Method for manufacturing flexible board having semi-etch bending slot slot and flexible board

Abstract

The present invention relates to a method for manufacturing a flexible board having a semi-etched curved slit groove and a flexible board manufactured using the same, in which curved slit grooves are respectively formed on both sides of a curved portion of the flexible board by a semi-etching method in a direction parallel to the curved portion, thereby increasing the bending curvature of the flexible board, improving the bending performance of the flexible board, and improving the bending performance of the flexible board. The manufacturing method comprises: a step (a) of preparing a plate material having a flat plate shape; (b) forming at least one curved slit groove on each of both sides of a region where a curved portion is to be formed on the plate material by first half etching; and (c) forming, on the plate material, an outer contour of a unit flexible plate, a bent portion between the bent slit grooves, and a fixed dummy plate connecting mounting portions formed on both sides of the bent portion by a second full etching.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a flexible board with a half-etched curved slit groove and a flexible board manufactured by the manufacturing method. More specifically, the present invention relates to a method for manufacturing a flexible board with a half-etched curved slit groove and a flexible board manufactured by the manufacturing method. The method forms curved slit grooves on both sides of a curved portion of the flexible board by half-etching in a direction parallel to the curved portion, thereby increasing the bending curvature of the flexible board and improving the bending performance of the flexible board. Background Art

[0002] Conventional display devices are rapidly changing to flat panel displays (Flat Panel Display, hereinafter referred to as "FPD"), replacing cathode-ray tubes (CRT). FPDs include liquid crystal displays (LCD), plasma display panels (PDP), organic light-emitting display devices (LED), etc. Compared with CRT, this type of FPD has the advantages of being lightweight, thin, and conducive to large-scale. On the contrary, FPD uses a glass substrate to withstand the high heat generated in the manufacturing process, so there are limitations in giving lightness, thinness, and flexibility. In order to overcome such problems, a flexible display device has recently been developed that uses flexible materials such as plastics to replace inflexible glass substrates, which can maintain display performance even if bent like paper.

[0003] Figure 1 (a) to (c) are diagrams for explaining a portable terminal having a conventional flexible display.

[0004] In a portable terminal having a conventional flexible display 1, such as Figure 1 As shown in (a), the first main body 2 and the second main body 3 combined with the flexible display 1 can be unfolded side by side. Figure 1 As shown in (b), the flexible display 1 can maintain a state of being bent at a predetermined angle. Figure 1 As shown in (c), the flexible display 1 can be completely folded.

[0005] That is, the portable terminal with the flexible display 1 can be folded or unfolded freely, and can maintain a bent state at any angle required by the user within 180°.

[0006] Figure 2 An exploded perspective view of the portable terminal as described above is shown.

[0007] The first housing 2b and the second housing 3b are connected to each other through the hinge part 4, and the first plate 2a and the second plate 3a are attached to one side of the first housing 2b and the second housing 3b respectively. In addition, the first cover plate 2c and the second cover plate 3c are attached to the other side of the first housing 2b and the second housing 3b. Therefore, as the hinge part 4 covered by the hinge cover 4a moves, the flexible display 1 attached to the first plate 2a and the second plate 3a can be freely folded or unfolded.

[0008] In this case, the folded portion between the first plate 2a and the second plate 3a is a bendable and deformable bent portion. Also, the flexible display 1 is attached to the front surfaces of the first plate 2a and the second plate 3a, and various main components and accessory components for display functions and portable terminal functions are combined to the front surfaces of the first plate 2a and the second plate 3a.

[0009] The bending portion is formed by a micro-through hole process, and a plurality of slit holes extending in a direction perpendicular to the bending direction are arranged crosswise, thereby forming a fragile structure. Due to the bending portion, the flexible board can be folded or unfolded at any angle required by the user within 180 degrees.

[0010] However, when the flexible board is folded only by the bent portion, the first board 2a and the second board 3a cannot be in surface contact due to the limited curvature of the bent portion, resulting in a gap between the first board 2a and the second board 3a, the width of which becomes narrower as it approaches the ends of the first board 2a and the second board 3a. The gap in the folded portion of the flexible board not only reduces the aesthetics and thinness of the portable terminal, but also reduces the user's satisfaction, and ultimately reduces the commercial value of the portable terminal using the flexible board. Summary of the invention

[0011] Technical issues

[0012] The present invention is proposed to solve the above problems of the prior art, and its purpose is to provide a method for manufacturing a flexible board with a half-etched curved slit groove, in which curved slit grooves are formed on both sides of the curved portion of a flexible board by half-etching in a direction parallel to the curved portion, thereby increasing the bending curvature of the flexible board and improving the bending performance of the flexible board, and a flexible board manufactured by the manufacturing method.

