WO2021240687A1 - Dispositif et procédé d'affichage - Google Patents

Dispositif et procédé d'affichage Download PDF

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Publication number
WO2021240687A1
WO2021240687A1 PCT/JP2020/020930 JP2020020930W WO2021240687A1 WO 2021240687 A1 WO2021240687 A1 WO 2021240687A1 JP 2020020930 W JP2020020930 W JP 2020020930W WO 2021240687 A1 WO2021240687 A1 WO 2021240687A1
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WO
WIPO (PCT)
Prior art keywords
screen
projector
image
display
projectors
Prior art date
Application number
PCT/JP2020/020930
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English (en)
Japanese (ja)
Inventor
隆 佐藤
誉宗 巻口
正典 横山
英明 高田
Original Assignee
日本電信電話株式会社
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 日本電信電話株式会社 filed Critical 日本電信電話株式会社
Priority to PCT/JP2020/020930 priority Critical patent/WO2021240687A1/fr
Publication of WO2021240687A1 publication Critical patent/WO2021240687A1/fr

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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
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type

Definitions

  • the present invention relates to a display device and a display method.
  • Patent Document 1 and Non-Patent Document 1 propose a display system capable of experiencing a 360-degree stereoscopic image without the need for 3D glasses.
  • Patent Document 1 includes a screen provided with a reflective Fresnel lens and a diffusion film, and a plurality of display devices arranged on a virtual circle above the screen. The images projected on the screen by the three adjacent display devices are reflected by the screen, and a spatially imaged iris surface is formed at the focal position of the reflected Fresnel lens. Adjacent spatially imaged iris planes, partially overlapped in the horizontal direction, allow the user to view a naked-eye 3D image due to the linear blending effect.
  • Non-Patent Document 1 a mirror provided with a holographic diffuser that limits the reflection direction is rotated at high speed, a parallax image is projected from an upper projector in a time-division manner in synchronization with the rotation, and the parallax image is displayed in each direction. do. This makes it possible to display a stereoscopic image as if there is an object in the center.
  • Patent Document 1 cannot produce a binocular parallax angle narrower than the projector spacing, so there is a limit to the depth that can be expressed.
  • the present invention has been made in view of the above, and an object thereof is to display a parallax image larger than the number of projectors.
  • the display device of one aspect of the present invention includes a reflective frenell lens and a diffusion film, and supports a screen that reflects a projected image to form a spatially imaged iris surface and the display surface of the screen upward.
  • Transducer control that periodically vibrates three or more projectors, a plurality of projectors that project an image onto the display surface of the screen, and the oscillator to periodically move the tilt of the screen in the rotational direction.
  • a unit and a projector control unit that supplies an image corresponding to the position of the spatially imaged iris surface formed by the projected image to the projector in a time-divided manner are provided.
  • the display method of one aspect of the present invention includes a reflective frenell lens and a diffusion film, and supports a screen that reflects a projected image to form a spatially imaged iris surface and the display surface of the screen upward. It is a display method of a display device including three or more oscillators and a plurality of projectors that project images onto the display surface of the screen, and the oscillator is periodically vibrated to tilt the screen. The image corresponding to the position of the spatially imaged iris surface formed by the projected image is supplied to the projector in a time division by periodically moving in the rotation direction.
  • FIG. 1 is a diagram for explaining an outline of the display system of the present embodiment.
  • FIG. 2 is a diagram showing an example of arrangement of oscillators.
  • FIG. 3 is a diagram showing an example in which the phases of the oscillators are shifted.
  • FIG. 4 is a diagram showing the periodic motion of the screen.
  • FIG. 5 is a diagram showing an example of the configuration of the oscillator.
  • FIG. 6 is a diagram for explaining the change in the position of the projection surface due to the periodic motion of the screen.
  • FIG. 7 is a side view of a projector and a screen as viewed from the side.
  • FIG. 8 is a top view of a projector and a screen as viewed from above.
  • FIG. 9 is a functional block diagram showing an example of the configuration of the control device.
  • FIG. 10 is a diagram for explaining an image supplied to the projector according to the tilt angle of the screen.
  • FIG. 11 is a flowchart showing the operation of the control device.
  • the display system of this embodiment is a system that projects an image from the projector 20 onto the screen 30 and displays a 3D image (stereoscopic image).
  • a 3D image is displayed by using an optical linear blending technique that utilizes a visual effect generated when adjacent spatially imaged iris planes overlap each other.
  • the plurality of projectors 20 are arranged in a circle above the screen 30 so as to surround the screen 30.
  • 60 projectors 20 are evenly arranged at intervals of 6 degrees on a virtual circle parallel to the ground with a position vertically separated from the center of the screen 30 as the center.
