Light-emitting substrate, backlight module and display device

Abstract

The embodiment of the invention provides a light-emitting substrate, a backlight module and a display device, relates to the technical field of display, and aims to improve the light-emitting quality of the light-emitting substrate. The light-emitting substrate comprises a bottom plate, a plurality of light-emitting units and a plurality of light mixing shells. The plurality of light-emitting units are arranged on one side of the bottom plate; in the multiple light mixing shells, one light mixing shell covers the light emitting side of at least one light emitting unit; the light mixing shell is provided with a containing groove, and at least one light-emitting unit is arranged in the containing groove. The display device is used for displaying images.

Description

Technical Field

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

[0002] With the development of display technology, liquid crystal display devices are applied to various electronic products. Since the liquid crystal of the liquid crystal display device does not have the characteristic of emitting light, a backlight module needs to be provided for the liquid crystal display device in order to make the liquid crystal display device display brightness. However, the backlight module has the problem of poor luminous quality. Summary of the invention

[0003] The purpose of the embodiments of the present disclosure is to provide a light-emitting substrate, a backlight module and a display device, so as to improve the light-emitting quality of the light-emitting substrate.

[0004] To achieve the above objectives, the embodiments of the present disclosure provide the following technical solutions:

[0005] In one aspect, a light-emitting substrate is provided, which includes a bottom plate, a plurality of light-emitting units and a plurality of light-mixing shells. The plurality of light-emitting units are arranged on one side of the bottom plate; among the plurality of light-mixing shells, a light-mixing shell cover is arranged on the light-emitting side of at least one light-emitting unit; the light-mixing shell has a receiving groove, and at least one light-emitting unit is arranged in the receiving groove.

[0006] In the above-mentioned light-emitting substrate, since one of the multiple light-mixing shells is disposed on the light-emitting side of at least one light-emitting unit, and the light-mixing shell has a receiving groove, and at least one light-emitting unit is disposed in the receiving groove, the light-mixing shell helps the light to be reflected and refracted multiple times inside the light-mixing shell, so that the light distribution of the light-emitting unit is more uniform, avoiding the phenomenon of local overbrightness or overdarkness, and improving the consistency of the brightness of the picture. Therefore, the light-emitting substrate provided in this embodiment has high light-emitting quality.

[0007] In some embodiments, the light-mixing shell includes a first surface, the first surface is a surface of the light-mixing shell away from the light-emitting unit, and the first surface is a curved surface convex in a direction away from the light-emitting unit.

[0008] In some embodiments, the mixing light shell includes a top shell and a side shell, the top shell includes the first surface, and the top shell also includes a second surface opposite to the first surface; one end of the side shell is connected to the top shell and surrounds the central axis of the top shell, and the second surface of the side shell and the top shell form the accommodating groove; the other end of the side shell is connected to the bottom plate.

[0009] In some embodiments, the side shell includes a first end face for connecting to the base plate; along the circumference of the accommodating groove, the first end face of the side shell is provided with a plurality of spaced protrusion structures, and the side walls opposite to adjacent protrusion structures form a heat dissipation channel with the first end face; the first end face of the side shell is connected to the base plate through the protrusion structure.

[0010] In some embodiments, the top shell includes a first part and at least one second part, the second part surrounds the first part, and the first part is connected to one second part; the haze of the first part is greater than the haze of the second part; when the top shell includes multiple second parts, the multiple second parts are arranged and connected in sequence along a first direction, and the first direction is radial to the first part and away from the first part; along the first direction, the haze of the multiple second parts gradually decreases.

[0011] In some embodiments, a light diffuser is distributed in at least the top shell of the mixed light shell; the light diffuser forms a plurality of island structures in the mixed light shell, and the plurality of island structures are evenly distributed; and / or the particle size of the light diffuser located in the first part of the top shell is smaller than the particle size of the light diffuser located in the second part of the top shell.

[0012] In some embodiments, one light-mixing shell covers a plurality of the light-emitting units, and the plurality of the light-emitting units are arranged in a matrix; the plurality of light-emitting units are centrally symmetrical about a first reference point, and a projection of the center of the first part of the top shell on the bottom plate coincides with the first reference point.

[0013] In some embodiments, the distance between adjacent light-emitting units in the receiving groove is P, the distance from the bottom surface of the receiving groove to the light-emitting unit is H, P=k×H, and the value range of k is 4.28-7.47.

[0014] In some embodiments, the diameter of the first portion is m, where m=Pb×H, and b ranges from 4.288 to 22.86.

[0015] In some embodiments, at least one quantum dot is distributed on the surface or inside of the mixing shell, each of the quantum dots is used to emit light of a preset color under the excitation of the light emitted by the light-emitting unit, and the light emitted by the at least one quantum dot and the light emitted by the light-emitting unit can synthesize white light.

[0016] In some embodiments, the mixing light shell includes a first surface, which is the surface of the mixing light shell away from the light-emitting unit, and the first surface is provided with a film layer including the quantum dots; or; at least the bottom surface of the receiving groove is provided with a film layer including the quantum dots.

[0017] In some embodiments, the light emitting unit is a blue light emitting unit, and the quantum dots include red quantum dots and green quantum dots.

[0018] In another aspect, a backlight module is provided, comprising a light-emitting substrate as described in any of the above embodiments, and a diffusion plate disposed on the light-emitting side of the light-emitting substrate.

[0019] In some embodiments, the light-emitting substrate also includes: a reflective sheet stacked on the bottom plate, the multiple light-emitting units and the multiple light-mixing shells are all fixed on the side of the reflective sheet away from the bottom plate; the distance between the diffuser plate and the reflective sheet is inversely proportional to the haze of the light-mixing shell.

[0020] In another aspect, a display device is provided, comprising: a backlight module as described in any of the above embodiments, a display panel ring and a middle frame. The display panel is arranged on the light-emitting side of the backlight module, the middle frame is provided with a receiving portion, and the display panel is arranged in the receiving portion.

[0021] The beneficial effects that can be achieved by the above-mentioned backlight module and display device are the same as the beneficial effects that can be achieved by the above-mentioned light-emitting substrate, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required to be used in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual size of the product involved in the embodiments of the present disclosure, the actual process of the method, the actual timing of the signal, etc.

[0023] Figure 1 is a structural diagram of a display device provided according to some embodiments;

[0024] Figure 2 A schematic diagram of light field distribution of a light emitting unit according to some embodiments;

[0025] Figure 3 A schematic diagram of light field distribution of a light emitting unit with a lens according to some embodiments;

[0026] Figure 4 for Figure 3 Light pattern diagram of the light-emitting unit in;

[0027] Figure 5 for Figure 1 Schematic diagram of the light emission of the display device when the light mixing distance is 32mm;

[0028] Figure 6 for Figure 1 Schematic diagram of the light emission of the display device when the light mixing distance is 10 mm;

[0029] Figure 7 A structural diagram of a backlight module provided according to some other embodiments;

[0030] Figure 8 A structural diagram of a backlight module provided according to some other embodiments;

[0031] Fig. 9 is a structural diagram of a light-emitting substrate provided according to some other embodiments;

[0032] Fig.10 is a structural diagram of a light-emitting substrate provided according to some other embodiments;

[0033] Fig.11 is a structural diagram of a light-emitting substrate provided according to some other embodiments;

[0034] Fig.12 A bottom view of a light mixing housing provided according to some embodiments;

