CN114253029A

CN114253029A - Backlight module and display device

Info

Publication number: CN114253029A
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: 2022-03-29
Anticipated expiration: 2041-12-21
Also published as: CN114253029B

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 also comprises a reflecting structure, wherein the reflecting structure comprises a reflecting wall close to one side of the light-emitting unit; the backlight module also 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 unit comprises a plurality of first light emitting units positioned in a first light emitting area and a plurality of second light emitting units positioned in a 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 first light emitting element and the second light emitting element are arranged in different modes. The backlight module provided by the embodiment of the invention can improve the reflection times of light 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 setting modes on the light emitting elements in 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 mode, a series of light emitting problems can occur due to the limitation of optical characteristics of a light source.

Disclosure of Invention

The embodiment of the invention provides a backlight module and a display device, which solve 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 reflection 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 on one side of the substrate;

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

the backlight module also 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 unit comprises 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 unit comprises at least one first light emitting element, the second light emitting unit comprises at least one second light emitting element, and the first light emitting element and the second light emitting element are arranged in different modes.

In a second aspect, an embodiment of the present invention further provides a display device, where the display device 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 reflection structure at one side close to the reflection 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, the backlight module is provided with the plurality of light-emitting units in the first light-emitting area and the second light-emitting area, the first light-emitting unit is provided with the at least one first light-emitting element, the second light-emitting unit is provided with the at least one second light-emitting element, the light-emitting uniformity of the backlight module is ensured by regulating and controlling the setting modes of the first light-emitting element and the second light-emitting element, and the display defects of halation and lamp shadow are avoided.

Drawings

In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, a brief description is given below of the drawings used in describing the embodiments. It should be clear that the described figures are only views of some of the embodiments of the invention to be described, not all, and that for a person skilled in the art, other figures can be derived from these figures without inventive effort.

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

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

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

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

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

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

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

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

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

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

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

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

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

FIG. 17 is a 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 a section line GG';

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

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

FIG. 21 is a 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 clearer, the technical solutions of the present invention will be fully described by the detailed description with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without inventive efforts fall within the scope of the present invention.

Fig. 1 is a schematic structural diagram of a backlight module in the prior art, and fig. 2 is a schematic structural diagram of a cross-section 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 backlight module 01 'can be thinned by reducing the distance d' between the substrate 10 'and the light emitting film 30'. However, reducing d ' may result in insufficient light mixing distance of the light emitted from the light emitting unit 20', which may affect the contrast of the light emitted from the backlight module 01', and may cause display defects such as lamp shadow and halo. As shown in the arrangement of the light emitting units 20' in fig. 1, the brightness of the light emitted from the edge region of the backlight module 01' is lower than the brightness of the light emitted from the center region, and the uniformity of the light emitted from the backlight module 01' is poor.

Based on the above technical problem, an embodiment of the present invention provides a backlight module, which includes a substrate and a plurality of light emitting units located on one side of the substrate; the backlight module also comprises a reflecting structure, wherein the reflecting structure comprises a reflecting wall close to one side of the light-emitting unit; the backlight module also 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 unit comprises a plurality of first light emitting units positioned in a first light emitting area and a plurality of second light emitting units positioned in a 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 first light emitting element and the second light emitting element are arranged in different modes. By adopting the technical scheme, the reflection structure is arranged around the light-emitting unit, the reflection times of the light-emitting light is improved, the light mixing distance is increased, the display defects of lamp shadow, halation and the like 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 the arrangement mode, and the integral light-emitting uniformity of the backlight module is ensured.

The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.

Fig. 3 is a schematic structural diagram of a backlight module according to an embodiment of the present invention, fig. 4 is a schematic structural diagram of a cross-section of the backlight module shown in fig. 3 along a section line BB', fig. 5 is a schematic structural diagram 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 on one side of the substrate 100; the backlight module 10 further includes a reflective structure 300, wherein the reflective structure 300 includes a reflective wall 310 adjacent to 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, and is electrically connected to the light emitting unit 200 for providing a light emitting 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 Mini LEDs, Micro LEDs, and other electronic elements, and serves as a light source of the backlight module 10. Because electronic components such as Mini LEDs or Micro LEDs have small volumes, 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 include Mini LEDs or Micro LEDs, which is favorable for realizing refined 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 reflective structure 300 includes a reflective wall 310, the reflective wall 310 is close to one side of the light emitting unit 200, and the light emitted from the light emitting unit 300 is reflected by the reflective wall 310. The reflection structure 300 is used to increase the optical path of the light emitted from the light emitting unit 200, so as to increase the light mixing distance of the emitted light, which is beneficial to the realization of the thinned backlight module 10. The display defect that lamp shadow and halation appear in backlight unit among the prior art can be effectively solved. The backlight module 10 provided by the embodiment of the invention further improves the uniformity of the light emitted from the backlight module 10 and the overall light emitting effect of the backlight module 10 by arranging different light emitting areas.

