WO2016054795A1 - 一种短焦正投影屏幕结构 - Google Patents

一种短焦正投影屏幕结构 Download PDF

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Publication number
WO2016054795A1
WO2016054795A1 PCT/CN2014/088258 CN2014088258W WO2016054795A1 WO 2016054795 A1 WO2016054795 A1 WO 2016054795A1 CN 2014088258 W CN2014088258 W CN 2014088258W WO 2016054795 A1 WO2016054795 A1 WO 2016054795A1
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Prior art keywords
triangular
segment
screen
light
projection
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PCT/CN2014/088258
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English (en)
French (fr)
Inventor
廖天驹
乔俊枫
张昭宇
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Peking University Shenzhen Graduate School
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Peking University Shenzhen Graduate School
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Priority to PCT/CN2014/088258 priority Critical patent/WO2016054795A1/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

Definitions

  • the application relates to a short-focus orthographic projection screen structure.
  • the screen is divided into two categories: front projection screen (reflective) and rear projection screen (transmissive).
  • the projection distance of the front projection screen is longer (compared to the short-focus projection), which is seriously affected by the ambient light, but the structure is simple and adapts to various scenes.
  • the rear projection screen has a strong overall feeling, and the influence of ambient light is small, but the structure is complicated and the size is limited by volume.
  • diffuse screens are usually used.
  • the diffuse reflection screen is characterized by large viewing angle, low gain, strong adaptability to ambient light, and wide application range.
  • One of the diffuse reflection screen technologies is to directly process the surface of the material, the screen angle and resolution are not ideal, and the solar effect is also serious.
  • Another diffuse reflection screen technology is made by using a transparent material such as acrylic or glass as a substrate, and a rear-projection soft screen is attached to the surface. There are usually additional structures on this soft screen to implement other functions, such as Fresnel lenses.
  • Fresnel optical lens screen increases the gain of the screen, but its vertical viewing angle is limited.
  • Fresnel optical lens screens vary according to the Fresnel lens slot angle, and each screen has a different focal length to meet the needs of different lens projectors.
  • FIG. 1 is a front projection screen based on a common diffuse reflection model in the prior art, in which each unit of the Fresnel sheet is designed into a triangular structure. Projected light is projected from the front and bottom of the screen onto the screen.
  • the upper surface 101 of the small triangle is an absorbing layer, generally absorbing particles are added to absorb ambient light or the mirror reflects ambient light 103 from the upper portion.
  • the lower surface 102 is a diffuse scattering layer for diffusely reflecting the projected light 104 into the field of view region 106.
  • This structure can effectively absorb or reflect ambient light and project the projected light into the field of view of a person.
  • the ambient light 105 is projected onto the lower surface 102, the reflected light of the diffuse reflection layer also enters the field of view area 106, affecting the projection effect.
  • the present application provides a short-focus orthographic projection screen structure that can reduce ambient light entering the diffuse reflection layer, thereby reducing the effect of ambient light on the projection of the orthographic projection screen.
  • a short-focus orthographic projection screen structure wherein one side of the projection light is composed of N segments, N is greater than or equal to 2; each segment has a triangular protrusion, and the face with the triangular protrusion facing upward is used for absorption or/and reflection Ambient light, the triangular convex downward facing surface is used for diffuse reflection of the projected light; the triangular convex upward facing surface adapts the projection light to cover the required angle to maximize the absorption of ambient light by the surface, the first segment to The triangular parameter of the Nth segment is sequentially increased, and the triangular parameter is a ratio of a side length of a face of the triangular convex upward facing side and a side length of a face of the triangular convex downward facing, or the triangular parameter is a triangular convex downward facing The angle between the face and the screen.
  • the number of triangular protrusions on each segment may be one or a plurality of identical triangular protrusions.
  • Each segment is arc-shaped on the screen.
  • the radius of the arc increases from the first segment to the N-th segment.
  • the new short-focus orthographic projection screen structure increases the triangular parameter of the new short-focus orthographic projection screen structure from the first segment to the N-th segment in turn, compared with the prior art short-focus orthographic projection screen structure.
  • the short-focus orthographic projection screen structure of the prior art has the same triangular parameters of all the triangular protrusions.
