WO2020007056A1 - 投影屏幕 - Google Patents

投影屏幕 Download PDF

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Publication number
WO2020007056A1
WO2020007056A1 PCT/CN2019/076624 CN2019076624W WO2020007056A1 WO 2020007056 A1 WO2020007056 A1 WO 2020007056A1 CN 2019076624 W CN2019076624 W CN 2019076624W WO 2020007056 A1 WO2020007056 A1 WO 2020007056A1
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Prior art keywords
layer
projection screen
thickness
reflective layer
light
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PCT/CN2019/076624
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English (en)
French (fr)
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张红秀
王霖
王杰
李屹
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深圳光峰科技股份有限公司
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Publication of WO2020007056A1 publication Critical patent/WO2020007056A1/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
    • G03B21/602—Lenticular screens
    • 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

Definitions

  • the invention relates to a projection screen, in particular to a projection screen with high contrast.
  • a projection system has been developed to achieve a large screen projection of more than 100 inches when the distance between the projector and the screen is 50 cm.
  • the projection system can overcome the limitation of installation space.
  • the image display on the projection screen usually has some problems.
  • the screen will reflect the ambient light, which will cause interference with the signal light, making it difficult to obtain a good Contrast.
  • patent documents KR1256594B1 and JP4047172 are both to selectively apply a light absorbing layer to a specific area of a Fresnel structure in a reflective screen. Absorbs ambient light in the same direction as the projected light, and the manufacturing method is complicated and the cost is high.
  • the technical problem to be solved by the present invention is to address the shortcomings of the prior art and provide a projection screen.
  • the thickness of the reflective layer in the projection screen By reducing the thickness of the reflective layer in the projection screen, the light transmittance of the reflective layer is increased, and no additional selection on the Fresnel structure layer is required.
  • the light-absorbing layer can be used to absorb the ambient light in all directions to achieve a high contrast effect; and the thickness of the reflective layer is reduced, which saves coating costs and reduces process difficulty and screen costs.
  • the invention provides a projection screen.
  • the projection screen includes a reflective layer, a Fresnel structure layer, and a substrate layer which are arranged in this order.
  • the thickness of the reflective layer is 7nm-25nm.
  • the projection screen is provided with a light absorbing layer on a side far from the incident side of the projection light.
  • a surface diffusion structure is provided on the outer surface of the substrate layer.
  • the projection screen further includes a diffusion layer provided on the incident side of the projection light, the diffusion layer is a bulk diffusion layer or a surface diffusion layer, and the diffusion layer and the substrate layer are bonded by setting a transparent adhesive. .
  • the projection screen includes a reflective layer, a Fresnel structure layer, and a substrate layer which are sequentially arranged along an incident direction of the projection light, and an outer surface of the reflective layer is provided with a surface diffusion structure, and the substrate layer is black.
  • the surface diffusion structure is a concave-convex structure, which is formed by sandblasting or photolithography; the thickness of the concave-convex structure along the direction normal to the surface on which it is located is 1 ⁇ m to 10 ⁇ m; The dimension parallel to the surface on which it is located is 2 ⁇ m to 40 ⁇ m.
  • the thickness of the concave-convex structure along the normal direction of the surface on which it is located is 3 ⁇ m-6 ⁇ m; the size of the concave-convex structure along the surface parallel to the surface is 6 ⁇ m-24 ⁇ m.
  • the thickness of the Fresnel structure layer is 10 ⁇ m to 100 ⁇ m.
  • the thickness of the reflective layer is 8nm-13nm.
  • the reflectivity of the reflective layer is 18% -50%, preferably 20% -30%.
  • the present invention increases the transmittance of the reflective layer by reducing the thickness of the reflective layer in the projection screen, and can additionally absorb ambient light in all directions without the need to selectively coat a light-absorbing layer on the Fresnel structure layer, thereby High contrast effect is achieved; and the thickness of the reflective layer is reduced, which saves coating costs and reduces process difficulty and screen costs.
