WO2012063428A1 - Dispositif d'affichage d'images - Google Patents

Dispositif d'affichage d'images Download PDF

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Publication number
WO2012063428A1
WO2012063428A1 PCT/JP2011/006106 JP2011006106W WO2012063428A1 WO 2012063428 A1 WO2012063428 A1 WO 2012063428A1 JP 2011006106 W JP2011006106 W JP 2011006106W WO 2012063428 A1 WO2012063428 A1 WO 2012063428A1
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WO
WIPO (PCT)
Prior art keywords
image display
display device
optical system
plane mirror
incident
Prior art date
Application number
PCT/JP2011/006106
Other languages
English (en)
Japanese (ja)
Inventor
正直 川名
Original Assignee
富士フイルム株式会社
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 富士フイルム株式会社 filed Critical 富士フイルム株式会社
Publication of WO2012063428A1 publication Critical patent/WO2012063428A1/fr

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Classifications

    • 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
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • 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
    • G03B21/28—Reflectors in projection beam

Definitions

  • the present invention relates to an image display device, and more particularly to an image display device including a projection optical system in which a refractive optical system and a reflective optical system are arranged.
  • image display apparatuses that enlarge and project an image to be projected formed on an image forming element such as a liquid crystal panel onto a projection surface (screen or the like) have been commercialized and widely spread.
  • image display device in order to shorten the distance (projection distance) between the screen and the image display device body, the projection optical system is widened and the propagation direction of the projection light is tilted with respect to the optical axis of the projection optical system.
  • a small-sized image display device having an oblique projection configuration.
  • the image display device described in Patent Document 1 shifts the image forming element and the screen in directions opposite to each other with respect to the optical axis of the projection optical system, thereby reducing the projection distance. Projection of images with less distortion is realized.
  • This image display apparatus has a positive power for reflecting and condensing light emitted from a light source and passing through an image forming element (for example, a liquid crystal panel), and reflected and condensed by the condensing mirror.
  • a plane mirror that reflects and bends the light.
  • an image display apparatus having such a configuration of oblique projection has advantages that the apparatus size is small and the projection distance is short. .
  • the density distribution of the image formed on the image forming element may differ from the density distribution of the image enlarged and projected on the screen. For example, even when an image having a constant density distribution is formed on the image forming element, the density distribution of the image obtained by enlarging and projecting the image on the screen is not constant, and the density on the upper side of the screen is the lower density. A higher state may be visually recognized.
  • the present invention has been made in view of the above circumstances, and provides an image display device capable of suppressing density unevenness of a projected image without increasing the device size or increasing the projection distance. It is for the purpose.
  • An image display device includes a projection optical system in which a refractive optical system and a reflective optical system are arranged in order from the reduction side, and displays an image emitted from an image forming element and passing through the projection optical system
  • the reflection optical system has a plane mirror for bending the optical path for folding the optical path through which the light beam passes, and only the light beam incident on the plane mirror with S-polarized light is used for the projection.
  • S-polarized light incident means is provided, and the incident angle of the principal ray with respect to the plane mirror in at least a part of the light beam incident on the plane mirror with S-polarized light is 60 degrees or more.
  • the S-polarized light incident means can be a polarizing plate or a polarizing beam splitter.
  • the reflection optical system includes a concave aspherical reflection mirror having a positive power and a plane mirror in order from the reduction side, and a light beam emitted from the refractive optical system and reflected by the concave aspheric reflection mirror is flat. It may be configured to be reflected by a mirror.
  • the projection optical system When the projection optical system is positioned so that the reflecting surface of the plane mirror faces vertically upward, the reflecting surface of the plane mirror is above the optical axis of the refractive optical system and / or the upper end of the effective area of the image forming element. It is desirable to be configured to be located in
  • the reflecting surface of the flat mirror may be formed of an aluminum member.
  • the reflective surface formed of the aluminum member may be provided with a protective coat.
  • the reflection surface of the flat mirror may be formed of a silver member.
  • the reflective surface formed of the silver member may be provided with a protective coat.
  • the reflection surface of the flat mirror may be formed of a copper member.
  • the reflective surface formed of the copper member may be provided with a protective coat.
  • a light beam incident on a plane mirror with S-polarized light means a light beam incident on the plane mirror so that an electric field vector becomes S-polarized light.
  • a light beam having both a light flux component that is S-polarized light and a light flux component that is not S-polarized light is incident on the plane mirror, only the component that becomes S-polarized light is applied to the plane mirror.
  • the light beam is S-polarized light incident on the plane mirror.
  • the light whose electric field vector vibrates in the incident plane is P-polarized light
  • the light which vibrates perpendicular to the incident plane is S-polarized light.
  • the incident surface is a plane that passes through the optical path of the incident light to the plane mirror and the optical path of the reflected light.
  • the effective area of the image forming element is an area in the image forming element where a light beam used for the projection is emitted.
