Stretchable circuit and layout method for stretchable circuit

A stretchable circuit is provided in the invention. The stretchable circuit comprises a plurality of segments. Each segment includes a plurality of sub-segments. Each sub-segment includes at least one main line, at least one secondary line, and rib lines, and in each sub-segment, the main lines and the secondary lines are electrically connected to the rib lines.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority of TW Patent Application No. 109143427 filed on Dec. 9, 2020, the entirety of which is incorporated by reference herein.

BACKGROUND OF THE INVENTION

Field of the Invention

The invention generally relates to stretchable circuit technology, and more particularly, to a stretchable circuit technology in which the main lines and secondary lines are configured in the stretchable circuit.

Description of the Related Art

As technology has progressed, the physiological signals (e.g. electrocardiography (ECG) signals, electromyography (EMG) signals, and so on) of the human body can be measured by wearable products (e.g. smart clothes, smart pants, assistive devices, and so on).

In addition, in order to reduce the difficulty of the layout of the circuit in the wearable products, stretchable materials may be used in the design of the measuring circuitry configured in these wearable products. However, in the structure of a traditional stretchable circuit designed for stretchable materials, only the stress variance between two ends of one segment of the stretchable circuit can be measured, whereas stress variances in the different sub-segments of the segment of the stretchable circuit cannot be measured. Therefore, the layout of the circuit in the wearable products cannot be designed accurately.

BRIEF SUMMARY OF THE INVENTION

A stretchable circuit and layout method for the stretchable circuit are provided to overcome the problems mentioned above.

An embodiment of the invention provides a stretchable circuit. The stretchable circuit comprises a plurality of segments. Each segment comprises a plurality of sub-segments. Each sub-segment comprises at least one main line, at least one secondary line, and rib lines, and in each sub-segment, the main lines and the secondary lines are electrically connected to the rib lines.

According to some embodiments of the invention, in each sub-segment, the widths of the main lines are greater than, equal to, or less than the widths of the secondary lines.

According to some embodiments of the invention, the main lines are configured in an inner ring and the secondary lines are configured in an outer ring, or the main lines are configured in an outer ring and the secondary lines are configured in an inner ring.

According to some embodiments of the invention, the sub-segments may all be the same size, or they may be different sizes.

According to some embodiments of the invention, the number of main lines in each sub-segment is the same or different.

According to some embodiments of the invention, the number of secondary lines in each sub-segment is the same or different.

According to some embodiments of the invention, in each sub-segment, the main line comprises a detection point for detecting the strain change or stress change in each sub-segment. According to some embodiments of the invention, the detection point is configured in a position in front of or behind a knee of the main line or configured in the rib line.

According to some embodiments of the invention, one of the segments is electrically connected to another one of the segments via a node.

According to some embodiments of the invention, the plurality of segments are arranged in serpentine line patterns, horseshoe patterns, wavy patterns or square patterns.

An embodiment of the invention provides a layout method for the stretchable circuit. The layout method for the stretchable circuit is applied to a stretchable circuit. The stretchable circuit comprises a plurality of segments, and each segment comprises a plurality of sub-segments, wherein each sub-segment comprises at least one main line, at least one secondary line, and rib lines, and in each sub-segment, the main lines and the secondary lines are electrically connected to the rib lines. The layout method for the stretchable circuit comprises the steps of obtaining strain distribution information or stress distribution information of a target area from a measurement carrier, wherein the measurement carrier is made up of the circuit structure of the stretchable circuit according to the circuit layout information stored in a layout database; adjusting the circuit layout information corresponding to the measurement carrier according to the strain distribution information or stress distribution information measured by the measurement carrier; and producing a carrier corresponding to the target area according to the adjusted circuit layout information.

Other aspects and features of the invention will become apparent to those with ordinary skill in the art upon review of the following descriptions of specific embodiments of stretchable circuit and layout method for the stretchable circuit.

DETAILED DESCRIPTION OF THE INVENTION

FIG.1is a block diagram of a stretchable circuit100according to an embodiment of the invention. The stretchable circuit100may be configured in the wearable products (e.g. smart clothes, smart pants, assistive devices, or protective clothing, but the invention should not be limited thereto). As shown inFIG.1, the stretchable circuit100may comprise at least one first segment S1. It should be noted thatFIG.1presents a simplified block diagram in which only the elements relevant to the invention are shown. However, the invention should not be limited to what is shown inFIG.1. The stretchable circuit100may also comprise other segments or other lines and elements.

