A graded rayleigh scatter plate and a graded rayleigh scatter module

Abstract

The utility model relates to the field of lighting equipment, specifically discloses a kind of gradually variable rayleigh scattering plate, light guide plate body, first light scattering particle and second light scattering particle are scattered in the light guide plate body, the diameter of the first light scattering particle is 10-100nm, the diameter of the second light scattering particle is 10-100 μm.The utility model embodiment further discloses a kind of gradually variable rayleigh scattering module.Adopting the utility model, it can be used monochromatic light source and the gradually variable rayleigh scattering plate of integrated cooperation, form the light-emitting module with blue and red area and the gradually variable area between both, realize blue sky-sunset effect, control simple, low in cost, small thickness.

Description

Technical Field

[0001] This utility model relates to a lighting device, and more particularly to a gradient Rayleigh scattering plate and a gradient Rayleigh scattering module. Background Technology

[0002] Rayleigh diffusers are the core component of skylights that produce blue light. The principle behind them is that when light waves encounter microscopic particles (such as gas molecules, atoms, or density fluctuations) that are much smaller than their wavelength (usually less than 1 / 10 of the wavelength), elastic scattering occurs. The intensity of this scattering is inversely proportional to the fourth power of the incident light wavelength (i.e., shorter wavelength light is scattered more strongly), and the scattering direction is anisotropic.

[0003] Conventional Rayleigh scattering light guides simulate the blue sky in the following ways:

[0004] 1. Nanoparticle doping: Nanoscale scattering particles (such as titanium dioxide and silicon dioxide) are uniformly dispersed in a transparent substrate (such as PMMA and PC), with the particle size controlled within the blue light wavelength range, preferentially scattering blue light.

[0005] 2. Optical path design: When the light emitted by the light source (usually a cool color temperature white LED) passes through the light guide plate, the blue light is scattered in all directions to form a uniform "blue sky" effect, while the remaining light that is not scattered (containing more red light) is transmitted to form "sunlight spots".

[0006] Rayleigh scattering light guides with the aforementioned structure achieve uniform light emission through the even distribution of scattering particles, but they struggle to achieve spatial color zoning control. For example, Rayleigh scattering light guides can only produce uniform blue light, failing to meet the requirements for color zoning. To generate different colors of light in different areas of the Rayleigh scattering light guide, existing technologies generally employ multi-color light source combinations or complex optical films, resulting in large system size and high cost. Therefore, there is an urgent need to propose a technical solution that can achieve low-cost, high-precision spatial color zoning. Utility Model Content

[0007] To address the shortcomings of existing technologies, this invention provides a gradient Rayleigh scattering plate and a gradient Rayleigh scattering module. It can utilize a monochromatic light source in conjunction with an integrated gradient Rayleigh scattering plate to form a light-emitting module with blue and red areas and a gradient area between them, achieving a blue sky-evening effect. It is simple to control, low in cost, and thin.

[0008] To solve the above-mentioned technical problems, this utility model provides a light guide plate body, in which first light scattering particles and second light scattering particles are dispersed. The diameter of the first light scattering particles is 10-100 nm, and the diameter of the second light scattering particles is 10-100 μm.

[0009]

[0010] Rayleigh scattering equation: represents the ratio of light deflected along the θ direction. The scattering intensity depends on the wavelength λ of the incident light.

[0011] S(λ,θ,h)=β(λ,h)γ(θ)

[0012] Rayleigh scattering coefficient: It represents the ratio of light loss to scattering after a single collision.

[0013] Rayleigh scattering intensity is inversely proportional to the fourth power of the wavelength of light; therefore, short-wavelength blue light (400-450 nm) is scattered more significantly than long-wavelength red light (600-700 nm).

[0014] As an improvement to the above solution, the light guide plate is configured to have a first region and a second region, wherein a first light-scattering particle is disposed in the first region and a second light-scattering particle is disposed in the second region.

[0015] The first region and the second region are located in different height layers of the gradient Rayleigh scattering plate, or the first region and the second region are located at different positions on the same plane of the gradient Rayleigh scattering plate.

[0016] As an improvement to the above scheme, the density of the first light-scattering particles in the first region is greater than the density of the second light-scattering particles in the second region.

[0017] As an improvement to the above scheme, when the first region and the second region are located in different height layers of the gradient Rayleigh scattering plate, the thickness of the height layer where the first region is located is greater than twice that of the height layer where the second region is located.