  • FIG. 1 is a schematic diagram showing the relationship between the reflectivity of the reflective layer and the thickness of the reflective layer;
  • FIG. 2 is a schematic structural diagram of a projection screen according to a first embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a projection screen according to a second embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a projection screen according to a third embodiment of the present invention.
  • the invention provides a projection screen for reflecting projection light into the field of view of a viewer.
  • the projection screen includes a reflective layer, a Fresnel structure layer, and a substrate layer which are sequentially arranged.
  • the projection screen further includes a diffusion layer disposed on the incident side of the projected light.
  • the projection screen is provided with a light absorbing layer on a side remote from the incident side.
  • the reflective layer is an aluminum reflective layer, a silver reflective layer, or the like, which can be prepared by a vacuum coating method such as magnetron sputtering or evaporation.
  • the Fresnel structure layer is formed by a roll-to-roll process and a photosensitive adhesive is cured.
  • the substrate layer may be made of transparent polymers such as PET (polyethylene terephthalate), PC (polycarbonate), PVC (polyvinyl chloride), PMMA (polymethyl methacrylate), and the like.
  • PET polyethylene terephthalate
  • PC polycarbonate
  • PVC polyvinyl chloride
  • PMMA polymethyl methacrylate
  • the diffusion layer may be a bulk diffusion layer or a surface diffusion layer, and is preferably a surface diffusion layer.
  • the bulk diffusion layer contains bulk scattering particles; one surface of the surface diffusion layer has a surface diffusion structure.
  • the light absorbing layer is used for absorbing ambient light transmitted through the reflective layer to improve image contrast, such as carbon black and aniline black.
  • FIG. 1 is a schematic diagram showing the relationship between the thickness of the reflective layer and the reflectivity.
  • the reflective layer in FIG. 1 uses an aluminum reflective layer.
  • the reflectance and transmittance of the aluminum film are basically stable, and when the thickness of the aluminum film is less than 55 nm, the aluminum
  • the reflectivity of the film decreases as the thickness of the aluminum film decreases, and the transmittance increases as the thickness of the aluminum film decreases. That is, the reflectivity of the projection screen can be controlled by changing the thickness of the reflective layer.
  • Table 1 shows the optical parameters of the projection screen corresponding to different thicknesses of the reflective layer.
  • the reflectivity, gain, and contrast of the projection screen are comprehensively considered.
  • the reflectivity of the reflective layer is 18% -50%, and the thickness of the reflective layer is 7nm-25nm.
  • the reflectivity is 20% -30%, the thickness of the reflective layer is 8nm-13nm.
  • FIG. 2 is a schematic structural diagram of a projection screen according to a first embodiment of the present invention.
  • the projection screen includes a diffusion layer 101, a substrate layer 102, a Fresnel structure layer 103, a reflection layer 104, and a light absorption layer which are sequentially arranged along an incident direction of the projection light. 105.
  • the diffusion layer 101 is a surface diffusion layer, and one surface of the surface diffusion layer has a microstructure (surface diffusion structure), and the surface of the surface diffusion layer without the microstructure is transparent to the substrate layer 102 (transparent PET).
  • Adhesive is adhered, and a photosensitive adhesive (such as a UV curing adhesive) is coated on the side of the substrate layer 102 away from the diffusion layer 101.
  • the thickness of the photosensitive adhesive is 10 ⁇ m to 100 ⁇ m, and preferably 20 ⁇ m to 50 ⁇ m.
  • the Fresnel structure is transferred to the surface of the photoresist-coated base material layer 102 by a roll-to-roll process, and cured by a UV curing process to form a Fresnel structure layer 103 having a thickness of 10 ⁇ m to 100 ⁇ m.
  • UV curing are mature processes, the specific process parameters are not described.
  • an aluminum reflective layer is used as the reflective layer 104.
