CN204879716U - Backlight unit and liquid crystal disply device with flexible line way board location structure - Google Patents

Abstract

The utility model provides a backlight module with a flexible circuit board positioning structure. In one of the embodiments, the backlight module includes a flexible circuit board and a backboard, the flexible circuit board is provided with a positioning hole, the backboard is provided with a positioning protrusion that can match the positioning hole, and the positioning protrusion passes through the positioning hole and positioned in the positioning hole; in another embodiment, the backlight module includes a flexible circuit board and a plastic frame, the flexible circuit board is provided with a positioning hole, and the plastic frame is provided with a positioning protrusion that can match the positioning hole, The positioning protrusion passes through the positioning hole and is positioned in the positioning hole. The utility model facilitates the assembly of the flexible circuit board through the cooperation of the positioning protrusion and the positioning hole, can effectively locate the position of the flexible circuit board, and accurately control the extension length of the flexible circuit board, without affecting the connection between the flexible circuit board and the corresponding connection. The insertion and removal of the device avoids the difficulty of modules or customers assembling flexible circuit boards.

Description

Backlight module and liquid crystal display device with flexible circuit board positioning structure

technical field

The utility model relates to the field of display technology, in particular to a backlight module and a liquid crystal display device with a flexible circuit board positioning structure.

Background technique

Liquid crystal display (Liquid Crystal Display, LCD) has the advantages of good image quality, small size, light weight, low driving voltage, low power consumption, no radiation and relatively low manufacturing cost, and currently occupies a dominant position in the field of flat panel display. With the rapid development of electronic products towards lightness, thinness and miniaturization, almost all kinds of portable electronic products use liquid crystal display devices as display terminals, especially in notebook computers, desktop computers, smart TVs, smart phones, personal digital processors, etc. Wait for the product.

A liquid crystal display device mainly includes two parts: a display panel (panel) and a backlight module (backlight module). The function of the backlight module is mainly to provide a backlight source for the display panel. The backlight module mainly includes components such as a light source, a backplane, a reflector, a light guide plate, an optical film set, and a plastic frame. Wherein, the reflection plate, the light guide plate and the optical film group are set on the back plate, the plastic frame is set on the peripheral edge of the back plate and is used to support the display panel, and the light source is set on the side of the light guide plate to incident light into the light guide plate. In addition, when the thickness of the product is limited, the backlight module sometimes omits the backplane, and the support function of the backplane can be integrated on other parts of the product.

Liquid crystal display devices usually also include flexible circuit boards, such as backlight flexible circuit boards and panel flexible circuit boards, wherein the backlight flexible circuit boards provide wiring for the backlight source of the liquid crystal display device to connect to the power supply, and the panel flexible circuit boards are for the liquid crystal display panel. Shows the traces that provide the connected signals. Flexible Printed Circuit (FPC) is a highly flexible printed circuit board made of polyimide or polyester film as the base material. Before the backlight flexible circuit board and the panel flexible circuit board are installed on the liquid crystal display device, the backlight flexible circuit board and the panel flexible circuit board need to be positioned and soldered after positioning.

In the prior art, for models without a backplane, the flexible circuit board has no positioning structure. For models with a backplane, it mainly relies on drawing positioning lines on the backplane, and laying out the flexible circuit board under the guidance of the positioning line, but the flexible circuit board has not been effectively fixed, resulting in the actual operation. The positioning line cannot realize the precise positioning of the flexible circuit board. When the flexible circuit board is assembled skewed, the distance from the positioning line can only be judged visually, resulting in inaccurate positioning, inconvenient assembly of the flexible circuit board, and the extension length of the flexible circuit board cannot be effectively controlled. , Too long or too short will affect the plugging and unplugging of the flexible circuit board and the corresponding connector, making it difficult for modules or customers to assemble the flexible circuit board.

Utility model content

The purpose of the utility model is to provide a backlight module and a liquid crystal display device with a flexible circuit board positioning structure, so as to solve the problem that the flexible circuit board has no positioning structure and the positioning line of the backboard cannot properly position the flexible circuit board.

