CN115542653A - Fresnel projection screen and manufacturing method thereof - Google Patents

Abstract

The application discloses a Fresnel projection screen and a manufacturing method thereof, relates to the technical field of projection display, and is used for solving the problem that the contrast of the projection screen has large difference under the environments of different light conditions. The Fresnel projection screen comprises a reflecting layer, a Fresnel lens layer, a functional layer and a photochromic material. The reflection stratum is used for the reflection ray, and the fresnel lens layer sets up with the reflection stratum is range upon range of, and the functional layer is range upon range of to be set up in fresnel lens layer one side of keeping away from the reflection stratum. The photochromic material is distributed in at least one of the reflecting layer, the Fresnel lens layer and the functional layer. Photochromic materials are used to develop and fade under changes in light conditions. The Fresnel projection screen is used for displaying a projection picture.

Description

Fresnel projection screen and manufacturing method thereof

Technical Field

The application relates to the technical field of projection display, in particular to a Fresnel projection screen and a manufacturing method thereof.

Background

In the field of projection display technology, projectors are commonly used in conjunction with projection screens. The light emitted by the projector is projected onto the projection screen, and reaches the eyes of the audience after being reflected by the projection screen, so that the audience can watch the image formed by the light on the surface of the projection screen.

However, the existing projection screen has a certain ability of resisting ambient light, and cannot adapt to environments with different light intensities, and the contrast of a projection picture of the projection screen has a large difference under the environments with different light conditions.

Disclosure of Invention

The application provides a Fresnel projection screen and a manufacturing method thereof, which are used for solving the problem that the contrast of the projection screen has larger difference under the environments of different light conditions.

In order to achieve the purpose, the technical scheme is as follows:

in one aspect, an embodiment of the present application provides a fresnel projection screen, which includes a reflective layer, a fresnel lens layer, a functional layer, and a photochromic material. The reflection stratum is used for the reflection ray, and the fresnel lens layer sets up with the reflection stratum is range upon range of, and the functional layer is range upon range of to be set up in the fresnel lens layer and is kept away from the one side of reflection stratum. The photochromic material is distributed in at least one of the reflecting layer, the Fresnel lens layer and the functional layer. Photochromic materials are used to develop and fade under changes in light conditions.

According to the Fresnel projection screen provided by the embodiment of the application, light rays projected by the projector reach the reflecting layer after passing through the functional layer and the Fresnel lens layer. After being reflected by the reflecting layer, the light rays are emitted to the audience from the side where the functional layer is located, and the audience can watch images on the Fresnel projection screen. When passing through the Fresnel microstructure, the external ambient light is reflected to a region which is not watched by human eyes, so that the Fresnel projection screen has certain ambient light resistance.

The photochromic material is distributed in at least one of the reflecting layer, the Fresnel lens layer and the functional layer. Under the stronger environment of ambient light, photochromic material receives the back of shining of ambient light, and the colour can become darker, and when external ambient light passed through fresnel projection screen's inside, the absorptive proportion of ambient light was also more, and fresnel projection screen's anti ambient light's ability is stronger, and the contrast is higher. Under the environment with weak ambient light, the photochromic material has a lighter color and can sufficiently absorb the ambient light with weak light, and the Fresnel projection screen has better ambient light resistance under the condition with weak ambient light and can keep higher contrast.

In some embodiments, the fresnel projection screen further comprises a dark dye. The dark dye is distributed in at least one of the reflective layer, the Fresnel lens layer and the functional layer.

In some embodiments, the dark dye is distributed within at least one of the reflective layer, the fresnel lens layer, and the functional layer having the photochromic material distributed therein.

In some embodiments, in the reflective layer, fresnel lens layer, or functional layer having a dark dye and a photochromic material distributed therein, the ratio of the mass of the dark dye to the mass of the photochromic material is greater than or equal to 1:1.

in some embodiments, the dark dye and the photochromic material are distributed within different ones of the reflective layer, the fresnel lens layer, and the reflective layer.

In some embodiments, the photochromic material comprises at least one of a spiropyran-based photochromic material, a diarylethene-based photochromic material, an azobenzene-based photochromic material, a fulgide, a spirooxazine, a transition metal oxide-based photochromic material, a metal halide, and a rare earth complex.

In some embodiments, the fresnel projection screen further comprises guard particles. The protective particles are distributed in at least one of the reflecting layer, the Fresnel lens layer and the functional layer. The interior of the protective particles is hollow, forming a cavity. At least a portion of the photochromic material is disposed within the cavity of the protective particle.

In some embodiments, the photochromic material is in the form of particles, and the particle size of the photochromic material is between 5nm and 20um.

In another aspect, an embodiment of the present application provides a method for manufacturing any one of the fresnel projection screens described above, where the method includes: manufacturing a functional layer; manufacturing a Fresnel lens layer on one side of the functional layer; and manufacturing a reflecting layer on one side of the Fresnel lens layer far away from the functional layer.

