JP7439764B2 - Video display device - Google Patents

Description

The present disclosure relates to a video display device that displays multiple viewpoint videos.

There is a technique for displaying a stereoscopic image by displaying a plurality of images viewed from different viewpoints (viewpoint images) on the same screen. For example, by arranging multiple projectors on the circumference, placing a screen that diffuses only in the vertical direction in the center, and projecting viewpoint images from each of the multiple projectors onto the screen at different angles, it is possible to There is a technology for displaying stereoscopic images (see Patent Document 1). In this case, components such as a drive circuit, a projection optical system, and a display element that constitute each projector are arranged on the circumference.

Japanese Patent Application Publication No. 2010-32952

In the above technology, the overall size of the video display device becomes large due to restrictions on the area occupied by the components of the plurality of projectors. Furthermore, the arrangement pitch between the plurality of projectors is determined by the size of each individual projector, and in terms of characteristics, the angular resolution, which is a factor that determines the display quality of stereoscopic images, is restricted.

It is desirable to provide a video display device capable of displaying multi-view video with high display quality over a wide range without increasing the size of the configuration.

An image display device according to an embodiment of the present disclosure includes a projection section, at least a portion of which is rotationally movable, that emits projection light forming at least one viewpoint image, and a condensing section that collects the projection light. a diffusion member that diffuses the projection light so that the projection light is relatively narrowly diffused in the horizontal direction and relatively widely diffused in the vertical direction; a detection unit that detects the viewer's viewpoint position; and at least one of the projection units. and a control unit that rotates the unit to a position corresponding to the viewpoint position detected by the detection unit.
In the video display device according to an embodiment of the present disclosure, the projection unit emits projection light including the detection marker, and the detection unit is capable of detecting the projected position of the detection marker and the position of the observer's eyes. The control unit rotates at least a portion of the projection unit based on the difference between the projection position of the detection marker and the position of the observer's eyes.
Further, an image display device according to an embodiment of the present disclosure includes a shape marker that rotates together with at least a portion of the projection section, and a detection section that detects a position of the shape marker with respect to an observer and a position of the observer's eyes. may be detected, and the control unit may rotate at least a portion of the projection unit based on the difference between the position of the shape marker with respect to the observer and the position of the observer's eyes.

In an image display device according to an embodiment of the present disclosure, projection light forming at least one viewpoint image is emitted from the projection unit, at least a portion of which is rotationally movable. The control section rotates at least a portion of the projection section to a position corresponding to the viewpoint position detected by the detection section.

FIG. 2 is a configuration diagram showing an outline of a video display device according to a comparative example. FIG. 1 is a top view schematically showing a configuration example of a video display device according to a first embodiment of the present disclosure. 1 is a side sectional view schematically showing an example of the configuration of a video display device according to a first embodiment; FIG. FIG. 2 is an explanatory diagram showing an example of an appropriate horizontal light diffusion distribution in the video display device according to the first embodiment. FIG. 2 is an explanatory diagram showing an example of characteristic parameters related to the relationship between observation distance and viewpoint position in the video display device according to the first embodiment. FIG. 7 is a characteristic diagram showing an example of the values of main characteristic parameters when the optimum observation position is changed in the video display device according to the first embodiment. FIG. 7 is a characteristic diagram showing an example of the values of main characteristic parameters when the horizontal diffusion angle is changed in the video display device according to the first embodiment. FIG. 7 is a top view schematically showing a main part of a configuration example of a video display device according to a second embodiment. FIG. 7 is an explanatory diagram showing an example of characteristic parameters related to the relationship between observation distance and viewpoint position in the video display device according to the second embodiment. FIG. 7 is a characteristic diagram showing an example of the relationship between the observation distance and the positions of the first and second projector modules in the video display device according to the second embodiment. FIG. 7 is a characteristic diagram showing an example of the relationship between the observation distance and the interval between the first and second projector modules in the video display device according to the second embodiment. FIG. 7 is a top view schematically showing a main part of a configuration example of a video display device according to a third embodiment. FIG. 7 is a side sectional view schematically showing a main part of a configuration example of a video display device according to a third embodiment. FIG. 7 is a characteristic diagram showing an example of the relationship between the observation distance and the lens position of the lens for adjusting the focusing position in the video display device according to the third embodiment. FIG. 7 is a configuration diagram schematically showing a main part of a configuration example of a video display device according to a fourth embodiment. FIG. 12 is an explanatory diagram schematically showing a viewing range by a video display device according to a fourth embodiment. FIG. 12 is a top view schematically showing main parts of a video display device according to a first configuration example of a fifth embodiment. FIG. 12 is a top view schematically showing main parts of a video display device according to a second configuration example of a fifth embodiment. FIG. 12 is a top view schematically showing main parts of a video display device according to a third configuration example of a fifth embodiment. FIG. 7 is a top view schematically showing a configuration example of a video display device according to a sixth embodiment. FIG. 12 is a cross-sectional view schematically showing a configuration example of a transmission type cylindrical screen in a video display device according to a sixth embodiment. FIG. 7 is a cross-sectional view schematically showing an equivalent configuration example of a transmission type cylindrical screen in a video display device according to a sixth embodiment. FIG. 7 is a top view schematically showing a configuration example of a video display device according to a seventh embodiment. FIG. 12 is a side sectional view schematically showing a configuration example of a video display device according to a seventh embodiment. FIG. 3 is a side sectional view schematically showing an example of the relationship between the projection elevation angle and the rotational movement direction of the projector module in the video display device according to the first embodiment. FIG. 12 is a side sectional view schematically showing an example of the relationship between the projection elevation angle and the rotational movement direction of the projector module in the video display device according to the seventh embodiment. FIG. 2 is an explanatory diagram showing an outline of an incident light vector and a reflected light vector on a reflective plane of a reflective flat screen. FIG. 2 is an explanatory diagram showing an outline of an incident light vector and a reflected light vector on a reflective plane of a reflective flat screen. FIG. 2 is an explanatory diagram showing an overview of incident light vectors and reflected light vectors on a reflective plane of a reflective flat screen. FIG. 12 is a top view schematically showing a configuration example of a video display device according to an eighth embodiment. FIG. 12 is a side sectional view schematically showing a configuration example of a video display device according to an eighth embodiment. FIG. 12 is a top view schematically showing a configuration example of a video display device according to a ninth embodiment. FIG. 12 is a side sectional view schematically showing a configuration example of a video display device according to a ninth embodiment. FIG. 12 is a top view schematically showing a configuration example of a video display device according to a tenth embodiment. FIG. 12 is a side sectional view schematically showing a configuration example of a video display device according to a tenth embodiment. FIG. 7 is an external view showing an outline of a video display device according to an eleventh embodiment. FIG. 12 is an external view schematically showing a main part of a configuration example of a video display device according to an eleventh embodiment. FIG. 7 is a side sectional view schematically showing a configuration example of a video display device according to an eleventh embodiment. FIG. 7 is a side sectional view schematically showing a first example of a projection state by a first projector unit in an image display device according to an eleventh embodiment. FIG. 12 is a side sectional view schematically showing a first example of a projection state by a second projector unit in the video display device according to the eleventh embodiment. FIG. 12 is a side sectional view schematically showing a second example of a projection state by the first projector unit in the video display device according to the eleventh embodiment. FIG. 12 is a side sectional view schematically showing a second example of a projection state by a second projector unit in the video display device according to the eleventh embodiment. FIG. 12 is an external view schematically showing a main part of a configuration example of a video display device according to an eleventh embodiment. FIG. 7 is a partial cross-sectional view schematically showing a main part of a configuration example of a video display device according to an eleventh embodiment. FIG. 12 is an exploded view schematically showing a main part of a configuration example of a video display device according to an eleventh embodiment. FIG. 12 is an external view schematically showing a main part of a configuration example of a video display device according to an eleventh embodiment. FIG. 12 is a plan view schematically showing a main part of a configuration example of a video display device according to an eleventh embodiment. FIG. 12 is an external view schematically showing a main part of a configuration example of a video display device according to an eleventh embodiment. FIG. 12 is an explanatory diagram schematically showing the arrangement of camera modules in a video display device according to an eleventh embodiment. FIG. 7 is an explanatory diagram schematically showing a first example of a method for detecting a viewpoint position in a video display device according to an eleventh embodiment. FIG. 12 is an explanatory diagram schematically showing a second example of a method for detecting a viewpoint position in a video display device according to an eleventh embodiment. FIG. 7 is a plan view schematically showing a first example of a linear drive mechanism of a projector unit in an image display device according to an eleventh embodiment. FIG. 7 is an external view schematically showing a first example of a linear drive mechanism of a projector unit in an image display device according to an eleventh embodiment. FIG. 2 is an explanatory diagram schematically showing an example of the driving principle of an ultrasonic motor. FIG. 3 is an explanatory diagram schematically showing the relationship between the driving voltage of the ultrasonic motor and the displacement of the movable part. FIG. 7 is a plan view schematically showing a second example of a linear drive mechanism of a projector unit in an image display device according to an eleventh embodiment. FIG. 2 is an explanatory diagram schematically showing an example of the driving principle of a stepping motor. FIG. 2 is an explanatory diagram schematically showing an example of the driving principle of a stepping motor. FIG. 7 is an external view showing an outline of a video display device according to a twelfth embodiment. FIG. 12 is an exploded view schematically showing a main part of a configuration example of a video display device according to a twelfth embodiment. FIG. 12 is a side sectional view schematically showing a main part of a configuration example of a video display device according to a twelfth embodiment. FIG. 12 is an explanatory diagram schematically showing a first example of a projection state by the video display device according to the twelfth embodiment. FIG. 12 is an explanatory diagram schematically showing a second example of a projection state by the video display device according to the twelfth embodiment. FIG. 12 is a configuration diagram schematically showing a first modification of the video display device according to the twelfth embodiment. FIG. 12 is a configuration diagram schematically showing a second modification example of the video display device according to the twelfth embodiment.

Embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the explanation will be given in the following order.
1. First embodiment 1.0 Comparative example (Figure 1)
1.1 Configuration and operation of the video display device according to the first embodiment (FIGS. 2 to 7)
1.2 Effect 2. Second embodiment (FIGS. 8 to 11)
3. Third embodiment (FIGS. 12 to 14)
4. Fourth embodiment (FIGS. 15 to 16)
5. Fifth embodiment (FIGS. 17 to 19)
6. Sixth embodiment (FIGS. 20 to 22)
7. Seventh embodiment (FIGS. 23 to 29)
8. Eighth embodiment (FIGS. 30 to 31)
9. Ninth embodiment (FIGS. 32 to 33)
10. Tenth embodiment (FIGS. 34 to 35)
11. Eleventh embodiment (FIGS. 36 to 58)
11.1 Overview 11.2 Viewpoint position detection method 11.3 Example of linear drive mechanism of projector unit (projection section) 12. Twelfth embodiment (FIGS. 59 to 65)
13. Other embodiments

<1. First embodiment>
[1.0 Comparative example]
(Overview and issues of video display device according to comparative example)
FIG. 1 shows an outline of a video display device according to a comparative example.

The video display device according to the comparative example includes a plurality of projectors 100 arranged in an array on the circumference, and a screen 200 having anisotropic diffusion characteristics arranged in the center. Each projector 100 projects an image toward the center to display a stereoscopic image.

One projector 100 is, for example, a DMD (Digital Micromirror Device) type MEMS (Micro Electro Mechanical System) projector that generates a projected image using a plurality of two-dimensionally arranged movable mirrors. In this case, one projector 100 displays a two-dimensional image on the screen 200 by two-dimensionally scanning a laser light source with a MEMS mirror. As a result, in the video display device according to the comparative example, video light for one viewpoint is emitted from one projector 100. Therefore, in order to display images from a plurality of viewpoints, projectors 100 corresponding to the number of viewpoints are required, resulting in a large-scale device as a whole. In the video display device according to the comparative example, the base point of each projector 100 is on the circumference, and even if each projector 100 is made smaller, it is difficult to reduce the size of the device as a whole.

[1.1 Configuration and operation of video display device according to first embodiment]
(Configuration of video display device)
FIG. 2 schematically shows a configuration example of the video display device 1 according to the first embodiment of the present disclosure, viewed from the top. FIG. 3 schematically shows a configuration example of a side cross section of the video display device 1. As shown in FIG. Note that in FIG. 2 and the like, the X axis indicates a horizontal direction, the Y axis indicates a vertical direction, and the Z axis indicates a direction perpendicular to the X and Y axes. The same applies to other figures showing the first embodiment and figures shown in other embodiments, which will be described later.

The video display device 1 includes a reflective cylindrical screen 2, a circular rail 3 disposed on the inner peripheral side with respect to the reflective cylindrical screen 2, and a first projector module Pj1 and a first projector module Pj1 disposed on the rail 3. 2 projector modules Pj2. The video display device 1 further includes a housing 10 (FIG. 3) that houses the rail 3, the first projector module Pj1, and the second projector module Pj2.

The video display device 1 further includes a viewpoint position detection section 11, a projector module position control section 12, and a video supply section 13.

In the first embodiment, the first projector module Pj1 and the second projector module Pj2 correspond to a specific example of a "projection unit" in the technology of the present disclosure. In the first embodiment, the reflective cylindrical screen 2 corresponds to a specific example of a "diffusion member" in the technology of the present disclosure.

In the first embodiment, the viewpoint position detection unit 11 corresponds to a specific example of a “detection unit” in the technology of the present disclosure. In the first embodiment, the projector module position control section 12 corresponds to a specific example of a "control section" in the technology of the present disclosure.

The viewpoint position detection unit 11 detects the viewpoint positions (left eye 4L and right eye 4R) of the observer. The viewpoint position detection unit 11 includes, for example, a camera module, and detects at least the horizontal viewpoint position of the observer.

The projector module position control section 12 rotates the first and second projector modules Pj1 and Pj2 to positions according to the viewpoint position detected by the viewpoint position detection section 11.

The first and second projector modules Pj1 and Pj2 as a whole constitute a "projection unit" in the technology of the present disclosure. For example, the first and second projector modules Pj1 and Pj2 are rotatably movable as a whole on a rail 3. The central axis of the circular rail 3 substantially coincides with the central axis C1 of the reflective cylindrical screen 2. Note that in the rotational movement direction, the first and second projector modules Pj1 and Pj2 are fixed to the rail 3 and the rail 3 itself is rotated, thereby rotating the first and second projector modules Pj1 and Pj2. You may also do so. The circular rail 3 has a hollow center of rotation where wiring can be placed. The wiring here includes, for example, electrical wiring and optical communication wiring connected to the first and second projector modules Pj1 and Pj2. In the first embodiment, the circular rail 3 corresponds to a specific example of the "rotation drive mechanism section" in the technology of the present disclosure.

The first and second projector modules Pj1 and Pj2 each include, for example, a laser light source and a light modulation element that modulates light from the laser light source. The first and second projector modules Pj1 and Pj2 can each be configured with, for example, an LCOS (Liquid Crystal On Silicon) type projector, a DMD type MEMS projector, a single mirror type MEMS projector, or the like.

The first and second projector modules Pj1 and Pj2 each emit projection light forming at least one viewpoint image. For example, the first projector module Pj1 emits first projection light Lpj1 that forms a viewpoint image for the left eye 4L. Further, for example, the second projector module Pj2 emits second projection light Lpj2 that forms a viewpoint image for the right eye 4R.

The video supply unit 13 supplies video signals corresponding to viewpoint videos for the left eye 4L and the right eye 4R to each of the first and second projector modules Pj1 and Pj2.

The reflective cylindrical screen 2 is a diffusion member that has anisotropic diffusion characteristics in which light diffusion characteristics are different in the horizontal direction and the vertical direction. The reflective cylindrical screen 2 has a cylindrical reflective surface on its inner peripheral surface. The cylindrical reflective surface of the reflective cylindrical screen 2 acts as a condenser that condenses the first and second projection lights Lpj1 and Lpj2. The reflective cylindrical screen 2 is composed of, for example, a reflective holographic optical element (HOE). The reflective cylindrical screen 2 focuses the first and second projection lights Lpj1 and Lpj2 toward the viewer's viewpoint position on the cylindrical reflective surface, while relatively narrowly diffusing them in the horizontal direction and relatively narrowly diffusing them in the vertical direction. It spreads in such a way that it spreads widely.

In the first embodiment, the cylindrical reflective surface of the reflective cylindrical screen 2 corresponds to a specific example of a "light condensing section" in the technology of the present disclosure.

(Operation of video display device)
In the video display device 1, the first projector module Pj1 projects the first projection light Lpj1 toward a cylindrical reflective surface formed on the inner peripheral surface of the reflective cylindrical screen 2. Further, the second projector module Pj2 projects the second projection light Lpj2 toward the cylindrical reflective surface of the reflective cylindrical screen 2 at a position different from that of the first projection light Lpj1. The first projection light Lpj1 is focused and diffused by the reflective cylindrical screen 2, thereby being distributed in a diffused manner in the first projection area Ar1. Further, the second projection light Lpj2 is concentrated and diffused by the reflective cylindrical screen 2, thereby being distributed in a diffused manner in the second projection area Ar2.

On the other hand, the rotational movement positions of the first and second projector modules Pj1 and Pj2 are controlled by the projector module position control section 12 so that they are at appropriate positions according to the viewpoint position detected by the viewpoint position detection section 11. Rotate and move on rail 3. The first and second projector modules Pj1 and Pj2 rotate about the same axis as the central axis C1 of the reflective cylindrical screen 2. The rotation angles of the first and second projector modules Pj1 and Pj2 are determined so that the condensing positions of the first and second projection lights Lpj1 and Lpj2 substantially match the positions of the left eye 4L and the right eye 4R. . Thereby, the first projection light Lpj1 is focused toward, for example, the left eye 4L. The second projection light Lpj2 is focused toward the right eye 4R, for example. It is preferable that the first and second projector modules Pj1 and Pj2 rotate and move on a plane such that the projection elevation angle θ with respect to the cylindrical reflective surface of the reflective cylindrical screen 2 is constant, as shown in FIG. 25 described later. .

(About the diffusion characteristics of reflective cylindrical screen 2)
FIG. 4 shows an example of an appropriate horizontal light diffusion distribution in the video display device 1.

In the left eye 4L and right eye 4R , the reflective cylindrical screen 2 uses the first and second projection lights Lpj1 from the first and second projector modules Pj1 and Pj2 so that the respective viewpoint images do not mix together. , Lpj2 are preferably diffused horizontally at an appropriate angle. For example, as shown in FIG. 4, the reflective cylindrical screen 2 preferably diffuses the first and second projection lights Lpj1 and Lpj2 so as to have a nearly rectangular diffusion distribution in the horizontal direction. By giving the reflective cylindrical screen 2 a diffusion distribution characteristic that provides a relatively narrow angle in the horizontal direction (X direction in FIG. 4), it is possible to prevent crosstalk caused by mixing left and right viewpoint images. . In addition, by providing the reflective cylindrical screen 2 with a diffusion distribution characteristic that provides a wider angle in the vertical direction (Y direction in Fig. 4) than in the horizontal direction, viewpoint images can be observed at a wider angle in the vertical direction. It becomes possible to do so.