[0018] As an improvement to the above solution, the surface of the second region is provided with a frosted surface or a microlens array.

[0019] As an improvement to the above scheme, the particle size of the first light scattering particle is 30-60 nm, and the particle size of the second light scattering particle is 20-60 μm.

[0020] As an improvement to the above scheme, the thickness of the first region is 450-550 μm, and the thickness of the second region is 150-250 μm.

[0021] As an improvement to the above scheme, the first light-scattering particle is titanium dioxide, and the second light-scattering particle is organosilicon microspheres.

[0022] Accordingly, this utility model embodiment also provides a gradient Rayleigh scattering module, including the gradient Rayleigh scattering plate as described above, wherein a light source is provided on one side of the gradient Rayleigh scattering plate, and the light emitted by the light source enters from the side of the gradient Rayleigh scattering plate.

[0023] As an improvement to the above solution, when the first region and the second region are located in different height layers of the gradient Rayleigh scattering plate, the light source is placed in the reflector cup, and the reflector cup is tilted so that the light source emits light at a predetermined angle to the gradient Rayleigh scattering plate.

[0024] When the first region and the second region are located at different positions on the same plane of the gradient Rayleigh scattering plate, the light source faces the side of the gradient Rayleigh scattering plate, so that the emitted light enters the gradient Rayleigh scattering plate in parallel.

[0025] As an improvement to the above solution, a light guide structure is provided at a predetermined position between the first region and the second region; the light guide structure is a first grating, which is horizontally arranged and the opening size gradually increases from the side closer to the light source to the side farther away from the light source; or the light guide structure is a second grating, which is vertically arranged and the opening size gradually increases from top to bottom.

[0026] Implementing the embodiments of this utility model has the following beneficial effects:

[0027] Using the above structure, a light-emitting module with blue and red areas and a gradient area between them can be formed by combining a monochromatic light source with an integrated gradient Rayleigh diffuser, creating a blue sky-twilight effect. This is simple to control, low in cost, and thin.

[0028] Because the first light-scattering particles have a smaller diameter, they match the wavelength of blue light, strongly scattering it to create a blue sky effect. The second light-scattering particles have a larger diameter, matching the wavelength of red light, reducing blue light scattering and allowing more red light to pass through, creating a red sunset effect. By combining these two particles with the angle of the incident light, light can be emitted from different positions in the first and second regions, creating a sunset sky effect with a gradual transition. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of an embodiment of a gradient Rayleigh scattering plate according to the present invention;

[0030] Figure 2 This is a diagram illustrating the working state of a gradient Rayleigh scattering plate according to this utility model.

[0031] Figure 3 This is a color temperature distribution curve of the gradient Rayleigh scattering plate according to the first embodiment of this utility model;

[0032] Figure 4 This is a color temperature change curve of plate No. 1 in the first embodiment of this utility model as a function of distance from the light source;

[0033] Figure 5 This is a color temperature change curve of plate No. 2 in the first embodiment of this utility model as a function of distance from the light source;

[0034] Figure 6 This is a color temperature change curve of plate No. 3 in the first embodiment of this utility model as a function of distance from the light source;

[0035] Figure 7 This is a schematic diagram of another embodiment of the gradient Rayleigh scattering plate of this utility model;

[0036] Figure 8 This is a schematic diagram of an embodiment of a gradient Rayleigh scattering module according to the present invention;

[0037] Figure 9 This is a graph showing the relationship between the light-emitting angle of the reflector cup and the distance between the light source and the light guide plate in the third embodiment of this utility model.

[0038] Figure 10 This is a schematic diagram of another embodiment of the gradient Rayleigh scattering module of this utility model;

[0039] Figure 11 This is a structural schematic diagram of the junction of the first region and the second region in an embodiment of the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings. It is hereby declared that the terms "up," "down," "left," "right," "front," "back," "inner," and "outer," etc., appearing or about to appear in this document, are based solely on the accompanying drawings and are not intended to specifically limit this utility model.

[0041] Example 1

[0042] like Figure 1 and Figure 2 As shown, the first embodiment of this utility model provides a gradient Rayleigh scattering plate, including a light guide plate 100, in which first light scattering particles 3 and second light scattering particles 4 are dispersed. The diameter of the first light scattering particles 3 is 10-100nm, and the diameter of the second light scattering particles 4 is 10-100μm.