The utility model provides a backlight module with a flexible circuit board positioning structure, the backlight module includes a flexible circuit board and a backboard, the flexible circuit board is provided with a positioning hole, and the backboard is provided with a The positioning hole corresponds to a matching positioning protrusion, and the positioning protrusion passes through the positioning hole and is positioned in the positioning hole.

Further, the backlight module further includes a PCBA circuit board, a plastic frame, a light guide plate and a light bar, the plastic frame and the light guide plate are assembled on the front of the backplane, and the PCBA circuit board is assembled on the On the back of the backboard, one end of the flexible circuit board is connected to the light bar, the flexible circuit board is wound to the back of the backboard via the edge of the backboard and the other end of the flexible circuit board is connected to On the PCBA circuit board, the positioning protrusions are formed on the back of the back plate.

The utility model provides a backlight module with a flexible circuit board positioning structure, the backlight module includes a flexible circuit board and a plastic frame, the flexible circuit board is provided with a positioning hole, and the plastic frame is provided with a The positioning hole corresponds to a matching positioning protrusion, and the positioning protrusion passes through the positioning hole and is positioned in the positioning hole.

Further, the backlight module further includes a PCBA circuit board, a light guide plate and a light bar, the light guide plate is assembled on the front of the plastic frame, the PCBA circuit board is assembled on the back of the plastic frame, and the flexible One end of the circuit board is connected to the light bar, the flexible circuit board is wound to the back of the plastic frame via the edge of the plastic frame and the other end of the flexible circuit board is connected to the PCBA circuit board, The positioning protrusions are formed on the back of the plastic frame.

Further, one side of the rubber frame protrudes toward the inside of the rubber frame to form a platform, and the positioning protrusion is formed on the back of the platform.

Further, the number of the positioning protrusions is at least two, and the two positioning protrusions are respectively formed at both ends of one side of the rubber frame, and the number of the positioning holes is also at least two and respectively Corresponding to the two positioning protrusions.

Further, the backlight module further includes a PCBA circuit board, a light guide plate and a light bar, the light guide plate is assembled on the front of the plastic frame, the PCBA circuit board is assembled on the back of the plastic frame, and the flexible One end of the circuit board is connected to the light bar, and the flexible circuit board bypasses the side of the plastic frame provided with two positioning protrusions and then extends to the back of the plastic frame. The other end of the circuit board is connected to the PCBA circuit board, and two positioning protrusions are formed on the back of the plastic frame.

Further, the positioning protrusion is in the shape of a bent L-shaped hook. When the L-shaped positioning protrusion passes through the positioning hole, the L-shaped positioning protrusion is buckled on the flexible circuit board.

The utility model also provides a liquid crystal display device, comprising the above-mentioned backlight module with a flexible circuit board positioning structure.

The backlight module provided by the utility model has a flexible circuit board positioning structure, a positioning hole is provided on the flexible circuit board, and a positioning protrusion corresponding to the positioning hole is provided on the back plate or the plastic frame. The cooperation of the hole facilitates the assembly of the flexible circuit board, can effectively locate the position of the flexible circuit board, and accurately control the extension length of the flexible circuit board, and will not affect the plugging and unplugging of the flexible circuit board and the corresponding connector, thus avoiding mold It is difficult for groups or customers to assemble flexible circuit boards.

Description of drawings

FIG. 1 is a schematic diagram of an exploded structure of a backlight module with a flexible circuit board positioning structure in the first embodiment of the present invention.

FIG. 2 is an assembly diagram of FIG. 1 .

FIG. 3 is a schematic diagram of an exploded structure of a backlight module with a flexible circuit board positioning structure in the second embodiment of the present invention.

FIG. 4 is an assembly diagram of FIG. 3 .

FIG. 5 is a schematic diagram of an exploded structure of a backlight module with a flexible circuit board positioning structure in a third embodiment of the present invention.

FIG. 6 is an assembly diagram of FIG. 5 .

FIG. 7 is a schematic diagram of an exploded structure of a backlight module with a flexible circuit board positioning structure in the fourth embodiment of the present invention.