According to the embodiments of the invention, the stretchable circuit100may be made of stretchable materials (e.g. silver paste, carbon paste, copper foil, but the invention should not be limited thereto). According to an embodiment of the invention, each segment of the stretchable circuit100may be arranged in a serpentine line pattern, a horseshoe pattern, a wavy pattern, or a square pattern, but the invention should not be limited thereto. According to an embodiment of the invention, the design parameters of the stretchable circuit100may comprise the widths of the main lines, the secondary lines and the rib lines, the lengths of the main lines, the secondary lines and the rib lines, the number of main lines and secondary lines, the arc angles of the main lines and the secondary lines, the distance between the main lines and the secondary lines, and the centerline radius, but the invention should not be limited thereto. According to an embodiment of the invention, the extension direction of each segment of the stretchable circuit100is the X-direction.

As shown inFIG.1, the first segment S1may comprise a first sub-segment S11, a second sub-segment S12, a third sub-segment S13, a fourth sub-segment S14, a fifth sub-segment S15, a sixth sub-segment S16, a first endpoint A, and a second endpoint B. It should be noted that the first segment S1ofFIG.1is only used to illustrate the embodiments of the invention, and the invention should not be limited thereto. Each segment may also comprise a different number of sub-segments.

According to an embodiment of the invention, each sub-segment may comprise at least one main line, at least one secondary line, and two rib lines. In an embodiment of the invention, the main lines may be configured in the inner ring of the sub-segment, and the secondary lines may be configured in the outer ring of the sub-segment. In another embodiment of the invention, the secondary lines may be configured in the inner ring of the sub-segment, and the main lines may be configured in the outer ring of the sub-segment. In addition, the main lines of the secondary lines in each sub-segment may be electrically connected to the two rib lines. Taking first sub-segment S11ofFIG.1as an example, the sub-segment S11may comprise a main line LM, a first secondary line LS1, a second secondary line LS2, a third secondary line LS3, a first rib line LR1and a second rib line LR2. As shown inFIG.1, the main line LMis configured in the innermost ring of the sub-segment S11, and the first secondary line LS1, the second secondary line LS2, and the third secondary line LS3are configured in the outer ring of the sub-segment S11, but the invention should not be limited thereto. In addition, as shown inFIG.1, the two ends of the main line LM, the first secondary line LS1, the second secondary line LS2, and the third secondary line LS3are electrically connected to the first rib line LR1and the second rib line LR2respectively. It should be noted that the number of main lines and secondary lines in each sub-segment is not limited to what is depicted inFIG.1. In the embodiments of the invention, the secondary lines of each sub-segment may compensate for the electrical properties of each sub-segment to ensure that the two ends of the sub-segment have stable resistivity. Therefore, in the embodiments of the invention, the strain change or stress change in each sub-segment can be detected to provide stress information that corresponds to each sub-segment. Details are illustrated in the embodiments below.

According to an embodiment of the invention, in each sub-segment, the widths of all main lines may be greater than, equal to, or less than the widths of the secondary lines. Taking the sub-segment S11of claim1as an example, the width of the main line LMis greater than the widths of the first secondary line LS1, the second secondary line LS2and the third secondary line LS3. According to an embodiment of the invention, when a sub-segment comprises more than one main line, the width of each main line may be the same or different. According to an embodiment of the invention, when a sub-segment comprises more than one secondary line, the width of each secondary line may be the same or different.

According to an embodiment of the invention, the size or arc angle of each sub-segment may be the same or different. In addition, according to an embodiment of the invention, the number of main lines and secondary lines in each sub-segment may be the same or different. As shown inFIG.2, the sub-segments of the segment S2may be different sizes. In addition, as shown inFIG.2, each of the sub-segments of the segment S2may have a different number of main lines and secondary lines. It should be noted that the segment S2ofFIG.2is only used to illustrate the embodiments of the invention, and the invention should not be limited thereto.

