Pressure detection apparatus and electronic device

Abstract

The present application relates to the technical field of electronic devices, and provides a pressure detection apparatus and an electronic device. The pressure detection apparatus comprises: a plurality of pressure sensors; a flexible supporting layer, comprising a first surface and a second surface which are oppositely arranged in a first direction, wherein the plurality of pressure sensors are spaced apart, attached to the first surface of the flexible supporting layer, and mechanically connected at least by means of the flexible supporting layer; and one or more rigid sheets, attached to the second surface of the flexible supporting layer. Each of the one or more rigid sheets corresponds to a portion of the pressure sensors, and a projection of each rigid sheet in the first direction covers a projection of the pressure sensor corresponding thereto in the first direction. According to the present application, the flexible supporting layer, a flexible packaging layer, and a reinforcing layer are arranged, so that the pressure detection precision can be improved.

Description

Pressure detection devices and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 30, 2023, with application number 202311635296.X and application name “Pressure Detection Device and Electronic Equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of electronic equipment, and in particular to a pressure detection device and electronic equipment. Background Art

[0003] Continuous, long-term blood pressure monitoring is an effective means of preventing and treating cardiovascular disease. Current blood pressure monitoring devices primarily utilize cuff-type blood pressure monitors. These monitors measure blood pressure intermittently by closing the user's blood vessels with a cuff. The large size of the cuff also limits portability, and the pressure from the cuff can cause discomfort to the user's arm.

[0004] With the development of micro-electromechanical system (MEMS) technology, miniaturized pressure sensors have been designed and produced. Integrating miniaturized pressure sensors into wearable devices can continuously monitor the user's blood pressure over a long period of time, effectively improving the portability of blood pressure monitoring devices.

[0005] However, the accuracy of blood pressure measurement is currently low after miniaturized pressure sensors are integrated into wearable devices.

[0006] Summary of the Invention

[0007] Some embodiments of the present application provide a pressure detection device and an electronic device. The present application is introduced from multiple aspects below, and the embodiments and beneficial effects of the following aspects can be referenced to each other.

[0008] In the first aspect, the present application provides a pressure detection device, which includes a plurality of pressure sensors; a flexible support layer, the flexible support layer including a first surface and a second surface arranged opposite to each other along a first direction; a plurality of pressure sensors are attached to the first surface of the flexible support layer at intervals, and the plurality of pressure sensors are mechanically connected at least through the flexible support layer; one or more rigid sheets, one or more rigid sheets are attached to the second surface of the flexible support layer; wherein each of the one or more rigid sheets corresponds to some of the multiple pressure sensors, and the projection of each rigid sheet along the first direction covers the projection of the corresponding pressure sensor along the first direction.

[0009] According to the implementation mode of the present application, by attaching a rigid sheet on the flexible supporting layer, when the pressure detection device is subjected to pressure, the rigid sheet can constrain the bending deformation of the pressure sensor, so as to facilitate the vertical propagation of pressure in the pressure sensor, thereby improving the detection accuracy of the pressure detection device.

[0010] In some embodiments, there are multiple rigid sheets, and the multiple rigid sheets correspond one-to-one to the multiple pressure sensors.

[0011] According to the embodiment of the present application, each rigid piece constrains the bending deformation of each pressure sensor in a one-to-one correspondence, further improving the detection accuracy of the pressure detection device.

[0012] In some embodiments, there are multiple rigid sheets, and the multiple rigid sheets are spaced apart from each other.

[0013] According to the embodiment of the present application, the rigid sheet can be used to constrain the bending deformation of multiple pressure sensors while avoiding collision between adjacent rigid sheets when the pressure detection device is bent.

[0014] In some embodiments, the pressure detection device further includes a flexible encapsulation layer, which is disposed on the side of the pressure sensor layer facing away from the flexible support layer; and the projection of the flexible encapsulation layer along the first direction at least covers the projection of some of the multiple pressure sensors along the first direction.

[0015] According to the embodiment of the present application, the flexible packaging layer can be in contact with the user's wrist. During the blood pressure detection process, the pulse wave signal can be better transmitted to the pressure sensor layer through the flexible packaging layer, and the flexible packaging layer can reduce the user's discomfort when it fits with the user's wrist.

[0016] In some embodiments, the flexible encapsulation layer includes one or more flexible sheets arranged at intervals, each of the one or more flexible sheets corresponds to a portion of the multiple pressure sensors, and the projection of each flexible sheet along the first direction covers the projection of the corresponding pressure sensor along the first direction.

[0017] According to the embodiments of the present application, the flexible sheet can better protect the pressure sensor while achieving higher force transmission accuracy.

[0018] In some embodiments, there are multiple flexible sheets, and the multiple flexible sheets correspond one-to-one to the multiple pressure sensors.

[0019] In some embodiments, the flexible sheet is in contact with its corresponding pressure sensor.

[0020] According to the embodiments of the present application, the bonding between the flexible sheet and the pressure sensor enables the flexible sheet to better transmit force to the pressure sensor.

[0021] In some embodiments, the flexible supporting layer includes a flexible substrate and wires disposed on the flexible substrate, and the plurality of pressure sensors are mechanically connected via the flexible substrate and electrically connected via the wires.

[0022] In some embodiments, the plurality of pressure sensors are arranged in one or more rows, with each row comprising a plurality of pressure sensors.

[0023] According to the implementation mode of the present application, it can be used for pressure detection in different scenarios.

[0024] In some embodiments, multiple pressure sensors are arranged in multiple rows, and the pressure sensors in the same row are spaced apart along a second direction, which is perpendicular to the first direction; and the pressure sensors in two adjacent rows are staggered along a third direction, which is perpendicular to the second direction and the first direction.

[0025] According to the embodiments of the present application, the arrangement density of the pressure sensors in the row direction can be increased to improve the detection accuracy of the pressure detection device.

[0026] In some embodiments, the gap between adjacent pressure sensors in the same row is 0.1 mm to 1 mm.

[0027] According to the embodiment of the present application, the flexible support layer located in the gap between adjacent pressure sensors can be flexibly deformed so that the pressure detection device can conform to the surface of the object to be detected.

[0028] In some embodiments, the size of the pressure sensor along the first direction is less than or equal to 0.5 mm; and / or, the size of the pressure sensor in the second direction is less than or equal to 1 mm, and the second direction is perpendicular to the first direction; and / or, the size of the pressure sensor in the third direction is less than or equal to 1 mm, and the third direction is perpendicular to the second direction and perpendicular to the first direction.

[0029] According to the embodiments of the present application, the overall size of the pressure detection device can be reduced while ensuring a higher density of arranged pressure sensors, and the pressure detection accuracy can be improved.

[0030] In some embodiments, the material of the flexible substrate layer includes at least one of polydimethylsiloxane, an elastomeric compound, a flexible resin, and a flexible silicone.

[0031] In some embodiments, the pressure sensor is a MEMS pressure sensor.

[0032] According to the embodiments of the present application, the array density of the sensor array can be increased, and the detection accuracy of the pressure detection device can be further improved.

[0033] In some embodiments, the MEMS pressure sensor is a silicon-based piezoresistive sensor, a silicon-based piezoelectric sensor, or a silicon-based capacitive sensor.

[0034] In a second aspect, the present application further provides an electronic device comprising a main body and the pressure detection device of the first aspect, wherein the pressure detection device is disposed on a surface of the main body. The effects achievable in the second aspect can be referenced to the pressure detection device provided in any embodiment of the first aspect and are not further described here.

[0035] In some embodiments, the electronic device is a wearable device.

