CN219140702U

CN219140702U - Back plate structure combining FPC and PCB and backlight module

Info

Publication number: CN219140702U
Application number: CN202320057739.0U
Authority: CN
Inventors: 蒋小明; 林贞荣; 林庚申; 阮金峰
Original assignee: Huizhou Longxiangxing Technology Co ltd
Current assignee: Huizhou Longxiangxing Technology Co ltd
Priority date: 2023-01-09
Filing date: 2023-01-09
Publication date: 2023-06-06
Anticipated expiration: 2033-01-09

Abstract

The utility model relates to a backboard structure combined by FPC and PCB and a backlight module, wherein the backboard structure combined by FPC and PCB comprises a backboard, the backboard is provided with a mounting position, the mounting position is divided into a rigid area and a flexible area, the rigid area is provided with the PCB, the flexible area is provided with the FPC, the PCB is positioned in the middle of the backboard, and the FPC and the PCB are connected in a pressing way and extend to the edge of the backboard, so that the circuit board of the backboard has the flexibility advantage of a soft board and the support advantage of the rigid board. The utility model provides a backboard structure with a simple and stable structure and light weight, wherein the backboard structure is formed by combining an FPC (flexible printed circuit) and a PCB (printed circuit board) and a backlight module.

Description

Back plate structure combining FPC and PCB and backlight module

Technical Field

The utility model relates to the technical field of backlight modules, in particular to a back plate structure combining FPC and PCB and a backlight module.

Background

The existing backlight module is provided with an FPC (flexible printed Circuit) or a PCB (printed Circuit Board) on a back plate to be connected with an external circuit, and the single FPC is easy to deform and deviate when being connected, so that the structure is not stable enough, and the connection with the external circuit is inconvenient; the PCB has the advantages of stable structure, but the PCB has the defects of heavier weight, thicker thickness, poor heat dissipation effect and the like, and does not meet the requirements of light weight, thinness and good heat dissipation effect pursued by the existing backlight module, and the PCB is singly used as a circuit board of the backlight module, so that the occupied space is large and wiring is not good.

Disclosure of Invention

The utility model aims to provide a backboard structure and a backlight module with a simple and stable structure and light weight, wherein the backboard structure is formed by combining an FPC (flexible printed circuit) and a PCB (printed circuit board).

The utility model provides a backplate structure that FPC and PCB combine, includes the backplate, be equipped with the installation position on the backplate, the installation position divide into rigid region and flexible region, PCB is installed in the rigid region, FPC is installed in flexible region, PCB is located backplate intermediate position, FPC with PCB pressfitting is connected and extends to the backplate edge.

In the scheme, the L-shaped mounting position is arranged on the backboard, the PCB is mounted in the middle of the backboard, the FPC is connected with the PCB and extends towards the edge of the backboard, the PCB mounting area is a rigid area, and the FPC mounting area is a flexible area, so that the circuit board of the backboard has the advantages of flexibility of a soft board and supporting of the rigid board, the structure is stable, and wiring and connectors are greatly reduced due to the combination of the PCB and the FPC.

Further, the PCB is connected with the FPC to form a soft and hard combination board, the installation position is L-shaped, and the soft and hard combination board is tightly attached to the installation position.

In the scheme, the PP and the copper foil are pressed together outside by pressing the inner layer manufactured board in a hot-pressing and cold-pressing mode, so that a new inner layer is formed, the PCB and the FPC are connected in a pressing mode to form the soft and hard combined board, the soft and hard combined board has the characteristics of the FPC and the PCB, the soft and hard combined board can change shape according to a specific contour, the inner space of the backboard can be saved, the volume of the backlight module is reduced, the stability of the rigid board and the flexibility of the flexible board form a stable structure, and the reliability of the backlight module is improved.

Further, a support plate is arranged in the flexible area of the mounting position, and the FPC is adhered to the support plate.

In the scheme, the FPC is a flexible circuit board, the FPC is adhered to the supporting plate, the whole structure can be more stable, the FPC has higher assembly reliability, the assembly workload can be greatly reduced, and the performance of a circuit is easy to ensure.

Further, the FPC comprises a flexible insulating film and a conductor substrate bonded with the flexible insulating film, a first circuit pattern layer is arranged on the conductor substrate, and an interface connected with the outside is arranged at one end, far away from the PCB, of the FPC.

