CN110012593A - A flexible circuit board and preparation method thereof, and liquid crystal display module - Google Patents

Abstract

The invention discloses a flexible circuit board, a preparation method thereof, and a liquid crystal display module. The bent main FPC (1) except for the bending region (4) is parallel to the plane on which the pads (2) are located, and The rest of the area is partially projected on the lower left corner of the pad (2) to form an overlapping area (5). The above structure is arranged so that the electrical signal of the main FPC (1) enters the pad (2) and then is electrically connected to the backlight FPC (3). The connection can prevent the pad (2) from being broken; the main FPC (1) is attached to one side of the plastic frame (7), and the backlight PFC (3) and the pad (2) are attached to the other side of the plastic frame (7). On one side, the main FPC (1), the backlight FPC (3), and the pad (2) occupy a small accommodation space as a whole; there is no need to make any structural improvements to the backlight FPC (3) and the pad (2). , and there is no need for additional investment in production costs such as technology, craftsmanship, and labor. In short, the present invention can effectively improve the performance of the liquid crystal display module in a low-cost manner.

Description

A flexible circuit board and preparation method thereof, and liquid crystal display module

technical field

The invention relates to the field of liquid crystal display, in particular to a flexible circuit board, a preparation method thereof, and a liquid crystal display module.

Background technique

Liquid crystal display modules are widely used in display devices due to their advantages of lightness, thinness, low energy consumption, and no radiation. The LCD module mainly includes a main flexible circuit board (main FPC), a backlight flexible circuit board (backlight FPC), a pad and a liquid crystal glass. The main FPC and the backlight FPC are electrically connected through the pad, and the backlight FPC provides backlight for the liquid crystal glass. light source. The main FPC is light in material, can be bent, and is pressed under the liquid crystal glass, which can effectively realize the arrangement of various electronic components and connection with external circuit boards, so as to realize the power supply and control of the liquid crystal glass, etc.

In the prior art, a main pad and a backlight pad are arranged at the connection between the main FPC and the backlight FPC, and the main FPC is electrically connected to the backlight FPC through the main pad and the backlight pad. The directions of the pads and the backlight pads are perpendicular, and the resulting bending stress is also perpendicular to the directions of the main pads and the backlight pads, which cause the main pads and the backlight pads to be easily broken under the action of bending stress, resulting in liquid crystal display. The quality of the module is low and the yield is low.

In view of the above-mentioned defects, the application No. 201320076055.1 named "a flexible circuit board structure for liquid crystal display module" provides an improved solution. For the bending of the main FPC, the "1"-shaped board on the backlight FPC is set as a folded board. , so that after the main FPC is bent, the pads set at the connection between the folded plate and the main FPC are parallel to the bending line, and the resulting bending stress is also parallel to the pads, thereby preventing the pads from being broken. The disadvantage of this technical solution is that the structure of the backlight FPC is adaptively improved, the backlight FPC with a special structure is used to make up for the defects of the prior art, the production cost is too large, and the improvement of the structure and performance of the liquid crystal display module is not promoted. effect.

SUMMARY OF THE INVENTION

The present invention provides a flexible circuit board and a liquid crystal display module, which can effectively improve the structural performance of the liquid crystal display module in a low-cost manner.

The present invention solves the technical problem through the following technical solutions:

A flexible circuit board includes a main FPC, a pad and a backlight FPC, the main FPC and the backlight FPC are electrically connected through the pad, and the backlight FPC is arranged on the upper right of the pad; when the main FPC is bent , a bending area is formed on the main FPC; except for the bending area of the main FPC after bending, the remaining areas are parallel to the plane where the pads are located, and the remaining areas are partially projected on the welding The lower left corner of the disk, forming the overlapping area.

Further, the bending area is provided with green oil.

The preparation method of the above flexible circuit board is:

The main FPC, the pad, and the backlight FPC are rotated 180° counterclockwise around the x-axis as a whole, and the main FPC is then rotated 180° counterclockwise around the y-axis with the connection between the main FPC and the pad as the reference line.