(About the optimal observation position)
In the video display device 1, the cylindrical reflective surface of the reflective cylindrical screen 2 has a lens function as a light condensing section, and its focal point is at a position half the radius of the cylindrical reflective surface. The first and second projector modules Pj1 and Pj2 are arranged, for example, at positions slightly shifted toward the center axis C1 from a position that is 1/2 of the radius of the cylindrical reflective surface. The optimal observation position of the video display device 1 is determined by the positions of the first and second projector modules Pj1 and Pj2.

FIG. 5 shows an example of characteristic parameters regarding the relationship between observation distance and viewpoint position in the video display device 1. In FIG. 5, the meanings of each symbol are as follows.
Lcmax: Crosstalk allowable limit distance Lmax: Maximum allowable image loss distance Lmin: Minimum allowable image loss distance Lop: Optimal observation distance θconv: Ray angle between viewpoints θfov: Field of View (FOV)
θd: Horizontal diffusion angle

FIG. 6 shows the main characteristic parameters (crosstalk permissible limit distance Lcmax, maximum permissible image loss distance Lmax, and minimum permissible image loss distance Lmin) when the optimal observation distance Lop (optimum observation position) is changed in the video display device 1. ) shows an example of the value. Further, FIG. 7 shows an example of values of similar main characteristic parameters when the horizontal diffusion angle is changed in the video display device 1.

6 and 7 show values when the horizontal display size of the viewpoint video is 100 mm and the interocular distance is 65 mm. Further, FIG. 6 shows values when the horizontal diffusion angle θd is 3°.

As shown in FIGS. 5 and 6, the distance range in which image loss does not occur when changing the optimal observation position is the distance range between the maximum allowable image loss distance Lmax and the minimum allowable image loss distance Lmin (Lmax- Lmin). Further, a distance range that is less than or equal to the crosstalk allowable limit distance Lcmax is a distance range in which crosstalk does not occur. The values of each characteristic parameter shown in FIGS. 5 to 7 are determined depending on usage conditions.

[1.2 Effect]
As explained above, according to the video display device 1 according to the first embodiment, two viewpoints, left and right, are provided from the rotationally movable projection unit (first and second projector modules Pj1, Pj2). Since the projection light that forms the image is emitted and the projection unit is rotated to a position according to the viewpoint position, it is possible to display high-quality 3D images over a wide range without increasing the size of the configuration. It becomes possible.

Note that the effects described in this specification are merely examples and are not limiting, and other effects may also exist. The same applies to the effects of other embodiments described below.

<2. Second embodiment>
Next, a video display device according to a second embodiment of the present disclosure will be described. Note that, hereinafter, components that are substantially the same as those of the video display device according to the first embodiment will be denoted by the same reference numerals, and descriptions thereof will be omitted as appropriate.

FIG. 8 schematically shows a main part of a configuration example of a video display device 1A according to the second embodiment when viewed from the top direction.

In the video display device 1 according to the first embodiment, the first and second projector modules Pj1 and Pj2 are fixed in a direction (observation distance direction) orthogonal to the rotational movement direction. Furthermore, the interval between the first and second projector modules Pj1 and Pj2 is fixed to a constant value.

On the other hand, in the video display device 1A according to the second embodiment, the first and second projector modules Pj1 and Pj2 are arranged in the direction orthogonal to the rotational movement direction. The position Zpj of Pj1 and Pj2 is variable. Further, the interval Xpj between the first and second projector modules Pj1 and Pj2 in the horizontal direction is variable. Thereby, in the video display device 1A, the respective emission positions of the first and second projection lights Lpj1 and Lpj2 from the first and second projector modules Pj1 and Pj2 can be adjusted. Thereby, the respective condensing positions (focus positions) of the first and second projection lights Lpj1 and Lpj2 can be adjusted.

In the video display device 1A according to the second embodiment, the viewpoint position detection unit 11 detects, for example, the viewpoint position of the observer in the observation distance direction in addition to the horizontal direction. The projector module position control unit 12 rotates the first and second projector modules Pj1 and Pj2 to positions corresponding to the horizontal viewpoint position detected by the viewpoint position detection unit 11, and also changes the viewpoint position in the observation distance direction. The first and second projector modules Pj1 and Pj2 are moved to positions according to the following. Thereby, the projector module position control unit 12 determines that the respective condensing positions of the first and second projection lights Lpj1 and Lpj2 correspond to the viewpoint position in the observation distance direction detected by the viewpoint position detection unit 11. The positions Zpj and the distances Xpj of the first and second projector modules Pj1 and Pj2 are controlled so that the distances Xpj and .

FIG. 9 shows an example of characteristic parameters regarding the relationship between observation distance Lo (observation position) and viewpoint position in the video display device 1A. In FIG. 9, parts having the same meaning as in FIG. 5 are given the same symbols. FIG. 10 shows an example of the relationship between the observation distance Lo and the positions Zpj of the first and second projector modules Pj1 and Pj2 in the video display device 1A. FIG. 11 shows an example of the relationship between the observation distance Lo in the video display device 1A and the interval Xpj between the first and second projector modules Pj1 and Pj2. As shown in FIG. 8, the value of the position Zpj in FIG. It is assumed that the value is "-100" and the value changes in the + direction as the distance from the rotation center axis increases.

In the video display device 1 according to the first embodiment, as shown in FIG. 5, the optimum observation distance Lop is fixed to a constant value, and the distance at which comfortable observation can be made around the optimum observation position is limited. . On the other hand, in the video display device 1A according to the second embodiment, by optimizing the position Zpj and the interval Xpj of the first and second projector modules Pj1 and Pj2 according to the viewpoint position in the observation distance direction, It becomes possible to observe comfortably over a wide range not only in the horizontal direction but also in the observation distance direction.

Other configurations, operations, and effects may be substantially the same as those of the video display device 1 according to the first embodiment.

<3. Third embodiment>
Next, a video display device according to a third embodiment of the present disclosure will be described. Note that, hereinafter, parts that are substantially the same as the components of the video display device according to the first or second embodiment will be denoted by the same reference numerals, and the description will be omitted as appropriate.

FIG. 12 schematically shows a main part of a configuration example of a video display device 1B according to the third embodiment when viewed from the top direction. FIG. 13 schematically shows a main part of a configuration example of a side cross section of the video display device 1B.

In the video display device 1A according to the second embodiment, by making the position Zpj and the interval Xpj of the first and second projector modules Pj1 and Pj2 variable, the first and second projection lights Lpj1 and Lpj2 The respective light collection positions (focus positions) can be adjusted.

On the other hand, the video display device 1B according to the third embodiment includes a focusing position adjustment lens 21 for adjusting the focusing positions of the first and second projection lights Lpj1 and Lpj2. ing. In the video display device 1B, similarly to the video display device 1 according to the first embodiment, the first and second projector modules Pj1 and Pj2 are arranged in the direction perpendicular to the rotational movement direction (observation distance direction). It may be fixed. Further, in the video display device 1B, similarly to the video display device 1 according to the first embodiment, the interval between the first and second projector modules Pj1 and Pj2 may be fixed to a constant value.

In the third embodiment, the first projector module Pj1, the second projector module Pj2, and the light collection position adjustment lens 21 correspond to a specific example of the "projection unit" in the technology of the present disclosure.

The light collection position adjustment lens 21 is located between the cylindrical reflective surface of the reflective cylindrical screen 2 and the first and second projector modules Pj1 and Pj2, and adjusts the light emitted from the first and second projector modules Pj1 and Pj2. It is arranged on the optical path of the first and second projection lights Lpj1 and Lpj2. The focusing position adjustment lens 21 is movable in a direction perpendicular to the rotational movement direction of the first and second projector modules Pj1 and Pj2. This makes it possible to adjust the respective focusing positions of the first and second projection lights Lpj1 and Lpj2. Although FIG. 12 shows an example of a configuration in which the lens 21 for adjusting the focusing position is a concave lens, a configuration in which the lens 21 for adjusting the focusing position is a convex lens is also possible.

In the video display device 1B according to the third embodiment, the viewpoint position detection unit 11 detects, for example, the viewpoint position of the observer in the observation distance direction in addition to the horizontal direction. The projector module position control unit 12 rotates the first and second projector modules Pj1 and Pj2 to positions corresponding to the horizontal viewpoint position detected by the viewpoint position detection unit 11, and also changes the viewpoint position in the observation distance direction. The lens 21 for adjusting the focusing position is moved to a position corresponding to the position. As a result, the projector module position control unit 12 determines that the respective condensing positions of the first and second projection lights Lpj1 and Lpj2 correspond to the viewpoint position in the observation distance direction detected by the viewpoint position detection unit 11. The position of the lens 21 for adjusting the focusing position is controlled so that

FIG. 14 shows an example of the relationship between the observation distance Lo (observation position) and the lens position of the light collection position adjustment lens 21 in the video display device 1B. As shown in FIG. 12, the lens position values in FIG. 14 correspond to the positions of the rotation center axes of the first and second projector modules Pj1 and Pj2 (the center axis C1 of the cylindrical reflective surface of the reflective cylindrical screen 2). The origin is assumed to be the value, and the value changes in the - direction as the distance from the rotation center axis increases. When the lens 21 for adjusting the focusing position is a concave lens, as shown in FIG. 14, the observation distance Lo can be increased by, for example, moving the lens 21 for adjusting the focusing position away from the rotation center axis. can.

