Flexible light-emitting device

Abstract

The invention discloses a flexible light-emitting device, which comprises a first flexible substrate, bonding layers and a first flexible light-emitting panel, and is characterized in that the first flexible light-emitting panel comprises a plurality of light-emitting elements, and the light-emitting elements are bonded on the first flexible substrate through the bonding layers which are arranged in a one-to-one correspondence manner; each light-emitting element comprises a light-emitting area and a non-light-emitting area, the area corresponding to the light-emitting area of each light-emitting element comprises at least one through hole, the through holes penetrate through the bonding layer and the first flexible substrate, or the bonding layer is arranged in the through holes to bond the first flexible light-emitting panel to the first flexible substrate; the side, away from the first flexible light-emitting panel, of the first flexible substrate is provided with a fixing structure connected with the through hole, and the first flexible substrate further comprises a plurality of air holes. According to the embodiment of the invention, the stability of the first flexible light-emitting panel bonded to the first flexible substrate can be guaranteed, the conformality of the light-emitting device can be improved, and the light-emitting device is suitable for large-scale popularization and application. Meanwhile, the ventilation of the light-emitting device can be improved through the through holes and the ventilation holes.

Description

Technical Field

[0001] The present invention relates to the field of organic light-emitting technology, and in particular to a flexible light-emitting device. Background Art

[0002] Flexible organic light-emitting diode (OLED) panels, due to their unique properties such as flexibility, thinness, stretchability, and conformability, have broad application prospects in optomedical devices and wearables. Compared to traditional displays, optomedical OLED devices have higher requirements for light uniformity, bendability, and a thin and lightweight structure.

[0003] OLED light sources, due to their softness, conformability, and bendability, have been gradually adopted in some wearable phototherapy products. However, conventional flexible OLED light panels are typically monolithic structures, which can easily lead to stress concentration during stretching, causing damage or performance degradation to the panel. This affects the overall stretchability of the light-emitting device, limiting the device to two-dimensional bending and making it difficult to adapt to the wearable requirements of photomedical products. Stretchability has become an essential requirement for wearable photomedical OLED devices. Summary of the Invention

[0004] The embodiments of the present invention provide a flexible light-emitting device with good stretchability and conformability, so that the device can better fit the curved surface of the human body and improve the phototherapy effect.

[0005] According to one aspect of the present invention, there is provided a flexible light-emitting device, comprising:

[0006] A first flexible substrate, an adhesive layer, and a first flexible light-emitting panel, wherein the first flexible light-emitting panel is adhered to one side of the first flexible substrate through the adhesive layer;

[0007] The first flexible light-emitting panel includes a plurality of light-emitting elements, each of the light-emitting elements includes a light-emitting area and a non-light-emitting area, and the adhesive layer is provided in the light-emitting area or the non-light-emitting area of ​​each light-emitting element;

[0008] The light emitting elements are not bonded to each other, and the bonding layer and the light emitting elements are arranged on the first flexible substrate in a one-to-one correspondence;

[0009] An orthographic projection area of ​​the adhesive layer on the first flexible substrate is smaller than an orthographic projection area of ​​the light-emitting region of the light-emitting element on the first flexible substrate.

[0010] Optionally, the area corresponding to the light-emitting area of ​​each light-emitting element includes at least one through hole, and the through hole passes through the adhesive layer and the first flexible substrate;

[0011] When the adhesive layer is located in the light-emitting area, the orthographic projection area of ​​the adhesive layer on the first flexible substrate is equal to 0.1-1 times the projection area of ​​the light-emitting area on the first flexible substrate.

[0012] Optionally, orthographic projection areas of the plurality of light-emitting elements on the first flexible substrate overlap with each other;

[0013] A plurality of adhesive layers of different heights are provided on one side of the first flexible substrate, and the plurality of light-emitting elements are correspondingly provided on a side of the plurality of adhesive layers away from the first flexible substrate;

[0014] Alternatively, the first flexible substrate has a plurality of concave-convex structures with different heights, and the adhesive layer and the plurality of light-emitting elements are sequentially stacked on one side of the first flexible substrate having the concave-convex structures with different heights.

[0015] Optionally, when the first flexible substrate has a plurality of concave-convex structures of different heights, the adhesive layer and the first flexible light-emitting panel are sequentially stacked and attached to a side of the first flexible substrate having the concave-convex structure;

[0016] The slope angle of the concave-convex structure of the first flexible substrate is a rounded corner, and the bending radius of the rounded corner is greater than or equal to 5 mm.

