CN110928041B

CN110928041B - Backlight module and display device

Info

Publication number: CN110928041B
Application number: CN201911157402.1A
Authority: CN
Inventors: 陈星�
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2023-07-28
Anticipated expiration: 2039-11-22
Also published as: CN110928041A

Abstract

The invention discloses a backlight module and a display device, which belong to the technical field of display, wherein the backlight module comprises a shell, a plurality of light sources, a light guide plate and a diffusion sheet assembly; a flexible circuit board extending along a first direction is fixedly arranged on the surface of one side of the backboard, which is close to the light guide plate, and a plurality of light sources are positioned on one side of the flexible circuit board, which is far away from the backboard; the diffusion sheet assembly comprises a diffusion sheet, an auxiliary strip and a supporting part, wherein one section of area, opposite to the auxiliary strip in the second direction, is attached to the diffusion sheet, the other section of area is attached to the supporting part, and the supporting part is supported between the auxiliary strip and the back plate. The display device comprises a liquid crystal display panel and any backlight module which are oppositely arranged. The invention can realize a narrow frame, and the structural member is formed by the auxiliary strip attached with the supporting part for providing supporting lap joint for the shading adhesive tape, so that the lap joint attachment of the shading adhesive tape can be ensured, the problem of module light leakage is favorably improved, the difficulty of an assembly process is reduced, and the stability of the whole backlight module is favorably improved.

Description

Backlight module and display device

Technical Field

The invention relates to the technical field of display, in particular to a backlight module and a display device.

Background

With the rapid development of display technologies, liquid crystal display devices (such as liquid crystal televisions, liquid crystal displays, liquid crystal display screens, etc.) are increasingly used in production and life by virtue of low-voltage driving, a flat panel structure, large display information amount, easy colorization, long service life, no radiation, no pollution, etc. However, the liquid crystal display device is a passive display device, which cannot emit light itself, and needs to modulate external light to achieve the display purpose. Therefore, the position of the backlight in the liquid crystal display device is particularly important. The backlight module is one of key components of the liquid crystal display device, and has the main function of providing uniform and high-brightness luminophor for the liquid crystal panel, and the basic principle is that the common point or line type luminescence is converted into high-brightness and uniform-gray-scale surface luminescence, so that the liquid crystal panel can normally display images. The backlight module can be applied to liquid crystal televisions, liquid crystal display devices, digital photo frames, electronic papers, mobile phones and other display devices needing backlight.

With the development of mobile electronic product technologies such as mobile communication products and tablet computers, many mobile phone manufacturers attract consumers by using a narrow frame as a selling point, and the frame width of the module is directly related to the frame width of the electronic product. In order to conform to the development trend of the narrow frame of the mobile electronic product, the frame of the backlight module is correspondingly required to be further narrowed, so that a certain difficulty is generated in the assembly process, the unstable module structure is easily caused, and the display quality is influenced.

Therefore, the backlight module and the display device which can realize a narrow frame and also can ensure stable backlight structure, reduce the assembly difficulty of the backlight module and improve the manufacturing efficiency while ensuring the product quality are technical problems to be solved by the technicians in the field.

Disclosure of Invention

In view of this, the present invention provides a backlight module and a display device, which solve the problems of the prior art that the assembly process of the backlight module of the narrow frame display device is difficult, the module structure is unstable, and the display quality is affected.

The invention provides a backlight module, comprising: the light source comprises a shell, a plurality of light sources, a light guide plate and a diffusion sheet assembly, wherein the shell forms an accommodating space for accommodating the light sources, the light guide plate and the diffusion sheet assembly, the light sources are positioned on at least one side of the periphery of the light guide plate, the light sources extend along a first direction, and the light emitting direction of the light sources faces the light guide plate; the shell at least comprises a backboard and a side plate which are integrally formed, wherein the plane of the backboard is parallel to the light emitting surface of the backlight module, and the plane of the side plate is intersected with the plane of the backboard; a flexible circuit board extending along a first direction is fixedly arranged on the surface of one side of the backboard, which is close to the light guide plate, a plurality of light sources are positioned on one side of the flexible circuit board, which is far away from the backboard, and the light sources are electrically connected with the flexible circuit board; the diffusion sheet component comprises a diffusion sheet, an auxiliary strip and a supporting part, wherein the diffusion sheet is positioned at one side of the plurality of light sources and the light guide plate far away from the backboard; the auxiliary strip is positioned on one side of the diffusion sheet far away from the backboard, extends along the first direction, and at least covers the light source and the orthographic projection of part of the light guide plate to the backboard; one section of the area opposite to the auxiliary strip in the second direction is attached to the diffusion sheet, the other section of the area is attached to the supporting part, and the supporting part is supported between the auxiliary strip and the back plate; the second direction intersects with the first direction in the direction parallel to the light emitting surface of the backlight module.

Based on the same inventive concept, the invention also provides a display device, which comprises a liquid crystal display panel and any backlight module which are oppositely arranged.

Compared with the prior art, the backlight module and the display device provided by the invention have the advantages that at least the following effects are realized:

the backlight module of the invention fixedly arranges the flexible circuit board extending along the first direction on the surface of one side of the back plate of the backlight module close to the light guide plate, and the plurality of light sources are positioned on one side of the flexible circuit board far away from the back plate, thereby realizing the inverse grouping of backlight and being beneficial to further contraction of the frame of the backlight module, and further improving the screen occupation ratio of the display device using the backlight module. The shell comprises a back plate and a side plate which are integrally formed, the edge folding of the shell is canceled, the edge folding interference of the shell is avoided, the light source and the flexible circuit board (namely the LED light bar) which are electrically connected are conveniently assembled, the light bar is assembled in a straight up-down mode, and the risk of firefly phenomenon in the oblique inserting process is reduced. Further, the diffusion sheet assembly of the invention comprises a diffusion sheet, an auxiliary strip and a supporting part, wherein the diffusion sheet is positioned at one side of the plurality of light sources and the light guide plate far away from the back plate; one section of the area opposite to the auxiliary strip in the second direction is attached to the diffusion sheet, the other section of the area is attached to the supporting part, and the supporting part is supported between the auxiliary strip and the back plate; after the shell flanging is canceled, the structural member is formed by the auxiliary strip attached with the supporting part to provide supporting lap joint for the shading adhesive tape, so that the lap joint attachment of the shading adhesive tape can be ensured, the problem of module light leakage can be solved, the conventional straight up and down assembling mode of the lamp strip can be realized, the assembling process difficulty is reduced, and the stability of the whole backlight module can be improved.

