WO2020125610A1 - 一种投影屏幕和投影系统 - Google Patents

一种投影屏幕和投影系统 Download PDF

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Publication number
WO2020125610A1
WO2020125610A1 PCT/CN2019/125890 CN2019125890W WO2020125610A1 WO 2020125610 A1 WO2020125610 A1 WO 2020125610A1 CN 2019125890 W CN2019125890 W CN 2019125890W WO 2020125610 A1 WO2020125610 A1 WO 2020125610A1
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Prior art keywords
layer
projection
projection screen
light
concentrating
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PCT/CN2019/125890
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English (en)
French (fr)
Inventor
王超
钟强
郭好磊
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青岛海信激光显示股份有限公司
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Publication of WO2020125610A1 publication Critical patent/WO2020125610A1/zh

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/48—Laser speckle optics

Definitions

  • the present application relates to the field of projection screens, in particular to a projection screen and a projection system.
  • “Speckle” is also called “laser speckle”. Speckle phenomenon is common in the process of optical imaging. Due to the high coherence of laser, the phenomenon of laser speckle is more obvious. Laser speckle is the diffuse reflection of laser light from the surface of the scatterer or through a transparent scatterer (such as frosted glass). An irregularly distributed bright and dark spot can be observed in the light field on or near the scattering surface. In laser projection technology, because the laser needs to pass through the projection lens of the projector, and the projection lens is a transparent scatterer, the laser beam emitted through the projection lens will have a speckle problem when it is projected onto the projection screen. At present, the most serious speckle is in the RGB three-color laser light source. Because the three lasers have coherence, the appearance of speckle has a lot to do with the coherence of the laser. Therefore, although the RGB laser light source is the most advanced, the speckle problem The solution is the most difficult.
  • the speckle severity of the two-color laser light source is weaker than that of the three-color laser light source, and the speckle severity of the monochromatic laser light source is weaker than that of the two-color laser light source, although the laser projection screen currently in use is
  • the speckle of the light source has a certain suppression effect, and the user will basically not notice the speckle problem during use; but when the three-color laser light source used by the laser projection light source, its ability to suppress speckle is relatively poor, the user is in It is easy to notice the speckle problem when watching, which seriously affects the user experience.
  • the embodiments of the present application provide a projection screen and a projection system, which can better suppress the occurrence of speckle on the basis of ensuring the image resolution of the projected image.
  • a projection screen for reflecting a projection beam of a projector; in the reflection direction of the projection beam, the projection screen includes a light-concentrating layer provided on the light exit side of the colored layer, and a light-concentrating layer The surface scattering layer on the light exit side of the layer;
  • the light-concentrating layer is used to converge the projection light beam emitted from the colored layer
  • the roughness of the side of the surface scattering layer away from the light-concentrating layer is greater than or equal to the preset roughness
  • the surface scattering layer is used to scatter the projected light beam condensed by the light-concentrating layer and then enter the human eye outside the projection screen.
  • a projection system which includes a projector and the projection screen as provided in the first aspect, wherein the projector is used to emit a projection beam to the projection screen, and the projection beam includes a laser beam.
  • the projection screen and the projection system provided by the embodiments of the present application.
  • the projection screen includes, in the reflection direction of the projection light beam, a light-concentrating layer provided on the light-emitting side of the colored layer, and a surface scattering layer provided on the light-emitting side of the light-concentrating layer; Among them, the light-concentrating layer is used to converge the projection beam emitted from the coloring layer; the roughness of the side of the surface scattering layer away from the light-concentrating layer is greater than or equal to the preset roughness; the surface scattering layer is used to scatter the converging projection beam of the light-concentrating layer Afterwards, it enters the human eye outside the projection screen.
  • the reflected projection beam will have a higher degree of scattering, and the higher the degree of scattering, the greater It has a better effect of dispersing the speckle existing in the projection beam, which also better suppresses the appearance of speckle and improves the experience of users who use the projection screen.
  • a light-concentrating layer is further provided on the side of the surface scattering layer close to the coloring layer, which is used to project the projection beam emitted from the coloring layer, ie, the projection screen.
  • the reflected projection beams converge, converge the angle of the projection beam, increase the projection screen gain, and reduce the size of the projected image to achieve the purpose of improving resolution, thereby counteracting the reduced gain of the projection screen and the reduction of the projected image caused by the surface scattering layer Resolution.