Other configurations, operations, and effects may be substantially the same as those of the video display device according to the first or second embodiment.

<4. Fourth embodiment>
Next, a video display device according to a fourth embodiment of the present disclosure will be described. Note that, hereinafter, parts that are substantially the same as the components of the video display device according to any one of the first to third embodiments will be denoted by the same reference numerals, and descriptions thereof will be omitted as appropriate.

In the video display devices according to the first to third embodiments, the case has been described in which projection light forming one viewpoint video is emitted from the first and second projector modules Pj1 and Pj2, respectively. The first and second projector modules Pj1 and Pj2 may each emit projection light that forms a plurality of viewpoint images.

FIG. 15 schematically shows a main part of a configuration example of a video display device 1C according to the fourth embodiment.

FIG. 15 shows an example in which projection light forming three viewpoint images is emitted from the first and second projector modules Pj1 and Pj2, respectively. Further, FIG. 15 shows an example of the configuration when displaying a color image. Note that the first and second projector modules Pj1 and Pj2 may each emit projection light that forms two viewpoint images or four or more viewpoint images.

For example, as shown in FIG. 15, the first and second projector modules Pj1 and Pj2 each use a scanning method that generates a viewpoint image by scanning a plurality of laser beams incident on a single scanning mirror at different angles. It may also be a type projector.

In the video display device 1C, the first projector module Pj1 includes, for example, a plurality of light sources 30R, 30G, 30B, a dichroic prism 31, a condenser lens 32, and a scanning mirror 33.

The light source 30R is a laser light source that emits multiple beams of R (red) color. The light source 30G is a laser light source that emits multiple beams of G (green) color. The light source 30B is a laser light source that emits a plurality of B (blue) color beams. The light source 30R, the light source 30G, and the light source 30B each include, for example, an edge laser array or a VCSEL (Vertical Cavity Surface Emitting Laser). Note that FIG. 15 representatively shows only a plurality of green beams (first projection light Lpj11, second projection light Lpj12, and third projection light Lpj13) from the light source 30G.

Dichroic prism 31 has multiple surfaces. The light source 30R is arranged to face the first surface of the dichroic prism 31. The light source 30G is arranged to face the second surface of the dichroic prism 32. The light source 30B is arranged to face the third surface of the dichroic prism 30.

The dichroic prism 30 has an optical path of a plurality of red beams incident on a first surface, an optical path of a plurality of green beams incident on a second surface, and an optical path of a plurality of blue beams incident on a third surface. The optical paths are combined and a plurality of beams of each color are emitted from the fourth surface toward the scanning mirror 33.

The condenser lens 32 condenses the plurality of beams of each color emitted from the dichroic prism 31 toward the scanning mirror 33 at mutually different angles.

The scanning mirror 33 is, for example, a two-axis MEMS mirror whose mirror surface can be tilted around two axes. The scanning mirror 33 directs each of the plurality of beams of each color (first projection light Lpj11, second projection light Lpj12, and third projection light Lpj13) toward the inner surface of the reflective cylindrical screen 2 in the horizontal and vertical directions. Scan two-dimensionally in the direction.

The second projector module Pj2 also has substantially the same configuration as the first projector module Pj1, and each of the first projection light Lpj21, the second projection light Lpj22, and the third projection light Lpj23 is formed into a reflective cylinder. The light is emitted toward the inner surface of the screen 2 in the horizontal and vertical directions.

FIG. 16 schematically shows the viewing range of the video display device 1C.

In the video display device 1C, each of the first projection light Lpj11, the second projection light Lpj12, and the third projection light Lpj13 from the first projector module Pj1 illuminates the left eye of the viewer in the horizontal direction, for example. Three viewpoint images are formed in mutually different areas (first projection area Ar11, second projection area Ar12, and third projection area Ar13) near 4L. In addition, each of the first projection light Lpj21, second projection light Lpj22, and third projection light Lpj23 from the second projector module Pj2 causes, for example, mutual interference near the observer's right eye 4R in the horizontal direction. Three viewpoint images are formed in different areas (first projection area Ar21, second projection area Ar22, and third projection area Ar23).

In this way, in the image display device 1C, a plurality of viewpoint images are formed near the left eye 4L and the right eye 4R in the horizontal direction. Therefore, it is possible to display stereoscopic video with high display quality over a wide range in the horizontal direction. For example, at the viewpoint position shown in FIG. 16A, the observer observes a stereoscopic image using the first projection lights Lpj11 and Lpj21 from the first and second projector modules Pj1 and Pj2, respectively. At the viewpoint position shown in FIG. 16(B), the observer observes a stereoscopic image using the second projection lights Lpj12 and Lpj22 from the first and second projector modules Pj1 and Pj2, respectively. At the viewpoint position of (C) in FIG. 16, the observer observes a stereoscopic image using the third projection lights Lpj13 and Lpj23 from the first and second projector modules Pj1 and Pj2, respectively.

The video display devices according to the first to third embodiments display stereoscopic video using only two-viewpoint videos. At this time, the horizontal diffusion angle of the two projection lights forming the two-viewpoint image is set, for example, to a diffusion angle equivalent to the convergence angle of both eyes at the optimal observation position. In this case, even if the projection unit is operated so that the observer's viewpoint position is detected and the two projection lights are focused on the binocular positions, detection errors and tracking delays occur in the viewpoint position detection unit 11. The viewpoint image may not be displayed at the correct viewpoint position. To compensate for this, it is necessary to set the diffusion angle wide enough that crosstalk does not become a problem. On the other hand, in the video display device 1C according to the fourth embodiment, instead of displaying the viewpoint video with a wide diffusion angle, the first and second projector modules Pj1 and Pj2 each display a range of convergence angles of both eyes, for example. By displaying multiple viewpoint images, an appropriate stereoscopic image display can be maintained even if the viewpoint position moves slightly in the horizontal direction. In the video display device 1C according to the fourth embodiment, for example, in order to reduce detection noise of the viewpoint position in the viewpoint position detection unit 11, noise may be removed by applying a filter in the time direction. Thereby, by detecting the viewpoint position only when the movement of the viewpoint position is slow to a certain extent, it is possible to reduce errors in stereoscopic video display caused by detection errors and the like.

Other configurations, operations, and effects may be substantially the same as those of the video display device according to any of the first to third embodiments.

<5. Fifth embodiment>
Next, a video display device according to a fifth embodiment of the present disclosure will be described. Note that, hereinafter, parts that are substantially the same as the components of the video display device according to any one of the first to fourth embodiments will be denoted by the same reference numerals, and a description thereof will be omitted as appropriate.

In the video display devices according to the first to fourth embodiments, the configuration example in which there is only one observer has been described. By providing a plurality of sections, it becomes possible to display stereoscopic images to a plurality of viewers. In this case, the viewpoint position detection unit 11 detects the viewpoint positions of each of the plurality of observers. Each of the plurality of projection parts is rotatably movable. The projector module position control section 12 rotates each of the plurality of projection sections to a position corresponding to the viewpoint position of a different viewer detected by the viewpoint position detection section 11.

FIG. 17 schematically shows the main parts of the video display device 1D-1 according to the first configuration example of the fifth embodiment when viewed from the top side. FIG. 18 schematically shows the main parts of a video display device 1D-2 according to a second configuration example of the fifth embodiment when viewed from the top side. FIG. 19 schematically shows the main parts of a video display device 1D-3 according to a third configuration example of the fifth embodiment when viewed from the top.

The video display devices 1D-1, 1D-2, and 1D-3 according to the first to third configuration examples each include three projection units (a first projector unit PjA, a second projector unit PjB, and a third projector unit PjC). Note that the configuration may include two or four or more projection units (projector units).

The first to third projector units PjA, PjB, and PjC each have a first projector module Pj1 and a second projector module Pj1 and a second projector module having substantially the same configuration as the video display device according to any one of the first to fourth embodiments. It includes a projector module Pj2.

In the video display device 1D-1 according to the first configuration example, as shown in FIG. 17, the first to third projector units PjA, PjB, and PjC are each arranged on the circumference of one rail 3. ing. The first to third projector units PjA, PjB, and PjC are each rotatably movable on the circumference of one rail 3 independently of each other.

As shown in FIG. 18, the video display device 1D-2 according to the second configuration example includes two circular rails 3A and 3B with different diameters instead of one rail 3. The two rails 3A and 3B are arranged on the same plane. The respective central axes of the two rails 3A and 3B substantially coincide with the central axis C1 of the reflective cylindrical screen 2. First to third projector units PjA, PjB, and PjC are each arranged on the circumference of one of the two rails 3A and 3B. In FIG. 18, a first projector unit PjA is arranged on the circumference of the rail 3A, and a second projector unit PjB and a third projector unit PjC are arranged on the circumference of the rail 3B.

The video display device 1D-3 according to the third configuration example, as shown in FIG. It is provided with two rails 3A and 3B of different circular shapes. However, in the video display device 1D-3 according to the third configuration example, the two rails 3A and 3B are stacked on different planes (at different positions in the Y direction in FIG. 19). For example, the rail 3A is arranged in a plane that includes the paper surface of FIG. 19, and the rail 3B is arranged above or below the plane that includes the paper surface. The other configurations are the same as the video display device 1D-2 according to the second configuration example.

