FPC with green oil

Abstract

The utility model discloses an FPC with green oil, which is characterized in that a bending area of the FPC is thinned and softened, an upper PI film layer and a lower PI film layer on the outermost layer of the FPC are replaced by green oil layers at the bending area of the FPC, after the green oil is applied to the FPC, the green oil can soften the FPC, and the green oil layers can also play a role in corrosion prevention and protection of internal wiring on the upper surface and the lower surface of the FPC. The FPC can be easily bent by 90 degrees after the green oil is added, the outward pulling force disappears after the FPC is bent, the display problem caused by the fact that the connector is loosened by a client can be solved after the FPC is modified into the green oil layer from the complete machine of the client, and the requirements of the client are met under the conditions that other costs are not introduced and the structure of the client is not modified.

Description

Technical Field

[0001] The utility model relates to the technical field of FPC, in particular to an FPC with green oil. Background Art

[0002] AMOLED is widely used in smartwatch projects due to its bright display, high contrast and small screen. Smartwatches are becoming more and more comprehensive, integrating touch, display, NFC payment and other functions. So many functional components need to be integrated in the narrow space of smartwatches, so the layout and placement of components are quite special. In order to meet the aesthetic requirements of customers, the placement of components needs to meet the structural requirements.

[0003] Due to the customer's board, the FPC connector end needs to be bent 90 degrees and the FPC male connector needs to be buckled onto the motherboard female connector. However, since the material of the FPC itself is relatively hard, there will be an outward pulling force during use. As the customer uses the entire machine, the male connector and the female connector on the FPC will loosen, causing poor contact. Utility Model Content

[0004] In order to solve the deficiencies of the above-mentioned prior art, the utility model provides an FPC with green oil. By making the bending area of ​​the FPC thinner and softer, the upper and lower outermost PI film layers of the FPC are replaced with green oil layers at the bending area of ​​the FPC. After the green oil is applied to the FPC, the green oil can soften the FPC because it is thinner and harder than PI. In addition, the green oil layer on the upper and lower surfaces of the FPC can also play a role in corrosion protection for the wiring inside. Therefore, after adding green oil, the FPC can easily achieve a 90-degree bend, and the outward pulling force will disappear after bending. It can be seen from the customer's whole machine that after the modification to the green oil layer, the customer's display problem caused by the loosening of the connector is solved, and the customer's needs are met without introducing other costs or modifying the customer's structure.

[0005] The technical problem to be solved by the utility model is achieved by the following technical scheme: an FPC with green oil, comprising: an FPC, comprising a base layer PI, an upper layer circuit, a lower layer circuit, an upper layer PI and a lower layer PI; the upper layer circuit and the lower layer circuit are respectively arranged on the upper and lower surfaces of the base layer PI, and the upper layer PI and the lower layer PI are respectively arranged on the side of the upper layer circuit and the lower layer circuit away from the base layer PI;

[0006] The FPC surface is provided with a bending area;

[0007] An interface end, the interface end being arranged at one end close to the bending area;

[0008] The upper PI layer and the lower PI layer on the surface of the bending area are provided with window areas, and the upper circuit layer and the lower circuit layer are exposed in the window areas;

[0009] The upper circuit and the lower circuit in the window area are covered with an upper layer of green oil and a lower layer of green oil respectively.

[0010] As a preferred implementation of the 90-degree bendable FPC provided by the present invention, the bending zone has a length of 6.5 mm and a width of 2.4 mm.

[0011] As a preferred implementation of the 90-degree bendable FPC provided by the utility model, a male connector is welded to the interface end.

[0012] As a preferred implementation of the 90-degree bendable FPC provided by the utility model, it also includes a welding end and a TFT liquid crystal screen, and the welding end is welded to the TFT liquid crystal screen.

[0013] As a preferred implementation of the 90-degree bendable FPC provided by the utility model, a reinforcing sheet is provided on the back FPC of the male connector.

[0014] As a preferred implementation of the 90-degree bendable FPC provided by the present invention, the material of the reinforcement sheet is FR4, PI or stainless steel.

[0015] As a preferred implementation of the 90-degree bendable FPC provided by the utility model, the TFT liquid crystal screen includes a lower polarizer, a lower substrate, an upper substrate, an upper polarizer and a cover plate stacked in sequence from bottom to top, the lower substrate is longer than the upper substrate and extends outward to form a step, and the upper surface of the lower substrate located at the step is bound with the FPC and the IC.

