CN114253029B

CN114253029B - Backlight module and display device

Info

Publication number: CN114253029B
Application number: CN202111572551.1A
Authority: CN
Inventors: 秦雪飞
Original assignee: Tianma Microelectronics Co Ltd
Current assignee: Tianma Microelectronics Co Ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2023-12-12
Anticipated expiration: 2041-12-21
Also published as: CN114253029A

Abstract

The embodiment of the invention discloses a backlight module and a display device, wherein the backlight module comprises a substrate and a plurality of light-emitting units positioned on one side of the substrate; the backlight module further comprises a reflecting structure, wherein the reflecting structure comprises a reflecting wall close to one side of the light-emitting unit; the backlight module further comprises a first light-emitting area and a second light-emitting area, and the second light-emitting area surrounds at least part of the first light-emitting area; the light emitting units comprise a plurality of first light emitting units located in the first light emitting area and a plurality of second light emitting units located in the second light emitting area, the first light emitting units comprise at least one first light emitting element, the second light emitting units comprise at least one second light emitting element, and the arrangement modes of the first light emitting elements and the second light emitting elements are different. The backlight module provided by the embodiment of the invention can improve the reflection times of light rays and the light mixing distance by arranging the reflection structure, and can ensure the uniformity of the whole light emission of the backlight module by carrying out different arrangement modes on the light emitting elements of different light emitting areas.

Description

Backlight module and display device

Technical Field

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

Background

With the continuous development of liquid crystal display technology, liquid crystal display devices have been widely used in various aspects of life. The liquid crystal display device comprises a backlight module and a display panel, wherein the backlight module provides a light source for the display panel and is an indispensable part of the liquid crystal display device.

When the backlight of the existing display module is designed in a direct type, a series of light emitting problems can occur due to the limitation of the optical characteristics of the light source.

Disclosure of Invention

The embodiment of the invention provides a backlight module and a display device, which are used for solving some problems in the existing backlight module by designing the arrangement of light-emitting elements in a first light-emitting area and a second light-emitting area of the backlight module and adding a reflecting structure.

In a first aspect, an embodiment of the present invention provides a backlight module, including a substrate and a plurality of light emitting units located at one side of the substrate;

the backlight module further comprises a reflecting structure, wherein the reflecting structure comprises a reflecting wall close to one side of the light-emitting unit;

the backlight module further comprises a first light-emitting area and a second light-emitting area, wherein the second light-emitting area surrounds at least part of the first light-emitting area;

the light emitting units comprise a plurality of first light emitting units located in the first light emitting area and a plurality of second light emitting units located in the second light emitting area, the first light emitting units comprise at least one first light emitting element, the second light emitting units comprise at least one second light emitting element, and the arrangement modes of the first light emitting elements and the second light emitting elements are different.

In a second aspect, an embodiment of the present invention further provides a display apparatus, where the display apparatus includes the backlight module provided in any embodiment of the present invention.

The backlight module provided by the embodiment of the invention comprises a substrate, a plurality of light emitting units and a reflecting structure, wherein the light emitting units and the reflecting structure are positioned on one side of the substrate. By arranging the reflecting structure on one side close to the reflecting unit, the optical path of light emitted by the light emitting unit can be increased, the light mixing distance can be increased, and the thinned backlight module can be realized. Meanwhile, a plurality of light emitting units are arranged in the first light emitting area and the second light emitting area of the backlight module, at least one first light emitting element is arranged in the first light emitting unit, at least one second light emitting element is arranged in the second light emitting unit, and the uniformity of light output of the backlight module is ensured through the regulation and control of the arrangement modes of the first light emitting element and the second light emitting element, so that display defects of halation and lamp shadows are avoided.

Drawings

In order to more clearly illustrate the technical solution of the exemplary embodiments of the present invention, a brief description is given below of the drawings required for describing the embodiments. It is obvious that the drawings presented are only drawings of some of the embodiments of the invention to be described, and not all the drawings, and that other drawings can be made according to these drawings without inventive effort for a person skilled in the art.

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

FIG. 2 is a schematic cross-sectional view of the backlight module shown in FIG. 1 along the cross-sectional line AA';

fig. 3 is a schematic structural diagram of a backlight module according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of the backlight module shown in FIG. 3 along the cross-sectional line BB';

fig. 5 is a schematic structural diagram of another backlight module according to an embodiment of the invention;

fig. 6 is a schematic structural diagram of another backlight module according to an embodiment of the invention;

fig. 7 is a schematic structural diagram of another backlight module according to an embodiment of the invention;

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

fig. 9 is a schematic structural diagram of another backlight module according to an embodiment of the invention;

fig. 10 is a schematic structural diagram of another backlight module according to an embodiment of the invention;

fig. 11 is a schematic structural diagram of another backlight module according to an embodiment of the invention;

fig. 12 is a schematic structural diagram of another backlight module according to an embodiment of the invention;

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

fig. 14 is a schematic structural diagram of another backlight module according to an embodiment of the invention;

Fig. 15 is a schematic structural diagram of another backlight module according to an embodiment of the invention;

fig. 16 is a schematic structural diagram of another backlight module according to an embodiment of the invention;

FIG. 17 is a schematic cross-sectional view of the backlight module shown in FIG. 16 along the section line EE'.

FIG. 18 is a schematic cross-sectional view of the backlight module shown in FIG. 17 along the cross-sectional line GG';

FIG. 19 is a schematic cross-sectional view of the backlight module shown in FIG. 16 along the section line EE';

fig. 20 is a schematic cross-sectional view of the backlight module shown in fig. 19 along a cross-sectional line MM';

fig. 21 is a schematic cross-sectional view of the backlight module shown in fig. 19 along a section line MM';

fig. 22 is a schematic structural diagram of a display device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be fully described below by way of specific embodiments with reference to the accompanying drawings in the examples of the present invention. It is apparent that the described embodiments are some, but not all, embodiments of the present invention, and that all other embodiments, which a person of ordinary skill in the art would obtain without making inventive efforts, are within the scope of this invention.

Fig. 1 is a schematic structural view of a backlight module in the prior art, and fig. 2 is a schematic structural view of the backlight module shown in fig. 1 along a section line AA ', as shown in fig. 1 and fig. 2, the backlight module 01' includes a substrate 10' and a plurality of light emitting units 20' located at one side of the substrate 10 '. The thinned backlight module 01 'can be realized by reducing the distance d' between the substrate 10 'and the light emitting film sheet 30'. However, decreasing d ' may cause insufficient mixing distance of the light emitted from the light emitting unit 20', affect the contrast ratio of the light emitted from the backlight module 01', and display defects such as shadows and halos may occur. As shown in the arrangement of the light emitting units 20' in fig. 1, the light emitting brightness of the edge area of the backlight module 01' is lower than the light emitting brightness of the central area, and the uniformity of the light emitting of the whole backlight module 01' is poor.

Based on the technical problems, the embodiment of the invention provides a backlight module, which comprises a substrate and a plurality of light emitting units positioned at one side of the substrate; the backlight module further comprises a reflecting structure, wherein the reflecting structure comprises a reflecting wall close to one side of the light-emitting unit; the backlight module further comprises a first light-emitting area and a second light-emitting area, and the second light-emitting area surrounds at least part of the first light-emitting area; the light emitting units comprise a plurality of first light emitting units located in the first light emitting area and a plurality of second light emitting units located in the second light emitting area, the first light emitting units comprise at least one first light emitting element, the second light emitting units comprise at least one second light emitting element, and the arrangement modes of the first light emitting elements and the second light emitting elements are different. By adopting the technical scheme, the reflection structure is arranged around the light-emitting unit, the reflection times of the emergent light rays are improved, the light mixing distance is improved, display defects such as lamp shadows and halation are avoided, meanwhile, the light-emitting elements of the first light-emitting area and the second light-emitting area are reasonably regulated and controlled in an arrangement mode, and the overall emergent light uniformity of the backlight module is ensured.

