Flexible display device, retractable circuit board and manufacturing method thereof

Abstract

A stretchable circuit board includes a flexible circuit substrate and two telescopic components. The flexible circuit substrate includes a flexible portion and two adjusting portions, wherein the two adjusting portions are located at opposite ends of the flexible portion, and two grooves are formed between the flexible portion and the two adjusting portions. The two telescopic components are respectively disposed in the two grooves, and each of the two telescopic components includes a fixing member, a fixing end, and an elastic member. The fixing member is fixed to one of the adjusting portions and located within one of the two grooves. The fixing end is located within a first bend in one of the adjusting portions. The elastic member is fixed to the fixing member and located between the fixing end and the fixing member. When the flexible portion is stretched or bent, the telescopic components drive the two adjusting portions, causing the fixing member of each of the two telescopic components to move along the corresponding groove in a direction away from the flexible portion, and compressing the elastic member. In this way, the compatibility of the stretchable circuit board with other electronic devices can be improved, and wrinkles in the stretchable circuit board can be reduced or avoided.

Description

Technical Field

[0001] This application relates to a display device, a retractable circuit board, and a method for manufacturing the same, and more particularly to a flexible and retractable display device, a retractable circuit board, and a method for manufacturing the same. Background Technology

[0002] With the booming development of the technology industry, flexible printed circuit boards (FPCs) have become an indispensable component in electronic devices such as smartphones, laptops, tablets, and smartwatches. However, FPCs lack sufficient flexibility. When FPCs are combined with other electronic devices to achieve folding or bending, length and space often need to be reserved at the folding or bending points, which not only hinders the internal space configuration of the electronic device but also reduces the assembly freedom of the FPC. Summary of the Invention

[0003] Therefore, this application provides a stretchable circuit board, comprising: a flexible circuit substrate and two telescopic components. The flexible circuit substrate includes: a flexural portion and two adjusting portions, wherein the two adjusting portions are respectively located at both ends of the flexural portion, and two grooves are formed between the flexural portion and the two adjusting portions. The two telescopic components are respectively disposed in the two grooves, wherein each of the two telescopic components includes a fixing member, a fixing end, and an elastic member. The fixing member is fixed to one of the adjusting portions and located within one of the two grooves. The fixing end is located within a first bend in one of the adjusting portions. The elastic member is fixed to the fixing member and located between the fixing end and the fixing member. Wherein, when the flexural portion is stretched or bent, the two telescopic components drive the two adjusting portions, so that the fixing member of each of the two telescopic components moves along the corresponding one of the two grooves in a direction away from the flexural portion, and compresses the elastic member.

[0004] According to the retractable circuit board of this application, each of the two retractable components further includes a support member, which is disposed around the lower part of one of the two slides.

[0005] According to the stretchable circuit board of this application, the flexible circuit substrate further includes: a first conductor layer and a second conductor layer, wherein the first conductor layer is disposed on the lower surface of the flexural portion, and the second conductor layer is disposed on a portion surface of the second bend of the two adjustment portions.

[0006] The retractable circuit board according to this application also includes a plurality of circuit elements, wherein the plurality of circuit elements are disposed on a second conductor layer.

[0007] According to the retractable circuit board of this application, each of the two retractable components further includes a first sliding piece, which is fixed above the top surface of the fixing member, and the area of ​​the first sliding piece is larger than the area of ​​the top surface of the fixing member.

[0008] According to the retractable circuit board of this application, each of the retractable components further includes a second slide plate, which is disposed around one of the two slide grooves.