The liquid crystal display module including the above-mentioned flexible circuit board structure further includes a liquid crystal glass, a plastic frame and an iron frame; the liquid crystal glass is connected with the plastic frame in a snap-fit connection; the backlight FPC provides a backlight light source for the liquid crystal glass; The plastic frame is connected with the iron frame by clamping; the main FPC, the solder pad, the backlight FPC and the plastic frame are arranged in the accommodating space formed by the liquid crystal glass and the iron frame.

Further, the bonding pad is mounted on one side of the plastic frame, the main FPC is bent on the other side of the plastic frame, and the length of the bending area is the same as the thickness of the plastic frame.

Further, at the contact surface of the plastic frame and the bending area, the plastic frame is provided with a chamfer.

Further, the iron frame is provided with a folded edge.

Further, it also includes a reinforcing plate; the main FPC is provided with electronic components; the reinforcing plate and the electronic components are arranged on the same side of the main FPC; the reinforcing plate is annular, surrounding the electronic components.

Further, the reinforcing plate is square, and is composed of four reinforcing edges that are connected in sequence; rounded corners are provided at the joints of the four reinforcing edges.

Compared with the existing technology, it has the following characteristics:

The backlight FPC is arranged on the upper right of the pad, and the rest area of the bent main FPC except the bending area is parallel to the plane where the pad is located, and the remaining area is partially projected on the lower left of the pad The advantages of the above design are: (1) Only one pad is set, the main FPC after bending is parallel to the plane where the pad is located, and the electrical signal of the main FPC directly enters the pad, and then passes through The pad is electrically connected to the backlight FPC, so that the bending stress of the main FPC no longer acts on the electrical connection between the main FPC and the pad and the electrical connection between the backlight FPC and the pad, so as to avoid the pad being broken and affecting the LCD mode. (2) After the main FPC and the backlight FPC, the pads are rotated synchronously, and the main FPC is bent, the main FPC is attached to one side of the plastic frame, and the backlight PFC and the pads are attached to the other side of the plastic frame. On one side, the main FPC and other areas of the pad except the bending area are parallel to the pad, and there is an overlap area projected on the pad by the main FPC part, so that the main FPC, the backlight FPC, and the pad occupy the liquid crystal as a whole. The storage space of the display module is small, which makes the liquid crystal display module more compact; (3) there is no need to make any structural improvements to the backlight FPC and pads, no matter what the structure of the backlight FPC and pads are. It affects the performance of the main FPC and the overall performance of the liquid crystal display module, and does not require additional investment in production costs such as technology, craftsmanship, and labor. In short, the present invention does not need to change the structure of the pad and the backlight FPC, but only increases the rotation of the main FPC, the backlight FPC and the pad in the process and changes the bending method of the main FPC, so that the liquid crystal can be effectively improved in a low-cost way. Displays the performance of the module.

Description of drawings

FIG. 1 is a front view of a structural block diagram of a liquid crystal display module before the flexible circuit board is subjected to any processing.

FIG. 2 is a rear view of a structural block diagram of a liquid crystal display module obtained after the flexible circuit board is rotated.

3 is a front view of a structural block diagram of a liquid crystal display module obtained by bending the main FPC after the flexible circuit board is rotated.

The labels in the figure are: 1, main FPC; 2, pad; 3, backlight FPC; 4, bending area; 5, overlapping area; 6, liquid crystal glass; 7, plastic frame; 8, iron frame.

Detailed ways

The present invention will be further described below with reference to the examples, but the present invention is not limited to these examples.

