Wearable phototherapy device

Abstract

The invention discloses a wearable phototherapy device. The wearable phototherapy device comprises an OLED light-emitting panel, a photochromic layer and an electric driving device. According to the wearable phototherapy device, particularly, the photochromic layer is excited by the emergent light of the photochromic layer, the transparency can be adjusted along with light emitting or non-light emitting of the OLED device, even a mirror surface effect is presented, and the light of the OLED is reflected back to a to-be-treated part. The photochromic layer can also be patterned, so that the utilization rate of light is improved, and the aesthetic property during wearing is enhanced.

Description

Technical Field

[0001] The present invention relates to the field of wearable phototherapy products, and in particular, to a wearable phototherapy device. The wearable phototherapy device includes an OLED light-emitting panel, a photochromic layer, and an electric drive device. Background Art

[0002] In the mid- to late 20th century, technologies such as Low Light Laser Treatment and Photobiomodulation (PBM) emerged, both of which use light irradiation as a means of treating diseases and are applied in the medical field (Michael R. Hamblin, Ying-ying Huang, Handbook of Photomedicine, CRC Press). In recent years, a number of studies have shown that red light to near-infrared light irradiation helps to promote the regeneration of tissues such as collagen and skin cells, and can be applied in the fields of anti-wrinkle beauty, wound healing promotion, freckle and scar removal, etc. (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 low light laser treatment and photobiomodulation technologies, more and more phototherapy products have emerged, especially wearable phototherapy products. For example, phototherapy masks, phototherapy hair growth caps, phototherapy shaping clothes, eye phototherapy devices, etc. have become ideal home beauty, body shaping or health care products for more and more people.

[0003] The light source used in phototherapy products can emit light with a peak wavelength between 400 - 1400 nm. Preferably, it emits red light and near-infrared light with a peak wavelength between 600 - 970 nm. The light in this wavelength band has functions such as anti-wrinkle, skin regeneration, freckle removal, and even anti-inflammatory effects (such as for hordeolum, acne), wound healing, and scar fading (Daniel Barolet, Semin Cutan Med Surg, 27:227 - 238, 2008). The light source in phototherapy products can also emit blue light with a wavelength of 400 - 500 nm. The light in this wavelength band has bactericidal and anti-inflammatory effects and can reduce the risk of wound infection. For example, it can be used to treat acne effectively. In some phototherapy products with multiple treatment effects, multiple light sources with different wavelength bands are generally used simultaneously for treatment. Most of the current phototherapy products on the market use LEDs that can 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 energy. Moreover, when these LEDs are used in an array form, they must be arranged at a certain distance from each other for heat dissipation. This results in disadvantages such as being thick and heavy, uneven light emission, and difficult assembly and maintenance in LED phototherapy products.

[0004] As a surface light source and a cold light source, OLED is not dazzling and has a thin and light characteristic, making it very easy to be integrated onto a flexible substrate, becoming an ideal light source choice in the field of phototherapy devices. Therefore, phototherapy products using OLED as the light source have a broad market prospect and have received extensive attention.

[0005] When using phototherapy products that cover the eyes, such as eye masks or facial masks, it is usually desired that the area covering the eyes is transparent during the non-treatment stage, so that the user can see the outside world and be seen by the outside world; while during the treatment stage, that is, when the product emits light towards the eyes, it is usually desired that all the light is directed towards the treatment area, and no light is directed towards or leaks to the outside world, or at least the light directed towards or leaking to the outside world can be reflected back to the treatment area.

[0006] A photochromic material refers to a material that changes its optical properties, including but not limited to color, transmittance, reflectivity, and refractive index, when stimulated by light. This is a reversible chemical change. Some glasses containing metal halides exhibit this property when doped with copper salts. Other photochromic materials can be organic, including but not limited to oxazines (such as naphthooxazines), spiropyrans, and indenonaphthopyrans, the latter two of which are used in photochromic sunglasses. Leistner et al. analyzed a variety of photochromic materials in Eur. J. Org. Chem. 2022, e202101271, including some that are stimulated by visible light, particularly red light. Patent application US20150048316A1 discloses the placement of a photochromic layer and a light-blocking layer on the light-emitting pixels of a display screen to absorb ambient light, particularly UV light. However, the placement of this layer in the display's optical path means that when used outdoors, the light emitted by the display screen itself will also be dimmed due to the dimming of the photochromic layer.

[0007] Currently, there are practical applications in the display field using photochromic materials to adjust light intensity. However, the change in transparency is due to stimulation by external ambient light. In addition, there is little research on the application of photochromic materials in the field of phototherapy, and no phototherapy products have paid attention to what changes can be produced when stimulated by their own emitted light. Summary of the Invention

[0008] The invention aims to provide a wearable light therapy device containing a photochromic material, which uses the light emitted by the device itself to excite the photochromic material, so that the photochromic material can adjust its transparency and / or reflectivity as the OLED device emits or does not emit light, and can even present a mirror effect, reflecting part of the light from the OLED device back to the area to be treated. The photochromic layer can also be patterned, which not only improves the utilization rate of light but also enhances the aesthetics when worn.

[0009] A wearable light therapy device comprising: at least one OLED light-emitting panel, a photochromic layer, and an electric drive device;

[0010] The OLED light-emitting panel comprises a transparent substrate and at least one OLED device;

[0011] The OLED device comprises a light emitting surface, emitting light having a first peak wavelength between 400 nm and 1400 nm toward a part to be treated;

[0012] The OLED device also emits light toward a side away from the area to be treated, and at least part of the light from the side away from the area to be treated is irradiated onto the photochromic layer;

[0013] The OLED device is electrically connected to the electric driving device.

[0014] The present application discloses a wearable light therapy device, which includes at least one OLED light emitting panel. A photochromic layer is arranged on one side of the OLED panel. The photochromic layer can adjust the transparency and / or reflectivity, and even present a mirror effect under the excitation of its own emitted light, reflecting the light of the OLED back to the part to be treated. The photochromic layer can also be patterned, which not only improves the utilization rate of light but also enhances the aesthetics during wearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1a-1d It is a schematic structural diagram of a single-layer OLED device.