  • a roll with Fresnel structure (composed of a diffusion layer 101, a substrate layer 102, and a Fresnel structure layer 103) was placed in a roll-to-roll vacuum evaporation coating machine, and the vacuum was evacuated by a vacuum pump to a vacuum degree of 10 -3 Pa-10 -4 Pa, heating the aluminum wire at a heating temperature of 1200 ° C to 1300 ° C to melt and evaporate the aluminum wire to a gaseous state, and the speed of coil unwinding and winding, that is, the coating speed is 500m / min.
  • Gaseous aluminum particles are deposited on the side of the coil containing the Fresnel structure layer, cooled and reduced, and the thickness of the obtained aluminum film is about 13 nm.
  • the reflectance of the aluminum film was measured by a spectrophotometer at 30%.
  • the reflective layer 104 is covered with a light absorbing layer 105, such as carbon black or aniline black.
  • the light absorbing layer can be sequentially applied to the threaded surface of the reflective layer 104 also having a Fresnel structure by means of simple and easy-to-use brushing, etc., and the process is simple and can reduce the screen manufacturing cost.
  • the projection screen can absorb ambient light in various directions.
  • FIG. 3 is a schematic structural diagram of a projection screen according to a second embodiment of the present invention. As shown in FIG. 3, this embodiment is different from the first embodiment in that the projection screen is not provided with a diffusion layer separately, but a surface diffusion structure is processed on the outer surface of the substrate layer 202, and the surface diffusion structure is used to Realize the function of the diffusion layer.
  • the projection screen includes a substrate layer 202, a Fresnel structure layer 203, a reflection layer 204, and a light absorption layer 205, which are sequentially arranged along an incident direction of the projection light.
  • a surface diffusion structure is firstly provided on one side of the base material layer 202, and then a photosensitive adhesive is coated on the side of the base material layer 202 without the surface diffusion structure, and then obtained through the same production process as in Example 1. Projection screen.
  • This embodiment simplifies the structure of the projection screen and reduces the difficulty of the production process and the screen cost.
  • FIG. 4 is a schematic structural diagram of a projection screen according to a third embodiment of the present invention.
  • the projection screen includes a reflective layer 304, a Fresnel structure layer 303, and a substrate layer 302 which are sequentially disposed along an incident direction of the projection light.
  • the thickness of the reflective layer 304 is 12 nm, and its reflectivity is 25%.
  • the substrate layer 302 is black.
  • this embodiment does not separately provide a diffusion layer. Instead, a surface diffusion structure is provided on the outer surface of the reflective layer 304, and the function of the diffusion layer is realized by using the surface diffusion structure.
  • the surface diffusion structure described in the above embodiment is a concave-convex structure, which can be formed by sand blasting, photolithography, and the like.
  • the thickness of the concave-convex structure along the direction normal to the surface is 1 ⁇ m to 10 ⁇ m, preferably It is 3 ⁇ m-6 ⁇ m; the size of the uneven structure along the surface parallel to the surface is 2 ⁇ m-40 ⁇ m, preferably 6 ⁇ m-24 ⁇ m.
  • the present invention increases the transmittance of the reflective layer by reducing the thickness of the reflective layer in the projection screen, and can additionally absorb ambient light in all directions without the need to selectively coat a light-absorbing layer on the Fresnel structure layer, thereby High contrast effect is achieved; and the thickness of the reflective layer is reduced, which saves coating costs and reduces process difficulty and screen costs.

