A breath luminescent mask and an interactive method and system based on the breath luminescent mask

Abstract

The present application belongs to the technical field of sensor, and particularly relates to a breathing light-emitting mask, and an interactive method and system based on the breathing light-emitting mask. The breathing light-emitting mask comprises a mask body, a breathing light-emitting sheet and an alternating power supply. The breathing light-emitting sheet is used for emitting light with different intensities according to the mouth breathing or nose breathing action of a user. The breathing light-emitting sheet is a multi-layer structure, comprising a substrate layer, an electrode layer, a dielectric layer, a light-emitting layer and a sensing layer. The electrode layer is an interdigital electrode printed on the substrate layer; the light-emitting layer is prepared from alternating current electroluminescent powder and is located above the electrode layer; the sensing layer is prepared from a water-absorbing gel doped with a soluble ionic compound; and the sensing layer of the breathing light-emitting sheet faces inward. The interactive method encodes the light-emitting responses of the breathing light-emitting mask to nose breathing and mouth breathing as 0 and 1, and uses a multi-bit binary signal to realize information transmission. The present application solves the problem of the limitations of the existing interactive methods based on limb actions and voice.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sensors, and particularly relates to a breathing light-emitting mask, a preparation method of a breathing light-emitting sheet, and an interactive method and system based on the breathing light-emitting mask. BACKGROUND

[0002] Human-computer interaction: refers to the information exchange process between human and computer using certain dialogue language and in certain interactive mode to complete the determined task. For the existing human-computer interaction interface, signal sensing is mainly realized through the interaction of user's gestures or voice. However, these traditional human-computer interaction modes are not friendly to certain specific groups of people who cannot clearly express their intentions through gestures, body movements or language. For example, people who have lost the ability to act due to diseases such as cerebral infarction and cerebral hemorrhage, and deaf-mute groups with movement disorders.

[0003] How to provide a new interaction mode for specific groups of people that does not depend on body movements and voice is becoming a difficult problem to be solved by those skilled in the art. SUMMARY

[0004] In order to solve the problem of the limitations of the existing interaction mode based on body movements and voice expression, the present application provides a breathing light-emitting mask, a preparation method of a breathing light-emitting sheet, and an interactive method and system based on the breathing light-emitting mask.

[0005] The present application adopts the following technical solutions:

[0006] A breathing light-emitting mask, which comprises a mask body, a breathing light-emitting sheet located at the position of the mouth and nose of the mask body, and an alternating power source for driving the breathing light-emitting sheet. The breathing light-emitting sheet is used for emitting light according to the mouth breathing or nose breathing action of the user.

[0007] The breathing light-emitting sheet is a multi-layer structure, which comprises a substrate layer, an electrode layer, a dielectric layer, a light-emitting layer, and a sensing layer. The substrate layer adopts a flexible film. The electrode layer is an interdigital electrode printed on the substrate layer; the interdigital spacing of the interdigital electrode is 400 μm or more, and the finger width of the interdigital electrode is not less than the interdigital spacing. The dielectric layer is prepared from a dielectric material and is located above the electrode layer. The light-emitting layer is prepared from alternating current electroluminescent powder and is located above the electrode layer, and contains a large number of light-emitting points arranged in a dot matrix. The sensing layer is covered above the light-emitting layer; the sensing layer is prepared from a water-absorbing gel doped with a soluble ionic compound; and one side of the sensing layer of the breathing light-emitting sheet faces inward.

[0008] As a further improvement of the present application, the substrate layer adopts any one of PET, PEN, PDMS, Parylene, PI, Ecoflex, SEBS, and TPU flexible transparent polymer film.

[0009] and / or,

[0010] The electrode layer is a metal or non-metal electrode formed by deposition and photolithography of any one of Au, Ag, Pt, silver nanowire, ITO, silver nanosheet, PSS, PEDOT, carbon nanotube, and graphene.

[0011] As a further improvement of the present application, the dielectric material selected for the dielectric layer includes any one of PVDF, PDMS, and BTO / PDMS.

[0012] As a further improvement of the present application, the light-emitting layer is obtained after coating, photolithographic alignment, exposure, and development of a light-emitting material obtained by mixing alternating current electroluminescent powder and a polymer additive in a predetermined ratio. And / or, the alternating current electroluminescent powder is selected from any one of ZnS:Cu, ZnS:Mn, and ZnS:Al. And / or, the polymer additive is selected from any one of PDMS, acrylic glue, photoresist, and Ecoflex.

[0013] As a further improvement of the present application, the hygroscopic hydrogel selected for the sensing layer includes any one of carbomer, polyacrylamide gel, polyacrylic acid sodium gel, polyacrylic acid amine gel, and polyacrylic acid glycol ester gel.

[0014] As a further improvement of the present application, the mask body includes a mask portion and a strap portion, and the mask portion is made of a transparent material in whole or in part at a position corresponding to the breathing light-emitting sheet.

[0015] The present application also includes a preparation method of a breathing light-emitting sheet, which is used to prepare the breathing light-emitting sheet in the breathing light-emitting mask as described above, and includes the following steps:

[0016] (1) The base film is cut into a predetermined size to obtain the required base layer.

[0017] (2) An electrode material with a predetermined thickness is deposited on the base layer to obtain a complete electrode layer film, and the electrode layer film is patterned by laser etching to obtain an interdigital electrode. The interdigital electrode has an interdigital distance of 400 μm or more, and the finger width of the interdigital electrode is not less than the interdigital distance.

[0018] (3) A suitable dielectric material is selected, and the dielectric material is uniformly coated on the surface of the base layer on which the electrode layer is prepared, and the required dielectric layer is obtained after drying.

[0019] (4) The electroluminescent powder is mixed with the polymer additive in a predetermined ratio to obtain a light-emitting layer material, the light-emitting material is uniformly coated on the surface of the dielectric layer, and then the light-emitting layer material is dried to obtain the required light-emitting layer.