[0017] Optionally, the spacing distance between two adjacent light emitting elements is a first spacing, and the smaller the bending radius of the first flexible substrate is, the larger the first spacing is.

[0018] Optionally, a second flexible light-emitting panel is further provided on a side of the first flexible substrate away from the first flexible light-emitting panel, the second flexible light-emitting panel including a plurality of the light-emitting elements, and the light-emitting elements of the second flexible light-emitting panel 40 and the light-emitting elements on the first flexible light-emitting panel are arranged alternately on both sides of the first flexible substrate;

[0019] The projection width of the adhesive layer on the first flexible substrate for bonding the second flexible light-emitting panel on the first flexible substrate is a second spacing, and the second spacing is greater than or equal to 0.2 times the projection width of a single light-emitting element on the second flexible light-emitting panel on the first flexible substrate, and less than or equal to the first spacing.

[0020] Optionally, the first flexible light-emitting panel is bonded to the first flexible substrate via the adhesive layer provided in the through hole; a fixing structure connected to the through hole is further provided on a side of the first flexible substrate away from the first flexible light-emitting panel;

[0021] A vertical projection of the fixing structure on the first flexible substrate covers the through hole, and a ratio of an area of ​​the fixing structure to an area of ​​the through hole is less than or equal to 1.1.

[0022] Optionally, a distance between a side of the first flexible substrate close to the first flexible light-emitting panel and the first flexible light-emitting panel is a third distance;

[0023] The third spacing is 0.5 mm to 2 mm.

[0024] Optionally, the first flexible substrate further comprises a plurality of ventilation holes, and vertical projections of at least some of the ventilation holes on the first flexible substrate are located outside the through hole;

[0025] Alternatively, the first flexible substrate is made of a microporous structure material.

[0026] Optionally, the second substrate is further provided on a side of the first flexible light-emitting panel away from the first flexible substrate;

[0027] The first flexible substrate is made of stretchable materials such as transparent silicone, transparent TPU film, PDMS film, etc., and the second substrate is made of non-stretchable material, which is used to fix the first flexible light-emitting panel.

[0028] In a flexible light-emitting device provided in an embodiment of the present invention, a first flexible light-emitting panel includes a plurality of light-emitting elements, each of which is not bonded to one another. Instead, the light-emitting elements are bonded to a first flexible substrate via a corresponding adhesive layer. The plurality of light-emitting elements on the first flexible light-emitting panel that are not bonded to one another are disposed on the first flexible substrate, thereby improving the bendability and conformability of the flexible light-emitting device. In this embodiment of the present invention, each light-emitting element includes a light-emitting region and a non-light-emitting region. The region corresponding to the light-emitting region of each light-emitting element includes at least one through-hole, which extends through the adhesive layer and the first flexible substrate. This reduces light loss during light emission and improves the light extraction efficiency of the light-emitting device. An adhesive layer may be disposed within the through-hole, bonding the first flexible light-emitting panel to the first flexible substrate via the through-hole. A fixing structure connected to the through-hole is further disposed on a side of the first flexible substrate away from the first flexible light-emitting panel. The first flexible substrate also includes a plurality of ventilation holes. This embodiment ensures the stability of the first flexible light-emitting panel bonded to the first flexible substrate while making the light-emitting device thinner, thereby improving the conformability of the light-emitting device. Furthermore, the through-holes and ventilation holes enhance ventilation and air permeability of the light-emitting device.

[0029] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 Schematic diagram of a flexible light-emitting device provided by an embodiment of the present invention.

[0032] Figure 2 is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention.

[0033] Figure 3 is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention.

[0034] Figure 4 is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention.

[0035] Figure 5 is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention.

[0036] Figure 6 is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention.

[0037] Figure 7 is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention.

[0038] Figure 8 is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention.

[0039] Figure 9 is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention.

[0040] Figure 10 yes Figure 9 A top view of the light-emitting device.

[0041] Figure 11 yes Figure 9 A top view of another light emitting device.