The foregoing is the core idea of the present invention, and the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without making any inventive effort are intended to fall within the scope of the present invention.

Fig. 3 is a schematic structural view of a backlight module according to an embodiment of the present invention, fig. 4 is a schematic structural view of a section line BB' of the backlight module shown in fig. 3, and fig. 5 is a schematic structural view of another backlight module according to an embodiment of the present invention, and referring to fig. 3 to 5, the backlight module 10 according to an embodiment of the present invention includes a substrate 100 and a plurality of light emitting units 200 located at one side of the substrate 100; the backlight module 10 further includes a reflective structure 300, where the reflective structure 300 includes a reflective wall 310 near one side of the light emitting unit 200; the backlight module 10 further includes a first light emitting region 110 and a second light emitting region 120, wherein the second light emitting region 120 surrounds at least a portion of the first light emitting region 110; the light emitting unit 200 includes a plurality of first light emitting units 210 located in the first light emitting region 110 and a plurality of second light emitting units 220 located in the second light emitting region 120, the first light emitting units 210 include at least one first light emitting element 211, and the second light emitting units 220 include at least one second light emitting element 221, wherein the first light emitting elements 211 and the second light emitting elements 221 are arranged in different manners.

Referring to fig. 3 and 4, the backlight module 10 according to the embodiment of the invention includes a substrate 100, a light emitting unit 200, and a reflective structure 300. The substrate 100 serves as a carrier substrate of the light emitting unit 200, is electrically connected to the light emitting unit 200, and is used to supply a light emission driving signal to the light emitting unit 200. The substrate 100 may be a rigid substrate, such as glass, and the material of the substrate 100 is not particularly limited in the embodiments of the present invention. The light emitting unit 200 includes light emitting diodes, which may be electronic components such as Mini LEDs and Micro LEDs, and is used as a light emitting source of the backlight module 10. Because electronic components such as Mini LEDs or Micro LEDs are small in size, more light emitting units 200 can be arranged in the backlight module 10 with the same size by arranging the light emitting units 200 to comprise the Mini LEDs or the Micro LEDs, and the light emitting units are beneficial to realizing the fine light emitting control of the backlight module 10. Further, the light emitting unit 200 has a larger light emitting angle, for example, a light emitting angle of 180 °, which is beneficial to improving the overall light emitting effect of the backlight module 10.

Further, the reflecting structure 300 includes a reflecting wall 310, and the reflecting wall 310 is close to one side of the light emitting unit 200, and the light emitted by the light emitting unit 300 is reflected by the reflecting wall 310. By arranging the reflective structure 300 for increasing the optical path of the light emitted by the light emitting unit 200, the light mixing distance of the light emitting light is further increased, which is beneficial to realizing the thinned backlight module 10. The display defect that a backlight module in the prior art has a lamp shadow and a halation can be effectively overcome. According to the backlight module 10 provided by the embodiment of the invention, the uniformity of the light output of the backlight module 10 is further improved by arranging different light emitting areas, and the overall light output effect of the backlight module 10 is improved.

Specifically, the backlight module 10 further includes a first light emitting area 110 and a second light emitting area 120, the second light emitting area 120 is located in an edge area of the backlight module 10, the first light emitting area 110 is located in a central area of the backlight module 10, and the second light emitting area 120 surrounds at least a portion of the first light emitting area 110. By providing the plurality of light emitting units 200 in the first and second light emitting regions 110 and 120, the light emitting brightness of the edge and center regions of the backlight module 10 is ensured. Further, the light emitting unit 200 includes a first light emitting unit 210 and a second light emitting unit 220, where the plurality of first light emitting units 210 are located in the first light emitting area 110 to ensure the light emitting brightness of the first light emitting area 110, and the plurality of second light emitting units 220 are located in the second light emitting area 120 to ensure the light emitting brightness of the second light emitting area 120. Wherein the first light emitting unit 210 includes at least one first light emitting element 211, and the second light emitting unit 220 includes at least one second light emitting element 221. By arranging the first light emitting element 211 and the second light emitting element 221 differently, the brightness requirement of the edge area and the brightness requirement of the central area in the backlight module 10 can be respectively satisfied.

Specifically, the brightness requirement of the edge area and the brightness requirement of the central area in the backlight module 10 can be satisfied by different numbers of the first light emitting elements 211 and the second light emitting elements 221. As shown in fig. 3, the first light emitting unit 210 includes a first light emitting element 211, and the second light emitting unit 220 includes two second light emitting elements 221, and the number of the first light emitting elements 211 and the number of the second light emitting elements 221 in the backlight module 10 are not particularly limited in the embodiment of the present invention. The backlight module 10 provided in the embodiment of the invention can ensure that the difference between the light-emitting brightness of the central area and the light-emitting brightness of the edge area of the backlight module 10 is small through the difference in the number of the first light-emitting elements 211 and the second light-emitting elements 221, so that the overall light-emitting effect of the backlight module 10 is improved. Alternatively, in the backlight module 10, the specific arrangement modes of the first light emitting element 211 and the second light emitting element 221 may be different, as shown in fig. 5, the length of the first light emitting element 211 extends along the X direction, and the length of the second light emitting element 221 extends along the Y direction, that is, the distribution modes of the first light emitting element 211 and the second light emitting element 221 are different, so that the diversity of the arrangement of the first light emitting element 211 and the second light emitting element 221 is realized, and different types of backlight modules 10 are satisfied.

In summary, by arranging the reflecting structure around the light emitting unit, the backlight module provided by the embodiment of the invention improves the reflection times of the emergent light rays, increases the light mixing distance, avoids the display defects of lamp shadows and halos, and reasonably regulates the quantity and arrangement positions of the light emitting elements of the first light emitting area and the second light emitting area at the same time, thereby ensuring the overall emergent uniformity of the backlight module.

On the basis of the above-described embodiments, the second light-emitting region surrounds at least part of the first light-emitting region, and a plurality of distribution forms of the second light-emitting region and the first light-emitting region will be described in detail.

Fig. 6 is a schematic structural diagram of another backlight module according to an embodiment of the invention, and as shown in fig. 6, the second light emitting area 120 at least includes corner regions of the backlight module 10.

Specifically, the second light emitting area 120 includes at least corner areas of the backlight module 10, taking a quadrangle as an example, and the second light emitting area 120 is disposed at four corners of the quadrangle; taking a hexagon as an example, the second light emitting regions 120 are disposed at the six corners of the hexagon. Since the corner positions of the backlight module have a difference from the brightness of the light emitted from other positions, the backlight module 10 adjusts the brightness of the light emitted from the first light emitting region 110 and the second light emitting region 120 by adjusting the arrangement of the light emitting units 200 in the first light emitting region 110 and the second light emitting region 120. Specifically, the luminance of the corner area of the backlight module 10 is lower than the display luminance of the central area, the second light emitting area 120 may be disposed in the corner area of the backlight module 10, and by adjusting the arrangement mode of the light emitting units 200 in the second light emitting area 120, the luminance of the second light emitting area 120 is improved, so that the uniformity of the luminance of the backlight module 10 in the corner area and the central area is achieved.