[0036] In some embodiments, the wearable device is a wrist-worn device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1A is a schematic diagram of an application scenario of a pressure detection device provided in an embodiment of the present application;

[0038] FIG1B is a schematic diagram of the AA cross section of FIG1A ;

[0039] FIG1C is a first schematic diagram of a pressure detection device in some embodiments;

[0040] FIG1D is a second schematic diagram of a pressure detection device in some embodiments;

[0041] FIG2A is a perspective view of a pressure detection device according to an embodiment of the present application;

[0042] FIG2B is a cross-sectional view taken along line BB of FIG2A ;

[0043] FIG2C is a cross-sectional diagram of the pressure detection device provided in an embodiment of the present application in cooperation with a wrist;

[0044] FIG3A is a first schematic diagram of the cooperation between the sensor array and the blood vessel provided in an embodiment of the present application;

[0045] FIG3B is a second schematic diagram of the sensor array and blood vessel provided in an embodiment of the present application;

[0046] FIG3C is a third schematic diagram of the sensor array and blood vessel provided in an embodiment of the present application;

[0047] FIG4A is a top view of a pressure sensor layer provided in an embodiment of the present application;

[0048] FIG4B is a schematic diagram of coordination between adjacent sensors provided in an embodiment of the present application;

[0049] FIG4C is a top view of FIG4B ;

[0050] FIG5A is a front view illustrating the positional relationship between the flexible sheet, the rigid sheet, and the pressure sensor provided by an embodiment of the present application;

[0051] FIG5B is a projection view of the rigid sheet and the pressure sensor in FIG5A on plane M;

[0052] FIG5C is a projection view of the flexible sheet and the pressure sensor in FIG5A on plane M;

[0053] FIG6A is a schematic cross-sectional view of a pressure sensor according to an embodiment of the present application;

[0054] FIG6B is a diagram showing the deformation state of the pressure sensor when under pressure when no rigid sheet is provided in some embodiments;

[0055] FIG6C is a diagram showing the deformation state of the pressure sensor provided by an embodiment of the present application when under pressure;

[0056] FIG7A is a second perspective view of the pressure detection device provided in an embodiment of the present application;

[0057] FIG7B is a CC cross-sectional view of FIG7A ;

[0058] FIG7C is a top view of the pressure sensor array when the pressure detection device provided by an embodiment of the present application is worn on the wrist;

[0059] FIG7D is a top view of a pressure sensor array when the pressure detection device provided by some embodiments is worn on a wrist;

[0060] FIG8A is a first cross-sectional diagram of a pressure detection device provided in an embodiment of the present application;

[0061] FIG8B is a second cross-sectional schematic diagram of the pressure detection device provided in an embodiment of the present application;

[0062] FIG9A is a third cross-sectional schematic diagram of the pressure detection device provided in an embodiment of the present application;

[0063] FIG9B is a fourth cross-sectional diagram of the pressure detection device provided in an embodiment of the present application;

[0064] FIG9C is a fifth cross-sectional schematic diagram of the pressure detection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0065] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0066] The embodiment of the present application is used to provide a pressure detection device to improve the detection accuracy. Figures 1A and 1B show exemplary application scenarios of the pressure detection device provided in the embodiment of the present application, specifically a wearable device 100 for detecting blood pressure. Among them, the wearable device 100 can be a wristband device (for example, a smart watch, a smart bracelet), an armband device (for example, a device worn on the upper arm or lower arm), a head-mounted device, a finger-worn device, an intelligent pressure sensing patch (for example, a patch that can be attached to the brachial artery or the carotid artery), etc. This application does not make specific limitations, and the following detailed description is given by taking the wearable device 100 as a wristband device as an example.

[0067] It should be noted that Figures 1A and 1B are only exemplary application scenarios of the embodiments of the present application. In other examples, the pressure detection device 10 can be applied to other devices. For example, the pressure detection device 10 can be provided on the surface of a terminal device such as an earphone or a stylus. When the user is using the terminal device, the pressure detection device 10 can detect the user pressure (for example, the pressure of the user holding the stylus, the contact pressure between the earphone and the user's ear); for example, the pressure detection device 10 can be applied to the surface of a steering wheel or operating lever of a smart cockpit to detect the user's operating pressure, so as to facilitate the smart cockpit to provide tactile feedback and inductive recognition of the user's operation; for example, the pressure detection device 10 can be provided on the surface of a robot as a tactile sensor of the robot for tactile feedback recognition of the robot; for example, the pressure detection device 10 can also be provided on the surface of a pipeline to detect the impact pressure of a fluid (for example, seawater) in the pipeline on the pipeline wall, so as to facilitate pipeline detection and defect location; in addition, the pressure detection device 10 can also be applied to other industries, aviation, aerospace fields, etc., which are not listed one by one.

[0068] Figures 1A and 1B illustrate an exemplary structure of a wearable device 100 provided in an embodiment of the present application, wherein Figure 1A is a three-dimensional structural diagram of the wearable device 100, and Figure 1B is a schematic cross-sectional view taken along line AA of Figure 1A. Furthermore, for ease of understanding, Figure 1A makes the user's wrist 200 transparent so that the location of the pressure detection device 10 can be easily observed.

[0069] 1A and 1B , the wearable device 100 provided in an embodiment of the present application may include a main body 20 and a pressure detection device 10. The main body 20 may include a watch body 21 and a wristband 22. The watch body 21 is used to implement the main functions of the wearable device 100, such as display, audio playback, communication, etc.

[0070] The wristband 22 is used to attach the watch body 21 to the user's wrist 200. The wristband 22 is deformable and can bend adaptively to the shape of the wrist 200. For example, the wristband 22 can be made of a flexible material such as knitted fabric, leather, or plastic, or it can be composed of multiple rotatably connected metal blocks, extending around the user's wrist 200 to attach the watch body 21 to the user's wrist 200. The connection between the watch body 21 and the wristband 22 can be achieved by snapping, bonding, clamping, or other methods. It can be a detachable or fixed connection, which is not limited in this application.

[0071] The pressure detection device 10 can be located on the inner surface 221 of the wristband 22. The inner surface 221 of the wristband 22 is the surface facing the user when the wearable device 100 is worn. When the user wears the wearable device 100, the pressure detection device 10 can be aligned with the blood vessels on the user's wrist 200 to detect the user's blood pressure.

[0072] In the embodiment of the present application, the wearable device 100 may be provided with one pressure detection device 10, or multiple pressure detection devices 10. Referring to FIG1B , the wearable device 100 is provided with two pressure detection devices 10. The two pressure detection devices 10 can be respectively aligned with the wrist blood vessels 201 and the wrist blood vessels 202, thereby respectively detecting the blood pressure in the blood vessels 201 and 202. The blood pressure detection results of the multiple pressure detection devices 10 can be cross-checked, thereby improving the accuracy of the blood pressure measurement.

[0073] FIG1C shows an exemplary structure of a pressure detection device 10' in some embodiments. Referring to FIG1C , the pressure detection device 10' includes a pressure sensor 111' and a rigid packaging structure 12'. During the blood pressure detection process, the surface of the pressure sensor 111' can be pressed against the surface of the user's body, thereby measuring the user's blood pressure based on the flat tension method. In this embodiment, the number of pressure sensors 111' in the pressure detection device 10' is 1, so the pressure sensor 111' needs to be precisely aligned with the user's blood vessels in order to measure the user's blood pressure. In addition, the pressure sensor 111' is a rigid package, and during the blood pressure measurement process, the pressure sensor 111' needs to be mechanically pressurized, and this mechanical pressure will cause discomfort to the user.

