Pressure detection device and electronic equipment

Abstract

The invention relates to the technical field of electronic equipment, and provides a pressure detection device and electronic equipment. The pressure detection device comprises a plurality of pressure sensors; the flexible supporting layer comprises a first surface and a second surface which are oppositely arranged in the 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; the one or more rigid sheets are attached to the second surface of the flexible supporting layer; wherein each rigid sheet in the one or more rigid sheets corresponds to part of the pressure sensors, and the projection of each rigid sheet in the first direction covers the projection of the pressure sensor corresponding to the rigid sheet in the first direction. Through the arrangement of the flexible supporting layer, the flexible packaging layer and the reinforcing layer, the pressure detection precision can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic devices, and particularly to a pressure detection device and an electronic device. Background Art

[0002] Continuous and long-term monitoring of blood pressure is an effective means for preventing and treating cardiovascular diseases. Currently, the main blood pressure detection devices are cuff blood pressure monitors. The cuff blood pressure monitor obtains blood pressure values by pressing the user's blood vessels with a cuff. It can only measure blood pressure intermittently, and due to the large size of the cuff, its portability is poor, and the cuff squeezing will cause discomfort to the user's arm.

[0003] With the development of micro-electro mechanical system (MEMS) technology, miniaturized pressure sensors have been designed and produced. Integrating the miniaturized pressure sensors into wearable devices can continuously detect the user's blood pressure for a long time and effectively improve the portability of the blood pressure detection device.

[0004] However, currently, after integrating the miniaturized pressure sensors into wearable devices, the blood pressure measurement accuracy is relatively low. Summary of the Invention

[0005] Some embodiments of the present application provide a pressure detection device and an electronic device. The present application will be introduced from multiple aspects below, and the embodiments and beneficial effects of the following multiple aspects can be referred to each other.

[0006] In a 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 includes a first surface and a second surface arranged opposite to each other along a first direction; the plurality of pressure sensors are spaced apart and attached to the first surface of the flexible support layer, and the plurality of pressure sensors are mechanically connected at least through the flexible support layer; one or more rigid sheets, the one or more rigid sheets are attached to the second surface of the flexible support layer; wherein, each rigid sheet in the one or more rigid sheets corresponds to a part of the pressure sensors in the plurality of 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.

[0007] According to the embodiment of the present application, by attaching a rigid sheet to the flexible support layer, when the pressure detection device is subjected to pressure, the rigid sheet can restrict the bending deformation of the pressure sensor, so as to facilitate the vertical transmission of pressure in the pressure sensor, thereby improving the detection accuracy of the pressure detection device.

[0008] In some embodiments, the number of rigid sheets is multiple, and the multiple rigid sheets correspond to the plurality of pressure sensors one by one.

[0009] According to the embodiments of the present application, each rigid sheet correspondingly restricts the bending deformation of each pressure sensor, further improving the detection accuracy of the pressure detection device.

[0010] In some embodiments, the number of rigid sheets is multiple, and the multiple rigid sheets are spaced apart from each other.

[0011] According to the embodiments of the present application, while the rigid sheet can be used to restrict the bending deformation of multiple pressure sensors, it can avoid collisions between adjacent rigid sheets when the pressure detection device is bent.

[0012] 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 in the first direction at least covers the projection of some of the multiple pressure sensors in the first direction.

[0013] According to the embodiments of the present application, the flexible encapsulation layer can be in contact with the user's wrist. During blood pressure detection, the pulse wave signal can be better transmitted to the pressure sensor layer through the flexible encapsulation layer, and when the flexible encapsulation layer fits with the user's wrist, it can reduce the discomfort of the user.

[0014] In some embodiments, the flexible encapsulation layer includes one or more flexible sheets arranged at intervals. Each flexible sheet in the one or more flexible sheets corresponds to some of the multiple pressure sensors, and the projection of each flexible sheet in the first direction covers the projection of the pressure sensor corresponding to it in the first direction.

[0015] According to the embodiments of the present application, the flexible sheet can better protect the pressure sensor while having higher force transmission accuracy.

[0016] In some embodiments, the number of flexible sheets is multiple, and the multiple flexible sheets correspond to the multiple pressure sensors one by one.

[0017] In some embodiments, the flexible sheet is attached to the pressure sensor corresponding to it.

[0018] According to the embodiments of the present application, the attachment of the flexible sheet to the pressure sensor can enable the flexible sheet to better transmit force to the pressure sensor.

[0019] In some embodiments, the flexible support layer includes a flexible substrate and wires disposed on the flexible substrate. The multiple pressure sensors are mechanically connected through the flexible substrate and electrically connected through the wires.

[0020] In some embodiments, the multiple pressure sensors are arranged in one row or multiple rows, and each row includes multiple pressure sensors.

[0021] According to the embodiments of the present application, it can be used for pressure detection in different scenarios.

[0022] In some embodiments, multiple pressure sensors are arranged in multiple rows, the pressure sensors in the same row are arranged at intervals along the second direction, and the second direction is perpendicular to the first direction; and, the pressure sensors in adjacent rows are arranged staggeredly along the third direction, and the third direction is perpendicular to the second direction and perpendicular to the first direction.

[0023] 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.

[0024] In some embodiments, the gap between adjacent pressure sensors in the same row is 0.1 mm to 1 mm.

[0025] According to the embodiments of the present application, the flexible support layer located at the gap position between adjacent pressure sensors can deform flexibly so that the pressure detection device can conform to the surface of the object to be detected.

[0026] 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.

[0027] According to the embodiments of the present application, while ensuring a higher density of the arranged pressure sensors, the overall size of the pressure detection device can be reduced, and the pressure detection accuracy can be improved.

[0028] In some embodiments, the material of the flexible substrate layer includes at least one of polydimethylsiloxane, elastomeric compounds, flexible resins, and flexible silica gels.

[0029] In some embodiments, the pressure sensor is a MEMS pressure sensor.

[0030] 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.

[0031] In some embodiments, the MEMS pressure sensor is a silicon-based piezoresistive sensor, a silicon-based piezoelectric sensor, or a silicon-based capacitive sensor.

[0032] In a second aspect, the present application further provides an electronic device, which includes a main body and the pressure detection device of the first aspect above, and the pressure detection device is disposed on the surface of the main body. The effects that can be achieved in the second aspect can refer to any of the embodiments of the pressure detection device provided in the first aspect, and will not be elaborated here.

[0033] In some embodiments, the electronic device is a wearable device.

