WO2024038589A1 - 空中像表示装置および表示方法 - Google Patents

空中像表示装置および表示方法 Download PDF

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Publication number
WO2024038589A1
WO2024038589A1 PCT/JP2022/031406 JP2022031406W WO2024038589A1 WO 2024038589 A1 WO2024038589 A1 WO 2024038589A1 JP 2022031406 W JP2022031406 W JP 2022031406W WO 2024038589 A1 WO2024038589 A1 WO 2024038589A1
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WO
WIPO (PCT)
Prior art keywords
optical member
optical
polarized light
viewer
image
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/JP2022/031406
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English (en)
French (fr)
Japanese (ja)
Inventor
誉宗 巻口
文香 佐野
崇裕 松元
隆二 山本
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.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to PCT/JP2022/031406 priority Critical patent/WO2024038589A1/ja
Priority to JP2024541382A priority patent/JP7740562B2/ja
Publication of WO2024038589A1 publication Critical patent/WO2024038589A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/50—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a three-dimensional [3D] volume, e.g. voxels
    • G02B30/56—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a three-dimensional [3D] volume, e.g. voxels by projecting aerial or floating images
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements

Definitions

  • One aspect of the present invention relates to an aerial image display device and display method used to display, for example, a real image displayed on a display as a virtual image in the air.
  • a transparent resin film having a refractive index different from that of air is used as the beam splitter, and tension is applied to this transparent resin film to prevent wrinkles or loosening.
  • tension is applied to this transparent resin film to prevent wrinkles or loosening.
  • a method has been proposed in which a thick, self-supporting transparent plate such as a glass plate or an acrylic plate is used as a beam splitter instead of a transparent resin film, and the transparent plate is arranged diagonally with respect to the display. Using this method, it is possible to display an aerial image with simple construction and less distortion.
  • the incident light emitted from the display is reflected on the front and back surfaces of the beam splitter, resulting in two identical virtual images being displayed. In other words, a double image is displayed, which causes a deterioration in the display quality of the aerial image.
  • This invention has been made in view of the above circumstances, and aims to provide a technology that suppresses the occurrence of double images and makes it possible to display high-quality aerial images.
  • an aerial image display device includes a display device that displays an optical image, and a display screen of the display device that is arranged to face the display screen of the display device at a predetermined angle of inclination. a first optical member that transmits a part of the optical image and reflects a part of the optical image; and a state in which the first optical member is in close contact with a second surface that is the back side of the first surface facing the display screen.
  • a second optical member configured to transmit a first polarized light component and reflect a second polarized light component among the polarized light components of the optical image transmitted through the first optical member;
  • the and a third optical member that transmits only the first polarized light component.
  • the optical image displayed on the display device is partially reflected toward the viewer by the first optical member made of, for example, a half mirror, and then reflected by the third optical member to the first optical member. Only the polarized light component of is transmitted and is visually recognized by the viewer.
  • the optical image that has passed through the first optical member among the above-mentioned optical images is converted into a second polarized light component by a second optical member having reflective polarization characteristics and closely disposed on the back side of the first optical member. only is reflected. Therefore, the reflected optical image of only the second polarized light component does not pass through the third optical member and is not visible to the viewer.
  • the optical image reflected by the back surface only contains the second polarized component, so it does not pass through the third optical member. It is not visible to the viewer. Therefore, even if a thick first optical member is used, the occurrence of double images is suppressed, thereby making it possible to display high-quality aerial images.
  • FIG. 1 is a diagram showing an example of the configuration of an aerial image display device according to a first embodiment of the present invention.
  • FIG. 2 is an enlarged view of the beam splitter of the aerial image display device shown in FIG.
  • FIG. 3 is a diagram showing a modification of the beam splitter shown in FIG. 2.
  • FIG. 4 is a diagram showing an example of the configuration of an aerial image display device according to a second embodiment of the invention.
  • FIG. 5 is a diagram showing an example of the configuration of an aerial image display device according to a third embodiment of the present invention.
  • FIG. 6 is a diagram used to explain the effects of the aerial image display device according to the first embodiment.
  • FIG. 1 is a diagram showing an example of the configuration of an aerial image display device according to a first embodiment of the present invention
  • D1 indicates a display of the display device.
  • the display D1 uses, for example, a liquid crystal panel, an organic EL panel, or an LED panel, and displays display information that is the source of an aerial image.
  • the display information may be video information representing any of people, animals, plants, and objects, or may be context information representing news, subtitles, and the like.
  • a beam splitter 2 as a first optical member is arranged so as to be inclined at a predetermined angle, for example, 45 degrees or close to the display direction, with respect to the display direction.
