CN113835269B

CN113835269B - Backlight module and display device

Info

Publication number: CN113835269B
Application number: CN202111170272.2A
Authority: CN
Inventors: 谢天旭
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2021-10-08
Filing date: 2021-10-08
Publication date: 2023-08-29
Anticipated expiration: 2041-10-08
Also published as: CN113835269A

Abstract

The embodiment of the application provides a backlight module and a display device, wherein the backlight module comprises a lamp strip, a metal frame and a first circuit board, the lamp strip comprises a plurality of light emitting devices and a flexible circuit board, and the light emitting devices are fixed on the flexible circuit board; the metal frame comprises a tongue piece and an opening, and the opening is overlapped with the lamp strip part along the thickness direction of the backlight module; the first circuit board is fixedly connected with the tongue piece and comprises a convex structure, and the convex structure covers at least part of the area of the opening along the thickness direction of the backlight module. In the application, when the backlight module is impacted by cold and hot environments, the flexible circuit board is easy to bulge and deform. The convex structure in the first circuit board covers at least part of the area of the opening, can play a role in shielding similar to a metal frame, and effectively avoids the bulge of the part of the lamp strip exposed by the opening, so that the normal arrangement of the part of the light emitting devices is ensured, and the uniformity of the light emitting brightness of the display device is further ensured.

Description

Backlight module and display device

[ field of technology ]

The present application relates to the field of display technologies, and in particular, to a backlight module and a display device.

[ background Art ]

Since the liquid crystal display has many advantages such as light weight, energy saving, etc., the liquid crystal display is widely used in electronic devices such as high definition digital televisions, computers, mobile phones, digital cameras, etc. in daily life.

The backlight module is an important component of the liquid crystal display. In the prior art, the metal frame of the backlight module generally includes an opening. In the stability test process of the backlight module, other components in the backlight module are easy to deform and bulge at the opening of the metal frame, so that the normal light emission of the liquid crystal display is affected.

[ MEANS FOR SOLVING PROBLEMS ]

In view of the above, the embodiments of the present application provide a backlight module and a display device to solve the above-mentioned problems.

In a first aspect, an embodiment of the present application provides a backlight module, where the backlight module includes a light strip, a metal frame, and a first circuit board, the light strip includes a plurality of light emitting devices and a flexible circuit board, and the light emitting devices are fixed on the flexible circuit board; the metal frame comprises a tongue piece and an opening, and the opening is overlapped with the lamp strip part along the thickness direction of the backlight module; the first circuit board is fixedly connected with the tongue piece and comprises a convex structure, and the convex structure covers at least part of the area of the opening along the thickness direction of the backlight module.

In an implementation manner of the first aspect, the backlight module further includes a light guide plate, and the light guide plate is connected with the flexible circuit board; and the light guide plate is positioned on one side of the flexible circuit board away from the opening.

In one implementation manner of the first aspect, the flexible circuit board includes a first area and a second area, the light emitting device is located on a side of the flexible circuit board away from the opening and is fixedly connected to the first area of the flexible circuit board, and the light guide plate is fixedly connected to the second area of the flexible circuit board.

In an implementation manner of the first aspect, along a thickness direction of the backlight module, a portion of the first area overlapping the opening is a first portion, and a portion of the second area overlapping the opening is a second portion; the length of the first part along the first direction is L1, and the length of the second part along the first direction is L2; the first direction intersects with the direction in which the opening points toward the tongue; wherein L2 is less than L1.

In one implementation of the first aspect, the male formation is located in the opening.

In an implementation manner of the first aspect, the convex structure covers at least 90% of the opening area along a thickness direction of the backlight module.

In an implementation manner of the first aspect, the first circuit board includes a component and a signal line, and along a thickness direction of the first circuit board, the component and the signal line do not overlap with the convex structure.

In one implementation of the first aspect, the shape of the opening is the same as the shape of the male structure.

In one implementation of the first aspect, the opening is one of rectangular, trapezoidal, and semicircular in shape.

In a second aspect, an embodiment of the present application provides a display device, where the display device includes the backlight module and the display panel provided in the first aspect, and the display panel is located on a side of the backlight module, which is close to a light emitting surface of the display device.

