Diffusion plate, backlight module and display device

Abstract

The embodiment of the invention provides a diffusion plate, a backlight module and a display device.The diffusion plate comprises a first substrate, a second substrate and a lattice point layer arranged between the first substrate and the second substrate, the lattice point layer comprises a plurality of lattice point pattern structures distributed in a scattered mode, and each lattice point pattern structure comprises a center lattice point and a peripheral lattice point surrounding the center lattice point; the curved surfaces of the central lattice points and the peripheral lattice points are in contact with the second substrate, the thickness of the first substrate is larger than that of the second substrate, and the first substrate, the second substrate and the lattice point pattern structure are used for scattering light. The lattice point layer is arranged between the first substrate and the second substrate to form the sandwich structure, the design of the sandwich structure has integrity, and the mechanical vibration test performance is excellent. Meanwhile, the diffusion plate comprises the three film layers with the light uniformizing effect, so that the light uniformizing effect of the diffusion plate can be further improved.

Description

Technical Field

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

[0002] The dots printed on the surface of the diffuser plate are generally placed on top or on the bottom. When the dots are placed on the bottom, the dots and the light source are prone to mutual wear. When the dots are placed on the top, the dot morphology can be seen above the backlight module, and the uniform light effect is poor. In order to improve the uniform light effect, a uniform light film needs to be added to uniform light, but the price of the uniform light film is relatively expensive. Therefore, the diffuser plate and the uniform light film are both used as components of the backlight module, which greatly increases the production cost of the backlight module. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a diffusion plate, a backlight module and a display device to solve the problem that the mesh dots are easily worn out between the mesh dots and the light source, and the mesh dots are placed upwards and the uniform light effect is poor. The specific technical solution is as follows:

[0004] In a first aspect, the present application provides a diffuser plate, which includes a first substrate, a second substrate, and a dot layer arranged between the first substrate and the second substrate, the dot layer including a plurality of dispersed dot pattern structures, the dot pattern structure including a central dot and peripheral dots surrounding the central dot, the thickness of the first substrate is greater than the thickness of the second substrate, and the first substrate, the second substrate and the dot pattern structure are used to scatter light.

[0005] In addition, the diffuser plate provided in the first aspect of the present application may also have the following technical features:

[0006] In some embodiments, the dot pattern structure includes a central dot and peripheral dots surrounding the central dot, the peripheral dots are dispersedly arranged at intervals, and the arrangement density of the peripheral dots gradually decreases in a direction away from the central dot.

[0007] In some embodiments, the central dot is hemispherical, the peripheral dot is one or two of hemispherical, conical or rod-shaped, and the outer contour of a single dot pattern structure is circular or regular polygonal.

[0008] In some embodiments, the central mesh point is hemispherical, the peripheral mesh points are cone-shaped or rod-shaped, and the peripheral mesh points are radially connected to the periphery of the central mesh point.

[0009] In some embodiments, the thickness of the first substrate is 0.7 mm-1.2 mm, the thickness of the second substrate is 0.5 mm-0.9 mm, and the thickness of the dot layer is 0.01 mm-0.03 mm.

[0010] In some embodiments, the thickness of the first substrate is 1.0 mm, the thickness of the second substrate is 0.8 mm, and the thickness of the dot layer is 0.012 mm.

[0011] In some embodiments, the central dots and the peripheral dots are ink dots, the light transmittance of the ink dots is 8%-12%, and the light reflectivity of the ink dots is 75%-85%.

[0012] In some embodiments, scattering particles are dispersed in the first substrate and the second substrate, and the light transmittance of the first substrate and the second substrate is 40%-50%.

[0013] The second aspect of the present application provides a backlight module, which includes: a base substrate; a light source, which is arranged on one side of the base substrate; a diffusion plate, which is the diffusion plate described above, and is arranged on a side of the light source away from the base substrate, the first substrate is arranged close to the light source, and each of the dot pattern structures corresponds to an independent light source.