  • the diffuse reflection layer of the projection screen structure is irradiated to the absorption layer, so that the new short-focus orthographic projection screen structure reduces the ambient light entering the diffuse reflection layer, thereby reducing the influence of ambient light on the projection of the orthographic projection screen.
  • FIG. 1 is a schematic diagram of a projection principle of a front projection screen of the prior art
  • FIG. 2 is a schematic structural diagram of a short-focus orthographic projection screen according to Embodiment 1 of the present application;
  • FIG. 3 is a schematic diagram showing the distribution of various segments on the surface of a short-focus orthographic projection screen according to Embodiment 1 of the present application;
  • FIG. 4 is a schematic diagram of a projection principle of a front projection screen according to Embodiment 1 of the present application.
  • FIG. 5 is a schematic structural diagram of a short-focus orthographic projection screen according to Embodiment 2 of the present application.
  • FIG. 6 is a schematic diagram showing the distribution of various segments on the surface of a short-focus orthographic projection screen according to Embodiment 2 of the present application;
  • FIG. 7 is a schematic diagram of a projection principle of a front projection screen according to Embodiment 2 of the present application.
  • FIG. 8 is a schematic structural diagram of a short-focus orthographic projection screen according to Embodiment 3 of the present application.
  • FIG. 9 is a comparison diagram of projection principles of a front projection screen and a front projection screen of the prior art according to Embodiment 3 of the present application.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the surface of the orthographic projection screen is a Fresnel lens sawtooth structure layer, that is, the surface of the orthographic projection screen is composed of a plurality of triangular protrusions, and the upwardly facing surface of the triangular protrusion is composed of carbon black particles to form an absorption layer. It is used to absorb most of the ambient light from the upper part; all the faces with the triangular protrusions facing downward form a diffuse reflection layer, and the projection light from the lower part is diffusely reflected when it is incident on the surface, thereby entering the field of view.
  • the upwardly convex surface of the triangular protrusion fits the projection light to cover the required angle so that the surface absorbs the ambient light to the utmost extent.
  • the surface of the front projection screen is divided into N segments, one for each segment.
  • the triangular protrusion is composed, that is, the surface of the orthographic projection screen is composed of N triangular protrusions.
  • the first segment is 2-1 segments
  • the second segment is 2-2 segments, ..., and so on
  • the Nth segment is 2-N segments.
  • the side of the face with the triangular protrusion upward is the length of the upper side
  • the length of the side of the downward direction of the triangular protrusion is the length of the lower side
  • the upper side of the first section is h 1 and the lower side is d 1
  • the upper side of the second section The length is h 2 and the lower side is d 2
  • the upper side of the Nth segment is h N and the lower side is d N .
  • the ratio of the side length of the face of the triangular convex upward to the side length of the face of the triangular convex downward is a triangular parameter, that is, the ratio of the length of the upper side to the length of the lower side is a triangular parameter, and the triangle of the triangular protrusion on the first section
  • the parameter is the first triangular parameter t 1
  • the triangular parameter of the triangular protrusion on the second segment is the second triangular parameter t 2 , ..., and so on
  • the triangular parameter of the triangular protrusion on the Nth segment is the Nth Triangular parameter t N .
  • each segment of the screen surface is shown in Figure 3.
  • Figure 3 reflects the entire screen layout as a Fresnel lens structure. In the appropriate case, a linear structure can also be used as the layout.
  • Each segment has a circular arc on the screen. Distribution, the solid line of each arc in the figure is composed of the vertices of the triangles of the same segment, the first segment is 2-1 segments, the second segment is 2-2 segments, ..., the Nth segment is 2- In the N segment, and from the first segment to the N segment, the radius of the arc increases in turn, and all the circles are concentric circles.
  • All the triangular upward facing faces of the projection screen 400 constitute an absorbing layer, which can absorb most of the ambient light 422 from the upper portion.
  • All of the triangular downwardly facing faces constitute a diffusely reflective layer, and the projected light 412 from the lower portion is diffusely reflected upon entering the surface, thereby entering the field of view.
  • the ambient light 422 is from the fluorescent lamp 421, the projected light is from the projection lamp 411, and the fluorescent lamp and the projection lamp can be regarded as a point light source.
  • the horizontal distance between the fluorescent lamp 421 and the projection screen 400 is controlled within a certain range (a, b).
  • a, b the opening angle of the fluorescent lamp 421 with respect to the absorption layer 401 is large, that is, the maximum Most of the ambient light is absorbed.
