JP2018049109A - Stereoscopic image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereoscopic image display device that enables an observer to observe a stereoscopic image even when an observation position is shifted.SOLUTION: A stereoscopic image display device comprises: a screen that includes a light collection part and a light diffusion part arranged in a direction in which light passes; a first projector that emits first image light to the screen; a second projector that emits second image light to the screen; a detection part that detects the position of an observer; and a driving part that moves at least the light collection part of the screen on the basis of a result of detection performed by the detection part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stereoscopic image display device.

  2. Description of the Related Art Conventionally, there is a stereoscopic image display device that allows an observer to observe a stereoscopic image by projecting two images having left and right eye parallax on a screen using two projectors (see, for example, Patent Document 1 below). In this stereoscopic image display device, the return position of the reflected light from the screen is controlled in accordance with the viewpoint position of the observer so that the stereoscopic image can be viewed even when the observer's viewpoint moves.

JP-A-10-115878

  However, since the stereoscopic image display device uses a recurrent screen having a characteristic of returning reflected light to the light source direction as the screen, the return position of the reflected light cannot be controlled even if the position and orientation of the screen are changed. . That is, in the conventional stereoscopic image display device, the stereoscopic image cannot be observed well when the observer's observation position is shifted.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a stereoscopic image display apparatus that can observe a stereoscopic image even when the observation position is shifted.

  According to the first aspect of the present invention, a screen including a condensing unit and a light diffusing unit arranged in a direction in which light passes, a right-eye projector that emits first image light to the screen, and the screen On the other hand, a second projector that emits second image light, a detection unit that detects the position of the observer, and a drive unit that moves at least the condensing unit of the screen based on the detection result of the detection unit; Are provided.

  According to the stereoscopic image display device according to the first aspect, even when the observation position of the observer is deviated from a predetermined position, the observer can move to the observable range where the stereoscopic image can be observed by moving the condensing unit. The eyes can be positioned. Therefore, the observer can observe the stereoscopic image stably even when the observation position is shifted.

  In the first aspect, the condensing unit is a Fresnel lens, and in the light diffusion unit, the light diffusion angle in the first direction of the screen is smaller than the light diffusion angle in the second direction intersecting the first direction. It is preferable that the driving unit moves at least the light collecting unit in the first direction.

  According to this configuration, the size of the observable range in the first direction is narrower than the size of the observable range in the second direction. If this invention is employ | adopted, an observable range can be moved to a 1st direction by moving a condensing part to a 1st direction. Therefore, even when the observer's observation position is shifted in the first direction, the observer's eyes can be positioned within the observable range. Therefore, the observer can observe the stereoscopic image stably without worrying about the deviation of the observation position in the first direction.

  In the first aspect, the condensing part is a linear Fresnel lens, and the light diffusion part has a light diffusion angle in a step direction of the linear Fresnel lens that is smaller than a light diffusion angle in a direction intersecting the step direction. The driving unit preferably moves at least the light collecting unit in the step direction.

  According to this configuration, the size of the observable range in the step direction is narrower than the size of the observable range in the direction intersecting the step direction. If the present invention is adopted, the observable range can be moved in the step direction by moving the light collecting portion in the step direction. Therefore, even when the observer's observation position is shifted in the step direction, the observer's eyes can be positioned within the observable range. Therefore, the observer can observe the stereoscopic image stably without worrying about the deviation of the observation position in the step direction.

  In the first aspect, it is preferable that the condensing part is a Fresnel lens, and the light diffusion characteristic of the light diffusion part is isotropic.

  According to this configuration, since the light projected from the projector is collected around the eyes of the observer, the light use efficiency is increased. Therefore, power saving can be realized by suppressing the light output of the projector.

  In the first aspect, it is preferable that the screen further includes a reflection member that reflects light transmitted through the light collecting unit and the light diffusion unit.

  According to this configuration, a reflective screen can be realized. In addition, when a reflective screen is used, an observer and a projector are positioned on one side of the screen, so that the image display device can be used in a smaller space than when a transmissive screen is used.

  In the first aspect, the imaging device that images the observer, and the first image light and the second image light emitted from the first projector and the second projector are transmitted or reflected and incident on the screen. A half mirror that causes the first projector and the second projector to project the first image light and the second image light corresponding to an image captured by the imaging device, and the half mirror includes: It is preferable that the first image light and the second image light reflected by the screen are reflected or transmitted and guided to the observer.

  According to this configuration, by moving the position of the observable range following the position of the observer, the observer can always observe his / her face three-dimensionally without worrying about the observation position. .

