Flexible pressure sensor, manufacturing method thereof, and electronic device

Abstract

The present application discloses a flexible pressure sensor, a manufacturing method of the flexible pressure sensor, and an electronic device. The flexible pressure sensor includes a flexible force-sensitive sensing layer, a force-sensitive detection point layer, and conductive leads. The flexible force-sensitive sensing layer is woven from conductive yarns, and the force-sensitive detection point layer is woven from conductive yarns. The force-sensitive detection point layer is disposed above the flexible force-sensitive sensing layer, and the conductive leads are respectively connected to the flexible force-sensitive sensing layer and the force-sensitive detection point layer. Based on the flexible pressure sensor provided by the present application, the force-sensitive detection point layer is disposed above the flexible force-sensitive sensing layer, so that the detection heights of the flexible force-sensitive sensing layer and the force-sensitive detection point layer are different, thereby increasing the maximum pressure deformation value and the conductive path of the flexible pressure sensor. Compared with the technical solutions in the related art that combine conductive materials with flexible substrates by means of poor uniformity such as coating or etching, the sensitivity of the flexible pressure sensor can be effectively improved.

Description

Technical Field

[0001] The present application relates to, but is not limited to, the field of sensor technologies, and particularly relates to a flexible pressure sensor, a manufacturing method of the flexible pressure sensor, and an electronic device. Background Art

[0002] Flexible pressure sensors are widely used in fields such as medical health, sports and leisure, intelligent manufacturing, and aerospace, and health monitoring, motion monitoring, human-computer interaction, etc. are realized through flexible pressure sensors. Most traditional flexible pressure sensors are components, and the components have a large hardness and are not easy to bend, resulting in low comfort of traditional flexible pressure sensors. In related technologies, a conductive material is combined with a flexible substrate by means of coating or etching, etc., but this method cannot ensure the uniformity of the combination of the conductive material and the flexible substrate, resulting in low sensitivity of the flexible pressure sensor. Summary of the Invention

[0003] Embodiments of the present application provide a flexible pressure sensor, a manufacturing method of the flexible pressure sensor, and an electronic device, which can effectively improve the sensitivity of the flexible pressure sensor.

[0004] In a first aspect, embodiments of the present application provide a flexible pressure sensor, including:

[0005] A flexible force-sensitive sensing layer woven from conductive yarns;

[0006] A force-sensitive detection point layer woven from the conductive yarns, and the force-sensitive detection point layer is arranged above the flexible force-sensitive sensing layer;

[0007] Conductive leads respectively connected to the flexible force-sensitive sensing layer and the force-sensitive detection point layer.

[0008] The flexible pressure sensor according to the embodiment of the first aspect of the present application has at least the following beneficial effects: The flexible pressure sensor includes a flexible force-sensitive sensing layer, a force-sensitive detection point layer, and conductive leads. Among them, the flexible force-sensitive sensing layer and the force-sensitive detection point layer are woven from conductive yarns, so that the flexible pressure sensor has good ductility and resilience, and can effectively improve the comfort of the flexible pressure sensor. The force-sensitive detection point layer is arranged above the flexible force-sensitive sensing layer, and the conductive leads are respectively connected to the flexible force-sensitive sensing layer and the force-sensitive detection point layer, so that the detection heights of the flexible force-sensitive sensing layer and the force-sensitive detection point layer are different. Under the action of pressure, the force-sensitive detection point layer and the flexible force-sensitive sensing layer are deformed in sequence, which can increase the maximum pressure deformation value of the flexible pressure sensor and increase the conductive paths, and can effectively improve the sensitivity of the flexible pressure sensor. Based on the flexible pressure sensor provided by the present application, the force-sensitive detection point layer is arranged above the flexible force-sensitive sensing layer, so that the detection heights of the flexible force-sensitive sensing layer and the force-sensitive detection point layer are different, so as to increase the maximum pressure deformation value and conductive paths of the flexible pressure sensor. Compared with the technical solutions in the related art that combine conductive materials with flexible substrates by means of poor uniformity such as coating or etching, the sensitivity of the flexible pressure sensor can be effectively improved.

[0009] According to some embodiments of the first aspect of the present application, at least one of the number of lateral detection points and the number of longitudinal detection points of the force-sensitive detection point layer is greater than or equal to 2.

