Backlight module and display device

Abstract

The backlight module comprises a light-emitting substrate and a composite optical film layer located on the light-emitting side of the light-emitting substrate, the light-emitting substrate comprises a plurality of light-emitting devices and a plurality of retaining wall structures, and the light-emitting devices are arranged in an array mode in the first direction and the second direction. The retaining wall structure is located in a third direction and / or a fourth direction of any light emitting device, the first direction and the second direction intersect with the third direction, the first direction and the second direction intersect with the fourth direction, and the third direction intersects with the fourth direction; the retaining wall structure comprises a plurality of reflecting pieces stacked in the thickness direction of the light-emitting substrate, each reflecting piece is provided with a protruding part, and the protruding direction of the protruding parts is perpendicular to the thickness direction.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a backlight module and a display device. Background Art

[0002] In recent years, Mini-LED has been developed and applied to terminal display fields such as TV, laptops, and monitors. However, to build a direct-lit backlight with uniform brightness, thousands to tens of thousands of Mini-LED units are required, which has raised concerns about the increase in backlight manufacturing costs. This problem can be solved by increasing the spacing between Mini-LEDs to control the backlight with a smaller number of Mini-LEDs; however, this method often reduces brightness uniformity and produces halo. Currently, the control of halo is to reduce the degree of halo by performing brightness compensation on the panel side, and there are few reports on improving halo in the design of Mini-LED backlight sources. Summary of the invention

[0003] Embodiments of the present disclosure provide a backlight module and a display device.

[0004] In a first aspect, an embodiment of the present disclosure provides a backlight module, comprising a light-emitting substrate and a composite optical film layer located on a light-emitting side of the light-emitting substrate, wherein the light-emitting substrate comprises: a plurality of light-emitting devices and a plurality of retaining wall structures, wherein the plurality of light-emitting devices are arranged in an array along a first direction and a second direction, and the retaining wall structures are located in a third direction and / or a fourth direction of any of the light-emitting devices, wherein the first direction and the second direction both intersect with the third direction, the first direction and the second direction both intersect with the fourth direction, and the third direction intersects with the fourth direction;

[0005] The retaining wall structure includes a plurality of reflective members stacked along the thickness direction of the light-emitting substrate, each of the reflective members has a protruding portion, and the protruding direction of the protruding portion is perpendicular to the thickness direction.

[0006] In some embodiments, the light emitting device includes two epitaxial structures connected in parallel, wherein a first end of the epitaxial structure is a P pole and a second end is an N pole.

[0007] The two epitaxial structures in the same light-emitting device are arranged in the same direction, and the arrangement direction is a direction from the first end of the epitaxial structure to the second end.

[0008] In some embodiments, the outer edge of the protrusion is arc-shaped or sawtooth-shaped.

[0009] In some embodiments, the outer surface of the retaining wall structure is coated with a reflective material.

[0010] In some embodiments, the ratio of the height of the retaining wall structure to the height of the light emitting device is 0.9 to 1.1.

[0011] In some embodiments, the surface of the retaining wall structure in contact with the light-emitting substrate is a first shape, and the orthographic projection of any of the reflective members on the light-emitting substrate is a second shape.

[0012] The first figure and the second figure are concentric circles, and the difference between the radius of the second figure and the radius of the first figure is 0.04 mm to 0.06 mm.

[0013] In some embodiments, the main material of the retaining wall structure includes PC or PMMA.

[0014] In some embodiments, the backlight module further includes an optical adjustment layer, and the optical adjustment layer is located between the light-emitting substrate and the composite optical film.

[0015] The optical adjustment layer includes a sealing layer and a plurality of micro-scattering structures located on a side of the sealing layer facing the light-emitting device, wherein the sealing layer covers the plurality of light-emitting devices, and the orthographic projection of the micro-scattering structure on the light-emitting substrate does not overlap with the area where the light-emitting device is located.

[0016] In some embodiments, the orthographic projection of the micro-scattering structure on the light-emitting substrate and the orthographic projection of the corresponding retaining wall structure on the light-emitting substrate at least partially overlap;

[0017] The surface of the micro-scattering structure facing the light-emitting substrate is in contact with the corresponding retaining wall structure.

[0018] In some embodiments, the micro-scattering structure is in a triangular prism shape, and includes a first surface in contact with the sealing layer, and a second surface in contact with the retaining wall structure, and the area of ​​the first surface is greater than the area of ​​the second surface.

[0019] In some embodiments, a portion of the retaining wall structure that contacts the micro-scattering structure is located within the region where the second surface is located.

