Light-emitting substrate, backlight module and display device

Abstract

The embodiment of the utility model 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] This disclosure relates to the field of display technology, and in particular to a light-emitting substrate, a backlight module, and a display device. Background Technology

[0002] With the development of display technology, liquid crystal displays (LCDs) are used in various electronic products. Because the liquid crystal in an LCD does not emit light, a backlight module is needed to improve the brightness of the display. However, backlight modules suffer from poor light emission quality. Utility Model Content

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

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

[0005] On one hand, a light-emitting substrate is provided, which includes a base plate, a plurality of light-emitting units, and a plurality of light-mixing shells. The plurality of light-emitting units are disposed on one side of the base plate; among the plurality of light-mixing shells, one light-mixing shell covers 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 disposed in the receiving groove.

[0006] In the aforementioned 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 in which at least one light-emitting unit is disposed, the light-mixing shell facilitates multiple reflections and refractions of light within the light-mixing shell, resulting in a more uniform light distribution of the light-emitting unit, avoiding localized over-brightness or under-brightness, and improving the consistency of screen brightness. 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, which is a surface of the light-mixing shell away from the light-emitting unit, and the first surface is a curved surface that convexes in a direction away from the light-emitting unit.

[0008] In some embodiments, the light-mixing shell includes a top shell and a side shell. The top shell includes a first surface and 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. The second surface of the side shell and the top shell form the receiving 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 connection with the base plate; along the circumference of the receiving groove, the first end face of the side shell is provided with a plurality of spaced protrusions, and the sidewalls opposite to adjacent protrusions 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 protrusions.

[0010] In some embodiments, the top shell includes a first portion and at least one second portion, the second portion surrounding the first portion, the first portion being 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 portions, the plurality of second portions are arranged and connected sequentially along a first direction, the first direction being radial to the first portion and away from the first portion; along the first direction, the haze of the plurality of second portions gradually decreases.

[0011] In some embodiments, a light diffusing agent is distributed in at least the top shell of the light mixing shell; the light diffusing agent forms multiple island structures in the light mixing shell, the multiple island structures being uniformly distributed; and / or, the particle size of the light diffusing agent located in the first part of the top shell is smaller than the particle size of the light diffusing agent located in the second part of the top shell.

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

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

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

[0015] In some embodiments, at least one quantum dot is distributed on the surface or inside of the light-mixing shell. Each quantum dot is used to emit light of a preset color when excited by light emitted by the light-emitting unit. 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 light mixing shell includes a first surface, which is the surface of the light mixing 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] On the other hand, a backlight module is provided. It includes a light-emitting substrate as described in any of the above embodiments, and a diffuser plate disposed on the light-emitting side of the light-emitting substrate.

[0019] In some embodiments, the light-emitting substrate further includes: a reflective sheet, which is stacked on the base plate; the plurality of light-emitting units and the plurality of light-mixing shells are all fixed to the side of the reflective sheet away from the base 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, a display panel ring, and a middle frame as described in any of the above embodiments. The display panel is disposed on the light-emitting side of the backlight module, the middle frame has a receiving portion, and the display panel is disposed within the receiving portion.

[0021] The beneficial effects that the aforementioned backlight module and display device can achieve are the same as those that the aforementioned light-emitting substrate can achieve, and will not be repeated here. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.

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

[0024] Figure 2 This is a schematic diagram of the light field distribution of a light-emitting unit according to some embodiments;

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

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

[0027] Figure 5 for Figure 1 A schematic diagram of the light emission of the display device at a light mixing distance of 32mm;

[0028] Figure 6 for Figure 1 A schematic diagram of the light emission of the display device in the image when the light mixing distance is 10mm.

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

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

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

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

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

[0034] Figure 12 A bottom view of the light-mixing shell provided according to some embodiments;

[0035] Figure 13 A bottom view of the light-mixing shell provided according to some other embodiments;

[0036] Figure 14 This is a structural diagram of a light-mixing shell in an upright position according to some embodiments;

[0037] Figure 15 This is a structural diagram of the light-mixing shell in an upright position according to some other embodiments;

[0038] Figure 16 This is a structural diagram of an inverted light-mixing shell according to some embodiments;

[0039] Figure 17 This is a schematic diagram of the radius of curvature of a light-mixing shell according to some embodiments;

[0040] Figure 18 This is a schematic diagram of the arrangement of the light-mixing shell and the light-emitting unit according to some embodiments;

[0041] Figure 19 This is a schematic diagram showing the variation of luminous intensity of a light-emitting unit in the near-field as a function of the emission angle, according to some embodiments.

[0042] Figure 20 This is a schematic diagram illustrating the distance between adjacent light-emitting units according to some embodiments;

[0043] Figure 21 This is a schematic diagram showing the maximum and minimum distances between adjacent light-emitting units according to some embodiments;

[0044] Figure 22 This is a schematic diagram showing a light-emitting shell with multiple light-emitting units provided according to some embodiments;

[0045] Figure 23 This is a schematic diagram showing a light-emitting shell with multiple light-emitting units provided according to other embodiments;

[0046] Figure 24 This is a schematic diagram showing a light-emitting shell with multiple light-emitting units provided according to other embodiments;

[0047] Figure 25 This is a structural diagram of a backlight module provided according to some other embodiments;

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

[0049] Figure 27 An optical simulation diagram of a backlight module excluding a light-mixing housing, provided according to some embodiments;

[0050] Figure 28 This is a structural diagram of a display device provided according to some embodiments. Detailed Implementation

[0051] The technical solutions in some embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this disclosure are within the scope of protection of this disclosure.

