Freckle-eliminating screen and manufacturing method thereof

Abstract

The invention provides a speckle-eliminating screen and a manufacturing method thereof, and relates to the field of laser speckle elimination, and the speckle-eliminating screen comprises a base material layer, a metal reflection layer, an inner-layer light-transmitting module, an outer-layer light-transmitting module and a surface layer which are stacked in sequence; the surface of the base material layer comprises a concave-convex structure, and the shape of the metal reflecting layer is matched with that of the concave-convex structure; the inner-layer light-transmitting module comprises a first inner-layer light-transmitting area and a second inner-layer light-transmitting area, and the first inner-layer light-transmitting area abuts against the metal reflecting layer; the outer layer light-transmitting module comprises a first outer layer light-transmitting area and a second outer layer light-transmitting area, and the first outer layer light-transmitting area is attached to the second inner layer light-transmitting area; the difference value between the refractive index of the first outer-layer light-transmitting area and the refractive index of the second inner-layer light-transmitting area is smaller than a first preset threshold value; the second outer-layer light-transmitting area is propped against the surface layer; the difference value between the refractive index of the surface layer and the refractive index of the second outer-layer light-transmitting area is smaller than a second preset threshold value; light rays can be refracted for multiple times in the surface layer, the outer layer light-transmitting module and the inner layer light-transmitting module, multi-medium reflection is carried out, and laser speckles are restrained.

Description

Technical Field

[0001] The invention relates to the field of laser speckle elimination, and in particular to a speckle elimination screen and a manufacturing method thereof. Background Art

[0002] Three-primary-color laser projection has a larger color display range, ultra-long service life, excellent beam quality, and higher electro-optical conversion efficiency; three-primary-color laser projection is widely used in the projection industry.

[0003] However, laser projection has the characteristic of strong phase interference. When the laser is irradiated onto the surface of a rough object, the scattered light reflected from the rough surface will coherently superimpose during the propagation process, and "fight" against each other, forming randomly and irregularly distributed bright and dark spots in space, which is called laser "speckle". The speckle phenomenon will not only seriously affect the clarity and perception of the image, but also exist at any picture size and viewing distance, with obvious noise granularity and frosted glass feeling, which will accelerate eye fatigue and cause dizziness.

[0004] In order to alleviate the speckle phenomenon and improve the quality of the picture, refer to patent document CN107831634A, which provides a vibrating screen for eliminating laser speckle. The vibrating electromagnet is controlled by a vibration controller. The intermittent magnetic force generated by the vibrating electromagnet attracts the screen to vibrate at a certain frequency. The position of the speckle formation on the screen is disturbed by the vibration of the screen, making the speckle in a boiling state. Since a speckle bright spot or dark spot stays in the same position for a very short time, coupled with the visual persistence phenomenon of the human eye, when the vibration reaches a certain frequency, the human eye will not feel the speckle. However, through the screen vibration, the screen vibration will produce noise, affecting the audio-visual of the theater.

[0005] At the same time, the effect of partial speckle elimination can be achieved by increasing the number of laser light source wavelengths, such as 6P laser, 9P laser, 2 or 3 groups of RGB lasers, increasing the bandwidth, eliminating the coherence of the laser, but this method is costly and does not have a good speckle elimination effect. Summary of the invention

[0006] The purpose of the present invention is to provide a speckle-eliminating screen and a method for manufacturing the same, so as to solve the problems existing in the above-mentioned prior art. There is a refractive index difference between the outer light-transmitting module and the inner light-transmitting module, and the light can be refracted multiple times in the surface layer, the outer light-transmitting module and the inner light-transmitting module, forming multi-medium reflection, changing the transmission angle of the light, making the incident angle and the exit angle of the projection light diversified, reducing the coherence of the light source, suppressing laser speckle, having a low manufacturing cost and no noise interference.

[0007] To achieve the above-mentioned purpose, the present invention provides the following scheme: a desmearing screen is provided, comprising a substrate layer, a metal reflective layer, an inner light-transmitting module, an outer light-transmitting module and a surface layer stacked in sequence; the surface of the substrate layer comprises a concave-convex structure, and the shape of the metal reflective layer matches the concave-convex structure; the inner light-transmitting module comprises a first inner light-transmitting area and a second inner light-transmitting area, and the first inner light-transmitting area abuts the metal reflective layer; the outer light-transmitting module comprises a first outer light-transmitting area and a second outer light-transmitting area, and the first outer light-transmitting area abuts the second inner light-transmitting area; the difference between the refractive index of the first outer light-transmitting area and the refractive index of the second inner light-transmitting area is less than a first preset threshold value; the second outer light-transmitting area abuts the surface layer; the difference between the refractive index of the surface layer and the refractive index of the second outer light-transmitting area is less than a second preset threshold value.