[0020] In some embodiments, the sealing layer includes a main body and scattering particles uniformly arranged in the main body, the material of the main body includes a transparent colloid, and the material of the scattering particles is PMMA or silicon dioxide.

[0021] In some embodiments, the ratio of the height of the micro-scattering structure to the thickness of the sealing layer is 0.9-1.1.

[0022] In some embodiments, the composite optical film layer includes: a reflective film, a brightness enhancement film and a plurality of sub-films arranged in sequence in a direction away from the light-emitting substrate, wherein the plurality of sub-films include at least a quantum dot film, a diffusion film and at least one spectroscopic film.

[0023] In a second aspect, an embodiment of the present disclosure provides a display device, comprising the backlight module and the display panel described in the first aspect.

[0024] In the backlight module provided in the embodiments of the present disclosure, a retaining wall structure is arranged between the light-emitting devices, and the retaining wall structure is located in the third direction of the light-emitting devices. That is to say, the retaining wall structure can be arranged at the upper left, upper right, lower left and lower right of the light-emitting devices. The retaining wall structure located around the light-emitting devices can reflect the light emitted by the light-emitting devices back, thereby reducing the divergence of light between adjacent light-emitting devices and improving the problem of halo and lamp shadow generated in the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0026] Figure 1a-1 , Figure 1b-1 , Figure 1c-1 It is a schematic diagram of the structures of various sealing structures provided in the related art;

[0027] Figure 1a-2 For along Figure 1a-1 Schematic diagram of the section along the AA line;

[0028] Figure 1b-2 For along Figure 1b-1 Schematic diagram of the section along the middle BB line;

[0029] Figure 1c-2 For along Figure 1c-1 Schematic diagram of the cross section of the CC line;

[0030] Figure 2 A schematic diagram of the structure of a backlight module provided in an embodiment of the present disclosure;

[0031] Figure 3a and Figure 3b A schematic diagram of a cross-sectional structure of a retaining wall structure provided in an embodiment of the present disclosure;

[0032] Figure 4a A schematic top view of an optical adjustment layer and a light-emitting device provided in an embodiment of the present disclosure;

[0033] Figure 4b A schematic top view of an optical adjustment layer, a retaining wall structure and a light-emitting device provided in an embodiment of the present disclosure;

[0034] Figure 4c A schematic structural diagram of a micro-scattering structure provided in an embodiment of the present disclosure.

[0035] Description of reference numerals:

[0036] Light-emitting substrate 1, optical adjustment layer 2, composite optical film layer 3; sealing structure 1', packaging part 1"; light-emitting device L, retaining wall structure 10; peripheral area B, light-emitting area A, pixel area A1, spacer area A2; retaining wall structure 10, reflector 11, protrusion 110, second surface a2; optical adjustment layer 2, sealing layer 21, main body 210, scattering particles 211, micro-scattering structure 22, first surface a1; composite optical film layer 3, reflective film DBEF, brightness enhancement film BEF, sub-film 30, spectroscopic film 01, spectroscopic film 02, spectroscopic film 03, quantum dot film QD, blue light transmission film BLT, first direction X, second direction Y, third direction M1, fourth direction M2, central area c. DETAILED DESCRIPTION

[0037] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0039] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, "including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] In recent years, smaller Mini-LEDs have been developed and applied to terminal display fields such as TVs, laptops, and monitors. However, to build a direct-lit backlight source with uniform brightness, thousands to tens of thousands of Mini-LED units are required, which has raised concerns about the increase in backlight manufacturing costs. This problem can be solved by increasing the spacing between Mini-LEDs to control backlight modules with a smaller number of Mini-LEDs; however, this method often reduces brightness uniformity and produces halos. Currently, the control of halos is to perform brightness compensation on the panel side to reduce the degree of halos, and there are few reports on improving halos in the design of Mini-LED backlight modules.

[0041] Figure 1a-1 , Figure 1b-1 , Figure 1c-1 It is a schematic diagram of the stacked structure of various backlight modules provided in the related art. Figure 1a-2 For along Figure 1a-1 Schematic diagram of the section along the AA line. Figure 1b-2 For along Figure 1b-1 Schematic diagram of the section of the BB line. Figure 1c-2 For along Figure 1c-1 Schematic diagram of the cross-section along the CC line.