  • the technical solution provided by the embodiments of the present application can better suppress the occurrence of speckle phenomenon on the basis of ensuring the imaging of the projection screen is clear.
  • Figure 1 is a schematic diagram of the structure of a laser projection screen provided by the related art
  • FIG. 2 is a schematic structural diagram of a projection screen provided by an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of another projection screen provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a convergence structure layer provided by an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of yet another projection screen provided by an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a projection system provided by an embodiment of the present application.
  • the words “first” and “second” are used to distinguish the same or similar items with basically the same functions and functions.
  • the skilled person can understand that the words “first” and “second” are not limiting the number and order of execution.
  • the laser projection screen 10 in the related art is provided with a hard cover layer HardCoat Layer 11, a coloring layer Tint Layer 12, a diffusion layer Diffuser Layer 13, a Fresnel projection layer Fresnel lens 14 and a reflective layer in order along the incident direction of the projection beam Reflective layer 15; the projection beam incident on the laser projection screen is reflected to the Fresnel lens layer 14 through the reflective layer 15, and the Fresnel lens layer 14 uniformly focuses the projection beam and emits it to the diffusion layer 13, the diffusion layer 13 is The projection beam is diffused and emitted to the coloring layer 12, and the coloring layer 12 removes the background light from the projection beam and emits it to the hard mask layer 11, because the light emitting side of the hard mask layer 11 has a certain roughness, so the projection beam After scattering through the hard mask layer, the speckles possessed by the projection beam itself will be scattered to suppress the speckle phenomenon of the image formed on the projection screen.
  • the current laser projection screen requires certain limits to ensure its forming clarity, so the scattering ability of the hard cover layer needs to be subject to certain restrictions.
  • the roughness of its light exit surface is smarter than the preset roughness.
  • the projection screen is only for monochrome
  • the speckle of the laser light source or the two-color laser light source has a certain effect of suppressing speckle, and its RGB tricolor laser light source with a higher degree of coherence and more speckle phenomenon does not have a good effect of suppressing speckle, which will affect the user's use. .
  • an embodiment of the present application provides a projection screen 20 that is used to reflect the projection beam of a projector; in the reflection direction of the projection beam, the projection screen 20 includes a light exit side disposed on the coloring layer 21 The light condensing layer 22, and the surface scattering layer 23 disposed on the light emitting side of the light concentrating layer 22;
  • the light-concentrating layer 22 is used to converge the projection beam emitted from the coloring layer 21;
  • the roughness of the surface of the surface scattering layer 23 away from the light-concentrating layer 22 is greater than or equal to the preset roughness; the surface scattering layer 23 is used to scatter the projected light beam condensed by the light-concentrating layer 22 and enter the human eye outside the projection screen.
  • the preset roughness may be 0.5 ⁇ m, that is, the roughness Ra value of the side of the surface scattering layer provided by the embodiment of the present application away from the light-concentrating layer is ⁇ 0.5um.
  • the projection screen provided by the above embodiment has a surface scattering layer with a roughness greater than or equal to a preset roughness on the light exit side of the projection screen.
  • the surface roughness of the projection screen is larger, the reflected projection beam will be scattered more , And the higher the degree of scattering, the better the effect of dispersing the speckles in the projection beam, and the better the suppression of the speckle phenomenon, which improves the experience of users using projection screens.
  • a light-concentrating layer is further provided on the side of the surface scattering layer close to the coloring layer, which is used to project the projection beam emitted from the coloring layer, that is, the projection screen.
  • the reflected projection beams converge, converge the angle of the projection beam, increase the projection screen gain, and reduce the size of the projected image to achieve the purpose of improving resolution, thereby counteracting the reduced gain of the projection screen and the reduction of the projected image caused by the surface scattering layer Resolution.
  • the technical solution provided by the embodiments of the present application can better suppress the occurrence of speckle phenomenon on the basis of ensuring the imaging of the projection screen is clear.
  • the surface scattering layer 23 includes a first substrate 231 and a surface coating layer 232 disposed on a side of the first substrate 231 away from the light-concentrating layer 22;
  • the material of the first substrate 231 may be PET (Polyethylene Terephthalate), and the material of the surface coating layer 232 may be shadowless glue (UV glue) );
  • the roughness of the surface of the surface coating layer 232 away from the first substrate 231 is greater than or equal to the preset roughness
  • the surface coating layer 232 is used to scatter the projection beam emitted from the surface of the first substrate 231 close to the surface coating layer 232 and then enter the human eye outside the projection screen;
  • the surface coating layer 232 is made on the first substrate 231 using a shadowless glue using a roller imprint process.