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 at an edge region of the backlight module 10, the first light emitting area 110 is located at a central region 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 arranging a plurality of light emitting units 200 in the first light emitting region 110 and the second light emitting region 120, the light emitting brightness of the edge region and the central region 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, 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 setting the first light emitting elements 211 and the second light emitting elements 221 differently, the brightness requirement of the edge region and the brightness requirement of the central region in the backlight module 10 can be satisfied respectively.

Specifically, the brightness requirement of the edge region and the brightness requirement of the central region in the backlight module 10 can be satisfied by setting different numbers of the first light emitting elements 211 and the second light emitting elements 221. For example, as shown in fig. 3, the first light-emitting unit 210 includes one 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 second light-emitting elements 221 in the backlight module 10 is not specifically limited in the embodiment of the present invention. The backlight module 10 provided by the embodiment of the invention can ensure that the difference between the luminance of the central area and the luminance of the edge area of the backlight module 10 is small by setting the number difference between the first light-emitting elements 211 and the second light-emitting elements 221, thereby improving the overall light-emitting effect of the backlight module 10. Or, in the backlight module 10, the specific arrangement of the first light emitting elements 211 and the second light emitting elements 221 may be different, as shown in fig. 5, the long sides of the first light emitting elements 211 extend along the X direction, and the long sides of the second light emitting elements 221 extend along the Y direction, that is, the difference in the distribution form of the first light emitting elements 211 and the second light emitting elements 221 realizes the diversity of the arrangement of the first light emitting elements 211 and the second light emitting elements 221, and meets different types of backlight modules 10.

In summary, according to the backlight module provided by the embodiment of the invention, the reflection structures are arranged around the light emitting units, so that the reflection times of the emergent light are increased, the light mixing distance is increased, the display defects of lamp shadow and halation are avoided, meanwhile, the number and the arrangement positions of the light emitting elements of the first light emitting area and the second light emitting area are reasonably regulated and controlled, and the integral emergent light uniformity of the backlight module is ensured.

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

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 region 120 at least includes a corner region of the backlight module 10.

Specifically, the second light emitting area 120 at least includes corner areas of the backlight module 10, taking a quadrangle as an example, the second light emitting area 120 is disposed at four corners of the quadrangle; taking a hexagon as an example, the second light emitting region 120 is disposed at six corners of the hexagon. Because the light-emitting brightness of the corner position and other positions in the backlight module is different, the backlight module 10 adjusts the light-emitting brightness of the first light-emitting area 110 and the second light-emitting area 120 by adjusting the arrangement of the light-emitting units 200 in the first light-emitting area 110 and the second light-emitting area 120. Specifically, the light emitting brightness of the corner region of the backlight module 10 is lower than the display brightness of the central region, the second light emitting region 120 may be disposed in the corner region of the backlight module 10, and the light emitting brightness of the second light emitting region 120 is improved by adjusting the arrangement manner of the light emitting units 200 in the second light emitting region 120, so that the uniformity of the light emitting brightness of the backlight module 10 in the corner region and the central region is realized.

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 region 220 further includes at least one edge region of the backlight module 10.

Specifically, the second light emitting region 220 further includes at least one edge region of the backlight module 10, for example, a quadrilateral, and the second light emitting region 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 partially along the edge of the circular arc. Because the light-emitting brightness of the corner position and other positions in the backlight module is different, the backlight module 10 adjusts the light-emitting brightness of the first light-emitting area 110 and the second light-emitting area 120 by adjusting the arrangement of the light-emitting units 200 in the first light-emitting area 110 and the second light-emitting area 120. Specifically, the light-emitting brightness of the edge region of the backlight module 10 is lower than the display brightness of the central region, and the second light-emitting region 120 may be disposed in at least one edge region of the backlight module 10, for example, as shown in fig. 7, the second light-emitting regions 120 are disposed in two edge regions of the backlight module 10. By adjusting the arrangement of the light emitting units 200 in the second light emitting region 120, the light emitting brightness of the second light emitting region 120 is improved, and the uniformity of the light emitting brightness of the backlight module 10 in the edge region and the central region 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 region 220 further includes a middle region of at least one edge of the backlight module 10, and taking a quadrilateral as an example, the second light emitting region 120 includes a middle position of at least one edge of the quadrilateral; taking a hexagon as an example, the second light emitting region 120 includes a middle position of at least one edge of the hexagon. Furthermore, the light emitting brightness of the middle area of the edge of the backlight module 10 is lower than the display brightness of the central area, the second light emitting area 120 can be disposed in the middle area of the edge of the backlight module 10, and the light emitting brightness of the second light emitting area 120 is improved by adjusting the arrangement mode of the light emitting units 200 in the second light emitting area 120, so that the uniformity of the light emitting brightness of the backlight module 10 in the central area of the edge and the central area is realized.

On the basis of the above embodiments, the backlight module has different light emitting luminances in the first light emitting area and the second light emitting area according to different arrangement modes of the first light emitting element and the second light emitting element, and a detailed description is provided below for various arrangement modes of the first light emitting element and the second light emitting element.

