CN113835269A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN113835269A CN113835269A CN202111170272.2A CN202111170272A CN113835269A CN 113835269 A CN113835269 A CN 113835269A CN 202111170272 A CN202111170272 A CN 202111170272A CN 113835269 A CN113835269 A CN 113835269A
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- circuit board
- opening
- backlight module
- flexible circuit
- convex structure
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
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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 partially overlapped with the lamp strip 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 partial area of the opening along the thickness direction of the backlight module. In this application, when backlight unit receives cold and hot environment and assaults, the flexible circuit board takes place the uplift deformation easily. The convex structure in the first circuit board covers at least partial region of the opening, can play the effect of sheltering from of similar metal frame, effectively avoids the portion's that the lamp area is exposed by the opening uplift to guarantee this partial luminescent device's normal arrangement, and then guarantee display device luminance's homogeneity.
Description
[ technical field ] A method for producing a semiconductor device
The application relates to the technical field of display, in particular to a backlight module and a display device.
[ background of the invention ]
Since the lcd has many advantages of lightness, thinness, energy saving, etc., in daily life, the lcd is widely used in electronic devices such as high definition digital televisions, computers, mobile phones, digital cameras, etc.
The backlight module is an important component of the liquid crystal display. In the prior art, the metal frame of the backlight module usually includes an opening therein. In the stability test process of the backlight module, other parts in the backlight module are easy to deform and bulge at the opening of the metal frame, and the normal light emitting of the liquid crystal display is influenced.
[ application contents ]
In view of the above, embodiments of the present application provide a backlight module and a display device to solve the above problems.
In a first aspect, an embodiment of the present application provides a backlight module, where the backlight module includes a lamp strip, a metal frame, and a first circuit board, where the lamp 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 partially overlapped with the lamp strip 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 partial area of the opening along the thickness direction of the backlight module.
In one implementation manner of the first aspect, the backlight module further includes a light guide plate, and the light guide plate is connected to the flexible circuit board; and the light guide plate is positioned on one side of the flexible circuit board far away from the opening.
In one implementation manner of the first aspect, the flexible circuit board includes a first region and a second region, the light emitting device is located on 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.
In one implementation manner of the first aspect, in the thickness direction of the backlight module, a portion of the first region overlapping the opening is a first portion, and a portion of the second region overlapping the opening is a second portion; the length of the first portion in the first direction is L1, and the length of the second portion in the first direction is L2; the first direction intersects with the direction of the opening pointing to the tongue piece; wherein L2 is less than L1.
In one implementation of the first aspect, the male formation is located in the opening.
In one implementation manner of the first aspect, the convex structure covers at least 90% of the area of the opening in the thickness direction of the backlight module.
In one implementation manner of the first aspect, the first circuit board includes components and signal lines, and the components and the signal lines are not overlapped with the convex structure along a thickness direction of the first circuit board.
In one implementation of the first aspect, the shape of the opening is the same as the shape of the convex structure.
In one implementation of the first aspect, the shape of the opening is one of rectangular, trapezoidal, and semicircular.
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 one side of the backlight module close to a light emitting surface of the display device.
In one implementation manner 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. But because the shielding of metal frame, can avoid flexible circuit board to take place the uplift deformation for flexible circuit board keeps stable. However, due to the existence of the opening, the part of the flexible circuit board exposed in the opening is subjected to bulging deformation, so that the position of the light-emitting device connected with the flexible circuit board exposed in the opening is changed, and the light-emitting brightness of the part of the lamp strip exposed in the opening is different from that of the other parts, and the normal light emission of the display device is affected.