[0014] In some embodiments, the orthographic projection of the central grid point on the base substrate overlaps with the orthographic projection of the light source on the base substrate, and the orthographic projection area of ​​the central grid point on the light source is greater than or equal to the orthographic projection area of ​​the peripheral grid points on the light source.

[0015] In some embodiments, the light source is an LED light source array, a packaging layer is provided on a side of the light source array away from the substrate, the packaging layer is used to package the LED light source array, and the diffusion plate is provided in contact with the packaging layer.

[0016] A third aspect of the present application provides a display device, which includes the backlight module described above.

[0017] Beneficial effects of the embodiments of the present application:

[0018] The diffuser provided in the embodiment of the present application has a dot layer disposed between the first substrate and the second substrate to form a sandwich structure. The three layers of the diffuser form a whole and are not prone to shaking with each other. Therefore, the first substrate and the second substrate can protect the dot layer and avoid wear caused by shaking between the layers. The sandwich structure is designed to be holistic, which can avoid shaking of the various film materials in the module due to unreasonable gap reservation or tolerance, and the mechanical vibration test performance is excellent. At the same time, since the diffuser includes three layers of film layers with uniform light effect, the uniform light effect of the diffuser can be further improved.

[0019] Of course, implementing any product or method of the present application does not necessarily require achieving all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0021] Figure 1 A schematic diagram of the cross-sectional structure of a diffusion plate provided in an embodiment of the present application;

[0022] Figure 2 is a schematic diagram of the scattering effect of the first substrate on light;

[0023] Figure 3 It is a schematic diagram of the optical principle of refraction, scattering and reflection of light inside the first substrate;

[0024] Figure 4 Schematic diagram of the light uniformity effect of a common diffuser;

[0025] Figure 5 This is a schematic diagram of the uniform light effect of a common diffuser plate + uniform light film;

[0026] Figure 6 A schematic diagram of the light uniformity effect of the diffuser provided in an embodiment of the present application;

[0027] Figure 7 A schematic diagram of a top view structure of a mesh point layer provided in an embodiment of the present application;

[0028] Figure 8 A schematic diagram of a top view structure of a mesh point layer provided in an embodiment of the present application in another embodiment;

[0029] Fig. 9 A schematic diagram of a top view structure of a mesh point layer provided in an embodiment of the present application in another embodiment;

[0030] Fig.10 A schematic diagram of a top view structure of a mesh point layer provided in an embodiment of the present application in another embodiment;

[0031] Fig.11 This is a schematic diagram of the cross-sectional structure of the backlight module provided in an embodiment of the present application.

[0032] The reference numerals are as follows: diffuser 10 ; first substrate 11 ; scattering particles 111 ; second substrate 12 ; mesh dot layer 13 ; mesh dot pattern structure 131 ; central mesh dot 131 a ; peripheral mesh dot 131 b ; base substrate 20 ; light source 30 ; encapsulation layer 40 . DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field based on the present application belong to the scope of protection of the present application.

[0034] In a first aspect, an embodiment of the present application provides a diffusion plate 10, such as Figure 1 As shown, the diffuser 10 includes a first substrate 11, a second substrate 12, and a dot layer 13 disposed between the first substrate 11 and the second substrate 12. The dot layer 13 includes a plurality of dispersed dot pattern structures 131, the dot pattern structure 131 includes a central dot 131a and peripheral dot 131b surrounding the central dot 131a, the thickness of the first substrate 11 is greater than the thickness of the second substrate 12, and the first substrate 11, the second substrate 12 and the dot pattern structure 131 are used to scatter light.

[0035] In this embodiment, the dot layer 13 is disposed between the first substrate 11 and the second substrate 12 to form a sandwich structure. The three layers of the diffuser 10 form a whole and are not prone to shaking each other. Therefore, the first substrate 11 and the second substrate 12 can protect the dot layer 13 and avoid wear caused by shaking between the layers. The sandwich structure is designed with integrity, which can avoid shaking of each film material in the module due to unreasonable gap reservation or tolerance, and the mechanical vibration test performance is excellent.