[0034] In some embodiments, the wearable device is a wristband device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1A Schematic diagram of the application scenario of the pressure detection device provided by the embodiment of the present application;

[0036] Figure 1B For Figure 1A A-A cross-sectional view;

[0037] Figure 1C Schematic diagram one of the pressure detection device in some embodiments;

[0038] Figure 1D Schematic diagram two of the pressure detection device in some embodiments;

[0039] Figure 2A Stereogram one of the pressure detection device provided by the embodiment of the present application;

[0040] Figure 2B For Figure 2A B-B cross-sectional view;

[0041] Figure 2C Schematic cross-sectional view of the cooperation between the pressure detection device provided by the embodiment of the present application and the wrist;

[0042] Figure 3A Schematic diagram one of the cooperation between the sensor array provided by the embodiment of the present application and the blood vessel;

[0043] Figure 3B Schematic diagram two of the cooperation between the sensor array provided by the embodiment of the present application and the blood vessel;

[0044] Figure 3C Schematic diagram three of the cooperation between the sensor array provided by the embodiment of the present application and the blood vessel;

[0045] Figure 4A Top view of the pressure sensor layer provided by the embodiment of the present application;

[0046] Figure 4B Schematic diagram of the cooperation between adjacent sensors provided by the embodiment of the present application;

[0047] Figure 4C For Figure 4B Top view;

[0048] Figure 5A Front view of the positional relationship between the flexible sheet, the rigid sheet and the pressure sensor provided by the embodiment of the present application;

[0049] Figure 5B is Figure 5A The projection view of the rigid sheet and the pressure sensor on the plane M;

[0050] Figure 5C is Figure 5A The projection view of the flexible sheet and the pressure sensor on the plane M;

[0051] Figure 6A The schematic cross-sectional structure diagram of the pressure sensor provided by the embodiment of the present application;

[0052] Figure 6B The deformation state diagram of the pressure sensor when the rigid sheet is not provided in some embodiments under pressure;

[0053] Figure 6C The deformation state diagram of the pressure sensor provided by the embodiment of the present application under pressure;

[0054] Figure 7A The second perspective view of the pressure detection device provided by the embodiment of the present application;

[0055] Figure 7B is Figure 7A The C-C sectional view of;

[0056] Figure 7C The top view of the pressure sensor array when the pressure detection device provided by the embodiment of the present application is worn on the wrist;

[0057] Figure 7D The top view of the pressure sensor array when the pressure detection device provided by some embodiments is worn on the wrist;

[0058] Figure 8A The first schematic cross-sectional view of the pressure detection device provided by the embodiment of the present application;

[0059] Figure 8B The second schematic cross-sectional view of the pressure detection device provided by the embodiment of the present application;

[0060] Figure 9A The third schematic cross-sectional view of the pressure detection device provided by the embodiment of the present application;

[0061] Figure 9B The fourth schematic cross-sectional view of the pressure detection device provided by the embodiment of the present application;

[0062] Figure 9C The fifth schematic cross-sectional view of the pressure detection device provided by the embodiment of the present application. Detailed Description of the Embodiment

[0063] The following will describe the specific embodiments of the present application in detail with reference to the accompanying drawings.

[0064] Embodiments of the present application are used to provide a pressure detection device to improve detection accuracy. Figure 1A and Figure 1B FIG. shows an exemplary application scenario of the pressure detection device provided by the embodiments 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, a smart pressure sensing patch (for example, a patch that can be attached to the brachial artery or carotid artery), etc. The present application does not make specific limitations. Hereinafter, the wearable device 100 is taken as an example of a wristband device for detailed description.

[0065] It should be noted that, Figure 1A and Figure 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 disposed on the surface of terminal devices such as headphones and styluses. When the user is using the terminal device, the pressure detection device 10 can detect the user's pressure (for example, the holding pressure of the user on the stylus, the contact pressure between the headphone and the user's ear); for another example, the pressure detection device 10 can be applied to the surface of the steering wheel or joystick of a smart cockpit for detecting the user's operating pressure to facilitate the smart cockpit to perform tactile feedback and sensing recognition on the user's operation; for another example, the pressure detection device 10 can be disposed on the surface of a robot as a tactile sensor of the robot for tactile feedback recognition of the robot; for another example, the pressure detection device 10 can also be disposed on the surface of a pipeline for detecting the impact pressure of the fluid (for example, seawater) in the pipeline on the pipeline wall to facilitate the detection and defect location of the pipeline; in addition, the pressure detection device 10 can also be applied to other industrial, aviation, and aerospace fields, etc., which will not be elaborated one by one.

[0066] Figure 1A and Figure 1B FIG. shows an exemplary structure of the wearable device 100 provided by the embodiments of the present application, where Figure 1A is a three-dimensional structure diagram of the wearable device 100, Figure 1B is Figure 1A a schematic cross-sectional view of A-A of Figure 1A In addition, for ease of understanding,

[0067] Referring to Figure 1A and Figure 1B, the wearable device 100 provided by the embodiments of the present application may include a main body 20 and a pressure detection device 10. Among them, 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, for example, display, play audio, communicate, etc.

[0068] The wristband 22 is used to wear the watch body 21 on the user's wrist 200. The wristband 22 has the ability to deform and can bend adaptively according to the shape of the wrist 200. For example, the wristband 22 can be made of flexible materials such as knitted fabric, leather, plastic, etc., or can be composed of multiple rotatably connected metal blocks, so that it can extend around the user's wrist 200 to wear the watch body 21 on the user's wrist 200. The connection method between the watch body 21 and the wristband 22 can be various methods such as snap connection, bonding, clamping connection, etc., which can be a detachable connection or a fixed connection, and the present application does not make a limitation.

[0069] The pressure detection device 10 can be disposed on the inner surface 221 of the wristband 22. Among them, the inner surface 221 of the wristband 22 is the surface of the wristband 22 facing the user in the wearing state of the wearable device 100. When the user wears the wearable device 10, the pressure detection device 10 can be aligned with the blood vessels of the user's wrist 200, so as to detect the user's blood pressure.

[0070] In the embodiments of the present application, one pressure detection device 10 can be provided on the wearable device 100, or multiple pressure detection devices 10 can be provided. Refer to Figure 1B , two pressure detection devices 10 are provided on the wearable device 100, and the two pressure detection devices 10 can be respectively aligned with the wrist blood vessel 201 and the wrist blood vessel 202, so as to detect the blood pressure in the blood vessels 201 and 202 respectively. The blood pressure detection results of multiple pressure detection devices 10 can be mutually verified, so as to improve the accuracy of blood pressure measurement.

[0071] Figure 1C Shows an exemplary structure of the pressure detection device 10' in some embodiments. Refer to Figure 1C , the pressure detection device 10' includes a pressure sensor 111' and a rigid encapsulation structure 12'. During the blood pressure detection process, the surface of the pressure sensor 111' can be pressed against the user's body surface, so as to measure 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 it is necessary to accurately align the pressure sensor 111' with the user's blood vessel to measure the user's blood pressure. In addition, the pressure sensor 111' is rigidly encapsulated, and during the blood pressure measurement process, mechanical pressure needs to be applied to the pressure sensor 111', and this mechanical pressure will cause discomfort to the user.