  • the opening angle of the fluorescent lamp 421 to the absorption layer 401 is reduced, but since the distance becomes larger, the intensity of the light projected on the projection screen is also lowered, so that the ambient light effect is also good.
  • the fluorescent lamp 421 does not cause much imaging interference to the screen 400.
  • the horizontal distance of the fluorescent lamp from the projection screen is (a+b)/2, and the screen structure diagram designed at this time has a certain representativeness.
  • the upper surface 401 of the triangular protrusion is an absorbing layer, and the lower surface 402 of the triangular protrusion is a diffuse reflection layer.
  • the triangular parameters are sequentially increased, and the angle between the upper surface and the vertical direction changes, and the extension line of the adjacent two inclined surfaces intersects the light emitting source, that is, the projection lamp 411. .
  • the absorbing layer 401 can absorb the ambient light 422 well, and ideally the ambient light does not reach the lower surface diffuse reflective layer. At this time, the lower surface of the triangle is a diffuse reflection surface, and the projection light 412 hardly projects onto the absorption surface, and substantially diffuse scattering occurs on the lower surface 402.
  • the ambient light 422 and the incident light 412 are incident on the upper and lower two different surfaces of the small triangle, respectively.
  • the screen 400 covers the required angle by adapting the short-focus projection light at different positions, and absorbs the ambient light to the greatest extent without affecting the projection light, thereby reducing the entry of the diffuse.
  • the ambient light of the reflective layer reduces the influence of ambient light on the projection of the orthographic projection screen, increases the contrast between the projected light and the ambient light, and improves the adaptation to the glare environment.
  • the screen can absorb ambient light to a large extent, and can well control the projection light into the field of view of the person, and avoid the scattering of the projected light into unnecessary areas.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the surface of the orthographic projection screen is a layer of Fresnel lens sawtooth structure, that is, the surface of the orthographic projection screen is composed of a plurality of triangular protrusions, and the surface of the triangular protrusion facing upward is a specular reflection layer for reflection.
  • the upwardly facing surface of the triangular protrusion is adapted to cover the desired angle of the projection light so that the surface absorbs the ambient light to the utmost extent.
  • the surface of the front projection screen is divided into N segments, each segment being composed of 3 segments.
  • the same triangular convex composition As shown in FIG. 5, the first segment is 5-1 segments, the second segment is 5-2 segments, ..., and so on, and the Nth segment is 5-N segments.
  • the angle between the face of the triangular protrusion and the screen is a triangular parameter, and the triangular parameter of the triangular protrusion on the first segment is the first triangular parameter t 1 , and the triangular parameter of the triangular protrusion on the second segment For the second triangular parameter t 2 , . . .
  • the triangular parameter of the triangular protrusion on the Nth segment is the Nth triangular parameter t N .
  • the triangular parameters are sequentially increased, that is, t 1 ⁇ t 2 ⁇ ...t N .
  • FIG. 7 is a schematic diagram showing the projection principle of the orthographic projection screen of the present embodiment.
  • All the triangular upward facing faces of the projection screen 700 constitute a specular reflection layer 701 for reflecting most of the ambient light 722 from the upper half.
  • All of the triangular downwardly facing faces form a diffusely reflective layer 702 from which diffused reflection occurs when the projected light 712 from the lower half is incident on the surface.
  • the ambient light 722 is from the fluorescent light 721
  • the projected light 712 is from the projection light 711
  • the fluorescent light and the projection light can be regarded as a point light source.
  • the specularly reflective layer 701 can reflect ambient light 722 well, reducing ambient light reaching the diffuse reflective layer of the lower surface.
  • the projected light projected onto the surface of the absorbing layer is also reduced a lot, and substantially diffuse scattering occurs on the lower surface 702.
  • the ambient light 722 and the projected light 712 are incident on the upper and lower two different surfaces of the small triangle, respectively.
  • the screen 700 covers the required angle by adapting the short-focus projection light at different positions, and absorbs the ambient light to the greatest extent without affecting the projection light, thereby reducing the entry of the diffuse.
  • the ambient light of the reflective layer reduces the influence of ambient light on the projection of the orthographic projection screen, increases the contrast between the projected light and the ambient light, and improves the adaptation to the glare environment.