[0016] Figure 2 It is a schematic structural diagram of a stacked OLED device.

[0017] Figure 3a-3d It is a schematic cross-sectional view of the OLED light emitting panel adopted by the present invention.

[0018] Figure 4a It is a schematic cross-sectional view of a wearable light therapy device of the present invention.

[0019] Figure 4b-4c It is a schematic diagram of the use of a wearable light therapy device of the present invention.

[0020] Figure 5a It is a schematic plan view of a wearable light therapy device of the present invention.

[0021] Figure 5b It is a schematic diagram of the light path of the wearable light therapy device of the present invention when the OLED device is lit.

[0022] Figure 6a-6b It is a schematic cross-sectional view of another OLED light emitting panel adopted by the present invention.

[0023] Figure 7a It is a schematic cross-sectional view of another wearable light therapy device of the present invention.

[0024] Figure 7b It is a schematic cross-sectional view of another wearable light therapy device of the present invention.

[0025] Figure 8 It is a schematic cross-sectional view of another wearable light therapy device of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions of the present invention will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0027] The structure of a typical single-layer OLED device 100 is as Figure 1a shown. Among them, 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 emission 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 a bottom-emission device, the anode layer 101 is a transparent or semi-transparent material, including but not limited to ITO, IZO, MoO x (molybdenum oxide), etc., and its transparency is generally greater than 50%; preferably, the transparency is greater than 70%; the cathode layer 109 is a material with a high reflectivity, including but not limited to Al, Ag, etc., and the reflectivity is greater than 70%; preferably, the reflectivity is greater than 90%. In a top-emission device, the anode layer 101 is a material or a combination of materials with a high reflectivity, including but not limited to Ag, Ti, Cr, Pt, Ni, TiN, and the combination of the above materials with ITO and / or MoO x (molybdenum oxide), and usually the reflectivity is greater than 50%; preferably, the reflectivity is greater than 80%; more preferably, the reflectivity is greater than 90%. And the cathode layer 109 should be a semi-transparent or transparent conductive material, including but not limited to Mg / Ag alloy, MoO x , Yb, Ca, ITO, IZO, or a combination thereof, and its transparency is generally greater than 30%; preferably, the transparency is greater than 50%. In a transparent device, both the anode layer and the cathode layer are transparent or semi-transparent materials, and the material selection is the same as above. At this time, light can be emitted from both sides of the anode and the cathode. 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 doping material, usually the doping proportion is not higher than 5%, and commonly used is between 1% and 3%. The emission layer 105 usually further includes at least one host material and at least one luminescent material, and the electron blocking layer 104 and the hole blocking layer 106 are optional layers, and generally do not require a capping layer 110 in a bottom-emission device. The electron transport layer 107 can be a single layer of Yb, LiQ or LiF, or can be formed by co-evaporation of more than 2 materials. Figure 1bIt is a schematic structural diagram of a multicolor OLED device 130. With other layers unchanged, the light-emitting layer can include a light-emitting layer 1051 and a light-emitting layer 1052. The peak wavelength of the light-emitting layer 1051 can be between 600 - 750 nm (emitting red light), and the peak wavelength of the 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, that is, the light-emitting layer 1051 emits near-infrared light and the light-emitting layer 1052 emits red light. The OLED device with this structure can emit red light and near-infrared light simultaneously.

[0028] Figure 1c It is a schematic structural diagram of a color-changeable OLED device 120, which has a light-emitting layer 1053, a light-emitting layer 1055, and an adjustment layer 1054. The adjustment layer 1054 can regulate the movement of electrons and holes at different current densities, thereby achieving color regulation. For example, the peak wavelength of the light-emitting layer 1053 can be between 600 - 750 nm (emitting red light), and the peak wavelength of the light-emitting layer 1055 can be between 750 - 1400 nm (emitting near-infrared light). At low current density, the exciton recombination region is mainly close to the cathode side, that is, in the light-emitting layer 1053. At this time, the OLED device 120 can emit red light; when gradually increasing the injection, raising the voltage and current density, the exciton recombination region moves towards the anode side and finally enters the near-infrared light-emitting layer 1055. At this time, the OLED device 120 emits near-infrared light. Of course, it is also possible that the light-emitting layer 1053 emits near-infrared light and the light-emitting layer 1055 emits red light, and vice versa. For the specific structure of the color-changeable OLED device and the use of the adjustment layer, reference can be made to the previous patent applications CN111081891A and CN111081892A of the present inventor. A down-conversion layer 111 can also be provided on the capping layer 110 of the OLED device 140, as Figure 1d shown. The down-conversion layer 111 contains a photoluminescent material whose absorption spectrum overlaps with the emission spectrum of the light-emitting layer 105. For example, when the light-emitting layer 105 emits red light, the down-conversion layer 111 can absorb the red light and emit near-infrared or infrared light with a longer wavelength. The photoluminescent material contained in the down-conversion 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 down-conversion layer 111 can be provided under the anode 101, which is not shown in the figure. It should be noted that although Figures 1b to 1d the devices shown can all emit multiple colors, they are only controlled by a pair of anode and cathode electrodes, and there is only one circuit loop between the two electrodes. Therefore, the emission of different colors is not independently controlled and cannot be adjusted relatively independently of each other. This is essentially different from the device structure shown in this application. Nevertheless, any independent device in this application can still adopt Figure 1a-1dThe structure in

[0029] The structure of a typical stacked OLED device 200 is as Figure 2 shown, which 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. Among them, 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 single-layer 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 may emit light of the same color, such as red light with a peak wavelength between 600 - 750 nm; the first light-emitting unit 202 and the second light-emitting unit 204 may also emit light of different colors. For example, the first light-emitting unit 202 emits red light with a peak wavelength between 600 - 750 nm, and the second light-emitting unit 204 emits near-infrared light with a peak wavelength between 750 - 1400 nm. In this case, the device 200 can emit red light and near-infrared light simultaneously. The charge generation layer 203 generally includes an n-type material and a p-type material, and a buffer layer may also be further added. As described in the patent application CN112687811A, it is not the focus of the present 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 Shown is a stacked device including two light-emitting units. A third light-emitting unit and a second charge generation layer can also be added on this basis to form a stacked device including three light-emitting units. The preparation of single-layer and stacked OLED devices is well-known in the industry and will not be elaborated here. It should be noted that the charge generation layer in the stacked device is not electrically connected to the external contact electrode and thus is not independently controlled. Although there are also multiple OLED devices stacked in this application, the middle electrode is electrically connected to the external contact electrode, so the upper and lower two light-emitting units can be independently controlled, which is also essentially different from traditional stacked devices. Nevertheless, any independent device in this application can still adopt Figure 2 the stacked device structure shown.