[0016] As a preferred implementation of the 90-degree bendable FPC provided by the utility model, a plurality of grooves are formed on the upper surface of the cover plate by etching, and a plastic layer is covered on the upper side of the cover plate, and the plastic layer is embedded in the plurality of grooves.

[0017] As a preferred implementation of the 90-degree bendable FPC provided by the utility model, the groove is a closing groove which is narrow outside and wide inside.

[0018] As a preferred implementation of the 90-degree bendable FPC provided by the present invention, the shape of the groove is square or circular.

[0019] The utility model has the following beneficial effects: an FPC with green oil, comprising: an FPC, comprising a base layer PI, an upper circuit, a lower circuit, an upper PI and a lower PI; the upper and lower surfaces of the base layer PI are respectively provided with the upper circuit and the lower circuit, and the upper and lower PI are respectively provided on the side of the upper circuit and the lower circuit away from the base layer PI; the surface of the FPC is provided with a bending area; an interface end, the interface end is provided at one end close to the bending area; the upper PI and the lower PI on the surface of the bending area are provided with a window area, the window area exposes the upper circuit and the lower circuit; the window area is covered with a green oil layer. The present application makes the bending area of ​​the FPC thinner and softer, and replaces the upper and lower PI film layers of the outermost layer of the FPC with a green oil layer at the bending area of ​​the FPC. After the green oil is applied to the FPC, the green oil can soften the FPC because it is thinner and harder than PI, and the green oil layer on the upper and lower surfaces of the FPC can also play a role in corrosion protection of the wiring inside. Therefore, after adding the green oil, the FPC can be easily bent, and the outward pulling force will disappear after bending. It can be seen from the customer's whole machine that after changing to the green oil layer, the customer's display problem caused by the loose connector is solved, and the customer's needs are met without introducing other costs or modifying the customer's structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of a bending area of ​​a FPC with green oil provided by the utility model;

[0022] Figure 2 A connection diagram of a FPC and a TFT LCD screen with green oil provided by the utility model;

[0023] Figure 3 A schematic diagram of the structure of an FPC with green oil provided by the utility model;

[0024] Figure 4 A schematic diagram of the bending area structure of a FPC with green oil provided by the utility model;

[0025] Figure 5 A schematic diagram of an FPC interface end reinforcement sheet with green oil provided by the utility model;

[0026] Figure 6 A schematic diagram of the structure of a TFT liquid crystal screen with a green oil FPC provided by the utility model;

[0027] Figure 7 A schematic diagram of the structure of a TFT liquid crystal screen cover plate with a green oil FPC provided by the utility model;

[0028] Figure 8 for Figure 7 Schematic diagram of the decomposition structure;

[0029] Fig. 9 for Figure 7 Improved structural diagram.

[0030] 1. FPC; 101. Base PI; 102. Upper circuit; 103. Lower circuit; 104. Upper PI; 105. Lower PI; 106. Upper green oil; 107. Lower green oil; 11. Bending area; 12. Interface end; 13. Welding end; 121. Male connector; 122. Reinforcement sheet; 2. TFT LCD; 21. Lower polarizer; 22. Lower substrate; 23. Upper substrate; 24. Upper polarizer; 25. Cover; 251. Groove; 26. Plastic layer; 3. IC. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Embodiment 1

[0036] like Figure 1-4 As shown, an FPC with green oil includes: FPC1, including a base layer PI101, an upper layer circuit 102, a lower layer circuit 103, an upper layer PI104 and a lower layer PI105; the upper and lower surfaces of the base layer PI101 are respectively provided with the upper layer circuit 102 and the lower layer circuit 103, and the upper layer PI104 and the lower layer PI105 are respectively provided on the surface of the upper layer circuit 102 and the lower layer circuit 103 away from the base layer PI101;

[0037] The surface of the FPC1 is provided with a bending area 11;

[0038] An interface end 12, the interface end 12 is arranged at one end close to the bending area 11;

[0039] The upper PI 104 and the lower PI 105 on the surface of the bending area 11 are provided with window areas, and the upper circuit 102 and the lower circuit 103 are exposed in the window areas;

[0040] The upper circuit 102 and the lower circuit 103 in the window area are covered with an upper green oil 106 and a lower green oil 107 respectively.

