Quantum dot diffusion plate, backlight module and display device

Abstract

The utility model provides a quantum dot diffusion plate, a backlight module and a display device. The quantum dot diffusion plate comprises a refraction layer and a quantum dot diffusion layer which are arranged in a stacked mode. The refraction layer of the quantum dot diffusion plate comprises a first refraction layer and a second refraction layer which are arranged in a stacked mode. The first refraction layer comprises a plurality of strip-shaped first refraction bodies, and the multiple first refraction bodies are sequentially arranged in the width direction of the quantum dot diffusion plate; the second refraction layer comprises a plurality of strip-shaped second refraction bodies, the second refraction bodies are sequentially arranged in the length direction of the quantum dot diffusion plate, and the length direction of the first refraction bodies intersects with the length direction of the second refraction bodies. According to the quantum dot diffusion plate, the first refraction layer and the second refraction layer of the structure are arranged, so that the display frame of the display device can keep high color uniformity, and a good display effect is achieved.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and in particular relates to a quantum dot diffusion plate, a backlight module and a display device. Background Art

[0002] In a quantum dot display device, if a technical solution of using an LED light source in combination with a quantum dot diffusion plate is used, when the display device turns on the zone light control function, the light emitted by the light source is not evenly diffused to excite the quantum dot material, which will cause the color uniformity of the display screen of the display device to deteriorate. Specifically, the color temperature of the screen in the area close to the LED light source is colder, and the color temperature of the screen in the area far from the LED light source is warmer. Utility Model Content

[0003] The embodiments of the present application provide a quantum dot diffusion plate, a backlight module and a display device to solve the problem of uneven display color of the existing display device.

[0004] In a first aspect, an embodiment of the present application provides a quantum dot diffuser plate, comprising a refractive layer and a quantum dot diffuser layer which are stacked, wherein the refractive layer comprises a first refractive layer and a second refractive layer which are stacked; the first refractive layer comprises a plurality of first refractive bodies in the form of strips, and the plurality of first refractive bodies are arranged in sequence along the width direction of the quantum dot diffuser plate; the second refractive layer comprises a plurality of second refractive bodies in the form of strips, and the plurality of second refractive bodies are arranged in sequence along the length direction of the quantum dot diffuser plate, and the length direction of the first refractive body intersects with the length direction of the second refractive body.

[0005] Optionally, the angle between the length direction of the first refractor and the length direction of the quantum dot diffuser is α, 0°≤α≤45°; and / or the angle between the length direction of the second refractor and the width direction of the quantum dot diffuser is β, 0°≤β≤45°.

[0006] Optionally, the first refractive body is shaped like a triangular prism, a semi-cylinder or a semi-ellipsoid, or the first refractive body includes a plurality of first refractive parts arranged in sequence along the length direction of the first refractive body, and the shape of the first refractive part is a hemisphere or a semi-ellipsoid; and / or the maximum thickness of the first refractive body is 50μm to 150μm.

[0007] Optionally, the second refractive body is in the shape of a triangular prism, a semi-cylinder or a semi-ellipsoidal cylinder, or the second refractive body includes a plurality of second refractive parts arranged in sequence along the length direction of the second refractive body, and the shape of the second refractive part is a hemisphere or a semi-ellipsoid; and / or the maximum thickness of the second refractive body is 50 μm to 150 μm.

[0008] Optionally, the first refractive layer further includes a first substrate, and the plurality of first refractive bodies are arranged on a side of the first substrate away from the quantum dot diffusion layer; and / or the second refractive layer further includes a second substrate, and the plurality of second refractive bodies are arranged on a side of the second substrate away from the first refractive layer.

[0009] Optionally, the number of the first refractive layer and the number of the second refractive layer are both one, and the first refractive layer, the second refractive layer and the quantum dot diffusion layer are stacked in sequence, or the second refractive layer, the first refractive layer and the quantum dot diffusion layer are stacked in sequence;

[0010] Alternatively, the number of one of the first refractive layers and the second refractive layers is N, the number of the other is N+1, N≥1, and the first refractive layers and the second refractive layers are alternately arranged; or, the number of the first refractive layers and the second refractive layers are both M, M≥2, and the first refractive layers and the second refractive layers are alternately arranged.

