CN112015006B

CN112015006B - Bendable backlight module and display panel

Info

Publication number: CN112015006B
Application number: CN202010958507.3A
Authority: CN
Inventors: 杨勇
Original assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2022-07-12
Anticipated expiration: 2040-09-14
Also published as: CN112015006A

Abstract

The application provides a backlight unit can buckle includes: a first non-bent portion including a first backlight unit including a first light emitting diode lamp; a second non-bent portion including a second backlight unit including a second light emitting diode lamp; the bendable part is arranged between the first non-bending part and the second non-bending part and comprises a third backlight unit, the third backlight unit comprises a plurality of micro light-emitting diodes and a flexible substrate, and the micro light-emitting diodes are arranged on the flexible substrate.

Description

Bendable backlight module and display panel

Technical Field

The application relates to the technical field of display panels, in particular to a bendable backlight module and a display panel.

Background

The flexible screen has the technical advantages of being flexible and good in flexibility, and therefore is favored by a plurality of display terminal factories including mobile phones, pen phones and the like. In the case of a backlight of a liquid crystal display panel (LCD), it is difficult for the conventional liquid crystal display panel to achieve a good bending performance due to the limitation of the backlight and the like. Conventional side income formula is shaded because design factors such as light guide plate thickness and light guide network point can't realize buckling by a wide margin, and conventional straight following formula is shaded because thickness is thicker, also can't realize buckling and apply, and conventional straight following formula backlight lamp pearl size is great simultaneously, and the technique of buckling to welding lamp pearl by a wide margin also can cause great challenge, consequently adopts conventional mode preparation liquid crystal display panel's backlight unit's scheme feasibility lower.

Disclosure of Invention

The embodiment of the application provides a bendable backlight module combining conventional backlight and miniature light-emitting diode backlight, so that the problem that the conventional backlight module cannot be bent is solved, the backlight module can have good bending performance, and the good bending performance of a display panel is realized.

The application provides a backlight unit can buckle includes:

a first non-bent portion including a first backlight unit including a first light emitting diode lamp;

a second non-bent portion including a second backlight unit including a second light emitting diode lamp;

the bendable portion is arranged between the first non-bending portion and the second non-bending portion and comprises a third backlight unit, the third backlight unit comprises a plurality of micro light-emitting diodes and a flexible substrate, and the micro light-emitting diodes are arranged on the flexible substrate.

In the bendable backlight module, the third backlight unit comprises a microstructure diffusion film arranged on the miniature light emitting diode, the microstructure diffusion film comprises a substrate, a first microstructure layer and a second microstructure layer, and the first microstructure layer and the second microstructure layer are respectively located on two sides of the substrate.

In the bendable backlight module, the first microstructure layer comprises a plurality of semi-transparent reflection blocks which are located on the substrate and far away from one side of the micro light-emitting diode, and the second microstructure layer comprises a plurality of depressions or/and a plurality of bulges which are located on the substrate and close to one side of the micro light-emitting diode.

In the bendable backlight module, the transflective block is perpendicular to the orthographic projection of the flexible substrate and covers the orthographic projection of the micro light emitting diode perpendicular to the flexible substrate.

The bendable backlight module further comprises a diffusion sheet, the first backlight unit further comprises a first light guide plate, the second backlight unit further comprises a second light guide plate, and the diffusion sheet is arranged on the first light guide plate, the second light guide plate and the micro light emitting diodes.

In the bendable backlight module of the present application, the diffusion sheet includes diffusion particles, and the concentration of the diffusion particles in a portion of the diffusion sheet corresponding to a junction of the first backlight unit and the third backlight unit and a portion of the diffusion sheet corresponding to a junction of the second backlight unit and the third backlight unit is greater than the concentration of the diffusion particles in a portion of the diffusion sheet corresponding to a central portion of the third backlight unit.

In the bendable backlight module of the present application, a concentration of the diffusion particles at a portion of the diffusion sheet corresponding to the center portion of the third backlight unit is greater than a concentration of the diffusion particles at portions of the diffusion sheet corresponding to the center portions of the first and second backlight units.

In the bendable backlight module of the present application, the first backlight unit further includes a first back frame, the first back frame is located under the first light guide plate, and a first extending portion is disposed at one end of the first back frame close to the third backlight;

the second backlight unit further comprises a second back frame, the second back frame is positioned below the second light guide plate, and a second extending part is arranged at one end, close to the third backlight, of the second back frame;

wherein the third backlight unit portion is positioned on the first extension portion and the second extension portion.

In the bendable backlight module of the present application, the first backlight unit and the second backlight unit are side-in type backlight units, and the plurality of led lamps are disposed on side end surfaces of the first light guide plate and the second light guide plate.