Fig. 8 is a schematic structural diagram of another backlight module according to an embodiment of the present invention, fig. 9 is a schematic structural diagram of another backlight module according to an embodiment of the present invention, fig. 10 is a schematic structural diagram of another backlight module according to an embodiment of the present invention, and fig. 11 is a schematic structural diagram of another backlight module according to an embodiment of the present invention, referring to fig. 3 to 11, a distribution density of the first light emitting elements 211 is smaller than a distribution density of the second light emitting elements 221, and/or an extending direction of the long sides of the first light emitting elements 211 is different from an 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 overall 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 light-emitting brightness of the backlight module 10 in the second light-emitting region 120 is lower than the light-emitting brightness in the first light-emitting region 110, and the difference between the light-emitting brightness of the backlight module 10 in the second light-emitting region 120 and the light-emitting brightness of the backlight module 10 in the first light-emitting region 110 is smaller by adjusting the distribution mode of the first light-emitting elements 211 in the first light-emitting region 110 and adjusting the distribution mode of the second light-emitting elements 221 in the second light-emitting region 120, so that the overall light-emitting uniformity of the backlight module 10 is ensured.

Specifically, the distribution density of the first light emitting elements 211 is set to be smaller than the distribution density of the second light emitting elements 221, so that the light emitting brightness of the second light emitting region 220 is improved, and the light emitting brightness of the backlight module 10 in the edge region and the light emitting brightness of the central region are ensured to be inconspicuous. Illustratively, as shown in fig. 3, the second light emitting regions 120 surround all of the first light emitting regions 110, and the density of the second light emitting elements 221 disposed in the second light emitting regions 120 is greater than the density of the first light emitting elements 211 disposed in the first light emitting regions 110. As shown in fig. 6 and 7, the second light emitting region 120 surrounds a part of the first light emitting region 110, and the density of the second light emitting elements 221 provided in the second light emitting region 120 is greater than the density of the first light emitting elements 211 provided in the first light emitting region 110. The embodiment of the present invention does not specifically limit the distribution position of the second light emitting region 120, and does not specifically limit the distribution density of the first light emitting element 211 and the second light emitting element 221.

Specifically, the backlight module 10 may set the extending direction of the long side of the first light emitting element 211 to be different from the extending direction of the long side of the second light emitting element 221, so as to realize the diversity of the setting differences of the first light emitting element 211 and the second light emitting element 221, and meet different types of backlight modules 10. Illustratively, as shown in fig. 5, the long side of the first light emitting element 211 extends in the X direction, and the long side of the second light emitting element 221 extends in the Y direction. As shown in fig. 8, the long side of the first light emitting element 211 extends in the Y direction, and the long side of the second light emitting element 221 extends in the X direction. The embodiment of the present invention does not specifically limit the extending direction of the long sides of the first light emitting element 211 and the second light emitting element 221, and different arrangement modes are set, so as to meet the diversified backlight module 10.

Further, as shown in fig. 9, 10 and 11, the backlight module 10 satisfies both that the distribution density of the first light emitting elements 211 is set to be smaller than that of the second light emitting elements 221, and that 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 elements 211 and the distribution density of the second light-emitting elements 221, the light-emitting brightness of the first light-emitting areas 110 and the light-emitting brightness of the second light-emitting areas 120 are adjusted, the overall light-emitting uniformity of the backlight module 10 is ensured, and meanwhile, the long edge arrangement mode of the first light-emitting elements 211 and the second light-emitting elements 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 less 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.

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

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

Fig. 12 is a schematic structural diagram of another backlight module according to an embodiment of the present invention, and fig. 13 is a schematic structural diagram 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, the extending directions of the long sides of two second light emitting elements 221 are different.

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 region 120, and meet the requirements of different types of backlight modules 10.

Exemplarily, as shown in a region C in 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 area D in fig. 12, the two second light emitting elements 221 in the second light emitting unit 220 are distributed in different manners, that is, the extending directions of the long sides of the two second light emitting elements 221 are not the same, and by arranging the second light emitting elements 221 in multiple types, the light emitting brightness of the second light emitting unit 220 at different positions is increased, and the light emitting brightness of the second light emitting region 120 is further improved.

Fig. 14 is a schematic structural view of another backlight module according to an embodiment of the invention, 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 where the substrate 100 is located; two second light emitting units 220 adjacently disposed in the first direction X include a second light emitting unit 220A and a second light emitting unit 220B, the second light emitting unit 220A includes a second light emitting element 221A and a second light emitting element 221B, the second light emitting unit 220B includes a second first light emitting element 221C and a second light emitting element 221D, the second light emitting element 221A and the second light emitting element 221B are sequentially arranged in the first direction X, the second first light emitting element 221C and the second light emitting element 221D are sequentially arranged in the first direction Y, and a long side extending direction of the second light emitting element 221A is the same as a long side extending direction of the second light emitting element 221D, and a long side extending direction of the second light emitting element 221B is the same as a long side extending direction of the second first light emitting element 221C.