[0030] A light source that can be used in the phototherapy device assembly of the present invention is an organic electroluminescent device (OLED). The cross-sectional structure of an OLED light-emitting panel is as Figure 3a-3d shown. In Figure 3aAmong them, the OLED light-emitting panel 300 includes a substrate 301, an OLED device 310, a pair of contact electrodes 303 electrically connected to the OLED device 310, a packaging layer 302 (exposing the contact electrodes 303), and an adhesive structure 304 connecting the pair of contact electrodes 303 to an external driving circuit. The substrate 301 can be rigid, such as glass or acrylic, and preferably flexible, including but not limited to ultra-thin flexible glass, PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PI (polyimide), etc. In particular, the substrate 301 can be a material (such as PI material) previously coated on a support substrate in solution form, and after curing and planarization, it is used for device preparation. After device preparation is completed, it is peeled off from the support substrate using a laser and transferred to other flexible substrates as needed. The OLED device 310 can be a bottom-emitting device or a top-emitting device. Preferably, the OLED device 310 is a top-emitting device because of its higher luminous efficiency. The OLED device 310 can be a single-layer structure or a stacked structure. Preferably, the OLED device 310 has a stacked structure because its lifespan is longer at the same brightness, and because the thicker film layer is beneficial to improving the production yield. The organic materials in the OLED device 310 can be formed by thermal evaporation in a vacuum chamber, or partially or entirely using solution methods, including but not limited to ink jet printing, spin coating, organic vapor jet printing (OVJP), etc. The packaging layer 302 can be formed by covering the device with rigid glass using an adhesive, and the adhesive can be a material cured by UV. The packaging layer 302 can also be a thin film packaging layer, usually with a thickness of more than 10 μm, such as a single-layer inorganic layer, or a multi-layer structure of alternating thin film organic and inorganic layers, which can be formed by plasma-enhanced chemical vapor deposition (PECVD), atomic layer deposition (ALD), printing, spin coating, etc. The contact electrodes 303 can include at least one anode contact and at least one cathode contact. A front cover film 305 can be added to the above OLED light-emitting panel, such as Figure 3bAs shown. The front cover film 305 can be a flexible printed circuit (FPC) board, on which a pre-designed circuit is printed and electrically connected to the OLED device 310 through the bonding structure 304. In another solution, the bonding structure 304 can be an FPC frame, and the front cover film 305 can be a plastic film to provide mechanical support. The specific description of using an FPC board to drive an OLED light-emitting panel can be found in the patent application US20190376650A1, which is incorporated herein by reference in its entirety and is not within the scope of the detailed description of this application. The front cover film 305 can also include a light extraction layer. When the OLED device 310 is a top-emission device, the front cover film 305 is transparent in the light-emitting area. The front cover film 305 can be a combination of the various forms described above. The additional thin-film encapsulation layer 306 can be coated on one or both sides of the substrate 301, as Figure 3c shown. The front cover film can also be coated with the additional thin-film encapsulation layer 306, but it is not shown in the figure here. In Figure 3d , the back cover film 307 is covered onto the substrate 301. The back cover film 307 can be used for mechanical support and is usually a flexible film, such as a plastic like PET. When the OLED is a bottom-emission device, the back cover film 307 can be a light extraction layer and is transparent. The back cover film 307 can be a combination of the various forms described above. Such an OLED light-emitting panel is an OLED light source when electrically connected to an external electrical drive (regardless of whether it is in the on or off state) and is one of the basic components of the light therapy device of the present invention.

[0031] As used herein, "top" means farthest from the substrate, and "bottom" means closest to the substrate. In the case where the first layer is described as "disposed" "on" the second layer, the first layer is disposed farther from the substrate. Conversely, in the case where the first layer is described as "disposed" "under" the second layer, the first layer is disposed closer to the substrate. Unless it is specified that the first layer "contacts" the second layer, there can be other layers between the first and second layers. For example, even though there are various organic layers between the cathode and the anode, the cathode can still be described as "disposed" "on" the anode.

[0032] 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-emission), i.e., emitting light from the anode side, or top-emitting (top-emission), i.e., emitting light from the cathode side, or a transparent device, i.e., emitting light from both the anode and the cathode simultaneously. In this article, the anode (layer) and the cathode (layer) of the same "OLED device" are not in the same plane.

[0033] 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), a encapsulation layer, and at least one anode contact and at least one cathode contact extending outside the encapsulation layer for external access.

[0034] As used herein, the term "encapsulation layer" may be a thin-film encapsulation with a thickness less than 100 microns, which includes directly disposing one or more thin films onto the device, or may also be a cover glass adhered to the substrate.

[0035] As used herein, the term "independently driven" means that the operating points of two or more OLED devices are controlled separately. Although these OLED devices may be connected to the same controller or power line, there may be circuitry to divide the driving routes and supply power to each OLED device without affecting each other. An electrode is "independently driven" if the electrode can be given a voltage or current by the connected backplane circuitry or external power supply and is not affected by the voltage or current on other electrodes.

[0036] As used herein, the term "emitting area" refers to the portion of the planar area where the anode, the organic layer, and the cathode coincide, excluding the light extraction effect.

[0037] As used herein, the term "light-emitting surface" refers to the side from which the light source emits light. For example, if the light source includes a bottom-emitting OLED light-emitting panel, then the "light-emitting surface" includes the side of the substrate away from the anode; if it is a top-emitting device, then the "light-emitting surface" includes the side of the encapsulation layer away from the cathode.