[0042] Specifically, Figure 1a-1 to Figure 1c-2 As shown, the backlight module includes a light-emitting substrate 1, a plurality of light-emitting devices L located on one side of the light-emitting substrate 1 (taking 3×3 light-emitting devices arranged in an array as an example), and an encapsulation layer 1', and the material of the encapsulation layer 1' includes transparent optical glue or transparent silicone. Figure 1c-1 As shown, the light-emitting substrate 1 includes a light-emitting area A and a peripheral area B surrounding the light-emitting area A, and the light-emitting area A includes a plurality of light-emitting areas A1 arranged in an array, and adjacent light-emitting areas A1 can be separated by a spacing area A2. It should be understood that the backlight module includes a light-emitting substrate and an optical film group located on the light-emitting side of the light-emitting substrate, and the distance between the light-emitting substrate and the optical film group forms a mixing distance. A suitable mixing distance can fully mix the light beams between adjacent light-emitting devices, thereby reducing the lamp shadows caused by the spacing between adjacent light-emitting devices. Generally, when the thickness requirements of the display device are low, the backlight module can provide a higher mixing distance, such as a monitoring display; similarly, when the thickness requirements of the display device are high, the backlight module cannot provide enough thickness space for mixing, such as a laptop computer.

[0043] In related technologies, such as Figure 1a-1 , Figure 1a-2 As shown, the encapsulation layer 1' is a whole surface structure, which is arranged on the side of the light emitting device L away from the light emitting substrate 1. This structure will reduce the light output brightness of the light emitting substrate; Figure 1b-1 , Figure 1b-2As shown, an annular retaining wall 10' is provided in the peripheral area B. The retaining wall is made of white silica gel and has a certain reflectivity. The encapsulation layer 1' is provided in the light-emitting area or in the area surrounded by the retaining wall 10'. This solution can improve the light leakage problem in the peripheral area. Figure 1c-1 , Figure 1c-2 As shown, a retaining wall 10' is provided in the spacing area A2 and the peripheral area B. The retaining wall is made of white silicone with a certain reflectivity. The encapsulation layer 1' is provided in the light-emitting area, or in the area surrounded by the retaining wall 10'. This solution can improve the halo and increase the brightness of the light-emitting substrate, but there will be a more obvious lamp shadow problem.

[0044] In order to solve at least one of the above technical problems, an embodiment of the present disclosure provides a backlight module capable of reducing halo effect and lamp shadow.

[0045] Figure 2 A schematic diagram of the structure of a backlight module provided in an embodiment of the present disclosure is shown in FIG. Figure 2 As shown, the backlight module includes a light-emitting substrate 1 and a composite optical film layer 3 located on the light-emitting side of the light-emitting substrate 1, wherein the light-emitting substrate 1 includes: a plurality of light-emitting devices L and a plurality of retaining wall structures 10, the plurality of light-emitting devices L are arranged in an array along a first direction X and a second direction Y, the retaining wall structure 10 is located in a third direction M1 or a fourth direction M2 of any light-emitting device L, the first direction X and the second direction Y both intersect with the third direction M1, the first direction X and the second direction Y both intersect with the fourth direction M2, and the third direction M1 intersects with the fourth direction M2.

[0046] The retaining wall structure 10 includes a plurality of reflective members 11 stacked along the thickness direction of the light-emitting substrate 1 . Each reflective member 11 has a protruding portion 110 . The protruding direction of the protruding portion 110 is perpendicular to the thickness direction.

[0047] In the backlight module provided in the embodiment of the present disclosure, a retaining wall structure 10 is arranged between the light-emitting devices L. The retaining wall structure 10 is located in the third direction M1 and / or the fourth direction M2 of the light-emitting device L. That is to say, the retaining wall structure 10 can be arranged at the upper left, upper right, lower left and lower right of the light-emitting device L. The retaining wall structure 10 located around the light-emitting device L can reflect the light emitted by the light-emitting device L back, thereby reducing the divergence of light between adjacent light-emitting devices L and improving the problem of halo and lamp shadow generated in the backlight module.

[0048] Furthermore, a light emitting device having two parallel epitaxial structures may be used. Compared with a light emitting device having a single epitaxial structure, the light emitting device has brighter brightness and more advantageous optical gain effect, and thus the light shadow and halo may be reduced to a certain extent.

[0049] In one example, the light-emitting substrate includes a plurality of array-arranged light zones, each light zone is provided with a light-emitting device L, and the light-emitting device L has two parallel epitaxial structures. The light-emitting device L having two parallel epitaxial structures can improve the light intensity of the light-emitting device and reduce the degree of lamp shadow to a certain extent; at the same time, the arrangement directions of the two epitaxial structures L0 in the same light-emitting device L are set to be parallel, which further improves the situation where the light-emitting device generates lamp shadow.

