Display screen COF binding structure

Abstract

The utility model relates to a display screen COF binding structure which comprises a main body, the main body is connected with a connecting piece, the connecting piece comprises a bending part and a connecting part, the length of the connecting part is larger than that of the bending part, and an included angle formed at the connecting position of the connecting part and the bending part is smaller than 105 degrees. The application has the effect of improving the matching stability of the FPC and the ACF.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a COF binding structure for a display screen. Background Art

[0002] Flexible Printed Circuit (FPC) has the advantages of bendability, flexibility, high-density wiring and shock resistance. It is widely used in smart phones, tablet computers and wearable devices.

[0003] For example, in wearable devices, flexible circuit boards are usually connected to display panels such as AMOLED (Active-Matrix Organic Light-Emitting Diode) or LED (Light Emitting Diode). In the existing technology, the binding area is relatively narrow, and the matching method is mostly COF (Chip-on-Film). COF relies on anisotropic conductive film (ACF) for connection. Compared with other smartphone-type COG (Chip-on-Glass) + FOG (Finger on Glass) binding methods, the connection strength between the two is significantly different, and COF and ACF are prone to detachment. In actual application, the detachment of COF and ACF usually starts from the edge positions on both sides of COF, which makes the connection between COF and ACF unstable and causes the device to fail to work properly. Utility Model Content

[0004] In order to improve the stability of the cooperation between FPC and ACF, the present application provides a display screen COF binding structure.

[0005] The COF binding structure of a display screen provided in this application adopts the following technical solution:

[0006] A display screen COF binding structure comprises a main body, the main body is connected to a connecting piece, the connecting piece comprises a bending portion and a connecting portion, the length of the connecting portion is greater than the length of the bending portion, and the angle formed by the connection between the connecting portion and the bending portion is less than 105°.

[0007] By adopting the above technical solution, since the length of the connecting portion is greater than the length of the bending portion, the stress generated when the bending portion is bent along the connecting portion is dispersed to the connecting portion. At the same time, the angle formed by the connecting portion and the bending portion is less than 105°, which helps to further alleviate the stress at the connection between the connecting portion and the bending portion, to a certain extent alleviate the fatigue effect that may be caused by long-term use or frequent bending, and improve the stability of the connection between the connecting portion and the bending portion.

[0008] Preferably, the difference between the length of the connecting portion and the length of the bending portion is greater than 1.00 mm.

[0009] By adopting the above technical solution and utilizing the difference in length between the connecting portion and the bending portion, a larger connection area is provided for the connection between the connecting portion and the ACF, thereby enhancing the stability of the overall structure and helping to resist the mechanical stress generated during bending and the vibration generated during operation.

[0010] Preferably, the connection between the connecting portion and the bending portion is rounded.

[0011] By adopting the above technical solution, the rounded corner design makes the connection between the connecting part and the bending part softer, reducing the risk of cracks or breakage when the bending part is bent, and also reduces the wear of the connection caused by friction and external impact.

[0012] Preferably, a positioning piece is provided on the connecting portion, and the positioning piece is plug-fitted with the ACF.

[0013] By adopting the above technical solution, the position guiding effect of the positioning member can make the connecting part accurately aligned when installed on the ACF. At the same time, since the positioning frame is plugged into the ACF, the stability of the bending part during bending is improved, which reduces the occurrence of the connection part detaching along the ACF due to excessive bending.

[0014] Preferably, a fiber mesh is provided at the connection between the connecting portion and the bending portion.

[0015] By adopting the above technical solution, the fiber mesh enhances the physical strength and tensile strength of the connection between the connecting portion and the bending portion to a certain extent, and also provides certain support for the connecting portion and the bending portion.

[0016] Preferably, a PI film is provided on the upper surface of the bending portion.

[0017] By adopting the above technical solution, the PI film has excellent flexibility and bending performance, and can withstand bending and twisting without being easily damaged. At the same time, the PI film can absorb and disperse mechanical stress, reduce the stress concentration generated in the bent part, and the PI film can be used as a protective layer to protect the bent part and the circuit elements of the main body from external environmental damage, such as corrosion by dust, moisture or chemicals.

[0018] Preferably, a rubber sleeve is provided on the connecting portion, and the rubber sleeve is sleeved on the connecting portion along the top end of the connecting portion, and the width of the rubber sleeve is greater than the width of the connecting portion.

