CN112533366B

CN112533366B - Display module assembly and flexible circuit board

Info

Publication number: CN112533366B
Application number: CN202011340712.XA
Authority: CN
Inventors: 付相杰; 邓达希; 郑红
Original assignee: Guangzhou Guoxian Technology Co Ltd
Current assignee: Guangzhou Guoxian Technology Co Ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2022-05-27
Anticipated expiration: 2040-11-25
Also published as: CN112533366A

Abstract

The application discloses display module assembly and flexible circuit board, display module assembly includes: the screen body is provided with a first bonding area and a second bonding area which are mutually spaced; each first circuit board is provided with a first terminal group and a second terminal group, and the two first circuit boards are correspondingly connected to the first bonding area and the second bonding area one by one through the first terminal groups; the first circuit board is a flexible circuit board, and at least one of the first circuit board has terminals of the first terminal group and terminals of the second terminal group, which extend in at least partial directions intersecting each other. By the mode, the bonding yield can be improved.

Description

Display module assembly and flexible circuit board

Technical Field

The application belongs to the technical field of show, concretely relates to display module assembly and flexible circuit board.

Background

Because the display area of the screen body in the display module assembly constantly increases, the number of pixels needing to be driven is greatly increased, and the area needing to be bound by the screen body is increased to two binding areas from a single binding area. Corresponding bonding structure as shown in fig. 1, the corresponding bonding process may be: step A: bonding the two

flip chips

20 and 20a with two bonding areas on the screen body 22 respectively; and B: the

flip chips

20 and 20a are bonded to the same flexible circuit board 24.

In the bonding process of step a, the two

flip chips

20 and 20a may be shifted in opposite directions (expanded or contracted) due to material expansion and contraction, so that the flexible circuit board 24 cannot be aligned with the two

flip chips

20 and 20a at the same time, and the bonding yield is affected.

Disclosure of Invention

The application provides a display module assembly and flexible circuit board to improve bonding yield.

In order to solve the technical problem, the application adopts a technical scheme that: provide a display module assembly, include: the screen body is provided with a first bonding area and a second bonding area which are mutually spaced; each first circuit board is provided with a first terminal group and a second terminal group, and the two first circuit boards are correspondingly connected to the first bonding area and the second bonding area one by one through the first terminal groups; the first circuit board is a flexible circuit board, and at least one of the first circuit board has terminals of the first terminal group and terminals of the second terminal group, which extend in at least partial directions intersecting each other.

And at least one first terminal group and at least one second terminal group in the first circuit board are arranged in the same direction, wherein at least partial extending directions of the terminals of the first terminal group and the terminals of the second terminal group in the first circuit board are mutually perpendicular.

Wherein, the display module assembly still includes: and the second circuit board is provided with a third terminal group and a fourth terminal group, at least partial extending directions of terminals of the third terminal group and terminals of the fourth terminal group are mutually vertical, and the terminals are connected to the second terminal groups of the two first circuit boards in a one-to-one correspondence manner.

Wherein, the display module assembly still includes: at least one driving chip arranged on the first circuit board and connected between the first terminal group and the second terminal group; the first bonding area and the second bonding area are located on a first side of the screen body, and the two first circuit boards and the second circuit board are located on the first side.

The second circuit board comprises a first side edge and a second side edge which are perpendicular to each other, and the first side edge is close to the first side; the third terminal group is positioned on the first side edge, and the extending direction of the terminal of the third terminal group close to the first side edge is vertical to the first side edge; the fourth terminal group is located on the second side edge, and the extending direction of the fourth terminal group close to the terminal on the second side edge is perpendicular to the second side edge.

Wherein a width of the second circuit board at the third terminal group position is smaller than a width of the second circuit board at the fourth terminal group position in a direction perpendicular to the first side edge.

The third terminal group and the fourth terminal group are located on the same side of the second circuit board close to the first side, the terminal ends of the third terminal group are parallel to the first side, the rest parts of the terminal ends are perpendicular to the first side, and the terminal extending direction of the fourth terminal group is perpendicular to the first side.