Abstract

一种投影屏幕，所述投影屏幕包含依次设置的反射层、菲涅尔结构层以及基材层，所述反射层的厚度为7nm-25nm。本发明通过降低投影屏幕中反射层的厚度，增加了反射层透过率，无需额外在菲涅尔结构层上选择性涂覆吸光层，便可吸收各个方向环境光，从而达到高对比度效果；且反射层的厚度降低，节约了镀膜成本，减少了工艺难度和屏幕成本。

Description

投影屏幕 技术领域
本发明涉及一种投影屏幕，尤其涉及一种具有高对比度的投影屏幕。
背景技术
近年来已经开发出在投影仪和屏幕距离为50cm情况下实现超过100寸大屏幕投影的投影系统。该投影系统能够克服安装空间的限制。但是将投影系统安装在明亮的客厅这种存在大量杂光的环境中时，投影屏上的图像显示通常会出现一些问题，屏幕会反射环境光，从而造成对信号光的干扰，难以获得良好的对比度。对于棱镜结构的屏幕，为解决上述问题，需要将棱镜结构的凸起的面向屋顶环境光的一面涂吸光层，面向投影光的一面涂反射层，这种工艺难度大，成本高，且只能吸收一部分来自上方的环境光，不能吸收其他方向的环境光。
例如，专利文献KR1256594B1和JP4047172中公开的技术方案均是在反射屏幕中菲涅耳结构的特定区域选择性涂覆吸光层，这种方式只能吸收与投影光方向相差较大的环境光，不能吸收与投影光相同方向的环境光，且制作方式复杂，成本高。
发明内容
本发明所要解决的技术问题在于针对现有技术的不足，提供一种投影屏幕，通过降低投影屏幕中反射层的厚度，增加了反射层光透过率，无需额外在菲涅尔结构层上选择性涂覆吸光层，便可吸收各个方向环境光，从而达到高对比度效果；且反射层的厚度降低，节约了镀膜成本，减少了工艺难度和屏幕成本。
本发明所要解决的技术问题是通过如下技术方案实现的：
本发明提供一种投影屏幕，所述投影屏幕包含依次设置的反射层、 菲涅尔结构层以及基材层，所述反射层的厚度为7nm-25nm。
为了吸收环境杂光，所述投影屏幕在远离投影光线入射侧的一侧设有吸光层。
优选地，所述基材层的外表面设有面扩散结构。
优选地，所述投影屏幕还包含设置在投影光线的入射侧的扩散层，所述扩散层为体扩散层或面扩散层，所述扩散层与所述基材层通过设置透明胶粘剂进行粘接。
优选地，所述投影屏幕包含沿所述投影光线的入射方向依次设置的反射层、菲涅尔结构层以及基材层，所述反射层的外表面设置面扩散结构，所述基材层为黑色。
为了增大出射光线的发散角，所述面扩散结构为凹凸结构，其通过喷砂或光刻方式形成；所述凹凸结构沿其所在表面法线方向的厚度为1μm-10μm；所述凹凸结构沿平行于其所在表面的尺寸为2μm-40μm。
优选地，所述凹凸结构沿其所在表面法线方向的厚度为3μm-6μm；所述凹凸结构沿平行于其所在表面的尺寸为6μm-24μm。
优选地，所述菲涅尔结构层的厚度为10μm-100μm。所述反射层的厚度为8nm-13nm。
优选地，所述反射层的反射率为18％-50％，优选为20％-30％。
综上所述，本发明通过降低投影屏幕中反射层的厚度，增加了反射层透过率，无需额外在菲涅尔结构层上选择性涂覆吸光层，便可吸收各个方向环境光，从而达到高对比度效果；且反射层的厚度降低，节约了镀膜成本，减少了工艺难度和屏幕成本。
下面结合附图和具体实施例，对本发明的技术方案进行详细地说明。
附图说明
图1为反射层的反射率与反射层厚度之间的关系示意图；
图2为本发明实施例一投影屏幕的结构示意图；
图3为本发明实施例二投影屏幕的结构示意图；
图4为本发明实施例三投影屏幕的结构示意图。
具体实施方式