[0011] Optionally, the quantum dot diffusion plate further includes a foaming diffusion layer, and the refractive layer, the quantum dot diffusion layer and the foaming diffusion layer are stacked in sequence.

[0012] Optionally, the foaming diffusion layer has bubbles, and the average diameter of the bubbles is 100 μm to 800 μm; and / or the density of the foaming diffusion layer is 0.7 g / cm 3 ~0.9g / cm 3 .

[0013] In a second aspect, an embodiment of the present application further provides a backlight module, which includes a light source and the above-mentioned quantum dot diffusion plate, wherein the light source is arranged on a side of the refractive layer away from the quantum dot diffusion layer.

[0014] In a third aspect, an embodiment of the present application further provides a display device, which includes the above-mentioned backlight module.

[0015] The quantum dot diffusion plate, backlight module and display device provided by the embodiments of the present application are achieved by stacking a first refraction layer and a second refraction layer of the refraction layer, and arranging a plurality of strip-shaped first refraction bodies of the first refraction layer in sequence along the length direction of the quantum dot diffusion plate, and arranging a plurality of strip-shaped second refraction bodies of the second refraction layer in sequence along the width direction of the quantum dot diffusion plate, and the length direction of the first refraction body intersects with the length direction of the second refraction body, so that the light emitted by the light source can be refracted through the two refraction layers with different structures, so that the light emission angle is effectively expanded and then the quantum dot material in the quantum dot diffusion layer is excited to form a surface light source with high color uniformity, thereby enabling the display device to maintain high color uniformity when the zone light control function is turned on, thereby achieving a good display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without creative work. In the following description, the same figure numbers represent the same parts.

[0017] Figure 1 A schematic diagram of the structure of the backlight module provided in an embodiment of the present application.

[0018] Figure 2 for Figure 1 The left side view of the backlight module is shown.

[0019] Figure 3 A schematic diagram of the first structure of the quantum dot diffusion plate provided in an embodiment of the present application.

[0020] Figure 4 for Figure 3 Left side view of the quantum dot diffuser plate shown.

[0021] Figure 5 for Figure 3 The schematic structural diagram of the first refractive layer in the quantum dot diffuser plate is shown, wherein the angle between the length direction of the first refractive body and the length direction of the quantum dot diffuser plate is 0°.

[0022] Figure 6 for Figure 5 Another structural schematic diagram of the first refractive layer is shown, wherein the angle between the length direction of the first refractive body and the length direction of the quantum dot diffusion plate is not 0°.

[0023] Figure 7 for Figure 3 The schematic structural diagram of the second refractive layer in the quantum dot diffuser plate is shown, wherein the angle between the length direction of the second refractive body and the width direction of the quantum dot diffuser plate is 0°.

[0024] Figure 8 for Figure 7 Another structural schematic diagram of the second refractive layer is shown, wherein the angle between the length direction of the second refractive body and the width direction of the quantum dot diffusion plate is not 0°.

[0025] Fig. 9 A second structural schematic diagram of the quantum dot diffusion plate provided in an embodiment of the present application.

[0026] Fig.10 for Fig. 9 Left side view of the quantum dot diffuser plate shown.

[0027] Fig.11 for Fig. 9 The schematic structural diagram of the first refractive layer in the quantum dot diffuser plate is shown, wherein the angle between the length direction of the first refractive body and the length direction of the quantum dot diffuser plate is 0°.

[0028] Fig.12 for Fig. 9 The schematic structural diagram of the second refractive layer in the quantum dot diffuser plate is shown, wherein the angle between the length direction of the second refractive body and the width direction of the quantum dot diffuser plate is 0°.

[0029] Fig.13 A third structural schematic diagram of the quantum dot diffusion plate provided in an embodiment of the present application.

[0030] Fig.14 for Fig.13 Left side view of the quantum dot diffuser plate shown.

[0031] Fig.15 This is a fourth structural schematic diagram of the quantum dot diffusion plate provided in an embodiment of the present application.

[0032] Fig.16 for Fig.15 Left side view of the quantum dot diffuser plate shown.

[0033] Fig.17 This is a fifth structural schematic diagram of the quantum dot diffusion plate provided in an embodiment of the present application.