[0008] Preferably, the refractive index of the surface layer is greater than the refractive index of the second outer light-transmitting area, and the refractive index of the first outer light-transmitting area is less than the refractive index of the second inner light-transmitting area.

[0009] Preferably, the inner light-transmitting module includes a first AG film layer, the first inner light-transmitting area and the second inner light-transmitting area are both arranged on the first AG film layer; the surface layer includes a second AG film layer; and the second AG film layer is bonded to the second outer light-transmitting area.

[0010] Preferably, the outer light-transmitting module includes a first PET film layer, a TPU film layer and a second PET film layer stacked in sequence, the first outer light-transmitting area is arranged on the first PET film layer; the second outer light-transmitting area is arranged on the second PET film layer, and the refractive indexes of the first PET film layer and the second PET film layer are both smaller than the refractive index of the TPU film layer.

[0011] Preferably, the refractive indexes of the first PET film layer and the second PET film layer are both between 1.2 and 1.6, and the refractive index of the TPU film layer is between 1.3 and 1.7.

[0012] Preferably, the outer light-transmitting module is composed of a third PET film layer, and the first outer light-transmitting area and the second outer light-transmitting area are both arranged on the third PET film layer.

[0013] Preferably, the refractive indexes of the first AG film layer and the second AG film layer are both between 1.5 and 1.9.

[0014] Preferably, the thickness of the first PET film layer, the TPU film layer and the second PET film layer are all 0.05 mm.

[0015] A method for manufacturing a speckle-eliminating screen, using the above-mentioned speckle-eliminating screen, comprises the following steps:

[0016] S1, processing a groove of a preset size on the substrate layer to form a concave-convex structure;

[0017] S2, disposing a metal reflective layer on the concave-convex structure, wherein the shape of the metal reflective layer matches the concave-convex structure;

[0018] S3, selecting a first light-transmitting film as an inner light-transmitting module; and disposing the first light-transmitting film on the metal reflective layer;

[0019] S4, selecting a second light-transmitting film in the outer light-transmitting module, wherein the difference between the refractive index of the second light-transmitting film and the refractive index of the first light-transmitting film is within a preset range; and disposing the second light-transmitting film on the first light-transmitting film;

[0020] S5. Select a surface light-transmitting film in the surface layer, and the difference between the refractive index of the surface light-transmitting film and the refractive index of the second light-transmitting film is within a preset range, and arrange the surface light-transmitting film above the second light-transmitting film.

[0021] Preferably, between step S4 and step S5, the method also includes selecting a third light-transmitting film and a fourth light-transmitting film in the outer light-transmitting module, wherein the fourth light-transmitting film is arranged on the third light-transmitting film, and the difference between the refractive index of the third light-transmitting film and the refractive index of the fourth light-transmitting film is within a preset range; the third light-transmitting film is arranged on the second light-transmitting film, and the fourth light-transmitting film abuts against the inner side surface of the surface light-transmitting film.

[0022] Compared with the prior art, the present invention has achieved the following technical effects:

[0023] 1. There is a refractive index difference between the surface layer and the outer light-transmitting module, and between the outer light-transmitting module and the inner light-transmitting module. The light can be refracted multiple times in the surface layer, the outer light-transmitting module, and the inner light-transmitting module, forming multi-medium reflection, changing the transmission angle of the light, making the incident angle and the exit angle of the projection light diversified, which can reduce the coherence of the light source, suppress laser speckle, have a low manufacturing cost and no noise interference.

[0024] Other technical solutions of the present invention achieve the following technical effects:

[0025] 2. In the speckle-eliminating screen, the second AG film layer, the second PET film layer, the TPU film layer, the first PET film layer, the first AG film layer, the metal reflective layer and the substrate layer are sequentially stacked from the outside to the inside, so that the high and low refractive indexes are arranged alternately from the outside to the inside of the screen, so that the light can be refracted multiple times in the high and low alternating refractive indices during the transmission process, forming multi-medium reflection, changing the transmission angle of the light, diversifying the incident angle and the output angle of the projection light, improving the viewing angle, changing the optical path difference of the polarized light, which can effectively eliminate the polarization of the light, reduce the coherence of the light source, and suppress the laser speckle.

