Phototherapy band-aid

Abstract

Disclosed is a phototherapy adhesive plaster. The phototherapy adhesive plaster comprises a phototherapy unit, which comprises a shell, at least one OLED light-emitting panel, and a driving device, the at least one OLED light-emitting panel and the driving device being arranged on the shell, the at least one OLED light-emitting panel emitting light with a wavelength of 400-1400 nm, wherein the phototherapy unit has a light cavity enclosed by the shell, all the inner surfaces of the light cavity except the bottom surface of the light cavity towards the side of the fixing structure are arranged with the OLED light-emitting panel, and the proportion of the light-emitting area of the OLED light-emitting panel to the total area of the inner surface of the light cavity is not less than 50%, and the light transmittance of the projection part of the phototherapy unit on the fixing structure is not less than 20%. This structure can fully collect and utilize the light emitted by the light-emitting panel in all directions, effectively improve the light utilization rate, and at the same time, can avoid the adhesion of the phototherapy adhesive plaster to the wound surface, and meet the demand of the air-permeable treatment of the wound surface.

Description

Technical Field

[0001] This invention relates to a phototherapy bandage. More specifically, it relates to a phototherapy bandage having a phototherapy unit and a fixation structure. Background Technology

[0002] In the mid-to-late 20th century, technologies such as Low Light Laser Treatment and Photobiomodulation (PMB) emerged, both of which utilize light as a means of treating diseases in the medical field (Michael R. Hamblin, Ying-ying Huang, Handbook of Photomedicine, CRC Press). Recent studies have shown that red to near-infrared light irradiation helps promote the regeneration of collagen and skin cells, and can be applied in areas such as anti-wrinkle cosmetics, promoting wound healing, and removing blemishes and scars (Chan Hee Nam et al., Dermatologic Surgery, 2017, 43:371-380; Daniel Barolet, Semin Cutan Med Surg, 2008, 27:227-238; Yongmin Jeon, Adv. Mater. Technol. 2018, 1700391). With the rapid development of micro-light therapy and photobiological regulation technology, more and more phototherapy products have emerged, especially wearable phototherapy products such as phototherapy masks, phototherapy hair growth caps, phototherapy shaping garments, and eye phototherapy devices, which have become ideal home beauty, body shaping, or health care products for more and more people.

[0003] The light sources used in phototherapy products can emit light with peak wavelengths between 400-1400 nm, preferably red and near-infrared light with peak wavelengths between 600-970 nm. Light in this wavelength range has anti-wrinkle, skin regeneration, spot removal, and even anti-inflammatory effects (such as for styes and acne), as well as wound healing and scar fading effects (Daniel Barolet, Semin Cutan Med Surg, 27:227-238, 2008). Light sources in phototherapy products can also emit blue light at 400-500 nm. This wavelength has antibacterial, anti-inflammatory, and wound infection-reducing effects, and can effectively treat acne, for example. In some phototherapy products with multiple therapeutic effects, multiple different wavelengths of light are generally used simultaneously. Most such phototherapy products on the market currently use LEDs that emit different colors of light as the light source. LEDs are high-intensity point light sources and usually generate heat. Therefore, LED light sources generally integrate heat dissipation devices to remove heat, and these LEDs must be arranged at a certain distance when used in arrays for heat dissipation. This results in LED phototherapy products having disadvantages such as being relatively thick and heavy, having uneven light emission, and being difficult to assemble and repair.

[0004] As a surface light source, a cold light source, OLED is not glaring and has the characteristics of being thin and light, making it very easy to integrate onto flexible substrates. It has become an ideal light source choice in the field of phototherapy devices. Therefore, phototherapy products that use OLED as a light source have broad market prospects and have attracted widespread attention.

[0005] Patent application CN215273858U discloses a tetrahedral adhesive bandage that avoids adhesion between the wound and the pad, but this application does not use any photoelectric device. Patent application CN223516546U discloses a phototherapy adhesive bandage that incorporates light-emitting diodes (LEDs) in the dressing layer and has hollowed-out designs in the corresponding dressing and drug delivery layers to allow light to pass through. However, the LEDs in this application are only located directly above the wound, parallel to the dressing layer (i.e., the wound surface), and do not form continuous light throughout the cavity. Patent application US10384076B2 discloses a phototherapy adhesive bandage that, although it also constructs cavities around each light-emitting device, the light-emitting unit is a single point, not a surface light source surrounded by four sides. Furthermore, it focuses on using the "residual heat of the light source" as a usable resource, conducting heat to the treatment area through a thermal management system to eliminate uneven heating and cooling of the skin contact surface. Similarly, patent application US20050177093A1 simply creates holes on the surface of the bandage corresponding to the LED light source, allowing light to shine onto the skin. Because these applications use point light sources like LEDs, they cannot construct a light cavity. Furthermore, LEDs typically emit Lambertian light, which results in the loss of light emitted at large angles, making them unsuitable for phototherapy.

[0006] The applicant's previous application CN112754764A disclosed a phototherapy bandage, in which the phototherapy unit uses an OLED light-emitting panel. However, the light-emitting panel is parallel to the area to be treated. Although there may be an absorbent layer, a protective film, etc. between the light source panel and the skin, they are all in contact with the light-emitting panel. The light-emitting panel itself does not constitute a cavity structure.

[0007] In summary, current commercially available and patented phototherapy bandages have several structural defects and cannot meet the actual needs of phototherapy for wound healing. In order to accelerate wound healing with phototherapy while avoiding direct contact between the light-emitting unit and the wound, or for skin diseases such as acne that protrude on the skin surface and require breathability during treatment, a phototherapy bandage that can emit light around the wound, has sufficient light energy utilization, and does not directly contact the wound is urgently needed for development. Summary of the Invention

[0008] The present invention aims to provide a novel phototherapy bandage to at least solve some of the problems mentioned above in the prior art.

[0009] According to one embodiment of the present invention, a phototherapy bandage is disclosed, comprising a phototherapy unit and a fixing structure; the phototherapy unit is disposed on one side of the fixing structure;

[0010] The phototherapy unit includes a housing, at least one OLED light-emitting panel, and a driving device. The at least one OLED light-emitting panel and the driving device are disposed on the housing, and the driving device is electrically connected to the at least one OLED light-emitting panel.

[0011] The at least one OLED light-emitting panel emits light with a wavelength of 400-1400 nm;

[0012] The housing encloses and forms a light cavity; except for the bottom surface of the light cavity facing the fixed structure, the remaining inner surfaces of the light cavity are provided with OLED light-emitting panels, and the light-emitting area of ​​the OLED light-emitting panels accounts for no less than 50% of the total area of ​​the inner surface of the light cavity;

[0013] The light transmittance of the projection portion of the fixed structure corresponding to the phototherapy unit is not less than 20%.

[0014] According to one embodiment of the present invention, the housing encloses a semi-enclosed optical cavity.