[0074] FIG1D shows an exemplary structure of a pressure detection device 10″ in other embodiments. Referring to FIG1D , the pressure detection device 10″ includes a sensor array composed of a plurality of pressure sensors 111″ and a rigid packaging structure 12″. In this embodiment, the pressure detection device 10″ can measure the user's blood pressure based on the oscillometric method or the flat tension method. However, the shear wall 121″ of the rigid packaging structure 12″ limits the pressure conduction of some pressure sensors 111″, affecting the blood pressure detection accuracy of the pressure detection device 10″ and giving the user a strong sense of pressure. In addition, the rigid packaging structure 12″ will limit the array density of the pressure sensors 111″. For example, the spacing between adjacent pressure sensors 111″ can only be above the millimeter level. Further reducing the array density will greatly increase the processing difficulty and processing cost, and the low-density sensor array will limit the blood pressure detection accuracy of the pressure detection device 10″.

[0075] To this end, the present embodiment provides a pressure detection device, comprising a pressure sensor layer, a flexible support layer, and a reinforcement layer stacked in sequence. The pressure sensor layer includes a pressure sensor array composed of a plurality of pressure sensors, and the flexible support layer can provide flexible support for the pressure sensor array. During the pressure (e.g., blood pressure) detection process, the flexible support layer can produce corresponding deformation according to the shape of the surface of the object being detected (e.g., the user's body), thereby achieving conformal conformity between the pressure detection device and the object being detected. Compared with the rigid packaging structure in Figures 1C and 1D, the accuracy of pressure detection can be improved, and the sense of pressure on the user can be reduced.

[0076] The pressure sensing device also includes a reinforcement layer, which may include one or more rigid sheets aligned with the pressure sensor along the stacking direction. When the pressure sensing device bends, the rigid sheets constrain lateral deformation of the pressure sensor, thereby enabling vertical pressure propagation within the pressure sensor and further improving the sensing accuracy of the pressure sensing device.

[0077] In some embodiments, the pressure sensor is a MEMS sensor. Since MEMS sensors can be extremely small, for example, below the millimeter level, the array density of the sensor array can be increased, further improving the detection accuracy of the pressure detection device.

[0078] The following introduces the first embodiment of the pressure detection device provided by this application.

[0079] Figures 2A to 2C illustrate exemplary structural diagrams of a pressure detection device 10A provided in a first embodiment of the present application. Figure 2A is a perspective view of the pressure detection device 10A, Figure 2B is a cross-sectional view taken along line BB of Figure 2A, and Figure 2C illustrates the positional relationship between the pressure detection device 10A and the user's wrist 200 when the wearable device 100 is worn on the user's wrist 200.

[0080] In the various figures herein, the X-axis represents the thickness direction of the pressure detection device 10A or the stacking direction of the various layers of the pressure detection device 10A (as a first direction), the Y-axis represents the length direction of the pressure detection device 10A (as a second direction), and the Z-axis represents the width direction of the pressure detection device 10A (as a third direction). These directions will not be emphasized separately below. The X-axis, Y-axis, and Z-axis directions may be perpendicular to each other.

[0081] For ease of understanding, the surface of each structure facing the positive X-axis is referred to herein as the front surface of the structure, and the surface of each structure facing away from the positive X-axis is referred to as the back surface of the structure. The length, width, and thickness of each component are the dimensions of the component along the Y-axis, Z-axis, and X-axis, respectively.

[0082] In addition, in the following description, the blood vessels 201 in the wrist 200 are used as an example of blood vessels to be detected. It is understood that the present application is not limited thereto. In other examples, the blood vessels to be detected can be other blood vessels in the user's body.

[0083] 2A and 2B , the pressure detection device 10A includes a flexible encapsulation layer 14A, a pressure sensor layer 11A, a flexible support layer 12A, and a reinforcement layer 13A stacked sequentially along the thickness direction. Referring to FIG2C , when the wearable device 100 is worn on a user's wrist 200, the thickness direction (i.e., the X-axis direction) of the pressure detection device 10A can be perpendicular or substantially perpendicular to the surface of the user's wrist 200, and the length direction (i.e., the Y-axis direction) of the pressure detection device 10A can be parallel or substantially parallel to the circumference direction of the user's wrist 200.

[0084] In addition, when the pressure detection device 10A is provided on the wearable device 100, the pressure detection device 10A is located between the user's wrist 200 and the wristband 22 of the wearable device 100. The flexible packaging layer 14A is located on the side of the pressure detection device 10A facing the user's wrist 200, and the reinforcing layer 13A is located on the side of the pressure detection device 10A facing the wristband 22 of the wearable device 100. For example, the reinforcing layer 13A can be fitted with the inner surface 221 of the wristband 22, and the flexible packaging layer 14A can be used to contact (e.g., fit) the user's wrist 200. During the blood pressure detection process, the pulse wave signal in the blood vessels of the wrist 200 can be transmitted to the pressure sensor layer 11A via the flexible packaging layer 14A.

[0085] The following describes in detail each layer structure of each pressure detection device 10A with reference to FIG. 2A to FIG. 2C .

[0086] First, the exemplary structure of the pressure sensor layer 11A is introduced. Referring to Figures 2A and 2B, the pressure sensor layer 11A may include a plurality of pressure sensors 111. Each pressure sensor 111 can sense the pressure acting on its measuring surface 1111 (i.e., the upper surface of the pressure sensor 111) and output a corresponding electrical signal according to the magnitude of the sensed pressure. For example, the pressure sensor 111 can output a current signal or a voltage signal that is proportional to the magnitude of the pressure. Since the pressure sensor layer 11A includes a plurality of pressure sensors 111, and it can be understood that when at least one pressure sensor 111 in the pressure sensor layer 11A is aligned with the wrist blood vessels, the pressure detection device 10A can detect the pulse wave signal in the blood vessel 201. Therefore, compared with the single pressure sensor solution in Figure 1C, the pressure detection device 10A provided in the embodiment of the present application can reduce the alignment accuracy requirements between the pressure detection device 10A and the blood vessel 201.

[0087] Furthermore, referring to Figures 2A and 2B , the multiple pressure sensors 111 can be arranged in an array. That is, the multiple pressure sensors 111 can be arranged in multiple rows and columns to form a sensor array 110A. The Y-axis direction is the row direction of the sensor array 110A, and the Z-axis direction is the column direction of the sensor array 110A. Referring to Figures 2A and 2B , each row of the sensor array 110A can include multiple pressure sensors 111.

[0088] In other examples, the sensor array 110A may also have a row and multiple columns, with each row including multiple pressure sensors 111, and each pressure sensor 111 forming a column. It will be appreciated that the number of rows and columns in the sensor array 110A can be adaptively adjusted based on demand, such as 1 row and 6 columns, 3 rows and 9 columns, 8 rows and 8 columns, etc., as long as multiple pressure sensors 111 are included in the same row, without specific limitation.

[0089] It can be understood that when the pressure detection device 10A is provided on the wearable device 100, the row direction of the sensor array 110A (i.e., the X-axis direction) can be parallel to or substantially parallel to the extension direction of the wristband 22 of the wearable device 100. In this way, when the wearable device 100 is worn on the user's wrist 200, the row direction of the sensor array 110A can be parallel to or substantially parallel to the circumference direction of the user's wrist 200.

[0090] Generally speaking, the direction in which blood vessels 201 extend is roughly parallel to the direction in which the arm extends, that is, roughly perpendicular to the circumference of wrist 200. To this end, in this embodiment, multiple pressure sensors 111 are arranged in rows along sensor array 110A. This makes it easier to ensure that at least one pressure sensor 111 in the same row is aligned with a blood vessel 201 on wrist 200 when the wearable device 100 is worn on the user's wrist 200, further reducing the alignment accuracy requirements between pressure detection device 10A and blood vessel 201.