  • the light-concentrating layer 22 includes a second substrate 221 and a converging structure layer 222 disposed on a side of the second substrate 221 away from the colored layer 21;
  • the converging structure layer 222 includes at least two converging structures, and the at least two converging structures are arranged in parallel on the side of the second substrate 221 away from the reflective layer 26;
  • the material of the second substrate 221 may be PET, and the material of the converging structure layer 222 may be shadowless glue (UV glue);
  • the condensing structure is used to converge the projection light beam emitted from the side of the second substrate 221 close to the condensing structure layer 222;
  • the converging structure includes but is not limited to any one of the following: triangular prism, cylindrical, zigzag prism; when the condensing structure is a prism, the specific structure of the converging structure layer 222 is shown in FIG. 4, when the light beam is from the second base When the material is incident and the converging structure layer exits, each converging structure can be converged by the light beam according to the principle of refraction.
  • the convergence structure layer 222 is made on the second base material 221 by using a shadowless stamping process using shadowless glue.
  • the projection screen provided by the embodiment of the present application further includes: a diffusion layer 24, a Fresnel lens layer 25, and a reflection layer 26;
  • the diffusion layer 24 is disposed on the side of the colored layer 21 away from the light-concentrating layer 22;
  • the diffusion layer 24 includes at least two scattering particles, and the material of the scattering particles includes organic glass;
  • the Fresnel lens layer 25 is disposed on the side of the diffusion layer 24 away from the colored layer 21;
  • the reflective layer 26 is provided on the side of the Fresnel lens layer 25 away from the diffusion layer 24.
  • the colored layer 23 is specifically used to filter out background light other than the projected light beam in practice to ensure the imaging quality, and its material may be an MS board (made of polymethyl methacrylate (PMMA, Polymethyl Methacrylate) and 50% benzene) (Polystyrene (PS) is a copolymer synthesized as the main raw material), and the portion other than the scattering particles in the diffusion layer 24 is the same as the material used for the coloring layer 23.
  • MS board made of polymethyl methacrylate (PMMA, Polymethyl Methacrylate) and 50% benzene
  • PS Polystyrene
  • the portion other than the scattering particles in the diffusion layer 24 is the same as the material used for the coloring layer 23.
  • the colored layer 21, the light-concentrating layer 22 and the surface scattering layer 23 are pasted and fixed by using a transparent optical adhesive 27; meanwhile, in order to ensure the light-concentrating layer 22 To achieve the refraction of the optical fiber, the air-concentrating layer 22 must have an air layer on the side close to the surface scattering layer 23.
  • the projection screen includes a light-concentrating layer disposed on the light-exiting side of the colored layer and a surface scattering layer disposed on the light-emitting side of the light-concentrating layer in the reflection direction of the projected light beam;
  • the light layer is used to converge the projection light beam emitted from the coloring layer;
  • the roughness of the side of the surface scattering layer far away from the light concentrating layer is greater than or equal to the preset roughness;
  • the surface scattering layer is used to scatter the projected light beam condensed by the light concentrating layer and enter To the human eye outside the projection screen.
  • a light-concentrating layer is further provided on the side of the surface scattering layer close to the coloring layer, for converging and converging the projection light beam emitted from the coloring layer, that is, the projection light
  • an embodiment of the present application further provides a projection system, including a projector 61 and the projection screen 62 provided in the foregoing embodiment, wherein the projector 61 is used to emit a projection beam to the projection screen 62, the projection The light beam includes a laser beam.
  • an embodiment of the present application further provides a projection system, including a projection device 61 and the projection screen 62 provided in the foregoing embodiment, wherein the projection device 61 is used to emit a projection beam to the projection screen 62, the projection beam includes Laser beam.
  • the projection device 61 is an ultra-short throw projection device.
  • the inside includes: a laser light source, which is used to provide an illumination beam.
  • the laser light source is a pure three-color laser light source that emits red laser, blue laser, and green laser; an optical machine is used to modulate the illumination beam, and Projecting the modulated illumination beam into the projection lens; and, the projection lens is used to image the modulated illumination beam, wherein the projection lens is an ultra-short throw projection lens, which is used to illuminate the projection screen 62 obliquely upward and project
  • the screen 62 specifically the Fresnel optical screen in the foregoing example, has a higher gain value and better restores the brightness of the image screen.