本发明提供一种投影屏幕，用于将投影光线反射至观看者的视场范围内，所述投影屏幕包含依次设置的反射层、菲涅尔结构层以及基材层。为了增大出射光线的发散角，所述投影屏幕还包含设置在投影光线的入射侧的扩散层。为了吸收环境杂光，所述投影屏幕在远离入射侧的一侧设有吸光层。投影屏幕在使用时，所述投影光线从扩散层入射，经反射层反射后再经扩散层射出，从而使观看者看到画面。
所述反射层为铝反射层、银反射层等，其可以通过磁控溅射或蒸镀等真空镀膜方式制备。
所述菲涅尔结构层采用卷对卷工艺以及光敏胶固化形成。
所述基材层可采用PET(聚对苯二甲酸乙二醇酯)、PC(聚碳酸酯)、PVC(聚氯乙烯)、PMMA(聚甲基丙烯酸甲酯)等透明聚合物。
所述扩散层可以为体扩散层或面扩散层，优选为面扩散层。体扩散层中含有体散射粒子；所述面扩散层的一面具有面扩散结构。
所述吸光层用于吸收透过反射层的环境光，提高图像对比度，如炭黑、苯胺黑等。
图1为反射层厚度与反射率之间的关系示意图。图1中的反射层采用铝反射层，如图1所示，当铝膜的厚度约大于55nm时，铝膜的反射率和透射率基本稳定，而当铝膜的厚度约小于55nm时，铝膜的反射率随铝膜厚度的减小而减小，透射率随铝膜厚度减小而增加。即可以通过改变反射层的厚度来控制投影屏幕的反射率。
表1示出了不同反射层厚度对应的投影屏幕的光学参数。经试验后综合考虑投影屏幕的反射率、增益与对比度等因素，为使所述投影屏幕能够显示高对比度画面，具体来说，当反射率低于18％时，增益太低，亮度太暗，而当反射率高于50％，对比度太差，因此，在本发明中所述反射层的反射率为18％-50％，反射层的厚度为7nm-25nm，优选地，反射率为20％-30％，反射层的厚度为8nm-13nm。
表1
反射层厚度/nm 反射率 增益 对比度
8 20％ 0.9 14.2
10 22％ 1.1 13.6
13 30％ 1.4 11.1
20 45％ 1.9 9.3
36 79％ 3.1 6.2
55 92％ 4.6 5.5
下面结合具体实施例对本发明投影屏幕的结构和生产过程作进一步地说明。
实施例一
图2为本发明实施例一投影屏幕的结构示意图。如图2所示，在本实施例中，所述投影屏幕包含沿所述投影光线的入射方向依次设置的扩散层101、基材层102、菲涅尔结构层103、反射层104以及吸光层105。
具体来说，所述扩散层101为面扩散层，所述面扩散层的一面具有微结构(面扩散结构)，将面扩散层没有微结构的一面与基材层102(透明PET)用透明胶粘剂粘接，在基材层102远离扩散层101的一面涂布光敏胶(如UV固化胶)，光敏胶的厚度为10μm-100μm，优选20μm-50μm。用卷对卷工艺将菲涅耳结构转印到涂布光敏胶的基材层102的表面，并用UV固化工艺固化，形成厚度为10μm-100μm的菲涅耳结构层103，卷对卷转印和UV固化都是成熟的工艺，具体工艺参数不再叙述。
本实施例采用铝反射层作为反射层104。将带有菲涅耳结构的卷料(由扩散层101、基材层102、菲涅尔结构层103组成)置于卷对卷真空蒸镀镀膜机内，用真空泵抽真空，真空度为10 -3Pa-10 -4Pa，加热铝丝，加热温度为1200℃-1300℃，使铝丝融化并蒸发为气态，卷料放卷和收卷的速度即镀膜速度为500m/min。气态铝微粒在卷料的含有菲涅耳结构层的一面沉积、冷却还原，得到的铝膜厚度大约为13nm。用分光光度计测得铝膜反射率为30％。
在反射层104上覆盖吸光层105，如炭黑、苯胺黑等材料。吸光层可以采用简单易操作的刷涂等方式依次涂在同样具备菲涅尔结构的反射层104的螺纹面上，工艺简单，可降低屏幕制作成本。
本实施例中，由于反射层104和吸光层105覆盖在整个菲涅尔结构层103上，所以投影屏幕可以吸收各个方向的环境光。