[0013] Technical Solution

[0014] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a method for manufacturing a flexible board, characterized in that the method comprises: step (a), preparing a plate material in a flat plate shape; step (b), forming at least one curved slit groove on both sides of an area where a curved portion is to be formed on the plate material through a first half etching; and step (c), forming an outer contour of a unit flexible board, a curved portion between the curved slit grooves, and a fixed dummy plate connecting mounting portions formed on both sides of the curved portion on the plate material through a second full etching.

[0015] Preferably, the present invention is characterized in that, in step (b), the half etching is performed at a depth that does not penetrate the plate material but corresponds to half the thickness of the plate material.

[0016] Preferably, the curved slit grooves are formed in equal numbers on both sides of the curved portion, the length of each curved slit groove in the longitudinal direction may be equal to the length of the curved portion in the longitudinal direction, and the two side ends of each curved slit groove are formed corresponding to the two side ends of the unit flexible board.

[0017] Preferably, the present invention is characterized in that the same number of curved slit grooves are formed on both sides of the curved portion, and the two side ends of each curved slit groove pass over the two side ends of the unit flexible board and extend to form a supporting portion of the fixed dummy board. By reducing the length of the corner portions (columns) of each fixed dummy board, the size of the closed area formed by the supporting portion and the corner portion of each fixed dummy board and the end of the flexible board is reduced.

[0018] Preferably, the present invention is characterized in that the full etching is performed to a depth that penetrates through the plate material.

[0019] Preferably, the present invention is characterized in that the outer contour of the unit flexible board cut by full etching is a rectangular shape, and through full etching, a curved portion having a plurality of slit holes arranged crosswise with each other can be formed in the central part of the flexible board, so that the flexible board has a first mounting portion and a second mounting portion formed on both sides of the curved portion, and through full etching, a fixed dummy board can be protrudingly formed in a horizontal direction on the flexible board.

[0020] In order to achieve the above-mentioned purpose, according to another aspect of the present invention, there is provided a flexible board manufactured by the above-mentioned method, characterized in that the flexible board comprises: a bending portion, on one side of which a plurality of slit grooves are arranged in a direction perpendicular to the bending direction; a first mounting portion and a second mounting portion, which are separated by the above-mentioned bending portion and are formed on both sides of the bending portion; a fixed dummy plate, which protrudes from the first mounting portion and the second mounting portion in a horizontal direction and is used to connect the first mounting portion and the second mounting portion with the bending portion in between to each other; and at least one curved slit groove, which is respectively formed on the first mounting portion and the second mounting portion in a direction parallel to the bending portion by half etching.

[0021] Beneficial Effects

[0022] According to the present invention, the manufacturing method of the flexible board with half-etched curved slit grooves has the following effect: curved slit grooves are respectively formed on both sides of the curved portion of the flexible board by half-etching in a direction parallel to the curved portion, thereby increasing the bending curvature of the flexible board, thereby improving the bending performance of the flexible board.

[0023] Furthermore, the method according to the present invention has the following effects: unlike a flexible board that is folded only by a bent portion, since the bending curvature on the folded portion becomes larger, the two folded sides of the flexible board can achieve surface contact, thereby not only achieving the aesthetics and lightness of the portable terminal, but also improving the user's satisfaction, thereby also improving the commercial value of the portable terminal using the flexible board. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 (a) to (c) are diagrams for explaining the operation of a portable terminal having a conventional flexible display.

[0025] Figure 2 is an exploded perspective view of a portable terminal having a conventional flexible display.

[0026] Figure 3 (a) and (b) are top views of a flexible board according to a conventional embodiment.

[0027] Figure 4 It is a diagram for explaining a folded state of a flexible board according to a conventional embodiment.

[0028] Figure 5 FIG. 1 is a process diagram for illustrating a method for manufacturing a flexible board having a half-etched curved slit groove according to an embodiment of the present invention.

[0029] Figure 6 (a) and (b) are a top view and a cross-sectional view for illustrating a flexible board having a half-etched curved slit groove manufactured according to an embodiment of the present invention.

[0030] Figure 7 (a) and (b) are a top view and a cross-sectional view for illustrating a flexible board having a half-etched curved slit groove manufactured according to another embodiment of the present invention.