In one implementation of the second aspect, the display panel is a liquid crystal display panel.

It can be understood that the flexible circuit board in the lamp strip is made of flexible materials, and when the backlight module is impacted by cold and hot environments, the flexible circuit board is easy to bulge and deform. However, due to shielding of the metal frame, the flexible circuit board can be prevented from being bulged and deformed, so that the flexible circuit board is kept stable. However, due to the existence of the opening, the part of the flexible circuit board exposed in the opening is subjected to bulge deformation, so that the position of the light emitting device connected with the flexible circuit board exposed in the opening is changed, and the part of the lamp strip exposed in the opening is different from the parts at other positions in light-emitting brightness, and the normal light emission of the display device is affected.

In the application, when the backlight module is subjected to cold and hot environment change, the convex structure in the first circuit board covers at least part of the area of the opening, thereby playing a role of shielding similar to a metal frame, effectively avoiding the bulge of the part of the lamp strip exposed by the opening, ensuring the normal arrangement of the part of the light emitting devices and further ensuring the uniformity of the light emitting brightness of the display device.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a backlight module in the prior art;

fig. 2 is a cross-sectional view taken along line A-A' in fig. 1. The method comprises the steps of carrying out a first treatment on the surface of the

FIG. 3 is a schematic diagram showing deformation of the backlight module before and after stability testing;

fig. 4 is a schematic diagram of a backlight module according to an embodiment of the application;

FIG. 5 is a schematic view of a lamp strip according to an embodiment of the present application;

fig. 6 is an assembly schematic diagram of a backlight module according to an embodiment of the application;

FIG. 7 is a cross-sectional view taken along line A-A' of FIG. 4;

FIG. 8 is a further cross-sectional view taken along line A-A' in FIG. 4;

FIG. 9 is a schematic diagram illustrating a deformation of a backlight module according to the present application;

fig. 10 is a schematic diagram of a partial structure of a backlight module according to an embodiment of the application;

fig. 11 is an exploded view of a backlight module according to an embodiment of the present application;

FIG. 12 is an enlarged view of the open area of FIG. 11;

fig. 13 is an exploded view of a backlight module according to another embodiment of the present application;

fig. 14 is an exploded view of a backlight module according to another embodiment of the present application;

fig. 15 is a schematic diagram of a portion of a backlight module according to an embodiment of the application;

fig. 16 is a schematic diagram of a first circuit board according to an embodiment of the present application;

fig. 17 is a schematic diagram of a first circuit board according to an embodiment of the present application;

fig. 18 is a schematic diagram of a display device according to an embodiment of the application.

[ detailed description ] of the application

For a better understanding of the technical solution of the present application, the following detailed description of the embodiments of the present application refers to the accompanying drawings.

It should be understood that the described embodiments are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the present specification, it is to be understood that the terms "substantially," "approximately," "about," "approximately," "substantially," and the like as used in the claims and embodiments of the application are intended to be inclusive of a reasonable process operation or tolerance and not an exact value.

It should be understood that although the terms first, second, third, etc. may be used in embodiments of the present application to describe portions, regions, etc., these portions, regions, etc. should not be limited by these terms. These terms are only used to distinguish one portion, region or the like from another. For example, a first region may also be referred to as a second region, and similarly, a second region may also be referred to as a first region, without departing from the scope of embodiments of the present application.

The applicant has provided a solution to the problems existing in the prior art by intensive studies.

Fig. 1 is a schematic diagram of a backlight module in the prior art, and fig. 2 is a cross-sectional view taken along line A-A' in fig. 1.

In the prior art, as shown in fig. 1 and 2, a backlight module 001' includes a lamp strip 01', a metal frame 02' and a printed circuit board 03', wherein the printed circuit board 03' is used for transmitting control signals and is fixed with the metal frame 02' of the backlight module 001 '. There are two common ways of fixing the printed circuit board 03': one is to paste a heat conductive tape between the printed circuit board 03 'and the metal frame 02', and paste the printed circuit board 03 'on the back of the metal frame 02'; the other is to lock the printed circuit board 03 'and the metal frame 02' with screws. The screw locking is adopted, so that the device has the advantages of reliable connection, simple assembly and good shock resistance, can remarkably save materials, and realizes the function of quickly mounting or dismounting the printed circuit board 03'. Meanwhile, compared with the high cost of the heat-conducting adhesive tape and the increase of the thickness of the module, the screw locking cost is obviously lower.