The application also provides a display panel, the display panel comprises any one of the bendable backlight module.

The beneficial effect of this application does: the bendable backlight module is manufactured by combining the conventional backlight and the micro light-emitting diode backlight, so that the problem that the conventional backlight module cannot be bent is solved, the backlight module has good bending performance, and the good bending performance of the display panel is realized.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic cross-sectional view illustrating a bendable backlight module according to an embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view of a microstructured diffusion film according to an embodiment of the present disclosure;

FIG. 3 is a schematic top view of a microstructured diffusion film according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram illustrating a top view structure of a diffusion sheet according to an embodiment of the present disclosure;

fig. 5 is a schematic view of a display panel according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be apparent that the described embodiments 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.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1 to 4, an embodiment of the present disclosure provides a bendable backlight module 100, where the bendable backlight module 100 includes a first non-bending portion DD, a second non-bending portion EE, and a bendable portion FF. The first non-bent portion DD includes a first backlight unit 10, the first backlight unit 10 including a first light emitting diode lamp 11; the second non-bent portion EE includes a second backlight unit 20, and the second backlight unit 20 includes a second light emitting diode lamp 21; the bendable portion FF is disposed between the first non-bending portion DD and the second non-bending portion EE, the bendable portion FF includes a third backlight unit 30, the third backlight unit 30 includes a plurality of micro light emitting diodes 32 and a flexible substrate 31, and the micro light emitting diodes 32 are disposed on the flexible substrate 31.

In some embodiments, the first and second light

emitting diode lamps

11, 21 are larger in size than the micro light emitting diodes 32, for example, the first and second light

emitting diode lamps

11, 21 are LED lamps and the micro light emitting diodes 32 are mini-LEDs. In some embodiments, the flexible substrate 31 may include one of polyimide, polymethylmethacrylate, polycarbonate, polystyrene, acryl-based resin, and the like. In some embodiments, a plurality of micro-leds 32 are arranged in an array on a flexible substrate 31. In some embodiments, the thickness of the flexible substrate 31 may be set within 30 μm. Since the third backlight unit 30 employs the flexible substrate 31, the bendable backlight module 10 can have a good bending performance at the third backlight unit 30.

In some embodiments, please refer to fig. 1 to fig. 3, in which fig. 1 illustrates a cross-sectional structure diagram of a foldable backlight module 100, fig. 2 is a cross-sectional structure diagram of the microstructure diffusion film 33 in fig. 1, and fig. 3 is a top view structure diagram of the microstructure diffusion film 33 in fig. 1. The third backlight unit 30 includes a microstructure diffusion film 33 disposed on the micro light emitting diode 32, the microstructure diffusion film 33 includes a substrate 331, a first microstructure layer 332, and a second microstructure layer 333, and the first microstructure layer 332 and the second microstructure layer 333 are respectively disposed on two sides of the substrate 331. The microstructure diffusion film 33 mainly functions to shield the lamp image of the micro led 32 and to diffuse the uniform light.

In some embodiments, the first micro-structure layer 332 includes a plurality of transflective pieces 3321 on a side of the substrate away from the micro light emitting diodes 32, and the second micro-structure layer 333 includes a plurality of recesses or/and a plurality of protrusions 3331 on a side of the substrate 331 near the micro light emitting diodes 32.

In some embodiments, an orthogonal projection of the transflective block 3321 of the first microstructure layer 332 perpendicular to the flexible substrate 31 covers an orthogonal projection of the micro light emitting diodes 32 perpendicular to the flexible substrate 31.

In some embodiments, the length of the recesses or/and protrusions 3331 of the second microstructure layer 333 is less than the length of the transflective block 3321 of the first microstructure layer 332.

In some embodiments, the microstructure diffusion film 33 is mainly composed of a substrate 331, and a first microstructure layer 332 and a second microstructure layer 333 processed on both sides of the substrate 331. The thickness of the substrate 331 may be within 50 μm, the thickness of the second microstructure layer 333 may be within 10 μm, the thickness of the first microstructure layer 332 may be within 20 μm, and the total thickness of the microstructured diffusion film 33 may be as thin as 80 μm. The second microstructure layer 333 is a micro-scale microstructure, and mainly functions to diffuse light emitted from the micro-leds 32 along a specific microstructure direction, and the effect is superior to that of a conventional haze diffuser. The first microstructure layer 332 is a millimeter-scale microstructure and mainly functions to suppress light emitted from the front surface of the micro light emitting diode 32, thereby enhancing light emitted from the side surface of the micro light emitting diode 32 and achieving the effects of shielding a lamp shadow and homogenizing light. The first microstructure layer 332 corresponds to the arrangement or period of the array of the micro light emitting diodes 32 below, and the size of the first microstructure layer 332 may be 2-10 times the size of the micro light emitting diodes 32, for example, 1-5mm, and the projections of the second microstructure layer 333 on the substrate are distributed randomly between or on the projections of the first microstructure layer 332 on the substrate.