Of course, it is not necessary for any one product to practice the invention to achieve all of the technical effects described above at the same time.

Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic plan view of a backlight module according to an embodiment of the present invention;

FIG. 2 is a schematic view of the cross-sectional structure of the view A-A' in FIG. 1;

FIG. 3 is a schematic view of another cross-sectional view of the structure of FIG. 1 in the direction A-A';

FIG. 4 is a schematic cross-sectional view of a backlight module with a back-to-back backlight structure at a light source position according to the prior art;

FIG. 5 is a diagram illustrating a process of assembling the backlight module of FIG. 4;

FIG. 6 is a diagram illustrating a process of assembling the backlight module of FIG. 4;

FIG. 7 is a schematic plan view of the diffusion sheet assembly of FIG. 1;

fig. 8 is a schematic plan view of another backlight module according to an embodiment of the invention;

FIG. 9 is a schematic plan view of the diffusion sheet assembly of FIG. 8;

FIG. 10 is a schematic view of another cross-sectional view taken along line A-A' in FIG. 1;

FIG. 11 is a schematic view of another cross-sectional view taken along line A-A' in FIG. 1;

FIG. 12 is a schematic view of another cross-sectional view taken along line A-A' in FIG. 1;

fig. 13 is a schematic plan view of another backlight module according to an embodiment of the invention;

FIG. 14 is a schematic view of a cross-sectional view taken along line B-B' in FIG. 13;

FIG. 15 is a schematic view of another cross-sectional view B-B' of FIG. 13;

fig. 16 is a schematic cross-sectional view of a backlight module according to an embodiment of the invention;

fig. 17 is a schematic plan view of a display device according to an embodiment of the present invention;

FIG. 18 is a schematic view of the cross-sectional structure C-C' of FIG. 17.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Referring to fig. 1 and 2, fig. 1 is a schematic plan view of a backlight module according to an embodiment of the invention, and fig. 2 is a schematic sectional view of A-A' in fig. 1, wherein a backlight module 000 according to the embodiment includes: the light source module 000 of the present embodiment is a side-in backlight module, and the light source module comprises a housing 10, a plurality of light sources 20 (not filled in the figure), a light guide plate 30, and a diffusion sheet assembly 40, wherein the housing 10 forms an accommodating space for accommodating the plurality of light sources 20, the light guide plate 30, and the diffusion sheet assembly 40, the plurality of light sources 20 are located at least one side of the periphery of the light guide plate 30, and the plurality of light sources 20 are arranged along a first direction X in an extending manner, and a light emitting direction of the light sources 20 faces the light guide plate 30;

the casing 10 at least comprises a backboard 101 and a side plate 102 which are integrally formed, wherein the plane of the backboard 101 is parallel to the light emitting surface E of the backlight module 000, and the plane of the side plate 102 is intersected with the plane of the backboard 101;

In the direction Z perpendicular to the light emitting surface E of the backlight module 000, a flexible circuit board 50 (not filled in the figure) extending along the first direction X is fixedly arranged on the surface of one side of the back plate 101 close to the light guide plate 30, the plurality of light sources 20 are positioned on one side of the flexible circuit board 50 far from the back plate 101, and the light sources 20 are electrically connected with the flexible circuit board 50;

the diffusion sheet assembly 40 includes a diffusion sheet 401, an auxiliary bar 402, and a supporting portion 403, wherein the diffusion sheet 401 is located at a side of the plurality of light sources 20 and the light guide plate 30 away from the back plate 101 in a direction Z perpendicular to the light emitting surface E of the backlight module 000;

in the direction Z perpendicular to the light emitting surface E of the backlight module 000, the auxiliary bar 402 is located on one side of the diffusion sheet 401 away from the back plate 101, the auxiliary bar 402 extends along the first direction X, and the front projection of the auxiliary bar 402 to the back plate 101 covers at least the front projection of the light source 20 and part of the light guide plate 30 to the back plate 101;

a first area of the auxiliary strip 402 opposite to the second direction Y is attached to the diffusion sheet 401, a second area is attached to the support portion 403, and the support portion 403 is supported between the auxiliary strip 402 and the back plate 101; the second direction Y intersects with the first direction X in a direction parallel to the light emitting surface E of the backlight module 000.

Specifically, the backlight module 000 in the present embodiment is a side-in backlight module, and the light emitted from the light source 20 of the side-in backlight module is incident into the light guide plate 30 from the side of the light guide plate 30, is mixed and converted into a surface light source, and is transmitted through the light guide plate 30 and then emitted from the front surface of the light guide plate 30. The brightness uniformity of the side-entry backlight module is mainly affected by the brightness uniformity of the incident light source 20 and the dots of the light guide plate 30, wherein the brightness uniformity of the light source 20 has the greatest effect, and the dots of the light guide plate 30 act next time, and the light source 20 of the side-entry backlight module is generally a linear light source.

The housing 10 of the backlight module 000 of the present embodiment at least includes a back plate 101 and a side plate 102 integrally formed, wherein an extending direction of the back plate 101 is parallel to the light emitting surface E of the backlight module 000, or a direction of a plane of the back plate 101 is parallel to the light emitting surface E of the backlight module 000, and the plane of the side plate 102 intersects with the plane of the back plate 101, and optionally, as shown in fig. 2, the plane of the side plate 102 is perpendicular to the plane of the back plate 101. It should be noted that, when the back plate 101 has a planar structure, the direction of the plane of the back plate 101 is parallel to the light emitting surface E of the backlight module 000; when the back plate 101 is not in a planar structure (with a concave-convex structure), the extending direction of the back plate 101 is parallel to the light emitting surface E of the backlight module 000, and in practical implementation, the extending direction may be set according to the actual structure of the back plate 101. The integrally formed housing 10 including the back plate 101 and the side plate 102 is used as a bearing housing of the backlight module 000, so that the manufacturing efficiency of the backlight module 000 can be improved, and the structural stability of the backlight module 000 can be enhanced.