[0052] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open-ended and encompassing, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0053] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" 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", both including the following combinations of A, B and C: only A, only B, only C, combinations of A and B, combinations of A and C, combinations of B and C, and combinations 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 “applies to” or “configured to” in this article implies an open and inclusive language that does not preclude applicability to or configuration to devices that perform additional tasks or steps.

[0057] In addition, the use of “based on” implies openness and inclusivity, because processes, steps, calculations or other actions “based on” one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0058] As used herein, “about,” “approximately,” or “approximately” includes the stated value and the average value within an acceptable range of deviation from the given value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the given quantity (i.e., the limitations of the measurement system).

[0059] As used herein, “parallel,” “perpendicular,” and “equal” include the described situation and situations that are similar to the described situation, within an acceptable deviation range, which is determined by those skilled in the art taking into account the measurement under discussion 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, where an acceptable deviation range for approximate parallelism may be, for example, within 5°; “perpendicular” includes absolute perpendicularity and approximate perpendicularity, where an acceptable deviation range for approximate perpendicularity may also be, for example, within 5°; “equal” includes absolute equality and approximate equality, where an acceptable deviation range for approximate equality may be, for example, a difference between the two equals being less than or equal to 5% of either one.

[0060] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.

[0061] This document describes exemplary embodiments with reference to cross-sectional views and / or plan views, which are idealized exemplary drawings. In the drawings, the thickness of layers and the area of ​​regions are enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as being limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. For example, etched areas shown as rectangular would typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the areas of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0062] Direct-lit backlighting is currently one of the most commonly used backlighting technologies in LCD panels. (Reference) Figure 1 This disclosure provides a display device 1000, including: a base plate 10, a plurality of light-emitting units 20, a first diffuser plate 41, a prism sheet 42, a second diffuser plate 43, and a display panel OC. The plurality of light-emitting units 20 are disposed on one side of the base plate 10, wherein each light-emitting unit 20 is encapsulated by a lens 30. The first diffuser 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 diffuser plate 43 mainly functions to atomize the light emitted from the prism sheet 42 and uniformly transmit the light to the display panel OC. Simultaneously, the second diffuser plate 43 also serves to 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, or LED, emits light in a spherical shape. (Reference) Figure 3 The lens 30, encapsulated on the light-emitting unit 20, can alter the light field distribution of the light-emitting unit 20. (Reference) Figure 4 The light intensity of the light-emitting unit 20 reaches its maximum at an emission angle of approximately 70°. The emission angle refers to the angle between the emitted ray from the light-emitting unit 20 and the normal, with the normal perpendicular to the plane of the base plate 10. Since the light-emitting unit 20 mixes light between the first diffuser plate 41 and the base plate 10, a certain mixing distance D is required. This mixing distance D is typically about 30mm, which achieves a 90% uniformity optical effect across nine points (see reference). Figure 5Nine-point uniformity refers to selecting nine points on a certain area or surface, requiring these points to achieve or nearly achieve uniformity in a certain metric or performance. If the mixing distance D decreases, for example, to 10mm, obvious lamp shadows will appear (see reference). Figure 6 This means that the thickness of the display device 1000 cannot be further reduced.

[0064] To address the aforementioned technical problems, embodiments of this disclosure provide a backlight module 100, with reference to... Figure 7 The backlight module 100 includes: a base plate 10, a reflective sheet 40, multiple light-emitting units 20, a diffuser plate 50, and a quantum dot film 60. The reflective sheet 40 is disposed on one side of the base plate 10, the multiple light-emitting units 20 are disposed on the side of the reflective sheet 40 away from the base plate 10, the diffuser plate 50 is disposed on the light-emitting side of the multiple light-emitting units 20, and the quantum dot film 60 is disposed on the side of the diffuser plate 50 away from the base plate 10.

[0065] Among them, multiple light-emitting units 20 are light-emitting units capable of emitting blue light. For example, the light-emitting unit 20 can be a mini light-emitting diode (Mini LED) or a micro light-emitting diode (Micro LED).

[0066] The reflector 40 reflects light emitted from the light-emitting unit 20 but not directly directed to the diffuser 50, ensuring light utilization and uniformity of the backlight module 100's output brightness. The quantum dot film 60 includes red and green quantum dots. The red quantum dots convert the blue light emitted by the light-emitting unit 20 into red light, and the green quantum dots convert the blue light emitted by the light-emitting unit 20 into green light. Thus, the combination of the blue-light-emitting unit 20 and the quantum dot film 60 can achieve a wide color gamut.

[0067] However, when this backlight module 100 is applied to a display device, on the one hand, referencing Figure 7 Since multiple light-emitting units 20 are capable of emitting blue light, after a single area of ​​light-emitting units 20 is lit, the blue light emitted by the light-emitting units 20 in that single area passes through the diffuser plate 50 and irradiates the quantum dot film 60. The quantum dot film 60 excites red and green light. Since the light-emitting units 20 are isotropic light sources, the downwardly scattered red and green light will spread towards the edge of the single area after repeated mixing between the diffuser plate 50 and the reflector 40. Finally, a non-uniform color spot with a white center and a yellowish edge will be formed, and the area of ​​the spot is larger than the area of ​​the light-emitting units in that single area.

[0068] On the other hand, reference Figure 8The brightness distribution of the light-emitting surface of the backlight module 100 can theoretically be decomposed into the superposition of numerous individual light spots. Since the light-emitting surface corresponding to each individual area displays a non-uniformly colored light spot with a white center and yellowish edges, after the light spots are superimposed, the yellow light reaching the edge areas is relatively less than that in the center areas, so the edges of the image appear visually bluish. For example... Figure 8 As shown, there is a bluish area about 50mm around the white image.

[0069] Therefore, the backlight module 100 provided by the above embodiment has poor light emission quality.