In this application, when backlight unit received cold and hot environmental change, the convex structure in the first circuit board covers open-ended at least subregion, can play the effect of sheltering from of similar metal frame, effectively avoids the uplift of the part that the lamp area is exposed by the opening to guarantee this part luminescent device's normal arrangement, and then guarantee the homogeneity of display device luminous luminance.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of a backlight module in the prior art;
fig. 2 is a cross-sectional view taken along line a-a' of fig. 1. (ii) a
FIG. 3 is a schematic diagram of deformation before and after a stability test of the backlight module;
fig. 4 is a schematic view of a backlight module according to an embodiment of the present disclosure;
fig. 5 is a schematic view of a light strip provided in an embodiment of the present application;
fig. 6 is an assembly diagram of a backlight module according to an embodiment of the present disclosure;
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' of 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 partial structure view of a backlight module according to an embodiment of the present disclosure;
fig. 11 is an exploded view of a backlight module according to an embodiment of the disclosure;
FIG. 12 is an enlarged view of the open area of FIG. 11;
fig. 13 is an exploded view of another backlight module according to an embodiment of the present disclosure;
fig. 14 is an exploded view of another backlight module according to an embodiment of the disclosure;
fig. 15 is a partial schematic view of a backlight module according to an embodiment of the disclosure;
fig. 16 is a schematic diagram of a first circuit board according to an embodiment of the present disclosure;
fig. 17 is a schematic diagram of a first circuit board according to an embodiment of the present disclosure;
fig. 18 is a schematic view of a display device according to an embodiment of the present application.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.
It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of 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 type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In the description herein, it is to be understood that the terms "substantially", "approximately", "about", "substantially", and the like, as used in the claims and the examples herein, are intended to be generally accepted as not being precise, within the scope of reasonable process operation or tolerance.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe portions, regions, etc., these portions, regions, etc. should not be limited by these terms. These terms are only used to distinguish one element, region, etc. 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 provides a solution to the problems of the prior art through intensive research.
Fig. 1 is a schematic view of a backlight module in the prior art, and fig. 2 is a cross-sectional view taken along a line a-a' in fig. 1.
In the prior art, as shown in fig. 1 and 2, a backlight module 001 ' includes a light strip 01 ', a metal frame 02 ' and a printed circuit board 03 ', and the printed circuit board 03 ' is used for transmitting a control signal and is fixed to the metal frame 02 ' of the backlight module 001 '. The common fixing method of the printed circuit board 03' includes two methods: one is to stick a heat conducting adhesive tape between the printed circuit board 03 'and the metal frame 02', and stick the printed circuit board 03 'on the back of the metal frame 02'; the other method is to lock the printed circuit board 03 'and the metal frame 02' by screws. The screw locking is adopted, so that the connecting structure has the advantages of reliable connection, simple assembly and good shock resistance, the use of materials can be obviously saved, and the function of quickly mounting or dismounting the printed circuit board 03' is realized. Meanwhile, compared with the high cost of the heat-conducting adhesive tape and the increase of the thickness of the module, the cost of the screw locking is obviously lower.
In the prior art, to save cost, the tongue piece 21 'is usually formed by directly punching 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 with the metal frame 02'. However, since the tongue 21 'is formed by directly stamping the metal frame 02', the tongue 21 'is bent away from the light strip 01' to leave an opening 22 'in the metal frame 02'. Such that the opening 22 ' overlaps at least partially with the light strip 01 ' in a thickness direction of the backlight module 001 ', that is, at least a portion of the light strip 01 ' is exposed by the opening 22 '.
With continued reference to fig. 2, it will be appreciated that the light strip 01' may also include a light emitting device. Along the thickness direction of the display device, the backlight module 001' further includes a reflective sheet, a light guide plate, a lower diffusion sheet, a lower brightness enhancement sheet, an upper diffusion sheet, and the like, which are stacked. In addition, a display panel including a lower polarizer, a driving layer, a color resist layer, an upper polarizer and an integrated circuit board IC 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 cement.
FIG. 3 is a schematic diagram of deformation before and after a stability test of the backlight module.
As shown in fig. 3, the light strip 01 ' comprises a light emitting device 11 ' and a flexible circuit board 12 '. The inventor finds that, in the process of performing the stability test on the backlight module 001 ', the portion of the lamp strip 01 ' located in the opening 22 ' deforms and bulges, which affects the normal light emission of the display device.
For example, when the backlight module 001 'is subjected to a cold and heat shock test, the backlight module 001' is placed in a high and low temperature test chamber at-20 ℃ for 30 minutes, and then the temperature of the high and low temperature test chamber is adjusted to 65 ℃ and maintained for 30 minutes. After 100 cycles, the backlight module 001 ' is taken out of the testing box, and the portion of the light strip 01 ' located in the opening 22 ' is obviously raised and deformed. The backlight module 001 'with the raised deformation is used in a display device, and the display device has obvious uneven light emission at the position corresponding to the opening 22', which affects the normal light emission of the display device.