[0020] (5) scraping the surface of the light-emitting layer generated in the above step with a wet hygroscopic hydrogel doped with a soluble ionic compound, and then drying by nitrogen blowing to generate a sensing layer, thereby obtaining the desired breath-induced light-emitting sheet.

[0021] The present application also includes an interaction method based on the breath-induced light-emitting mask, which comprises the following steps:

[0022] S1: a user wears the breath-induced light-emitting mask as described above, and the breath-induced light-emitting mask is used to emit light according to the breathing action of the user.

[0023] The breath-induced light-emitting mask in the present application emits light at a high intensity when the user breathes through the mouth, emits light at a low intensity when the user breathes through the nose, and does not emit light in a non-breathing state.

[0024] S2: the light-emitting intensity of the breath-induced light-emitting mask is collected in real time to generate a light intensity signal I(t).

[0025] S3: filtering the light intensity signal I(t) with a high-pass filter according to a preset noise threshold I min .

[0026] S4: converting the filtered light intensity signal I(t) into a discrete binary signal D, the process being as follows:

[0027] S41: extracting the breathing wave corresponding to each breathing action in the light intensity signal, and obtaining the signal peak value of each breathing wave.

[0028] S42: identifying each breathing action as mouth breathing or nose breathing according to the signal peak value of the breathing wave and the intensity interval of each breathing action.

[0029] S43: encoding nose breathing and mouth breathing as 0 and 1, thereby obtaining the desired binary signal D.

[0030] S5: taking the state value of a specified length in the continuous binary signal D as a signal vector by the sliding window method.

[0031] S6: converting each signal vector into a corresponding character according to a preset encoding rule.

[0032] S7: outputting the sentence composed of each continuous character as interaction information.

[0033] As a further improvement of the present application, in step S3, the noise threshold I min is 200 a.u; the intensity interval a of nose breathing satisfies: 200

[0034] As a further improvement of the present application, in step S5, the length of the signal vector is set to 5, and the signal capacity is 32; 32 5-bit binary codes are used to represent 32 characters.

[0035] The present application also includes a new type of human-computer interaction system based on the breath luminescent mask, which uses the breath luminescent mask-based interaction method as described above to realize information interaction according to the mouth breathing action of the user. The interaction system includes a breath luminescent mask, a light signal acquisition component, a signal decoding module, and an information output module.

[0036] The light signal acquisition component is used to acquire the luminescent response of the breath luminescent sheet in the breath luminescent mask in real time and extract the corresponding light intensity signal I(t). The signal decoding module is used to obtain the light intensity signal I(t) extracted by the light signal acquisition component and decode the light intensity signal into corresponding interaction information using the method of steps S3-S6 in the breath luminescent mask-based interaction method. The information output module is used to output the interaction information in any way.

[0037] The technical solution provided by the present application has the following beneficial effects:

[0038] The breath luminescent mask provided by the present application integrates a breath luminescent sheet designed using the principles of hygroscopic hydrogel and alternating current electroluminescence, thereby realizing a sensitive luminescent response to the breathing action, converting the breathing action into a luminescent signal, and combining the light signal to dynamically monitor multiple physiological indicators contained in the breathing action.

[0039] Based on the provided breath luminescent mask, the present application further develops a new type of human-computer interaction working logic that uses the breath luminescent mask to distinguish between nasal breathing and mouth breathing and realizes information interaction based on the encoding and decoding of the distinguishing results. This new interaction method can perform information interaction based on the breathing action of the user and does not rely on traditional body movements and voice information, so it can have wide application prospects in the fields of disabled person interaction, virtual reality, intelligent robots, and Internet of Things.

[0040] The breath luminescent intelligent mask provided by the present application has a simple structure, high luminescent brightness, low manufacturing cost, and is easy to mass-produce; and can be applied to the fields of breath monitoring and human-computer interaction. The new type of interaction method based on the breath luminescent mask provided by the present application has the advantages of high stability and simple and sensitive operation, and is suitable for further popularization and application. BRIEF DESCRIPTION OF DRAWINGS

[0041] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0042] Figure 1Structure diagram of the breath luminescence mask provided for the embodiment 1 of the present application.

[0043] Figure 2 Structure diagram of the breath luminescence sheet provided for the embodiment 1 of the present application.

[0044] Figure 3 Structure diagram of the breath luminescence sheet provided for the embodiment 1 of the present application.

[0045] Figure 4 Structure diagram of the breath luminescence sheet provided for the embodiment 1 of the present application.

[0046] Figure 5 Sample picture of the breath luminescence mask provided for the embodiment 1 of the present application.

[0047] Figure 6 Step flow chart of the breath luminescence mask-based interactive method provided for the embodiment 3 of the present application.

[0048] Figure 7 Luminescence response of the breath luminescence mask with two different luminescence colors to the breath action in the performance test experiment.

[0049] Figure 8 Luminescence intensity signal diagram of the breath luminescence mask under different breath frequencies in the performance test experiment.

[0050] Figure 9 Dynamic monitoring signal diagram of the breath luminescence mask within 5 min in the performance test experiment.

[0051] Figure 10 Luminescence intensity comparison of the mouth breath and the nose breath action in the performance test experiment.

[0052] Figure 11 Distribution diagram of the luminescence intensity peak value of 50 nose breaths and 50 mouth breaths in the performance test experiment.

[0053] Figure 12 Detection signal diagram corresponding to the breath action in the interactive experiment.

[0054] Figure 13 Interactive information decoded according to the breath action in the interactive experiment.