  • the screen can absorb ambient light to a large extent, and can well control the projection light into the field of view of the person, and avoid the scattering of the projected light into unnecessary areas.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the surface of the orthographic projection screen 800 is a layer of Fresnel lens sawtooth structure, that is, the surface of the orthographic projection screen is composed of a large number of triangular protrusions, and the face of the triangular protrusion facing upward is composed of carbon black particles. It is used to absorb most of the ambient light from the upper part; all the faces with the downward convex triangles form a diffuse reflection layer, and the projection light from the lower half is diffusely reflected when it is incident on the surface, thereby entering the field of view.
  • the surface of the orthographic projection screen is divided into two segments, each segment consisting of a plurality of triangular projections. As shown in Fig.
  • the first segment is 8-1 segments
  • the second segment is 8-2 segments.
  • the side of the face with the triangular protrusions is the upper side length, and the side of the triangular convex face is the lower side.
  • the upper side of the first segment is H 1 and the lower side is D 1 ; the upper side of the second segment is H 2 and the lower side is D 2 .
  • the ratio of the upper side to the lower side is a triangular parameter
  • the triangular parameter of the triangular protrusion on the first segment is the first triangular parameter T 1
  • FIG. 9 is a comparison diagram of the projection principle of the front projection screen of the present embodiment and the front projection screen of the prior art. All the triangular upwardly facing surfaces of the projection screen constitute an absorption layer, which can absorb ambient light from the upper half. . All of the faces with the triangular projections form a diffuse reflection layer, and the projection light from the lower half is diffusely reflected when it enters the surface, thereby entering the field of view.
  • the ambient light is from the fluorescent lamp 920, and the projected light is from the projection light source 910.
  • the orthographic projection screen 930 of the present embodiment and the front projection screen 940 of the prior art are placed symmetrically with respect to the fluorescent lamp and the projection light source, that is, placed in a mirror symmetrical form.
  • the projection light 911 of the projection light source and the projection light 912 are symmetric in the propagation direction, and the ambient light 921 and the ambient light 922 are symmetric in the propagation direction.
  • the upper surface is 933 and the lower surface is 934; for comparison, the triangular projection is examined on the front projection screen of the prior art.
  • Triangular projections at the same vertical height have an upper surface of 943 and a lower surface of 944.
  • the upper surface is 931 and the lower surface is 932; on the front projection screen of the prior art, the same vertical position as the triangular protrusion is considered.
  • the height of the triangular protrusion has an upper surface of 941 and a lower surface of 942.
  • the range of the second segment of the orthographic projection screen of the embodiment natural light in some directions can be irradiated to the lower surface of the triangular protrusion, so the range of the second segment is mainly to enhance the performance of the screen to absorb ambient light, that is, to make more The ambient light illuminates the upper surface of the triangular protrusion.
  • the ambient light 921 can be irradiated onto the upper surface 931 to be absorbed
  • the orthographic projection screen of the prior art is used, the ambient light 922 is irradiated onto the lower surface 942 and is diffusely reflected.
  • the second segment of the orthographic projection screen of the present embodiment is capable of better absorbing ambient light.
  • the range of the first segment of the orthographic projection screen of the present embodiment since the ambient light is limited by the propagation direction, the ambient light that can be irradiated onto the lower surface of the triangular projection is already small, so the range in the first segment is mainly enhanced. Diffuse reflection of the screen.
  • the projection light 911 can be irradiated onto the lower surface 934 to be diffusely reflected
  • the projection light 912 is irradiated onto the upper surface 943 to be absorbed.
  • the projection light caused by the diffuse reflection is reduced. Therefore, the first segment of the orthographic projection screen of the embodiment can better increase the contrast between the projection light and the ambient light, and make the light intensity obtained by the diffuse reflection brighter.
  • the screen 930 covers the required angle by adapting the short-focus projection light at different positions, and absorbs the ambient light to the greatest extent without affecting the projection light, thereby reducing the entry of the diffuse.
  • the ambient light of the reflective layer reduces the influence of ambient light on the projection of the orthographic projection screen, increasing the contrast between the projected light and the ambient light.
  • the screen can absorb ambient light to a large extent, and can well control the projection light into the field of view of the person, and avoid the scattering of the projected light into unnecessary areas.