[0042] Figure 12 is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] An embodiment of the present invention provides a flexible light-emitting device. Figure 1 is a schematic diagram of a flexible light-emitting device provided by an embodiment of the present invention, Figure 2 Schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention. Figure 1-Figure 2 , the flexible light-emitting device comprises:

[0046] A first flexible substrate 10, an adhesive layer 20 and a first flexible light-emitting panel 30, wherein the first flexible light-emitting panel 30 is adhered to one side of the first flexible substrate 10 through the adhesive layer 20;

[0047] The first flexible light-emitting panel 30 includes a plurality of light-emitting elements 31 , each light-emitting element 31 includes a light-emitting area and a non-light-emitting area, and the adhesive layer 20 is disposed in the light-emitting area or the non-light-emitting area of ​​each light-emitting element 31 ;

[0048] Each light emitting element 31 is not bonded to each other, and the bonding layer 20 and the light emitting element 31 are arranged on the first flexible substrate 10 in a one-to-one correspondence;

[0049] The orthographic projection area of ​​the adhesive layer 20 on the first flexible substrate 10 is smaller than the orthographic projection area of ​​the light emitting region of the light emitting element 31 on the first flexible substrate.

[0050] The first flexible substrate 10 is a stretchable substrate that can deform under the action of force. It can be made of stretchable materials such as transparent silicone, transparent thermoplastic polyurethane (TPU) film, or polydimethylsiloxane (PDMS) film. The adhesive layer 20 can be made of room-temperature curable transparent adhesives such as silicone glue or transparent epoxy resin glue, or transparent adhesives such as OCA glue or acrylic pressure-sensitive adhesive. The transparency of the first flexible substrate 10 and the adhesive layer 20 facilitates light emission from the side of the first flexible substrate 10. The deformable and biocompatible material of the first flexible substrate 10 makes it suitable for wearable optical medical devices in applications such as elbow and knee joints.

[0051] The first flexible light-emitting panel 30 includes multiple light-emitting elements 31. Each light-emitting element 31 includes a light-emitting area and a non-light-emitting area. The areas between the multiple light-emitting elements 31 and the borders of the light-emitting elements 31 are non-light-emitting areas. The adhesive layer 20 is provided in the light-emitting area or the non-light-emitting area of ​​each light-emitting element 31. This ensures that the light-emitting element 31 has a normal light-emitting area and firmly adheres to the first flexible substrate 10. At the same time, the non-light-emitting area can maintain a certain degree of freedom, which promotes the stretchability of the overall light-emitting device structure.

[0052] Specifically, each light-emitting element 31 is not bonded to each other, but is bonded to the transparent first flexible substrate 10 via a transparent adhesive layer 20. This allows the flexible light-emitting panel 30 to emit light from the direction of the first flexible substrate 10, and each light-emitting element 31 can move independently, enhancing the stretchability of the entire light-emitting device. When used in a phototherapy device, it is convenient to bend from the direction of the first flexible substrate 10 for conformal treatment. The adhesive layer 20 and the light-emitting element 31 are arranged in a one-to-one correspondence on the first flexible substrate 10, which can make the light-emitting element 31 more firmly bonded to the first flexible substrate 10 and prevent damage and detachment of the light-emitting element 31 during deformation. The orthographic projection area of ​​the adhesive layer 20 on the first flexible substrate 10 is smaller than the orthographic projection area of ​​the light-emitting area of ​​the light-emitting element 31 on the first flexible substrate 10, which can further ensure the normal light-emitting area of ​​the light-emitting element and improve the light-emitting efficiency.

[0053] Based on the above embodiment, optionally, refer to Figure 2 , the area corresponding to the light emitting area of ​​each light emitting element 31 includes at least one through hole 32 , and the through hole 32 passes through the adhesive layer 20 and the first flexible substrate 10 ;

[0054] When the adhesive layer 20 is located in the light emitting area, the orthographic projection area of ​​the adhesive layer 20 on the first flexible substrate 10 is equal to 0.1-1 times the projection area of ​​the light emitting area on the first flexible substrate 10 .

[0055] The area corresponding to the light-emitting region of each light-emitting element 31 includes at least one through-hole 32 that penetrates the adhesive layer 20 and the first flexible substrate 10. The light emitted by the light-emitting element 31 can be directly emitted through the through-hole 32, thereby reducing light loss during light emission and improving the light extraction efficiency of the light-emitting device. When the area corresponding to the light-emitting region of each light-emitting element 31 includes a through-hole 32, one, two, or more through-holes 32 can be provided. The cross-sectional area of ​​the through-hole 32 is smaller than the area of ​​the area corresponding to the light-emitting region. Specifically, the size and number of the through-holes 32 can be set according to the area of ​​the area corresponding to the light-emitting region. If the cross-sectional area of ​​the through-holes 32 is too large or the number of the through-holes 32 is too large, the projected area of ​​the adhesive layer 20 on the first flexible substrate 10 may be too small, affecting the stability of the light-emitting element 31 on the first flexible substrate 10 and affecting the overall stretchability of the light-emitting device.