The applicant of the present invention has made intensive studies to solve the problems of the prior art and provides a solution.
Fig. 4 is a schematic view of a backlight module provided in an embodiment of the present application, fig. 5 is a schematic view of a light strip provided in an embodiment of the present application, fig. 6 is an assembly schematic view of a backlight module provided in an embodiment of the present application, and fig. 7 is a cross-sectional view taken 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 for facilitating understanding of the technical solution of the present application, fig. 7 illustrates not only a cross-sectional view of the backlight module 001, but also a cross-sectional view of the display panel 002 disposed corresponding to the backlight module 001. Further, fig. 7 only schematically shows the structure of the backlight module 001, and the backlight module 001 may also be another structure adopting the inventive concept of the present application; correspondingly, fig. 7 only schematically shows the structure of the display panel 002, and the display panel 002 may have another structure.
Referring to fig. 4 to 7, an embodiment of the present disclosure provides a backlight module 001, including 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 21 and an opening 22, and the opening 22 at least partially overlaps the light strip 01 along the thickness direction of the backlight module 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 21, and the first circuit board 02 may be disposed on a back side of the tongue 21 facing the back of the metal frame 02, and the two are fixed in contact with each other. The first circuit board 03 includes a convex structure 31, and the convex structure 31 covers at least a partial region of the opening 22 in a thickness direction of the backlight module 001. Alternatively, the convex structure 31 may cover a partial area of the opening 22; alternatively, the male formations 31 may also completely cover the opening 22. It can be understood that, along the thickness direction of the backlight module 001, the convex structures 31 at least partially overlap the openings 22 and the light strips 01, and the light strips 01 and the convex structures 31 are respectively disposed on two opposite sides of the metal frame 02.
Assembling the backlight module 001 as shown in fig. 6, stamping a tongue piece 21 on the metal frame 02, and after forming a hole on the tongue piece 21, installing the metal frame 02 outside the internal structure (such as the lamp strip 01) of the backlight module 001; then preparing a first circuit board 03 including the bump structures 31, and opening holes in the first circuit board 03; the first circuit board 03 is aligned with the tongue 21 so that the convex structure 31 covers at least a partial region of the opening 22, and the first circuit board 03 is screwed to the tongue 21, thereby reliably fixing the first circuit board 03 to the metal frame 02.
The substrate of the flexible circuit board 12 in the lamp strip 01 is a flexible material, and when the backlight module 001 is changed by a cold and hot environment, the flexible circuit board 12 is easy to deform. Because the metal frame 02 shields part of the position of the flexible circuit board 12, the flexible circuit board 12 can be prevented from bulging and deforming to the back of the metal frame 02, and the flexible circuit board 12 is kept stable.
In the prior art, due to the opening 22, the portion of the flexible circuit board 12 exposed in the opening 22 is subjected to bulging deformation, so that the position of the light emitting device 11 connected to the flexible circuit board 12 exposed in the opening 22 is changed. Further, the portion of the light strip 01 exposed by the opening 22 has different brightness from the portions at other positions, which affects the normal lighting of the display device.
In this application, when backlight unit 001 received cold and hot environmental change, the convex structure 31 in the first circuit board 03 covers opening 22's at least part region, can play similar metal frame 02's the effect of sheltering from, effectively avoids lamp area 01 to be by the partly uplift that opening 22 exposes to guarantee this part emitting device 11's normal arrangement, and then guarantee the homogeneity of display device luminance.
Fig. 8 is a further cross-sectional view taken along line a-a' of 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 for facilitating understanding of the technical solution of the present application, fig. 8 illustrates not only a cross-sectional view of the backlight module 001, but also a cross-sectional view of the display panel 002 disposed corresponding to the backlight module 001. Further, fig. 8 only schematically shows the structure of the backlight module 001, and the backlight module 001 may also be another structure adopting the inventive concept of the present application; correspondingly, fig. 8 only schematically shows the structure of the display panel 002, and the display panel 002 may have another structure.