[0034] Fig.18 for Fig.17 Left side view of the quantum dot diffuser plate shown.

[0035] Description of Figure Numbers:

[0036] 100, quantum dot diffusion plate; 110, refractive layer; 111, first refractive layer; 1111, first refractive body; 1112, first substrate; 112, second refractive layer; 1121, second refractive body; 1122, second substrate; 120, quantum dot diffusion layer; 130, foaming diffusion layer; 200, light source. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0039] In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The term "and / or" includes any and all combinations of one or more of the associated listed items.

[0040] The present application provides a display device, which includes a backlight module. Figures 1 to 18 As shown, the backlight module includes a light source 200 and a quantum dot diffusion plate 100, the quantum dot diffusion plate 100 includes a refraction layer 110 and a quantum dot diffusion layer 120 which are stacked, the light source 200 is arranged on the side of the refraction layer 110 away from the quantum dot diffusion layer 120, or in other words, the refraction layer 110 is arranged on the side of the quantum dot diffusion layer 120 close to the light source 200.

[0041] Among them, the refraction layer 110 of the quantum dot diffuser plate 100 includes a first refraction layer 111 and a second refraction layer 112 which are stacked; the first refraction layer 111 includes a plurality of strip-shaped first refractors 1111, and the plurality of first refractors 1111 are arranged in sequence along the width direction T of the quantum dot diffuser plate 100; the second refraction layer 112 includes a plurality of strip-shaped second refractors 1121, and the plurality of second refractors 1121 are arranged in sequence along the length direction M of the quantum dot diffuser plate 100, and the length direction A of the first refractor 1111 intersects with the length direction B of the second refractor 1121.

[0042] In the present application, the first refraction layer 111 and the second refraction layer 112 of the refraction layer 110 are stacked so that the plurality of strip-shaped first refractors 1111 of the first refraction layer 111 are sequentially arranged along the width direction T of the quantum dot diffusion plate 100, and the plurality of strip-shaped second refractors 1121 of the second refraction layer 112 are sequentially arranged along the length direction M of the quantum dot diffusion plate 100, and the length direction A of the first refractor 1111 intersects with the length direction B of the second refractor, so that the light emitted by the light source 200 can be refracted through the two refraction layers with different structures, so that the light emission angle is effectively expanded and then the quantum dot material in the quantum dot diffusion layer 120 is excited to form a surface light source 200 with high color uniformity, thereby enabling the display device to maintain high color uniformity when the partition light control function is turned on, thereby achieving a good display effect.

[0043] Optionally, the included angle α between the length direction A of the first refractive body 1111 and the length direction M of the quantum dot diffuser 100 is 0° (i.e., the length direction A of the first refractive body 1111 is parallel to the length direction M of the quantum dot diffuser 100, such as 0°≤α≤45°). Figure 5 and Fig.11 As shown), 5°, 9° (as shown Figure 6 As shown), 10°, 15°, 20°, 25°, 30°, 35°, 40° or 45°, etc., and can be set according to actual needs.

[0044] Optionally, the included angle β between the length direction B of the second refractive body 1121 and the width direction T of the quantum dot diffuser plate 100 is 0°, 0°≤β≤45°. Exemplarily, the included angle β between the length direction B of the second refractive body 1121 and the width direction T of the quantum dot diffuser plate 100 may be 0° (i.e., the length direction B of the second refractive body 1121 is parallel to the width direction T of the quantum dot diffuser plate 100, as shown in FIG. Figure 7 and Fig.12 As shown), 5°, 8° (as shown Figure 8 As shown), 10°, 15°, 20°, 25°, 30°, 35°, 40° or 45°, etc., and can be set according to actual needs.

[0045] Optionally, the first refractive body 1111 may be in the shape of a triangular prism (eg, an isosceles triangular prism, such as Figure 5 and Figure 6 As shown), semi-cylindrical (as Fig.11 or, the first refraction body 1111 includes a plurality of first refraction parts arranged in sequence along the length direction A of the first refraction body 1111, and the shape of the first refraction part is a hemisphere or a semi-ellipsoid.