In some embodiments, the method further comprises: blending the photochromic material and the substrate material to form a mixed material; the blended material is stirred to uniformly distribute the photochromic material over the base material.

The technical effect of the manufacturing method of the Fresnel projection screen is the same as that of the Fresnel projection screen, and the details are not repeated here.

Drawings

Fig. 1 is a schematic view illustrating a usage state of a projection apparatus according to an embodiment of the present disclosure;

fig. 2 is a schematic overall structure diagram of a fresnel projection screen according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of another fresnel projection screen provided in this embodiment of the present application in an ultraviolet light environment;

FIG. 4 is a schematic structural diagram of the Fresnel projection screen shown in FIG. 3 under an environment without UV irradiation or with weak UV light;

fig. 5 is a schematic structural diagram of another fresnel projection screen provided in an embodiment of the present application;

FIG. 6 is a schematic structural diagram of an overall structure of a functional layer distributed with photochromic materials and dark dyes provided by an embodiment of the present application;

fig. 7 is a schematic structural diagram of a functional layer with protective particles distributed therein according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a surface layer provided in an embodiment of the present disclosure;

FIG. 9 is a schematic view of another structure of a surface layer provided in an embodiment of the present application

FIG. 10 is a schematic structural view of a microlens of the surface layer shown in FIG. 9 after being subjected to an atomization treatment;

fig. 11 is a schematic structural diagram of a reflective layer provided in an embodiment of the present application;

FIG. 12 is a schematic structural diagram of another reflective layer provided in the embodiments of the present application;

fig. 13 is a first flowchart illustrating a method for manufacturing a fresnel projection screen according to an embodiment of the present application;

fig. 14 is a second flowchart illustrating a method for manufacturing a fresnel projection screen according to an embodiment of the present application;

fig. 15 is a third flowchart of a fresnel projection screen manufacturing method according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms, "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "center", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the present application.

In the embodiments of the present application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one of 8230, and" comprising 8230does not exclude the presence of additional like elements in a process, method, article, or apparatus comprising the element.

In the embodiments of the present application, the words "exemplary" or "such as" are used herein to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "such as" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

In daily life, projection screens are generally required to be used in different environments. However, the resistance of the projection screen to ambient light is generally constant and cannot be changed according to the change of ambient light. Therefore, in some environments with strong lighting, the projection screen is easily affected by external ambient light, so that the contrast of a projection picture on the projection screen is low, the projection picture has the problems of insufficient saturation and white display picture.

Based on this, an embodiment of the present application provides a projection apparatus, and referring to fig. 1, fig. 1 is a schematic view of a usage state of the projection apparatus 100 provided in the embodiment of the present application. Projection device 100 may include a fresnel projection screen 1 and a projector 2. The projector 2 is configured to project light toward the fresnel projection screen 1, and the fresnel projection screen 1 is configured to receive the light projected by the projector 2 and display a picture.

In use of the projection apparatus 100, the projector 2 may be placed beneath the front of the fresnel projection screen 1, with the viewer 3 positioned in front of the fresnel projection screen 1 and looking at the fresnel projection screen 1. The incident light 21 that the projector 2 sent shines fresnel projection screen 1, and the emergent light 22 that finally forms after incident light 21 passes through fresnel projection screen 1's reflection shines audience 3, forms images in fresnel projection screen 1 simultaneously.

The projector 2 shown in fig. 1 may include a laser, which may be one of a monochromatic laser, a dichroic laser, and a tristimulus laser. The three-color laser can emit blue laser, red laser and green laser. The wavelength of blue laser light emitted from the laser may be set to a range of 430nm-460nm, the wavelength of green laser light emitted may be set to a range of 500nm-540nm, and the wavelength of red laser light emitted may be set to a range of 610nm-650nm.

Since the three-color laser has the advantages of color fidelity and high color gamut, the laser in the projector 2 provided by the embodiment of the present application can be selected from the three-color laser. Of course, the laser in the projector 2 provided in the embodiment of the present application may also be a monochromatic laser or a dichroic laser.

In the technical field of projection display, especially in the field of ultrashort-focus laser projection display, in order to achieve better brightness and display effect, a projector can be matched with a projection screen with a Fresnel microstructure. The following illustrates a specific structure of the projection screen having the fresnel microstructure provided in the embodiment of the present application.

As shown in fig. 2, fig. 2 is a schematic view of an overall structure of a fresnel projection screen 1 provided in this embodiment of the present application, and the fresnel projection screen 1 may include a reflection layer 11, a fresnel lens layer 12, and a functional layer 13.

The reflective layer 11 is used to reflect light, and as shown in fig. 2, the light projected by the projector 2 reaches the reflective layer 11 after passing through the functional layer 13 and the fresnel lens layer 12. After being reflected by the reflective layer 11, the light is emitted to the viewer 3 from the side where the functional layer 13 is located, and the viewer 3 can view an image on the fresnel projection screen 1.