[0035] Fig.13 A bottom view of a light-mixing housing provided according to some other embodiments;

[0036] Fig.14 A structural diagram of an upright light-mixing housing provided according to some embodiments;

[0037] Fig.15 A structural diagram of a light-mixing housing provided in an upright position according to some other embodiments;

[0038] Fig.16 A structural diagram of an inverted light-mixing housing according to some embodiments;

[0039] Fig.17 is a schematic diagram of a curvature radius of a light-mixing housing provided according to some embodiments;

[0040] Fig.18 A schematic diagram of the arrangement of a light-mixing housing and a light-emitting unit according to some embodiments;

[0041] Fig.19 A schematic diagram showing how the luminous intensity of a near light field of a luminous unit varies with the luminous angle according to some embodiments;

[0042] Fig. 20 is a schematic diagram of the distance between adjacent light-emitting units provided according to some embodiments;

[0043] Fig.21 A schematic diagram of the maximum distance and the minimum distance between adjacent light-emitting units according to some embodiments;

[0044] Fig. 22 A schematic diagram of a light-mixing housing provided with a plurality of light-emitting units according to some embodiments;

[0045] Fig.23 It is a schematic diagram of a light-mixing housing provided with a plurality of light-emitting units according to some other embodiments;

[0046] Fig.24 It is a schematic diagram of a light-mixing housing provided with a plurality of light-emitting units according to some other embodiments;

[0047] Fig.25 A structural diagram of a backlight module provided according to some other embodiments;

[0048] Fig.26 An optical simulation diagram of a backlight module including a light-mixing shell provided according to some embodiments;

[0049] Fig. 27 An optical simulation diagram of a backlight module not including a light mixing shell according to some embodiments;

[0050] Fig.28 is a structural diagram of a display device provided according to some embodiments. DETAILED DESCRIPTION

[0051] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.

[0052] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics described may be included in any one or more embodiments or examples in any appropriate manner.

[0053] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0054] “At least one of A, B, and C” has the same meaning as “at least one of A, B, or C” and both include the following combinations of A, B, and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B, and C.

[0055] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0056] The use of "adapted to" or "configured to" herein is meant to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0057] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0058] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of variation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0059] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within the acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism may be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity may also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality may be, for example, the difference between the two equalities is less than or equal to 5% of either one.

[0060] It will be understood that when a layer or an element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present between the layer or element and the other layer or substrate.

[0061] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of the layers and the area of ​​the regions are exaggerated for clarity. Therefore, variations in the shapes relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shapes of the regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0062] At present, direct backlight is one of the commonly used backlight technologies in LCD panels. Figure 1 The embodiment of the present disclosure provides a display device 1000, including: a bottom plate 10, a plurality of light-emitting units 20, a first diffusion plate 41, a prism sheet 42, a second diffusion plate 43 and a display panel OC. The plurality of light-emitting units 20 are arranged on one side of the bottom plate 10, wherein each light-emitting unit 20 is encapsulated by a lens 30. The first diffusion plate 41 mainly concentrates the light emitted from the plurality of light-emitting units 20 and projects it uniformly onto the prism sheet 42, while the second diffusion plate 43 mainly atomizes the light emitted from the prism sheet 42 and transmits the light uniformly to the display panel OC. At the same time, the second diffusion plate 43 can also protect the prism sheet 42.

[0063] refer to Figure 2 The light-emitting unit 20 includes a light-emitting diode (LED). The light-emitting unit 20, that is, the LED, emits light in a spherical shape. Figure 3 The lens 30 is packaged on the light emitting unit 20 to change the light field distribution of the light emitting unit 20. Figure 4 , the light intensity of the light-emitting unit 20 reaches the maximum when the light-emitting angle is about 70°. The light-emitting angle refers to the angle between the light emitted by the light-emitting unit 20 and the normal line, and the normal line is perpendicular to the plane where the bottom plate 10 is located. Since the light-emitting unit 20 mixes light between the first diffuser 41 and the bottom plate 10, a certain mixing distance D is required. The mixing distance D is usually about 30mm, so that an optical effect of 90% uniformity at nine points can be achieved (refer to Figure 5), nine-point uniformity refers to selecting nine points on a certain area or surface, and requiring these points to be consistent or nearly consistent in a certain measurement or performance. If the mixed light distance D is reduced, for example, the mixed light distance D is 10mm, there will be obvious light shadow phenomenon (reference Figure 6 ), which results in that the thickness of the display device 1000 cannot be further reduced.

[0064] In order to solve the above technical problems, the embodiment of the present disclosure provides a backlight module 100, referring to Figure 7 The backlight module 100 includes: a bottom plate 10, a reflective sheet 40, a plurality of light emitting units 20, a diffuser 50 and a quantum dot film 60. The reflective sheet 40 is arranged on one side of the bottom plate 10, the plurality of light emitting units 20 are arranged on a side of the reflective sheet 40 away from the bottom plate 10, the diffuser 50 is arranged on the light emitting side of the plurality of light emitting units 20, and the quantum dot film 60 is arranged on a side of the diffuser 50 away from the bottom plate 10.

[0065] The plurality of light-emitting units 20 are light-emitting units capable of emitting blue light. For example, the light-emitting units 20 may be mini light-emitting diodes (Mini Light-Emitting Diode, Mini LED for short) or micro light-emitting diodes (Micro Light-Emitting Diode, Micro LED for short).

[0066] The function of the reflective sheet 40 is to reflect the light emitted from the light emitting unit 20 but not directly directed to the diffuser 50, so as to ensure the utilization rate of the light and the uniformity of the light output brightness of the backlight module 100. The quantum dot film 60 includes red quantum dots and green quantum dots. The red quantum dots can convert the blue light emitted by the light emitting unit 20 into red light, and the green quantum dots can convert the blue light emitted by the light emitting unit 20 into green light. In this way, the light emitting unit 20 emitting blue light and the quantum dot film 60 can be used in combination to achieve a wide color gamut.

[0067] However, when the backlight module 100 is applied to a display device, on the one hand, Figure 7 Since the plurality of light-emitting units 20 are light-emitting units 20 capable of emitting blue light, after lighting up the light-emitting units 20 in a single area, the blue light emitted by the light-emitting units 20 in the single area passes through the diffusion plate 50 and then irradiates the quantum dot film 60, and the quantum dot film 60 excites red and green light. The light-emitting unit 20 is an isotropically scattered light source, so the downwardly scattered red and green light will expand toward the edge of the single area after repeated mixing between the diffusion plate 50 and the reflective sheet 40, and eventually form a non-uniform color light spot with a white center and a yellowish edge, and the area of ​​the light spot is larger than the area of ​​the light-emitting unit in the single area.

[0068] On the other hand, reference Figure 8The brightness distribution of the light-emitting surface of the backlight module 100 can be theoretically decomposed into the superposition of the light spots of many single regions. Since the light-emitting surface corresponding to a single region is displayed as a non-uniform light spot with a white center and yellowish edges, after the light spots are superimposed, the yellow light reaching the edge area is less than that reaching the center area, so the edge of the picture is visually blue. Figure 8 As shown, there is a blue area of ​​about 50mm around the white image.

[0069] Therefore, the light emitting quality of the backlight module 100 provided by the above embodiment is poor.