[0046] Optionally, the second refractive body 1121 may be in the shape of a triangular prism (eg, an isosceles triangular prism, such as Figure 7 and Figure 8 As shown), semi-cylindrical (as Fig.12 or, the second refraction body 1121 includes a plurality of second refraction parts arranged in sequence along the length direction B of the second refraction body 1121, and the shape of the second refraction part is a hemisphere or a semi-ellipsoid.

[0047] In some embodiments of the present application, the first refractor 1111 and the second refractor 1121 have the same shape. For example, the first refractor 1111 and the second refractor 1121 are both in the shape of a triangular prism (eg, Figure 3 to Figure 8 ), or the first refraction body 1111 and the second refraction body 1121 are both in the shape of a semi-cylinder (as shown in Figures 9 to 12 As shown), either the first refraction body 1111 and the second refraction body 1121 are both in the shape of a semi-elliptical cylinder; or the first refraction body 1111 includes a plurality of first refraction parts arranged in sequence along the length direction A of the first refraction body 1111, the second refraction body 1121 includes a plurality of second refraction parts arranged in sequence along the length direction B of the second refraction body 1121, and the first refraction parts and the second refraction parts are both in the shape of a hemisphere, or the first refraction parts and the second refraction parts are both in the shape of a semi-ellipsoid.

[0048] In other embodiments of the present application, the shapes of the first refractor 1111 and the second refractor 1121 may be different. For example, the shape of the first refractor 1111 is a triangular prism, and the shape of the second refractor 1121 is a semi-cylinder (eg, Fig.15 and Fig.16 or the first refraction body 1111 is in the shape of a semi-cylinder, and the second refraction body 1121 is in the shape of a triangular prism (as shown in Fig.13 and Fig.14 As shown) or a semi-elliptical cylinder; or, the first refractor 1111 is in the shape of a semi-elliptical cylinder, and the second refractor 1121 is in the shape of a semi-cylinder or a triangular prism; or, the first refractor 1111 includes a plurality of first refraction parts sequentially arranged along the length direction A of the first refractor 1111, and the second refraction part 1121 includes a plurality of second refraction parts sequentially arranged along the length direction B of the second refractor 1121, and the shape of the first refraction part is a hemisphere and the shape of the second refraction part is a semi-elliptical body, or the shape of the first refraction part is a semi-elliptical body and the shape of the second refraction part is a hemisphere; or, the first refraction part 1111 includes a plurality of first refraction parts sequentially arranged along the length direction A of the first refraction part 1111, and the shape of the first refraction part is a hemisphere, and the shape of the second refraction part 1121 is a triangular prism (as shown) or a semi-elliptical cylinder ... Fig.13 and Fig.14As shown), a semi-cylinder or a semi-elliptical cylinder; or, the first refractor 1111 includes a plurality of first refraction portions arranged in sequence along the length direction A of the first refraction body 1111, the shape of the first refraction portion is a semi-elliptical body, and the shape of the second refraction body 1121 is a triangular prism, a semi-cylinder or a semi-elliptical cylinder; or, the shape of the first refraction body 1111 is a triangular prism, a semi-cylinder or a semi-elliptical cylinder, and the second refraction body 1121 includes a plurality of second refraction portions arranged in sequence along the length direction B of the second refraction body 1121, and the shape of the second refraction portion is a hemisphere or a semi-ellipsoid.

[0049] Optionally, the maximum thickness of the first refractive body 1111 is 50 μm to 150 μm, for example, the maximum thickness H1 of the first refractive body 1111 can be 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm or 150 μm, etc., which can be set according to actual needs. By controlling the maximum thickness of the first refractive body 1111 to be 50 μm to 150 μm, not only can the light output angle of the light be effectively expanded, but also the production cost of the quantum dot diffusion plate 100 can be saved.

[0050] Optionally, the maximum thickness of the second refractive body 1121 is 50 μm to 150 μm, for example, the maximum thickness H2 of the second refractive body 1121 can be 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm or 150 μm, etc., which can be set according to actual needs. By controlling the maximum thickness of the second refractive body 1121 to be 50 μm to 150 μm, not only can the light output angle of the light be effectively expanded, but also the production cost of the quantum dot diffusion plate 100 can be saved.