[0038] As used herein, the term "single-layer device" refers to a device having a single light-emitting layer between a pair of anode and cathode (or multiple consecutive Dihydropyrenes transport layers form a light-emitting unit, and these light-emitting units are connected by charge generation layers. A device having such multiple light-emitting units is a "stacked device").

[0039] As used herein, "light on the side away from the treatment site" refers to all light other than the light emitted from the "light-emitting surface" towards the treatment site. When the OLED device is a single-sided light-emitting device, it includes the light emitted from the edge of the device. The "light on the side away from the treatment site" can be emitted in all directions other than the direction of emitting light towards the treatment site.

[0040] As used herein, the term "photochromic material" refers to a material whose optical properties, including but not limited to color, reflectivity, transmittance, refractive index, etc., change upon photoexcitation. "Photochromic materials" can be inorganic materials, including but not limited to various metal halides (AgCl, AgBr, copper-doped cadmium halides, etc.), metal oxides with transition states (such as tungsten oxide, molybdenum oxide, etc.). Photochromic materials can also be organic materials, including but not limited to oxazines (such as naphthooxazines), indenonaphthopyrans, spirooxazines and their derivative variants (such as nitrogen substitution), fulgides and their variants (such as arylfulgides), diarylethenes, benzopyrans, porphyrins & phthalocyanines, naphthopyrans, and photochromic materials that can be excited by red light include but are not limited to azobenzenes and their derivatives, azoheteroarenes, azonium and its derivatives, Diazocines-bridged azobenzenes and their derivatives, dihydropyrenes and their derivatives DASA (alkylamines + barbituric / Meldrum's acid) and its variants, spiropyrans, etc. "Photochromic materials" can usually be doped in a host material and cured to form a film. Commonly used host materials can be macromolecular polymers, including but not limited to polyurethane, polycarbonate, trivex, polyethylene terephthalate, polyethylene naphthalate, etc. The host material can also be an inorganic material, such as soda-lime glass, or borosilicate glass, etc.

[0041] According to one embodiment of the present invention, a wearable phototherapy device is disclosed, comprising: at least one OLED light-emitting panel, a photochromic layer, and an electric drive device;

[0042] The OLED light-emitting panel includes a transparent substrate and at least one OLED device;

[0043] The OLED device includes a light-emitting surface that emits light with a first peak wavelength between 400 - 1400 nm towards the treatment site;

[0044] The OLED device also emits light towards the side away from the treatment site, and at least part of the light on the side away from the treatment site irradiates the photochromic layer;

[0045] The OLED device is electrically connected to the electric driving device.

[0046] According to an embodiment of the present invention, the material of the transparent substrate can be one or more of the following materials: glass, acrylic, silicone, colorless polyimide, polyethylene terephthalate, polyethylene naphthalate, polymethyl methacrylate, natural fabric, chemical fiber, non-woven fabric.

[0047] According to an embodiment of the present invention, the transparent substrate includes a curved surface.

[0048] According to an embodiment of the present invention, the OLED device emits light with two peak wavelengths, and the difference between them is not less than 30 nm.

[0049] According to an embodiment of the present invention, the first peak wavelength of the light emitted by the OLED device is between 400 - 900 nm.

[0050] According to an embodiment of the present invention, the first peak wavelength of the light emitted by the OLED device is between 550 - 850 nm.

[0051] According to an embodiment of the present invention, the first peak wavelength of the light emitted by the OLED device is between 600 - 750 nm.

[0052] According to an embodiment of the present invention, the OLED light-emitting panel includes at least one transparent OLED device.

[0053] According to an embodiment of the present invention, the OLED light-emitting panel includes at least one single-sided light-emitting OLED device.

[0054] According to an embodiment of the present invention, the wearable light therapy device includes a plurality of OLED light-emitting panels, and the plurality of OLED light-emitting panels include at least one single-sided light-emitting OLED device.

[0055] According to an embodiment of the present invention, the wearable light therapy device includes an OLED light-emitting panel, the OLED light-emitting panel includes a plurality of OLED devices, and at least one of the plurality of OLED devices is a single-sided light-emitting device.

[0056] According to an embodiment of the present invention, the substrate and / or the thin film encapsulation layer contain a photochromic material.

[0057] In this embodiment, the substrate and / or the thin film encapsulation layer containing the photochromic material is the photochromic layer.

[0058] According to an embodiment of the present invention, the photochromic material comprises oxazines (oxazine compounds and their derivatives), indenonaphthopyrans (indenonaphthopyran compounds and their derivatives), spirooxazines (spirooxazine compounds and their derivatives), fulgides (fulgide compounds and their derivatives), diarylethenes (diaryl ethene compounds and their derivatives), benzopyrans (benzopyran compounds and their derivatives), porphyrins (porphyrin compounds and their derivatives), phthalocyanines (phthalocyanine compounds and their derivatives), naphthopyrans (naphthopyran compounds and their derivatives), azobenzenes (azobenzene compounds and their derivatives), azoheteroarenes (azo heteroarene compounds and their derivatives), azonium (azonium compounds and their derivatives), Diazocines - bridged azobenzenes (diazocine - bridged azobenzene compounds and their derivatives), dihydropyrenes (dihydropyrene compounds and their derivatives), DASA (alkylamines + barbituric / Meldrum's acid derivatives), spiropyrans (spiropyran compounds and their derivatives) and all derivatives thereof and combinations thereof.

[0059] According to an embodiment of the present invention, the photochromic layer comprises a host material, and the host material comprises polyurethane, polycarbonate, trivex (advanced urethane polymer), polyethylene terephthalate, polyethylene naphthalate, glass and combinations thereof.

[0060] According to an embodiment of the present invention, the photochromic material is doped in the substrate and / or the thin - film encapsulation layer.

[0061] In this embodiment, the substrate and / or the thin - film encapsulation layer doped with the photochromic material is the photochromic layer.

[0062] According to an embodiment of the present invention, the photochromic material can also be doped in at least one organic layer of the thin - film encapsulation layer.