[0010] According to some embodiments of the first aspect of the present application, the force-sensitive detection point layer includes a first height detection point layer and a second height detection point layer, and the first height difference between the first height detection point layer and the flexible force-sensitive sensing layer is less than the second height difference between the second height detection point layer and the flexible force-sensitive sensing layer.

[0011] According to some embodiments of the first aspect of the present application, the detection points of the first height detection point layer and the detection points of the second height detection point layer are staggeredly distributed.

[0012] In a second aspect, an embodiment of the present application provides a manufacturing method of a flexible pressure sensor. The manufacturing method of the flexible pressure sensor is used to manufacture the flexible pressure sensor described in the first aspect. The manufacturing method of the flexible pressure sensor includes:

[0013] Obtain a plurality of conductive yarns and conductive leads;

[0014] Weave the plurality of conductive yarns according to a preset knitting method to obtain a flexible force-sensitive sensing layer;

[0015] Weave the plurality of conductive yarns above the flexible force-sensitive sensing layer to obtain a force-sensitive detection point layer;

[0016] Using the conductive lead wire, electrically connect the flexible force-sensitive sensing layer and the force-sensitive detection point layer to obtain a flexible pressure sensor.

[0017] According to some embodiments of the second aspect of the present application, the preset knitting method is the reverse knitting method.

[0018] According to some embodiments of the second aspect of the present application, the step of knitting a plurality of the conductive yarns above the flexible force-sensitive sensing layer to obtain a force-sensitive detection point layer includes:

[0019] Based on the flexible force-sensitive sensing layer, determine the target vertical row;

[0020] Knit a plurality of the conductive yarns above the target vertical row to obtain a first height detection point layer;

[0021] Based on the first height detection point layer, determine the target horizontal row;

[0022] Knit a plurality of the conductive yarns above the target horizontal row to obtain a second height detection point layer;

[0023] Using the conductive lead wire, electrically connect the first height detection point layer and the second height detection point layer to obtain the force-sensitive detection point layer.

[0024] According to some embodiments of the second aspect of the present application, the step of knitting a plurality of the conductive yarns above the target vertical row to obtain the first height detection point layer includes:

[0025] Adopt the front knitting method to knit a plurality of the conductive yarns above the target vertical row to obtain the first height detection point layer.

[0026] According to some embodiments of the second aspect of the present application, the step of knitting a plurality of the conductive yarns above the target horizontal row to obtain the second height detection point layer includes:

[0027] Adopt the transfer stitch cable stitch method to knit a plurality of the conductive yarns above the target horizontal row to obtain the second height detection point layer.

[0028] In a third aspect, an embodiment of the present application further provides an electronic device, including the flexible pressure sensor as described in the first aspect. Description of the Drawings

[0029] The drawings are used to provide a further understanding of the technical solutions of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solutions of the present invention and do not constitute a limitation to the technical solutions of the present invention.

[0030] Figure 1It is a schematic diagram of a module of a flexible pressure sensor provided by an embodiment of the present application;

[0031] Figure 2 It is a schematic diagram of the distribution of force-sensitive detection points of a flexible pressure sensor provided by another embodiment of the present application;

[0032] Figure 3 It is a cross-sectional schematic diagram of a flexible pressure sensor provided by another embodiment of the present application;

[0033] Figure 4 It is a step flowchart of a manufacturing method of a flexible pressure sensor provided by another embodiment of the present application;

[0034] Figure 5 It is a step flowchart of obtaining a force-sensitive detection point layer provided by another embodiment of the present application;

[0035] Figure 6 It is a step flowchart of obtaining a first height detection point layer provided by another embodiment of the present application;

[0036] Figure 7 It is a step flowchart of obtaining a second height detection point layer provided by another embodiment of the present application;

[0037] Figure 8 It is a design drawing of a flexible pressure sensor provided by another embodiment of the present application;

[0038] Figure 9 It is a comparison chart of the resistance change rate - pressure relationship curves of different flexible pressure sensors provided by another embodiment of the present application. Detailed implementation manners

[0039] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0040] It can be understood that although functional module division is performed in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order from the module division in the device or the flowchart in the flowchart. Terms such as "first" and "second" in the specification, claims or the above-mentioned drawings are used to distinguish similar objects and do not have to be used to describe a specific order or sequence.