Wherein the second light emitting region 120 includes a plurality of second light emitting units 220, as shown in fig. 14, the second light emitting units 220 are respectively arranged along the first direction X and the second direction Y. The second light emitting regions 120 may further include a plurality of second light emitting units 220 arranged only along 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 in the edge region of the backlight module 10 with low luminance, so as to improve the overall luminance of the backlight module 10. The embodiment of the 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 light emitting unit 220A and a second light emitting unit 220B adjacent to each other, and the second light emitting elements 221 in the second light emitting unit 220A and the second light emitting unit 220B are arranged in different forms, so that the diversity of the arrangement of the second light emitting elements 221 in the backlight module 10 is improved, and simultaneously, the brightness of the second light emitting area 120 is improved, and the uniformity of the light emitting of the backlight module 10 is ensured. 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 propylene light emitting element 221C and a second light emitting element 221D. Specifically, the second light emitting element 221A and the second light emitting element 221D are arranged in the same direction, that is, the direction in which the second light emitting element 221A extends in the long side is the same as the direction in which the second light emitting element 221D extends in the long side. The second light-emitting elements 221B and the second sub light-emitting elements 221C are arranged in the same direction, that is, the longitudinal direction of the second light-emitting elements 221B is the same as the longitudinal direction of the second sub light-emitting elements 221C. The arrangement of the second light emitting elements 221 in the adjacent second light emitting units 220 is not uniform, so that the second light emitting elements 221 are arranged in various ways.

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

Specifically, the two second light emitting elements 221 included in the second light emitting unit 220 may be arranged in a non-parallel manner, an included angle exists between long sides of the two second light emitting elements 221, and the second light emitting elements 221 in different arrangement modes 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 region 110, so that the light emitted by the second light emitting region 221 is ensured to be diffused near the central region of the backlight module 10 while the light emitting brightness of the second light emitting region 120 is improved, and the light emitting effect of the back module 10 is prevented from being affected due to an excessively large brightness difference at the junction between the first light emitting region 110 and the second light emitting region 120.

Illustratively, the included angle α between the long sides of two adjacent second light emitting elements 221 satisfies any one of angles of 0 ° and 180 °, for example, the included angle α may be 30 °, 50 ° or 120 °, that is, two adjacent second light emitting elements 221 are arranged at an acute angle or an obtuse angle. The included angle α may also be 90 °, that is, two adjacent second light emitting elements 221 are vertically distributed and arranged. The included angle α between the long sides of the two second light emitting elements 221 is not limited by a specific value in the embodiment of the present invention.

On the basis of the above embodiments, the backlight module increases the number of times of reflection of light emitted by the light emitting element by adding the reflection structure, increases the light mixing distance, and improves the grid shadow phenomenon of the backlight module, and the following describes the setting form of the reflection structure in detail.

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

Fig. 16 is a schematic structural diagram of another backlight module according to an embodiment of the invention, fig. 17 is a schematic structural diagram of a cross-section of the backlight module shown in fig. 16 along a section line EE', and referring to fig. 16 and fig. 17, the reflective structure 300 includes a first reflective structure 310A, and the first reflective structure 310A is located between two adjacent light-emitting units 200; the first reflective structure 310A includes a first sub-reflective structure 311A extending along a first direction X and a second sub-reflective structure 311B extending along a second direction Y, the first sub-reflective structure 311A and the second sub-reflective structure 311B being arranged to intersect, defining at least a portion of an edge of an arrangement region of the light emitting unit 200; 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 parallel to the plane of the substrate 100.

Specifically, the first reflective structure 310A is located between two adjacent light emitting units 200, and reflects light emitted from the light emitting units 200. The first reflective structure 310A includes a first sub-reflective structure 311A and a second sub-reflective structure 311B, and the first sub-reflective structure 311A and the second sub-reflective structure 311B are disposed in a crossed manner and arranged in an array, defining a partial edge of the light emitting unit 200 disposition region. On one hand, the light emitting direction of the backlight module 10 can be adjusted, for example, more light rays are reflected and emitted to a place with low luminance of the backlight module 10, 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 embodiment of the invention does not limit the specific structure of the first reflective structure 310A, and for example, the first sub-reflective structure 311A and the second sub-reflective structure 311B may be separately disposed, that is, the first sub-reflective structure 311A and the second sub-reflective structure 311B are independent structures and are respectively located between two adjacent light emitting units 200. Alternatively, the first sub-reflective structure 311A and the second sub-reflective structure 311B may also be a mesh structure integrally disposed, that is, a mesh structure formed by a plurality of the first sub-reflective structure 311A and the second sub-reflective structure 311B is disposed around the light emitting unit 200.