[0063] According to an embodiment of the present invention, when the OLED device is a transparent device, all the light emitted by the OLED device can irradiate the photochromic layer.

[0064] According to an embodiment of the present invention, when the OLED device is a single-sided light-emitting device, all the light emitted from the side of the OLED device facing away from the part to be treated can irradiate the photochromic layer.

[0065] According to an embodiment of the present invention, the photochromic layer is patterned.

[0066] According to an embodiment of the present invention, under the excitation of the light of the OLED device, the photochromic layer undergoes changes in optical properties, including but not limited to one or more of color, transmittance, reflectivity, and refractive index.

[0067] In this article, the change that occurs in the photochromic layer is a change in optical properties. That is, when the color of the photochromic layer changes, it will inevitably be accompanied by a change in optical properties, such as refractive index, and there is no case where only the color changes.

[0068] According to an embodiment of the present invention, under the excitation of the light of the OLED device, the transmittance of the photochromic layer to visible light decreases from not less than 50% to less than 50%.

[0069] According to an embodiment of the present invention, under the excitation of the light of the OLED device, the transmittance of the photochromic layer to the light with the first peak wavelength decreases from not less than 50% to less than 50%, while the transmittance of the photochromic layer to the light in other wavelength bands remains basically unchanged.

[0070] According to an embodiment of the present invention, under the excitation of the light of the OLED device, the reflectivity of the photochromic layer to visible light increases from not higher than 20% to higher than 20%.

[0071] According to an embodiment of the present invention, under the excitation of the light of the OLED device, the reflectivity of the photochromic layer to visible light is higher than 50%, while the reflectivity of the photochromic layer to the light in other wavelength bands remains basically unchanged.

[0072] According to an embodiment of the present invention, under the excitation of the light of the OLED device, the reflectivity of the photochromic layer to visible light is higher than 90%, while the reflectivity of the photochromic layer to the light in other wavelength bands remains basically unchanged.

[0073] According to an embodiment of the present invention, under the excitation of the light of the OLED device, the photochromic layer completely reflects at least part of the visible light to the side of the part to be treated.

[0074] According to an embodiment of the present invention, under the excitation of the light of the OLED device, the reflectivity of the photochromic layer to the light with the first peak wavelength increases from not higher than 20% to higher than 20%, while the reflectivity of the photochromic layer to the light in other wavelength bands remains basically unchanged.

[0075] According to an embodiment of the present invention, under the excitation of the light of the OLED device, the reflectivity of the photochromic layer to the light with the first peak wavelength is higher than 50%, while the reflectivity of the light in other wavelength bands remains basically unchanged.

[0076] According to an embodiment of the present invention, under the excitation of the light of the OLED device, the reflectivity of the photochromic layer to the light with the first peak wavelength is higher than 90%, while the reflectivity of the light in other wavelength bands remains basically unchanged.

[0077] According to an embodiment of the present invention, under the excitation of the light of the OLED device, the photochromic layer completely reflects at least part of the light with the first peak wavelength to the side of the part to be treated.

[0078] According to an embodiment of the present invention, when the OLED device does not emit light, the transmittance of the photochromic layer to visible light is greater than 50%.

[0079] According to an embodiment of the present invention, when the OLED device does not emit light, the transmittance of the photochromic layer to visible light is greater than 90%.

[0080] According to an embodiment of the present invention, when the OLED device does not emit light, the photochromic layer is transparent.

[0081] According to an embodiment of the present invention, it further includes a skin-friendly layer, the skin-friendly layer is arranged between the light-emitting surface and the part to be treated, and the material of the skin-friendly layer includes any one of medical silica gel, silk, cotton, linen, and gauze.

[0082] According to an embodiment of the present invention, the electric drive device includes one or more of a power supply, a charging device (preferably a wireless charging device), a Bluetooth communication device, a chip, a lead, a circuit board, a switch and other devices.

[0083] According to an embodiment of the present invention, the wearable light therapy device is a facial mask or an eye mask.

[0084] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0085] As Figure 4aThe figure shows a cross-sectional schematic diagram of a wearable phototherapy device 400, which includes a transparent substrate 401, at least one OLED light-emitting device 402 disposed on the substrate, a thin-film encapsulation layer 403 disposed on the OLED light-emitting device 402, a photochromic layer 404 disposed on the side of the transparent substrate 401 away from the OLED device 402, and an electrical driving device 405 electrically connected to the OLED device 402. The material of the transparent substrate 401 can be rigid, such as glass, plastic (such as acrylic), etc., preferably a bendable and moldable material, and more preferably a flexible material, the material of which includes but is not limited to one or more of medical silicone, colorless polyimide, polyethylene terephthalate, polyethylene naphthalate, polymethyl methacrylate, natural fabric, chemical fiber, non-woven fabric. It should be noted that when the transparent substrate 401 is a rigid material, although the substrate itself cannot be dynamically bent, the substrate can still be bent through prior molding to fit the treatment site more closely. Although the transparent substrate 401 uses opaque fabric, its transmittance can be increased by adjusting the weaving density of the fabric. The OLED light-emitting device 402 has two light-emitting surfaces 407 and 408, which emit light towards and away from the treatment site respectively. At this time, the OLED light-emitting device is a transparent device, that is, both the anode and cathode are made of transparent or semi-transparent materials. Both light-emitting surfaces 407 and 408 of the OLED light-emitting device 402 emit light with at least one peak wavelength in the range of 400 - 1400 nm, preferably between 400 - 850 nm. More preferably, the OLED light-emitting panel can emit light with two peak wavelengths simultaneously or differently, and the difference between the peak wavelengths is at least 30 nm or more, preferably 50 nm or more. Although the transparent substrate 401 can be rigid, in order to ensure the fit with the use site and the overall thinness of the wearable product, the encapsulation layer 403 is a thin-film encapsulation. A skin-friendly layer 406 can be further disposed on the thin-film encapsulation layer 403. The skin-friendly layer 406 is flexible and light-transmissive, such as medical silicone, silk, cotton, linen, gauze, etc., preferably medical silicone. In particular, in order to allow as much light emitted by the OLED light-emitting device 402 to pass through the skin-friendly layer, the skin-friendly layer preferably uses a sparse weaving method or even a hollowing-out method to allow light to pass through. The skin-friendly layer 406 can also include all or part of the front cover film 305 in the top-emitting device or the rear cover film 307 in the bottom-emitting device. The skin-friendly layer 406 can also be a part of the housing, or the entire housing is made of a skin-friendly material, such as medical silicone. The electrical driving device 405 is electrically connected to the OLED light-emitting device 402. The electrical connection includes but is not limited to one or more of thin-film metal, transparent conductive material, FPC lead. Of course, in order to improve the overall transmittance of the phototherapy device, the electrical connection is preferably transparent.The electric drive device includes one or more of devices such as, but not limited to, a power source, a charging device (preferably a wireless charging device), a Bluetooth communication device, a chip, a lead, a circuit board, a switch, etc. The power source includes a battery, and the battery can be selected from one or more of a thin-film battery, a micro battery, a button battery, a chemical battery, a lithium battery, a hydrogen battery. The electric drive device can also be wirelessly connected to an external electronic device through the Bluetooth communication device and be controlled by the external electronic device, such as switch, brightness adjustment, and zone control, etc. The external electronic device can be a device such as a smart phone, a smart watch, a tablet computer, a laptop computer, etc. Further, the external electronic device can also be combined with an application program (APP) for control.