Fig. 7 is a schematic structural diagram of another backlight module according to an embodiment of the invention, and as shown in fig. 7, the second light emitting area 220 further includes at least one edge area of the backlight module 10.

Specifically, the second light emitting area 220 further includes at least one edge area of the backlight module 10, for example, a quadrilateral, and the second light emitting area 120 is disposed at least one edge position of the quadrilateral; taking a hexagon as an example, the second light emitting region 120 is disposed at least one edge of the hexagon; taking a circular shape as an example, the second light emitting region 120 is at least at a part of the edge of the circular arc. Since the corner positions of the backlight module have a difference from the brightness of the light emitted from other positions, the backlight module 10 adjusts the brightness of the light emitted from the first light emitting region 110 and the second light emitting region 120 by adjusting the arrangement of the light emitting units 200 in the first light emitting region 110 and the second light emitting region 120. Specifically, the luminance of the backlight module 10 is lower than the display luminance of the central area, and the second light emitting area 120 may be disposed in at least one edge area of the backlight module 10, and as shown in fig. 7, the second light emitting area 120 is disposed in two edge areas of the backlight module 10. By adjusting the arrangement mode of the light emitting units 200 in the second light emitting area 120, the brightness of the light emitting area 120 is improved, so that the uniformity of the brightness of the backlight module 10 in the edge area and the center area is realized.

With continued reference to fig. 6, the second light emitting region 220 further includes a middle region of at least one edge of the backlight module 10.

Specifically, the second light emitting area 220 further includes a middle area of at least one edge of the backlight module 10, and taking a quadrangle as an example, the second light emitting area 120 includes a middle position of at least one edge of the quadrangle; taking a hexagon as an example, the second light emitting region 120 includes a middle position of at least one edge of the hexagon. Further, the brightness of the light output from the middle area of the edge of the backlight module 10 is lower than the display brightness of the central area, and the second light emitting area 120 can be disposed in the middle area of the edge of the backlight module 10, and by adjusting the arrangement of the light emitting units 200 in the second light emitting area 120, the brightness of the light output from the second light emitting area 120 is improved, so that uniformity of the brightness of the light output from the backlight module 10 in the central area and the central area of the edge is achieved.

On the basis of the above embodiments, the light emission brightness of the backlight module in the first light emitting region and the second light emitting region is different according to the arrangement manner of the first light emitting element and the second light emitting element, and a plurality of arrangement manners of the first light emitting element and the second light emitting element will be described in detail.

Fig. 8 is a schematic structural view of another backlight module according to an embodiment of the present invention, fig. 9 is a schematic structural view of another backlight module according to an embodiment of the present invention, fig. 10 is a schematic structural view of another backlight module according to an embodiment of the present invention, fig. 11 is a schematic structural view of another backlight module according to an embodiment of the present invention, and referring to fig. 3 to fig. 11, the distribution density of the first light emitting elements 211 is smaller than the distribution density of the second light emitting elements 221, and/or the extending direction of the long sides of the first light emitting elements 211 is different from the extending direction of the long sides of the second light emitting elements 221.

The second light emitting region 120 surrounds at least a portion of the first light emitting region 110, and the light emitting uniformity of the backlight module 10 is ensured by adjusting the light emitting brightness of the first light emitting region 110 and the second light emitting region 120. The brightness of the backlight module 10 in the second light emitting area 120 is lower than that in the first light emitting area 110, and the distribution mode of the first light emitting elements 211 in the first light emitting area 110 and the distribution mode of the second light emitting elements 221 in the second light emitting area 120 are adjusted, so that the brightness difference between the brightness of the backlight module 10 in the second light emitting area 120 and the brightness of the backlight module 110 is smaller, and the overall brightness uniformity of the backlight module 10 is ensured.

Specifically, by setting the distribution density of the first light emitting elements 211 to be smaller than that of the second light emitting elements 221, the brightness of the second light emitting area 220 is improved, and the brightness difference between the brightness of the backlight module 10 in the edge area and the brightness of the backlight module in the center area is not obvious. Illustratively, as shown in fig. 3, the second light emitting region 120 surrounds the entire first light emitting region 110, and the density of the second light emitting elements 221 disposed in the second light emitting region 120 is greater than the density of the first light emitting elements 211 disposed in the first light emitting region 110. As shown in fig. 6 and 7, the second light emitting region 120 surrounds a portion of the first light emitting region 110, and the density of the second light emitting elements 221 disposed in the second light emitting region 120 is greater than the density of the first light emitting elements 211 disposed in the first light emitting region 110. The distribution position of the second light emitting region 120 is not specifically limited in the embodiment of the present invention, and the distribution densities of the first light emitting element 211 and the second light emitting element 221 are not specifically limited.

Specifically, the backlight module 10 may realize diversity of the setting of the first light emitting element 211 and the second light emitting element 221 by setting that the extending direction of the long side in the first light emitting element 211 is different from the extending direction of the long side in the second light emitting element 221, so as to satisfy different types of backlight modules 10. Illustratively, as shown in fig. 5, the long sides of the first light emitting element 211 extend in the X direction and the long sides of the second light emitting element 221 extend in the Y direction. As shown in fig. 8, the long sides of the first light emitting element 211 extend in the Y direction, and the long sides of the second light emitting element 221 extend in the X direction. The extending directions of the long sides of the first light emitting element 211 and the second light emitting element 221 are not particularly limited, and the embodiments of the present invention conform to the diversified backlight modules 10 by setting different arrangement modes.

Further, as shown in fig. 9, 10 and 11, the backlight module 10 satisfies that the distribution density of the first light emitting elements 211 is smaller than that of the second light emitting elements 221, and the extending direction of the long sides of the first light emitting elements 211 is different from that of the long sides of the second light emitting elements 221. By adjusting the distribution density of the first light emitting element 211 and the distribution density of the second light emitting element 221, the brightness of the first light emitting area 110 and the second light emitting area 120 is further adjusted, the overall uniformity of the light emitted by the backlight module 10 is ensured, and meanwhile, the long-side arrangement mode of the first light emitting element 211 and the second light emitting element 221 is adjusted, so that the diversity of the backlight module 10 is improved.

Referring to fig. 3, 6, 7, 9, 10 and 11, the distribution density of the first light emitting elements 211 is smaller than that of the second light emitting elements 221, and the second light emitting unit 220 includes at least two second light emitting elements 221.

Wherein the distribution density of the first light emitting elements 211 is smaller than the distribution density of the second light emitting elements 221 can be achieved by providing different numbers of the first light emitting elements 211 and the second light emitting elements 221. That is, the number of the first light emitting elements 211 included in the first light emitting unit 210 is smaller than the number of the second light emitting elements 221 included in the second light emitting unit 220.

As illustrated in fig. 3, 6, 7, 9, 10, and 11, the second light emitting unit 220 includes two second light emitting elements 221, and the first light emitting unit 210 includes one first light emitting element 211, and the distribution density of the first light emitting elements 211 is smaller than that of the second light emitting elements 221. Further, the second light emitting unit 220 may include two or more, for example, three second light emitting elements 221 (not shown). By adjusting and controlling the distribution density of the first light emitting element 211 and the second light emitting element 221, the brightness of the second light emitting area 120 is improved, and the uniformity of the whole light emission of the backlight module 10 is ensured.