The fresnel lens layer 12 is laminated to the reflective layer 11. The surface of the fresnel lens layer 12 on the side close to the reflection layer 11 has fresnel microstructures. When passing through the fresnel microstructure, external ambient light is reflected to a non-human eye viewing area, so that the fresnel projection screen 1 has a certain ability of resisting ambient light.

In addition, the Fresnel microstructure can also play a role in converging light, so that the gain of the Fresnel projection screen 1 is higher. The viewer can see an image with high brightness at a position facing the fresnel projection screen 1. As shown in fig. 2, the fresnel microstructure may include a plurality of annular band structures 121 concentrically arranged, and an included angle θ is formed on a cross section of each annular band structure 121, where the angle θ may be 5 ° to 85 °. Illustratively, the angle θ may be 5 °, 30 ° or 85 °, which may be set according to actual requirements and is not further limited herein.

The functional layer 13 is stacked on the fresnel lens layer 12 on the side away from the reflective layer 11. The functional layer 13 may be used to improve performance of the fresnel projection screen 1, and according to different structures of the functional layer 13, relevant performance of the fresnel projection screen 1 may be correspondingly improved. The structure of the functional layer 13 will be further described later, and will not be further described here.

Referring to fig. 2, in order to improve the adaptability of the fresnel projection screen 1 to different ambient light, the fresnel projection screen 1 may further include a photochromic material (not shown in fig. 2). The photochromic material is distributed in at least one of the reflective layer 11, the fresnel lens layer 12 and the functional layer 13. Photochromic materials can be used to develop and fade under changes in light conditions.

Thus, as shown in fig. 3, fig. 3 is a schematic structural diagram of another fresnel projection screen 1 provided in this embodiment of the present application under an ultraviolet light environment, and in an environment with strong ambient light, after a photochromic material (not shown in the figure) is irradiated by ambient light, the color of the photochromic material becomes darker, when the external ambient light passes through the interior of the fresnel projection screen, the ratio of the ambient light to be absorbed is also higher, the ability of the fresnel projection screen 1 to resist the ambient light is stronger, and the contrast is higher. As shown in fig. 4, fig. 4 is a schematic structural diagram of the fresnel projection screen 1 shown in fig. 3 in an environment without ultraviolet irradiation or with weak ultraviolet, where in the environment with weak ambient light, the color of the photochromic material (not shown in the figure) is light enough to absorb the ambient light with weak light, and the fresnel projection screen 1 also has good ambient light resistance under the condition with weak ambient light, and can maintain high contrast.

Meanwhile, under the condition that light is weak, the photochromic material is light in color, so that the absorption of the Fresnel projection screen on the light projected by the projector can be reduced, the light projected by the projector can be fully reflected to the eyes of audiences, the utilization rate of the light is ensured, and the loss of the light is reduced.

It will be appreciated that the photochromic material may be distributed at different locations on the fresnel projection screen 1. Illustratively, as shown in fig. 2, the photochromic material may be distributed within the functional layer 13. At this moment, when external ambient light passes through the interior of the fresnel projection screen 1, the external ambient light passes through the functional layer 13 with the photochromic material distributed, so that the external ambient light can be fully absorbed by the photochromic material, and the effect of the fresnel projection screen on resisting the ambient light is improved.

Of course, as shown in fig. 5, fig. 5 is a schematic structural diagram of another fresnel projection screen 1 provided in this embodiment of the present application, and the photochromic material may also be distributed in the reflective layer 11. At this time, since the light passes through the primary reflection layer 11, it is reduced that the light projected by the projector 2 is absorbed by the photochromic material, and the utilization rate of the light projected by the projector 2 is improved. Alternatively, the photochromic material may be distributed within the fresnel lens layer 12. The location of the photochromic material can be selected according to the actual situation, and will not be further described here.

It is understood that the photochromic material may be distributed in one or more of the functional layer 13, the fresnel lens layer 12 and the reflective layer 11. When photochromic material distributes in the multilayer in functional layer 13, fresnel lens layer 12 and reflection stratum 11, light can be absorbed many times when the inside of fresnel projection screen 1, and then makes fresnel projection screen 1's anti ambient light's ability promote.

Of course, the photochromic material may also be distributed in one of the functional layer 13, the fresnel lens layer 12 and the reflective layer 11, so that the fresnel projection screen 1 has a better ambient light resistance, which may be selected according to actual conditions, and is not further limited herein.

In some embodiments, the photochromic material may include at least one of spiropyran-based photochromic materials, diarylethene-based photochromic materials, azobenzene-based photochromic materials, fulgide, spirooxazine, transition metal oxide-based photochromic materials, metal halides, and rare earth complexes.

