A COF protection structure for display module

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In the display module of the smart wearable device, double-sided adhesive foam is attached to the back of the COF driver chip to form a protective layer, which solves the problem of COF breaking or fracturing the main screen glass due to external stress during assembly, and improves product reliability and production yield.

CN222734619UActive Publication Date: 2025-04-08TRULY OPTO ELECTRONICS

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Patent Information

Application Number: CN202421324476.6
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-06-11
Publication Date: 2025-04-08
Estimated Expiration: 2034-06-11

AI Technical Summary

Technical Problem

During the display module assembly process of smart wearable devices, COF is prone to damage or fracturing the main screen glass due to external stress, resulting in display abnormalities and module scrapping.

Method used

Design a COF protective structure of the display module, and by attaching double-sided adhesive foam to the back of the COF driver chip, it forms a barrier protective layer to protect COF and main screen glass.

Benefits of technology

It effectively avoids damage or fracturing the main screen glass due to external stress during assembly, reduces the incidence of poor function, and improves production yield and product reliability.

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Abstract

A COF protection structure of a display module, comprising: a display glass substrate, a touch FPC, a COF and a display FPC; a display module upper cover is arranged on the front of the display glass substrate, and a cover protective film is attached to the display module upper cover; the touch FPC is arranged at the center of the top of the display glass substrate, the COF is arranged at the center of the bottom of the display glass substrate, and a display FPC is arranged at the bottom of the COF; a double-sided sticky foam is arranged on the back of the COF. The COF protection structure of the display module of the utility model, by attaching a protective foam with a composite double-sided sticky front and back on the back of the COF driver chip, avoids chip damage or screen cracking and other functional malfunctions caused by pressing the COF driver chip during production or customer installation, thereby improving production yield and product reliability.

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Description

Technical Field

[0001] The utility model relates to the technical field of display modules, in particular to a COF protection structure of a display module. Background Art

[0002] With the improvement of living standards, smart wearable devices such as watches and bracelets are becoming more and more common. In order to pursue a high screen-to-body ratio, equipment manufacturers have increasingly stringent requirements on the border size of display modules. Therefore, mid-to-high-end display screens will use COF-packaged driver chips and AMOLED glass to achieve high resolution and narrow-border module design requirements. However, during the module assembly process, the COF needs to be bent and attached to the back of the screen. Once subjected to external stress, the IC on the COF is easily damaged or the main screen glass is cracked, resulting in display abnormalities and causing the entire module to be scrapped. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a COF protection structure for a display module.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A COF protection structure of a display module comprises: a display glass substrate, a touch FPC, a COF and a display FPC; a display module upper cover is arranged on the front of the display glass substrate, and a cover protective film is attached to the display module upper cover; the touch FPC is arranged at the center of the top of the display glass substrate, the COF is arranged at the center of the bottom of the display glass substrate, and the display FPC is arranged at the bottom of the COF; a double-sided adhesive foam is arranged on the back of the COF, the shape of the front of the double-sided adhesive foam is the same as the shape of the front of the COF, and the height, length and width of the front of the double-sided adhesive foam are 4.65 mm, 9.7 mm and 0.2 mm respectively.

[0006] In one embodiment, the shape and size of the front side of the display module upper cover plate are matched with the shape and size of the front side of the display screen glass substrate, and the shape and size of the front side of the cover plate protective film are the same as the shape and size of the front side of the display module upper cover plate.

[0007] In one of the embodiments, a cover plate protective film tearing handle is provided at the center of the right side of the front side of the cover plate protective film.

[0008] In one of the embodiments, a first double-sided adhesive is provided on the left side of the back of the touch FPC, a protective film is attached to the back of the first double-sided adhesive, a first double-sided adhesive tear handle is provided on the left side of the top of the protective film, and a PI reinforcement plate is provided on the back of the gold finger at the top right side of the front of the touch FPC.

[0009] In one embodiment, a COF chip is disposed at the center of the front surface of the COF, and the COF is connected to the display glass substrate via gold fingers, while the bottom of the COF is connected to the display FPC via gold fingers.

[0010] In one embodiment, the front side of the double-sided adhesive foam is narrow at the top and wide at the bottom, the upper part is an isosceles trapezoid and the lower part is a rectangle, and the double-sided adhesive foam is attached to the center of the back of the COF and corresponds to the COF chip.

[0011] In one of the embodiments, a connector is disposed on the left block at the bottom of the front side of the display FPC, and a second double-sided adhesive is attached to the back of the connector.