Fig. 12 is a schematic structural view of another backlight module according to an embodiment of the present invention, and fig. 13 is a schematic structural view of another backlight module according to an embodiment of the present invention, and referring to fig. 12 and fig. 13, in the same second light emitting unit 220, there are two second light emitting elements 221 with different extending directions of the long sides.

As shown in fig. 12 and 13, the second light emitting unit 220 includes two second light emitting elements 221, so as to ensure that the distribution density of the first light emitting elements 211 is smaller than that of the second light emitting elements 221, thereby improving the light emitting brightness of the second light emitting region 120. The second light emitting elements 221 included in the second light emitting unit 220 may include the same arrangement and different arrangements, so as to better adjust the light emitting brightness of the second light emitting area 120, and meet the requirements of different types of backlight modules 10.

Illustratively, as shown in region C of fig. 12, the two second light emitting elements 221 in the second light emitting unit 220 are distributed in the same manner. As shown in the region D in fig. 12, the two second light emitting elements 221 in the second light emitting unit 220 are distributed differently, that is, the extending directions of the long sides of the two second light emitting elements 221 are not identical, and by setting the arrangement of the multiple types of second light emitting elements 221, the light emitting brightness of different positions of the second light emitting unit 220 is increased, so as to further improve the light emitting brightness of the second light emitting region 120.

Fig. 14 is a schematic structural diagram of another backlight module according to an embodiment of the present invention, and referring to fig. 13, a plurality of second light emitting units 220 are arranged along a first direction X and/or a second direction Y, and the first direction X and the second direction Y intersect and are parallel to a plane on which the substrate 100 is located; the two second light emitting units 220 adjacently disposed in the first direction X include a second first light emitting unit 220A and a second light emitting unit 220B, the second first light emitting unit 220A includes a second first light emitting element 221A and a second light emitting element 221B, the second light emitting unit 220B includes a second third light emitting element 221C and a second fourth light emitting element 221D, the second first light emitting element 221A and the second light emitting element 221B are sequentially arranged in the first direction X, the second light emitting diode 221C and the second light emitting diode 221D are sequentially arranged along the first direction Y, and the long-side extending direction of the second light emitting diode 221A is the same as the long-side extending direction of the second light emitting diode 221D, and the long-side extending direction of the second light emitting diode 221B is the same as the long-side extending direction of the second light emitting diode 221C.

The second light emitting region 120 includes a plurality of second light emitting units 220, as shown in fig. 14, and the second light emitting units 220 are arranged along the first direction X and the second direction Y, respectively. The plurality of second light emitting units 220 included in the second light emitting region 120 may also be arranged only in the first direction X (not shown). As shown in fig. 7, the plurality of second light emitting units 220 included in the second light emitting unit 120 may also be arranged only in the second direction Y. The second light emitting unit 220 is disposed at the edge area of the backlight module 10 with low light emitting brightness, so as to increase the overall light emitting brightness of the backlight module 10. The embodiment of the present invention does not limit the specific arrangement manner of the plurality of second light emitting units 220.

Further, the second light emitting unit 220 includes a second first light emitting unit 220A and a second light emitting unit 220B that are adjacent to each other, and by arranging the second light emitting elements 221 in the second first light emitting unit 220A and the second light emitting unit 220B in different forms, the diversity of the second light emitting elements 221 in the backlight module 10 is improved, and meanwhile, the brightness of the second light emitting area 120 is improved, so as to ensure the uniformity of the light emitted by the backlight module 10. As shown in fig. 14, the second light emitting unit 220A includes a second light emitting element 221A and a second light emitting element 221B, and the second light emitting unit 220B includes a second light emitting element 221C and a second light emitting element 221D. Specifically, the arrangement direction of the second first light emitting element 221A and the second fourth light emitting element 221D is the same, that is, the long-side extending direction of the second first light emitting element 221A is the same as the long-side extending direction of the second fourth light emitting element 221D. The arrangement direction of the second light emitting element 221B and the second third light emitting element 221C is the same, that is, the long-side extending direction of the second light emitting element 221B is the same as the long-side extending direction of the second third light emitting element 221C. The arrangement of the second light emitting elements 221 in the adjacent second light emitting units 220 is not uniform, and the second light emitting elements 221 are variously arranged.

Fig. 15 is a schematic structural diagram of another backlight module according to an embodiment of the present invention, referring to fig. 15, in the same second light emitting unit 220, there are two adjacent second light emitting elements 221 with different extending directions of their long sides, and an included angle α between the long sides of the two adjacent second light emitting elements 221 satisfies 0 ° < α <180 °, and an opening of the included angle faces the first light emitting area 110.

Specifically, the two second light emitting elements 221 included in the second light emitting unit 220 may not be arranged in parallel, and an included angle exists between the long sides of the two second light emitting elements 221, and the second light emitting elements 221 with different arrangements are realized by adjusting the size of the included angle. As shown in fig. 15, the opening position where the included angle is located faces the first light emitting area 110, so that the light emitted by the second light emitting element 221 is ensured to diverge near the central area of the backlight module 10 while the light emitting brightness of the second light emitting area 120 is improved, and the light emitting effect of the back module 10 is prevented from being affected due to the overlarge brightness difference at the junction of the first light emitting area 110 and the second light emitting area 120.

Illustratively, the included angle α between the long sides of two adjacent second light emitting elements 221 may be any angle between 0 ° and 180 °, for example, the included angle α may be 30 °, 50 ° or 120 °, that is, the two adjacent second light emitting elements 221 are arranged at an acute or obtuse angle. The included angle α may also be 90 °, i.e. two adjacent second light emitting elements 221 are arranged vertically. The embodiment of the present invention does not specifically limit the included angle α between the long sides of the two second light emitting elements 221.

On the basis of the above embodiment, the backlight module increases the reflection times of the light emitted by the light emitting element by adding the reflection structure, increases the light mixing distance, improves the grid image phenomenon of the backlight module, and further details the setting mode of the reflection structure.

First, the arrangement form of the first reflecting structure will be described in detail.

Fig. 16 is a schematic structural view of another backlight module according to an embodiment of the present invention, and fig. 17 is a schematic sectional structural view of the backlight module shown in fig. 16 along a section line EE', and referring to fig. 16 and 17, the reflective structure 300 includes a first reflective structure 310A, where the first reflective structure 310A is located between two adjacent light emitting units 200; the first reflecting structure 310A includes a first sub-reflecting structure 311A extending in the first direction X and a second sub-reflecting structure 311B extending in the second direction Y, the first sub-reflecting structure 311A and the second sub-reflecting structure 311B being disposed to intersect each other, defining at least a portion of an edge of a region where the light emitting unit 200 is disposed; the first sub-reflection structure 311A and the second sub-reflection structure 311B each include a first reflection wall 310 near one side of the light emitting unit 200; the first direction X and the second direction Y intersect and are both parallel to the plane of the substrate 100.

Specifically, the first reflecting structure 310A is located between two adjacent light emitting units 200, and reflects the light emitted by the light emitting units 200. The first reflecting structure 310A includes a first sub-reflecting structure 311A and a second sub-reflecting structure 311B, where the first sub-reflecting structure 311A and the second sub-reflecting structure 311B are disposed to intersect and arranged in an array, and a portion of the edge of the light emitting unit 200 is defined. On the one hand, the light emitting direction of the backlight module 10 can be adjusted, for example, more light is emitted to a place with low light emitting brightness of the backlight module 10 after being reflected, which is beneficial to realizing the light emitting uniformity of the backlight module 10, and on the other hand, the first sub-reflection structure 311A and the second sub-reflection structure 311B can block the light crosstalk between two adjacent light emitting units 200, which is beneficial to providing the light emitting contrast of the backlight module 10.