In one implementation of the present embodiment, as shown in fig. 8, in the thickness direction of the backlight module 001, the convex structures 31 cover at least a partial region of the openings 22, but the convex structures 31 are not located in the openings 22. It will be appreciated that the convex 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, it is ensured that the flexible circuit board 12 does not bulge to a large extent, and the flexible circuit board 12 does not drive the arrangement of the light emitting devices 11 to change obviously, so that the normal light emission of the display device is prevented from being influenced.
In another implementation manner of the embodiment, as shown in fig. 7, in the thickness direction of the backlight module 001, the convex structure 31 covers at least a partial region of the opening 22, and the convex structure 31 is located in the opening 22. It will be appreciated that the male formations 31 fill the openings 22 to some extent. In this implementation manner, it is beneficial to fully exert the shielding effect of the convex structure 31, and avoid the part of the flexible circuit board 12 located in the opening 22 from bulging, so as to ensure the arrangement of the part of the light emitting devices 11, and further ensure that the normal light emission of the display device is affected.
Fig. 9 is a schematic diagram of deformation of a backlight module according to the present application.
In an embodiment of the present application, as shown in fig. 7, the backlight module 001 further includes a light guide plate 04, 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 on a side of the flexible circuit board 12 away from the opening 22. Note that the light guide plate 04 is not connected to the light emitting devices 11 in the light strip 01. The light emitting device 11 may be positioned at a side of the light guide plate 04. The light guide plate 04 may be connected to the flexible circuit board 12 through a lamp glue M.
The light guide plate 04 is easily shrunk and deformed at low temperature, and as shown in fig. 9, when the backlight module 001 is affected by low temperature environment, the light guide plate 04 is shrunk and deformed. Since the light guide plate 04 is connected to the flexible printed circuit board 12, the light guide plate 04 drives the flexible printed circuit board 12 to deform. It is understood that, since the light guide plate 04 is deformed by shrinkage, the portion to which the flexible circuit board 12 is connected is deformed by swelling. However, due to the shielding of the metal frame 02, the most part of the flexible circuit board 12 is prevented from being raised, so that the flexible circuit board 12 is kept stable. However, due to the existence of the opening 22, the portion of the flexible circuit board 12 exposed by the opening 22 is subjected to bulging deformation, 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 has different light emitting brightness from the portions at other positions, which affects the normal light emission of the display device.
In this application, receive low temperature environment influence when backlight unit 001, when light guide plate 04 takes place the shrink deformation, the convex structure 31 in the first circuit board 03 covers opening 22's at least part region, can play similar metal frame 02's the effect of sheltering from, effectively avoids the portion's that lamp area 01 is exposed by opening 22 uplift to guarantee this part emitting device 11 normally arrange, and then guarantee the homogeneity of display device luminance.
Fig. 10 is a schematic partial structure view of a backlight module according to an embodiment of the present disclosure.
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 away from the opening 22 and is fixedly connected to the first region 12A of the flexible circuit board 12. The light guide plate 04 is fixedly connected to 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 integrated. The light guide plate 04 may be connected to the second region 12B of the flexible circuit board 12 by the 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 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 a 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 be raised. Thereby bringing the first region 12A of the flexible circuit board 12 to bump. It will be appreciated that the degree of bulging of the second region 12B is greater than the degree of bulging of the first region 12A. And since the light emitting device 11 is fixedly connected with the first region 12A of the flexible circuit board 12, the first region 12A of the flexible circuit board 12 is raised, so that the position of the light emitting device 11 is changed. The flexible circuit board 12 shielded by the metal frame 02 is not raised, thereby ensuring that the light emitting device 11 connected with the flexible circuit board 12 shielded by the metal frame 02 is not changed in position. However, due to the existence of the opening 22, the portion of the flexible circuit board 12 exposed by the opening 22 is subjected to bulging deformation, 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 has different light emitting brightness from the portions at other positions, which affects the normal light emission of the display device.
Fig. 11 is an exploded view of a backlight module according to an embodiment of the disclosure, and fig. 12 is an enlarged view of an opening area in fig. 11.