[0026] 3. The number of layers in the outer light-transmitting module can be selected. When the outer light-transmitting module only includes a PET layer, a flexible dissipation-spot screen is formed with good light transmittance. When the outer light-transmitting module includes a second PET film layer, a TPU film layer, and a first PET film layer stacked in layers, the dissipation-spot effect can be further increased, and the hardness of the screen can be increased to form a hard dissipation-spot screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 This is an overall schematic diagram of the anti-speckle screen of the present invention;

[0029] Figure 2 This is an overall schematic diagram of another speckle screen of the present invention.

[0030] Among them, 1. substrate layer; 2. metal reflective layer;

[0031] 3. Inner light-transmitting module; 31. First AG film layer;

[0032] 4. Outer light-transmitting module; 41. First PET film layer; 42. TPU film layer; 43. Second PET film layer; 44. Third PET film layer;

[0033] 5. Surface layer; 51. Second AG film layer;

[0034] 61. First SIO2 layer; 62. Second SIO2 layer. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Embodiment 1:

[0038] Please refer to Figure 1-2 As shown, in this embodiment, a speckle-eliminating screen is provided, comprising a substrate layer 1, a metal reflective layer 2, an inner light-transmitting module 3, an outer light-transmitting module 4 and a surface layer 5 which are sequentially stacked from the inside to the outside. The surface of the substrate layer 1 has a concave-convex structure, and the metal reflective layer 2 is directly attached to the concave-convex structure. The shape of the metal reflective layer 2 matches the shape of the concave-convex structure, that is, the surface of the metal reflective layer 2 also has a concave-convex shape, and the concave-convex shape of the metal reflective layer 2 is parallel to the concave-convex structure on the surface of the substrate layer 1. The inner light-transmitting module 3 comprises a first inner light-transmitting area and a second inner light-transmitting area, and the first inner light-transmitting area is attached to the metal reflective layer 2; preferably, the surface of the first inner light-transmitting area is the inner side surface of the inner light-transmitting module 3, and the surface of the second inner light-transmitting area is the outer side surface of the inner light-transmitting module 3. The outer light-transmitting module 4 includes a first outer light-transmitting area and a second outer light-transmitting area. Preferably, the surface of the first outer light-transmitting area is the inner side of the outer light-transmitting module 4, and the surface of the second outer light-transmitting area is the outer side of the outer light-transmitting module 4. The first outer light-transmitting area is attached to the second inner light-transmitting area, and the difference between the refractive index of the first outer light-transmitting area and the refractive index of the second inner light-transmitting area is less than a first preset threshold value. The second outer light-transmitting area is attached to the surface layer 5, and the difference between the refractive index of the surface layer 5 and the refractive index of the second outer light-transmitting area is less than a second preset threshold value. Preferably, the first preset threshold value and the second preset threshold value are both 0.3.

[0039] Working principle: the light is incident on the surface layer 5 and refracted on the surface layer 5. When the surface layer 5 enters the second outer light-transmitting area, since the difference between the refractive index of the surface layer 5 and the refractive index of the second outer light-transmitting area is less than the second preset threshold, the light is refracted again as expected. Then the light is incident from the outer light-transmitting module 4 to the inner light-transmitting module 3. At this time, since the difference between the refractive index of the first outer light-transmitting area and the refractive index of the second inner light-transmitting area is less than the first preset threshold, the light is refracted again as expected when it is incident from the first outer light-transmitting area to the second inner light-transmitting area; then the light is incident from the inner light-transmitting module 3 to the metal reflective layer 2, the light is reflected by the metal reflective layer 2, and after multiple refractions, it is emitted from the surface layer 5 and can be received by the human eye. Due to the refractive index difference between the surface layer 5 and the outer light-transmitting module 4, and the refractive index difference between the outer light-transmitting module 4 and the inner light-transmitting module 3, the light can be refracted multiple times in the surface layer 5, the outer light-transmitting module 4, and the inner light-transmitting module 3, forming multi-medium reflection, changing the transmission angle of the light, diversifying the incident angle and the output angle of the projection light, improving the viewing angle, changing the optical path difference of the polarized light, and effectively eliminating the polarization of the light, which can reduce the coherence of the light source and suppress laser speckle.