The photochromic material has better photochromic performance and can show light color or transparent color under the condition of no ultraviolet irradiation. Light can better see through above-mentioned photochromic material, can guarantee the utilization ratio of the light that the projector throws. When above-mentioned photochromic material receives ultraviolet irradiation, the colour can deepen gradually, and the ability reinforcing of absorbed light, and then promotes the ability of fresnel projection screen anti ambient light, promotes the contrast of projection picture.

From this, when fresnel projection screen uses under the higher condition of daytime sunshine intensity, above-mentioned photochromic material under the shining of ultraviolet ray light, the colour becomes dark gradually to make fresnel projection screen anti ambient light's effect reinforcing, guarantee that fresnel projection screen has higher contrast, promote the display effect of projection picture.

In order to allow better dispersion of the photochromic material within the reflective layer 11, the fresnel lens layer 12 and the functional layer 13. In some embodiments, the photochromic material may be in the form of particles, and the particle size of the photochromic material may be 5nm to 20um. When the particle size of the photochromic material is in the range, the photochromic material is not easy to agglomerate and is dispersed uniformly. When the particle size of the photochromic material is excessively large, the photochromic material is easily agglomerated, thereby making the dispersibility poor. When the particle size of the photochromic material is too small, the ability of the photochromic material to absorb ambient light may be low.

In some embodiments, the fresnel projection screen 1 may also include a dark dye. The dark dye is distributed in at least one of the reflective layer 11, the fresnel lens layer 12 and the functional layer 13. Dark color dye can also absorb external ambient light, and the effect of improving the contrast of the Fresnel projection screen 1 is achieved.

Because the interior of the fresnel projection screen 1 is simultaneously distributed with the dark dye and the photochromic material, the dark dye and the photochromic material can jointly absorb the ambient light to further improve the contrast of the fresnel projection screen. In the case of high solar intensity, dark dyes can absorb a portion of the ambient light. Meanwhile, the color of the photochromic material can be changed along with the irradiation of light, and the photochromic material can also absorb a part of ambient light, so that the anti-ambient light capability of the Fresnel projection screen is greatly improved.

As can be seen from the above, the photochromic material can gradually darken in color under the irradiation of ultraviolet light. Therefore, the sunlight can gradually change the color of the photochromic material, so that the fresnel projection screen 1 has better capability of resisting the ambient light.

It is known that the ultraviolet content in the light emitted by indoor lights is lower than that in solar radiation. Thus, when the fresnel projection screen 1 is used in an indoor ambient light environment, the photochromic material is less capable of absorbing ambient light. At this moment, the dark dye can better absorb the external ambient light, so that the fresnel projection screen 1 has better ambient light resistance under the irradiation of light and higher contrast.

In addition, the photochromic material has certain instability and is easy to react with oxygen, moisture and the like, so that the number of discoloration cycles of the photochromic material is reduced. By providing a dark dye, the fresnel projection screen 1 can be prevented from experiencing a decrease in the ambient light resistance caused by failure of the photochromic material.

In some embodiments, as shown in fig. 6, fig. 6 is a schematic view illustrating an overall structure of the functional layer 13 distributed with the photochromic material 14 and the dark color dye 15 according to an embodiment of the present disclosure, the dark color dye 15 may be distributed in at least one of the reflective layer 11 (fig. 4) distributed with the photochromic material, the fresnel lens layer 12 (fig. 4) and the functional layer 13, that is, the dark color dye 15 and the photochromic material 14 may be distributed in the same layer.

Thus, as shown in FIG. 6, the dark dye 15 and the photochromic material 14 are distributed in the same layer. Thus, when the photochromic material 14 and the dark dye 15 are arranged in only one layer, the absorption of the Fresnel projection screen 1 (figure 2) to the light projected by the projector 2 (figure 2) can be reduced, and the utilization efficiency of the light can be improved.

In some embodiments, in the reflective layer 11, the fresnel lens layer 12, or the functional layer 13 in which the dark dye 15 and the photochromic material 14 are distributed, the ratio of the mass of the dark dye 15 to the mass of the photochromic material 14 is greater than or equal to 1:1.

thus, the fresnel projection screen 1 has a high and constant ability to absorb ambient light due to the large fraction of dark dye 15, so that the contrast of the fresnel projection screen 1 is not too low. Meanwhile, the photochromic material 14 can be used as a supplement to further absorb the ambient light under the strong illumination condition, so that the ambient light resistance of the Fresnel projection screen 1 is improved, and the contrast of the Fresnel projection screen 1 is ensured.

When the mass ratio of the photochromic material is less than 1: at 1, the proportion occupied by the photochromic material 14 is large. Thus, when the photochromic material 14 fails, the ability of the fresnel projection screen 1 to absorb ambient light is easily reduced, which results in a significant reduction in contrast of the phenanthrene display image and affects the projection effect.