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Abstract

一种短焦正投影屏幕结构，其接受投影光的一面由N个段组成，N大于或等于2；每一段上都有三角凸起，三角凸起朝上的面用于吸收或/和反射环境光，三角凸起朝下的面用于对投影光进行漫反射；三角凸起朝上的面适配投影光覆盖所需的角度以使该面最大程度地吸收环境光，其实现为，第一段至第N段的三角参数依次增大，所述三角参数为三角凸起朝上的面的边长与三角凸起朝下的面的边长之比，或者所述三角参数为三角凸起朝下的面与屏幕所成的夹角。每一段在屏幕上呈圆弧形分布，且自第一段至第N段，圆弧半径依次增加。该短焦正投影屏幕结构减少了进入漫反射层的环境光，从而减少环境光对正投影屏幕成像的影响。

Description

一种短焦正投影屏幕结构 技术领域
本申请涉及一种短焦正投影屏幕结构。
背景技术
屏幕从投影方式分为正面投影屏幕（反射式）和背面投影屏幕（透射式）两大类。正投屏幕投影距离较长（与短焦投影相比），会受环境光的影响造成画面对比度的严重下降，但是结构简单，适应多种场景。背投屏幕画面整体感较强，环境光的影响较小，但是结构复杂，大小受到体积限制。
而对于屏幕本身而言，通常主要采用漫反射屏。漫反射屏幕的特点是视角大、增益低、对环境光适应能力比较强，应用范围广阔。漫反射屏幕技术之一是直接对材质表面进行处理，屏幕视角和清晰度都不理想，太阳效应也比较严重。
另一种漫反射屏幕技术则是利用亚克力、玻璃等透明体材料作为基底，在其表面粘贴背投软质屏幕制作而成。通常在这层软质屏幕上会有额外的结构来实现其他功能，比如菲涅尔透镜。
菲涅尔光学透镜屏幕则能增加屏幕的增益，但是其垂直视角却受到了一定的限制。菲涅尔光学透镜屏幕根据菲涅尔透镜槽距角度的不同而不同，每款屏幕都具有不同的焦距，以便满足不同镜头投影机的需要。
图1为现有技术中基于普通漫反射模型的正投影屏幕，图中菲涅尔片每一个单位被设计成了三角形的结构。投影光从屏幕的前下方投射到屏幕上。其中小三角形的上表面101为吸收层，一般加入吸收颗粒来吸收环境光或者反射镜反射来自上半部分的环境光103。下表面102为漫散射层，用于对投影光104进行漫反射使之进入视野区域106。这种结构可以有效的将环境光进行吸收或反射，而将投影光投射至人的视野范围。但是此设计方案中，如果环境光105投射到下表面102，则其漫反射层的反射光也会进入视野区域106，影响投影效果。
 发明内容
本申请提供了一种短焦正投影屏幕结构，可以减少进入漫反射层的环境光，从而减少环境光对正投影屏幕成像的影响。
一种短焦正投影屏幕结构，其接受投影光的一面由N个段组成，N大于或等于2；每一段上都有三角凸起，三角凸起朝上的面用于吸收或/和反射环境光，三角凸起朝下的面用于对投影光进行漫反射；三角凸起朝上的面适配投影光覆盖所需的角度以使该面最大程度地吸收环境光，第一段至第N段的三角参数依次增大，所述三角参数为三角凸起朝上的面的边长与三角凸起朝下的面的边长之比，或者所述三角参数为三角凸起朝下的面与屏幕所成的夹角。每一段上的三角凸起的个数可以是一个，也可以是多个相同的三角凸起。
每一段在屏幕上呈弧线形分布，当弧线为圆弧时，自第一段至第N段，圆弧半径依次增大。
本申请的有益效果是，新型短焦正投影屏幕结构和现有技术短焦正投影屏幕结构相比，新型短焦正投影屏幕结构从第一段至第N段的三角参数依次增大，而现有技术短焦正投影屏幕结构所有三角凸起的三角参数都相同，因此在同样的条件下，某些能够进入现有技术短焦正投影屏幕结构漫反射层的环境光无法进入新型短焦正投影屏幕结构的漫反射层，而是照射到吸收层，从而新型短焦正投影屏幕结构减少了进入漫反射层的环境光，进而减少环境光对正投影屏幕成像的影响。
附图说明
图1为现有技术正投影屏幕的投影原理示意图；
图2为本申请实施例一的短焦正投影屏幕结构示意图；
