US20190377193A1 - Display method and display device - Google Patents

Display method and display device Download PDF

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Publication number
US20190377193A1
US20190377193A1 US16/341,589 US201716341589A US2019377193A1 US 20190377193 A1 US20190377193 A1 US 20190377193A1 US 201716341589 A US201716341589 A US 201716341589A US 2019377193 A1 US2019377193 A1 US 2019377193A1
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United States
Prior art keywords
stereoscopic image
image
display device
display
optical element
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Abandoned
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US16/341,589
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English (en)
Inventor
Masayuki Shinohara
Yasuhiro Tanoue
Norikazu Kitamura
Mitsuru Okuda
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Omron Corp
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Omron Corp
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Assigned to OMRON CORPORATION reassignment OMRON CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KITAMURA, NORIKAZU, OKUDA, MITSURU, SHINOHARA, MASAYUKI, TANOUE, YASUHIRO
Publication of US20190377193A1 publication Critical patent/US20190377193A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • G02B27/2214—
    • G02B27/2235—
    • 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
    • G02B30/26—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 autostereoscopic type
    • G02B30/27—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 autostereoscopic type involving lenticular arrays
    • 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
    • G02B30/26—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 autostereoscopic type
    • G02B30/33—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 autostereoscopic type involving directional light or back-light sources
    • 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
    • G02B30/34—Stereoscopes providing a stereoscopic pair of separated images corresponding to parallactically displaced views of the same object, e.g. 3D slide viewers
    • G02B30/35—Stereoscopes providing a stereoscopic pair of separated images corresponding to parallactically displaced views of the same object, e.g. 3D slide viewers using reflective optical elements in the optical path between the images and the observer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/006—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to produce indicia, symbols, texts or the like
    • 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
    • G03B35/00—Stereoscopic photography
    • G03B35/18—Stereoscopic photography by simultaneous viewing
    • G03B35/24—Stereoscopic photography by simultaneous viewing using apertured or refractive resolving means on screens or between screen and eye

Definitions

  • the present invention relates to a display method and a display device for causing an observer to recognize a stereoscopic image.
  • Patent Document 1 Conventionally, as a display device for displaying a stereoscopic image, for example, an image display device disclosed in Patent Document 1 has been known.
  • the image display device disclosed in Patent Document 1 includes: a light guide plate; a light source provided at the end of the light guide plate; a first display pattern having a plurality of first prisms formed on the rear surface of the light guide plate; and a second display pattern having a plurality of second prisms formed on the rear surface of the light guide plate.
  • the first display pattern forms a first image on the front surface side of the light guide plate with the plurality of first prisms
  • the second display pattern forms a second image on the front surface side of the light guide plate with the plurality of second prisms.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2012-118378
  • Patent Document 2 Japanese Unexamined Patent Publication No. 2011-175297
  • the light guide plate as an optical element is transparent, and a stereoscopic image is displayed on a plane parallel to the outgoing surface of the light guide plate. Therefore, the observer feels that the light emitting surface of the light guide plate is shining. As a result, there is a problem in which the observer hardly feels the stereoscopic effect of the stereoscopic image.
  • An object of one aspect of the present invention is to realize a display method for a stereoscopic image which enables an observer to visually recognize a stereoscopic image having a stereoscopic effect when the optical element is transparent.
  • a display method is a display method for a stereoscopic image, using a display device provided with a transparent optical element, the display method including: emitting light to be recognized by an observer as a stereoscopic image from the optical element; and displaying at least a part of the stereoscopic image on a plane not parallel to an outgoing surface of the optical element.
  • the observer is able to visually recognize a rear surface side of the display device through the optical element.
  • a display method is a display method for a stereoscopic image, using a display device provided with a transparent optical element, the display method including emitting light to be recognized by an observer as a stereoscopic image from the optical element.
  • the observer is able to visually recognize a rear surface side of the display device through the optical element, and the stereoscopic image has two planes positioned on mutually different planes.
  • a display method is a display method for a stereoscopic image, using a display device provided with a transparent optical element, the display method including emitting light to be recognized by an observer as a stereoscopic image from the optical element.
  • the observer is able to visually recognize a rear surface side of the display device through the optical element, and the stereoscopic image includes two line segments that are parallel to one plane and are not parallel to each other and one line segment that is not parallel to the plane.
  • the optical element when the optical element is transparent, an effect is exerted to enable an observer to visually recognize a stereoscopic image having a stereoscopic effect.
  • FIG. 1 is a perspective view illustrating a configuration of a display device according to a first embodiment of the present invention.
  • FIG. 2 is a sectional view illustrating the configuration of the display device.
  • FIG. 3 is a plan view illustrating the configuration of the display device.
  • FIG. 4( a ) is a plan view illustrating a configuration of an optical path changing unit provided in the display device
  • FIG. 4( b ) is a perspective view illustrating a configuration of a reflector provided for changing the optical path.
  • FIG. 5 is a perspective view illustrating arrangement of reflectors in the optical path changing unit.
  • FIG. 6 is a perspective view illustrating a method for forming a plane image by the optical path changing unit.
  • FIGS. 7( a ) to 7( d ) are perspective views illustrating display examples using the display device.
  • FIGS. 8( a ) to 8( d ) are perspective views illustrating other display examples using the display device.
  • FIG. 9 is a perspective view illustrating a configuration of a display device according to a second embodiment of the present invention.
  • FIG. 10 is a perspective view illustrating a configuration of a two-dimensional image display device provided in the display device.
  • FIG. 11 is a plan view illustrating a configuration of an optical path changing unit provided in the two-dimensional image display device.
  • FIG. 12 is a perspective view illustrating a display example using the display device.
  • FIGS. 13( a ) and 13( b ) are diagrams illustrating display examples using an optical element according to a third embodiment of the present invention.
  • a display device 1 A and a display method for the display device 1 A according to the first embodiment of the present invention will be described in detail with reference to FIGS. 1 to 8 .
  • the configuration of the display device 1 A will be described with reference to FIGS. 1 to 5 .
  • FIG. 1 is a perspective view illustrating the configuration of the display device 1 A.
  • FIG. 2 is a sectional view illustrating the configuration of the display device 1 A.
  • FIG. 3 is a plan view illustrating the configuration of the display device 1 A.
  • a +x direction in FIG. 1 may be described as a front direction, a ⁇ x direction as a back direction, a +y direction as a right direction, a ⁇ y direction as a left direction, a +z direction as an up direction, and a ⁇ z direction as a down direction.
  • the display device 1 A includes a light source 10 and a light guide plate (optical element) 20 .
  • the light source 10 is a member for irradiating the light guide plate 20 with light and is formed of, for example, a light emitting diode (LED).
  • the light source 10 may have a configuration including one light emitting diode or a configuration including a plurality of light emitting diodes.
  • the light guide plate 20 is a member that guides light (incident light) incident from the light source 10 , and the shape of light guide plate 20 is not limited but is substantially rectangular parallelepiped shape in the present embodiment.
  • the light guide plate 20 is formed of a transparent resin material having a relatively high refractive index.
  • a material for forming the light guide plate 20 for example, polycarbonate resin, polymethyl methacrylate resin, or the like can be used.
  • the light guide plate 20 is formed of polymethyl methacrylate resin.
  • the observer since the light guide plate 20 is transparent, the observer can visually recognize the rear surface side of the display device 1 A through the light guide plate 20 . Thereby, in the display device 1 A, the observer can visually recognize a stereoscopic image or a reference image, described later, without being conscious of the display device 1 A.
  • the light guide plate 20 includes an outgoing surface 21 , a rear surface 22 , and an incident surface 23 .
  • the outgoing surface 21 is a surface that emits light guided inside the light guide plate 20 and changed in its optical path by an optical path changing unit 30 , described later.
  • the outgoing surface 21 constitutes the front surface of the light guide plate 20 .
  • the rear surface 22 is a surface parallel to the outgoing surface 21 and is a surface on which the optical path changing unit 30 is disposed. Note that the rear surface 22 may not be parallel to the outgoing surface 21 .
  • the incident surface 23 is a surface where the light emitted from the light source 10 enters the inside of the light guide plate 20 .
  • the light emitted from the light source 10 and enters the light guide plate 20 from the incident surface 23 is totally reflected by the outgoing surface 21 or the rear surface 22 and guided through the light guide plate 20 .
  • the optical path changing unit 30 is disposed on the rear surface 22 inside the light guide plate 20 and is a member for changing the optical path of the light guided in the light guide plate 20 to emit the light from the outgoing surface 21 . Further, the optical path changing unit 30 is a member for forming a part of a stereoscopic image, or a part of a reference image, to be visually recognized by an observer. As illustrated in FIG. 3 , a plurality of optical path changing units 30 are provided on the rear surface 22 of the light guide plate 20 .