In the video display devices 1D-2 and 1D-3 according to the second and third configuration examples, the rails 3A and 3B correspond to a specific example of the "rotation drive mechanism section" in the technology of the present disclosure.

Other configurations, operations, and effects may be substantially the same as those of the video display device according to any of the first to fourth embodiments.

<6. Sixth embodiment>
Next, a video display device according to a sixth embodiment of the present disclosure will be described. In addition, below, the same code|symbol is attached|subjected about the substantially same component as the component of the video display apparatus based on any one of the said 1st thru|or 5th embodiment, and description is abbreviate|omitted suitably.

FIG. 20 schematically shows a configuration example of a video display device 1E according to the sixth embodiment when viewed from the top.

A video display device 1E according to the sixth embodiment has a configuration in which a transmission type cylindrical screen 2A is provided in place of the reflection type cylindrical screen 2 compared to the video display device 1 according to the first embodiment. There is.

In the sixth embodiment, the transmission type cylindrical screen 2A corresponds to a specific example of a "diffusion member" in the technology of the present disclosure.

FIG. 21 schematically shows a configuration example of a transmission type cylindrical screen 2A in the video display device 1E. FIG. 22 schematically shows an equivalent configuration example of the transmission type cylindrical screen 2A in the video display device 1E.

The transmission type cylindrical screen 2A is a diffusion member having anisotropic diffusion characteristics that have different light diffusion characteristics in the horizontal direction and the vertical direction. The transmissive cylindrical screen 2A has two lenticular lenses (a first lenticular lens 41A and a first lenticular lens 41A) having the same thickness as the respective focal lengths f1 and f2 on both sides (inner circumferential surface and outer circumferential surface), as shown in FIG. It has a cylindrical surface that has a lens function equivalent to a structure in which two lenticular lenses 42A) are arranged facing each other.

The cylindrical surface of the transmission type cylindrical screen 2A acts as a light condensing section that condenses the first and second projection lights Lpj1 and Lpj2. The transmissive cylindrical screen 2A is composed of, for example, a transmissive holographic optical element (HOE). As shown in FIG. 21, the transmission type cylindrical screen 2A has, for example, an inner peripheral surface as a first HOE surface 41 and an outer peripheral surface as a second HOE surface 42. The first HOE surface 41 acts as the first lenticular lens 41A shown in FIG. 22. The second HOE surface 42 acts as the second lenticular lens 42A shown in FIG. 22. By adjusting the ratio of the respective focal lengths f1 and f2 of the first HOE surface 41 and the second HOE surface 42 of the transmission type cylindrical screen 2A, the first and second projection lights Lpj1 and Lpj2 can be observed optimally. Light can be focused at certain positions. Light diffusion is provided on both sides of the first HOE surface 41 and the second HOE surface 42 of the transmission type cylindrical screen 2A, or either one thereof, with relatively narrow diffusion in the horizontal direction and relatively wide diffusion in the vertical direction. Features are added. As a result, the transmission type cylindrical screen 2A focuses the first and second projection lights Lpj1 and Lpj2 toward the observer's viewpoint position on the cylindrical surface, while relatively narrowly diffusing them in the horizontal direction and relatively narrowly diffusing them in the vertical direction. Diffuses relatively widely in the direction.

In the sixth embodiment, the cylindrical surface of the transmissive cylindrical screen 2A corresponds to a specific example of a "light condensing section" in the technology of the present disclosure.

Other configurations, operations, and effects may be substantially the same as those of the video display device 1 according to the first embodiment.

(Modified example)
In the video display devices according to the second to fifth embodiments, the reflective cylindrical screen 2 may be replaced with a transmissive cylindrical screen 2A.

<7. Seventh embodiment>
Next, a video display device according to a seventh embodiment of the present disclosure will be described. Note that, hereinafter, parts that are substantially the same as the components of the video display device according to any one of the first to sixth embodiments will be denoted by the same reference numerals, and a description thereof will be omitted as appropriate.

FIG. 23 schematically shows a configuration example of a video display device 1F according to the seventh embodiment, viewed from the top. FIG. 24 schematically shows a configuration example of a side cross section of an image display device 1F according to the seventh embodiment.

A video display device 1F according to the seventh embodiment has a transparent cover 5 and a reflective flat screen 6 in place of the reflective cylindrical screen 2 in the video display device 1 according to the first embodiment. It has a well-equipped structure.

The transparent cover 5 has a cylindrical shape and is arranged at substantially the same position as the reflective cylindrical screen 2 in the video display device 1 according to the first embodiment. Note that the transparent cover 5 does not substantially have a lens effect or a light diffusing effect, and may be omitted from the configuration.

The reflective flat screen 6 is disposed, for example, near the center when viewed from the top. The reflective plane screen 6 includes a reflective plane having a lens action equivalent to a Fresnel lens. The reflective flat screen 6 is composed of, for example, a flat reflective holographic optical element (HOE), and the HOE surface is a reflective plane having a lens function. In the video display device 1F, projection light is emitted from each of the first and second projector modules Pj1 and Pj2 toward the reflective plane of the reflective flat screen 6. The HOE surface of the reflective flat screen 6 is provided with light diffusion characteristics that provide relatively narrow diffusion in the horizontal direction and relatively wide diffusion in the vertical direction. As a result, the reflective flat screen 6 focuses the first and second projection lights Lpj1 and Lpj2 from the first and second projector modules Pj1 and Pj2, respectively, toward the viewer's viewpoint position on the reflective plane. At the same time, the light is diffused so that it is relatively narrowly diffused in the horizontal direction and relatively widely diffused in the vertical direction.

In the seventh embodiment, the reflective flat screen 6 corresponds to a specific example of a "diffusion member" in the technology of the present disclosure. In the seventh embodiment, the reflective plane of the reflective flat screen 6 corresponds to a specific example of a "light condensing section" in the technology of the present disclosure.

FIG. 25 schematically shows an example of the relationship between the projection elevation angle θ and the rotational movement directions of the first and second projector modules Pj1 and Pj2 in the video display device 1 according to the first embodiment. FIG. 26 schematically shows an example of the relationship between the projection elevation angle θ and the rotational movement directions of the first and second projector modules Pj1 and Pj2 in the video display device 1F according to the seventh embodiment.

In the video display device 1 according to the first embodiment, the first and second projector modules Pj1 and Pj2 have a constant projection elevation angle θ with respect to the cylindrical reflective surface of the reflective cylindrical screen 2, as shown in FIG. It is preferable to rotate and move on a plane such that

Similarly, in the video display device 1F according to the seventh embodiment, the first and second projector modules Pj1 and Pj2 have a projection elevation angle θ with respect to the reflective plane of the reflective flat screen 6, as shown in FIG. It is preferable to rotate and move on a constant plane.

Here, in order to keep the projection elevation angle θ constant, the first and second projector modules Pj1 and Pj2 are rotated when using the reflective cylindrical screen 2 and when using the reflective flat screen 6. The planes to be used are different. When using the reflective cylindrical screen 2, as shown in FIG. 25, it rotates on a plane (ZX plane) that is not inclined in the vertical direction (Y axis). The rail 3 is arranged within the ZX plane.

When using the reflective plane screen 6, as shown in FIG. 26, it is rotated and moved on a plane inclined with respect to the vertical direction (Y-axis). In this case, the inclination angle is an angle corresponding to the projection elevation angle θ. The rail 3 is arranged in an inclined plane.

27 to 29 show an outline of the incident light vector R and the reflected light vector S on the reflective plane (HOE surface) of the reflective flat screen 6. K indicates a hologram vector.

By making the projection light incident on the reflective plane of the reflective flat screen 6 from a plane at the same angle as the projection elevation angle θ, the elevation angle (in the YZ cross section of the incident light vector R) with respect to the reflective flat screen 6 can be changed. angle) will be kept constant. As a result, the output elevation angle (the angle of the reflected light vector S in the YZ cross section) can also be made constant.

Other configurations, operations, and effects may be substantially the same as those of the video display device 1 according to the first embodiment.

<8. Eighth embodiment>
Next, a video display device according to an eighth embodiment of the present disclosure will be described. Note that, hereinafter, parts that are substantially the same as the components of the video display device according to any of the first to seventh embodiments will be denoted by the same reference numerals, and descriptions thereof will be omitted as appropriate.

FIG. 30 schematically shows a configuration example of a video display device 1G according to the eighth embodiment viewed from the top. FIG. 31 schematically shows a configuration example of a side cross section of a video display device 1G according to the eighth embodiment.

A video display device 1G according to the eighth embodiment includes a Fresnel lens rotating body 7 and a rotation stage 8 in place of the rail 3 in the video display device 1 according to the first embodiment. In addition, the video display device 1G includes a rotation control unit 14 that controls the rotation angle of the Fresnel lens rotating body 7 in place of the projector module position control unit 12 in the video display device 1 according to the first embodiment. We are prepared.

In the eighth embodiment, the first projector module Pj1, the second projector module Pj2, and the Fresnel lens rotating body 7 correspond to a specific example of the "projection unit" in the technology of the present disclosure. In the eighth embodiment, the rotation control unit 14 corresponds to a specific example of a “control unit” in the technology of the present disclosure.

The Fresnel lens rotating body 7 is arranged on a rotation stage 8 and is rotatably movable. The central axis of rotation of the Fresnel lens rotating body 7 substantially coincides with the central axis C1 of the reflective cylindrical screen 2.