[0015] According to one embodiment of the invention, the housing is flexible.

[0016] According to one embodiment of the invention, the top of the housing is smooth.

[0017] According to one embodiment of the present invention, the OLED light-emitting panel is flexible.

[0018] According to one embodiment of the present invention, the phototherapy unit includes at least two OLED light-emitting panels, each OLED light-emitting panel being fan-shaped.

[0019] According to one embodiment of the present invention, the irradiance of the bottom surface of the optical cavity is not less than 1 mW / cm². 2 Not higher than 50mW / cm 2 .

[0020] According to one embodiment of the present invention, the irradiance of the bottom surface of the optical cavity is not less than 3 mW / cm². 2 Not higher than 10mW / cm 2 .

[0021] According to one embodiment of the present invention, the height of the phototherapy unit is no greater than 2 cm.

[0022] According to one embodiment of the present invention, the height of the phototherapy unit is no greater than 1.5 cm.

[0023] According to one embodiment of the present invention, the height of the phototherapy unit is no greater than 1 cm.

[0024] According to one embodiment of the present invention, the height of the phototherapy unit is no greater than 0.5 cm.

[0025] According to one embodiment of the present invention, the height of the optical cavity is no greater than 2 cm.

[0026] According to one embodiment of the present invention, the height of the optical cavity is no greater than 1.5 cm.

[0027] According to one embodiment of the present invention, the height of the optical cavity is no greater than 1 cm.

[0028] According to one embodiment of the present invention, the height of the optical cavity is no greater than 0.5 cm.

[0029] According to one embodiment of the present invention, the portion of the fixed structure corresponding to the projection of the phototherapy unit is hollowed out; or it includes a wound protection layer.

[0030] According to one embodiment of the present invention, the optical cavity is of a regular shape.

[0031] According to one embodiment of the present invention, the optical cavity is pyramidal, frustum-shaped, conical, or dome-shaped.

[0032] According to one embodiment of the present invention, the optical cavity is triangular pyramidal, quadrangular pyramidal, or conical.

[0033] According to one embodiment of the present invention, each OLED light-emitting panel is triangular in shape.

[0034] According to one embodiment of the present invention, the top of the housing enclosing the optical cavity is flat.

[0035] According to one embodiment of the present invention, the phototherapy unit includes at least three or at least four OLED light-emitting panels, each OLED light-emitting panel being triangular or triangular in shape.

[0036] According to one embodiment of the present invention, the at least one OLED light-emitting panel can emit light with a wavelength of 600-1400nm.

[0037] According to one embodiment of the present invention, the at least one OLED light-emitting panel can emit light of two colors with wavelengths of 400-500 nm and 600-1400 nm.

[0038] According to one embodiment of the present invention, the emitting surface of the at least one OLED emitting panel further includes a scattering film.

[0039] According to one embodiment of the present invention, the OLED light-emitting panels are provided with gaps between each other, and the housing is provided with openings at positions corresponding to the gaps.

[0040] According to one embodiment of the present invention, the OLED light-emitting panels are provided with gaps between each other, and the housing is provided with a scattering film at a position corresponding to the gaps.

[0041] According to one embodiment of the present invention, the luminous area of ​​the OLED light-emitting panel accounts for no less than 80% of the total surface area of ​​the light cavity.

[0042] According to one embodiment of the present invention, the luminous area of ​​the OLED light-emitting panel accounts for no less than 90% of the total surface area of ​​the inner surface of the light cavity.

[0043] According to one embodiment of the present invention, the housing and the OLED light-emitting panel in the phototherapy unit are detachable.

[0044] According to one embodiment of the present invention, the fixing structure has a connecting structure on the side near the phototherapy unit.

[0045] According to one embodiment of the present invention, the phototherapy unit is disposed on one side of the fixed structure via a detachable structure.

[0046] According to one embodiment of the present invention, the detachable structure is selected from Velcro, snaps, magnets, and adhesives.

[0047] According to one embodiment of the present invention, the fixing structure can fix the phototherapy bandage to the user's skin.

[0048] According to one embodiment of the present invention, the fixing structure is provided with a connection structure on the side away from the phototherapy unit to adhere the phototherapy bandage to the user's skin.

[0049] According to one embodiment of the present invention, the connection structure is selected from Velcro, snap fasteners, magnets, and adhesives.

[0050] According to one embodiment of the present invention, the size of the optical cavity is adjustable.

[0051] According to one embodiment of the present invention, the OLED panel and the housing are flexible, and the size of the light cavity is adjusted by changing the enclosure shape of the OLED panel and the housing.

[0052] According to one embodiment of the present invention, the OLED panel and housing are adjusted to adjust the size of the optical cavity by rolling, stretching and shaping.

[0053] The phototherapy bandage disclosed in this invention includes a phototherapy unit and a fixing structure. The phototherapy unit is disposed on one side of the fixing structure. The phototherapy unit includes a housing, at least one OLED light-emitting panel, and a driving device. The at least one OLED light-emitting panel and the driving device are disposed on the housing. The at least one OLED light-emitting panel emits light with a wavelength of 400-1400nm. The phototherapy unit has a light cavity formed by the housing. Except for the bottom surface of the light cavity facing the fixing structure, all other inner surfaces of the light cavity are arranged with OLED light-emitting panels. The light-emitting area of ​​the OLED light-emitting panel accounts for no less than 50% of the total area of ​​the inner surface of the light cavity. The light transmittance of the portion of the fixing structure corresponding to the projection of the phototherapy unit is no less than 20%. This structure can fully collect and utilize the light emitted from the light-emitting panel in all directions, effectively improving the light utilization rate. At the same time, it can prevent the phototherapy bandage from adhering to the wound, meeting the needs of breathable wound treatment. In addition, such a phototherapy unit can also have its own driving device, making the phototherapy unit an independent, detachable component that can be reused, making it more economical and environmentally friendly. Attached Figure Description

[0054] Figures 1a-1d This is a schematic diagram of a single-layer OLED device structure.

[0055] Figure 2 This is a schematic diagram of a stacked OLED device structure.

[0056] Figures 3a-3d This is a cross-sectional schematic diagram of an OLED light-emitting panel.

[0057] Figures 4a-4b This is a schematic diagram and exploded view of the structure of a phototherapy bandage.

[0058] Figures 5a-5c This is a schematic diagram of the structure of an OLED light-emitting panel.

[0059] Figures 6a-6b This is a structural diagram and exploded view of another type of phototherapy bandage.

[0060] Figures 7a-7b 7d is a structural diagram and exploded view of another type of phototherapy bandage.

[0061] Figure 7c This is a two-dimensional planar view of the unfolded OLED 7011 light-emitting panel.

[0062] Figures 8a-8b This is a structural diagram and exploded view of another type of phototherapy bandage.

[0063] Figures 9a-9b This is a structural diagram and exploded view of another type of phototherapy bandage.