[0041] The present application provides a flexible pressure sensor, a manufacturing method of the flexible pressure sensor, and an electronic device. The flexible pressure sensor includes: a flexible force-sensitive sensing layer, a force-sensitive detection point layer, and conductive leads. Among them, the flexible force-sensitive sensing layer and the force-sensitive detection point layer are woven from conductive yarns, so that the flexible pressure sensor has good ductility and resilience, can effectively improve the comfort of the flexible pressure sensor. The force-sensitive detection point layer is arranged above the flexible force-sensitive sensing layer, and the conductive leads are respectively connected to the flexible force-sensitive sensing layer and the force-sensitive detection point layer, so that the detection heights of the flexible force-sensitive sensing layer and the force-sensitive detection point layer are different. Under the action of pressure, the force-sensitive detection point layer and the flexible force-sensitive sensing layer are deformed in sequence, which can increase the maximum pressure deformation value of the flexible pressure sensor and increase the conductive paths, and can effectively improve the sensitivity of the flexible pressure sensor. Based on the flexible pressure sensor provided by the present application, the force-sensitive detection point layer is arranged above the flexible force-sensitive sensing layer, so that the detection heights of the flexible force-sensitive sensing layer and the force-sensitive detection point layer are different, so as to increase the maximum pressure deformation value and the conductive paths of the flexible pressure sensor. Compared with the technical solutions in the related art that combine conductive materials with flexible substrates by means of poor uniformity such as coating or etching, the sensitivity of the flexible pressure sensor can be effectively improved.

[0042] The following further elaborates on the embodiments of the present application with reference to the accompanying drawings.

[0043] Refer to Figure 1 , Figure 1 FIG. 10 is a module schematic diagram of a flexible pressure sensor provided by an embodiment of the present application. The flexible pressure sensor 100 includes:

[0044] A flexible force-sensitive sensing layer 110, which is woven from conductive yarns;

[0045] A force-sensitive detection point layer 120, which is woven from conductive yarns, and the force-sensitive detection point layer 120 is arranged above the flexible force-sensitive sensing layer 110;

[0046] Conductive leads 130, and the conductive leads 130 are respectively connected to the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120.

[0047] It should be noted that the embodiments of the present application do not limit the specific type of the conductive yarn. It can be a conductive blended yarn made of stainless steel staple fibers and polypropylene staple fibers, or a silver-plated fiber conductive yarn, or an organic composite carbon black-based conductive yarn, etc. The embodiments of the present application also do not limit the specific preparation method of the conductive yarn. It can be made by blending stainless steel staple fibers with a length of 5 cm and a diameter of 8 μm and polypropylene staple fibers with a length of 5 cm, or a conductive blended yarn made of two stainless steel staple fibers and polypropylene staple fibers can be twisted to form a ply yarn, etc. Among them, the weight blending ratio of the stainless steel staple fibers can be from 0.3 to 0.7. It can be understood that the conductive yarn is a conductive blended yarn made of stainless steel staple fibers and polypropylene staple fibers, so that the conductive yarn has both conductive performance and good elastic performance, thus ensuring the extensibility of the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120, and being able to better fit the target to be detected, so as to improve the sensitivity of the flexible pressure sensor 100. Among them, the diameter of the conductive yarn can be 0.4 mm, which can ensure the wire performance and effectively improve the extensibility and comfort of the flexible pressure sensor 100.

[0048] It should be noted that the embodiments of the present application do not limit the specific type of the conductive lead 130. It can be a conductive blended yarn made of stainless steel staple fibers and polypropylene staple fibers, or a silver-plated conductive nylon filament, or a metal wire, etc., as long as it can achieve the conductive function. It can be understood that the diameter of the conductive lead 130 can be from 0.1 mm to 0.4 mm, which can ensure the wire performance and effectively improve the comfort of the flexible pressure sensor 100.

[0049] In addition, it should be noted that the embodiments of the present application do not limit the specific number of the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120. It can be one layer or multiple layers.