[0086] The photochromic layer 404 is disposed on the side of the transparent substrate 401 away from the OLED device 402 and on the optical path of the outgoing light 408. The photochromic layer 404 contains a photochromic material. The photochromic layer 404 can change its optical properties, including but not limited to color, transmittance, reflectivity, refractive index, etc., under the excitation of the light 408 emitted from the light-emitting surface of the OLED device 402. The absorption spectrum of the photochromic material in the photochromic layer 404 overlaps with the emission spectrum of the OLED device 402. Although the light emitted by the OLED device 402 is also visible light, its intensity is much higher than that of the ambient light. For example, the light intensity emitted by an OLED device generally used for phototherapy is 10,000 nits and above, while the brightness in the ambient light in the same wavelength band is generally only dozens to hundreds of nits. Such light intensity is not sufficient to excite the photochromic material to change its characteristics, and it will only change its characteristics when the OLED device is lit. Preferably, under the excitation of the outgoing light of the OLED device 402, the transmittance of the photochromic layer 404 to visible light can change from high to low or even become opaque. On the one hand, the outgoing light of the OLED device 402 along the direction 408 can be prevented from being transmitted and thus avoid shining to the outside. On the other hand, the ambient light 409 from the outside can also be prevented from being transmitted. That is, from the outside, the entire wearable device 400 is dark, that is, the inside is not visible. More preferably, when not excited by the light of the OLED device, the transmittance of the photochromic layer 404 to visible light is not less than 50%, preferably not less than 70%, and more preferably not less than 80%; while when excited by the light of the OLED device 402, the transmittance to visible light is less than 50%. In some embodiments, the reflectivity of the photochromic layer 404 to the outgoing light of the OLED device 402 changes from low to high, so that the light emitted from the light-emitting surface 408 can be reflected back to the side of the person to be treated along the direction 4080, improving the utilization rate of light. Preferably, when not excited by the light of the OLED device, the reflectivity of the photochromic layer 404 is not higher than 20%, while when excited by the light of the OLED device, the reflectivity is higher than 20%, preferably higher than 50%, and more preferably higher than 70%. In another embodiment, when not excited, the transmittance of the photochromic layer 404 to visible light is not less than 50%. After being excited by the OLED device 402, the transmittance of the light in the wavelength range of the peak wavelength of the OLED device 402 and its + / -20 nm is less than 50%, while the transmittance of the light in other wavelength bands is still not less than 50%. Or, when not excited, the reflectivity of the photochromic layer 404 to visible light is not higher than 20%. After being excited by the OLED device 402, the reflectivity of the light in the wavelength range of the peak wavelength of the OLED device 402 and its + / -20 nm is higher than 20%, while the reflectivity of the light in other wavelength bands is still not higher than 20%. This can enable the outside to still see that the inside of the wearable device 400 has only changed in color (lacking the light color of the wavelength band emitted by the OLED device 402).

[0087] The "photochromic material" can be an inorganic material, including but not limited to various metal halides (AgCl, AgBr, copper-doped cadmium halides, etc.), metal oxides with transition states (such as tungsten oxide, molybdenum oxide, etc.). The photochromic material can also be an organic material, including but not limited to oxazines (such as naphthooxazines), indenonaphthopyrans, spirooxazines and their derivative variants (such as nitrogen substitution), fulgides and their variants (such as arylfulgides), diarylethenes, benzopyrans, porphyrins & phthalocyanines, naphthopyrans, and the photochromic materials that can be excited by red light include but not limited to azobenzenes and their derivatives, azoheteroarenes, azonium and its derivatives, Diazocines-bridged azobenzenes and their derivatives, dihydropyrenes and their derivatives DASA (alkylamines + barbituric / Meldrum's acid) and its variants, spiropyrans, etc. The "photochromic material" can usually be doped in the host material and then cured to form a film. The commonly used host materials can be macromolecular polymers, including but not limited to polyurethane, polycarbonate, trivex, polyethylene terephthalate, polyethylene naphthalate, etc. The host material can also be an inorganic material, such as soda-lime glass, or borosilicate glass, etc. In one embodiment, the photochromic material can be directly doped in the substrate 401, so that the entire substrate itself can have the function of a photochromic layer.

[0088] Figure 4b and 4c explains the working principle of the wearable phototherapy device 400. In combination with Figure 4a and 4b As shown, when the OLED device 402 is in the off state, since the substrate 401 is transparent, the two electrodes of the OLED device 402 are also transparent, and the thin-film encapsulation layer is also transparent. The photochromic layer also presents a transparent state without strong light excitation. Therefore, the entire wearable phototherapy device 400 is transparent to the external light 409, that is, the outside can see the inside of the device, and the inside, such as the human eye, can also see the outside. In combination with Figure 4a and 4cAs shown, when the OLED device 402 is lit under the power supply of the electric drive 405, for example, emitting red light with a peak wavelength of 600 nm, a part of the light emitted by it towards the photochromic layer will excite the photochromic layer to change. For example, its transmittance to visible light decreases. At this time, the external ambient light 409 will not be transmitted, and the OLED device 402 emits the light beam 407 that is originally directed towards the user and the light beam 4080 reflected back by the photochromic layer. In this case, the inside of the device 400 cannot be seen from the outside, and the entire device 400 is opaque to the outside.

[0089] Figure 5a As shown, a cross-sectional schematic diagram of a wearable light therapy device 500 is provided, which includes a transparent substrate 501, at least one OLED device 502 disposed on the substrate, a thin film encapsulation layer 503 disposed on the OLED device 502, a photochromic layer 504 disposed on the side of the transparent substrate 501 away from the OLED device 502, a skin-friendly layer 506, and an electric drive device 505 electrically connected to the OLED device 502. Different from Figure 4a-4c the device 400 shown, the photochromic layer 504 of the device 500 is patterned, that is, it only exists in some areas and does not exist in other areas. In the areas where the photochromic layer does not exist, there may be no substance, or some transparent materials can be filled. The patterning of the photochromic layer 504 can be completed by various methods such as printing, mask printing, and molding, which are well-known to those skilled in the art. When the OLED device 502 is lit, a part of the light will be emitted along the light beam 507 towards the treatment site, and a part of the light will be emitted along the light beam 508 towards the outside. When passing through the photochromic layer 504, its optical properties are changed (for example, its reflectivity becomes higher) and then it is re-emitted towards the treatment site along the direction of 5080. However, a part of the light beam 5081 will pass through the area without the photochromic layer 504 when it is emitted and then be emitted towards the outside. By designing the pattern of the photochromic layer 504, the light-emitting pattern observed from the outside can be realized, which can be used for decoration, warning, or publicity functions. Figure 5b As shown is a schematic diagram of the wearable device 500 when the OLED device 502 is lit. Assuming that the hollowed-out area of the photochromic layer presents the word "OLED", when the external light 509 shines on the photochromic layer, it will be reflected and not transmitted. What is observed from the outside is dark. The light of the OLED device 502 towards the use site is the superposition of 507 and 5080. At the same time, a part of the light 5081 passes through the hollowed-out area of the word "OLED" and is seen by the external observer. Therefore, at this time, the entire device can be seen from the outside to show the glowing word "OLED" against a dark background.

[0090] Figure 6aShows a cross-sectional schematic diagram of a wearable light therapy device 600, which includes a transparent substrate 601, at least one OLED device 602 disposed on the substrate, a thin film encapsulation layer 603 disposed on the OLED device 602, a skin-friendly layer 606 disposed between the thin film encapsulation layer 603 and the treatment site, an electrical driving device 605 electrically connected to the OLED device 602, a light-emitting side 607 / 608, a housing 609 for containing the above components, and a photochromic layer 604 disposed on the side of the housing 609 away from the treatment site. Figure 6b Shows a cross-sectional schematic diagram of another wearable light therapy device 610, including a transparent substrate 611, at least one OLED device 612 disposed on the substrate, a thin film encapsulation layer 613 disposed on the OLED device 612, a skin-friendly layer 616 disposed between the thin film encapsulation layer 613 and the treatment site, an electrical driving device 615 electrically connected to the OLED device 602, a light-emitting side 617 / 618. Different from the device 600, the photochromic layer 614 is disposed on the inner side of the housing 619. Although Figure 6b in the photochromic layer 614 is disposed on the lower side of the substrate 611, i.e., in contact with the substrate, it can also be disposed on the housing 619, i.e., in contact with the housing. As Figure 6a 、 6b shown, the device is more stable as a whole due to the housing, and various wearable devices such as elastic bands, buckles, and ear hooks can also be designed on the housing, which are not shown in the figure. The housings 609 and 619 are preferably flexible and at least transparent at the portions overlapping with the OLED devices 602 and 612. Preferably, the housings 609 and 619 are entirely transparent.

[0091] The above embodiments all use transparent OLED devices, that is, both the anode and cathode of the OLED are transparent or semi-transparent. The advantage of this setting is that the transmittance of the entire device is relatively high when it is not working (i.e., the OLED device is not lit). However, since it emits light from both sides, there is always some light emitted towards the outside that will be lost when encountering the photochromic layer and / or other film interfaces, so the light intensity on the treatment surface will be lost. To solve this problem, Figure 7aShows a cross-sectional schematic diagram of another wearable phototherapy device 700, which includes a transparent substrate 701, a series of single-sided light-emitting OLED devices 702 disposed on the substrate, a thin film encapsulation layer 703 disposed on the series of OLED devices 702, an electrical driving device 705 electrically connected to the series of OLED devices 702, and a photochromic layer 704 disposed on the side of the transparent substrate 701 away from the OLED devices 702. The series of OLED devices 702 can emit light of the same color or different colors. For example, some emit red light with a peak wavelength in the range of 600 - 750 nm, and some emit near-infrared light with a peak wavelength of 750 nm or above. The series of OLED devices 702 can be independently driven by the electrical driving device 705. For example, these devices can be lit in zones, or some devices can be made brighter or dimmer, etc. The series of OLED devices 702 are bottom-emitting or top-emitting single-sided light-emitting devices, and more preferably, are top-emitting devices. When the series of devices are single-sided light-emitting devices, in order to ensure that the device 700 remains semi-transparent when not lit, a certain interval needs to be left between the series of OLED devices 702. For example, the light-emitting area of the entire OLED device accounts for no more than 50% of the surface area of the entire device. In this way, although a single OLED device itself is not transparent, due to the light-transmitting gaps between them, the overall transmittance can still be maintained at 20% or more. When the series of OLED devices 702 are all top-emitting devices, although most of their light is emitted along the light-emitting direction 707, due to the optical waveguide effect, some light will always be emitted from the edge and become edge light 708, and the photochromic layer 704 is on the optical path of the edge light 708 and will be excited by it to change its optical properties, such as an increase in reflectivity, so that it is reflected back to the treatment site to become a light beam 7080. Similarly, as Figure 7bIn the wearable phototherapy device 710 shown, it includes a transparent housing 711, a series of OLED light-emitting panels 712 disposed on a substrate, an electric driving device 715 electrically connected to the OLED light-emitting panels 712, and a photochromic layer 714 disposed on the side of the housing 711 away from the light-emitting side 717. A series of OLED light-emitting panels 712 can be integrated on the transparent housing 711, and each of these series of OLED light-emitting panels 712 includes a single-sided light-emitting device (such as a top-emitting OLED device). Similarly, its edge light 718 will be reflected by the photochromic layer 704 to form a light beam 7180 that is directed towards the part to be treated. In the above two embodiments, a skin-friendly layer can be further provided, which is not shown in the figure. Similarly, in the embodiment 710, the positions of the OLED light-emitting panels 712 and the photochromic layer 714 in the housing 711 can be adjusted as needed, which will not be elaborated here. Since a single-sided emission device (such as a top-emitting or bottom-emitting device) is used, the light intensity towards the use part will be greatly increased, thus improving the phototherapy efficiency. At the same time, due to the spaced arrangement of the devices, a certain transmittance can still be maintained.