[0040] In one embodiment, the refractive index of the surface layer 5 is greater than the refractive index of the second outer light-transmitting area, and the refractive index of the first outer light-transmitting area is less than the refractive index of the second inner light-transmitting area. In the direction from the outside to the inside of the screen, the mediums with high and low refractive indices are arranged alternately, so that the light can be transmitted in the mediums with high and low refractive indices, so that the light is refracted multiple times during the transmission process. Preferably, the difference in refractive index between adjacent media is within 0.3.

[0041] In one embodiment, the first inner light-transmitting module 3 includes a first AG film layer 31, and the first inner light-transmitting area and the second inner light-transmitting area are both arranged on the first AG film layer 31. The surface layer 5 includes a second AG film layer 51, and a UV light-curing adhesive is attached to the second AG film layer 51. Preferably, the outer surface of the second AG film layer 51 is corrugated or has a concave-convex structure. This can form a relatively rough surface on the outer surface of the dissipation screen to reduce the glare phenomenon. UV light-curing adhesive is also attached to the first AG film layer 31.

[0042] In this embodiment, the outer light-transmitting module 4 includes a first PET film layer 41, a TPU film layer 42 and a second PET film layer 43, and the first PET film layer 41, the TPU film layer 42 and the second PET film layer 43 are stacked in sequence from the inside to the outside. The first outer light-transmitting area is arranged on the first PET film layer 41, and the inner surface of the first outer light-transmitting area is the inner surface of the first PET film layer 41. The inner surface of the first PET film layer 41 is directly bonded to the first AG film layer 31. The inner surface and outer surface of the TPU film layer 42 are bonded to the first PET film layer 41 and the second PET film layer 43 respectively. The second outer light-transmitting area is arranged on the second PET film layer 43, and the outer surface of the second outer light-transmitting area is the outer surface of the second PET film layer 43. The outer surface of the second PET film layer 43 is bonded to the second AG film layer 51. And the refractive index of the first PET film layer 41 and the refractive index of the second PET film layer 43 are both less than the refractive index of the TPU film layer 42.

[0043] In this way, in the speckle-eliminating screen, the second AG film layer 51, the second PET film layer 43, the TPU film layer 42, the first PET film layer 41, the first AG film layer 31, the metal reflective layer 2 and the substrate layer 1 are stacked in sequence from the outside to the inside. A hard speckle-eliminating screen is formed, and as the medium changes from the outside to the inside, the refractive index is arranged alternately, and the refractive index difference of adjacent media is within a preset range. Multi-medium reflection is formed by the refractive index difference, and the optical path difference of polarized light is changed, which can effectively eliminate the polarization of light and reduce laser speckle.

[0044] In this embodiment, the refractive index of the first PET film layer 41 and the second PET film layer 43 are both between 1.2-1.6, and the refractive index of the first PET film layer 41 and the second PET film layer 43 is preferably 1.4; the refractive index of the TPU film layer 42 is between 1.3-1.7, and the refractive index of the TPU film layer 42 is preferably 1.5; the refractive index of the first AG film layer 31 and the second AG film layer 51 are both between 1.5-1.9; the refractive index of the first AG film layer 31 and the second AG film layer 51 is preferably 1.7. The refractive index difference between the adjacent two sides is less than or equal to 0.3.

[0045] In this embodiment, the metal reflective layer 2 is an AL layer, i.e., an aluminum layer. A SIO2 layer, i.e., a silicon dioxide layer, is attached to the AL layer, and the SIO2 layer includes a first SIO2 layer 61 and a second SIO2 layer 62. Preferably, a silicon dioxide and aluminum mixed coating is formed on the substrate layer 1, and the silicon dioxide and aluminum mixed coating includes an AL layer and a SIO2 layer. The silicon dioxide and aluminum mixed coating has good reflective properties.