[0064] Figure 10 This is a schematic diagram of the structure of a flat-top phototherapy bandage.

[0065] Figure 11 This is a schematic diagram of the structure of a dome-shaped phototherapy bandage.

[0066] Figure 12a This is a schematic diagram of the device layout for a comparative example.

[0067] Figure 12b This is a schematic diagram of the device being lit up in a comparative example.

[0068] Figure 12c This is a schematic diagram of the device being lit up in Example 1. Detailed Implementation

[0069] As used herein, "top" means furthest from the substrate, and "bottom" means closest to the substrate. When the first layer is described as being "disposed" on the second layer, the first layer is positioned further from the substrate. Conversely, when the first layer is described as being "disposed" on the second layer, the first layer is positioned closer to the substrate. Unless it is specified that the first layer "contacts" the second layer, other layers may exist between the first and second layers. For example, even if various organic layers exist between the cathode and anode, the cathode can still be described as being "disposed" on the anode.

[0070] As used herein, the term "OLED device" includes an anode (layer), a cathode (layer), and one or more organic layers disposed between the anode (layer) and the cathode (layer). An "OLED device" can be bottom-emitting (bottom-emitting), i.e., emitting light from the anode side, or top-emitting (top-emitting), i.e., emitting light from the cathode side, or a transparent device that emits light from both the anode and cathode. In this document, the anode (layer) and cathode (layer) of the same "OLED device" are not on the same plane.

[0071] As used herein, the term "OLED light-emitting panel" includes a substrate, an anode (layer), a cathode (layer), one or more organic layers disposed between the anode (layer) and the cathode (layer), an encapsulation layer, and at least one anode contact and at least one cathode contact extending outside the encapsulation layer for external access.

[0072] As used herein, the term "encapsulation layer" can refer to a thin-film encapsulation with a thickness of less than 100 micrometers, which includes one or more thin films directly deposited onto the device, or it can refer to a cover glass adhered to a substrate.

[0073] As used herein, the term "light extraction layer" can refer to a light diffusion film, or other microstructures with light extraction effects, or a thin-film coating with light external coupling effects. The light extraction layer can be disposed on the surface of the OLED substrate, or in other suitable locations, such as between the substrate and the anode, between the organic layer and the cathode, between the cathode and the encapsulation layer, or on the surface of the encapsulation layer, etc. As used herein, the terms "light extraction element" and "light extraction layer" refer to an element specifically designed to extract edge light from the emitting panel and direct at least a portion of the emitted light away from the original emitting surface.

[0074] A "light extraction element" can be a film layer with light extraction function, but this film layer is not coated on the surface of the OLED light-emitting surface, but rather on the edge of the OLED light-emitting surface. The light extraction element may also include a portion of a substrate and / or housing, for example, scattering particles may be doped in portions of the substrate and / or housing near or at the edge of the OLED. The light extraction element may also include a reflective layer, typically disposed on the same side of the light extraction element as the original light-emitting surface and / or on the side of the housing.

[0075] As used herein, the term "independently driven" refers to two or more OLED devices whose operating points are controlled separately. Although these OLED devices may be connected to the same controller or power line, there can be circuitry to divide the drive paths and power each OLED device without affecting each other. "Independently driven" electrodes mean that the electrodes can be supplied with a voltage or current by the connected backplane circuitry or external power supply, and are unaffected by the voltage or current on other electrodes.

[0076] As used in this article, the term "luminescent area" refers to the portion of a planar area where the anode, organic layer, and cathode overlap, excluding light extraction effects.

[0077] As used herein, the term "light-emitting surface" refers to the side of a light source that emits light. For example, if the light source comprises a bottom-emitting OLED panel, then the "light-emitting surface" comprises the side of the substrate away from the anode; if it is a top-emitting device, then the "light-emitting surface" comprises the side of the encapsulation layer away from the cathode. As used herein, the term "primary light-emitting surface" refers to the large-area light-emitting side of a surface light source (such as the OLED panel described herein).

[0078] As used in this article, the term "single-layer device" refers to a device having a single light-emitting layer (or multiple consecutive light-emitting layers) and a single set of hole and electron transport layers between a pair of anodes and cathodes. Such a device with a single light-emitting layer (or multiple consecutive light-emitting layers) and its associated transport layers is called a "single-layer device".

[0079] As used in this article, the term "stacked device" refers to a device structure with multiple light-emitting layers between a pair of anodes and cathodes, each of which has its own independent hole transport layer and electron transport layer. Each light-emitting layer and its associated hole transport layer and electron transport layer constitute a light-emitting unit. These light-emitting units are connected by charge generation layers. A device with multiple light-emitting units is called a "stacked device".

[0080] As used herein, the term "optical cavity" refers to a chamber enclosed by a housing, providing a space for multiple reflections of the light beam within the cavity walls for homogenization. The bottom surface of the optical cavity facing the target, i.e., the light-emitting side, does not have a light source. Light sources are arranged on the inner surface of the cavity, excluding the bottom surface. The total luminous area of ​​all light sources accounts for no less than 50% of the total inner surface area of ​​the optical cavity, preferably no less than 80%, and more preferably no less than 90%. The light beam entering the optical cavity undergoes repeated reflection, refraction, and scattering within the cavity walls, ultimately homogenizing before exiting from the bottom surface of the optical cavity and reaching the corresponding irradiation area. As used herein, the term "bottom surface of the optical cavity" refers to the bottom surface of the space enclosed by the entire optical cavity, typically a plane formed by connecting the bottom edges of the optical cavity, which is approximately parallel to the surface to be treated.