At least one extending area extending towards the first side direction is arranged on the same side, close to the first side, of the second circuit board, and the tail end of the third terminal group and the tail end of the fourth terminal group are located in the extending areas; preferably, the second circuit board is provided with two extending regions extending towards the first side on the same side close to the first side, and the ends of the third terminal group and the fourth terminal group are respectively located in the two extending regions.

Wherein the second terminal sets of the two first circuit boards are connected with each other; preferably, one of the first circuit boards includes a fifth terminal set, a part of the terminals of the fifth terminal set are connected to the first terminal set of the same first circuit board, and the remaining part of the terminals of the fifth terminal set are connected to the second terminal set of the same first circuit board.

In order to solve the above technical problem, another technical solution adopted by the present application is: provided is a flexible circuit board including: the terminal comprises a first terminal group and a second terminal group, wherein at least partial extending directions of terminals of the first terminal group and the second terminal group are mutually crossed; the flexible circuit board is used for matching with another flexible circuit board to be connected to two bonding areas of the same device one by one; preferably, the first terminal set and the second terminal set are located at signal input ends of the flexible circuit board.

Being different from the prior art situation, the beneficial effect of this application is: the display module comprises a screen body and two first circuit boards; the screen body is provided with first bonding district and the second bonding district of mutual interval, and each first circuit board all is provided with first terminal group and second terminal group, and two first circuit boards are connected to first bonding district and second bonding district through first terminal group one-to-one. The extending directions of at least parts of the terminals of the first terminal group and the second terminal group in at least one first circuit board are mutually crossed. In the bonding process, if the offset directions of the two first circuit boards are not consistent, because at least part of the extending directions of the first terminal group and the second terminal group on the same first circuit board are mutually crossed, the offset of the two first circuit boards can be decomposed to the extending directions of the first terminal group and the second terminal group, and offset compensation can be respectively carried out from the extending directions of the second terminal group and the first terminal group, so that the bonding yield is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic diagram of a display module according to an embodiment of the prior art;

FIG. 2 is a schematic structural diagram of an embodiment of a display module according to the present application;

FIG. 3 is a schematic diagram of an embodiment of the screen of FIG. 2;

FIG. 4 is a schematic diagram of an embodiment of a second circuit board shown in FIG. 2;

FIG. 5 is a schematic structural diagram of another embodiment of a display module of the present application;

FIG. 6 is a schematic diagram of a structure of one embodiment of the second circuit board of FIG. 5;

FIG. 7 is a schematic structural diagram of another embodiment of a display module of the present application;

fig. 8 is a schematic structural diagram of another embodiment of a display module according to the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of a display module of the present application, and fig. 3 is a schematic structural diagram of an embodiment of a panel body in fig. 2, where the display module includes a panel body 10 and two

first circuit boards

12 and 12 a.

Specifically, the screen 10 may be a flexible screen or a rigid screen, and the light emitting form thereof may be an OLED or the like. The non-display area of the screen body 10 is provided with a first bonding area 100 and a second bonding area 102 (shown in fig. 3) spaced apart from each other, and the first bonding area 100 and the second bonding area 102 may be on the same side or adjacent sides or opposite sides of the screen body 10. A plurality of input pads 1000 may be disposed in the first bonding region 100 and the second bonding region 102, respectively, and a plurality of pixel driving circuits in the screen body 10 may be in one-to-one correspondence with and electrically connected to the plurality of input pads 1000. Due to the limitation of the space, the plurality of input pads 1000 may extend in a direction perpendicular to the side of the screen body 10 adjacent thereto. The two

first circuit boards

12 and 12a may be flexible circuit boards, each first circuit board 12/12a has a first terminal set 120/120a and a second terminal set 122/122a, the two

first circuit boards

12 and 12a are connected to the first bonding area 100 and the second bonding area 102 through the first terminal sets 120 and 120a in a one-to-one correspondence, the first terminal set 120/120a may be regarded as a signal output terminal of the first circuit board 12/12a, and correspondingly, the second terminal set 122/122a may be regarded as a signal input terminal of the first circuit board 12/12 a. The terminals in the first terminal group 120/120a or the terminals in the second terminal group 122/122a may extend in a straight line direction or a broken line direction, and may be determined according to the circuit layout on the

first circuit board

12 or 12 a. The terminals of the first terminal set 120 and the terminals of the second terminal set 122 in at least one first circuit board 12 at least partially extend in a direction intersecting each other, and the extending directions of all the terminals are in a plane parallel to the panel 10 or substantially parallel to the panel 10.