[0050] Figure 3a and Figure 3b The schematic diagram of the cross-sectional structure of the retaining wall structure 10 provided in the embodiment of the present disclosure is as follows. It should be understood that the retaining wall structure 10 includes a plurality of stacked reflectors 11, and the reflectors 11 can reflect the light emitted by the light emitting device L to enhance the light emitting effect. Therefore, the height of the retaining wall structure 10 is substantially the same as the height of the light emitting device L. The above height refers to the distance in the thickness direction of the light emitting substrate 1.

[0051] In some embodiments, the ratio of the height of the retaining wall structure 10 to the height of the light emitting device L is 0.9-1.1, so that the retaining wall structure 10 can reflect the light of the light emitting device L back to the light emitting unit where it is located, thereby reducing the halo.

[0052] In some embodiments, the main body material of the retaining wall structure 10 is polycarbonate PC or polymethyl methacrylate (PMMA), both of which have good stability and transparency and are easy to prepare, but compared with PC, PMMA has stronger scratch resistance.

[0053] In order to reflect light, the outer surface of the retaining wall structure 10 is coated with a reflective material. The reflective material may include one of white reflective material TiO2 and silver reflective material Ag, which is not limited in the embodiment of the present disclosure.

[0054] In some embodiments, Figure 3a The outer edge of the protrusion 110 is arc-shaped, forming an R-cut retaining wall structure; or Figure 3b The outer edge of the protrusion 110 is serrated to form a V-cut retaining wall structure.

[0055] In addition, since the plurality of light emitting devices L in the light emitting substrate 1 are arranged in an array along the first direction X and the second direction Y, and the retaining wall structure 10 and the light emitting devices L are arranged along the third direction M1 or the fourth direction M2. The first direction X and the second direction Y both intersect with the third direction M1, and the first direction X and the second direction Y both intersect with the fourth direction M2. Specifically, a central area c is defined between the 2×2 light emitting devices L in two adjacent rows and two connected columns arranged in an array, and the retaining wall structure 10 is located on the central area c.

[0056] like Figure 3a , Figure 3b As shown, the first distance L' between each retaining wall structure 10 and any light emitting device L located around it can be the distance between the two in the first direction X or in the second direction Y, and the distances between the retaining wall structure 10 and the light emitting device L in the first direction X and the second direction Y can be equal. The above-mentioned first distance L' is related to the pixel density of the light emitting substrate 1, and the specific value can be flexibly adjusted according to the experience of those skilled in the art, and the embodiments of the present disclosure do not limit this.

[0057] like Figure 3a , Figure 3b As shown, in the same retaining wall structure 10, the outer edges of the protrusions 110 on two adjacent reflectors 11 are at a second distance P in the thickness direction of the light-emitting substrate 1. In one example, the ratio between the first distance L' and the second distance P is 0.3 to 0.8. In other words, the height of the reflector 11, i.e., the second distance P, can be flexibly adjusted according to the pixel density so that the retaining wall structure 10 presents the best reflective effect and minimizes halo and lamp shadow.

[0058] In some embodiments, Figure 3a , Figure 3b As shown, the surface where the retaining wall structure 10 contacts the light-emitting substrate 1 is a first figure, and the orthographic projection of any reflector 11 on the light-emitting substrate 1 is a second figure. The first figure and the second figure are concentric circles, and the difference Q between the radius of the second figure and the radius of the first figure is 0.04 mm to 0.06 mm. By setting it in this way, a convex portion with a certain depth is formed on the retaining wall structure 10, which increases the reflection angle of the retaining wall structure 10 and helps to reduce halo and lamp shadow.

[0059] like Figure 2 As shown, the backlight module further includes an optical adjustment layer 2, which is located between the light-emitting substrate 1 and the composite optical film. The optical adjustment layer 2 includes an integrated sealing layer 21, and a plurality of micro-scattering structures 22 located on the side of the sealing layer 21 facing the light-emitting device L, wherein the sealing layer 21 covers the plurality of light-emitting devices L, and the orthographic projection of the micro-scattering structure 22 on the light-emitting substrate 1 does not overlap with the area where the light-emitting device L is located. The sealing layer 21 covers the light-emitting substrate 1, which can reduce the risk of corrosion of the circuit structure in the light-emitting substrate 1.

[0060] Figure 4a A schematic top view of the optical adjustment layer and the light-emitting device provided in an embodiment of the present disclosure, Figure 4b A schematic top view of the optical adjustment layer, the retaining wall structure and the light-emitting device provided in an embodiment of the present disclosure.

[0061] In some embodiments, the sealing layer 21 includes a main body 210 and scattering particles 211 uniformly arranged in the main body 210 . The material of the main body 210 includes transparent colloid, and the material of the scattering particles 211 is PMMA or silicon dioxide.