  • the beam splitter 2 is made of a transparent plate made of, for example, acrylic or glass, and has an optical property of transmitting a portion of incident light and reflecting a portion of the incident light.
  • a reflective polarizing film 3 as a second optical member is provided with no air layer interposed therebetween.
  • the reflective polarizing film 3 is made of, for example, a wire grid polarizer, and has an optical characteristic of transmitting, for example, a P-polarized light component and reflecting an S-polarized light component among the polarized light components of the incident light. Note that the reflective polarizing film 3 may be one that transmits the S-polarized light component and reflects the P-polarized light component.
  • a polarizing plate 4 as a third optical member is arranged between the beam splitter 2 and the viewing position of the viewer US1.
  • the polarizing plate 4 has an optical characteristic of reflecting or absorbing the S-polarized component reflected by the reflective polarizing film 3 among the polarized components of the incident light, and transmitting the P-polarized component toward the viewer US1.
  • the reflective polarizing film 3 has an optical property of transmitting the S-polarized light component and reflecting the P-polarized light component
  • a polarizing plate 4 that reflects or absorbs the P-polarized light component and transmits the S-polarized light component is used. .
  • FIG. 2 is a diagram showing the operation of the beam splitter 2 and the reflective polarizing film 3.
  • the beam splitter 2 After the other part of the optical image L(S+P) passes through the beam splitter 2, it is filtered by the reflective polarizing film 3, which is placed in close contact with the second surface on the back side of the beam splitter. Only the S-polarized light component L2(s) is reflected and enters the polarizing plate 4.
  • the optical characteristics of the polarizing plate 4 are set to transmit the P-polarized light component and reflect or absorb the S-polarized light component. Therefore, the P polarized light component L3(P) of the optical image L1(S+P) reflected by the first surface (front) of the beam splitter 2 is transmitted through the polarizing plate 4 and presented to the viewer US1. .
  • the S-polarized light component L2(S) reflected by the reflective polarizing film 3 on the second surface (back surface) side of the beam splitter 2 is reflected or absorbed by the polarizing plate 4 and is not emitted to the viewer US1. . Therefore, the viewer US1 can visually recognize the aerial image MI of only the P-polarized light component L3(P) of the optical image L1(S+P), that is, the aerial image in which double images are suppressed.
  • the optical image L(S+P) displayed on the display D1 is formed on the first surface on the front side and the second surface on the back side of the beam splitter 2.
  • the S-polarized light component L2(S) is reflected by the reflective polarizing film 3, so it does not pass through the polarizing plate 4, and the viewer US1 sees the front side of the beam splitter 2. Only the P-polarized light component L3(P) included in the optical image L1(S+P) reflected by the first surface is presented.
  • the viewer US1 sees an aerial image MI consisting only of the P-polarized light component L3(P) of the optical image L1(S+P) and in which double images are suppressed. It becomes possible to visually recognize the image.
  • the optical image L emitted from the display is split between the first surface on the front side and the second surface on the back side of the beam splitter 2. are reflected as L1 and L2, respectively, and presented to the viewer as they are. For this reason, each of the reflected images L1 and L2 becomes a double image that is visually recognized by the viewer, and the quality of the aerial image inevitably deteriorates.
  • FIG. 3 shows a modification of the aerial image display device according to the first embodiment.
  • a specular reflective surface 5 is formed on the first surface of the beam splitter 2 on the front side using a technique such as metal vapor deposition.
  • the reflectance of the optical image L1(S+P) by the first surface of the beam splitter 2 can be increased, thereby increasing the brightness of the optical image L3(P) seen by the viewer US1. It becomes possible to further improve the display quality of the aerial image MI.
  • a retardation plate or a polarizing plate is arranged on the display surface of the display D1, so that the optical image L(S+P) emitted from the display D1 becomes an optical image L(P) having only the P polarization component. It may be configured as follows. With this configuration, the optical image L(P) of the P-polarized component is not reflected by the reflective polarizing film 3 disposed on the back side of the beam splitter 2, but is transmitted. Therefore, the occurrence of double images in the aerial image MI is suppressed.
  • the reflective polarizing film 3 may be arranged in close contact with the first surface of the beam splitter 2 on the front side facing the viewer US1.
  • the optical image L(S+P) emitted from the display D1 includes an S-polarized light component L(S) reflected at the front of the reflective polarizing film 3, and a beam splitter after passing through the reflective polarizing film 3. It is divided into a P-polarized light component L(P) which is reflected at 2. Of these reflected lights, only the P-polarized light component L(P) passes through the polarizing plate 4 and is visually recognized by the viewer US1. Therefore, with this configuration as well, it is possible to display a high quality aerial image MI in which the occurrence of double images is suppressed.
  • a second embodiment of the present invention provides a first optical image displayed by the first display and a second optical image displayed by the second display, as described in the first embodiment.
  • the viewer can view the first and second optical images in the air from two different directions. Each image can be viewed individually.
  • FIG. 4 is a diagram showing a second embodiment of the aerial image display device according to the present invention.
  • the same parts as in FIG. 1 are given the same reference numerals and detailed explanations will be omitted.
