LCM capable of preventing water vapor corrosion at welding position of FPC and PCB

Abstract

The embodiment of the utility model relates to the technical field of liquid crystal display modules, in particular to an LCM (Liquid Crystal Display Module) capable of preventing water vapor corrosion at the welding position of an FPC (Flexible Printed Circuit) and a PCB (Printed Circuit Board), which comprises a PCB main body, a backlight FPC, an LCD FPC and an LCM FPC are welded on the PCB main body, and sealant is arranged at the welding position of the backlight FPC, the LCD FPC and the LCM FPC with the PCB main body. And the sealant is used for isolating corrosion of external water vapor to welding positions of the backlight FPC, the LCD FPC and the LCM FPC with the PCB main body. According to the application, the sealant is arranged at the welding positions of the backlight FPC, the LCD FPC and the LCM FPC with the PCB main body, so that sealing of the welding positions of the backlight FPC, the LCD FPC and the LCM FPC with the PCB main body can be realized, the welding positions of the backlight FPC, the LCD FPC and the LCM FPC with the PCB main body can be further isolated from external water vapor, and when the LCM is placed in a high-temperature and high-humidity environment, the liquid crystal display panel can not be damaged. The water vapor is not easy to enter the welding area of the FPC and the PCB to cause the corrosion phenomenon of the welding position, so that the problem that the function of the LCM is damaged is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid crystal display modules, and more specifically to an LCM capable of preventing water vapor corrosion at a welding point between an FPC and a PCB. Background Art

[0002] LCM stands for Liquid Crystal Display Module, which is mainly composed of LCD, backlight, PCB and various FPCs. The FPC is welded on the PCB. Since the welding point between the FPC and the PCB is exposed metal, yellow protective paper is usually attached to the surface to prevent the welding area from short-circuiting with the metal during power-on, causing damage to the LCM.

[0003] For example, a Chinese patent (publication number: CN206147235U) discloses a display module, including a display panel, a backlight source and an FPC, wherein the FPC includes an LCM interface area, an LCM routing area and an LCD gold finger area, wherein the LCD gold finger area is connected to the display panel, and the FPC adopts a bifurcated design near the LCD gold finger area to extend a backlight routing area and a backlight pad area, wherein the backlight routing area is bent to connect the backlight pad area to the back of the backlight source, and further, the backlight routing area adopts an L-shaped design. Furthermore, the L-shaped turning part of the backlight routing area is adhered to the back of the backlight source by double-sided tape. Furthermore, a protective paper is also adhered to the backlight pad area. In specific practice, the inventors found the following defects:

[0004] Since the yellow protective paper has poor sealing properties with the PCB and FPC, when the LCM is placed in a high temperature and high humidity environment, water vapor can easily enter the FPC and PCB welding area, causing corrosion at the welding position, resulting in damage to the LCM function and failure to work properly. Therefore, we have made improvements to this and proposed an LCM that prevents water vapor corrosion at the welding point between the FPC and PCB. Utility Model Content

[0005] The technical problem to be solved by the embodiments of the present utility model is that the sealing performance between the yellow protective paper and the PCB and FPC is poor. When the LCM is placed in a high temperature and high humidity environment, water vapor can easily enter the welding area of ​​the FPC and PCB, causing corrosion at the welding position and damaging the function of the LCM.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A LCM for preventing water vapor corrosion at the welding point between an FPC and a PCB, comprising: a PCB board body, on which a backlight FPC, an LCD FPC and an LCM FPC are welded, and sealants are arranged at the welding points between the backlight FPC, the LCD FPC and the LCM FPC and the PCB board body, and the sealants are used to isolate the corrosion of the welding points between the backlight FPC, the LCD FPC and the LCM FPC and the PCB board body by external water vapor.

[0008] As an improvement of the utility model, a backlight module and an LCD structure connected to the backlight module are arranged on the front of the PCB board body, a through slot is opened on the PCB board body, and the backlight FPC and LCD FPC both pass through the through slot and are bent at the front of the PCB board body.

[0009] As an improved manner of the utility model, the backlight FPC and the LCD FPC are connected to the backlight module and the LCD structure respectively.

[0010] As an improved method of the utility model, the backlight module includes a backlight glue frame, and a double-sided adhesive tape is pasted on one side of the backlight glue frame close to the PCB board body, and the double-sided adhesive tape is connected to the PCB board body.

[0011] As an improved method of the utility model, a light guide plate and lamp beads located on one side of the light guide plate are arranged on the side of the backlight rubber frame away from the PCB board body, and the backlight FPC is connected to the lamp beads.

[0012] As an improved manner of the utility model, the lamp beads cooperate with the light guide plate to provide a light source for the LCD structure.

[0013] As an improved manner of the utility model, the LCD structure includes a lower polarizer connected to the light guide plate, and a side of the lower polarizer away from the light guide plate is connected to a lower glass.

[0014] As an improved manner of the utility model, the lower glass is connected to the LCD FPC, and a protective glue is provided at the connection between the lower glass and the LCD FPC.

[0015] As an improved manner of the utility model, a side of the lower glass away from the lower polarizer is further connected to a driver IC, and a protective adhesive is also provided between the driver IC and the lower glass.

[0016] As an improved manner of the utility model, the side of the lower glass away from the lower polarizer is connected to the upper glass, and the side of the upper glass away from the lower glass is connected to the upper polarizer.

[0017] Compared with the prior art, the embodiments of the present invention mainly have the following beneficial effects:

[0018] In order to solve the problem that the sealing performance of the yellow protective paper and the PCB and FPC in the prior art is poor, when the LCM is placed in a high temperature and high humidity environment, water vapor can easily enter the welding area of ​​the FPC and the PCB, causing corrosion at the welding position and damaging the LCM function. The present application provides a sealant at the welding positions of the backlight FPC, LCD FPC and LCM FPC and the PCB board body, thereby sealing the welding positions of the backlight FPC, LCD FPC and LCM FPC and the PCB board body, and further isolating the welding positions of the backlight FPC, LCD FPC and LCM FPC and the PCB board body from external water vapor, so that when the LCM is placed in a high temperature and high humidity environment, water vapor is not easy to enter the welding area of ​​the FPC and the PCB, causing corrosion at the welding position, thereby solving the problem of damaged LCM function. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of the LCM for preventing water vapor corrosion at the welding point between FPC and PCB provided in this application;

[0020] Figure 2 A schematic diagram of the rear view structure of the PCB board body of the LCM for preventing water vapor corrosion at the welding point between the FPC and the PCB provided in the present application;

[0021] Figure 3 The LCM for preventing water vapor corrosion at the welding point between FPC and PCB provided in this application Figure 2 A side view schematic diagram of the structure;

[0022] Figure 4 A schematic diagram of the structure of the backlight FPC and LCD FPC of the LCM for preventing water vapor corrosion at the welding point between the FPC and the PCB provided in this application;

[0023] Figure 5 A schematic diagram of the structure of the backlight module of the LCM for preventing water vapor corrosion at the welding point between the FPC and the PCB provided in the present application;

[0024] Figure 6 A schematic diagram of the LCD structure of an LCM for preventing water vapor corrosion at the welding point between FPC and PCB provided in the present application.

[0025] Indicated in the figure:

[0026] 1. PCB board body; 101. Through slot; 2. Backlight FPC; 3. LCD FPC; 4. LCM FPC; 5. Sealant; 6. LCD structure; 601. Upper polarizer; 602. Upper glass; 603. Lower glass; 604. Lower polarizer; 605. Driver IC; 606. Protective glue; 7. Backlight module; 701. Backlight glue frame; 702. Light guide plate; 703. Lamp beads; 704. Double-sided tape. DETAILED DESCRIPTION

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present invention belongs; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Reference to "embodiments" herein means that specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] As described in the background technology, since the yellow protective paper has poor sealing properties with the PCB and FPC, when the LCM is placed in a high temperature and high humidity environment, water vapor can easily enter the welding area of ​​the FPC and PCB, causing corrosion at the welding position, resulting in damage to the LCM function and inability to work normally.

[0029] In order to solve this technical problem, the utility model provides an LCM for preventing water vapor corrosion at the welding point between FPC and PCB.

[0030] Specifically, please refer to Figure 1 -picture Figure 4 , LCMs that prevent water vapor corrosion at the welding point between FPC and PCB include:

[0031] A PCB board body 1 is provided, on which a backlight FPC2, an LCD FPC3 and an LCM FPC4 are welded. Sealant 5 is provided at welding places between the backlight FPC2, the LCD FPC3 and the LCM FPC4 and the PCB board body 1. The sealant 5 is used to isolate the corrosion of the welding places between the backlight FPC2, the LCD FPC3 and the LCM FPC4 and the PCB board body 1 by external water vapor.

[0032] The utility model provides an LCM for preventing water vapor corrosion at the welding place between FPC and PCB. By setting a sealant 5 at the welding place between backlight FPC2, LCD FPC3 and LCM FPC4 and PCB board main body 1, the welding place between backlight FPC2, LCD FPC3 and LCM FPC4 and PCB board main body 1 can be sealed, thereby isolating the welding place between backlight FPC2, LCD FPC3 and LCM FPC4 and PCB board main body 1 from external water vapor, so that when the LCM is placed in a high temperature and high humidity environment, water vapor is not easy to enter the welding area between FPC and PCB to cause corrosion at the welding position, thereby solving the problem of damaged LCM function.

[0033] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] Embodiment 1 of the utility model for preventing water vapor corrosion at the welding point between FPC and PCB

[0037] Please refer to Figure 1-Figure 4 The utility model discloses an LCM for preventing water vapor corrosion at the welding place between FPC and PCB, comprising: a PCB board body 1, on which a backlight FPC2, an LCD FPC3 and an LCM FPC4 are welded, and a sealant 5 is arranged at the welding places between the backlight FPC2, LCD FPC3 and LCMFPC4 and the PCB board body 1, and the sealant 5 is used to isolate the corrosion of the welding places between the backlight FPC2, LCD FPC3 and LCM FPC4 and the PCB board body 1 by external water vapor. The utility model discloses an LCM for preventing water vapor corrosion at the welding places between the backlight FPC2, LCD FPC3 and LCM FPC4 and the PCB board body 1 by providing the sealant 5 at the welding places between the backlight FPC2, LCD FPC3 and LCMFPC4 and the PCB board body 1, so as to isolate the welding places between the backlight FPC2, LCD FPC3 and LCM FPC4 and the PCB board body 1 from external water vapor, so that when the LCM is placed in a high temperature and high humidity environment, water vapor is not easy to enter the welding area between the FPC and the PCB to cause corrosion at the welding position, thereby solving the problem of impaired LCM function.

[0038] Sealant 5 uses a light-curing adhesive. Light-curing adhesive is a special adhesive whose curing process is achieved by light irradiation. After being irradiated with ultraviolet light or visible light, the photoinitiator or photosensitizer in the light-curing adhesive will be activated, thereby initiating polymerization, cross-linking and grafting reactions, so that the adhesive quickly changes from a liquid state to a solid state, achieving the purposes of bonding, sealing and fixing. Light-curing adhesive has many advantages. First, it has a fast curing speed and is suitable for occasions requiring high-efficiency bonding. Second, the light-curing adhesive has a high bonding strength and can firmly bond different materials together to form a whole. In addition, the light-curing adhesive also has low volatility, does not produce volatile organic compounds, is environmentally friendly and safe to use.

[0039] The application of light-curing adhesives in waterproofing the connection between FPC and PCB has its unique advantages. First, the curing process of light-curing adhesives is achieved by light irradiation, and the curing speed is fast. It can form a stable bonding layer in a short time, thereby effectively preventing the intrusion of water and moisture; secondly, the bonding layer formed after the light-curing adhesive is cured usually has excellent sealing performance, which can ensure the sealing of the connection between FPC and PCB and prevent the penetration of water and moisture, which is crucial for electronic equipment, because the intrusion of water and moisture may cause corrosion of the circuit board and degradation of electrical performance; in addition, light-curing adhesives also have excellent weather resistance and chemical stability, and can maintain stable performance in various harsh environments, protecting the connection between FPC and PCB from water and moisture for a long time.

