode 103, and the fourth electrode 104, the arrangement of the charged scattering particles 111 of different sizes can be more diverse, which can meet the light extraction requirements of different application scenarios.

[0052] For example, by adjusting the voltage of the third electrode 103 and the fourth electrode 104, the movement of charged scattering particles 111 is controlled, so that unwanted charged scattering particles 111 are located at the edge of the cavity 110 near the third electrode 103 or at the edge of the cavity 110 near the fourth electrode 104, while only the desired scattering particles are arranged between the first electrode 101 and the second electrode 102. For example, when the light-emitting screen corresponding to the light extraction structure emits only green light, the charged scattering particles 111 that are not suitable for green light can be moved to the edge of the cavity 110 near the third electrode 103 or at the edge of the cavity 110 near the fourth electrode 104, leaving only the edges of the cavity 110 near the third electrode 103 or at the edge of the cavity 110 near the fourth electrode 104 suitable for green light in the middle region of the cavity 110 to scatter green light and improve the light extraction efficiency of green light.

[0053] Optional, Figure 6 This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention, for reference. Figure 6The substrate includes a first light-transmitting layer 120 and a second light-transmitting layer 130; the first surface of the first light-transmitting layer 120 includes at least one groove 121, the second light-transmitting layer 130 is bonded to the first surface of the first light-transmitting layer 120, and charged scattering particles 111 are disposed in the groove 121.

[0054] Specifically, a first electrode 101 can be formed on one surface of the first light-transmitting layer 120, and a groove 121 can be formed on the other surface. Charged scattering particles 111 are then filled into the groove 121. The second light-transmitting layer 130 is then bonded to the first light-transmitting layer 120. Before bonding the second light-transmitting layer 130 to the first light-transmitting layer 120, a second electrode 102 can be formed on the surface of the second light-transmitting layer 130. Alternatively, after the first light-transmitting layer 120 and the second light-transmitting layer 130 are bonded, the first electrode 101 and the second electrode 102 can be respectively disposed on the surfaces of the first light-transmitting layer 120 and the second light-transmitting layer 130. After the first light-transmitting layer 120 and the second light-transmitting layer 130 are bonded, one groove 121 corresponds to one cavity.

[0055] also, Figure 6 The third and fourth electrodes are not shown in the figure. The third and fourth electrodes can be formed directly on the surface of the first light-transmitting layer 120 before the charged scattering particles 111 are filled in the groove, or they can be set on the surface of the first light-transmitting layer 120 after the first light-transmitting layer 120 and the second light-transmitting layer 130 are attached.

[0056] Optional, Figure 7 This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention, for reference. Figure 7 The substrate includes a transparent adhesive layer 140 and at least one closed capsule 141 disposed within the transparent adhesive layer 140, wherein charged scattering particles 111 and solution 112 are disposed within the capsule 141.

[0057] Specifically, each capsule 141 is a cavity. Charged scattering particles 111 and a transparent solution 112 can be filled into the capsule 141 first. After sealing the capsule 141, it is fixed by a transparent adhesive layer 142, arranging the capsules 141 according to a predetermined pattern. Then, electrodes are placed inside or on the surface of the transparent adhesive layer 141. When placing electrodes inside the transparent adhesive layer 141, grooves can be formed on the surface of the transparent adhesive layer 141, and the electrodes can be placed within these grooves.

[0058] In addition, refer to Figure 7 A first electrode 101, a second electrode 102, a third electrode 103, and a fourth electrode 104 are disposed on the transparent adhesive layer 140. Each capsule 141 may be provided with an independent first electrode 101, second electrode 102, third electrode 103, and fourth electrode 104, or... Figure 8This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention, for reference. Figure 8 Multiple capsules 141 can share the first electrode 101 and the second electrode 102. Optionally, the multiple capsules 141 can be arranged vertically or horizontally along the direction from the first electrode 101 to the second electrode 102; or Figure 9 This is a schematic diagram of another optical extraction structure provided in Embodiment 1 of the present invention, for reference. Figure 9 Multiple cysts 141 may also share the third electrode 103 and the fourth electrode 104. The multiple cysts 141 may be arranged vertically or horizontally along the direction from the third electrode 103 to the fourth electrode.

[0059] It should be noted that, Figure 9 and Figure 7 and Figure 8 These are cross-sectional schematic diagrams from different directions. If the direction from the first electrode to the second electrode is the first direction, and the direction from the third electrode to the fourth electrode is the second direction, then... Figure 7 and Figure 8 The cross-section shown is parallel to the first and second directions. Figure 9 The cross-section shown is perpendicular to the first direction.