  • the second display D2 As shown in FIG. 4, at a position opposite to the first display D1 with the beam splitter 2 and the reflective polarizing film 3 in between, there is a mirror that faces the reflective polarizing film 3 at an inclination angle of about 45 degrees. In this state, the second display D2 is placed.
  • the second display D2 like the first display D1, is made of, for example, a liquid crystal panel, an organic EL panel, or an LED panel, and displays second display information.
  • a second polarizing plate 6 as a fourth optical member is disposed between the reflective polarizing film 3 and the viewing position of the second viewer US2 in a state perpendicular to the viewing direction of the viewer US2. It is located.
  • the second polarizing plate 6 has an optical characteristic of transmitting the S-polarized light component among the polarized light components of the incident light and reflecting or absorbing the P-polarized light component.
  • the aerial image corresponding to the first optical image L11(S+P) displayed on the display D1 is displayed as a double image. It becomes possible to present in a suppressed state.
  • the second optical image L21(S+P) displayed by the second display D2 includes the S-polarized light component L22(S) reflected by the front surface of the reflective polarizing film 3 and the S-polarized light component L22(S) that is transmitted through the reflective polarizing film 3. It is then separated into a P-polarized light component L23(P) which is reflected by the beam splitter 2. Of these, the S-polarized component L22(S) passes through the second polarizing plate 6 as it is and is presented to the second viewer US2.
  • the P polarized light component L23(P) is reflected or absorbed by the second polarizing plate 6 and is not presented to the second viewer US2. Therefore, it is possible to present to the viewer US2 an aerial image corresponding to the second optical image L21(S+P) with double images suppressed.
  • the third embodiment of the present invention provides a multilayer display of two different aerial images by adding a retroreflector and a retardation plate while sharing a set of beam splitter 2 and reflective polarizing film 3. It is what makes it possible.
  • FIG. 5 is a diagram showing the configuration of an aerial image display device according to a third embodiment of the present invention.
  • the same parts as those in FIG. 1 are given the same reference numerals and detailed explanations will be omitted.
  • the second display D2 As shown in FIG. 5, at a position opposite to the first display D1 with the beam splitter 2 and the reflective polarizing film 3 in between, there is a display that faces the reflective polarizing film 3 at an inclination angle of about 45 degrees. In this state, the second display D2 is placed.
  • the second display D2 like the first display D1, is made of, for example, a liquid crystal panel, an organic EL panel, or an LED panel, and displays second display information.
  • the retardation plate 7 is arranged in such a state that Furthermore, a retroreflector plate 8 is arranged on the back side of the retardation plate 7.
  • the retardation plate 7 converts the incident light into circularly polarized light when it passes through it.
  • the retroreflector 8 reverses the direction of rotation of the circularly polarized light when it retroreflects the circularly polarized light that has passed through the retardation plate 7 .
  • the second optical image L21(S+P) displayed on the second display D2 has an S polarized component L22(S) transmitted by the reflective polarizing film 3 to the retardation plate 7 and retroreflection. It is reflected in the direction of the plate 8.
  • the S-polarized light component L22(S) is first converted into circularly polarized light when it passes through the retardation plate 7, is retroreflected at the retroreflection plate 8, and then passes through the retardation plate 7 again to become a polarized light.
  • the direction is rotated by 90 degrees and converted into a P polarized light component L23(P).
  • the P-polarized light component L23(P) then passes through the reflective polarizing film 3 and the beam splitter 2, and further passes through the polarizing plate 4, and is presented to the viewer US1 as an aerial image.
  • the optical image L11(S+P) displayed on the first display D1 is partially reflected by the first surface on the front side of the beam splitter 2, as in the first embodiment.
  • only the P-polarized light component L13(P) is transmitted by the polarizing plate 4 and presented to the viewer US1.
  • the other part of the first optical image L11(S+P) is reflected by the second surface on the back side after passing through the beam splitter 2; Since the polarizing film 3 is closely arranged, only the S-polarized light component L12(S) is reflected, and this S-polarized light component L12(S) is reflected or absorbed by the polarizing plate 4 and is not presented to the viewer US1. Therefore, an aerial image corresponding to the first optical image L11(S+P) displayed on the display D1 is presented to the first viewer US1 in a state in which double images are suppressed. becomes possible.
  • the optical image displayed on the first display D1 is displayed on the background of the aerial image corresponding to the second optical image L21(S+P) displayed on the second display D2. It becomes possible to display an aerial image (virtual image) based on the optical image L11(S+P) of No. 1. That is, it becomes possible to display two aerial images in multiple layers.
  • This multilayered display makes it possible to display, for example, an image of a person or an object and its shadow, thereby realizing a realistic aerial image display.
  • the present invention is not limited to the above-described embodiments as they are, but can be embodied by modifying the constituent elements at the implementation stage without departing from the spirit of the invention.
  • various inventions can be formed by appropriately combining the plurality of components disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiments. Furthermore, components from different embodiments may be combined as appropriate.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
PCT/JP2022/031406 2022-08-19 2022-08-19 空中像表示装置および表示方法 Ceased WO2024038589A1 (ja)