[0050] It can be understood that the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120 are woven from conductive yarns, enabling the flexible pressure sensor 100 to have good ductility and resilience, so that the flexible pressure sensor 100 can better conform to the target to be detected, effectively improving the comfort of the flexible pressure sensor 100 and also enhancing the sensitivity of the flexible pressure sensor 100. The force-sensitive detection point layer 120 is arranged above the flexible force-sensitive sensing layer 110, and the conductive leads 130 are respectively connected to the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120, such that the detection heights of the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120 are different. Under the action of pressure, the force-sensitive detection point layer 120 deforms, and the contact area between the conductive yarns in the force-sensitive detection point layer 120 increases, resulting in an increase in the conductive paths in the force-sensitive detection point layer 120 and a significant decrease in resistance. The sensitivity curve of the flexible pressure sensor 100 is linear. When the pressure continues to increase, the flexible force-sensitive sensing layer 110 deforms, further increasing the conductive paths of the flexible pressure sensor 100 and ensuring the sensitivity of the flexible pressure sensor 100. Through the height difference between the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120, the force-sensitive detection point layer 120 and the flexible force-sensitive sensing layer 110 deform in sequence, which can increase the maximum pressure deformation value of the flexible pressure sensor 100 and increase the conductive paths, effectively improving the sensitivity of the flexible pressure sensor 100. At the same time, it can also extend the pressure-sensitive response range of the flexible pressure sensor 100, thereby improving the detection range and reliability of the flexible pressure sensor 100. Based on the flexible pressure sensor 100 provided in the embodiments of the present application, the force-sensitive detection point layer 120 is arranged above the flexible force-sensitive sensing layer 110, such that the detection heights of the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120 are different, forming a multi-level pressure-sensitive detection structure to increase the maximum pressure deformation value and conductive paths of the flexible pressure sensor 100. Compared with the technical solutions in the related art that combine conductive materials with flexible substrates by means of poor uniformity such as coating or etching, the sensitivity of the flexible pressure sensor 100 can be effectively improved.

[0051] Referring to Figure 2 , in some embodiments of the present application, at least one of the number of lateral detection points and the number of longitudinal detection points of the force-sensitive detection point layer 120 is greater than or equal to 2.

[0052] It should be noted that the embodiments of the present application do not limit the distribution manner of the detection points of the force-sensitive detection point layer 120, which can be evenly distributed or randomly distributed. It can be understood that the even distribution of the detection points of the force-sensitive detection point layer 120 can ensure the pressure detection stability and accuracy of the force-sensitive detection point layer 120.

[0053] It can be understood that at least one of the number of horizontal detection points and the number of vertical detection points of the force-sensitive detection point layer 120 is greater than or equal to 2, which can ensure the sensitivity of the force-sensitive detection point layer 120, thereby improving the sensitivity of the flexible pressure sensor 100.

[0054] In some embodiments of the present application, the force-sensitive detection point layer 120 includes a first height detection point layer 121 and a second height detection point layer 122. The first height difference between the first height detection point layer 121 and the flexible force-sensitive sensing layer 110 is smaller than the second height difference between the second height detection point layer 122 and the flexible force-sensitive sensing layer 110.

[0055] It should be noted that the specific values of the first height difference and the second height difference are not limited in the embodiments of the present application. The first height difference can be 0.1 mm and the second height difference can be 0.2 mm, or the first height difference can be 0.2 mm and the second height difference can be 0.3 mm, etc.

[0056] In addition, it should be noted that the specific structures of the first height detection point layer 121 and the second height detection point layer 122 are not limited in the embodiments of the present application. As Figure 3 shown, the coils of the flexible force-sensitive sensing layer 110 present a concave effect and are the pressure detection layer with the lowest height. The coils of the first height detection point layer 121 present a convex effect, making the first height detection point layer 121 higher than the flexible force-sensitive sensing layer 110. The second height detection point layer 122 is formed by two coils intersecting and overlapping above the first height detection point layer 121, making the second height detection point layer 122 higher than the first height detection point layer 121.

[0057] It can be understood that the force-sensitive detection point layer 120 includes a first height detection point layer 121 and a second height detection point layer 122. The first height difference between the first height detection point layer 121 and the flexible force-sensitive sensing layer 110 is smaller than the second height difference between the second height detection point layer 122 and the flexible force-sensitive sensing layer 110, forming a multi-level pressure-sensitive detection structure to increase the maximum pressure deformation value and conductive paths of the flexible pressure sensor 100. Under the action of pressure, the second height detection point layer 122 deforms, and the contact area between the conductive yarns in the second height detection point layer 122 increases, resulting in an increase in the conductive paths of the force-sensitive detection point layer 120 and a significant decrease in resistance. The sensitivity curve of the flexible pressure sensor 100 is linear. When the pressure continues to increase, the first height detection point layer 121 deforms, further increasing the conductive paths of the force-sensitive detection point layer 120 and ensuring the sensitivity of the flexible pressure sensor 100. Through the height difference between the first height detection point layer 121 and the second height detection point layer 122, the second height detection point layer 122 and the first height detection point layer 121 deform in sequence, which can increase the maximum pressure deformation value of the flexible pressure sensor 100 and increase the conductive paths, effectively improving the sensitivity of the flexible pressure sensor 100.