In the bonding process, if the offset directions of the two

first circuit boards

12 and 12a are not the same, because at least some of the extending directions of the terminals of the first terminal group 120 and the terminals of the second terminal group 122 on the same first circuit board 12 (as indicated in fig. 2) are arranged to intersect with each other, the offset amounts of the two

first circuit boards

12 and 12a can be decomposed into the extending directions of the terminals of the first terminal group 120 and the second terminal group 122, and offset compensation can be performed from the extending direction of the terminals of the second terminal group 122 and the extending direction of the terminals of the first terminal group 120, respectively, so as to improve the bonding yield.

In the present embodiment, at least a portion of the extending directions of the terminals of the first terminal set 120 and the terminals of the second terminal set 122 in at least one first circuit board 12 (as indicated in fig. 2) are perpendicular to each other. In general, when a material undergoes expansion and deflection in a bonding process, the deflection amount can be decomposed into a horizontal direction and a vertical direction; when the bonding offset is found, the offset value in the horizontal direction can be compensated along the horizontal direction, and then the offset value in the vertical direction can be compensated along the vertical direction, so that the alignment process is simpler. Of course, in other embodiments, the offset value in the vertical direction may be compensated in the vertical direction first, and then the offset value in the horizontal direction may be compensated in the horizontal direction.

Further, referring to fig. 1, at least a portion of the extending directions of the second terminal sets 122 and 122a of the two

first circuit boards

12 and 12a in the display module provided by the present application are perpendicular to each other, please refer to fig. 4, and fig. 4 is a schematic structural diagram of an embodiment of the second circuit board in fig. 2. The display module further includes a second circuit board 14, the second circuit board 14 is provided with a third terminal group 140 and a fourth terminal group 142, at least some of the extending directions of the terminals of the third terminal group 140 and the terminals of the fourth terminal group 142 are perpendicular to each other, and the terminals are connected to the second terminal groups 122 and 122a of the two

first circuit boards

12 and 12a in a one-to-one correspondence manner. In this embodiment, the third terminal group 140 and the fourth terminal group 142 can be regarded as being located on the signal output terminal of the second circuit board 14; the second circuit board 14 may further include a fifth terminal group (not shown) on the signal input end, and the terminals in the fifth terminal group may be electrically connected to the terminals in the third terminal group 140 and the fourth terminal group 142, respectively. The second circuit board 14 may be a flexible circuit board, and subsequently, the two

first circuit boards

12 and 12a may be electrically connected to the system motherboard through the same second circuit board 14, so that the driving signals of the display module are relatively synchronous. Of course, in other embodiments, the second circuit board 14 may also be a PCB board directly.

In addition, referring to fig. 1 again, the extending direction of the first terminal sets 120 and 120a of the two

first circuit boards

12 and 12a may not be limited too much in the present embodiment; for example, the extending directions of the two first terminal sets 120 and 120a may be parallel to each other, and the extending direction of the second terminal set 122 of the first circuit board 12 is perpendicular to the extending direction of the first terminal set 120, and the extending direction of the second terminal set 122a of the first circuit board 12a is parallel to the extending direction of the first terminal set 120 a.