[0091] Figures 3A to 3C illustrate the effects of different sensor array density settings on blood pressure measurement results. The array density of sensor array 110A increases from Figure 3A to Figure 3C . For ease of visualization, in Figures 3A to 3C , pressure sensors 111 aligned with blood vessel 201 are indicated by shaded rectangles, while pressure sensors 111 not aligned with blood vessel 201 are indicated by unshaded rectangles.

[0092] Referring to FIG3A , when the sensor array 110A has an array density of ρ1, one pressure sensor 111 can be aligned with the blood vessel 201 in the same row. Referring to FIG3B , when the sensor array 110A has an array density of ρ2 (ρ2 > ρ1), two pressure sensors 111 can be aligned with the blood vessel 201 in the same row. Referring to FIG3C , when the sensor array 110A has an array density of ρ3 (ρ3 > ρ2), four pressure sensors 111 can be aligned with the blood vessel 201 in the same row. In other words, the higher the array density of the sensor array 110A, the more favorable it is for reducing the alignment accuracy requirement between the pressure detection device 10A and the blood vessel 201.

[0093] To this end, in some embodiments of the present application, a MEMS sensor capable of achieving an extremely small size is used as the pressure sensor 111 to maximize the array density of the sensor array 110A. The MEMS pressure sensor may be a silicon-based piezoresistive sensor, a silicon-based piezoelectric sensor, or a silicon-based capacitive sensor, without specific limitation.

[0094] Figure 4A is a top view of pressure sensor layer 11A, illustrating an exemplary sizing arrangement for pressure sensor array 110A according to an embodiment of the present application. Referring to Figure 4A , a single pressure sensor 111 may have a length L0 of no more than 1 mm (e.g., 0.8 mm, 1 mm), a width W0 of no more than 1 mm (e.g., 0.8 mm, 1 mm), and a thickness of no more than 0.5 mm (e.g., 0.4 mm, 0.5 mm).

[0095] In addition, since the pressure sensors 111 have a certain thickness, when the wearable device 10A is worn on the user's wrist 200, interference may occur between adjacent pressure sensors 111 in the same row. For example, referring to Figures 4B and 4C (Figure 4C is a top view of Figure 4B), when the wearable device 10A is worn on the user's wrist 200, interference occurs between adjacent pressure sensors 111-1 and pressure sensor 111-2 in the same row. For ease of observation, Figures 4B and 4C illustrate the interference area between adjacent sensors 111 through the shaded portion.

[0096] To this end, in embodiments of the present application, gaps may be provided between adjacent pressure sensors 111 in the same row. For example, referring to FIG4A , the gap L1 (as a first gap) between adjacent pressure sensors 111 in the same row may be 0.1 mm to 1 mm (e.g., 0.3 mm, 1 mm). The gap W1 (as a first gap) between adjacent pressure sensors 111 in the same column may not exceed 0.1 mm to 1 mm (e.g., 0.3 mm, 1 mm).

[0097] In the embodiment of the present application, by increasing the array density of the sensor array 110A, the alignment accuracy requirement between the pressure detection device 10A and the blood vessel 201 can be reduced. Furthermore, due to the higher array density of the sensor array 110A, more pressure sensors 111 in the sensor array 110A can be aligned with the blood vessel 201, thereby improving the blood pressure measurement accuracy of the pressure detection device 10A.

[0098] The following describes an exemplary structure of the flexible supporting layer 12A. Referring to Figures 2A and 2B , the flexible supporting layer 12A includes a surface 121A (also referred to as the front surface 121A of the flexible supporting layer 12A, serving as a first surface) and a surface 122A (also referred to as the back surface 122A of the flexible supporting layer 12A, serving as a second surface) disposed opposite each other along the thickness direction. The pressure sensor layer 11A is disposed on the surface 121A, and the reinforcement layer 13A is disposed on the surface 122A.

[0099] The flexible support layer 12A is used to provide flexible support for the pressure sensor layer 11A. For example, referring to Figure 2B, when the pressure sensor 111 is subjected to downward pressure F1, the flexible support layer 12A can provide an upward force F2 on the pressure sensor 111. In addition, the flexible support layer 12A has the ability to deform. Referring to Figure 2C, when the wearable device 100 is worn on the user's wrist 200, the flexible support layer 12A can deform to match the shape of the user's wrist 200, thereby achieving conformal fit between the pressure detection device 10A and the user's wrist 200, allowing each pressure sensor 111 to conform to the surface of the user's wrist 200. In this way, the measuring surface 1111 of the pressure sensor 111 (i.e., the front of the pressure sensor 111) can be basically perpendicular to the normal direction of the surface of the user's wrist 200, which is conducive to the vertical transmission of the pulse wave signal in the blood vessel 201 to the pressure sensor 111 (i.e., transmitted to the pressure sensor 111 along the normal direction of the measuring surface 1111), thereby improving the detection accuracy of the pressure detection device 10A.

[0100] The flexible supporting layer 12A can be made of a flexible material with flexible deformation capability, such as polyimide (PI) or polyethylene terephthalate (PET), polydimethylsiloxane (PDMS), flexible resin, flexible silicone, etc., without specific limitation.

[0101] In some embodiments, the flexible supporting layer 12A is used to provide at least a mechanical connection for the multiple pressure sensors 111 of the pressure sensor layer 11A. For example, each pressure sensor 111 can be mechanically connected to the flexible supporting layer 12A. In this way, the multiple pressure sensors 111 in the pressure sensor layer 11A can be mechanically (or "physically") connected to each other via the flexible supporting layer 12A, so that the multiple pressure sensors 111 will not be physically separated from each other. The mechanical connection between each pressure sensor 111 and the flexible supporting layer 12A can include bonding, welding, clamping, etc., and is not limited in this application.

[0102] In other embodiments, the flexible supporting layer 12A is not only used to provide mechanical connection for the multiple pressure sensors 111 in the pressure sensor layer 11A, but also can provide electrical connection for the multiple pressure sensors 111. Exemplarily, the flexible supporting layer 12A includes a flexible substrate and a wire. The flexible substrate can be prepared from the above-mentioned flexible material with deformation ability (for example, PI, PET), and the wire can be formed on the flexible substrate by means of a printed circuit. The multiple pressure sensors 111 in the pressure sensor layer 11A can be mechanically connected through the flexible substrate and electrically connected through the wire. Exemplarily, the electrical connection between the electrodes of the pressure sensor 111 and the wires in the flexible supporting layer 12A can be achieved by gold wire bonding, or the electrodes of the pressure sensor 111 and the wires of the flexible supporting layer 12A can be welded by patching to achieve electrical connection between the two.

[0103] In some embodiments, the thickness of the flexible supporting layer 12A may be less than or equal to 0.5 mm, so as to ensure that the flexible supporting layer 12A has strong flexible deformation capability while meeting the support capability for the pressure sensor layer 11A.

[0104] In the embodiment of the present application, the flexible support layer 12A is set to achieve the connection of the sensor array 110A, thereby improving the relative stability of the multiple pressure sensors 111. When the wearable device 100 is worn on the wrist 200, the flexible support layer 12A can deform with the shape of the wrist 200, so that the measuring surface 1111 of the pressure sensor 111 can be basically perpendicular to the transmission direction of the pulse wave signal, which is beneficial to the vertical transmission of the pulse wave signal in the blood vessel 201 to the pressure sensor 111, thereby improving the detection accuracy of the pressure detection device 10A.

[0105] The following describes an exemplary structure of the reinforcement layer 13A. Referring to Figures 2A and 2B , the reinforcement layer 13A may include multiple rigid sheets 131A. Each rigid sheet 131A is attached to the back surface 122A of the flexible supporting layer 11, for example, by bonding or welding. The back surface of the rigid sheets 131A can be used to connect to the wristband 22.