[0056] In addition, by setting the adhesive layer 20 in the light-emitting area, the positive projection area of ​​the adhesive layer 20 on the first flexible substrate 10 is equal to 0.1-1 times the projection area of ​​the light-emitting area on the first flexible substrate 10. This design allows most areas of the first flexible light-emitting panel 30 to move freely when stretched, and only a small area is fixed to the first flexible substrate 10 by the adhesive layer 20, thereby improving the stretchability of the overall structure, further improving the bendability of the light-emitting device, and ensuring that the flexible light-emitting device has a long service life.

[0057] Figure 3 is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention. Figure 4 is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention, Figure 5 is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention, Figure 6 This is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention. Based on the above embodiment, optionally, refer to Figure 3-Figure 6 , the orthographic projection areas of the plurality of light-emitting elements 31 on the first flexible substrate 10 overlap with each other; a plurality of adhesive layers 20 of different heights are provided on one side of the first flexible substrate 10, and the plurality of light-emitting elements 31 are correspondingly provided on a side of the plurality of adhesive layers 20 away from the first flexible substrate 10;

[0058] During the stretching process, the spacing between the multiple light-emitting elements 31 of the light-emitting device increases, resulting in an increase in the area of ​​the non-luminous region, which affects the light-emitting device's light-emitting efficiency. By overlapping the orthographic projection areas of the multiple light-emitting elements 31 on the first flexible substrate 10, adjacent light-emitting elements 31 can overlap each other when the first flexible substrate 10 is stretched, thereby increasing the area of ​​the light-emitting region of the entire first flexible light-emitting panel 30 and improving the light-emitting efficiency of the entire light-emitting device. For example, the width of the overlapping light-emitting region between adjacent light-emitting elements 31 is greater than or equal to the amount of stretching of the first flexible substrate 10, further ensuring that the first flexible light-emitting panel 30 does not display gaps even when stretched, thereby ensuring the continuity of the display effect.

[0059] refer to Figure 3 By disposing multiple adhesive layers 20 of varying heights on the non-light-emitting side of the first flexible substrate 10, and disposing the multiple light-emitting elements 31 on the side of the adhesive layers 20 away from the first flexible substrate 10, the light-emitting elements 31 can be securely bonded to the first flexible substrate 10. This simple arrangement of the adhesive layers 20 at varying heights allows the multiple light-emitting elements 31 to be stacked at varying heights, overlapping their orthographic projections on the first flexible substrate 10. This increases the area of ​​the light-emitting region and, in turn, improves the light-extraction efficiency of the light-emitting device. Specifically, the height difference of the adhesive layers 20 ranges from 0.2 to 0.8 mm, forming a wavy, concave-convex adhesive layer.

[0060] Based on the above embodiment, optionally, refer to Figure 4-Figure 5 Alternatively, the first flexible substrate 10 may be configured with a plurality of concave-convex structures of varying heights, and the adhesive layer 20 and the plurality of light-emitting elements 31 may be sequentially stacked on one side of the first flexible substrate 10 having the concave-convex structures of varying heights, thereby achieving overlapping orthographic projections of the light-emitting elements 31 on the first flexible substrate 10. Specifically, the height difference of the concave-convex structures of the first flexible substrate 10 is 0.2-0.8 mm, forming a wavy concave-convex substrate. The adhesive layer 20 has the same height, allowing the plurality of light-emitting elements 31 to be stacked at different heights. This also increases the area of ​​the light-emitting region, thereby improving the light extraction efficiency of the light-emitting device.

[0061] When the first flexible substrate 10 has a plurality of concave-convex structures with different heights, refer to Figure 6 The adhesive layer 20 and the first flexible light-emitting panel 30 are sequentially stacked and attached to the side of the first flexible substrate 10 having the concave-convex structure. Specifically, the concave-convex structure of the first flexible substrate 10 has a rounded corner with a radius of 5 mm or greater. This design allows the first flexible light-emitting panel 30 to be smoothly attached to the concave-convex structure, avoiding stress concentration caused by sharp corners and extending the service life of the light-emitting device.