In the scheme, one end of the FPC is connected with the PCB in a pressing way, the other end of the FPC is provided with the interface, the FPC is connected with an external circuit through the interface, the FPC can be arranged randomly according to the space layout requirement, the size and the weight of the backlight module are reduced, the backlight module has good heat dissipation, and the backlight module is easy to assemble and connect.

Further, the PCB is a rigid circuit board, a second circuit layer is arranged on the PCB, and the first circuit layer is connected with the second circuit layer.

In the scheme, the PCB is a rigid board, the bearing capacity is high, the defect of the FPC flexible substrate on the bearing capacity of the element is overcome, and the second circuit pattern layer is connected with the first circuit pattern layer to realize circuit connection between the FPC and the PCB.

Further, the PCB is provided with a plurality of electronic connectors, and the electronic connectors are electrically connected with an external main board.

In the scheme, the backboard is connected with the main board of the equipment through the electronic connectors distributed on the PCB, so that the effect that the backlight module provides a light source is exerted, the electronic connectors can ensure stable current circulation between the backlight module and the main board, and the electronic connectors are convenient to plug and pull, and convenient to assemble and maintain.

Further, one end of the backboard is provided with a step, and the back of the step is provided with a plurality of grooves.

In the scheme, the back plate is easy to shrink through injection molding, one of defects of an injection molding part is easy to shrink, volume shrinkage occurs in the cooling process, and pulling force towards center shrinkage is generated, so that pits appear on the surface of the back plate, and in order to avoid the occurrence of the situation, a groove is processed at one end with thicker back plate wall thickness, and the groove is a glue reducing groove, so that shrink deformation of the back plate can be effectively prevented.

Further, side walls are arranged around the back plate, and a plurality of protruding structures are arranged on the side walls.

In the scheme, the reflector plate, the light guide plate, the lamp strip, the diffusion sheet, the light enhancement sheet and the like are sequentially stacked on the back plate, the frame body is generally covered on the back plate, the back plate and the frame body are clamped through the protruding structure, the thickness of the backlight module can be reduced, and the backlight module is simple in installation and stable in structure.

A backlight module comprising the back plate structure of any one of the FPCs and PCBs provided in the above scheme.

In the scheme, the circuit board of the backlight module is a soft and hard combined board formed by connecting FPC and PCB through pressing, the bearing capacity of the PCB is good, a plurality of electronic connectors are distributed on the PCB and are connected with an external main board through the electronic connectors, the FPC can be freely bent and folded, the FPC can be processed according to the space layout requirement, the internal space of the backlight module can be saved, and the volume of the backlight module is reduced.

The back plate structure and the backlight module combined by the FPC and the PCB have the following beneficial effects:

first, simple structure, stability are equipped with the installation position on the backplate, install PCB and FPC in the installation position, and PCB and FPC are connected, and the circuit board of this backplate has the flexible advantage of soft board, has the rigidity board again and supports the advantage, and stable in structure, PCB are the rigidity board, and bearing capacity is stronger, has compensatied FPC flexible substrate not enough on the element bearing capacity.

Second, the quality is light, and FPC weight is lighter than PCB, can reduce the weight of end product, and thickness is also thinner than PCB, has improved the compliance of circuit board, can effectively reduce backlight unit's volume.

Drawings

Fig. 1 is a schematic structural diagram of a back plate according to an embodiment.

Fig. 2 is a schematic diagram of FPC and PCB mounting of an embodiment.

FIG. 3 is a schematic view of another view structure of the back plate according to an embodiment.

Reference numerals illustrate: 1. a back plate; 2. a mounting position; 3. a PCB; 4. an FPC; 5. an interface; 6. an electronic connector; 7. a sidewall; 8. a bump structure; 9. a groove; 10. and a support plate.

Detailed Description

The back plate structure and the backlight module of the utility model combining the FPC and the PCB are described in further detail below with reference to specific embodiments and drawings.