[0081] A schematic diagram of a typical single-layer OLED device 100 is shown below. Figure 1aAs shown. The OLED device 100 includes an anode layer 101, a hole injection layer (HIL) 102, a hole transport layer (HTL) 103, an electron blocking layer (EBL) 104, an emissive layer (EML) 105, a hole blocking layer (HBL) 106, an electron transport layer (ETL) 107, an electron injection layer (EIL) 108, a cathode layer 109, and a capping layer (CPL) 110. In the bottom-emitting device, the anode layer 101 is a transparent or translucent material, including but not limited to ITO, IZO, MoOx (molybdenum oxide), etc., with a transparency generally greater than 50%; preferably, the transparency is greater than 70%; the cathode layer 109 is a material with high reflectivity, including but not limited to Al, Ag, etc., with a reflectivity greater than 70%; preferably, the reflectivity is greater than 90%. In a top-emitting device, the anode layer 101 is a material or combination of materials with high reflectivity, including but not limited to Ag, Ti, Cr, Pt, Ni, TiN, and combinations of the above materials with ITO and / or MoOx (molybdenum oxide), typically with a reflectivity greater than 50%; preferably, with a reflectivity greater than 80%; more preferably, with a reflectivity greater than 90%. The cathode layer 109 should be a translucent or transparent conductive material, including but not limited to MgAg alloy, MoOx, Yb, Ca, ITO, IZO, or combinations thereof, with a transparency generally greater than 30%; preferably, with a transparency greater than 50%. The hole injection layer 102 can be a single material layer, such as the commonly used HATCN; the hole injection layer 102 can also be a hole transport material doped with a certain proportion of p-type conductive dopant, typically with a doping ratio not exceeding 5%, commonly between 1% and 3%. The light-emitting layer 105 typically also includes at least one host material and at least one light-emitting material, while the electron blocking layer 104 and hole blocking layer 106 are optional layers; in bottom-emitting devices, a capping layer 110 is generally not required. The electron transport layer 107 can be a single layer of Yb, LiQ or LiF, or it can be formed by co-evaporation of two or more materials. Figure 1b This is a schematic diagram of the structure of a multicolor OLED device 130. With other layers remaining unchanged, the light-emitting layer can include one light-emitting layer 1051 and one light-emitting layer 1052. The peak wavelength of light-emitting layer 1051 can be between 600-750 nm (emitting red light), and the peak wavelength of light-emitting layer 1052 can be between 750-1400 nm (emitting near-infrared light). Note that the order of these two light-emitting layers can also be reversed, i.e., light-emitting layer 1051 emits near-infrared light, and light-emitting layer 1052 emits red light. This OLED device structure can emit both red and near-infrared light simultaneously. Figure 1cThis is a schematic diagram of a color-changing OLED device 120, which has an emissive layer 1053, an emissive layer 1055, and a modulating layer 1054. The modulating layer 1054 can regulate the movement of electrons and holes at different current densities, thereby achieving color control. For example, the peak wavelength of the emissive layer 1053 can be between 600-750 nm (emitting red light), and the peak wavelength of the emissive layer 1055 can be between 750-1400 nm (emitting near-infrared light). At low current densities, the exciton recombination region is mainly close to the cathode side, i.e., in the emissive layer 1053, at which point the OLED device 120 can emit red light. As the injection is gradually increased, and the voltage and current density are improved, the exciton recombination region moves towards the anode side and eventually enters the near-infrared emissive layer 1055, at which point the OLED device 120 emits near-infrared light. Of course, the emissive layer 1053 can also emit near-infrared light, and the emissive layer 1055 can emit red light, and vice versa. For details regarding the structure and use of the modulation layer in the color-changing OLED device, please refer to the inventors' previous patent applications CN111081891A and CN111081892A. A down-conversion layer 111 can also be provided above the capping layer 110 of the OLED device 140, such as... Figure 1d As shown. The downconversion layer 111 contains a photoluminescent material whose absorption spectrum overlaps with the emission spectrum of the light-emitting layer 105. For example, if the light-emitting layer 105 emits red light, the downconversion layer 111 can absorb the red light and emit longer-wavelength near-infrared or infrared light. The photoluminescent material contained in the downconversion layer 111 includes, but is not limited to, quantum dot materials, perovskite materials, phosphor materials, organic light-emitting materials, etc. If the OLED device 140 is a bottom-emitting device, the downconversion layer 111 can be disposed below the anode 101, and is not shown in the figure. It should be noted that although... Figures 1b to 1d The devices shown can emit multiple colors, but they are controlled by only one pair of anode and cathode electrodes, with only one circuit loop between the two electrodes. Therefore, the emission of different colors is not independently controlled and cannot be adjusted relatively independently. This is fundamentally different from the device structure shown in this application. Nevertheless, any individual device in this application can still be used... Figures 1a-1d The structure in.

[0082] A schematic diagram of a typical stacked OLED device 200 is shown below. Figure 2As shown, it includes an anode layer 201, a first light-emitting unit 202, a charge generation layer (CGL) 203, a second light-emitting unit 204, and a cathode layer 205. The first light-emitting unit 202 and the second light-emitting unit 204 may further include a series of organic layers from the hole injection layer 102 to the electron injection layer 108 in the monolayer light-emitting device 100. The light-emitting layers of the first light-emitting unit 202 and the second light-emitting unit 204 may be the same or different. The first light-emitting unit 202 and the second light-emitting unit 204 can emit light of the same color, for example, both emitting red light with a peak wavelength between 600-750 nm; the first light-emitting unit 202 and the second light-emitting unit 204 can also emit light of different colors, for example, the first light-emitting unit 202 emitting red light with a peak wavelength between 600-750 nm, and the second light-emitting unit 204 emitting near-infrared light with a peak wavelength between 750-1400 nm. In this case, the device 200 can emit both red light and near-infrared light simultaneously. The charge generation layer 203 generally comprises an n-type material and a p-type material, and a buffer layer may be further added, as described in patent application CN112687811A, but this is not the focus of this invention and will not be elaborated here. If the stacked device is a top-emitting device, a capping layer (not shown in the figure) may also be added on top of the cathode layer 205. Figure 2 The diagram shows a stacked device containing two light-emitting units. A third light-emitting unit and a second charge-generating layer can be added to form a stacked device containing three light-emitting units. The fabrication of both single-layer and stacked OLED devices is well-known in the industry and will not be elaborated upon here. It is important to note that the charge-generating layer in a stacked device is not electrically connected to the external contact electrode and therefore is not independently controllable. Although this application also involves the stacking of multiple OLED devices, the intermediate electrode is electrically connected to the external contact electrode, thus allowing independent control of the upper and lower light-emitting units. This is fundamentally different from traditional stacked devices. Nevertheless, any individual device in this application can still be... Figure 2 The stacked device structure shown.