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PCT/JP2022/031406 WO2024038589A1 (ja) 2022-08-19 2022-08-19 空中像表示装置および表示方法
JP2024541382A JP7740562B2 (ja) 2022-08-19 2022-08-19 空中像表示装置および表示方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2026034067A1 (ja) * 2024-08-08 2026-02-12 マクセル株式会社 空中浮遊映像表示装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0990312A (ja) * 1995-09-27 1997-04-04 Olympus Optical Co Ltd 光学装置
JPH09508477A (ja) * 1994-02-07 1997-08-26 バーチュアル・アイ／オゥ・インコーポレイテッド 増倍ビジュアルディスプレイ
JP2009128658A (ja) * 2007-11-26 2009-06-11 Toshiba Corp ヘッドアップディスプレイ用光学フィルム、ヘッドアップディスプレイ及び移動体
WO2018169018A1 (ja) * 2017-03-17 2018-09-20 富士フイルム株式会社 画像表示システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09508477A (ja) * 1994-02-07 1997-08-26 バーチュアル・アイ／オゥ・インコーポレイテッド 増倍ビジュアルディスプレイ
JPH0990312A (ja) * 1995-09-27 1997-04-04 Olympus Optical Co Ltd 光学装置
JP2009128658A (ja) * 2007-11-26 2009-06-11 Toshiba Corp ヘッドアップディスプレイ用光学フィルム、ヘッドアップディスプレイ及び移動体
WO2018169018A1 (ja) * 2017-03-17 2018-09-20 富士フイルム株式会社 画像表示システム

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2026034067A1 (ja) * 2024-08-08 2026-02-12 マクセル株式会社 空中浮遊映像表示装置

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JP7740562B2 (ja) 2025-09-17

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