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

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

Illustratively, the width d1 of the first sub-reflection structure 311A and the second sub-reflection structure 311B is reduced along the light outgoing direction S of the backlight module, that is, the width of the bottom of the first sub-reflection structure 311A and the second sub-reflection structure 311B is greater than the width of the top, 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 outgoing from the light emitting unit 200 is reflected toward the side far from the substrate 100, and the light outgoing adjustment of the backlight module 10 is achieved, as illustrated in fig. 17 by the reduction of the width d1 of the second sub-reflection structure 311B, compared with a reflection structure with a wide top and a narrow bottom, the first sub-reflection structure 311A and the second sub-reflection structure 311B provided in the embodiments of the present invention can reflect the light outgoing toward the side of the substrate 100, and the light outgoing brightness adjustment can be achieved, the problem of poor light-emitting uniformity is improved.

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 close to the substrate 100, and the first reflective position a1 is located at a side of the second reflective position a2 close to the light emitting unit 200; an included angle between a tangent line at the first reflection position a1 and the plane of the substrate 100 is α, and an included angle between a tangent line at the second reflection position a2 and the plane of the substrate 100 is γ, where β < γ ≦ 90 °.

Specifically, the first reflective wall 310 includes a first reflective position a1 and a second reflective position a2, the first reflective position a1 being closer to the substrate 100 and the light emitting cell 200 than the second reflective position a 2. Furthermore, an included angle β between a tangent line at the first reflection position a1 and the plane of the substrate 100 and an included angle γ between a tangent line at the second reflection position a2 and the plane of the substrate 100 satisfy 0 ° < β < γ ≦ 90 °, that is, the second sub-reflection structure 311B shown in fig. 17 is formed, and compared with the case where β is greater than γ, the parabolic first sub-reflection structure and second sub-reflection structure (not shown in the drawings) are formed.

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

With continued reference to fig. 16 and 17, the first reflective structure 310A further includes a reflective bottom surface 311, an opening F is formed in the reflective bottom surface 311, and the light emitting element 200 is electrically connected to the substrate 100 through the opening F; the included angle between the first reflective wall 310 and the reflective bottom 311 is a chamfer angle θ 1.

Specifically, the first reflective structure 310A further includes a reflective bottom surface 311, and the reflective bottom surface 311 further reflects the light emitted from 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 from the light emitting unit 200 in the backlight module 10.

Exemplarily, as shown in fig. 17, an opening F is formed in the reflective bottom surface 311, and the light emitting element 200 is electrically connected to the substrate 100 through the opening F, so that the reflective area of the first reflective structure 310A is effectively increased, and the substrate provides a light emitting driving signal to the light emitting unit 200. The included angle between the first reflective wall 310 and the reflective bottom 311 is a chamfer angle θ 1, which can ensure the uniform transition of light emitted from the light emitting unit 200, and improve the overall light emitting uniformity of the backlight module 10.

With continued reference to fig. 16 and 17, the first reflective structure 310A includes a first reflective wall 310C and a first second reflective wall 310D, and the first reflective wall 310C and the first second reflective wall 310D respectively face the light emitting units 200 at both sides of the first reflective structure 310A; the included angle between the first a reflective wall 310C and the first b reflective wall 310D is a chamfer θ 2.

Specifically, the first reflective structure 310A includes a first reflective wall 310C and a first second reflective wall 310D, as shown in fig. 17, the first reflective wall 310C and the first second reflective wall 310D are respectively located at two sides of the second sub-reflective structure 311B and close to the light emitting unit 200, and are used for reflecting the light emitted by the light emitting unit 200, so as to increase the light mixing distance of the middle light of the backlight module 10. An included angle between the first reflecting wall 310C and the first second reflecting wall 310D is a chamfer angle θ 2, and by setting the chamfer angle θ 2, the first reflecting wall 310C and the first second reflecting wall 310D are ensured to be contacted with a smooth surface with an angle, so that an optical film layer above the backlight module 10 is prevented from being damaged.

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

Specifically, 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, light emitted by the light emitting unit 200 can be reflected in the slot 312, a light emitting amount of a setting region of the first sub-reflection structure 311A and/or the second sub-reflection structure 311B is increased, a light emitting luminance of the setting region of the first sub-reflection structure 311A and/or the second sub-reflection structure 311B is increased, light emitting uniformity of the backlight module 10 is increased, and a dark edge and an influence on a light emitting effect of the backlight module 10 due to no light in the setting region of the first sub-reflection structure 311A and the second sub-reflection structure 311B are avoided. Furthermore, the depth h1 of the slot 312 is smaller than the maximum thickness h2 of the first reflective structure 310A, so that the situation that the light emitted by different light-emitting units 200 generates large light crosstalk is avoided, and the light-emitting contrast of different areas of the backlight module 10 is improved.

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

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 reflective structure 320A includes a second reflective wall 320 near one side of the light emitting unit 200.