In the prior art, in order to save the cost, the tongue piece 21 'is usually directly punched on the metal frame 02', and then the tongue piece 21 'is bent away from the lamp strip 01'. The printed circuit board 03 'is locked to the tongue piece 21' by screws, and the printed circuit board 03 'is further locked to the metal frame 02'. So that the printed circuit board 03 'is reliably connected to the metal frame 02'. However, since the tongue piece 21 'is directly punched on the metal frame 02', the opening 22 'is left on the metal frame 02' after the tongue piece 21 'is bent away from the lamp strip 01'. So that the opening 22' at least partially overlaps the lamp strip 01' in the thickness direction of the backlight module 001', that is, at least part of the lamp strip 01' is exposed by the opening 22'.

With continued reference to fig. 2, it is to be appreciated that the light strip 01' may also include light emitting devices. And the upper part of the backlight module 001' also comprises a reflecting sheet, a light guide plate, a lower diffusion sheet, a lower light enhancement sheet, an upper diffusion sheet and the like which are arranged in a laminated manner along the thickness direction of the display device. In addition, a display panel including a lower polarizer, a driving layer, a color resist layer, an upper polarizer and an Integrated Circuit (IC) board may be disposed above the backlight module 001, and the backlight module 001' provides backlight for the display panel. The integrated circuit board IC is electrically connected to the printed circuit board 03' through a connection circuit board, which may be a flexible printed circuit board. Wherein, the lamp area 01' is connected with the light guide plate through lamp glue.

Fig. 3 is a schematic diagram of deformation before and after a backlight module stability test.

As shown in fig. 3, the lamp strip 01' includes a light emitting device 11' and a flexible circuit board 12'. The inventor finds that in the process of performing stability test on the backlight module 001', the portion of the lamp strip 01' located in the opening 22' is deformed and raised, so that normal light emission of the display device is affected.

For example, when the backlight module 001 'performs a cold and hot impact test, the backlight module 001' is placed in a high and low temperature test box of-20 ℃ for 30 minutes, and then the temperature of the high and low temperature test box is adjusted to 65 ℃ and maintained for 30 minutes. After 100 cycles, the backlight module 001' is taken out from the test box, and the portion of the lamp strip 01' located at the opening 22' can be obviously found to bulge and deform. The backlight module 001 'with the bulge deformation is used in a display device, and obvious uneven light emission occurs at the position of the display device corresponding to the opening 22', so that the normal light emission of the display device is affected.

The applicant of the present application has made intensive studies to provide a solution to the problems existing in the prior art.

Fig. 4 is a schematic diagram of a backlight module according to an embodiment of the present application, fig. 5 is a schematic diagram of a lamp strip according to an embodiment of the present application, fig. 6 is an assembly schematic diagram of a backlight module according to an embodiment of the present application, and fig. 7 is a cross-sectional view along a line A-A' in fig. 4. It should be noted that, the backlight module 001 shown in fig. 7 is a cross-sectional view corresponding to the backlight module shown in fig. 4, and in order to facilitate understanding of the technical solution of the present application, fig. 7 is a cross-sectional view of not only the backlight module 001 but also a cross-sectional view of the display panel 002 corresponding to the backlight module 001. Further, fig. 7 schematically illustrates the structure of the backlight module 001, and the backlight module 001 may have other structures adopting the inventive concept; correspondingly, fig. 7 only schematically shows the structure of the display panel 002, and the display panel 002 may have other structures.

Referring to fig. 4 to fig. 7, an embodiment of the application provides a backlight module 001, which includes a lamp strip 01, a metal frame 02 and a first circuit board 03. The light strip 01 includes a plurality of light emitting devices 11 and a flexible circuit board 12, and the light emitting devices 11 are fixed on the flexible circuit board 12. The metal frame 02 includes a tongue piece 21 and an opening 22, and the opening 22 at least partially overlaps the lamp strip 01 in the thickness direction of the backlight unit 001. That is, at least a portion of the light strip 01 is exposed by the opening 22.