1 is a diagram illustrating a schematic configuration of an image display device according to a first embodiment. The side view which shows the positional relationship of a projector, a screen, and an observer. The top view which shows the positional relationship of a projector, a screen, and an observer. Sectional drawing which shows the structure of a screen. The front view and sectional drawing which show the structure of a Fresnel lens. The figure which shows the diffusion characteristic of a diffusion sheet. FIG. 3 is a plan view conceptually illustrating how the right eye image is viewed by an observer. FIG. 4 is a plan view conceptually illustrating how an image for the left eye is viewed by an observer. The side view which explained notionally how an image looks in the up-and-down direction of an observer. The figure which shows the relationship between the movement of a screen, and the change of the observation range of an observer. Sectional drawing which shows the structure of the screen of 2nd Embodiment. The front view and sectional drawing which show the structure of a linear Fresnel lens. The side view which explained notionally how an image looks in the up-and-down direction of an observer. The figure which shows the diffusion characteristic of the diffusion sheet used for the screen of 3rd Embodiment. The figure which shows schematic structure of the image display apparatus of 4th Embodiment. Sectional drawing which shows the structure of the screen of 4th Embodiment. FIG. 3 is a plan view conceptually illustrating how the right eye image is viewed by an observer. FIG. 4 is a plan view conceptually illustrating how an image for the left eye is viewed by an observer. The side view which explained notionally how an image looks in the up-and-down direction of an observer. The figure which shows the relationship between the movement of a screen, and the change of the observation range of an observer. The figure which shows schematic structure of the image display apparatus of 5th Embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In addition, in the drawings used in the following description, in order to make the features easy to understand, there are cases where the portions that become the features are enlarged for the sake of convenience, and the dimensional ratios of the respective components are not always the same as the actual ones. Absent.

(First embodiment)
The image display apparatus according to the present embodiment projects right-eye image light and left-eye image light corresponding to binocular parallax on a screen, and observes with right-eye image light and left-eye image light transmitted through the screen. This is a device that displays a stereoscopic image on the eyes of a person.

  FIG. 1 is a diagram illustrating a schematic configuration of an image display apparatus 100 according to the present embodiment. As shown in FIG. 1, the image display device 100 includes a projector 1R, a projector 1L, a screen 10, a drive unit 11, a position detection unit 12, and a control device 15.

FIG. 2 is a side view showing the positional relationship between the projectors 1R and 1L, the screen 10, and the observer, and FIG. 3 is a plan view showing the positional relationship.
As shown in FIGS. 2 and 3, the observer M visually recognizes a stereoscopic image by being positioned on the opposite side of the two projectors 1R and 1L with respect to the screen 10 and in the center of the two projectors 1R and 1L. To do.

  For example, the projector 1R and the projector 1L are fixed by being suspended from a ceiling in a room where the image display apparatus 100 is installed. The projector (right-eye projector) 1 </ b> R is a projector that projects right-eye image light GR onto the screen 10. The projector 1R is arranged on the right side with respect to the central axis 10c of the screen 10 when the light incident surface of the screen 10 is viewed in plan. In the present embodiment, the projector 1R corresponds to the “first projector” recited in the claims, and the right eye image light GR corresponds to the “first image light” recited in the claims.

  The projector 1L is a projector that projects the image light GL for the left eye onto the screen 10. The projector 1L is disposed on the left side with respect to the central axis 10c of the screen 10 when the light incident surface of the screen 10 is viewed in plan. In the present embodiment, the projector 1L corresponds to the “second projector” recited in the claims, and the image light GL for the left eye corresponds to “second image light” recited in the claims.

  The projectors 1R and 1L have the same configuration, and are different only in that image signals corresponding to the right eye image light GR and the left eye image light GL are respectively input. Therefore, when the video signals input to each other are interchanged, the projector 1R can project the image light GL for the left eye on the screen 10, and the projector 1L can project the image light GR for the right eye on the screen 10.

  In the present embodiment, the screen 10 is a transmissive screen that transmits light from the projectors 1R and 1L. The planar shape of the screen 10 is a rectangular shape. In the present embodiment, the screen 10 has a shape that is long along the left-right direction (first direction) of the observer M and short along the up-down direction (second direction) of the observer M. In the present embodiment, the left-right direction and the up-down direction are orthogonal (intersect).

  FIG. 4 is a cross-sectional view showing the configuration of the screen 10. FIG. 4 corresponds to a cross section passing through the central axis 10 c of the screen 10. As shown in FIG. 4, the screen 10 includes a Fresnel lens (light condensing unit) 5 and a diffusion sheet (light diffusion unit) 6 from the light incident direction. The Fresnel lens 5 and the diffusion sheet 6 are integrally held via a frame member (not shown).

FIG. 5 is a front view of the Fresnel lens 5 viewed from the light incident direction and a cross-sectional view passing through the center of the Fresnel lens 5. As shown in FIG. 5, the Fresnel lens 5 is a lens obtained by dividing a plano-convex lens into a plurality of concentric regions, and has a sawtooth cross-sectional shape. Thereby, the Fresnel lens 5 suppresses the thickness of the whole lens.
Based on such a configuration, the Fresnel lens 5 can be regarded as equivalent to a lens having a condensing function and an image forming function in the same manner as the convex lens. The sawtooth cross section can also be regarded as a prism.