[0062] In one example, the material of the body portion 210 may be a resin material, or other inorganic materials, which can protect the light-emitting substrate 1 from being corroded by water and oxygen.

[0063] In one example, the diameter of the scattering particles 211 may be 50 nm to 100 nm, and the scattering performance of the sealing layer 21 may be increased by providing the scattering particles 211. Furthermore, the scattering particles 211 may be implemented by coating and printing.

[0064] Figure 4c A schematic diagram of a micro-scattering structure 22 provided in an embodiment of the present disclosure is shown in FIG. Figure 4c As shown, the micro-scattering structure 22 is in the shape of a triangular pyramid, and its upper and lower surfaces are both in the shape of regular triangles, and the surface with a larger area is connected to the sealing layer 21 as the upper surface. During the preparation process, the micro-scattering structure 22 can be connected to the sealing layer 21 by a hot pressing transfer method.

[0065] In addition, it should be noted that no scattering particles 211 are disposed on the portion of the sealing layer 21 where the micro-scattering structure 22 is disposed.

[0066] like Figure 4b As shown, each micro-scattering structure 22 has a corresponding retaining wall structure 10, and the surface of the micro-scattering structure 22 facing the light-emitting substrate 1 is in contact with the corresponding retaining wall structure 10. The micro-scattering structure 22 includes a first surface a1 in contact with the sealing layer 21, and a second surface a2 in contact with the retaining wall structure 10, and the area of ​​the first surface a1 is larger than the area of ​​the second surface a2. In one example, the second surface a2 can be a plane or a smooth convex surface.

[0067] In some embodiments, Figure 4b As shown, the portion of the retaining wall structure 10 that contacts the micro-scattering structure 22 is located in the area where the second surface a2 is located. From the above analysis, it can be seen that the upper surface of the retaining wall structure 10 contacts the micro-scattering structure 22, the contact portion is circular, and the second surface a2 of the micro-scattering structure 22 that contacts the retaining wall structure 10 is triangular, and the circle falls within the area of ​​the triangle.

[0068] In some embodiments, Figure 2 As shown, the ratio of the height h1 of the micro-scattering structure 22 to the thickness h2 of the sealing layer 21 is 1 / 20 to 1 / 16. In one example, the thickness of the sealing layer 21 is 0.2 mm to 0.3 mm.

[0069] like Figure 2 As shown, the backlight module also includes a composite optical film layer 3 located on the side of the optical adjustment layer 2 away from the light-emitting substrate 1. The composite optical film layer 3 includes: a reflective film DBEF, a brightness enhancement film BEF and a plurality of sub-films 30 arranged in sequence in a direction away from the light-emitting substrate 1, and the plurality of sub-films 30 include at least a quantum dot film QD, a blue light transmission film BLT and at least one spectroscopic film. For example, the plurality of sub-films 30 include at least a quantum dot film QD, a blue light transmission film BLT, a spectroscopic film 01, a spectroscopic film 02 and a spectroscopic film 03.

[0070] It should be understood that the liquid crystal display device includes a backlight module and a liquid crystal display panel, wherein the backlight module provides a light source, and an upper polarizer and a lower polarizer are respectively arranged on both sides of the liquid crystal display panel. The lower polarizer is used to convert the light beam provided by the backlight module into polarized light, and the upper polarizer is used to analyze the polarized light after being electrically modulated by the liquid crystal to produce a light and dark contrast, thereby producing a display picture.

[0071] Furthermore, the reflective film DBEF in the composite optical module is a reflective polarizer, which selectively reflects the light of the backlight module so that it is not absorbed by the lower polarizer, thereby making all polarization angles of light available. This arrangement can increase the axial brightness of the light-emitting substrate 1 by about 60%.

[0072] In some embodiments, the plurality of sub-films include a quantum dot film QD, a blue light transmission film BLT, and three beam splitting films. The positional relationship of the above five film layers is not limited in the embodiments of the present disclosure.

[0073] In one example, the splitter film 301 , which is the farthest from the light-emitting substrate 1 among the three splitter films, has a splitter angle that is consistent with the arrangement angle of two epitaxial structures in a light-emitting unit. This arrangement can increase light brightness and reduce lamp shadows.