[0106] For example, referring to Figures 2A and 2B, the number of rigid sheets 131A can be the same as the number of pressure sensors 111, and multiple rigid sheets 131A correspond one-to-one to multiple pressure sensors 111, and the projection of each rigid sheet 131A along the thickness direction covers the projection of its corresponding pressure sensor 111 along the thickness direction.

[0107] For ease of understanding, Figures 5A and 5B illustrate schematic diagrams of the positional relationship between the corresponding rigid sheet 131A and the pressure sensor 111. Figure 5A is a front view of the rigid sheet 131A and the pressure sensor 111, and Figure 5B is a projection view of the rigid sheet 131A and the pressure sensor 111 on a plane M, which is perpendicular to the thickness direction of the pressure detection device 10A.

[0108] 5A and 5B , the projection of pressure sensor 111 along the thickness direction onto plane M is projection 1110, and the projection of rigid sheet 131 along the thickness direction onto plane M is projection 1310. Projection 1110 of pressure sensor 111 has a length L0, and projection 1310 of rigid sheet 131A has a length L3, where L3>L0. Projection 1110 of pressure sensor 111 has a width W0, and projection 1310 of rigid sheet 131A has a width W3, where W3>W0. The shadow area of ​​projection 1110 of pressure sensor 111 is smaller than the shadow area of ​​projection 1310 of rigid sheet 131A, and the shadow area of ​​projection 1110 is located within the shadow area of ​​projection 1310. That is, the projection of rigid sheet 131A along the thickness direction covers the corresponding projection of pressure sensor 111 along the thickness direction.

[0109] In some embodiments, the length and width of the rigid sheet 131A may be respectively the same as the length and width of the corresponding pressure sensor 111. In other embodiments, the length of the rigid sheet 131A may be slightly greater than the length of the corresponding pressure sensor 111, and / or the width of the rigid sheet 131A may be slightly greater than the width of the corresponding pressure sensor 111.

[0110] The following describes the function of rigid sheet 131A in conjunction with Figures 6A to 6C. Figure 6A illustrates an exemplary structure of pressure sensor 111A, Figure 6B illustrates the deformation of pressure sensor 111A under pressure without rigid sheet 131A, and Figure 6C illustrates the deformation of pressure sensor 111A under pressure with rigid sheet 131A installed.

[0111] 6A and 6B , the pressure sensor 111 is an elastic structure having a certain thickness. When the measuring surface 1111 of the pressure sensor 111 is subjected to a downward pressure F1, the pressure sensor 111 will bend and deform, that is, various parts of the pressure sensor 111 will produce different degrees of lateral deformation (deformation perpendicular to the direction of action of the pressure F1). For example, the upper structure of the pressure sensor 111 produces lateral compression deformation, and the lower structure produces lateral tensile deformation. After the pressure sensor 111 produces bending deformation, the direction of the pressure F1 may no longer be parallel to the thickness direction of the pressure sensor 111, but may produce an angle θ with the thickness direction of the pressure sensor 111. That is, the pressure F1 cannot be transmitted vertically in the pressure sensor 111, thereby affecting the detection accuracy of the pressure sensor 111.

[0112] To this end, in an embodiment of the present application, the pressure detection device 10A further includes a rigid sheet 131A provided on the back of the flexible support layer 12A. The rigid sheet 131A has a large rigidity. Exemplarily, the rigidity of the rigid sheet 131A can be represented by its elastic modulus. In some embodiments, the elastic modulus of the rigid sheet 131A can be much larger than the elastic modulus of the flexible support layer 12A. For example, the elastic modulus of the rigid sheet 131A is more than 5 times the elastic modulus of the flexible support layer 12A. In other embodiments, the elastic modulus of the rigid sheet 131A can be above a set value, for example, above 50 GPa. Exemplarily, the material of the rigid sheet 131A can be a metal material (for example, steel, aluminum, etc.), hard plastic, glass, etc., which is not limited in this application.

[0113] Referring to Figure 6C, after the rigid sheet 131A is attached to the back surface 122A of the flexible supporting layer 12A, the portion of the flexible supporting layer 12A that is in contact with the rigid sheet 131A together with the rigid sheet 131A forms a constraint structure 15A for the pressure sensor 111. It will be understood that the rigidity of the constraint structure 15A is substantially the same as that of the rigid sheet 131A. Thus, when the pressure sensor 111 is subjected to pressure F1, the lower portion of the structure of the pressure sensor 111 will be constrained by the constraint structure 15A. That is, under the action of pressure F1, the lower portion of the structure of the pressure sensor 111 will hardly undergo lateral deformation, thereby causing the pressure sensor 111 as a whole to hardly undergo bending deformation. In this way, the pressure F1 can propagate along the thickness direction of the pressure sensor 111, that is, vertical propagation of the pressure F1 in the pressure sensor 111 is achieved, thereby improving the detection accuracy of the pressure sensor 111.

[0114] Furthermore, referring to Figures 2A to 2C , the plurality of rigid sheets 131A can be spaced apart from one another, i.e., there can be gaps between adjacent rigid sheets 131A. Thus, when the wearable device 100 is worn on the user's wrist 200, the portions of the flexible supporting layer 12A corresponding to the gaps can flexibly deform, allowing the pressure detection device 10A to conform to the user's wrist 200.

[0115] In some embodiments, the thickness of the rigid sheet 131A may not exceed 1 mm to reduce the overall thickness of the pressure detection device 10A. For example, the thickness of the rigid sheet 131A may be 0.8 mm, 1 mm, etc.

[0116] In the embodiment of the present application, a reinforcing layer 13A is provided on the back side 122A of the flexible supporting layer 12A, so that a lateral restraining force can be provided when the pressure sensor 111 is under pressure, thereby improving the structural stability of the pressure sensor 111 and realizing the vertical propagation of pressure in the pressure sensor 111, thereby improving the detection accuracy of blood pressure.

[0117] 2A to 2C , the flexible encapsulation layer 14A is disposed on the front side of the pressure sensor layer 11A, and its projection along the thickness direction covers the projection along the thickness direction of the pressure sensor 111 .

[0118] Flexible encapsulation layer 14A is capable of flexible deformation. Referring to FIG2C , when wearable device 100 is worn on a user's wrist 200, flexible encapsulation layer 14A is able to deform to match the shape of the user's wrist 200, thereby achieving conformal alignment between the front surface of flexible encapsulation layer 14A and the surface of the user's wrist 200. This allows the measurement surface 1111 of each pressure sensor 111 to be substantially perpendicular to the normal direction of the surface of the user's wrist 200, facilitating the vertical transmission of pulse wave signals in the blood vessels to pressure sensors 111, thereby improving the detection accuracy of the pressure detection device.

[0119] The flexible encapsulation layer 14A can be made of a flexible material with flexible deformation capability, such as PDMS, flexible resin, flexible silicone, biodegradable plastic, etc., without specific limitation.

[0120] In some embodiments, the flexible deformation capability of the flexible encapsulation layer 14A can be equal to or greater than that of the flexible support layer 12A. This allows the front surface of the flexible encapsulation layer 14A to better conform to the surface of the user's wrist 200, reducing discomfort felt by the user's wrist 200 and improving the user experience. Furthermore, the flexible encapsulation layer 12A can also protect the pressure sensor layer 11A.

[0121] In some embodiments, the flexible encapsulation layer 14A may include multiple flexible sheets 141A, each of which is attached to the front surface of the pressure sensor 111. For example, the flexible sheet 141A may be attached to the front surface of the pressure sensor 111 by encapsulation, bonding, or the like. The front surface of the flexible sheet 141A (i.e., the encapsulation surface 1411A of the flexible sheet 141A) is configured to conform to the surface of the wrist 200. In other embodiments, other structures may be provided between the flexible sheet 141A and the pressure sensor 111.

