CN113189816A

CN113189816A - Backlight module, preparation method thereof and display device

Info

Publication number: CN113189816A
Application number: CN202110577658.9A
Authority: CN
Inventors: 李健; 李沛; 翟明; 李金鹏; 张树柏; 张腾; 曹鹏军; 杨志富
Original assignee: BOE Technology Group Co Ltd; BOE Jingxin Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; BOE Jingxin Technology Co Ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2021-07-30

Abstract

The invention relates to a backlight module, a preparation method thereof and a display device. The backlight module comprises: at least two lamp panels which are adjacently arranged; the lamp panel comprises a substrate, a light-emitting element and a retaining wall structure, wherein the light-emitting element and the retaining wall structure are respectively positioned on the substrate and are positioned on the same side of the substrate; a gap is formed between the substrates of the two adjacent lamp panels; the adjusting piece is at least partially arranged in the gap; the material properties of the adjustment member are substantially the same as the material properties of the retaining wall structure. According to the embodiment of the invention, the shading of the abutted seams can be reduced or eliminated, and the display effect is improved.

Description

Backlight module, preparation method thereof and display device

Technical Field

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

Background

In the related art, a backlight module is an important component of a liquid crystal display device, and the backlight module is used for providing a sufficient and uniform surface light source for the liquid crystal display device. Generally, the backlight module includes a side-type backlight module and a direct-type backlight module, wherein the direct-type backlight module may include a plastic frame, a back plate, a light source, a diffusion plate, an optical film, and the like. Wherein, the light source is positioned below the diffusion plate. The light emitted by the light source is transmitted through the diffusion plate and irradiates the liquid crystal display panel.

Disclosure of Invention

The invention provides a backlight module, a preparation method thereof and a display device, which aim to overcome the defects in the related art.

According to a first aspect of the embodiments of the present invention, there is provided a backlight module, including: at least two lamp panels which are adjacently arranged;

the lamp panel comprises a substrate, a light-emitting element and a retaining wall structure, wherein the light-emitting element and the retaining wall structure are respectively positioned on the substrate and are positioned on the same side of the substrate; a gap is formed between the substrates of the two adjacent lamp panels;

an adjustment member at least partially disposed in the gap;

the material properties of the adjustment member are substantially the same as the material properties of the retaining wall structure.

In one embodiment, the material property comprises reflectivity;

the reflectivity of the adjusting piece is greater than or equal to 90%, and the reflectivity of the retaining wall structure is greater than or equal to 90%.

In one embodiment, when the reflectivity of the adjusting piece is greater than that of the retaining wall structure, the surface of the adjusting piece away from the substrate is a convex surface; and/or the presence of a gas in the gas,

when the reflectivity of the adjusting piece is equal to that of the retaining wall structure, the surface of the adjusting piece away from the substrate is a plane; and/or the presence of a gas in the gas,

when the reflectivity of the adjusting piece is smaller than that of the retaining wall structure, the surface of the adjusting piece far away from the substrate is a concave surface.

In one embodiment, the material properties include color, the adjustment member is white, the retaining wall structure is white,

the color coordinates of the colors of the adjusting pieces are basically the same as the color coordinates of the colors of the retaining wall structures.

In one embodiment, the material of the regulating member comprises titanium dioxide and/or zinc oxide, and the material of the retaining wall structure comprises titanium dioxide and/or zinc oxide.

In one embodiment, the height of the adjustment member is greater than the thickness of the substrate;

in the width direction of the gap, the width of a first end of the adjusting piece is larger than that of a second end, wherein the first end is positioned outside the gap, and the second end is positioned in the gap;

in the width direction of the gap, the width of the first end of the adjusting piece is larger than that of the gap;

the orthographic projection of the first end of the adjusting piece on the base plate is overlapped with the orthographic projection of the retaining wall structure on the base plate.

In one embodiment, the material of the adjustment member is an elastic material.

In one embodiment, the adjusting member is of an integrally formed structure, or of a split structure.