Alternatively, as shown in fig. 3, fig. 3 is a schematic view of another A-A' cross-sectional structure in fig. 1, a groove 1011 may be disposed at the position of the light source 20 of the back plate 101 as a mounting position of the flexible circuit board 50 (in this case, the back plate 101 is not in a planar structure, and the extending direction of the back plate 101 is parallel to the light emitting surface E of the backlight module 000 or is substantially parallel to the light emitting surface E), so that a certain limiting effect may be achieved on the mounting of the flexible circuit board 50 and the light source 20 by the groove 1011 disposed at the position of the back plate 101, thereby avoiding the risk that the light source 20 floats, dies or breaks the flexible circuit board 50 due to impact force striking the light guide plate 30 during a drop experiment. Further optionally, a protruding structure (not shown) is disposed at the position of the recess 1011 on the side of the light guide plate 30 near the back plate 101, so that the light guide plate 30 is limited by the protruding structure on the light guide plate 30 while the flexible circuit board 50 and the light source 20 are mounted, and the risk that the light source 20 floats, dies or the flexible circuit board 50 breaks due to impact force striking the light source 20 during the drop test can be avoided.

Along with the development of display technology, the narrow frame becomes one of main development directions at present, and the whole display screen requires the frame to be narrow, so that the backlight module inside the display screen module also needs to be matched with the narrow frame. In the conventional backlight module, a flexible circuit board electrically connected to a light source is generally located above the light source (may be an LED strip) (not shown in the figure), i.e. a positive group backlight structure. Because the width of the glue position of the flexible circuit board is large, the distance from the light source to the side plate of the shell cannot be contracted, which is unfavorable for the narrow side contraction of the backlight module, thereby being unfavorable for improving the duty ratio of the mobile phone screen. Along with the narrowing of the lower frame of the backlight module, the backlight module of the front group backlight structure in the prior art cannot meet the requirement of the narrow frame, so in this embodiment, in the direction Z perpendicular to the light emitting surface E of the backlight module 000, the flexible circuit board 50 (not filled in the drawing) extending along the first direction X is fixedly disposed on the surface of one side of the back plate 101 close to the light guide plate 30, the plurality of light sources 20 are located on the side of the flexible circuit board 50 far from the back plate 101, and the light sources 20 are fixedly disposed on the surface of one side of the back plate 101 close to the light guide plate 30 of the backlight module 000, and the plurality of light sources 20 are located on the side of the flexible circuit board 50 far from the back plate 101, i.e. the back group backlight structure, and the integrally formed housing 10 including the back plate 101 and the side plate 102 is also used as the bearing housing of the backlight module 000, thereby realizing the back group of the back light, which is beneficial to further shrinkage of the frame of the backlight module 000, thereby improving the screen ratio of the display device using the backlight module 000.

As shown in fig. 4, fig. 4 is a schematic cross-sectional structure of a backlight module with a back-to-back backlight structure at a light source position in the prior art, wherein a flexible circuit board 50 'in the back-to-back backlight structure can be fixed on a back plate 101' by a double-sided tape, a diffusion sheet 401 'is located at one side of a plurality of light sources 20' and a light guide plate 30 'far away from the back plate 101', a casing 10 'further comprises a bending plate 103' integrally formed with the back plate 101 'and a side plate 102', and a plane of the bending plate 103 'is parallel to a plane of a light emitting surface E' of the backlight module; the surface of the bending plate 103' on the side away from the back plate 101' is attached to the light shielding tape 60 '. The elongated bend of the housing 10' at the end of the side plate 102' is turned to form a bent plate 103' for supporting the masking tape 60' to overlap, and the surface of the side of the bent plate 103' away from the back plate 101' is attached to the masking tape 60 '. However, when the backlight module of the inverse backlight structure is assembled with the light source 20 'and the flexible circuit board 50' (i.e., the LED light bar) which are electrically connected, the light bar will interfere with and collide with the bending plate 103 'of the housing 10 at the position of the dashed line frame in fig. 5 (as shown in fig. 5, fig. 5 is a process structure diagram of the backlight module in the assembly process of fig. 4), so that the light bar cannot be assembled in the straight up and down mode, but instead, the light bar is inserted obliquely (as shown in fig. 6, fig. 6 is a process structure diagram of the backlight module in the assembly process of fig. 4), but the oblique insertion process in fig. 6 is unstable, which easily causes the light bar to collide with the bending plate 103', and thus increases the risk of firefly phenomenon.

Therefore, in order to solve the above problems, as shown in fig. 2 and 3, the housing 10 is designed to include only the integrally formed back plate 101 and side plate 102, the edge folding of the housing 10 is omitted, the edge folding interference of the housing 10 is avoided, the light source 20 and the flexible circuit board 50 (i.e. the LED light bar) which are electrically connected are conveniently assembled in a straight-up and straight-down manner, and the risk of firefly phenomenon in the oblique insertion process is reduced. Further, the diffusion sheet assembly 40 of the present embodiment includes a diffusion sheet 401, an auxiliary bar 402, and a supporting portion 403, wherein the diffusion sheet 401 is located at a side of the plurality of light sources 20 and the light guide plate 30 away from the back plate 101; in the direction Z perpendicular to the light emitting surface E of the backlight module 000, the auxiliary strip 402 is located on one side of the diffusion sheet 401 away from the back plate 101, the auxiliary strip 402 extends along the first direction X, and the front projection of the auxiliary strip 402 to the back plate 101 covers at least the front projection of the light source 20 and part of the light guide plate 30 to the back plate 101 (as shown in fig. 2 and 3); a first area M of the auxiliary strip 402 opposite to the second direction Y is attached to the diffusion sheet 401, a second area N is attached to the support portion 403, and the support portion 403 is supported between the auxiliary strip 402 and the back plate 101; the second direction Y intersects with the first direction X in a direction parallel to the light emitting surface E of the backlight module 000. After the shell 10 is folded, the structural member is formed by the auxiliary strip 402 attached with the supporting part 403 to provide supporting lap joint for the shading adhesive tape (not shown in the figure), so that lap joint attachment of the shading adhesive tape can be ensured, the problem of module light leakage can be improved, the conventional straight up and down assembly mode of the lamp strip can be realized, the difficulty of the assembly process is reduced, and the stability is good.