Further, the specific structure of the first reflecting structure 310A is not limited in the embodiment of the present invention, and the first sub-reflecting structure 311A and the second sub-reflecting structure 311B may be separately disposed, that is, the first sub-reflecting structure 311A and the second sub-reflecting structure 311B are independent structures and are respectively located between two adjacent light emitting units 200. Alternatively, the first and second sub-reflection structures 311A and 311B may be integrally provided as a mesh structure, i.e., a mesh structure formed by a plurality of first and second sub-reflection structures 311A and 311B is provided around the light emitting unit 200.

Referring to fig. 16 and 17, the first reflecting wall 310 includes a slope including a plane (not shown) or a curved surface; along the light emitting direction S of the backlight module 10, the widths d1 of the first sub-reflection structure 311A and the second sub-reflection structure 311B decrease.

Specifically, the first reflecting wall 310 may be a plane or a curved surface, and fig. 17 only illustrates the first reflecting wall 310 as a curved surface.

The width d1 of the first sub-reflection structure 311A and the second sub-reflection structure 311B is reduced along the light emitting direction S of the backlight module, that is, the width of the bottom of the first sub-reflection structure 311A and the width of the second sub-reflection structure 311B are larger than the width of the top of the first sub-reflection structure 311A and the second sub-reflection structure 311B, so that the light emitted from the light emitting unit 200 received by the first reflection wall 310 can be reflected upwards, that is, the light emitting from the light emitting unit 200 is reflected towards the side far from the substrate 100, and the light emitting adjustment of the backlight module 10 is realized.

With continued reference to fig. 16 and 17, the first reflective wall 310 includes a curved surface; the first reflective wall 310 includes a first reflective position A1 and a second reflective position A2, the first reflective position A1 is located at a side of the second reflective position A2 near the substrate 100, and the first reflective position A1 is located at a side of the second reflective position A2 near the light emitting unit 200; the included angle between the tangent line at the first reflection position A1 and the plane of the substrate 100 is alpha, and the included angle between the tangent line at the second reflection position A2 and the plane of the substrate 100 is gamma, wherein 0 DEG < beta < gamma is less than or equal to 90 deg.

Specifically, the first reflective wall 310 includes a first reflective position A1 and a second reflective position A2, and the first reflective position A1 is closer to the substrate 100 and closer to the light emitting unit 200 than the second reflective position A2. Further, the included angle β between the tangent line at the first reflective position A1 and the plane where the substrate 100 is located and the included angle γ between the tangent line at the second reflective position A2 and the plane where the substrate 100 is located satisfy 0 ° < β < γ less than or equal to 90 °, that is, the second sub-reflective structure 311B shown in fig. 17 is formed, compared with the first sub-reflective structure and the second sub-reflective structure (not shown in the drawings) where β is greater than γ and a parabolic shape is formed, the scheme in the embodiment of the invention can emit more light rays emitted by the light emitting unit 200 from the vicinity of the first sub-reflective structure 311A and the second sub-reflective structure 311B, increase the light output amount near the first sub-reflective structure 311A and the second sub-reflective structure 311B, reduce the light output amount directly above the light emitting unit 200, further improve the light output uniformity, and improve the poor light output uniformity of the backlight module 10.

In summary, by reasonably setting the shape of the first reflecting structure 310A, it can be ensured that the light reflected by the first reflecting structure 310A exits from the light exit side of the backlight module 10, and more light exits from the vicinity of the first reflecting structure 310A, so as to increase the light exit amount near the first reflecting structure 310A, reduce the light exit amount right above the light emitting unit 200, and further improve the light exit uniformity.

With continued reference to fig. 16 and 17, the first reflective structure 310A further includes a reflective bottom surface 311, and an opening F is formed in the reflective bottom surface 311, through which the light emitting element 200 is electrically connected to the substrate 100; the angle between the first reflective wall 310 and the reflective bottom 311 is a chamfer θ1.

Specifically, the first reflecting structure 310A further includes a reflecting bottom surface 311, and the reflecting bottom surface 311 further reflects the light emitted by the light emitting unit 200 and reflected to one side of the substrate 100, so as to increase the light mixing distance of the light emitted by the light emitting unit 200 in the backlight module 10.

Illustratively, as shown in fig. 17, the reflective bottom 311 has an opening F formed therein, and the light emitting element 200 is electrically connected to the substrate 100 through the opening F, effectively increasing the reflective area of the first reflective structure 310A, while the substrate provides the light emission driving signal to the light emitting unit 200. The included angle between the first reflecting wall 310 and the reflecting bottom 311 is the chamfer θ1, which can ensure the uniform transition of the light emitted by the light emitting unit 200, and improve the overall light uniformity of the backlight module 10.

With continued reference to fig. 16 and 17, the first reflective structure 310A includes a first a reflective wall 310C and a first b reflective wall 310D, and the first a reflective wall 310C and the first b reflective wall 310D face the light emitting units 200 at both sides of the first reflective structure 310A, respectively; the angle between the first reflective wall 310C and the first second reflective wall 310D is a chamfer θ2.

Specifically, the first reflecting structure 310A includes a first reflecting wall 310C and a first second reflecting wall 310D, as shown in fig. 17, the first reflecting wall 310C and the first second reflecting wall 310D are respectively located at two sides of the second sub-reflecting structure 311B and are close to the light emitting unit 200, so as to reflect the light emitted by the light emitting unit 200, and increase the light mixing distance of the middle light of the backlight module 10. The included angle between the first reflective wall 310C and the first second reflective wall 310D is a chamfer θ2, and by setting the chamfer θ2, the contact of the first reflective wall 310C and the first second reflective wall 310D is an angled smooth surface, so as to avoid damaging the optical film layer above the backlight module 10.

Fig. 18 is a schematic cross-sectional structure of the backlight module shown in fig. 17 along a cross-sectional line GG', and referring to fig. 16 to 18, a slot 312 is disposed on a side of the first sub-reflection structure 311A and/or the second sub-reflection structure 311B away from the substrate 100, and a depth h1 of the slot 312 is smaller than a maximum thickness h2 of the first reflection structure 310A.

Specifically, the side, far away from the substrate 100, of the first sub-reflection structure 311A and/or the second sub-reflection structure 311B is provided with a slot 312, light emitted by the light emitting unit 200 can be reflected in the slot 312, the light emitting quantity of the area where the first sub-reflection structure 311A and/or the second sub-reflection structure 311B are arranged is increased, the light emitting brightness of the area where the first sub-reflection structure 311A and/or the second sub-reflection structure 311B are arranged is increased, the light emitting uniformity of the backlight module 10 is improved, and dark edges caused by no light in the area where the first sub-reflection structure 311A and the second sub-reflection structure 311B are arranged are avoided, thereby influencing the light emitting effect of the backlight module 10. Further, the depth h1 of the slot 312 is smaller than the maximum thickness h2 of the first reflective structure 310A, so that the slot 312 is ensured not to generate larger crosstalk of light rays emitted by different light emitting units 200, and the light emitting contrast ratio of different areas of the backlight module 10 is improved.

Next, an arrangement form of the second reflecting structure will be described.