[0009] This application provides a flexible display device, comprising: a hinge structure, a flexible circuit substrate, and two telescopic components. The flexible circuit substrate includes: a flexible portion and two adjusting portions, wherein the flexible portion and the two adjusting portions form an accommodating space, and two sliding grooves are formed between the flexible portion and the two adjusting portions respectively. The two telescopic components are respectively disposed in the two sliding grooves, wherein each of the two telescopic components includes: a fixing member, a fixing end, and an elastic member. A fixing member is fixed to one of the two adjusting parts and located within one of the two sliding grooves; a fixing end is located within the first bend of one of the two adjusting parts; an elastic member is fixed to the fixing member and located between the fixing end and the fixing member; wherein, a hinge structure is attached to a portion of the lower surface of the two adjusting parts so that the hinge structure can straighten or bend along with the two adjusting parts; when the flexible display device is bent, the two telescopic components drive the two adjusting parts so that the fixing member of each of the two telescopic components moves along the corresponding one of the two sliding grooves in a direction away from the flexural part and compresses the elastic member, wherein the hinge structure bends synchronously with the two adjusting parts so that the hinge structure is accommodated in the accommodating space.

[0010] According to the flexible display device of this application, the flexible circuit substrate further includes: a first conductor layer and a second conductor layer. The first conductor layer is disposed on the lower surface of the flexed portion. The second conductor layer is disposed on a portion of the second bend of the two adjusting portions, and the second conductor layer includes a plurality of circuit elements.

[0011] According to the flexible display device of this application, each of the two telescopic components further includes: a first slider and a second slider. The first slider is fixed above the top surface of the fixing member, and the area of ​​the first slider is larger than the area of ​​the top surface of the fixing member. The second slider is disposed around one of the two sliding grooves.

[0012] This application provides a method for manufacturing a stretchable circuit board, comprising: providing a flexible substrate, wherein two fixing members and a circuit layer are formed on the flexible substrate; performing a first bending step on both ends of the flexible substrate to form two first bends at each end; after forming the two first bends, forming two grooves on the flexible substrate, such that the flexural portion and both ends of the flexible substrate are separated by the two grooves; fixing two elastic members to the two fixing members respectively; fixing two fixed ends to the two elastic members respectively; performing a second bending step on both ends of the flexible substrate, bending the two ends toward the flexural portion, such that the two fixing members are inserted into the two grooves respectively, thereby forming two first bends and two second bends; and attaching two sliding pieces to the top surface of the two grooves around the perimeter.

[0013] The method according to this application further includes: attaching a plurality of circuit elements to the surfaces of two first bends at both ends. Attached Figure Description

[0014] To make the above features, advantages, and embodiments of this application more readily understood, the accompanying drawings are described below:

[0015] Figure 1A and Figure 1B A top view and a view along some embodiments of the retractable circuit board illustrated in this application. Figure 1A The cross-sectional view of the stretchable circuit board obtained by drawing line A-A' is shown in the figure.

[0016] Figure 2 This is a schematic diagram illustrating a stretchable circuit board in a stretched state according to some embodiments of this application;

[0017] Figure 3 This is a schematic diagram illustrating a flexible display device according to some embodiments of this application;

[0018] Figures 4A to 4C This is a schematic diagram of a flexible display device in a bent state, and its left and right side views, illustrated according to some embodiments of this application.

[0019] Figure 5 A flowchart illustrating a method for manufacturing a retractable circuit board according to some embodiments of this application; and

[0020] Figures 6A to 6H Drawing through Figure 5 Cross-sectional views of the stretchable circuit board manufactured by the manufacturing method at various manufacturing stages. Detailed Implementation

[0021] The following application provides numerous different embodiments or examples for implementing various features of the provided subject matter. Specific examples of components and configurations are described below to simplify this application. Of course, these are merely examples and are not intended to be limiting. For example, in the following description, a first feature is formed on or above a second feature, which may include embodiments where the first and second features are in direct contact, and may also include embodiments where an additional feature may be formed between the first and second features such that the first and second features are not in direct contact. Furthermore, reference numerals and / or words may be repeated in various examples. This repetition is for simplicity and clarity and does not in itself limit the relationship between the various embodiments and / or components discussed.

