WO2015045970A1 - 画像表示システム、及び、反射型スクリーン - Google Patents

画像表示システム、及び、反射型スクリーン Download PDF

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Publication number
WO2015045970A1
WO2015045970A1 PCT/JP2014/074457 JP2014074457W WO2015045970A1 WO 2015045970 A1 WO2015045970 A1 WO 2015045970A1 JP 2014074457 W JP2014074457 W JP 2014074457W WO 2015045970 A1 WO2015045970 A1 WO 2015045970A1
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WO
WIPO (PCT)
Prior art keywords
layer
particles
projector
reflective screen
reflective
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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/JP2014/074457
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English (en)
French (fr)
Japanese (ja)
Inventor
研吾 森安
裕貴 山田
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.)
Ushio Denki KK
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Ushio Denki KK
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Filing date
Publication date
Application filed by Ushio Denki KK filed Critical Ushio Denki KK
Publication of WO2015045970A1 publication Critical patent/WO2015045970A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • 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
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light
    • 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
    • G03B33/00—Colour photography, other than mere exposure or projection of a colour film
    • G03B33/06—Colour photography, other than mere exposure or projection of a colour film by additive-colour projection apparatus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources
    • 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 invention relates to an image display system for projecting an image from a projector using a laser as a light source onto a reflective screen, and a reflective screen.
  • an image display system having a projector using a laser as a light source and a reflective screen for projecting an image from the projector is known.
  • a laser is used as the light source of the projector, the laser light is highly coherent, so the light scattered by the screen interferes and the pattern of random bright and dark spots (speckle noise) on the screen. May occur.
  • speckle noise looks glaring with the naked eye, which may cause discomfort to the observer.
  • Patent Document 1 has a problem that a power source such as a motor is required to cause vibration on the screen, resulting in an increase in power consumption of the entire system.
  • a configuration having a drive unit such as a motor has a problem that the possibility of failure is high, a problem that noise is generated by vibration, and an uncomfortable feeling is given to an image viewer.
  • the present invention has been made in view of the above-described problems, and an object thereof is to easily reduce speckle noise without making the apparatus large.
  • An image display system of the present invention is an image display system comprising a projector using a laser as a light source, and a reflective screen for projecting an image from the projector,
  • the reflective screen has a transparent material transparent to visible light, a transflective layer in which particles having a refractive index different from that of the transparent material are dispersed, and a surface of the transflective layer opposite to the projector, And a reflective layer that reflects visible light.
  • the reflective screen has a translucent layer in which particles having a refractive index different from that of the transparent material are dispersed in a transparent material transparent to visible light, and is opposite to a projector having the transflective layer. And a reflective layer that reflects visible light. Accordingly, the laser light emitted from the projector is sequentially diffused in the process of passing through the inside of the semi-transmissive layer, and reflected to the viewer side by the reflective layer. As a result, the angle multiplicity of the laser beam is increased, and speckle can be reduced.
  • the speckle noise can be easily reduced without increasing the size of the device because the speckle is reduced by providing the transflective layer on the reflective screen. Become.
  • the particles are MgO, CaO, CaCO 3 , SrO, SrCO 3 , BaO, BaCO 3 , Al 2 O 3 , Sc 2 O 3 , Y 2 O 3 , TiO 2 , ZrO, ZnO. , B 2 O 3 , Al 2 O 3 , SiO 2 , SnO, and PbO are preferably at least one kind.
  • speckles can be more suitably reduced.
  • the reflective screen of the present invention is a reflective screen for projecting an image from a projector using a laser as a light source, A translucent layer in which particles having a refractive index different from that of the transparent material are dispersed in a transparent material transparent to visible light; And a reflective layer that reflects visible light.
  • the reflective screen has a translucent layer in which particles having a refractive index different from that of the transparent material are dispersed in a transparent material transparent to visible light, and is opposite to a projector having the transflective layer. And a reflective layer that reflects visible light. Accordingly, the laser light emitted from the projector is sequentially diffused in the process of passing through the inside of the semi-transmissive layer, and reflected to the viewer side by the reflective layer. As a result, the angle multiplicity of the laser beam is increased, and speckle can be reduced.