The first circuit board 03 is fixedly connected to the tongue piece 21, and the first circuit board 02 may be disposed on a back side of the tongue piece 21 facing the back of the metal frame 02, and the two may be fixed in contact. The first circuit board 03 includes a convex structure 31, and the convex structure 31 covers at least a partial area of the opening 22 in a thickness direction of the backlight module 001. Alternatively, the male formation 31 may cover a partial region of the opening 22; alternatively, the male formation 31 may also completely cover the opening 22. It is understood that the convex structure 31 at least partially overlaps the opening 22 and the light strip 01 along the thickness direction of the backlight module 001, and the light strip 01 and the convex structure 31 are disposed on opposite sides of the metal frame 02, respectively.

As shown in fig. 6, the backlight module 001 is assembled, a tongue piece 21 is punched on a metal frame 02, and after the tongue piece 21 is perforated, the metal frame 02 is mounted on the outer side of the internal structure (such as a lamp strip 01) of the backlight module 001; then preparing a first circuit board 03 including the convex structure 31, and making an opening on the first circuit board 03; the first circuit board 03 is aligned with the tongue piece 21 so that the convex structure 31 covers at least a part of the area of the opening 22, and the first circuit board 03 and the tongue piece 21 are locked by screws, so that the first circuit board 03 is reliably fixed on the metal frame 02.

The base material of the flexible circuit board 12 in the lamp strip 01 is a flexible material, and when the backlight module 001 is subjected to a change of cold and hot environments, the flexible circuit board 12 is easy to deform. Since the metal frame 02 shields part of the position of the flexible circuit board 12, the flexible circuit board 12 can be prevented from being deformed by bulge towards the back of the metal frame 02, so that the flexible circuit board 12 is kept stable.

In the prior art, this causes the portion of the flexible circuit board 12 exposed in the opening 22 to be subjected to bulging deformation due to the presence of the opening 22, thereby causing the position of the light emitting device 11 connected to the flexible circuit board 12 exposed in the opening 22 to be changed. And thus causes the portion of the lamp strip 01 exposed by the opening 22 to be different from the portion at other positions in light emission brightness, affecting the normal light emission of the display device.

In the application, when the backlight module 001 is subjected to cold and hot environment change, the convex structure 31 in the first circuit board 03 covers at least part of the area of the opening 22, which can play a role similar to the shielding effect of the metal frame 02, effectively avoid the bulge of the part of the lamp strip 01 exposed by the opening 22, thereby ensuring the normal arrangement of the part of the light emitting devices 11 and further ensuring the uniformity of the light emitting brightness of the display device.

Fig. 8 is a further cross-sectional view taken along line A-A' in fig. 4. It should be noted that, the backlight module 001 shown in fig. 8 is another cross-sectional view corresponding to the backlight module shown in fig. 4, and in order to facilitate understanding of the technical solution of the present application, fig. 8 is a cross-sectional view of not only the backlight module 001 but also a cross-sectional view of the display panel 002 corresponding to the backlight module 001. Further, fig. 8 schematically illustrates the structure of the backlight module 001, and the backlight module 001 may have other structures adopting the inventive concept; correspondingly, fig. 8 only schematically shows the structure of the display panel 002, and the display panel 002 may have other structures.

In one implementation of the present embodiment, as shown in fig. 8, the convex structure 31 covers at least a part of the area of the opening 22 in the thickness direction of the backlight module 001, but the convex structure 31 is not located in the opening 22. It will be appreciated that the male formation 31 lies in a plane parallel to the plane of the opening 22. It should be noted that the upper surface of the convex structure 31 facing the direction of the tongue 12 is not higher than the lower surface of the opening 22 facing away from the tongue. Due to the shielding effect of the convex structure 31, the flexible circuit board 12 is prevented from being raised to a large extent, and the flexible circuit board 12 can not drive the arrangement of the light emitting devices 11 to be changed obviously, so that the influence on the normal light emission of the display device is avoided.