[0058] In some embodiments of the present application, the detection points of the first height detection point layer 121 and the detection points of the second height detection point layer 122 are distributed in a staggered manner.

[0059] It should be noted that the embodiments of the present application do not limit the specific distribution manner of the detection points of the first height detection point layer 121 and the detection points of the second height detection point layer 122. It can be that the detection points of the first height detection point layer 121 and the detection points of the second height detection point layer 122 are distributed in a staggered manner, or it can be that the detection points of the first height detection point layer 121 and the detection points of the second height detection point layer 122 are randomly distributed.

[0060] It can be understood that the staggered distribution of the detection points of the first height detection point layer 121 and the detection points of the second height detection point layer 122 makes the detection points of the force-sensitive detection point layer 120 evenly distributed. At the same time, the heights of adjacent force-sensitive detection points in the horizontal and vertical directions of the force-sensitive detection point layer 120 are different, which can ensure the pressure detection stability and reliability of the force-sensitive detection point layer 120.

[0061] Refer to Figure 4 , Figure 4 which is a flowchart of the steps of a manufacturing method of a flexible pressure sensor provided by another embodiment of the present application. The manufacturing method of the flexible pressure sensor is used to manufacture the above-mentioned flexible pressure sensor 100. The manufacturing method of the flexible pressure sensor includes:

[0062] Step S410, obtaining a plurality of conductive yarns and conductive leads;

[0063] Step S420: Weave a plurality of conductive yarns according to a preset knitting method to obtain a flexible force - sensitive sensing layer;

[0064] Step S430: Weave a plurality of conductive yarns above the flexible force - sensitive sensing layer to obtain a force - sensitive detection point layer;

[0065] Step S440: Use conductive leads to electrically connect the flexible force - sensitive sensing layer and the force - sensitive detection point layer to obtain a flexible pressure sensor.

[0066] It should be noted that the embodiments of the present application do not limit the specific number of conductive yarns and conductive leads 130, which can be adjusted according to actual needs. The embodiments of the present application also do not limit the specific method of weaving a plurality of conductive yarns above the flexible force - sensitive sensing layer 110. It can be introduced into the flexible force - sensitive sensing layer 110 in a way of forming a common loop, or sewn to the flexible force - sensitive sensing layer 110 by means of embroidery, etc.

[0067] It can be understood that a plurality of conductive yarns and conductive leads 130 are obtained. According to a preset knitting method, the plurality of conductive yarns are woven to obtain a flexible force - sensitive sensing layer 110. Subsequently, the plurality of conductive yarns are woven above the flexible force - sensitive sensing layer 110 to obtain a force - sensitive detection point layer 120, so that the detection heights of the flexible force - sensitive sensing layer 110 and the force - sensitive detection point layer 120 are different. Then, use conductive leads 130 to electrically connect the flexible force - sensitive sensing layer 110 and the force - sensitive detection point layer 120 to form a multi - level pressure - sensitive detection structure, and obtain a flexible pressure sensor 100, so as to increase the maximum pressure deformation value and conductive path of the flexible pressure sensor 100. Compared with the technical solutions in the related art that combine conductive materials with flexible substrates by means of coating or etching with poor uniformity, the sensitivity of the flexible pressure sensor 100 can be effectively improved.

[0068] In some embodiments of the present application, the preset knitting method is the reverse knitting method.

[0069] It should be noted that the embodiments of the present application do not limit the specific content of the knitting method, which can be the reverse knitting method or the front knitting method, etc.

[0070] It can be understood that by using the reverse knitting method to weave a plurality of conductive yarns, a flexible force - sensitive sensing layer 110 is obtained, so that the reverse plain - stitch coil rows of the flexible force - sensitive sensing layer 110 present a concave effect, forming a pressure detection layer with the lowest height. Thus, the height difference between the flexible force - sensitive sensing layer 110 and the force - sensitive detection point layer 120 is increased, the pressure - sensitive response range of the flexible pressure sensor 100 is extended, and the detection range and reliability of the flexible pressure sensor 100 are improved.