  • the projection optical system in which the refractive optical system and the reflection optical system are arranged in order from the reduction side is provided, and the light flux that has passed through the projection optical system emitted through the image forming element is reflected.
  • the incident angle of the principal ray of the light beam with respect to the plane mirror (hereinafter, also referred to as the incident angle of the light beam) is less than 60 degrees and 0 degrees or more, the reflectance of the light beam incident on the plane mirror with S-polarized light. Increases monotonously as the incident angle increases, and the reflectivity of the light beam incident on the P-polarized light decreases monotonously as the incident angle increases, and the changes in both reflectivities are substantially the same.
  • the incident angle of the light beam with respect to the plane mirror is in the range of 60 degrees or more and 90 degrees or less, the change in the reflectance of the light beam incident on the P-polarized light is greater than the change in the reflectance of the light beam incident on the flat mirror. Much bigger.
  • the density unevenness of the image projected using the light beam incident on the plane mirror with P-polarized light in the range where the incident angle with respect to the plane mirror is 60 degrees or more and 90 degrees or less becomes very large. It is desirable not to use the luminous flux that has been P-polarized and incident on the plane mirror within the range where the angle is 60 degrees or more, for image projection.
  • the image display device is configured such that the incident angle of the principal ray with respect to the plane mirror in at least a part of the light beam incident on the plane mirror with S-polarized light is 70 degrees or more, the incident angle is 60 degrees. It is possible to enjoy a greater effect than that configured as described above.
  • the image display device is configured so that the incident angle of the principal ray with respect to the plane mirror in at least some of the light beams incident on the plane mirror with S-polarized light is 80 degrees or more, the incident angle is 70 degrees. It is possible to enjoy a greater effect than that configured as described above.
  • the configuration in which the incident angle to the plane mirror is 60 ° or more is maintained in order to prevent the apparatus size from being increased and the projection distance from being increased. Therefore, it is possible to project an image in which density unevenness is suppressed as compared with the conventional case.
  • FIG. 1 is a diagram showing a schematic configuration of an image display apparatus according to an embodiment of the present invention.
  • An image display apparatus 300 (also referred to as a projector) according to the embodiment of the present invention shown in FIG. 1 includes an optical engine 110 and a projection optical system 200 arranged on a base table 150.
  • the projection optical system 200 includes a refractive optical system 210 and a reflective optical system 290 in order from the reduction side.
  • the image display device 300 projects a light beam emitted from the image forming element 110A housed in the optical engine 110 and passed through the projection optical system 200 onto the projection surface 401 of the screen 400.
  • the refractive optical system 210 is formed by arranging a plurality of lenses.
  • the reflection optical system 290 includes a concave aspherical reflection mirror 220, a plane mirror 230, and a support part 240 that supports the plane mirror 230.
  • the plane mirror 230 is an optical path bending plane mirror that bends the optical path through which the light beam passes, and the reflection surface 230H may be formed of a metal member (aluminum, silver, copper, etc.).
  • the reflection surface 230H is preferably formed by applying a protective coating to an aluminum member or silver member having good reflection characteristics.
  • the concave aspherical reflecting mirror 220 has a positive power, the reflecting surface 220H forms a concave surface, and this concave surface forms an aspherical shape.
  • the image display device 300 uses only the light beam incident on the plane mirror 230 as S-polarized light in the light path between the optical engine 110 and the projection optical system 200 for projection onto the screen 400.
  • a polarizing element 280 which is S-polarized light incident means is provided.
  • the polarizing element 280 for example, a polarizing plate or a polarizing beam splitter can be adopted.
  • This image display apparatus 300 is configured such that the incident angle of the principal ray with respect to the plane mirror 230 in at least a part of the light beam incident on the plane mirror 230 with S-polarized light is 60 degrees or more. More specifically, as shown in FIG. 1, here, the minimum value ⁇ 1 of the incident angle of the chief ray in the light beam incident on the flat mirror 230 and incident on the screen 400 and projected onto the screen 400 is 36. The maximum value ⁇ 2 is 72 degrees.
  • An optical engine 110 having an image forming element 110A is disposed on the base table 150, and the optical engine 110 generates a video light beam that is modulated according to a video signal.
  • an image is formed on the image forming element 110A by a video signal input to the image forming element 110A, which is a liquid crystal panel, and the image forming element that has been irradiated with the irradiation light emitted from the illumination unit 110B.
  • a light beam representing the image is emitted from 110A.
  • the image light beam generated by the optical engine 110 enters the refractive optical system 210 through the polarizing element 280.
  • the center of the effective display area is below the optical axis Z1 of the refractive optical system 210 (the side opposite to the screen 400, arrow -Y in the figure). It is arranged so as to be shifted by a predetermined distance d on the direction side).
  • the concave aspheric reflecting mirror 220 is disposed on the opposite side to the center position of the effective area (effective display area) of the image forming element 110A with the optical axis Z1 of the refractive optical system 210 interposed therebetween.
  • the image light flux that has passed through the refractive optical system 210 is reflected and converged on the optical axis Z1 side (the arrow-Y direction side in the figure) by the concave aspherical reflecting mirror 220.