Specifically, as shown in fig. 16, the backlight assembly 10 defines the arrangement position of the light emitting unit 200 based on the second reflective structure 320A and the first reflective structure 310A. The first reflective structure 310A defines at least a portion of an edge of the light emitting unit 200, the second reflective structure 320A is located at an edge region of the backlight assembly 10, the second reflective structure 320A includes a second reflective wall 320, and the first reflective wall 310 and the second reflective wall 320 further define the light emitting unit 200. 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 emitting light of 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 flat surface or a curved surface; the width d2 of the second reflective structure 320A decreases along the light exiting direction of the backlight module 10.

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

Exemplarily, the width d2 of the second reflection structure 320A is reduced along the light exit direction S of the backlight module, that is, the width of the bottom of the second reflection structure 320A is greater than the width of the top, so that the light emitted from the light emitting unit 200 received by the second reflection wall 320 is reflected upward, that is, the light exiting light of the light emitting unit 200 is reflected toward the side away from the substrate 100, so as to achieve the light exit adjustment of the backlight module 10, fig. 17 illustrates that the width d1 of the second reflection structure 320A is reduced, and compared with a reflection structure with a wide top and a narrow bottom, the second reflection structure 320A provided in the embodiment of the present invention can reflect the light exiting light toward the side of the substrate 100, so as to achieve the light exit brightness adjustment and improve the problem of poor light exit uniformity.

Referring to fig. 16 and 17, the second reflective 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 is located at a side of the fourth reflective position B2 close to the substrate 100 and the third reflective position B1 is located at a side of the fourth reflective position B2 close to the light emitting unit 200; an included angle between the tangent line at the third reflection position B1 and the plane of the substrate 100 is δ, and an included angle between the tangent line at the fourth reflection position B2 and the plane of the substrate 100 is ∈, where δ < ≦ 90 °.

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 the light emitting cell 200 than the fourth reflective position B2. Furthermore, an included angle δ between the tangent line at the third reflection position B1 and the plane of the substrate 100 and an included angle ∈ between the tangent line at the fourth reflection position B2 and the plane of the substrate 100 satisfy 0 ° < δ < ∈ 90 °, that is, the second reflection structure 320A shown in fig. 17 is formed, and compared with a case where δ is greater than ∈, a parabolic second reflection structure (not shown in the drawings) is formed. Through the shape that sets up second reflection configuration 320A rationally, can guarantee that the light after the reflection of second reflection configuration 320A is followed the light-emitting side light-emitting of backlight unit 10 to guarantee that more light is followed near the outgoing of second reflection configuration 320A, increase near the light output volume of second reflection configuration 320A, reduce the light output volume directly over luminescence unit 200, further promote the light-emitting homogeneity.

As shown in fig. 17, the second reflective structure 320A includes a plastic frame 321 and a reflective sheet 322 disposed on a side of the plastic frame 321 close to the light emitting unit 200.

For example, as shown in fig. 17, the second reflective structure 320A includes a rubber frame 321, and on one hand, the rubber frame 321 can support an optical film above the backlight module, and on the other hand, the optical film can be adhered to the substrate 100, so as to ensure that the overall stability of the backlight module is good. Meanwhile, the second reflection structure 320A further includes a reflection sheet 322, and the reflection sheet 322 is attached to the second reflection wall 320, so that the light emitted by the light emitting unit 200 can be reflected when passing through the second reflection structure 320A, the light output amount at the edge of the backlight module is increased, and the light output uniformity is improved.

In conclusion, through setting up first reflection configuration and second reflection configuration to the shape that sets up first reflection configuration and second reflection configuration in principle is guaranteeing to improve the reflection number of times of light-emitting light and promoting the mixed light distance, realizes the basis of backlight unit slim design, can also provide backlight unit's light-emitting effect, guarantees that the light-emitting homogeneity is good.

Fig. 19 is a schematic cross-sectional view of the backlight module shown in fig. 16 along a sectional line EE', and referring to fig. 16 and fig. 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; a plurality of optical structures 410 are arranged on one side surface of the optical die 400 close to the substrate 100, each optical structure 410 comprises a plurality of reflective dots 411, the plurality of reflective dots 411 form a reflective region H1, and a region between two adjacent reflective dots 411 forms a light-transmitting region H2; 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; the optical structure 410 at least partially overlaps the first region K along the light-emitting direction S of the backlight module 10.

Specifically, the optical film 400 includes a diffuser plate, a brightness enhancement film (not shown), and the like, for improving 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 an intermittent manner, the reflective dots 411 form a reflective region H1, and a region between two adjacent reflective dots 411 forms a transmissive region H2. The light emitting unit 200 and the surrounding first reflective structure 310A form a first region K, in which light emitted from the light emitting unit 200 is reflected continuously. The overlapping area of the optical structure 410 and the first area K ensures that the light emitted from the light emitting unit 200 exits in the light transmitting region H2.

Specifically, in first region K, the light that light-emitting unit 200 sent reflects through reflection zone H1, the outgoing of reflected light from printing opacity district H2 further promotes the mixed light distance that light-emitting unit 200 sent light, can reduce the luminance in the district that light-emitting unit 200 eyes is located simultaneously, improve printing opacity district H2 luminance, reduce the luminance difference, and then improve the uneven problem of bright dark, improve backlight unit 10's light-emitting homogeneity, avoid appearing the full sky phenomenon.