  • the projection screen 62 receives the laser beam and has a better image frame formed by the laser beam. The effect of speckle suppression.
  • the projection system provided by the embodiments of the present application adopts the projection screen provided by the foregoing embodiments, the generation of speckle phenomenon can be better suppressed on the basis of ensuring the image quality of the projected image.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Projection Apparatus (AREA)

Abstract

一种投影屏幕（20,62）和投影系统，该投影屏幕（20,62）用于反射投影仪（61）的投影光束，在投影光束的反射方向上，投影屏幕（20,62）包括设置于着色层（21）的出光侧的聚光层（22），以及设置于聚光层（22）的出光侧的表面散射层（23）；其中，聚光层（22）用于将着色层（21）出射的投影光束进行会聚；表面散射层（23）远离聚光层（22）的一面的粗糙度大于等于预设粗糙度；表面散射层（23）用于将聚光层（22）会聚的投影光束散射后，入射至投影屏幕（20,62）外的人眼。

Description

一种投影屏幕和投影系统
本申请要求于2018年12月20日提交中国专利局、申请号为201811562170.3、申请名称为“一种投影屏幕和投影系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及投影屏幕领域，尤其涉及一种投影屏幕和投影系统。
背景技术
“散斑”又称“激光散斑”。散斑现象普遍存在于光学成像的过程中，由于激光的高度相干性，激光散斑的现象就更加明显。激光散斑是激光自散射体的表面漫反射或通过一个透明散射体(例如毛玻璃)时，在散射表面或附近的光场中可以观察到一种无规则分布的亮暗斑点。在激光投影技术中，因为激光需要透过投影仪的投影镜头，而投影镜头就是一个透明散射体，所以透过该投影镜头出射的激光光束在投影到投影屏幕上时，会出现散斑问题。目前散斑最严重的是RGB三色激光光源中，因为三种激光都有相干性，而散斑的出现和激光的相干性有很多的关系，因此虽然RGB激光光源最先进，但是散斑问题的解决却是最难的。
因为双色激光光源的散斑严重程度弱于三色激光光源，而单色激光光源的散斑严重程度又弱于双色激光光源，所以虽然目前在使用的激光投影屏幕对双色激光光源和单色激光光源的散斑有一定的抑制作用，用户在使用中也基本不会察觉散斑问题；但是当激光投影光源使用的三色激光光源时，其抑制散斑的能力就相对差了很多，用户在观看时容易察觉散斑问题，严重影响用户体验。
发明内容
本申请的实施例提供一种投影屏幕和投影系统，能够在保证投影图像的图像解析度的基础上，更好的抑制散斑现象的出现。
为达到上述目的，本申请的实施例采用如下技术方案：
第一方面，提供一种投影屏幕，该投影屏幕用于反射投影仪的投影光束；在投影光束的反射方向上，投影屏幕包括设置于着色层的出光侧的聚光层，以及设置于聚光层的出光侧的表面散射层；
其中，聚光层用于将着色层出射的投影光束进行会聚；
表面散射层远离聚光层的一面的粗糙度大于等于预设粗糙度；
表面散射层用于将聚光层会聚的投影光束散射后，入射至投影屏幕外的人眼。
第二方面，提供一种投影系统，包括投影仪以及如第一方面提供的投影屏幕，其中投影仪用于向投影屏幕发射投影光束，该投影光束包括激光光束。
本申请实施例提供的投影屏幕和投影系统，该投影屏幕在投影光束的反射方向上，包括设置于着色层的出光侧的聚光层，以及设置于聚光层的出光侧的表面散射层；其中，聚光层用于将着色层出射的投影光束进行会聚；表面散射层远离聚光层的一面的粗糙度大于等于预设粗糙度；表面散射层用于将聚光层会聚的投影光束散射后，入射至投影屏幕外的人眼。