  • the reflecting surface 230H has the optical axis Z1 of the refractive optical system 210 and / Or located above the upper end of the effective area of the image forming element 110A (the arrow in the effective area in the figure plus the arrow in the Y direction) (the arrow in the figure in the arrow Y direction).
  • the flat mirror 230 is disposed on the concave aspherical reflection mirror 220 side (the arrow + Y direction side) from the convergence position F1 of the image light beam reflected and converged by the concave aspherical reflection mirror 220.
  • the plane mirror 230 is fixed on the support 240 so that the reflection surface 230H of the plane mirror 230 is substantially parallel to the optical axis Z1 and substantially orthogonal to the projection surface 401 of the screen 400. ing.
  • the position of the plane mirror 230 is made as close as possible to the convergence position F1. Is preferred.
  • the plane mirror 230 when the position of the plane mirror 230 is brought close to the convergence position F1, the plane mirror 230 approaches the refractive optical system 210, so that the image light beam reflected by the plane mirror 230 may be blocked by the refractive optical system 210. Therefore, the plane mirror 230 is arranged so that the image light beam reflected by the plane mirror 230 is projected onto the screen 400 without being blocked by the refractive optical system 210. Of course, if the image light beam reflected by the plane mirror 230 is not blocked by the refractive optical system 210, the plane mirror 230 may be disposed at the convergence position F1.
  • the image light beam generated by the optical engine 110 passes through the refractive optical system 210 and is reflected and converged by the concave aspheric reflection mirror 220, and further, the light beam is reflected by the plane mirror 230.
  • the light beam reflected by the plane mirror 230 propagates from the refractive optical system 210 so as to intersect the optical path of the image light beam toward the concave aspherical reflection mirror 220, and is disposed above the image display device 300. 400 is projected.
  • a transmissive liquid crystal panel, a reflective liquid crystal panel, a DMD (digital micromirror device), or the like can be employed as the image forming element 110A disposed in the optical engine 110.
  • the S-polarized light incident means is not limited to a polarizing element such as a polarizing plate or a polarizing beam splitter, and any system may be employed.
  • a liquid crystal panel is employed as the image forming element 110A.
  • the liquid crystal panel can also serve as S-polarized light incident means.
  • the illumination unit that illuminates the DMD can be S-polarized light incident means.
  • FIG. 2 shows the reflectivity with respect to a change in the incident angle of a light beam incident on a plane mirror with S-polarized light and a light beam incident with P-polarized light on a coordinate plane with the vertical axis representing the reflectance and the horizontal axis defining the incident angle. It is a figure which shows a change (reflectance distribution).
  • a reflectance distribution of a light beam incident on the plane mirror 230 with S-polarized light in the range of 0 to 90 degrees is indicated by a symbol So, and the polarized light is applied to the plane mirror 230 in the range of 0 to 90 degrees.
  • the reflectance distribution of the incident light beam is indicated by symbol Po.
  • a reflectance distribution LSP obtained by averaging the reflectance distribution of the light beam incident on the plane mirror 230 with the S-polarized light and the reflectance distribution of the light beam incident on the plane mirror 230 with the P-polarized light is indicated by a broken line.
  • the reflectance of the light beam incident on the plane mirror 230 with S-polarized light monotonously increases with the increase in the incident angle, and P-polarized light enters the plane mirror 230.
  • the reflectance of the emitted light beam decreases monotonously as the incident angle increases.
  • the reflectance distribution Sa of the light flux incident on the plane mirror 230 with S-polarized light and for each incident angle of 0 ° or more and less than 60 °, P is applied to the plane mirror 230.
  • the reflectance distribution Pa of the light beam incident on the polarized light corresponds to the light intensity distribution of each light beam projected on the screen 400.
  • the density distribution of the image obtained by projecting only the reflected light of the light beam incident on the S-polarized light on the screen 400 corresponds to the reflectance distribution Sa, and only the reflected light of the light beam incident on the P-polarized light is projected on the screen 400.
  • the density distribution of the obtained image corresponds to the reflectance distribution Pa.
  • the density distribution of an image obtained by projecting both the reflected light of the S-polarized light beam and the reflected light of the P-polarized light beam onto the plane mirror 230 onto the screen 400 is the reflectance distribution Sa and the reflectance distribution. It corresponds to the reflectance distribution obtained by adding Pa, and the increase / decrease in the reflectance due to the incident angle is canceled out to obtain a substantially constant density distribution (refer to the reflectance distribution LSP obtained by averaging in FIG. 2).
  • the reflectance distribution Sb of the light beam incident on the plane mirror 230 with S-polarized light and the reflectance distribution Pb of the light beam incident with P-polarized light are the screen. This corresponds to the light intensity distribution of the light beam projected onto 400.
  • the change in the reflectance distribution Pb at the incidence of P-polarized light is much larger than the change in the reflectance distribution Sb at the incidence of S-polarized light.
  • the light beam projected onto the screen 400 includes a light beam having an incident angle on the flat mirror 230 of 60 ° or more, only the light beam that has been S-polarized incident on the flat mirror 230 is used (that is, the flat mirror). If the projection onto the screen 400 is performed (without using the light beam incident on the P-polarized light 230), the density unevenness of the image projected on the screen 400 can be more reliably suppressed.
  • the present invention is not limited to the above-described embodiment, and various modifications can be made without changing the gist of the invention.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)