[0055] The figure is marked as:

[0056] 1, mask body; 2, breath luminescence sheet; 3, alternating power supply; 21, base layer; 22, electrode layer; 23, dielectric layer; 24, luminescence layer; 25, sensing layer. DETAILED DESCRIPTION

[0057] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0058] Embodiment 1

[0059] The present embodiment provides a breathing light-emitting mask, as shown in Figure 1 which comprises a mask body 1, a breathing light-emitting sheet 2 located at the mouth-nose position of the mask body 1, and an alternating power source 3 for driving the breathing light-emitting sheet 2; the breathing light-emitting sheet 2 is used for emitting light according to the mouth breathing or nose breathing action of the user.

[0060] The breathing light-emitting sheet 2 is a multi-layer structure, as shown in Figure 2 and Figure 3 which comprises a substrate layer 21, an electrode layer 22, a dielectric layer 23, a light-emitting layer 24, and a sensing layer 25. The substrate layer 21 is a flexible film. The electrode layer 22 is an interdigital electrode printed on the substrate layer 21; the interdigital electrode has an interdigital spacing of 400 μm or more, and the finger width of the interdigital electrode is not less than the interdigital spacing. The dielectric layer 23 is made of a dielectric material and is located above the electrode layer 22. The light-emitting layer 24 is made of alternating current electroluminescent powder and is located above the electrode layer 22, and the light-emitting layer 24 contains a large number of light-emitting points arranged in a dot matrix. The sensing layer 25 is covered on the light-emitting layer 24; the sensing layer 25 is made of a water-absorbing gel doped with a soluble ionic compound; one side of the sensing layer 25 of the breathing light-emitting sheet 2 faces inward.

[0061] In the actual application, the alternative flexible transparent polymer materials include PET, PEN, PDMS, Parylene, PI, Ecoflex, SEBS, TPU, etc. In the present embodiment, the electrode layer 22 adopts a metal or non-metal electrode generated by deposition and photolithography. The alternative materials of the electrode layer 22 include Au, Ag, Pt, silver nanowire, ITO, silver nanoplate, PSS, PEDOT, carbon nanotube, graphene, etc. In the preparation of the electrode layer 22, the deposition + photolithography process can be adopted, that is, a complete conductive layer is first generated on the substrate layer 21 by the deposition process, and then the patterned electrode layer 22 is obtained by removing part of the conductive layer by the photolithography process.

[0062] The dielectric layer 23 is located between the electrode layer 22 and the light-emitting layer 24, which prevents the power supply from causing electrical breakdown to the light-emitting layer 24 and generates uniform electric field distribution between the electrode layer 22 and the light-emitting layer 24. The optional dielectric material includes a single flexible polymer matrix or a flexible polymer matrix doped with high dielectric powder, such as PVDF, PDMS, BTO / PDMS. In this embodiment, the conductivity of the sensing layer 25 changes under different humidity conditions, which in turn changes the electric field distribution at different positions near the electrode layer 22 in the breath light-emitting sheet 2. Finally, the conductive bridge formed by the humidity sensing is driven by alternating current, which in turn drives the light-emitting layer 24 to emit light.

[0063] In this embodiment, the light-emitting layer 24 is essentially composed of a large number of particles of alternating current electroluminescent material that can emit light under electric field excitation, which is equivalent to a "lattice" light source composed of multiple light-emitting units, and each light-emitting point is equivalent to each pixel point in the LED display screen. In the preparation process, the alternating current electroluminescent powder and the polymer additive are mixed according to the predetermined ratio to obtain the light-emitting material, and then the light-emitting material is uniformly coated on the dielectric layer 23, and after drying, the required light-emitting layer 24 is obtained. In addition, if the light-emitting layer 24 needs to present a special pattern, the position distribution of each light-emitting point in the light-emitting layer 24 can be adjusted through the processes of photoetching alignment, exposure, and development, and then the required light-emitting layer 24 pattern is obtained.

[0064] In addition to the image design of the light-emitting layer 24, the light-emitting color of the breath light-emitting sheet 2 can also be customized as needed. In actual application, the alternating current electroluminescent powder used in the light-emitting layer 24 of this embodiment selects various materials that can produce visible light of different wavelengths (i.e. different colors), including ZnS with different Cu element doping ratios, such as ZnS:Cu producing 460 nm blue-green visible light, ZnS:Cu producing 510 nm green visible light, and ZnS:Mn producing 590 nm orange visible light. Of course, different types of alternating current electroluminescent powder can also be mixed to produce special color composite light. The polymer additive in the light-emitting material used in this embodiment is mainly used to achieve uniform dispersion, surface combination and patterning of the alternating current electroluminescent powder. Therefore, the polymer additive used is selected from various materials such as PDMS, acrylic glue, photoresist, Ecoflex, etc.

[0065] In this embodiment, the alternating current electroluminescent powder used in the light-emitting layer 24 is mainly composed of two components: a matrix material and a light-emitting center material. The matrix material generally needs to meet the following characteristics: (1) a sufficiently large band gap to allow the light-emitting center to emit visible light; (2) the ability to withstand high electric field strength without being broken down; (3) insulation below the turn-on voltage; (4) the ability to be doped with elements that serve as the light-emitting center material, enabling it to achieve high brightness emission at a specific wavelength; (5) the ability to withstand sintering temperatures close to 600°C; (6) the ability to provide a medium for efficient transmission of high-energy electrons (>2eV); and (7) the ability to allow thin film deposition of other materials. The light-emitting center material, on the other hand, needs to meet the following characteristics: (1) the ability to emit light at the desired wavelength; (2) a sufficiently large cross-section for collisional excitation; (3) the ability to be doped into the matrix material; and (4) sufficient stability in a strong electric field.