因为该投影屏幕的出光侧存在粗糙度大于等于预设粗糙度的表面散射层，当投影屏幕的表面粗糙度越大时其反射的投影光束也就散射程度越高，而散射程度越高则就对投影光束中存在的散斑具有更好的打散效果，也就更好的抑制了散斑现象的出现，提高了使用投影屏幕的用户的体验度。
但是如果仅仅只增加投影屏幕的粗糙度，虽然会更好抑制散斑的产生，但是因为其粗糙表面对投影光束的打散效果，使得投影屏幕本身的增益和解析度都会下降也就是投影的投影图像模糊分辨率降低，所以为了避免这一点，本申请实施例提供的技术方案中还在表面散射层靠近着色层的一侧设置有聚光层，用于对着色层出射的投影光束即投影屏幕反射的投影光束进行会聚，收聚投影光束的角度，增大投影屏幕增益的同时，减小投影图像尺寸以达到 提高解析度的目的，从而抵消表面散射层造成投影屏幕降低的增益和投影图像降低的解析度。
因此，本申请实施例提供的技术方案，可以在保证投影屏幕成像清晰的基础上，更好的抑制散斑现象的出现。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为相关技术提供的激光投影屏幕结构示意图；
图2为本申请实施例提供的一种投影屏幕的结构示意图；
图3为本申请实施例提供的另一种投影屏幕的结构示意图；
图4为本申请实施例提供的会聚结构层的结构示意图；
图5为本申请实施例提供的又一种投影屏幕的结构示意图；
图6为本申请实施例提供的一种投影系统的结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
需要说明的是，本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
还需要说明的是，本申请实施例中，“的(英文：of)”，“相应的(英文：corresponding，relevant)”和“对应的(英文：corresponding)”有时可以混用，应当指出的是，在不强调其区别时，其所要表达的含义是一致的。
为了便于清楚描述本申请实施例的技术方案，在本申请的实施例中，采用了“第一”、“第二”等字样对功能和作用基本相同的相同项或相似项进行区分，本领域技术人员可以理解“第一”、“第二”等字样并不是在对数量和执行次序进行限定。
参照图1所示，相关技术中的激光投影屏幕10，沿投影光束的入射方向依次设置有硬罩层HardCoat Layer11、着色层Tint Layer12、扩散层Diffuser Layer13、菲涅尔投影层Fresnel lens14和反射层Reflective layer15；入射进激光投影屏幕的投影光束，经由反射层15反射到菲涅尔透镜层14，菲涅尔透镜层14将该投影光束进行均匀聚焦后发射到扩散层13，扩散层13则对该投影光束进行扩散后发射到着色层12，着色层12对该投影光束去除背景光后，发射到硬罩层11，因为硬罩层11出光侧的一面是具备一定粗糙度的，所以投影光束在经由硬罩层散射后，会将投影光束本身具备的散斑进行打散，抑制了投影屏幕上成像的散斑现象。
但是目前的激光投影屏幕，因为要保证其成型清晰度的要求，所以硬罩层的散射能力需要收到一定的限制，其出光面的粗糙度智能小于预设粗糙度，投影屏幕只针对单色激光光源或双色激光光源的散斑具备一定的抑制散斑作用，而其对于相干程度更高，散斑现象更严重的RGB三色激光光源则不具备良好的抑制散斑作用，会影响用户使用。
参照图2所示，本申请实施例提供一种投影屏幕20，该投影屏幕20用于反射投影仪的投影光束；在投影光束的反射方向上，投影屏幕20包括设置于着色层21的出光侧的聚光层22，以及设置于聚光层22的出光侧的表面散射层23；
其中，聚光层22用于将着色层21出射的投影光束进行会聚；
表面散射层23远离聚光层22的一面的粗糙度大于等于预设粗糙度；表 面散射层23用于将聚光层22会聚的投影光束散射后，入射至投影屏幕外的人眼。
示例性的，预设粗糙度可以为0.5μm，即本申请实施例提供的表面散射层远离聚光层的一面的粗糙度Ra值≥0.5um。
上述实施例提供的投影屏幕，因为该投影屏幕的出光侧存在粗糙度大于等于预设粗糙度的表面散射层，当投影屏幕的表面粗糙度越大时其反射的投影光束也就散射程度越高，而散射程度越高则就对投影光束中存在的散斑具有更好的打散效果，也就更好的抑制了散斑现象的出现，提高了使用投影屏幕的用户的体验度。