FIG. 8 is an assembly diagram of FIG. 7 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail. It can be understood that the specific embodiments described here are only used to explain the utility model, rather than limit the utility model. In addition, it should be noted that, for the convenience of description, only part of the utility model is shown in the accompanying drawings but not all content, and the size and size of the structures shown in the accompanying drawings are not actual or actual Proportional to the size of the structure.

first embodiment

Figure 1 is a schematic diagram of the exploded structure of the backlight module with a flexible circuit board positioning structure in the first embodiment of the present invention, Figure 2 is the assembly diagram of Figure 1, please refer to Figure 1 and Figure 2, the backlight module provided by this embodiment The set includes a flexible circuit board 10 and a backboard 20 , the flexible circuit board 10 is provided with a positioning hole 11 , and the backboard 20 is provided with a positioning protrusion 21 which can correspond to the positioning hole 11 . The positioning protrusion 21 and the positioning hole 11 form a flexible circuit board positioning structure, which can realize the positioning of the flexible circuit board 10 on the backplane 20 of the backlight module. When installing the flexible circuit board 10 , the positioning protrusion 21 on the backboard 20 passes through the positioning hole 11 on the flexible circuit board 10 and is positioned in the positioning hole 11 , so as to realize accurate positioning of the flexible circuit board 10 and the backboard 20 . Position the backplane 20 and the flexible circuit board 10 through the positioning protrusion 21 and the positioning hole 11, and the positioning can be completed at one time. Compared with the prior art positioning method for positioning the flexible circuit board 10 through the positioning line of the backplane 20, not only The efficiency of positioning and assembly is improved, and the accuracy of positioning is also improved.

In this embodiment, the size of the positioning hole 11 is set so that the positioning protrusion 21 can squeeze into the positioning hole 11 , so that the positioned backplane 20 and the flexible circuit board 10 are relatively fixed without falling off. When the size of the positioning hole 11 is equal to or slightly smaller than the size of the positioning protrusion 21, the positioning protrusion 21 can still squeeze into the positioning hole 11, and the flexible circuit board 10 can be stably fixed on the backplane. 20, the positioning accuracy can be improved. Moreover, the positioning protrusion 21 can be a positioning cylinder or a positioning block, and the positioning hole 11 can be a round hole or a square hole correspondingly.

In this embodiment, there are one positioning hole 11 and one positioning protrusion 21 . However, the number of positioning holes 11 and positioning protrusions 21 can also be greater than one, for example, the number of positioning holes 11 and positioning protrusions 21 is respectively 2 or more than 2, only the positioning holes 11 and positioning protrusions 21 Corresponding settings can be.

In this embodiment, the backlight module further includes a PCBA (Printed Circuit Board Assembly) circuit board 30, a plastic frame 40, a reflective plate 50, a light guide plate 60, and a light bar 70, wherein the plastic frame 40, the reflective plate 50, and the light guide plate 60 are assembled on the back plate 20, the PCBA circuit board 30 is assembled on the back of the backplane 20. The flexible circuit board 10 is used to connect the light bar 70 to the PCBA circuit board 30, one end of the flexible circuit board 10 is connected to the light bar 70, the flexible circuit board 10 is wound to the back of the back plate 20 via the edge of the back plate 20 and the flexible circuit The other end of the board 10 is connected to the PCBA circuit board 30 . The above-mentioned positioning protrusions 21 are formed on the back surface of the back plate 20 .

This embodiment provides a backlight module with a positioning structure for a flexible circuit board. By setting a positioning hole 11 on the flexible circuit board 10 and setting a positioning protrusion 21 corresponding to the positioning hole 11 on the back plate 20, the positioning The cooperation of the protrusion 21 and the positioning hole 11 facilitates the assembly of the flexible circuit board 10, can effectively locate the position of the flexible circuit board 10, and accurately control the extension length of the flexible circuit board 10 (that is, the positioning hole 11 or the positioning protrusion 21 The distance between the flexible circuit board 10 and the PCBA circuit board 30) will not affect the plugging and unplugging of the corresponding connectors on the flexible circuit board 10 and the PCBA circuit board 30, thereby avoiding the difficulty of modules or customers assembling flexible circuit boards. This embodiment is aimed at models with a backplane, that is, the backlight module is provided with a backplane 20 .