[0036] Since the diffuser 10 includes two substrates 20, the first substrate 11 and the second substrate 12, both of which can scatter light, an additional light-homogenizing layer is added compared to the diffuser in the traditional solution, so it can have a better light-homogenizing effect. Moreover, the dot pattern structure 131 of the dot layer 13 can also scatter light, including reflection and slight transmission, so the light-homogenizing effect of the diffuser 10 can be further improved. In addition, a substrate 20 is also provided above the dot layer 13, which can achieve the concealment of the morphology of the dot layer 13 and further improve the light-homogenizing effect.

[0037] Since the first substrate 11, the dot layer 13 and the second substrate 12 all have a uniform light effect, they can well shield the light shadow, and can also reduce the number of other film materials used and reduce costs, such as uniform light films, composite films, etc.

[0038] The sandwich structure diffuser 10 is used. In the backlight module, the LED light is projected and scattered through the first substrate 11, and then reaches the dot layer 13. It is reflected and slightly transmitted through the dot ink, and then reaches the upper second substrate 12, and continues to transmit light, finally achieving a better uniform light effect. Figure 2Taking the first substrate 11 as an example, the scattering effect of the first substrate 11 on light is illustrated. Figure 3 FIG. 1 is a schematic diagram of the optical principle of refraction, scattering and reflection of light inside the first substrate 11, wherein light A is the incident light, light B is the diffusely reflected light, and light C is the reflected light. To further illustrate the uniform light effect of the diffuser 10 in this embodiment, Figure 4-Figure 6 As shown, the light homogenization effect of the common diffuser 10 (diffuser 10 with dots placed on top or dots placed on the bottom), the common diffuser 10 + light homogenization film and the light homogenization effect of the diffuser 10 with a sandwich structure are compared. Figure 4 is a schematic diagram of the light uniformity effect of a common diffuser 10, Figure 5 This is a schematic diagram of the uniform light effect of a common diffuser 10 + uniform light film. Figure 6 Schematic diagram of the light uniformity effect of the sandwich structure diffuser 10 of the embodiment of the present application, Figure 6 There are no horizontal and vertical stripes in the image, which means there is no light shadow and it has a better light uniformity effect. Figure 4 , Figure 5 There are different degrees of horizontal and vertical cross stripes, that is, there are light shadows, especially Figure 4 Severe lighting shadows.

[0039] In this embodiment, the thickness of the first substrate 11 is greater than that of the second substrate 12. Generally, the first substrate 11 with a larger thickness is used as the lower substrate, that is, when the diffuser 10 is in use, light enters from the first substrate 11 to the dot layer 13, and then enters the second substrate 12. On the other hand, the first substrate 11 with a larger thickness is used as the lower substrate because the first substrate 11 with a larger thickness can increase the number of refractions of the light, improve the light homogenization effect, and increase the amount of light entering the dot layer 13, thereby improving the utilization rate of the light. After the light passes through the first substrate 11 and the dot layer 13 for two times of homogenization, the ability of the second substrate 12 to homogenize the light is reduced. Therefore, the second substrate 12 can be slightly thinned, thereby reducing the overall thickness of the diffuser 10, which is conducive to the thinning of the diffuser 10. When the first substrate 11 is used as the lower substrate, the central dot 131a and the peripheral dot 131b are made on the first substrate 11 by spraying, screen / stencil printing, or laser, and the second substrate 12 is covered on the dot layer 13 after drying. The dot layer 13 formed based on this manufacturing process has a central dot 131a and a peripheral dot 131b whose side in contact with the first substrate 11 is closer to a plane, and whose side in contact with the second substrate 12 is closer to a spherical surface, so that the central dot 131a and the peripheral dot 131b have a structure similar to a hemispherical shape. The dot design size is in the range of 0.1mm-0.4mm, and the size refers to the diameter or side length. The first substrate 11 and the second substrate 12 can be co-extruded in a traditional manner, and the material can be selected from PS, PC and other materials according to business needs.