图3为本申请实施例一的短焦正投影屏幕结构表面各段分布示意图；
图4为本申请实施例一的正投影屏幕的投影原理示意图；
图5为本申请实施例二的短焦正投影屏幕结构示意图；
图6为本申请实施例二的短焦正投影屏幕结构表面各段分布示意图；
图7为本申请实施例二的正投影屏幕的投影原理示意图；
图8为本申请实施例三的短焦正投影屏幕结构示意图；
图9为本申请实施例三的正投影屏幕和现有技术的正投影屏幕的投影原理对比图。
具体实施方式
下面通过具体实施方式结合附图对本发明作进一步详细说明。
实施例一：
如图2所示，正投影屏幕的表面是菲涅尔透镜锯齿结构层，即正投影屏幕的表面由数量众多的三角凸起组成，三角凸起朝上的面由炭黑颗粒构成吸收层，用来吸收大部分来自上部分的环境光；所有三角凸起朝下的面构成漫反射层，来自下部分的投影光入射到该表面时发生漫反射，从而进入视野区。三角凸起朝上的面适配投影光覆盖所需的角度以使该面最大程度地吸收环境光，为了表述上的方便，设定正投影屏幕的表面分为N个段，每一段由一个三角凸起组成，即正投影屏幕的表面由N个三角凸起组成。如图2所示，第一段为2-1段，第二段为2-2段，…，以此类推，第N段为2-N段。三角凸起朝上的面的边长为上边长，三角凸起朝下的面的边长为下边长，则第一段的上边长为h1，下边长为d1；第二段的上边长为h2，下边长为d2；依次类推，第N段的上边长为hN，下边长为dN。三角凸起朝上的面的边长与三角凸起朝下的面的边长之比为三角参数，即上边长与下边长之比为三角参数，在第一段上的三角凸起的三角参数为第一三角参数t1，在第二段上的三角凸起的三角参数为第二三角参数t2，…，以此类推，在第N段上的三角凸起的三角参数为第N三角参数tN。采用适配形状的方式，从第一段至第N段，三角参数依次增大，即t1=h1／d1，t2=h2／d2，…，tN=hN／dN，(t1< t2<…tN)。
屏幕表面各个段的分布形式如图3所示，图3反映了整个屏幕布局为菲涅尔透镜结构，在适当的情况下也可以采用线性结构来作为布局，每一段在屏幕上呈圆弧形分布，图中的每一条圆弧实线由同一段的三角凸起的顶点连线构成，第一段为2-1段，第二段为2-2段，…，第N段为2-N段，且自第一段至第N段，圆弧半径依次增大，所有的圆都是同心圆。
如图4所示为本实施例的正投影屏幕的投影原理示意图，投影屏幕400的所有三角凸起朝上的面构成吸收层，可以来吸收大部分来自上部分的环境光422。所有三角凸起朝下的面构成漫反射层，来自下部分的投影光412入射入该表面时发生漫反射，从而进入视野区。
环境光422来自日光灯421，投影光来自投影灯411，日光灯和投影灯可视为点光源。日光灯421与投影屏幕400的水平距离控制在一定范围内（a，b），当日光灯421与投影屏幕400的水平距离小于a时，日光灯421相对于吸收层401的张角较大，即绝大多数的环境光都被吸收。随着距离的加大，日光灯421对于吸收层401的张角有所减小，但是由于距离变大，其投射在投影屏上的光强也降低，故而也有着很好的抗环境光效果，故日光灯421与投影屏幕400的水平距离大于距离b时，日光灯421对于屏幕400也不会造成很大的成像干扰。本实施例选取日光灯距离投影屏幕的水平距离为（a+b）/2，此时设计出来的屏幕结构图具有一定代表性。三角凸起的上表面401是吸收层，三角凸起的下表面402是漫反射层。在三角形结构中，从第一段至第N段，三角参数依次增大，上表面与竖直方向的夹角发生变化，相邻两个斜面的延长线交于光的发射源即投影灯411。吸收层401可以很好地吸收环境光422，在理想情况下环境光不会达到下表面漫反射层。此时三角形下表面为漫反射表面，投影光412几乎不会投射到吸收表面上，基本上都在下表面402发生了漫散射。
由于三角形结构上表面倾角的改变，使得环境光422和入射光412分别入射到小三角形的上下两个不同的表面。
