Flexible printed circuit (FPC) bending structure of smart watch

Abstract

According to the FPC bending structure of the intelligent watch provided by the utility model, the double-sided adhesive tape is arranged on one side, back on to the touch control layer, of the touch control FPC, during assembly, the touch control FPC is aligned with the pin binding position of the touch control layer at first, the double-sided adhesive tape is attached to the pin binding position, and the size of the double-sided adhesive tape is reduced and the attaching sequence is adjusted, so that the flexible printed circuit board of the intelligent watch is obtained. According to the technical scheme, under the condition that circuit connection is guaranteed, the bending radius of the touch FPC can be reduced, so that the sealing performance of the whole machine is improved, external moisture and dust are prevented from entering, meanwhile, the stress generated when the touch FPC is bent is reduced, and the service life of the watch is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of smart watches, in particular to an FPC bending structure of a smart watch. Background Art

[0002] With the improvement of the intelligent level, smart wearable watches have become a necessity in people's lives. Low-end watch products that pursue cost performance generally use TFT panels with external touch screens. The touch screen structure generally uses GF. The area where the cover glass extends beyond the edge of the touch layer is the area where the customer's case is spot-glued. The size of this area determines the sealing performance of the whole machine. And the space size after the FPC is bent is a determining factor.

[0003] For the existing FPC, because there is no OCA to fit and fix with the cover glass, and there is a concern about the problem of falling off due to pulling, a double-sided adhesive is attached at the position where the FPC is bonded. Generally, the double-sided adhesive is first attached to the cover glass, and then the touch layer is attached. Among them, the double-sided adhesive is larger than the touch layer. In this way, part of the FPC can be adhered to the cover glass by the double-sided adhesive. However, in this case, the bending radius of the FPC is relatively large, resulting in poor sealing performance of the whole machine. Summary of the Utility Model

[0004] In order to solve the above-mentioned deficiencies of the prior art, the utility model provides an FPC bending structure of a smart watch. By setting a double-sided adhesive on the side of the touch FPC facing away from the touch layer, during assembly, the touch FPC is first aligned and bonded with the pin binding position of the touch layer, and the double-sided adhesive is attached to the side of the touch FPC facing away from the touch layer. By reducing the size of the double-sided adhesive and adjusting the fitting sequence, the touch FPC can be fixed to the cover without the double-sided adhesive exceeding the edge of the touch layer. It can reduce the bending radius of the touch FPC while ensuring circuit connection, so as to improve the sealing performance of the whole machine, prevent external moisture and dust from entering, and at the same time reduce the stress when the touch FPC is bent, and extend the service life of the watch.

[0005] The technical problem to be solved by the utility model is realized through the following technical solutions: An FPC bending structure of a smart watch, comprising: a cover plate, including a VA viewing area and a border ink area;

[0006] A touch layer, attached to the lower surface of the cover plate, covering the VA viewing area and part of the border ink area; pins binding positions are provided at the bottom edge of the touch layer;

[0007] A touch FPC, which is bound and connected with the pin binding position of the touch layer, and a double-sided adhesive is provided on the side of the touch FPC facing away from the touch layer, and the double-sided adhesive does not exceed the edge of the touch layer;

[0008] The touch FPC is adhesively fixed to the cover plate on the side facing away from the touch layer through the double-sided adhesive.

[0009] As a preferred solution of the FPC bending structure of the smart watch provided by the present invention, the touch layer is ITO bridging, nano silver or metal mesh.

[0010] As a preferred solution of the FPC bending structure of the smart watch provided by the present invention, the upper surface of the cover plate is provided with a coating layer.

[0011] As a preferred solution of the FPC bending structure of the smart watch provided by the present invention, the coating layer is one or a combination of two or more of an AG layer, an AR layer, and an AF layer.

[0012] As a preferred solution of the FPC bending structure of the smart watch provided by the present invention, on the back of the cover plate located in the border ink area, a first white ink layer, a second white ink layer, a third white ink layer, and a fourth black anti-cover ink layer are sequentially stacked from top to bottom. After the first white ink layer, the second white ink layer, the third white ink layer, and the fourth black anti-cover ink layer are stacked, an ink step difference is formed. A varnish layer is provided on the back of the cover plate, and the varnish layer covers the back of the cover plate in the visible area, the back of the fourth black anti-cover ink layer, and the ink step difference.

[0013] As a preferred solution of the FPC bending structure of the smart watch provided by the present invention, the inner edge line of the second white ink layer is located between the inner edge line of the first white ink layer and the edge line of the cover plate.