The first and second projection lights Lpj1 and Lpj2 emitted from the first and second projector modules Pj1 and Pj2 are respectively transmitted through the Fresnel lens rotating body 7 and then observed by the cylindrical reflective surface of the reflective cylindrical screen 2. The light is focused towards the person's viewpoint. In the image display device 1G, instead of rotationally moving the first and second projector modules Pj1 and Pj2, the Fresnel lens rotating body 7 rotates, so that the condensing positions of the first and second projection lights Lpj1 and Lpj2 are adjusted. approximately coincides with the observer's viewpoint position.

The rotation control unit 14 controls the rotation stage 8 so that the rotation angle of the Fresnel lens rotating body 7 corresponds to the viewpoint position detected by the viewpoint position detection unit 11.

Other configurations, operations, and effects may be substantially the same as those of the video display device 1 according to the first embodiment.

<9. Ninth embodiment>
Next, a video display device according to a ninth embodiment of the present disclosure will be described. Note that, hereinafter, parts that are substantially the same as the components of the video display device according to any of the first to eighth embodiments will be denoted by the same reference numerals, and descriptions thereof will be omitted as appropriate.

FIG. 32 schematically shows a configuration example of a video display device 1H according to the ninth embodiment viewed from the top. FIG. 33 schematically shows a configuration example of a side cross section of a video display device 1H according to the ninth embodiment.

A video display device 1H according to the ninth embodiment is different from the video display device 1E (FIG. 20) according to the sixth embodiment in that a reflective eccentric Fresnel lens rotating body 9 is used instead of the rail 3. We are prepared. In addition, in the image display device 1E according to the sixth embodiment, the image display device 1H has a rotor that controls the rotation angle of the reflective eccentric Fresnel lens rotating body 9 instead of the projector module position control section 12. A control section 15 is provided.

In the ninth embodiment, the first projector module Pj1, the second projector module Pj2, and the reflective eccentric Fresnel lens rotating body 9 correspond to a specific example of the "projection unit" in the technology of the present disclosure. . In the ninth embodiment, the rotation control unit 15 corresponds to a specific example of a “control unit” in the technology of the present disclosure.

The reflective eccentric Fresnel lens rotating body 9 is disposed above the transmission type cylindrical screen 2A at a position serving as the top surface, and is rotatably movable. The center axis of rotation of the reflective eccentric Fresnel lens rotating body 9 substantially coincides with the center axis C1 of the transmission type cylindrical screen 2A. The first and second projector modules Pj1 and Pj2 are arranged at approximately the center position when viewed from the top.

The first and second projection lights Lpj1 and Lpj2 emitted from the first and second projector modules Pj1 and Pj2 are respectively reflected by the reflective eccentric Fresnel lens rotating body 9 and then reflected by the cylinder of the transmissive cylindrical screen 2A. The surface focuses the light toward the observer's viewpoint. In the video display device 1H, instead of rotationally moving the first and second projector modules Pj1 and Pj2, the reflective decentered Fresnel lens rotating body 9 rotates, so that the first and second projection lights Lpj1 and Lpj2 The light condensing position is made to approximately match the viewpoint position of the observer.

The rotation control section 15 controls the rotation angle of the reflective eccentric Fresnel lens rotating body 9 so that the angle corresponds to the viewpoint position detected by the viewpoint position detection section 11 .

Other configurations, operations, and effects may be substantially the same as those of the video display device 1E according to the sixth embodiment.

<10. Tenth embodiment>
Next, a video display device according to a tenth embodiment of the present disclosure will be described. Note that, hereinafter, parts that are substantially the same as the components of the video display device according to any one of the first to ninth embodiments will be denoted by the same reference numerals, and descriptions thereof will be omitted as appropriate.

FIG. 34 schematically shows a configuration example of a video display device 1I according to the tenth embodiment when viewed from the top. FIG. 35 schematically shows a configuration example of a side cross section of an image display device 1I according to the tenth embodiment.

The image display device 1I according to the tenth embodiment is different from the image display device 1E (FIG. 20) according to the sixth embodiment in that a transmission type eccentric Fresnel lens rotating body 9A is used instead of the rail 3. , and a reflecting mirror 22. In addition, in the image display device 1E according to the sixth embodiment, the image display device 1I has a rotor that controls the rotation angle of the transmission type eccentric Fresnel lens rotating body 9A instead of the projector module position control unit 12. A control section 15 is provided.

In the ninth embodiment, the first projector module Pj1, the second projector module Pj2, the transmissive eccentric Fresnel lens rotating body 9A, and the reflective mirror 22 are one example of the "projection unit" in the technology of the present disclosure. Corresponds to the example. In the ninth embodiment, the rotation control unit 15 corresponds to a specific example of a “control unit” in the technology of the present disclosure.

The transmission type eccentric Fresnel lens rotating body 9A is arranged at the bottom of the transmission type cylindrical screen 2A, and is rotatably movable. The central axis of rotation of the transmission type eccentric Fresnel lens rotating body 9A substantially coincides with the central axis C1 of the transmission type cylindrical screen 2A. The reflective mirror 22 is arranged on the optical path between the transmission type eccentric Fresnel lens rotating body 9A and the first and second projector modules Pj1 and Pj2.

The first and second projection lights Lpj1 and Lpj2 emitted from the first and second projector modules Pj1 and Pj2 are respectively reflected by the reflection mirror 22 and then transmitted through the transmission type decentered Fresnel lens rotating body 9A. . The first and second projection lights Lpj1 and Lpj2 that have passed through the transmission type eccentric Fresnel lens rotating body 9A are each condensed toward the viewer's viewpoint position by the cylindrical surface of the transmission type cylindrical screen 2A. In the image display device 1I, instead of rotationally moving the first and second projector modules Pj1 and Pj2, the transmission type eccentric Fresnel lens rotating body 9A rotates, so that the first and second projection lights Lpj1 and Lpj2 The light condensing position is made to approximately match the viewpoint position of the observer.

The rotation control unit 15 controls the rotation angle of the transmission type eccentric Fresnel lens rotating body 9A so that the angle corresponds to the viewpoint position detected by the viewpoint position detection unit 11.

Other configurations, operations, and effects may be substantially the same as those of the video display device 1E according to the sixth embodiment.

<11. Eleventh embodiment>
Next, a video display device according to an eleventh embodiment of the present disclosure will be described. Note that, hereinafter, parts that are substantially the same as the components of the video display device according to any one of the first to tenth embodiments will be denoted by the same reference numerals, and the description will be omitted as appropriate.

[11.1 Overview]
FIG. 36 shows an outline of the appearance of a video display device 1J according to the eleventh embodiment. FIG. 37 schematically shows a main part of a configuration example of the video display device 1J. FIG. 38 schematically shows a configuration example of a side cross section of the video display device 1J.

A video display device 1J according to the eleventh embodiment includes a transmission type cylindrical screen 2A similar to the video display device 1E (FIG. 20) according to the sixth embodiment. Further, like the video display device according to the fifth embodiment, the video display device 1J is capable of displaying stereoscopic video to multiple viewers by including a plurality of projection units. There is. In the video display device 1J, similarly to the video display device according to the fifth embodiment, the viewpoint position detection unit 11 detects the viewpoint positions of each of the plurality of viewers. Each of the plurality of projection parts is rotatably movable. The projector module position control section 12 rotates each of the plurality of projection sections to a position corresponding to the viewpoint position of a different viewer detected by the viewpoint position detection section 11.

The video display device 1J includes two projection units (a first projector unit PjA and a second projector unit PjB) as a plurality of projection units. The video display device 1J includes two turntables 50A and 50B corresponding to the two rails 3A and 3B in the video display device 1D-3 (FIG. 19) according to the third configuration example of the fifth embodiment. There is. The first projector unit PjA is placed on the turntable 50A. The second projector unit PjB is placed on the turntable 50B. Note that although FIG. 36 shows the projection section so as to be visible from the outside for the sake of explanation, a light shielding plate or the like may be arranged so that the projection section is not visible from the outside.

The first and second projector units PjA and PjB each include, for example, first and second projector modules Pj1 and Pj2 having substantially the same configuration as the video display device 1 and the like according to the first embodiment, respectively. There is.

The turntables 50A and 50B have different diameters and are stacked on different planes (at different positions in the Y direction in FIG. 36). For example, the turntable 50A has a larger diameter than the turntable 50B and is disposed on the upper side. Thereby, the turntables 50A and 50B can each rotate independently of each other. In the video display device 1J, by rotating each of the turntables 50A and 50B, it is possible to rotate each of the first and second projector units PjA and PjB independently of each other.

As shown in FIG. 37, the first and second projector units PjA and PjB each have a linear drive mechanism section 70 and 80, and on the turntables 50A and 50B, the projector units PjA and PjB move in a direction perpendicular to the rotational movement direction. It is possible to move in a straight line (in the observation distance direction). Thereby, in the video display device 1J, the emission position of each projection light from the first and second projector units PjA and PjB can be adjusted. Thereby, the condensing positions (focus positions) of the respective projection lights from the first and second projector units PjA and PjB can be adjusted.

The projector module position control section 12 controls the rotational position of each of the first and second projector units PjA and PjB to be a position corresponding to the horizontal viewpoint position of the viewer detected by the viewpoint position detection section 11. Then, the turntables 50A and 50B are rotated. Further, the projector module position control section 12 causes the positions of the first and second projector units PjA and PjB in the observation distance direction to match the viewpoint position of the observer in the observation distance direction detected by the viewpoint position detection section 11. The linear drive mechanisms 70 and 80 linearly move the first and second projector units PjA and PjB to the corresponding positions.