[0062] Figure 7 is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention, Figure 8 This is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention. Based on the above embodiment, optionally, refer to Figure 7-Figure 8 The spacing distance between two adjacent light emitting elements 31 is a first spacing L1. The smaller the bending radius of the first flexible substrate 10 is, the larger the first spacing L1 is.

[0063] Specifically, when the bending radius of the first flexible substrate 10 is 8 mm, the first spacing is 3 mm; when the bending radius of the first flexible substrate 10 is 4 mm, the first spacing is 6 mm. This design allows the first flexible light-emitting panel 30 to emit light from the side away from the first flexible substrate 10. Furthermore, the light-emitting device has good flexibility and adaptability, making it more suitable for use in phototherapy devices.

[0064] A second flexible light-emitting panel 40 is further provided on a side of the first flexible substrate 10 away from the first flexible light-emitting panel 30. The second flexible light-emitting panel 40 includes a plurality of light-emitting elements 31. The light-emitting elements 31 on the second flexible light-emitting panel 40 are arranged alternately with the light-emitting elements 31 on the first flexible light-emitting panel 30 on both sides of the first flexible substrate 10. The plurality of light-emitting elements 31 on the second flexible light-emitting panel 40 are bonded to an area projected onto the first flexible substrate 10 at a first spacing L1 by an adhesive layer 20.

[0065] The projected width of the adhesive layer 20 on the first flexible substrate 10 for bonding the second flexible light-emitting panel 40 on the first flexible substrate 10 is a second spacing L2. The second spacing L2 is greater than or equal to 0.2 times the projected width of a single light-emitting element 31 on the second flexible light-emitting panel 40 on the first flexible substrate 10, and less than or equal to the first spacing L1.

[0066] Specifically, refer to Figure 8 A second flexible light-emitting panel 40 is provided on a side of the first flexible substrate 10 away from the first flexible light-emitting panel 30. The second flexible light-emitting panel 40 includes a plurality of light-emitting elements 31. The light-emitting elements 31 on the second flexible light-emitting panel 40 are arranged alternately with the light-emitting elements 31 on the first flexible light-emitting panel 30 on either side of the first flexible substrate 10. The plurality of light-emitting elements 31 on the second flexible light-emitting panel 40 are bonded to the area projected onto the first flexible substrate 10 at a first spacing L1 via an adhesive layer 20. This staggered arrangement of the light-emitting elements 31 on either side of the first flexible substrate 10 not only allows the projected areas of the light-emitting elements 31 on both sides of the first flexible substrate 10 to overlap, thereby increasing the light-emitting area and improving the light extraction efficiency of the light-emitting device, but also enables the light-emitting device to achieve dual-sided illumination.

[0067] Specifically, the projected width of the adhesive layer 20 on the first flexible substrate 10 for bonding the second flexible light-emitting panel 40 is a second spacing L2. The second spacing L2 is greater than or equal to 0.2 times the projected width of a single light-emitting element 31 on the second flexible light-emitting panel 40 on the first flexible substrate 10, and less than or equal to the first spacing L1. The design of the second spacing L2 being greater than or equal to 0.2 times the projected width of a single light-emitting element 31 on the second flexible light-emitting panel 40 on the first flexible substrate 10 ensures that the light-emitting elements 31 on the second flexible light-emitting panel 40 are securely bonded to the first flexible substrate 10. At the same time, the second spacing L2 being less than the first spacing L1 ensures that an excessive number of adhesive layers 20 are not required, which would affect the flexibility and adaptability of the light-emitting device. This makes the light-emitting device more suitable for phototherapy devices that require higher flexibility and conformability.

[0068] Figure 9 is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention, Figure 10 yes Figure 9 A top view of the light emitting device, Figure 11 yes Figure 9 In another top view of the light emitting device, based on the above embodiment, optionally, refer to Figures 9-11 The first flexible light-emitting panel 30 is bonded to the first flexible substrate 10 through the adhesive layer 20 provided in the through hole 32 . A fixing structure 33 connected to the through hole 32 is further provided on the side of the first flexible substrate 10 away from the first flexible light-emitting panel 30 .

