Freckle-eliminating screen

Abstract

The utility model provides a speckle elimination screen, which relates to the field of laser speckle elimination and comprises a base material layer, a metal reflecting layer, an inner-layer light-transmitting module, an outer-layer light-transmitting module and a surface layer which are sequentially stacked, 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 utility model relates to the field of laser speckle dissipation, especially to a speckle dissipation screen. BACKGROUND

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

[0003] However, laser projection has strong coherent interference characteristics. When laser irradiates the rough surface of an object, the scattered light reflected from the rough surface of the object will be coherent superimposed in the propagation process, and will fight with each other to form randomly distributed bright spots and dark spots 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 frosted 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 vibrating screen for eliminating laser speckle. The vibrating screen controls the operation of the vibrating electromagnet through the vibrating controller, and the intermittent magnetic force generated by the vibrating electromagnet attracts 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 combined 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, the screen vibration will have noise, which will affect the audio-visual effect of the cinema.

[0005] At the same time, the number of laser source 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 high cost and cannot have good speckle dissipation effect. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a speckle dissipation screen 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, forming multiple medium reflection, changing the transmission angle of the light, making the incidence angle and the emission angle of the projection light diversified, reducing the coherence of the light source, suppressing the laser speckle, and having low manufacturing cost and no noise interference.

[0007] In order to realize the above-mentioned purpose, the utility model provides the following scheme: provide a kind of dissipation spot screen, including substrate layer, metal reflecting layer, inner layer light transmission module, outer layer light transmission module and surface layer which are sequentially stacked;The surface of the substrate layer includes concave-convex structure, the shape of the metal reflecting layer is matched with the concave-convex structure;The inner layer light transmission module includes first inner layer light transmission area and second inner layer light transmission area, and the first inner layer light transmission area is in abutment with the metal reflecting layer;The outer layer light transmission module includes first outer layer light transmission area and second outer layer light transmission area, and the first outer layer light transmission area is attached with the second inner layer light transmission area;The difference between the refractive index of the first outer layer light transmission area and the refractive index of the second inner layer light transmission area is less than first preset threshold value;The second outer layer light transmission 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 layer light transmission area is less than second preset threshold value.

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

[0009] Preferably, the inner layer light transmission module includes a first AG film layer, and the first inner layer light transmission area and the second inner layer light transmission 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 attached with the second outer layer light transmission area.

[0010] Preferably, the outer layer light transmission module includes a first PET film layer, a TPU film layer and a second PET film layer which are sequentially stacked, the first outer layer light transmission area is arranged on the first PET film layer, and the second outer layer light transmission 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 is both less 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 is 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 layer light transmission module is composed of a third PET film layer, and the first outer layer light transmission area and the second outer layer light transmission 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 is 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 is all 0.05 mm.

[0015] A manufacturing method of a dissipation spot screen, which is applied to the dissipation spot screen as above, includes the following steps:

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

[0017] S2, a metal reflection layer is arranged on the concave-convex structure, and the shape of the metal reflection layer matches the concave-convex structure;

[0018] S3, a first light transmission film is selected as an inner layer light transmission module; the first light transmission film is arranged on the metal reflection layer;

[0019] S4, a second light transmission film in an outer layer light transmission module is selected, and the difference between the refractive index of the second light transmission film and the refractive index of the first light transmission film is in a preset range; the second light transmission film is arranged on the first light transmission film;

[0020] S5, a surface layer light transmission film in a surface layer is selected, and the difference between the refractive index of the surface layer light transmission film and the refractive index of the second light transmission film is in a preset range; the surface layer light transmission film is arranged above the second light transmission film.

[0021] Preferably, between the step S4 and the step S5, a third light transmission film and a fourth light transmission film in the outer layer light transmission module are further selected, the fourth light transmission film is arranged on the third light transmission film, the difference between the refractive index of the third light transmission film and the refractive index of the fourth light transmission film is in a preset range; the third light transmission film is arranged on the second light transmission film, and the fourth light transmission film abuts against an inner side of the surface layer light transmission film.

[0022] The utility model discloses the following technical effects are obtained relative to the prior art:

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

[0024] The other technical solutions of the utility model obtain the following technical effects:

[0025] 2. 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 reflection layer and the substrate layer are arranged in the dissipating speckle screen from outside to inside, so that the high and low refractive indexes are arranged alternately in the direction from outside to inside of the screen, and then the light can be refracted multiple times in the high and low refractive indexes in the transmission process, the multiple medium reflection is formed, the transmission angle of the light is changed, the incidence angle and the exit angle of the projection light are diversified, the visual angle is improved, the optical path difference of the polarized light is changed, the polarization of the light can be effectively eliminated, the coherence of the light source can be reduced, and the laser speckle is inhibited.

[0026] 3. The number of layers in the outer light transmission module can be selected, when the outer light transmission module only includes the PET layer, the flexible dissipating speckle screen is formed, and the light transmission rate is good. When the outer light transmission module includes the second PET film layer, the TPU film layer and the first PET film layer arranged in layers, the dissipating speckle effect can be further increased, and the hardness of the screen is increased, and the hard dissipating speckle screen is formed. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor under the premise of the drawings.