The viewpoint position detection unit 11 includes a camera module 51 for fine adjustment and a camera module 52 for coarse adjustment. The fine adjustment camera module 51 and the coarse adjustment camera module 52 each detect the viewer's viewpoint position, but have different detection ranges from each other, as will be described later.

In the eleventh embodiment, turntables 50A and 50B each correspond to a specific example of a "rotation drive mechanism section" in the technology of the present disclosure.

In the eleventh embodiment, the fine adjustment camera module 51 corresponds to a specific example of the "first detection unit" in the technology of the present disclosure. In the ninth embodiment, the rough adjustment camera module 52 corresponds to a specific example of the "second detection section" in the technology of the present disclosure.

As shown in FIG. 37, the fine adjustment camera module 51 is, for example, incorporated in each of the first and second projector units PjA and PjB together with the first and second projector modules Pj1 and Pj2 . Note that although FIG. 37 shows an example in which the fine adjustment camera module 51 is arranged between the first and second projector modules Pj1 and Pj2 , The arrangement of the adjustment camera module 51 is not limited to the example shown in FIG. 37.

As shown in FIG. 36, a plurality of coarse adjustment camera modules 52 (for example, two to four) are provided around the outer periphery of the housing 10, for example. The rough adjustment camera module 52 performs rough adjustment to determine, for example, how many people are present around the video display device 1J and for which person the fine adjustment camera module 51 should detect the viewpoint position.

The center axis of rotation of each of the turntables 50A and 50B substantially coincides with the center axis C1 of the transmission type cylindrical screen 2A. As shown in FIG. 38, each of the turntables 50A and 50B has a center of rotation as a hollow portion 61 in which a wiring 62 can be placed. The wiring 62 includes, for example, electrical wiring and optical communication wiring connected to each of the first and second projector units PjA and PjB.

When a DC (direct current) motor is arranged at the rotation center as a mechanism for rotationally driving the turntables 50A, 50B, the electricity of the first and second projector units PjA, PjB installed on the turntables 50A, 50B is The wiring 62 such as wiring and optical communication wiring is passed through a gap between the outer peripheral part and the case. In that case, it goes without saying that the wiring 62 is twisted as it rotates, but the distance over which the circumference is rubbed becomes longer, increasing the possibility that the wiring will break. Also, due to the twist, the angle through which it can be rotated is very limited.

However, if each of the turntables 50A and 50B has a hollow drive mechanism that does not have a rotating shaft near the center, rotational twist can be minimized, so the angle at which the turntables can be rotated is large, such as several rotations or more. becomes possible. In addition, since the rotational load can be reduced, high-speed rotation is possible, and durability is also improved. Furthermore, as in a video display device 1K (FIGS. 59 to 65) according to the twelfth embodiment described later, it is also possible to arrange the projection section in a hollow portion, increasing the degree of freedom in optical design. For example, a structure using a full-periphery lens 310 is also possible, as in a video display device 1K (FIGS. 59 to 65) according to a twelfth embodiment described later.

FIG. 39 schematically shows a first example of a projection state by the first projector unit PjA in the video display device 1J. FIG. 40 schematically shows a first example of a projection state by the second projector unit PjB in the video display device 1J.

As shown in FIGS. 39 and 40, the projection light may be directly projected from the first and second projector units PjA and PjB toward the cylindrical surface of the transmissive cylindrical screen 2A. An observer can observe a stereoscopic image in the first and second projection areas Ar1 and Ar2. The fine adjustment camera module 51 is capable of detecting the observer's viewpoint position within a shooting area Arω (shooting angle of view) that is substantially the same as the first and second projection areas Ar1 and Ar2.

In addition, in each of the turntables 50A and 50B, on the opposite side (opposite side) of the first and second projector units PjA and PjB, there is a shape marker that serves as a shape marker for detecting the viewpoint position by the fine adjustment camera module 51. Sights 91A and 91B may be provided.

FIG. 41 schematically shows a second example of a projection state by the first projector unit PjA in the video display device 1J. FIG. 42 schematically shows a second example of a projection state by the second projector unit PjB in the video display device 1J.

As shown in FIGS. 41 and 42, a reflecting mirror 23 may be provided on the optical path of the projection light from the first and second projector units PjA and PjB in turntables 50A and 50B, respectively. Then, the projection light from the first and second projector units PjA and PjB may be reflected by the reflection mirror 23 and then projected toward the cylindrical surface of the transmission type cylindrical screen 2A. Further, a relay lens 24 may be arranged on the optical path between the first and second projector units PjA and PjB and the reflecting mirror 23, respectively.

(Example of configuration of rotational drive mechanism)
FIG. 43 and FIG. 44 schematically show main parts of a configuration example of the video display device 1J. FIG. 45 schematically shows essential parts of an example of the configuration of the video display device 1J in an exploded state. FIG. 46 schematically shows a main part of a configuration example of the video display device 1J. Note that FIGS. 43 to 46 show a case where the projection light from the first and second projector units PjA and PjB is reflected by the reflection mirror 23 and projected, as in the configuration example shown in FIGS. 41 and 42. An example of the configuration is shown below.

As shown in FIGS. 43 to 46, the rotational drive mechanism includes, for example, a ring-type ultrasonic motor.

As shown in FIGS. 43 to 46, ring-type ultrasonic motors of different sizes are arranged at the bottom of each of the turntables 50A and 50B, and drive each of the turntables 50A and 50B in the rotational direction. It is possible. Each of the turntables 50A and 50B can be rotationally driven without interfering with each of the first and second projector units PjA and PjB. Wiring 62 such as electrical wiring and optical communication wiring of each of the first and second projector units PjA and PjB is connected from the central hollow portion 61 to a system circuit section and a power supply section (not shown) in the lower part.

FIGS. 47 and 48 show modified examples of the rotational drive mechanism section in the video display device 1J. FIG. 47 schematically shows a planar configuration example of a rotational drive mechanism section according to a modification. FIG. 48 schematically shows an external configuration example of a rotational drive mechanism section according to a modification.

As shown in FIGS. 47 and 48, the rotational drive mechanism may include a gear drive motor disposed on the outer periphery. As shown in FIGS. 47 and 48, a turntable-side gear 53 and a drive-side gear 54 meshing with the turntable-side gear 53 are provided on the outer periphery of each of the turntables 50A and 50B. Good too. The drive side gear 54 may be driven by a DC motor 55. The turntable side gear 53 may be driven by the DC motor 55 via the drive side gear 54.

When rotating the turntables 50A and 50B according to the viewer's viewpoint position, the ring-type ultrasonic motor has a short start-up time and reversal time, and can quickly follow the detailed and quick movements of the viewer. Become. On the other hand, a gear-driven motor arranged on the outer periphery takes a long time to start up and reverse, but it is possible to follow the movement of the observer at a high speed when the observer continues to move rapidly in a certain direction. It is sufficient to select a motor that corresponds to the expected movement of the observer. Also, although the structure becomes complicated, by using both of these two motors, it becomes possible to follow both small and quick movements as well as movements that continue to move quickly in a fixed direction.

[11.2 Detection method of viewpoint position]
FIG. 49 schematically shows the arrangement of the fine adjustment camera module 51 and the rough adjustment camera module 52 in the video display device 1J. Note that the fine adjustment camera module 51 incorporated in each of the first and second projector units PjA and PjB allows the viewpoint position to be detected independently in each of the first and second projector units PjA and PjB. It is. In the following, since the method of detecting the viewpoint position in the first and second projector units PjA and PjB is the same, the method of detecting the viewpoint position will be described without distinguishing between the first and second projector units PjA and PjB. do.

The detection range of the viewpoint position by the fine adjustment camera module 51 is, for example, the range in which the projection light (first and second projection light Lpj1, Lpj2) by the first and second projector modules Pj1, Pj2 is actually projected. This is at least a part of the range (first and second projection areas Ar1, Ar2). The fine adjustment camera module 51 detects, for example, a viewpoint position in the vicinity of where the projection light is actually projected.

A plurality of coarse adjustment camera modules 52 are provided around the outer periphery of the housing 10 of the video display device 1J. The detection range of the viewpoint position by the plurality of coarse adjustment camera modules 52 includes, for example, the entire range in which projection light can be projected. The plurality of rough adjustment camera modules 52 detect the viewpoint position, for example, around the entire periphery of the transparent cylindrical screen 2A, that is, around 360°.

Conventionally, coarse adjustment cameras such as those used in the coarse adjustment camera module 52 have been used in various human recognition technologies. However, the spatial resolution of the small camera module is low, and the position relative to the projected image cannot be precisely controlled. Therefore, the fine adjustment camera module 51 is placed on the turntables 50A and 50B together with the first and second projector modules Pj1 and Pj2 that project images. As a result, the fine adjustment camera module 51 rotates and moves at the same time as the image, so it is possible to improve the accuracy of detecting the viewpoint position and the accuracy of adjusting the positions of the first and second projector modules Pj1 and Pj2 in accordance with the viewpoint position. can.

In the video display device 1J, since the rough adjustment camera module 52 can roughly determine the viewer's viewpoint position, after roughly tracking the viewer's viewpoint position, the fine adjustment camera module 51 can track the viewer within a narrow range. All you need to do is to understand the viewpoint position in detail. Thereby, the viewing angle of the detection lens system in the fine adjustment camera module 51 can be narrowed. As a result, the resolution per pixel can be finely controlled in order to image only the area near the observer's face and eyes.