In one embodiment, the retaining wall structure is a grid structure, the retaining wall structures are respectively arranged on two sides of the gap, and the shape of the surface of the adjusting piece facing the retaining wall structure is complementary with the shape of the surface of the retaining wall structure facing the adjusting piece;

the surface of the adjusting piece facing the retaining wall structure is attached to the surface of the retaining wall structure facing the adjusting piece;

the retaining wall structure faces the surface of regulating part is the cambered surface, the regulating part faces the surface of retaining wall structure is the cambered surface.

In one embodiment, the height of the retaining wall structure is greater than the height of the light emitting element;

the height of the adjusting piece is smaller than or equal to the maximum distance between the surface of the retaining wall structure far away from the substrate and the surface of the retaining wall structure far away from the substrate.

In one embodiment, the height of the light emitting element is 100-150 micrometers, the height of the retaining wall structure is 200-300 micrometers, and the height of the adjusting piece is 100-300 micrometers.

In one embodiment, the height of the retaining wall structure is less than the height of the light emitting element;

the height of the adjusting piece is larger than or equal to the maximum distance between the surface of the retaining wall structure far away from the substrate and the surface of the retaining wall structure far away from the substrate.

In one embodiment, the lamp panel further comprises a transparent protective layer, and the transparent protective layer is positioned on the light-emitting element;

the height of the adjusting piece is smaller than or equal to the maximum distance between the surface of the transparent protective layer far away from the substrate and the surface of the substrate far away from the transparent protective layer.

According to a second aspect of the embodiments of the present invention, a display device is provided, which includes a display panel and the backlight module.

According to a third aspect of the embodiments of the present invention, there is provided a method for manufacturing a backlight module, the backlight module including: at least two lamp panels and a regulating part; the method comprises the following steps:

arranging at least two lamp panels adjacently; the lamp panel comprises a substrate, a light-emitting element and a retaining wall structure, wherein the light-emitting element and the retaining wall structure are respectively positioned on the substrate and are positioned on the same side of the substrate; a gap is formed between the substrates of the two adjacent lamp panels;

placing at least a portion of the adjustment member in the gap; wherein the material properties of the adjustment member are substantially the same as the material properties of the retaining wall structure.

According to the above embodiment, since the gap is formed between the substrates of the two adjacent lamp panels, at least part of the adjusting piece is arranged in the gap, and the material characteristics of the adjusting piece are basically the same as those of the retaining wall structure of the lamp panels, when the backlight module provides backlight, the backlight brightness at the gap is close to the backlight brightness at the lamp panels, which is beneficial to weakening or eliminating the seam shadows and improving the display effect.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

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

FIG. 1 is a top view of a backlight module according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a backlight module according to an embodiment of the present invention;

FIG. 3 is a schematic view of an adjustment member according to an embodiment of the present invention;

fig. 4 is a schematic arrangement diagram of a lamp panel according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view of another backlight module according to an embodiment of the present invention;

fig. 6 is a flowchart illustrating a method for manufacturing a backlight module according to an embodiment of the invention.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

When the light source in the backlight module of the display device is a MiniLED (sub-millimeter light emitting diode), the problems of manufacturing process yield, heat dissipation and the like are considered, and for a large-size display device, the backlight module is formed by splicing a plurality of sub-modules.

As shown in fig. 1-2, an embodiment of the invention provides a backlight module. Fig. 1 is a top view of the backlight module, and fig. 2 is a cross-sectional view of fig. 1 along a section line AA'. The backlight module comprises: at least two lamp panels 11 and regulating part 12.

In this embodiment, as shown in fig. 1, at least two lamp panels 11 are disposed adjacently.

In this embodiment, as shown in fig. 2, each lamp panel 11 includes a substrate 111, a light emitting element 112 and a retaining wall structure 113, and the light emitting element 112 and the retaining wall structure 113 are respectively located on the substrate 111 and on the same side of the substrate 111. The base plate 111 interval of two adjacent lamp plates 11 sets up, is provided with the gap between the base plate 111 of two adjacent lamp plates 11 promptly, and the at least part of regulating part 12 sets up in the gap.