Referring to fig. 16 and 17, the reflective structure 300 further includes a second reflective structure 320A located at an edge region of the backlight module 10, the second reflective structure 320A defining a light emitting region of the backlight module 10; the second reflection structure 320A includes a second reflection wall 320 near one side of the light emitting unit 200.

Specifically, as shown in fig. 16, the backlight module 10 defines the light emitting unit 200 setting position based on the second reflection structure 320A and the first reflection structure 310A. The first reflective structure 310A defines at least a portion of an edge of the light emitting unit 200 disposed area, the second reflective structure 320A is located at the edge area of the backlight unit 10, the second reflective structure 320A includes a second reflective wall 320, and the disposed position of the light emitting unit 200 is further defined by the first reflective wall 310 and the second reflective wall 320. The light emitted by the light emitting unit 200 passes through the first reflecting wall 310 and the second reflecting wall 320, so that the light emitted by the light emitting unit 200 is reflected, the light mixing distance of the light emitted by the light emitting unit 200 is increased, and the overall light emitting uniformity of the backlight module 10 is improved.

Referring to fig. 16 and 17, the second reflection wall 320 includes a slope including a plane or a curved surface; along the light emitting direction of the backlight module 10, the width d2 of the second reflective structure 320A decreases.

Specifically, the second reflecting wall 320 may be a plane or a curved surface, and fig. 17 only illustrates the second reflecting wall 320 as a curved surface.

The width d2 of the second reflective structure 320A is reduced along the light emitting direction S of the backlight module, that is, the width of the bottom of the second reflective structure 320A is greater than the width of the top, so that the light emitted by the light emitting unit 200 received by the second reflective wall 320 is reflected upwards, that is, the light emitted by the light emitting unit 200 is reflected towards the side far away from the substrate 100, and the light emitting adjustment of the backlight module 10 is implemented, and fig. 17 illustrates the reduction of the width d1 of the second reflective structure 320A.

Referring to fig. 16 and 17, the second reflection wall 320 includes a curved surface; the second reflective wall 320 includes a third reflective position B1 and a fourth reflective position B2, the third reflective position B1 being located at a side of the fourth reflective position B2 near the substrate 100 and the third reflective position B1 being located at a side of the fourth reflective position B2 near the light emitting unit 200; the included angle between the tangent line at the third reflective position B1 and the plane of the substrate 100 is delta, and the included angle between the tangent line at the fourth reflective position B2 and the plane of the substrate 100 is epsilon, wherein delta < epsilon is less than or equal to 90 degrees.

Specifically, the second reflective wall 320 includes a third reflective position B1 and a fourth reflective position B2, and the third reflective position B1 is closer to the substrate 100 and closer to the light emitting unit 200 than the fourth reflective position B2. Further, the included angle δ between the tangent line at the third reflective position B1 and the plane of the substrate 100 and the included angle ε between the tangent line at the fourth reflective position B2 and the plane of the substrate 100 satisfy 0 ° < δ < ε less than or equal to 90 °, that is, a second reflective structure 320A as shown in fig. 17 is formed. By reasonably setting the shape of the second reflecting structure 320A, light reflected by the second reflecting structure 320A can be ensured to exit from the light exit side of the backlight module 10, more light is ensured to exit from the vicinity of the second reflecting structure 320A, the light exit amount near the second reflecting structure 320A is increased, the light exit amount right above the light emitting unit 200 is reduced, and the light exit uniformity is further improved.

With continued reference to fig. 17, the second reflective structure 320A includes a glue frame 321 and a reflective sheet 322 disposed on a side of the glue frame 321 adjacent to the light emitting unit 200.

As shown in fig. 17, the second reflective structure 320A includes a plastic frame 321, where the plastic frame 321 can support the optical film above the backlight module on one hand, and can adhere the optical film to the substrate 100 on the other hand, so as to ensure that the overall stability of the backlight module is good. Meanwhile, the second reflecting structure 320A further comprises a reflecting sheet 322, the reflecting sheet 322 is attached to the second reflecting wall 320, so that light emitted by the light emitting unit 200 can be reflected when passing through the second reflecting structure 320A, the edge light emitting quantity of the backlight module is improved, and the light emitting uniformity is improved.

In summary, by setting the first reflecting structure and the second reflecting structure, and reasonably setting the shapes of the first reflecting structure and the second reflecting structure, the reflection times of the emergent light ray is improved, the light mixing distance is improved, and the emergent light effect of the backlight module can be provided and the emergent light uniformity is ensured to be good on the basis of realizing the thin design of the backlight module.

Fig. 19 is a schematic cross-sectional view of the backlight module shown in fig. 16 along a section line EE', and referring to fig. 16 and 19, the backlight module 10 further includes an optical film 400 located on a side of the first reflective structure 310A away from the substrate 100; the optical structure 410 comprises a plurality of reflection dots 411, the reflection dots 411 form a reflection area H1, and a light transmission area H2 is formed in an area between two adjacent reflection dots 411; the light emitting unit 200 and the first reflective structure 310A at least partially surrounding the light emitting unit 200 form a first region K; along the light emitting direction S of the backlight module 10, the optical structure 410 at least partially overlaps the first region K.

Specifically, the optical film 400 includes a diffusion plate, a diffusion sheet, a brightness enhancement film, etc. (not shown) for enhancing the light emitting effect of the backlight module 10. The optical structure 410 includes a plurality of reflective dots 411, the reflective dots 411 are arranged on the optical film 400 in a gap manner, the reflective dots 411 form a reflective area H1, and a light-transmitting area H2 is formed between two adjacent reflective dots 411. The light emitting unit 200 and the surrounding first reflective structure 310A form a first region K in which the emitted light of the light emitting unit 200 is continuously reflected. The optical structure 410 and the first region K have an overlapping region, so that light emitted by the light emitting unit 200 is ensured to exit in the light transmitting region H2.

Specifically, in the first region K, the light emitted by the light emitting unit 200 is reflected by the reflection region H1, and the reflected light exits from the light transmission region H2, so that the light mixing distance of the light emitted by the light emitting unit 200 is further increased, and meanwhile, the brightness of the region where the eyes of the light emitting unit 200 are located can be reduced, the brightness of the light transmission region H2 is increased, the brightness difference is reduced, the problem of uneven brightness is further improved, the light emitting uniformity of the backlight module 10 is improved, and the phenomenon of stars is avoided.

In the starlike phenomenon, other areas except for the area where the eyes of the light emitting unit 200 are located are brighter, which may be referred to as a bright area and a dark area, respectively, and the brightness of the dark area is lower the farther from the bright area, i.e., the brightness of the area near the center of the gap area is lower than the brightness of the area far from the center of the gap area. In order to further reduce the brightness difference and improve the uniformity of light output, the embodiments of the present invention design the arrangement of the reflective dots 411 in the optical structure 410, and the arrangement of the optical structure 410 is described below.

Fig. 20 is a schematic cross-sectional structure of the backlight module shown in fig. 19 along a section line MM', and referring to fig. 19 and 20, the optical structure 410 includes a first optical area 410A, a second optical area 410B, and a third optical area 410C; the first region K includes a light emitting unit setting region K1, an intermediate region K2 of the light emitting unit 200 and the first reflective structure 310A, and a first reflective structure setting region K3; along the light emitting direction S of the backlight module 10, the first optical area 410A at least partially overlaps the light emitting unit setting area K1, the second optical area 410B at least partially overlaps the intermediate area K2, and the third optical area 410C at least partially overlaps the first reflective structure setting area K3; the first optical zone 410A, the second optical zone 410B, and the third optical zone 410C each include a plurality of reflective dots 411; the sum of the coverage areas of the reflective dots 411 in the first optical region 410A is greater than the sum of the coverage areas of the reflective dots 411 in the second optical region 410B per unit area, and the sum of the coverage areas of the reflective dots 411 in the second optical region 410B is greater than the sum of the coverage areas of the reflective dots 411 in the third optical region 410C.