[0072] Figure 1DIllustrates the exemplary structure of the pressure detection device 10” in some other embodiments. Refer to Figure 1D , the pressure detection device 10” includes a sensor array composed of a plurality of pressure sensors 111” and a rigid encapsulation 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 encapsulation structure 12” limits the pressure conduction of some pressure sensors 111”, affecting the blood pressure detection accuracy of the pressure detection device 10”, and bringing a strong sense of pressure to the user. In addition, the rigid encapsulation structure 12” will limit the array density of the pressure sensors 111”. For example, the spacing between adjacent pressure sensors 111” can only be more than millimeters. 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”.

[0073] For this reason, this embodiment provides a pressure detection device, including 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 deform accordingly according to the shape of the surface of the object to be detected (e.g., the user's body), so as to realize the conformal of the pressure detection device with the object to be detected. Compared with Figure 1C and Figure 1D the rigid encapsulation structure in can improve the accuracy of pressure detection and can reduce the sense of pressure on the user.

[0074] In addition, the pressure detection device further includes a reinforcement layer, and the reinforcement layer can include one or more rigid sheets, and the rigid sheets are aligned with the pressure sensors in the stacking direction. When the pressure detection device is bent, the rigid sheets can constrain the lateral deformation of the pressure sensors, so as to realize the vertical propagation of pressure in the pressure sensors, and further improve the detection accuracy of the pressure detection device.

[0075] In some embodiments, the pressure sensors are MEMS sensors. Since MEMS sensors can achieve extremely small sizes, for example, sizes below millimeters, the array density of the sensor array can be increased, and further improve the detection accuracy of the pressure detection device.

[0076] The following introduces the first embodiment of the pressure detection device provided by this application.

[0077] Figures 2A to 2C Illustrates the exemplary structural diagram of the pressure detection device 10A provided in the first embodiment of this application. Among them, Figure 2A is the three-dimensional view of the pressure detection device 10A, Figure 2B is Figure 2ACross-sectional view taken along line B-B, Figure 2C shows 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.

[0078] In the drawings of this document, the X-axis direction represents the thickness direction of the pressure detection device 10A or the stacking direction of the layers of the pressure detection device 10A (as the first direction), the Y-axis direction is the length direction of the pressure detection device 10A (as the second direction), and the Z-axis direction is the width direction of the pressure detection device 10A (as the third direction), and will not be emphasized separately hereafter. Among them, the X-axis direction, the Y-axis direction, and the Z-axis direction can be perpendicular to each other in pairs.

[0079] In addition, for ease of understanding, in this document, the surface of each structure facing the positive X-axis direction is called the front surface of the structure, and the surface of each structure facing away from the positive X-axis direction is called the back surface of the structure. The length, width, and thickness of each component are the dimensions of the component along the Y-axis direction, the Z-axis direction, and the X-axis direction, respectively.

[0080] In addition, in the following description, the wrist blood vessel 201 of the wrist 200 is taken as an example of the blood vessel to be detected. It can be understood that the present application is not limited thereto. In other examples, the blood vessel to be detected can be other blood vessels of the user's body.

[0081] Reference Figure 2A and Figure 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 that are stacked in sequence along the thickness direction. Reference Figure 2C , when the wearable device 100 is worn on the 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 circumferential direction of the user's wrist 200.

[0082] In addition, when the pressure detection device 10A is disposed 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. Among them, the flexible encapsulation layer 14A is located on the side of the pressure detection device 10A facing the user's wrist 200, and the reinforcement layer 13A is located on the side of the pressure detection device 10A facing the wristband 22 of the wearable device 100. Exemplarily, the reinforcement layer 13A can be attached to the inner surface 221 of the wristband 22, and the flexible encapsulation layer 14A can be used to contact (e.g., attach to) the user's wrist 200. During blood pressure detection, the pulse wave signal in the blood vessel of the wrist 200 can be transmitted to the pressure sensor layer 11A through the flexible encapsulation layer 14A.

[0083] The following will be described in conjunction withFigures 2A to 2C Specifically introduce the respective layer structures of each pressure detection device 10A.

[0084] First, introduce the exemplary structure of the pressure sensor layer 11A. Refer to Figure 2A and Figure 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 measurement surface 1111 (i.e., the upper surface of the pressure sensor 111), and output a corresponding electrical signal according to the sensed pressure magnitude. For example, the pressure sensor 111 can output a current signal or a voltage signal proportional to the pressure magnitude. 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 vessel, the pressure detection device 10A can detect the pulse wave signal in the blood vessel 201. Therefore, compared with Figure 1C the single pressure sensor solution in, the pressure detection device 10A provided by the embodiment of the present application can reduce the alignment accuracy requirement between the pressure detection device 10A and the blood vessel 201.

[0085] Furthermore, refer to Figure 2A and Figure 2B , the plurality of pressure sensors 111 can be arranged in an array. That is, the plurality of pressure sensors 111 can be arranged in multiple rows and multiple columns to form a sensor array 110A. Among them, 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. Refer to Figure 2A and Figure 2B , each row of the sensor array 110A can include a plurality of pressure sensors 111.

[0086] In other examples, the sensor array 110A can also be one row with multiple columns, with a plurality of pressure sensors 111 in one row, and each pressure sensor 111 forms a column. It can be understood that the number of rows and columns of the sensor array 110A can be adaptively adjusted according to requirements, such as 1 row and 6 columns, 3 rows and 9 columns, 8 rows and 8 columns, etc., as long as there are a plurality of pressure sensors 111 in the same row, and no specific limitation is made.

[0087] It can be understood that when the pressure detection device 10A is provided in the wearable device 100, the row direction (i.e., the X-axis direction) of the sensor array 110A 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 or substantially parallel to the circumferential direction of the user's wrist 200.

[0088] Generally speaking, the extension direction of the blood vessel 201 is roughly parallel to the extension direction of the arm, that is, roughly perpendicular to the circumference direction of the wrist 200. For this reason, in this embodiment, a plurality of pressure sensors 111 are provided in the row direction of the sensor array 110A. In this way, when the wearable device 100 is worn on the user's wrist 200, it is easier to ensure that at least one pressure sensor 111 in the same row of pressure sensors 111 is aligned with the blood vessel 201 of the wrist 200, further reducing the alignment accuracy requirement between the pressure detection device 10A and the blood vessel 201.

[0089] Figures 3A to 3C FIG. 1 shows the effect of setting the sensor array 110A to different densities on the blood pressure measurement results. Figures 3A to 3C , the array density of the sensor array 110A increases successively. In addition, for the convenience of observation, Figures 3A to 3C In FIG. 1 , the pressure sensor 111 aligned with the blood vessel 201 is shown by a shaded rectangle, and the pressure sensor 111 not aligned with the blood vessel 201 is shown by a non-shaded rectangle.