[0070] In order to solve the above technical problems, the embodiment of the present disclosure provides a light-emitting substrate 200, referring to Fig. 9 , Fig.10 or Fig.11 The light-emitting substrate 200 includes: a bottom plate 10, a plurality of light-emitting units 20 and a plurality of light-mixing shells 3. The plurality of light-emitting units 20 are arranged on one side of the bottom plate 10; among the plurality of light-mixing shells 3, one light-mixing shell 3 is arranged on the light-emitting side of at least one light-emitting unit 20; one side of the light-mixing shell 3 has a receiving groove C, and at least one light-emitting unit 20 is arranged in the receiving groove C.

[0071] Exemplary, reference Fig. 9 , Fig.10 or Fig.11 Among the multiple light-mixing shells 3 , one light-mixing shell 3 is disposed on the light-emitting side of four light-emitting units 20 ; and the four light-emitting units 20 are disposed in the receiving groove C of one light-mixing shell 3 .

[0072] In other embodiments, the number of light-emitting units 20 covered by a light-mixing shell 3 may also be 1, 2 or 4. The number of light-emitting units 20 covered by the light-mixing shell 3 may be set according to actual conditions, and the specific number is not limited.

[0073] In the light-emitting substrate 200 provided in the present embodiment, since one of the multiple light-mixing shells 3 is disposed on the light-emitting side of at least one light-emitting unit 20, and the light-mixing shell 3 has a receiving groove C, and at least one light-emitting unit 20 is disposed in the receiving groove C, the light-mixing shell 3 helps the light to be reflected and refracted multiple times inside the light-mixing shell 3, so that the light distribution of the light-emitting unit 20 is more uniform, avoiding the phenomenon of partial overbrightness or overdarkness, and improving the consistency of the brightness of the picture. Therefore, the light-emitting substrate 200 provided in the present embodiment has high light-emitting quality.

[0074] In some embodiments, the plurality of light emitting units 20 are blue light emitting units. Since the blue light emitted by the light emitting unit 20 has a shorter optical path and more transmission, the optical path of the light refracted and scattered multiple times in the light mixing shell 3 is increased, thereby avoiding the situation where the overall picture is blue due to the short optical path of the blue light.

[0075] The bottom plate 10 may be a metal back plate. The material of the bottom plate 10 may be aluminum, electrogalvanized steel plate (SECC), hot dip galvanized steel plate (SGCC), etc. In other embodiments, the material of the bottom plate 10 may also be other materials that can play a bearing role.

[0076] In some embodiments, reference Fig. 9 The light-mixing shell 3 includes a first surface M1, which is a surface of the light-mixing shell 3 away from the light-emitting unit 20, and is a curved surface convex in a direction away from the light-emitting unit 20. The first surface M1 is set as a curved surface convex in a direction away from the light-emitting unit 20, which is conducive to the convergence of light between adjacent light-mixing shells 3, improves the brightness between adjacent light-mixing shells 3, and can also diffuse the light emitted by the light-emitting unit 20 to a wider range, avoids the light from being concentrated in a certain area, and allows the light to cover the entire light-mixing area more evenly, reducing the phenomenon of local over-brightness or over-darkness.

[0077] The first surface M1 is a curved surface that is raised in a direction away from the light-emitting unit 20 and can also better reflect and refract light, which is beneficial to reduce the loss of light during propagation. The design of the curved surface is beneficial for the light-mixing shell 3 to better change the refraction and reflection path of the light emitted by the light-emitting unit 20, so that the light can be more evenly distributed in the light-mixing cavity, thereby enhancing the light-mixing effect. The range of light coverage is expanded by scattering, so that the light is more evenly distributed, the light loss is reduced, the light output angle is optimized, the front brightness and light energy utilization rate are improved, the uniform mixing of red light, green light, and blue light is promoted, and the color difference and color deviation are reduced. Compared with a planar structure, a curved surface can better break the straight-line propagation path of light and reduce the phenomenon of excessive or low local light intensity.

[0078] Continue to refer Fig. 9 , Fig.10 or Fig.11 The light-mixing housing 3 includes a top housing 31 and a side housing 32 . The top housing 31 includes a first surface M1 . The top housing 31 also includes a second surface M2 opposite to the first surface M1 .

[0079] One end of the side shell 32 is connected to the top shell 31 , and around the center axis Z of the top shell 31 , the side shell 32 and the second surface M2 of the top shell 31 form a receiving groove C; the other end of the side shell 32 is connected to the bottom plate 10 .

[0080] refer to Fig. 9 , Fig.10 or Fig.11 The above-mentioned “central axis Z of the top shell 31 ” refers to a straight line passing through the geometric center of the top shell 31 .

[0081] The top shell 31 and the side shell 32 of the light mixing shell 3 can be an integrally formed structure. Since there is no seam, the structure strength of the light mixing shell 3 is high and the sealing is good, which can prevent dust or moisture from entering the light mixing shell 3; secondly, the assembly steps of the light mixing shell 3 are reduced, which also improves the production efficiency and reduces the assembly time of the light mixing shell 3.

[0082] The top shell 31 and the side shell 32 of the light mixing shell 3 can also be connected in a split manner, that is, the top shell 31 and the side shell 32 adopt a split structure and are combined into an integral component through a subsequent connection process. In this way, the top shell 31 and the side shell 32 can be made of different materials to meet specific functional requirements. For example, the top shell 31 can be made of a high-strength and light-transmitting material, while the side shell 32 can be designed with a heat dissipation material.

[0083] In some embodiments, reference Figure 8 and Fig.12 , along the direction parallel to the plane where the bottom plate 10 is located, the cross-sectional shape of the receiving groove C is a square. Figure 8 and Fig.13 , along the direction parallel to the plane where the bottom plate 10 is located, the cross-sectional shape of the receiving groove C is circular. In other embodiments, along the direction parallel to the plane where the bottom plate 10 is located, the cross-sectional shape of the receiving groove C may also include a rectangular ellipse or a regular hexagon.

[0084] Continue to refer Fig. 9 , Fig.10 or Fig.11 The thickness of the top shell 31 gradually decreases from the central axis Z of the top shell 31 to the edge of the top shell 31, which can optimize the refraction and scattering of light, making the light distribution more uniform during the light mixing process, avoiding the phenomenon of local overbrightness or overdarkness. It also helps to achieve a smooth transition of light, so that the light in different areas of the light mixing shell 3 can be better integrated, improving the overall light mixing effect.

[0085] Continue to refer Fig. 9 , Fig.10 or Fig.11 , the thickness of the side shell 32 is equal, and the thickness of the side shell 32 refers to the size of the side shell 32 along the plane parallel to the bottom plate 10. Such uniform thickness can ensure that the side shell 32 is evenly distributed when subjected to force, thereby improving the stability and deformation resistance of the overall structure. Secondly, the uniform thickness also contributes to the uniform conduction and dissipation of heat, avoids local overheating, and improves the heat dissipation performance of the mixed light shell. In some embodiments, the haze range of the mixed light shell 3 is 40% to 60%. For example, the haze range of the mixed light shell 3 is 40%, 45%, 50%, 55% or 60%. The haze of the mixed light shell 3 can effectively scatter light within this range, avoid local overbrightness of the mixed light shell 3, and facilitate more uniform light distribution.