[0122] Exemplarily, referring to Figures 2A and 2B, the number of flexible sheets 141A can be the same as the number of pressure sensors 111, and multiple flexible sheets 141A correspond one-to-one to multiple pressure sensors 111, and the projection of each flexible sheet 141A along the thickness direction covers the projection of the corresponding pressure sensor 111 along the thickness direction.

[0123] For ease of understanding, Figures 5A and 5C illustrate schematic diagrams of the positional relationship between the corresponding flexible sheet 141A and the pressure sensor 111. Figure 5A is a front view of the flexible sheet 141A and the pressure sensor 111, and Figure 5C is a projection view of the flexible sheet 141A and the pressure sensor 111 on a plane M, which is perpendicular to the thickness direction of the pressure detection device 10A.

[0124] That is, referring to Figures 5A and 5C , the projection of flexible sheet 141A along the thickness direction onto plane M is projection 1410, and the projection of pressure sensor 111 along the thickness direction onto plane M is projection 1110. Projection 1110 of pressure sensor 111 has a length L0, and projection 1410 of flexible sheet 141A has a length L4, where L0>L4; projection 1110 of pressure sensor 111 has a width W0, and projection 1410 of flexible sheet 141A has a width W4, where W0>W4. The shadow area of ​​projection 1110 of pressure sensor 111 is larger than the shadow area of ​​projection 1410 of flexible sheet 141A, and the shadow area of ​​projection 1410 is located within the shadow area of ​​projection 1110, that is, the projection of pressure sensor 111 along the thickness direction covers the corresponding projection of flexible sheet 141A along the thickness direction.

[0125] In some embodiments, the length L4 and width W4 of the flexible sheet 141A may be respectively the same as the length L0 and width W0 of the corresponding pressure sensor 111. In other embodiments, the length L4 of the flexible sheet 141A may be slightly greater than the length L0 of the corresponding pressure sensor 111, and / or the width W4 of the flexible sheet 141A may be slightly greater than the width W0 of the corresponding pressure sensor 111, so that the projection of the flexible sheet 141A along the thickness direction covers the projection of the corresponding pressure sensor 111 along the thickness direction, thereby enabling the flexible sheet 141A to better protect the pressure sensor 111 while being used to transmit force.

[0126] The front surface of the flexible sheet 141A is configured to conform to the surface of the wrist 200. For example, referring to FIG2C , when the wearable device 100 is worn on the user's wrist 200, the packaging surface 1411A of the flexible sheet 141A contacts the surface of the wrist 200 and can deform accordingly with the shape of the surface of the wrist 200. For example, if the surface of the wrist 200 has a protrusion, when the packaging surface 141A is in contact with the surface of the wrist 200, a recess matching the protrusion is formed on the packaging surface 141A, so that the packaging surface 141A is approximately in contact with or completely in contact with the surface of the wrist 200. At this time, the thickness direction of the flexible sheet 141A is consistent with the thickness direction of the pressure sensor 111. When the pulse wave signal in the blood vessel 201 is transmitted to the pressure sensor 111 through the flexible sheet 141A, the pressure on the measuring surface 1111 of the pressure sensor 111 can be basically perpendicular to the normal direction of the measuring surface 1111, so as to facilitate the vertical propagation of pressure in the pressure sensor 1111 and improve the measurement accuracy of the pressure sensor 111.

[0127] Furthermore, referring to Figures 2A to 2C , the plurality of flexible sheets 141A may be spaced apart from one another, i.e., there may be gaps between adjacent flexible sheets 141A. Thus, when the wearable device 100 is worn on the user's wrist 200, the gaps between adjacent flexible sheets 141A allow the packaging surface 1411A of the flexible sheet 141A to better conform to the shape of the wrist surface, thereby allowing the pressure detection device 10A to conform to the user's wrist 200.

[0128] Furthermore, if the thickness of the flexible sheet 141A is too large, it will affect the transmission of the pulse wave signal in the blood vessel 201 to the pressure sensor 111. If the thickness of the flexible sheet 141A is too small, it will affect the protective effect of the flexible sheet 141A on the pressure sensor 111. Therefore, in some embodiments, the thickness of the flexible sheet 141A can be 1 mm to 3 mm to take into account both the force transmission effect and the protective effect of the flexible sheet 141A.

[0129] In the embodiment of the present application, the flexible packaging layer 14A is configured to fit the surface of the user's wrist 200, which can reduce the discomfort felt by the user when wearing the wearable device 100. At the same time, the flexible packaging layer 14A conforms to the surface of the user's wrist 200, so that the pressure transmitted from the flexible sheet 141A to the measuring surface 1111 of the pressure sensor 111 can be basically perpendicular to the normal direction of the surface of the user's wrist 200, thereby improving the accuracy of blood pressure detection.

[0130] In summary, the embodiment of the present application provides a pressure detection device 10A, which forms a flexible packaging structure of a pressure sensor through a flexible support layer 12A and a flexible packaging layer 14A. Therefore, during the pressure detection process, the pressure detection device 10A can be conformal to the measured surface (for example, the surface of the user's wrist 100) to improve the pressure detection accuracy.

[0131] In addition, the pressure detection device 10A further includes a rigid sheet 131A for constraining the bending deformation of the pressure sensor 111, thereby facilitating vertical transmission of pressure in the pressure sensor and further improving pressure detection accuracy.

[0132] It is understood that this embodiment is an exemplary structure of the pressure detection device, and those skilled in the art may make other modifications. For example, in some embodiments, the pressure detection device 10A may not include the flexible packaging layer 14A.

[0133] The following describes a second embodiment of the pressure detection device provided by this application. This embodiment can be based on the first embodiment. In this embodiment, pressure sensors located in adjacent rows of the pressure sensor layer are staggered to increase the arrangement density of the pressure sensors, thereby increasing the resolution of the pressure detection device.

[0134] 7A and 7B illustrate an exemplary structure of a pressure detection device 10B provided in a second embodiment of the present application, wherein FIG7A illustrates a perspective view of the pressure detection device 10B, and FIG7B illustrates a top view of a pressure sensor layer 11B.

[0135] 7A , the pressure detection device 10B includes a flexible encapsulation layer 14B, a pressure sensor layer 11B, a flexible supporting layer 12B, and a reinforcement layer 13B sequentially stacked in the thickness direction.

[0136] 7A and 7B , the pressure sensor layer 11B may include multiple pressure sensors 111. These multiple pressure sensors 111 may be arranged in multiple rows and columns, thereby forming a sensor array 110B. The Y-axis is the row direction of the sensor array 110B, and the Z-axis is the column direction of the sensor array 110B. Referring to FIG. 7A and 7B , the sensor array 110B may include multiple rows, such as a first row of sensors 1011B, a second row of sensors 1002B, ..., and an Nth row of sensors 110NB, where N is a positive integer greater than or equal to 2. Each row may include multiple pressure sensors 111.

[0137] In some embodiments, the multiple pressure sensors 111 arranged in each sensor row are substantially the same as the multiple pressure sensors 111 arranged in the row direction in the sensor array 110B of the first embodiment. For details, please refer to the relevant description in the first embodiment and will not be repeated here. For example, to prevent interference between adjacent sensors in the same row when the wearable device is worn on the user's wrist, adjacent sensors in the same row may be spaced apart by a spacing of L1.