It will be appreciated that the ratio of the mass of dark dye 15 to the mass of photochromic material 14 may be chosen according to the actual situation. Illustratively, the mass ratio of dark dye 15 to photochromic material 14 may be 1:1 or 2:1.

in the reflective layer 11, the fresnel lens layer 12, and the functional layer 13, in which the dark dye 15 is distributed, the mass ratio of the dark dye 15 is 3% or less. When the mass fraction of the dark dye 15 is too large, the dark dye 15 will also absorb more of the light projected by the projector. When the mass ratio of the dark dye 15 is too small, it cannot sufficiently absorb the external ambient light, and the ambient light resistance is weak.

It will be appreciated that if the reflective layer 11, the fresnel lens layer 12 and the functional layer 13 have both a dark dye 15 and a photochromic material 14 distributed therein. The mass percentage of the photochromic material 14 should be less than 3%.

In other embodiments, the dark dye 15 and the photochromic material 14 may also be distributed within different ones of the reflective layer 11, the fresnel lens layer 12 and the functional layer 13.

It will be appreciated that the photochromic material 14 and the dark dye 15 are chosen differently and may react with each other and not be stable. In this way, because the dark dye 15 and the photochromic material 14 are located in different layers of the fresnel projection screen 1, the dark dye 15 and the photochromic material 14 can be prevented from interfering with each other, so that the photochromic material 14 and the dark dye 15 can be stably dispersed within the fresnel projection screen 1.

Illustratively, the dark dye 15 may be distributed within the reflective layer 11 and the photochromic material 14 may be distributed within the functional layer 13. Thus, in the case of weak ambient light, the projector 2 absorbs less light because the photochromic material 14 is lighter in color. Meanwhile, since the dark dye 15 is disposed in the reflective layer 11, the light projected by the projector 2 is absorbed only once by the dark dye 15, and the projector 2 is also absorbed by the colored dye by the amount. Thus, in the above-described manner, when the ambient light is weak, the utilization rate of the light projected by the projector 2 is high, and the luminance of the display screen is high.

As can be seen from the above, the photochromic material is liable to react with air, moisture, and the like, and the photochromic material fails. To this end, in some embodiments, as shown in fig. 7, fig. 7 is a schematic structural diagram of the functional layer 13 provided in this embodiment, when the protective particles 16 are distributed in the functional layer 13, the fresnel projection screen may further include the protective particles 16, and the protective particles 16 are distributed in at least one of the reflective layer 11 (fig. 5), the fresnel lens layer 12 (fig. 5), and the functional layer 13. The interior of the protective particles 16 is hollow, forming a cavity.

At least a portion of the photochromic material 14 is disposed within the cavity of the protective particle 16. Thus, the photochromic material 14 is located in the cavity of the protective particle 16, so that the photochromic material 14 can be prevented from contacting with the outside, and the stability of the photochromic material is ensured. It is understood that the protective particles 16 may be made of a transparent organic material to allow light to pass through the protective particles 16, ensuring the propagation of the light.

It is understood that the amount of the photochromic material 14 in the protective particles 16 shown in fig. 7 is only an example, and the distribution ratio of the first photochromic material 14 in each protective particle 16 can be set according to practical situations, and is not further limited herein.

Of course, the photochromic material 14 may be directly disposed in at least one of the reflective layer 11, the fresnel lens layer 12 and the functional layer 13, and when the reflective layer 11, the fresnel lens layer 12 and the functional layer 13 are manufactured, the photochromic material may be mixed with the base material for manufacturing the above structure to manufacture the reflective layer 11, the fresnel lens layer 12 or the functional layer 13 on which the photochromic material 14 is distributed.

In order to improve other performances of the projection screen, the fresnel projection screen 1 may have different functional layers 13, and the fresnel projection screen 1 with different structures provided in the embodiments of the present application is further described below with reference to the accompanying drawings.

As shown in fig. 2, in order to enlarge the viewing angle of the fresnel projection screen 1, in some embodiments, the functional layer 13 may include a diffusion layer 131, with diffusion particles 40 distributed within the diffusion layer 131. The light entering the fresnel projection screen 1 passes through the diffusion layer 131 and is diffused in all directions by the diffusion particles 40. Referring to fig. 3, a photochromic material (not shown) may be distributed in the diffusion layer 131.

The viewing angle of the fresnel projection screen 1 is increased due to the diffusion of the light. Meanwhile, the coherence of the diffused light rays is weak, the interference degree of the light rays on the surface of the Fresnel projection screen 1 is reduced, and the severity of speckles appearing on the surface of the Fresnel projection screen 1 is further weakened. The material of the diffusion particles 40 may be Polymethyl methacrylate (PMMA).

Of course, the photochromic material may also be provided in the other functional layers 13. As shown in fig. 2, in some embodiments, the functional layer 13 may further include a colored layer 132, and the colored layer 132 is located on a side of the fresnel lens layer 12 away from the reflective layer 11. A photochromic material (not shown in figure 2) is distributed within the functional layer 13. When passing through the coloring layer 132, the external ambient light is absorbed by the photochromic material in the coloring layer 132, so as to ensure the contrast of the fresnel projection screen 1.