[0040] In some embodiments, Figure 7-10 The schematic diagram of the structure of the dot layer 13 in a top view is shown. The peripheral dots 131 b are dispersedly arranged at intervals. The arrangement density of the peripheral dots 131 b gradually decreases in the direction away from the central dot 131 a.

[0041] In this embodiment, the dot pattern structure 131 may also include central dots 131a and peripheral dots 131b, and the peripheral dots 131b are dispersed and spaced apart, breaking the dot pattern structure 131 into smaller parts can reduce the overall shielding area of ​​the dot pattern structure 131. Considering that the light intensity at different positions in the reflection area is not the same, in order to further improve the uniformity of the reflected light, this embodiment preferably adjusts the distribution density of the dots in the dot layer 13 gradually, and follows the rule that the higher the light intensity, the greater the dot density, and the weaker the light intensity, the smaller the dot density, so that the higher the light intensity, the lower the reflectivity; the weaker the light intensity, the higher the reflectivity. Since the area with stronger light intensity is generally the center position of the light source 30, preferably, the arrangement density of the central mesh point 131a is greater than the arrangement density of the peripheral mesh points 131b. The central mesh point 131a corresponds to the area with higher light intensity, and can reflect more light irradiated to the central mesh point 131a, and after multiple reflections and refractions, it is emitted from the area corresponding to the weaker light intensity on the diffuser plate 10. Through the difference in the arrangement density of the central mesh point 131a and the peripheral mesh point 131b, the light emitted from the area corresponding to the higher light intensity of the diffuser plate 10 is reduced, and the light emitted from the area corresponding to the weaker light intensity of the diffuser plate 10 is increased. The design of the mesh point pattern structure 131 in the mesh point layer 13 enables the diffuser plate 10 to have a uniform light effect.

[0042] The dot arrangement density here refers to the proportion of the area of ​​sprayed or printed dots per unit area. The more area the dots occupy per unit area, the greater the dot arrangement density; conversely, the smaller the area the dots occupy per unit area, the smaller the dot arrangement density. In the process of gradually processing the arrangement density of dots in the dot pattern structure 131, two methods can be used: one is to arrange the same number of dots per unit area, and change the dot arrangement density by adjusting the area of ​​each dot per unit area; the other is to arrange dots of equal area per unit area, and change the dot arrangement density by adjusting the number of dots per unit area.

[0043] There is no restriction on the shape of the dots, such as Figure 7-10As shown, the central dot 131a may be hemispherical, and the peripheral dot 131b may be any one or two of a hemispherical, conical or rod-shaped. The outer contour of a single dot pattern structure 131 is a circle or a regular polygon. The so-called hemispherical shape refers to a shape similar to a hemisphere, but it does not mean that it is exactly half of a sphere. It may be larger or smaller than half of a sphere, preferably smaller than half of a sphere. The so-called cone means that the cross-sectional area tends to decrease in the direction away from the central dot, similar to a needle. The outer contour of a single dot pattern structure 131 is a circle or a regular polygon, which is more consistent with the light intensity distribution of the light source 30, so that the light intensity on the surface of the diffuser plate 10 can be evenly distributed by designing the density of the dot arrangement, thereby improving the uniform light effect of the diffuser plate 10. Among them, as Figure 7 As shown, the central dot 131a and the peripheral dot 131b are both hemispherical, and the outer contour of the single dot pattern structure 131 is circular, such as Figure 8 As shown, the central dot 131a and the peripheral dot 131b are both hemispherical, and the outer contour of a single dot pattern structure 131 is a diamond shape, such as Fig. 9 The central dot 131a is hemispherical, and the peripheral dot 131b is conical. Fig.10 The central mesh dots 131a are hemispherical, and the peripheral mesh dots 131b include two types, namely conical and hemispherical, and the hemispherical peripheral mesh dots 131b are dispersed between the adjacent conical peripheral mesh dots 131b.