It should be noted that, in order to clearly illustrate the technical solution of this embodiment, in fig. 1, the transparency is set for the filling of the light guide plate 30, the diffusion sheet 401, the auxiliary strip 402, and the supporting portion 403, and the specific stacked structure may refer to fig. 2 and 3. Alternatively, the fixing of the light guide plate 30 to the back plate 101, the fixing of the flexible circuit board 50 to the back plate 101, the fixing of the light guide plate 30 to the flexible circuit board 50, and the fixing of the flexible circuit board 50 to the light source 20 may be performed by adhesive means, such as adhesive and thinner adhesive tapes, such as black-filled double-sided tapes as shown in fig. 2 and 3. In this embodiment, the materials of the auxiliary strip 402 and the supporting portion 403 are not particularly limited, and the auxiliary strip 402 only needs to achieve the effect of supporting and overlapping the light-shielding adhesive tape, and the supporting portion 403 may achieve the effect of supporting the auxiliary strip 402 and the back plate 101, and may have slight elasticity or no elasticity.

Optionally, in this embodiment, in the direction Z perpendicular to the light emitting surface E of the backlight module 000, the auxiliary bar 402 and the side plate 102 do not overlap (as shown in fig. 2 and 3), specifically, in the direction parallel to the light emitting surface E of the backlight module 000, the end portion of the housing 10 is the side plate 102, that is, in the direction parallel to the light emitting surface E of the backlight module 000, the opening size of the housing 10 forming the accommodating space is the size of the back plate 101, so that when the light bar formed by the flexible circuit board 50 and the light source 20 that are electrically connected adopts an assembly mode of directly and directly, interference between the light bar and the housing 10 is avoided, the assembly effect is affected, which is beneficial to reducing the difficulty of the assembly process and improving the stability of the whole module. Optionally, as shown in fig. 2 and 3, the backlight module 000 may further include other optical films, where the optical films determine the performance of the entire module. For example, the light guide plate 30 may be provided with a reflective sheet 70 (not filled in the drawing) on the side close to the back plate 101, and the diffusion sheet 401 may be provided with a light enhancement sheet 80 (not filled in the drawing) on the side far from the back plate 101, so that the backlight brightness and energy efficiency can be further improved by using the reflective sheet 70 with high reflectivity. The diffusion sheet 401 generally diffuses particles by using PMMA (polymethyl methacrylate )) to cause irregular refraction of light, so as to effectively homogenize the outgoing light of the light source 20; the diffusion sheet 401 may be divided into an upper diffusion sheet and a lower diffusion sheet (not shown) according to the Haze (Haze rate) of the diffusion particles, and has a substantially uniform structure, and has an antistatic property, and the lower diffusion sheet has an anti-sticking function. The prism-shaped micro-structured light enhancement sheet 80 (also called as prism sheet or light condensing sheet) is a key component in the backlight module 000, and the light enhancement sheet 80 can make the light finally emitted by the light source 20 emit to the light emitting surface E in the direction perpendicular to the light emitting surface E of the backlight module 000. Light emitted by the light source 20 in the backlight module 000 is guided into the module through the light guide plate 30, the reflecting sheet 70 is used for reflecting the leaked light back, so that the light energy utilization rate can be effectively improved, then the light is atomized through the diffusion sheet 401 and concentrated on the light emitting surface E of the backlight module 000 through the light enhancement sheet 80, and the effect of improving the front brightness is achieved.

It should be further noted that, in the present embodiment, a section of the area M of the auxiliary strip 402 opposite to the second direction Y is attached to the diffusion sheet 401, and another section of the area N is attached to the supporting portion 403, and optionally, the manufacturing material of the auxiliary strip 402 is a rigid light shielding material, and the rigid hard material of the auxiliary strip 402 can provide better supporting lap joint for a light shielding adhesive tape (not shown in the figure), so that lap joint attachment of the light shielding adhesive tape can be ensured, and the light shielding material of the auxiliary strip 402 is beneficial to improving the module light leakage problem. In addition, the attachment of the auxiliary strip 402 to the diffusion sheet 401 may also play a role in fixing the diffusion sheet 401, if the auxiliary strip 402 is directly attached to the light enhancement sheet 80, not only the thickness of the backlight module 000 is increased, but also the fixing of the diffusion sheet 401 is not facilitated, so that the embodiment sets a section of the area M opposite to the auxiliary strip 402 in the second direction Y to be attached to the diffusion sheet 401.

In some alternative embodiments, please continue to refer to fig. 2 and 3, in this embodiment, the front projection of the diffuser 401 onto the back plate 101 covers at least the front projection of the light guide plate 30 and part of the light sources 20 onto the back plate 101.

The present embodiment further explains that, along the direction Z perpendicular to the light-emitting surface E of the backlight module 000, the orthographic projection of the diffusion sheet 401 onto the back plate 101 at least covers the orthographic projection of the light guide plate 30 and part of the light sources 20 onto the back plate 101, that is, along the direction Z perpendicular to the light-emitting surface E of the backlight module 000, the diffusion sheet 401 at least partially overlaps the light guide plate 30 and part of the light sources 20, the diffusion sheet 401 may overlap all of the light guide plate 30 and part of the light sources 20, or the diffusion sheet 401 may overlap all of the light guide plate 30 and all of the light sources 20, or the diffusion sheet 401 may overlap all of the light guide plate 30 and part of the light sources 20, and only needs to realize the diffusion effect of the diffusion sheet 401 on the light emitted by the light sources 20 and the diffusion effect on the light emitted by the light guide plate 30.