[0022] Please refer to Figure 1A and Figure 1B , Figure 1A and Figure 1BA top view and a view along some embodiments of the retractable circuit board 100 illustrated in this application. Figure 1A The cross-sectional view of the stretchable circuit board 100 obtained by drawing line A-A' is shown in the figure. Figure 1B As shown, the stretchable circuit board 100 includes a flexible circuit substrate 110 and two telescopic components 120. The flexible circuit substrate 110 can be bent, and the two telescopic components 120 are disposed on the flexible circuit substrate 110 and can drive the flexible circuit substrate 110 to stretch to the left and right respectively, thus realizing the stretchability and bendability of the stretchable circuit board 100.

[0023] The flexible circuit substrate 110 includes a flexural portion 111, two adjusting portions 112, and at least two circuit layers 113. Two grooves 114 are formed between the flexural portion 111 and the two adjusting portions 112, providing lateral movement margin for the two adjusting portions 112. The two adjusting portions 112 are located at opposite ends of the flexural portion 111 and each has a two-layer bending structure (e.g., ...). Figure 1B As shown, each of the two adjustment parts 112 has a first layer of bending 112a and a second layer of bending 112b, and the second layer of bending 112b of the two adjustment parts 112 can be fixedly bonded by the adhesive layer 115.

[0024] These wiring layers 113 are respectively disposed on the lower surface of the flexure portion 111 and a portion of the second layer bend 112b of the two adjustment portions 112 to form a wiring network that provides current flow and realizes electrical connection between circuit elements 116 (e.g., connectors, capacitors, inductors, transistors, resistors and diodes, etc.), wherein the circuit elements 116 may be disposed on the wiring layers 113 on a portion of the second layer bend 112b.

[0025] In some embodiments, the two adjusting portions 112 may have more layers of bending, and the layers may be bonded together by an adhesive layer 115; however, this application is not limited thereto. In some embodiments, the flexible circuit substrate 110 may be substantially a single-sided circuit board, a double-sided circuit board, or a multi-layer circuit board; this application is not limited thereto. In some embodiments, the flexural portion 111 is designed as a flexible single-sided circuit board, which is beneficial for increasing the number of dynamic bending cycles of the stretchable circuit board 100.

[0026] In the following text, since the two telescopic components 120 are respectively disposed in the two sliding grooves 114, and the two may have similar or identical structures, this document will only describe the structure of one telescopic component 120 in detail, while the other telescopic component 120 will not be described in detail. In the embodiments of this application, one telescopic component 120 includes a fixing member 121, a fixing end 122, and an elastic member 123. That is to say, Figure 1BThe retractable circuit board 100 has two telescopic components 120, representing a total of two fasteners 121, two fixed ends 122, and two elastic elements 123.

[0027] by Figure 1B The telescopic assembly 120 located on the left side is illustrated as an example. Its fixing member 121 is fixed to the left adjustment portion 112 and located within the left slide groove 114. Its fixing end 122 is located within the first bend 112a of the left adjustment portion 112. The fixing end 122 can be a metal or non-metal pulley or a stop, which is not limited to this application. Its elastic member 123 is fixed to the fixing member 121 and located between the fixing end 122 and the fixing member 121. The elastic member 123 can be stretched or compressed, and can be, for example, a spring or elastic rubber, which is not limited to this application. The telescopic assembly 120 located on the right side has the same configuration as the telescopic assembly 120 on the left side, and will not be described in detail. Specifically, the fixing members 121 of the two telescopic components 120 can drive the two adjusting parts 112 to move in the sliding grooves 114 on both sides. When the two fixing members 121 move towards their respective fixed ends 122, the two elastic members 123 will be compressed by the fixing members 121 and fixed ends 122 on their respective sides, thus allowing the two fixing members 121 to move laterally (e.g., horizontally) in the sliding grooves 114 on both sides.