For convenience of explanation, the optical structure 410 is divided into a first optical area 410A, a second optical area 410B, and a third optical area 410C, the first area K is divided into a light emitting unit setting area K1, a middle area K2, and a first reflective structure setting area K3, and by further dividing the optical structure 410 and the first area K, as shown in fig. 19, the optical structure 410 and the first area K are at least partially overlapped in the light emitting direction S of the backlight unit 10.

Specifically, the first optical area 410A partially overlaps the light-emitting unit setting area K1, so that the light emitted by the light-emitting unit 200 passes through the reflective dots 411 on the first optical area 410A, the number of reflection times of the light is increased, the optical path length is increased, and meanwhile, the optical film 400 at the position where the light is directly reflected at the light-emitting unit 200 is avoided, and the problem of displaying a starry sky is avoided. The second optical area 410B partially overlaps the intermediate area K2, so that the light passing through the light emitting unit 200 and the first reflecting structure 310A passes through the reflecting dots 411 on the second optical area 410B, and the number of reflection times of the light is increased to increase the optical path length. The third optical area 410C partially overlaps the first reflective structure setting area K3, so that the light passing through the first reflective structure 310A passes through the reflective dots 411 on the third optical area 410C, and the number of reflection times of the light is increased to increase the optical path length.

Further, the light emitting brightness at the light emitting unit setting region K1 is higher than the light emitting brightness at the middle region K2, the light emitting brightness at the middle region K2 is higher than the light emitting brightness at the first reflective structure setting region K3, and the light emitting brightness uniformity of different regions is ensured by different setting modes of the reflective dots 411 in the first optical region 410A, the second optical region 410B and the third optical region 410C overlapped with the light emitting unit setting region K1, the middle region K2 and the first reflective structure setting region K3, so that the overall light emitting uniformity of the backlight module 10 is improved. Illustratively, the sum of the areas covered by the reflective dots 411 in the first optical region 410A is the largest, the sum of the areas covered by the reflective dots 411 in the second optical region 410B is the smallest, and the sum of the areas covered by the reflective dots 411 in the third optical region 410C is the smallest, in unit area. Specifically, by setting different coverage areas of the reflective dots 411, different reflection times of emitted light are realized, and brightness of the emitted light in different areas is regulated.

Fig. 21 is a schematic cross-sectional view of the backlight module shown in fig. 19 along a section line MM', and referring to fig. 19 to 21, the distribution density of the reflective dots 411 in the first optical area 410A is greater than the distribution density of the reflective dots 411 in the second optical area 410B; and/or the footprint of the reflective dots 411 in the first optical region 410A is greater than the footprint of the reflective dots 411 in the second optical region 410B; the distribution density of reflective dots 411 in the second optical region 410B is greater than the distribution density of reflective dots 411 in the third optical region 410C; and/or the footprint of the reflective dots 411 in the second optical region 410B is greater than the footprint of the reflective dots 411 in the third optical region 410C.

Specifically, the maximum coverage area of the reflective dots 411 in the first optical area 410A, the sum of the coverage areas of the reflective dots 411 in the second optical area 410B, and the sum of the coverage areas of the reflective dots 411 in the third optical area 410C may be achieved in a unit area by adjusting the distribution density of the reflective dots 411, the area size of the reflective dots 411, or both.

As shown in fig. 21, the distribution density of the reflective dots 411 in the first optical area 410A is greater than the distribution density of the reflective dots 411 in the second optical area 410B, and the distribution density of the reflective dots 411 in the second optical area 410B is greater than the distribution density of the reflective dots 411 in the third optical area 410C, so that the reflective dots 411 are arranged on the optical film 400 in a dense-in-dense-out-sparse manner. As shown in fig. 20, in the unit area, the coverage area of the reflective dots 411 in the first optical area 410A is larger than the coverage area of the reflective dots 411 in the second optical area 410B, and the coverage area of the reflective dots 411 in the second optical area 410B is larger than the coverage area of the reflective dots 411 in the third optical area 410C, so that the light can reflect more light emitted by the light emitting unit 200 in the first optical area 410A, the brightness of the area where the light eye of the light emitting unit 200 is located can be reduced, the brightness of the area where the light eye far from the light emitting unit 200 is located can be improved, thereby reducing the brightness difference and improving the uniformity of the emitted light.

Referring to fig. 20 and 21, the sum of the coverage areas of the reflective dots 411 per unit area decreases in the direction in which the center of the optical structure 410 points to the edge of the optical structure 410.

Illustratively, as shown in FIG. 20, the area of the reflective dots 411 at the center of the optical structure 410 is greater than the area of the reflective dots 411 at the edges. The sum of the areas of the reflective dots 411 at the center of the optical structure 410 is greater than the sum of the areas of the reflective dots 411 at the edges in a unit area. As shown in fig. 21, in the unit area, the sum of the distribution densities of the reflective dots 411 at the center of the optical structure 410 is greater than the sum of the distribution densities of the reflective dots 411 at the edges, so that the brightness of the area where the light-emitting unit eyes are located can be reduced, and the brightness of the area far from the light-emitting unit eyes is improved, thereby reducing the brightness difference and improving the uniformity of light emission.

Referring to fig. 19, a surface of the optical film 400, which is remote from the substrate 100, is provided with a roughening structure 420.

Specifically, the optical film 400 is disposed on a side of the substrate 100 near the optical structure 410, and reflects the light emitted by the light emitting unit 200. The light module 400 is provided with the roughening structure 420 at a side far away from the substrate 100, so that the display problem of atomization of the backlight module is solved, and the light emitting effect of the backlight module is improved. Illustratively, the roughened structure 420 may be prepared by grit blasting the surface of the optical film 400.

Based on the same inventive concept, the embodiment of the invention also provides a display device, which comprises the display panel described in the above embodiment. Specifically, fig. 22 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 22, a display device 1 includes a backlight module 10.

Therefore, the display device 1 provided in the embodiment of the present invention has the technical effects of the technical solution in any of the above embodiments, and the same or corresponding structures and explanations of terms as those of the above embodiments are not repeated herein. The display device 1 provided in the embodiment of the present invention may be a mobile phone as shown in fig. 22, or any electronic product with a display function, including but not limited to the following categories: television, notebook computer, desktop display, tablet computer, digital camera, smart bracelet, smart glasses, vehicle-mounted display, medical equipment, industrial control equipment, touch interactive terminal, etc., which are not particularly limited in this embodiment of the invention.