[0090] refer to Figure 3A , when the sensor array 110A has an array density ρ1, there may be one pressure sensor 111 aligned with the blood vessel 201 in the same row. Figure 3B When the sensor array 110A has an array density of ρ2 (ρ2>ρ1), two pressure sensors 111 can be simultaneously aligned with the blood vessel 201 in the same row. Figure 3C , when the sensor array 110A has an array density ρ3 (ρ3>ρ2), there can be four pressure sensors 111 in the same row aligned with the blood vessel 201. That is, the higher the array density of the sensor array 110A, the more favorable it is to reduce the alignment accuracy requirement between the pressure detection device 10A and the blood vessel 201.

[0091] To this end, in some embodiments of the present application, a MEMS sensor that can achieve 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 can be a silicon-based piezoresistive sensor, a silicon-based piezoelectric sensor, or a silicon-based capacitive sensor, etc., without specific limitation.

[0092] Figure 4A FIG. 1 is a top view of the pressure sensor layer 11A, which shows an exemplary size setting method of the pressure sensor array 110A provided in an embodiment of the present application. Figure 4A The length L0 of a single pressure sensor 111 may not exceed 1 mm (for example, 0.8 mm, 1 mm), the width W0 may not exceed 1 mm (for example, 0.8 mm, 1 mm), and the thickness may not exceed 0.5 mm (for example, 0.4 mm, 0.5 mm).

[0093] In addition, since the pressure sensor 111 has 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 Figure 4B and Figure 4C ( Figure 4C which is Figure 4B a top view), when the wearable device 10A is worn on the user's wrist 200, interference occurs between adjacent pressure sensors 111-1 and 111-2 in the same row. For easy observation, Figure 4B and Figure 4C the interference area between adjacent sensors 111 is shown by the shaded part.

[0094] Therefore, in the embodiments of the present application, there may be a gap between adjacent pressure sensors 111 in the same row. For example, referring to Figure 4A , in the same row, the gap L1 (as the first gap) between adjacent pressure sensors 111 may be 0.1 mm to 1 mm (for example, 0.3 mm, 1 mm). In the same column, the gap W1 (as the first gap) between adjacent pressure sensors 111 may not exceed 0.1 mm to 1 mm (for example, 0.3 mm, 1 mm).

[0095] In the embodiments 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. In addition, due to the high array density of the sensor array 110A, more pressure sensors 111 in the sensor array 110A are aligned with the blood vessel 201, thereby improving the blood pressure measurement accuracy of the pressure detection device 10A.

[0096] The following introduces an exemplary structure of the flexible support layer 12A. Referring to Figure 2A and Figure 2B , the flexible support layer 12A includes a surface 121A (which can also be referred to as the front surface 121A of the flexible support layer 12A, as the first surface) and a surface 122A (which can also be referred to as the back surface 122A of the flexible support layer 12A, as the second surface) arranged opposite to each other in the thickness direction. The pressure sensor layer 11A is provided on the surface 121A, and the reinforcing layer 13A is provided on the surface 122A.

[0097] 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 a downward pressure F1, the flexible support layer 12A can provide an upward acting force F2 for the pressure sensor 111. In addition, the flexible support layer 12A has a deformation ability. Referring to Figure 2CWhen the wearable device 100 is worn on the user's wrist 200, the flexible support layer 12A can generate a deformation adapted to the shape of the user's wrist 200, thereby realizing the conformal of the pressure detection device 10A with the user's wrist 200, so that each pressure sensor 111 can be attached to the surface of the user's wrist 200. In this way, the measurement surface 1111 of the pressure sensor 111 (i.e., the front surface of the pressure sensor 111) can be substantially perpendicular to the normal direction of the surface of the user's wrist 200, which is beneficial 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 measurement surface 1111), thereby improving the detection accuracy of the pressure detection device 10A.

[0098] The flexible support layer 12A can be prepared from a flexible material with flexible deformation ability, such as polyimide (PI), polyethylene terephthalate (PET), polydimethylsiloxane (PDMS), flexible resin, flexible silica gel, etc., without specific limitation.

[0099] In some embodiments, the flexible support layer 12A is at least used to provide mechanical connection for the multiple pressure sensors 111 in the pressure sensor layer 11A. For example, each pressure sensor 111 can be mechanically connected to the flexible support layer 12A respectively. In this way, the multiple pressure sensors 111 in the pressure sensor layer 11A can be mechanically (or "physically") interconnected through the flexible support layer 12A, so that the multiple pressure sensors 111 will not be physically separated from each other. The mechanical connection methods between each pressure sensor 111 and the flexible support layer 12A can include bonding, welding, snap connection and other forms, which are not limited in this application.

[0100] In other embodiments, the flexible support 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 support layer 12A includes a flexible substrate and wires. The flexible substrate can be prepared from the above flexible materials with deformation ability (for example, PI, PET), and the wires can be formed on the flexible substrate by means of 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 wires. Exemplarily, the electrical connection between the electrodes of the pressure sensor 111 and the wires in the flexible support layer 12A can be realized by means of wire bonding, or the electrodes of the pressure sensor 111 can be welded to the wires of the flexible support layer 12A by means of chip bonding to realize their electrical connection.

[0101] In some embodiments, the thickness of the flexible support layer 12A may be less than or equal to 0.5 mm, so as to ensure that while the flexible support layer 12A meets the support ability for the pressure sensor layer 11A, it has strong flexible deformation ability.

[0102] In the embodiments of the present application, by providing the flexible support layer 12A, the connection of the sensor array 110A can be realized. While improving the relative stability of multiple pressure sensors 111, when the wearable device 100 is worn on the wrist 200, the flexible support layer 12A can deform along with the shape of the wrist 200, so that the measurement surface 1111 of the pressure sensor 111 can be substantially 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.

[0103] The exemplary structure of the reinforcing layer 13A is introduced below. Refer to Figure 2A and Figure 2B , the reinforcing layer 13A may include a plurality of rigid sheets 131A, and each rigid sheet 131A is attached to the back surface 122A of the flexible support layer 11. For example, it is attached to the back surface 122A of the flexible support layer 12A by means of bonding, welding, etc. The back surface of the rigid sheet 131A can be used to connect with the wristband 22.

[0104] Exemplarily, refer to Figure 2A and Figure 2B , the number of the rigid sheets 131A may be the same as the number of the pressure sensors 111, and the plurality of rigid sheets 131A correspond to the plurality of pressure sensors 111 one by one. The projection of each rigid sheet 131A in the thickness direction covers the projection of the corresponding pressure sensor 111 in the thickness direction.