[0070] To solve the above-mentioned technical problems, embodiments of this disclosure provide a light-emitting substrate 200, with reference to... Figure 9 , Figure 10 or Figure 11 The light-emitting substrate 200 includes: a base 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 disposed on one side of the base plate 10; among the plurality of light-mixing shells 3, one light-mixing shell 3 covers 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 disposed in the receiving groove C.

[0071] For example, refer to Figure 9 , Figure 10 or Figure 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; 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 can be 1, 2, or 4. The number of light-emitting units 20 covered by the light-mixing shell 3 can be set according to the actual situation, and the specific number is not limited.

[0073] In the light-emitting substrate 200 provided in this 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 in which at least one light-emitting unit 20 is disposed, the light-mixing shell 3 helps the light to be reflected and refracted multiple times inside the light-mixing shell 3, making the light distribution of the light-emitting unit 20 more uniform, avoiding the phenomenon of local over-brightness or under-brightness, and improving the consistency of screen brightness. Therefore, the light-emitting substrate 200 provided in this 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 is increased due to multiple refractions and scatterings in the light mixing shell 3, thus avoiding the overall blue tint caused by the short optical path of the blue light.

[0075] The base plate 10 can be a metal back plate. The material of the base plate 10 can be aluminum, electro-galvanized steel sheet (SECC), hot-dip galvanized steel sheet (SGCC), etc. In other embodiments, the material of the base plate 10 can also be other materials that can serve a load-bearing function.

[0076] In some embodiments, reference Figure 9 The light-mixing shell 3 includes a first surface M1, which is the surface of the light-mixing shell 3 away from the light-emitting unit 20. The first surface M1 is a curved surface that bulges away from the light-emitting unit 20. The first surface M1 is set as a curved surface that bulges 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, avoid the light being concentrated in a certain area, and make the light more evenly cover the entire light-mixing area, reducing the phenomenon of local over-brightness or under-brightness.

[0077] The first surface M1, being a curved surface convex away from the light-emitting unit 20, can better reflect and refract light, thus reducing light loss during propagation. The curved surface design allows the mixing shell 3 to better alter the refraction and reflection paths of light emitted from the light-emitting unit 20, enabling a more uniform distribution of light within the mixing cavity, thereby enhancing the mixing effect. By scattering, the range of light coverage is expanded, resulting in a more uniform light distribution, reduced light loss, optimized light emission angle, improved front brightness and light energy utilization, and promotion of uniform mixing of red, green, and blue light, reducing color difference and color shift. Compared to planar structures, curved surfaces can better break the straight-line propagation path of light, reducing the phenomenon of excessively high or low local light intensity.

[0078] Continue to refer to Figure 9 , Figure 10 or Figure 11 The light-mixing shell 3 includes a top shell 31 and a side shell 32. The top shell 31 includes a first surface M1 and 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 the second surface M2 of the side shell 32 and the top shell 31 form a receiving groove C around the central axis Z of the top shell 31; the other end of the side shell 32 is connected to the bottom plate 10.

[0080] refer to Figure 9 , Figure 10 or Figure 11 The "central axis Z of the top shell 31" mentioned above refers to a straight line that runs through the geometric center of the top shell 31.

[0081] The top shell 31 and side shells 32 of the light mixing shell 3 can be integrally molded. Because there are no seams, the light mixing shell 3 has high structural strength and good sealing performance, 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 production efficiency and reduces the assembly time of the light mixing shell 3.

[0082] The top shell 31 and side shell 32 of the hybrid shell 3 can also be separate components, meaning that the top shell 31 and side shell 32 adopt a separate structure and are combined into a whole component through subsequent connection processes. In this way, the top shell 31 and side shell 32 can use 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 material with heat dissipation properties.

[0083] In some embodiments, references may be used. Figure 8 and Figure 12 Along the direction parallel to the plane of the base plate 10, the cross-sectional shape of the receiving groove C is square. (Refer to reference...) Figure 8 and Figure 13 Along the direction parallel to the plane of the base plate 10, the cross-sectional shape of the receiving groove C is circular. In other embodiments, along the direction parallel to the plane of the base plate 10, the cross-sectional shape of the receiving groove C may also include a rectangular ellipse or a regular hexagon.

[0084] Continue to refer to Figure 9 , Figure 10 or Figure 11 Along the central axis Z of the top shell 31 to its edge, the thickness of the top shell 31 gradually decreases. This optimizes the refraction and scattering of light, making the light distribution more uniform during the light mixing process and avoiding localized overly bright or dark areas. It also helps to achieve a smooth transition of light, allowing light from different areas of the light mixing shell 3 to blend better and improve the overall light mixing effect.

[0085] Continue to refer to Figure 9 , Figure 10 or Figure 11 The side shells 32 have uniform thickness, which refers to the dimension of the side shells 32 along the plane parallel to the base plate 10. This uniform thickness ensures that the side shells 32 are evenly distributed under stress, improving the overall structural stability and resistance to deformation. Secondly, the uniform thickness also helps in the even conduction and dissipation of heat, avoiding localized overheating and improving the heat dissipation performance of the light-mixing shell. In some embodiments, the haze of the light-mixing shell 3 ranges from 40% to 60%. For example, the haze range of the light-mixing shell 3 is 40%, 45%, 50%, 55%, or 60%. Within this range, the haze of the light-mixing shell 3 effectively scatters light, preventing localized overbrightness and promoting more uniform light distribution.

[0086] For example, refer to Figure 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, and the first part AA is connected to one of the second parts BB. The haze of the first part AA is greater than that 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 better scatter light. When light is emitted from the light-emitting unit 20 and passes through the first part AA of the light-mixing shell 3, the high haze of the first part AA makes the light more evenly distributed in all directions, thereby helping to avoid the generation of obvious light spots in the light-mixing shell 3. Here, haze refers to the ratio of the scattered light flux that deviates from the parallel light direction when parallel light enters a transparent object to the total transmitted light flux.