[0046] In one embodiment, the outer light-transmitting module 4 only includes the third PET film layer 44, that is, the outer light-transmitting module 4 is composed of the third PET film layer 44. The first outer light-transmitting area and the second outer light-transmitting area are both arranged on the third PET film layer 44. The inner surface of the third PET film layer 44 is bonded to the first AG film layer 31; the outer surface of the third PET film layer 44 is bonded to the second AG film layer 51. The refractive index of the third PET film layer 44 is also between 1.2 and 1.6, and the refractive index of the third PET film layer 44 is preferably 1.4. Since the outer light-transmitting module 4 only includes the third PET film layer 44, the overall softness of the desmearing screen is better, forming a flexible desmearing screen. Moreover, the overall thickness is small, and the light transmittance will increase.

[0047] In one embodiment, the thickness of the first PET film layer 41, the TPU film layer 42 and the second PET film layer 43 are all 0.05 mm. Meanwhile, the thickness of the third PET film layer 44 is also 0.05 mm. The substrate layer 1 includes an organic silicon material.

[0048] Embodiment 2:

[0049] This embodiment provides a method for manufacturing a speckle-eliminating screen, using the speckle-eliminating screen in the first embodiment; the method comprises the following steps:

[0050] S1, processing a groove of a preset size on the substrate layer 1, thereby forming a concave-convex structure on the substrate layer 1;

[0051] S2, attaching a metal reflective layer 2 on the concavo-convex structure, which can be formed by spraying, and the shape of the metal reflective layer 2 matches the concavo-convex structure;

[0052] S3, select the first light-transmitting film as the inner light-transmitting module 3; attach the first light-transmitting film to the metal reflective layer 2; the first light-transmitting film can be the first AG film layer 31; the attachment method of the first AG film layer 31 to the metal reflective layer 2 can be adaptively selected according to actual conditions;

[0053] S4, select the second light-transmitting film in the outer light-transmitting module 4, the second light-transmitting film can be the first PET film layer 41, and the difference between the refractive index of the second light-transmitting film and the refractive index of the first light-transmitting film is in a preset range, and the preset range value is preferably: less than or equal to 0.3. Preferably, the refractive index of the second light-transmitting film is between 1.2-1.6, and the refractive index of the first light-transmitting film is between 1.5-1.9, wherein the refractive index of the second light-transmitting film is preferably 1.4, and the refractive index of the first light-transmitting film is preferably 1.7; attach the second light-transmitting film to the first light-transmitting film;

[0054] S5. Select a surface light-transmitting film in the surface layer 5. The surface light-transmitting film can be the second AG film layer 51, and the difference between the refractive index of the surface light-transmitting film and the refractive index of the second light-transmitting film is in a preset range. The refractive index of the surface light-transmitting film is preferably between 1.5 and 1.9, and the refractive index of the surface light-transmitting film is preferably 1.7; attach the surface light-transmitting film to the second light-transmitting film.

[0055] S6. Process a corrugated or concave-convex structure on the surface of the surface light-transmitting film; since the outer light-transmitting module 4 only includes the second light-transmitting film at this time, it can effectively suppress speckle while making the screen have good flexibility and better light transmittance, forming a flexible anti-speckle screen.

[0056] In this embodiment, between step S4 and step S5, it also includes selecting the third light-transmitting film and the fourth light-transmitting film in the outer light-transmitting module 4. At this time, the outer light-transmitting module 4 includes the second light-transmitting film, the third light-transmitting film and the fourth light-transmitting film. And the fourth light-transmitting film is stacked on the third light-transmitting film; the refractive index difference between the third light-transmitting film and the fourth light-transmitting film is within a preset range, preferably, the refractive index of the third light-transmitting film is between 1.3-1.7, and the refractive index of the fourth light-transmitting film is between 1.2-1.6; wherein the refractive index of the third light-transmitting film is preferably 1.5; the refractive index of the fourth light-transmitting film is preferably 1.4. The third light-transmitting film is bonded to the second light-transmitting film, and the fourth light-transmitting film is bonded to the surface light-transmitting film. The third light-transmitting film can be a TPU film layer 42, and the fourth light-transmitting film can be a second PET film layer 43. Thus, the outer light-transmitting module 4 includes the second light-transmitting film, the third light-transmitting film and the fourth light-transmitting film, which makes the overall hardness of the anti-speckle screen higher, forming a hard anti-speckle screen, and can further enhance the anti-speckle effect.