In some embodiments, the plurality of transflective blocks 3321 on the first micro-structure layer 332 are white ink, the white ink is formed into a plurality of transflective blocks 3321 by inkjet or coating, and the transflective blocks 3321 have a transmittance and a reflectance, for example, the transmittance of the transflective blocks 3321 is 10% to 20%, and the reflectance of the transflective blocks 3321 is 70% to 80%, but not limited thereto.

In some embodiments, the plurality of recesses or/and protrusions 3331 on the second microstructure layer 333 may be embossed recesses or/and protrusions, such as a plurality of recesses or/and protrusions 3331 formed on the substrate 331 by embossing, but not limited thereto, the shapes of the recesses or/and protrusions are not limited, and may be triangular, rectangular, circular, and the like, and the recesses or/and protrusions 3331 of the second microstructure layer 333 may be dotted or blocky.

In some embodiments, the bendable backlight module 100 further includes a diffusion sheet 123, the first backlight unit 10 further includes a first light guide plate 14, the second backlight unit 20 further includes a second light guide plate 24, and the diffusion sheet 123 is disposed on the first light guide plate 14, the second light guide plate 24, and the micro light emitting diodes 32. A specific diffusion sheet 123 may be disposed on the first light guide plate 14, the second light guide plate 24, and the micro-structured diffusion film 33.

In some embodiments, the diffusion sheets 123 may be an integral structure on the first backlight unit 10, the second backlight unit 20, and the third backlight unit 30, for example, one diffusion sheet 123 may simultaneously serve to shield the lamp shadow and homogenize the light in the first backlight unit 10, the second backlight unit 20, and the third backlight unit 30.

In some embodiments, referring to fig. 1 and 4, fig. 4 is a top view structural diagram of the diffusion sheet 123 in fig. 1, the diffusion sheet 123 includes diffusion particles 1231, and the concentration of the diffusion particles 1231 in a portion of the diffusion sheet 123 corresponding to a connection of the first backlight unit 10 and the third backlight unit 30 and a portion of the diffusion sheet 123 corresponding to a connection of the second backlight unit 20 and the third backlight unit 30 is greater than that of the diffusion particles 1231 in a portion of the diffusion sheet 123 corresponding to a central portion of the third backlight unit 30, so as to achieve a better shielding effect on a seam between the first backlight unit 10 and the third backlight unit 30, and to achieve a better shielding effect on a seam between the second backlight unit 20 and the third backlight unit 30.

In some embodiments, referring to fig. 1 and 4, the concentration of the diffusion particles 1231 at a portion of the diffusion sheet 123 corresponding to the central portion of the third backlight unit 30 is greater than the concentration of the diffusion particles 1231 at portions of the diffusion sheet 123 corresponding to the central portion of the first backlight unit 10 and the central portion of the second backlight unit 20. In some embodiments, the first backlight unit 10 and the second backlight unit 20 respectively include a first light guide plate 14 and a second light guide plate 24, the first light guide plate 14 and the second light guide plate 24 both have a light-homogenizing effect on the light exiting, and the third backlight unit 30 has no light guide plate, so that the concentration of the diffusion particles 1231 disposed at the central portion of the third backlight unit 30 is greater than that disposed at the central portions of the first backlight unit 10 and the second backlight unit 20, so as to achieve an effect of enhancing the light-homogenizing effect at the central portion of the third backlight unit 30.

In some embodiments, the concentration of the diffusion particles 1231 disposed at the connection portion of the first backlight unit 10 and the third backlight unit 30 and the connection portion of the second backlight unit 20 and the third backlight unit 30 is the largest, the concentration of the diffusion particles 1231 disposed at the central portion of the third backlight unit 30 is the next largest, and the concentration of the diffusion particles 1231 disposed at the central portion of the first backlight unit 10 and the second backlight unit 20 is the smallest.