[0087] For example, refer to Figure 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 surrounding the first part AA, and the haze of the first part AA being about 10% higher than that of the second part BB. For example, the haze of the first part AA is 9%, 10%, or 11% higher than that of the second part BB.

[0088] For example, refer to Figure 15 The top shell 31 of the light-mixing shell 3 includes a first part AA and multiple second parts BB. The multiple second parts BB are arranged and connected sequentially along a first direction X, which is the radial direction of the first part AA and the direction away from the first part AA. Along the first direction X, the haze of the multiple second parts BB gradually decreases. This design of gradually decreasing haze can effectively control the scattering and transmission of light, making the light distribution more uniform and improving the overall light efficiency of the light-mixing shell 3.

[0089] In some embodiments, a light diffusing agent is distributed in at least the top shell 31 of the light-mixing shell 3. For example, a light diffusing agent is distributed in the top shell 31. Alternatively, a light diffusing agent is distributed in both the top shell 31 and the side shells 32. The light diffusing agent can scatter light, making the light evenly distributed inside the top shell 31 and the side shells 32, avoiding local overly bright or dark phenomena, and improving the uniformity of the display effect.

[0090] In some embodiments, the light diffusing agent forms multiple island structures in the light mixing shell 3, and the multiple island structures are evenly distributed. Since the island structures formed by the light diffusing agent can effectively scatter light, the light is evenly distributed in the light mixing shell 3, avoiding concentrated or locally excessively bright light in the light mixing shell.

[0091] The phrase "the light diffusing agent forms multiple island structures" refers to the light diffusing agent being 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 diffusing agent in the first portion AA of the top shell 31 is smaller than that in the second portion BB of the top shell 31. This results in a higher haze in the first portion AA of the top shell 31 compared to the second portion BB. Therefore, by distributing light diffusing agents of different particle sizes, the light propagation path of the entire top shell 31 can be optimized, making the brightness and color of the light-emitting substrate 200 more uniform, avoiding the problem of light spots or uneven brightness on the surface of the light-mixing shell 3, and improving the overall display effect.

[0093] For example, the light diffusing agent in the first part AA of the top shell 31 has a particle size of 2μm to 3μm, such as 2μm, 2.5μm, 2.8μm or 3μm.

[0094] For example, the light diffusing agent in the second part BB of the top shell 31 has a particle size of 3μm to 5μm, such as 3μm, 3.5μm, 3.8μm, 4.5μm or 5μm.

[0095] When the top shell 31 comprises multiple second parts BB, the particle size of the light diffusing agent in the multiple second parts BB gradually increases along the first direction X. This gradual increase in particle size optimizes the light scattering effect, making the light distribution within the mixing shell 3 more uniform and avoiding localized over-brightness or under-brightness. Secondly, the gradient design of the light diffusing agent particle size also helps to achieve a smooth transition of light, allowing light from different regions of the mixing shell 3 to blend better, thereby improving the light mixing effect of the mixing shell 3. It can also reduce light loss during propagation, improve light efficiency, and ensure that more light is effectively utilized.

[0096] Specifically, the light-mixing shell 3 includes a substrate layer, to which quantum dots and inorganic light diffusing agents are added, or quantum dots and organic light diffusing agents are added. The substrate layer is made of 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 and polypropylene.

[0098] The statement that "the haze of the first part AA is greater than the haze of the second part BB" means that the concentration of the light diffusing agent in the first part AA is higher than that in the second part BB. Since the different concentrations of diffusing agent added to the light mixing shell 3 will affect the uniformity of the light mixing shell 3, the haze effect of the light mixing shell 3 can be adjusted by varying the concentration of diffusing agent in it. The haze of the first part AA and the haze of the second part BB can be adjusted according to the actual light mixing effect and are not limited thereto.

[0099] For example, the haze of the first part AA is 50%~70%, and the haze of the second part BB is 40%~60%. For instance, when the haze of the first part AA is 50%, the haze of the second part BB can be 40%; or, when the haze of the first part AA is 55%, the haze of the second part BB can be 45%; or, when the haze of the first part AA is 60%, the haze of the second part BB can be 50%; or, when the haze of the first part AA is 70%, the haze of the second part BB can be 60%. The haze of the first part AA and the haze of the second part BB can also be other parameters, and the specific design can be tailored to actual needs without limitation.

[0100] For example, the haze in a circular area 5mm 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 the light distribution and light mixing effect. The higher the haze of the first part AA, the stronger the scattering, which makes the light in the first part AA more dispersed, thus avoiding the light from being emitted from the light mixing shell 3 as a spot with a high central brightness.

[0101] In some embodiments, reference Figure 17 The radius of curvature R1 of the surface of the light-mixing shell 3 ranges from 355.56 mm to 471.75 mm. The radius of curvature R1 describes the degree of curvature of the surface at a given point. For example, the radius of curvature R1 of the surface of the light-mixing shell 3 can be 355.56 mm, 360 mm, 370 mm, 380 mm, 400 mm, 450 mm, 460 mm, or 471.75 mm. This range of radius of curvature R1 of the surface of the light-mixing shell 3 is beneficial for controlling the scattering angle of the light from the light-emitting unit 20. This allows for the mixing of light from different directions, resulting in a smooth transition between the central area AA and the edge area BB, avoiding obvious bright-dark boundaries on the light-mixing shell 3. It effectively guides light to diffuse evenly from the light-emitting unit 20, preventing light from concentrating at a single point or area of ​​the light-mixing shell 3, thus achieving a more uniform light mixing effect.