In this embodiment, the material properties of the adjustment member 12 are substantially the same as those of the retaining wall structure 113.

In this embodiment, because two adjacent lamp plates 11 adjoin each other and set up, be provided with the gap between the base plate 111 of two adjacent lamp plates 11, at least part setting of regulating part 12 is in this gap, and the material characteristic of regulating part 12 is the same basically with the material characteristic of retaining wall structure 113 of lamp plate 11, consequently, when backlight unit is luminous, the backlight brightness that is located the region of gap place can be close to the backlight brightness of lamp plate 11 place region, be favorable to weakening or eliminating the piece dark shadow, promote display effect.

The backlight module provided by the embodiment of the invention is briefly introduced above, and the backlight module provided by the embodiment of the invention is described in detail below.

The embodiment of the invention also provides a backlight module. As shown in fig. 1 to 2, the backlight module includes 4 lamp panels 11 and an adjusting member 12.

It should be noted that in other embodiments, the number of the lamp panels 11 may be 2, 3, 6, 7, 8 or other numbers, and it is understood that the sizes of the lamp panels 11 used for splicing may be the same or different.

In this embodiment, as shown in fig. 1, the four lamp panels 11 are arranged in an array along a first direction X and a second direction Y. Wherein every two lamp panels 11 are adjacent. For example, in the first direction X, every two lamp panels 11 are adjacent, and in the second direction Y, every two lamp panels 11 are adjacent.

In the present embodiment, as shown in fig. 2, each lamp panel 11 includes a substrate 111, a light emitting element 112, a retaining wall structure 113 and a transparent protection layer 114.

In the present embodiment, as shown in fig. 2, the light emitting element 112 and the retaining wall structure 113 are respectively located on the substrate 111 and are located on the same side of the substrate 111. The transparent protective layer 114 covers the light emitting element 112 for protecting the light emitting element 112. The surface of the transparent protection layer 114 away from the substrate 111 is planar.

In this embodiment, the substrate 111 may include a substrate and a driving circuit on the substrate, and the driving circuit is used for driving the light emitting element 112 to emit light.

In the present embodiment, the light emitting element 112 may be a MiniLED, but is not limited thereto. The light emitting element 112 may emit blue light, but is not limited thereto. The backlight module may further include a color conversion film for converting blue light into white light.

In the present embodiment, as shown in fig. 1, the retaining wall structures 113 may be a grid structure, and the retaining wall structures 113 may be present around each light emitting element 112. The dam structures 113 are used to improve the backlight brightness. The retaining wall structure 113 includes a first shielding portion disposed along the first direction X and a second shielding portion disposed along the second direction Y, and the plurality of first shielding portions and the plurality of second shielding portions are interwoven to form a grid structure.

In some embodiments, the retaining wall structures 113 may be formed by printing or coating. As shown in fig. 2, a surface of the second shielding portion away from the substrate 111 along the second direction Y may be a cambered surface. The cross-sectional profile of the second shade in a direction perpendicular to the second direction Y is arcuate, for example, as part of a hyperbolic, parabolic, or conical curve. The cross section of the second blocking portion perpendicular to the second direction Y is located in an XZ plane, which is a plane in which the first direction X and the third direction Z are located, and the third direction Z is perpendicular to the surface of the substrate 111 facing the retaining wall structure 113. Similarly, the surface of the first shielding portion away from the substrate 111 may be an arc surface. The cross-sectional profile of the first shade in a direction perpendicular to the first direction X is arcuate, for example, as part of a hyperbolic, parabolic, or conical curve.

In the present embodiment, the material properties of the retaining wall structure 113 may include reflectivity and/or color. The reflectivity of the retaining wall structure 113 may be greater than 90%, and may be equal to 90%. The retaining wall structure 113 is white in color.

In the present embodiment, the material of the retaining wall structure 113 may be white silicon-based glue, but is not limited thereto. The silicon glue is a silicon organic material.