As shown in fig. 1 and 2, in a preferred embodiment, a back board structure combining an FPC4 and a PCB3 of the present utility model includes a back board 1, a mounting location 2 is provided on the back board 1, the mounting location 2 is divided into a rigid area and a flexible area, the rigid area is provided with the PCB3, the flexible area is provided with the FPC4, the PCB3 is located in a middle position of the back board 1, and the FPC4 is press-connected with the PCB3 and extends to an edge of the back board 1. The backboard 1 is provided with an L-shaped mounting position 2, the PCB3 is mounted in the middle of the backboard 1, the FPC4 is connected with the PCB3 and extends towards the edge of the backboard 1, the mounting area of the PCB3 is a rigid area, and the mounting area of the FPC4 is a flexible area, so that the circuit board of the backboard 1 has the advantages of flexible board and rigid board support, and has stable structure, and the wiring and connectors are greatly reduced by combining the PCB3 and the FPC 4.

As shown in fig. 2, in some embodiments, the PCB3 is connected to the FPC4 to form a rigid-flex board, and the mounting location 2 is L-shaped, and the rigid-flex board is tightly attached to the mounting location 2.

In the scheme, the PP and the copper foil are pressed together outside in a hot-pressing and cold-pressing mode for the plate manufactured by the inner layer, so that a new inner layer is formed, the PCB3 and the FPC4 are connected in a pressing mode to form a soft and hard combined plate, the soft and hard combined plate simultaneously has the characteristics of the FPC4 and the PCB3, the soft and hard combined plate can change shape according to a specific contour, the inner space of the backboard 1 can be saved, the volume of the backlight module is reduced, the stability of the rigid plate and the flexibility of the flexible plate form a stable structure, and the reliability of the backlight module is improved.

In the production process, firstly, the circuit and the appearance of the FPC4 are drawn according to the requirements, then, related files are processed, a circuit diagram of the PCB3 is planned and drawn, and after the PCB3 and the FPC4 are processed, seamless lamination is carried out, so that the soft and hard combined board is finally manufactured.

As shown in fig. 1, in some embodiments, the flexible region of the mounting site 2 is provided with a support plate 10, and the fpc4 is bonded to the support plate 10. The FPC4 is a flexible circuit board, the whole structure of the FPC4 is adhered to the supporting plate 10, the FPC4 has higher assembly reliability, the assembly workload can be greatly reduced, and the performance of a circuit is easily ensured.

As shown in fig. 2, in some embodiments, the FPC4 includes a flexible insulating film and a conductive substrate bonded to the flexible insulating film, the conductive substrate is provided with a first circuit pattern layer, and an end of the FPC4 remote from the PCB3 is provided with an interface 5 connected to the outside. FPC4 one end is connected with PCB3 pressfitting, and the other end is equipped with interface 5, and FPC4 passes through interface 5 to be connected with external circuit, and FPC4 can arrange wantonly according to space layout requirement, has reduced backlight unit's volume and weight, has good thermal diffusivity, easy assembly and connection.

As shown in fig. 2, in some embodiments, the PCB3 is a rigid circuit board, and a second circuit layer is disposed on the PCB3, and the first circuit layer and the second circuit layer are connected. The PCB3 is a rigid plate, has strong bearing capacity, overcomes the defect of the flexible substrate of the FPC4 in element bearing capacity, and realizes circuit connection between the FPC4 and the PCB3 by connecting the second circuit pattern layer with the first circuit pattern layer.

As shown in fig. 2, in some embodiments, a plurality of electronic connectors 6 are provided on the PCB3, and the electronic connectors 6 are electrically connected to an external motherboard. The backplate 1 is connected with the mainboard of equipment through the electronic connector 6 that distributes on the PCB3 to exert backlight unit and provide the effect of light source, the electronic connector 6 can guarantee the stable electric current circulation between backlight unit and the mainboard, and the convenient plug of electronic connector 6, convenient equipment and maintenance.

As shown in fig. 2, in some embodiments, one end of the back plate 1 is provided with a step, and the back surface of the step is provided with a plurality of grooves 9. The backplate 1 is through injection moulding, and one of the defects of injection molding is the shrink easily, takes place the volume shrink in the cooling process, produces the pulling force of shrink to the center for the pit appears on backplate 1's surface, in order to avoid the emergence of this kind of condition, processes recess 9 at the thicker one end of backplate 1 wall thickness, and this recess 9 is the groove of subtracting the glue, can effectively prevent the shrink deformation of backplate 11.