[0060] Example 2

[0061] Based on the above embodiments, this invention also provides a light-emitting device. Figure 10 This is a schematic diagram of the structure of a light-emitting device provided in Embodiment 2 of the present invention, for reference. Figure 10 The phototherapy device includes: a light-emitting structure layer 220 and a light extraction structure as described in any embodiment of the present invention; the light extraction structure 200 is disposed on the light-emitting side of the light-emitting structure layer 220, and the first electrode 101 of the light extraction structure is parallel to the light-emitting structure layer 220.

[0062] The light-emitting structure layer 220 may include one or more light-emitting units. Each light-emitting unit may be an organic light-emitting unit. The light-emitting unit may include a first electrode layer, an organic layer, and a second electrode layer. When the light-emitting structure layer 220 includes one light-emitting unit, the light extraction structure corresponding to the light-emitting structure layer 220 may include only one cavity 110. One light-emitting unit may correspond to one cavity 110, or several light-emitting units of the same color may correspond to one cavity 110.

[0063] The light extraction structure of this embodiment can adjust the arrangement of charged scattering particles 111 in the cavity 110 by adjusting the voltage on the first electrode 101 and the second electrode 102, thereby achieving different scattering effects, meeting the light emission requirements of the light-emitting structure layer 220, and improving the light extraction efficiency.

[0064] Figure 11This is a schematic diagram of another light-emitting device provided in Embodiment 2 of the present invention. Optional, refer to... Figure 11 The light-emitting structure layer 220 includes at least one light-emitting unit group 201, each light-emitting unit group 201 includes at least one light-emitting unit 202, and the light-emitting units 202 included in the light-emitting unit group 201 have the same light-emitting color; each light-emitting unit group 201 is correspondingly disposed with a cavity in the light extraction structure; the vertical projection of the cavity in the light-emitting structure layer 220 covers the light-emitting unit group 201.

[0065] Since the charged scattering particles 111 within a cavity can only be arranged in one configuration at a time, a cavity needs to scatter the light emitted by light-emitting units 202 of the same color. For example, a group of light-emitting units 201 may include one, two, or more light-emitting units 202. The light-emitting units 202 in a group of light-emitting units 201 can simultaneously emit white light, simultaneously emit yellow light, or simultaneously emit red or green light, etc. By assigning one cavity to the same group of light-emitting units 201 with the same color, the number of cavities in the light extraction structure can be reduced, thus lowering the manufacturing difficulty of the light extraction structure.

[0066] Optionally, when the light extraction structure includes a third electrode and a fourth electrode, the width of the cavity in the vertical projection of the light-emitting structure layer 220 along the direction from the third electrode to the fourth electrode is greater than the width of the light-emitting unit group 201.

[0067] In this way, by adjusting the voltage of the third and fourth electrodes of the light extraction structure, unwanted charged scattering particles 111 can be moved to the edge of the cavity adjacent to the third or fourth electrode. The width of the vertical projection of the cavity on the light-emitting structure layer 220 is set to be greater than the width of the light-emitting unit group, so as to ensure that the charged scattering particles 111 located at the edge will not affect the normal light output.

[0068] Optionally, the light-emitting unit 202 is a white light-emitting unit, or the light-emitting unit 202 is at least a dual-color light-emitting unit.

[0069] Specifically, when the light-emitting unit 202 is a white light-emitting unit, the arrangement of the charged scattering particles 111 in the cavity can be adjusted according to the color temperature and other requirements of the white light, so that different colors of light in the white light are scattered to different degrees, and the proportion of different colors of light in the white light is adjusted, thereby ensuring that the white light emitted by the light-emitting device meets the requirements. In this embodiment, only the arrangement of the charged scattering particles 111 in the light extraction structure needs to be adjusted to adjust the color temperature of the white light emitted, etc., without changing the material or structure of the white light-emitting unit, thus reducing the manufacturing cost and process difficulty of the white light-emitting unit.

[0070] For example, when the light-emitting unit 202 is a dual-color light-emitting unit, one light-emitting unit 202 may include two sub-light-emitting units stacked along the thickness direction of the light-emitting device, and the two sub-light-emitting units emit different colors. The light-emitting device can drive one sub-light-emitting unit to emit light of one color as needed, or it can drive two sub-light-emitting colors to emit light simultaneously as needed, emitting mixed-color light. When only one sub-light-emitting unit emits light, the charged scattering particles 111 corresponding to the emission color of the light-emitting unit 202 can be placed in the central region of the cavity, and the unwanted charged scattering particles 111 can be placed in the edge region to achieve light scattering of that color and improve the light extraction efficiency of that color. When two sub-light-emitting units emit light simultaneously, the positions of the charged scattering particles 111 corresponding to the two types of sub-light-emitting units can be adjusted to adjust the scattering intensity of the two colors of light, thereby achieving different light extraction effects.