In this embodiment, the material of the retaining wall structure 113 may include titanium dioxide. The main component of titanium dioxide is titanium dioxide (TiO)₂). In this embodiment, the color coordinates of the color of the retaining wall structure 113 can be adjusted by adjusting the ratio of titanium dioxide to other materials in the retaining wall structure 113. Of course, in other embodiments, the material of the retaining wall structure 113 may include zinc oxide, and the color coordinate of the color of the retaining wall structure 113 may be adjusted by adjusting the ratio of the zinc oxide to other materials in the retaining wall structure 113.

In the present embodiment, the height of the retaining wall structure 113 may be greater than the height of the light emitting element 112. The height of the retaining wall structure 113 is the dimension in the third direction Z. The height of the light emitting element 112 is a dimension in the third direction Z.

In this embodiment, the material of the transparent protection layer 114 may be a transparent organic material, such as a transparent optical adhesive. The surface of the transparent protection layer 114 away from the substrate 111 may be a plane, and the surface of the transparent protection layer 114 away from the substrate 111 may be parallel to the light emitting surface of the light emitting element 112, but is not limited thereto.

In the present embodiment, as shown in fig. 2, a gap is provided between the substrates 111 of two adjacent lamp panels 11. At least part of the adjustment member 12 is arranged in the gap.

In this embodiment, the material properties of the adjustment member 12 are substantially the same as those of the retaining wall structure 113. The material properties of the adjusting member 12 include color and reflectivity. Substantially the same meaning includes both the same and similar meanings.

In the present embodiment, the color of the adjusting member 12 is white, and the color coordinate of the color of the adjusting member 12 is substantially the same as the color coordinate of the color of the retaining wall structure 113. The material of the regulating member 12 includes titanium dioxide. In this embodiment, the color coordinate of the color of the adjusting member 12 can be adjusted by adjusting the ratio of the titanium dioxide to other materials in the adjusting member 12. Of course, in other embodiments, the material of the adjusting member 12 may include zinc oxide, and the color coordinates of the color of the adjusting member 12 may be adjusted by adjusting the ratio of the zinc oxide to other materials in the adjusting member 12.

In the present embodiment, the reflectivity of the adjusting member 12 is greater than 90%, and of course, the reflectivity of the adjusting member 12 may be equal to 90%.

In the present embodiment, the reflectivity of the adjusting element 12 may be equal to the reflectivity of the retaining wall structure 113, and the surface of the adjusting element 12 away from the substrate 111 may be a plane, but is not limited thereto. Thus, it is possible to avoid abnormal backlight brightness caused by the convex or concave surface of the adjuster 12 away from the substrate 111 when the reflectivity of the adjuster 12 is equal to that of the retaining wall structure 113.

Of course, in another embodiment, when the reflectivity of the adjusting element 12 is greater than the reflectivity of the retaining wall structures 113, the surface of the adjusting element 12 away from the substrate 111 may be a convex surface, and since the surface of the adjusting element 12 away from the substrate 111 has a light scattering effect when the surface is a convex surface, the defect of greater backlight brightness caused by the fact that the reflectivity of the adjusting element 12 is greater than the reflectivity of the retaining wall structures 113 can be offset, so that the backlight brightness at the adjusting element 12 is closer to the backlight brightness at the retaining wall structures 113.

In another embodiment, when the reflectivity of the adjusting member 12 is smaller than the reflectivity of the retaining wall structure 113, the surface of the adjusting member 12 away from the substrate 111 is a concave surface. Since the surface of the adjusting element 12 away from the substrate 111 has a converging effect on light when it is a concave surface, the defect of low backlight brightness caused by the fact that the reflectivity of the adjusting element 12 is less than that of the retaining wall structure 113 can be counteracted, so that the backlight brightness at the adjusting element 12 is closer to that at the retaining wall structure 113.