但是如果仅仅只增加投影屏幕的粗糙度，虽然会更好抑制散斑的产生，但是因为其粗糙表面对投影光束的打散效果，使得投影屏幕本身的增益和解析度都会下降也就是投影的投影图像模糊分辨率降低，所以为了避免这一点，本申请实施例提供的技术方案中还在表面散射层靠近着色层的一侧设置有聚光层，用于对着色层出射的投影光束即投影屏幕反射的投影光束进行会聚，收聚投影光束的角度，增大投影屏幕增益的同时，减小投影图像尺寸以达到提高解析度的目的，从而抵消表面散射层造成投影屏幕降低的增益和投影图像降低的解析度。
因此，本申请实施例提供的技术方案，可以在保证投影屏幕成像清晰的基础上，更好的抑制散斑现象的出现。
具体可选的，参照图3所示，表面散射层23包括第一基材231和设置在第一基材231远离聚光层22的一面上的表面涂布层232；
示例性的，处于降低成本的考虑，第一基材231的材料可以是PET(Polyethylene Terephthalate，聚对苯二甲酸乙二醇酯)，表面涂布层232的材料可以是无影胶(UV胶)；
表面涂布层232远离第一基材231的一面的粗糙度大于等于预设粗糙度；
表面涂布层232用于将第一基材231靠近表面涂布层232的一面上出射的投影光束散射后，入射至投影屏幕外的人眼；
具体的，表面涂布层232使用无影胶采用辊轮压印工艺在第一基材231上制成。
具体可选的，参照图3所示，聚光层22包括第二基材221和设置在第二基材221远离着色层21的一面上的会聚结构层222；
会聚结构层222包括至少两个会聚结构，至少两个会聚结构平行排布在第二基材221远离反射层26的一面上；
示例性的，处于降低成本的考虑，第二基材221的材料可以是PET，会聚结构层222的材料可以是无影胶(UV胶)；
会聚结构用于将从第二基材221靠近会聚结构层222的一面出射的投影光束进行会聚；
示例性的，会聚结构包括但不限于以下任一种：三棱镜、柱形、锯齿形棱镜；当会聚结构为三棱镜时，会聚结构层222的具体结构参照图4所示，当光束从第二基材入射，会聚结构层出射时，根据折射原理每一个会聚结构都可以光束进行收聚。
具体的，会聚结构层222使用无影胶采用辊轮压印工艺在第二基材221上制成。
参照图2所示，本申请实施例提供的投影屏幕还包括：扩散层24、菲涅尔透镜层25和反射层26；
扩散层24设置在着色层21远离聚光层22的一面上；另外，扩散层24包括至少两个散射颗粒，散射颗粒的材料包括有机玻璃；
菲涅尔透镜层25设置在扩散层24远离着色层21的一面上；
反射层26设置在菲涅尔透镜层25远离扩散层24的一面上。
示例性的，着色层23具体用于滤除实际中除投影光束以外的背景光，保证成像质量，其材质可以为MS板(由聚甲基丙烯酸甲酯(PMMA，Polymethyl Methacrylate)和50％苯乙烯(PS，Polystyrene)为主要原料所合成的共聚物)，扩散层24中除散射颗粒以外的部分和着色层23使用的材料相同。
可选的，以会聚结构为三棱镜为例，参照图5中所示，着色层21、聚光 层22和表面散射层23之间使用透明光学胶27粘贴固定；同时，为了保证聚光层22实现对光纤的折射，聚光层22靠近表面散射层23的一面上必须留有空气层。
本申请实施例提供的投影屏幕，该投影屏幕在投影光束的反射方向上，包括设置于着色层的出光侧的聚光层，以及设置于聚光层的出光侧的表面散射层；其中，聚光层用于将着色层出射的投影光束进行会聚；表面散射层远离聚光层的一面的粗糙度大于等于预设粗糙度；表面散射层用于将聚光层会聚的投影光束散射后，入射至投影屏幕外的人眼。
因为该投影屏幕的出光侧存在粗糙度大于等于预设粗糙度的表面散射层，当投影屏幕的表面粗糙度越大时其反射的投影光束也就散射程度越高，而散射程度越高则就对投影光束中存在的散斑具有更好的打散效果，也就更好的抑制了散斑现象的出现，提高了使用投影屏幕的用户的体验度；但是如果仅仅只增加投影屏幕的粗糙度，虽然会更好抑制散斑的产生，但是因为其粗糙表面对投影光束的打散效果，使得投影屏幕本身的增益和解析度都会下降也就是投影的投影图像模糊分辨率降低，所以为了避免这一点，本申请实施例提供的技术方案中还在表面散射层靠近着色层的一侧设置有聚光层，用于对着色层出射的投影光束即投影屏幕反射的投影光束进行会聚，收聚投影光束的角度，增大投影屏幕增益的同时，减小投影图像尺寸以达到提高解析度的目的，从而抵消表面散射层造成投影屏幕降低的增益和投影图像降低的解析度。因此，本申请实施例提供的技术方案，可以在保证投影屏幕成像清晰的基础上，更好的抑制散斑现象的出现。