[0019] By adopting the above technical solution, the installation of the rubber sleeve can provide additional support and enhance the stability of the connection. The width of the rubber sleeve is greater than the width of the connection to ensure that the connection is more secure under the wrapping of the rubber sleeve and reduce the possibility of loosening or falling off of the connection. At the same time, the rubber sleeve has the function of buffering and absorbing vibration, which helps to reduce the impact of external mechanical vibration on the connection, and the protective effect of the rubber sleeve can increase the durability of the connection and reduce damage to the connection caused by external environment or stress.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] 1. Because the length of the connecting portion is greater than that of the bending portion, the stress generated when the bending portion is bent along the connecting portion is dispersed to the connecting portion. At the same time, the angle formed by the connecting portion and the bending portion is less than 105°, which helps to further relieve the stress at the connection between the connecting portion and the bending portion, and to a certain extent alleviates the fatigue effect that may be caused by long-term use or frequent bending, and improves the stability of the connection between the connecting portion and the bending portion;

[0022] 2. Utilize the difference between the length of the connecting part and the bending part to provide a larger connection area between the connecting part and the ACF, thereby enhancing the stability of the overall structure and helping to resist the mechanical stress generated during bending and the vibration generated during operation;

[0023] 3. The fiber mesh enhances the physical strength and tensile strength of the connection between the connecting part and the bending part to a certain extent, and also provides certain support for the connecting part and the bending part. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of a display screen COF binding structure in an embodiment of the present application.

[0025] Figure 2 It is a cross-sectional schematic diagram of the matching relationship between the rubber sleeve and the bending part.

[0026] Explanation of the accompanying drawings: 1. Main body; 2. Connecting part; 21. Bending part; 22. Connecting part; 221. Inserting part; 222. Extending part; 3. Angle; 4. Positioning part; 5. Fiber mesh; 6. PI film; 7. Rubber sleeve. DETAILED DESCRIPTION

[0027] The directions mentioned or possibly mentioned in this specification, such as up, down, left, right, front, back, side, above, below, etc., are used to be defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directions should not be interpreted as restrictive terms.

[0028] The following is combined with Figure 1-Figure 2 This application is described in further detail.

[0029] The present application embodiment discloses a display screen COF binding structure. Figure 1 and Figure 2 A display screen COF binding structure includes a main body 1, the main body 1 is connected to a connecting member 2, the connecting member 2 includes a bending portion 21 and a connecting portion 22, the length of the connecting portion 22 is greater than the length of the bending portion 21, and the angle 3 formed by the connecting portion 22 and the bending portion 21 is less than 105°.

[0030] Specifically, the connecting portion 22 includes an extending portion 222 and a plug-in portion 221. The connecting portion 22 and the plug-in portion 221 are integrally formed, the bending portion 21 is fixedly connected to the plug-in portion 221, and a plurality of electronic components are distributed on the main body 1 for realizing specific functions of the flexible board. At the same time, the plug-in portion 221 is installed with a connector along its length direction for alignment with the ACF. Its specific composition and working principle are not described in detail here.

[0031] Therefore, since the length of the connecting portion 22 is greater than the length of the bending portion 21, the stress generated when the bending portion 21 is bent along the connecting portion 22 is dispersed to the connecting portion 22. At the same time, the angle 3 formed by the connecting portion 22 and the bending portion 21 is less than 105°, which helps to further alleviate the stress at the connection between the connecting portion 22 and the bending portion 21, to a certain extent reduce the fatigue effect that may be caused by long-term use or frequent bending, and improve the stability of the connection between the connecting portion 22 and the bending portion 21.

[0032] Reference Figure 1 The difference between the length of the connecting portion 22 and the length of the bending portion 21 is greater than 1.00 mm, and the connection between the connecting portion 22 and the bending portion 21 is rounded.

[0033] Specifically, in this embodiment, the length of the plug-in portion 221 is 10.38 mm (SI, millimeters). At the same time, two extension portions 222 are provided, and the two extension portions 222 are respectively provided at both ends of the plug-in portion 221 along the length direction of the plug-in portion 221. The length of any extension portion 222 is 0.56 mm, and the length of the bending portion 21 is 10.38 mm.