[0069] The first flexible light-emitting panel 30 is bonded to the first flexible substrate 10 via the adhesive layer 20 disposed in the through-hole 32. The adhesive layer 20 may partially or completely fill the through-hole 32. Furthermore, the adhesive layer 20 may be disposed in the region where the fixing structure 33 contacts the first flexible substrate 10 to further enhance the stability of the fixing structure 33. The design of the adhesive layer 20 disposed in the through-hole 32 not only ensures the stability of the first flexible light-emitting panel 30 bonded to the first flexible substrate 10, but also makes the light-emitting device thinner, thereby improving the conformability of the light-emitting device.

[0070] Specifically, a fixing structure 33 connected to the through hole 32 is provided on a side of the first flexible substrate 10 away from the first flexible light-emitting panel 30. The vertical projection of the fixing structure 33 on the first flexible substrate 10 covers the through hole 32, and the ratio of the area of ​​the fixing structure 33 to the area of ​​the through hole 32 is less than or equal to 1.1. This arrangement ensures the stability of the first flexible light-emitting panel 30 on the first flexible substrate 10 while ensuring that the fixing structure 33 does not occupy too much area of ​​the light-emitting area of ​​the light-emitting element 31, thereby improving the light extraction efficiency of the light-emitting device.

[0071] refer to Figure 9 The distance between the first flexible substrate 10 and the first flexible light-emitting panel 30 is a third distance L3, and the third distance L3 is 0.5 mm to 2 mm. This design ensures a certain distance between the first flexible light-emitting panel 30 and the first flexible substrate 10, even without the isolation of the adhesive layer 20. This provides ventilation and heat dissipation for the first flexible light-emitting panel 30, thereby improving the heat dissipation capacity of the light-emitting device.

[0072] refer to Figure 10-11 The top view of the fixing structure 33 on the first flexible substrate 10 can be an integral fixing base or a Figure 11 This array of fixed bases with a certain gap between them not only provides stability, but also provides ventilation and heat dissipation, and can also improve the stretchability of the light-emitting device. Specifically, the number of bases corresponding to one through hole 32 can be 2, 4, 6, etc., and this number is not specifically limited here.

[0073] Figure 12 This is a schematic diagram of another flexible light-emitting device provided by an embodiment of the present invention. Based on the above embodiment, optionally, refer to Figure 12 The first flexible substrate 10 further includes a plurality of ventilation holes 34, at least some of which are vertically projected on the first flexible substrate 10 outside the through hole 32. This arrangement can ensure that the light-emitting device has good ventilation and heat dissipation, while the area corresponding to the ventilation holes 34 is equivalent to having no medium, thereby increasing the light output rate of the light-emitting device.

[0074] Alternatively, the first flexible substrate 10 may be made of a material having a microporous structure to ensure ventilation and heat dissipation of the light-emitting device.

[0075] On the basis of the above embodiment, optionally, a second substrate 50 is further provided on a side of the first flexible light-emitting panel 30 away from the first flexible substrate 10 ;

[0076] The first flexible substrate 10 is made of a stretchable material such as transparent silicone, transparent TPU film, or PDMS film, and the second substrate 50 is made of a non-stretchable material, and is used to fix the first flexible light-emitting panel 30 .

[0077] In an embodiment of the present invention, the multiple light-emitting elements of the first flexible light-emitting panel in the flexible light-emitting device are not bonded to each other, and the light-emitting elements are bonded to the first flexible substrate via adhesive layers arranged in a one-to-one correspondence, thereby improving the bendability and conformability of the flexible light-emitting device. By including at least one through-hole in the area corresponding to the light-emitting area of ​​each light-emitting element, and the through-hole penetrating the adhesive layer and the first flexible substrate, light loss during light emission can be reduced, thereby improving the light extraction efficiency of the light-emitting device. Alternatively, the first flexible light-emitting panel can be bonded to the first flexible substrate by providing an adhesive layer within the through-hole, and a fixing structure connected to the through-hole is provided on the side of the first flexible substrate away from the first flexible light-emitting panel. The first flexible substrate also includes a plurality of ventilation holes, which can not only ensure the stability of the first flexible light-emitting panel bonded to the first flexible substrate, but also make the light-emitting device thinner, thereby improving the conformability of the light-emitting device. At the same time, the ventilation and air permeability of the light-emitting device can be improved through the through-holes and the ventilation holes.