[0086] Exemplary, reference Fig.14 The top shell 31 of the light-mixing shell 3 includes a first part AA and at least one second part BB, the second part BB surrounds the first part AA, the first part AA is connected to a second part BB, and the haze of the first part AA is greater than the haze of the second part BB. The center of the first part AA coincides with the center of the second part BB. Since the first part AA is located in the central part of the light-mixing shell 3, the high haze of the central part helps the light-mixing shell 3 to scatter light better. When the light is emitted from the light-emitting unit 20 and passes through the first part AA of the light-mixing shell 3, the first part AA with high haze can make the light more evenly distributed in all directions, which is helpful to avoid the generation of obvious light spots in the light-mixing shell 3. Among them, haze refers to the ratio of the scattered light flux that deviates from the direction of parallel light when parallel light enters a transparent object to the total transmitted light flux.

[0087] For example, refer to Fig.14 The top shell 31 of the light mixing shell 3 includes a first part AA and a second part BB, the second part BB surrounds the first part AA, and the haze of the first part AA is about 10% higher than the haze of the second part BB. For example, the haze of the first part AA is 9%, 10% or 11% higher than the haze of the second part BB.

[0088] For example, refer to Fig.15 The top shell 31 of the light-mixing shell 3 includes a first part AA and a plurality of second parts BB, the plurality of second parts BB are sequentially arranged and sequentially connected along a first direction X, the first direction X is a radial direction of the first part AA and a direction away from the first part AA; along the first direction X, the haze of the plurality of second parts BB gradually decreases. In this way, through the design of gradually decreasing haze, the scattering and transmission of light can be effectively controlled, the light distribution can be made more uniform, and the overall light effect of the light-mixing shell 3 can be improved.

[0089] In some embodiments, a light diffuser is distributed in at least the top shell 31 of the light-mixing shell 3. For example, a light diffuser is distributed in the top shell 31. Or a light diffuser is distributed in both the top shell 31 and the side shell 32. The light diffuser can scatter light so that the light is evenly distributed inside the top shell 31 and the side shell 32, avoiding the phenomenon of partial overbrightness or overdarkness, and improving the uniformity of the display effect.

[0090] In some embodiments, the light diffuser forms a plurality of island structures in the light mixing shell 3, and the plurality of island structures are evenly distributed. Since the island structures formed by the light diffuser can effectively scatter light, the light is evenly distributed in the light mixing shell 3, thereby preventing the light from being concentrated or locally too bright in the light mixing shell.

[0091] The “light diffuser forms a plurality of sea-island structures” means that the light diffuser is uniformly dispersed in the material of the light mixing shell 3 in the form of tiny particles or regions.

[0092] In some embodiments, the particle size of the light diffuser located in the first part AA of the top shell 31 is smaller than the particle size of the light diffuser located in the second part BB of the top shell 31. This makes the haze of the first part AA of the top shell 31 higher than the haze of the second part BB of the top shell 31. Therefore, by distributing light diffusers of different particle sizes, the light propagation path of the entire top shell 31 can be optimized, so that the brightness and color of the light-emitting substrate 200 are more uniform, avoiding the problem of light spots or uneven brightness on the surface of the mixed light shell 3, and improving the overall display effect.

[0093] Exemplarily, the particle size of the light diffuser located in the first portion AA of the top shell 31 is 2 μm to 3 μm, for example, 2 μm, 2.5 μm, 2.8 μm or 3 μm.

[0094] Exemplarily, the particle size of the light diffuser located in the second portion BB of the top shell 31 is 3 μm to 5 μm, for example, 3 μm, 3.5 μm, 3.8 μm, 4.5 μm or 5 μm.

[0095] When the top shell 31 includes multiple second parts BB, the particle size of the light diffuser in the multiple second parts BB gradually increases along the first direction X. The gradual increase in the particle size of the light diffuser can optimize the scattering effect of light, make the light more evenly distributed in the light mixing shell 3, and avoid the phenomenon of local over-brightness or over-darkness. Secondly, the gradual change design of the particle size of the light diffuser also helps to achieve a smooth transition of light, so that the light in different areas of the light mixing shell 3 is better integrated, thereby improving the light mixing effect of the light mixing shell 3. It can also reduce the loss of light in the propagation process, improve the light efficiency utilization rate, and ensure that more light is effectively utilized.

[0096] Specifically, the mixed light shell 3 includes a substrate layer, in which quantum dots and an inorganic light diffuser are added, or quantum dots and an organic light diffuser are added. The material of the substrate layer includes at least one of polystyrene (PS), polycarbonate (PC), polypropylene (PP) and polymethyl methacrylate (PMMA).

[0097] For example, the material of the substrate layer of the mixed light shell 3 includes: polystyrene and polycarbonate; or, polypropylene and polymethyl methacrylate; or, polycarbonate and polypropylene (PP); or, polystyrene, polycarbonate and polypropylene; or, polystyrene, polycarbonate and polymethyl methacrylate; or, polystyrene, polycarbonate, polypropylene and polymethyl methacrylate.

[0098] The above-mentioned “the haze of the first part AA is greater than the haze of the second part BB” means that the light diffusing agent concentration of the first part AA is higher than that of the second part BB. Since the concentration of the diffusing agent added to the light mixing shell 3 is different, it will affect the uniformity of the light mixing shell 3, so the atomization effect of the light mixing shell 3 can be adjusted by adjusting the diffusing agent of different concentrations in the light mixing shell 3. The haze of the first part AA and the haze of the second part BB can be adjusted and designed according to the actual light mixing effect, and are not limited.

[0099] Exemplarily, the haze of the first part AA is 50% to 70%, and the haze of the second part BB is 40% to 60%. For example, when the haze of the first part AA is 50%, the haze of the second part BB can be 40%; for another example, when the haze of the first part AA is 55%, the haze of the second part BB can be 45%; for another example, when the haze of the first part AA is 60%, the haze of the second part BB can be 50%; for another example, when the haze of the first part AA is 70%, the haze of the second part BB can be 60%. Among them, the haze of the first part AA and the haze of the second part BB can also be other parameters, which can be designed according to actual needs and are not limited.

[0100] For example, the haze of a circular area 5 mm away from the center of the light mixing shell 3 is 50%-70%. Since the first part AA is usually the part where the light is most concentrated, haze control is crucial to light distribution and light mixing effects. The higher the haze of the first part AA, the stronger the scattering, making the light of the first part AA more dispersed, which can avoid the light from the light mixing shell 3 being a light spot with high central brightness.

[0101] In some embodiments, reference Fig.17 , the range of the radius of curvature R1 of the curved surface of the mixing light shell 3 is 355.56mm~471.75mm. The radius of curvature R1 of the curved surface is a quantity that describes the degree of curvature of the curved surface at a certain point. For example, the radius of curvature R1 of the curved surface of the mixing light shell 3 is 355.56mm, 360mm, 370mm, 380mm, 400mm, 450mm, 460mm or 471.75mm. The radius of curvature R1 of the curved surface of the mixing light shell 3 within this range is conducive to controlling the scattering angle of the light of the light-emitting unit 20, so that light from different directions can be mixed, so that the light can smoothly transition between the central area AA and the edge area BB, avoiding the appearance of obvious light-dark dividing lines on the mixing light shell 3, and can effectively guide the light to diffuse evenly from the light-emitting unit 20, avoiding the light from being concentrated at a certain point or a certain area of ​​the mixing light shell 3, and achieving a more uniform light mixing effect.