In some alternative embodiments, please refer to fig. 1-3 and fig. 7, fig. 7 is a schematic plan view of the diffusion sheet assembly in fig. 1, and in this embodiment, the supporting portion 403 is a strip structure extending along the first direction X.

The present embodiment further illustrates that the supporting portion 403 for supporting the auxiliary strip 402 and the back plate 101 may have a strip-shaped structure and be disposed to extend along the first direction X, so that all the portions between the auxiliary strip 402 and the back plate 101 in the first direction X may have a better supporting effect.

In some alternative embodiments, please refer to fig. 8 and 9, fig. 8 is a schematic plan view of another backlight module provided in the embodiment of the present invention, and fig. 9 is a schematic plan view of the diffusion sheet assembly in fig. 8, in which the supporting portion 403 includes a plurality of block structures disposed along the first direction X.

The embodiment further illustrates that the supporting portion 403 for supporting the auxiliary bar 402 and the back plate 101 may also be a plurality of block structures, and the plurality of block structures are arranged at intervals along the first direction X, and because there is a gap between two adjacent block structures, the supporting portion 403 of the plurality of block structures arranged along the first direction X has better heat dissipation performance while supporting between the auxiliary bar 402 and the back plate 101, so that the situation that the heat dissipation performance of the backlight module 000 is reduced due to the supporting portion 403 is avoided.

It should be noted that, fig. 8 and fig. 9 of the present embodiment only schematically illustrate the number of the plurality of block structures included in the supporting portion 403 and the spacing between the adjacent block structures, and in a specific implementation, the number of the plurality of block structures included in the supporting portion 403 and the spacing between the adjacent block structures along the first direction X may be set according to practical situations, and the present embodiment is not particularly limited, and only needs to satisfy that the plurality of block structures arranged at intervals along the first direction X can be supported between the auxiliary bar 402 and the back plate 101 to achieve a supporting effect.

In some alternative embodiments, please refer to fig. 1, 10 and 11, fig. 10 is a schematic view of another A-A 'cross-sectional structure in fig. 1, and fig. 11 is a schematic view of another A-A' cross-sectional structure in fig. 1, in which the supporting portion 403 includes a cross section perpendicular to the light emitting surface E of the backlight module 000; the cross-sectional shape is either a trapezoid or a right trapezoid, and the surface area of the support portion 403 on the side close to the assist bar 402 is larger than the surface area of the support portion 403 on the side away from the assist bar 402.

The embodiment further illustrates that the surface area of the supporting portion 403 near the side of the auxiliary bar 402 is larger than the surface area of the supporting portion 403 far from the side of the auxiliary bar 402, and the cross-sectional shape of the supporting portion 403 perpendicular to the light emitting surface E of the backlight module 000 is any one of trapezoid (as shown in fig. 10) or right trapezoid (as shown in fig. 11), that is, the supporting portion 403 has a structure with a large top and a small bottom in the direction Z perpendicular to the light emitting surface E of the backlight module 000, and the surface area of the supporting portion 403 near the back plate 101 is small, so that the supporting portion 403 can be more easily and accurately inserted into the gap between the side plate 102 and the light source 20 when the module is assembled, thereby improving the alignment success rate. In practical implementation, an error may exist in alignment, but because the surface area of the support portion 403 near the back plate 101 side is small, even if the deviation in alignment occurs, the end portion of the support portion 403 near the side of the auxiliary strip 402 deviates out of the gap range between the side plate 102 and the light source 20, the projection of the end portion of the support portion 403 near the side of the back plate 101 still falls into the gap range between the side plate 102 and the light source 20, so that the end portion of the support portion 403 near the side of the back plate 101 can be smoothly inserted into the gap between the side plate 102 and the light source 20, once the end portion of the support portion 403 near the side of the back plate 101 is inserted into the gap, the whole support portion 403 can be continuously and accurately guided to be placed into the gap between the side plate 102 and the light source 20, thereby reducing difficulty of assembly process and being beneficial to improving assembly accuracy of the whole module.

In addition, the surface area of the supporting portion 403 on the side close to the auxiliary strip 402 is larger than the surface area of the supporting portion 403 on the side far away from the auxiliary strip 402, that is, the surface area of the end surface of the supporting portion 403 on the side close to the auxiliary strip 402 is increased, so that the adhesion capability of the supporting portion 403 and the auxiliary strip 402 can be further improved, the grabbing force can be increased, and the falling-off of the supporting portion 403 or the auxiliary strip 402 can be avoided. The supporting portion 403 has a structure with a large top and a small bottom in a direction Z perpendicular to the light emitting surface E of the backlight module 000, that is, an end portion of the supporting portion 403 near one side of the back plate 101 is smaller, so that damage to other components of the module caused by excessive local stress of the supporting portion 403 in a space formed by the light source 20 and the side plate 102 due to alignment errors during assembly can be avoided.

In this embodiment, the surface area of the supporting portion 403 on the side close to the auxiliary bar 402 is only limited to be larger than the surface area of the supporting portion 403 on the side far from the auxiliary bar 402, and the surface area of the supporting portion 403 on the side close to the auxiliary bar 402 is not particularly limited to be larger than the surface area of the supporting portion 403 on the side far from the auxiliary bar 402, and it is only required that the surface of the supporting portion 403 on the side close to the auxiliary bar 402 and the surface of the supporting portion 403 on the side far from the auxiliary bar 402 are both flat surfaces, so that the supporting effect between the auxiliary bar 402 and the back plate 101 can be achieved.

In some alternative embodiments, please continue to refer to fig. 10-11, in this embodiment, one end of the supporting portion 403 is fixedly attached to the auxiliary strip 402, and the other end of the supporting portion 403 contacts the surface of the flexible circuit board 50 on the side away from the back plate 101. Alternatively, in the direction Z perpendicular to the light emitting surface E of the backlight module 000, the thickness D0 of the supporting portion 402 is a distance D2 between a surface of the auxiliary strip 402 on a side close to the back plate 101 and a surface of the flexible circuit board 50 on a side far from the back plate 101.