[0102] Where the radius of curvature R1 of the surface of the light-mixing shell 3 is in 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 radius of curvature R1 of the 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 Figure 14 , Figure 15 or Figure 16 The side shell 32 includes a first end face D1 for connection with the base plate 10; along the circumference of the receiving groove C, the first end face D1 of the side shell 32 is provided with a plurality of spaced protrusions T, and the sidewalls of adjacent protrusions T opposite each other 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 base plate 10 through the protrusions M.

[0104] The heat dissipation channel M can quickly dissipate the heat generated by the light-emitting unit 20 during operation, preventing heat from accumulating inside the light-mixing shell 3 for extended periods. This effectively reduces the temperature of both the light-emitting unit 20 and the light-mixing shell 3, ensuring stable optical performance and extending the lifespan of the light-emitting unit 20. Furthermore, since excessively high temperatures can cause changes in the optical properties of the material in the light-mixing shell 3 (such as increased haze or decreased light transmittance), this channel helps prevent aging or deformation of the material due to prolonged high temperatures, thus maintaining the optical performance of the light-mixing shell 3 and extending its lifespan.

[0105] For example, the height of the protruding structure T can be 0.8mm to 1.2mm, which means the height of the heat dissipation channel M is 0.8mm to 1.2mm. For instance, the height of the protruding structure T is 1mm, which ensures heat dissipation while also facilitating light mixing between the light-emitting units 20 within the light-mixing shell 3.

[0106] Continue to refer to Figure 9 , Figure 10 or Figure 11 The distance from the bottom surface of the receiving groove C to the light-emitting unit 20 is H. This provides sufficient space for the light emitted by the light-emitting unit 20 to be scattered, allowing the light to blend better and cover the entire light mixing area more evenly, 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 Figure 18A light-mixing shell 3 encloses multiple light-emitting units 20, which are arranged in a matrix. The light-mixing shell 3 is also arranged in a matrix. For example, a light-mixing shell 3 may enclose two light-emitting units 20; or, a light-mixing shell 3 may enclose three light-emitting units 20; or, a light-mixing shell 3 may enclose four light-emitting units 20; or, a light-mixing shell 3 may enclose six light-emitting units 20. The number of light-emitting units 20 enclosed in a light-mixing shell 3 can be designed according to design requirements and is not specifically limited.

[0108] In this way, the light emitted by multiple light-emitting units 20 can be superimposed and mixed within the light-mixing shell 3. Due to the large number and uniform distribution of the light-emitting units 20, the light emitted by them can be mixed more thoroughly within the light-mixing shell 3, achieving a more uniform light distribution. This can effectively reduce the light spots that may be caused by the light emitted by a single light-emitting unit 20. Furthermore, the matrix arrangement of the light-emitting units 20 can cover a larger area, making the light distribution more uniform and avoiding localized overly bright or dark areas.

[0109] The change in luminous intensity of the near-field light source of the light-emitting unit 20 with the emission angle is as follows: Figure 19 As shown, specifically, the luminous intensity of the near-field light field of the light-emitting unit 20 decreases as the emission angle increases. Under the constraint of the emission angle, the distance between the light-emitting units 20 is such that when the emission angle of the light-emitting unit 20 is between 65° and 85°, it is beneficial for multiple light-emitting units 20 within the light-mixing shell 3 to mix light with each other. For example, the emission angles of the light-emitting units 20 can be 65°, 66°, 68°, 70°, 75°, 78°, 80°, 82°, 83°, or 85°.

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

[0111] For example, see references Figure 9 and Figure 20 The distance between adjacent light-emitting units 20 within the receiving groove C is P, and the distance from the bottom surface of the receiving groove C to the light-emitting unit 20 is H, where P = k. The values ​​of H and k range from 4.28 to 7.47.

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

[0113] The calculation process for the distance between adjacent light-emitting units 20 within the receiving slot C is as follows: That is , When multiple light-emitting units 20 are mixed, the emission angle at which the light mixing effect is best, and The value range is 65°~85°. Substituting the range of values, we can obtain that the value of k is 4.28~7.47.

[0114] For example, refer to Figure 21 The minimum distance between adjacent light-emitting units 20 within the receiving slot C Where H is the distance from the bottom surface of the receiving groove C to the light-emitting unit 20, which is the height of the receiving groove C; This is the minimum emission angle for optimal light mixing effect of the light-emitting unit 20. The value ranges from 65° to 68°. For example, The value can be 65°, 66°, 67° or 68°. This ensures that the light from the light-emitting unit 20 located in a receiving slot C fully overlaps on the surface of the base plate 10, maximizing the coverage area of ​​the light on the base plate 10, avoiding dark areas caused by excessive spacing between the light-emitting units 20 or bright spots caused by excessive spacing, and avoiding the waste of light caused by reducing redundant design between the light-emitting units 20.

[0115] For example, refer to Figure 21 The maximum distance between adjacent light-emitting units 20 within the receiving slot C ; This represents the maximum emission angle when the light-emitting unit 20 achieves good light mixing. The value ranges from 83° to 85°. For example, The value can be 82°, 83°, 84° or 85°. This ensures that the light from the light-emitting unit 20 located in a receiving slot C fully overlaps on the surface of the base plate 10, maximizing the coverage area of ​​the light on the base plate 10, avoiding dark areas caused by excessive spacing between the light-emitting units 20 or bright spots caused by excessive spacing, and avoiding the waste of light caused by reducing redundant design between the light-emitting units 20.

[0116] In some embodiments, a light-mixing shell 3 covers a plurality of light-emitting units 20, which 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 portion AA of the top shell 31 onto the base plate 10 coincides with the first reference point. Here, the first reference point refers to the center of the geometric shape enclosed by the plurality of light-emitting units 20. Because the centrally symmetrical arrangement allows light to diffuse evenly from the center to the surrounding area, it can better balance the light intensity of the entire display area.