  In the present embodiment, the Fresnel lens 5 is disposed on the light incident surface side with respect to the diffusion sheet 6, but the Fresnel lens 5 may be disposed on the light exit surface side. In other words, the screen 10 may have a structure in which the positions of the Fresnel lens 5 and the diffusion sheet 6 are reversed right and left.

  The diffusion sheet 6 is a member that diffuses light transmitted through the Fresnel lens 5. In the present embodiment, the diffusion sheet 6 has anisotropy in light diffusion characteristics.

  FIG. 6 is a diagram showing the diffusion characteristics of the diffusion sheet 6. In FIG. 6, the horizontal axis represents the emission angle with respect to the incident angle, and the vertical axis represents the light transmittance.

  As shown in FIG. 6, the diffusion sheet 6 of the present embodiment has anisotropic characteristics such that the full width at half maximum is several degrees in the left-right direction and the full width at half maximum is several tens of degrees in the vertical direction. That is, in the diffusion sheet 6, the diffusion angle in the horizontal direction (first direction) is smaller than the diffusion angle in the vertical direction (second direction).

  The drive unit 11 can move the screen 10. The drive part 11 is comprised from an actuator, for example. In the present embodiment, the drive unit 11 is attached to the lower part (not shown) of the screen 10. The drive unit 11 can move the entire screen 10 at least in the left-right direction.

  In the present embodiment, the position detection unit 12 is attached to the upper part of the screen 10. For example, the position detection unit 12 includes two ultrasonic sensors installed on both sides of the upper portion of the screen 10, and the position of the head of the observer M in the left-right direction, specifically, the observer's eyes (viewpoint). ) Position can be detected. The position detection unit 12 is electrically connected to the control device 15 and transmits a detection result to the control device 15.

  The control device 15 controls driving of each component of the image display device 100. That is, the control device 15 controls the projectors 1R and 1L and the drive unit 11. In the present embodiment, the control device 15 controls the position of the screen 10 by the drive unit 11 based on the result transmitted from the position detection unit 12.

Subsequently, the operation of the image display apparatus 100 of the present embodiment will be described.
First, how the observer M sees the image will be described.
FIG. 7A is a plan view conceptually illustrating how the right-eye image is viewed by the observer M, and FIG. 7B is a plan view conceptually illustrating how the left-eye image is viewed by the observer. 7C is a side view conceptually illustrating how the viewer M looks in the vertical direction.

  As shown in FIG. 7A, the right eye image light GR projected from the projector 1 </ b> R enters the screen 10. In FIGS. 7A to 7C, the right-eye image light GR shows only the central ray and the right and left rays for easy viewing.

  The right-eye image light GR is refracted by the Fresnel lens 5 when passing through the screen 10. In the present embodiment, since the screen 10 includes the diffusion sheet 6 in addition to the Fresnel lens 5, each light ray GR1 constituting the right eye image light GR is diffused in the horizontal direction (left-right direction) by the diffusion sheet 6. The diffused light ray GR1 is shown by a two-dot chain line.

  Since the right-eye image light GR is diffused by passing through the screen 10 in this way, the light ray GR1 is condensed not in one point but in a range Re indicated by hatching in FIG. 7A. This range Re corresponds to a range in which the right-eye image G1 can be observed. Hereinafter, the range Re is referred to as an observable range Re. In the present embodiment, the focus of the projector 1R is adjusted so that the image light GR for the right eye forms an image on the diffusion sheet 6.

  As shown in FIG. 7B, the image light GL for the left eye projected from the other projector 1L enters the screen 10. In FIGS. 7A to 7C, for the left eye image light GL, only the central light beam and the left and right light beams are shown for easy viewing.

  Each light beam GL1 constituting the image light GL for the left eye is diffused in the left-right direction by the diffusion sheet 6. Note that the diffused light beam GL1 is shown by a two-dot chain line. Similarly, the image light GL for the left eye is diffused by passing through the screen 10, and the light beam GL1 is collected in a range Le indicated by hatching in FIG. 7B. This range Le corresponds to a range in which the image for the left eye can be observed. Hereinafter, the range Le is referred to as an observable range Le. In the present embodiment, the focus of the projector 1L is adjusted so that the image light GL for the left eye forms an image on the diffusion sheet 6.

  In the present embodiment, the diffusion sheet 6 has a larger diffusion angle in the vertical direction than in the horizontal direction (see FIG. 6). Therefore, as shown in FIG. 7C, the observable ranges Re1 and Le1 in which the observer M can observe the image in the vertical direction are both wider than in the horizontal direction. Note that the observable ranges Re1 and Le1 correspond to ranges in which the light beams GR1 and GL1 are condensed in the vertical direction, respectively.

  Therefore, when the observer M is at an observation position where the right eye overlaps at least a part of the vertically columnar range formed by overlapping the observable range Re and the observable range Re1, the screen 10 The right-eye image light GR projected onto the right-eye image G1 can be observed as the right-eye image G1.