The specific bonding process for the two

first circuit boards

12 and 12a and the second circuit board 14 in fig. 2 may be: A. aligning and bonding the first terminal sets 120 and 120a of the two

first circuit boards

12 and 12a with the first bonding region 100 and the second bonding region 102 of the screen body 10, respectively; B. aligning the second circuit board 14 with the two second terminal sets 120 and 120a, the specific process may be: first, in the X direction, the second circuit board 14 in fig. 2 is aligned with the first circuit board 12a with the reference number 12 a; the second circuit board 14 in fig. 2 is then aligned with the first circuit board 12, referenced 12, in the Y direction. Since the second terminal group 122a of the first circuit board 12a, which is denoted by reference numeral 12a, includes a portion extending in the Y direction, it is ensured that the second circuit board 14 and the second terminal group 122a, which is denoted by reference numeral 12a, can have portions overlapping each other even if the second circuit board 14 moves in the Y direction. Or: first, in the Y direction, the second circuit board 14 in fig. 2 is aligned with the first circuit board 12 with reference numeral 12; the second circuit board 14 in fig. 2 is then aligned with the first circuit board 12a, referenced 12a, in the X direction. Since the second terminal group 122 of the first circuit board 12 denoted by reference numeral 12 includes a portion extending in the X direction, it is ensured that the second circuit board 14 can have a portion overlapping with the second terminal group 122 denoted by reference numeral 122 even if the second circuit board 14 moves in the X direction. C. The second circuit board 14 is bonded to the two second terminal sets 120 and 120a, and may be bonded by ACF, solder, or the like.

In this embodiment, the two

first circuit boards

12 and 12a may be chip on films, and the display module further includes at least one driving chip 16 disposed on the first circuit board 12/12a and connected between the first terminal set 120/120a and the second terminal set 122/122 a; and first bonding area 100 and second bonding area 102 may be located on first side 104 of body 10, and two first circuit boards 120 and 120a and second circuit board 14 may be located on first side 104. The design mode is beneficial to improving the lightness and the thinness of the display module.

In one embodiment, as shown in fig. 2, the second circuit board 14 includes a first side 144 and a second side 146 that are perpendicular to each other, with the first side 144 facing the first side 104; the third terminal group 140 is located on the first side 144, and the extending direction of the terminal of the third terminal group 140 close to the first side 144 is perpendicular to the first side 144; the fourth terminal set 142 is located at the second side edge 146, and the extending direction of the terminals of the fourth terminal set 142 close to the second side edge 146 is perpendicular to the second side edge 146. The design mode can make the shape of the second circuit board 14 simpler and is easy to obtain by process preparation. Additionally, one end of the third terminal set 140 may also be disposed flush with the first side edge 144, and one end of the fourth terminal set 144 may be disposed flush with the second side edge 146.

In addition, the width d1 of the second circuit board 14 at the location of the third terminal group 140 is smaller than the width d2 of the second circuit board 14 at the location of the fourth terminal group 142 in a direction perpendicular to the first side 144 (i.e., the direction labeled Y in fig. 2). This design can reduce the substrate area of second circuit board 14, reduces the harmomegathus deformation volume of second circuit board 14 when bonding, and then reduces the degree of difficulty of subsequent counterpoint when bonding second circuit board 14 and system mainboard etc.. Preferably, the second circuit board 14 is L-shaped in a direction parallel to the first side 144.

In another embodiment, as shown in fig. 5, fig. 5 is a schematic structural diagram of another embodiment of the display module of the present application. In the display module, the third terminal group 140a and the fourth terminal group 142a of the second circuit board 14a are located on the same side of the second circuit board 14a facing the first side 104, the terminal ends of the third terminal group 140a are parallel to the first side 104, the rest are perpendicular to the first side 104, and the terminal extending direction of the fourth terminal group 142a is perpendicular to the first side 104. The terminal in the third terminal group 140a corresponds to an L-shape and the terminal in the fourth terminal group 142a corresponds to an I-shape in the above design, which can facilitate the wiring in the second circuit board 14 a.

Correspondingly, for second terminal set 122b to be bonded to third terminal set 140a, the end of second terminal set 122b is parallel to first side 104, and the end of second terminal set 122b and the end of third terminal set 140a are bonded to each other; while the remaining portion of the second terminal set 122b is perpendicular to the first side 104. For the second terminal set 122c to be bonded with the fourth terminal set 140a, the extending direction of the terminals of the second terminal set 122c is perpendicular to the first side 104. This design may facilitate wiring in the first circuit board 12 b.