[0074] Combined with the above analysis, in the embodiments of the present disclosure, by setting a retaining wall structure between the light-emitting devices and setting a micro-scattering structure on the sealing layer, the light shadow and halo generated in the backlight module are reduced. The performance of the backlight module provided by the embodiments of the present disclosure is evaluated through experimental data results in combination with the comparative example. It should be noted that the light-emitting device with two parallel epitaxial structures is used on the light-emitting substrate in the backlight module provided in the embodiments 1-6 of the present disclosure and comparative example 1; the light-emitting device on the light-emitting substrate in the backlight module of comparative examples 2-4 adopts a single epitaxial structure, that is, there is only one epitaxial structure in one light-emitting device.

[0075] Embodiment 1: A backlight module is provided. The light-emitting device on the light-emitting substrate of the backlight module adopts a light-emitting device with two parallel epitaxial structures. A V-Cut retaining wall structure is used between adjacent light-emitting devices. The material of the main body of the retaining wall structure is PC, and the reflective material coated on the surface of the retaining wall structure is a silver reflective material. The height of the micro-scattering structure on the optical adjustment layer is 1 / 20 of the thickness of the sealing layer. The composite optical film layer 3 includes a beam splitting film 01, a beam splitting film 02, a beam splitting film 03, a quantum dot film QD, a blue light transmission film BLT, a diffusion film, a brightness enhancement film BEF, and a reflective film DBEF, which are stacked in sequence in a direction away from the light-emitting substrate.

[0076] Embodiment 2: A backlight module is provided. The light-emitting device on the light-emitting substrate of the backlight module adopts a light-emitting device with two parallel epitaxial structures. An R-Cut retaining wall structure is used between adjacent light-emitting devices. The material of the main body of the retaining wall structure is PC, and the reflective material coated on the surface of the retaining wall structure is a silver reflective material. The height of the micro-scattering structure on the optical adjustment layer is 1 / 20 of the thickness of the sealing layer. The composite optical film layer 3 includes a beam splitting film 01, a quantum dot film QD, a blue light transmission film BLT, a beam splitting film 02, a beam splitting film 03, a diffusion film, a brightness enhancement film BEF, and a reflective film DBEF, which are stacked in sequence in a direction away from the light-emitting substrate.

[0077] Embodiment 3: A backlight module is provided. The light-emitting device on the light-emitting substrate of the backlight module adopts a light-emitting device with two parallel epitaxial structures. An R-Cut retaining wall structure is used between adjacent light-emitting devices. The material of the main body of the retaining wall structure is PC, and the reflective material coated on the surface of the retaining wall structure is a silver reflective material. The height of the micro-scattering structure on the optical adjustment layer is 1 / 20 of the thickness of the sealing layer. The composite optical film layer 3 includes a diffusion film, a spectroscopic film 01, a quantum dot film QD, a blue light transmission film BLT, a spectroscopic film 02, a spectroscopic film 03, a brightness enhancement film BEF, and a reflective film DBEF, which are stacked in sequence in the direction away from the light-emitting substrate.

[0078] Embodiment 4: A backlight module is provided, wherein the light-emitting device on the light-emitting substrate of the backlight module adopts a light-emitting device having two parallel epitaxial structures, and a V-Cut retaining wall structure is adopted between adjacent light-emitting devices. The material of the main body of the retaining wall structure is PMMA, and the reflective material coated on the surface of the retaining wall structure is a silver reflective material. The height of the micro-scattering structure on the optical adjustment layer is 1 / 16 of the thickness of the sealing layer. The composite optical film layer 3 includes a diffusion film, a spectroscopic film 01, a quantum dot film QD, a blue light transmission film BLT, a spectroscopic film 02, a spectroscopic film 03, a brightness enhancement film BEF, and a reflective film DBEF, which are stacked in sequence in a direction away from the light-emitting substrate.

[0079] Embodiment 5: A backlight module is provided, wherein the light-emitting device on the light-emitting substrate of the backlight module adopts a light-emitting device having two parallel epitaxial structures, and an R-Cut retaining wall structure is adopted between adjacent light-emitting devices. The material of the main body of the retaining wall structure is PC, and the reflective material coated on the surface of the retaining wall structure is a silver reflective material. The height of the micro-scattering structure on the optical adjustment layer is 1 / 18 of the thickness of the sealing layer. The composite optical film layer 3 includes a beam splitting film 01, a diffusion film, a quantum dot film QD, a blue light transmission film BLT, a beam splitting film 02, a beam splitting film 03, a brightness enhancement film BEF, and a reflective film DBEF, which are stacked in sequence in a direction away from the light-emitting substrate.