[0028] In some embodiments, the telescopic assembly 120 further includes a plurality of sliders, for example Figure 1B The diagram shows a first slider 124a and a second slider 124b. The first slider 124a is fixed above the top surface of the fixing member 121, wherein the area of ​​the first slider 124a is larger than the area of ​​the top surface of the fixing member 121, and the first slider 124a does not extend beyond the outer edge of the second slider 124b. Thus, the second slider 124b and the slide groove 114 can restrict the sliding of the retractable circuit board 100 and prevent the first slider 124a from falling off the upper side of the fixing member 121. The second slider 124b is disposed around the upper side of the slide groove 114 and can serve as a track for the first slider 124a to slide on, so that the first slider 124a can slide on the second slider 124b when the retractable circuit board 100 is extended, retracted, or bent.

[0029] In some embodiments, the first slider 124a and the second slider 124b further include an adhesive layer, which can bond the first slider 124a and the second slider 124b to the fixing member 121 and the area around the slide groove 114, respectively. The second slider 124b can cover a portion of the flexible circuit substrate 110 and the adjusting portion 112. In some embodiments, the telescopic assembly 120 further includes a support member 125 disposed below and around the slide groove 114. The shape of the support member 125 can be similar to or the same as the shape of the second slider 124b, and the support member 125 can overlap the second slider 124b. The support member 125 can strengthen the support around the slide groove 114, preventing the telescopic circuit board 100 from tearing or being damaged when stretched or bent.

[0030] Please refer to Figure 2 , Figure 2 This is a schematic diagram illustrating a stretchable circuit board 100 in a stretched state according to some embodiments of this application. When the flexible circuit substrate 110 is stretched, the telescopic assembly 120 drives the adjusting portion 112 to move along the slide groove 114 away from the flexural portion 111 via the fixing member 121, causing the elastic member 123 to be compressed by the fixing end 122 and the fixing member 121, thus generating a stretching length L between the fixing member 121 and the flexural portion 111. Based on the varying stretching length L of the adjusting portions 112 at both ends, not only is the application flexibility of the stretchable circuit board 100 improved, but the assembly freedom of the stretchable circuit board 100 with other devices is also enhanced.

[0031] Please refer to Figure 3 , Figure 3 This is a schematic diagram illustrating a flexible display device 200 according to some embodiments of this application. The flexible display device 200 includes a flexible circuit substrate 210, two telescopic components 220, and a hinge structure 230. The flexible circuit substrate 210 can flatten or bend with the movement of the hinge structure 230. The two telescopic components 220 provide stretch margins at the left and right ends of the flexible circuit substrate 210, improving the fit between the flexible circuit substrate 210 and the hinge structure 230, allowing the flexible circuit substrate 210 to fit close to the hinge structure 230, reducing or avoiding wrinkles in the flexible circuit substrate 210. Furthermore, the flexible circuit substrate 210 and the two telescopic components 220 may be similar to or the same as the flexible circuit substrate 110 and the two telescopic components 120 of the retractable circuit board 100, therefore, related details will not be repeated below.

[0032] A flexible circuit substrate 110, similar to or identical to the stretchable circuit board 100, includes a flexural portion 211, two adjusting portions 212, and at least two circuit layers 213, wherein the flexural portion 211 and the two adjusting portions 212 form an accommodating space S. The two ends of the flexural portion 211 are separated from the two adjusting portions 212 by two grooves 214, which provide lateral movement margin for the two adjusting portions 212.

[0033] The two adjustment portions 212 each have a first bend 212a and a second bend 212b, and the second bend 212b of the adjustment portion 212 can be fixed by adhesive layer 215. These two circuit layers 213 are respectively disposed on the lower surface of the flexible portion 211 and a portion of the surface of the second bend 212b of the two adjustment portions 212, enabling electrical connection between circuit elements 216. The circuit elements 216 are disposed on the circuit layers 213 on the partial surface of the second bend 212b. In some embodiments, the two adjustment portions 212 may have more bends, and the layers can be bonded together by adhesive layer 215. Furthermore, in some embodiments, the flexible portion 211 is designed as a flexible single-sided circuit board, which is beneficial for increasing the dynamic bending number of the flexible display device 200.