In the present embodiment, as shown in fig. 2, the width of the first end D1 of the adjusting piece 12 is greater than the width of the second end D2 in the width direction of the gap, wherein the first end D1 is located outside the gap between two adjacent base plates 111, and the second end D2 is located in the gap between two adjacent base plates 111. In fig. 2, the slit extends in the second direction Y, and thus the width direction is the first direction X. In other embodiments, the extending direction of the slit is the first direction X, and the width direction of the slit is the second direction Y. Also, the first end D1 of the adjuster 12 has a width greater than the width of the gap in the width direction of the gap. In this way, the adjusting member 12 can block the gap between two adjacent substrates 111, which is beneficial to avoiding the problem of residual part of seam shadow. Furthermore, it may be convenient to mount the adjustment member 12 in the gap or to adjust the position of the adjustment member 12.

In the present embodiment, as shown in fig. 2, an orthographic projection of the first end D1 of the adjusting member 12 on the base plate 111 overlaps with an orthographic projection of the retaining wall structure 113 on the base plate 111. In this way, the first end D1 of the adjusting member 12 can block the position of the base plate 111 not covered by the retaining wall structure 113, and therefore, the problem of residual part of the seam shadow can be avoided.

In the present embodiment, as shown in fig. 2, the height of the regulating member 12 is larger than the thickness of the substrate 111. The height of the adjustment member 12 is the dimension in the third direction Z. The thickness of the substrate 111 is the dimension of the substrate 111 in the third direction Z. Thus, the light emitted from the light emitting element 112 is more easily reflected by the adjusting member 12, which is advantageous for exerting the light reflecting effect of the adjusting member 12.

In the present embodiment, as shown in fig. 2, the height of the adjusting member 12 may be equal to the maximum distance between the surface of the retaining wall structure 113 away from the substrate and the surface F2 of the substrate 111 away from the retaining wall structure 113. In this way, the adjuster 12 is prevented from contacting or pressing against other components in the backlight module. Of course, the height of the adjusting member 12 can also be smaller than the maximum distance between the surface of the retaining wall structure 113 away from the substrate and the surface F2 of the substrate 111 away from the retaining wall structure 113.

In this embodiment, as shown in fig. 2, retaining wall structures 113 are respectively disposed on two sides of the gap, a surface of the retaining wall structure 113 facing the adjusting member 12 is an arc surface, and a surface of the adjusting member 12 facing the retaining wall structure 113 is also an arc surface. The profile of the surface of the adjusting member 12 facing the retaining wall structure 113 is complementary to the profile of the surface of the retaining wall structure 113 facing the adjusting member 12. Thus, the distance between the adjusting member 12 and the retaining wall structure 113 can be made closer, and the transition between the backlight brightness of the area where the adjusting member 12 is located and the surrounding backlight brightness can be made smoother.

In the present embodiment, as shown in fig. 2, the surface of the adjusting member 12 facing the retaining wall structure 113 and the surface of the retaining wall structure 113 facing the adjusting member 12 can be attached to each other. Thus, it is possible to avoid that there is a gap between the adjustment member 12 and the retaining wall structure 113, which may cause a non-smooth transition between the backlight brightness in the region where the adjustment member 12 is located and the surrounding backlight brightness.

In this embodiment, the material of the adjusting member 12 is an elastic material. The material of the adjuster 12 may be, but is not limited to, silicone rubber. Wherein the silicone rubber is a silicone organic material. The material of the adjustment member 12 may be a flexible silicone-based rubber. In this way, the surface of the adjusting member 12 facing the retaining wall structure 113 can be made to fit more closely to the surface of the retaining wall structure 113 facing the adjusting member 12. Further, since the flexible silicone rubber is easily deformed, even if the size of the portion of the adjuster 12 provided in the gap is slightly larger than the size of the gap, it is easier to fit the adjuster 12 into the gap. In this embodiment, regulating part 12 can also play the relative distance between two adjacent lamp plates 11 of control, and when two lamp plates 11 that adjacent set up received external force and take place the relative motion, regulating part 12 still can play the effect of buffering.