[0051] In some embodiments of the present application, Figure 5 , Figure 6 and Fig.11 As shown, the first refractive layer 111 further includes a first substrate 1112, and a plurality of first refractive bodies 1111 are disposed on a surface of the first substrate 1112 that is away from the quantum dot diffusion layer 120. Optionally, the thickness of the first substrate 1112 is 0.2 mm to 0.8 mm, for example, the thickness of the first substrate 1112 may be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm or 0.8 mm, etc.

[0052] Optionally, the first refractive layer 111 may be transparent polystyrene (GPPS), polymethyl methacrylate (PMMA), polycarbonate (PC) or methyl methacrylate-styrene copolymer (MS), which may be selected according to actual needs.

[0053] In some embodiments of the present application, Figure 7 , Figure 8 and Fig.12 As shown, the second refractive layer 112 further includes a second substrate 1122, and a plurality of second refractive bodies 1121 are disposed on a surface of the second substrate 1122 that is away from the first refractive layer 111. Optionally, the thickness of the second substrate 1122 is 0.2 mm to 0.8 mm, for example, the thickness of the first substrate 1112 may be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm or 0.8 mm, etc.

[0054] Optionally, the material of the second refractive layer 112 may be transparent polystyrene (GPPS), polymethyl methacrylate (PMMA), polycarbonate (PC) or methyl methacrylate-styrene copolymer (MS), which may be selected according to actual needs.

[0055] It is understandable that the number of the first refractive layer 111 is one or more, and the number of the second refractive layer 112 is one or more, which can be set according to actual needs. When the first refractive layer 111 and the second refractive layer 112 are both one, the first refractive layer 111, the second refractive layer 112 and the quantum dot diffusion layer 120 are stacked in sequence (that is, the second refractive layer 112 is located between the first refractive layer 111 and the quantum dot diffusion layer 120), or the second refractive layer 112, the first refractive layer 111 and the quantum dot diffusion layer 120 are stacked in sequence (that is, the first refractive layer 111 is located between the second refractive layer 112 and the quantum dot diffusion layer 120).

[0056] In some embodiments of the present application, the number of one of the first refractive layer 111 and the second refractive layer 112 is N, and the number of the other is N+1, N≥1, and the first refractive layer 111 and the second refractive layer 112 are alternately arranged. Exemplarily, there is one first refractive layer 111 and two second refractive layers 112, wherein one second refractive layer 112, the first refractive layer 111, and the other second refractive layer 112 are sequentially stacked; or, there are two first refractive layers 111 and one second refractive layer 112, wherein one first refractive layer 111, the second refractive layer 112, and the other first refractive layer 111 are sequentially stacked.

[0057] In some other embodiments of the present application, the number of the first refractive layer 111 and the second refractive layer 112 are both M, M≥2, and the first refractive layer 111 and the second refractive layer 112 are alternately arranged. Exemplarily, there are two first refractive layers 111 and two second refractive layers 112, one first refractive layer 111, one second refractive layer 112, another first refractive layer 111, and another second refractive layer 112 are sequentially stacked, or one second refractive layer 112, one first refractive layer 111, another second refractive layer 112, and another first refractive layer 111 are sequentially stacked.

[0058] It should be noted that the quantum dot diffusion layer 120 includes a substrate, a quantum dot material and a diffusant. The substrate of the quantum dot diffusion layer 120 can be transparent polystyrene (GPPS), polymethyl methacrylate (PMMA), polycarbonate (PC) or methyl methacrylate-styrene copolymer (MS); when the light source 200 is a blue light source 200 (such as a blue light LED), the quantum dot material in the quantum dot diffusion layer 120 includes a red quantum dot material and a green quantum dot material, and the quantum dot material can be a cadmium selenide core-shell material (such as CdSe), a perovskite material or an indium phosphide material (such as InP), etc.; the diffusant in the quantum dot diffusion layer 120 can include at least one of acrylic acid, silicone and polyethylene, and the quantum dot diffusion layer 120 can be formed by extruding the diffusant and the quantum dot material after blending with the substrate material.

[0059] Optionally, the thickness of the quantum dot diffusion layer 120 is 0.5 mm to 1.5 mm, for example, the thickness of the quantum dot diffusion layer 120 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, etc., which can be set according to actual needs. By using a quantum dot diffusion layer 120 with a thickness of 0.5 mm to 1.5 mm, a good quantum dot excitation light intensity can be ensured, thereby improving the brightness of the quantum dot diffusion plate 100.