通过对屏幕结构的这种设计，屏幕400通过适配不同位置上短焦投影光覆盖所需要的角度，在投影光不受影响的情况下，最大程度上对环境光进行吸收，减少了进入漫反射层的环境光，从而减少环境光对正投影屏幕成像的影响，增大了投影光与环境光的对比度，提高了对强光环境的适应。屏幕可以很大程度地吸收环境光，能够很好的控制投影光入射进人的视野范围，避免投影光散射到不必要的区域之内。
实施例二：
如图5所示，正投影屏幕的表面是菲涅尔透镜锯齿结构层，即正投影屏幕的表面由数量众多的三角凸起组成，三角凸起朝上的面为镜面反射层，用来反射大部分来自上部分的环境光；所有三角凸起朝下的面构成漫反射层，来自下部分的投影光入射到该表面时发生漫反射，从而进入视野区。三角凸起朝上的面适配投影光覆盖所需的角度以使该面最大程度地吸收环境光，为了表述上的方便，设定正投影屏幕的表面分为N个段，每一段由3个相同三角凸起组成。如图5所示，第一段为5-1段，第二段为5-2段，…，以此类推，第N段为5-N段。三角凸起朝下的面与屏幕所成的夹角为三角参数，在第一段上的三角凸起的三角参数为第一三角参数t1，在第二段上的三角凸起的三角参数为第二三角参数t2，…，以此类推，在第N段上的三角凸起的三角参数为第N三角参数tN。采用适配形状的方式，从第一段至第N段，三角参数依次增大，即t1< t2<…tN。
屏幕表面各个段的分布形式如图6所示，在适当的情况下也可以采用线性结构来作为布局，每一段在屏幕上呈弧线形分布。
如图7所示为本实施例的正投影屏幕的投影原理示意图，投影屏幕700的所有三角凸起朝上的面构成镜面反射层701，用以反射大部分来自上半部分的环境光722。所有三角凸起朝下的面构成漫反射层702，来自下半部分的投影光712入射入该表面时发生漫反射，从而进入视野区。
环境光722来自日光灯721，投射光712来自投影灯711，日光灯和投影灯可视为点光源。镜面反射层701可以很好地反射环境光722，减少了达到下表面漫反射层的环境光。投射到吸收层表面的投射光也减少了很多，基本上都在下表面702发生了漫散射。
由于三角形结构上表面倾角的改变，使得环境光722和投射光712分别入射到小三角形的上下两个不同的表面。
通过对屏幕结构的这种设计，屏幕700通过适配不同位置上短焦投影光覆盖所需要的角度，在投影光不受影响的情况下，最大程度上对环境光进行吸收，减少了进入漫反射层的环境光，从而减少环境光对正投影屏幕成像的影响，增大了投影光与环境光的对比度，提高了对强光环境的适应。屏幕可以很大程度地吸收环境光，能够很好的控制投影光入射进人的视野范围，避免投影光散射到不必要的区域之内。
实施例三：
如图8所示，正投影屏幕800的表面是菲涅尔透镜锯齿结构层，即正投影屏幕的表面由数量众多的三角凸起组成，三角凸起朝上的面由炭黑颗粒构成吸收层，用来吸收大部分来自上半部分的环境光；所有三角凸起朝下的面构成漫反射层，来自下半部分的投影光入射到该表面时发生漫反射，从而进入视野区。正投影屏幕的表面分为2个段，每一段由多个三角凸起组成。如图8所示，第一段为8-1段，第二段为8-2段，三角凸起朝上的面的边长为上边长，三角凸起朝下的面的边长为下边长，则第一段的上边长为H1，下边长为D1；第二段的上边长为H2，下边长为D2。上边长与下边长之比为三角参数，在第一段上的三角凸起的三角参数为第一三角参数T1，在第二段上的三角凸起的三角参数为第二三角参数T2，即T1= H1/ D1，T2= H2/ D2，采用适配形状的方式，T1在数值上小于T2。
如图9所示为本实施例的正投影屏幕与现有技术正投影屏幕的投影原理对比图，投影屏幕所有三角凸起朝上的面构成吸收层，可以来吸收来自上半部分的环境光。所有三角凸起朝下的面构成漫反射层，来自下半部分的投影光入射入该表面时发生漫反射，从而进入视野区。