[0066] Specifically, most of the matrix materials that meet the aforementioned requirements are compounds in the broad group I-VI. Examples include ZnS, ZnSe, CaS, SrS, some ternary sulfides such as CaGaS4 and SrGa2S4, and some oxides such as Zn2Si1-xCe. x The luminescent center materials are typically derived from transition metals such as Mn, Cu, and Cr, or rare earth metals such as cerium, praseodymium, europium, and terbium. Alternative ACEL materials include ZnS:Mn; SrS:Ce; Srs:Cu; SrS:Ag / Cu; rare earth-doped ZnS; some thioglycolates; other alkali metal sulfides; and some oxides.

[0067] In the breathing luminescent sheet 2 of this embodiment, the function of the sensing layer 25 is to absorb water vapor in a high-humidity environment, thereby changing from a high-resistance state to a low-resistance state. Furthermore, to enable online monitoring of the breathing luminescent sheet 2, the electrical properties of the sensing layer 25 under dry and humid conditions must be reversible. Based on this specific requirement, the technicians of this embodiment prepared a suitable sensing layer 25 using a hygroscopic hydrogel doped with soluble ionic compounds. Initially, the sensing layer is in a dry state, and the sensing layer 25 is an insulator. When the sensing layer 25 is in a high-humidity state, the hygroscopic hydrogel absorbs water vapor and condenses. The condensed water molecules dissolve the doped ionic compounds, making the sensing layer 25 conductive. When the sensing layer 25 returns to dryness, the ionic compounds recrystallize, and the sensing layer 25 returns to an insulating state.

[0068] In practical applications, the hygroscopic hydrogels used to prepare the sensing layer 25 include, but are not limited to, various superabsorbent polymers (SAPs) such as carbomer, polyacrylamide gel, sodium polyacrylate gel, polyacrylamide gel, and polyethylene glycol ester gel, as well as mixtures of SAP and binders such as polyethylene glycol. The soluble ionic compounds doped into the hygroscopic hydrogel can be selected from a series of inorganic or organic salts that have a neutral pH and are non-toxic, green, and environmentally friendly, such as sodium chloride and potassium chloride.

[0069] The breathing light-emitting sheet 2 provided in this embodiment is a novel device that combines the humidity response of a hygroscopic hydrogel with an AC electroluminescent material. It utilizes the change in the moisture absorption of the hygroscopic hydrogel material under different humidity conditions to alter the electric field around the AC electroluminescent material, thereby affecting the luminescence state of the light-emitting layer 24, thus enabling the detection and visualization of humidity conditions. Specifically, the following describes... Figure 4 The working principle of the breathing light-emitting sheet 2 provided in this embodiment will be described in detail:

[0070] In the breathing light-emitting sheet 2 provided in this embodiment, the electrode layer 22 is in the shape of interdigitated electrodes, and the channel width between the interdigitated electrodes is relatively wide, reaching more than 400 μm. The electrodes are equivalent to conductive plates, and the light-emitting layer 24 and the dielectric layer 23 are both dielectric materials. Therefore, the dielectric layer 23 and the light-emitting layer 24 at the channel between adjacent interdigitated electrodes form a lateral equivalent capacitance C0, while the dielectric material above the two interdigitated electrodes and the light-emitting layer 24 form longitudinal equivalent capacitances C1 and C2, and the equivalent resistance of the sensing layer 25 is R0.

[0071] When the breathing light-emitting sheet 2 provided in this embodiment is in a dry environment, the conductivity of the sensing layer 25 is poor, that is, the resistance R0 is in a high-resistance state. At this time, the equivalent circuit of the entire device is as follows: Figure 4 The upper half is shown. The excitation electric field generated by alternating power supply 3 is mainly concentrated in the channel; however, due to the large width of the channel, from... Figure 4 As can be seen from the electric field distribution diagram, the electric fields at the electrodes and channels are relatively weak. Since the light-emitting points in the light-emitting layer 24 are essentially elements excited by an electric field, and the electric field strength at the electrodes and channels in the electrode layer 22 cannot reach the excitation electric field threshold of the light-emitting points, the light-emitting layer 24 of the breathing light-emitting sheet 2 will not emit light at this time.

[0072] When the breathing light-emitting sheet 2 provided in this embodiment is in a humid environment, the hygroscopic hydrogel in the sensing layer 25 increases its conductivity through ionic conduction after absorbing water molecules, and the resistance R0 changes from a high-resistance state to a low-resistance state. At this time, the equivalent circuit of the entire device is as follows: Figure 4 The lower half is shown. The excitation electric field generated by the alternating power supply 3 is mainly concentrated at capacitors C1 and C2, i.e., between the induction layer 25 and the electrodes. From...Figure 4 It can also be seen in the electric field distribution diagram in the wet state that the electric field at the electrode is much higher than that at the channel. Correspondingly, the electric field intensity at the electrode exceeds the threshold required for electroluminescence, so the light-emitting points above the electrode will be excited and emit light. The electric field intensity at the channel is correspondingly weakened and is lower than the excitation field of the light-emitting points, so the light-emitting points above the channel cannot be excited and will not emit light.

[0073] It can be seen that in the breathing light-emitting sheet 2 provided in the embodiment, when the sensing layer 25 changes from a dry state to a wet state, the electric field distribution at the corresponding electrode and the channel in the electrode layer 22 changes, causing the light-emitting points at the electrode to emit light. That is, the light-emitting state of the breathing light-emitting sheet 2 can quickly respond to the ambient humidity.

[0074] In the process of user breathing, each exhalation action will expel gas from the lungs through the mouth to the corresponding breathing light-emitting sheet 2 on the mask, and the inhalation action will inhale the gas in the environment into the mouth. In combination with the wearing method of the mask and the installation method of the breathing light-emitting sheet 2, it can be known that each exhalation action of the user will “spray” the humid air to the sensing layer 25 of the breathing light-emitting sheet 2, which will trigger the breathing light-emitting sheet 2 to emit light at this time. In the inhalation action and non-breathing state, the sensing layer 25 of the breathing light-emitting sheet 2 will not contact the humid gas, so the breathing light-emitting sheet 2 will not emit light.