  In addition, when the observer M is at an observation position where the left eye overlaps at least a part of a vertically columnar range formed by overlapping the observable range Le and the observable range Le1, the screen 10 The left eye image light GL projected on the left eye can be observed as the left eye image G2.

  In the present embodiment, since the right-eye image G1 and the left-eye image G2 have parallax, the observer M can observe a stereoscopic image with the naked eye.

  By the way, while observing a stereoscopic image, for example, if the observation position of the observer M deviates from a predetermined position, the stereoscopic image may not be visible.

  On the other hand, in the image display device 100 of the present embodiment, the position detection unit 12 detects the observation position of the observer M. And the control apparatus 15 moves the screen 10 based on the information regarding the observation position of the observer M so that the position of the eye of the observer M is within the observable range, as will be described later.

  Hereinafter, the relationship between the movement of the screen 10 and the change in the observation range of the observer M will be described with reference to FIG. Note that FIG. 8 will be described using the image light GL for the left eye as an example. That is, FIG. 8 corresponds to the plan view of FIG. 7B.

  As shown in FIG. 8, when the screen 10 is moved in the arrow direction, the center position of the Fresnel lens 5 is also moved in the same direction. The observable range Le is located on a straight line passing through the center line of the image light GL for the left eye and the center of the Fresnel lens 5. Therefore, when the Fresnel lens 5 moves together with the screen 10 as described above, the observable range Le also moves in the same direction as the screen 10.

  The moving distance D1 of the observable range Le is determined by a ratio of the sum of the distance from the projector 1L to the screen 10 and the distance from the projector 1L to the screen 10 and the distance from the screen 10 to the observer M. That is, when the two distances are substantially equal, the moving distance D2 of the screen 10 is about half (1/2 times) the moving distance D1 of the observable range Re. In other words, the drive unit 11 can move the observable range Le by a large distance (double distance) by moving the screen 10 by a small distance.

  In the present embodiment, the control device 15 acquires the observation position (eye position) of the observer M in the left-right direction based on the transmission result from the position detection unit 12. And the control apparatus 15 moves the screen 10 by the drive part 11 so that the observer M's eyes may overlap with the observation possible range Re.

  Since the same applies to the right-eye image G1 that can be seen by the right eye of the observer M, the description thereof is omitted.

As described above, according to the image display apparatus 100 of the present embodiment, the screen 10 is appropriately moved in the left-right direction even when the observation position of the observer M is shifted in the left-right direction from a predetermined position. Thus, the eyes of the observer M can be positioned within the observable range.
Therefore, the observer M can observe the stereoscopic image stably even when the observation position is shifted.
In addition, when the observation position is deviated, the observer M automatically moves the position of the observable range following the deviation of the observation position, so that it takes time and effort to find and move the position where the image can be observed. Since there is no, a stereoscopic image can be observed comfortably.

  The observation position of the observer M may be shifted in the vertical direction. In the present embodiment, the right-eye image observable range has a prismatic shape that is long in the vertical direction. Therefore, the image display apparatus 100 according to the present embodiment allows the observer to observe a stereoscopic image without moving the screen 10 in the vertical direction even when the observation position of the observer M is shifted to some extent in the vertical direction. be able to.

  Note that when the observation position of the observer M is greatly displaced in the vertical direction (when the observer's eyes are out of the observable range), the observer M moves the screen 10 in the vertical direction by the drive unit 11. The observable range may be moved to the eye position.

(Second Embodiment)
Next, an image display apparatus according to the second embodiment will be described. The difference between this embodiment and 1st Embodiment is the structure of a screen. In addition, about the structure which is common in 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  FIG. 9 is a cross-sectional view showing the configuration of the screen 20 of the present embodiment. FIG. 9 corresponds to a cross section passing through the central axis of the screen 20. As shown in FIG. 9, the screen 20 includes a linear Fresnel lens (light condensing unit) 5 </ b> A and a diffusion sheet 6 from the incident light incident direction.

  The linear Fresnel lens 5A and the diffusion sheet 6 are integrally held via a frame member (not shown). That is, the screen 20 of this embodiment has a linear Fresnel lens 5A instead of the Fresnel lens.

  FIG. 10 is a front view of the linear Fresnel lens 5A viewed from the light incident direction and a cross-sectional view showing a cross section passing through the central axis of the linear Fresnel lens 5A. As shown in FIG. 10, the cross section in the left-right direction of the linear Fresnel lens 5A has the same shape (step shape) as the Fresnel lens 5 of the first embodiment, and has a planar shape in the up-down direction. That is, the linear Fresnel lens 5A has a light collecting function in the left-right direction, but transmits light without having a light collecting function in the up-down direction.

  Also in this embodiment, the diffusion sheet 6 has a linear diffusion coefficient 5A with respect to the linear Fresnel lens 5A so that the light diffusion angle in the step direction (left-right direction) is smaller than the light diffusion angle in the vertical direction intersecting the step direction. Arranged. In the present embodiment, the drive unit 11 can move at least the linear Fresnel lens 5A in the step direction (left-right direction).