[0060] In some embodiments of the present application, Figure 1 to Figure 4 , Fig. 9 , Fig.10 , Figures 13 to 18 As shown, the quantum dot diffusion plate 100 further includes a foaming diffusion layer 130 having bubbles, and the refractive layer 110, the quantum dot diffusion layer 120 and the foaming diffusion layer 130 are sequentially stacked, that is, the foaming diffusion layer 130 is arranged on the side of the quantum dot diffusion layer 120 away from the refractive layer 110. By providing the foaming diffusion layer 130, the foaming diffusion layer 130 can diffuse and atomize the light to form more uniform light, thereby further improving the color uniformity of the display screen of the display device.

[0061] Specifically, the foaming diffusion layer 130 includes a substrate and a diffusing agent. The substrate of the foaming diffusion layer 130 can be transparent polystyrene (GPPS), polymethyl methacrylate (PMMA), polycarbonate (PC) or methyl methacrylate-styrene copolymer (MS), and the diffusing agent in the foaming diffusion layer 130 can include at least one of acrylic acid, silicone and polyethylene.

[0062] Optionally, the thickness of the foaming diffusion layer 130 is 0.5mm to 1.5mm. For example, the thickness of the foaming diffusion layer 130 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm, etc., which can be set according to actual needs. The inventors of the present application found that if the thickness of the foaming diffusion layer 130 is too large, the haze of the quantum dot diffusion plate 100 is too low and the light transmittance is high; if the thickness of the foaming diffusion layer 130 is too small, the haze of the quantum dot diffusion plate 100 is too high and the light transmittance is low. Therefore, the present application adopts a foaming diffusion layer 130 with a thickness of 0.5mm to 1.5mm, which can ensure that the quantum dot diffusion plate 100 has a suitable light transmittance and haze.

[0063] Specifically, the foaming diffusion layer 130 can form spherical or ellipsoidal bubbles in the diffusion layer through a physical foaming or chemical foaming process. Optionally, the average diameter of the bubbles in the foaming diffusion layer 130 is 100μm to 800μm, for example, it can be 100μm, 150μm, 200μm, 250μm, 300μm, 350μm, 400μm, 450μm, 500μm, 550μm, 600μm, 650μm, 700μm, 750μm or 800μm, etc., which can be set according to actual needs. By controlling the average diameter of the bubbles in the foaming diffusion layer 130 to be 100μm to 800μm, not only the haze of the quantum dot diffusion plate 100 can be guaranteed, but also the transmittance of light can be improved, so that the quantum dot diffusion plate 100 has a higher light transmittance.

[0064] Optionally, the bubble density of the foaming diffusion layer 130 is 0.7g / cm3 to 0.9g / cm3, for example, it can be 0.7g / cm3, 0.75g / cm3, 0.8g / cm3, 0.85g / cm3 or 0.9g / cm3, etc., which can be set according to actual needs. The inventors of the present application found that if the cross-sectional density of the bubbles in the foaming diffusion layer 130 is too small, the haze of the quantum dot diffusion plate 100 is small and the light transmittance is high; if the density of the foaming diffusion layer 130 is too large, the haze of the quantum dot diffusion plate 100 is large and the light transmittance is low. Therefore, the present application adopts the foaming diffusion layer 130 with the above-mentioned bubble density to ensure that the quantum dot diffusion plate 100 has a suitable light transmittance and haze.

[0065] In some embodiments of the present application, the first refractive layer 111, the second refractive layer 112, the quantum dot diffusion layer 120 and the foaming diffusion layer 130 are composited to form an integral body. Optionally, the first refractive layer 111 can be prepared by a hot pressing molding process, that is, after the quantum dot diffusion plate 100 is extruded from a multi-layer co-extrusion die head, it is pressed and replicated under high temperature conditions by a mold stick having a preset structure (such as a triangular prism structure, a semi-cylindrical structure or a semi-elliptical cylinder structure). Optionally, the second refractive layer 112 can be extruded and shaped by a multi-layer co-extrusion die head.