[0075] In addition, the light-emitting layer 24 in the embodiment is essentially composed of a large number of light-emitting points, so the greater the humidity of the humid gas contacted by the sensing layer 25, the greater the humid area of the sensing layer 25. The increase of the humid area of the sensing layer 25 leads to the increase of the light-emitting area of the light-emitting layer 24, and ultimately leads to the higher light intensity of the breathing light-emitting sheet 2 when emitting light. In the process of human respiration, the gas is expelled from the mouth in oral respiration and from the nasal cavity in nasal respiration, and the mouth contains a large amount of saliva and other secretions, so the humidity of the gas expelled in oral respiration is higher than that in nasal respiration. Therefore, the light-emitting intensity of the breathing light-emitting sheet 2 in the breathing light-emitting mask provided in the embodiment is higher in oral respiration than in nasal respiration.

[0076] The breathing light-emitting mask provided in the embodiment can visually monitor the breathing action of the user through the light-emitting state of the breathing light-emitting sheet 2, can distinguish the oral respiration and nasal respiration actions according to the light-emitting intensity, and can use the light-emitting frequency and light-emitting time length of the breathing light-emitting sheet 2 to reflect the physiological indicators such as the breathing frequency and the vital capacity of the user. This has a broad application prospect in the field of breathing monitoring.

[0077] The mask body 1 provided by the embodiment includes a mask part and a band part. In order to make the light-emitting state of the breathing light-emitting sheet 2 more obvious, the mask part or the local part corresponding to the breathing light-emitting sheet 2 can be made of transparent material. The breathing light-emitting sheet 2 of the breathing light-emitting mask needs to be driven by the alternating power supply 3 to respond to the ambient humidity. In actual application, a rechargeable battery and a driving circuit can be used to provide the required alternating power supply 3 and be electrically connected with the breathing light-emitting sheet 2. A power cable can also be directly connected to the mains, and then the mains is converted into the working voltage and frequency required by the breathing light-emitting sheet 2 through a driving circuit or a converter.

[0078] It should be particularly emphasized that the mask is only a carrier for the monitoring task of the breathing light-emitting sheet 2 to realize differential light-emitting according to different breathing actions. The mask body 1 in the breathing light-emitting mask of the embodiment is not limited to a conventional medical mask. In other embodiments, as shown in FIG. 1B, the mask body 1 can also be replaced by a mask, a helmet, a face mask or other similar head-wearable products. These still belong to the protection scope of the technical scheme of the present application. Figure 5

[0079] Embodiment 2

[0080] The embodiment provides a preparation method of the breathing light-emitting sheet 2, which is used to prepare the breathing light-emitting sheet 2 in the breathing light-emitting mask in the embodiment 1. The breathing light-emitting sheet 2 is essentially a visual humidity sensor. The preparation method of the special sensor product includes the following steps:

[0081] (1) The base film is cut into a predetermined size to obtain the required base layer 21.

[0082] (2) The electrode material with a predetermined thickness is deposited on the base layer 21 to obtain a complete electrode layer 22 film. The electrode layer 22 film is patterned by laser etching to obtain an interdigital electrode. The interdigital spacing of the interdigital electrode is greater than or equal to 400 μm, and the finger width of the interdigital electrode is not less than the interdigital spacing.

[0083] (3) The dielectric material is selected and uniformly coated on the surface of the base layer 21 on which the electrode layer 22 is prepared. After drying, the required dielectric layer 23 is obtained.

[0084] (4) The electroluminescent powder is mixed with the polymer additive in proportion to obtain the light-emitting layer 24 material. The light-emitting material is uniformly coated on the surface of the dielectric layer 23, and then the light-emitting layer 24 material is dried to obtain the required light-emitting layer 24.

[0085] In actual application, the light-emitting layer 24 can be patterned by photolithography or printing process to meet the customization needs of the light-emitting pattern. ​

[0086] (5) The surface of the light-emitting layer 24 generated in the above step is scraped with a wet hygroscopic hydrogel doped with a soluble ionic compound, and then dried by nitrogen blowing to generate a sensing layer 25, thereby obtaining the required breath light-emitting mask 2.

[0087] Embodiment 3

[0088] The present embodiment provides an interaction method based on a breath light-emitting mask, as shown in the following steps: Figure 6

[0089] S1: A user wears a breath light-emitting mask as in Embodiment 1, which is used to emit light according to the user's breathing action.

[0090] The breath light-emitting mask in the present embodiment emits light at a high intensity when the user breathes through the mouth, emits light at a low intensity when the user breathes through the nose, and does not emit light in a non-breathing state.

[0091] S2: The light intensity of the breath light-emitting mask is collected in real time to generate a light intensity signal I(t).

[0092] S3: According to a preset noise threshold I min , the light intensity signal I(t) is filtered using a high-pass filter. In the monitoring process of the breathing action, the lower limit of the light intensity of the light-emitting state generated by different breathing actions can be tested through experiments, and in the present embodiment, the lower limit of the light intensity of the breath light-emitting mask corresponding to the breathing action is taken as the noise threshold, and the signal below the noise threshold is taken as the environmental noise. In the present embodiment, the noise threshold I min measured through experiments is 200 a.u.

[0093] S4: The filtered light intensity signal I(t) is converted into a discrete binary signal D, as follows:

[0094] S41: Extract the breathing wave corresponding to each breathing action in the light intensity signal, and obtain the signal peak value of each breathing wave.

[0095] When the user emits a breathing action each time, the light intensity signal I(t) continuously rises in the exhalation process, and continuously falls in the inhalation process, and then remains flat at a low intensity after the breathing action ends. By analyzing the light intensity signal I(t), the breathing wave corresponding to each breathing action of the user can be obtained. The signal peak value of the breathing wave is related to the humidity of the gas exhaled by the user in the breathing action.