[0043] The first light-scattering particle 3 should have light-scattering function. Preferably, the first light-scattering particle 3 is titanium dioxide, and the second light-scattering particle 4 is organosilicon microspheres. The particle size of the first light-scattering particle 3 is 30-60 nm, and the particle size of the second light-scattering particle 4 is 20-60 μm.

[0044] When light enters from the side of the light guide plate (preferably a light source with a color temperature >5000K to provide sufficient blue light for scattering), a large amount of light comes into contact with the first light scattering particles 3. Because the first light scattering particles 3 have a small diameter, they match the wavelength of blue light and strongly scatter it, creating a blue sky effect. From near the incident point to far away, the blue light is gradually scattered and weakened, and the remaining unscattered light contains more red light, coming into contact with the second light scattering particles 4 in areas far from the incident point. Because the second light scattering particles 4 have a larger diameter, they match the wavelength of red light, reducing blue light scattering and allowing more red light to pass through, creating a red sunset effect. The combination of these two, along with the angle of the incident light (e.g., setting the incident light to parallel light), allows light of different wavelengths to emerge from different positions on the light guide plate, creating a sunset sky effect with a gradual transition. Figure 2 This demonstrates the realistic light effect of this gradient Rayleigh diffuser.

[0045] like Figure 3 As shown in the figure, the horizontal axis of this curve represents the color temperature of the blue sky, and the vertical axis represents the color temperature of the sunset. The points on the curve represent the maximum and minimum color temperatures of a piece of material. The equation of the curve is: y = 4211*sin(0.0005568*x+15), where x is the color temperature of the blue sky and y is the color temperature of the sunset.

[0046] The following are three examples of sheet materials that conform to the cubic function y = ax 3 +bx 2 +cx+d;

[0047] Board example 1: Figure 4 This demonstrates the color temperature change on panel 1 as the distance from the light source changes, as measured. The origin (0) indicates that the distance between the gradient Rayleigh diffuser and the light source is 0. The curve equation is: y = --0.000951*x 3 +0.5586*x 2 -120.3*x+13440, where x is the distance from the LED bead and y is the color temperature.

[0048] Board example 2: Figure 5 This demonstrates the color temperature change on panel 1 as the distance from the light source varies, as measured. The origin (0) indicates that the distance between the gradient Rayleigh diffuser and the light source is 0. The curve equation is: y = --0.001272*x 3 +0.6493*x2 -112*x+11340, where x is the distance from the LED bead and y is the color temperature.

[0049] Board example 3: Figure 6 This demonstrates the color temperature change on panel 1 as the distance from the light source changes, as measured. The origin (0) indicates that the distance between the gradient Rayleigh diffuser and the light source is 0. The curve equation is: y = --0.0002729*x 3 +0.2167*x 2 -66.03*x+11240, where x is the distance from the LED bead and y is the color temperature.

[0050] Example 2

[0051] like Figure 7 and Figure 8 As shown, the second embodiment of this utility model provides a gradient Rayleigh scattering plate, including a light guide plate 100. The light guide plate 100 is configured with a first region 1 and a second region 2. The first region 1 contains first light scattering particles 3, and the second region 2 contains second light scattering particles 4. The diameter of the first light scattering particles 3 is smaller than the diameter of the second light scattering particles 4. The first region 1 and the second region 2 are located in different height layers of the gradient Rayleigh scattering plate. The first light scattering particles 3 should have light scattering function. Preferably, the first light scattering particles 3 are titanium dioxide, and the second light scattering particles 4 are organosilicon microspheres. The particle size of the first light scattering particles 3 is 30-60 nm, and the particle size of the second light scattering particles 4 is 20-60 μm.

[0052] By setting a first region 1 and a second region 2 at predetermined positions within the light guide plate 100, the first region 1 and the second region 2 are located at different height layers within the gradient Rayleigh scattering plate. The first region 1 is close to the light-emitting surface of the light guide plate 100, and the second region 2 is far from the light-emitting surface of the light guide plate 100. Simultaneously, the first region 1 contains a first light-scattering particle 3, and the second region 2 contains a second light-scattering particle 4. The diameter of the first light-scattering particle 3 is smaller than the diameter of the second light-scattering particle 4. Because the diameter of the first light-scattering particle 3 is smaller, it can match the blue light wavelength and strongly scatter blue light, creating a blue sky effect. The diameter of the second light-scattering particle 4 is larger, which can match the red light wavelength, reducing blue light scattering and allowing more red light to pass through, creating a red sunset effect. The combination of these two, along with the angle of the incident light, allows light to exit from different positions in the first region 1 and the second region 2, creating a sunset sky effect with a gradual transition.