[0083] A flexible OLED light source can be a flexible OLED light-emitting panel. A cross-sectional view of a flexible OLED light-emitting panel is shown in Figure 3. The flexible OLED light-emitting panel 300 includes a flexible substrate 301, an OLED device 302, a pair of contact electrodes 304 electrically connected to the OLED device 302, and a flexible encapsulation layer 303 that exposes the contact electrodes 304. The flexible substrate 301 can be an ultrathin flexible glass, preferably a shatterproof material, including but not limited to plastics (PET, PEN, PI), textiles, leather, paper, metal foil, or combinations thereof. In particular, the substrate 301 can be a material (e.g., PI, i.e., Polyimide) pre-coated in solution form on a support substrate, cured and planarized, and then used for device fabrication. After device fabrication is completed, it is peeled off from the support substrate using a laser and transferred onto other flexible films as needed. A moisture-blocking layer (not shown in the figure) can be additionally coated on the flexible substrate 301. The OLED device 302 can be a bottom-emitting device or a top-emitting device, preferably a top-emitting device because of its higher luminous efficiency. The OLED device 302 can be a single-layer structure or a multi-layer structure. A multi-layer structure is preferred because it has a longer lifespan at the same brightness, and the thicker film layer improves production yield. The organic material in the OLED device 302 can be formed by thermal evaporation in a vacuum chamber (vacuum evaporation method), or it can be formed partially or entirely using solution methods, including but not limited to inkjet printing, spin coating, and organic vapor jet printing (OVJP). The flexible encapsulation layer 303 can be an ultra-thin glass adhered to the device using UV-curable adhesive. Preferably, the flexible encapsulation layer 303 is a thin-film encapsulation layer, typically with a thickness of 5 μm or more, such as a single-layer inorganic thin film or a multi-layer structure alternating between organic and inorganic thin films, formed by PECVD, ALD, printing, spin coating, etc. The contact electrode 304 can include at least one anode contact and one cathode contact. Based on this, a light extraction layer, a front cover film, a back cover film, and external circuitry (such as an FPC circuit board) can be added. A detailed description can be found in Chinese patent application CN108644628A, which is incorporated herein by reference in its entirety, but is outside the scope of this application. Such a flexible OLED light-emitting panel, when electrically connected to an external electric drive (regardless of whether it is in an on or off state), becomes a flexible OLED light source, which is one of the basic components of this invention. The OLED devices in the aforementioned flexible OLED light-emitting panel all use a common organic layer, especially a common organic light-emitting layer, i.e., non-pixelated processing, emitting only one color of light at a fixed operating point. The aforementioned flexible OLED light-emitting panel can emit at least one wavelength between 400-1400 nm, preferably 600-1400 nm, and more preferably 600-970 nm.

[0084] like Figure 4a The diagram shows an overall schematic of a phototherapy bandage 400, which includes a phototherapy unit 401 and a fixing structure 402. Figure 4b The diagram shown is an exploded view of the phototherapy adhesive bandage 400. Further details reveal that the phototherapy unit 401 includes a housing 4010 and three OLED light-emitting panels 4011, with the light emission direction of the panels 4011 facing inwards towards the phototherapy unit. A fixing structure 402 secures the phototherapy adhesive bandage 400 to the wound or area to be treated. The fixing structure 402 may include a backing and adhesive, and may further include a release liner (not shown in the diagram). The backing provides fixation and basic protection; its material is diverse, including but not limited to elastic fabric, PE (polyethylene) / PU (polyurethane) film, non-woven fabric, PVC film, and foam film. Adhesive is applied to the inside of the backing to secure the bandage to the skin. The adhesive needs to have good adhesion and low allergenicity; common types include, but are not limited to, medical pressure-sensitive adhesives, zinc oxide adhesives, rubber adhesives (natural rubber), medical hot melt adhesives (synthetic rubber), and acrylic adhesives. The release liner is a protective layer applied to the adhesive and absorbent pad before use to prevent contamination and adhesion. It needs to be removed before use. Common materials include, but are not limited to, anti-stick release paper, PE release film, or glassine paper. The projection portion 4020 of the phototherapy unit 401 on the fixing structure 402 (e.g., Figure 4b The projection section 4020 (as shown) can be perforated, allowing the light emitted by the phototherapy unit 401 to shine unobstructed onto its projection coverage area, i.e., the area to be treated. This design is more suitable for acne treatment because acne typically protrudes from the skin surface, and the treatment process requires breathability to reduce further pore blockage and bacterial infection caused by surface coverage. Of course, the projection section 4020 can also be further equipped with a wound-protecting layer, which can directly contact the wound surface to absorb small amounts of exudate and provide a relatively suitable healing environment. It typically contains added medications for antibacterial purposes, and its materials include, but are not limited to, non-woven fabrics, viscose fibers, and polypropylene fibers. Preferably, the wound-protecting layer has a high light transmittance, typically not less than 20%, preferably not less than 50%, and more preferably not less than 70%. The shape of the fixing structure 402 can be as follows: Figure 4a and 4b The ring shape can also be other shapes, such as a strip shape. The fixing structure 402 is well known to those in the field and will not be described in detail here.

[0085] At least one OLED light-emitting panel is disposed inside the housing 4010, such as Figure 4a and 4bThe phototherapy bandage 400 shown contains three triangular OLED light-emitting panels 4011, which can be rigid or flexible. The light emission direction of all three light-emitting panels 4011 is directed towards the interior of the phototherapy unit, as shown in the figure. The light emitted by the OLED light-emitting panels 4011 has a wavelength range between 400-1400 nm. Preferably, the emitted light wavelength range is deep red and near-infrared light, specifically deep red light, between 600 nm and 1400 nm. More preferably, blue light with a wavelength range of 400-500 nm can be further emitted. These two light ranges can be lit simultaneously or in stages. In this case, blue light can be used to sterilize wounds or acne, while the deep red and near-infrared light portions can accelerate wound healing. The scheme for achieving multi-color light emission is as follows:

[0086] The first approach involves designing a pixelated layout on a single OLED panel and then driving each pixel independently, or grouping the pixels and driving different groups independently. OLED panels are flexible, meaning they use flexible substrates and thin-film encapsulation. The pixels here typically have a light-emitting area on the order of millimeters, meaning the minimum size is greater than 1 mm. 2 Preferably greater than 5 mm 2 .For example, Figure 5a A flexible OLED light-emitting panel 500, as shown, may include a flexible OLED substrate 501 on which a series of OLED devices 502 are patterned and fabricated. These devices share the same thin-film encapsulation layer 503. Each light-emitting unit is then an OLED device, and the entire flexible OLED light-emitting panel constitutes a light source. Metal wiring can be arranged on the panel simultaneously with the fabrication of the anode or cathode to electrically connect the various OLED devices 502. The method of metal wiring is well-known in the field and will not be elaborated upon here. By controlling different OLED devices through a circuit control system, different devices can emit different colors of light, or the same device can operate under different currents, thereby achieving multiple colors.

[0087] A variation of this scheme is as follows: Figure 5bThe flexible OLED light-emitting panel 510 shown includes a flexible OLED substrate 501 and a series of OLED devices 502, each with its own encapsulation layer 513, preferably a thin-film encapsulation layer. In this case, the different OLED devices 502 can be connected not only by metal wiring but also by an FPC circuit board, greatly improving conductivity and reducing circuit complexity. Similarly, these electrical connections allow for the independent driving of one or more OLED devices 502. In both cases, to emit different colors of light, different device structures can be deposited onto different OLED devices using a metal mask, particularly by changing the material of the light-emitting layer; alternatively, as described in patent applications CN111081892A and CN111081891A, all devices can use the same independent unit multi-emitting-layer structure, achieving color changes by utilizing the movement of the recombination region at different operating points.