[0096] S42: According to the signal peak value of the breathing wave and the intensity interval of each breathing action, each breathing action is identified as mouth breathing or nose breathing.

[0097] ​After a large amount of data statistics and analysis, the technical personnel found that the signal peak of the light emission response generated by the nasal breathing action is generally between 200-1000, while the signal peak of the light emission response generated by the oral breathing action is above 1000. Therefore, in each embodiment, the type of breathing action is determined according to the interval to which the peak value of each extracted breath belongs. Specifically,

[0098] (1) When the peak value of the current breathing action belongs to interval a, it is determined that the current breathing action belongs to nasal breathing.

[0099] (2) When the peak value of the current breathing action belongs to interval b, it is determined that the current breathing action belongs to oral breathing.

[0100] Wherein, the intensity interval a of nasal breathing is (200, 1000]; the intensity interval b of oral breathing action is (1000, +∞) or (1000, 2000).

[0101] S43: Encode the nasal breathing and oral breathing as 0 and 1, and then obtain the required binary signal D.

[0102] S5: Use the sliding window method to take the state value of a specified length in the continuous binary signal D as a signal vector. In this embodiment, the length of the signal vector is set to 5, and the signal capacity is 32. That is, 32 five-bit binary codes are used to represent 32 characters.

[0103] S6: Convert each signal vector into a corresponding character according to a preset encoding rule.

[0104] In this embodiment, the peak values of the breathing waves of five consecutive breathing actions are used to generate a five-bit binary number XXXXX, where X∈{0,1}. Each five-bit binary number can be encoded as a character. For example, the signal vector "00000" represents the English letter "A", the signal vector "00001" represents the English letter "B", and so on. "11010" represents the English letter "Z". The 26 English letters only occupy 26 five-bit binary numbers, and the remaining 6 signal bits can be used to encode commonly used punctuation marks and spaces.

[0105] S7: Output the sentence composed of each continuous character as interactive information.

[0106] For example, when a certain signal length of 20 is detected, the binary signal "00111001000101101111" is first divided into 4 signal vectors

[00111] ,

[00100] ,

[01011] ,

[01111] according to the signal length, and then each signal vector is converted into the corresponding characters "H", "E", "L" and "P". After combining the characters, an interactive information with the content of HELP is obtained

[0107] Embodiment 4

[0108] The embodiment provides an interactive system based on a breathing light-emitting mask, which adopts the interactive method based on the breathing light-emitting mask in embodiment 3 to realize information interaction according to the mouth breathing action of a user. The interactive system comprises a breathing light-emitting mask, a light signal acquisition assembly, a signal decoding module, and an information output module.

[0109] The light signal acquisition assembly is used to acquire the light-emitting response of the breathing light-emitting sheet 2 in the breathing light-emitting mask in real time and extract the corresponding light intensity signal I(t). The signal decoding module is used to acquire the light intensity signal I(t) extracted by the light signal acquisition assembly and decode the light intensity signal into corresponding interactive information by using the method of steps S3-S6 in the interactive method based on the breathing light-emitting mask in embodiment 3. The information output module is used to output the interactive information by any means.

[0110] In actual application, the breathing light-emitting mask and similar products can be worn on the face of a user, and a light-sensitive probe is selected as the light signal acquisition assembly and installed near the breathing light-emitting sheet 2 in the breathing light-emitting mask. The signal decoding module is completed by using a computer program, and finally the interactive information is output through a display, a loudspeaker or other means. The breathing light-emitting mask, the light signal acquisition assembly and the signal decoding module are indispensable core components in the interactive system based on the breathing light-emitting mask provided by the embodiment, and the information output module is not a necessary component of human-computer interaction. The information output module is mainly used to help users to realize information exchange.

[0111] Performance test

[0112] In order to verify the performance of the breathing light-emitting mask and the corresponding interactive method and interactive system provided by the embodiment, samples of the breathing light-emitting mask are manufactured, the light-emitting effect of the breathing light-emitting mask under different breathing actions is tested, and a prototype of the interactive system is built to simulate and test the interactive process. The specific experimental process is as follows:

[0113] I. Preparation of the breathing light-emitting mask

[0114] The preparation process of the breathing light-emitting mask provided by the embodiment comprises the following steps:

[0115] (1) Laser engraving was performed on the PET substrate with deposited ITO electrodes to achieve patterning of the ITO electrodes. Interdigitated electrodes were prepared by laser cutting with an interdigitation distance of 400 μm and a finger width of 1000 μm.

[0116] (2) A flexible polymer matrix obtained by spin-coating barium titanate in polydimethylsiloxane (PDMS) at a mass ratio of 1:1 was obtained on the above electrode; the dielectric layer 23 was prepared by drying it in an oven at 80°C for 1 hour.

[0117] (3) A light-emitting material obtained by mixing AC electroluminescent powder and photoresist at a mass ratio of 2:1 is spin-coated on the surface of the dielectric layer 23, and patterned by ultraviolet exposure and development process to obtain the desired light-emitting layer 24.

[0118] In this experiment, ZnS:Cu and ZnS:Mn were used as alternating current electroluminescent powders to prepare two types of breathable luminescent masks that emit blue and red light, respectively. The luminescent layer 24 of the breathable luminescent mask was patterned into a heart shape.

[0119] (4) A moisture-absorbing hydrogel is scraped onto the surface of the above-mentioned light-emitting layer 24 and dried with a nitrogen gun. The resulting device is then installed on a transparent mask to obtain a sample of the desired breathing light-emitting mask.

[0120] II. Respiratory luminescence response experiment

[0121] 2.1 Luminescence Test

[0122] In the experiment, test personnel wore samples of the prepared luminescent breathing mask and breathed on them. Figure 7 As shown, this type of breathing light-emitting mask does not emit light when the user holds their breath, but displays a blue or red heart-shaped light-emitting pattern when the user breathes.