[0044] Specifically, Fig. 9 As shown, the central mesh point 131a is hemispherical, the peripheral mesh points 131b are conical or rod-shaped, and the peripheral mesh points 131b are radially connected to the periphery of the central mesh point 131a. In this embodiment, the hemispherical central mesh points 131a and the conical peripheral mesh points 131b together form a polygonal star-shaped mesh point pattern structure 131 to diverge the light, which can improve the uniform light effect of the diffuser 10. Moreover, the outer contour of a single mesh point pattern structure 131 is also roughly circular.

[0045] Furthermore, if Fig.10 As shown, in Fig. 9 On the basis of the embodiment shown, hemispherical peripheral dots 131b may be dispersed between adjacent peripheral dots 131b, and the hemispherical peripheral dots 131b located between the conical peripheral dots 131b may also diverge the light, thereby having a better light uniformity effect, and can further improve the light uniformity effect of the diffuser 10.

[0046] It is understandable that the cone-shaped or rod-shaped peripheral dots 131b may not be in direct contact with the central dots 131a, and the two may be arranged at intervals.

[0047] Specifically, the thickness of the first substrate 11 is 0.7mm-1.2mm, for example, the thickness of the first substrate 11 can be 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, etc. The thickness of the second substrate 12 is 0.5mm-0.9mm, for example, the thickness of the second substrate 12 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, etc. The thickness of the dot layer 13 is 0.01mm-0.03mm, for example, the thickness of the dot layer 13 can be 0.01mm, 0.011mm, 0.012mm, 0.015mm, 0.02mmm, 0.025mm, etc. The above thickness setting can minimize the thickness of the diffuser 10 while preventing light from generating light spots or lamp shadows on the diffuser 10, thereby affecting the display effect of the display device formed subsequently. This is because the thickness of the diffuser 10 affects the number of times the light is refracted in the diffuser 10. The thicker the diffuser 10 is, the more times the light is refracted, which can increase the shielding ability of the diffuser 10. On the contrary, the thinner the diffuser 10 is, the fewer times the light is refracted, which weakens the shielding ability of the diffuser 10. Therefore, in the case of not increasing the thickness of the diffuser 10 as much as possible, the thickness of the diffuser 10 has a reasonable range according to actual conditions, such as the distance from the light source 30 and the distribution of the light source 30.

[0048] Preferably, the thickness of the first substrate 11 is 1.0 mm, the thickness of the second substrate 12 is 0.8 mm, and the thickness of the dot layer 13 is 0.012 mm. The diffuser plate 10 meeting the thickness parameters has a better light uniformity effect.

[0049] As an optional method, the central dot 131a and the peripheral dot 131b are ink dots, the light transmittance of the ink dot is 8%-12%, and the light reflectance of the ink dot is 75%-85%. Ink has good adhesion and a wide range of printing materials. Selecting ink dots as dots can reduce the difficulty of the process and save costs. The light transmittance of the ink dot is set to 8%-12%, and the light reflectance is set to 75%-85%, so that the ink dot can refract and reflect the light multiple times, thereby achieving the effect of uniform light.

[0050] Preferably, the light reflectivity of the ink dots is 80% and the light transmittance is 10%.

[0051] Furthermore, scattering particles 111 are dispersed in the first substrate 11 and the second substrate 12, and the transmittance of the first substrate 11 and the second substrate 12 can be 40%-50%, preferably 45%. Since the scattering particles 111 are dispersed in the first substrate 11 and the second substrate 12, light is refracted, scattered and reflected on the surface and inside of the first substrate 11 and the second substrate 12, so that small-angle incident light can propagate in all directions after passing through the scattering particles 111, realizing uniform distribution of light, thereby achieving a uniform light effect.