second embodiment

Fig. 3 is a schematic diagram of an exploded structure of a backlight module with a flexible circuit board positioning structure in the second embodiment of the present invention, Fig. 4 is an assembly diagram of Fig. 3, please refer to Fig. 3 and Fig. 4, this embodiment is aimed at The model of the board (such as a mobile phone), that is, the backlight module is not provided with a backplane. The backlight module provided in this embodiment includes a flexible circuit board 10 and a plastic frame 40. The flexible circuit board 10 is provided with a positioning hole 11. The glue The frame 40 is provided with a positioning protrusion 41 that can correspond to the positioning hole 11 . The positioning protrusion 41 and the positioning hole 11 form a flexible circuit board positioning structure, which can realize the positioning of the flexible circuit board 10 on the plastic frame 40 of the backlight module. When installing the flexible circuit board 10 , the positioning protrusion 41 on the plastic frame 40 passes through the positioning hole 11 on the flexible circuit board 10 , so as to realize accurate positioning of the flexible circuit board 10 and the plastic frame 40 . The plastic frame 40 and the flexible circuit board 10 are positioned through the positioning protrusion 41 and the positioning hole 11, and the positioning can be completed at one time. Efficiency, but also improve the accuracy of positioning.

In this embodiment, the size of the positioning hole 11 is set so that the positioning protrusion 41 can squeeze into the positioning hole 11 , so that the positioned plastic frame 40 and the flexible circuit board 10 are relatively fixed without falling off. When the size of the positioning hole 11 is equal to the size of the positioning protrusion 41 or slightly smaller than the size of the positioning protrusion 41, the positioning protrusion 41 can still be squeezed into the positioning hole 11, and the flexible circuit board 10 can be stably fixed on the plastic frame. 40, the positioning accuracy can be improved. Moreover, the positioning protrusion 41 can be a positioning cylinder or a positioning block, and the positioning hole 11 can be a round hole or a square hole correspondingly.

In this embodiment, there are one positioning hole 11 and one positioning protrusion 41 . However, the number of positioning holes 11 and positioning protrusions 41 can also be greater than one, for example, the number of positioning holes 11 and positioning protrusions 41 is 2 or more than 2, only the positioning holes 11 and positioning protrusions 41 Corresponding settings can be.

In this embodiment, the backlight module further includes a PCBA circuit board 30, a reflector 50, a light guide plate 60, and a light bar 70, wherein the reflector 50 and the light guide plate 60 are assembled on the front of the plastic frame 40, and the PCBA circuit board 30 is assembled on the glue. Box 40 on the back. The flexible circuit board 10 is used to connect the light bar 70 to the PCBA circuit board 30, one end of the flexible circuit board 10 is connected to the light bar 70, the flexible circuit board 10 is wound to the back of the plastic frame 40 via the edge of the plastic frame 40 and the flexible circuit The other end of the board 10 is connected to the PCBA circuit board 30 . The above-mentioned positioning protrusion 41 is formed on the back of the plastic frame 40, and the plastic frame 40 protrudes toward the inside of the plastic frame 40 on one side to form a platform portion 42, and the positioning protrusion 41 is formed on the back of the platform portion 42 .

This embodiment provides a backlight module with a flexible circuit board positioning structure. By providing positioning holes 11 on the flexible circuit board 10 and correspondingly setting positioning protrusions 41 corresponding to the positioning holes 11 on the plastic frame 40, the positioning The cooperation of the protrusion 41 and the positioning hole 11 facilitates the assembly of the flexible circuit board 10, can effectively locate the position of the flexible circuit board 10, and accurately control the extension length of the flexible circuit board 10 (that is, the positioning hole 11 or the positioning protrusion 41 The distance between the flexible circuit board 10 and the PCBA circuit board 30) will not affect the plugging and unplugging of the corresponding connectors on the flexible circuit board 10 and the PCBA circuit board 30, thereby avoiding the difficulty of modules or customers assembling flexible circuit boards.