  • the speckle noise can be easily reduced without increasing the size of the device because the speckle is reduced by providing the transflective layer on the reflective screen. Become.
  • the particles are MgO, CaO, CaCO 3 , SrO, SrCO 3 , BaO, BaCO 3 , Al 2 O 3 , Sc 2 O 3 , Y 2 O 3 , TiO 2 , ZrO, ZnO. , B 2 O 3 , Al 2 O 3 , SiO 2 , SnO, and PbO are preferably at least one kind.
  • speckles can be more suitably reduced.
  • the image display system and the reflective screen of the present invention it is possible to easily reduce speckle noise without making the apparatus large.
  • FIG. 1 is a schematic diagram of an image display system according to the present embodiment. It is the schematic of the projection system used in the effect verification experiment. It is the schematic of the speckle measurement system used in the effect verification experiment.
  • FIG. 1 is a side sectional view schematically showing a reflective screen according to the present embodiment.
  • the reflective screen 10 has a configuration in which a reflective layer 12 and a semi-transmissive layer 14 are laminated.
  • laser light is irradiated from the semi-transmissive layer 14 side (left side in FIG. 1), and the light is sequentially diffused in the process of passing through the semi-transmissive layer 14. Is reflected.
  • the reflective layer 12 and the semi-transmissive layer 14 are laminated without interposing another layer will be described.
  • the other layer is not deviated from the scope of the present invention. It may be interposed between them.
  • the reflective screen 10 is preferably one that can be wound into a roll from the viewpoint of storage, transportation, and the like. From such a viewpoint, each member constituting the reflective screen 10 is preferably formed of a material having some degree of flexibility.
  • the reflection layer 12 is a layer that reflects the laser light from the projector and reflects the image light so that the observer on the projector side can observe it as an image.
  • the reflective layer 12 the same material as that used in a conventionally known reflective screen can be used. Specifically, for example, a mat-finished fabric coated with a white paint or the like, and a mat-finished resin sheet can be used. Other specific examples include a metal layer formed by vapor deposition or the like, or a layer made of a reflective paint sprayed by spray coating.
  • the semi-transmissive layer 14 particles having a refractive index different from that of the transparent material are dispersed in a transparent material transparent to visible light.
  • transparent to visible light means that when the transparent material is formed into a film having a film thickness of 1 mm, the light transmittance is 70 in all wavelength ranges within a wavelength range of 400 to 760 nm. % Or more.
  • the transparent material include polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride, polystyrene, ABS resin, acrylic resin, polycarbonate, acrylonitrile, epoxy resin, unsaturated polyester resin, polyimide resin, silicone resin, diallyl phthalate resin,
  • polyurethane resins ultraviolet curable urethane acrylate resins, ultraviolet curable epoxy acrylate resins, and ultraviolet curable polyester acrylate resins.
  • polyvinyl chloride is preferred from the viewpoints of durability, ease of processing, and ease of dispersion of the particles.
  • the particle is not particularly limited as long as it has a refractive index different from that of the transparent material. This is because laser light can be scattered if the refractive index is different from that of the transparent material.
  • the particles include MgO, CaO, CaCO 3 , SrO, SrCO 3 , BaO, BaCO 3 , Al 2 O 3 , Sc 2 O 3 , Y 2 O 3 , TiO 2 , ZrO, ZnO, B 2 O 3 , Al. 2 O 3, SiO 2, SnO , and is preferably at least one or more consisting of the group of PbO.
  • speckles can be more suitably reduced.
  • TiO 2 and Al 2 O 3 are preferable from the viewpoint of whiteness and durability.
  • the addition amount of the particles is preferably 0.3 to 5% by volume when the transparent material is 100% by volume.
  • the amount of the particles added is 0.3 to 5% by volume when the transparent material is 100% by volume, a speckle suppression effect can be suitably obtained.
  • the average particle size of the particles is preferably in the range of 500 nm to 30 ⁇ m, and more preferably in the range of 1 ⁇ m to 25 ⁇ m.
  • the average particle size of the particles is preferably in the range of 500 nm to 30 ⁇ m, and more preferably in the range of 1 ⁇ m to 25 ⁇ m.