参照图6所示，本申请实施例还提供一种投影系统，包括投影仪61和上述实施例中提供的投影屏幕62，其中投影仪61用于向所述投影屏幕62发射投影光束，该投影光束包括激光光束。参照图6所示，本申请实施例还提供一种投影系统，包括投影设备61和上述实施例中提供的投影屏幕62，其中投影设备61用于向投影屏幕62发射投影光束，该投影光束包括激光 光束。
具体地，在本示例中，投影设备61为超短焦投影设备。其内部包括：激光光源，用于提供照明光束，在本示例中，激光光源为纯三色激光光源，发出红色激光，蓝色激光和绿色激光；光机，用于对照明光束进行调制，并将调制后的照明光束投射进入投影镜头；以及，投影镜头，用于对调制后的照明光束进行成像，其中，投影镜头为超短焦投影镜头，用于斜向上照射至投影屏幕62上，投影屏幕62具体地前述示例中的菲涅尔光学屏幕，具有较高的增益值，较好的还原图像画面的亮度，同时，投影屏幕62接收激光光束，能够对激光光束构成的图像画面具有较好的散斑抑制效果。
因为本申请实施例提供的投影系统中采用了前述实施例提供的投影屏幕，所以可以达到在保障投影图像的图像质量的基础上更好的抑制散斑现象的产生。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以权利要求的保护范围为准。

Claims (10)

  1. 一种投影屏幕，其特征在于，所述投影屏幕用于反射投影仪的投影光束；在所述投影光束的反射方向上，所述投影屏幕包括设置于着色层的出光侧的聚光层，以及设置于所述聚光层的出光侧的表面散射层；
    其中，所述聚光层用于将所述着色层出射的投影光束进行会聚；
    所述表面散射层远离所述聚光层的一面的粗糙度大于等于预设粗糙度；
    所述表面散射层用于将所述聚光层会聚的投影光束散射后，入射至所述投影屏幕外的人眼。
  2. 根据权利要求1所述的投影屏幕，其特征在于，所述表面散射层包括第一基材和设置在所述第一基材远离所述聚光层的一面上的表面涂布层；
    所述表面涂布层远离所述第一基材的一面的粗糙度大于所述预设粗糙度；
    所述表面涂布层用于将所述第一基材靠近表面涂布层的一面上出射的投影光束散射后，入射至所述投影屏幕外的人眼。
  3. 根据权利要求1所述的投影屏幕，其特征在于，所述聚光层包括第二基材和设置在所述第二基材远离所述着色层的一面上的会聚结构层；
    所述会聚结构层包括至少两个会聚结构，所述至少两个会聚结构平行排布在所述第二基材远离所述反射层的一面上；
    所述会聚结构用于将从所述第二基材靠近所述会聚结构层的一面出射的投影光束进行会聚。
  4. 根据权利要求1所述的投影屏幕，其特征在于，还包括：扩散层、菲涅尔透镜层和反射层；
    所述扩散层设置在所述着色层远离所述聚光层的一面上；
    所述菲涅尔透镜层设置在所述扩散层远离所述着色层的一面上；
    所述反射层设置在所述菲涅尔透镜层远离所述扩散层的一面上。
  5. 根据权利要求1所述的投影屏幕，其特征在于，所述着色层、所述聚光层和所述表面散射层之间使用透明光学胶粘贴固定。
  6. 根据权利要求2所述的投影屏幕，其特征在于，所述表面涂布层使用无影胶采用辊轮压印工艺在所述第一基材上制成。
  7. 根据权利要求3所述的投影屏幕，其特征在于，所述会聚结构层使用无影胶采用辊轮压印工艺在所述第二基材上制成。
  8. 根据权利要求3所述的投影屏幕，其特征在于，所述会聚结构包括以下任一种：三棱镜、柱形、锯齿形棱镜。
  9. 根据权利要求4所述的投影屏幕，其特征在于，所述扩散层包括至少两个散射颗粒，所述散射颗粒的材料包括有机玻璃。
  10. 一种投影系统，其特征在于，包括投影仪以及如权利要求1-8任一项所述的投影屏幕，其中所述投影仪用于向所述投影屏幕发射投影光束，所述投影光束包括激光光束。
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