[0034] Similar to or identical to the telescopic assembly 120 of the telescopic circuit board 100, each telescopic assembly 220 includes a fixing member 221, a fixed end 222, and an elastic member 223. The fixing member 221 is fixed to the adjusting portion 212 and located within the slide groove 214. The fixed end 222 is located within the first bend 212a of the adjusting portion 212, wherein the fixed end 222 may be a metal or non-metal pulley, or a stop, which is not limited thereto. The elastic member 223 is fixed to the fixing member 221 and located between the fixed end 222 and the fixing member 221, wherein the elastic member 223 can be stretched or compressed, and is, for example, a spring or elastic rubber, which is not limited thereto.

[0035] In some embodiments, the telescopic assembly 220 further includes a first slider 224a and a second slider 224b. The first slider 224a is fixed above the top surface of the fixing member 221, wherein the area of ​​the first slider 224a is larger than the area of ​​the top surface of the fixing member 221, and the first slider 224a does not extend beyond the outer edge of the second slider 224b. This restricts the sliding of the flexible display device 200 and prevents the first slider 224a from falling off the upper side of the fixing member 221.

[0036] The second slider 224b is disposed around the upper side of the slide groove 214 and serves as a track for the first slider 224a to slide on. Thus, when the flexible display device 200 is extended, retracted, or bent, the first slider 224a can slide on the second slider 224b. In some embodiments, the first slider 224a and the second slider 224b further include an adhesive layer for bonding the first slider 224a and the second slider 224b to the fixing member 221 and around the slide groove 214, respectively.

[0037] In some embodiments, the telescopic assembly 220 further includes a support member 225 disposed below and around the slide groove 214 to reinforce the support around the slide groove 214 and prevent the flexible display device 200 from tearing or being damaged when stretched or bent. The support member 225 may have a shape similar to or the same as the shape of the second slide piece 224b, and the support member 225 may overlap with the second slide piece 224b.

[0038] Please refer to Figures 4A to 4C , Figures 4A to 4C This is a schematic diagram and side views of the flexible display device 200 in a bent state, according to some embodiments of this application. When the flexible display device 200 is bent, the telescopic component 220 drives the adjusting part 212 to move along the slide groove 214 away from the flexural part 211 via the fixing member 221. This causes the elastic member 223 to be compressed by the fixing end 222 and the fixing member 221, thus generating a tensile length L between the fixing member 221 and the flexural part 211. The hinge structure 230 moves synchronously with the two adjusting parts 212 so that the hinge structure 230 is accommodated in the accommodating space S. By varying the tensile length L of the adjusting parts 212 at both ends, not only is the application flexibility of the flexible display device 200 improved, but the assembly freedom of the flexible display device 200 and the hinge structure 230 is also enhanced.

[0039] Please refer to Figure 5 , Figure 5 This is a flowchart illustrating a method 300 for manufacturing a retractable circuit board according to some embodiments of this application. The manufacturing method 300 can be achieved through... Figure 1B The retractable circuit board 100 shown Figure 3 This can be achieved using the components of the flexible display device 200 shown, or through a similar architecture capable of achieving similar functionality. In the following text, Figure 5 Manufacturing method 300 combined Figure 1B Scalable circuit board 100 and Figures 6A to 6H To explain, among which Figures 6A to 6H Drawing through Figure 5 Cross-sectional views of the retractable circuit board 100 manufactured by manufacturing method 300 at various manufacturing stages.

[0040] It should be understood that manufacturing method 300 is a non-limiting example. Although this document only briefly describes some operations, in fact... Figure 5 Other additional operations may be included before, during, or after the manufacturing method 300. Furthermore, the order of operations provided by the manufacturing method 300 is not intended to be restrictive; in fact, some operations may be performed in a different order, and some additional operations may be appropriately modified.