In the starry phenomenon, the areas other than the areas where the eyes of the light emitting units 200 are located are dark and may be referred to as a bright area and a dark area, respectively, and the areas farther from the bright area in the dark area have lower brightness, i.e., the areas closer to the center of the gap area have lower brightness than the areas farther from the center of the gap area. In order to further reduce the brightness difference and improve the uniformity of the light output, the embodiment of the present invention designs 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 view 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 region 410A, a second optical region 410B and a third optical region 410C; the first region K includes the light emitting unit disposition region K1, the middle region K2 of the optical unit 220 and the first reflective structure 310A, and the first reflective structure disposition region K3; along the light-exiting direction S of the backlight module 10, the first optical region 410A at least partially overlaps the light-emitting unit disposition region K1, the second optical region 410B at least partially overlaps the middle region K2, and the third optical region 410C at least partially overlaps the first reflection structure disposition region K3; first optical zone 410A, second optical zone 410B, and third optical zone 410C each include a plurality of reflective dots 411; in a unit area, the sum of the coverage areas of the reflective dots 411 in the first optical area 410A is greater than 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 second optical area 410B is greater than the sum of the coverage areas of the reflective dots 411 in the third optical area 410C.

For convenience of explanation, the optical structure 410 is divided into a first optical region 410A, a second optical region 410B and a third optical region 410C, the first region K is divided into a light emitting unit disposition region K1, an intermediate region K2 and a first reflection structure disposition region K3, and by further dividing the optical structure 410 and the first region K, as shown in fig. 19, at least partial overlapping of the optical structure 410 and the first region K is achieved along the light emitting direction S of the backlight assembly 10.

Specifically, the first optical area 410A is partially overlapped with 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 times of light reflection is increased, the optical path length is increased, and the display problem of starry sky due to the fact that the light at the light-emitting unit 200 is directly reflected by the optical film 400 is avoided. The second optical area 410B partially overlaps the middle area K2, so that the light passing through the optical unit 220 and the first reflective structure 310A passes through the reflective dots 411 on the second optical area 410B, the number of times of light reflection is increased, and the optical path length is increased. The third optical area 410C partially overlaps the first reflective structure disposition 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, increasing the number of times of light reflection and increasing the optical path length.

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

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 region 410A is greater than that of the reflective dots 411 in the second optical region 410B; and/or the coverage area of the reflective dots 411 in the first optical area 410A is larger than that of the reflective dots 411 in the second optical area 410B; the distribution density of the reflective dots 411 in the second optical area 410B is greater than that of the reflective dots 411 in the third optical area 410C; and/or the coverage area of the reflective dots 411 in the second optical area 410B is larger than that of the reflective dots 411 in the third optical area 410C.

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

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

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

Illustratively, as shown in fig. 20, the area of a reflective dot 411 at the center of an optical structure 410 is larger than the area of the reflective dot 411 at the edges. In a unit area, 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. As shown in fig. 21, in a 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 luminance of the area where the light emitting unit is located can be reduced, and the luminance of the area far away from the light emitting unit is increased, thereby reducing the luminance difference and improving the uniformity of the emitted light.

Referring to fig. 19, a surface of the optical film 400 on a side away from the substrate 100 is provided with a roughened structure 420.

Specifically, the optical structure 410 is disposed on the side of the optical film 400 close to the substrate 100 to reflect the light emitted from the light emitting unit 200. The roughened structure 420 is disposed on a side of the light module 400 away from the substrate 100, so as to solve the display problem of fogging of the backlight module and improve the light emitting effect of the backlight module. Illustratively, the roughened structure 420 may be prepared by sandblasting the surface of the optical film 400.

Based on the same inventive concept, the embodiment of the invention further provides a display device, and the display device comprises the display panel described in the 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 solutions in any of the embodiments, and the structures and terms identical to or corresponding to those in the embodiments are not repeated herein. The display device 1 provided by the embodiment of the present invention may be a mobile phone shown in fig. 22, and may also be any electronic product with a display function, including but not limited to the following categories: the touch screen display system comprises a television, a notebook computer, a desktop display, a tablet computer, a digital camera, an intelligent bracelet, intelligent glasses, a vehicle-mounted display, medical equipment, industrial control equipment, a touch interaction terminal and the like, and the embodiment of the invention is not particularly limited in this respect.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that the features of the various embodiments of the invention may be partially or fully coupled to each other or combined and may be capable of cooperating with each other in various ways and of being technically driven. Numerous variations, rearrangements, combinations, and substitutions will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

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

2. The backlight module as claimed in claim 1, wherein the second light emitting region comprises at least a corner region of the backlight module.

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

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

5. A backlight module according to any one 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 side of the first light-emitting elements is different from the extension direction of the long side of the second light-emitting elements.

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

the second light emitting unit includes at least two of the second light emitting elements.