[0053] In order to improve the scattering efficiency of the first light scattering particle 3 in the first region 1 for blue light, and to improve the scattering and light transmission ability of the second light scattering particle 4 in the second region 2 for red light, the density of the first light scattering particle 3 in the first region 1 is greater than the density of the second light scattering particle 4 in the second region 2.

[0054] Preferably, the color temperature difference between the first region 1 and the second region 2 can be increased by controlling the ratio of the thickness of the height layer containing the first region 1 to the thickness of the height layer containing the second region 2. In this embodiment, the thickness of the height layer containing the first region 1 is more than twice that of the height layer containing the second region 2; the thickness of the height layer containing the first region 1 is 450-550 μm, preferably 500 μm, and the thickness of the height layer containing the second region 2 is 150-250 μm, preferably 200 μm. Using the above thickness ratio, it can be matched with the incident angle of the corresponding light source, causing some light to be reflected multiple times on the upper and lower surfaces of the first region 1, thus scattering multiple times within the first region 1 and increasing the intensity of the blue light formed; some light passes directly through the second region 2, forming red light in a predetermined area, and the two combine to form a spatial color partition.

[0055] To control the proportion and gradation of color zones, the surface of the second region 2 can also be provided with a frosted surface 5 or a microlens array. The frosted surface 5 or microlens array allows for diffuse reflection of light emitted from the second region 2. By controlling the position of the frosted surface or microlens array, the transition between blue and red light can be made smoother, and the range of red light can be controlled to form a reasonable blue-red ratio, better simulating the effect of a blue sky and sunset. The color temperature of the sunset region is between 1500K and 4500K, and the color temperature of the blue sky region is between 4500K and 10000K.

[0056] Example 3

[0057] Combination Figure 8 As shown, this embodiment provides a gradient Rayleigh scattering module, including the gradient Rayleigh scattering plate proposed in the second embodiment. A light source 6 is provided on one side of the gradient Rayleigh scattering plate, and the light emitted by the light source 6 enters from the side of the gradient Rayleigh scattering plate. The light source 6 is a cool color temperature light source, such as an LED with a color temperature >5000K, providing sufficient blue light as the scattering basis.

[0058] The light source 6 is housed within a reflector cup 7, which is tilted to allow the light source 6 to emit light at a predetermined angle to the gradient Rayleigh diffuser plate. Specifically, the reflector cup 7 has an asymmetrical design, with the lower reflective surface 71 extending further outward than the upper reflective surface 72, allowing more light to enter the first region 1. The light emitted from the light source 6 enters the first region 1 at an angle, and combined with the greater thickness of the first region 1, this increases the number of scattering events, enhancing the blue light effect. Since the second region 2 is located below the first region 1, with the tilt angle of the light source 6, the light exits from a greater distance from the light source 6 after passing through the second region 2, thus creating a red sunset effect at a location far from the light source 6. The color temperature of the sunset region is between 1500K and 4500K, and the color temperature of the blue sky region is between 4500K and 10000K. The reflector cup structure achieves an upward polarization effect with a polarization angle of 1 to 20 degrees; the relationship between the reflector cup's emission angle and the distance between the light source and the light guide plate is as follows... Figure 9 As shown: y = -5.493x 2 -50.2*x+181.1, where y is the light emission angle of the reflector cup and x is the distance between the light source and the light guide plate.

[0059] To improve the color zoning effect, a light guide structure is provided at a predetermined position between the first region 1 and the second region 2. The light guide structure can be a microchannel or a first grating structure 8. By setting the light guide structure, the light entering the first region 1 from the second region 2 can be controlled, thereby controlling the distribution of red light against a blue background. Preferably, this embodiment uses a first grating structure 8, and the opening size of the first grating structure 8 gradually increases from the side of the light source 6 towards the direction away from the light source 6, so that the light entering the first region 1 from the second region 2 gradually increases, thereby forming a uniform blue-red transition zone. The grating opening size changes linearly, w min This represents the minimum opening size on the left side (y = 0). max Let w(y) be the maximum opening size on the right side (y = H). Then the formula for the opening size is: w(y) = w min +(w max -w min )y / H.