[0041] Manufacturing method 300 includes steps 301 to 307. See also... Figure 5 and Figure 6A In step 301, a flexible substrate 110' is first provided, wherein a metal layer 106, such as a copper layer, may be formed on the surface (e.g., the lower surface) of the flexible substrate 110'. See also... Figure 5 and Figure 6B Next, two fasteners 121 and a circuit layer 113 can be formed on the flexible substrate 110'. Figure 6B In the illustrated embodiment, the circuit layer 113 can be formed using the metal layer 106. For example, the metal layer 106 can serve as a seed layer for electroplating, enabling the circuit layer 113 to be formed using a semi-additive process. Alternatively, the circuit layer 113 can also be formed using a subtractive process, i.e., the circuit layer 113 can be formed by photolithography and etching of the metal layer 106.

[0042] In this embodiment, the manufacturing method 300 may further include forming an insulating layer (not shown) between the flexible substrate 110' and the circuit layer 113, and forming a protective layer 117 covering the circuit layer 113 to achieve protection and insulation, wherein the protective layer 117 may be a cover layer. After forming the circuit layer 113, the manufacturing method 300 may further include forming a surface treatment layer 118 on the circuit layer 113, wherein various circuit elements 116 (e.g., connectors, capacitors, inductors, transistors, resistors, and diodes, etc.) can be bonded on the surface treatment layer 118 to achieve electrical conduction of the stretchable circuit board 100. In some embodiments, the fastener 121 may be obtained by electroplating or thick copper etching.

[0043] Please see Figure 5 and Figure 6C In step 302, a first bending step is performed on both ends of the flexible substrate 110' to form two bends, namely two second-layer bends 112b, at each end. Each end portion has opposite sides of the flexible substrate 110', and the overlapping sections of the second-layer bends 112b can be bonded together by an adhesive layer 115. Furthermore, in subsequent processes, two adjustment portions 112 will be formed at each of the aforementioned ends.

[0044] Please see Figure 5 and Figure 6D In step 303, after forming two bends (i.e., the second bend 112b), two grooves 114 are formed on the flexible substrate 110' by processes such as die stamping or laser groove forming, so that the flexible substrate 110's flexural portion 111 and its two ends are separated by the two grooves 114 respectively. In some embodiments, the flexural portion 111 is designed as a flexible single-sided circuit board, which is beneficial to increasing the number of dynamic bends of the stretchable circuit board 100.

[0045] Please see Figure 5and Figure 6E In step 304, the two elastic members 123 are respectively fixed to the two fixing members 121. The elastic members 123 can be stretched or compressed, and are, for example, springs or elastic rubber, etc., which are not limited thereto. In addition, the manufacturing method 300 may also include providing a support member 125 around the lower part of the slide 114. The support member 125 can strengthen the support around the slide 114 and prevent the retractable circuit board 100 from tearing or being damaged when stretched or bent.

[0046] Please see Figure 5 and Figure 6F In step 305, the two fixed ends 122 are respectively fixed to the two elastic members 123. The fixed ends 122 can be metal or non-metal pulleys or stops, and this application is not limited thereto.

[0047] Please see Figure 5 and Figure 6G In step 306, a second bending step is performed on both ends of the flexible substrate 110', bending both ends toward the flexural portion 111, so that the two fixing members 121 are respectively inserted into the two sliding grooves 114, thereby forming an adjustment portion 112 having a first layer of bending 112a and a second layer of bending 112b, and a flexible circuit substrate 110 including the flexural portion 111, the two adjustment portions 112, and at least two circuit layers 113. In some embodiments, the two ends may have more layers of bending, and the layers may be bonded together by an adhesive layer 115, which is not limited to this application.