[0117] For example, refer to Figure 22A light-mixing shell 3 houses four light-emitting units 20, arranged in a two-row, two-column matrix; the four light-emitting units 20 are symmetrical about a first reference point O. The base of the light-mixing shell 3 has a diameter R of 150mm, and the height of the light-mixing shell 3 is 5mm to 6mm, for example, 5mm. The receiving groove C is a square groove with a side length L of 100mm and a height H of 2mm. The value is set to 65°. The value is set to 85°. In this case, the minimum distance P between any two adjacent light-emitting units 20 of the four light-emitting units 20 is... min =8.57mm; Maximum distance P max =45.7mm. That is, the distance P between any two adjacent light-emitting units 20 in the four light-emitting units 20 is between 8.57mm and 45.7mm, for example, 9mm, 10mm, 20mm, 30mm, 40mm, or 44mm. At this distance, the light mixing effect of the four light-emitting units 20 in the light mixing shell 3 is the best.

[0118] For example, refer to Figure 23 A light-mixing shell 3 covers three light-emitting units 20, which 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 portion AA of the light-mixing shell 3 is m, where m = Pb The values ​​of H and b range from 4.288 to 22.86. This not only makes the structure of the light-mixing shell 3 more compact, but also reduces light loss during propagation, improves light efficiency, and ensures that more light is effectively utilized.

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

[0121] refer to Figure 24 The calculation process for the diameter m of the first part AA of the mixed-light shell 3 can be: m = P - 2 Therefore, b=2 ,because The value range is 65°~85°, so the value of b is 4.288~22.86.

[0122] For example, continue to refer to Figure 24 A light-mixing shell 3 houses four light-emitting units 20, arranged in a two-row, two-column matrix. The distance between adjacent light-emitting units 20 within 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. Therefore, the diameter m of the first part AA of the light-mixing shell 3 is m = P - 2. In this case, the ratio of the diameter m of the first part AA to the range of the curvature diameter of the surface of the light-mixing shell 3 is [(P-2 ) / 2 R]%.

[0123] Since the radius of curvature R1 of the surface of the light-mixing shell 3 is in the range of 355.56mm to 471.75mm, and the emission angle is... The angle is between 65° and 85°, which is beneficial for light mixing within the light mixing shell 3. The distance from the bottom surface of the receiving groove C to the light-emitting unit 20 is 2mm. 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 Figure 9 , Figure 10 or Figure 11 At least one quantum dot is distributed on the surface or inside the light-mixing shell 3. Each quantum dot emits light of a preset color when excited by 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. By distributing quantum dots 33 on the surface or inside the light-mixing shell 3, the light emitted by the light-emitting unit 20 interacts 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, enhancing the light mixing effect while covering a wider color gamut. Thus, multiple light-emitting units 20 can form a surface light source after passing through the light-mixing shell 3. The distribution of quantum dots 33 on the surface or inside the light-mixing shell 3 means that the quantum dots 33 cover the light-radiating surface of the light-emitting unit 20.

[0125] The quantum dots 33 include red and green quantum dots. Thus, when the blue light emitted by the light-emitting unit 20 passes through the quantum dot layer, some of the blue light is converted into red light by the red quantum dots, and some is converted into green light by the green quantum dots. These converted lights, along with the unconverted blue light, form white light. When light emitted from adjacent mixing shells 3 mixes with each other, due to the tunability and high brightness of the quantum dot 33, these lights can be mixed more uniformly 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 quantum dots 33 on the surface or inside 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 realized, which enhances the light 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 light mixing shell 3.

[0127] For example, refer to Figure 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 can be a film layer 330 formed of quantum dots 33. Or, an additional film layer 330 including quantum dots 33 can be provided on the first surface M1 of the light-mixing shell 3, so that the light emitted from 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] For example, refer to Figure 10 Quantum dots 33 are distributed inside the light mixing shell 3. In this way, the light emitted from 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, which makes the mixing of green, red and blue light more complete and the image quality better.

[0129] For example, refer to Figure 11 The receiving tank C has at least a film layer 330 containing quantum dots 33 on its bottom surface. 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 containing quantum dots 33 to form a white light surface light source.

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

[0131] In this case, the bottom surface of the receiving groove C of the light mixing shell 3 may be a film layer 330 including quantum dots 33. Alternatively, a film layer 330 including quantum dots 33 may be additionally provided on the bottom surface of the receiving groove C of the light mixing shell 3.

[0132] In some embodiments, the red and green quantum dots in the first portion AA of the top shell 31 of the light-mixing shell 3 are uniformly distributed, and the red and green quantum dots in the second portion BB of the top shell 31 of the light-mixing shell 3 are also uniformly distributed, with the density of the red and green quantum dots in the second portion BB being equal to the density of the red and green quantum dots in the first portion AA. This uniform distribution and density of red and green quantum dots in both the first portion AA and the second portion BB ensures uniform light emission throughout the top shell 31, avoiding uneven brightness or color difference. Furthermore, the uniform distribution of quantum dots helps maintain color consistency, ensuring consistent colors in both the first portion AA and the second portion BB, thus improving visual effects. In addition, it simplifies the manufacturing process, reduces production difficulty and cost, and improves product consistency and yield. It also helps improve the stability of the light-emitting unit 20, reducing hot spots and localized aging caused by uneven distribution of red and green quantum dots, and extending the lifespan of the light-emitting unit 20.