[0105] For easy understanding, Figure 5A and Figure 5B show a schematic diagram of the positional relationship between the corresponding rigid sheet 131A and the pressure sensor 111. Among them, Figure 5A is the front view of the rigid sheet 131A and the pressure sensor 111, Figure 5B is the projection view of the rigid sheet 131A and the pressure sensor 111 on the plane M, and the plane M is perpendicular to the thickness direction of the pressure detection device 10A.

[0106] Refer to Figure 5A and Figure 5B, the projection of the pressure sensor 111 in the thickness direction onto the plane M is the projection 1110, and the projection of the rigid sheet 131 in the thickness direction onto the plane M is the projection 1310. The projection 1110 of the pressure sensor 111 has a length L0, and the projection 1310 of the rigid sheet 131A has a length L3, where L3 > L0; the projection 1110 of the pressure sensor 111 has a width W0, and the projection 1310 of the rigid sheet 131A has a width W3, where W3 > W0; the shadow area of the projection 1110 of the pressure sensor 111 is smaller than the shadow area of the projection 1310 of the rigid sheet 131A, and the shadow area of the projection 1110 is located within the shadow area of the projection 1310, that is, the projection of the rigid sheet 131A in the thickness direction covers the projection of the corresponding pressure sensor 111 in the thickness direction.

[0107] In some embodiments, the length and width of the rigid sheet 131A can be the same as the length and width of the corresponding pressure sensor 111 respectively. In other embodiments, the length of the rigid sheet 131A can be slightly greater than the length of the corresponding pressure sensor 111, and / or, the width of the rigid sheet 131A can be slightly greater than the width of the corresponding pressure sensor 111.

[0108] The following combines Figures 6A to 6C to give an exemplary introduction to the function of the rigid sheet 131A. Among them, Figure 6A is an exemplary structure of the pressure sensor 111A, Figure 6B is the deformation state of the pressure sensor 111A when no rigid sheet 131A is provided under pressure, Figure 6C is the deformation state of the pressure sensor 111A when the rigid sheet 131A is provided under pressure.

[0109] Referring to Figure 6A and Figure 6B , the pressure sensor 111 is an elastic structure with a certain thickness. When the measurement surface 1111 of the pressure sensor 111 is subjected to a downward pressure F1, the pressure sensor 111 will produce a bending deformation, that is, different degrees of lateral deformation (deformation perpendicular to the action direction of the pressure F1) will occur in each part of the pressure sensor 111. For example, the upper part structure of the pressure sensor 111 produces a lateral compression deformation, and the lower part structure produces a lateral tensile deformation. When the pressure sensor 111 produces a bending deformation, the direction of the pressure F1 may no longer be parallel to the thickness direction of the pressure sensor 111, but form an angle θ with the thickness direction of the pressure sensor 111. That is, the pressure F1 cannot be vertically transmitted in the pressure sensor 111, thus affecting the detection accuracy of the pressure sensor 111.

[0110] To this end, in the embodiments of the present application, the pressure detection device 10A further includes a rigid sheet 131A disposed on the back surface of the flexible support layer 12A. The rigid sheet 131A has a relatively large stiffness. Exemplarily, the stiffness 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 some 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 metallic material (such as steel, aluminum, etc.), rigid plastic, glass, etc., which is not limited in the present application.

[0111] Referring to Figure 6C , after the rigid sheet 131A is attached to the back surface 122A of the flexible support layer 12A, the portion of the flexible support layer 12A that is in contact with the rigid sheet 131A and the rigid sheet 131A together form a constraint structure 15A for the pressure sensor 111. It can be understood that the stiffness of the constraint structure 15A is substantially the same as the stiffness of the rigid sheet 131A. In this way, when the pressure sensor 111 is subjected to a pressure F1, the lower part structure of the pressure sensor 111 will be constrained by the constraint structure 15A. That is, under the action of the pressure F1, the lower part structure of the pressure sensor 111 hardly generates lateral deformation, so that the pressure sensor 111 as a whole hardly generates bending deformation any more. In this way, the pressure F1 can be propagated along the thickness direction of the pressure sensor 111, that is, the vertical propagation of the pressure F1 in the pressure sensor 111 is realized, so as to improve the detection accuracy of the pressure sensor 111.

[0112] Furthermore, referring to Figures 2A to 2C , a plurality of rigid sheets 131A can be arranged at intervals from each other, that is, there can be a gap between adjacent rigid sheets 131A. In this way, when the wearable device 100 is worn on the user's wrist 200, the portion of the flexible support layer 12A corresponding to the gap can be deformed flexibly, so that the pressure detection device 10A can conform to the user's wrist 200.

[0113] In some embodiments, the thickness of the rigid sheet 131A can not exceed 1 mm to reduce the overall thickness of the pressure detection device 10A. For example, the thickness of the rigid sheet 131A is 0.8 mm, 1 mm, etc.

[0114] In the embodiments of the present application, by providing the reinforcement layer 13A on the back surface 122A of the flexible support layer 12A, a lateral binding force can be provided when the pressure sensor 111 is pressed, so as to improve the structural stability of the pressure sensor 111, realize the vertical propagation of the pressure in the pressure sensor 111, and thus improve the detection accuracy of blood pressure.

[0115] The exemplary structure of the flexible encapsulation layer 14A is introduced below. Refer to Figures 2A to 2C , the flexible encapsulation layer 14A is disposed on the front side of the pressure sensor layer 11A, and the projection of the flexible encapsulation layer 14A in the thickness direction covers the projection of the pressure sensor 111 in the thickness direction.

[0116] The flexible encapsulation layer 14A has the ability of flexible deformation. Refer to Figure 2C , when the wearable device 100 is worn on the user's wrist 200, the flexible encapsulation layer 14A can generate a deformation adapted to the shape of the user's wrist 200, so as to realize the conformal of the front surface of the flexible encapsulation layer 14A with the surface of the user's wrist 200, and make the measurement surface 1111 of each pressure sensor 111 can be substantially perpendicular to the normal direction of the surface of the user's wrist 200, which is beneficial to the vertical transmission of the pulse wave signal in the blood vessel to the pressure sensor 111, thereby improving the detection accuracy of the pressure detection device.

[0117] The flexible encapsulation layer 14A can be prepared from a flexible material with the ability of flexible deformation, such as PDMS, flexible resin, flexible silica gel, biodegradable plastic, etc., without specific limitation.

[0118] In some embodiments, the flexible deformation ability of the flexible encapsulation layer 14A can be equal to or greater than that of the flexible support layer 12A, so as to achieve a better conformal effect between the front surface of the flexible encapsulation layer 14A and the surface of the user's wrist 200, and can reduce the discomfort of the user's wrist 200 and improve the user experience. In addition, the flexible encapsulation layer 12A can also protect the pressure sensor layer 11A.