[0088] Another approach is to arrange individual OLED light-emitting panels into an array, such as... Figure 5c As shown, each OLED light-emitting panel at this stage comprises an independent substrate 521, an OLED device 502, and an independent encapsulation layer 513. The advantage of this arrangement is that non-flexible OLED light-emitting panels and / or non-flexible encapsulation layers can be used. As long as the area of ​​each OLED light-emitting panel is small enough, the light source assembled into an array can still possess a certain degree of flexibility. However, it is preferable that each individual OLED light-emitting panel is also flexible. These individual OLED light-emitting panels can be cut from the same motherboard, for example, all using the same independent unit multi-emitting layer structure, or they can be reassembled using devices with different structures selected from different motherboards. The advantage of this approach is that it allows for device screening, improves yield, and increases the diversity of product colors. Figure 5c The individual light-emitting panels shown can be arranged and combined as needed using FPCs or front and rear cover films to form a physically connected dot matrix. Specific details can be found in the method disclosed in CN208750423U, but this is not the focus of this application and will not be elaborated further. Similarly, these panels can be independently controlled, receiving different operating currents. The aforementioned array arrangement not only enables multi-color emission but also zoned control. For example, phototherapy products can be controlled to provide phototherapy only to designated areas, or the intensity or duration of light exposure can be varied in different areas. This selectable localized illumination can further reduce power consumption and save energy.

[0089] The three triangular OLED light-emitting panels 4011 included in the phototherapy bandage 400 can have identical or different physical dimensions; preferably, they are identical for ease of manufacturing. The size of the OLED light-emitting panels 4011 can be selected according to the size of the wound, and different wound sizes can be adapted by designing the size and combined height of the triangles. The lower the height, the higher the irradiance of the light emitted by the OLED panel 4011 reaching the wound, resulting in more effective treatment. The light-emitting panels 4011 can have different sizes and corresponding combinations, such as... Figure 6a and 6b The diagram shows an overall view and an exploded view of another phototherapy bandage 600. Its phototherapy unit 601 uses four triangular OLED light-emitting panels 6011. Preferably, these four OLED light-emitting panels 6011 have the same physical dimensions. Each OLED panel 4011 can be embedded within a housing and can be bonded together with adhesive or with gaps. When there are gaps between the OLED light-emitting panels 4011, the housing is positioned at the corresponding gaps as follows: Figure 4b At position 4012, openings can be provided to facilitate air circulation, accelerate wound healing, or reduce acne worsening. In some embodiments, the geometry can be slightly modified to suit process requirements. For example... Figure 12a The figure shown is a triangular-like shape; although it has three small tangents, it is still roughly a triangle.

[0090] The housing 4010 also houses an electric drive device for powering the OLED light-emitting panel 4011, which is not shown in the figure. The electric drive device is also integrated into the housing 401 and is electrically connected to the OLED light-emitting panel 4011. The electrical connection includes, but is not limited to, one or more of thin-film metal, transparent conductive materials, and FPC leads. The electric drive device includes, but is not limited to, one or more of a power supply, a charging device (preferably a wireless charging device), a Bluetooth communication device, a chip, leads, a circuit board, and a switch, wherein the power supply includes a battery, which can be selected from one or more of thin-film batteries, micro batteries, button batteries, chemical batteries, lithium batteries, and hydrogen batteries. The electric drive device can also wirelessly connect to an external electronic device via Bluetooth, and be controlled by the external electronic device through an application (APP), such as function selection (detection or phototherapy), phototherapy switch, phototherapy brightness adjustment, selection of duration or timer, and phototherapy zone control. The external electronic device can be a smartphone, smartwatch, tablet, laptop, smart glasses, and other AR / VR devices.

[0091] like Figure 4a and 4bWhen the phototherapy bandage 400 shown is used, the OLED light-emitting panel 4011 is illuminated by a driving device. Since the OLED is a Lambertian light source, a portion of the light emitted by the OLED panel is directly directed towards the wound (i.e., the surface to be treated), while another portion is emitted from other angles and reaches the surfaces of the other two panels. Furthermore, because both bottom-emitting and top-emitting devices have one electrode that is a reflective metal surface, the surface of the OLED panel exhibits specular reflection. Thus, although some light does not directly reach the wound, it encounters adjacent panels and is reflected back, ultimately reaching the wound through multiple reflections. In another embodiment, a scattering film can also be provided on the emitting surface of the OLED light-emitting panel 4011. This allows for greater light extraction, and the light emitted by adjacent panels is also scattered across each other's surfaces, similarly reaching the wound. The housing within the phototherapy unit encloses a light cavity. Except for the light-emitting bottom surface facing the fixed structure, the remaining inner surface of the light cavity is completely covered by an OLED light-emitting panel. While the OLED panel does not need to completely cover the entire cavity, the luminous area of ​​the light source within the cavity must account for at least 50% of the total inner surface of the cavity, preferably at least 80%, and more preferably at least 90%. Furthermore, the non-luminous areas within the entire inner surface of the cavity can be covered with reflective or scattering structures. This allows the light beam within the cavity to be repeatedly reflected, refracted, and scattered on the cavity walls, ultimately reaching the treatment surface (the projection plane of the light cavity on the bottom surface). Although the light source itself is some distance from the wound, the internal reflection ensures that the irradiance reaching the wound is still sufficiently high. This significantly improves phototherapy efficiency compared to existing methods using LED light sources, especially those with top-mounted light sources. Typically, the irradiance of the bottom surface of the light cavity is not less than 1 mW / cm². 2 Not higher than 50 mW / cm 2 Preferably, it is not less than 3 mW / cm 2 Not higher than 10 mW / cm 2 To improve the phototherapy effect, the height of the light cavity should not be too high, not exceeding 2 cm, preferably not exceeding 1.5 cm. Simultaneously, to cover a larger phototherapy area, the apex angle of the light cavity is adjustable, and the ratio of height H to the equivalent radius r of the base surface, H / r, is ≤ 1.73, preferably ≤ 1.0; more preferably ≤ 0.577, so that the conical surface forms a larger illumination range on the irradiation surface. The top of the light cavity is approximately conical; if it is a cone, its semi-apex angle is not less than 30 degrees, preferably not less than 45 degrees; if it is a pyramid, its plane angle is not less than 30 degrees, preferably not less than 45 degrees; if it is the apex angle of a tetrahedron, its dihedral angle is not less than 45 degrees, preferably not less than 60 degrees.

[0092] Since both the electric drive device and the OLED light-emitting panel are integrated into the housing 401, the housing itself can be designed to be detachable. An adhesive layer can be applied to the surface where the fixing structure 402 and the housing 4010 meet. This adhesive layer can be applied to the fixing structure 402 or the housing 401, preferably to the fixing structure 402. In use, the fixing structure 402 can be removed first, applied to the area to be treated, ensuring the wound is exposed through the opening in the fixing structure, and then the phototherapy unit 401 can be adhered to the fixing structure 402 to cover the wound; alternatively, the phototherapy unit 401 can be adhered to the fixing structure 402 first, and then the entire unit can be applied to the area to be treated. After use, the entire phototherapy bandage can be removed. The fixing structure 402, due to its low cost and for hygiene reasons, can be discarded, while the phototherapy unit 401 can be recharged or have its battery replaced for repeated use. This method of use is both economical and environmentally friendly, significantly lowering the barrier to entry for using phototherapy bandages.