The present embodiment further illustrates that when the supporting portion 403 is supported between the auxiliary strip 402 and the back plate 101, specifically, the supporting portion 403 is supported between the auxiliary strip 402 and the flexible circuit board 50 to achieve the supporting effect, the flexible circuit board 50 needs to have enough wiring space, so that the supporting portion 403 is near the back plate 101, that is, the end of the supporting portion 403 away from the auxiliary strip 402 needs to be in contact with the surface of the flexible circuit board 50 away from the back plate 101. At this time, along the direction Z perpendicular to the light emitting surface E of the backlight module 000, the thickness D0 of the supporting portion 402 is the distance D2 between the surface of the auxiliary bar 402 on the side close to the back plate 101 and the surface of the flexible circuit board 50 on the side far from the back plate 101.

When the backlight module 000 of the present embodiment is assembled, the end of the supporting portion 403 near the auxiliary strip 402 is first fixedly attached to the auxiliary strip 402 by a double-sided tape (or other thinner glue-like structure with an adhesive effect), then the supporting portion 403 is attached to the surface of the diffusion sheet 401 away from the back plate 101 together with the auxiliary strip 402, and finally assembled into the housing 10 together, so that the surface of the supporting portion 403 near the back plate 101 contacts with the surface of the flexible circuit board 50 away from the back plate 101, that is, the supporting portion 403 is lap-jointed and supported on the surface of the flexible circuit board 50 away from the back plate 101.

In some alternative embodiments, please refer to fig. 12, fig. 12 is a schematic view of another A-A' cross-sectional structure in fig. 1, in this embodiment, one end of the supporting portion 403 is fixedly attached to the auxiliary strip 402, and the other end of the supporting portion 403 is fixedly attached to a surface of the flexible circuit board 50, which is far from the back plate 101, through a double-sided adhesive tape 4031. Optionally, in a direction Z perpendicular to the light emitting surface E of the backlight module 000, the thickness of the supporting portion 403 is D0, and d0=d2-D1, where D2 is a distance between a surface of the auxiliary bar 402 near the back plate 101 and a surface of the flexible circuit board 50 far from the back plate 101, and D1 is a thickness of the double-sided tape 4031.

The present embodiment further illustrates that when the supporting portion 403 is supported between the auxiliary strip 402 and the back plate 101, specifically, the supporting portion 403 is supported between the auxiliary strip 402 and the flexible circuit board 50 to achieve the supporting effect, the flexible circuit board 50 needs to have enough wiring space, so that the supporting portion 403 is near the back plate 101, that is, the end of the supporting portion 403 away from the auxiliary strip 402 needs to be in contact with the surface of the flexible circuit board 50 away from the back plate 101. In order to further enhance the fixing effect between the supporting portion 403 and the flexible circuit board 50, the end portion of the supporting portion 403 close to the flexible circuit board 50 in this embodiment is fixedly attached to the surface of the flexible circuit board 50 on the side far from the back plate 101 through the double faced adhesive tape 4031. At this time, along the direction Z perpendicular to the light-emitting surface E of the backlight module 000, the thickness of the supporting portion 403 is D0, and d0=d2-D1, where D2 is the distance between the surface of the auxiliary bar 402 near the back plate 101 and the surface of the flexible circuit board 50 far from the back plate 101, and D1 is the thickness of the double-sided tape 4031.

When the backlight module 000 of the embodiment is assembled, the end of the supporting portion 403 close to the auxiliary strip 402 is fixedly attached to the auxiliary strip 402 through a double sided tape (or other thinner glue structure with an adhesive effect), then the supporting portion 403 is attached to the surface of the diffusion sheet 401 away from the back plate 101 along with the auxiliary strip 402, and finally the supporting portion 403 is assembled into the housing 10, so that the surface of the supporting portion 403 close to the back plate 101 is fixedly attached to the surface of the flexible circuit board 50 away from the back plate 101 through the double sided tape 4031, and the stability of the entire backlight module 000 is further enhanced.

In some alternative embodiments, referring to fig. 13 and 14, fig. 13 is a schematic plan view of another backlight module according to an embodiment of the present invention, and fig. 14 is a schematic cross-sectional view of a B-B' direction in fig. 13, in this embodiment, a light shielding tape 60 is further disposed on a side of the auxiliary strip 402 away from the back plate 101, the light shielding tape 60 is disposed to extend along the first direction X, and at least a front projection of the light shielding tape 60 to the back plate 101 covers a front projection of the light source 20 and a portion of the light guide plate 30 to the back plate 101.

The embodiment further illustrates that the light shielding tape 60 extending along the first direction X is attached to the side of the auxiliary strip 402 away from the back plate 101, and the front projection of the light shielding tape 60 to the back plate 101 at least covers the front projection of the light source 20 and part of the light guide plate 30 to the back plate 101 along the direction Z perpendicular to the light emitting surface E of the backlight module 000, when the backlight module 000 is assembled with the display panel, the light shielding tape 60 not only can fix the substrate of the backlight module 000 and the display panel, but also can play a role of shielding light, avoiding light leakage at the position of the light source 20, and being beneficial to improving the product quality of the backlight module 000.

In fig. 13, for clarity of illustration of the technical solution of the present embodiment, the transparency of the light guide plate 30, the diffusion sheet 401, the light enhancement sheet 80, and the light shielding tape 60 are all set, and the specific stacked structure may refer to fig. 14. Alternatively, the fixing of the light guide plate 30 to the back plate 101, the fixing of the flexible circuit board 50 to the back plate 101, the fixing of the light guide plate 30 to the flexible circuit board 50, and the fixing of the flexible circuit board 50 to the light source 20 may be performed by adhesive means, such as adhesive and thinner adhesive tapes, such as black-filled double-sided tapes as shown in fig. 14.