[0080] Embodiment 6: A backlight module is provided, wherein the light-emitting device on the light-emitting substrate of the backlight module adopts a light-emitting device having two parallel epitaxial structures, an R-Cut retaining wall structure is adopted between adjacent light-emitting devices, the material of the main body of the retaining wall structure is PC, and the reflective material coated on the surface of the retaining wall structure is a silver reflective material. The height of the micro-scattering structure on the optical adjustment layer is 1 / 18 of the thickness of the sealing layer. The composite optical film layer 3 includes a beam splitting film 01, a diffusion film, a quantum dot film QD, a blue light transmission film BLT, a beam splitting film 02, a beam splitting film 03, a brightness enhancement film BEF, and a reflective film DBEF, which are stacked in sequence in a direction away from the light-emitting substrate.

[0081] Comparative Example 1: A backlight module is provided, wherein a light-emitting device having two parallel epitaxial structures is used on the light-emitting substrate of the backlight module, and the protective layer covering the light-emitting substrate is a flat glue as shown in FIG. 1a. The composite optical film layer includes a beam splitter film 01, a diffusion film, a quantum dot film QD, a blue light transmission film BLT, a beam splitter film 02, a beam splitter film 03, a brightness enhancement film BEF, and a reflection film DBEF, which are stacked in sequence in a direction away from the light-emitting substrate.

[0082] Comparative Example 2: A backlight module is provided, in which the light-emitting device on the light-emitting substrate adopts a single epitaxial structure, and the protective layer covering the light-emitting substrate is a flat glue as shown in FIG. 1a. An R-Cut retaining wall structure is adopted between the light areas, the material of the main body of the retaining wall structure is PC, and the reflective material coated on the surface of the retaining wall structure is a silver reflective material. The height of the micro-scattering structure on the flat glue is 1 / 18 of the thickness of the colloid. The composite optical film layer 3 includes a beam splitting film 01, a diffusion film, a quantum dot film QD, a blue light transmission film BLT, a beam splitting film 02, a beam splitting film 03, a brightness enhancement film BEF, and a reflective film DBEF, which are stacked in sequence in a direction away from the light-emitting substrate.

[0083] Comparative Example 3: A backlight module is provided, wherein the light emitting device on the light emitting substrate of the backlight module adopts a single epitaxial structure, and the protective layer covering the light emitting substrate is the dam glue shown in FIG1b. The composite optical film layer includes a beam splitting film 01, a diffusion film, a quantum dot film QD, a blue light transmission film BLT, a beam splitting film 02, a beam splitting film 03, a brightness enhancement film BEF, and a reflection film DBEF, which are sequentially stacked in a direction away from the light emitting substrate.

[0084] Comparative Example 4: A backlight module is provided, wherein the light emitting device on the light emitting substrate of the backlight module adopts a single epitaxial structure, and the protective layer covering the light emitting substrate is the dam glue shown in Figure 1b. The composite optical film layer includes a beam splitter film 01, a diffusion film, a quantum dot film QD, a blue light transmission film BLT, a beam splitter film 02, a beam splitter film 03, a beam splitter film 04, a brightness enhancement film BEF, and a reflection film DBEF, which are stacked in sequence in a direction away from the light emitting substrate.

[0085] The data in Table 1 are obtained by performing brightness and light shadow tests on the backlight modules provided in the above-mentioned embodiments 1-6 and comparative examples 1-4, respectively. The light shadow produced by the backlight module can be quantified by Formula 1.

[0086] Dot Mura = (max-min) / (max+min) / (Pitch^0.33+0.72)*100% Formula 1

[0087] Among them, max / min refers to the maximum brightness and minimum brightness of the light source provided by the backlight module; Pitch refers to the distance between adjacent light-emitting devices, for example, the distance between adjacent light-emitting devices in the first direction, i.e., the row direction, is 4.70 mm, and the distance between adjacent light-emitting devices in the second direction, i.e., the column direction, is 4.72 mm; and the uniformity of the light-emitting device η=min / max*100%.

[0088] It is not difficult to see from Table 1 that Example 6 has the best effect, with the highest brightness, a center brightness of 25900nit; excellent uniformity, with a brightness uniformity of 86%; and the lowest light shadow integration, with a light shadow integration of only 2%.

[0089] In addition, it can be seen from the table that the light-emitting device with two parallel epitaxial structures is used in the backlight module in Comparative Example 1, and the light-emitting device in the backlight module in Comparative Examples 2-4 adopts a single epitaxial structure. Therefore, the central brightness of Comparative Example 1 is significantly higher than that of the other three comparative examples; and no retaining wall structure is provided in Comparative Example 3, so the lamp shadow is most obvious, and the lamp shadow integration degree reaches 3.2%; further, on the basis of Comparative Example 3, a dichroic film 04 is added to form Comparative Example 4. Although Comparative Example 4 can achieve the same brightness and lamp shadow effects as Comparative Example 2, its thickness is also significantly increased due to the addition of film material.