  In the present embodiment, the linear Fresnel lens 5A is disposed on the light incident surface side with respect to the diffusion sheet 6, but the linear Fresnel lens 5A may be disposed on the light exit surface side. That is, as the screen 20, a structure in which the positions of the linear Fresnel lens 5A and the diffusion sheet 6 are reversed left and right can be employed.

  Since the linear Fresnel lens 5A does not have a step shape in the vertical direction as described above, it has a planar shape in the vertical direction. Therefore, the linear Fresnel lens 5A regularly reflects external light from a ceiling lighting device or the like in the vertical direction. Therefore, in the screen 20 having the linear Fresnel lens 5A, the visibility is hardly lowered due to the influence of the reflected light by the external light.

Next, how the observer M sees the image when using the screen 20 of the present embodiment will be described.
The left and right diffusion characteristics of the screen 20 are the same as those of the screen 10 of the first embodiment. Therefore, in the left-right direction, the observable range Re where the right-eye image G1 can be seen and the observable range Le where the left-eye image G2 can be seen have the same shape. Therefore, the right eye image G1 and the left eye image G2 viewed by the observer M when the observation position moves in the left-right direction are the same (see FIGS. 7A and 7B).

  On the other hand, in the present embodiment, the light condensing function by the linear Fresnel lens 5A does not work in the vertical direction of the screen 20, so that light is basically transmitted without being condensed. Therefore, in the vertical direction, the observable ranges Re2 and Le2 as shown in FIG. 11 are formed by the light rays GR1 constituting the right eye image light GR and the light rays GL1 constituting the left eye image light GL.

  That is, the size of the observable ranges Re <b> 2 and Le <b> 2 increases according to the size of the diffusion angle in the vertical direction of the diffusion sheet 6. Therefore, it is desirable that the diffusion sheet 6 of the present embodiment has a larger diffusion angle than that used in the screen 10 of the first embodiment.

  Even when the screen 20 of the present embodiment is used, even when the observation position of the observer M is shifted in the left-right direction from a predetermined position, the screen 20 is appropriately set in the left-right direction as in the first embodiment. The eye of the observer M can be positioned in the observable range by moving to. Therefore, the observer M can observe the stereoscopic image stably even when the observation position is shifted.

(Third embodiment)
Subsequently, an image display apparatus according to a third embodiment will be described. The difference between this embodiment and 1st Embodiment is the structure of a screen. Specifically, the screen of the present embodiment has a diffusion sheet having different diffusion characteristics from the screen 10 of the first embodiment. In addition, about the structure which is common in 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The screen of the present embodiment has a Fresnel lens and a diffusion sheet, like the screen of the first embodiment. That is, the basic configuration of the screen of the present embodiment is the same as the screen 10 of the first embodiment.

  FIG. 12 is a diagram showing the diffusion characteristics of the diffusion sheet used in the screen of this embodiment. In FIG. 12, the horizontal axis represents the emission angle based on the incident angle, and the vertical axis represents the transmission characteristics. That is, it corresponds to FIG.

  As shown in FIG. 12, the diffusion sheet of the present embodiment has substantially the same diffusion angle in the horizontal direction (first direction) and the vertical direction (second direction). That is, the light diffusion characteristics of the diffusion sheet of this embodiment are isotropic.

  In the screen of this embodiment having such an isotropic diffusion characteristic, the size of the observable range in the vertical direction becomes as narrow as the observable range in the horizontal direction (see FIGS. 7A and 7B). Therefore, in the present embodiment, the screen is added in the left-right direction by the drive unit 11 and can be moved in the up-down direction.

  In the present embodiment, the ultrasonic sensor constituting the position detection unit 12 described in the first embodiment is also installed at the lower part of the screen. Thereby, in addition to the left-right direction, the position of the observer's head in the up-down direction, specifically, the position of the observer's eye (viewpoint) can be detected.

  According to the present embodiment, the eyes of the observer M can be positioned in the observable range even when the observation position of the observer M is deviated from a predetermined position in any of the vertical and horizontal directions. Therefore, the observer can observe the stereoscopic image stably without worrying about the shift of the observation position in any of the upper, lower, left and right directions.

  Furthermore, according to the configuration of the present embodiment, the light (right-eye image light GR and left-eye image light GL) projected from the projectors 1R and 1L around the eyes of the observer M is condensed, so that the projector 1R, High light utilization efficiency can be realized by efficiently using the light emitted from 1L. Therefore, since the light output of the projectors 1R and 1L can be suppressed, the power saving of the entire image display apparatus can be achieved.

(Fourth embodiment)
Subsequently, an image display apparatus according to a fourth embodiment will be described. The difference between this embodiment and 1st Embodiment is the structure of a screen. In addition, the same code | symbol is attached | subjected about the same structure as the said embodiment, and detailed description is abbreviate | omitted.

  FIG. 13 is a diagram showing a schematic configuration of the image display apparatus 101 of the present embodiment. As illustrated in FIG. 13, the image display apparatus 101 includes a projector 1 </ b> R, a projector 1 </ b> L, a screen 30, a drive unit 11, a position detection unit 12, and a control device 15.