[0014] As a preferred solution of the FPC bending structure of the smart watch provided by the present invention, the inner edge line of the third white ink layer is located between the inner edge line of the second white ink layer and the edge line of the cover plate.

[0015] As a preferred solution of the FPC bending structure of the smart watch provided by the present invention, an anti-static rubber ring is provided on the back of the non-display area of the outer circle of the cover plate.

[0016] As a preferred solution of the FPC bending structure of the smart watch provided by the present invention, a first optical adhesive layer is provided on the back of the cover plate. The touch layer and the cover plate are adhered through the first optical adhesive layer. A TFT panel is provided at the bottom of the touch layer, and the TFT panel is adhered to the touch layer through a second optical adhesive layer.

[0017] As a preferred solution of the FPC bending structure of the smart watch provided by the present invention, the first optical adhesive layer and the second optical adhesive layer are OCA or OCR optical adhesives.

[0018] The utility model has the following beneficial effects: An FPC bending structure of a smart watch, comprising a cover plate, including a VA viewing area and a border ink area; a touch layer, attached to the lower surface of the cover plate, covering the VA viewing area and a part of the border ink area; a pin binding position is provided at the bottom edge of the touch layer; a touch FPC, the touch FPC is fixedly bonded to the touch layer through double-sided adhesive; a window copper leakage area is provided on the bonding surface of the touch FPC, and double-sided adhesive is provided in the copper leakage area. In this application, by setting double-sided adhesive on the side of the touch FPC facing away from the touch layer, during assembly, the touch FPC is first aligned and bound with the pin binding position of the touch layer, and the double-sided adhesive is attached to the side of the touch FPC facing away from the touch layer. By reducing the size of the double-sided adhesive and adjusting the bonding sequence, the double-sided adhesive can achieve the bonding and fixation of the touch FPC and the cover plate without exceeding the edge of the touch layer. It can reduce the bending radius of the touch FPC while ensuring circuit connection, improve the overall sealing performance of the machine, prevent external moisture and dust from entering, and at the same time reduce the stress during the bending of the touch FPC and extend the service life of the watch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the solutions in this application, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the drawings in the following description are some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is the back view of the FPC bending structure of the smart watch provided by the utility model;

[0021] Figure 2 It is the front view of the FPC bending structure of the smart watch provided by the utility model;

[0022] Figure 3 It is the schematic diagram of the touch FPC of the FPC bending structure of the smart watch provided by the utility model;

[0023] Figure 4 It is the schematic diagram of the cover plate structure of the FPC bending structure of the smart watch provided by the utility model;

[0024] Figure 5 It is the stacking schematic diagram of the FPC bending structure of the smart watch provided by the utility model.

[0025] 1. Cover plate; 101. VA viewing area; 102. Border ink area; 11. First white ink layer; 12. Second white ink layer; 13. Third white ink layer; 14. Fourth black reverse cover ink layer; 15. Varnish layer; 16. Coating layer; 2. Touch layer; 3. Touch FPC; 31. Exposed copper area; 4. Double-sided adhesive; 5. Anti-static rubber ring; 61. First optical adhesive layer; 62. Second optical adhesive layer; 7. TFT panel. Detailed implementation manners

[0026] The following combines the accompanying drawings and embodiments to describe the present utility model in detail. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0028] In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0029] In the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation", "setting", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can also be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] Embodiment 1

[0031] As Figures 1 - 3As shown in the figure, an FPC bending structure of an intelligent watch provided by the utility model includes a cover plate 1, which includes a VA viewing area 101 and a border ink area 102;

[0032] A touch layer 2 is attached to the lower surface of the cover plate 1, covering the VA viewing area 101 and part of the border ink area 102; a pin binding position is provided at the bottom edge of the touch layer 2;

[0033] A touch FPC 3 is bound and connected to the pin binding position of the touch layer 2. A double-sided adhesive 4 is provided on the side of the touch FPC 3 facing away from the touch layer 2, and the double-sided adhesive 4 does not extend beyond the edge of the touch layer 2;

[0034] The touch FPC is adhesively fixed to the cover plate through the double-sided adhesive on the side facing away from the touch layer.