[0138] The difference between the second embodiment of the present application and the first embodiment is that the pressure sensors 111 in two adjacent rows are staggered along the width direction (i.e., the Z-axis direction). That is, the projection of the pressure sensors 111 in each row along the width direction does not overlap with the projection of the pressure sensors 111 in the adjacent row along the width direction. For example, referring to Figure 7B, there is a gap L1 between adjacent sensors 111 in each row of sensors, and the substantial portion of the pressure sensors 111 in each row is aligned with the gap L1 of the pressure sensors 111 in the adjacent row along the width direction. In other words, the projection of the substantial portion of the pressure sensors 111 in each row along the Z-axis direction at least partially overlaps with the projection of the gap L1 of the pressure sensors 111 in the adjacent row along the Z-axis direction.

[0139] The following describes the effect of staggered placement of adjacent rows of pressure sensors 111, with reference to Figures 7C and 7D. Figure 7C shows a schematic diagram of the positional relationship between the sensor array 110B of this embodiment and the blood vessels 201 in the user's wrist when the wearable device is worn on the user's wrist. Figure 7D shows a schematic diagram of the positional relationship between the sensor array 110B' and the blood vessels 201 in the wrist in a comparative embodiment. In the comparative embodiment, adjacent rows of pressure sensors 111 are aligned.

[0140] It is understood that when the wearable device is worn on a user's wrist, the positional relationship between blood vessel 201 and pressure sensor array 110B is not specific. For example, referring to Figures 7C and 7D , when the wearable device is worn on a user's wrist, blood vessel 201 may be located at position P1 or position P2 relative to pressure sensor array 110B.

[0141] Referring to FIG. 7D , since there is a gap L1 between pressure sensors 111 in the same row, when blood vessel 201 is at position P1, blood vessel 201 is aligned with a certain row of pressure sensors 111. In this case, pressure sensing device 10B′ can detect the user's blood pressure using that row of pressure sensors 111. However, when blood vessel 201 is at position P2, blood vessel 201 may be aligned with the gaps between pressure sensors 111, resulting in no or fewer pressure sensors 111 not aligned with blood vessel 201. This affects the measurement accuracy of pressure sensing device 10B′.

[0142] In the embodiment of the present application, when the blood vessel 201 is at position P1, the blood vessel 201 can be aligned with the first row of sensors 1011B, the third row of pressure sensors, the fifth row of pressure sensors, etc. When the blood vessel 201 is at position P2, the blood vessel 201 can be aligned with the second row of sensors 1012B, the fourth row of pressure sensors, the sixth row of pressure sensors, etc. In other words, by staggering the pressure sensors 111 in adjacent rows, the arrangement density of the pressure sensors 111 in the row direction can be increased, thereby making it easier to align the blood vessel 201 with the pressure sensors 111 and reducing the alignment accuracy requirements between the pressure detection device and the blood vessel.

[0143] In some examples, the projection of the physical part of each row of pressure sensors 111 along the Z-axis direction can cover the projection of the gap L1 between adjacent rows of pressure sensors 111 along the Z-axis direction, thereby further improving the arrangement density of the pressure sensors 111 in the row direction and reducing the alignment accuracy requirements between the pressure detection device and the blood vessels.

[0144] Other details not described in this embodiment, for example, the structures of the flexible encapsulation layer 14B, the flexible supporting layer 12B and the reinforcing layer 13B can be substantially the same as the structures of the flexible encapsulation layer 14A, the flexible supporting layer 12A and the reinforcing layer 13A in the first embodiment. Therefore, reference can be made to the description of the first embodiment and no further description is given.

[0145] In summary, in this embodiment, staggering the pressure sensors 111 in adjacent sensors can increase the arrangement density of the pressure sensors 111 in the row direction, thereby increasing the resolution of the pressure detection device 10B in the row direction and reducing the alignment accuracy requirements between the pressure detection device and the blood vessels.

[0146] The following describes a third embodiment of the pressure detection device provided by the present application. This embodiment can be based on the first and second embodiments. Based on the first and second embodiments, this embodiment configures the rigid sheets in the reinforcement layer to have a non-one-to-one correspondence with the pressure sensors, i.e., at least one rigid sheet corresponds to multiple pressure sensors. The number of rigid sheets in the reinforcement layer is smaller than that in the first and second embodiments, which reduces processing difficulty and cost while achieving support and reinforcement for the pressure sensors.

[0147] Figures 8A and 8B illustrate exemplary structures of a pressure detection device 10C provided in a third embodiment of the present application. Figure 8A illustrates exemplary structure 1 of the pressure detection device 10C provided in this embodiment, and Figure 8B illustrates exemplary structure 2 of the pressure detection device 10C provided in this embodiment.

[0148] 8A and 8B , the pressure detection device 10C includes a flexible encapsulation layer 14C, a pressure sensor layer 11C, a flexible supporting layer 12C, and a reinforcement layer 13C sequentially stacked in the thickness direction.

[0149] This embodiment differs from the first and second embodiments in that the reinforcement layer 13C includes at least one rigid sheet, and the rigid sheets do not correspond one-to-one with the pressure sensors. That is, each rigid sheet may correspond to one or more pressure sensors. For example, each rigid sheet may correspond to some of the sensors in the pressure sensor layer 11C.

[0150] For example, referring to FIG8A , the reinforcement layer 13C may include a rigid sheet 131C and multiple rigid sheets 132C. The rigid sheet 131C corresponds to two pressure sensors 111, i.e., the projection of the rigid sheet 131C along the thickness direction covers the projections of the two pressure sensors 111 along the thickness direction. Thus, the rigid sheet 131C is used to simultaneously support and reinforce the two pressure sensors 111. The rigid sheet 132C corresponds to one pressure sensor 111, i.e., the projection of the rigid sheet 132C along the thickness direction covers the projection of one pressure sensor 111 along the thickness direction. Thus, the rigid sheet 132C is used to support and reinforce the one pressure sensor 111.

[0151] In some embodiments, multiple rigid sheets 131C may be provided, and / or one rigid sheet 132C may be provided. In other embodiments, the projection of the rigid sheet 131C along the thickness direction may cover the projections of two or more (e.g., three, five, etc.) pressure sensors 111 along the thickness direction, without specific limitation.

[0152] In some embodiments, referring to FIG8B , the reinforcing layer 13C may include only one rigid sheet 133C, and the projection of the rigid sheet 133C along the thickness direction covers the projection of all pressure sensors 111 along the thickness direction, that is, the rigid sheet 133C is used to support and reinforce all pressure sensors 111 at the same time, thereby further reducing the processing difficulty.

[0153] In some embodiments, the specific implementation method of the rigid sheet 131C, the rigid sheet 132C, and the rigid sheet 133C corresponding to one or more pressure sensors for reinforced support is essentially the same as the specific implementation method of the rigid sheet corresponding one-to-one to the pressure sensor for reinforced support in the first embodiment. Please refer to the relevant descriptions in the first and second embodiments and no further details will be given.

[0154] It can be understood that the flexible packaging layer 14C, the pressure sensor layer 11C, and the flexible support layer 12C in the pressure detection device 10C are essentially the same as the flexible packaging layer, the pressure sensor layer, and the flexible support layer in the first embodiment and the second embodiment. Please refer to the relevant descriptions in the first embodiment and the second embodiment and no further details will be given.

[0155] In summary, in this embodiment, the reinforcement layer is provided with at least one rigid sheet, and the rigid sheets and the pressure sensors are arranged in a non-one-to-one correspondence, thereby reducing the number of rigid sheets. While achieving the support and reinforcement function for the pressure sensor, it can reduce the processing difficulty and cost.

