A diffusing screen and a method for manufacturing the same

Abstract

The application provides a speckle-eliminating screen and a manufacturing method thereof, relates to the field of laser speckle elimination, and comprises a substrate layer, a metal reflection layer, an inner light-transmitting module, an outer light-transmitting module and a surface layer which are sequentially stacked; the surface of the substrate layer comprises a concave-convex structure, and the shape of the metal reflection layer is matched with 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 is in abutment with the metal reflection 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 is attached to 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 is in abutment with 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; light can be refracted multiple times in the surface layer, the outer light-transmitting module and the inner light-transmitting module, multiple medium reflection is carried out, and laser speckle is inhibited.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of laser speckle dissipation, in particular to a speckle dissipation screen and a manufacturing method thereof. BACKGROUND

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

[0003] However, laser projection has strong coherent interference characteristics; when laser irradiates a rough object surface, the scattered light reflected from the rough object surface will be coherent superimposed and fight with each other in the propagation process, and randomly and irregularly distributed bright spots and dark spots are formed in space, which is called laser speckle. The speckle phenomenon not only seriously affects the clarity and visual effect of the image, but also exists at any picture size and viewing distance, has obvious noise particle and ground glass feeling, accelerates eye fatigue, and produces dizziness.

[0004] In order to alleviate the speckle phenomenon and improve the quality of the picture, reference patent document CN107831634A provides a vibration screen for eliminating laser speckle; the vibration screen is controlled by a vibration controller to control the operation of a vibration electromagnet; the vibration electromagnet generates intermittent magnetic force to attract the screen to vibrate at a certain frequency; the vibration of the screen disturbs the position of the speckle formed on the screen, so that the speckle is in a boiling state; since a speckle bright spot or dark spot stays in the same position for a very short time, and the human eye has a visual persistence phenomenon, when the vibration reaches a certain frequency, the human eye will not feel the speckle. However, the screen vibration will have noise, which affects the audio-visual effect of the cinema.

[0005] At the same time, the number of laser wavelengths can be increased, such as 6P laser, 9P laser, 2 groups or 3 groups of RGB laser, the frequency bandwidth is increased, the coherence of the laser is eliminated, and the effect of partially dissipating speckle is achieved. However, this method has a high cost and cannot have a good speckle dissipation effect. SUMMARY

[0006] The purpose of the present application is to provide a speckle dissipation screen and a manufacturing method thereof, so as to solve the problems existing in the prior art; there is a refractive index difference between the outer light transmission module and the inner light transmission module, the light can be refracted multiple times in the surface layer, the outer light transmission module and the inner light transmission module, multiple medium reflection is formed, the transmission angle of the light is changed, the incidence angle and the emission angle of the projection light are diversified, the coherence of the light source is reduced, the laser speckle is suppressed, the manufacturing cost is low, and there is no noise interference.

[0007] To achieve the above-mentioned objectives, the present invention provides the following solution: a speckle-eliminating 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; the second outer light-transmitting area abuts the surface layer; and 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.

[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; 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 index 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 index 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 index 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 aforementioned speckle-eliminating screen, comprises the following steps:

[0016] S1, processing grooves of preset sizes on the base material 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 transparent film in the surface layer, 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 dispose the surface transparent film above the second transparent film.

[0021] Preferably, between step S4 and step S5, the method further 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 output angle of the projection light diversified, which can reduce the coherence of the light source, suppress laser speckle, and have a low manufacturing cost without noise interference.

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

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

[0026] 3. The number of layers in the outer light-transmitting module can be selected. When the outer light-transmitting module consists only of a PET layer, a flexible, speckle-free 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, the speckle-free effect is further enhanced, while the screen's hardness is increased, forming a rigid, speckle-free 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 following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0028] Figure 1 This is an overall schematic diagram of the speckle-eliminating 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 clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts 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] Example 1:

[0038] Please refer to Figure 1-2 As shown, this embodiment provides a speckle-eliminating screen, 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, stacked sequentially from the inside out. The surface of the substrate layer 1 has a concavo-convex structure, and the metal reflective layer 2 is directly attached to the concavo-convex structure. The shape of the metal reflective layer 2 matches the shape of the concavo-convex structure, that is, the surface of the metal reflective layer 2 also has a concavo-convex shape, and the concavo-convex shape of the metal reflective layer 2 is parallel to the concavo-convex structure on the surface of the substrate layer 1. The inner light-transmitting module 3 includes a first inner light-transmitting region and a second inner light-transmitting region, and the first inner light-transmitting region is bonded to the metal reflective layer 2. Preferably, the surface of the first inner light-transmitting region serves as the inner side surface of the inner light-transmitting module 3, and the surface of the second inner light-transmitting region serves as the outer side surface of the inner light-transmitting module 3. The outer light-transmitting module 4 includes a first outer light-transmitting region and a second outer light-transmitting region. Preferably, the surface of the first outer light-transmitting region serves as the inner side of the outer light-transmitting module 4, and the surface of the second outer light-transmitting region serves as the outer side of the outer light-transmitting module 4. The first outer light-transmitting region is bonded to the second inner light-transmitting region, and the difference in refractive index between the first outer light-transmitting region and the second inner light-transmitting region is less than a first preset threshold. The second outer light-transmitting region is bonded to the surface layer 5, and the difference in refractive index between the surface layer 5 and the second outer light-transmitting region is less than a second preset threshold. Preferably, both the first preset threshold and the second preset threshold are 0.3.

[0039] The working principle is that 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, and 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; and then it 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, 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 light, diversifying the incident angle and the output angle of the projection light, improving the viewing angle, and changing the optical path difference of polarized light, which can effectively eliminate the polarization of light, 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 that of the second outer light-transmitting region, while the refractive index of the first outer light-transmitting region is less than that of the second inner light-transmitting region. From the outside of the screen to the inside, media with alternating high and low refractive indices are arranged, allowing light to propagate through these alternating media, resulting in multiple refractions during transmission. 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, with the first inner light-transmitting area and the second inner light-transmitting area both disposed on the first AG film layer 31. The surface layer 5 includes a second AG film layer 51, to which a UV light-curing adhesive is attached. Preferably, the outer surface of the second AG film layer 51 is corrugated or has a concave-convex structure. This creates a relatively rough surface on the outer surface of the anti-speckle screen, reducing glare. 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. The first PET film layer 41, the TPU film layer 42, and the second PET film layer 43 are stacked sequentially from the inside out. A first outer light-transmitting region is provided on the first PET film layer 41. The inner surface of the first outer light-transmitting region corresponds to 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 and outer surfaces of the TPU film layer 42 are bonded to the first PET film layer 41 and the second PET film layer 43, respectively. A second outer light-transmitting region is provided on the second PET film layer 43. The outer surface of the second outer light-transmitting region corresponds to 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. Furthermore, the refractive indexes of the first PET film layer 41 and the second PET film layer 43 are both lower than the refractive index of the TPU film layer 42.

[0043] Thus, 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 this order from the outside in. This creates a rigid speckle-eliminating screen. As the medium changes from the outside in, the refractive index alternates between high and low, and the refractive index difference between adjacent media remains within a preset range. This refractive index difference creates multi-medium reflection, alternating the optical path difference of polarized light, effectively eliminating light polarization and reducing laser speckle.

[0044] In this embodiment, the refractive index of the first PET film layer 41 and the second PET film layer 43 is between 1.2 and 1.6, preferably 1.4. The refractive index of the TPU film layer 42 is between 1.3 and 1.7, preferably 1.5. The refractive index of the first AG film layer 31 and the second AG film layer 51 is between 1.5 and 1.9, preferably 1.7. The refractive index difference between adjacent 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. The SiO2 layer includes a first SiO2 layer 61 and a second SiO2 layer 62. Preferably, a mixed SiO2 and Al coating is formed on the substrate layer 1. The mixed SiO2 and Al coating includes an Al layer and a SiO2 layer. The mixed SiO2 and Al coating has excellent reflective properties.

[0046] In one embodiment, the outer light-transmitting module 4 comprises only the third PET film layer 44. The first and second outer light-transmitting regions are both disposed 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, while 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, preferably 1.4. Because the outer light-transmitting module 4 comprises only the third PET film layer 44, the resulting despeckle screen exhibits superior overall softness, resulting in a flexible despeckle screen. Furthermore, the overall thickness is reduced, resulting in increased light transmittance.