In the embodiment, the material of the adjusting member 12 is different from that of the retaining wall structure 113, but the material of the adjusting member 12 and the material of the retaining wall structure 113 belong to the same class, and are all silicon-based organic materials, which is beneficial to make the material characteristics of the adjusting member 12 and the material characteristics of the retaining wall structure 113 closer.

In the present embodiment, as shown in fig. 1 and 3, the adjusting member 12 may be an integrally formed structure. Like this, can conveniently install regulating part 12 in the concatenation gap between a plurality of lamp plates 11, be favorable to improving the installation effectiveness. Of course, in other embodiments, the adjustment member 12 may be a split structure. For example, the adjusting element 12 may include a first sub-portion and two second sub-portions, the first sub-portion being separated from the second sub-portion without being fixedly connected, the first sub-portion being located in a slit extending along the first direction X, the second sub-portion being located in a slit extending along the second direction Y.

It should be noted that, when the backlight module includes two lamp panels 11, the shape of the adjusting member 12 may be a strip, when the backlight module is spliced by four lamp panels 11 of the same size in a 2 × 2 manner, the shape of the adjusting member 12 may be a cross, and when the backlight module is spliced by nine lamp panels 11 of the same size in 3 × 3, the shape of the adjusting member 12 may be a cross; when the backlight module includes n × m lamp panels 11 of the same size, the adjusting member 12 may be in a grid shape, where n and m are not less than 3.

In this embodiment, as shown in fig. 4, before the adjusting element 12 is installed in the gap, the 4 lamp panels 11 may be fixed by using a limiting jig. For example, this tool can be the stopper, and at the in-process of fixed 4 lamp plates 11, the stopper is pressed from both sides between two adjacent lamp plates 11 to the width in gap between the base plate 111 that makes two adjacent lamp plates 11 accords with the demand. For example, the width of the gap between the base plates 111 of two adjacent lamp panels 11 is substantially the same as the width of the second end D2 of the adjusting member 12, or the width of the gap between the base plates 111 of two adjacent lamp panels 11 is slightly larger than the width of the second end D2 of the adjusting member 12. After the lamp panel 11 is fixed, the limiting block is taken out of the gap. Then, the adjuster 12 is mounted in the above-mentioned gap, and the backlight module shown in fig. 1 is obtained.

In the present embodiment, the height of the light emitting device 112 is 100 to 150 μm. For example, the height of the light emitting element 112 may be 100 microns, 125 microns, or 150 microns, but is not limited thereto.

In the embodiment, the height of the retaining wall structure 113 is 200 to 300 μm. For example, the height of the retaining wall structures 113 may be 200 microns, 250 microns, or 300 microns.

In the present embodiment, the height of the adjuster 12 may be 100 microns, 200 microns, or 300 microns.

In this embodiment, because light-emitting element 112 both sides are provided with retaining wall structure 113 respectively on every lamp plate 11, consequently, there is retaining wall structure 113 in every lamp plate 11 edge, when two adjacent and be provided with the gap between the base plate 111 of two adjacent lamp plates 11 of lamp plate 11, there is retaining wall structure 113 respectively in this gap both sides, set up the at least part of regulating part 12 in this gap, and the material characteristic of regulating part 12 is the same basically with the material characteristic of retaining wall structure 113 of lamp plate 11, consequently, when backlight unit provides the backlight, the backlight luminance that is located gap department can be close the backlight luminance of lamp plate 11 department, be favorable to weakening or eliminating the piece seam shadow, promote the display effect.

The embodiment of the invention also provides a backlight module. Unlike the above embodiments, in the present embodiment, as shown in fig. 5, the height of the retaining wall structure 113 is smaller than that of the light emitting element 112, that is, the retaining wall structure 113 may be a film layer provided with an opening for exposing the pad on the substrate 111 electrically connected to the light emitting component. Moreover, the surface of the transparent protection layer 114 away from the substrate 111 is an arc surface to form a convex lens shape, so that the light emitting shape of the light emitting element 112 can be adjusted. In the present embodiment, the transparent protection layer 114 is disposed on the light emitting element 112 and can cover the light emitting element 112.