[0031] Figure 8 FIG. 1 is a side view for explaining a folded state of a flexible board according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The present invention may be modified in various ways and may have various embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, but it should be understood that the present invention includes all changes, equivalents and even substitutes included in the concept and technical scope of the present invention. When describing each of the drawings, similar reference numerals are used for similar structural elements.

[0033] The terms first, second, A, B, etc. can be used to describe various structural elements, and the above structural elements should not be limited to the above terms. The above terms are used only for the purpose of distinguishing one structural element from other structural elements. For example, without departing from the scope of the present invention, the first structural element can be named as the second structural element, and similarly, the second structural element can also be named as the first structural element. The so-called "and / or" term includes a combination of multiple related recorded items or any one of multiple related recorded items.

[0034] When it is mentioned that a structural element is "connected" or "connected" to another structural element, it should be understood that it can be directly connected or connected to the other structural element, but other structural elements may exist in between. Conversely, when it is mentioned that a structural element is "directly connected to" or "directly connected to" another structural element, it should be understood that there are no other structural elements in between.

[0035] The terms used in this application are only used to illustrate specific embodiments and are not intended to limit the present invention. Unless the context clearly defines otherwise, singular expressions include plural expressions. In this application, terms such as "including", "comprising" or "having" should be understood as being used to specify the existence of features, numbers, steps, operations, structural elements, parts or combinations thereof recorded in the specification, without excluding in advance the existence or additional possibility of one or more other features or numbers, steps, operations, structural elements, parts or combinations thereof.

[0036] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by those skilled in the art in the art to which the present invention belongs. Terms defined in commonly used dictionaries should be interpreted as having the same meaning as that in the context of the relevant technology, and should not be interpreted as an ideal or exaggerated meaning unless clearly defined in this application.

[0037] Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

[0038] Figure 3 (a) and (b) are top views of a flexible board according to a conventional embodiment.

[0039] Reference Figure 3 In (a) and (b), the flexible board 100 according to the previous embodiment is formed in a flat plate shape as a whole, and a bendable and deformable bent portion 130 is formed on one side thereof. Each flexible board 100 has mounting portions 110 and 120 formed on both sides, respectively, and the bent portion 130 is interposed between the mounting portions 110 and 120.

[0040] The flexible board 100 may be formed of a metal material or a non-metal material, and may be manufactured by cutting the metal or non-metal material into individual units through an etching process.

[0041] As described above, not only the display portion is attached but also various main components and accessory components for providing a display function and a portable terminal function are combined on the front surface of the flexible board 100 .

[0042] The flexible board 100 has a bent portion 130 so that the flexible board 100 can be mounted on the front surface of the flexible display unit. Figure 1 and Figure 2 As described above, it can be folded or unfolded at any angle required by the user within 180°.

[0043] The bending portion 130 is formed by a micro-through hole process, and a plurality of slit holes extending in a direction perpendicular to the bending direction are cross-arranged, so that the bending portion 130 has a fragile structure.

[0044] And, based on the bent portion 130 , a first mounting portion 110 and a second mounting portion 120 are respectively formed on both sides of the flexible board 100 .

[0045] like Figure 3 In the flexible board shown in (a), based on the bending portion 130, the first mounting portion 110 and the second mounting portion 120 are respectively formed on the left and right sides. Accordingly, the flexible board 100 is suitable for a display portion that is folded vertically.

[0046] On the contrary, if Figure 3In the flexible board shown in (b), based on the bending portion 130, the first mounting portion 110 and the second mounting portion 120 are respectively formed on the upper and lower sides. Accordingly, the flexible board 100 is suitable for a display portion that is folded laterally.

[0047] Furthermore, in order to prevent the tiny positions of the mounting parts 110 and 120 from moving during the actual component assembly process, a fixed dummy plate 200 for connecting the mounting parts 110 and 120 on both sides with the bending part 130 in between may be provided. The specific structure and function of the fixed dummy plate 200 are described in detail in the Korean Patent Application Publication Nos. 2022-0003920 and 2022-0003921 of the applicant, and thus the detailed description is omitted. The entire contents of the above patent applications are incorporated into this application by reference.

[0048] The fixed dummy plates 200 are formed of the same material as the flexible plate 100 and extend from the flexible plate 100 in an etching process in which the flexible plate 100 is cut and manufactured in units. Each fixed dummy plate 200 protrudes from the flexible plate 100 in a horizontal direction and is formed as a whole. And, when the component assembly process is finished, the fixed dummy board 200 is removed from the flexible board 100 by the operator by pulling or tearing it by hand.