[0012] In one embodiment, the shape and size of the front side of the second double-sided adhesive are the same as the shape and size of the front side of the block body at the right side of the bottom front side of the display FPC.

[0013] In one of the embodiments, a steel sheet is provided at the back of the connector on the front side of the display FPC for reinforcement.

[0014] In one embodiment, a tear-off film is attached to the back of the second double-sided adhesive, and a tear-off handle is provided on the left side of the tear-off film.

[0015] Compared with the prior art, the utility model has at least the following advantages:

[0016] The COF protection structure of the display module of the present invention attaches a protective foam with double-sided adhesive on the back of the COF driver chip, so that when the COF is bent and attached to the back of the screen, the foam on the back of the COF will form a barrier protection layer. Even if the IC on the COF is subjected to external stress, the main screen glass will not be cracked to cause display abnormalities. Therefore, chip breakage or screen cracking and other malfunctions caused by pressing the COF driver chip during production or customer installation are avoided, thereby improving production yield and product reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the overall front side of the COF protection structure of the display module of the present invention;

[0019] Figure 2 It is an overall schematic diagram of the back of the COF protection structure of the display module of the present invention.

[0020] In the figure: 1. display glass substrate; 11. display module upper cover; 12. cover protective film; 121. cover protective film tearing handle; 2. touch FPC; 21. first double-sided adhesive; 211. first double-sided adhesive tearing handle; 22. PI reinforcement board; 3. COF; 31. double-sided adhesive foam; 4. display FPC; 41. connector; 42. second double-sided adhesive; 43. steel sheet reinforcement. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0022] In the description of the present application, 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 drawings, and are only for the convenience of describing the present application 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 should not be understood as a limitation on the present application.

[0023] Unless otherwise clearly stipulated and limited, terms such as "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] like Figure 1-2As shown, a COF protection structure of a display module includes: a display glass substrate 1, a touch FPC2, a COF3 and a display FPC4; a display module upper cover plate 11 is arranged on the front of the display glass substrate 1, and a cover plate protective film 12 is attached to the display module upper cover plate 11; the touch FPC2 is arranged at the center of the top of the display glass substrate 1, the COF3 is arranged at the center of the bottom of the display glass substrate 1, and the display FPC4 is arranged at the bottom of the COF3; a double-sided adhesive foam 31 is arranged on the back of the COF3, and the shape of the front of the double-sided adhesive foam 31 is the same as the shape of the front of the COF3, and the height of the front of the double-sided adhesive foam 31 is 4.65mm, the length is 9.7mm, and the width is 0.2mm. It should be noted that the display glass substrate 1 is round or square, and its shape and size specifications are designed according to the requirements of the manufacturer. This technical solution only shows the design when it is round, and only shows the design idea of the solution.

[0026] like Figure 1-2 As shown, in one embodiment, the shape and size of the front of the display module upper cover plate 11 are adapted to the shape and size of the front of the display screen glass substrate 1, and the shape and size of the front of the cover plate protective film 12 are the same as the shape and size of the front of the display module upper cover plate 11. A cover plate protective film tearing handle 121 is provided in the center of the right side of the front of the cover plate protective film 12. It should be noted that this design facilitates the staff to tear the cover plate protective film 12 from the display module upper cover plate 11 through the cover plate protective film tearing handle 121 after completing the production and assembly.

[0027] like Figure 1-2 As shown, in one embodiment, a first double-sided adhesive 21 is provided on the left side of the back of the touch FPC2, a protective film is attached to the back of the first double-sided adhesive 21, a first double-sided adhesive tearing handle 211 is provided on the left side of the top of the protective film, and a PI reinforcing plate 22 is provided on the back of the gold finger at the top right side of the front of the touch FPC2. It should be noted that the PI reinforcing plate 22 can enhance the strength of the gold finger of the touch FPC2, and the first double-sided adhesive tearing handle 211 can facilitate the staff to tear off the protective film on the first double-sided adhesive 21 after completing the installation.

[0028] like Figure 1-2 As shown, in one embodiment, a COF chip is arranged in the center of the front of COF3, and COF3 is connected to the display glass substrate 1 through a gold finger, and its bottom is connected to the display FPC4 through a gold finger. The front of the double-sided adhesive foam 31 is narrow at the top and wide at the bottom, the upper part is an isosceles trapezoid and the lower part is a rectangle, and the double-sided adhesive foam 31 is attached to the center of the back of COF3 and corresponds to the COF chip. It should be noted that this design allows the double-sided adhesive foam 31 to be attached to the display glass substrate 1 when COF3 is bent to the back of the display glass substrate 1, thereby playing a protective role.