Referring to fig. 10, fig. 11 and fig. 12, in an 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 region 12A overlaps the opening 22 is a first portion 121, and a portion of the flexible circuit board 12 where the second region 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 of the opening 22 pointing towards the tongue 21 is a second direction X, the first direction Y intersecting the second direction X. It is understood that the first portion 121 is a portion of the first region 12A of the flexible circuit board 12 exposed in the opening 22, and the second portion 122 is a 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 a portion where the flexible circuit board 12 overlaps the opening 22, a length of a portion where the flexible circuit board 12 is connected to the light emitting device 11 is greater than a length of a 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, a length of a portion of the flexible circuit board 12 connected to the light emitting device 11 exposed by the opening 22 is greater than a length of a portion of the flexible circuit board 12 connected to the light guide plate 04 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 thereto to be deformed by swelling, and further, in the portion of the flexible circuit board 12 exposed by the opening 22, the flexible circuit board 12 connected to the light guide plate 04 drives the flexible circuit board 12 connected to the light emitting device 11. By designing the length of the opening 22 corresponding to the second region 12B of the flexible circuit board 12 to be shorter, the area of the portion of the flexible circuit board 12 shielded by the metal frame 02 is increased, the risk of bulging thereof is reduced, and the risk of overall bulging of the portion of the flexible circuit board 12 exposed by the opening 22 is reduced.
Referring to fig. 4, in an embodiment of the present application, the convex structures 31 cover 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 formations 31 is parallel to the direction of the tongue 21 towards the opening 22, the male formations 31 primarily covering the portion of the opening 22 adjacent the tongue 21 and the portion of the opening adjacent the intermediate position.
In this embodiment of the application, the convex structure 31 can play the effect of sheltering from, effectively avoids the lamp area 01 to be located the partial uplift in opening 22 to avoid influencing this partial emitting device 11 arrange, and then avoid influencing display device's normal luminousness. 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 with the opening 22 is reduced. Especially, when the convex structure 31 is located in the opening 22, the alignment difficulty between the convex structure 31 and the opening 22 is reduced, which is beneficial to reducing the preparation difficulty of the convex structure 31 and improving the yield of the product.
Fig. 13 is an exploded view of another backlight module according to an embodiment of the disclosure, and fig. 14 is an exploded view of another backlight module according to an embodiment of the disclosure.
In one embodiment of the present application, the shape of the opening 22 is the same as the shape of the convex structure 31. For example, as shown in fig. 4, the shape of the opening 22 and the shape of the convex structure 31 are both rectangular, or as shown in fig. 13, the shape of the opening 22 and the shape of the convex structure 31 are both trapezoidal.
It will be appreciated that the shape of the opening 22 is the same as the shape of the convex structure 31, which is advantageous for the shape of the convex structure 31 to be as similar as possible to the shape of the light strip 01 exposed by the opening 22, thereby providing effective support for the light strip 01. When backlight unit 001 receives cold and hot environment to influence, effectively avoid lamp area 01 to be by the partial uplift that opening 22 exposes to guarantee the normal arrangement of the luminescent device 11 that includes in this part lamp area 01, and then avoid influencing display device's normal luminousness.
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 partial schematic view of a backlight module according to an embodiment of the disclosure.
In an embodiment of the present application, please refer to fig. 4, 13 and 15, the shape of the opening 22 may be one of a rectangle, a trapezoid and a semicircle. 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, as shown in fig. 4, the shape of the opening 22 is rectangular, and in this case, 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, in which case the shape of the convex structure 31 is rectangular.
In the present embodiment, the shape of the convex structure 31 and the opening 22 may be the same, for example, when the shape of the opening 22 is rectangular, the shape of the convex structure 31 may be rectangular.
The shape of the convex 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 convex structure 31 may be trapezoidal.
It should be noted that the convex structure 31 may be located in the opening 22 or on the side of the opening 22 away from the light emitting surface of the display device, regardless of whether the shape of the opening 22 is the same as the shape of the convex structure 31.
Fig. 16 is a schematic diagram of a first circuit board according to an embodiment of the present disclosure, and fig. 17 is a schematic diagram of another first circuit board according to an embodiment of the present disclosure.