[0071] Optionally, the light-emitting device further includes a driving substrate 210 and an encapsulation layer 230, with a light-emitting structure layer 220 disposed between the driving substrate 210 and the encapsulation layer 230; the light extraction structure is disposed on the side of the encapsulation layer 230 away from the light-emitting structure layer 220, or the light extraction structure is disposed on the side of the driving substrate 210 away from the light-emitting structure layer 220.

[0072] Among them, reference Figure 11 When the light-emitting structure layer 220 emits light towards the encapsulation layer 230, the light extraction structure is located on the side of the encapsulation layer 230 away from the light-emitting structure layer 220. (Reference) Figure 10 When the light-emitting structure layer 220 emits light to the driving substrate 210, the light extraction structure is disposed on the side of the driving substrate 210 away from the light-emitting structure layer 220.

[0073] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0074] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A light extraction structure, characterized in that, include: A matrix comprising at least one cavity; wherein at least two types of charged scattering particles of different sizes and a solution are disposed in the cavity; A first electrode is provided on the first side of the cavity, and a second electrode is provided on the second side of the cavity, with the first electrode and the second electrode being parallel to each other; The first electrode and the second electrode are used to apply a voltage to the charged scattering particles, so that the charged scattering particles are arranged in a predetermined arrangement. The size of the charged scattering particles that have the strongest scattering effect on light of different wavelengths is different; Charged scattering particles of different sizes can achieve different scattering effects on light of different wavelengths, meet the light extraction needs of different colors of light, and improve the light extraction efficiency of different colors of light. A third electrode is provided on the third side of each cavity, and a fourth electrode is provided on the fourth side of each cavity; the third side and the fourth side are arranged opposite to each other; the third electrode and the fourth electrode are parallel, and the third electrode is perpendicular to the first electrode. The third electrode and the fourth electrode are used to apply a voltage to the charged scattering particle and adjust the position of the charged scattering particle along the direction from the third electrode to the fourth electrode.

2. The light extraction structure according to claim 1, characterized in that: The set arrangement is arranged in order of increasing particle size along the direction from the first electrode to the second electrode, or the set arrangement is arranged in order of decreasing particle size along the direction from the first electrode to the second electrode, or when the cavity contains at least three different particle sizes of charged scattering particles, the set arrangement along the direction from the first electrode to the second electrode is such that the charged scattering particle with the largest particle size is located in the middle position.

3. The light extraction structure according to claim 1, characterized in that: The substrate includes a first light-transmitting layer and a second light-transmitting layer; The first surface of the first light-transmitting layer includes at least one groove, the second light-transmitting layer is bonded to the first surface of the first light-transmitting layer, and the charged scattering particles are disposed in the groove; The solution is a transparent liquid.

4. The light extraction structure according to claim 1, characterized in that: The substrate includes a transparent adhesive layer and at least one closed capsule disposed within the transparent adhesive layer, wherein the charged scattering particles are disposed within the capsule.

5. The optical extraction structure according to claim 4, characterized in that: The transparent adhesive layer includes two or more closed capsules, and the multiple capsules can share a first electrode and a second electrode; the multiple capsules are arranged vertically or horizontally along the direction from the first electrode to the second electrode.

6. A light-emitting device, characterized in that, include: The light-emitting structural layer and the light extraction structure according to any one of claims 1-5; The light extraction structure is disposed on the light-emitting side of the light-emitting structure layer, and the first electrode of the light extraction structure is parallel to the light-emitting structure layer.

7. The light-emitting device according to claim 6, characterized in that: The light-emitting structure layer includes at least one light-emitting unit group, each light-emitting unit group includes at least one light-emitting unit, and the light-emitting units included in the light-emitting unit group have the same light-emitting color; Each of the light-emitting unit groups is correspondingly disposed to a cavity in the light extraction structure; the vertical projection of the cavity in the light-emitting structure layer covers the light-emitting unit group.

8. The light-emitting device according to claim 7, characterized in that: When the light extraction structure includes a third electrode and a fourth electrode, the width of the cavity in the vertical projection of the light-emitting structure layer along the direction from the third electrode to the fourth electrode is greater than the width of the light-emitting unit group; the light-emitting unit is a white light-emitting unit, or the light-emitting unit is at least a dual-color light-emitting unit.

9. The light-emitting device according to claim 7, characterized in that: The light-emitting device further includes a driving substrate and an encapsulation layer, wherein the light-emitting structure layer is disposed between the driving substrate and the encapsulation layer; The light extraction structure is disposed on the side of the encapsulation layer away from the light-emitting structure layer, or the light extraction structure is disposed on the side of the driving substrate away from the light-emitting structure layer.

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