[0029] like Figure 1-2 As shown, in one embodiment, a connector 41 is provided on the left block at the bottom of the front side of the display FPC 4, and a second double-sided adhesive 42 is attached to the back of the connector 41. The shape and size of the front side of the second double-sided adhesive 42 are the same as the shape and size of the front side of the right block at the bottom of the front side of the display FPC 4. It should be noted that this design allows the second double-sided adhesive 42 to attach the bent display FPC 4 to the back of the display screen glass substrate 1, and the shape and size of the front side of the display FPC 4 are smaller than the display screen glass substrate 1.

[0030] like Figure 1-2 As shown, in one embodiment, a steel sheet reinforcement 43 is provided at the back of the front connector 41 of the display FPC 4. It should be noted that this design can enhance the strength of the connector 41 on the display FPC 4.

[0031] like Figure 1-2 As shown, in one embodiment, a tear-off film is attached to the back of the second double-sided adhesive 42, and a tear-off handle is provided on the left side of the tear-off film. It should be noted that this design allows the tear-off film to protect the second double-sided adhesive 42 from external influences before use.

[0032] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A COF protection structure of a display module, characterized in that: include: Display glass substrate (1), touch FPC (2), COF (3) and display FPC (4); A display module upper cover plate (11) is arranged on the front of the display screen glass substrate (1), and a cover plate protective film (12) is attached to the display module upper cover plate (11); The touch FPC (2) is arranged at the center of the top of the display glass substrate (1), the COF (3) is arranged at the center of the bottom of the display glass substrate (1), and a display FPC (4) is arranged at the bottom of the COF (3); The back of the COF (3) is provided with a double-sided adhesive foam (31), the front side of the double-sided adhesive foam (31) has the same shape as the front side of the COF (3), and the front side of the double-sided adhesive foam (31) has a height of 4.65 mm, a length of 9.7 mm, and a width of 0.2 mm.

2. The COF protection structure of the display module according to claim 1, characterized in that: The shape and size of the front side of the display module upper cover plate (11) are compatible with the shape and size of the front side of the display screen glass substrate (1), and the shape and size of the front side of the cover plate protective film (12) are the same as the shape and size of the front side of the display module upper cover plate (11).

3. The COF protection structure of the display module according to claim 1, characterized in that: A cover plate protective film tearing handle (121) is provided in the center of the right side of the front side of the cover plate protective film (12).

4. The COF protection structure of the display module according to claim 1, characterized in that: A first double-sided adhesive (21) is arranged on the left side of the back of the touch FPC (2), a protective film is attached to the back of the first double-sided adhesive (21), a first double-sided adhesive tearing handle (211) is arranged on the left side of the top of the protective film, and a PI reinforcing plate (22) is arranged on the back of the gold finger at the top right side of the front of the touch FPC (2).

5. The COF protection structure of the display module according to claim 1, characterized in that: A COF chip is arranged at the center of the front of the COF (3), and the COF (3) and the display screen glass substrate (1) are connected to each other via gold fingers, while the bottom of the COF (3) and the display FPC (4) are connected to each other via gold fingers.

6. The COF protection structure of the display module according to claim 1, characterized in that: The front side of the double-sided adhesive foam (31) is narrow at the top and wide at the bottom, with the upper part being an isosceles trapezoid and the lower part being a rectangle, and the double-sided adhesive foam (31) is attached to the center of the back of the COF (3) and corresponds to the COF chip.

7. The COF protection structure of the display module according to claim 1, characterized in that: A connector (41) is arranged on the left block at the bottom of the front side of the display FPC (4), and a second double-sided adhesive (42) is attached to the back of the connector (41).

8. The COF protection structure of the display module according to claim 7, characterized in that: The shape and size of the front side of the second double-sided adhesive (42) are the same as the shape and size of the front side of the block body at the bottom right side of the front side of the display FPC (4).

9. The COF protection structure of the display module according to claim 7, characterized in that: A steel sheet reinforcement (43) is provided at the back of the connector (41) on the front side of the display FPC (4).

10. The COF protection structure of the display module according to claim 7, characterized in that: A tear-off film is attached to the back of the second double-sided adhesive (42), and a tear-off handle is provided on the left side of the tear-off film.