[0057] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0058] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A speckle-eliminating screen, characterized in that: It comprises a substrate layer (1), a metal reflective layer (2), an inner light-transmitting module (3), an outer light-transmitting module (4) and a surface layer (5) which are stacked in sequence; The surface of the substrate layer (1) comprises a concavo-convex structure, and the shape of the metal reflective layer (2) matches the concavo-convex structure; The inner light-transmitting module (3) comprises a first inner light-transmitting area and a second inner light-transmitting area, and the first inner light-transmitting area is in contact with the metal reflective layer (2); The outer light-transmitting module (4) comprises a first outer light-transmitting area and a second outer light-transmitting area, the first outer light-transmitting area is in contact with the second inner light-transmitting area; the difference between the refractive index of the first outer light-transmitting area and the refractive index of the second inner light-transmitting area is less than a first preset threshold; the second outer light-transmitting area is in contact with the surface layer (5); the difference between the refractive index of the surface layer (5) and the refractive index of the second outer light-transmitting area is less than a second preset threshold.

2. The anti-speckle screen according to claim 1, characterized in that: The refractive index of the surface layer (5) is greater than the refractive index of the second outer light-transmitting area, and the refractive index of the first outer light-transmitting area is less than the refractive index of the second inner light-transmitting area.

3. The anti-speckle screen according to claim 1, characterized in that: The inner light-transmitting module (3) comprises a first AG film layer (31); the first inner light-transmitting area and the second inner light-transmitting area are both arranged on the first AG film layer (31); the surface layer (5) comprises a second AG film layer (51); and the second AG film layer (51) is bonded to the second outer light-transmitting area.

4. The anti-speckle screen according to claim 3, characterized in that: The outer light-transmitting module (4) comprises a first PET film layer (41), a TPU film layer (42) and a second PET film layer (43) which are stacked in sequence, the first outer light-transmitting area being arranged on the first PET film layer (41); the second outer light-transmitting area being arranged on the second PET film layer (43), and the refractive indexes of the first PET film layer (41) and the second PET film layer (43) being both smaller than the refractive index of the TPU film layer (42).

5. The anti-speckle screen according to claim 4, characterized in that: The refractive index of the first PET film layer (41) and the second PET film layer (43) are both between 1.2 and 1.6, and the refractive index of the TPU film layer (42) is between 1.3 and 1.

7.

6. The anti-speckle screen according to claim 3, characterized in that: The outer light-transmitting module (4) is composed of a third PET film layer (44), and the first outer light-transmitting area and the second outer light-transmitting area are both arranged on the third PET film layer (44).

7. The anti-speckle screen according to claim 3, characterized in that: The refractive indexes of the first AG film layer (31) and the second AG film layer (51) are both between 1.5 and 1.

9.

8. The anti-speckle screen according to claim 4, characterized in that: The thickness of the first PET film layer (41), the TPU film layer (42) and the second PET film layer (43) are all 0.05 mm.

9. A method for manufacturing a speckle-eliminating screen, characterized in that: Using the anti-speckle screen as described in any one of claims 1 to 8 comprises the following steps: S1, processing a groove of a preset size on the substrate layer (1) to form a concave-convex structure; S2, arranging a metal reflective layer (2) on the concavo-convex structure, wherein the shape of the metal reflective layer (2) matches the concavo-convex structure; S3, selecting a first light-transmitting film as the inner light-transmitting module (3); and arranging the first light-transmitting film on the metal reflective layer (2); S4, selecting a second light-transmitting film in the outer light-transmitting module (4), wherein the difference between the refractive index of the second light-transmitting film and the refractive index of the first light-transmitting film is within a preset range; and arranging the second light-transmitting film on the first light-transmitting film; S5, selecting a surface transparent film in the surface layer (5), wherein the difference between the refractive index of the surface transparent film and the refractive index of the second transparent film is within a preset range, and arranging the surface transparent film above the second transparent film.

10. The method for manufacturing a speckle-eliminating screen according to claim 9, characterized in that: The method further includes, between step S4 and step S5, selecting a third light-transmitting film and a fourth light-transmitting film in the outer light-transmitting module (4), wherein the fourth light-transmitting film is arranged on the third light-transmitting film, and the difference between the refractive index of the third light-transmitting film and the refractive index of the fourth light-transmitting film is within a preset range; and the third light-transmitting film is arranged on the second light-transmitting film, and the fourth light-transmitting film is in contact with the inner side surface of the surface light-transmitting film.

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