[0133] In some embodiments, the red and green quantum dots in the first portion AA of the top shell 31 of the light-mixing shell 3 are uniformly distributed, and the red and green quantum dots in the second portion BB of the top shell 31 of the light-mixing shell 3 are also uniformly distributed, with a higher density of red and green quantum dots in the second portion BB than in the first portion AA. Since the luminous efficacy of the second portion BB is typically lower than that of the first portion AA, the first portion AA is generally brighter than the second portion BB. By increasing the density of red and green quantum dots in the second portion BB, the brightness difference between the first portion AA and the second portion BB can be balanced, achieving a more uniform display brightness.

[0134] Continue to refer to Figure 9 , Figure 10 or Figure 11 The light-emitting substrate 200 also includes a reflective sheet 40, which is stacked on the base plate 10. Multiple light-mixing shells 3 and multiple light-emitting units 20 are fixed to the side of the reflective sheet 40 away from the base plate 10. When the multiple light-emitting units 20 emit light, the light propagates in all directions, thus potentially shining onto the base plate 10. Adding the reflective sheet 40 to the base plate 10 can reflect the light shining onto the base plate 10, thereby improving the light utilization rate.

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

[0136] Embodiments of this disclosure also provide a backlight module 100. (See reference...) Figure 25The backlight module 100 includes: a light-emitting substrate 200 as described in any of the above embodiments, and a diffuser plate 50 disposed on the light-emitting side of the light-emitting substrate 200. The diffuser plate 50 can disperse the concentrated light in various directions, thereby improving the uniformity of brightness in the display area of ​​the backlight module 100.

[0137] The backlight module 100 provided in the above embodiment can form a high color gamut surface light source by passing multiple light-emitting units 20 through the light mixing shell 3 in the light-emitting substrate 200. After passing through the diffuser plate 50 for secondary light mixing, the uniformity of the overall picture is further improved and the brightness of the backlight module 100 is increased. This reduces the distance between the diffuser plate 50 and the bottom plate 10 in the light-emitting substrate 200, that is, reduces the light mixing distance D, thereby reducing the thickness of the backlight module 100. While achieving a wide color gamut, it also improves the picture quality of the backlight module 100.

[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 base plate 10. A plurality of light-emitting units 20 and a plurality of light-mixing shells 3 are fixed to the side of the reflective sheet 40 away from the base plate 10. The distance between the diffuser plate 50 and the reflective sheet 40 is inversely proportional to the haze of the light-mixing shell 3. To achieve a thinner and lighter design for the backlight module 100, a high-haze light-mixing shell 3 is selected to reduce the distance between the diffuser plate 50 and the reflective sheet 40.

[0139] In some embodiments, the haze of the diffuser plate 50 is 55% to 65%, for example, 55%, 60%, or 65%. In this way, the diffuser plate 50 can disperse the light from the multiple light-emitting units 20 in different directions, which is beneficial to the uniform distribution of light.

[0140] The diffuser plate 50 includes a substrate layer and a diffusing agent located in the substrate layer. The diffusing agent is uniformly distributed in the substrate layer in the form of tiny particles. When light enters the diffuser plate, it can be dispersed in different directions by the tiny diffusing particles inside the diffuser plate, changing the original straight-line propagation to multi-directional propagation, which is beneficial to the uniform distribution of light.

[0141] The substrate layer is made of at least one of polystyrene (PS), polycarbonate (PC), polypropylene (PP), and polymethyl methacrylate (PMMA). For example, the substrate layer may be made of polystyrene, polycarbonate, polypropylene, or polymethyl methacrylate. Alternatively, the substrate layer may be made of polystyrene and polycarbonate. Alternatively, the substrate layer may be made of polystyrene and polypropylene. Alternatively, the substrate layer may be made of polystyrene and polymethyl methacrylate. Alternatively, the substrate layer may be made of polystyrene, polycarbonate, and polypropylene. Alternatively, the substrate layer may be made of polystyrene, polycarbonate, and polymethyl methacrylate. Alternatively, the substrate layer may be made of polycarbonate, polypropylene, and polymethyl methacrylate. Alternatively, the substrate layer may be made of polystyrene, polycarbonate, polypropylene, and polymethyl methacrylate.

[0142] Diffusing agents can be inorganic or organic. Inorganic diffusing agents include silica (SiO2) and calcium carbonate (CaCO3), while organic diffusing agents include acrylic microspheres and polystyrene microspheres.

[0143] In some embodiments, continue to refer to Figure 25 The backlight module 100 further includes an optical film layer 70, which is disposed on the side of the diffuser plate 50 away from the light-emitting substrate 200. The optical film layer 70 includes, along the direction away from the light-emitting substrate 200, a prism sheet, a reflective polarizing brightening film and a composite film stacked in sequence.

[0144] Among them, the prism sheet can concentrate the scattered light into a direction perpendicular to the light-emitting substrate 200, which helps to reduce lateral light loss and improve the front brightness of the backlight module 100.

[0145] The Dual Brightness Enhancement Film (DBEF) allows light with the same polarization direction as the display panel to pass through, while reflecting non-polarized light back to the backlight module 100. After multiple reflections, the light is reused, thereby further improving the brightness of the backlight module 100.

[0146] Composite films can adjust the light propagation path and optimize light distribution as needed.

[0147] In this way, the optical film layer 70, through the synergistic work of the prism sheet, the reflective polarizing brightening film and the composite film, helps to reduce unnecessary light leakage and interference, improve the shielding of the backlight module 100, and enable 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 thickness of the diffuser plate 50 is 1.0T to 1.3T, for example 1.0T, 1.2T or 1.3T.