  Since the screen 30 of the present embodiment is a reflection type screen, the observer M faces the screen 30 and observes an image directly below the projectors 1R and 1L. That is, in this embodiment, the direction in which the screen 30 is observed is opposite to that of the transmissive screen 10 shown in the first embodiment. Therefore, the arrangement of the projectors 1R and 1L with respect to the screen 30 is reversed.

  Moreover, in this embodiment, since the projection image of each projector 1R, 1L is also reflected, the right and left are reversed. Therefore, it is necessary to reverse the left and right of the image signal input to each projector 1R, 1L. Such a method of inverting the left and right of the image signal can be handled by using a conventionally known inverting function built in the projectors 1R and 1L.

  Specifically, the projector 1 </ b> R is positioned on the left side with respect to the center of the screen 30 when the light incident surface of the screen 30 is viewed in plan. The projector 1L is located on the right side with respect to the center of the screen 30 when the light incident surface of the screen 10 is viewed in plan.

  FIG. 14 is a cross-sectional view showing the configuration of the screen 30 of the present embodiment. FIG. 14 corresponds to a cross section passing through the central axis of the screen 30. As shown in FIG. 14, the screen 30 includes a Fresnel lens 5, a diffusion sheet 6, and a reflection mirror (reflection member) 7 from the incident light incident direction.

  The Fresnel lens 5, the diffusion sheet 6, and the reflection mirror 7 are integrally held via a frame member (not shown). That is, the screen 30 of the present embodiment has the same configuration as the screen 10 of the first embodiment except that the screen 30 includes the reflection mirror 7.

  The reflection mirror 7 is a flat surface that reflects visible light, and is formed, for example, by depositing a reflection film on the surface of glass. The screen 30 of the present embodiment includes the reflection mirror 7 and functions as a front screen that reflects the projection light (right eye image light GR and left eye image light GL) from the projectors 1R and 1L.

  In the present embodiment, the screen 30 is movable at least in the left-right direction by the drive unit 11. The drive unit 11 moves the screen 30 based on the detection result of the position detection unit 12 as in the first embodiment.

Next, how the image is viewed by the observer M in the present embodiment will be described.
FIG. 15A is a plan view conceptually illustrating how the right-eye image is viewed by the observer M, and FIG. 15B is a plan view conceptually illustrating how the left-eye image is viewed by the observer M. FIG. 15C is a side view conceptually illustrating how the viewer M looks in the vertical direction. That is, FIGS. 15A, 15B, and 15C correspond to FIGS. 7A, 7B, and 7C, respectively.

  As shown in FIG. 15A, when the image light GR for the right eye projected from the projector 1R is reflected by the screen 30, it is diffused by passing through the diffusion sheet 6 and condensed at a predetermined position by the Fresnel lens 5. The 15A-C, as in FIGS. 7A-7C, the right-eye image light GR and the left-eye image light GL are shown only for the central ray and the right and left rays for easy understanding of the drawing. The light beams GR1 and GL1 are shown by alternate long and short dash lines.

  As shown in FIG. 15A, since the image light GR for the right eye reflected by the screen 30 is diffused, each light ray GR1 constituting the image light for the right eye GR is not a single point, but in the observable range Re in the left-right direction. Condensate.

As shown in FIG. 15B, each light beam GL1 constituting the left-eye image light GL reflected by the screen 30 is condensed in the observable range Le in the left-right direction.
As shown in FIG. 15C, each light ray GR1 constituting the right eye image light GR is condensed in the observable range Re3 in the vertical direction, and each light ray GL1 constituting the left eye image light GL is in the vertical direction. The light is focused on the observable range Le3.

  In this embodiment, since the light reflected by the screen 30 is transmitted through the diffusion sheet 6 twice, the diffusion angle is different from that of the transmission type screen 10 that transmits the diffusion sheet 6 only once. If the angle is adjusted, the above-described observable ranges Re3 and Le3 can be set to the same size as the observable ranges Re1 and Le1 of the first embodiment even with the reflective screen 30.

  Here, the relationship between the movement of the screen 30 and the change in the observation range of the observer M will be described with reference to FIG. FIG. 16 will be described using the right-eye image light GR as an example.

  As shown in FIG. 16, when the screen 30 is moved in the direction indicated by the arrow, the center position of the Fresnel lens 5 is also moved in the same direction, so that the observable range Re of the right-eye image light GR is also in the same direction as the screen 10. Moving.

  The relationship between the observable range Re and the movement distance of the screen 30 is the same as that of the transmissive screen 10. That is, the moving distance D2 of the screen 30 is about half (1/2 times) the moving distance D1 of the observable range Re. In other words, the drive unit 11 can move the observable range Re by a large distance (double distance) by moving the screen 30 by a small distance.

  According to the image display apparatus 101 of the present embodiment, even when the observation position of the observer M is shifted from the predetermined position in the left-right direction, the reflective screen 30 is moved in the left-right direction, so that the first implementation is performed. Similar to the form, the eyes of the observer M can be positioned within the observable range. Therefore, the observer M can observe the stereoscopic image stably even when the observation position is shifted.

  Further, in this embodiment, since the reflective screen 30 is used, the observer M and the projectors 1R and 1L are on the same side with respect to the screen 30. Therefore, the space is smaller than when a transmissive screen is used. The image display device 101 can be used.

(Fifth embodiment)
Subsequently, an image display apparatus according to a fifth embodiment will be described. In addition, the same code | symbol is attached | subjected about the same structure as the said embodiment, and detailed description is abbreviate | omitted.

  FIG. 17 is a diagram showing a schematic configuration of the image display apparatus 102 of the present embodiment. As shown in FIG. 17, the image display device 101 of the present embodiment includes a projector 1R, a projector 1L, a screen 30, a drive unit 11, a position detection unit 16, a control device 17, a half mirror 18, Imaging devices 19 a and 19 b and a housing 25 are provided. The housing 25 accommodates the projector 1R, the projector 1L, the screen 10, the drive unit 11, the position detection unit 16, and the half mirror 18.

  In the present embodiment, the position detection unit 16 is attached to the housing 25. For example, the position detection unit 16 includes two ultrasonic sensors installed at the left and right ends of the housing 25, and the position of the head of the observer M in the left-right direction, specifically, the observer's eyes (viewpoint). ) Position can be detected. The position detection unit 16 is electrically connected to the control device 17 and transmits a detection result to the control device 17.

  The control device 17 controls driving of each component of the image display device 102. That is, the control device 17 controls the projectors 1R and 1L and the drive unit 11. In the present embodiment, the control device 17 controls the position of the screen 30 by the drive unit 11 based on the result transmitted from the position detection unit 16.

  The projector 1R, the projector 1L, and the screen 30 are in the same positional relationship as the image display device 100 of the first embodiment. In the present embodiment, the projector 1R and the projector 1L are located below the screen 30, and are arranged to project the right eye image light GR and the left eye image light GL from below to above.

  In the present embodiment, the half mirror 18 is arranged in the middle of the path of the right eye image light GR and the left eye image light GL projected from the projector 1R and the projector 1L toward the screen 30.

  In the present embodiment, the observer M observes an image at a position facing the half mirror 18. The imaging devices 19a and 19b are composed of, for example, a CCD camera. The imaging devices 19a and 19b and the observer M are arranged in a relationship similar to the arrangement of the projectors 1R and 1L and the screen 30 (see FIG. 13) in the fourth embodiment, and each camera has its optical axis horizontal. The observer M is imaged from different directions via the half mirror 18. Therefore, the captured image by the imaging device 19a and the captured image by the imaging device 19b are images corresponding to the binocular parallax.

  The imaging devices 19 a and 19 b are electrically connected to the control device 17. The control device 17 converts image data transmitted from the imaging devices 19a and 19b (each CCD camera) into an image signal, and transmits the image signal to the projectors 1R and 1L, respectively.

  In the present embodiment, the projector 1R projects the right eye image light GR toward the screen 30 based on the image signal transmitted from the control device 17 (the image captured by the imaging device 19a). Further, the projector 1L projects the image light GL for the left eye toward the screen 30 based on the image signal transmitted from the control device 17 (the captured image by the imaging device 19b). In the present embodiment, the right eye image light GR and the left eye image light GL pass through the half mirror 18 and enter the screen 30.

  The right eye image light GR and the left eye image light GL reflected by the screen 30 are reflected by the half mirror 18 toward the observer M. In the present embodiment, since the right-eye image light GR and the left-eye image light GL correspond to the binocular parallax, a stereoscopic image Z is generated on the screen 30. Therefore, the observer M observes the three-dimensional virtual image Z1 through the half mirror 18.

  Note that the three-dimensional virtual image Z1 may be one in which the left-right direction is reversed so as to look at a normal mirror. Alternatively, the three-dimensional virtual image Z1 may be one that does not reverse the left-right direction as seen by others. Such a method for determining the left-right direction can be handled by existing techniques such as left-right reversal of the projectors 1R, 1L.

  According to the image display apparatus 102 of this embodiment, the observer M always moves his / her face without worrying about the observation position by automatically following the position of the observer M and moving the observable range. Can be observed three-dimensionally.

  In the present embodiment, the position of the observer M is acquired using the position detection unit 16, but the position of the observer M may be detected from images taken by the imaging devices 19a and 19b. In this way, the position detection unit 16 is not necessary, and thus the cost of the image display apparatus 101 can be reduced by reducing the number of parts.

  The image display apparatus 102 of the present embodiment can also be used as a bidirectional communication unit by installing another image display apparatus at a remote location, for example. For example, the output signals of the imaging devices 19a and 19b of the image display device 101 installed at the first location are transmitted as input signals to the projectors 1R and 1L of the image display device 101 installed at the second location, and the second What is necessary is just to connect so that the output signal of the imaging devices 19a and 19b of the image display apparatus 101 installed in the first location may be transmitted as an input signal to the projectors 1R and 1L of the image display apparatus 101 installed in the first location.