[0060] Where: w(y) is the aperture size at position y, where y is the abscissa measured from the left side of the grating (0≤y≤H). H is the total width of the grating. min and w max These are design parameters that must satisfy w min <w max (to ensure that the opening size increases from left to right).

[0061] Formula for the distance from the center of the aperture to the edge of the grating:

[0062] Distance to the left edge: dleft (y)=y;d right (y)=Hy

[0063] Here, y is the x-coordinate of the center of the opening (0 ≤ y ≤ H). d left (y) and d right (y) are all functions of y, representing the Euclidean distance from the center point of the opening to the corresponding boundary.

[0064] Example 4

[0065] like Figure 10 As shown, the first embodiment of this utility model provides another gradient Rayleigh scattering plate, including a light guide plate 100. The light guide plate 100 is configured with a first region 1 and a second region 2. The first region 1 contains first light scattering particles 3, and the second region 2 contains second light scattering particles 4. The diameter of the first light scattering particles 3 is smaller than the diameter of the second light scattering particles 4. The first region 1 and the second region 2 are located at different positions on the same plane of the gradient Rayleigh scattering plate. The first light scattering particles 3 should have light scattering function. Preferably, the first light scattering particles 3 are titanium dioxide, and the second light scattering particles 4 are organosilicon microspheres. The particle size of the first light scattering particles 3 is 30-60 nm, and the particle size of the second light scattering particles 4 is 20-60 μm.

[0066] By setting a first region 1 and a second region 2 at predetermined positions within the light guide plate 100, the first region 1 and the second region 2 are located at different positions on the same plane of the gradient Rayleigh diffuser plate. The first region 1 is closer to the light source 6, and the second region 2 is farther from the light source 6. Simultaneously, the first region 1 contains a first light-scattering particle 3, and the second region 2 contains a second light-scattering particle 4. The diameter of the first light-scattering particle 3 is smaller than the diameter of the second light-scattering particle 4. Because the diameter of the first light-scattering particle 3 is smaller, it can match the blue light wavelength and strongly scatter blue light, creating a blue sky effect. The diameter of the second light-scattering particle 4 is larger, and it can match the red light wavelength, reducing blue light scattering and allowing more red light to pass through, creating a red sunset effect. The combination of these two allows light to exit from the first region 1 and the second region 2, forming a sunset sky effect with a gradual transition.

[0067] To improve the scattering efficiency of the first light-scattering particle 3 for blue light in the first region 1, and to improve the scattering and transmission capabilities of the second light-scattering particle 4 for red light in the second region 2, the density of the first light-scattering particle 3 in the first region 1 is greater than the density of the second light-scattering particle 4 in the second region 2. The color temperature of the sunset region is between 1500K and 4500K, and the color temperature of the blue sky region is between 4500K and 10000K.

[0068] Example 5

[0069] Combination Figure 11 As shown, this embodiment provides another graded Rayleigh scattering module, including the graded Rayleigh scattering plate proposed in the fourth embodiment. A light source 6 is provided on one side of the graded Rayleigh scattering plate, and the light emitted by the light source 6 enters from the side of the graded Rayleigh scattering plate. The light source 6 is a cool color temperature light source 6, such as an LED with a color temperature >5000K, providing sufficient blue light as the scattering basis.

[0070] The light source 6 is disposed in a reflector cup, and both the light source 6 and the reflector cup face the side of the gradient Rayleigh scattering plate. The light source 6 emits light parallel to the gradient Rayleigh scattering plate, so that the emitted light enters the gradient Rayleigh scattering plate parallel to it. Specifically, the light enters the light guide plate 100 parallel to it and undergoes multiple scatterings in the first region 1, thereby forming strong blue light that is emitted outward. Part of the light enters the second region 2, scattering red light and emitting red light outward from the second region 2.