Optionally, referring to fig. 5 and fig. 6 together, fig. 6 is a schematic structural diagram of an embodiment of the second circuit board in fig. 5. The side of the second circuit board 14a facing the panel 10 is provided with two

extension regions

148 and 148a extending towards the first side 104, and the ends of the third terminal group 140a (i.e. the portion of the third terminal group 140a parallel to the first side 104) and the fourth terminal group 142a are located in the two

extension regions

148 and 148a, respectively. The design method can reduce the area of the base material of the second circuit board 14a, reduce the expansion and contraction deformation of the second circuit board 14a during bonding, and further reduce the difficulty of subsequent bonding alignment of the second circuit board 14a and a system mainboard and the like. Of course, in other embodiments, the side of the second circuit board 14a facing the panel 10 may also be provided with an extension region extending toward the first side 104, and in this case, the end of the third terminal group 140a (i.e., the portion of the third terminal group 140a parallel to the first side 104) and the end of the fourth terminal group 142a may be located in the extension region.

Further, with reference to fig. 5 and fig. 6, the extension area 148 where the end of the third terminal group 140a is located is rectangular, and the area of the first circuit board 12b covered by the extension area 148 can also be rectangular. Alternatively, please refer to fig. 7, fig. 7 is a schematic structural diagram of another embodiment of the display module of the present application. The extension 148b where the end of the third terminal group 140b is located may include a hypotenuse, in which case the end of the third terminal group 140b may be aligned with the hypotenuse. This design may further reduce the substrate area of the second circuit board 14b to reduce the amount of expansion deformation of the second circuit board 14b during bonding.

In the embodiments shown in fig. 2, fig. 5 and fig. 7, the first bonding area and the second bonding area of the screen body are respectively connected to a flexible circuit board after passing through a flip chip. In other embodiments, the first bonding area and the second bonding area of the screen body may also be respectively connected to a flexible circuit board, specifically referring to fig. 8, and fig. 8 is a schematic structural diagram of another embodiment of a display module according to the present application. The terminal extension directions of the first terminal set 120d (or 120e) and the second terminal set 122d (or 122e) of each first circuit board 12d (or 12e) are perpendicular to each other, for example, the terminal extension directions of the

first terminal set

120d and 120e are perpendicular to the first side 104 of the panel 10, and the terminal extension directions of the

second terminal set

122d and 122e are parallel to the first side 104. The second terminal sets 122d and 122e of the two

first circuit boards

12d and 12e are bonded to each other.

In addition, one of the first circuit boards 12e further includes a fifth terminal set 124, a part of the terminals of the fifth terminal set 124 is connected to the first terminal set 120e of the same first circuit board 12e, and the remaining part of the terminals of the fifth terminal set 124 is connected to the second terminal set 122e of the same first circuit board 12 e. That is, the two

first circuit boards

12d and 12e can receive signals from the same position, so that the driving signals of the screen body 10 are relatively synchronous; the two

first circuit boards

12d and 12e can be designed in a manner of reducing the area of the circuit boards, so as to reduce the amount of expansion and contraction deformation during bonding connection. In this embodiment, the first terminal set 120e and the second terminal set 122e of the first circuit board 12e with reference number 12e can be regarded as being on the signal output terminals thereof, and the fifth terminal set 124 can be regarded as being on the signal input terminals thereof; the first terminal set 120d of the first circuit board 12d, labeled 12d, can be considered to be on its signal output terminal and the second terminal set 122d can be considered to be on its signal input terminal.

And to the circuit board of some structure types mentioned in above-mentioned display module assembly, this application also can sell, circulate alone. The circuit board may be a flexible circuit board FPC or the like, which includes a first terminal set and a second terminal set, and at least partial extending directions of terminals of the first terminal set and the second terminal set intersect with each other, and the flexible circuit board is used for being connected to two bonding areas of the same device (for example, a screen body or the like) one by one in cooperation with another flexible circuit board. Preferably, at least part of the extending directions of the terminals of the first terminal set and the second terminal set are perpendicular to each other. In addition, the first terminal set and the second terminal set may be both located at a signal input terminal of the flexible circuit board. The specific related structure of the flexible circuit board can be referred to the second circuit board with

reference number

14, 14a or 14b or the first circuit board with reference number 12e in the above embodiments, and is not described herein again.