[0119] In some embodiments, the flexible encapsulation layer 14A can include a plurality of flexible sheets 141A, and each flexible sheet 141A is attached to the front surface of the pressure sensor 111. For example, it can be attached to the front surface of the pressure sensor 111 by means of encapsulation, bonding, etc. The front surface of the flexible sheet 141A (i.e., the encapsulation surface 1411A of the flexible sheet 141A) is used to fit with the surface of the wrist 200, and the front surface of the flexible sheet 141A can be conformal with the surface of the wrist 200. In other embodiments, other structures can also be provided between the flexible sheet 141A and the pressure sensor 111.

[0120] Exemplarily, refer to Figure 2A and Figure 2B , the number of the flexible sheets 141A can be the same as that of the pressure sensors 111, and the plurality of flexible sheets 141A correspond to the plurality of pressure sensors 111 one by one. The projection of each flexible sheet 141A in the thickness direction covers the projection of the corresponding pressure sensor 111 in the thickness direction.

[0121] For easy understanding, Figure 5A and Figure 5CA schematic diagram of the positional relationship between the corresponding flexible sheet 141A and the pressure sensor 111 is shown. Among them, Figure 5A is the front view of the flexible sheet 141A and the pressure sensor 111, Figure 5C is the projection view of the flexible sheet 141A and the pressure sensor 111 on the plane M, and the plane M is perpendicular to the thickness direction of the pressure detection device 10A.

[0122] That is, referring to Figure 5A and Figure 5C , the projection of the flexible sheet 141A along the thickness direction onto the plane M is the projection 1410, and the projection of the pressure sensor 111 along the thickness direction onto the plane M is the projection 1110. The projection 1110 of the pressure sensor 111 has a length L0, and the projection 1410 of the flexible sheet 141A has a length L4, L0 > L4; the projection 1110 of the pressure sensor 111 has a width W0, and the projection 1410 of the flexible sheet 141A has a width W4, W0 > W4. The shadow area of the projection 1110 of the pressure sensor 111 is larger than the shadow area of the projection 1410 of the flexible sheet 141A, and the shadow area of the projection 1410 is located within the shadow area of the projection 1110, that is, the projection of the pressure sensor 111 along the thickness direction covers the projection of the corresponding flexible sheet 141A along the thickness direction.

[0123] In some embodiments, the length L4 and width W4 of the flexible sheet 141A can be the same as the length L0 and width W0 of the corresponding pressure sensor 111 respectively. In other embodiments, the length L4 of the flexible sheet 141A can be slightly larger than the length L0 of the corresponding pressure sensor 111, and / or the width W4 of the flexible sheet 141A can be slightly larger 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, so that the flexible sheet 141A can better protect the pressure sensor 111 while being able to transmit force.

[0124] The front surface of the flexible sheet 141A is used to conform to the surface of the wrist 200. For example, referring to Figure 2C, when the wearable device 100 is worn on the user's wrist 200, the encapsulation surface 1411A of the flexible sheet 141A contacts the surface of the wrist 200 and can deform correspondingly with the shape of the surface of the wrist 200. For example, if there is a protrusion on the surface of the wrist 200, when the encapsulation surface 141A fits with the surface of the wrist 200, the encapsulation surface 141A forms a depression matching the protrusion, so that the encapsulation surface 141A can be approximately or completely fitted with the surface of the wrist 200. At this time, the thickness direction of the flexible sheet 141A is maintained 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 measured by the measurement surface 1111 of the pressure sensor 111 can be substantially perpendicular to the normal direction of the measurement surface 1111, which is conducive to the vertical propagation of the pressure in the pressure sensor 1111 and improves the measurement accuracy of the pressure sensor 111.

[0125] Further, referring to Figures 2A to 2C , multiple flexible sheets 141A can be arranged at intervals from each other, that is, there can be a gap between adjacent flexible sheets 141A. In this way, after the wearable device 100 is worn on the user's wrist 200, the gap between adjacent flexible sheets 141A enables the encapsulation surface 1411A of the flexible sheet 141A to better adapt to the shape of the wrist surface, so that the pressure detection device 10A can be conformal with the user's wrist 200.

[0126] Further, considering that 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, and if the thickness of the flexible sheet 141A is too small, it will affect the protection 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 balance the force transmission effect and the protection effect of the flexible sheet 141A

[0127] In the embodiment of the present application, the flexible encapsulation layer 14A provided can be used to fit with the surface of the user's wrist 200. While being able to reduce the discomfort of the user wearing the wearable device 100, the flexible encapsulation layer 14A makes the pressure transmitted from the flexible sheet 141A to the measurement surface 1111 of the pressure sensor 111 can be substantially perpendicular to the normal direction of the surface of the user's wrist 200 through conformal with the surface of the user's wrist 200, thereby improving the blood pressure detection accuracy.

[0128] In summary, the embodiment of the present application provides a pressure detection device 10A, which forms a flexible encapsulation structure of the pressure sensor through the flexible support layer 12A and the flexible encapsulation layer 14A. Thus, during the pressure detection process, the pressure detection device 10A can be conformal with the measured surface (for example, the surface of the user's wrist 100) to improve the pressure detection accuracy.

[0129] In addition, the pressure detection device 10A further includes a rigid sheet 131A for restricting the bending deformation of the pressure sensor 111, which is beneficial to realizing the vertical transmission of pressure in the pressure sensor and further improving the pressure detection accuracy.

[0130] It can be understood that this embodiment is an exemplary structure of the pressure detection device, and those skilled in the art can make other deformations. For example, in some embodiments, the pressure detection device 10A may not include the flexible encapsulation layer 14A.

[0131] The following introduces the second embodiment of the pressure detection device provided by the present application. This embodiment can be based on the first embodiment. On the basis of the first embodiment, the pressure sensors located in adjacent rows in the pressure sensor layer are arranged in a staggered manner to increase the layout density of the pressure sensors, thereby increasing the resolution of the pressure detection device.

[0132] Figure 7A and Figure 7B shows an exemplary structure of the pressure detection device 10B provided in the second embodiment of the present application. Among them, Figure 7A shows a perspective view of the pressure detection device 10B, Figure 7B shows a top view of the pressure sensor layer 11B.

[0133] Reference Figure 7A , the pressure detection device 10B includes a flexible encapsulation layer 14B, a pressure sensor layer 11B, a flexible support layer 12B, and a reinforcement layer 13B that are stacked in sequence along the thickness direction.

[0134] Reference Figure 7A and Figure 7B , the pressure sensor layer 11B may include a plurality of pressure sensors 111. The plurality of pressure sensors 111 may be arranged in multiple rows and multiple columns to form a sensor array 110B. Among them, the Y-axis direction is the row direction of the sensor array 110B, and the Z-axis direction is the column direction of the sensor array 110B. Reference Figure 7A and Figure 7B , the sensor array 110B may include multiple rows, such as the first row of sensors 1011B, the second row of sensors 1002B,..., the Nth row of sensors 110NB, where N is a positive integer greater than or equal to 2. Among them, each row may include a plurality of pressure sensors 111.