环境光来自日光灯920，投射光来自投影光源910，为了便于对比，本实施例的正投影屏幕930和现有技术的正投影屏幕940相对于日光灯和投影光源对称放置，即以镜像对称的形式放置。投射光源的投射光911和投射光912的传播方向对称，环境光921和环境光922的传播方向对称。对于本实施例的正投影屏幕第一段上的某一个三角凸起，其上表面为933，下表面为934；为便于对比，在现有技术的正投影屏幕上，考察与该三角凸起位于同一竖直高度的三角凸起，其上表面为943，下表面为944。对于本实施例的正投影屏幕第二段上的某一个三角凸起，其上表面为931，下表面为932；在现有技术的正投影屏幕上，考察与该三角凸起位于同一竖直高度的三角凸起，其上表面为941，下表面为942。
在本实施例的正投影屏幕的第二段的范围，某些方向的自然光能够照射到三角凸起下表面，因此在第二段的范围主要是增强屏幕吸收环境光的性能，即让更多的环境光照射到三角凸起的上表面。当使用本实施例的正投影屏幕时，环境光921能够照射到上表面931上从而被吸收，而当使用现有技术的正投影屏幕，环境光922却照射到下表面942上并被漫反射，从而影响投影效果，因此，本实施例的正投影屏幕的第二段能够更好地吸收环境光。
在本实施例的正投影屏幕的第一段的范围，由于环境光受传播方向的限制，能够照射到三角凸起的下表面的环境光已经很少，因此在第一段的范围主要是增强屏幕的漫反射。当使用本实施例的正投影屏幕时，投射光911能够照射到下表面934上从而被漫反射，而当使用现有技术的正投影屏幕，投射光912却照射到上表面943上从而被吸收，导致被漫反射的投射光减少，因此，本实施例的正投影屏幕的第一段能够更好地增大投影光与环境光的对比度，使漫反射得到的光强更加明亮。
通过对屏幕结构的这种设计，屏幕930通过适配不同位置上短焦投影光覆盖所需要的角度，在投影光不受影响的情况下，最大程度上对环境光进行吸收，减少了进入漫反射层的环境光，从而减少环境光对正投影屏幕成像的影响，增大了投影光与环境光的对比度。屏幕可以很大程度地吸收环境光，能够很好的控制投影光入射进人的视野范围，避免投影光散射到不必要的区域之内。
以上内容是结合具体的实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干简单推演或替换。

Claims (10)

  1. 一种短焦正投影屏幕结构，其接收投影光的一面由N个段组成，N大于或等于2；每一段上都有三角凸起，三角凸起朝上的面用于吸收或/和反射环境光，三角凸起朝下的面用于对投影光进行漫反射；其特征在于，三角凸起朝上的面适配投影光覆盖所需的角度以使该面最大程度地吸收环境光。
  2. 如权利要求1所述的结构，其特征在于，三角凸起朝上的面适配投影光覆盖所需的角度以使该面最大程度地吸收环境光的实现为：第一段至第N段的三角参数依次增大，所述三角参数为三角凸起朝上的面的边长与三角凸起朝下的面的边长之比，或者所述三角参数为三角凸起朝下的面与屏幕所成的夹角。
  3. 如权利要求2所述的结构，其特征在于，所述每一段上有一个三角凸起。
  4. 如权利要求2所述的结构，其特征在于，所述每一段上有多个三角凸起，同一段上的三角凸起的三角参数数值相等。
  5. 如权利要求2所述的结构，其特征在于，所述每一段在屏幕上呈弧线形分布。
  6. 如权利要求5所述的结构，其特征在于，所述每一段在屏幕上呈圆弧形分布，且自第一段至第N段，圆弧半径依次增大。
  7. 如权利要求2所述的结构，其特征在于，所述各个三角凸起之间的距离两两相等。
  8. 如权利要求2所述的结构，其特征在于，所述各个三角凸起凸出屏幕表面的高度相等。
  9. 如权利要求2所述的结构，其特征在于，所述三角凸起朝上的面的材料为炭黑。
  10. 如权利要求2所述的结构，其特征在于，所述所有三角凸起在屏幕表面构成菲涅尔透镜锯齿结构。
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