[0052] The specific specifications of the reflectivity and transmittance of the above ink dots, the first substrate 11 and the second substrate 12 can be selected according to the actual effect, whether to select high transmittance or high reflectivity.

[0053] A second aspect of the present application provides a backlight module, such as Fig.11 As shown, the backlight module includes: a base substrate 20, a light source 30 and a diffusion plate 10. The light source 30 is arranged on one side of the base substrate 20; the diffusion plate 10 is the diffusion plate 10 described above, the diffusion plate 10 is arranged on the side of the light source 30 away from the base substrate 20, the first substrate 11 is arranged close to the light source 30, and each dot pattern structure 131 corresponds to an independent light source 30.

[0054] In the present embodiment, the light emitted by the light source 30 generally has a greater intensity at a position closer to the center of the light source 30, and conversely, the farther from the center of the light source 30, the weaker the intensity of the light, so that visual Mura appears on the surface. The scattering particles 111 of the first substrate 11 and the second substrate 12 of the diffuser 10 and the dot pattern structure 131 of the dot layer 13 can refract, reflect or scatter the light, thereby achieving a uniform light effect, so that after the light from the light source 30 passes through the diffuser 10, the visual difference between light and dark cannot be distinguished. The diffuser 10 in the embodiment of the present application, its first substrate 11, the dot layer 13 and the second substrate 12 all have a uniform light effect, which further improves the uniform light effect of the diffuser 10. Moreover, the diffuser 10 with a sandwich structure as a whole can avoid the phenomenon of dot shedding, misalignment, LED wear and insufficient uniform light in each stage of the reliability test.

[0055] In some embodiments, Figure 7 , Figure 8 and Fig.10 As shown, the orthographic projection of the central dot 131a on the base substrate 20 overlaps with the orthographic projection of the light source 30 on the base substrate 20 , and the orthographic projection area of ​​the central dot 131a on the light source 30 is greater than or equal to the orthographic projection area of ​​the peripheral dot 131b on the light source 30 .

[0056] In this embodiment, the orthographic projection area of ​​the central dot 131a on the light source 30 is larger than the orthographic projection area of ​​the peripheral dot 131b on the light source 30. Therefore, the central dot 131a has a stronger refraction, reflection or scattering ability, and the light intensity at the center position of the light source 30 is stronger. Therefore, through the differentiated design of the orthographic projection areas of the central dot 131a and the peripheral dot 131b, the light emitted from the area with higher light intensity corresponding to the diffuser 10 can be reduced, and the light emitted from the area with weaker light intensity corresponding to the diffuser 10 can be increased, thereby further improving the uniform light effect of the diffuser 10.

[0057] In some embodiments, the light source 30 is an LED light source 30 array. A packaging layer 40 is disposed on the side of the light source 30 array away from the substrate. The packaging layer 40 is used to package the LED light source 30 array. The diffusion plate 10 is disposed in contact with the packaging layer 40 .

[0058] The diffuser plate 10 provided in this embodiment has improved light uniformity capability due to its special sandwich structure, and the dot layer 13 is not easily worn by other film layers due to the protection of the first substrate 11 and the second substrate 12. Therefore, the diffuser plate 10 can be arranged in contact with the encapsulation layer. The contact arrangement of the diffuser plate 10 and the encapsulation layer further reduces the thickness of the backlight module, which is conducive to the thinness of the backlight module.

[0059] Among them, the LED light source 30 array can be a direct-type LED light source 30 array. For a backlight module designed with this direct-type LED backlight source 30 technology, the more LEDs are used and the smaller the spacing between the LEDs, the better the light mixing effect; at the same time, the larger the light mixing distance, the better the light mixing effect. However, when the number of LEDs is increased, the cost of the backlight module will increase significantly due to the expensive LEDs and lenses; and the method of increasing the light mixing distance will increase the thickness of the product, thereby affecting the aesthetic appearance of the entire product. By adopting the diffuser plate 10 of the sandwich structure provided in the embodiment of the present application, the light uniformity ability of the diffuser plate 10 is improved, so the light mixing distance can be reduced, and the diffuser plate 10 can be arranged in contact with the encapsulation layer of the LED light source 30, that is, the light mixing distance is reduced to zero, and the number of LED light sources 30 can be reduced, saving costs. Since the light mixing distance can be reduced to zero, this also greatly reduces the thickness of the backlight module.