It should be further noted that, in fig. 14, the light shielding tape 60 illustrates a gap (as shown in a dashed frame in fig. 14) at a position on one side of the diffusion sheet 401, but in practical implementation, since the brightness enhancement sheet 80 and the auxiliary strip 402 are both very thin, the thickness of the brightness enhancement sheet 80 and the thickness of the auxiliary strip 402 are almost negligible, so that the gap is practically absent, and in fig. 14, the light shielding tape 60 is actually fixedly attached to the diffusion sheet 401 at the gap, so that the light shielding tape 60 can play a role in shielding light, and simultaneously can be fixedly attached to the auxiliary strip 402, the brightness enhancement sheet 80 and the diffusion sheet 401, so that the movement of the diffusion sheet 401 and the brightness enhancement sheet 80 is avoided, and the stability of the whole backlight module 000 is facilitated to be improved.

In some alternative embodiments, referring to fig. 15, fig. 15 is a schematic view of another cross-sectional structure of fig. 13 along the B-B' direction, in this embodiment, a lower brightness enhancement sheet 801 and an upper brightness enhancement sheet 802 are further stacked on one side of the light guide plate 30 away from the back plate 101, and the front projection of the lower brightness enhancement sheet 801 and the upper brightness enhancement sheet 802 to the back plate 101 is located in the range of the front projection of the diffusion sheet 401 to the back plate 101.

Specifically, one to two light increasing sheets are required to be arranged in the general backlight module 000, and the light increasing sheets have the function of concentrating scattered light to the front surface so as to achieve the aim of improving the brightness of the front surface, recycling the light which is not utilized outside the visual angle by utilizing the reflection of the light, reducing the loss of the light and indirectly achieving the benefits of energy conservation, low carbon and environmental protection. In addition, in this embodiment, the front projection of the lower brightness enhancement film 801 and the upper brightness enhancement film 802 to the back plate 101 is located in the range of the front projection of the diffusion film 401 to the back plate 101, that is, along the second direction Y, the diffusion film 401 is generally larger than the brightness enhancement film 80 (the lower brightness enhancement film 801 and the upper brightness enhancement film 802), so that the light shielding tape 60 can be fixedly attached to both the brightness enhancement film 80 and the diffusion film 401, and the diffusion film 401 and the brightness enhancement film 80 are prevented from moving.

Note that, in fig. 15, the light shielding tape 60 illustrates a gap (as shown in a dashed frame in fig. 15) at a position on one side of the diffusion sheet 401, but in practical implementation, since the lower and upper brightness enhancement sheets 801 and 802 and the auxiliary strips 402 are all thin, the thicknesses of the lower and upper brightness enhancement sheets 801 and 802 and the thicknesses of the auxiliary strips 402 are almost negligible, the gap is practically nonexistent, and in the gap illustrated in fig. 15, the light shielding tape 60 is practically fixedly attached to the diffusion sheet 401, so that the light shielding tape 60 can exert a light shielding effect, and simultaneously can be fixedly attached to the upper brightness enhancement sheet 802, the auxiliary strips 402 and the diffusion sheet 401, so that the movement of the diffusion sheet 401 and the brightness enhancement sheet 80 is avoided, thereby being beneficial to improving the stability of the whole backlight module 000.

In some alternative embodiments, please continue with fig. 13 and 15, the thickness of the auxiliary strip 402 is D4, d4=d3 +/-0.02mm along the direction Z perpendicular to the light emitting surface E of the backlight module 000, wherein D3 is the sum of the thicknesses of the lower brightness enhancement sheet 801 and the upper brightness enhancement sheet 802.

This embodiment further illustrates that, in an ideal state, the thickness of the auxiliary strip 402 is equal to the sum of the thicknesses of the lower brightness enhancement film 801 and the upper brightness enhancement film 802, so that the surface of the side of the auxiliary strip 402 away from the back plate 101 and the surface of the side of the upper brightness enhancement film 802 away from the back plate 101 are on the same horizontal plane, and the light shielding adhesive tape 60 is more tightly attached to the auxiliary strip 402 and the upper brightness enhancement film 802. However, in actual manufacturing, due to the existence of process errors, the thickness D4 of the auxiliary stripe 402 may be equal to d3+0.02mm or D3-0.02mm, where D3 is the sum of the thicknesses of the lower brightness enhancement film 801 and the upper brightness enhancement film 802.

In some alternative embodiments, referring to fig. 16, fig. 16 is a schematic cross-sectional structure of a backlight module at a light source position according to an embodiment of the invention, in which the backlight module 000 further includes an edge-covering tape 90, and the edge-covering tape 90 is respectively attached to a side surface of the light-shielding tape 60 away from the back plate 101 and a side surface of the side plate 102 away from the accommodating space.

This embodiment further illustrates that in order to stabilize the entire backlight module 000, the backlight module 000 further includes the wrapping tape 90 attached to the surface of the side of the light shielding tape 60 away from the back plate 101 and the surface of the side plate 102 away from the accommodating space, for wrapping the entire housing 10 and the light shielding tape 60, and optionally, the wrapping tape 90 is single-sided adhesive, and the side of the light shielding tape 60 close to the housing 10 is adhesive, and the side of the light shielding tape 60 away from the housing 10 is non-adhesive, so that the situation that the product quality is affected due to the foreign matters adhered to the outer side of the wrapping tape 90 can be avoided while the entire backlight module 000 is stabilized.

In some alternative embodiments, please refer to fig. 17 and fig. 18, fig. 17 is a schematic plan view of a display device according to an embodiment of the present invention, and fig. 18 is a schematic cross-sectional view of fig. 17 along the C-C' direction, in which the display device 1111 includes a liquid crystal display panel 111 and a backlight module 000 according to any of the above embodiments. The embodiment of fig. 17 and 18 is only an example of a mobile phone, and the display device 1111 is described, it is to be understood that the display device 1111 provided in the embodiment of the present invention may be other display devices 1111 having a display function, such as a computer, a television, a vehicle-mounted display device, etc., which is not particularly limited in the present invention. The display device 1111 provided by the embodiment of the present invention has the beneficial effects of the backlight module 000 provided by the embodiment of the present invention, and the specific description of the backlight module 000 in the above embodiments may be referred to in the embodiments, which is not repeated herein.