In the present embodiment, the material of the transparent protection layer 114 may be a transparent resin, but is not limited thereto.

In the present embodiment, the material of the retaining wall structure 113 may be white ink, but is not limited thereto.

In this embodiment, the material of the retaining wall structure 113 may further include a photosensitive material. Thus, before electrically connecting the light emitting elements 112 to the substrate 111, a whole layer of light reflecting material film is prepared on the substrate 111, and then openings are prepared on the light reflecting material film by using a photolithography process to expose the pads on the substrate 111 electrically connected to the light emitting components, so as to obtain the retaining wall structures 113 in fig. 5.

In the present embodiment, as shown in fig. 5, the height of the adjusting member 12 may be greater than the distance from the surface F3 of the retaining wall structure 113 far from the substrate 111 to the surface F2 of the substrate 111 far from the retaining wall structure 113. Thus, the light emitted from the light emitting element 112 is more easily reflected by the adjusting member 12, which is advantageous for exerting the light reflecting effect of the adjusting member 12. Of course, in other embodiments, the height of the adjusting member 12 can also be equal to the distance from the surface F3 of the retaining wall structure 113 away from the substrate 111 to the surface F1 of the substrate 111 away from the retaining wall structure 113. In this way, the transition between the backlight brightness in the area of the adjustment member 12 and the surrounding backlight brightness can be made smoother.

In the present embodiment, the height of the regulating member 12 is smaller than the maximum distance between the surface of the transparent protective layer 114 away from the substrate and the surface F2 of the substrate 111 away from the transparent protective layer 114. In this way, the adjuster 12 is prevented from contacting or pressing against other components in the backlight module. Of course, in other embodiments, the height of the adjusting member 12 may also be equal to the maximum distance between the surface of the transparent protection layer 114 away from the substrate and the surface F2 of the substrate 111 away from the transparent protection layer 114.

The embodiment of the invention also provides a display device, which comprises a display panel and the backlight module of any one of the embodiments.

In this embodiment, the display panel may be a liquid crystal display panel, but is not limited thereto.

The display device in this embodiment may be: any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator and the like.

The embodiment of the invention also provides a preparation method of the backlight module, which is used for preparing the backlight module in any embodiment. As shown in fig. 6, the method for manufacturing the backlight module includes the following steps 601-602:

in step 601, at least two lamp panels 11 are adjacently arranged; the lamp panel 11 includes a substrate 111, a light emitting element 112 and a retaining wall structure 113, wherein the light emitting element 112 and the retaining wall structure 113 are respectively located on the substrate 111 and at the same side of the substrate 111; a gap is arranged between the substrates 111 of two adjacent lamp panels 11.

In this step, as shown in fig. 4, two lamp panels 11 in 4 lamp panels 11 are adjacent to each other, for example, the 4 lamp panels 11 may be fixed by using a limiting jig. Wherein, can fix 4 lamp plates 11 on the backplate in backlight unit, also can fix 4 lamp plates 11 in a backup pad. The limiting jig can be a limiting block. In the process of fixing 4 lamp panels 11, a limiting block is clamped between two adjacent lamp panels 11, so that the width of the gap 41 between the base plates 111 of the two adjacent lamp panels 11 meets the requirement. For example, the width of the gap 41 between the base plates 111 of two adjacent lamp panels 11 is substantially the same as the width of the second end D2 of the adjusting member 12, or the width of the gap 41 between the base plates 111 of two adjacent lamp panels 11 is slightly larger than the width of the second end D2 of the adjusting member 12. After finishing the lamp plate 11 is fixed, take out the stopper from the gap again, accomplish the concatenation of lamp plate 11.

In step 602, placing at least a portion of an adjustment member in a gap; wherein the material properties of the adjustment member are substantially the same as the material properties of the retaining wall structure.

In this step, the adjusting member 12 is mounted in the gap 41 to obtain the backlight module shown in fig. 1.