[0102] Among them, when the curvature radius R1 of the curved surface of the light mixing shell 3 is within the range of 355.56mm to 471.75mm, the light mixing distance of the backlight module formed by the light emitting substrate 200 can reach 6mm to 8mm. The curvature radius R1 of the curved surface of the light mixing shell 3 can be adjusted according to the light mixing distance of the backlight module, and is not limited.

[0103] In some embodiments, continue to refer to Fig.14 , Fig.15 or Fig.16 The side shell 32 includes a first end face D1 for connecting to the bottom plate 10; along the circumference of the accommodating groove C, the first end face D1 of the side shell 32 is provided with a plurality of spaced protrusion structures T, and the side walls opposite to the adjacent protrusion structures T form a heat dissipation channel M with the first end face D1; the first end face D1 of the side shell 32 is connected to the bottom plate 10 through the protrusion structure M.

[0104] The heat dissipation channel M can quickly conduct away the heat generated by the light-emitting unit 20 when it is working, avoid the heat from accumulating for a long time inside the light-mixing shell 3, and effectively reduce the temperature of the light-emitting unit 20 and the light-mixing shell 3, so that it can not only ensure the stability of the optical performance of the light-emitting unit 20, but also extend the service life of the light-emitting unit 20. In addition, since the excessive temperature may also cause the optical properties of the material of the light-mixing shell 3 to change (such as increased haze or decreased transmittance), it can avoid the material of the light-mixing shell 3 from aging or deformation due to long-term high temperature, which helps to maintain the optical performance of the light-mixing shell 3 and extend the service life of the light-mixing shell 3.

[0105] Exemplarily, the height of the protruding structure T can be 0.8 mm to 1.2 mm, that is, the height of the heat dissipation channel M is 0.8 mm to 1.2 mm. For example, the height of the protruding structure T is 1 mm, which can ensure the heat dissipation effect while facilitating light mixing between the light-emitting units 20 in the light mixing shell 3.

[0106] Continue to refer Fig. 9 , Fig.10 or Fig.11 , the distance from the bottom surface of the accommodating groove C to the light-emitting unit 20 is H. This is conducive to providing sufficient space for the light emitted by the light-emitting unit 20 to scatter, so that the light can be better integrated and more evenly cover the entire light mixing area, avoiding the light from being directly concentrated in a certain area, and achieving a more uniform light mixing effect.

[0107] In some embodiments, reference may be made to Fig.18, a light-mixing shell 3 is provided with a plurality of light-emitting units 20, and the plurality of light-emitting units 20 are arranged in a matrix. The light-mixing shell 3 is also arranged in a matrix. For example, a light-mixing shell 3 is provided with two light-emitting units 20; or, a light-mixing shell 3 is provided with three light-emitting units 20; or, a light-mixing shell 3 is provided with four light-emitting units 20; or, a light-mixing shell 3 is provided with six light-emitting units 20. The number of light-emitting units 20 provided with a light-mixing shell 3 can be designed according to design requirements, and there is no specific limitation.

[0108] In this way, the light emitted by multiple light-emitting units 20 can be superimposed and mixed in the light-mixing shell 3. Since the number of light-emitting units 20 is large and the distribution is uniform, the light emitted by them can be more fully mixed in the light-mixing shell 3, achieving a more uniform light distribution, which can effectively reduce the light spots that may be generated by the light emission of a single light-emitting unit 20. In addition, the light-emitting units 20 arranged in a matrix can cover a larger area, making the light distribution more uniform and avoiding the phenomenon of local over-brightness or over-darkness.

[0109] The luminous intensity of the near light field of the luminous unit 20 changes with the luminous angle as shown in Fig.19 As shown, specifically, the luminous intensity of the near light field of the luminous unit 20 decreases with the increase of the luminous angle. When the distance between the luminous units 20 is limited by the luminous angle, when the luminous angle of the luminous unit 20 is 65° to 85°, it is beneficial for the mutual mixing of light between the multiple luminous units 20 in the light mixing shell 3. For example, the luminous angle of the luminous unit 20 is 65°, 66°, 68°, 70°, 75°, 78°, 80°, 82°, 83° or 85°.

[0110] In some embodiments, a suitable structure and size of the light-mixing housing 3 may be selected according to the number, arrangement, and positional relationship of the light-emitting units 20 .

[0111] For example, reference may be made to Fig. 9 and Fig. 20 , the distance between adjacent light emitting units 20 in the receiving groove C is P, the distance from the bottom surface of the receiving groove C to the light emitting unit 20 is H, P=k×H, and the value range of k is 4.28~7.47.

[0112] For example, the value range of k is 4.28, 4.5, 4.8, 5, 6.2, 6.5, 6.8, 7, 7.2 or 7.47.

[0113] The calculation process of the distance between adjacent light-emitting units 20 in the receiving groove C is as follows: That is γ is the light-emitting angle when the light mixing effect is best when multiple light-emitting units 20 mix light, and the value range of γ is 65° to 85°. Substituting the value range of γ, it can be obtained that the value of k is 4.28 to 7.47.

[0114] For example, refer to Fig.21 , the minimum distance between adjacent light-emitting units 20 in the receiving groove C Among them, H is the distance from the bottom surface of the receiving groove C to the light-emitting unit 20, that is, the height of the receiving groove C; α is the minimum light-emitting angle when the light-emitting unit 20 has a good light mixing effect, and the value range of α is between 65° and 68°. For example, the value of α is 65°, 66°, 67° or 68°. In this way, it can be ensured that the light of the light-emitting unit 20 located in a receiving groove C fully overlaps on the surface of the base plate 10, and the coverage range of the light on the base plate 10 is maximized, avoiding dark areas caused by too large a spacing between the light-emitting units 20, or bright spots caused by too small a spacing, while avoiding reducing the redundant design between the light-emitting units 20, which causes waste of light.

[0115] For example, refer to Fig.21 , the maximum distance between adjacent light emitting units 20 in the receiving groove C β is the maximum light-emitting angle when the light-mixing effect of the light-emitting unit 20 is good, and the value range of β is between 83° and 85°. For example, the value of β is 82°, 83°, 84° or 85°. In this way, it can be ensured that the light of the light-emitting unit 20 located in a receiving groove C fully overlaps on the surface of the base plate 10, ensuring that the coverage range of the light on the base plate 10 is maximized, avoiding dark areas caused by too large a spacing between the light-emitting units 20, or bright spots caused by too small a spacing, and at the same time avoiding reducing the redundant design between the light-emitting units 20, which causes waste of light.

[0116] In some embodiments, a light-mixing shell 3 is provided with a plurality of light-emitting units 20, and the plurality of light-emitting units 20 are arranged in a matrix; the plurality of light-emitting units 20 are centrally symmetrical about a first reference point, and the projection of the center of the first part AA of the top shell 31 on the bottom plate 10 coincides with the first reference point. The first reference point refers to the center of the geometric figure surrounded by the plurality of light-emitting units 20. Due to the centrally symmetrical arrangement, the light can be evenly diffused from the center to the surroundings, and the light intensity of the entire display area can be better balanced.