As shown in fig. 2 and 3, in some embodiments, the back plate 1 has a sidewall 7 around its periphery, and a plurality of protruding structures 8 are disposed on the sidewall 7. The reflector plate, the light guide plate, the lamp strip, the diffusion sheet, the light enhancement sheet and the like are sequentially stacked on the back plate 1, the frame body is generally covered on the back plate 1, the back plate 1 and the frame body are clamped through the protruding structure 8, the thickness of the backlight module can be reduced, and the backlight module is simple in installation and stable in structure.

As shown in fig. 2, in a preferred embodiment, a backlight module includes a back plate structure formed by combining the FPC4 and the PCB3 according to any one of the above embodiments. The circuit board of backlight unit is FPC4 and PCB3 and connects the soft or hard combined board that forms through the pressfitting, and PCB3 bearing capacity is better, and it has a plurality of electronic connectors 6 to distribute on PCB3, is connected with outside mainboard through electronic connector 6, and FPC4 can freely crooked, fold, processes according to the space layout requirement, can save backlight unit's inner space, reduces backlight unit's volume.

According to the back plate structure with the FPC4 and the PCB3 combined, and the working principle and the working process of the backlight module, the mounting position 2 is arranged on the back plate 1, the PCB3 and the FPC4 are mounted in the mounting position 2, the PCB3 and the FPC4 are connected in a pressing mode to form the soft and hard combined plate, the soft and hard combined plate simultaneously has the characteristics of the FPC4 and the PCB3, the soft and hard combined plate can change shape according to a specific contour, the inner space of the back plate 1 can be saved, the volume of the backlight module is reduced, the stability of the rigid plate and the flexibility of the flexible plate form a stable structure, the reliability of the backlight module is improved, one end of the FPC4 is in pressing connection with the PCB3, the other end of the FPC4 is provided with the interface 5, the FPC4 is connected with an external circuit through the interface 5, the back plate 1 is connected with a main plate of equipment through an electronic connector 6 distributed on the PCB3, and the concave groove 9 is processed at one end with a thicker wall thickness of the back plate 1, so that the shrinkage deformation of the back plate 1 is effectively prevented.

In the description of the present utility model, it should be understood that the terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

While the utility model has been described in conjunction with the specific embodiments above, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, all such alternatives, modifications, and variations are included within the spirit and scope of the following claims.

Claims

1. The utility model provides a backplate structure that FPC and PCB combine, includes backplate (1), its characterized in that, be equipped with installation position (2) on backplate (1), installation position (2) divide into rigidity region and flexible region, PCB (3) are installed in the rigidity region, FPC (4) are installed in flexible region, PCB (3) are located backplate (1) intermediate position, FPC (4) with PCB (3) pressfitting is connected and extends to backplate (1) edge.

2. The back plate structure combined by the FPC and the PCB according to claim 1, wherein the PCB (3) is connected with the FPC (4) to form a soft and hard combined plate, the installation position (2) is L-shaped, and the soft and hard combined plate is tightly attached to the installation position (2).

3. The back plate structure of the combination of the FPC and the PCB according to claim 2, wherein the flexible area of the mounting site (2) is provided with a support plate, and the FPC (4) is adhered to the support plate.

4. The back plate structure combined by the FPC and the PCB according to claim 1, wherein the FPC (4) comprises a flexible insulating film and a conductor substrate adhered to the flexible insulating film, a first circuit pattern layer is arranged on the conductor substrate, and an interface (5) connected with the outside is arranged at one end of the FPC (4) far away from the PCB (3).

5. The back plate structure of the combination of the FPC and the PCB according to claim 4, wherein the PCB (3) is a rigid circuit board, a second circuit pattern layer is provided on the PCB (3), and the first circuit pattern layer and the second circuit pattern layer are connected.

6. The FPC-PCB combined back plate structure according to claim 5, wherein a plurality of electronic connectors (6) are provided on the PCB (3), and the electronic connectors (6) are electrically connected to an external motherboard.

7. The back plate structure of the combination of the FPC and the PCB according to claim 1, wherein one end of the back plate (1) is provided with a step, and the back surface of the step is provided with a plurality of grooves (9).

8. The back plate structure combined by the FPC and the PCB according to claim 1, wherein side walls (7) are arranged on the periphery of the back plate (1), and a plurality of protruding structures (8) are arranged on the side walls (7).

9. A backlight module comprising a back plate structure of a combination of an FPC (4) and a PCB (3) as claimed in any one of claims 1 to 6.