[0035] In this application, by providing a double-sided adhesive 4 on the side of the touch FPC 3 facing away from the touch layer 2, during assembly, the touch FPC 3 is first aligned and bound with the pin binding position of the touch layer 2, and the double-sided adhesive 4 is attached to the side of the touch FPC 3 facing away from the touch layer 2. By reducing the size of the double-sided adhesive 4 and adjusting the fitting sequence, the double-sided adhesive 4 can achieve the fitting and fixing of the touch FPC 3 and the cover plate 1 without extending beyond the edge of the touch layer 2. It can reduce the bending radius of the touch FPC 3 while ensuring circuit connection, improve the overall sealing performance of the machine, prevent external moisture and dust from entering, and at the same time reduce the stress during the bending of the touch FPC 3, extending the service life of the watch.

[0036] Further, the touch layer 2 is ITO bridging, nano silver or metal mesh. Both the nano silver and metal mesh structures have good flexibility, so they can be applied in flexible touch panels. Compared with ITO materials, in this embodiment, more preferably, the touch layer 2 is formed of nano silver materials and metal mesh materials.

[0037] It should be noted that in this embodiment, the formation process of the metal mesh or nano silver material is not limited. The nano silver material can be spin-coated on a substrate and then a corresponding touch electrode pattern can be formed by laser dry etching; while the metal mesh material is first formed on the substrate by sputtering and then formed by photolithography. The photolithography process includes exposure and development process steps.

[0038] Further, a coating layer 16 is provided on the upper surface of the cover plate 1.

[0039] Further, the coating layer 16 is one or a combination of two or more of an AG layer, an AR layer, and an AF layer. When used in combination, it can be arranged in a stacked manner up and down or in a sub-frame structure.

[0040] Embodiment Two

[0041] As shown Figure 4 in the figure, as a further optimized solution of the first embodiment, in this embodiment, on the back surface of the cover plate 1 located in the border ink area 102, a first white ink layer 11, a second white ink layer 12, a third white ink layer 13, and a fourth black anti-cover ink layer 14 are sequentially stacked from top to bottom. After the first white ink layer 11, the second white ink layer 12, the third white ink layer 13, and the fourth black anti-cover ink layer 14 are stacked, an ink step difference is formed. A varnish layer 15 is provided on the back surface of the cover plate 1, and the varnish layer 15 covers the back surface of the cover plate 1 in the visible area, the back surface of the fourth black anti-cover ink layer 14, and the ink step difference. The back surface of the cover plate 1 is screen-printed with the varnish layer 15. The varnish layer 15 can have one or more layers. The varnish layer 15 completely covers the back surface of the cover plate 1 in the visible area, covers the back surface of the fourth black anti-cover ink layer 14, and fills the ink step difference. Since the varnish layer 15 is provided on the back surface of the cover plate 1, and the cost of the varnish layer 15 is much lower than the cost of the OCA optical adhesive, the overall price of the product is reduced, improving the competitiveness of the product. And because the cost of the varnish layer 15 is relatively low, it can be used in large quantities, so that the varnish layer 15 can cover the back surface of the cover plate 1 in the visible area, the back surface of the fourth black anti-cover ink layer 14, and the ink step difference, that is, the varnish layer 15 can cover the fourth black anti-cover ink layer 14 on the last layer, making the varnish layer 15 the outermost layer. Using the varnish layer 15 as the protection of the last ink layer, and the varnish layer 15 has characteristics such as more wear-resistant, scratch-resistant, high-temperature resistant, and good heat-sealing performance, which can well prevent the problem of edge ink peeling of the cover plate 1 caused by environmental influence, thereby improving the yield of the product to meet the increasing quality requirements of the enterprise.

[0042] In another preferred implementation manner of this embodiment, the inner edge line of the second white ink layer 12 is located between the inner edge line of the first white ink layer 11 and the edge line of the cover plate 1. The inner edge line of the third white ink layer 13 is located between the inner edge line of the second white ink layer 12 and the edge line of the cover plate 1; the distance between the inner edge line of the second white ink layer 12 and the inner edge line of the first white ink layer 11 is 0 mm - 0.1 mm; the distance between the inner edge line of the third white ink layer 13 and the inner edge line of the second white ink layer 12 is 0 mm - 0.1 mm; the distance between the inner edge line of the fourth black anti-cover ink layer 14 and the inner edge line of the first white ink layer 11 is 0.2 mm - 0.4 mm; through the formation of the above ink step difference, the three white ink layers can be basically overlapped at one position in the viewing area, reducing the part where the white ink is thinner and avoiding the formation of a light-transmitting aperture in the viewing area.

[0043] Furthermore, an antistatic rubber ring 5 is provided on the back of the non-display area of the outer ring of the cover plate 1. By pasting the antistatic rubber ring 5 to the back of the cover plate 1 with glue, the effect of blocking static electricity can be achieved.