[0071] In addition, referring toFigure 5 , in one embodiment, Figure 4 The step S430 in the illustrated embodiment further includes but is not limited to the following steps:

[0072] Step S510, based on the flexible force - sensitive sensing layer, confirm the target vertical row;

[0073] Step S520, weave a plurality of conductive yarns above the target vertical row to obtain a first height detection point layer;

[0074] Step S530, based on the first height detection point layer, confirm the target horizontal row;

[0075] Step S540, weave a plurality of conductive yarns above the target horizontal row to obtain a second height detection point layer;

[0076] Step S550, use conductive leads to electrically connect the first height detection point layer and the second height detection point layer to obtain a force - sensitive detection point layer.

[0077] It should be noted that the embodiments of the present application do not limit the specific numbers of the target vertical row and the target horizontal row. It can be four target vertical rows and two target horizontal rows, or multiple target vertical rows and multiple target horizontal rows. The embodiments of the present application also do not limit the specific distribution manners of the target vertical row and the target horizontal row. They can be evenly distributed or randomly distributed. It can be understood that the even distribution of the target vertical row and the target horizontal row can make the detection points of the first height detection point layer 121 and the second height detection point layer 122 evenly distributed, so that the detection points of the force - sensitive detection point layer 120 are evenly distributed, which can ensure the pressure detection stability and accuracy of the force - sensitive detection point layer 120.

[0078] It can be understood that, based on the flexible force - sensitive sensing layer 110, the target vertical row is confirmed to facilitate weaving a plurality of conductive yarns above the target vertical row to obtain the first height detection point layer 121. Subsequently, based on the first height detection point layer 121, the target horizontal row is determined to facilitate weaving a plurality of conductive yarns above the target horizontal row to obtain the second height detection point layer 122. The obtained second height detection point layer 122 has a height difference from the first height detection point layer 121, such that the first height difference between the first height detection point layer 121 and the flexible force - sensitive sensing layer 110 is less than the second height difference between the second height detection point layer 122 and the flexible force - sensitive sensing layer 110. And there is a non - overlapping part between the first height detection point layer 121 and the second height detection point layer 122 to ensure the reliability of the subsequent obtained flexible pressure sensor 100. Then, using the conductive leads 130, the first height detection point layer 121 and the second height detection point layer 122 are electrically connected to form a multi - level pressure - sensitive detection structure to obtain the force - sensitive detection point layer 120, thereby increasing the maximum pressure deformation value and the conductive path of the flexible pressure sensor 100.

[0079] In addition, referring to Figure 6 , in one embodiment, Figure 5 step S520 in the illustrated embodiment further includes but is not limited to the following steps:

[0080] Step S610, using the right-side knitting method, knitting a plurality of conductive yarns above the target wales to obtain a first height detection point layer.

[0081] It should be noted that the embodiments of the present application do not limit the specific manner of knitting a plurality of conductive yarns above the target wales. It can be the right-side knitting method or the wrong-side knitting method, etc.

[0082] It can be understood that, using the right-side knitting method, knitting a plurality of conductive yarns above the target wales to obtain a first height detection point layer 121, so that the coils of the first height detection point layer 121 present a convex effect, thereby making the first height detection point layer 121 higher than the flexible force-sensitive sensing layer 110. The first height detection point layer 121 and the flexible force-sensitive sensing layer 110 form a concave-convex effect, which can effectively improve the sensitivity of the flexible pressure sensor 100.

[0083] In addition, referring to Figure 7 , in one embodiment, Figure 5 step S540 in the illustrated embodiment further includes but is not limited to the following steps:

[0084] Step S710, using the transfer stitch lace knitting method, knitting a plurality of conductive yarns above the target courses to obtain a second height detection point layer.

[0085] It can be understood that, using the transfer stitch lace knitting method, by overlapping the left and right two coils with each other, knitting a plurality of conductive yarns above the target courses, so that a convex point effect is formed on the first height detection point layer 121, and a plurality of convex point regions constitute the second height detection point layer 122, making the second height detection point layer 122 higher than the first height detection point layer 121.

[0086] Referring to Figure 8 , in one embodiment, the manufacturing method of the flexible pressure sensor can also be knitting using a knitting weft knitting flat knitting machine with a density of 7 needles, and the conductive yarn is selected to be a conductive yarn spun from a 5 cm long and 8 μm diameter stainless steel short fiber and a 5 cm long polypropylene short fiber, wherein the weight blending ratio of the stainless steel short fiber is 0.5.