[0078] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0079] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A flexible light-emitting device, characterized in that: include: A first flexible substrate, an adhesive layer, and a first flexible light-emitting panel, wherein the first flexible light-emitting panel is adhered to one side of the first flexible substrate through the adhesive layer; The first flexible light-emitting panel includes a plurality of light-emitting elements, each of the light-emitting elements includes a light-emitting area and a non-light-emitting area, and the adhesive layer is provided in the light-emitting area or the non-light-emitting area of ​​each light-emitting element; The light emitting elements are not bonded to each other, and the bonding layer and the light emitting elements are arranged on the first flexible substrate in a one-to-one correspondence; An orthographic projection area of ​​the adhesive layer on the first flexible substrate is smaller than an orthographic projection area of ​​the light-emitting region of the light-emitting element on the first flexible substrate.

2. The flexible light-emitting device according to claim 1, characterized in that: The area corresponding to the light-emitting area of ​​each light-emitting element includes at least one through hole, and the through hole passes through the adhesive layer and the first flexible substrate; When the adhesive layer is located in the light-emitting area, the orthographic projection area of ​​the adhesive layer on the first flexible substrate is equal to 0.1-1 times the projection area of ​​the light-emitting area on the first flexible substrate.

3. The flexible light-emitting device according to claim 1, wherein: The orthographic projection areas of the plurality of light emitting elements on the first flexible substrate overlap with each other; A plurality of adhesive layers of different heights are provided on one side of the first flexible substrate, and the plurality of light-emitting elements are correspondingly provided on a side of the plurality of adhesive layers away from the first flexible substrate; Alternatively, the first flexible substrate has a plurality of concave-convex structures with different heights, and the adhesive layer and the plurality of light-emitting elements are sequentially stacked on one side of the first flexible substrate having the concave-convex structures with different heights.

4. The flexible light-emitting device according to claim 3, characterized in that: When the first flexible substrate has a plurality of concave-convex structures of different heights, the adhesive layer and the first flexible light-emitting panel are sequentially stacked and attached to the side of the first flexible substrate having the concave-convex structure; The slope angle of the concave-convex structure of the first flexible substrate is a rounded corner, and the bending radius of the rounded corner is greater than or equal to 5 mm.

5. The flexible light-emitting device according to claim 1, characterized in that: The spacing distance between two adjacent light emitting elements is a first spacing, and the smaller the bending radius of the first flexible substrate is, the larger the first spacing is.

6. The flexible light-emitting device according to claim 5, characterized in that: A second flexible light-emitting panel is further provided on a side of the first flexible substrate away from the first flexible light-emitting panel. The second flexible light-emitting panel includes a plurality of light-emitting elements. The light-emitting elements of the second flexible light-emitting panel 40 and the light-emitting elements of the first flexible light-emitting panel are arranged alternately on both sides of the first flexible substrate. The projection width of the adhesive layer on the first flexible substrate for bonding the second flexible light-emitting panel on the first flexible substrate is a second spacing, and the second spacing is greater than or equal to 0.2 times the projection width of a single light-emitting element on the second flexible light-emitting panel on the first flexible substrate, and less than or equal to the first spacing.

7. The flexible light-emitting device according to claim 3, characterized in that: The first flexible light-emitting panel is bonded to the first flexible substrate via the adhesive layer provided in the through hole; a fixing structure connected to the through hole is further provided on a side of the first flexible substrate away from the first flexible light-emitting panel; A vertical projection of the fixing structure on the first flexible substrate covers the through hole, and a ratio of an area of ​​the fixing structure to an area of ​​the through hole is less than or equal to 1.

1.

8. The flexible light-emitting device according to claim 7, characterized in that: A distance between a side of the first flexible substrate close to the first flexible light-emitting panel and the first flexible light-emitting panel is a third distance; The third spacing is 0.5 mm to 2 mm.

9. The flexible light-emitting device according to claim 3, characterized in that: The first flexible substrate further comprises a plurality of ventilation holes, and at least some of the ventilation holes are located outside the through hole in a vertical projection on the first flexible substrate; Alternatively, the first flexible substrate is made of a microporous structure material.

10. The flexible light-emitting device according to claim 1, characterized in that: The second substrate is further provided on a side of the first flexible light-emitting panel away from the first flexible substrate; The first flexible substrate is made of stretchable materials such as transparent silicone, transparent TPU film, PDMS film, etc., and the second substrate is made of non-stretchable material, which is used to fix the first flexible light-emitting panel.

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