[0044] Embodiment III

[0045] As Figure 5 shown, a first optical adhesive layer 61 is provided on the back of the cover plate 1. The touch layer 2 and the cover plate 1 are adhered through the first optical adhesive layer 61. A TFT panel 7 is provided at the bottom of the touch layer 2. The TFT panel 7 is adhered to the touch layer 2 through a second optical adhesive layer 62.

[0046] In this embodiment, the first optical adhesive layer 61 and the second optical adhesive layer 62 are OCA or OCR optical adhesives. OCA optical adhesive is a transparent adhesive mainly used for bonding the display screen and touch screen of electronic products. OCA optical adhesive has the characteristics of high transparency, high viscosity, high strength, high temperature resistance, and good weather resistance. It can effectively reduce the air layer between the display screen and the touch screen, improving the display effect and touch sensitivity.

[0047] In this embodiment, the TFT panel 7 is a liquid crystal display screen. The TFT panel liquid crystal display screen is a common flat display technology. It controls the light transmittance of the liquid crystal by adding thin film transistors to each pixel point, thereby realizing the display of images. The TFT panel liquid crystal display screen has excellent color reduction ability, high contrast ratio, fast response time, and wide viewing angle, etc. By adopting the TFT panel liquid crystal display screen, this embodiment can achieve high-definition and delicate image display effects, providing a better visual experience.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention and are not intended to limit them. Although the embodiments of the present invention have been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the embodiments of the present invention can still be modified or equivalently replaced, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A smart watch FPC bending structure, characterized in that: It comprises a cover plate (1), comprising a VA viewing area (101) and a frame ink area (102); A touch layer (2) is adhered to the lower surface of the cover plate (1) and covers the VA viewing area (101) and a portion of the frame ink area (102); a pin binding position is provided at the bottom edge of the touch layer (2); A touch FPC (3), the touch FPC (3) being connected to the pin binding position of the touch layer (2), and having a double-sided adhesive (4) disposed on a side of the touch FPC facing away from the touch layer (2), wherein the double-sided adhesive (4) does not extend beyond the edge of the touch layer (2); The side of the touch FPC (3) facing away from the touch layer (2) is bonded and fixed to the cover plate (1) via the double-sided adhesive (4).

2. The FPC bending structure of a smart watch according to claim 1, characterized in that: The touch layer (2) is ITO bridge, nanosilver or metal mesh.

3. The FPC bending structure of a smart watch according to claim 1, characterized in that: The upper surface of the cover plate (1) is provided with a coating (16).

4. The FPC bending structure of a smart watch according to claim 3, characterized in that: The coating (16) is one of an AG layer, an AR layer, and an AF layer, or a combination of two or more thereof.

5. The FPC bending structure of a smart watch according to claim 1, characterized in that: The back side of the cover plate (1) located in the frame ink area (102) is provided with a first white ink layer (11), a second white ink layer (12), a third white ink layer (13) and a fourth black reverse cover ink layer (14) stacked in sequence from top to bottom, and an ink step difference is formed after the first white ink layer (11), the second white ink layer (12), the third white ink layer (13) and the fourth black reverse cover ink layer (14) are stacked, and a varnish layer (15) is provided on the back side of the cover plate (1), and the varnish layer (15) covers the back side of the cover plate (1) located in the visible area, the back side of the fourth black reverse cover ink layer (14) and the ink step difference.

6. The FPC bending structure of a smart watch according to claim 5, characterized in that: The inner edge of the second white ink layer (12) is located between the inner edge of the first white ink layer (11) and the edge of the cover plate (1).

7. The FPC bending structure of a smart watch according to claim 5, characterized in that: The inner edge of the third white ink layer (13) is located between the inner edge of the second white ink layer (12) and the edge of the cover plate (1).

8. The FPC bending structure of a smart watch according to claim 1, characterized in that: An antistatic rubber ring (5) is provided on the back of the non-display area of ​​the outer ring of the cover plate (1).

9. The FPC bending structure of a smart watch according to claim 1, characterized in that: A first optical adhesive layer (61) is provided on the back of the cover plate (1), the touch layer (2) and the cover plate (1) are bonded via the first optical adhesive layer (61), a TFT panel (7) is provided on the bottom of the touch layer (2), and the TFT panel (7) is bonded to the touch layer (2) via a second optical adhesive layer (62).

10. The FPC bending structure of a smart watch according to claim 9, characterized in that: The first optical adhesive layer (61) and the second optical adhesive layer (62) are OCA or OCR optical adhesives.

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