[0135] In some embodiments, the plurality of pressure sensors 111 arranged in each row of sensors are substantially the same as the plurality of pressure sensors 111 arranged in the row direction in the sensor array 110B of the first embodiment. The relevant descriptions in the first embodiment can be referred to and will not be elaborated here. For example, to avoid interference between adjacent sensors in the same row when the wearable device is worn on the user's wrist, there may be a spacing L1 between adjacent sensors in the same row.

[0136] The difference between the second embodiment and the first embodiment of this application is that: the pressure sensors 111 in adjacent rows are arranged offset in the width direction (i.e., the Z-axis direction). That is, the projection of each row of pressure sensors 111 in the width direction does not overlap with the projection of the pressure sensors 111 in the adjacent row in the width direction. Exemplarily, referring to Figure 7B , there is a gap L1 between adjacent sensors 111 in each row of sensors, and the physical parts of each row of pressure sensors 111 are aligned with the gap L1 of the pressure sensors 111 in the adjacent row in the width direction. That is to say, the projection of the physical part of each row of pressure sensors 111 in the Z-axis direction at least partially overlaps with the projection of the gap L1 of the pressure sensors 111 in the adjacent row in the Z-axis direction.

[0137] The following will combine Figure 7C and Figure 7D to introduce the function of arranging the pressure sensors 111 in adjacent rows offset. Among them, Figure 7C shows a schematic diagram of the positional relationship between the sensor array 110B of this embodiment and the user's wrist blood vessel 201 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 wrist blood vessel 201 in the comparative embodiment. Among them, in the comparative embodiment, the pressure sensors 111 in adjacent rows are arranged aligned.

[0138] It can be understood that when the wearable device is worn on the user's wrist, the positional relationship between the blood vessel 201 and the pressure sensor array 110B is not specific. For example, referring to Figure 7C and Figure 7D , when the wearable device is worn on the user's wrist, the blood vessel 201 may be located at position P1 or position P2 relative to the pressure sensor array 110B.

[0139] Referring to Figure 7D , since there is a gap L1 between the pressure sensors 111 in the same row, when the blood vessel 201 is at position P1, the blood vessel 201 is aligned with a certain column of pressure sensors 111. At this time, the pressure detection device 10B' can detect the user's blood pressure through this column of pressure sensors 111. However, when the blood vessel 201 is at position P2, the blood vessel 201 may be aligned with the gap between the pressure sensors 111, and there are fewer pressure sensors 111 that are not aligned with the blood vessel 201 or pressure sensors 111 that are aligned with the blood vessel 201, so the measurement accuracy of the pressure detection device 10B' will be affected.

[0140] In the embodiment of the present application, when the blood vessel 201 is located at the 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 the 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. That is to say, by arranging the pressure sensors 111 in adjacent rows in a staggered manner, the arrangement density of the pressure sensors 111 in the row direction can be increased, so that it is easier to align the blood vessel 201 with the pressure sensors 111, and the alignment accuracy requirement of the pressure detection device and the blood vessel can be reduced.

[0141] In some examples, the projection of the physical part of each row of pressure sensors 111 in the Z-axis direction can cover the projection of the gap L1 between adjacent rows of pressure sensors 111 in the Z-axis direction, so as to further increase the arrangement density of the pressure sensors 111 in the row direction and reduce the alignment accuracy requirement of the pressure detection device and the blood vessel.

[0142] Other details not described in this embodiment, for example, the structures of the flexible encapsulation layer 14B, the flexible support layer 12B, and the reinforcement layer 13B can be substantially the same as the structures of the flexible encapsulation layer 14A, the flexible support layer 12A, and the reinforcement layer 13A in the first embodiment. Therefore, the description of the first embodiment can be referred to and will not be elaborated.

[0143] In summary, in this embodiment, by arranging the pressure sensors 111 in adjacent sensors in a staggered manner, the arrangement density of the pressure sensors 111 in the row direction can be increased, thereby increasing the resolution of the pressure detection device 10B in the row direction and reducing the alignment accuracy requirement of the pressure detection device and the blood vessel.

[0144] The following introduces the third embodiment of the pressure detection device provided by the present application. This embodiment can be based on the first embodiment and the second embodiment. On the basis of the first embodiment and the second embodiment, the rigid sheets in the reinforcement layer and the pressure sensors are set in a non-one-to-one correspondence, that is, at least one rigid sheet corresponds to multiple pressure sensors. The number of rigid sheets in the reinforcement layer is less than the number of rigid sheets in the reinforcement layer in the first embodiment and the second embodiment, which can reduce the processing difficulty and cost while realizing the support and reinforcement effect on the pressure sensors.

[0145] Figure 8A and Figure 8B shows an exemplary structure of the pressure detection device 10C provided in the third embodiment of the present application. Among them, Figure 8A shows an exemplary structure one of the pressure detection device 10C provided in this embodiment, Figure 8B shows an exemplary structure two of the pressure detection device 10C provided in this embodiment.

[0146] Refer toFigure 8A and Figure 8B The pressure detection device 10C includes a flexible encapsulation layer 14C, a pressure sensor layer 11C, a flexible support layer 12C, and a reinforcement layer 13C that are stacked in sequence along the thickness direction.

[0147] The difference between this embodiment and the first and second embodiments is that the reinforcement layer 13C may include at least one rigid sheet, and the rigid sheets do not correspond to the pressure sensors one by one. That is, each rigid sheet may correspond to one pressure sensor or multiple pressure sensors. Exemplarily, each rigid sheet may correspond to some of the sensors in the pressure sensor layer 11C.

[0148] Exemplarily, referring to Figure 8A , the reinforcement layer 13C may include a rigid sheet 131C and multiple rigid sheets 132C. Among them, the rigid sheet 131C corresponds to two pressure sensors 111. That is, 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 support and reinforce the two pressure sensors 111 simultaneously. The rigid sheet 132C corresponds to one pressure sensor 111, that is, the projection of the rigid sheet 132C along the thickness direction covers the projection of one pressure sensor 111 along the thickness direction, that is, the rigid sheet 132C is used to support and reinforce one pressure sensor 111.

[0149] In some embodiments, multiple rigid sheets 131C may be provided, and / or a single 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 more than two (such as three, five, etc.) pressure sensors 111 along the thickness direction, without specific limitation.

[0150] In some embodiments, referring to Figure 8B , the reinforcement layer 13C may only include a rigid sheet 133C, and the projection of the rigid sheet 133C along the thickness direction covers the projections of all the pressure sensors 111 along the thickness direction. That is, the rigid sheet 133C is used to support and reinforce all the pressure sensors 111 simultaneously, thereby further reducing the processing difficulty.