实施例二
图3为本发明实施例二投影屏幕的结构示意图。如图3所示，本实施例与实施例一相比，不同之处在于，投影屏幕没有单独设置扩散层，而是通过在基材层202的外表面加工出面扩散结构，利用面扩散结构来实现扩散层的功能。
具体来说，在本实施例中，所述投影屏幕包含沿所述投影光线的入射方向依次设置的基材层202、菲涅尔结构层203、反射层204以及吸光层205。
在生产上述投影屏幕时，首先在基材层202的一面设置面扩散结构，再在基材层202没有面扩散结构的一面涂布光敏胶，之后通过与实施例一相同的生产工艺便可得到投影屏幕。
本实施例简化了投影屏幕的结构，减少了生产工艺难度以及屏幕成本。
实施例三
图4为本发明实施例三投影屏幕的结构示意图。如图4所示，在本实施例中，所述投影屏幕包含沿所述投影光线的入射方向依次设置的反射层304、菲涅尔结构层303以及基材层302。所述反射层304的厚度为12nm，其反射率为25％。
在本实施例中，没有单独设置吸光层，为了吸收透过反射层的环境光，所述基材层302为黑色。
与实施例二类似，本实施例也没有单独设置扩散层，而是通过在反射层304的外表面设置面扩散结构，利用面扩散结构来实现扩散层的功能。
需要说明的是，上述实施例中所述的面扩散结构为凹凸结构，其可以通过喷砂、光刻等方式形成，所述凹凸结构沿其所在表面法线方向的厚度为1μm-10μm，优选为3μm-6μm；所述凹凸结构沿平行于其所在表面的尺寸为2μm-40μm，优选为6μm-24μm。通过上述凹凸结构，可以使得经反射层304反射后的光在15°的圆锥角内均匀扩散，消除散斑。
综上所述，本发明通过降低投影屏幕中反射层的厚度，增加了反射层透过率，无需额外在菲涅尔结构层上选择性涂覆吸光层，便可吸收各个方向环境光，从而达到高对比度效果；且反射层的厚度降低，节约了镀膜成本，减少了工艺难度和屏幕成本。

Claims (10)

  1. 一种投影屏幕，其特征在于，所述投影屏幕包含依次设置的反射层、菲涅尔结构层以及基材层，所述反射层的厚度为7nm-25nm。
  2. 如权利要求1所述的投影屏幕，其特征在于，所述投影屏幕在远离投影光线入射侧的一侧设有吸光层。
  3. 如权利要求2所述的投影屏幕，其特征在于，所述基材层的外表面设有面扩散结构。
  4. 如权利要求2所述的投影屏幕，其特征在于，所述投影屏幕还包含设置在投影光线的入射侧的扩散层，所述扩散层为体扩散层或面扩散层，所述扩散层与所述基材层通过设置透明胶粘剂进行粘接。
  5. 如权利要求1所述的投影屏幕，其特征在于，所述投影屏幕包含沿所述投影光线的入射方向依次设置的反射层、菲涅尔结构层以及基材层，所述反射层的外表面设置面扩散结构，所述基材层为黑色。
  6. 如权利要求3或5所述的投影屏幕，其特征在于，所述面扩散结构为凹凸结构，所述凹凸结构沿其所在表面法线方向的厚度为1μm-10μm；所述凹凸结构沿平行于其所在表面的尺寸为2μm-40μm。
  7. 如权利要求6所述的投影屏幕，其特征在于，所述凹凸结构沿其所在表面法线方向的厚度为3μm-6μm；所述凹凸结构沿平行于其所在表面的尺寸为6μm-24μm。
  8. 如权利要求1所述的投影屏幕，其特征在于，所述菲涅尔结构层的厚度为10μm-100μm。
  9. 如权利要求1所述的投影屏幕，其特征在于，所述反射层的厚 度为8nm-13nm。
  10. 如权利要求1所述的投影屏幕，其特征在于，所述反射层的反射率为18％-50％，优选为20％-30％。
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