[0093] like Figure 7a and 7b The diagram shown is an overall schematic and exploded view of another phototherapy bandage 700, which includes a phototherapy unit 701 and a fixing structure 702. The phototherapy unit 701 contains a flexible OLED light-emitting panel 7011. A two-dimensional planar view of the unfolded flexible OLED light-emitting panel 7011 is shown below. Figure 7c As shown, due to its flexibility, it can be formed around the axis AA' as... Figure 7a The cone shape is shown. When the flexible OLED light-emitting panel 7011 is enclosed, a portion of the non-light-emitting area 7012 can be left as a contact electrode and / or as a part to be bonded to the housing 701. Preferably, since the OLED light-emitting panel 7011 is flexible, its contact electrode portion can be folded to achieve full light emission when viewed from inside the housing 701, such as... Figure 7d As shown, at this point, only a single line mark 7013 will remain on the folded and joined portion. Of course, in another embodiment, multiple flexible OLED light-emitting panels can also be used, such as... Figure 8a and 8b As shown in the phototherapy bandage 800, each fan-shaped flexible OLED light-emitting panel 8011 is integrated on a housing 801 and emits light within the housing. One benefit of this split OLED light source is that it can increase the yield of the device. Similarly, each fan-shaped OLED light-emitting panel 8011 preferably has the same physical dimensions.

[0094] In the above embodiments, the phototherapy unit has a pointed structure. To avoid the risks associated with the pointed structure, a method such as... Figure 9a and 9b The phototherapy bandage 900 shown has a rounded housing 901. In another embodiment, a similar method can also be used. Figure 10The phototherapy bandage 1000 shown has a flat top on its shell 1001. In addition to the OLED light-emitting panels 1011 around the perimeter, an OLED light-emitting panel 1012 can be further integrated under the flat top to form a light cavity. Similarly, the same measure can be used for the conical phototherapy bandages shown in Figures 7 and 8, making the original pointed top flat to reduce safety hazards.

[0095] In another embodiment, the following can be used: Figure 11 The dome-shaped phototherapy bandage 1100 shown has a semi-circular or near-semi-circular shell 1101. A series of flexible OLED light-emitting panels 1111 are integrated within the shell 1101, and the entire shell is then adhered to a fixing structure 1102. Of course, as... Figure 11 The dome-shaped housing shown can also integrate a series of smaller rigid OLED light-emitting panels, such as pentagons and triangles, and their combination can realize a dome-like light cavity.

[0096] In some embodiments, the size of the optical cavity can be adjusted in real time as needed. For example, in Figure 7a and 7b Based on the phototherapy bandage shown, a shell can be designed to make the entire phototherapy unit deformable. Due to the use of flexible OLED light-emitting panels, they can be rolled into different conical shapes to form light cavities of different sizes. The shell housing the flexible OLED light-emitting panels is also flexible and can change shape along with the OLED panels. Simultaneously, some locking or adhesive structures can be provided on the shell, allowing for different degrees of enclosure, thereby achieving adjustment of the light cavity size. Locking and adhesive structures include, but are not limited to, Velcro, magnets, latches, and sliding rails. In the phototherapy bandage embodiment shown in Figures 4 and 6, the shell can also be modified so that the shell portion between the OLED light-emitting panels is flexible, including but not limited to being stretchable, bendable, and rollable. This allows the entire light cavity volume to be enlarged or reduced by stretching this portion of the shell. Preferably, the surface of this stretchable shell inside the light cavity is a reflective or scattering surface. Figure 11 Based on the dome-shaped phototherapy bandage shown, the shell can be made of a material with certain shaping properties, including but not limited to copper foil and aluminum foil. The shell between the OLED light-emitting panels can also be made of a flexible material. In this case, directly pressing the entire phototherapy unit reshapes the shell. Simultaneously, because the shell between the panels is stretchable, the shape of its light cavity can be changed. When using these variable phototherapy bandages, simply stretch the phototherapy unit to cover the area to be treated, then find the corresponding fixing structure and adhere the phototherapy unit to the fixing structure to perform the treatment.

[0097] To verify the unique advantages of this phototherapy bandage with its distinctive structure compared to the planar structure of existing technologies, the inventors fabricated and assembled an actual device. The device layout of a comparative example is shown below. Figure 12a As shown, the completed comparison example lighting status diagram is as follows. Figure 12b As shown. Its glass substrate has a shape of 1201, and its light-emitting area 1202 is 1.43 cm². 2 Note that although Figure 12a The diagram shown has six sides, but is still triangular overall, so it belongs to the triangular-like category. The device fabrication is as follows: First, a 0.5 mm thick glass substrate is pre-sputtered with a 1200 Å thick layer of ITO as the anode. The substrate is then annealed in a heating chamber for 50 min before being transferred to the chamber. The organic layer specified below is prepared under a vacuum of approximately 1 × 10⁻⁶. -6 Under Torr conditions, the anode layer was sequentially deposited via vacuum thermal evaporation at a rate of 0.01–10 Å / s: First, compounds HT and HI were simultaneously deposited as the first hole injection layer (HIL, 97:3, 100 Å), compound HT was deposited as the first hole transport layer (HTL, 400 Å), and compound EB was deposited as the electron blocking layer (EBL, 50 Å). Then, compounds A-2 and RD were simultaneously deposited as the light-emitting layer (EML, 97:3, 400 Å), compound HB was deposited as the hole blocking layer (HBL, 50 Å), compound ET and LiQ (8-hydroxyquinoline-lithium) were co-deposited as the electron transport layer (ETL, 40:60, 350 Å), LiQ was deposited as the electron injection layer (EIL, 10 Å), and metallic Al was deposited as the cathode (Cathode, 1000 Å). The device was then transferred back to the glove box and sealed with a glass cover to complete the device. The structure of the above materials is shown below:

[0098] , , , , , , , .

[0099] The inventors further conducted irradiance testing experiments on the embodiments and comparative examples. In Embodiment 1, four comparative examples were tested according to... Figure 6a The structure was assembled in three dimensions, and conductive adhesive was used for electrode connection. The height of the entire phototherapy unit in Example 1 was 15 mm. Example 1 was only used to verify the effect of the phototherapy unit, so it was not further integrated into the housing.

[0100] The implementation method of Example 2 is the same as that of Example 1, except that the height of the entire phototherapy unit is adjusted to 20 mm.

[0101] In actual use, the plane at the bottom of the optical cavity is the surface to be treated. We need to know the irradiance reaching this surface. The irradiance in Examples 1 and 2 was tested using a CL-500A. The test plane was the plane where the bottom of the optical cavity was located, and the test results were recorded in Table 1.

[0102] Table 1. Irradiance test results of Examples 1 and 2 at different phototherapy unit heights.