[0049] According to the prior art, the flexible board 100 is provided with a bent portion 130. Figure 4 The mounting parts 110 and 120 on both sides can be rotated, so that the flexible board 100 can be folded or unfolded at any angle required by the user within 180 degrees by forming the bending part 130 .

[0050] However, when the flexible board 100 is folded only by the bending portion 130 that is bendable using the slit hole, Figure 4 The curvature of the bending portion 130 of the folded portion is limited, so the first plate 2a and the second plate 3a cannot be in surface contact with each other, resulting in a gap between the first plate 2a and the second plate 3a, the width of which becomes narrower as it approaches the ends of the first plate 2a and the second plate 3a. The gap in the folded portion of the flexible board 100 not only reduces the aesthetics and thinness of the portable terminal, but also reduces the user's satisfaction, and ultimately reduces the commercial value of the portable terminal using the flexible board.

[0051] Figure 5 FIG. 1 is a process diagram for illustrating a method for manufacturing a flexible board having a half-etched curved slit groove according to an embodiment of the present invention.

[0052] The greatest feature of the present invention is that, as described above, curved slit grooves 111 and 121 are respectively formed on both sides of the curved portion 130 of the flexible board 100 by half etching in a direction parallel to the curved portion 130, thereby increasing the bending curvature of the flexible board 100 and improving the bending performance of the flexible board 100.

[0053] The following will illustrate the formation of curved slit grooves 111 and 121 on both sides of the curved portion 130 through various embodiments, but the present invention is not limited thereto. Of course, multiple curved slit grooves 111 and 121 can also be formed on both sides of the curved portion 130 by half etching to achieve more flexible bending.

[0054] First, as a first step ( S10 ), a plate material in a flat plate shape is prepared.

[0055] The plate material has a relatively wide plate shape from which a plurality of unit flexible plates 100 can be manufactured, and is formed of an etchable metal material or a non-metal material.

[0056] Next, as a second step ( S20 ), a first half etching process is performed to form at least one curved slit groove 111 , 121 on both sides of a region where the curved portion 130 is to be formed for each unit flexible board 100 by half etching.

[0057] The above-mentioned half etching means a process of etching at a depth corresponding to half the thickness of the plate material without penetrating the plate material.

[0058] In this case, the curved slit grooves 111, 121 are as follows Figure 6 As shown in (a) and (b), the same number of electrodes are formed on both sides of the curved portion 130.

[0059] And, if Figure 6 As shown in (a), the length of each curved slit groove 111, 121 in the longitudinal direction is equal to the length of the curved portion 130 in the longitudinal direction, and the width of each curved slit groove 111, 121 is equal to the thickness of the board material. The two side ends of each curved slit groove 111, 121 are formed corresponding to the two side ends of the unit flexible board 100.

[0060] Also, the interval between each curved slit groove 111 , 121 and the curved portion 130 is equal to the thickness of the plate material.

[0061] And, if Figure 6 As shown in (b), the depth of each curved slit groove 111, 121 formed by half etching is equal to the depth corresponding to half the thickness of the plate material.

[0062] As described above, one curved slit groove 111 and one curved slit groove 121 may be formed on both sides of the curved portion 130 , respectively, each having a width corresponding to the thickness of the plate material.

[0063] In addition, a plurality of curved slit grooves 111 and 121 may be formed on both sides of the curved portion 130, each having a width corresponding to the thickness of the plate material. In this case, the interval between each curved slit groove and the curved portion 130 is equal to the thickness of the plate material. As an example, four curved slit grooves 111 and four curved slit grooves 121 may be formed on both sides of the curved portion 130. The number of such curved slit grooves 111 and 121 may be variously selected according to the size of the flexible board 100 and the curvature of the curved portion 130.

[0064] Next, as a third process ( S30 ), a second full etching process is performed on the board material to form the outer contour of the unit flexible board 100 , the bent portion 130 , and the fixed dummy board 200 .

[0065] The above-mentioned full etching means that the etching depth penetrates through the board material and cuts the flexible board 100 so that it can be separated from the board material.