[0048] Please see Figure 5 and Figure 6H In step 307, the two sliding pieces, namely the second sliding piece 124b, are attached to the top surface of the two sliding grooves 114. At this point, the retractable circuit board 100 (symbol indicated in...) is complete. Figure 1B The process is essentially complete. In some embodiments, manufacturing method 300 further includes fixing two sliders, namely the first slider 124a, above the top surface of the fixing member 121. In some embodiments, manufacturing method 300 further includes attaching a plurality of circuit elements 116 to the wiring layer 113 on the surface of the two second layer bends 112b portions of the two adjustment portions 112.

[0049] In an embodiment of this application, the second sliding piece 124b is disposed around the upper side of the sliding groove 114 and serves as a track for the first sliding piece 124a to slide on, so that the first sliding piece 124a can slide on the second sliding piece 124b when the retractable circuit board 100 is extended, retracted, or bent. In an embodiment of this application, the area of ​​the first sliding piece 124a is larger than the top surface area of ​​the fixing member 121, and the first sliding piece 124a does not extend beyond the outer edge of the second sliding piece 124b. Thus, the second sliding piece 124b and the sliding groove 114 can restrict the sliding of the retractable circuit board 100 and prevent the first sliding piece 224a from falling off the upper side of the fixing member 121.

[0050] This application provides a flexible display device, a retractable circuit board, and a method for manufacturing the retractable circuit board. By incorporating a telescopic component and a sliding groove, it provides lateral movement margin for the flexible circuit board, enabling it to extend, retract, and bend. This addresses the issue that existing flexible circuit boards, when combined with hinge structures or applied to electronic devices, require reserved length and space at folds or bends to conformally accommodate within the electronic device during bending. In summary, the flexible display device, retractable circuit board, and method for manufacturing the retractable circuit board of this application not only improve the application flexibility of flexible circuit boards but also enhance their assembly freedom.

[0051] Although this application has been disclosed above with reference to embodiments, it is not intended to limit this application. Any person skilled in the art can make various modifications and refinements without departing from the spirit and scope of this application. Therefore, the scope of protection of this application shall be determined by the content defined in the appended claims.

[0052] [Symbol Explanation]

[0053] 100: Scalable circuit board

[0054] 106: Metal layer

[0055] 117: Protective layer

[0056] 118: Surface treatment layer

[0057] 200: Flexible display device

[0058] 110, 210: Flexible circuit substrate

[0059] 110': Flexible substrate

[0060] 111, 211: Flexural portion

[0061] 112, 212: Adjustment section

[0062] 112a, 212a: First layer of bend

[0063] 112b, 212b: Second layer bend

[0064] 113, 213: Line layer

[0065] 114, 214: Slides

[0066] 115, 215: Adhesive layer

[0067] 116, 216: Circuit elements

[0068] 120, 220: Telescopic components

[0069] 121, 221: Fasteners

[0070] 122, 222: Fixed end

[0071] 123, 223: Elastic components

[0072] 124a, 224a: First slider

[0073] 124b, 224b: Second slider

[0074] 125, 225: Support components

[0075] 230: Hinge structure

[0076] 300: Manufacturing method

[0077] 301, 302, 303, 304, 305, 306, 307: Steps

[0078] A-A' : line

[0079] L: Length of stretch

[0080] S: Storage space.

Claims

1. A retractable circuit board, characterized in that, Include: Flexible circuit substrate, comprising: Flexural portion; and Two adjusting portions are located at opposite ends of the flexural portion, each having a first layer of bending, wherein two grooves are formed between the flexural portion and the two adjusting portions; and Two telescopic components are respectively disposed in the two sliding grooves, wherein the two telescopic components include: Two fixing members are respectively fixed to the two adjusting parts and are respectively located in the two sliding grooves; The two fixed ends are respectively located within the first layer of bend of each of the two adjusting parts; and Two elastic elements are respectively fixed to the two fixing elements, and are respectively located between the fixing end of each of the two adjusting parts and the fixing elements; When the flexural portion is stretched or bent, the two telescopic components drive the two adjusting portions, so that the two fixing members of the two telescopic components move along the two sliding grooves in a direction away from the flexural portion, and compress the two elastic members respectively.