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 are not overlapped with the convex structure 31 in 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 understood that the first circuit board 03 is fixedly connected to the tongue 21, so that the first circuit board 03 is locked to the metal frame 02. The first circuit board 03 can be stably mounted and the mounting operation of the first circuit board 03 is facilitated. It should be noted that the first circuit board 03 may be connected to the tongue 21 by screws.
Since the convex structure 31 in the first circuit board 03 covers at least a partial region 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. That is, the first circuit board 03 may be disposed on the whole surface, and the plane of the first circuit board 03 is 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 on two different planes. For example, the first circuit board 03 includes the bent portion 3A in a plane intersecting with a plane in which the convex structure 31 is located.
In the present application, along the thickness direction of the first circuit board 03, the component 32 and the signal line 33 are not overlapped with the convex structure 31, so that the design difficulty of the first circuit board 03 is not increased. In terms of process, the convex structure 31 may be integrally formed with the substrate of the first circuit board 03. At least partial region of the opening 22 is shielded by the convex structure 31, and the flexible circuit board 12 is prevented from bulging, and meanwhile, the design difficulty of the first circuit board 03 is not additionally increased, which is beneficial to the preparation and installation of the first circuit board 03.
Fig. 18 is a schematic view of a display device according to an embodiment of the present application.
As shown in fig. 18, an embodiment of the present application provides a display device 100, and the display device 100 includes the backlight module 001 provided in any one of the embodiments. The display device 100 provided in the embodiment of the present 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, and the display panel 002 is disposed on a side of the backlight module 001 close to the light emitting surface of the display device 100. Among them, the display panel 002 may be a liquid crystal display panel.
It can be understood that when the display device 100 is subjected to a cold or hot environment, the flexible circuit board 12 in the backlight module 001 included therein is prone to generate a bump deformation. Due to the shielding of the metal frame 02, the flexible circuit board 12 can be prevented from bulging and deforming, so that the flexible circuit board 12 is kept stable. However, due to the opening 22, the portion of the flexible circuit board 12 exposed in the opening 22 is subjected to bulging deformation, 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 has different light emitting brightness from the portions at other positions, which affects the normal light emission of the display device 100.
In this application, when display device 100 receives cold and hot environment impact, the convex structure 31 in the first circuit board 03 covers at least partial region of opening 22, can play the effect of sheltering from of similar metal frame 02, effectively avoids the lamp area 01 to be located the partial uplift in opening 22 to avoid influencing this partial emitting device 11 arrange, and then avoid influencing display device 100's normal luminescence.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (11)
1. A backlight module, comprising:
a light strip comprising 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 partially overlapped with the lamp strip 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 partial 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, which is far 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 disposed on a side of the flexible circuit board away from the opening and is fixedly connected to the first region of the flexible circuit board, and the light guide plate is fixedly connected to the second region of the flexible circuit board.
4. A backlight module according to claim 3, wherein along the thickness direction of the backlight module, the portion of the first region overlapping the opening is a first portion, the portion of the second region overlapping the opening is a second portion, the length of the first portion along the first direction is L1, and the length of the second portion along the first direction is L2; the first direction intersects a direction in which the opening is directed toward the tongue;
wherein L2 is less than L1.
5. A backlight module according to claim 1, wherein the convex structures are located in the openings.
6. A backlight module according to claim 1, wherein the convex structures cover at least 90% of the area of the opening in the thickness direction of the backlight module.
7. The backlight module as claimed in claim 1, wherein the first circuit board comprises components and signal lines, and the components and the signal lines are non-overlapped with the convex structures along a thickness direction of the first circuit board.
8. A backlight module according to claim 1, wherein the opening has the same shape as the convex structure.
9. The backlight module as claimed in claim 1, wherein the opening has a shape of one of a rectangle, a trapezoid and a semicircle.
10. A display device, comprising the backlight module and the display panel as claimed in any one of claims 1 to 9; the display panel is positioned on one side of the backlight module, which is close to the light emitting surface of the display device.
11. The display device according to claim 10, wherein the display panel is a liquid crystal display panel.
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