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

8. The backlight module according to claim 7, wherein 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 the plane of the substrate;

the two second light-emitting units adjacently arranged along the first direction comprise a second light-emitting unit and a second diethyl light-emitting unit, the second light-emitting unit comprises a second light-emitting element and a second diethyl light-emitting element, the second diethyl light-emitting unit comprises a second dipropylene light-emitting element and a second dibutyl light-emitting element, the second xylene-emitting element and the second diethyl light-emitting element are sequentially arranged along the first direction, the second dipropylene light-emitting element and the second dibutyl light-emitting element are sequentially arranged along the first direction, the long-edge extending direction of the second xylene-emitting element is the same as the long-edge extending direction of the second dibutyl light-emitting element, and the long-edge extending direction of the second diethyl light-emitting element is the same as the long-edge extending direction of the second dipropylene light-emitting element.

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

10. A backlight module according to claim 1, wherein the reflective structure comprises a first reflective structure located between two adjacent light emitting units; the first reflection structure comprises a first sub reflection structure extending along a first direction and a second sub reflection structure extending along a second direction, and the first sub reflection structure and the second sub reflection structure are arranged in a crossed manner and define at least part of the edge of the light emitting unit arrangement area; the first sub-reflection structure and the second sub-reflection structure respectively comprise a first reflection wall close to one side of the light-emitting unit; the first direction and the second direction are intersected and are parallel to the plane of the substrate.

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

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

12. The backlight module according to claim 11, 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;

an included angle between a tangent line at the first reflection position and a plane where the substrate is located is beta, an included angle between a tangent line at the second reflection position and the plane where the substrate is located is gamma, wherein beta is more than 0 degree and gamma is less than or equal to 90 degrees.

13. The backlight module as claimed in claim 10, 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.

14. A backlight module according to claim 10, wherein the first reflective structure comprises a first reflective wall and a first second reflective wall, and the first reflective wall and the first second reflective wall respectively face the light emitting units on two sides of the first reflective structure;

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

15. A backlight module according to claim 10, wherein a side of the first sub-reflective structure and/or the second sub-reflective structure facing away from the substrate is provided with a groove, and a depth of the groove is smaller than a maximum thickness of the first reflective structure.

16. The backlight module according to claim 1, wherein the reflective structure comprises a second reflective structure 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 includes a second reflecting wall adjacent to one side of the light emitting unit.

17. A backlight module according to claim 16, wherein the second reflective wall comprises an inclined surface, and the inclined surface comprises a flat surface or a curved surface;

and the width of the second reflection structure is reduced along the light-emitting direction of the backlight module.

18. The backlight module according to claim 17, wherein the second reflective wall comprises a curved surface;

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

an included angle between a tangent line at the third reflection position and the plane of the substrate is delta, an included angle between a tangent line at the fourth reflection position and the plane of the substrate is epsilon, and the included angle is 0 degrees < delta < epsilon < 90 degrees.

19. A backlight module according to claim 16, wherein the second reflective structure comprises a plastic frame and a reflective sheet disposed on a side of the plastic frame adjacent to the light-emitting unit.

20. The backlight module according to claim 10, further comprising an optical film disposed on a side of the first reflective structure away from the substrate;

the surface of one side, close to the substrate, of the optical die is provided with a plurality of optical structures, each optical structure comprises a plurality of reflection dots, the plurality of reflection dots form a reflection area, and an area between every two adjacent reflection dots forms a light transmission area;

the light emitting unit and a first reflecting structure at least partially surrounding the light emitting unit form a first area;

along the light-emitting direction of the backlight module, the optical structure is at least partially overlapped with the first area.

21. A backlight module according to claim 20, wherein the optical structure comprises a first optical region, a second optical region and a third optical region;

the first area comprises a light-emitting unit arrangement area, an intermediate area between the optical unit and the first reflection structure, and a first reflection structure arrangement area;

along the light outgoing direction of the backlight module, the first optical area is at least partially overlapped with the light-emitting element arrangement area, the second optical area is at least partially overlapped with the middle area, and the third optical area is at least partially overlapped with the first reflection structure arrangement area;

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

22. The backlight module according to claim 21, wherein the distribution density of the reflective mesh in the first optical area is greater than the distribution density of the reflective mesh in the second optical area; and/or the coverage area of the reflective dots in the first optical zone is larger than the coverage area of the reflective dots in the second optical zone;

the distribution density of the reflective mesh points in the second optical zone is greater than the distribution density of the reflective mesh points in the third optical zone; and/or the coverage area of the reflective dots in the second optical zone is larger than the coverage area of the reflective dots in the third optical zone.

23. A backlight module according to claim 20, wherein the sum of the areas covered by the reflective dots per unit area decreases in a direction from the center of the optical structure to the edge of the optical structure.

24. A backlight module according to claim 20, wherein a surface of the optical film on a side away from the substrate is provided with a roughened structure.

25. A display device comprising the backlight module of any one of claims 1-24.