2. The retractable circuit board according to claim 1, characterized in that, Each of the two telescopic components further includes a support member, which is disposed below and around one of the two slides.

3. The retractable circuit board according to claim 1, characterized in that, The flexible circuit substrate further comprises: A first conductor layer, wherein the first conductor layer is disposed on the lower surface of the flexural portion; and A second conductor layer is disposed on the surface of the second bent portion of the two adjustment portions.

4. The retractable circuit board according to claim 3, characterized in that, It also includes a plurality of circuit elements, wherein the plurality of circuit elements are disposed on the second conductor layer.

5. The retractable circuit board according to claim 1, characterized in that, Each of the two telescopic components further includes a first sliding piece, which is fixed above the top surface of the fixing member, and the area of ​​the first sliding piece is larger than the area of ​​the top surface of the fixing member.

6. The retractable circuit board according to claim 5, characterized in that, Each of the telescopic components further includes a second slide plate, which is disposed around one of the two slide grooves.

7. A flexible display device, characterized in that, Include: Hinge structure; A flexible circuit substrate includes a flexible portion and two adjusting portions, wherein the flexible portion and the two adjusting portions form an accommodating space, and two grooves are respectively formed between the flexible portion and the two adjusting portions; and Two telescopic components are respectively disposed in the two sliding grooves and each has two first-layer bends, wherein the two telescopic components include: Two fixing members are respectively fixed to the two adjusting parts and are respectively located in the two sliding grooves; The two fixed ends are respectively located within the first layer of bend of each of the two adjusting parts; and Two elastic elements are respectively fixed to the two fixing elements, and are respectively located between the fixing end of each of the two adjusting parts and the fixing elements; The hinge structure is attached to a portion of the lower surface of the two adjusting parts so that the hinge structure can straighten or bend along with the two adjusting parts; When the flexible display device is bent, the two telescopic components drive the two adjusting parts, so that the two fixing members of the two telescopic components move along the two sliding grooves in a direction away from the flexural part, and respectively compress the two elastic members, and the hinge structure bends synchronously with the two adjusting parts, so that the hinge structure is accommodated in the accommodating space.

8. The flexible display device according to claim 7, characterized in that, The flexible circuit substrate further comprises: A first conductor layer, wherein the first conductor layer is disposed on the lower surface of the flexural portion; and A second conductor layer is disposed on a portion of the surface of the second bend of the two adjustment portions, and the second conductor layer contains a plurality of circuit elements.

9. The flexible display device according to claim 7, characterized in that, Each of the two telescopic components further includes: A first sliding piece, wherein the first sliding piece is fixed above the top surface of the fixing member, and the area of ​​the first sliding piece is larger than the area of ​​the top surface of the fixing member; and The second slide plate is disposed around one of the two slide grooves.

10. A method for manufacturing a stretchable circuit board, characterized in that, Include: A flexible substrate is provided, wherein two fasteners and a circuit layer are formed on the flexible substrate; A first bending step is performed on both ends of the flexible substrate to form two first bends at each end; After the two first bends are formed, two grooves are formed on the flexible substrate, such that a flexed portion of the flexible substrate and the two ends are separated by the two grooves respectively. The two elastic elements are respectively fixed to the two fixed elements; The two fixed ends are respectively fixed to the two elastic members; A second bending step is performed on the two ends of the flexible substrate, bending the two ends toward the direction of the flexural portion, so that the two fixing members are respectively inserted into the two sliding grooves, thereby forming the two first bends and the two second bends; and The two sliding pieces are attached to the top surface of the two sliding grooves.

11. The method according to claim 10, characterized in that, Also includes: Multiple circuit elements are attached to the surfaces of the two first bends at both ends.

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