[0117] Exemplary, reference Fig. 22 , a light mixing shell 3 covers four light emitting units 20, and the four light emitting units 20 are arranged in a matrix of two rows and two columns; the four light emitting units 20 are symmetrical about the center of the first reference point O. The base of the light mixing shell 3 has a diameter R of 150 mm, and the height of the light mixing shell 3 is 5 mm to 6 mm, for example, 5 mm. The receiving groove C is a square groove with a side length L of 100 mm and a height H of 2 mm. The value of α is 65°, and the value of β is 85°. In this case, the minimum distance P between two adjacent light emitting units 20 of the four light emitting units 20 min =8.57mm; maximum distance P max=45.7mm. That is, the distance P between two adjacent light emitting units 20 among the four light emitting units 20 is between 8.57mm and 45.7mm, such as 9mm, 10mm, 20mm, 30mm, 40mm or 44mm. At this time, the light mixing effect between the four light emitting units 20 in the light mixing housing 3 is the best.

[0118] Exemplary, reference Fig.23 A light mixing shell 3 covers three light emitting units 20 , and the three light emitting units 20 are arranged in an equilateral triangle; the three light emitting units 20 are symmetrical about the first reference point O.

[0119] In some embodiments, the diameter of the first part AA of the light-mixing shell 3 is m, where m=Pb×H, and the value range of b is 4.288 to 22.86. This not only makes the structure of the light-mixing shell 3 more compact, but also reduces the loss of light during propagation, improves light efficiency, and ensures that more light is effectively utilized.

[0120] For example, the value of b is 4.288, 5, 5.2, 6, 6.5, 10.2, 12.5, 16.5, 20, or 22.86.

[0121] refer to Fig.24 The calculation process of the diameter m of the first part AA of the light mixing shell 3 can be: m=P-2×H×tanγ, so b=2×tanγ. Since the value range of γ is 65° to 85°, the value of b is 4.288 to 22.86.

[0122] For example, continue to refer to Fig.24 , a light-mixing shell 3 is provided with four light-emitting units 20, and the four light-emitting units 20 are arranged in a matrix of two rows and two columns. The distance between adjacent light-emitting units 20 in the receiving groove C is P, and H is the distance from the bottom surface of the receiving groove C to the light-emitting unit 20. Then the diameter m of the first part AA of the light-mixing shell 3 = P-2×H×tanγ. In this case, the ratio of the diameter m of the first part AA to the range of the curvature diameter of the curved surface of the light-mixing shell 3 is [(P-2×H×tanγ) / 2×R]%.

[0123] Since the curvature radius R1 of the curved surface of the light mixing shell 3 is in the range of 355.56 mm to 471.75 mm, and the light emitting angle γ is between 65° and 85°, it is beneficial to light mixing in the light mixing shell 3. The distance from the bottom surface of the accommodating groove C to the light emitting unit 20 is 2 mm. In this case, the minimum value of the ratio of the diameter m of the first part AA to the curvature diameter of the curved surface of the light mixing shell 3 is [(P-45.72) / 943.5]%, and the maximum value is [(P-8.576) / 711.12]%.

[0124] In some embodiments, reference Fig. 9 , Fig.10 or Fig.11 At least one quantum dot is distributed on the surface or inside of the light-mixing shell 3. Each quantum dot is used to emit light of a preset color under the excitation of the light emitted by the light-emitting unit 20. The light emitted by at least one quantum dot and the light emitted by the light-emitting unit 20 can synthesize white light. In this way, by distributing the quantum dots 33 on the surface or inside of the light-mixing shell 3, the light emitted by the light-emitting unit 20 will interact with the quantum dots 33 when passing through the light-mixing shell 3. Since different types of quantum dots 33 can convert light of different wavelengths, the conversion and mixing of light colors are achieved, while covering a wider color gamut and enhancing the light mixing effect. In this way, multiple light-emitting units 20 can form a surface light source after passing through the light-mixing shell 3. Among them, the quantum dots 33 are distributed on the surface or inside of the light-mixing shell 3, that is, the quantum dots 33 cover the light radiation surface of the light-emitting unit 20.

[0125] Among them, the quantum dots 33 include red quantum dots and green quantum dots. In this way, when the blue light emitted by the light-emitting unit 20 passes through the quantum dot layer, part of the blue light will be converted into red light by the red quantum dots, and part of the blue light will be converted into green light by the green quantum dots. These converted lights together with the unconverted blue light constitute white light. When the light emitted from adjacent light-mixing shells 3 is mixed with each other, due to the adjustability and high brightness of the light emitted by the quantum dots 33, these lights can be mixed more evenly to form a surface light source. This surface light source has better uniformity and color consistency, thereby improving the display quality of the light-emitting substrate 200.

[0126] By distributing the quantum dots 33 on the surface or inside of the mixing shell 3, the light emitted by the light-emitting unit 20 will interact with the quantum dots 33 when passing through the mixing shell 3. Since different types of quantum dots 33 can convert light of different wavelengths, the conversion and mixing of light colors are achieved, which enhances the mixing effect while covering a wider color gamut. In this way, multiple light-emitting units 20 can form a surface light source after passing through the mixing shell 3.

[0127] Exemplary, reference Fig. 9 , the first surface M1 of the light-mixing shell 3 is provided with a film layer 330 including quantum dots 33. Alternatively, the first surface M1 of the light-mixing shell 3 is a film layer 330 formed of quantum dots 33. Alternatively, a film layer 330 including quantum dots 33 is additionally provided on the first surface M1 of the light-mixing shell 3, so that the light emitted by the multiple light-emitting units 20 covered by the light-mixing shell 3 can be mixed in the film layer 330 including quantum dots 33 to form a white light surface light source.

[0128] Exemplary, reference Fig.10Quantum dots 33 are distributed inside the light mixing shell 3. In this way, the light emitted by the multiple light emitting units 20 covered by the light mixing shell 3 is directly mixed in the light mixing shell 3 to form a white light surface light source, so that the three colors of green light, red light and blue light are mixed more fully and the image quality effect is better.

[0129] Exemplary, reference Fig.11 At least the bottom surface of the receiving groove C is provided with a film layer 330 including quantum dots 33. In this way, the light emitted by the multiple light-emitting units 20 covered by the light-mixing shell 3 can be mixed in the film layer 330 including quantum dots 33 to form a white light surface light source.

[0130] For example, a film layer 330 including quantum dots 33 is disposed on the bottom surface of the receiving groove C. Alternatively, a film layer 330 including quantum dots 33 is disposed on the bottom surface and the groove wall of the receiving groove C.

[0131] The bottom surface of the receiving groove C of the light-mixing shell 3 may be a film layer 330 including quantum dots 33. The bottom surface of the receiving groove C of the light-mixing shell 3 may be additionally provided with a film layer 330 including quantum dots 33.

[0132] In some embodiments, the red quantum dots and green quantum dots located in the first part AA of the top shell 31 of the mixed light shell 3 are evenly distributed, and the red quantum dots and green quantum dots located in the second part BB of the top shell 31 of the mixed light shell 3 are evenly distributed, and the density of the red quantum dots and green quantum dots located in the second part BB is equal to the density of the red quantum dots and green quantum dots located in the first part AA. In this way, the red quantum dots and green quantum dots are evenly distributed in the first part AA and the second part BB, and the density is the same, which can ensure that the light emission of the entire top shell 31 is uniform, avoiding uneven brightness or color difference; and the evenly distributed quantum dots help to maintain color consistency, whether it is the first part AA or the second part BB, the displayed color can be consistent, improving the visual effect; in addition, it simplifies the manufacturing process, reduces the difficulty and cost of production, and improves the consistency and yield of the product; it also helps to improve the stability of the light-emitting unit 20, reduce hot spots and local aging caused by uneven distribution of red quantum dots and green quantum dots, and extend the service life of the light-emitting unit 20.

[0133] In some embodiments, the red quantum dots and green quantum dots in the first part AA of the top shell 31 of the light-mixing shell 3 are evenly distributed, and the red quantum dots and green quantum dots in the second part BB of the top shell 31 of the light-mixing shell 3 are evenly distributed, and the density of the red quantum dots and green quantum dots in the second part BB is greater than the density of the red quantum dots and green quantum dots in the first part AA. Since the light efficiency of the second part BB is usually lower than that of the first part AA, the first part AA is usually brighter than the second part BB. By increasing the density of the red quantum dots and green quantum dots in the second part BB, the brightness difference between the first part AA and the second part BB can be balanced to achieve a more uniform display brightness.

[0134] Continue to refer Fig. 9 , Fig.10 or Fig.11 The light-emitting substrate 200 further includes: a reflective sheet 40, which is stacked on the bottom plate 10, and the multiple light-mixing shells 3 and the multiple light-emitting units 20 are fixed on the side of the reflective sheet 40 away from the bottom plate 10. When the multiple light-emitting units 20 emit light, the light will spread to all directions, so there is a situation where the light is irradiated on the bottom plate 10. Adding the reflective sheet 40 on the bottom plate 10 can reflect the light irradiated on the bottom plate 10, thereby improving the utilization rate of light.

[0135] When the light-emitting substrate 200 further includes a reflective sheet 40 , the light-mixing shell 3 can be fixed to the reflective sheet 40 by glue. Specifically, glue can be applied on the surface of the protruding structure T of the light-mixing shell 3 to fix the protruding structure T to the reflective sheet 40 .

[0136] The embodiment of the present disclosure also provides a backlight module 100. Fig.25 The backlight module 100 includes: a light emitting substrate 200 as described in any of the above embodiments, and a diffusion plate 50 disposed on the light emitting side of the light emitting substrate 200. The diffusion plate 50 can disperse the concentrated light to various directions to improve the uniformity of the brightness of the display area of ​​the backlight module 100.

[0137] The backlight module 100 provided in the above embodiment, since in the light-emitting substrate 200, multiple light-emitting units 20 can form a surface light source with a high color gamut after passing through the light-mixing shell 3, and then pass through the diffusion plate 50 for secondary light mixing, the uniformity of the overall picture is further improved, and the brightness of the backlight module 100 is improved. In this way, the distance between the diffusion plate 50 and the bottom plate 10 of the light-emitting substrate 200 can be reduced, that is, the light-mixing distance D is reduced, thereby reducing the thickness of the backlight module 100, and improving the picture quality of the backlight module 100 while achieving a wide color gamut.

[0138] In some embodiments, the light-emitting substrate 200 in the backlight module 100 further includes: a reflective sheet 40, which is stacked on the bottom plate 10, and a plurality of light-emitting units 20 and a plurality of light-mixing shells 3 are fixed to a side of the reflective sheet 40 away from the bottom plate 10; the distance between the diffuser 50 and the reflective sheet 40 is inversely proportional to the haze of the light-mixing shell 3. In order to achieve the purpose of designing the backlight module 100 to be thin and light-weight, a light-mixing shell 3 with high haze is selected to reduce the distance between the diffuser 50 and the reflective sheet 40.

[0139] In some embodiments, the haze of the diffuser 50 is 55% to 65%, such as 55%, 60% or 65%. In this way, the diffuser 50 can disperse the light of the plurality of light emitting units 20 in different directions, which is beneficial to the uniform distribution of the light.

[0140] The diffuser 50 includes a substrate layer and a diffusant in the substrate layer, and the diffusant is evenly distributed in the substrate layer in the form of tiny particles. After light enters the diffuser, when passing through the tiny diffusant particles inside the diffuser, the light diffusant particles can disperse the light in different directions, changing the original straight-line propagation to multi-directional propagation, which is conducive to the uniform distribution of light.

[0141] Wherein, the material of the substrate layer includes at least one of polystyrene (PS), polycarbonate (PC), polypropylene (PP) and polymethyl methacrylate (PMMA). For example, the material of the substrate layer includes polystyrene, polycarbonate, polypropylene or polymethyl methacrylate. Alternatively, the material of the substrate layer includes polystyrene and polycarbonate. Alternatively, the material of the substrate layer includes polystyrene and polypropylene. Alternatively, the material of the substrate layer includes polystyrene and polymethyl methacrylate. Alternatively, the material of the substrate layer includes polystyrene, polycarbonate and polypropylene. Alternatively, the material of the substrate layer includes polystyrene, polycarbonate and polymethyl methacrylate. Alternatively, the material of the substrate layer includes polystyrene, polycarbonate and polypropylene. Alternatively, the material of the substrate layer includes polystyrene, polycarbonate and polymethyl methacrylate. Alternatively, the material of the substrate layer includes polycarbonate, polypropylene and polymethyl methacrylate. Alternatively, the material of the substrate layer includes polystyrene, polycarbonate, polypropylene and polymethyl methacrylate.

[0142] The material of the diffusant includes inorganic diffusant or organic diffusant. Inorganic diffusant includes silicon dioxide (SiO 2 ), calcium carbonate (CaCO 3 ), etc. Organic diffusants include acrylic microspheres, polystyrene microspheres, etc.

[0143] In some embodiments, continue to refer to Fig.25 The backlight module 100 also includes: an optical film layer 70, which is arranged on the side of the diffusion plate 50 away from the light-emitting substrate 200. The optical film layer 70 includes: a prism sheet, a reflective polarized brightness enhancement film and a composite film stacked in sequence along the direction away from the light-emitting substrate 200.

[0144] The prism sheet can concentrate the scattered light to emit in a direction perpendicular to the light emitting substrate 200 , which is beneficial to reduce the lateral loss of light and improve the front brightness of the backlight module 100 .

[0145] The reflective dual brightness enhancement film (DBEF) allows light with the same polarization direction as the display panel to pass through, and reflects inconsistent light back to the backlight module 100 for reuse after multiple reflections, thereby further improving the brightness of the backlight module 100.

[0146] The composite film can adjust the propagation path of light and optimize the distribution of light as needed.

[0147] In this way, the optical film layer 70, through the coordinated work between the prism, the reflective polarized brightening film and the composite film, is conducive to reducing unnecessary light leakage and interference, improving the shielding property of the backlight module 100, and enabling the backlight module 100 to achieve higher brightness, better uniformity, wider color gamut and lower power consumption, thereby improving the overall display quality of the backlight module 100.

[0148] In some embodiments, the diffusion plate 50 has a thickness of 1.0T to 1.3T, for example, 1.0T, 1.2T or 1.3T.

[0149] For example, when the thickness of the diffuser 50 is 1.2T, the light mixing distance D can be as small as 10 mm, and when the light mixing shell 3 is evenly arranged as a whole, the backlight module 100 of this embodiment, that is, the optical simulation diagram of the backlight module 100 including the light mixing shell 3 is as follows: Fig.26 As shown, the optical simulation diagram of the backlight module 100 without the light mixing shell 3 is as shown in FIG. Fig. 27 As shown in the combined comparison, it can be seen that the backlight module 100 including the light mixing shell 3 can achieve a uniform optical effect of 90% while reducing the light mixing distance D, meeting the requirements for picture uniformity and achieving a good light mixing effect.