A flexible circuit board, the same as the prior art, includes a main FPC 1, a pad 2 and a backlight FPC 3, wherein the main FPC 1 and the backlight FPC 3 are electrically connected through the pad 2, and the difference from the prior art is that , the backlight FPC 3 of the present invention is arranged on the upper right of the pad 2, when the main FPC 1 is bent, a bending area 4 is formed on the main FPC 1, and the bent main FPC 1 is divided into Outside the bending area 4 , the rest area is parallel to the plane where the pad 2 is located, and the rest area is partially projected on the lower left corner of the pad 2 to form an overlapping area 5 . The specific structure is shown in FIG. 3 . Since there is only one pad, and the bent main FPC 1 is parallel to the plane where the pad 2 is located, the electrical signals of the main FPC 1 can directly enter the pad 2, and then pass through the pad 2 and the backlight FPC 3. The electrical connection is realized, so that the bending stress of the main FPC 1 no longer acts on the electrical connection between the main FPC 1 and the pad 2 and the electrical connection between the backlight FPC 3 and the pad 2, so as to prevent the pad from being broken.

The purpose of setting green oil in the bending area 4 is to make the bending area 4 more flexible, reduce the generation of bending stress, and reduce the influence of the bending stress on the main FCP 1 and the pad 2 .

The preparation method of the above-mentioned flexible circuit board is as follows: the main FPC 1, the pad 2 and the backlight FPC 3 are rotated 180° counterclockwise around the x-axis as a whole, and the main FPC 1 is further divided by the distance between the main FPC 1 and the pad 2. The connection is the reference line, which is rotated 180° counterclockwise around the y-axis.

The front view of the structure block diagram of the liquid crystal display module before the flexible circuit board is not processed is shown in Figure 1. In Figure 1, the main FPC 1 and the pad 2 are integrally formed. On the same plane, the backlight FPC 3 is soldered on the solder. The upper right side of the front face of the disk 2, wherein the backlight FPC 3 is identified as KA in FIG. 1 . FIG. 2 is a rear view of the structural block diagram of the liquid crystal display module obtained after the flexible circuit board is rotated. The rotation process means that the main FPC 1, the pad 2 and the backlight FPC 3 are rotated 180° counterclockwise around the x-axis as a whole. , as can be seen from Figure 2, the pad 2 and the backlight FPC 3 are equivalent to turning up 180° counterclockwise with the x-axis as the reference line, while the main FPC 1 is equivalent to turning down 180° counterclockwise with the x-axis as the reference line . 3 is a front view of a structural block diagram of a liquid crystal display module obtained by bending the main FPC after the flexible circuit board is rotated in the present invention. The connection between them is the reference line, which is rotated 180° counterclockwise around the y-axis. It can be seen from Figure 3 that the main FPC 1 is equivalent to turning 180° counterclockwise with the y-axis as the reference line. Bend.

A liquid crystal display module, comprising the flexible circuit board of the above-mentioned structure, further comprising a liquid crystal glass 6, a plastic frame 7 and an iron frame 8; the liquid crystal glass 6 is connected with the plastic frame 7 in a snap-fit connection; the backlight FPC 3 is a The liquid crystal glass 6 provides a backlight light source; the plastic frame 7 is connected with the iron frame 8; 8 in the accommodating space formed. The bonding pad 2 is mounted on one side of the plastic frame 7 , the main FPC 1 is bent on the other side of the plastic frame 6 , and the length of the bending area 4 is the same as the thickness of the plastic frame 7 . same. After the main FPC 1 is synchronously rotated with the backlight FPC 3 and the pad 2 and the main FPC 1 is bent, the main FPC 1 is attached to one side of the plastic frame 7 , and the backlight PFC 3 and the pad 2 are attached to the plastic frame 7 On the other side, the main FPC 1 and the pad 2 are all parallel to the pad 2 except for the bending area 4, and there is an overlap area 5 when the main FPC 1 is projected on the pad 2, so that the main FPC 1, the backlight FPC 3. As a whole, the pad 2 occupies a smaller accommodating space of the liquid crystal display module, which makes the liquid crystal display module more compact in structure. Moreover, the liquid crystal display module provided by the present invention does not need to make any structural improvements to the backlight FPC 3 and the pads 2, and no matter what the structure of the backlight FPC 3 and the pads are in the prior art, they will not affect the main The performance of the FPC 1 and the overall performance of the liquid crystal display module do not require additional investment in production costs such as technology, process, and manpower.