The above description is only an example of the present application, and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes performed by the present application and the contents of the attached drawings, which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A display module, comprising:

the screen body is provided with a first bonding area and a second bonding area which are mutually spaced; the first bonding area and the second bonding area are positioned on a first side of the screen body;

each first circuit board is provided with a first terminal group and a second terminal group, and the two first circuit boards are correspondingly connected to the first bonding area and the second bonding area one by one through the first terminal groups; the first circuit board is a flexible circuit board, and at least one terminal of the first terminal group and at least part of the extending directions of the terminals of the second terminal group in the first circuit board are crossed; at least part of the extending directions of the terminals of the second terminal group of the two first circuit boards are mutually vertical;

the second circuit board is provided with a third terminal group and a fourth terminal group, at least partial extending directions of terminals of the third terminal group and terminals of the fourth terminal group are mutually vertical, and the terminals are connected to the second terminal groups of the two first circuit boards in a one-to-one correspondence manner; wherein the two first circuit boards and the second circuit board are connected to the first side.

2. The display module of claim 1,

at least one of the first terminal group and the second terminal group of the first circuit board has terminals extending in directions perpendicular to each other.

3. The display module of claim 1, further comprising:

and the driving chip is arranged on the first circuit board and connected between the first terminal group and the second terminal group.

4. The display module of claim 1,

the second circuit board comprises a first side edge and a second side edge which are perpendicular to each other, and the first side edge is close to the first side;

the third terminal group is positioned on the first side edge, and the extending direction of the terminal of the third terminal group close to the first side edge is vertical to the first side edge; the fourth terminal group is located on the second side edge, and the extending direction of the fourth terminal group close to the terminal on the second side edge is perpendicular to the second side edge.

5. The display module of claim 4,

the width of the second circuit board at the position of the third terminal group is smaller than the width of the second circuit board at the position of the fourth terminal group in a direction perpendicular to the first side edge.

6. The display module of claim 1,

7. The display module of claim 6,

and the same side of the second circuit board close to the first side is provided with at least one extension area extending towards the direction of the first side, and the tail end of the third terminal group and the tail end of the fourth terminal group are positioned in the extension areas.

8. The display module of claim 7,

two extension regions extending towards the direction of the first side are arranged on the same side, close to the first side, of the second circuit board, and the tail ends of the third terminal group and the fourth terminal group are located in the two extension regions respectively.

9. The display module of claim 1,

the second terminal sets of the two first circuit boards are connected with each other.

10. The display module of claim 9,

the first circuit board comprises a fifth terminal group, a part of terminals of the fifth terminal group are connected with the first terminal group of the same first circuit board, and the rest of terminals of the fifth terminal group are connected with the second terminal group of the same first circuit board.

11. A flexible circuit board, comprising:

the terminal comprises a first terminal group and a second terminal group, wherein at least partial extending directions of terminals of the first terminal group and the second terminal group are mutually crossed;

the flexible circuit board is used for being matched with another flexible circuit board to be connected to two bonding areas on one side of the same device one by one, namely a first bonding area and a second bonding area on the first side of the connecting screen body;

wherein the other flexible circuit board comprises a first terminal set and a second terminal set; the flexible circuit board and the other flexible circuit board are connected to the first bonding area and the second bonding area in a one-to-one correspondence mode through the first terminal group, and at least partial extending directions of terminals of the second terminal group of the flexible circuit board and the other flexible circuit board are perpendicular to each other; the flexible circuit board and the second terminal group of the other flexible circuit board are used for being connected to a third terminal group and a fourth terminal group of a second circuit board in a one-to-one correspondence mode, and at least part of extending directions of terminals of the third terminal group and terminals of the fourth terminal group are perpendicular to each other.