It can be understood that, in order to ensure that the backlight module after splicing the plurality of lamp panels 11 can provide uniform backlight brightness everywhere, as shown in fig. 2 or fig. 5, the distance P1 between two adjacent light emitting elements 112 on the same lamp panel 11 and the distance P2 between two adjacent light emitting elements 112 on the adjacent lamp panels 11 respectively should be the same theoretically. Further, since the retaining wall structures 113 are disposed on each lamp panel 11 between two adjacent light emitting elements 112, if the design requirement of P1 ═ P2 is to be satisfied, for the light emitting elements 112 in the row at the extreme edge of the lamp panel 11, the width of the retaining wall structure 113' on the side close to the edge of the lamp panel 11 needs to be smaller than the width of the retaining wall structures 113 in other regions of the lamp panel 11 in the splicing direction (e.g., the first direction X in fig. 2 or fig. 5).

Therefore, for two lamp panels 11 adjacent to each other, the adjacent edge regions are provided with retaining wall structures 113 ', gaps exist between the two retaining wall structures 113 ', at least part of the adjusting piece 12 is arranged in the gaps, the material characteristics of the adjusting piece 12 are basically the same as those of the retaining wall structures 113 ', when the backlight module provides backlight, the difference between the backlight brightness of the gap region between the adjacent lamp panels and the backlight brightness of the region where the lamp panels 11 are located is reduced, weakening or eliminating of the splicing shadows is facilitated, and the display effect is improved.

Moreover, after at least two lamp panels 11 are arranged adjacently, the adjusting piece is arranged in a gap between the base plates 111 of the two adjacent lamp panels 11, no obstacle exists in the assembling process, the space is not limited, any part does not need to be avoided, the assembling is convenient, and the assembling efficiency can be improved.

It is noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. Also, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer or intervening layers may also be present. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or intervening layers or elements may also be present. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer between the two layers or elements, or more than one intermediate layer or element may also be present. Like reference numerals refer to like elements throughout.

In the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

1. A backlight module, comprising: at least two lamp panels which are adjacently arranged;

an adjustment member at least partially disposed in the gap; the material properties of the adjustment member are substantially the same as the material properties of the retaining wall structure.

2. A backlight module according to claim 1, wherein the material property comprises reflectivity;

3. The backlight module according to claim 1, wherein when the reflectivity of the adjusting member is greater than the reflectivity of the retaining wall structure, the surface of the adjusting member away from the substrate is convex; and/or the presence of a gas in the gas,

4. The backlight module as claimed in claim 1, wherein the material property includes color, the color of the adjusting member is white, the color of the retaining wall structure is white,

5. The backlight module as claimed in claim 4, wherein the material of the adjusting member comprises titanium dioxide and/or zinc oxide, and the material of the retaining wall structure comprises titanium dioxide and/or zinc oxide.

6. A backlight module according to claim 1, wherein the height of the adjusting member is greater than the thickness of the substrate;

7. A backlight module according to claim 1, wherein the adjusting member is made of an elastic material.

8. The backlight module as claimed in claim 1, wherein the adjusting member is of an integrally formed structure or of a split structure.

9. The backlight module according to claim 1, wherein the retaining wall structures are grid structures, the retaining wall structures are respectively disposed on two sides of the gap, and the shape of the surface of the adjusting member facing the retaining wall structures is complementary to the shape of the surface of the retaining wall structures facing the adjusting member;

10. The backlight module as claimed in claim 9, wherein the height of the dam structure is greater than the height of the light emitting elements;

11. The backlight module as claimed in claim 1, wherein the height of the light emitting element is 100-150 μm, the height of the retaining wall structure is 200-300 μm, and the height of the adjusting member is 100-300 μm.

12. The backlight module as claimed in claim 1, wherein the height of the dam structure is less than the height of the light emitting elements;

13. The backlight module according to claim 12, wherein the lamp panel further comprises a transparent protective layer on the light emitting elements;

14. A display device comprising a display panel and the backlight module according to any one of claims 1 to 13.

15. A method for manufacturing a backlight module is characterized in that the backlight module comprises: at least two lamp panels and a regulating part; the method comprises the following steps: