WO2017077965A1 - Dispositif d'affichage d'image - Google Patents

Dispositif d'affichage d'image Download PDF

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Publication number
WO2017077965A1
WO2017077965A1 PCT/JP2016/082207 JP2016082207W WO2017077965A1 WO 2017077965 A1 WO2017077965 A1 WO 2017077965A1 JP 2016082207 W JP2016082207 W JP 2016082207W WO 2017077965 A1 WO2017077965 A1 WO 2017077965A1
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WO
WIPO (PCT)
Prior art keywords
image
light
holographic optical
display
optical
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PCT/JP2016/082207
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English (en)
Japanese (ja)
Inventor
寛子 大森
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コニカミノルタ株式会社
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Publication of WO2017077965A1 publication Critical patent/WO2017077965A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/02—Catoptric systems, e.g. image erecting and reversing system
    • G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
    • 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
    • G02B27/02—Viewing or reading apparatus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers

Definitions

  • the present invention relates to a video display device.
  • a display image of a liquid crystal display (LCD) is magnified by a holographic optical element (HOE) and observed as a virtual image with a wide viewing angle.
  • HOE holographic optical element
  • the present invention relates to a video display device.
  • glasses-type video display devices that display images on the outside field of view (outside scene) in a see-through manner are generally used hands-free, it is important to display information in an optimal situation for the user. On the other hand, it is necessary to respond to a demand for not only a display image but also a good view of the external field of view.
  • the size of the display screen is particularly important, and it is preferable that the display screen is large so that the user can see the display screen even when the user shifts his / her line of sight to observe the outside world. In addition, it is preferable that the display screen can be continuously viewed even when the relative position between the observer's eye and the display element is shifted.
  • the range in which the user can see the display screen even when the position of the display element is shifted is called an eye box, and it is preferable to widen the eye box. Furthermore, the comfort of wearing is important, and for that purpose, it is necessary to reduce the weight and size of the video display device.
  • observation optical systems using a reflective surface have been proposed as observation optical systems for observing a virtual image of a display image.
  • many of them are mainly aimed at reducing the volume of the entire optical system, so a wide viewing angle (the viewing angle is the image when the image display surface in the observation optical system is considered as the image surface in the imaging optical system). It is not configured to obtain a corner.).
  • a wide viewing angle the viewing angle is the image when the image display surface in the observation optical system is considered as the image surface in the imaging optical system. It is not configured to obtain a corner.
  • Patent Document 1 proposes an image display device that widens the viewing angle by arranging two holographic optical elements in a direction perpendicular to the optical axis of the observer's eye.
  • two holographic optical elements share a space with at least a part of an optical path by utilizing the wavelength selectivity of the holographic optical element.
  • the two holographic optical elements have sharp reflection peaks at different wavelengths with different reflection characteristics, so they do not affect each other's optical characteristics, but display images of almost the same color are observed in the observer's eyes. Is done.
  • the screen colors of the display elements are not completely the same. Therefore, even if an attempt is made to combine the two holographic optical elements with different reflection characteristics that look almost the same color, the types of light sources that can be used are limited, so that the manufacture is difficult. For example, since there are few kinds of laser light sources, it is difficult to obtain what is necessary for a desired combination of reflection characteristics.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide an image display device that is easy to manufacture, is lightweight and small, and can display an image with a wide viewing angle.
  • a video display device of the present invention includes a display unit that displays an image, an illumination unit that illuminates the display image with a plurality of optical paths, and an image obtained with respect to the plurality of optical paths by the illumination.
  • An image display device having an observation optical system for guiding light to an observer's eye, The observation optical system diffracts and reflects the image light to form the display image as a plurality of virtual images, and guides the image light to the plurality of holographic optical elements.
  • a prism to The plurality of holographic optical elements are arranged to be inclined in the same direction at intervals, and light transmitted through any one of the holographic optical elements is diffracted and reflected by at least one other holographic optical element.
  • an image display device capable of displaying an image with a wide viewing angle while being easy to manufacture, lightweight and small.
  • FIG. 1 is a schematic sectional view schematically showing a first embodiment of a video display device.
  • the schematic sectional drawing which shows 2nd Embodiment of an image display apparatus typically.
  • the schematic sectional drawing which shows typically 3rd Embodiment of a video display apparatus.
  • the graph which shows the angle dependence of the diffraction efficiency of a holographic optical element.
  • the graph which shows the reflectance and transmittance
  • the schematic sectional drawing which shows the relationship between a holographic optical element and an optical path.
  • the optical path figure which shows the overlap of the pupil when two optical paths are formed.
  • the graph which shows the time division drive of an illumination part.
  • the schematic sectional drawing which shows the structural example of an illumination part (2 light source type) and a display part.
  • the schematic perspective view which shows the structural example of an illumination part (1 light source type) and a display part.
  • the video display devices X1 to X3 include a display unit DP that displays the images IM1 and IM2 or the images im1 and im2, and illumination that performs illumination on the display images IM1 and IM2; im1 and im2 in the first optical path P1 and the second optical path P2. And an observation optical system KK for guiding the image light obtained from the first optical path P1 and the second optical path P2 by the illumination to the observer's eye EY.
  • the illumination unit IL of the video display device X1 includes two light emitting elements i1 and i2.
  • the illumination lights from the light emitting elements i1 and i2 are emitted at different angles to form the first optical path P1 and the second optical path P2, respectively.
  • the illumination unit IL of the video display devices X2 and X3 includes two light emitting elements i1 and i2 and a half mirror HM.
  • the illumination light from the light emitting element i1 passes through the half mirror HM to form the first optical path P1, and the illumination light from the light emitting element i2 is reflected by the half mirror HM to form the second optical path P2. And it inject
  • the first optical path P1 and the second optical path P2 are formed simultaneously, whereas in the illumination unit IL of the video display device X3, the first optical path P1 and the second optical path P2 are formed.
  • the light emission of the light emitting elements i1 and i2 is controlled by the control unit CL so as to be switched in a time division manner.
  • the same first and second optical paths P1 and P2 can be formed without using the half mirror HM.
  • the half mirror HM is used like the illumination unit IL of the video display devices X2 and X3
  • the first and second optical paths P1 and P2 can be easily changed without changing the arrangement of the light emitting elements i1 and i2. Is possible. Since the degree of freedom is high, the position adjustment of the first and second optical paths P1 and P2 is facilitated.
  • Examples of the light emitting elements i1 and i2 include a laser light source corresponding to each wavelength of R (red), G (green), and B (blue), and an LED (light emitting diode) light source. The use of an LED light source is assumed.
  • the display unit DP of the video display device X1 includes two display elements d1 and d2, and displays the images IM1 and IM2 on the first optical path P1 and the second optical path P2, respectively.
  • the display unit DP of the video display devices X2 and X3 is composed of one display element d0.
  • two areas for displaying the images IM1 and IM2 on the first optical path P1 and the second optical path P2 are set as one display screen.
  • the display of the display element d0 is controlled by the control unit CL so as to switch the display image itself to the image im1 and the image im2 in a time division on one display screen.
  • one display screen is formed by the image IM1 and the image IM2 displayed on the display unit DP.
  • the upper half of the display screen is formed by the image IM1
  • the lower half of the display screen is formed by the image IM2.
  • the images IM1 and IM2 are spatially separated and displayed, whereas in the case of the video display device X3, the images IM1 and IM2 are temporally separated and displayed.
  • the display elements d0, d1, and d2 include non-light emitting display elements such as a reflective or transmissive LCD (liquid crystal display) and a digital micromirror device.
  • a transmissive LCD or the like is used.
  • the observation optical system KK includes two holographic optical elements H1 and H2 and a prism PR in which they are arranged.
  • the prism PR guides the image light from the display unit DP to the holographic optical elements H1 and H2, and the holographic optical elements H1 and H2 diffract the reflection of the image light to generate two display images IM1 and IM2.
  • Each is formed as two virtual images. Therefore, the display images IM1 and IM2 are projected and displayed on the observer eye EY as see-through images as virtual images so as to overlap the external field of view.
  • the display image is colored in conjunction with the fact that the light emitting elements i1, i2 illuminate the display unit DP with light corresponding to each color of R, G, B, and the light emission of each color is sequentially switched in time,
  • the display unit DP displays the images IM1, IM2; im1, im2 corresponding to the colors R, G, B.
  • the two holographic optical elements H1 and H2 are tilted in the same direction at an interval, and are different from each other so that light transmitted through the holographic optical element H1 is diffracted and reflected by the holographic optical element H2. It has an angle dependency that selectively diffracts and reflects only light having a predetermined incident angle. Then, the virtual images obtained by enlarging the display images IM1 and IM2; im1 and im2 are formed as independent optical systems, and the viewing angles of the virtual images are widened by synthesizing the visual fields of the virtual images. It is the structure which makes it observe.
  • the holographic optical elements H1 and H2 have high wavelength selectivity, high angle selectivity, and high light transmittance (effective visual sensitivity transmittance is 80% or more) as a general feature, they are high. See-through performance can be secured. Then, by separating the holographic optical elements H1 and H2, the viewing angle can be widened by synthesizing the visual field of the virtual image and the display screen can be enlarged. At this time, the exit pupils of the holographic optical elements H1 and H2 It is also easy to stack. Further, by arranging the holographic optical elements H1 and H2 obliquely, it is possible to suppress the prism PR from becoming thick and to suppress the increase in size of the entire apparatus.
  • the prism PR as a light guide plate and bending the optical path by one to several reflections from the display unit DP to the holographic optical elements H1 and H2, the distance from the display unit DP to the holographic optical elements H1 and H2 is increased. Further, see-through display in which the outside world and the virtual image are simultaneously observed using the transparency of the prism PR itself is possible.
  • a transparent optical member such as a prism PR is used as an optical member for bending the optical path, it is possible to transmit other light beams except for a portion provided with a reflective coating or the like. This is advantageous when configuring a certain wearable display or the like. Further, if the optical path is bent using total reflection, a reflection coating or the like is unnecessary, and therefore it is possible to transmit other light beams to all surfaces.
  • FIG. 4 shows an example of the angular dependence on the diffraction efficiency of the holographic optical elements H1 and H2 with respect to the three wavelengths of RGB (the circle is the wavelength of 413.1 nm, the triangle is the wavelength of 532.0 nm, and the square is the wavelength of 647.1 nm. Respectively.)
  • the diffraction efficiency changes when the incident angle ⁇ (°) changes, it is possible to switch between diffraction and transmission by selecting the light incident angle ⁇ with respect to the holographic optical elements H1 and H2. It is.
  • the angle difference required for switching between diffraction and transmission depends on the wavelength width of the image light, but when the wavelength width is narrow (for example, when a laser light source is used), the wavelength width is about 10 degrees or less and the wavelength width is wide. For example (when an LED light source is used), it is about 10 to 20 degrees.
  • the incident angle ⁇ of light with respect to the holographic optical element H1 is ⁇ 1 and ⁇ 2 for the first optical path P1 and the second optical path P2, respectively, the reflectance R1 (solid line,% , Corresponding to diffraction efficiency) and transmittance T1 (broken line,%) are as shown in FIG. As can be seen from FIG.
  • the light of the first optical path P1 can be diffracted and reflected and the light of the second optical path P2 can be transmitted by the holographic optical element H1. Then, the light of the second optical path P2 transmitted through the holographic optical element H1 can be diffracted and reflected by the holographic optical element H2.
  • FIG. 6 shows the relationship between the holographic optical elements H1 and H2 and the first and second optical paths P1 and P2.
  • the holographic optical elements H1 and H2 are respectively arranged so as to make angles ⁇ 1 and ⁇ 2 with respect to the prism surface S1 (exit side plane).
  • RGB three-wavelength light set to the same wavelength combination in the first optical path P1 and the second optical path P2 enters the prism PR
  • the light in the first optical path P1 enters the holographic optical element H1 at an incident angle ⁇ 1.
  • the incident light is diffracted and reflected, and the light in the second optical path P2 enters the holographic optical element H1 at an incident angle ⁇ 2 and is transmitted therethrough.
  • the light in the second optical path P2 that has passed through the holographic optical element H1 enters the holographic optical element H2 at an incident angle ⁇ 3 and is diffracted and reflected.
  • ⁇ 1 31 °
  • ⁇ 2 40 °
  • ⁇ 1 26 °
  • ⁇ 2 36 °
  • ⁇ 3 27 °.
  • the first light path P1 in which the light emitting element i1 illuminates the display element d1 and the display element d1 generates the image light of the display image IM1 is a holo after total reflection on the prism surface S1 in the prism PR.
  • the graphic optical element H1 is bent toward the observer eye EY.
  • the second light path P2 in which the light emitting element i2 illuminates the display element d2 and the display element d2 generates the image light of the display image IM2 is a hollow surface after total reflection at the prism surface S2 and the prism surface S1 in the prism PR.
  • the light passes through the graphic optical element H1 and is bent by the holographic optical element H2 toward the observer eye EY.
  • the first light path P1 through which the light emitting element i1 illuminates the display element d0 and the display element d0 generates the image light of the display image IM1 and im1 is all in the prism PR on the prism surface S1. After reflection, it is bent toward the observer's eye EY by the holographic optical element H1.
  • the second light path P2 in which the light emitting element i2 illuminates the display element d0 and the display element d0 generates image light of the display images IM2 and im2 is totally reflected by the prism surface S1 in the prism PR, and then holographic optically. The light passes through the element H1 and is bent toward the observer eye EY by the holographic optical element H2.
  • a wide viewing angle is achieved by synthesizing the field of view by the combination of the first and second optical paths P1 and P2.
  • the holographic optical elements H1 and H2 are arranged to be inclined in the same direction, and the angle dependency of the holographic optical elements H1 and H2 with respect to the incident light is used to separate the first optical path P1 and the second optical path P2.
  • the volume occupied by the observation optical system KK is made compact. Therefore, the observation optical system KK enables virtual image observation with a wide viewing angle despite being thin in the optical axis direction of the observer eye EY.
  • the screen colors in the first and second optical paths P1 and P2 can be made completely the same (that is, the first optical path P1 and the first optical path P1). Since the wavelength does not affect the separation from the second optical path P2, the image display devices X1 to X3 are easy to manufacture, lightweight, and small, and can display images with a wide viewing angle.
  • the above effect is not limited to a combination of two optical paths P1 and P2 and two holographic optical elements H1 and H2, but is also a combination of three or more optical paths and three or more holographic optical elements. It is the same. That is, the same effect can be obtained even when a plurality of optical paths and a plurality of diffraction actions are combined.
  • the plurality of holographic optical elements have an angle dependency that selectively diffracts and reflects only light having a predetermined incident angle different from each other, and the light transmitted through any one of the holographic optical elements is the other. Diffracted and reflected by at least one holographic optical element. Then, a virtual image obtained by enlarging and projecting the display image is formed as an independent optical system, and the visual field is widened by synthesizing the visual field of each virtual image, and each virtual image is observed by the observer eye EY.
  • the optical performance can be improved because the degree of freedom of the observation optical system KK is improved.
  • a wide viewing angle is also possible.
  • the two display screens can be arranged so as to be shifted in parallel or non-parallel. This not only synthesizes the field of view so that the two display screens are observed in a continuous field of view, but also shifts the virtual image formation position back and forth or up and down, left and right, so that the two display screens have a discontinuous field of view. It is also possible to synthesize the field of view as observed.
  • the display element DP since different types of images (for example, video and subtitles) can be mixed in the display element d1 and the display element d2, it is possible to diversify the video expression as well as wide viewing angle. Further, when the image display is performed by one display element d0 like the display unit DP in the video display devices X2 and X3, the display unit DP can be reduced in size.
  • the holographic optical elements H1 and H2 are arranged so as to be inclined non-parallel to each other from a position having a parallel surface to a position where diffraction reflection is close to regular reflection. Is preferred. Diffraction efficiency can be improved by performing diffraction reflection at the holographic optical elements H1 and H2 at an angle close to regular reflection.
  • the flat holographic optical elements H1 and H2 are made parallel to each other, the diffraction efficiency is lowered when the light in the second optical path P2 is diffracted and reflected by the holographic optical element H2, but the flat holographic optical element By making H1 and H2 non-parallel to each other, it is possible to optimize the first and second optical paths P1 and P2 so that the pupil position is set appropriately, and to obtain high diffraction efficiency.
  • FIG. 7A shows a state in which the pupil EP partially overlaps with respect to the first and second optical paths P1 and P2.
  • FIG. 7B shows the pupil EP completely with respect to the first and second optical paths P1 and P2. Indicates the overlapped state.
  • the pupil EP formed by the diffracted and reflected light from the plurality of holographic optical elements H1 and H2 is formed so as to at least partially overlap, and more preferably formed so as to overlap completely.
  • the observation optical system KK of the video display device X3 is an optical system for observing a display image of a normal size displayed on one display element d0 so that the display angle of the virtual image becomes wide as viewed from the observer.
  • the holographic optical elements H1 and H2 are arranged.
  • the first optical path P1 bent toward the observer eye EY by the holographic optical element H1 and the second optical path P2 bent toward the observer eye EY by the holographic optical element H2 are switched in a time division manner. .
  • the switching is performed by control in which the control unit CL drives the illumination unit IL and the display unit DP in a time-sharing manner.
  • the time division driving of the illumination unit IL is performed by causing the two light emitting elements i1 and i2 to emit light alternately.
  • An example of the time-division driving of the illumination unit IL is shown in FIG. 8 by the change with time of the emission intensity of the light-emitting elements i1 and i2 (solid line: light-emitting element i1, broken line: light-emitting element i2).
  • the optical paths P1 and P2 of illumination by the illumination unit IL are switched in time division, so that the optical paths P1 and P2 formed by the holographic optical elements H1 and H2 are switched in time division. .
  • the display images im1 and im2 formed on the display unit DP are switched in a time division manner in conjunction with the switching of the illumination optical paths P1 and P2 by the illumination unit IL.
  • the first and second optical paths P1 and P2 by time-division driving of the illumination unit IL and the display unit DP, the number of parts of the illumination unit IL and the display unit DP is reduced, and the display unit is displayed with one display element d0.
  • the DP can be configured, and space can be saved.
  • the video light generated by the display unit DP is transmitted through the first and second optical paths P1 and P1, respectively. It is necessary to emit in different directions at P2, that is, to form the first and second optical paths P1 and P2 suitable for the observation optical system KK with the illumination part IL and the display part DP.
  • 9 and 10 show a configuration example of the illumination unit IL and the display unit DP that form the first and second optical paths P1 and P2.
  • 9A to 9C are configuration examples of a two-light source type in which the illumination unit IL includes two light-emitting elements i1 and i2, and FIG. 10 illustrates a one-light source type in which the illumination unit IL includes one light-emitting element i0. It is a structural example.
  • the configuration example of FIG. 9A corresponds to the illumination unit IL and the display unit DP mounted on the video display device X1, and the configuration example of FIG. 9B is mounted on the video display devices X2 and X3.
  • the illumination unit IL includes two light emitting elements i1 and i2 (white light source) and two color switching filters f1 and f2. Like 9 (B), it is composed of one display element d0. Therefore, the configuration example in FIG. 9C can be used for the video display devices X2 and X3.
  • the color switching filters f1 and f2 in FIG. 9C are composed of three types of color filters that transmit R, G, and B color light, and correspond to, for example, a color wheel.
  • White light from the light emitting elements i1 and i2 enters the color switching filters f1 and f2.
  • the display unit DP can be illuminated with light corresponding to each color. Therefore, in the configuration example of FIGS. 9A and 9B, illumination for colorizing the display image is performed as in the case of sequentially switching the R, G, and B light emission of the light emitting elements i1, i2. Can do.
  • the first optical path P1 and the second optical path P2 are formed by illumination light emitted from the color switching filters f1 and f2 at different angles, respectively.
  • the illumination unit IL shown in FIG. 10 includes one light emitting element i0 and one optical path switching device LS.
  • the light emitting element i0 include a laser light source, an LED light source, and the like corresponding to each wavelength of R, G, and B as in the case of the light emitting elements i1 and i2.
  • the optical path switching device LS performs illumination by switching the light emission direction between the first optical path P1 and the second optical path P2 by electro-optic deflection (time division driving).
  • the illumination unit IL is configured to perform illumination in a plurality of optical paths P1 and P2 by switching the light emission direction by electro-optic deflection, it is possible to reduce the number of components and save space. It becomes possible.
  • the holographic optical elements H1 and H2 superimpose the virtual images of the images IM1 and IM2; im1 and im2 on the external field of view, and project and display them on the observer eye EY in a see-through manner
  • An optical see-through display provided with can be configured.
  • the optical see-through display include HMD (head-mounted display), HUD (Head-Up Display), etc., but the video display devices X1 to X3 are suitable for eyeglass-type wearable displays because they are lightweight and small.

Abstract

L'invention concerne un dispositif d'affichage d'image qui comprend une unité d'affichage permettant d'afficher une image, une unité d'éclairage permettant un éclairage au moyen d'une pluralité de chemins de lumière, et un système optique d'observation permettant de guider une lumière d'image obtenue pour la pluralité de chemins de lumière vers l'œil d'un observateur. Le système optique d'observation comprend : une pluralité d'éléments optiques holographiques pour former les images d'affichage respectives en tant qu'une pluralité d'images virtuelles par diffraction et réflexion de la lumière d'image ; et un prisme pour guider la lumière d'image vers la pluralité d'éléments optiques holographiques. La pluralité d'éléments optiques holographiques est disposée pour qu'ils soient inclinés dans la même direction et présentent des espacements entre eux et une dépendance angulaire qui amène sélectivement la diffraction et la réflexion de la lumière incidente uniquement à des angles prescrits différents les uns des autres de telle sorte qu'une lumière traversant un élément optique holographique quelconque est diffractée et réfléchie par au moins un autre élément optique holographique. Conjointement avec la formation d'images virtuelles par projection et agrandissement des images d'affichage en tant que systèmes optiques mutuellement indépendants, les éléments optiques holographiques augmentent l'angle d'observation par combinaison d'un champ de vision pour chaque image virtuelle et chaque image virtuelle est observée par l'œil de l'observateur.
PCT/JP2016/082207 2015-11-04 2016-10-31 Dispositif d'affichage d'image WO2017077965A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113759551A (zh) * 2020-06-03 2021-12-07 日立乐金光科技株式会社 影像显示装置
JP7477155B2 (ja) 2020-06-22 2024-05-01 国立大学法人宇都宮大学 虚像生成装置

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Publication number Priority date Publication date Assignee Title
JPH0651239A (ja) * 1992-07-31 1994-02-25 Canon Inc 画像表示装置
JP2002040235A (ja) * 2000-05-19 2002-02-06 Sharp Corp 反射型カラー液晶表示素子およびカラー反射板
JP2002098928A (ja) * 2000-09-25 2002-04-05 Minolta Co Ltd 映像表示装置
JP2006091041A (ja) * 2004-09-21 2006-04-06 Konica Minolta Holdings Inc ホログラフィック反射面を有する広角観察光学系
JP2014503836A (ja) * 2010-11-08 2014-02-13 シーリアル テクノロジーズ ソシエテ アノニム 表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0651239A (ja) * 1992-07-31 1994-02-25 Canon Inc 画像表示装置
JP2002040235A (ja) * 2000-05-19 2002-02-06 Sharp Corp 反射型カラー液晶表示素子およびカラー反射板
JP2002098928A (ja) * 2000-09-25 2002-04-05 Minolta Co Ltd 映像表示装置
JP2006091041A (ja) * 2004-09-21 2006-04-06 Konica Minolta Holdings Inc ホログラフィック反射面を有する広角観察光学系
JP2014503836A (ja) * 2010-11-08 2014-02-13 シーリアル テクノロジーズ ソシエテ アノニム 表示装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113759551A (zh) * 2020-06-03 2021-12-07 日立乐金光科技株式会社 影像显示装置
JP7477155B2 (ja) 2020-06-22 2024-05-01 国立大学法人宇都宮大学 虚像生成装置

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