With continued reference to fig. 2, in some embodiments, the functional layer 13 may further include a surface layer 133, the surface layer 133 may be a side of the diffusion layer 131 of the colored layer 132, and the surface layer 133 may be used to protect the fresnel projection screen 1.

Wherein the surface layer 133 may be made of different materials. For example, the surface layer 133 may be made of an ultra violet Rays (UV glue), and when the surface layer 133 is manufactured, the UV glue is coated on the surface of the coloring layer 132 on the side away from the diffusion layer 131, and then the UV glue is cured by a UV light source lamp, so that the surface layer 133 is manufactured. Of course, the surface layer 133 may be made of a hard material, for example, a methyl methacrylate-styrene copolymer (MS) material.

The surface layer 133 of the fresnel projection screen 1 may have different structures in order to achieve different functions. Several different surface layers provided by embodiments of the present application are exemplified below with reference to the accompanying drawings.

As shown in fig. 5, in some embodiments, the surface of the surface layer 133 on the side away from the fresnel lens layer 12 may be a frosted (mate) surface, which has a low light reflectivity. Therefore, when the light projected by the projector 2 reaches the surface, more light can enter the Fresnel projection screen 1 through the surface, so that the light projected by the projector 2 is not easy to form clear images at other places (such as a ceiling), and the viewing experience of the audience 3 is ensured.

The surface of the surface layer 133 away from the fresnel lens layer 12 may be treated by a sand blasting process to form an atomized surface, which is simple and convenient to operate and easy to implement. Meanwhile, the reflective layer 11 in the fresnel projection screen 1 shown in fig. 5 may have photochromic material distributed therein.

As shown in fig. 8, fig. 8 is a schematic structural diagram of a surface layer 133 according to an embodiment of the present disclosure. In some embodiments, to further enlarge the viewing angle of the fresnel projection screen 1, the surface of the surface layer 133 on the side (left side) away from the fresnel lens layer may be distributed with the diffusing particles 40. Through adding diffusion particle 40 on this surface, can increase the visual angle of watching of fei nieer projection screen, also can increase the roughness on this surface simultaneously for more passing through of light this surface, be difficult to form clear image elsewhere, promote spectator's watching experience.

As shown in fig. 9, fig. 9 is a schematic structural diagram of another surface layer 133 provided in the embodiment of the present application. In some embodiments, the surface of the surface layer 133 on the side (left side) away from the fresnel lens layer is distributed with microlenses (Lenti) 50. By providing the micro-lenses 50, the viewing angle of the projection screen can be increased as well, and the effect of reducing the surface reflectivity is achieved. Wherein the shape of the microlens 50 may be a hemisphere.

Referring to fig. 10, fig. 10 is a schematic structural view of the microlens 50 of the surface layer 133 shown in fig. 9 after being subjected to the atomization treatment. In some embodiments, the surface of microlens 50 may be a fogging surface. The surface of the micro lens 50 is atomized, the roughness of the surface can be further improved, the reflectivity of light on the surface is further reduced, the transmittance of the light is higher, the utilization efficiency of the light projected by the projector is finally improved, and the probability of forming a clear image in other places due to light reflection is reduced.

In some embodiments, as shown in fig. 3, the functional layer 13 may further include a substrate layer 134, and the substrate layer 134 may be located between the surface layer 133 and the reflective layer 11. The substrate layer 134 may serve as a support base for the fresnel projection screen 1. Taking the fresnel projection screen 1 shown in fig. 3 as an example, the fresnel projection screen 1 includes two substrate layers 134, and the substrate layers 134 can be used as bases for manufacturing the surface layer 133, the diffusion layer 131, and the fresnel lens layer 12. When the surface layer 133 is manufactured, the UV glue is coated on the surface of the base material layer 134 on the side away from the fresnel lens layer 12, and then the UV glue is cured by a UV light source lamp, so that the surface layer 133 can be manufactured.

Of course, as shown in fig. 5, the fresnel projection screen 1 may also include a substrate layer 134. The substrate layer 134 is located between the fresnel lens layer 12 and the surface layer 133, and can be used as a base for manufacturing the surface layer 133 and the fresnel lens layer 12. In manufacturing the surface layer 133 and the fresnel lens layer 12, the fresnel lens layer 12 and the surface layer 133 may be manufactured on both surfaces of the base material layer 134.

The substrate layer 134 may be made of different materials. For example, the substrate layer 134 may be made of Polyethylene terephthalate (PET) material. The PET material is flexible, which in turn enables the substrate layer 134 to be flexible and capable of being rolled. Of course, the substrate layer 134 may be made of other flexible materials, for example, the substrate layer 134 may be made of Thermoplastic polyurethane elastomer (TPU) material, and the TPU has elasticity and can achieve curling. Alternatively, the substrate layer 134 may also be made of Styrene Block Copolymers (SBC) flexible materials. For another example, the substrate layer 134 may be made of an MS material.