  • the number of projectors 20 is not limited to this.
  • Each of the projectors 20 projects an image of the subject taken from each of the entire circumferences of 360 degrees on the screen 30. The user 100 can see the image projected by the projector 20 arranged above the facing surface of the screen 30.
  • the screen 30 is a circular reflective screen provided with a reflective Fresnel lens and a diffusion film.
  • the screen 30 reflects the image output by the projector 20 and forms a spatially imaged iris surface at a position corresponding to the projection distance from the projector 20 to the screen 30 and the focal length of the screen 30.
  • the screen described in Patent Document 1 can be used.
  • the user 100 can see a clear image.
  • the center of the spatially imaged iris surface has the maximum brightness, and the brightness gradually decreases as the distance from the center in the horizontal direction increases.
  • the ratio of the brightness of the mixed images changes according to the viewpoint position, and the position where the object is perceived in the image changes according to the ratio of the brightness.
  • the images observed by the left and right eyes of the user 100 are images mixed at different luminance ratios, and each of the left and right eyes perceives an object in the image at a different position. As a result, the user 100 can see the 3D image.
  • the screen 30 is arranged on the vibrators 40A to 40D with the reflective surface facing upward.
  • four oscillators 40A to 40D are attached to the lower surface of the outer periphery of the screen 30.
  • FIG. 3 when each of the vibrators 40A to 40D is driven with a sinusoidal amplitude shifted by 90 degrees in phase, the entire screen 30 rotates while maintaining a predetermined tilt angle as shown in FIG. It is possible to give a periodic motion as if it were.
  • the tilt angle of the screen 30 can be arbitrarily set by adjusting the amplitudes of the vibrators 40A to 40D.
  • Non-Patent Document 1 requires that the reflector is rotated at high speed, and if the reflector is made large, the kinetic energy becomes large, which is dangerous.
  • the tilting direction of the screen 30 is changed without rotating the screen 30 itself, it is easy to increase the size of the screen 30.
  • the number of oscillators 40A to 40D is not limited to four, and if the number is three or more, the screen 30 can be periodically moved.
  • FIG. 5 shows an example of the configuration of the oscillator 40.
  • the iron core 41 is inserted in the electromagnetic coil 42, and the spring 43 is attached to one of the iron cores 41.
  • the vertical position of the iron core 41 is determined at a position that balances with the repulsive force of the spring 43 according to the strength of the electromagnetic field generated by the current flowing through the electromagnetic coil 42.
  • the oscillator 40 is not limited to this, and a solenoid or a low frequency speaker that combines an electromagnet and a permanent magnet can be used.
  • the control device 10 supplies images having different parallax in time division to the projector 20 in synchronization with the periodic motion of the screen 30.
  • Each of the images having different parallax is projected at a position corresponding to the tilt angle of the reflecting surface of the screen 30. That is, it is possible to output a plurality of images having different parallax by time division from one projector 20. As a result, more parallax images can be displayed than the number of projectors 20.
  • FIG. 7 shows a side view of a projector 20 and a screen 30 as viewed from the side
  • FIG. 8 shows a top view.
  • the eyes of the user 100 are located near the projection surface 50 on the left side of the screen 30.
  • the direction in which the screen 30 is viewed from the user 100 is defined as the X axis
  • the left-right direction of the user 100 is defined as the Y axis
  • the overhead direction of the user 100 is defined as the Z axis.
  • the normal vector N of the screen 30 can be expressed by the following equation using the maximum inclination a of the screen 30 and the angle b in the maximum inclination direction seen from the upper surface.
  • N (-sin (a) cos (b), -sin (a) sin (b), cos (a))
  • the angle b changes according to the periodic motion of the screen 30. In FIG. 8, it is assumed that the upper right direction (the direction of the broken line) is lifted on the screen 30.
  • the incident light L can be expressed by the following equation.
  • the specularly reflected light R by the screen 30 is given by the following equation.
  • the specular reflected light R forms an elliptical locus on the projection surface 50 due to the periodic motion of the screen 30.
  • the Y component of the specularly reflected light R can be expressed by the following equation.
  • this maximum value is 1 ⁇ 2 or more of the parallax angle due to the distance between the projectors 20, the images can be interpolated between the projectors 20 by the periodic motion of the screen 30.
  • the control device 10 shown in the figure includes an oscillator control unit 11, a projector control unit 12, and a synchronous coordination unit 13.
  • Each part included in the control device 10 may be configured by a computer provided with an arithmetic processing unit, a storage device, and the like, and the processing of each part may be executed by a program.
  • This program is stored in a storage device included in the control device 10, and can be recorded on a recording medium such as a magnetic disk, an optical disk, or a semiconductor memory, or can be provided through a network.