[0123] 2.2 Respiratory Rate Test

[0124] In this embodiment, an optical fiber probe is used to collect the light signal of the breathing luminescent mask in the luminescent state, and the light signal is transmitted to a spectrometer through an optical fiber. The spectrometer is then used to measure the emission spectrum of the breathing luminescent mask during the experiment.

[0125] During the respiratory rate test, the test subject sequentially performed rapid breathing, normal breathing, and slow breathing, combined with... Figure 8The experimental data of the change of the light emission intensity of the different breathing states at different frequencies collected by the respiratory light-emitting mask shows that a large number of breathing waves with different frequency distributions are generated in the spectrum at different breathing frequencies. Through data analysis, the breathing frequency during rapid breathing is about 1.06 Hz, the breathing frequency during normal breathing is about 0.34 Hz, and the breathing frequency during slow breathing is about 0.26 Hz.

[0126] 2.3, long-term respiratory monitoring

[0127] In this experiment, the test personnel wore the mask for respiratory monitoring for five minutes. The response curve generated by the spectrometer during the monitoring process is shown in Figure 9 . Analysis of the data in Figure 9 shows that the respiratory light-emitting mask provided in this embodiment can monitor the breathing process during long-term wearing. During the five-minute wearing process, the respiratory light-emitting mask can generate a stable light emission response. According to the experimental data, the test personnel breathe an average of 19 times per minute within a 5-minute monitoring period.

[0128] 2.4, light emission intensity of nasal breathing and oral breathing

[0129] In this experiment, the test personnel completed one oral breathing and one nasal breathing in turn. The response curve generated by the spectrometer is shown in Figure 10 . Analysis of the data in Figure 10 shows that the system provided in the present application can distinguish between oral breathing and nasal breathing actions by different light emission intensities. The light emission intensity change caused by oral breathing is significantly higher than that caused by nasal breathing. The analysis may be because the water vapor concentration produced by oral breathing is higher, and the contact area of the gas produced by breathing with the respiratory light-emitting sheet 2 is larger and more sufficient.

[0130] 2.5, light emission intensity statistics of nasal breathing and oral breathing

[0131] Based on Experiment 2.4, this experiment further tests and statistics the statistical data of the light emission intensity peak value of the respiratory light-emitting mask caused by 50 times of nasal breathing and 50 times of oral breathing. The statistical results are shown in Figure 11 . Analysis of the data in Figure 11 shows that the light emission intensity change caused by oral breathing is greater than that caused by nasal breathing. The peak value of the breathing wave of nasal breathing is distributed between 200-1000, while the peak value of the breathing wave of oral breathing is distributed between 1300-2000. The peak values of the breathing waves of the two do not overlap, so the light emission intensity index can be used as an index for distinguishing between nasal breathing and oral breathing in the later stage.

[0132] III. Creation and testing of interactive system

[0133] The experiment combines a respiratory luminescence mask, a fiber probe, a spectrometer and a data processing device at the rear end to build a prototype for human-computer interaction. The prototype for human-computer interaction is used to convert the user's respiratory action into corresponding text information. The data processing device adopts a conventional notebook computer, and the program written by Matlab in the notebook computer is used to determine the size of the luminescence intensity. Since the luminescence intensity range caused by mouth breathing and nose breathing is obviously different, the program is used to identify the intensity difference between the two to encode, the threshold of environmental light noise is set to 200, and the critical value of the two respiratory actions is set to 1000. The luminescence intensity peak of nose breathing is between 200-1000, which is determined as "0", and the luminescence intensity of mouth breathing is greater than 1000, which is determined as "1". Then, every five peaks are encoded, and the binary code is converted into corresponding letters to realize the display of text information.

[0134] In the preset five-bit binary signal vector and the encoding rule of the English alphabet table in the embodiment, the signal vector "00000" is used to represent the English letter "A", the signal vector "00001" is used to represent the English letter "B", and so on. The signal vector "11010" is used to represent the English letter "Z". During the interactive test process, the test personnel perform respiratory training at the front end according to the respiratory action corresponding to the word "HELP".

[0135] The spectrum of the respiratory action collected by the computer at the rear end is as shown in Figure 12 The figure includes a series of high and low staggered breathing waves. After converting each breathing wave into corresponding binary code according to the peak value of the luminescence intensity, a binary signal "00111001000101101111" with a signal length of 20 can be obtained.

[0136] Next, as shown in Figure 13 According to the preset signal length 5, the longer binary signal is decomposed into four shorter signal vectors, which are

[00111] ,

[00100] ,

[01011] and

[01111] respectively. Then, each signal vector is converted into the corresponding English letter character "H", "E", "L" and "P" respectively. After combining the characters, an interactive information with the content of HELP can be obtained.

[0137] As can be seen, the interactive system based on the respiratory luminescence mask provided by the application can realize the technical effect of information interaction by using the respiratory action of a person. This can help to solve the information exchange problem of some special personnel, and has a strong practical prospect.