[0087] During the weaving process, 8 knitting needles are used for each of the front and back needle beds, a total of 16 knitting needles. Among them, the 5th to 8th needles and the 13th to 16th needles knit the reverse plain stitch coil wales, forming the flexible force-sensitive sensing layer 110 with the lowest height. Subsequently, the 1st to 4th needles and the 9th to 12th needles knit the front plain stitch coil wales. Among them, the 2nd to 8th rows and the 10th to 16th rows constitute the first height detection point layer 121. For the remaining 1st row and 9th row, a four-needle transfer stitch pattern is adopted, that is, the two left needles and the two right needles cross each other to form a stitch pattern, constituting the second height detection point layer 122.

[0088] The combination of the reverse plain stitch coil wales and the front coil wales will form a concavo-convex effect. The reverse plain stitch coil wales of this flexible pressure sensor, that is, the flexible force-sensitive sensing layer 110, presents a concave effect and is the pressure detection layer with the lowest height; while the front coil wales present a convex effect and are higher than the flexible force-sensitive sensing layer 110. The transfer stitch area therein is the cross-over and superposition of two coils on the left and right, and the height is further increased, that is, the second height detection point layer 122 is formed. The remaining front coil wales area without the transfer stitch structure is the first height detection point layer 121.

[0089] The size of each detection point of the second height detection point layer 122 is 4 needles × 1 row, and the size of each detection point of the first height detection point layer 121 is 4 needles × 7 rows. The adjacent force-sensitive detection points have different heights and are evenly distributed, ensuring uniform bearing of external pressure loads, thereby effectively improving the sensitivity of the flexible pressure sensor.

[0090] Refer to Figure 9 , Figure 9 is a comparison chart of the resistance change rate-pressure relationship curves of different flexible pressure sensors. Among them, the a curve is the resistance change rate-pressure relationship curve corresponding to the flexible pressure sensor including the flexible force-sensitive sensing layer 110, the first height detection point layer 121 and the second height detection point layer 122, and the b curve is the resistance change rate-pressure relationship curve corresponding to the flexible pressure sensor with only the flexible force-sensitive sensing layer 110. The flexible pressure sensor including the flexible force-sensitive sensing layer 110, the first height detection point layer 121 and the second height detection point layer 122 has a maximum sensitivity of about 29 kPa within the pressure detection range of 0 kPa to 3.5 kPa -1 Among them, the linear detection range of the sensitivity is 0 kPa to 3 kPa, and it can also detect extremely low pressures of 0 kPa to 0.4 kPa. The pressure-sensitive response time is fast and the sensitivity is high. While the flexible pressure sensor with only the flexible force-sensitive sensing layer 110 has a maximum sensitivity of about 27 kPa within the pressure detection range of 0 to 3.5 kPa -1, wherein, only the sensitivity linear detection range of the flexible pressure sensors of the flexible force-sensitive sensing layer 110 is from 0.35 kPa to 1.4 kPa, and the detection range of the linear sensitivity is significantly weaker than that of the flexible pressure sensors including the flexible force-sensitive sensing layer 110, the first height detection point layer 121 and the second height detection point layer 122.

[0091] In one embodiment, the manufacturing method of the flexible pressure sensor can also be knitting with a weft knitting flat knitting machine with a density of 7 needles, and the conductive yarn is made of a blended yarn of stainless steel short fibers with a diameter of 0.4 mm and polypropylene short fibers, wherein the weight blending ratio of the stainless steel short fibers is 0.5.

[0092] During the weaving process, select the fifth and sixth knitting needles to knit a plain weft knitting stitch. The horizontal width is at least 8 cm and the longitudinal length is at least 8 cm to form the flexible force-sensitive sensing layer 110. The thickness of the flexible force-sensitive sensing layer 110 is a single-layer plain weft knitting conductive layer, which is the pressure detection layer with the lowest height. Subsequently, a plain weft knitting conductive layer with a size of 1 cm × 1 cm is knitted with the conductive yarn made of a blended yarn of stainless steel short fibers and polypropylene short fibers. Then, the four sides of a single 1 cm × 1 cm plain weft knitting conductive layer are sewn to the flexible force-sensitive sensing layer 110 with the conductive yarn to form the first height detection point layer 121 with a thickness of two-layer plain weft knitting conductive layers as the pressure detection layer at the first height. Then, the four sides of the two 1 cm × 1 cm plain weft knitting conductive layers overlapped up and down are sewn to the flexible force-sensitive sensing layer 110 with the conductive yarn to form the second height detection point layer 122 with a thickness of three-layer plain weft knitting conductive layers as the pressure detection layer at the second height.