  • FIG. 4( a ) is a plan view illustrating the configuration of the optical path changing unit 30
  • FIG. 4( b ) is a perspective view illustrating the configuration of the reflector 31 a.
  • the optical path changing unit 30 is made up of optical path changing unit groups 31 , 32 , 33 . . . .
  • the optical path changing unit groups 31 to 33 are illustrated.
  • Each of the optical path changing unit groups 31 , 32 , 33 . . . is formed by a plurality of reflectors (prisms) provided along a direction parallel to the incident surface 23 .
  • the optical path changing unit group 31 is made up of a plurality of reflectors 31 a.
  • the optical path changing unit groups 32 , 33 . . . are made up of a plurality of reflectors 32 a, 33 a, . . . , respectively.
  • the reflector 31 a has a triangular pyramidal shape and has a reflective surface 31 a a that reflects (totally reflects) the incident light.
  • the reflector 31 a may be a recess formed on the rear surface 22 of the light guide plate 20 .
  • the reflectors 32 a, 33 a . . . also have the same structure as the reflector 31 a.
  • the reflector 31 a is not limited to the triangular pyramid shape.
  • FIG. 5 is a perspective view illustrating the arrangement of the reflectors 31 a, 32 a, 33 a in the optical path changing unit 30 .
  • each of the optical path changing unit groups 31 , 32 , 33 . . . changes the optical path of the incident light and emits the light in various directions from the outgoing surface 21
  • one plane image I which is a part of a stereoscopic image
  • a stereoscopic image forming plane P which is a plane vertical to the outgoing surface 21 of the light guide plate 20 by the light path changed by the optical path changing unit 30
  • FIG. 6 is a perspective view illustrating a method for forming the plane image I by the optical path changing unit 30 .
  • the formation of a ring mark with diagonal lines as a plane image I on a stereoscopic image forming plane P will be described.
  • the light changed in its optical path by each reflector 31 a of the optical path changing unit group 31 intersects the stereoscopic image forming plane P on a line La 1 and a line La 2 .
  • a line image LI which is a part of the plane image I is formed on the stereoscopic image forming plane P.
  • the line image LI is a line image parallel to the YZ plane.
  • the line image LI of the line La 1 and the line La 2 is formed by the light from each of a large number of reflectors 31 a belonging to the optical path changing unit group 31 .
  • the light for forming the images of the lines La 1 , La 2 may be provided by at least two reflectors 31 a in the optical path changing unit group 31 .
  • each reflector 32 a of the optical path changing unit group 32 intersects the stereoscopic image forming plane P at the lines Lb 1 , Lb 2 or Lb 3 .
  • a line image LI which is a part of the plane image I is formed on the stereoscopic image forming plane P.
  • each reflector 33 a of the optical path changing unit group 33 intersects the stereoscopic image forming plane P at the line Lc 1 or Lc 2 .
  • a line image LI which is a part of the plane image I is formed on the stereoscopic image forming plane P.
  • the positions in the X-axis direction of the line images formed by the optical path changing unit groups 31 , 32 , 33 . . . are different from each other.
  • the display device 1 A by reducing the distances among the optical path changing unit groups 31 , 32 , 33 . . . , it is possible to reduce the distance in the X-axis direction of the line image LI to be formed by each of the optical path changing unit groups 31 , 32 , 33 . . . .
  • the plane image I is substantially formed on the stereoscopic image forming plane P.
  • the stereoscopic image forming plane P may be a plane vertical to the X-axis, a plane vertical to the Y-axis, or a plane vertical to the Z-axis. Further, the stereoscopic image forming plane P may be a plane that is not vertical to the X-axis, the Y-axis, or the Z-axis. Moreover, the stereoscopic image forming plane P may be a curved surface instead of a plane. That is, the display device 1 A can cause the optical path changing unit 30 to form the plane image I on an arbitrary plane (plane and curved surface) on the space.
  • a plane image is formed on a stereoscopic image forming plane, which is vertical to the outgoing surface 21 , by light changed in its optical path by one optical path changing unit 30 among the plurality of optical path changing units 30 .
  • a plane image is formed on a stereoscopic image forming plane, which is parallel to the outgoing surface 21 , by light changed in its optical path by another optical path changing unit 30 among the plurality of optical path changing units 30 .
  • each optical path changing unit 30 is described in a single region, but this is for the convenience of description, and the display device of the present invention is not limited thereto. That is, in the display device of one aspect of the present invention, for example, two optical path changing units 30 for displaying two stereoscopic images may be provided in the same region.