Note that the above is only a preferred embodiment of the present invention and the technical principle applied. Those skilled in the art will appreciate that the invention is not limited to the specific embodiments described herein, and that features of the various embodiments of the invention may be partially or fully coupled or combined with each other and may be co-operated and technically driven in various ways. Various obvious changes, rearrangements, combinations and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims

1. The backlight module is characterized by comprising a substrate and a plurality of light-emitting units positioned on one side of the substrate;

the light emitting units comprise a plurality of first light emitting units positioned in the first light emitting area and a plurality of second light emitting units positioned in the second light emitting area, the first light emitting units comprise at least one first light emitting element, the second light emitting units comprise at least one second light emitting element, and the arrangement modes of the first light emitting element and the second light emitting element are different;

the reflecting structure comprises a first reflecting structure, and the first reflecting structure is positioned between two adjacent light emitting units; the first reflecting structure comprises a first sub-reflecting structure extending along a first direction and a second sub-reflecting structure extending along a second direction, the first sub-reflecting structure and the second sub-reflecting structure are arranged in a crossing manner, and at least part of edges of the light emitting unit arrangement area are limited; the first sub-reflecting structure and the second sub-reflecting structure comprise a first reflecting wall close to one side of the light emitting unit; the first direction and the second direction intersect and are parallel to the plane where the substrate is located;

And a slot is formed in one side, away from the substrate, of the first sub-reflection structure and/or the second sub-reflection structure, and the depth of the slot is smaller than the maximum thickness of the first reflection structure.

2. A backlight module according to claim 1, wherein the second light emitting area comprises at least a corner region of the backlight module.

3. A backlight module according to claim 2, wherein the second light emitting area further comprises at least one edge area of the backlight module.

4. A backlight module according to claim 2, wherein the second light emitting area further comprises a middle area of at least one edge of the backlight module.

5. A backlight module according to any of claims 1-4, wherein the distribution density of the first light emitting elements is smaller than the distribution density of the second light emitting elements, and/or the extension direction of the long sides in the first light emitting elements is different from the extension direction of the long sides in the second light emitting elements.

6. The backlight module according to claim 5, wherein a distribution density of the first light emitting elements is smaller than a distribution density of the second light emitting elements;

The second light emitting unit includes at least two second light emitting elements.

7. A backlight module according to claim 6, wherein the two second light emitting elements are different in the extending direction of the long sides in the same second light emitting unit.

8. A backlight module according to claim 7, wherein a plurality of the second light emitting units are arranged along a first direction and/or a second direction, and the first direction and the second direction intersect and are parallel to a plane on which the substrate is located;

the two second light emitting units adjacently arranged along the first direction comprise a second first light emitting unit and a second light emitting unit, the second first light emitting unit comprises a second first light emitting element and a second light emitting element, the second light emitting unit comprises a second third light emitting element and a second fourth light emitting element, the second first light emitting element and the second light emitting element are sequentially arranged along the first direction, the second light-emitting elements and the second light-emitting elements are sequentially arranged along the first direction, the long-side extending direction of the second light-emitting element A is the same as the long-side extending direction of the second light-emitting element B, and the long-side extending direction of the second light-emitting element B is the same as the long-side extending direction of the second light-emitting element A.

9. A backlight module according to claim 7, wherein in the same second light emitting unit, there are two adjacent second light emitting elements having different extending directions of their long sides, and an included angle α between the long sides of the two adjacent second light emitting elements satisfies 0 ° < α <180 °, and an opening of the included angle faces the first light emitting region.

10. The backlight module according to claim 1, wherein the first reflective wall comprises a slope, the slope comprising a plane or a curved surface;

and the widths of the first sub-reflecting structure and the second sub-reflecting structure are reduced along the light emitting direction of the backlight module.

11. The backlight module according to claim 10, wherein the first reflective wall comprises a curved surface;

the first reflecting wall comprises a first reflecting position and a second reflecting position, the first reflecting position is positioned at one side of the second reflecting position close to the substrate, and the first reflecting position is positioned at one side of the second reflecting position close to the light emitting unit;

and the included angle between the tangent line at the first reflecting position and the plane of the substrate is beta, and the included angle between the tangent line at the second reflecting position and the plane of the substrate is gamma, wherein 0 degrees < beta < gamma is less than or equal to 90 degrees.

12. The backlight module according to claim 1, wherein the first reflective structure further comprises a reflective bottom surface having an opening formed therein, the light emitting unit being electrically connected to the substrate through the opening;

the included angle between the first reflecting wall and the reflecting bottom surface is a chamfer angle.

13. The backlight module according to claim 1, wherein the first reflecting structure comprises a first reflecting wall and a first second reflecting wall, and the first reflecting wall and the first second reflecting wall face the light emitting units on two sides of the first reflecting structure respectively;

and an included angle between the first reflecting wall and the first second reflecting wall is a chamfer angle.

14. A backlight module according to claim 1, wherein the reflective structure comprises a second reflective structure located at an edge region of the backlight module, the second reflective structure defining a light emitting region of the backlight module; the second reflecting structure comprises a second reflecting wall close to one side of the light emitting unit.

15. The backlight module according to claim 14, wherein the second reflective wall comprises a slope, the slope comprising a plane or a curved surface;

And the width of the second reflecting structure is reduced along the light emitting direction of the backlight module.

16. The backlight module according to claim 15, wherein the second reflective wall comprises a curved surface;

the second reflection wall comprises a third reflection position and a fourth reflection position, the third reflection position is positioned at one side of the fourth reflection position close to the substrate, and the third reflection position is positioned at one side of the fourth reflection position close to the light emitting unit;

the included angle between the tangent line at the third reflecting position and the plane of the substrate is delta, and the included angle between the tangent line at the fourth reflecting position and the plane of the substrate is epsilon, wherein delta < epsilon is less than or equal to 90 degrees.

17. The backlight module according to claim 14, wherein the second reflective structure comprises a plastic frame and a reflective sheet positioned on a side of the plastic frame close to the light emitting unit.

18. The backlight module according to claim 1, further comprising an optical film on a side of the first reflective structure away from the substrate;

a plurality of optical structures are arranged on the surface of one side, close to the substrate, of the optical die, each optical structure comprises a plurality of reflection lattice points, the reflection lattice points form a reflection area, and a light transmission area is formed in an area between two adjacent reflection lattice points;

The light emitting unit and a first reflective structure at least partially surrounding the light emitting unit form a first region;

along the light emitting direction of the backlight module, the optical structure at least partially overlaps the first region.

19. The backlight module of claim 18, wherein the optical structure comprises a first optical area, a second optical area, and a third optical area;

the first area comprises a light emitting unit setting area, a middle area of the light emitting unit and the first reflecting structure and a first reflecting structure setting area;

along the light emitting direction of the backlight module, the first optical area at least partially overlaps the light emitting element setting area, the second optical area at least partially overlaps the middle area, and the third optical area at least partially overlaps the first reflective structure setting area;

the first optical region, the second optical region, and the third optical region each comprise a plurality of the reflective dots; in unit area, the sum of the coverage areas of the reflective dots in the first optical area is larger than the sum of the coverage areas of the reflective dots in the second optical area, and the sum of the coverage areas of the reflective dots in the second optical area is larger than the sum of the coverage areas of the reflective dots in the third optical area.

20. The backlight module of claim 19, wherein the distribution density of the reflective mesh points in the first optical area is greater than the distribution density of the reflective mesh points in the second optical area; and/or the coverage area of the reflective dots in the first optical region is greater than the coverage area of the reflective dots in the second optical region;

the distribution density of the reflection net points in the second optical area is greater than the distribution density of the reflection net points in the third optical area; and/or the coverage area of the reflective dots in the second optical region is greater than the coverage area of the reflective dots in the third optical region.

21. A backlight module according to claim 18, wherein the sum of the coverage areas of the reflective dots per unit area decreases in a direction in which the center of the optical structure points to the edge of the optical structure.

22. A backlight module according to claim 18, wherein a surface of the optical film away from the substrate is provided with a roughened structure.

23. A display device comprising a backlight module according to any one of claims 1-22.