[0040] Further, such as Figure 1 , Figure 2 and Figure 4 As shown, a backlight module 7 and an LCD structure 6 connected to the backlight module 7 are arranged on the front of the PCB board body 1, a through slot 101 is opened on the PCB board body 1, the backlight FPC2 and the LCD FPC3 both pass through the through slot 101 and are bent at the front of the PCB board body 1, and the setting of the through slot 101 can meet the bending requirements of the backlight FPC2 and the LCD FPC3.

[0041] Further, such as Figure 1 , Figure 5 and Figure 6 As shown, the backlight FPC2 and the LCD FPC3 are connected to the backlight module 7 and the LCD structure 6 respectively. The backlight module 7 and the LCD structure 6 can be connected to the PCB board body 1 through the backlight FPC2 and the LCD FPC3, so that the backlight module 7 and the LCD structure 6 are electrically connected to the PCB board body 1.

[0042] Embodiment 2 of the utility model for preventing water vapor corrosion at the welding point between FPC and PCB

[0043] Further, such as Figure 5 As shown, the backlight module 7 includes a backlight glue frame 701, and a double-sided adhesive tape 704 is pasted on one side of the backlight glue frame 701 close to the PCB board body 1, and the double-sided adhesive tape 704 is connected to the PCB board body 1. The backlight glue frame 701 and the PCB board body 1 can be connected and fixed together through the double-sided adhesive tape 704.

[0044] Further, such as Figure 5 As shown, a light guide plate 702 and a lamp bead 703 located on one side of the light guide plate 702 are arranged on the side of the backlight plastic frame 701 away from the PCB board body 1, and the backlight FPC2 is connected to the lamp bead 703; the lamp bead 703 cooperates with the light guide plate 702 to provide a light source for the LCD structure 6; the backlight plastic frame 701, the light guide plate 702 and the lamp bead 703 cooperate with each other to provide uniform and stable backlight support for the LCD structure 6; firstly, the lamp bead 703 is a light-emitting element, and its main function is to emit light, and these lights are processed by the light guide plate 702 to form a uniform backlight, providing the required illumination for the LCD structure 6; secondly, the backlight plastic frame 701 plays the role of positioning, supporting and protecting, and the backlight plastic frame 701 is generally made of an environmentally friendly plastic. The material is injection molded, it can fix the LCD structure 6 and protect the LCD structure 6 from the influence of the external environment; finally, the light guide plate 702 is one of the key components, and its main function is to convert the point light source emitted by the lamp bead 703 into a surface light source, providing uniform and stable backlight support for the LCD structure 6. The light guide plate 702 can evenly disperse the light to the entire LCD structure 6, improve the brightness and uniformity of the LCD structure 6, and at the same time, the light guide plate 702 can also improve the utilization rate of light and reduce the waste of light energy; in summary, the backlight rubber frame 701, the light guide plate 702 and the lamp bead 703 each play an indispensable role, and together provide high-quality backlight support for the LCD structure 6, ensuring that users can enjoy clear and bright display effects.

[0045] Embodiment 3 of the LCM for preventing water vapor corrosion at the welding point between FPC and PCB according to the utility model

[0046] Further, such as Figure 6 As shown, the LCD structure 6 includes a lower polarizer 604 connected to the light guide plate 702. The side of the lower polarizer 604 away from the light guide plate 702 is connected to a lower glass 603. The lower glass 603 also provides mechanical support and protection for the backlight module 7. At the same time, its optical properties also contribute to the uniform distribution and transmission of light.

[0047] Further, such as Figure 6As shown, the lower glass 603 is connected to the LCD FPC3, and a protective glue 606 is provided at the connection between the lower glass 603 and the LCD FPC3. The protective glue 606 can also be made of a light-curing adhesive. The protective glue 606 provided at the connection between the lower glass 603 and the LCD FPC3 can improve the firmness of the connection between the LCD FPC3 and the lower glass 603.

[0048] Further, such as Figure 6 As shown, a driver IC 605 is also connected to the side of the lower glass 603 away from the lower polarizer 604, and a protective glue 606 is also arranged between the driver IC 605 and the lower glass 603. The driver IC 605 is mainly used to drive the lamp beads 703 and provide the required bias current. It can dynamically adjust the brightness of the lamp beads 703 as needed, control the PWM circuit, and realize external bias to increase or decrease the brightness. The protective glue 606 arranged between the driver IC 605 and the lower glass 603 can protect the driver IC 605.

[0049] Further, such as Figure 6 As shown, the side of the lower glass 603 away from the lower polarizer 604 is connected to the upper glass 602, and the side of the upper glass 602 away from the lower glass 603 is connected to the upper polarizer 601; the upper polarizer 601 is mainly used to analyze the polarized light after being electrically adjusted by the LCD structure 6. Through its processing, it can cause the contrast of the boundary line between light and dark to form an image. It is a key part of the LCD display panel. Without it, the LCD display panel will not be able to display the image correctly; the upper glass 602 usually has specific optical properties, such as high transmittance and high clarity, to protect the internal components and provide necessary mechanical support. In addition, it may also have anti-reflection, anti-scratch and other properties to improve the display effect and extend the service life.

[0050] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. An LCM for preventing water vapor corrosion at the welding point between FPC and PCB, characterized in that: include: A PCB board body (1), on which a backlight FPC (2), an LCD FPC (3) and an LCM FPC (4) are welded, and sealant (5) is provided at the welding points between the backlight FPC (2), the LCD FPC (3) and the LCM FPC (4) and the PCB board body (1), and the sealant (5) is used to isolate the corrosion of the welding points between the backlight FPC (2), the LCD FPC (3) and the LCM FPC (4) and the PCB board body (1) by external water vapor.

2. The LCM for preventing water vapor corrosion at the welding point between FPC and PCB according to claim 1, characterized in that: A backlight module (7) and an LCD structure (6) connected to the backlight module (7) are arranged on the front of the PCB board body (1); a through slot (101) is provided on the PCB board body (1); and both the backlight FPC (2) and the LCD FPC (3) pass through the through slot (101) and are bent at the front of the PCB board body (1).

3. The LCM for preventing water vapor corrosion at the welding point between FPC and PCB according to claim 2, characterized in that: The backlight FPC (2) and the LCD FPC (3) are connected to the backlight module (7) and the LCD structure (6) respectively.

4. The LCM for preventing water vapor corrosion at the welding point between FPC and PCB according to claim 3, characterized in that: The backlight module (7) comprises a backlight adhesive frame (701), and a double-sided adhesive tape (704) is adhered to a side of the backlight adhesive frame (701) close to the PCB board body (1), and the double-sided adhesive tape (704) is connected to the PCB board body (1).

5. The LCM for preventing water vapor corrosion at the welding point between FPC and PCB according to claim 4, characterized in that: A light guide plate (702) and a lamp bead (703) located on one side of the light guide plate (702) are provided on the side of the backlight rubber frame (701) away from the PCB board body (1), and the backlight FPC (2) is connected to the lamp bead (703).

6. The LCM for preventing water vapor corrosion at the welding point between FPC and PCB according to claim 5, characterized in that: The lamp beads (703) cooperate with the light guide plate (702) to provide a light source for the LCD structure (6).

7. The LCM for preventing water vapor corrosion at the welding point between FPC and PCB according to claim 6, characterized in that: The LCD structure (6) comprises a lower polarizer (604) connected to the light guide plate (702), and a side of the lower polarizer (604) away from the light guide plate (702) is connected to a lower glass (603).

8. The LCM for preventing water vapor corrosion at the welding point between FPC and PCB according to claim 7, characterized in that: The lower glass (603) is connected to the LCD FPC (3), and a protective glue (606) is provided at the connection between the lower glass (603) and the LCD FPC (3).

9. The LCM for preventing water vapor corrosion at the welding point between FPC and PCB according to claim 8, characterized in that: A driving IC (605) is also connected to the side of the lower glass (603) away from the lower polarizer (604), and a protective adhesive (606) is also provided between the driving IC (605) and the lower glass (603).

10. The LCM for preventing water vapor corrosion at the welding point between FPC and PCB according to claim 9, characterized in that: The side of the lower glass (603) away from the lower polarizer (604) is connected to the upper glass (602), and the side of the upper glass (602) away from the lower glass (603) is connected to the upper polarizer (601).

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