  • FIGS. 7( a ) to 7( d ) and 8( a ) to 8( d ) are perspective views illustrating a display example of a stereoscopic image by using the display device 1 A.
  • optical path changing units 30 a, 30 b, 30 c are referred to as optical path changing units 30 a, 30 b, 30 c.
  • Display Example 1 will be described with reference to FIG. 7( a ) .
  • the display device 1 A forms a stereoscopic image I 1 which is a plane image on a stereoscopic image forming plane P 1 which is a plane vertical to the outgoing surface 21 of the light guide plate 20 .
  • the display device 1 A forms the stereoscopic image I 1 on the stereoscopic image forming plane P 1 by the light changed in its optical path by the optical path changing unit 30 a.
  • the display device 1 A forms the image of the stereoscopic image I 1 on the stereoscopic image forming plane P 1 which is a plane vertical to the outgoing surface 21 .
  • the display device 1 A enables the observer to visually recognize the stereoscopic image I 1 having a stereoscopic effect.
  • the display device 1 A of the present invention is not limited thereto. That is, the display device 1 A according to one embodiment of the present invention may form (display) the stereoscopic image I 1 on a plane not parallel to the outgoing surface 21 . In this case, the stereoscopic image I 1 is formed on a plane intersecting a plane parallel to the outgoing surface 21 . Thereby, even when the transparent light guide plate 20 is used, the display device 1 A enables the observer to visually recognize the stereoscopic image I 1 having a stereoscopic effect.
  • the stereoscopic image I 1 may be a part of a stereoscopic image formed by the display device 1 A. That is, a stereoscopic image which is at least a part of the stereoscopic image may be formed (displayed) on the stereoscopic image forming plane P 1 .
  • the stereoscopic image I 2 includes a plane image I 2 a formed on a stereoscopic image forming plane P 2 which is a plane parallel to the outgoing surface 21 of the light guide plate 20 , and a plane image I 2 b formed on a stereoscopic image forming plane P 3 which is a plane parallel to the outgoing surface 21 and different from the stereoscopic image forming plane P 2 .
  • the display device 1 A forms the plane image I 2 a on the stereoscopic image forming plane P 2 by the light changed in its optical path by the optical path changing unit 30 b, and the plane image I 2 b on the stereoscopic image forming plane P 3 which is a plane parallel to the outgoing surface 21 by the light changed in its optical path by the optical path changing unit 30 c
  • the display device 1 A forms the plane images I 2 a, I 2 b on the stereoscopic image forming planes P 2 , P 3 , which are planes parallel to the outgoing surface 21 , respectively (i.e., the display device 1 A forms the stereoscopic image I 2 ). That is, the stereoscopic image I 2 has two planes (plane images I 2 a, I 2 b ) positioned on mutually different planes. As a result, even when the transparent light guide plate 20 is used, the display device 1 A can make the observer feel that the plane images I 2 a, I 2 b are formed on mutually different planes. That is, the display device 1 A enables the observer to visually recognize the stereoscopic image I 2 having a stereoscopic effect.
  • the stereoscopic image I 2 is made up of the two plane images I 2 a, I 2 b, but the display device 1 A of the present invention is not limited thereto. That is, the stereoscopic image I 2 formed by the display device 1 A may include plane images that are different from each other and formed on three or more stereoscopic image forming planes parallel to one another.
  • the display device 1 A of the present invention is not limited thereto. That is, as illustrated in FIG. 7( c ) , the display device 1 A according to the embodiment of the present invention may form (display) plane images I 3 a, I 3 b as a stereoscopic image I 3 on stereoscopic image forming planes P 1 , P 4 which are planes vertical to the outgoing surface 21 .
  • the display device 1 A is not limited to the aspect in which the stereoscopic image with two plane images is formed on the stereoscopic image forming planes that are parallel to each other. That is, the display device 1 A according to one aspect of the present invention may display stereoscopic images having two mutually different planes positioned on planes that are not parallel to each other.
  • the stereoscopic image formed by the display device 1 A may include another surface or line besides the two planes.
  • Display Example 3 will be described with reference to FIG. 7( d ) .
  • the display device 1 A forms a stereoscopic image I 2 A.
  • the stereoscopic image I 2 A has a line image I 2 c in addition to the plane images I 2 a, I 2 b in the stereoscopic image I 2 of Display Example 2.
  • the line image I 2 c is a line segment connecting the plane image I 2 a and the plane image I 2 b formed on two mutually different planes.
  • the line image I 2 c is formed by the light changed in its optical path by an optical path changing unit 30 d.
  • the display device 1 A forms the stereoscopic image I 2 A having a line image I 2 c that connects the plane image I 2 a and the plane image I 2 b .
  • the display device 1 A forms the stereoscopic image I 2 A having a line image I 2 c that connects the plane image I 2 a and the plane image I 2 b .
  • Display Example 4 will be described with reference to FIG. 8( a ) .
  • the display device 1 A forms a triangular prismatic stereoscopic image I 4 .
  • the stereoscopic image I 4 includes two line segments (e.g., line segments I 4 a, I 4 b illustrated in FIG. 8( a ) ) that are parallel to one plane and are not parallel to each other, and one line segment that is not parallel to the plane (i.e., line segment I 4 c illustrated in FIG. 8( a ) .
  • the stereoscopic image I 4 is a stereoscopic image with a high stereoscopic effect.
  • the display device 1 A enables the observer to visually recognize the stereoscopic image I 4 having a stereoscopic effect.
  • the display device 1 A forms a triangular prismatic stereoscopic image I 4 , but the display device 1 A of the present invention is not limited thereto. That is, the stereoscopic image I 4 formed by the display device 1 A may be any stereoscopic image so long as including two line segments that are parallel to one plane and are not parallel to each other and one line segment that is not parallel to the plane. A stereoscopic image including such three components cannot be fit on one plane but always becomes a stereoscopic image having a three-dimensional shape.
  • Display Example 5 will be described with reference to FIG. 8( b ) .
  • the display device 1 A forms a reference image R 1 separately from the stereoscopic image I 1 in Display Example 1.
  • the reference image R 1 includes two line segments R 1 a, R 1 b that are parallel to the outgoing surface 21 and orthogonal to each other. Line segments R 1 a, R 1 b intersect at a point Q.
  • the reference image R 1 is formed by the light changed in its optical path by the optical path changing unit 30 e.
  • the display device 1 A forms the reference image R 1 separately from the stereoscopic image I 1 .
  • the observer can recognize the stereoscopic image I 1 with reference to the reference image R 1 as a reference, the observer can visually recognize the stereoscopic image I 1 as an image having a more stereoscopic effect as compared with Display Example 1.
  • the reference image R 1 has two line segments R 1 a, R 1 b parallel to the outgoing surface 21 , but the display device 1 A of the present invention is not limited thereto. That is, the reference image R 1 formed by the display device 1 A may be an image that includes two line segments orthogonal to each other, and is not necessarily required to be parallel to the outgoing surface 21 .
  • the display device 1 A of the present invention is not limited thereto. That is, as illustrated in FIG. 8( c ) , the display device 1 A of one embodiment of the present invention may form a reference image R 2 made up of a plane image parallel to the outgoing surface 21 .
  • the observer can recognize the stereoscopic image I 1 with reference to the reference image R 2 , so that the observer can visually recognize the stereoscopic image I 1 as an image having a more stereoscopic effect as compared with Display Example 1.
  • the reference image R 2 is made of the plane image and can thus be said to include two line segments orthogonal to each other.
  • the plane on which the reference images R 1 , R 2 are formed may be parallel to the plane on which the stereoscopic image I 1 is formed but is preferably not parallel thereto in order to improve the stereoscopic effect of the stereoscopic image I 1 .
  • the plane on which the reference images R 1 , R 2 are formed is more preferably vertical to the plane on which the stereoscopic image I 1 is imaged. Further, the plane on which the reference images R 1 , R 2 are formed is preferably parallel to the outgoing surface 21 .
  • the display method in the present display example is also effective particularly in a display device that displays stereoscopic images by fusion due to parallax, using light emitted from a light guide plate as a transparent optical element. That is, in a parallax type stereoscopic image display device, by enabling the observer to recognize (by displaying) a reference image including two line segments orthogonal to each other separately from an image recognized by the observer as a stereoscopic image, thus enabling the observer to visually recognize a stereoscopic image having a stereoscopic effect.
  • a display device 1 A forms the reference image R 1 A separately from the stereoscopic image I 1 in Display Example 1.
  • the reference image R 1 A includes a line segment R 1 c in addition to the line segments R 1 a, R 1 b in the reference image R 1 of Display Example 5.
  • the line segment R 1 c is a line segment orthogonal to the line segments R 1 a , R 1 b.
  • the display device 1 A forms a reference image R 1 A made up of the three line segments R 1 a, R 1 b , R 1 c orthogonal to each other separately from the stereoscopic image I 1 .
  • the observer can visually recognize the stereoscopic image I 1 as an image having a more stereoscopic effect as compared with Display Example 5.
  • Each of the line segments R 1 a, R 1 b, R 1 c may be imaged on a plane different from the plane on which the stereoscopic image I 1 is formed.
  • the line segment R 1 c may be parallel to the plane on which the stereoscopic image I 1 is imaged.
  • the displayed stereoscopic image I 1 may be blurred or its contrast may deteriorate, so that the stereoscopic effect of the stereoscopic image I 1 may be impaired.
  • Display Example 6 by forming the reference image R 1 A composed of three line segments R 1 a, R 1 b, R 1 c orthogonal to each other, separately from the stereoscopic image I 1 , it is possible to increase trails to obtain a stereoscopic effect of the stereoscopic image I 1 . As a result, it is possible for the observer to visually recognize a stereoscopic image having a stereoscopic effect.
  • the reference images R 1 , R 1 A, R 2 in Display Examples 5 and 6 have been images each formed by light changed in its optical path by the optical path changing unit 30 of the display device 1 A.
  • the display device 1 A of the present invention is not limited thereto. That is, in the display device 1 A of one embodiment of the present invention, a line or a plane image as a reference image may actually be drawn on the outgoing surface 21 or the rear surface 22 of the light guide plate 20 by using a marker or the like, for example.
  • the drawn reference image may be displayed separately from the stereoscopic image.
  • a transparent sheet (thin film) in which a line or a plane image as a reference image is actually drawn by using a marker or the like is provided on (pasted to) the outgoing surface 21 or the rear surface 22 of the light guide plate 20 , the drawn reference image may be displayed separately from the stereoscopic image.
  • a display device for displaying a stereoscopic image is provided with a frame (image frame) around an optical element that emits light that is recognized as a stereoscopic image to an observer.
  • a frame image frame
  • This enables the observer to recognize the stereoscopic image as an image having a stereoscopic effect with the frame as the reference plane.
  • the display device is used as a guide plate or the like, it is preferable to omit the frame and make the observer unconscious of the display device.
  • the display device 1 A by displaying a stereoscopic image as in Display Examples 1 to 6 above, even in the absence of the frame (image frame) (i.e., when the light guide plate 20 is transparent), it is possible for the observer to visually recognize a stereoscopic image having a stereoscopic effect.
  • FIGS. 9 to 12 For convenience of description, members having the same functions as the members described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.
  • a configuration of a display device 1 B in the present embodiment will be described with reference to FIG. 9
  • FIG. 9 is a perspective view illustrating the configuration of the display device 1 B.
  • the display device 1 B includes a two-dimensional image display device 40 in addition to the configuration of the display device 1 A in the first embodiment, and a light guide plate 60 of the two-dimensional image display device 40 , described later, is superimposed on to the light guide plate 20 .
  • FIG. 10 is a perspective view illustrating a configuration of the two-dimensional image display device 40 .
  • FIG. 11 is a plan view illustrating a configuration of an optical path changing unit 80 provided in the two-dimensional image display device 40 .
  • the two-dimensional image display device 40 includes a light source 50 and the light guide plate (optical element) 60 .
  • the light source 50 is a member for irradiating the light guide plate 60 with light, and is formed of, for example, a light emitting diode (LED).
  • the light source 50 may have a configuration including one light emitting diode or a configuration including a plurality of light emitting diodes.
  • the light guide plate 60 is a member that guides light incident from the light source 50 , and the shape of light guide plate 60 is not limited but is substantially rectangular parallelepiped shape in the present embodiment.
  • the light guide plate 60 has substantially the same size as the light guide plate 20 in the display device 1 A.
  • the light guide plate 60 is formed of a transparent resin material having a relatively high refractive index.
  • a material for forming the light guide plate 60 for example, polycarbonate resin, polymethyl methacrylate resin, or the like can be used.
  • the light guide plate 60 is formed of polymethyl methacrylate resin.
  • the observer can visually recognize the rear surface side of the display device 1 B through the light guide plate 20 and the light guide plate 60 . Thereby, in the display device 1 B, the observer can visually recognize a stereoscopic image or a reference image without being conscious of the display device 1 B.
  • the light guide plate 60 includes an outgoing surface 61 , a rear surface 62 , and an incident surface 63 .
  • the outgoing surface 61 is a surface that emits light guided inside the light guide plate 60 , the light changed in its optical path by an optical path changing unit 80 described later.
  • the outgoing surface 61 constitutes the front-side surface (front surface) of the light guide plate 60 .
  • the rear surface 62 is a surface parallel to the outgoing surface 61 and is a surface on which the optical path changing unit 80 is disposed. The detail of the optical path changing unit 80 will be described later.
  • the incident surface 63 is a surface where the light emitted from the light source 50 enters the inside of the light guide plate 60 .
  • the optical path changing unit 80 is disposed on the rear surface 62 inside the light guide plate 60 and is a member for changing the optical path of the light guided in the light guide plate 60 to emit the light from the outgoing surface 61 .
  • the optical path changing unit 80 is made up of optical path changing unit groups 81 , 82 , 83 . . . . Note that FIG. 11 only illustrates the optical path changing unit groups 81 to 83 for the sake of simplicity.
  • Each of the optical path changing unit groups 81 , 82 , 83 . . . is provided along the direction parallel to the incident surface 63 , and is each formed of a part of the Fresnel lens.
  • a point image is formed on the stereoscopic image forming plane by the light changed in its optical path by the optical path changing unit group 81 .
  • a point image is formed on the stereoscopic image forming plane by the light changed in its optical path by each of the optical path changing unit groups 82 , 83 . . . .
  • the display device 1 B by reducing the distances among the optical path changing unit groups 81 , 82 , 83 . . . , it is possible to reduce the distance of the point image to be formed by each of the optical path changing unit groups 81 , 82 , 83 . . . .
  • a stereoscopic image which is a line image, is substantially formed on the stereoscopic image forming plane.
  • FIG. 12 is a perspective view illustrating a display example by the display device 1 B.
  • the light guide plate 60 is provided as superimposed on the light guide plate 20 . Therefore, as illustrated in FIG. 12 , the stereoscopic image I 1 is formed by the light emitted from the light guide plate 20 , and the two-dimensional image D, which is made of a plane image and parallel to the outgoing surface 21 , is formed by the light emitted from the light guide plate 60 .
  • the observer can recognize the two-dimensional image D as the stereoscopic image I 1 as the reference image R 2 in Display Example 5 described above, so that the observer can visually recognize the stereoscopic image I 1 as an image having a more stereoscopic effect as compared with Display Example 1.
  • the light guided inside the light guide plate 20 or the light guide plate 60 is changed in its optical path by the optical path changing unit, emitted from the outgoing surface 21 or 61 to form a stereoscopic image or a reference image.
  • the display method of the present invention is not limited thereto. That is, light may be emitted from the optical element by using light emitted from an object to be an original image of a stereoscopic image or a reference image to form a stereoscopic image or a reference image.
  • a display device that emits light from an optical element by using light emitted from an object to be an original image and forms a stereoscopic image or a reference image is, for example, as follows: (1) a display device using a two-sided reflector array structure in which a plurality of mutually orthogonal mirror surface elements are arranged in the optical coupling element plane as disclosed in Patent Document 2; and (2) a so-called “Pepper's ghost” display device using a half mirror.
  • the optical element such as the two-sided reflector array structure or the half mirror (hereinafter referred to as an optical element 100 ) is transparent and the observer can visually recognizes the rear surface side of the display device through the optical element 100 .
  • FIGS. 13( a ) and 13( b ) are diagrams illustrating display examples of a display method using the optical element 100 . Display Examples 7 and 8 in the case of using the optical element 100 will be described with reference to FIG. 13 .
  • Display Example 7 will be described with reference to FIG. 13( a ) .
  • a display N 1 and a display N 2 that each emit light to be an original image of a stereoscopic image I 5 are arranged on one side with respect to the optical element 100 .
  • the display N 1 and the display N 2 are disposed in parallel to each other.
  • the light emitted from each of the display N 1 and the display N 2 enters the optical element 100 , changed in its optical path by the optical element 100 , and emitted from the optical element 100 .
  • each of a plane image I 5 a and a plane image I 5 b as the stereoscopic image I 5 is formed on the side opposite to the one side with respect to the optical element 100 .
  • the plane images I 5 a, I 5 b are formed (i.e., the stereoscopic image I 5 is formed). That is, the stereoscopic image I 5 has two planes (plane images I 5 a, I 5 b ) positioned on mutually different planes.
  • the transparent optical element 100 it is possible to make the observer feel that the plane images I 5 a, I 5 b are formed on different planes. That is, in the present display example, it is possible for the observer to visually recognize the stereoscopic image I 5 having a stereoscopic effect.
  • Display Example 8 will be described with reference to FIG. 13( b ) .
  • a display N 1 and a display N 3 that each emit light to be an original image of a stereoscopic image I 6 are arranged on one side with respect to the optical element 100 .
  • the display N 3 includes a transparent light guide plate that emits light to be an original image.
  • the display N 1 and the display N 3 are arranged vertically to each other. The light emitted from each of the display N 1 and the display N 2 enters the optical element 100 , changed in its optical path by the optical element 100 , and emitted from the optical element 100 .
  • each of a plane image I 6 a and a plane image I 6 b as the stereoscopic image I 6 is formed on the side opposite to the one side with respect to the optical element 100 .
  • the display N 3 includes a transparent light guide plate. Therefore, as illustrated in FIG. 13( b ) , even when the display N 3 is positioned closer to the optical element 100 than the display N 1 , the light emitted from the display N 1 can be transmitted through the display N 3 to form the plane image I 6 a.
  • the plane images I 6 a, I 6 b are formed (i.e., the stereoscopic image I 6 is formed). That is, the stereoscopic image I 6 has two mutually vertical surfaces (plane images I 6 a , I 6 b ).
  • the transparent optical element 100 it is possible to make the observer feel that the plane images I 6 a, I 6 b are formed on different planes. That is, in the present display example, it is possible for the observer to visually recognize the stereoscopic image I 6 having a stereoscopic effect.
  • the display N 3 includes the transparent light guide plate that emits light, but the present invention is not limited thereto.
  • a member provided with a light emitting body e.g., a light emitting diode arranged on a matrix or a light emitting wire
  • a transparent flat plate e.g., glass plate
  • a display method is a display method for a stereoscopic image, using a display device provided with a transparent optical element, the display method including: emitting light to be recognized by an observer as a stereoscopic image from the optical element; and displaying at least a part of the stereoscopic image on a plane not parallel to an outgoing surface of the optical element.
  • the observer is able to visually recognize a rear surface side of the display device through the optical element.
  • the stereoscopic image is formed on a plane that intersects with a plane parallel to the outgoing surface, even when the optical element is transparent, it is possible for the observer to visually recognize a stereoscopic image having a stereoscopic effect.
  • At least a part of the stereoscopic image may be displayed on a plane vertical to the outgoing surface of the optical element.
  • a display method is a display method for a stereoscopic image, using a display device provided with a transparent optical element, the display method including emitting light to be recognized by an observer as a stereoscopic image from the optical element.
  • the observer is able to visually recognize a rear surface side of the display device through the optical element, and the stereoscopic image has two planes positioned on mutually different planes.
  • the two planes may be parallel to each other.
  • the stereoscopic image have a line connecting the two planes.
  • the two planes may be vertical to each other.
  • a display method is a display method for a stereoscopic image, using a display device provided with a transparent optical element, the display method including emitting light to be recognized by an observer as a stereoscopic image from the optical element.
  • the observer is able to visually recognize a rear surface side of the display device through the optical element, and the stereoscopic image includes two line segments that are parallel to one plane and are not parallel to each other and one line segment that is not parallel to the plane.
  • the plane may be parallel to an outgoing surface of the optical element.
  • a reference image including two line segments orthogonal to each other be displayed separately from the stereoscopic image.
  • the observer can recognize the stereoscopic image with reference to the reference image as a reference, the observer can visually recognize the stereoscopic image as an image having a more stereoscopic effect.
  • the two line segments included in the reference image may be parallel to an outgoing surface of the optical element.
  • the two line segments included in the reference image may intersect at one point.
  • the reference image may include one line segment orthogonal to the two line segments included in the reference image.
  • the reference image may be formed of light emitted from the optical element.
  • another optical element may be provided so as to be superimposed on the optical element, and the reference image may be formed of light emitted from another optical element.
  • a transparent sheet on which an image as the reference image is drawn may be provided on the optical element.
  • the optical element may form the stereoscopic image by guiding light incident from the light source, changing an optical path of the guided light, and emitting the light from the outgoing surface to form the stereoscopic image.
  • a display device displays a stereoscopic image by any one of the above display methods.
  • the present invention is not limited to each of the embodiments described above, but can be subjected to a variety of changes in the scope shown in the claims. An embodiment obtained by appropriately combining technical units disclosed respectively in different embodiments is also included in a technical scope of the present invention.
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CN112558321A (zh) 2021-03-26
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US20210215949A1 (en) 2021-07-15
CN109804298A (zh) 2019-05-24

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