[0149] For example, when the thickness of the diffuser plate 50 is 1.2T, the minimum light mixing distance D can be 10mm. And when the light mixing shells 3 are uniformly arranged, the optical simulation diagram of the backlight module 100 in this embodiment, that is, the backlight module 100 including the light mixing shells 3, is as follows: Figure 26 As shown, the optical simulation diagram of the backlight module 100 excluding the light mixing shell 3 is as follows: Figure 27 As shown in the figure. By comparison, it can be seen that the backlight module 100, including the light mixing shell 3, can achieve an optical uniformity of 90% while reducing the light mixing distance D, thus meeting the requirements for image uniformity and achieving a good light mixing effect.

[0150] Embodiments of this disclosure also provide a display device 1000, see reference. Figure 28 The system includes: the backlight module 100, the display panel OC, and the mid-frame 80 as described in the above embodiments. The display panel OC is disposed on the light-emitting side of the backlight module 100. The mid-frame 80 has a receiving portion, and the display panel OC is disposed within the receiving portion.

[0151] The specific structure of the backlight module 100 can be referred to the description of the backlight module 100 in the above embodiments, and will not be repeated 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 disposed opposite to each other, the liquid crystal layer is filled between the color filter substrate and the array substrate, the first polarizer is disposed on the side of the array substrate away from the color filter substrate, and the second polarizer is disposed on the side of the color filter substrate away from the array substrate.

[0153] Continue to refer to Figure 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 of light.

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

[0155] Because the light-mixing shell 3 in the light-emitting substrate 200 is provided with quantum dots 33, and the emission spectrum of the quantum dots 33 is very narrow, the monochromatic spectrum obtained after the white light formed by light mixing is filtered by the color filter substrate of the display panel OC is also very narrow. This results in high purity of the monochromatic image of the display device 1000. Compared to using a quantum dot film 60, the display device 1000 provided in this embodiment avoids the phenomenon of red and green light scattering in different directions, which causes the image edges to appear bluish, or the non-uniform color spot with a white center and yellow edges to be displayed on the light-emitting surface of a single area. The display device 1000 provided in this embodiment can achieve a wide color gamut while also improving image quality.

[0156] In some embodiments, the display device 1000 further includes a front frame connected to a middle frame 80. A portion of the front frame is located on the side of the display panel OC furthest from the backlight module 100, and a portion is located on the side of the display panel OC closest to the backlight module 100. This connection between the front frame and the middle frame 80 allows for multi-directional fixation of the display panel OC, reducing the risk of displacement of the display panel OC due to external impacts or vibrations.

[0157] In some embodiments, the front frame is disposed 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 subjected to a side impact, 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 breakage or delamination.

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

[0159] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A light-emitting substrate, characterized by, The application relates to a light-emitting device, comprising: a bottom plate; a plurality of light-emitting units arranged on one side of the bottom plate; a plurality of light mixing shells, each of which covers at least one light-emitting unit on the light-emitting side of the light-emitting unit; the light mixing shell has a receiving groove, and the groove opening of the receiving groove faces the bottom plate, and at least one light-emitting unit is arranged in the receiving groove.

2. The light emitting substrate of claim 1, wherein, The light mixing shell comprises a first surface, which is the surface of the light mixing shell away from the light-emitting unit, and the first surface is a curved surface protruding away from the light-emitting unit.

3. The light-emitting substrate according to claim 2, characterized in that, The light mixing shell comprises a top shell and a side shell, the top shell comprises the first surface, and the top shell further comprises 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 enclose the receiving groove; the other end of the side shell is connected to the bottom plate.

4. The light emitting substrate of claim 3, wherein, The side shell comprises a first end face for connecting to the bottom plate; a plurality of spaced protruding structures are arranged on the first end face of the side shell along the circumferential direction of the receiving groove, and the side walls opposite to the adjacent protruding structures form heat dissipation channels with the first end face; the first end face of the side shell is connected to the bottom plate through the protruding structures.

5. The light emitting substrate of claim 3, wherein, The top shell comprises 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 that of the second part; when the top shell comprises a plurality of second parts, the plurality of second parts are arranged in sequence along a first direction and are sequentially connected, the first direction is the radial direction of the first part and the direction away from the first part, and the haze of the plurality of second parts gradually decreases along the first direction.

6. The light emitting substrate of claim 5, wherein, The light diffusing agent is distributed in at least the top shell of the light mixing shell; the light diffusing agent forms a plurality of island structures in the light mixing shell, and the plurality of island structures are uniformly distributed; and / or the particle size of the light diffusing agent located in the first part of the top shell is smaller than that of the light diffusing agent located in the second part of the top shell.

7. The light emitting substrate of claim 5, wherein, One light mixing shell covers a plurality of light-emitting units, and the plurality of light-emitting units are arranged in a matrix; the plurality of light-emitting units are centrosymmetric about a first reference point, and the projection of the center of the first part of the top shell on the bottom plate coincides with the first reference point.

8. The light emitting substrate of claim 7, wherein, The distance between adjacent light-emitting units in the receiving groove is P, the distance from the groove 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 of claim 8, wherein, The diameter of the first part is m, m=P-b*H, and the value range of b is 4.288-22.

86.

10. The light emitting substrate according to any one of claims 1-9, wherein, The surface or inner part of the light mixing shell is distributed with at least one quantum dot, each quantum dot is used for emitting 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 of claim 10, wherein, The light mixing shell comprises a first surface, which 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 accommodating groove is provided with a film layer comprising the quantum dots.

12. The light emitting substrate of claim 10, wherein, The light emitting unit is a blue light emitting unit, and the quantum dots comprise red quantum dots and green quantum dots.

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

14. The backlight module of claim 13, wherein, The light emitting substrate further comprises a reflective sheet, which is laminated on the bottom plate, and the plurality of light emitting units and the plurality of light mixing shells are fixed to one side of the reflective sheet away from the bottom plate; The distance between the diffusion plate and the reflective sheet is inversely proportional to the haze of the light mixing shell.

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

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