[0066] In this case, the outer contour of the unit flexible board 100 cut by full etching is as follows Figure 6 As shown in (a) and (b), the flexible board 100 may be in a quadrangular shape, and a bent portion 130 having a plurality of slit holes arranged crosswise is formed at the center of the flexible board 100 by full etching. Thus, the flexible board 100 has a first mounting portion 110 and a second mounting portion 120 formed on both sides of the bent portion 130. Furthermore, a fixed dummy plate 200 is formed protrudingly in the horizontal direction on the flexible board 100 by full etching.

[0067] Each fixed dummy plate 200 includes: a support portion 230 formed in a plate shape and in a longitudinal direction; corner portions 210 and 220 extending from the ends of both sides of the support portion 230 in a right angle direction and connected to the mounting portions 110 and 120 on both sides of the flexible board 100, respectively. The fixed dummy plate 200 protrudes horizontally from the flexible board 100 to form The corner portions 210 and 220 at the ends of the two sides and the support portion 230 connecting them are extended from the mounting portions 110 and 120 of the flexible board 100.

[0068] Furthermore, the regions of the first mounting portion 110 and the second mounting portion 120 are in a state where the first curved slit groove 111 and the second curved slit groove 121 are formed through the first half etching process.

[0069] Figure 6In the top view and cross-sectional view of the flexible board 100 shown in (a) and (b), the sizes of the components of the flexible board 100 may be exaggerated for clarity and convenience of description. Therefore, the present invention is not limited to the explanation using only the drawings.

[0070] refer to Figure 6 (a), through the second full etching process, the flexible board 100 is formed in a quadrilateral shape, and mounting parts 110 and 120 are formed on both sides respectively, and a bending part 130 is separated between the mounting parts 110 and 120, and fixed dummy boards 200 are formed at the ends of both sides of the bending part 130 to connect the mounting parts 110 and 120 to each other.

[0071] In this case, the curved slit grooves 111 and 121 have been formed on the mounting parts 110 and 120 at both sides through the first half etching process.

[0072] Therefore, by half etching, curved slit grooves 111 and 121 are respectively formed on both sides of the curved portion 130 of the flexible board 100 in a direction parallel to the curved portion 130. Figure 8 As shown in the figure, the bending position is increased by means of the curved slit grooves 111 and 121, and additional bending occurs at the positions where the curved slit grooves 111 and 121 are formed. Figure 4 Unlike the flexible board 100 shown, the bending curvature of the flexible board 100 at its folded portion becomes larger, so the mounting portions 110 and 120 can contact the ground without a gap.

[0073] In addition, if Figure 6 As shown in (a) and (b), both ends of each curved slit groove formed by the first half etching process correspond to both ends of the unit flexible board 100, just like both ends of the curved portion 130 formed by the second full etching process.

[0074] However, the etching solution used for the second full etching is accumulated in the closed area A formed by the fixed dummy board 200 and the flexible board 100 in the second full etching process (refer to Figure 6 (a)), it is confirmed that the ends of both sides of each curved slit groove formed by the first half etching process are over-etched. This over-etching at the ends of both sides of each curved slit groove in the second full etching process achieves a deeper depth than the designed value, and further, it is found that the cross-section of the end of each curved slit groove cannot be clearly formed by this over-etching. This ultimately causes the curvature of the curved slit grooves 111 and 121 to differ from the designed value, reducing the bending accuracy of the product and reducing the surface finishing of the overall product.

[0075] Figure 7(a) and (b) are a top view and a cross-sectional view for illustrating a flexible board having a half-etched curved slit groove manufactured according to another embodiment of the present invention.

[0076] According to another embodiment of the present invention, in order to suppress over-etching at the ends of the curved slit grooves 111 and 121, the ends of the curved slit grooves 111 and 121 are separated from the closed area A by extending the length of the curved slit grooves 111 and 121, thereby fundamentally preventing over-etching at the ends of the curved slit grooves 111 and 121. In addition, it is confirmed that by reducing the length of the corner portions 210 and 220 on both sides of each fixed dummy board 200, the horizontal space size of the closed area A formed by the fixed dummy board 200 and the flexible board 100 is reduced, thereby reducing the phenomenon that the etching solution put in the second full etching process accumulates in the closed area A.

[0077] As shown in one embodiment of the present invention Figure 6 As shown in (a), both ends of each curved slit groove formed by the first half etching process correspond to both ends of the unit flexible board 100, just like both ends of the curved portion 130 formed by the second full etching process.

[0078] Different from this, in a flexible board 100 according to another embodiment of the present invention, as Figure 7 As shown in (a), both ends of each curved slit groove formed by the first half etching pass over both ends of the flexible board 100 and extend to the support portion 230 for fixing the dummy board 200.