[0028] Fig. 1 It is a whole schematic view of the dissipating speckle screen of the present application.

[0029] Fig. 2 It is a whole schematic view of another speckle screen of the present application.

[0030] Among them, 1, the substrate layer; 2, the metal reflection layer;

[0031] 3, the inner light transmission module; 31, the first AG film layer;

[0032] 4, the outer light transmission module; 41, the first PET film layer; 42, the TPU film layer; 43, the second PET film layer; 44, the third PET film layer;

[0033] 5, the surface layer; 51, the second AG film layer;

[0034] 61, the first SIO2 layer; 62, the second SIO2 layer. DETAILED DESCRIPTION

[0035] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts are within the scope of the present application.

[0036] In order to make the above-mentioned purposes, features and advantages of the present application more apparent, the present application will be described in further detail below with reference to the drawings and specific embodiments.

[0037] Embodiment one:

[0038] Please refer to Figs. 1-2 In the embodiment, a dissipating spot silver screen is provided, which comprises a substrate layer 1, a metal reflection layer 2, an inner layer light transmission module 3, an outer layer light transmission module 4 and a surface layer 5 which are sequentially stacked from inside to outside. The surface of the substrate layer 1 has a concave-convex structure, and the metal reflection layer 2 is directly attached to the concave-convex structure. The shape of the metal reflection layer 2 matches the shape of the concave-convex structure, i.e. the surface of the metal reflection layer 2 also has a concave-convex shape, and the concave-convex shape of the metal reflection layer 2 is parallel to the concave-convex structure on the surface of the substrate layer 1. The inner layer light transmission module 3 comprises a first inner layer light transmission area and a second inner layer light transmission area, and the first inner layer light transmission area is attached to the metal reflection layer 2. Preferably, the surface of the first inner layer light transmission area is the inner side surface of the inner layer light transmission module 3, and the surface of the second inner layer light transmission area is the outer side surface of the inner layer light transmission module 3. The outer layer light transmission module 4 comprises a first outer layer light transmission area and a second outer layer light transmission area. Preferably, the surface of the first outer layer light transmission area is the inner side surface of the outer layer light transmission module 4, and the surface of the second outer layer light transmission area is the outer side surface of the outer layer light transmission module 4. The first outer layer light transmission area is attached to the second inner layer light transmission area, and the difference between the refractive index of the first outer layer light transmission area and the refractive index of the second inner layer light transmission area is less than a first preset threshold. The second outer layer light transmission 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 layer light transmission area is less than a second preset threshold. Preferably, the first preset threshold and the second preset threshold are both 0.3.

[0039] The working principle is that light is incident on the surface layer 5, is refracted on the surface layer 5, and when the light enters the second outer light-transmitting area from the surface layer 5, the light is refracted again as expected due to the difference between the refractive index of the surface layer 5 and the refractive index of the second outer light-transmitting area being less than a second preset threshold, and then the light is incident on the inner light-transmitting module 3 from the outer light-transmitting module 4, at this time, the light is refracted again as expected when the light is incident on the second inner light-transmitting area from the first outer light-transmitting area due to the difference between the refractive index of the first outer light-transmitting area and the refractive index of the second inner light-transmitting area being less than a first preset threshold; and then the light is incident on the metal reflecting layer 2 from the inner light-transmitting module 3, the light is reflected by the metal reflecting layer 2, and after multiple refractions, the light is emitted from the surface layer 5 and can be received by the human eye. Due to the difference in refractive index between the surface layer 5 and the outer light-transmitting module 4 and the difference in refractive index 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 multiple medium reflection, changing the transmission angle of the light, making the incident angle and the exit angle of the projection light diversified, 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 the 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 media with high and low refractive indices are arranged alternately, so that the light can be transmitted in the media with high and low refractive indices alternately, and the light is refracted multiple times in 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 the second AG film layer 51 is attached with UV light curing glue. Preferably, the outer surface of the second AG film layer 51 is corrugated or has a concave-convex structure. This can make the surface of the speckle-eliminating screen rough, reducing the phenomenon of glare. The first AG film layer 31 is also attached with UV light curing glue.

[0042] In the embodiment, 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 sequentially stacked from inside to outside. The first outer light-transmitting area is arranged on the first PET film layer 41, and the inner side surface of the first outer light-transmitting area is the inner side surface of the first PET film layer 41. The inner side surface of the first PET film layer 41 is directly attached to the first AG film layer 31. The inner and outer surfaces of the TPU film layer 42 are attached 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 attached to the second AG film layer 51. 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 dissipation speckle 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 reflection layer 2 and the substrate layer 1 are sequentially stacked from outside to inside. A hard dissipation speckle screen is formed, and the refractive index is alternately arranged from high to low with the change of the medium from outside to inside, and the refractive index difference of adjacent media is within a predetermined range. The refractive index difference forms a multi-medium reflection, changes the optical path difference of polarized light, effectively eliminates the polarization of light, and weakens the laser speckle.

[0044] In the 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, 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 and 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 is between 1.5 and 1.9; and 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 two adjacent sides is less than or equal to 0.3.