[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 comprises an organic silicon material.

[0048] Example 2:

[0049] This embodiment provides a method for manufacturing a speckle-eliminating screen, using the speckle-eliminating screen of the first embodiment. The method includes 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 concave-convex structure, which can be formed by spraying. The shape of the metal reflective layer 2 matches the concave-convex structure.

[0052] S3. Select a 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 a 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 a second transparent film in the outer transparent module 4. The second transparent film can be the first PET film layer 41. The difference between the refractive index of the second transparent film and the refractive index of the first transparent film is within a preset range. The preset range is preferably less than or equal to 0.3. Preferably, the refractive index of the second transparent film is between 1.2 and 1.6, and the refractive index of the first transparent film is between 1.5 and 1.9. The refractive index of the second transparent film is preferably 1.4, and the refractive index of the first transparent film is preferably 1.7. Attach the second transparent film to the first transparent film.

[0054] S5, selecting the surface light-transmitting film in the surface layer 5 as 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, preferably the refractive index of the surface light-transmitting film is between 1.5 and 1.9, and the refractive index of the surface light-transmitting film is preferably 1.7; and attaching the surface light-transmitting film to the second light-transmitting film.

[0055] S6, processing 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, the speckle can be effectively suppressed, and the silver screen has good flexibility, better light transmittance, and forms a flexible speckle-eliminating silver screen.

[0056] In the embodiment, between step S4 and step S5, the third light-transmitting film and the fourth light-transmitting film in the outer light-transmitting module 4 are also selected, 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 difference between the refractive index of the third light-transmitting film and the refractive index of the fourth light-transmitting film is in a preset range, preferably the refractive index of the third light-transmitting film is between 1.3 and 1.7, and the refractive index of the fourth light-transmitting film is between 1.2 and 1.6; wherein the refractive index of the third light-transmitting film is preferably 1.5; and the refractive index of the fourth light-transmitting film is preferably 1.4. The third light-transmitting film is attached to the second light-transmitting film, and the fourth light-transmitting film is attached 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. In this way, the outer light-transmitting module 4 includes the second light-transmitting film, the third light-transmitting film and the fourth light-transmitting film; the overall hardness of the speckle-eliminating silver screen is higher, forming a hard speckle-eliminating silver screen, and the speckle-eliminating effect can be further improved.

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

[0058] The principles and implementation manners of the present application are described by using specific examples in the present application, and the above embodiment descriptions are only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed. In conclusion, the content of the present description should not be understood as a limitation of the present application.

Claims

1. A speckle-eliminating screen, characterized in that: It comprises a base material layer (1), a metal reflective layer (2), an inner light-transmitting module (3), an outer light-transmitting module (4), and a surface layer (5) 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 abuts against 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 bonded to 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; 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; The inner light-transmitting module (3) comprises 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) comprises a second AG film layer (51); the second AG film layer (51) is bonded to the second outer light-transmitting area; The refractive index of the first AG film layer (31) and the second AG film layer (51) are both between 1.5 and 1.9; The first preset threshold and the second preset threshold are both 0.

3.

2. The anti-speckle screen according to claim 1, 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) stacked in sequence, wherein the first outer light-transmitting area is arranged on the first PET film layer (41); and the second outer light-transmitting area is 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) are both smaller than the refractive index of the TPU film layer (42).

3. The anti-speckle screen according to claim 2, 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.

4. The anti-speckle screen according to claim 1, wherein: 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).

5. The anti-speckle screen according to claim 2, wherein: 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.

6. A method for manufacturing a speckle-eliminating screen, characterized in that: Applying the speckle-eliminating screen according to any one of claims 1 to 5 comprises the following steps: S1, processing grooves of a preset size in the base material layer (1) to form a concave-convex structure; S2. Arranging a metal reflective layer (2) on the concave-convex structure, wherein the shape of the metal reflective layer (2) matches the concave-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. Select a surface transparent film in the surface layer (5), and 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 arrange the surface transparent film above the second transparent film.

7. The method for manufacturing a speckle-eliminating screen according to claim 6, wherein: Between step S4 and step S5, the method further includes 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 abuts against the inner side surface of the surface light-transmitting film.

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