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WO2016054795A1 - Structure d'écran de projection orthographique de courte longueur focale - Google Patents

Structure d'écran de projection orthographique de courte longueur focale 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
Authority
WO
WIPO (PCT)
Prior art keywords
triangular
segment
screen
light
projection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2014/088258
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English (en)
Chinese (zh)
Inventor
廖天驹
乔俊枫
张昭宇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Peking University Shenzhen Graduate School
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Peking University Shenzhen Graduate School
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Peking University Shenzhen Graduate School filed Critical Peking University Shenzhen Graduate School
Priority to PCT/CN2014/088258 priority Critical patent/WO2016054795A1/fr
Publication of WO2016054795A1 publication Critical patent/WO2016054795A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

La présente invention concerne une structure d'écran de projection orthographique de courte longueur focale, son côté recevant de la lumière de projection comprenant N segments, N étant supérieur ou égal à deux ; chaque segment comporte une saillie triangulaire, la surface orientée vers le haut de la saillie triangulaire étant utilisée pour absorber et/ou réfléchir la lumière ambiante et la surface orientée vers le bas de la saillie triangulaire étant utilisée pour réfléchir diffusément la lumière de projection ; la surface orientée vers le haut de la saillie triangulaire correspond à un angle requis pour une couverture de lumière de projection pour permettre à la surface d'absorber au maximum la lumière ambiante, sa mise en œuvre étant comme suit : un paramètre triangulaire à partir d'un premier segment à un N-ème segment augmente séquentiellement, le paramètre triangulaire étant le rapport de la longueur latérale de la surface orientée vers le haut de la saillie triangulaire à la longueur latérale de sa surface orientée vers le bas, ou étant l'angle entre la surface orientée vers le bas de la saillie triangulaire et un écran. Chaque segment se présente sous la forme d'un arc sur l'écran, et ses rayons d'arc augmentent séquentiellement à partir du premier segment au N-ème segment. La structure d'écran de projection orthographique de courte longueur focale réduit la lumière ambiante entrant dans la couche de réflexion diffuse, réduisant ainsi l'impact de la lumière ambiante sur l'imagerie d'écran de projection orthographique.
PCT/CN2014/088258 2014-10-10 2014-10-10 Structure d'écran de projection orthographique de courte longueur focale Ceased WO2016054795A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/CN2014/088258 WO2016054795A1 (fr) 2014-10-10 2014-10-10 Structure d'écran de projection orthographique de courte longueur focale

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PCT/CN2014/088258 WO2016054795A1 (fr) 2014-10-10 2014-10-10 Structure d'écran de projection orthographique de courte longueur focale

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Cited By (3)

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CN106292154A (zh) * 2016-09-05 2017-01-04 重庆帝创光显电子科技有限公司 一种应用薄膜太阳能电池的正投光学微结构幕布
CN106338876A (zh) * 2016-09-05 2017-01-18 重庆帝创光显电子科技有限公司 一种应用钙钛矿薄膜太阳能电池的正投光学微结构幕布
CN112015040A (zh) * 2019-05-30 2020-12-01 深圳光峰科技股份有限公司 投影屏幕

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CN1367883A (zh) * 1998-07-09 2002-09-04 斯夫亚托斯拉夫·伊万诺维奇·阿森尼奇 投影系统
CN1461425A (zh) * 2001-02-14 2003-12-10 阿里萨娃欧普提克有限公司 反射型投影屏幕
WO2008139914A1 (fr) * 2007-05-09 2008-11-20 Kuraray Co., Ltd. Écran réflecteur et système d'affichage par projection vers l'avant
TW201017322A (en) * 2008-10-24 2010-05-01 Coretronic Corp Projection screen
EP2696243A2 (fr) * 2012-08-06 2014-02-12 Samsung Electronics Co., Ltd Écran pour appareil de projection frontale et son procédé de fabrication

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CN1367883A (zh) * 1998-07-09 2002-09-04 斯夫亚托斯拉夫·伊万诺维奇·阿森尼奇 投影系统
CN1294317A (zh) * 1999-11-01 2001-05-09 孙柏林 正投屏幕
CN2430721Y (zh) * 1999-11-18 2001-05-16 孙柏林 正投屏幕
CN1461425A (zh) * 2001-02-14 2003-12-10 阿里萨娃欧普提克有限公司 反射型投影屏幕
WO2008139914A1 (fr) * 2007-05-09 2008-11-20 Kuraray Co., Ltd. Écran réflecteur et système d'affichage par projection vers l'avant
TW201017322A (en) * 2008-10-24 2010-05-01 Coretronic Corp Projection screen
EP2696243A2 (fr) * 2012-08-06 2014-02-12 Samsung Electronics Co., Ltd Écran pour appareil de projection frontale et son procédé de fabrication

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106292154A (zh) * 2016-09-05 2017-01-04 重庆帝创光显电子科技有限公司 一种应用薄膜太阳能电池的正投光学微结构幕布
CN106338876A (zh) * 2016-09-05 2017-01-18 重庆帝创光显电子科技有限公司 一种应用钙钛矿薄膜太阳能电池的正投光学微结构幕布
CN106292154B (zh) * 2016-09-05 2018-09-18 南京福图信息科技有限公司 一种应用薄膜太阳能电池的正投光学微结构幕布
CN106338876B (zh) * 2016-09-05 2018-09-18 南京福图信息科技有限公司 一种应用钙钛矿薄膜太阳能电池的正投光学微结构幕布
CN112015040A (zh) * 2019-05-30 2020-12-01 深圳光峰科技股份有限公司 投影屏幕
US20220221780A1 (en) * 2019-05-30 2022-07-14 Appotronics Corporation Limited Projection screen
US11892765B2 (en) 2019-05-30 2024-02-06 Appotronics Corporation Limited Projection screen

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