Further, at the contact surface of the plastic frame 7 and the bending area 4, the plastic frame 7 is provided with a chamfer. The setting of the chamfer can effectively protect the main FPC 1 from the risk of cuts, and can also reduce the bending stress generated when the main FPC 1 is bent, further reducing the bending stress on the main FCP 1 and the pads. 2 effects.

Further, a hemming is provided on the iron frame 8 . The setting of the hemming is mainly to protect the iron frame 8 , avoid burrs in the punching process during the preparation process, and improve the quality of the iron frame 8 .

Since the main FPC 1 is provided with electronic components, in order to prevent the electronic components from falling off during the bending process of the main FPC 1, the present invention provides a reinforcing plate on the main FPC 1 for the area where the electronic components are located. The device is arranged on the same side of the main FPC 1, and the reinforcing plate is annular and surrounds the electronic component. The reinforcing plate can effectively support and limit the bending and deformation of the main body of the main FPC 1 in the area where the electronic components are located, and can effectively prevent the electronic components from falling off. Further, the reinforcing plate can also be set in a square shape, which is composed of four reinforcing edges connected in sequence, and rounded corners are provided at the joints of the four reinforcing edges. The setting of the rounded corners can be used for transitional connection, which can effectively avoid the formation of sharp points on the connection position of the reinforcing edge, which will cause damage to the main FPC 1, and can effectively improve the product quality.

Claims (9)

1. A flexible circuit board, comprising a main FPC (1), a pad (2) and a backlight FPC (3), the main FPC (1) and the backlight FPC (3) being electrically connected through the pad (2), the It is characterized by: The backlight FPC (3) is arranged on the upper right of the pad (2); when the main FPC (1) is bent, a bending area (4) is formed on the main FPC (1); Except for the bending area (4), the other areas of the bent main FPC (1) are parallel to the plane where the pads (2) are located, and the remaining areas are partially projected on the pads (2). In the lower left corner, an overlapping area (5) is formed. 2 . The flexible circuit board according to claim 1 , wherein the bending area ( 4 ) is provided with green oil. 3 . 3. A preparation method of a flexible circuit board, characterized in that: The main FPC (1), the pad (2), and the backlight FPC (3) are rotated 180° counterclockwise around the x-axis as a whole. The connection between them is the reference line, which is rotated 180° counterclockwise around the y-axis. 4. A liquid crystal display module comprising the flexible circuit board according to claim 1 or 2, wherein: It also includes a liquid crystal glass (6), a plastic frame (7) and an iron frame (8); the liquid crystal glass (6) is connected to the plastic frame (7) by engaging with it; the backlight FPC (3) is the liquid crystal The glass (6) provides a backlight light source; the plastic frame (7) is connected with the iron frame (8) in a snap-fit connection; the main FPC (1), the solder pad (2), the backlight FPC (3) and the plastic frame ( 7) Set in the accommodating space formed by the liquid crystal glass (6) and the iron frame (8). 5. A liquid crystal display module according to claim 4, wherein: The bonding pad (2) is mounted on one side of the plastic frame (7), the main FPC (1) is bent on the other side of the plastic frame (6), and the bending area ( The length of 4) is the same as the thickness of the plastic frame (7). 6. A liquid crystal display module according to claim 5, wherein: At the contact surface of the rubber frame (7) and the bending area (4), the rubber frame (7) is provided with a chamfer. 7 . The liquid crystal display module according to claim 4 , wherein the iron frame ( 8 ) is provided with a folded edge. 8 . 8. A liquid crystal display module according to claim 4, wherein: Also includes a reinforcing plate; electronic components are arranged on the main FPC (1); the reinforcing plate and the electronic components are arranged on the same side of the main FPC (1); the reinforcing plate is A ring shape surrounds the electronic components. 9. A liquid crystal display module according to claim 8, wherein: The reinforcing plate is square, and is composed of four reinforcing edges that are connected in sequence; rounded corners are provided at the joints of the four reinforcing edges.