third embodiment

Fig. 5 is a schematic diagram of an exploded structure of a backlight module with a flexible circuit board positioning structure in the third embodiment of the present invention, and Fig. 6 is an assembly diagram of Fig. 5, please refer to Fig. 5 and Fig. 6. The model of the backplane (such as a mobile phone), that is, the backlight module is not provided with a backplane. The backlight module provided in this embodiment includes a flexible circuit board 10 and a plastic frame 40. The flexible circuit board 10 is provided with a positioning hole 11. The plastic frame 40 is provided with a positioning protrusion 41 that can correspond to the positioning hole 11 . The positioning protrusion 41 and the positioning hole 11 form a positioning structure of the flexible circuit board 10, which can realize the positioning of the flexible circuit board 10 on the plastic frame 40 of the backlight module. Different from the second embodiment above, the number of positioning projections 41 on the plastic frame 40 in this embodiment is at least two, and the two positioning projections 41 are respectively formed at both ends of a side of the plastic frame 40 (in other words , the two positioning protrusions 41 are respectively located on two adjacent corners of the plastic frame 40), and the number of positioning holes 11 on the flexible circuit board 10 is also at least two and are set corresponding to the two positioning protrusions 41 respectively. In this embodiment, the positioning protrusion 41 can be a positioning cylinder or a positioning block, and the positioning hole 11 can be a round hole or a square hole correspondingly.

The backlight module in this embodiment further includes a PCBA circuit board (not shown), a reflector 50, a light guide plate 60 and a light bar 70, wherein the light guide plate 60 is assembled on the front of the plastic frame 40, and the reflector 50 and the PCBA circuit board Assembled on the back of the plastic frame 40. One end of the flexible circuit board 10 is connected to the light bar 70 , the flexible circuit board 10 bypasses the side of the plastic frame 40 provided with two positioning protrusions 41 and then extends to the back of the plastic frame 40 , the other end of the flexible circuit board 10 One end is connected to the PCBA circuit board, and the flexible circuit board 10 is pasted on the back of the reflection plate 50, as shown in FIG. 6 . Two positioning protrusions 41 are formed on the back of the plastic frame 40, and the two positioning protrusions 41 on the plastic frame 40 respectively pass through the two positioning holes 11 on the flexible circuit board 10, thereby realizing the connection between the flexible circuit board 10 and the plastic frame. 40 accurate positioning.

Fourth embodiment

Fig. 7 is a schematic diagram of an exploded structure of a backlight module with a flexible circuit board positioning structure in the fourth embodiment of the present invention. Fig. 8 is an assembly diagram of Fig. 7, please refer to Fig. 7 and Fig. 8. The model of the backplane (such as a mobile phone), that is, the backlight module is not provided with a backplane. The backlight module provided in this embodiment includes a flexible circuit board 10 and a plastic frame 40. The flexible circuit board 10 is provided with a positioning hole 11. The plastic frame 40 is provided with a positioning protrusion 41 that can correspond to the positioning hole 11 . The positioning protrusion 41 and the positioning hole 11 form a positioning structure of the flexible circuit board 10, which can realize the positioning of the flexible circuit board 10 on the plastic frame 40 of the backlight module. The number of positioning projections 41 on the plastic frame 40 in this embodiment is at least two, and the two positioning projections 41 are respectively formed on the two ends of a side of the plastic frame 40 (in other words, the two positioning projections 41 are respectively located On two adjacent corners of the plastic frame 40 ), the number of positioning holes 11 on the flexible circuit board 10 is also at least two, which are respectively provided corresponding to the two positioning protrusions 41 . One end of the flexible circuit board 10 is connected to the light bar 70 , the flexible circuit board 10 bypasses the side of the plastic frame 40 provided with two positioning protrusions 41 and then extends to the back of the plastic frame 40 , the other end of the flexible circuit board 10 One end is connected to the PCBA circuit board (not shown in the figure), and the flexible circuit board 10 is pasted on the back of the reflection plate 50, as shown in FIG. 8 . Two positioning protrusions 41 are formed on the back of the plastic frame 40, and the two positioning protrusions 41 on the plastic frame 40 respectively pass through the two positioning holes 11 on the flexible circuit board 10, thereby realizing the connection between the flexible circuit board 10 and the plastic frame. 40 accurate positioning. Different from the above-mentioned third embodiment, the positioning protrusion 41 in this embodiment is a bent L-shaped hook style, when the L-shaped positioning protrusion 41 on the plastic frame 40 passes through the positioning hole 11 on the flexible circuit board 10 At this time, the L-shaped positioning protrusion 41 is buckled on the flexible circuit board 10, which can prevent the flexible circuit board 10 from detaching from the plastic frame 40, and can also prevent the flexible circuit board 10 from tilting up.