In another implementation of the present embodiment, as shown in fig. 7, the convex structure 31 covers at least a part of the area of the opening 22 in the thickness direction of the backlight module 001, and the convex structure 31 is located in the opening 22. It will be appreciated that the male formation 31 fills the opening 22 to some extent. In this implementation manner, the shielding effect of the convex structure 31 is fully exerted, and the part of the flexible circuit board 12 located in the opening 22 is prevented from being raised, so that the arrangement of the light emitting devices 11 of the part is ensured, and the normal light emission of the display device is further ensured to be influenced.

Fig. 9 is a schematic diagram illustrating deformation of a backlight module according to the present application.

In one embodiment of the present application, as shown in fig. 7, the backlight module 001 further includes a light guide plate 04, wherein the light guide plate 04 is connected to the flexible circuit board 12 in the light strip 01, and the light guide plate 04 is located at a side of the flexible circuit board 12 away from the opening 22. The light guide plate 04 is not connected to the light emitting device 11 in the light band 01. The light emitting device 11 may be located at a side of the light guide plate 04. Wherein, the light guide plate 04 can be connected with the flexible circuit board 12 through the lamp glue M.

The light guide plate 04 is easily deformed by shrinkage at low temperature, and as shown in fig. 9, when the backlight module 001 is affected by a low temperature environment, the light guide plate 04 is deformed by shrinkage. Since the light guide plate 04 is connected with the flexible circuit board 12, the light guide plate 04 drives the flexible circuit board 12 to deform. It will be appreciated that, due to the shrinkage deformation of the light guide plate 04, the portion of the flexible circuit board 12 connected thereto may be subject to bulge deformation. But due to the shielding of the metal frame 02, the flexible circuit board 12 can be prevented from being raised for the most part, so that the flexible circuit board 12 is kept stable. However, due to the presence of the opening 22, the portion of the flexible circuit board 12 exposed by the opening 22 is deformed by bulge, so that the position of the light emitting device 11 connected with the flexible circuit board 12 exposed in the opening 22 is changed, and the light emitting brightness of the portion of the light strip 01 exposed in the opening 22 at other positions is different, so that the normal light emission of the display device is affected.

In the application, when the backlight module 001 is affected by low-temperature environment and the light guide plate 04 is shrunk and deformed, the convex structure 31 in the first circuit board 03 covers at least part of the area of the opening 22, which can play a role similar to shielding of the metal frame 02, effectively avoid the bulge of the part of the lamp strip 01 exposed by the opening 22, thereby ensuring the normal arrangement of the part of the light emitting devices 11 and further ensuring the uniformity of the light emitting brightness of the display device.

Fig. 10 is a schematic diagram of a partial structure of a backlight module according to an embodiment of the application.

In one embodiment of the present application, referring to fig. 7 and 10, the flexible circuit board 12 includes a first region 12A and a second region 12B, and the light emitting device 11 is located on a side of the flexible circuit board 12 remote from the opening 22 and fixedly connected to the first region 12A of the flexible circuit board 12. The light guide plate 04 is fixedly connected with the second region 12B of the flexible circuit board 12. It should be noted that the first region 12A and the second region 12B of the flexible circuit board 12 are integral. The light guide plate 04 may be connected to the second region 12B of the flexible circuit board 12 through a lamp paste M.

It is understood that the light emitting device 11 is located on the same side of the flexible circuit board 12 as the light guide plate 04, and that the light emitting device 11 is not connected to the light guide plate 04. Alternatively, the light emitting device 11 is located at a side of the light guide plate 04.