In some embodiments, the diffuser 123 is a conventional diffuser coated diffuser, and the thickness can be controlled to within 50 μm. The concentration of the diffusion particles 1231 at the combined and spliced position of the first backlight unit 10 and the third backlight unit 30 corresponding to the diffusion sheet 123 is high, and the haze is more than 90%, so that a good seam shielding effect is achieved; the concentration of the diffusant in the area of the light source surface of the micro light-emitting diode 32 corresponding to the diffusion sheet 123 is slightly lower, the haze is more than 80%, and the functions of shading the lamp shadow and homogenizing light are realized; the diffusion sheet 123 has the lowest concentration of the diffusing agent in the in-plane regions of the first backlight unit 10 and the second backlight unit 20, and has a haze of 60% or more. In order to support the thin design concept of the bendable backlight module 100, the thickness of the flexible substrate 31 of the third backlight unit shown in fig. 1 may be within 30 μm, the thickness of the micro light emitting diode 32 and the protective adhesive thereof may be within 60 μm, the thickness of the diffusion sheet 123 may be within 50 μm, the thickness of the micro diffusion film 33 may be within 80 μm, and the thinnest thickness of the bendable backlight module 100 may be within 0.22 mm.

In some embodiments, the first backlight unit 10 further includes a first back frame 12, the first back frame 12 is located under the first light guide plate 14, and one end of the first back frame 12 close to the third backlight 30 is provided with a first extending portion 121; the second backlight unit 20 further includes a second back frame 22, the second back frame 22 is located under the second light guide plate 24, and a second extending portion 221 is disposed at one end of the second back frame 22 close to the third backlight 30; wherein, the third backlight unit 30 is partially positioned on the first extension 121 and the second extension 221.

In some embodiments, the flexible substrate 31 of the third backlight unit 30 is partially positioned on the first and

second extension portions

121 and 221.

In some embodiments, the first backlight unit 10 and the second backlight unit 20 are edge-type backlights, the first back frame 12 and the second back frame 22 of the backlight outer layer are rubber frames, the first back frame 12 and the second back frame 22 are slightly larger than the conventional backlight, so that two sides of the third backlight unit 30 can be adhered to the first extension portion 121 of the first back frame 12 and the second extension portion 221 of the second back frame 22 to form a support structure, and the first extension portion 121 and the second extension portion 221 support a portion of the third backlight unit 30, such as a portion supporting the flexible substrate 31 of the third backlight unit 30. The thicknesses of the first backlight unit 10 and the second backlight unit 20 may be adjusted according to the overall thickness of the third backlight unit 30, so that the gap between the third backlight unit 30 and the diffusion sheet 123 is a predetermined gap, for example, the gap between the microstructure diffusion film 33 of the third backlight unit 30 and the diffusion sheet 123 is a gap.

In some embodiments, the first and

second backlight units

10 and 20 are side-type backlight units, and the plurality of light emitting

diode lamps

11 or 21 are disposed at side end surfaces of the first and second

light guide plates

14 and 24. Specifically, the first light emitting diode lamps 11 are disposed on a side end surface of the first light guide plate 14, and the second light emitting diode lamps 21 are disposed on a side end surface of the second light guide plate 24.

In some embodiments, the first backlight unit 10 further includes a first upper prism sheet 17 and a first lower prism sheet 16, which may improve the brightness of the first backlight unit 10. In some embodiments, the second backlight unit 20 further includes a second upper prism sheet 27 and a second lower prism sheet 26, which may improve the brightness of the second backlight unit 20. Specifically, the first lower prism sheet 16 is disposed on the diffusion sheet 123, the first upper prism sheet 17 is disposed on the first lower prism sheet 16, the second lower prism sheet 26 is disposed on the diffusion sheet 123, and the second upper prism sheet 27 is disposed on the second lower prism sheet 26.

In some embodiments, the bendable backlight module 100 further includes a reflective layer, and specifically, the first backlight unit 10 includes the first reflective layer 13, and the second backlight unit 20 includes the second reflective layer 23. The third backlight unit 30 may also include a reflective layer, and specifically, the reflective layer included in the third backlight unit 30 may be disposed on a side of the micro light emitting diode 32 close to the flexible substrate 31, on a surface of the flexible substrate 31 close to the micro light emitting diode 32, or on a side of the flexible substrate 31 far from the micro light emitting diode 32.

In some embodiments, the bendable backlight module 100 may include a light-emitting side and a backlight side opposite to the light-emitting side, the light-emitting side refers to a light-emitting direction of a light source in the bendable backlight module 100, and the backlight side refers to a non-light-emitting side opposite to the light-emitting side, for example, in fig. 1, the light-emitting side is a side of the diffusion sheet 123 far away from the first back frame 12 and the second back frame 22, and the backlight side is a side of the first back frame 12 and the second back frame 22 far away from the diffusion sheet 123.