[0071] To improve the color zoning effect, a light guide structure is provided at the junction of the first region 1 and the second region 2. The light guide structure can be a microchannel or a second grating structure 9. By setting the light guide structure, the light entering the second region 2 from the first region 1 can be controlled, thereby controlling the intensity and distribution of blue light within the red light region. Preferably, this embodiment uses a second grating structure 9, and the opening size of the second grating structure 9 gradually increases from top to bottom, so that the amount of light entering the second region 2 from the first region 1 from top to bottom gradually increases. Thus, in different layers from top to bottom, the upper layer emits weaker blue light into the second region 2, which gradually turns into red light under the action of the second light scattering particles 4 in the second region 2; the lower layer emits stronger light into the second region 2, which, after undergoing scattering over a longer distance within the second region 2, forms a stronger and purer red light at the far end of the second region 2.

[0072] The grating aperture size varies linearly, w min This represents the minimum opening size at the top (y=0). max Let w be the maximum opening size at the bottom (y = H). Then the formula for the opening size is: w(y) = w min +(w max -w min )y / H.

[0073] Where: w(y) is the aperture size at position y, where y is the vertical coordinate measured from the top of the grating (0≤y≤H). H is the total height of the grating. min and w max These are design parameters that must satisfy w min <wmax (to ensure that the opening size increases from top to bottom).

[0074] Formula for the distance from the center of the aperture to the edge of the grating:

[0075] Distance to the top edge (top): d top (y)=y;d bottom (y)=Hy

[0076] Here, y is the vertical coordinate of the center of the opening (0 ≤ y ≤ H). top (y) and d bottom (y) are all functions of y, representing the Euclidean distance from the center point of the opening to the corresponding boundary.

[0077] The lighting fixtures used in this technology include, but are not limited to, sizes of 300mm*300mm, 300mm*600mm, 600mm*600mm, and 600mm*1200mm.

[0078] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A gradient Rayleigh scattering plate, characterized in that, It includes a light guide plate, in which first light scattering particles and second light scattering particles are dispersed. The diameter of the first light scattering particles is 10-100 nm, and the diameter of the second light scattering particles is 10-100 μm.

2. The gradient Rayleigh scattering plate as described in claim 1, characterized in that, The light guide plate is configured to have a first region and a second region, wherein a first light-scattering particle is disposed in the first region and a second light-scattering particle is disposed in the second region. The first region and the second region are located in different height layers of the gradient Rayleigh scattering plate, or the first region and the second region are located at different positions on the same plane of the gradient Rayleigh scattering plate.

3. The gradient Rayleigh scattering plate as described in claim 2, characterized in that, The density of the first light-scattering particles in the first region is greater than the density of the second light-scattering particles in the second region.

4. The gradient Rayleigh scattering plate as described in claim 2, characterized in that, When the first region and the second region are located in different height layers of the gradient Rayleigh scattering plate, the thickness of the height layer where the first region is located is greater than twice that of the height layer where the second region is located.

5. The gradient Rayleigh scattering plate as described in any one of claims 2-4, characterized in that, The surface of the second region is provided with a frosted surface or a microlens array.

6. The gradient Rayleigh scattering plate as described in claim 4, characterized in that, The thickness of the first region is 450-550 μm, and the thickness of the second region is 150-250 μm.

7. The gradient Rayleigh scattering plate as described in any one of claims 2-4, characterized in that, The first light-scattering particle is titanium dioxide, and the second light-scattering particle is organosilicon microspheres.

8. A gradient Rayleigh scattering module, characterized in that, Includes a gradient Rayleigh diffuser as described in any one of claims 1-7, wherein a light source is provided on one side of the gradient Rayleigh diffuser, and light emitted from the light source enters from the side of the gradient Rayleigh diffuser.

9. The gradient Rayleigh scattering module as described in claim 8, characterized in that, When the first region and the second region are located in different height layers of the gradient Rayleigh scattering plate, the light source is placed in the reflector cup, and the reflector cup is tilted so that the light source emits light at a predetermined angle to the gradient Rayleigh scattering plate. When the first region and the second region are located at different positions on the same plane of the gradient Rayleigh scattering plate, the light source faces the side of the gradient Rayleigh scattering plate, so that the emitted light enters the gradient Rayleigh scattering plate in parallel.

10. The gradient Rayleigh scattering module as described in claim 9, characterized in that, A light guide structure is provided at a predetermined position between the first region and the second region; the light guide structure is a first grating, which is horizontally arranged and the opening size gradually increases from the side closer to the light source to the side farther away from the light source; or the light guide structure is a second grating, which is vertically arranged and the opening size gradually increases from top to bottom.

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