[0034] In the example before improvement: the length of the plug-in portion 221 is 6.16±0.1mm, and at the same time, the length of any extension portion 222 is 0.25mm, and the length of the bending portion 21 is 6.16±0.1mm, so that the angle 3 formed at the connection between the plug-in portion 221 and the extension portion 222 and the bending portion 21 is greater than 105°.

[0035] It should be noted that the width of the connection portion 22 can also be changed according to actual needs, and the width of the connection portion 22 will not be described here.

[0036] Furthermore, with the center lines of the connecting portion 22 and the bending portion 21 as the boundary, the connecting portion 22 and the bending portion 21 are arranged symmetrically. The following description will be made by taking the left half area of ​​the connecting portion 22 and the bending portion 21 as an example.

[0037] Therefore, for the example before improvement, in the left half of the connecting portion 22 and the bending portion 21, the length of the plug-in portion 221 plus the extension portion 222 is equal to 3.33 mm, and the length of the left half of the bending portion 21 is 3.08 mm, and the difference between the two in the left half is 0.25 mm. At the same time, in the present embodiment, in the left half of the connecting portion 22 and the bending portion 21, the length of the plug-in portion 221 plus the extension portion 222 is 5.75 mm, and the length of the left half of the bending portion 21 is 5.19 mm, and the difference between the two in the left half is 0.56 mm, so that the angle 3 formed at the connection between the plug-in portion 221 and the extension portion 222 and the bending portion 21 is less than 105°. The above method helps to further relieve the stress at the connection between the connecting portion 22 and the bending portion 21.

[0038] Therefore, in this embodiment, the length of the extension portion 222 is increased, and the corresponding angle 3 formed at the connection between the plug-in portion 221 and the bending portion 21 is reduced compared with the example before improvement. During the bending process of the bending portion 21, the stress at the connection between the plug-in portion 221 and the bending portion 21 is released by the extension portion 222, which to a certain extent reduces the fatigue effect that may occur under long-term use or frequent bending, and improves the stability of the connection between the plug-in portion 221 and the bending portion 21.

[0039] In addition, the radius of the fillet can be changed according to the width of the bending portion 21. The rounded corner design makes the connection between the connecting portion 22 and the bending portion 21 softer, reducing the risk of cracks or breakage when the bending portion 21 is bent, and also reduces the wear of the connection caused by friction and external impact.

[0040] Reference Figure 1 A positioning member 4 is provided on the connecting portion 22, and the positioning member 4 is plugged into and matched with the ACF.

[0041] Specifically, two positioning members 4 are provided, and the external contours of the two positioning members 4 are arranged in a "cross" shape. The two positioning members 4 are respectively installed on the two extension parts 222, and the two positioning members 4 face the upper surface of the ACF. At the same time, the upper surface of the ACF that cooperates therewith is provided with a plug-in groove (not shown in the figure). Therefore, through the position guiding effect of the positioning member 4, the connecting part 22 can be accurately aligned when installed on the ACF. At the same time, since the positioning frame is plug-in-fitted with the ACF, the stability of the bending part 21 during bending is improved, and to a certain extent, the occurrence of the connection part 22 detaching along the ACF due to excessive bending amplitude is reduced.

[0042] Reference Figure 1 A fiber mesh 5 is provided at the connection between the connecting portion 22 and the bending portion 21 , and a PI film 6 is provided on the upper surface of the bending portion 21 .

[0043] Specifically, the outer contour of the fiber mesh 5 is set in a rectangular shape, which is a mesh structure. One end of the fiber mesh 5 is fixedly connected to the plug-in portion 221, and the other end of the fiber mesh 5 is fixedly connected to the bending portion 21. In the present embodiment, the material of the fiber mesh 5 is polyamide fiber mesh (Polyamide Fiber Mesh). Therefore, by utilizing the characteristics of the polyamide fiber material itself having certain ductility and excellent heat resistance and corrosion resistance, the fiber mesh 5 enhances the physical strength and tensile strength of the connection between the connecting portion 22 and the bending portion 21 to a certain extent, and also provides certain support for the connecting portion 22 and the bending portion 21.