Abstract

La présente invention vise à supprimer les irrégularités de consistance des images de projection dans un dispositif d'affichage d'images, sans augmenter la dimension du dispositif ou la distance de projection. Vue tout d'abord d'un côté limité, l'invention prévoit un dispositif d'affichage d'images comprenant un système optique de projection (200) équipé d'un système dioptrique (210) et d'un système catoptrique (220), le système catoptrique (220) possédant un miroir plan d'inflexion du trajet lumineux (230) destiné à infléchir le trajet lumineux d'un flux passant au travers, le dispositif comprenant des moyens de polarisation s (280) qui permettent d'utiliser pour la projection uniquement le flux ayant une polarisation s par rapport au miroir plan (230). L'angle d'incidence par rapport au miroir plan (230) d'au moins une partie du flux ayant une polarisation s sur le miroir plan (230) est prévu pour être supérieur ou égal à 60°, et projette le flux, qui est émis par un élément de formation d'image (110A) et passe à travers le système optique de projection (200).
PCT/JP2011/006106 2010-11-12 2011-11-01 Dispositif d'affichage d'images WO2012063428A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-253717 2010-11-12
JP2010253717 2010-11-12

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WO2012063428A1 true WO2012063428A1 (fr) 2012-05-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112334830A (zh) * 2018-07-05 2021-02-05 索尼公司 图像显示设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004325951A (ja) * 2003-04-25 2004-11-18 Central Glass Co Ltd 投射型表示装置
JP2007041607A (ja) * 2006-08-28 2007-02-15 Hitachi Ltd 投写用光学装置
JP2009204846A (ja) * 2008-02-27 2009-09-10 Ricoh Co Ltd 投射光学系・画像表示装置
JP2010002885A (ja) * 2008-05-22 2010-01-07 Sanyo Electric Co Ltd 投写型映像表示装置
JP2011107295A (ja) * 2009-11-16 2011-06-02 Ricoh Co Ltd 投射光学系、画像表示装置及び画像表示システム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004325951A (ja) * 2003-04-25 2004-11-18 Central Glass Co Ltd 投射型表示装置
JP2007041607A (ja) * 2006-08-28 2007-02-15 Hitachi Ltd 投写用光学装置
JP2009204846A (ja) * 2008-02-27 2009-09-10 Ricoh Co Ltd 投射光学系・画像表示装置
JP2010002885A (ja) * 2008-05-22 2010-01-07 Sanyo Electric Co Ltd 投写型映像表示装置
JP2011107295A (ja) * 2009-11-16 2011-06-02 Ricoh Co Ltd 投射光学系、画像表示装置及び画像表示システム

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112334830A (zh) * 2018-07-05 2021-02-05 索尼公司 图像显示设备
US11287665B2 (en) 2018-07-05 2022-03-29 Sony Corporation Image display apparatus

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