[0103]

[0104] As can be seen from Table 1, the projection of the optical cavity onto the plane in Example 1, i.e., the effective treatment area, is 11.56 cm². 2 In Example 2, the optical cavity is higher, resulting in an effective treatment area of ​​9 cm². 2 The optical cavities in Examples 1 and 2 are approximately square when projected onto a plane. Both Examples 1 and 2 used four comparative light sources; therefore, the actual luminous area of ​​the light sources in Examples 1 and 2 is the same, both being 5.72 cm². 2 After three-dimensional assembly, the effective treatment area in Examples 1 and 2 is larger than the actual light-emitting area of ​​the light source itself. A photograph of Example 1 after illumination is shown below. Figure 12c As shown.

[0105] In addition, irradiance tests were conducted at different distances from the light source of the comparative example. Since the light source is a single light source, it is generally parallel to the surface to be treated. Therefore, the irradiance was measured at different distances from the light source or the surface perpendicular to the light source plane. For comparative example 1, a Konica Minolta CL-500A spectrophotometer was used to measure the irradiance at a position perpendicular to the light-emitting surface of the comparative example and at a distance of 0.

[0106] The implementation method of Comparative Example 2 is the same as that of Comparative Example 1, except that the distance is adjusted to 15 mm.

[0107] The implementation method of Comparative Example 3 is the same as that of Comparative Example 1, except that the distance is adjusted to 20 mm.

[0108] Table 2 lists the irradiance test results of Comparative Examples 1 to 3 at different distances between the light source emitting plane and the test plane.

[0109] Table 2. Irradiance test results of Comparative Examples 1 to 3 at different test distances

[0110]

[0111] As can be seen from Table 2, although Comparative Example 1 achieved an irradiance of 5.82 mW / cm² at a test distance of zero, 2However, as the testing distance increased, the irradiance decreased sharply. When the measurement distance of Comparative Example 2 was 15 mm, the irradiance dropped to 0.70 mW / cm². 2 When the measurement distance in Comparative Example 3 was 20 mm, the irradiance decreased to 0.44 mW / cm². 2 Therefore, to avoid direct contact between the light source and the wound or acne surface, a certain safe distance needs to be maintained. However, if a traditional planar light source is used, increasing the distance will significantly reduce the effective irradiance, failing to meet treatment requirements. Furthermore, the effective treatment area of ​​a single planar light source is equal to its own luminous area, severely limiting the treatment range.

[0112] When using Examples 1 and 2, the effective treatment area is significantly increased. More importantly, although Examples 1 and 2 do not contact the treatment surface, they still maintain a strength greater than 1 mW / cm². 2 The irradiance is currently recognized as the lower limit of irradiance for PBM effect. That is, the phototherapy bandage of this application can avoid contact with the surface to be treated due to the presence of the light cavity, while maintaining a high effective irradiance. It should be understood that this embodiment is for illustrative purposes only; different light source sizes and assembly methods can be used to achieve the desired effect.

[0113] Therefore, the phototherapy bandage disclosed in this invention can achieve non-contact phototherapy and is suitable for wound healing, acne treatment and other fields. The effective treatment area and light emission utilization rate are greatly improved, which can achieve better phototherapy effect. It is easy to wear. In addition, the phototherapy unit can also be equipped with a driving device, making the phototherapy unit an independent detachable component that can be reused, making it more economical and environmentally friendly.

[0114] It should be understood that the various embodiments described herein are merely examples and are not intended to limit the scope of the invention. Therefore, as will be apparent to those skilled in the art, the claimed invention may include variations of the specific embodiments and preferred embodiments described herein. Many of the materials and structures described herein can be substituted with other materials and structures without departing from the spirit of the invention. It should be understood that various theories regarding why the invention works are not intended to be limiting.

Claims

1. A phototherapy bandage, comprising a phototherapy unit and a fixation structure; the phototherapy unit is disposed on one side of the fixation structure; The phototherapy unit includes a housing, at least one OLED light-emitting panel, and a driving device. The at least one OLED light-emitting panel and the driving device are disposed on the housing, and the driving device is electrically connected to the at least one OLED light-emitting panel. The at least one OLED light-emitting panel emits light with a wavelength of 400-1400 nm; The housing encloses and forms a light cavity; except for the bottom surface of the light cavity facing the fixed structure, the remaining inner surfaces of the light cavity are provided with OLED light-emitting panels, and the light-emitting area of ​​the OLED light-emitting panels accounts for no less than 50% of the total area of ​​the inner surface of the light cavity; The light transmittance of the projection portion of the fixed structure corresponding to the phototherapy unit is not less than 20%.

2. The phototherapy bandage as described in claim 1, wherein the shell is flexible; Preferably, the top of the housing is smooth; More preferably, the OLED light-emitting panel is flexible; Most preferably, the phototherapy unit includes at least two OLED light-emitting panels, each of which is fan-shaped.

3. The phototherapy bandage as described in claim 1, wherein the irradiance of the bottom surface of the photocavity is not less than 1 mW / cm². 2 Not higher than 50mW / cm 2 ; Preferably, it is not less than 3 mW / cm 2 Not higher than 10 mW / cm 2 .

4. The phototherapy bandage as described in claim 1, wherein the portion of the fixing structure corresponding to the projection of the phototherapy unit is hollowed out; or includes a wound-protecting layer.

5. The phototherapy bandage as described in claim 1, wherein the photocavity is of a regular shape; Preferably, the optical cavity is pyramidal, frustum-shaped, conical, or dome-shaped; More preferably, the optical cavity is triangular pyramidal, quadrangular pyramidal, or conical.

6. The phototherapy bandage as described in claim 1, wherein the at least one OLED light-emitting panel can emit light of two colors with wavelengths of 400-500 nm and 600-1400 nm.

7. The phototherapy bandage as described in claim 1, wherein the light-emitting surface of the at least one OLED light-emitting panel includes a scattering layer.

8. The phototherapy bandage as described in claim 1, wherein the OLED light-emitting panels are provided with gaps between each other, and the housing is provided with an opening at a position corresponding to the gap.

9. In the phototherapy bandage as described in claim 1, the luminous area of ​​the OLED light-emitting panel accounts for no less than 80% of the total surface area of ​​the light cavity; preferably, no less than 90%.

10. The phototherapy bandage as described in claim 1, wherein the phototherapy unit is disposed on one side of the fixed structure via a detachable structure; Preferably, the detachable structure is selected from Velcro, snaps, magnets, and adhesives.

11. The phototherapy bandage as described in claim 1, wherein the size of the optical cavity is adjustable; Preferably, the OLED panel and the housing are flexible, and the size of the light cavity can be adjusted by changing the enclosure shape of the OLED panel and the housing; More preferably, the OLED panel and housing are adjusted to change the size of the light cavity by rolling, stretching, and shaping.

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