  • the maximum particle size of the particles is preferably 50 ⁇ m or less, and more preferably 40 ⁇ m or less. By setting the maximum particle size to 50 ⁇ m or less, it can be made difficult to visually recognize with the naked eye, and deterioration of image quality can be suppressed.
  • the minimum particle size of the particles is preferably 100 nm or more, and more preferably 250 nm or more. By setting the minimum particle diameter to 100 nm or more, it is possible to suppress the occurrence of Rayleigh scattering in which the scattering characteristics easily change depending on the wavelength.
  • the thickness of the semi-transmissive layer 14 is preferably in the range of 0.1 to 3 mm, and more preferably in the range of 0.2 to 1 mm. By setting the thickness of the semi-transmissive layer 14 to 0.1 mm or more, an effect of suppressing speckles can be suitably obtained. In addition, by setting the thickness of the semi-transmissive layer 14 to 3 mm or less, a certain degree of strength can be ensured and the handleability is excellent.
  • the relationship between the intensity Iin of light traveling in the layer in the vertical direction from the surface and the position d in the depth direction from the surface preferably satisfies the following formula (1).
  • ⁇ Formula (1)> log (Iin) ad + b (a and b are constants)
  • the fact that the semipermeable membrane layer 14 satisfies the above formula (1) means that when the depth from the surface is, for example, d1, d2, d3..., The surfaces of the depths d1, d2, d3. (For example, 20% of the laser light reaching the surface of depth d1 is diffused, 20% of the laser light reaching the surface of depth d2 is diffused, and depth d3) This means that 20% of the laser light reaching the surface is diffused). Therefore, when the semipermeable membrane layer 14 satisfies the above formula (1), the angle multiplicity of the laser beam becomes larger, and speckle can be further reduced.
  • Examples of the method for producing the semipermeable membrane layer 14 so that the semipermeable membrane layer 14 satisfies the above formula (1) include a method of uniformly dispersing the particles in the transparent material.
  • a method of dispersing the transparent material with a gradation so that particles having a large particle size among the particles have a small number density and particles having a small particle size to have a large number density may be mentioned. be able to.
  • the semipermeable membrane layer 14 is manufactured.
  • a method for producing the semipermeable membrane layer 14 is not particularly limited, and examples thereof include a method in which the particles are dispersed in the transparent material, and the obtained dispersion is applied in a sheet form.
  • various kinds of mixers such as a dissolver and a homogenizer, a kneader, a roll, a bead mill, a self-revolving stirrer and the like can be used. Further, when dispersing, a solvent may be used, and after coating in a sheet form, it may be dried.
  • a conventionally known screen having the reflective layer 12 is prepared, and the semipermeable membrane layer 14 is bonded onto the reflective layer 12. Bonding can be performed by pressure bonding. At this time, pressure bonding may be performed while heating (for example, 30 to 150 ° C.).
  • the reflective screen 10 has been described above.
  • FIG. 2 is a schematic diagram of the image display system according to the present embodiment.
  • the image display system 50 includes a projector 20 and a reflective screen 10.
  • a projector using a laser as a light source is adopted as the projector.
  • a projector using a laser as a light source a conventionally known projector can be employed.
  • the projector 20 includes a laser light source 50 including a red laser light source 50R, a green laser light source 50G, and a blue laser light source 50B, a dichroic mirror 52, a lens 54, a rod integrator 56, and a lens 58. , A mirror 60, a light modulation element 62, and a projection lens 64.
  • the laser light emitted from the red laser light source 50R, the green laser light source 50G, and the blue laser light source 50B is synthesized by the dichroic mirror 52.
  • the light synthesized by the dichroic mirror 52 is collected by the lens 54 and is incident on the rod integrator 56.
  • the rod integrator 56 the light intensity distribution is made uniform.
  • an image of the end surface of the rod integrator 56 is formed on the reflection type light modulation element 62 using the lens 58 and the mirror 60, and the image formed by the light modulation element 62 is reflected by the projection lens 64. Projected on top.
  • the reflective screen 10 includes a translucent layer 14 in which particles having a refractive index different from that of the transparent material are dispersed in a transparent material transparent to visible light, and the projector 20 of the transflective layer 14.
  • a reflective layer 12 that reflects visible light is provided on the opposite surface side. Therefore, the laser light emitted from the projector 20 is sequentially diffused in the process of passing through the semi-transmissive layer 14 and reflected by the reflective layer 12 toward the viewer (projector 20 side). As a result, the angle multiplicity of the laser beam is increased, and speckle can be reduced.
  • the reflective screen 10 is provided with the semi-transmissive layer 14 to reduce speckles. In addition, speckle noise can be reduced.
  • the case where the laser light source included in the projector is three colors of red, green, and blue has been described.
  • the projector only needs to have at least one laser light source, The number may be different.
  • the optical system is not limited to that shown in FIG. 2, and the number and position of mirrors and lenses may be different.
  • the case where the rod integrator 56 is used as a means for making the light uniform has been described, but a fly-eye lens may be used.
  • the case where the reflection type element is used as the light modulation element has been described, but a transmission type element may be used.
  • FIG. 3 is a schematic diagram of the projection system used in the effect verification experiment.
  • Example 1 In the verification experiment of the speckle suppression effect, as shown in FIG. 3, the laser light emitted from the laser light source 70 enters the optical fiber 72, and the hexagonal prism integrator 74 attached to the output end of the optical fiber 72. The light intensity distribution was made uniform. An image of the end face of the rod integrator 74 was projected on the screen 80 at a magnification of about 100 times using the lens 76 and the lens 78. The characteristics of each member used for the projection experiment on the screen 80 are as follows.
  • Laser light source 70 center wavelength 532 nm, half-value width 0.2 nm, beam intensity: 2 W
  • Rod integrator 74 hexagonal prism shape, opposite side dimension 2 mm, length 50 mm
  • Lens 76 (rod integrator side): Focal length 7.9 mm, installed at 7.9 mm from rod integrator Lens 78 (screen side): Focal length 750 mm, installed at 750 mm from screen
  • the screen 80 was prepared as follows. First, a semipermeable membrane layer was manufactured.
  • the semipermeable membrane layer is produced by preparing a raw material in which Al 2 O 3 particles and TiO 2 particles are sufficiently mixed with a vinyl chloride resin, then heating and melting at 200 ° C., and extruding the softened material from the slit. It processed into the sheet
  • the additive amount of Al 2 O 3 particles was 4% by weight with respect to the entire semipermeable membrane layer, and the additive amount of TiO 2 particles was 1% by weight with respect to the entire semipermeable membrane layer.
  • the particle diameter of the added Al 2 O 3 particles and the particle diameter of the TiO 2 particles are as follows.
  • Al 2 O 3 average particle size: 8 ⁇ m, minimum particle size of 0.2 ⁇ m, maximum of 20 ⁇ m
  • TiO 2 Average particle size: 8 ⁇ m, minimum particle size of 0.2 ⁇ m, maximum of 20 ⁇ m
  • the linear transmittance of the manufactured semi-transmissive layer was 40%.
  • the linear transmittance means the ratio of the intensity of light transmitted in the direction perpendicular to the screen to the intensity of light incident in the direction perpendicular to the screen.
  • Linear transmission decreases as the angle of the light beam changes due to scattering.
  • the linear transmittance is too low, most of the light is scattered only on the surface of the semi-transmissive layer, the effect of multiplexing is reduced, and the effect of reducing speckle is reduced.
  • the linear transmittance is too high, most of the light rays are reflected by the reflective layer on the back surface, so that the effect of angle multiplexing is reduced and the speckle reduction effect is reduced.
  • the linear transmittance is 40%, it is suitable as a condition for obtaining a speckle reduction effect.
  • the linear transmittance of the semi-transmissive layer is preferably in the range of 20 to 60%.
  • Stagelite Matt White 100 (corresponding to the reflective layer of the present invention) manufactured by Harkness Screen was prepared, and the semipermeable membrane layer produced on the reflective layer was bonded. Bonding was performed by pressure bonding at 60 ° C.
  • FIG. 4 is a schematic diagram of the speckle measurement system used in the effect verification experiment.
  • the image projected on the screen 80 was taken by the CCD camera 82 from a direction of 15 degrees with respect to the direction in which the screen 80 is viewed vertically.
  • An aperture 86 having a diameter of 1 mm was installed in front of the camera lens 84.
  • the distance between the CCD camera 82 and the screen 80 was 700 mm.
  • the CCD camera 82 was controlled by a measurement computer 88.
  • An average value A and a standard deviation ⁇ of the signal intensity in the photographed photographing surface were obtained, and speckle contrast ⁇ / A was calculated. As a result, the speckle contrast was 9.9%.
  • Example 1 (result)
  • Comparative Example 1 confirmed the speckle suppression effect due to the use of the semi-transmissive layer.
  • the present invention is not limited to the above-described example, and it is possible to make design changes as appropriate within a range that satisfies the configuration of the present invention.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Projection Apparatus (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Optical Elements Other Than Lenses (AREA)
PCT/JP2014/074457 2013-09-25 2014-09-17 画像表示システム、及び、反射型スクリーン Ceased WO2015045970A1 (ja)

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JP2013197825A JP5794435B2 (ja) 2013-09-25 2013-09-25 画像表示システム、及び、反射型スクリーン

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017203977A (ja) * 2016-03-29 2017-11-16 日華化学株式会社 反射型スクリーン及び映像表示システム

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JPH0980626A (ja) * 1995-09-13 1997-03-28 Toppan Printing Co Ltd プロジェクションスクリーン
JPH09230506A (ja) * 1996-02-28 1997-09-05 Toppan Printing Co Ltd 反射型スクリーン
WO2006123613A1 (ja) * 2005-05-17 2006-11-23 Matsushita Electric Industrial Co., Ltd. レーザ画像表示装置およびレーザ画像表示スクリーン
JP2008065026A (ja) * 2006-09-07 2008-03-21 Teijin Fibers Ltd 映写用スクリーン
JP2010204460A (ja) * 2009-03-04 2010-09-16 Kinki Education Center:Kk リバーシブルスクリーン
JP2012252112A (ja) * 2011-06-01 2012-12-20 Dainippon Printing Co Ltd 反射スクリーンおよびその製造方法

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JP2970064B2 (ja) * 1991-06-14 1999-11-02 大日本印刷株式会社 反射型映写スクリーン
JP2006259575A (ja) * 2005-03-18 2006-09-28 Kimoto & Co Ltd スクリーン
JP2010145770A (ja) * 2008-12-19 2010-07-01 Seiko Epson Corp スクリーン及びその製造方法
JP2011164537A (ja) * 2010-02-15 2011-08-25 Fine Rubber Kenkyusho:Kk ディスプレイ装置
JP5828228B2 (ja) * 2011-06-01 2015-12-02 大日本印刷株式会社 反射型スクリーン、及び反射型投射システム
JP2013156373A (ja) * 2012-01-27 2013-08-15 Dainippon Printing Co Ltd 反射スクリーンの製造方法

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Publication number Priority date Publication date Assignee Title
JPH0980626A (ja) * 1995-09-13 1997-03-28 Toppan Printing Co Ltd プロジェクションスクリーン
JPH09230506A (ja) * 1996-02-28 1997-09-05 Toppan Printing Co Ltd 反射型スクリーン
WO2006123613A1 (ja) * 2005-05-17 2006-11-23 Matsushita Electric Industrial Co., Ltd. レーザ画像表示装置およびレーザ画像表示スクリーン
JP2008065026A (ja) * 2006-09-07 2008-03-21 Teijin Fibers Ltd 映写用スクリーン
JP2010204460A (ja) * 2009-03-04 2010-09-16 Kinki Education Center:Kk リバーシブルスクリーン
JP2012252112A (ja) * 2011-06-01 2012-12-20 Dainippon Printing Co Ltd 反射スクリーンおよびその製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017203977A (ja) * 2016-03-29 2017-11-16 日華化学株式会社 反射型スクリーン及び映像表示システム
JP7044472B2 (ja) 2016-03-29 2022-03-30 日華化学株式会社 反射型スクリーン及び映像表示システム

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