[0151] In some embodiments, the rigid sheet 131C, the rigid sheet 132C, and the rigid sheet 133C correspond to one or more pressure sensors for reinforcement and support. The specific implementation manner is substantially the same as the specific implementation manner for reinforcement and support when the rigid sheet corresponds to the pressure sensor one by one in the first embodiment. The relevant descriptions in the first and second embodiments may be referred to and will not be elaborated here.

[0152] It can be understood that the flexible encapsulation layer 14C, the pressure sensor layer 11C, and the flexible support layer 12C in the pressure detection device 10C are substantially the same as the flexible encapsulation layer, the pressure sensor layer, and the flexible support layer in the first and second embodiments. The relevant descriptions in the first and second embodiments can be referred to and will not be elaborated here.

[0153] In summary, in this embodiment, at least one rigid sheet is provided in the reinforcing layer, and the rigid sheet and the pressure sensor are arranged in a non-one-to-one correspondence, reducing the number of rigid sheets. While achieving the support and reinforcement effect on the pressure sensor, the processing difficulty and cost can be reduced.

[0154] The following introduces the fourth embodiment of the pressure detection device provided by the present application. This embodiment can be based on the above three embodiments. On the basis of the first, second, and third embodiments, the flexible sheets of the flexible encapsulation layer and the pressure sensors are set in a non-one-to-one correspondence, that is, at least one flexible sheet corresponds to multiple pressure sensors, and the number of flexible sheets in the flexible encapsulation layer is less than the number of flexible sheets in the flexible encapsulation layer in the above three embodiments, so as to reduce the processing difficulty and cost.

[0155] Figures 9A to 9C The exemplary structure of the pressure detection device 10D provided in the fourth embodiment of the present application is shown. Among them, Figure 9A The front view of the first pressure detection device 10D is shown, Figure 9B The front view of the second pressure detection device 10D is shown, Figure 9C The front view of the third pressure detection device 10D is shown.

[0156] Refer to Figure 9A and Figure 9B , the pressure detection device 10D includes a flexible encapsulation layer 14D, a pressure sensor layer 11D, a flexible support layer 12D, and a reinforcing layer 13D that are stacked in sequence along the thickness direction.

[0157] 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 sheet and the pressure sensor are not in one-to-one correspondence. Exemplarily, refer to Figure 9A , the flexible encapsulation layer 14D may include a flexible sheet 141D and multiple flexible sheets 142D. Among them, the projection of the flexible sheet 141D along the thickness direction covers the projection 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.

[0158] In some embodiments, a plurality of flexible sheets 141D may be provided, and / or, a single flexible sheet 142D may be provided. In other embodiments, the projection of the flexible sheet 141D in the thickness direction may cover the projections of more than two (such as three, four, etc.) pressure sensors 111 in the thickness direction, without specific limitation.

[0159] In some embodiments, referring to Figure 9B , the flexible encapsulation layer 14D may only include a single flexible sheet 143D, and the projection of the flexible sheet 143D in the thickness direction covers the projections of all the pressure sensors 111 in the thickness direction.

[0160] It can be understood that the reinforcing layer 13D, the pressure sensor layer 11D, and the flexible support layer 12D in the pressure detection device 10D are substantially the same as the flexible encapsulation layer, the pressure sensor layer, and the flexible support layer in the first, second, and third embodiments, and the relevant descriptions in the first, second, and third embodiments can be referred to and will not be elaborated here.

[0161] For example, referring to Figure 9C , based on the third embodiment, in this embodiment, the flexible sheet 143D in the flexible encapsulation layer 14D corresponds to all the pressure sensors 111, and the rigid sheet 141D in the reinforcing layer 13D corresponds to all the pressure sensors 111, so as to further reduce the processing difficulty and cost.

[0162] In summary, in this embodiment, the flexible encapsulation layer is provided with at least one flexible sheet, and the flexible sheet and the pressure sensors are arranged in a non-one-to-one correspondence, reducing the number of flexible sheets and being able to reduce the processing difficulty and cost.

[0163] It should be noted that the directional terms such as "upper", "lower", "left", "right", "front", "rear", "top", and "bottom" in this article are based on the exemplary directions shown in the drawings, rather than indicating or implying that the components referred to must have a specific direction, and it can change accordingly according to actual use and should not be understood as a limitation to this application.

[0164] In the above description of this embodiment, unless otherwise specified, " / " means "or". For example, A / B may indicate A or B; the "and / or" in this article is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B may represent three situations: A exists alone, B exists alone, and A and B exist simultaneously.

Claims

1. A pressure detection device, characterized in that, comprising: a plurality of pressure sensors; a flexible support layer, the flexible support layer including a first surface and a second surface disposed opposite to each other in a first direction; the plurality of pressure sensors are spaced apart and attached to the first surface of the flexible support layer, and the plurality of pressure sensors are mechanically connected at least through the flexible support layer; one or more rigid sheets, the one or more rigid sheets being attached to the second surface of the flexible support layer; wherein each of the one or more rigid sheets corresponds to a part of the pressure sensors among the plurality of pressure sensors, and the projection of each rigid sheet in the first direction covers the projection of the corresponding pressure sensor in the first direction.

2. The pressure detection device according to claim 1, characterized in that, the number of the rigid sheets is a plurality, and the plurality of rigid sheets correspond to the plurality of pressure sensors one by one.

3. The pressure detection device according to claim 1 or 2, characterized in that, the number of the rigid sheets is a plurality, and the plurality of 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 includes a flexible encapsulation layer, and the flexible encapsulation layer is disposed on a side of the pressure sensor layer facing away from the flexible support layer; and, the projection of the flexible encapsulation layer in the first direction at least covers the projection of some of the plurality of pressure sensors in 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 disposed at intervals, and each of the one or more flexible sheets corresponds to a part of the sensors among the plurality of pressure sensors, and the projection of each flexible sheet in the first direction covers the projection of the corresponding pressure sensor in the first direction.

6. The pressure detection device according to claim 5, characterized in that, the number of the flexible sheets is a plurality, and the plurality of flexible sheets correspond to the plurality of pressure sensors one by one.

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

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

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 row or multiple 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 multiple rows, the pressure sensors in the same row are spaced apart in a second direction, and the second direction is perpendicular to the first direction; and, the pressure sensors in adjacent rows are arranged staggeredly in 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 in the first direction is less than or equal to 0.5 mm; and / or, the dimension of the pressure sensor in the second direction is less than or equal to 1 mm, the second direction being perpendicular to the first direction; and / or, the dimension of the pressure sensor in the third direction is less than or equal to 1 mm, the third direction being perpendicular to the second direction and perpendicular to 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, elastomeric compound, flexible resin, and flexible silica gel.

14. The pressure detection device according to any one of claims 1-13, 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, comprising a main body and the pressure detection device according to any one of claims 1-15, the pressure detection device being provided 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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