[0079] Furthermore, in a flexible board 100 according to another embodiment of the present invention, as Figure 7 As shown in (a), the lengths of the corner portions 210 and 220 on both sides of the fixed dummy plate 200 are reduced, and the width of the support portion 230 is increased, so that the ends of both sides of each curved slit groove do not contact the closed area A.

[0080] As a result, the horizontal space size of the closed area A formed by the support portion 230 of the fixed dummy board 200 and the two side corner portions 210, 220 and the end of the flexible board 100 is greatly reduced, thereby preventing the etching solution input in the second full etching process from accumulating in the closed area A.

[0081] Furthermore, since both ends of the curved slit grooves 111 and 121 preformed in the first half etching process are separated from the closed area A, the etching solution added in the second full etching process is prevented from etching both ends of the curved slit grooves 111 and 121 .

[0082] Moreover, the fixed dummy board 200 is still provided by The support portion 230 and the corner portions 210 and 220 on both sides configured in the shape of a letter "U" support the mounting portions 110 and 120, so that the tiny position flow of the mounting portions 110 and 120 can be blocked during the component assembly process, and even if the staff pulls the fixed dummy plate 200 by hand or tears it off from the flexible board 100 after the component assembly process, the corner portions 210 and 220 on both sides can be easily cut, thereby realizing the feature of easy removal of the fixed dummy plate 200.

[0083] The foregoing description of the embodiments of the present invention is provided for the purpose of illustration; it is not intended to be exhaustive or to limit the present invention to the precise form disclosed. It will be appreciated by those skilled in the relevant art that many modifications and variations are possible in light of the above teachings. Therefore, the scope of the present invention is not limited by this detailed description, but is defined by the appended claims.

[0084] Description of Reference Numerals

[0085] 100: flexible board 110: first mounting portion

[0086] 111: first curved slit groove 120: second mounting portion

[0087] 121: second curved slit groove 130: curved portion

[0088] 200: fixed dummy plate 210: first intersection

[0089] 220: second intersection portion 230: support portion

Claims

1. A method for manufacturing a flexible board having a half-etched curved slit groove, the method include: Step (a), preparing a plate material in the shape of a flat plate; Step (b), forming at least one curved slit groove on both sides of the region where the curved portion is to be formed on the plate material by a first half etching; as well as Step (c) is to form, on the board material, an outer contour of the unit flexible board, a bent portion between the bent slit grooves, and a fixed dummy board connecting mounting portions formed on both sides of the bent portion through a second full etching.

2. The method according to claim 1, in, In the step (b), the half etching is performed at a depth that does not penetrate the plate material but corresponds to a half thickness of the plate material.

3. The method according to claim 2, in, The curved slit grooves are formed in equal numbers on both sides of the curved portion. The length of each curved slit groove in the longitudinal direction is equal to the length of the curved portion in the longitudinal direction, so that both side ends of each curved slit groove are formed corresponding to both side ends of the unit flexible board.

4. The method according to claim 2, in, The curved slit grooves are formed in equal numbers on both sides of the curved portion. The two side ends of each curved slit groove pass over the two side ends of the unit flexible board and extend to form a support portion of the fixed dummy board. By reducing the length of the corner portion of each fixed dummy board, the size of the closed area formed by the support portion and the corner portion of each fixed dummy board and the end of the flexible board is reduced.

5. The method according to claim 1, in, The full etch is performed to a depth that passes through the board material.

6. The method according to claim 5, in, The unit flexible board cut by the full etching has a quadrangular shape, By the full etching, a bent portion having a plurality of slit holes arranged crosswise with each other is formed at the center of the flexible board, so that the flexible board has a first mounting portion and a second mounting portion formed on both sides of the bent portion. Through the full etching, a fixed dummy plate is protrudingly formed on the flexible plate in a horizontal direction.

7. A flexible board manufactured by the method according to any one of claims 1 to 6, wherein the flexible board include: A bending portion, wherein a plurality of slit grooves are arranged on one side inside the bending portion in a direction perpendicular to the bending direction; A first mounting portion and a second mounting portion are formed on both sides of the bent portion with the bent portion interposed therebetween; A fixed dummy plate protrudes from the first mounting portion and the second mounting portion in a horizontal direction, and is used to connect the first mounting portion and the second mounting portion with the bent portion in between. as well as At least one curved slit groove is formed on the first mounting portion and the second mounting portion respectively in a direction parallel to the curved portion by half etching.

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