According to an embodiment of the invention, in each sub-segment, each main line may comprise a detection point which is used to detect the resistance change of each sub-segment to obtain the strain change or the stress change in each sub-segment. TakingFIG.1andFIG.3as an example, a detection point C is configured in the first sub-segment S11, a detection point D is configured in the second sub-segment S12, a detection point E is configured in the third sub-segment S13, a detection point F is configured in the fourth sub-segment S14, a detection point G is configured in the fifth sub-segment S15, and a detection point H is configured in the sixth sub-segment S16. In the embodiment, a detection circuit (not shown in figures) may be used to detect the stress value between the detection point A pulled from the first endpoint A and the detection point C to obtain the strain change or stress change of the first sub-segment S11, detect the stress value between the detection point A pulled from the first endpoint A and the detection point D to obtain the strain change or stress change of the second sub-segment S12, detect the stress value between the detection point A pulled from the first endpoint A and the detection point E to obtain the strain change or stress change of the third sub-segment S13, detect the stress value between the detection point A pulled from the first endpoint A and the detection point F to obtain the strain change or stress change of the fourth sub-segment S14, detect the stress value between the detection point A pulled from the first endpoint A and the detection point G to obtain the strain change or stress change of the fifth sub-segment S15, and detect the stress value between the detection point A pulled from the first endpoint A and the detection point H to obtain the strain change or stress change of the sixth sub-segment S16. In addition, in the embodiment of the invention, in each sub-segment, the detection point is configured in the position in front of or behind the knee (the area with the largest stress) of the main line. In another embodiment, the detection point is configured in the rib line. In the embodiment ofFIG.3, according to the obtained strain change or the stress change of different sub-segments of the first segment S1, the force distribution of the different sub-segments of the first segment S1will be known. TakingFIG.4as an example, if the first segment S1is configured in the clothes or protective clothing of the arm of the user, according to the obtained strain change or the stress change of different sub-segments of the first segment S1, the force distribution of the different sub-segments of the first segment S1will be known and is taken as reference for the circuit layout.

According to an embodiment of the invention, when the stretchable circuit100comprises a plurality of segments, a segment can be coupled to (or electrically connected to) another segment of the stretchable circuit100via a node to reduce the strain value or the stress value generated at the junction of the two segments when the stretchable circuit100is extended. TakingFIG.5as an example, the stretchable circuit100may further comprise a third segment S3. The endpoint B of the segment S1may be coupled to one end of the segment S3via the node N. In addition, in the embodiment, the endpoint A of the segment S1may be also coupled to another segment of the stretchable circuit100or coupled to an electrode or conducting wire via another node, and the other end of the segment S3may be also coupled to another segment of the stretchable circuit100or coupled to an electrode or conducting wire via another node. According to an embodiment of the invention, for the layout of the node N, the node N can be a round dot.

FIG.6is a flow chart illustrating a layout method for a stretchable circuit according to an embodiment of the invention. The layout method for a stretchable circuit can be applied to the stretchable circuit100. As shown inFIG.6, in step S610, the strain distribution information or the stress distribution information of a target area (e.g. the arm of the user, but the invention should not be limited thereto) is obtained from a measurement carrier (e.g. a smart clothes), wherein the measurement carrier is made up of the circuit structure of stretchable circuit100according to the circuit layout information stored in a layout database.

According to embodiments of the invention, the layout database may store the circuit layout information corresponding to different strain distribution information or stress distribution information. The circuit layout information may comprise the circuit layout of the stretchable circuit100, the layout of the electrodes, the layout of the conducting wire, and so on.

In step S620, the circuit layout information that corresponds to the measurement carrier is adjusted according to the strain distribution information or stress distribution information measured by the measurement carrier. According to the embodiments of the invention, the adjusted circuit layout information may be stored in the layout database.

In step S630, according to the adjusted circuit layout information, a carrier corresponding to the target area is produced.

In step S640, when the stretchable circuit of the produced carrier is deformed, the resistance change of the stretchable circuit is detected immediately, or the strain change or the stress change of a sub-segment of the stretchable circuit is detected according to the resistance change or impedance change of one or more detection points of the stretchable circuit.

According to the embodiments of the invention, the layout method for a stretchable circuit may be performed through a circuit layout platform.

According to the layout method for a stretchable circuit provided in the invention, in the structure of the stretchable circuit100, the strain distribution information or stress distribution information of each sub-segment can be obtained for reference of designing the circuit layout.

Use of ordinal terms such as “first”, “second”, “third”, etc., in the disclosure and claims is for description. It does not by itself connote any order or relationship.

The above paragraphs describe many aspects. Obviously, the teaching of the invention can be accomplished by many methods, and any specific configurations or functions in the disclosed embodiments only present a representative condition. Those who are skilled in this technology will understand that all of the disclosed aspects in the invention can be applied independently or be incorporated.

While the invention has been described by way of example and in terms of preferred embodiment, it should be understood that the invention is not limited thereto. Those who are skilled in this technology can still make various alterations and modifications without departing from the scope and spirit of this invention. Therefore, the scope of the present invention shall be defined and protected by the following claims and their equivalents.