[0093] In addition, an embodiment of the present application also provides an electronic device, including the above-mentioned flexible pressure sensor 100.

[0094] It should be noted that the embodiments of the present application do not limit the specific type of the electronic device, which can be a smart wearable device or a smart machine device for human-computer interaction, etc.

[0095] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0096] The above is a specific description of the preferred embodiment of the present application. However, the present application is not limited to the above-mentioned embodiments. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present application, and these equivalent deformations or substitutions are all included within the scope defined by the claims of the present application.

Claims

1. A flexible pressure sensor, characterized in that, Comprising: A flexible force - sensitive sensing layer, which is woven by conductive yarns; A force - sensitive detection point layer, which is woven by the conductive yarns, and the force - sensitive detection point layer is arranged above the flexible force - sensitive sensing layer; Conductive leads, which are respectively connected to the flexible force - sensitive sensing layer and the force - sensitive detection point layer, and the conductive leads are made of a conductive blended yarn formed by blending stainless - steel short fibers and polypropylene short fibers or silver - plated conductive nylon filaments; Wherein, the force - sensitive detection point layer includes a first height detection point layer and a second height detection point layer, the first height difference between the first height detection point layer and the flexible force - sensitive sensing layer is less than the second height difference between the second height detection point layer and the flexible force - sensitive sensing layer, and the detection points of the first height detection point layer and the detection points of the second height detection point layer are distributed in a staggered manner; Wherein, the first height detection point layer is obtained by knitting multiple conductive yarns above a target vertical row using a front - side knitting method, and the flexible force - sensitive sensing layer is obtained by knitting multiple conductive yarns in the target vertical row using a back - side knitting method, so that the combination of the first height detection point layer and the flexible force - sensitive sensing layer forms a concavo - convex effect; Wherein, the second height detection points are obtained by knitting multiple conductive yarns above a target horizontal row using a transfer - loop jacquard knitting method, so that the second height detection point layer forms a convex - point effect.

2. The flexible pressure sensor according to claim 1, wherein At least one of the number of horizontal detection points and the number of vertical detection points of the force - sensitive detection point layer is greater than or equal to 2.

3. A manufacturing method of a flexible pressure sensor, characterized in that, The manufacturing method of the flexible pressure sensor is used to manufacture the flexible pressure sensor according to any one of claims 1 to 2, and the manufacturing method of the flexible pressure sensor includes: Obtaining a plurality of conductive yarns and conductive leads; Knitting the plurality of conductive yarns according to a preset knitting method to obtain a flexible force - sensitive sensing layer; Knitting the plurality of conductive yarns above the flexible force - sensitive sensing layer to obtain a force - sensitive detection point layer; Electrically connecting the flexible force - sensitive sensing layer and the force - sensitive detection point layer using the conductive leads to obtain a flexible pressure sensor; Wherein, the preset knitting method is a back - side knitting method, the flexible force - sensitive sensing layer is obtained by knitting multiple conductive yarns in a target vertical row using the back - side knitting method, and the first height detection point layer of the force - sensitive detection point layer is obtained by knitting multiple conductive yarns above the target vertical row using a front - side knitting method, so that the combination of the first height detection point layer and the flexible force - sensitive sensing layer forms a concavo - convex effect; Wherein, the second height detection point layer of the force - sensitive detection point layer is obtained by knitting multiple conductive yarns above a target horizontal row using a transfer - loop jacquard knitting method, so that the second height detection point layer forms a convex - point effect.

4. The manufacturing method of the flexible pressure sensor according to claim 3, characterized in that, The step of knitting the plurality of conductive yarns above the flexible force - sensitive sensing layer to obtain a force - sensitive detection point layer includes: Based on the flexible force - sensitive sensing layer, confirming the target vertical row; Knitting the plurality of conductive yarns above the target vertical row to obtain a first height detection point layer; Based on the first height detection point layer, confirming the target horizontal row; Weave a plurality of the conductive yarns above the target horizontal row to obtain a second height detection point layer; Use the conductive lead to electrically connect the first height detection point layer and the second height detection point layer to obtain the force-sensitive detection point layer.

5. An electronic device, characterized in that, It includes the flexible pressure sensor according to any one of claims 1 to 2.

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