The above are only preferred embodiments of the present utility model and applied technical principles. Those skilled in the art will understand that the utility model is not limited to the specific embodiments described here, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the utility model. Therefore, although the utility model has been described in detail through the above embodiments, the utility model is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the utility model. The scope of the present invention is determined by the appended claims.

Claims (9)

1. one kind has the backlight module of FPC location structure, it is characterized in that, described backlight module comprises FPC (10) and backboard (20), described FPC (10) is provided with locating hole (11), described backboard (20) be provided with can with the positioning convex (21) of described locating hole (11) Corresponding matching, described positioning convex (21) is through described locating hole (11) and be positioned in described locating hole (11).

2. there is the backlight module of FPC location structure as claimed in claim 1, it is characterized in that, described backlight module comprises PCBA circuit board (30) further, glue frame (40), light guide plate (60) and lamp bar (70), described glue frame (40) and described light guide plate (60) are assembled in the front of described backboard (20), described PCBA circuit board (30) is assembled in the back side of described backboard (20), one end of described FPC (10) is connected on described lamp bar (70), described FPC (10) via described backboard (20) edge around to described backboard (20) the back side and the other end of described FPC (10) is connected on described PCBA circuit board (30), described positioning convex (21) is formed on the back side of described backboard (20).

3. one kind has the backlight module of FPC location structure, it is characterized in that, described backlight module comprises FPC (10) and glue frame (40), described FPC (10) is provided with locating hole (11), described glue frame (40) be provided with can with the positioning convex (41) of described locating hole (11) Corresponding matching, described positioning convex (41) is through described locating hole (11) and be positioned in described locating hole (11).

4. there is the backlight module of FPC location structure as claimed in claim 3, it is characterized in that, described backlight module comprises PCBA circuit board (30) further, light guide plate (60) and lamp bar (70), described light guide plate (60) is assembled in the front of described glue frame (40), described PCBA circuit board (30) is assembled in the back side of described glue frame (40), one end of described FPC (10) is connected on described lamp bar (70), described FPC (10) via described glue frame (40) edge around to described glue frame (40) the back side and the other end of described FPC (10) is connected on described PCBA circuit board (30), described positioning convex (41) is formed on the back side of described glue frame (40).

5. there is the backlight module of FPC location structure as claimed in claim 4, it is characterized in that, described glue frame (40) side protrudes out formation platform part (42) in described glue frame (40) wherein, and described positioning convex (41) is formed on the back side of described platform part (42).

6. there is the backlight module of FPC location structure as claimed in claim 3, it is characterized in that, the quantity of described positioning convex (41) is at least two, two described positioning convex (41) are respectively formed at the two ends of a side of described glue frame (40), and the quantity of described locating hole (11) is also at least two and correspondingly with two described positioning convex (41) respectively arranges.

7. there is the backlight module of FPC location structure as claimed in claim 6, it is characterized in that, described backlight module comprises PCBA circuit board further, light guide plate (60) and lamp bar (70), described light guide plate (60) is assembled in the front of described glue frame (40), described PCBA circuit board group is contained in the back side of described glue frame (40), one end of described FPC (10) is connected on described lamp bar (70), described FPC (10) walks around the back side that side that described glue frame (40) is provided with two described positioning convex (41) extends to described glue frame (40) again, the other end of described FPC (10) is connected on described PCBA circuit board, two described positioning convex (41) are formed on the back side of described glue frame (40).

8. there is the backlight module of FPC location structure as claimed in claim 6, it is characterized in that, the L shape snap fit pattern that described positioning convex (41) is bending, when the described positioning convex (41) of L shape is through described locating hole (11), the described positioning convex (41) of L shape is buckled on described FPC (10).

9. a liquid crystal indicator, is characterized in that, comprises the backlight module with FPC location structure as described in any one of claim 1 to 8.