[0060] A third aspect of the present application provides a display device, which includes the backlight module described above.

[0061] The display device of the embodiment of the present application includes a backlight module which uses a diffuser plate 10 with a sandwich structure, thereby reducing the thickness of the backlight module. In addition, the diffuser plate 10 with the sandwich structure has an additional layer of substrate, thereby improving the light uniformity capability of the diffuser plate 10. Therefore, the thickness of the display device is reduced while ensuring the display effect of the display device, which is conducive to making the display device lighter and thinner.

[0062] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0063] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0064] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A diffuser plate, characterized in that: The diffuser plate includes a first substrate, a second substrate, and a dot layer arranged between the first substrate and the second substrate, the dot layer includes a plurality of dispersed dot pattern structures, the dot pattern structure includes a central dot and peripheral dots surrounding the central dot, the thickness of the first substrate is greater than the thickness of the second substrate, and the first substrate, the second substrate and the dot pattern structure are used to scatter light.

2. The diffuser plate according to claim 1, characterized in that: The peripheral mesh points are arranged at dispersed intervals, and the arrangement density of the peripheral mesh points gradually decreases in the direction away from the central mesh point.

3. The diffuser plate according to claim 2, characterized in that: The central dot is hemispherical, the peripheral dot is any one or two of hemispherical, conical or rod-shaped, and the outer contour of a single dot pattern structure is circular or regular polygonal.

4. The diffuser plate according to claim 3, characterized in that: The central mesh point is hemispherical, the peripheral mesh points are cone-shaped or rod-shaped, and the peripheral mesh points are radially connected to the periphery of the central mesh point.

5. The diffuser plate according to claim 1, characterized in that: The thickness of the first substrate is 0.7 mm-1.2 mm, the thickness of the second substrate is 0.5 mm-0.9 mm, and the thickness of the dot layer is 0.01 mm-0.03 mm.

6. The diffuser plate according to claim 5, characterized in that: The thickness of the first substrate is 1.0 mm, the thickness of the second substrate is 0.8 mm, and the thickness of the dot layer is 0.012 mm.

7. The diffuser plate according to any one of claims 1 to 6, characterized in that: The central dots and the peripheral dots are ink dots, the light transmittance of the ink dots is 8%-12%, and the light reflectivity of the ink dots is 75%-85%.

8. The diffuser plate according to any one of claims 1 to 6, characterized in that: Scattering particles are dispersed in the first substrate and the second substrate, and the light transmittance of the first substrate and the second substrate is 40%-50%.

9. A backlight module, characterized in that: The backlight module comprises: substrate substrate; A light source, the light source is arranged on one side of the substrate; A diffusion plate, wherein the diffusion plate is the diffusion plate according to any one of claims 1 to 8, wherein the diffusion plate is arranged on a side of the light source away from the base substrate, the first substrate is arranged close to the light source, and each of the dot pattern structures corresponds to an independent light source.

10. The backlight module according to claim 9, characterized in that: The orthographic projection of the central grid point on the base substrate overlaps with the orthographic projection of the light source on the base substrate, and the orthographic projection area of ​​the central grid point on the light source is greater than or equal to the orthographic projection area of ​​the peripheral grid points on the light source.

11. The backlight module according to claim 9, characterized in that: The light source is an LED light source array. A packaging layer is arranged on a side of the light source array away from the substrate. The packaging layer is used to package the LED light source array. The diffusion plate is arranged in contact with the packaging layer.

12. A display device, characterized in that: The display device comprises the backlight module according to any one of claims 10-11.

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