[0156] The following describes a fourth embodiment of the pressure detection device provided by this application. This embodiment can be based on the three embodiments described above. In this embodiment, based on the first, second, and third embodiments, the flexible sheets of the flexible packaging layer are arranged in a non-one-to-one correspondence with the pressure sensors, i.e., at least one flexible sheet corresponds to multiple pressure sensors, and the number of flexible sheets in the flexible packaging layer is less than the number of flexible sheets in the flexible packaging layer in the three embodiments described above, thereby reducing processing difficulty and cost.

[0157] Figures 9A to 9C illustrate exemplary structures of a pressure detection device 10D provided in a fourth embodiment of the present application. Figure 9A shows a front view of a first pressure detection device 10D, Figure 9B shows a front view of a second pressure detection device 10D, and Figure 9C shows a front view of a third pressure detection device 10D.

[0158] 9A and 9B , the pressure detection device 10D includes a flexible encapsulation layer 14D, a pressure sensor layer 11D, a flexible supporting layer 12D, and a reinforcement layer 13D sequentially stacked in the thickness direction.

[0159] In some embodiments, the difference from the above three embodiments is that the flexible encapsulation layer 14D may include at least one flexible sheet, and the flexible sheets do not correspond one-to-one with the pressure sensors. For example, referring to FIG9A , the flexible encapsulation layer 14D may include one flexible sheet 141D and multiple flexible sheets 142D. The projection of the flexible sheet 141D along the thickness direction covers the projections of two pressure sensors 111 along the thickness direction. The projection of the flexible sheet 142D along the thickness direction covers the projection of one pressure sensor 111 along the thickness direction.

[0160] In some embodiments, multiple flexible sheets 141D may be provided, and / or one flexible sheet 142D may be provided. In other embodiments, the projection of the flexible sheet 141D along the thickness direction may cover the projections of two or more (e.g., three, four, etc.) pressure sensors 111 along the thickness direction, without specific limitation.

[0161] In some embodiments, referring to FIG. 9B , the flexible encapsulation layer 14D may include only one flexible sheet 143D, and the projection of the flexible sheet 143D along the thickness direction covers the projections of all the pressure sensors 111 along the thickness direction.

[0162] It can be understood that the reinforcement layer 13D, pressure sensor layer 11D, and flexible support layer 12D in the pressure detection device 10D are essentially the same as the flexible packaging layer, pressure sensor layer, and flexible support layer in the first embodiment, the second embodiment, and the third embodiment. Please refer to the relevant descriptions in the first embodiment, the second embodiment, and the third embodiment and no further details will be given.

[0163] For example, referring to FIG9C , based on the third embodiment, in this implementation, the flexible sheet 143D in the flexible encapsulation layer 14D corresponds to all the pressure sensors 111 , and the rigid sheet 141D in the reinforcement layer 13D corresponds to all the pressure sensors 111 , so as to further reduce the processing difficulty and cost.

[0164] In summary, in this embodiment, the flexible packaging layer is provided with at least one flexible sheet, and the flexible sheets and the pressure sensors are arranged in a non-one-to-one correspondence, which reduces the number of flexible sheets and can reduce processing difficulty and cost.

[0165] It should be noted that the directional terms such as "upper", "lower", "left", "right", "front", "back", "top" and "bottom" in this document are based on the exemplary orientations shown in the accompanying drawings, and do not indicate or imply that the referred components must have a specific orientation. They may change accordingly according to actual use and should not be understood as limitations on this application.

[0166] In the above description of this embodiment, unless otherwise specified, " / " means or, for example, A / B can identify A or B; "and / or" in this article is merely a way to describe the association relationship of associated objects, indicating that three relationships can exist, for example, A and / or B can represent the existence of A alone, B alone, and the existence of A and B at the same time.

Claims

1. A pressure detection device, characterized in that: include: Multiple pressure sensors; A flexible supporting layer, the flexible supporting layer comprising a first surface and a second surface disposed opposite to each other along a first direction; The plurality of pressure sensors are attached to the first surface of the flexible supporting layer at intervals, and the plurality of pressure sensors are mechanically connected at least through the flexible supporting layer; One or more rigid sheets, wherein the one or more rigid sheets are attached to the second surface of the flexible supporting layer; Each of the one or more rigid sheets corresponds to a part of the pressure sensors among the multiple pressure sensors, and a projection of each of the rigid sheets along the first direction covers a projection of the corresponding pressure sensor along the first direction.

2. The pressure detection device according to claim 1, characterized in that: There are multiple rigid sheets, and the multiple rigid sheets correspond one-to-one to the multiple pressure sensors.

3. The pressure detection device according to claim 1 or 2, characterized in that: There are multiple rigid sheets, and the multiple rigid sheets are spaced apart from each other.

4. The pressure detection device according to any one of claims 1 to 3, characterized in that: The pressure detection device further comprises a flexible packaging layer, wherein the flexible packaging layer is arranged on a side of the pressure sensor layer facing away from the flexible support layer; Furthermore, a projection of the flexible encapsulation layer along the first direction at least covers projections of some of the pressure sensors among the plurality of pressure sensors along the first direction.

5. The pressure detection device according to claim 4, characterized in that: The flexible encapsulation layer includes one or more flexible sheets arranged at intervals, each of the one or more flexible sheets corresponds to some of the multiple pressure sensors, and the projection of each flexible sheet along the first direction covers the projection of the corresponding pressure sensor along the first direction.

6. The pressure detection device according to claim 5, characterized in that: There are multiple flexible sheets, and the multiple flexible sheets correspond one-to-one to the multiple pressure sensors.

7. The pressure detection device according to claim 5 or 6, characterized in that: The flexible sheet is in contact with the corresponding pressure sensor.

8. The pressure detection device according to any one of claims 1 to 7, characterized in that: The flexible supporting layer includes a flexible substrate and a wire disposed on the flexible substrate, and the plurality of pressure sensors are mechanically connected through the flexible substrate and electrically connected through the wire.

9. The pressure detection device according to any one of claims 1 to 8, characterized in that: The plurality of pressure sensors are arranged in one or more rows, and each row includes a plurality of the pressure sensors.

10. The pressure detection device according to claim 9, characterized in that: The plurality of pressure sensors are arranged in a plurality of rows, and the pressure sensors in the same row are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction; Furthermore, the pressure sensors in two adjacent rows are staggered along a third direction, and the third direction is perpendicular to the second direction and perpendicular to the first direction.

11. The pressure detection device according to claim 9, characterized in that: The gap between adjacent pressure sensors in the same row is 0.1 mm to 1 mm.

12. The pressure detection device according to any one of claims 1 to 11, characterized in that: The dimension of the pressure sensor along the first direction is less than or equal to 0.5 mm; and / or, The dimension of the pressure sensor in a second direction is less than or equal to 1 mm, and the second direction is perpendicular to the first direction; and / or, A dimension of the pressure sensor in a third direction is less than or equal to 1 mm, and the third direction is perpendicular to the second direction and the first direction.

13. The pressure detection device according to any one of claims 1 to 11, characterized in that: The material of the flexible substrate layer includes at least one of polydimethylsiloxane, an elastomeric compound, a flexible resin and a flexible silicone.

14. The pressure detection device according to any one of claims 1 to 13, characterized in that: The pressure sensor is a MEMS pressure sensor.

15. The pressure detection device according to claim 14, characterized in that: The MEMS pressure sensor is a silicon-based piezoresistive sensor, a silicon-based piezoelectric sensor or a silicon-based capacitive sensor.

16. An electronic device, characterized in that: It comprises a main body and a pressure detection device as described in any one of claims 1 to 15, wherein the pressure detection device is arranged on the surface of the main body.

17. The electronic device according to claim 16, characterized in that: The electronic device is a wearable device.

18. The electronic device according to claim 17, characterized in that: The wearable device is a wristband device.

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