[0044] Furthermore, the outer contour of the PI film 6 (Polyimide Film) is adapted to the contours of the bending portion 21 and the main body 1. The PI film 6 is bonded to the bending portion 21 and the main body 1. The PI film 6 is a high-performance polymer material with excellent mechanical strength and rigidity, which enables it to perform excellently in high-strength and low-deformation applications. It also has good tensile, bending and tearing resistance. Therefore, the stress generated when the bending portion 21 is bent is released through the PI film 6, further reducing the stress concentration generated in the bending portion 21. The PI film 6 can be used as a protective layer to protect the circuit elements of the bending portion 21 and the main body 1 from being damaged by the external environment, such as corrosion by dust, moisture or chemicals.

[0045] Reference Figure 1 and Figure 2 A rubber sleeve 7 is provided on the connecting portion 22 , and the rubber sleeve 7 is sleeved on the connecting portion 22 along the top end of the connecting portion 22 , and the width of the rubber sleeve 7 is greater than the width of the connecting portion 22 .

[0046] Specifically, the outer contour of the rubber sleeve 7 is compatible with the outer contour of the plug-in portion 221 and the extension portion 222, and the lower surface of the rubber sleeve 7 is open. When the rubber sleeve 7 is sleeved along the plug-in portion 221 and the extension portion 222, the rubber sleeve 7 is simultaneously sleeved on a partial area on the bending portion 21. Therefore, the sleeve of the rubber sleeve 7 can provide additional support and enhance the stability of the connecting portion 22. The width of the rubber sleeve 7 is greater than the width of the connecting portion 22 to ensure that the connecting portion 22 is more secure under the wrapping of the rubber sleeve 7 and reduce the possibility of loosening or falling off of the connecting portion 22. At the same time, the rubber sleeve 7 has the function of buffering and absorbing vibration, which helps to reduce the impact of external mechanical vibration on the connecting portion 22, and the protective effect of the rubber sleeve 7 can increase the durability of the connecting portion 22 and reduce damage to the connecting portion 22 caused by the external environment or stress.

[0047] The implementation principle of a display COF binding structure in an embodiment of the present application is as follows: the length of the connecting portion 22 is set to be greater than the length of the bending portion 21, and the connection between the connecting portion 22 and the bending portion 21 is rounded. At the same time, the angle formed by the connection between the connecting portion 22 and the bending portion 21 is less than 105°, thereby dissipating the stress generated when the bending portion 21 is bent along the connecting portion 22 to the connecting portion 22. The difference in length between the connecting portion 22 and the bending portion 21 is used to provide a larger connection area for the connection between the connecting portion 22 and the ACF, thereby enhancing the stability of the overall structure and helping to resist the mechanical stress generated during bending and the vibration generated during operation. The rounded corner design makes the connection between the connecting portion 22 and the bending portion 21 softer, reducing the risk of cracks or breakages when the bending portion 21 is bent, and also reducing the wear of the connection due to friction and external impact.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A display screen COF binding structure, characterized in that: The invention comprises a main body (1), wherein the main body (1) is connected to a connecting piece (2), wherein the connecting piece (2) comprises a bending portion (21) and a connecting portion (22), wherein the length of the connecting portion (22) is greater than the length of the bending portion (21), and the angle (3) formed at the connection between the connecting portion (22) and the bending portion (21) is less than 105°.

2. A display screen COF binding structure according to claim 1, characterized in that: The difference between the length of the connecting portion (22) and the length of the bending portion (21) is greater than 1.00 mm.

3. A display screen COF binding structure according to claim 1, characterized in that: The connection between the connecting portion (22) and the bending portion (21) is rounded.

4. The display screen COF binding structure according to claim 1, characterized in that: The connection portion (22) is provided with a positioning piece (4), and the positioning piece (4) is plug-fitted with the ACF.

5. The display screen COF binding structure according to claim 1, characterized in that: A fiber mesh (5) is provided at the connection between the connecting portion (22) and the bending portion (21).

6. The display screen COF binding structure according to claim 1, characterized in that: A PI film (6) is provided on the upper surface of the bending portion (21).

7. The display screen COF binding structure according to claim 1, characterized in that: A rubber sleeve (7) is provided on the connecting portion (22), and the rubber sleeve (7) is sleeved on the connecting portion (22) along the top end of the connecting portion (22), and the width of the rubber sleeve (7) is greater than the width of the connecting portion (22).

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