When the backlight module 001 is affected by the low temperature environment, the light guide plate 04 is shrunk and deformed. Since the light guide plate 04 is connected to the second region 12B of the flexible circuit board 12, the light guide plate 04 drives the flexible circuit board 12 to deform. It can be understood that, due to the shrinkage deformation of the light guide plate 04, the light guide plate 04 drives the second region 12B of the flexible circuit board 12 to bulge. Thereby driving the first region 12A of the flexible circuit board 12 to bulge. It will be appreciated that the second region 12B is raised to a greater extent than the first region 12A. Further, since the light emitting device 11 is fixedly connected to the first region 12A of the flexible circuit board 12, the first region 12A of the flexible circuit board 12 bulges, so that the position of the light emitting device 11 is changed. The flexible circuit board 12 covered by the metal frame 02 is not bulged, and further, it is ensured that the light emitting device 11 connected to the flexible circuit board 12 covered by the metal frame 02 is not changed in position. However, due to the presence of the opening 22, the portion of the flexible circuit board 12 exposed by the opening 22 is deformed by bulge, so that the position of the light emitting device 11 connected with the flexible circuit board 12 exposed in the opening 22 is changed, and the light emitting brightness of the portion of the light strip 01 exposed in the opening 22 at other positions is different, so that the normal light emission of the display device is affected.

Fig. 11 is an exploded view of a backlight module according to an embodiment of the application, and fig. 12 is an enlarged view of an opening area in fig. 11.

Referring to fig. 10, 11 and 12, in one embodiment of the present application, along the thickness direction of the backlight module 001, a portion of the flexible circuit board 12 where the first area 12A overlaps the opening 22 is a first portion 121, and a portion of the flexible circuit board 12 where the second area 12B overlaps the opening 22 is a second portion 122. The length of the first portion 121 along the first direction X is L1, and the length of the second portion 122 along the first direction Y is L2. The direction in which the opening 22 points toward the tongue piece 21 is a second direction X, and the first direction Y intersects the second direction X. It will be appreciated that the first portion 121 is the portion of the first region 12A of the flexible circuit board 12 exposed in the opening 22, and the second portion 122 is the portion of the second region 12B of the flexible circuit board 12 exposed in the opening 22.

Wherein L2 is less than L1. That is, the length of the first portion 121 in the first direction X is greater than the length of the second portion 122 in the first direction X. That is, in the portion where the flexible circuit board 12 overlaps the opening 22, the length of the portion where the flexible circuit board 12 is connected to the light emitting device 11 is longer than the length of the portion where the flexible circuit board 12 is connected to the light guide plate 04 in the first direction X. That is, in the first direction X, the portion of the flexible circuit board 12 connected to the light emitting device 11 is exposed by the opening 22 longer than the portion of the flexible circuit board 12 connected to the light guide plate 04 is exposed by the opening 22.

It can be understood that when the light guide plate 04 is deformed by shrinkage, the light guide plate 04 drives the flexible circuit board 12 connected with the light guide plate 04 to deform, and further, the flexible circuit board 12 connected with the light guide plate 04 drives the flexible circuit board 12 connected with the light emitting device 11 in the part of the flexible circuit board 12 exposed by the opening 22. By designing the second region 12B of the opening 22 to be shorter than the second region 12B of the flexible circuit board 12, the area of the flexible circuit board 12 covered by the metal frame 02 is increased, and the risk of bulging is reduced, so that the risk of bulging of the whole part of the flexible circuit board 12 exposed by the opening 22 is reduced.

With continued reference to fig. 4, in one embodiment of the present application, the convex structure 31 covers at least 90% of the area of the opening 22 along the thickness direction of the backlight module 001. It will be appreciated that the direction of extension of the male formation 31 is parallel to the direction in which the tongue 21 points towards the opening 22, the male formation 31 mainly covering the part of the opening 22 close to the tongue 21 and the part of the opening close to the intermediate position.

In the embodiment of the application, the convex structure 31 can play a role of shielding, so that the part of the lamp strip 01 positioned in the opening 22 is effectively prevented from being raised, the arrangement of the part of the light emitting devices 11 is prevented from being influenced, and the normal light emission of the display device is prevented from being influenced. Meanwhile, since the projection structure 31 mainly covers the portion of the opening 22 near the tongue piece 21 and the portion of the opening 22 near the intermediate position, the alignment accuracy of the projection structure 31 and the opening 22 is reduced. Particularly, when the convex structure 31 is positioned in the opening 22, the embodiment of the application reduces the alignment difficulty of the convex structure 31 and the opening 22, is beneficial to reducing the preparation difficulty of the convex structure 31 and improving the product yield.

Fig. 13 is an exploded view of a backlight module according to an embodiment of the application, and fig. 14 is an exploded view of a backlight module according to an embodiment of the application.

In one embodiment of the application, the shape of the opening 22 is the same as the shape of the male formation 31. For example, as shown in fig. 4, the shape of the opening 22 and the shape of the convex structure 31 are rectangular, or as shown in fig. 13, the shape of the opening 22 and the shape of the convex structure 31 are trapezoidal.

It will be appreciated that the shape of the opening 22 is identical to the shape of the male structure 31, which is advantageous in that the shape of the male structure 31 is as identical as possible to the shape of the light strip 01 exposed by the opening 22, thereby effectively supporting the light strip 01. When the backlight module 001 is affected by the cold and hot environment, the part of the lamp strip 01 exposed by the opening 22 is effectively prevented from being raised, so that the normal arrangement of the light emitting devices 11 in the part of the lamp strip 01 is ensured, and the normal light emission of the display device is prevented from being affected.

It should be noted that the shape of the convex structure 31 may also be different from the shape of the opening 22. For example, as shown in fig. 14, the opening 22 has a trapezoidal shape, and the convex structure 31 has a rectangular shape.

Fig. 15 is a schematic diagram of a portion of a backlight module according to an embodiment of the application.

In an embodiment of the present application, referring to fig. 4, 13 and 15, the shape of the opening 22 may be one of rectangular, trapezoidal and semicircular. It should be noted that the shape of the opening 22 may also be a parallelogram or other irregular shape. Further, the shape of the convex structure 31 may be the same as the shape of the opening 22, and as shown in fig. 4, the shape of the opening 22 is rectangular, and the shape of the convex structure 31 is also rectangular. The shape of the convex structure 31 may also be different from the shape of the opening 22, as shown in fig. 14, the shape of the opening 22 is trapezoidal, and the shape of the convex structure 31 is rectangular.

In an embodiment of the present application, the shape of the male formation 31 and the shape of the opening 22 may be identical, for example, when the shape of the opening 22 is rectangular, the shape of the male formation 31 may be rectangular.

The shape of the male formation 31 and the opening 22 may also be different. For example, when the shape of the opening 22 is rectangular, the shape of the male formation 31 may be trapezoidal.

It should be noted that, whether the shape of the opening 22 is the same as the shape of the convex structure 31 or not, the convex structure 31 may be located in the opening 22 or on a side of the opening 22 away from the light emitting surface of the display device.

Fig. 16 is a schematic diagram of a first circuit board according to an embodiment of the present application, and fig. 17 is a schematic diagram of a first circuit board according to another embodiment of the present application.

In one embodiment of the present application, as shown in fig. 16, the first circuit board 03 includes a component 32 and a signal line 33, and the component 32 and the signal line 33 do not overlap with the convex structure 31 along the thickness direction of the first circuit board 03. That is, the component 32 and the signal line 33 are not provided on the convex structure 31.

It can be appreciated that the first circuit board 03 is locked to the metal frame 02 by fixedly connecting the first circuit board 03 to the tongue piece 21. It is possible to make the mounting of the first circuit board 03 stable and to facilitate the mounting operation of the first circuit board 03. The first circuit board 03 may be connected to the tongue piece 21 by a screw.

Since the convex structure 31 in the first circuit board 03 covers at least a part of the area of the opening 22 in the thickness direction of the backlight module 001, the convex structure 31 may be a protrusion of the first circuit board 03 toward the opening 22. I.e. the first circuit board 03 may be disposed entirely, with the plane of the first circuit board 03 being parallel to the plane of the opening 22. It should be noted that, as shown in fig. 17, the first circuit board 03 may further include a bent portion 3A, that is, the first circuit board 03 may include portions respectively located in two different planes. For example, the first circuit board 03 includes a bent portion 3A in a plane intersecting a plane of the convex structure 31.

In the present application, along the thickness direction of the first circuit board 03, the component 32 and the signal line 33 do not overlap with the convex structure 31, so that the design difficulty of the first circuit board 03 is not increased. The male structures 31 may be integrally formed with the substrate of the first circuit board 03 in a process. At least partial area of the opening 22 is shielded by the convex structure 31, so that the flexible circuit board 12 is prevented from being raised, the design difficulty of the first circuit board 03 is not increased additionally, and the preparation and the installation of the first circuit board 03 are facilitated.

As shown in fig. 18, an embodiment of the present application provides a display device 100, where the display device 100 includes the backlight module 001 provided in any one of the above embodiments. The display device 100 provided in the embodiment of the application may be a mobile phone, or may be a display device such as a computer or a television.

The display device 100 further includes a display panel 002, where the display panel 002 is located at a side of the backlight module 001 near the light emitting surface of the display device 100. The display panel 002 may be a liquid crystal display panel.

It is understood that, when the display device 100 is impacted by a cold or hot environment, the flexible circuit board 12 in the backlight module 001 included in the display device is easily deformed by swelling. Due to the shielding of the metal frame 02, the flexible circuit board 12 can be prevented from being deformed by bulge, so that the flexible circuit board 12 is kept stable. However, due to the presence of the opening 22, the portion of the flexible circuit board 12 exposed in the opening 22 is deformed to bulge, so that the position of the light emitting device 11 connected to the flexible circuit board 12 exposed in the opening 22 is changed, and the portion of the light strip 01 exposed in the opening 22 at other positions is different in light emitting brightness, which affects the normal light emission of the display device 100.

In the application, when the display device 100 is impacted by cold and hot environments, the convex structure 31 in the first circuit board 03 covers at least part of the area of the opening 22, which can play a role similar to shielding of the metal frame 02, and effectively avoid the bulge of the part of the lamp strip 01 in the opening 22, thereby avoiding affecting the arrangement of the part of the light emitting devices 11 and further avoiding affecting the normal light emission of the display device 100.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the application.

Claims

1. A backlight module comprises a lamp belt, a metal frame and a first circuit board;

wherein the lamp strip comprises a plurality of light emitting devices and a flexible circuit board; the light emitting device is fixed on the flexible circuit board;

the metal frame comprises a tongue piece and an opening, and the opening is overlapped with the lamp strip part along the thickness direction of the backlight module;

the first circuit board is fixedly connected with the tongue piece;

characterized by comprising the following steps:

the first circuit board comprises a convex structure, and the convex structure covers at least part of the area of the opening along the thickness direction of the backlight module.

2. The backlight module according to claim 1, further comprising a light guide plate connected to the flexible circuit board; the light guide plate is positioned on one side of the flexible circuit board away from the opening.

3. The backlight module according to claim 2, wherein the flexible circuit board comprises a first region and a second region, the light emitting device is located at a side of the flexible circuit board away from the opening and is fixedly connected with the first region of the flexible circuit board, and the light guide plate is fixedly connected with the second region of the flexible circuit board.

4. A backlight module according to claim 3, wherein in a thickness direction of the backlight module, a portion of the first region overlapping the opening is a first portion, a portion of the second region overlapping the opening is a second portion, a length of the first portion in the first direction is L1, and a length of the second portion in the first direction is L2; the first direction intersects the direction in which the opening points toward the tongue;

wherein L2 is less than L1.

5. A backlight module according to claim 1, wherein the convex structure is located in the opening.

6. A backlight module according to claim 1, wherein the convex structure covers at least 90% of the opening area in the thickness direction of the backlight module.

7. The backlight module according to claim 1, wherein the first circuit board comprises a component and a signal line, and the component and the signal line do not overlap with the convex structure along the thickness direction of the first circuit board.

8. A backlight module according to claim 1, wherein the shape of the opening is the same as the shape of the convex structure.

9. The backlight module according to claim 1, wherein the opening has one of a rectangular shape, a trapezoidal shape, and a semicircular shape.

10. A display device, characterized in that the display device comprises a backlight module and a display panel according to any one of claims 1-9; the display panel is positioned at one side of the backlight module, which is close to the light emitting surface of the display device.

11. The display device of claim 10, wherein the display panel is a liquid crystal display panel.