[0066] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0067] The quantum dot diffusion plate, backlight module and display device provided in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A quantum dot diffuser plate, characterized in that: The quantum dot diffusion plate (100) comprises a refraction layer (110) and a quantum dot diffusion layer (120) which are stacked, wherein the refraction layer (110) comprises a first refraction layer (111) and a second refraction layer (112) which are stacked; The first refractive layer (111) comprises a plurality of strip-shaped first refractive bodies (1111), and the plurality of first refractive bodies (1111) are arranged in sequence along the width direction of the quantum dot diffusion plate (100); The second refractive layer (112) comprises a plurality of strip-shaped second refractive bodies (1121), the plurality of second refractive bodies (1121) are arranged in sequence along the length direction of the quantum dot diffuser plate (100), and the length direction of the first refractive body (1111) intersects with the length direction of the second refractive body (1121).

2. The quantum dot diffuser plate according to claim 1, characterized in that: The included angle between the length direction of the first refractive body (1111) and the length direction of the quantum dot diffusion plate (100) is α, 0°≤α≤45°; And / or, the angle between the length direction of the second refractive body (1121) and the width direction of the quantum dot diffuser plate (100) is β, and 0°≤β≤45°.

3. The quantum dot diffuser plate according to claim 1, characterized in that: The first refractive body (1111) is in the shape of a triangular prism, a semi-cylinder or a semi-elliptical cylinder, or the first refractive body (1111) includes a plurality of first refractive parts arranged in sequence along the length direction of the first refractive body (1111), and the shape of the first refractive parts is a hemisphere or a semi-ellipsoid; And / or, the maximum thickness of the first refractive body (1111) is 50 μm to 150 μm.

4. The quantum dot diffuser plate according to claim 1, characterized in that: The second refractive body (1121) is in the shape of a triangular prism, a semi-cylinder or a semi-elliptical cylinder, or the second refractive body (1121) includes a plurality of second refractive parts arranged in sequence along the length direction of the second refractive body (1121), and the second refractive parts are in the shape of a hemisphere or a semi-ellipsoid; And / or, the maximum thickness of the second refractive body (1121) is 50 μm to 150 μm.

5. The quantum dot diffuser plate according to claim 1, characterized in that: The first refractive layer (111) further comprises a first substrate (1112), and a plurality of the first refractive bodies (1111) are arranged on a surface of the first substrate (1112) facing away from the quantum dot diffusion layer (120); And / or, the second refractive layer (112) further includes a second substrate (1122), and a plurality of the second refractive bodies (1121) are arranged on a surface of the second substrate (1122) facing away from the first refractive layer (111).

6. The quantum dot diffuser plate according to any one of claims 1 to 5, characterized in that: The number of the first refractive layer (111) and the number of the second refractive layer (112) are both one, and the first refractive layer (111), the second refractive layer (112) and the quantum dot diffusion layer (120) are stacked in sequence, or the second refractive layer (112), the first refractive layer (111) and the quantum dot diffusion layer (120) are stacked in sequence; Alternatively, the number of one of the first refractive layers (111) and the second refractive layers (112) is N, and the number of the other is N+1, where N≥1, and the first refractive layers (111) and the second refractive layers (112) are alternately arranged; Alternatively, the number of the first refractive layers (111) and the number of the second refractive layers (112) are both M, M≥2, and the first refractive layers (111) and the second refractive layers (112) are alternately arranged.

7. The quantum dot diffuser plate according to claim 1, characterized in that: The quantum dot diffusion plate (100) further comprises a foaming diffusion layer (130), and the refractive layer (110), the quantum dot diffusion layer (120) and the foaming diffusion layer (130) are stacked in sequence.

8. The quantum dot diffuser plate according to claim 7, characterized in that: The foaming diffusion layer (130) has bubbles, and the average diameter of the bubbles is 100 μm to 800 μm; And / or, the density of the foaming diffusion layer (130) is 0.7 g / cm3 to 0.9 g / cm3.

9. A backlight module, characterized in that: The backlight module comprises a light source (200) and a quantum dot diffusion plate (100) according to any one of claims 1 to 8, wherein the light source (200) is arranged on a side of the refractive layer (110) of the quantum dot diffusion plate (100) away from the quantum dot diffusion layer (120).

10. A display device, characterized in that: The display device comprises the backlight module according to claim 9.

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