  In this way, a three-dimensional bidirectional communication environment can be constructed. Even in this case, since the observable range moves following the observer M, the observer M can visually recognize the face of the other party in a remote place without paying attention to the seating position. It is possible to perform comfortable and realistic bidirectional communication.

In the present embodiment, the positions of the screen 30 and the imaging devices 19a and 19b with respect to the half mirror 18 may be interchanged.
In this case, the image light GR for the right eye and the image light GL for the left eye projected from the projectors 1R and 1L are reflected by the half mirror 18 and projected onto the screen 30. The image light GR for the right eye and the image light GL for the left eye reflected by the screen 30 pass through the half mirror 18 toward the observer M. The imaging devices 19a and 19b capture the image of the observer M reflected by the half mirror 18.
According to this configuration, since the surface of the screen 30 is arranged along the vertical direction, the holding structure of the screen 30 can be simplified as compared with the case where the screen 30 is held horizontally as shown in FIG.

  In addition, this invention is not limited to the content of the said embodiment, In the range which does not deviate from the main point of invention, it can change suitably.

  For example, in the first embodiment, the case where the screen 10 is composed of one Fresnel lens 5 and the diffusion sheet 6 is taken as an example, but a configuration in which the diffusion sheet 6 is sandwiched between the two Fresnel lenses 5 is adopted. You may do it. In the case of this configuration, when two identical Fresnel lenses are stacked, the focal length becomes about ½ of the focal length of the single Fresnel lens (configuration of the first embodiment).

  In the second embodiment, the case where the screen 10 is composed of one linear Fresnel lens 5A and the diffusion sheet 6 is taken as an example, but the configuration in which the diffusion sheet 6 is sandwiched between the two linear Fresnel lenses 5A. May be adopted.

  In the above-described embodiment, the case where the entire screen 10 is moved by the drive unit 11 has been described as an example. However, the present invention is not limited to this, and the drive unit 11 includes at least a Fresnel lens among the components of the screen 10. Any configuration that only moves 5 is acceptable.

  Moreover, although the case where the moving directions of the screens 10, 20, and 30 are moved in the left-right direction or the up-and-down direction has been described as an example in the above-described embodiment, the screens 10 and 20 are arranged along an oblique direction intersecting the left-and-right direction and the up-and-down direction. , 30 may be moved to move the observable range of the observer M. Further, when the observation position of the observer M moves in the front-rear direction, the observable range may be moved by moving the screens 10, 20, 30 in the front-rear direction (the thickness direction of the screen).

  DESCRIPTION OF SYMBOLS 1L ... Projector (2nd projector), 1R ... Projector (1st projector), 5 ... Fresnel lens (condensing part), 5A ... Linear Fresnel lens (condensing part), 6 ... Diffusion sheet (diffusion part), 7 ... Reflection mirror, 10, 20, 30 ... screen, 11 ... drive unit, 12, 16 ... position detection unit, 18 ... half mirror, 19a, 19b ... imaging device, 100, 101, 102 ... image display device, EL ... left eye ER ... right eye, GL ... left eye image light (second image light), GR ... right eye image light (first image light), M ... observer.

Claims (6)

A screen including a light collecting portion and a light diffusing portion arranged in a direction in which light passes;
A first projector for emitting first image light to the screen;
A second projector that emits second image light to the screen;
A detection unit for detecting the position of the observer;
A stereoscopic image display device comprising: a drive unit that moves at least the light collecting unit of the screen based on a detection result of the detection unit. The condensing part is a Fresnel lens;
In the light diffusion portion, the light diffusion angle in the first direction of the screen is smaller than the light diffusion angle in the second direction intersecting the first direction,
The stereoscopic image display apparatus according to claim 1, wherein the driving unit moves at least the light collecting unit in the first direction. The condensing part is a linear Fresnel lens;
The light diffusion portion has a light diffusion angle in a step direction of the linear Fresnel lens that is smaller than a light diffusion angle in a direction intersecting the step direction,
The stereoscopic image display apparatus according to claim 1, wherein the driving unit moves at least the light collecting unit in the step direction. The condensing part is a Fresnel lens;
The stereoscopic image display device according to claim 1, wherein a light diffusion characteristic of the light diffusion portion is isotropic. 5. The stereoscopic image display device according to claim 1, wherein the screen further includes a reflecting member that reflects light transmitted through the light collecting unit and the light diffusing unit. An image sensor for imaging the observer;
A half mirror that transmits or reflects the first image light and the second image light emitted from the first projector and the second projector to enter the screen; and
The first projector and the second projector project the first image light and the second image light corresponding to an image captured by the image sensor,
The stereoscopic image display device according to claim 5, wherein the half mirror reflects or transmits the first image light and the second image light reflected by the screen and guides them to the observer.

Images