In some alternative embodiments, please continue to refer to fig. 17 and 18, in this embodiment, a compensation tape 100 is further disposed between the backlight module 000 and the lcd panel 111, one side surface of the compensation tape 100 is adhered to the backlight module 000, and the other side surface of the compensation tape 100 is adhered to the lcd panel 111.

The embodiment further illustrates that, in order to enhance the assembling stability of the backlight module 000 and the liquid crystal display panel 111, the compensation tape 100 may be attached to the upper side of the wrapping tape 90, wherein one side surface of the compensation tape 100 is attached to the backlight module 000, and the other side surface of the compensation tape 100 is attached to the liquid crystal display panel 111. Note that, although the light shielding tape 60 in fig. 18 illustrates a gap at a position near the liquid crystal display panel 111 side, in actual implementation, since the compensation tape 100 and the taping tape 90 are thin, the thickness of both are almost negligible, and therefore the gap is practically absent, and in the gap illustrated in fig. 18, the light shielding tape 60 is practically attached to the liquid crystal display panel 111 side, so that the light shielding tape 60 can play a role of fixing the liquid crystal display panel 111 and the backlight module 000 together with the compensation tape 100 while playing a role of shielding light.

According to the embodiment, the backlight module and the display device provided by the invention have the following beneficial effects:

While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A backlight module, comprising: the light source device comprises a shell, a plurality of light sources, a light guide plate and a diffusion sheet assembly, wherein the shell forms an accommodating space for accommodating the light sources, the light guide plate and the diffusion sheet assembly, the light sources are positioned on at least one side of the periphery of the light guide plate, the light sources extend along a first direction, and the light emitting direction of the light sources faces the light guide plate;

the shell at least comprises a backboard and a side plate which are integrally formed, wherein the plane of the backboard is parallel to the light-emitting surface of the backlight module, and the plane of the side plate is intersected with the plane of the backboard;

a flexible circuit board extending along the first direction is fixedly arranged on the surface of one side of the back plate, which is close to the light guide plate, the light sources are positioned on one side of the flexible circuit board, which is far away from the back plate, and the light sources are electrically connected with the flexible circuit board;

The diffusion sheet assembly comprises a diffusion sheet, an auxiliary strip and a supporting part, wherein the diffusion sheet is positioned at one side of the plurality of light sources and the light guide plate away from the back plate;

the auxiliary strip is positioned on one side of the diffusion sheet far away from the backboard, the auxiliary strip extends along the first direction, and the orthographic projection of the auxiliary strip to the backboard at least covers the orthographic projection of the light source and part of the light guide plate to the backboard;

a section of the auxiliary strip opposite to the diffusion sheet in the second direction is attached to the diffusion sheet, and another section of the auxiliary strip is attached to the supporting part, and the supporting part is supported between the auxiliary strip and the back plate; the second direction intersects with the first direction in a direction parallel to the light emitting surface of the backlight module;

the orthographic projection of the diffusion sheet to the backboard at least covers the orthographic projection of the light guide plate and part of the light source to the backboard;

the auxiliary strip is far away from one side of the backboard, a shading adhesive tape is further arranged on the side, away from the backboard, of the auxiliary strip, the shading adhesive tape extends along the first direction, and orthographic projection of the shading adhesive tape to the backboard at least covers orthographic projection of the light source and part of the light guide plate to the backboard.

2. A backlight module according to claim 1, wherein the supporting portion is a strip-shaped structure extending along the first direction.

3. A backlight module according to claim 1, wherein the support portion comprises a plurality of block structures arranged along the first direction.

4. A backlight module according to claim 1, wherein the support portion comprises a cross section perpendicular to the light exit surface of the backlight module; the cross-sectional shape is any one of a trapezoid or a right trapezoid, and the surface area of the support portion on the side close to the auxiliary strip is larger than the surface area of the support portion on the side far away from the auxiliary strip.

5. A backlight module according to claim 1, wherein one end of the supporting portion is fixedly attached to the auxiliary bar, and the other end of the supporting portion is in contact with a surface of the flexible circuit board on a side away from the back plate.

6. A backlight module according to claim 5, wherein the thickness of the supporting portion is a distance between a surface of the auxiliary bar on a side close to the back plate and a surface of the flexible circuit board on a side far from the back plate in a direction perpendicular to the light emitting surface of the backlight module.

7. The backlight module according to claim 1, wherein one end of the supporting portion is fixedly attached to the auxiliary strip, and the other end of the supporting portion is fixedly attached to a surface of the flexible circuit board, which is far away from the back plate, through double-sided adhesive tape.

8. A backlight module according to claim 7, wherein the thickness of the supporting portion is D0 along a direction perpendicular to the light emitting surface of the backlight module, and d0=d2-D1, wherein D2 is a distance between a surface of the auxiliary bar on a side close to the back plate and a surface of the flexible circuit board on a side far from the back plate, and D1 is a thickness of the double-sided tape.

9. A backlight module according to claim 1, wherein the auxiliary strip is made of a rigid light shielding material.

10. The backlight module according to claim 1, wherein a lower light enhancement sheet and an upper light enhancement sheet are further stacked in sequence on one side of the light guide plate away from the back plate, and orthographic projections of the lower light enhancement sheet and the upper light enhancement sheet to the back plate are located in a range of orthographic projections of the diffusion sheet to the back plate.

11. A backlight module according to claim 10, wherein the thickness of the auxiliary strip is D4, d4=d3 +/-0.02mm in a direction perpendicular to the light-emitting surface of the backlight module, wherein D3 is the sum of the thicknesses of the lower and upper light-increasing sheets.

12. A backlight module according to claim 1, further comprising an edge-covering tape attached to a side surface of the light-shielding tape away from the back plate and a side surface of the side plate away from the accommodating space, respectively.

13. A display device comprising a liquid crystal display panel and a backlight module according to any one of claims 1-12 arranged in opposition.

14. The display device according to claim 13, wherein a compensation tape is further disposed between the backlight module and the liquid crystal display panel, one side surface of the compensation tape is adhered to the backlight module, and the other side surface of the compensation tape is adhered to the liquid crystal display panel.