  • the oscillator control unit 11 drives each of the oscillators 40 in a phase-shifted sine and cosine shape.
  • the screen 30 is controlled as if the entire screen is rotated at regular intervals by changing the tilting direction while maintaining the angle formed by the horizontal plane and the display surface.
  • the oscillator control unit 11 inputs the inclination of the screen 30, for example, the normal direction of the screen 30 to the synchronous coordination unit 13.
  • the synchronous cooperation unit 13 obtains the angle information that the image projected by the projector 20 reflects on the screen 30 from the tilt of the screen 30, and inputs the angle information to the projector control unit 12.
  • the synchronous coordination unit 13 inputs the angle information to the projector control unit 12 after correcting the delay related to the control. As a result, synchronization between the oscillator control unit 11 and the projector control unit 12 can be achieved.
  • the projector control unit 12 obtains the position where the image projected by the projector 20 is reflected on the screen 30 and is projected from the angle information of the screen 30, and synthesizes and displays the image seen from the obtained position. Let me.
  • the control device 10 When the screen 30 is parallel to the horizontal plane, the image projected by the projector 20 is reflected on the screen 30 and projected on the front viewpoint V1 as shown in FIG.
  • the control device 10 generates an image of the subject viewed from the viewpoint V1 and supplies it to the projector 20.
  • the positional relationship between the subject object arranged in the virtual space and the virtual camera is made to correspond to the positional relationship between the screen 30 and the viewpoint V1, and an image obtained by shooting the subject object with the virtual camera is generated.
  • the image supplied to the projector 20 is subjected to keystone correction and lens distortion correction so as to correct distortion due to the positional relationship between the projector 20 and the screen 30.
  • the image projected by the projector 20 is reflected on the screen 30 and projected on the viewpoint V2 according to the tilt direction of the screen 30.
  • the control device 10 generates an image of the subject viewed from the viewpoint V2 and supplies it to the projector 20.
  • a plurality of viewpoints V2 may be provided discretely at regular intervals.
  • the projection of the projector 20 may be suppressed to reduce the blurring due to the afterimage.
  • an image is projected at the timing when the projection center comes to the viewpoint V2, with the viewpoint V2 as the viewpoint at the timing when the Y component of the specular reflected light R described with reference to FIGS. 7 and 8 takes a maximum value. do.
  • step S11 the vibrator control unit 11 controls the vibrators 40A to 40D to periodically move the screen 30.
  • the control device 10 executes the following steps S12 to S14 for each of the projectors 20.
  • step S12 the synchronization cooperation unit 13 inputs the angle information that the image projected by the projector 20 is reflected on the screen 30 to the projector control unit 12.
  • step S13 the projector control unit 12 synthesizes an image that can be seen from the viewpoint at the position where the image projected by the projector 20 is reflected on the screen 30.
  • step S14 the projector control unit 12 supplies the image synthesized in step S13 to the projector 20, and projects the image from the projector 20.
  • steps S13 and S14 may be executed for the projector 20 whose projection center comes to the viewpoint V2 for projecting the image from the projector 20.
  • the display system of the present embodiment includes a screen 30 provided with a reflective Fresnel lens and a diffusion film, and reflects a projected image to form a spatially imaged iris surface, and the display surface of the screen 30 is moved upward. It has three or more transducers 40A to 40D that support toward the screen, a plurality of projectors 20 that project images onto the display surface of the screen 30, and a control device 10.
  • the control device 10 periodically vibrates the projectors 40A to 40D to periodically move the tilt of the screen 30 in the rotational direction, and hourly produces an image corresponding to the position of the spatially imaged iris surface formed by the projected image. It is supplied to the projector 20 in division. This makes it possible to display more parallax images than the number of projectors 20.
  • the optical axis of the reflective Frenel lens of the screen 30 (the vertical line passing through the center of the screen 30) and the position of the projector 20 are separated from each other to collect light.
  • the display system of the present embodiment tilts the screen 30 as shown in FIG. 7, so that the projector 20 can be brought closer to the optical axis by the amount of the tilt of the screen 30, and the light collection accuracy is reduced. Can be improved. Further, since the projector 20 can be brought closer to the optical axis, the problem that the image projected by the projector 20 is hidden by the facing user can be alleviated.
  • Control device 11 Oscillator control unit 12 . Projector control unit 13 ... Synchronous coordination unit 20 . Projector 30 ... Screen 40, 40A-40D ... Oscillator 41 ... Iron core 42 . Electromagnetic coil 43 ... Spring 50 ... Projection surface 100 ... A user