[0090] Table 1

[0091] Based on the same inventive concept, an embodiment of the present disclosure further provides a display panel, comprising the above-mentioned backlight module.

[0092] The present disclosure also provides a display device, including the above display panel. The above display device can be: electronic paper, mobile phone, tablet computer, television, monitor, notebook computer, digital photo frame, navigator, or any other product or component with display function, which is not limited in the present disclosure.

[0093] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A backlight module, characterized in that: A composite optical film layer is provided, comprising a light-emitting substrate and a light-emitting side of the light-emitting substrate, wherein the light-emitting substrate comprises: a plurality of light-emitting devices and a plurality of retaining wall structures, wherein the plurality of light-emitting devices are arranged in an array along a first direction and a second direction, and the retaining wall structures are located in a third direction and / or a fourth direction of any of the light-emitting devices, wherein the first direction and the second direction both intersect with the third direction, the first direction and the second direction both intersect with the fourth direction, and the third direction intersects with the fourth direction; The retaining wall structure includes a plurality of reflective members stacked along the thickness direction of the light-emitting substrate, each of the reflective members has a protruding portion, and the protruding direction of the protruding portion is perpendicular to the thickness direction.

2. The backlight module according to claim 1, characterized in that: The light emitting device comprises two epitaxial structures connected in parallel, wherein the first end of the epitaxial structure is a P pole and the second end is an N pole. The two epitaxial structures in the same light-emitting device are arranged in the same direction, and the arrangement direction is a direction from the first end of the epitaxial structure to the second end.

3. The backlight module according to claim 1, characterized in that: The outer edge of the protrusion is arc-shaped or sawtooth-shaped.

4. The backlight module according to claim 1, characterized in that: The outer surface of the retaining wall structure is coated with a reflective material.

5. The backlight module according to claim 1, characterized in that: The ratio of the height of the retaining wall structure to the height of the light emitting device is 0.9 to 1.

1.

6. The backlight module according to claim 1, characterized in that: The surface of the retaining wall structure in contact with the light-emitting substrate is a first figure, and the orthographic projection of any of the reflective members on the light-emitting substrate is a second figure. The first figure and the second figure are concentric circles, and the difference between the radius of the second figure and the radius of the first figure is 0.04 mm to 0.06 mm.

7. The backlight module according to claim 1, characterized in that: The main body material of the retaining wall structure includes PC or PMMA.

8. The backlight module according to any one of claims 1 to 7, characterized in that: The backlight module further includes an optical adjustment layer, and the optical adjustment layer is located between the light-emitting substrate and the composite optical film. The optical adjustment layer includes a sealing layer and a plurality of micro-scattering structures located on a side of the sealing layer facing the light-emitting device, wherein the sealing layer covers the plurality of light-emitting devices, and the orthographic projection of the micro-scattering structure on the light-emitting substrate does not overlap with the area where the light-emitting device is located.

9. The backlight module according to any one of claims 1 to 7, characterized in that: The orthographic projection of the micro-scattering structure on the light-emitting substrate and the orthographic projection of the corresponding retaining wall structure on the light-emitting substrate at least partially overlap; The surface of the micro-scattering structure facing the light-emitting substrate is in contact with the corresponding retaining wall structure.

10. The backlight module according to claim 9, characterized in that: The micro-scattering structure is in a triangular prism shape and includes a first surface in contact with the sealing layer and a second surface in contact with the retaining wall structure. The area of ​​the first surface is greater than the area of ​​the second surface.

11. The backlight module according to claim 9, characterized in that: The portion of the retaining wall structure in contact with the micro-scattering structure is located in the area where the second surface is located.

12. The backlight module according to any one of claims 1 to 7, characterized in that: The sealing glue layer comprises a main body and scattering particles uniformly arranged in the main body. The material of the main body comprises transparent colloid, and the material of the scattering particles is PMMA or silicon dioxide.

13. The backlight module according to any one of claims 1 to 7, characterized in that: The ratio of the height of the micro-scattering structure to the thickness of the sealing layer is 1 / 20 to 1 / 16.

14. The backlight module according to any one of claims 1 to 7, characterized in that: The composite optical film layer comprises: a reflective film, a brightness enhancement film and a plurality of sub-films arranged in sequence in a direction away from the light-emitting substrate, wherein the plurality of sub-films at least comprise a quantum dot film, a diffusion film and at least one beam splitting film.

15. A display device, characterized in that: It comprises the backlight module and display panel as described in any one of claims 1 to 14.

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