The MS material has high hardness, cannot be curled and has good flatness, so that the projection screen has good flatness. The TPU has wide hardness range, can still keep good elasticity and wear resistance when the hardness is increased, has good oil resistance, aging resistance and wear resistance, and has lower cost.

The SBC material has good flexibility, good mechanical properties, waterproof performance, and stronger tensile strength, tear strength and ball bursting strength than MS materials. Has better oxidation resistance, water resistance, weather resistance, chemical resistance and corrosion resistance. The material has rough lower surface, is in a three-dimensional net structure, has good bonding strength with various adhesives, and can be blended with other materials to improve the performance and strength of the material.

For another example, the substrate layer 134 may be made of Polyurethane (PU), polyethylene (PE), polyvinyl chloride (PVC), or polypropylene (PP). The PU material can adapt to the adhesion of base materials with different thermal expansion coefficients, a soft-hard transition layer can be formed between the PU material and the base materials, and the adhesion force is strong. Thus, it has better bonding with other layered structures of the projection screen. And has excellent buffering and shock-absorbing functions.

The PE material is odorless, nontoxic, wax-like in hand feeling, excellent in low-temperature resistance, good in chemical stability and capable of resisting corrosion of most of acid and alkali. Is insoluble in common solvents at room temperature, has low water absorption and excellent circuit insulation.

The PVC material has good size stability, good weather resistance and lower cost. Meanwhile, the PVC material can adjust the hardness by using a plasticizer. The PP material is easy to dye, light in texture, good in toughness, good in temperature resistance and chemical resistance.

As described above, the reflective layer 11 can reflect light. The reflective material in the reflective layer 11 may also be aluminum, silver, or a combination of silver and aluminum in order to achieve the reflective function of the reflective layer 11. For better reflection of light, different shapes of materials may be chosen as the material of the reflective layer. In the following, taking the example of selecting aluminum as the reflective material, several different reflective layers provided in the embodiments of the present application are exemplarily described with reference to the drawings.

In some embodiments, as shown in fig. 11, fig. 11 is a schematic structural diagram of a reflective layer 11 provided in this embodiment of the present application, and in order to improve the gain of the fresnel projection screen 1, powdered aluminum powder may be selected and coated on the fresnel lens layer 12 by spray printing or evaporation. Therefore, because the powdered aluminum powder is finer and more delicate and has insignificant directivity, most of the light emitted by the projector can be reflected out of the projection screen directionally according to the arrangement of the microstructure of the fresnel lens layer 12, and the light cannot be reflected around randomly, so that the gain of the projection screen is higher.

Further, when aluminum particles are selected as the reflective material, the diameter of the aluminum particles may range from 5um to 20um. The aluminum particles within this range have a small diameter, and thus, after the reflective layer 11 is formed, the aluminum particles form a compact reflective surface, and when light is irradiated on the reflective surface, the light can be reflected as much as possible, thereby avoiding waste of light energy. Meanwhile, when aluminum particles are selected as the reflective material, the reflective layer 11 can be made very thin, so that consumption of aluminum material can be reduced, and manufacturing cost can be saved.

In other embodiments, as shown in fig. 12, fig. 12 is a schematic structural diagram of another reflective layer 11 provided in the embodiments of the present application. When the reflective material of the reflective layer 11 is aluminum, a scaly aluminum powder may be selected. The scale-shaped aluminum powder is sprayed on the fresnel lens layer 12 by means of spray printing. The scaly aluminum powder has larger diameter-thickness ratio, so the aluminum has stronger binding capacity and is not easy to fall off. The ratio of the diameter to the thickness of the flaky aluminum powder may range from (40.

On the other hand, an embodiment of the present application provides a manufacturing method for manufacturing the fresnel projection screen, as shown in fig. 13, fig. 13 is a first flowchart of the fresnel projection screen manufacturing method provided in the embodiment of the present application, and the method may include steps S100 to S300.

S100: and manufacturing the functional layer.

Exemplarily, taking the fresnel projection screen shown in fig. 3 as an example, fig. 3 has a plurality of functional layers 13. The substrate layer 134 may be one formed in advance from a PET material. Then, the diffusion layer 131 is formed on one side of the base material layer 134 using one base material layer 134 as a base. The further substrate layer 134 may then be adhesively bonded to the diffusion layer 131 on the side remote from the further substrate layer 134. Then, the surface layer 133 may be formed on the surface of the base material layer 134 on the right side in fig. 3.

S200: and manufacturing a Fresnel lens layer on one side of the functional layer.

For example, taking the fresnel projection screen 1 shown in fig. 3 as an example, when the fresnel lens layer is manufactured, UV glue may be selected to be cured to form the fresnel lens layer. Since the UV paste has elasticity, the fresnel lens layer 12 is allowed to be curled. When preparation fresnel lens layer 12, glue the coating with the UV on the surface of substrate layer 134, then carry out the impression to fresnel lens layer 12 with special mould for fresnel lens layer 12 shaping, then reuse UV light source lamp solidifies UV glue, and the preparation of fresnel lens layer 12 can be accomplished in the drawing of patterns at last.