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

Un système d'affichage selon le présent mode de réalisation comprend : un écran 30 qui est pourvu d'une lentille de Fresnel réfléchissante et d'un film de diffusion, et forme un plan d'iris d'imagerie spatiale par réflexion d'une vidéo projetée ; trois vibreurs 40A-40D ou plus qui supportent une surface d'affichage de l'écran 30 faisant face vers le haut ; une pluralité de projecteurs 20 qui projettent une vidéo sur la surface d'affichage de l'écran 30 ; et un dispositif de commande 10. Le dispositif de commande 10 amène les vibreurs 40A-40D à vibrer périodiquement, amène l'inclinaison de l'écran 30 à s'engager dans un mouvement périodique dans une direction de rotation, et fournit une vidéo correspondant à la position du plan d'iris d'imagerie spatiale formé par la vidéo projetée vers les projecteurs 20 dans la répartition dans le temps.
PCT/JP2020/020930 2020-05-27 2020-05-27 Dispositif et procédé d'affichage WO2021240687A1 (fr)

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PCT/JP2020/020930 WO2021240687A1 (fr) 2020-05-27 2020-05-27 Dispositif et procédé d'affichage

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03206794A (ja) * 1989-09-19 1991-09-10 Texas Instr Inc <Ti> リアルタイム３次元ディスプレイ装置
CN104298065A (zh) * 2014-05-07 2015-01-21 浙江大学 基于多台高速投影机拼接的360°三维显示装置和方法
JP2015232633A (ja) * 2014-06-10 2015-12-24 セイコーエプソン株式会社 表示装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03206794A (ja) * 1989-09-19 1991-09-10 Texas Instr Inc <Ti> リアルタイム３次元ディスプレイ装置
CN104298065A (zh) * 2014-05-07 2015-01-21 浙江大学 基于多台高速投影机拼接的360°三维显示装置和方法
JP2015232633A (ja) * 2014-06-10 2015-12-24 セイコーエプソン株式会社 表示装置

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