[0045] In the embodiment, the metal reflection layer 2 is an AL layer, i.e. an aluminum layer. The AL layer is attached with an SIO2 layer, i.e. a silicon dioxide layer, and the SIO2 layer comprises a first SIO2 layer 61 and a second SIO2 layer 62. Preferably, a mixed film of silicon dioxide and aluminum is formed on the substrate layer 1, and the mixed film of silicon dioxide and aluminum comprises the AL layer and the SIO2 layer. The mixed film of silicon dioxide and aluminum has good reflection performance.

[0046] In an embodiment, the outer light-transmitting module 4 only includes the third PET film layer 44, i.e., 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 side surface of the third PET film layer 44 is attached to the first AG film layer 31; and the outer side surface of the third PET film layer 44 is attached to the second AG film layer 51. The refractive index of the third PET film layer 44 is also between 1.2-1.6, 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 softness of the whole diffused spot screen formed thereby is better, forming a flexible diffused spot screen. Moreover, the thickness of the whole is smaller, and the light-transmitting rate is increased.

[0047] In an embodiment, the thicknesses 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 a silicone material.

[0048] Embodiment two:

[0049] The embodiment provides a manufacturing method of a diffused spot screen, which applies the diffused spot screen in embodiment one; and includes the following steps:

[0050] S1, a recess of a preset size is processed on the substrate layer 1, so as to form a concave-convex structure on the substrate layer 1;

[0051] S2, a metal reflection layer 2 is attached on the concave-convex structure, which can be formed in a spraying manner, and the shape of the metal reflection layer 2 matches the concave-convex structure;

[0052] S3, the first light-transmitting film is selected as the inner light-transmitting module 3; the first light-transmitting film is attached on the metal reflection layer 2; the first light-transmitting film can be the first AG film layer 31; and the attachment manner of the first AG film layer 31 on the metal reflection layer 2 can be adaptively selected according to actual conditions;

[0053] S4, the second light-transmitting film in the outer light-transmitting module 4 is selected, which 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; and the second light-transmitting film is attached on the first light-transmitting film;

[0054] S5, the surface light-transmitting film in the surface layer 5 is selected 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 the surface light-transmitting film is attached to the second light-transmitting film.

[0055] S6, a corrugated or concave-convex structure is processed 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 inhibited, the silver screen has good flexibility, the light transmittance is better, and the flexible speckle-eliminating silver screen is formed.

[0056] In the embodiment, between the step S4 and the step S5, the third light-transmitting film and the fourth light-transmitting film in the outer light-transmitting module 4 are 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 the TPU film layer 42, and the fourth light-transmitting film can be the 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, the rigid speckle-eliminating silver screen is formed, 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, the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0058] The principle and implementation mode of the present application are described by applying specific examples in the present application, and the above embodiment description is only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed. In conclusion, the content of the present application should not be understood as a limitation of the present application.

Claims

1. A diffusion screen for a projection screen, characterized in that The substrate layer (1), the metal reflection layer (2), the inner light transmission module (3), the outer light transmission module (4) and the surface layer (5) are sequentially stacked; The surface of the substrate layer (1) comprises a concave-convex structure, and the shape of the metal reflection layer (2) matches the concave-convex structure; The inner light transmission module (3) comprises a first inner light transmission area and a second inner light transmission area, and the first inner light transmission area abuts against the metal reflection layer (2); The outer light transmission module (4) comprises a first outer light transmission area and a second outer light transmission area, the first outer light transmission area is attached to the second inner light transmission area, the difference between the refractive index of the first outer light transmission area and the refractive index of the second inner light transmission area is less than a first preset threshold, the second outer light transmission area abuts against 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 transmission area is less than a second preset threshold.

2. The dissipative screen of claim 1, wherein, The refractive index of the surface layer (5) is greater than the refractive index of the second outer light transmission area, and the refractive index of the first outer light transmission area is less than the refractive index of the second inner light transmission area.

3. The dissipative screen of claim 1, wherein, The inner light transmission module (3) comprises a first AG film layer (31), and the first inner light transmission area and the second inner light transmission area are 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 attached to the second outer light transmission area.

4. The dissipative screen of claim 3, wherein, The outer light transmission module (4) comprises a first PET film layer (41), a TPU film layer (42) and a second PET film layer (43) which are sequentially stacked, the first outer light transmission area is arranged on the first PET film layer (41), and the second outer light transmission area is arranged on the second PET film layer (43); the refractive index of the first PET film layer (41) and the second PET film layer (43) is less than the refractive index of the TPU film layer (42).

5. The dissipative screen of claim 4, wherein, The refractive index of the first PET film layer (41) and the second PET film layer (43) is 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 dissipative screen of claim 3 wherein, The outer light transmission module (4) is composed of a third PET film layer (44), and the first outer light transmission area and the second outer light transmission area are arranged on the third PET film layer (44).

7. The dissipative screen of claim 3 wherein, The refractive index of the first AG film layer (31) and the second AG film layer (51) is between 1.5 and 1.

9.

8. The dissipative screen of claim 4 wherein, The thickness of the first PET film layer (41), the TPU film layer (42) and the second PET film layer (43) is 0.05 mm.

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