[0041] This application makes the bending area 11 of FPC1 thinner and softer, and replaces the upper PI104 and lower PI105 of the outermost layer of FPC1 with upper green oil 106 and lower green oil 107 at the bending area 11 of FPC. After green oil is applied to FPC1, since green oil is thinner and harder than PI, it can soften FPC1, and the green oil layer on the upper and lower surfaces of FPC1 can also play a role in corrosion protection of the wiring inside. Therefore, after adding green oil, FPC1 can easily achieve 90-degree bending, and the outward pulling force will disappear after bending. It can be seen from the customer's whole machine that after changing to the green oil layer, the customer's display problem caused by the loose connector is solved, and the customer's needs are met without introducing other costs or modifying the customer's structure.

[0042] It should be noted that the green oil is an organic synthetic resin, which is usually composed of resins such as epoxy resin, acrylic resin, phenolic resin, solvents, pigments, etc. Among them, epoxy resin is the main component, which has good adhesion, chemical resistance and heat resistance, and can effectively protect the FPC surface and internal wiring. Acrylic resin and phenolic resin can improve the hardness and wear resistance of green oil, making it more durable. Solvents are used to dilute the resin to make it more coatable. Pigments are used to adjust the color of green oil, which is usually green or transparent.

[0043] In another preferred implementation manner of this embodiment, the bending area 11 has a length of 6.5 mm and a width of 2.4 mm.

[0044] Embodiment 2

[0045] In this embodiment, a male connector 121 is welded to the interface end 12. The male connector 121 is buckled with the motherboard female connector.

[0046] In another preferred implementation of this embodiment, Figure 5 As shown, a reinforcing sheet 122 is provided on the back FPC1 of the male connector 121 .

[0047] Furthermore, the material of the reinforcing sheet 122 is FR4, PI or stainless steel. The function of the reinforcing sheet 122 is to enhance the connection stability and reliability between the male connector 121 and the motherboard female connector. The material of the reinforcing sheet 122 can be FR4, PI or stainless steel, which has good mechanical strength and wear resistance and can effectively protect the connector and FPC. This ensures that the interface end 12 is not prone to loosening or breaking during use, thereby improving the service life and reliability of the product.

[0048] The 90-degree bendable FPC provided by the utility model further comprises a welding end 13 and a TFT liquid crystal screen 2 , wherein the welding end 13 is welded to the TFT liquid crystal screen 2 .

[0049] like Figure 6 As shown, the TFT liquid crystal screen 2 includes a lower polarizer 21, a lower substrate 22, an upper substrate 23, an upper polarizer 24 and a cover plate 25 which are stacked in sequence from bottom to top. The lower substrate 22 is longer than the upper substrate 23 and extends outward to form a step. The upper surface of the lower substrate 22 located at the step is bound with FPC1 and IC3.

[0050] Embodiment 3

[0051] like Figure 7-9 As shown, a plurality of grooves 251 are formed on the upper surface of the cover plate 25 by etching, and a plastic layer 26 is covered on the upper side of the cover plate 25 , and the plastic layer 26 is embedded in the plurality of grooves 251 .

[0052] In this embodiment, the upper surface of the cover plate 25 is covered with a plastic layer 26, and a plurality of grooves 251 are formed downwardly on the upper surface of the cover plate 25 by etching, and a portion of the lower surface of the plastic layer 26 is embedded in each groove 251. Since the surface of the groove 251 formed by etching has a certain degree of roughness, the plastic layer 26 can be tightly bonded to the groove 251, thereby preventing the cover plate 25 and the plastic layer 26 from falling off. Since the upper part of the cover plate 25 is covered with a plastic layer 26, and a plurality of grooves 251 are formed on the upper surface of the cover plate 25 by etching, and the plastic layer 26 can be embedded in the interior of the plurality of grooves 251, the grooves 251 formed by etching make the inner surface of the grooves 251 have a certain degree of roughness, and the surface of the grooves 251 with a certain degree of roughness can enhance the bonding force between the grooves 251 and the plastic layer 26, thereby reducing the possibility of separation of the grooves 251 and the plastic layer 26. When the LCD screen is hit or falls, the plastic layer 26 on the upper surface of the cover plate 25 can directly withstand the external force, thereby preventing the external force from directly acting on the cover plate 25. Since the plastic layer 26 can absorb most of the energy, the remaining external force is very weak when it acts on the cover plate 25, thereby effectively reducing the risk of the cover plate 25 being broken or damaged; and when the LCD screen is subjected to external force, even if the external force is large, it will only damage the plastic layer 26 on the upper surface of the cover plate 25, and will not directly damage the cover plate 25, thereby preventing the cover plate 25 from being damaged and causing the LCD screen to be unable to be used normally, thereby bringing a better user experience to users and improving the anti-fall ability of the LCD screen.