[0092] In a wearable phototherapy device 800 as shown in Figure 8 the photochromic layer 804 can be disposed on top of the thin-film encapsulation layer 803. At this time, the OLED device 802 is still a transparent device with double-sided light transmission. When the electric drive 805 supplies power to it, there is outgoing light 807 on the side towards the transparent substrate 801, and there is outgoing light 808 on the side towards the thin-film encapsulation layer 803. The photochromic layer 804 is on the optical path of the outgoing light 808 and is excited by it to undergo a change in optical properties, so that the outgoing light 808 is not transmitted to the outside, and even can be reflected back to the substrate side to form a reflected light 8080. Since the thin-film encapsulation layer 803 usually uses an inorganic / organic / inorganic sandwich structure, the photochromic material can also be doped in at least one organic layer of the thin-film encapsulation layer 803, so that the thin-film encapsulation layer 803 contains the photochromic layer 804. Alternatively, the main material of the photochromic layer 804 can be selected as the ink for the organic layer in the thin-film encapsulation layer, so that the photochromic layer 804 has a certain encapsulation effect after curing. Similarly, a series of OLED devices can be disposed on the transparent substrate. This series of OLED devices can be transparent devices or bottom-emitting devices. This series of OLED devices share a thin-film encapsulation layer, and a photochromic layer is disposed on top of the thin-film encapsulation layer. Or a series of OLED light-emitting panels can be further disposed on a housing, and a photochromic layer is disposed on top of the thin-film encapsulation layer of this series of panels. The specific implementation process is as described above and will not be elaborated here. In this embodiment, a skin-friendly layer 806 can similarly be provided.

[0093] The wearable phototherapy device disclosed in the present application includes at least one OLED light-emitting panel, and a patternable photochromic layer is provided on one side of the OLED panel. The photochromic layer can adjust its transparency according to whether the OLED device emits light or not under the excitation of its own emitted light, so that it is in a transparent state when the light source is turned off, and in an opaque or even reflective state when the light source is turned on. Not only can the outside not see the light emitted from the inside, but also a part of the reflected light can return to the treatment site or form a pattern, which not only improves the utilization rate of light but also enhances the aesthetics during wearing.

[0094] It should be understood that the various embodiments described herein are only examples and are not intended to limit the scope of the present invention. Therefore, as will be apparent to those skilled in the art, the claimed invention may include variations of the specific and preferred embodiments described herein. Many of the materials and structures described herein may be replaced with other materials and structures without departing from the spirit of the present invention. It should be understood that the various theories as to why the present invention works are not intended to be limiting.

Claims

1. A wearable phototherapy device, comprising: at least one OLED light-emitting panel, a photochromic layer, and an electric drive device; The OLED light-emitting panel includes a transparent substrate and at least one OLED device; The OLED device includes a light-emitting surface that emits light with a first peak wavelength between 400-1400 nm towards the treatment site; The OLED device also emits light towards the side away from the treatment site, and at least part of the light on the side away from the treatment site irradiates the photochromic layer; The OLED device is electrically connected to the electric drive device.

2. The wearable phototherapy device according to claim 1, wherein the OLED device emits light with two peak wavelengths that differ by at least 30 nm from each other.

3. The wearable phototherapy device according to claim 1, wherein the OLED light-emitting panel includes at least one transparent OLED device.

4. The wearable phototherapy device according to claim 1, wherein the OLED light-emitting panel includes at least one single-sided light-emitting OLED device; Preferably, the multiple OLED devices included in the OLED light-emitting panel are all single-sided light-emitting OLED devices.

5. The wearable phototherapy device according to claim 1, wherein a thin film encapsulation layer is provided on the OLED device, and the substrate and / or the thin film encapsulation layer contains a photochromic material; Preferably, the photochromic material is doped in the thin film encapsulation layer.

6. The wearable phototherapy device according to claim 1, wherein the photochromic layer is patterned.

7. The wearable phototherapy device according to claim 1, when the photochromic layer is excited by the light of the OLED device, the transmittance of the light with the first peak wavelength decreases from not less than 50% to less than 50%, or the reflectance of the light with the first peak wavelength increases from not more than 20% to more than 20%.

8. The wearable phototherapy device according to claim 1, when the photochromic layer is excited by the light of the OLED device, the transmittance of visible light decreases from not less than 50% to less than 50%, or the reflectance of visible light increases from not more than 20% to more than 20%.

9. The wearable phototherapy device according to claim 1, further comprising a skin-friendly layer provided between the light-emitting surface and the treatment site, and the material of the skin-friendly layer includes any one of medical silicone, silk, cotton, linen, and gauze.

10. The wearable phototherapy device according to any one of claims 1-9, wherein the wearable phototherapy device is a facial mask or an eye mask.

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