[0138] The above only describes the preferred embodiments of the application and is not intended to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A breath emitting light mask, characterized in that, It comprises a mask body, a breathing light sheet located at a mouth-nose position in the mask body, and an alternating power source for driving the breathing light sheet; the breathing light sheet is used for emitting light according to the mouth breathing or nose breathing action of a user; The breathing light sheet is a multi-layer structure comprising a substrate layer, an electrode layer, a dielectric layer, a light-emitting layer, and a sensing layer; the substrate layer is a flexible film; the electrode layer is an interdigital electrode printed on the substrate layer; the interdigital electrode has an interdigital spacing of 400 μm or more, and the finger width of the interdigital electrode is not less than the interdigital spacing; the dielectric layer is made of a dielectric material and is located above the electrode layer; the light-emitting layer is made of an alternating current electroluminescent powder and is located above the electrode layer, and the light-emitting layer contains a large number of light-emitting dots arranged in a dot matrix; the sensing layer is located above the light-emitting layer; the sensing layer is made of a water-absorbing hydrogel doped with a soluble ionic compound; one side of the sensing layer of the breathing light sheet faces inward; The wet state and the electrical conductivity of the sensing layer change with the breathing action, so that the electric field distribution at the corresponding electrodes and the channels in the electrode layer changes, thereby changing the light-emitting state of the light-emitting dots; the breathing action of the user is visually monitored through the light-emitting state of the breathing light sheet.

2. The breath illuminated mask of claim 1, wherein: The substrate layer is made of any one of PET, PEN, PDMS, Parylene, PI, Ecoflex, SEBS, and TPU flexible transparent polymer films; And / or, The electrode layer is a metal or non-metal electrode made of any one of Au, Ag, Pt, silver nanowires, ITO, silver nanosheets, PSS, PEDOT, carbon nanotubes, and graphene through deposition and photolithography.

3. The breath illuminated mask of claim 1, wherein: The dielectric material selected for the dielectric layer includes any one of PVDF, PDMS, and BTO / PDMS.

4. The breath illuminated mask of claim 1, wherein: The light-emitting layer is obtained after coating, photolithography alignment, exposure, and development of a light-emitting material; the light-emitting material is obtained by mixing an alternating current electroluminescent powder and a polymer additive in a predetermined ratio; the material of the alternating current electroluminescent powder includes any one of ZnS:Cu, ZnS:Mn, and ZnS:Al; and / or the material of the polymer additive includes any one of PDMS, acrylic glue, photoresist, and Ecoflex.

5. The breath illuminated mask of claim 1, wherein: The hygroscopic hydrogel selected for the sensing layer includes any one of carbomer, polyacrylamide gel, polyacrylic acid sodium gel, polyacrylic acid amine gel, and polyacrylic acid ethylene glycol ester gel.

6. The breath illuminated mask of claim 1, wherein: The mask body comprises a mask portion and a strap portion, and all or a partial position corresponding to the breathing light sheet of the mask portion is made of a transparent material.

7. A method of preparing a breath emitting sheet, characterized by: It is used for preparing the breathing light sheet in the breathing light mask according to any one of claims 1-6, comprising the following steps: (1) cutting the base film into a predetermined size to obtain the required substrate layer; (2) depositing electrode material with a preset thickness on the substrate layer to obtain a complete electrode layer film, patterning the electrode layer film by laser etching to obtain an interdigital electrode; the interdigital electrode has an interdigital electrode spacing of 400 μm or more, and the finger width of the interdigital electrode is not less than the interdigital electrode spacing; (3) selecting a suitable dielectric material, uniformly coating the dielectric material on the surface of the substrate layer on which the electrode layer is prepared, and drying to obtain the required dielectric layer; (4) mixing electroluminescent powder and polymer additives in proportion to obtain a light-emitting layer material, uniformly coating the light-emitting layer material on the surface of the dielectric layer, and then drying the light-emitting layer material to obtain the required light-emitting layer; (5) scraping a wet hygroscopic hydrogel doped with a soluble ionic compound on the surface of the light-emitting layer generated in the previous step, and then drying by nitrogen blowing to generate a sensing layer, thereby obtaining the required breath light-emitting mask.

8. A method of interaction based on a breath emitting mask, characterized in that: It comprises the following steps: S1: a user wears the breath light-emitting mask according to any one of claims 1-6, and the breath light-emitting mask is used to emit light according to the breathing action of the user; high-intensity light emission when the user breathes through the mouth, low-intensity light emission when the user breathes through the nose, and no light emission in the non-breathing state; S2: real-time acquisition of the light intensity of the breath light-emitting mask to generate a light intensity signal I(t); S3: according to the preset noise threshold I min filtering the light intensity signal I(t) by using a high-pass filter; S4: converting the filtered light intensity signal I(t) into a discrete binary signal D, the process being as follows: S41: extracting the breathing wave corresponding to each breathing action in the light intensity signal, and obtaining the signal peak value of each breathing wave; S42: identifying each breathing action as mouth breathing or nose breathing according to the signal peak value of the breathing wave and the intensity interval of each breathing action; S43: encoding nose breathing and mouth breathing as 0 and 1 to obtain the required binary signal D; S5: using the sliding window method to take the state value of a specified length in the continuous binary signal D as a signal vector; S6: converting each signal vector into a corresponding character according to a preset encoding rule; S7: outputting the sentence composed of the continuous characters as interactive information.

9. The breath-illuminating facemask-based interaction method of claim 8, wherein: In step S3, the noise threshold I min is 200 a.u; the intensity interval a of the nasal breathing satisfies: 200 < a ≤ 1000, and the intensity interval b of the oral breathing action satisfies: b > 1000.

10. The breath-illuminating mask-based interaction method of claim 8, wherein: In step S5, the length of the signal vector is set to 5, and the signal capacity is 32; 32 five-bit binary codes are used to represent 32 characters.

11. A breath light emitting mask based interactive system, characterized by: It adopts the interactive method based on the breath light-emitting mask according to any one of claims 8-10 to realize information interaction according to the mouth breathing action of the user, and the interactive system comprises: The breath light-emitting mask according to any one of claims 1-6; A light signal acquisition component for real-time acquisition of the light-emitting response of the breath light-emitting sheet in the breath light-emitting mask and extraction of the corresponding light intensity signal I(t); and A signal decoding module for obtaining the light intensity signal I(t) extracted by the light signal acquisition component, and decoding the light intensity signal into corresponding interactive information by the method of steps S3-S6.

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