[0053] Furthermore, the shape of the groove 251 can be square or circular, and the cross-sectional shape of the groove 251 can be a closing groove that is narrow on the outside and wide on the inside. In the present embodiment, the cross-sectional shape of the groove 251 is an isosceles trapezoid, and the groove 251 is in the shape of an elongated strip. The isosceles trapezoid-shaped groove 251 can allow the plastic layer 26 to be tightly embedded in the groove 251, thereby preventing the groove 251 from separating from the plastic layer 26, thereby preventing the cover plate 25 from falling off from the plastic layer 26. The elongated groove 251 can increase the fitting portion between the plastic layer 26 and the groove 251, thereby increasing the fitting strength between the groove 251 and the plastic layer 26.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the utility model rather than to limit them. Although the embodiments of the utility model are described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the utility model can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. An FPC with green oil, characterized in that, include: The FPC (1) comprises a base layer PI (101), an upper layer circuit (102), a lower layer circuit (103), an upper layer PI (104) and a lower layer PI (105); the upper layer circuit (102) and the lower layer circuit (103) are respectively arranged on the upper and lower surfaces of the base layer PI (101); and the upper layer PI (104) and the lower layer PI (105) are respectively arranged on the surfaces of the upper layer circuit (102) and the lower layer circuit (103) away from the base layer PI (101); The surface of the FPC (1) is provided with a bending area (11); An interface end (12), the interface end (12) being arranged at an end close to the bending area (11); The upper layer PI (104) and the lower layer PI (105) on the surface of the bending area (11) are provided with window areas, and the window areas expose the upper layer circuit (102) and the lower layer circuit (103); The upper circuit (102) and the lower circuit (103) in the window area are covered with an upper green oil (106) and a lower green oil (107) respectively.

2. The FPC with green oil as claimed in claim 1, characterized in that: The bending area (11) has a length of 6.5 mm and a width of 2.4 mm.

3. The FPC with green oil as claimed in claim 1, characterized in that: The interface end (12) is welded with a male connector (121).

4. The FPC with green oil as claimed in claim 1, characterized in that: It also comprises a welding end (13) and a TFT liquid crystal screen (2), wherein the welding end (13) is welded to the TFT liquid crystal screen (2).

5. The FPC with green oil as claimed in claim 3, characterized in that: A reinforcing sheet (122) is provided on the FPC (1) at the back of the male connector (121).

6. The FPC with green oil as claimed in claim 5, characterized in that: The material of the reinforcement sheet (122) is FR4, PI or stainless steel.

7. The FPC with green oil as claimed in claim 4, characterized in that: The TFT liquid crystal screen (2) comprises a lower polarizer (21), a lower substrate (22), an upper substrate (23), an upper polarizer (24) and a cover plate (25) which are stacked in sequence from bottom to top; the lower substrate (22) is longer than the upper substrate (23) and extends outward to form a step; an FPC (1) and an IC (3) are bound to the upper surface of the lower substrate (22) located at the step.

8. The FPC with green oil as claimed in claim 7, characterized in that: A plurality of grooves (251) are formed on the upper surface of the cover plate (25) by etching, and a plastic layer (26) is covered on the upper side of the cover plate (25), wherein the plastic layer (26) is embedded in the plurality of grooves (251).

9. The FPC with green oil as claimed in claim 8, characterized in that: The groove (251) is a closing groove that is narrow on the outside and wide on the inside.

10. The FPC with green oil as claimed in claim 8, characterized in that: The groove (251) is in a square or circular shape.

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