S300: and manufacturing a reflecting layer on one side of the Fresnel lens layer far away from the functional layer.

Taking the fresnel projection screen 1 shown in fig. 3 as an example, when the reflective layer 11 is manufactured, the reflective layer 11 can be manufactured by spraying the reflective material on the fresnel lens layer 12 by means of spray printing.

In some embodiments, as shown in fig. 14, fig. 14 is a second flowchart of a fresnel projection screen manufacturing method provided in the embodiments of the present application, and before the manufacturing of the functional layer, the manufacturing method may further include steps S10 to S20:

s10: the photochromic material is blended with the substrate material to form a blended material.

Illustratively, the base material may be a UV glue material into which the photochromic material is added. Thus, the UV glue added with the photochromic material can change color under different light irradiation conditions.

S20: the blended material is stirred to uniformly distribute the photochromic material over the base material.

The blended material can be used for manufacturing at least one of the Fresnel lens layer, the reflecting layer and the functional layer. By stirring the blending material, the photochromic material can be uniformly distributed in the substrate material, so that the photochromic material is uniformly distributed in the Fresnel lens layer, the reflection layer and the functional layer formed by manufacturing, the capacity of absorbing ambient light at each position in the Fresnel projection screen is similar, and the condition that the display picture has uneven brightness is avoided. Wherein, the photochromic material can be uniformly distributed in the substrate material by adopting a physical stirring mode.

In some embodiments, as shown in fig. 15, fig. 15 is a third schematic flow chart of the fresnel projection screen manufacturing method provided in the embodiments of the present application, and the manufacturing method may further include step S11 when the blending material is stirred.

S11: a dark dye is added to the blended material.

Therefore, photochromic materials and dark dyes are distributed in the Fresnel lens layer, the reflecting layer and the functional layer which are made of the blending materials, and the environment light resistance of the Fresnel projection screen is further improved.

Of course, in other embodiments, the dark dye may also be blended separately with the substrate material. In this way, the photochromic material and the dark dye can be distributed at different locations in the fresnel projection screen, avoiding interference between the photochromic material and the dark dye.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A fresnel projection screen, comprising:

a reflective layer for reflecting light;

the Fresnel lens layer and the reflecting layer are arranged in a laminated manner;

the functional layer is arranged on one side, far away from the reflecting layer, of the Fresnel lens layer in a laminated mode; and the number of the first and second groups,

a photochromic material distributed in at least one of the reflective layer, the Fresnel lens layer and the functional layer; the photochromic material is used for developing and fading under the change of illumination conditions.

2. A fresnel projection screen as recited in claim 1, wherein the fresnel projection screen further comprises:

a dark dye distributed within at least one of the reflective layer, the Fresnel lens layer, and the functional layer.

3. The fresnel projection screen of claim 2 wherein the dark dye is distributed within at least one of the reflective layer, the fresnel lens layer, and the functional layer on which the photochromic material is distributed.

4. Fresnel projection screen according to claim 3, characterised in that in the reflective layer, the fresnel lens layer or the functional layer, on which the dark dye and the photochromic material are distributed, the ratio of the mass of the dark dye to the photochromic material is greater than or equal to 1:1.

5. the fresnel projection screen of claim 2 wherein the dark dye and the photochromic material are distributed within different ones of the reflective layer, the fresnel lens layer, and the functional layer.

6. The fresnel projection screen of claim 1 wherein the photochromic material comprises at least one of spiropyran-based photochromic materials, diarylethene-based photochromic materials, azobenzene-based photochromic materials, fulgides, spirooxazines, transition metal oxide-based photochromic materials, metal halides, and rare earth complexes.

7. A fresnel projection screen as recited in claim 1, wherein the fresnel projection screen further comprises:

protective particles distributed in at least one of the reflecting layer, the Fresnel lens layer and the functional layer; the interior of the protective particles is hollow, so that a cavity is formed;

at least a portion of the photochromic material is disposed within the cavity of the protective particle.

8. The fresnel projection screen of claim 1, wherein the photochromic material is granular and has a particle size of 5nm to 20um.

9. A method for making a fresnel projection screen as claimed in any one of claims 1 to 8, characterized in that the method comprises:

manufacturing the functional layer;

manufacturing the Fresnel lens layer on one side of the functional layer;

and manufacturing the reflecting layer on one side of the Fresnel lens layer far away from the functional layer.

10. The method of claim 9, further comprising:

blending the photochromic material with a substrate material to form a blended material;

stirring the blended material to uniformly distribute the photochromic material on the base material;

wherein the blended material is used for manufacturing at least one of the Fresnel lens layer, the reflection layer and the functional layer.

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