[0150] The embodiment of the present disclosure further provides a display device 1000, referring to Fig.28 , comprising: the backlight module 100 described in the above embodiment, a display panel OC and a middle frame 80. The display panel OC is arranged on the light-emitting side of the backlight module 100. The middle frame 80 is provided with a receiving portion, and the display panel OC is arranged in the receiving portion.

[0151] The specific structure of the backlight module 100 may refer to the description of the backlight module 100 in the above embodiment, which will not be described in detail here.

[0152] The display panel OC includes an array substrate, a color filter substrate, a liquid crystal layer, a first polarizer, and a second polarizer. The array substrate and the color filter substrate are arranged opposite to each other, the liquid crystal layer is filled between the color filter substrate and the array substrate, the first polarizer is arranged on a side of the array substrate away from the color filter substrate, and the second polarizer is arranged on a side of the color filter substrate away from the array substrate.

[0153] Continue to refer Fig.28 The main function of the middle frame 80 is to support the display panel OC, and a reflective film is usually attached to one side of the inner wall of the middle frame 80 to improve the utilization rate of light.

[0154] The material of the middle frame 80 may be plastic, aluminum profile or iron plate.

[0155] Since the light mixing shell 3 in the light emitting substrate 200 is provided with quantum dots 33, the light emission spectrum of the quantum dots 33 is very narrow, and the monochromatic spectrum obtained after the white light formed by the light mixing is filtered by the color film substrate of the display panel OC is also very narrow, so that the purity of the monochrome picture of the display device 1000 is high. Compared with the use of the quantum dot film 60, the display device 1000 provided in this embodiment avoids the phenomenon that the edge of the picture is visually blue due to the isotropic scattering of red light and green light, or the light emitting surface corresponding to a single area is displayed as a non-uniform color spot with a white center and a yellowish edge. The display device 1000 provided in this embodiment can improve the picture quality while achieving a wide color gamut.

[0156] In some embodiments, the display device 1000 further includes a front frame, which is connected to the middle frame 80. Part of the front frame is disposed on a side of the display panel OC away from the backlight module 100, and part of the front frame is disposed on a side of the display panel OC close to the backlight module 100. After the front frame is connected to the middle frame 80, the display panel OC can be fixed in multiple directions, thereby reducing the risk of displacement of the display panel OC due to external impact or vibration.

[0157] In some embodiments, the front frame is arranged around the display panel OC and the backlight module 100, and at least a portion of the front frame is opposite to the side of the display panel OC and the side of the backlight module 100; when the display device 1000 is impacted from the side, the front frame can directly absorb and disperse the stress, protect the edges of the display panel OC and the backlight module 100, and reduce the risk of fragmentation or delamination.

[0158] The display device 1000 can be applied to electronic products with display functions, such as mobile phones, tablets, computers, and televisions.

[0159] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be thought of by any person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A light-emitting substrate, characterized in that: include: Base plate; A plurality of light-emitting units are arranged on one side of the bottom plate; A plurality of light-mixing shells, one of which is disposed on the light-emitting side of at least one of the light-emitting units; The light-mixing housing has a receiving groove, the notch of the receiving groove faces the bottom plate, and at least one of the light-emitting units is arranged in the receiving groove.

2. The light-emitting substrate according to claim 1, characterized in that: The light-mixing shell includes a first surface, which is a surface of the light-mixing shell away from the light-emitting unit, and is a curved surface convex in a direction away from the light-emitting unit.

3. The light-emitting substrate according to claim 2, characterized in that: The light-mixing shell includes a top shell and a side shell, the top shell includes the first surface, and the top shell also includes a second surface opposite to the first surface; One end of the side shell is connected to the top shell and surrounds the central axis of the top shell, and the second surface of the side shell and the top shell forms the receiving groove; The other end of the side shell is connected to the bottom plate.

4. The light-emitting substrate according to claim 3, characterized in that: The side shell includes a first end surface for connecting to the bottom plate; Along the circumference of the accommodating groove, the first end surface of the side shell is provided with a plurality of spaced protrusion structures, and the side walls opposite to the adjacent protrusion structures and the first end surface form a heat dissipation channel; The first end surface of the side shell is connected to the bottom plate through the protruding structure.

5. The light-emitting substrate according to claim 3, characterized in that: The top shell includes a first portion and at least one second portion, the second portion surrounds the first portion, and the first portion is connected to one of the second portions; The haze of the first portion is greater than the haze of the second portion; In the case where the top shell includes a plurality of second parts, the plurality of second parts are arranged and connected in sequence along a first direction, wherein the first direction is a radial direction of the first part and a direction away from the first part; along the first direction, the haze of the plurality of second parts gradually decreases.

6. The light-emitting substrate according to claim 5, characterized in that: A light diffusing agent is distributed in at least the top shell of the light-mixing shell; The light diffuser forms a plurality of sea-island structures in the light-mixing shell, and the plurality of sea-island structures are evenly distributed; and / or, The particle size of the light diffusing agent located at the first portion of the top shell is smaller than the particle size of the light diffusing agent located at the second portion of the top shell.

7. The light-emitting substrate according to claim 5, characterized in that: A plurality of the light-emitting units are arranged in a matrix on one of the light-mixing shells; The plurality of light emitting units are centrally symmetrical about a first reference point, and a projection of a center of the first portion of the top case on the bottom plate coincides with the first reference point.

8. The light-emitting substrate according to claim 7, characterized in that: The distance between adjacent light-emitting units in the receiving groove is P, the distance from the bottom surface of the receiving groove to the light-emitting unit is H, P=k×H, and the value range of k is 4.28-7.

47.

9. The light-emitting substrate according to claim 8, characterized in that: The diameter of the first part is m, where m=Pb×H, and the value range of b is 4.288 to 22.

86.

10. The light emitting substrate according to any one of claims 1 to 9, characterized in that: At least one quantum dot is distributed on the surface or inside of the light-mixing shell, each of which is used to emit light of a preset color under the excitation of the light emitted by the light-emitting unit, and the light emitted by the at least one quantum dot and the light emitted by the light-emitting unit can synthesize white light.

11. The light emitting substrate according to claim 10, characterized in that: The light-mixing shell comprises a first surface, the first surface is a surface of the light-mixing shell away from the light-emitting unit, and the first surface is provided with a film layer comprising the quantum dots; or; At least the bottom surface of the containing groove is provided with a film layer including the quantum dots.

12. The light emitting substrate according to claim 10, characterized in that: The light-emitting unit is a blue light-emitting unit, and the quantum dots include red quantum dots and green quantum dots.

13. A backlight module, characterized in that: include: The light-emitting substrate according to any one of claims 1 to 12; A diffusion plate is arranged on the light emitting side of the light emitting substrate.

14. The backlight module according to claim 13, characterized in that: The light-emitting substrate further comprises: a reflective sheet stacked on the bottom plate, the plurality of light-emitting units and the plurality of light-mixing shells are all fixed to a side of the reflective sheet away from the bottom plate; The distance between the diffusion plate and the reflection sheet is inversely proportional to the haze of the light mixing shell.

15. A display device, characterized in that: include: The backlight module according to any one of claims 13 to 14; A display panel, arranged on the light-emitting side of the backlight module; The middle frame is provided with a receiving portion, and the display panel is arranged in the receiving portion.

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