In some embodiments, referring to fig. 1, the first backlight unit 10 includes: the backlight module includes a first back frame 12, a first reflection layer 13 disposed on the first back frame 12, a first light guide plate 14 disposed on the first reflection layer 13, a diffusion sheet 123 disposed on the first light guide plate 14, a first lower prism sheet 16 disposed on the diffusion sheet 123, a first upper prism sheet 17 disposed on the first lower prism sheet 16, and a first led lamp 11 disposed on a side end surface of the first light guide plate 14. In some embodiments, the second backlight unit 20 includes: a second back frame 22, a second reflection layer 23 disposed on the second back frame 22, a second light guide plate 24 disposed on the second reflection layer 23, a diffusion sheet 123 disposed on the second light guide plate 24, a second lower prism sheet 26 disposed on the diffusion sheet 123, a second upper prism sheet 27 disposed on the second lower prism sheet 26, and a second led lamp 21 disposed on the side end surface of the second light guide plate 24. In some embodiments, the third backlight unit 30 includes: the light-emitting diode module comprises a flexible substrate 31, a micro light-emitting diode 32 arranged on the flexible substrate 31, a micro-structure diffusion film 33 arranged on the micro light-emitting diode 32, and a diffusion sheet 123 arranged on the micro-structure diffusion film 33.

Referring to fig. 5, the display panel 1000 includes any of the bendable backlight modules 100, and may further selectively include other structures or components 600 such as a protection structure and a display component.

This application is through being shaded with conventional backlight and miniature emitting diode and combine the preparation backlight unit of can buckling to solve the problem that the backlight unit of current conventional mode can not buckle, can make backlight unit have good bending performance, thereby realize display panel's good bending performance.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The above embodiments of the present application are described in detail, and specific examples are applied herein to explain the principles and implementations of the present application, and the description of the above embodiments is only used to help understand the technical solutions and their core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A bendable backlight module is characterized by comprising:

the bendable part is arranged between the first non-bending part and the second non-bending part and comprises a third backlight unit, the third backlight unit comprises a plurality of micro light-emitting diodes and a flexible substrate, and the micro light-emitting diodes are arranged on the flexible substrate; the first and second light emitting diode lamps are larger in size than the micro light emitting diode.

2. The bendable backlight module according to claim 1,

the third backlight unit comprises a microstructure diffusion film arranged on the micro light-emitting diode, the microstructure diffusion film comprises a substrate, a first microstructure layer and a second microstructure layer, and the first microstructure layer and the second microstructure layer are respectively positioned on two sides of the substrate.

3. The bendable backlight module according to claim 2, wherein the first micro-structure layer comprises a plurality of transflective blocks located on a side of the substrate away from the micro light emitting diodes, and the second micro-structure layer comprises a plurality of recesses or/and protrusions located on a side of the substrate close to the micro light emitting diodes.

4. The bendable backlight module according to claim 3,

and the orthographic projection of the semitransparent block perpendicular to the flexible substrate covers the orthographic projection of the micro light-emitting diode perpendicular to the flexible substrate.

5. The bendable backlight module according to claim 1, further comprising a diffuser, wherein the first backlight unit further comprises a first light guide plate, the second backlight unit further comprises a second light guide plate, and the diffuser is disposed on the first light guide plate, the second light guide plate and the micro light emitting diodes.

6. The bendable backlight module according to claim 5,

the diffusion sheet includes diffusion particles having a concentration greater in a portion of the diffusion sheet corresponding to a junction of the first backlight unit and the third backlight unit and a portion of the diffusion sheet corresponding to a junction of the second backlight unit and the third backlight unit than in a portion of the diffusion sheet corresponding to a center portion of the third backlight unit.

7. The bendable backlight module according to claim 6,

the concentration of the diffusion particles at a portion of the diffusion sheet corresponding to the center portion of the third backlight unit is greater than the concentration of the diffusion particles at portions of the diffusion sheet corresponding to the center portions of the first and second backlight units.

8. The bendable backlight module according to claim 1,

the first backlight unit further comprises a first back frame and a first light guide plate, the first back frame is positioned below the first light guide plate, and a first extending part is arranged at one end, close to the third backlight, of the first back frame;

the second backlight unit further comprises a second back frame and a second light guide plate, the second back frame is positioned below the second light guide plate, and a second extending part is arranged at one end, close to the third backlight, of the second back frame;

9. The bendable backlight module according to claim 1, wherein the first backlight unit further comprises a first light guide plate, and the second backlight unit further comprises a second light guide plate;

the first backlight unit and the second backlight unit are side-in type backlight units, and the plurality of light emitting diode lamps are arranged on side end faces of the first light guide plate and the second light guide plate.

10. A display panel comprising the bendable backlight module of any one of claims 1-9.