FIG. 50 schematically shows a first example of a method for detecting a viewpoint position in the video display device 1J.

First and second projection light Lpj1, Lpj2 including first and second detection markers Ir1, Ir2 are emitted from the first and second projector modules Pj1, Pj2, respectively. Thereby, for example, as shown in FIG. 50, the first and second detection markers Ir1 and Ir2 are drawn in the vertical direction. The wavelength used for the first and second detection markers Ir1 and Ir2 is preferably near infrared, but is not limited to near infrared.

The fine adjustment camera module 51 detects the projected positions of the first and second detection markers Ir1 and Ir2 and the positions of both eyes of the observer. The projector module position control unit 12 calculates the difference between the projection positions of the first and second detection markers Ir1 and Ir2 and the position of the observer's eyes. For example, FIG. 50A shows an example in which the projection positions of the first and second detection markers Ir1 and Ir2 are shifted to the right with respect to both eyes of the observer when viewed from the fine adjustment camera module 51 side. shows. FIG. 50B shows an example in which the projected positions of the first and second detection markers Ir1 and Ir2 match the observer's eyes. FIG. 50C shows an example in which the projection positions of the first and second detection markers Ir1 and Ir2 are shifted to the left with respect to both eyes of the observer when viewed from the fine adjustment camera module 51 side. show.

The projector module position control unit 12 controls, for example, the first and second projector units PjA and PjB based on the difference between the projection positions of the first and second detection markers Ir1 and Ir2 and the position of the observer's eyes. The turntables 50A and 50B are rotated so that their respective rotational positions correspond to the detected horizontal viewpoint position of the observer.

When performing color display, the first and second projector modules Pj1 and Pj2 have light sources of three colors, for example, R (red), G (green), and B (blue). In this case, by adding, for example, a near-infrared light source to the three color light sources in each of the first and second projector modules Pj1 and Pj2, a part of the viewpoint image is vertically illuminated for viewpoint position detection. The light including the first and second detection markers Ir1 and Ir2 is emitted. In this case, the first and second detection markers Ir1 and Ir2 are detected by configuring the fine adjustment camera module 51 to include a detection element sensitive to visible light and near infrared light. Since the fine adjustment camera module 51 has visible light sensitivity, it can simultaneously detect the position of the observer's face and eyes and the positions of the first and second near-infrared detection markers Ir1 and Ir2. For example, the projector module position control unit 12 rotates the turntables 50A and 50B so that the positions of the first and second detection markers Ir1 and Ir2 match the positions of the left eye 4L and the right eye 4R. The positions of the first and second projector units PjA and PjB are made to follow the viewpoint position of the observer. This allows extremely accurate tracking. Note that the fine adjustment camera module 51 does not need to be integrated into the first and second projector units PjA and PjB as long as it is on the turntables 50A and 50B.

FIG. 51 schematically shows a second example of a method for detecting a viewpoint position in the video display device 1J.

The video display device 1J may further include a shape marker that rotates and moves together with the projection section. The fine adjustment camera module 51 may be able to detect the position of the shape marker and the position of the viewer's eyes with respect to the viewer. The projector module position control section 12 may rotate the projection section based on the difference between the position of the shape marker with respect to the observer and the position of the observer's eyes.

For example, in each of the turntables 50A and 50B, sights 91A and 91B serving as shape markers may be provided on the opposite side (opposite side) of the first and second projector units PjA and PjB.

The fine adjustment camera module 51 detects the aiming reference positions 91C of the sights 91A and 91B and the positions of both eyes of the observer. The projector module position control unit 12 calculates the difference between the aiming reference position 91C and the position of the observer's eyes. For example, FIG. 51A shows an example in which the aiming reference position 91C is shifted to the right with respect to both eyes of the observer when viewed from the fine adjustment camera module 51 side. FIG. 51(B) shows an example where the aim reference position 91C and both eyes of the observer match. FIG. 51C shows an example in which the aiming reference position 91C is shifted to the left with respect to both eyes of the observer when viewed from the fine adjustment camera module 51 side.

In this second detection method, unlike the first detection method in FIG. 50, there is no need to include a detection marker in the projected image. For example, a shape marker such as a convex portion is placed as a structure at a position facing the fine adjustment camera module 51 on the turntables 50A, 50B, and a position extending above the shape marker (aim reference position 91C) is set. Tracking control is performed to match the position of the observer's face and eyes. In this case, an infrared light source or the like for generating a detection marker as in the first detection method is not required, resulting in an inexpensive configuration.

[11.3 Example of linear drive mechanism of projector unit (projection unit)]
In the video display device 1J, linear drive mechanism sections 70 and 80 are provided on both sides of the first and second projector units PjA and PjB. This allows the first and second projector units PjA and PjB to move linearly in a direction (observation distance direction) orthogonal to the rotational movement direction. Thereby, the condensing positions (focus positions) of the respective projection lights from the first and second projector units PjA and PjB can be adjusted. The linear drive mechanisms 70 and 80 may include a direct-acting ultrasonic motor or a stepping motor.

(Linear drive mechanism using ultrasonic motor)
52 and 53 schematically show a first example of a linear drive mechanism for the first and second projector units PjA and PjB in the video display device 1J. FIG. 52 shows an example of a planar configuration. FIG. 53 shows an example of the external configuration.

The linear drive mechanism section 70 includes a shaft 71, a turntable side bearing 72, a turntable side bearing 73, a bearing 74, a pressurizing spring 75, a weight 76, and a piezoelectric element 77. It's okay.

The linear drive mechanism section 80 may have a configuration including a shaft 81, a turntable side bearing 82, a turntable side bearing 83, and a bearing 84.

The first and second projector units PjA and PjB are linearly movable along the shaft 71 of the linear drive mechanism section 70 and the shaft 81 of the linear drive mechanism section 80, respectively. The linear drive mechanism section 70 includes an ultrasonic motor. The weight 76 is a weight with a heavy specific gravity for receiving the vibration of the piezoelectric element 77 serving as a vibration source. A stacked piezoelectric element 77 is bonded to the tip of the weight 76 . At the tip of the piezoelectric element 77, there is a shaft 71 for transmitting driving force in the form of a saw vibration waveform, and the movement of the shaft 71 is controlled by bearings 74 formed in each of the first and second projector units PjA and PjB. Accept it. A pressurizing spring 75 is added to the bearing 74, which causes strong sliding friction between the shaft 71 and the bearing 74.

FIG. 54 schematically shows an example of the driving principle of an ultrasonic motor. FIG. 55 schematically shows the relationship between the drive voltage (drive waveform) of the ultrasonic motor and the displacement of the movable part. The positions (A), (B), and (C) of the drive waveform in FIG. 55 correspond to the states (A), (B), and (C) in FIG. 54.

When the linear drive mechanism section 80 is not being driven, the first and second projector units PjA and PjB are held in their linear positions ((A) in FIG. 54). When the sawtooth wave drive is performed as shown in FIG. 55, the first and second projector units PjA and PjB slide in the direction where the slope of the waveform is steep and follow the direction where the slope of the waveform is flat. will each move in one direction ((B), (C) in FIG. 54). Direct-acting ultrasonic motors have short start-up and reversal times, making it possible to quickly follow detailed and quick movements of the observer.

(Linear drive mechanism using stepping motor)
FIG. 56 schematically shows a second example of a linear drive mechanism for the first and second projector units PjA and PjB in the video display device 1J. FIG. 56 shows an example of a planar configuration.

The linear drive mechanism section 70 has a turntable side tip pivot bearing 72A, a turntable side bearing 73, a bearing 74, a toothed pressurization spring 75A, a lead screw 78, and a stepping motor 79. It's okay.

The linear drive mechanism section 80 may have a configuration including a shaft 81, a turntable side bearing 82, a turntable side bearing 83, and a bearing 84.

The first and second projector units PjA and PjB are linearly movable along the lead screw 78 of the linear drive mechanism section 70 and the shaft 81 of the linear drive mechanism section 80, respectively. The teeth of the lead screw 78 mesh with the teeth of the toothed pressurizing spring 75A. Thereby, by rotating the lead screw 78 with the stepping motor 79, the first and second projector units PjA and PjB joined to the toothed pressurizing spring 75A can be moved linearly.

57 and 58 schematically show an example of the driving principle of the stepping motor 79.

The stepping motor 79 includes, for example, a circular stator around which a plurality of coils L1, L2, L3, and L4 are wound, and a rotor made of magnets. The rotor is rotatably disposed at the center of the inner circumferential side of the stator.

The rotation angle of the rotor is determined depending on which of the plurality of coils L1, L2, L3, and L4 the current is passed through. FIG. 57 shows a state in which a current is passed through the coil L1. In this case, the coil L1 becomes an electromagnet (eg, S pole), and one end (eg, N pole) of the central rotor is attracted by the magnetic force of the coil L1, rotates, and stops at a position facing the coil L1. Moreover, FIG. 58 shows a state in which a current is passed through the coil L2. In this case, the coil L2 becomes an electromagnet (eg, S pole), and one end (eg, N pole) of the central rotor is attracted by the magnetic force of the coil L2, rotates, and stops at a position facing the coil L2. Note that although FIGS. 57 and 58 simply show an example in which the step angle is 90°, the step angle can be reduced by increasing the number of magnetic poles of the rotor and stator.

(Other linear drive mechanisms)
Moreover, a configuration using a rack-and-pinion type DC motor as the linear drive mechanism may be used. In the case of a rack-and-pinion type DC motor, the start-up time and reversal time are long, but it is possible to follow the movement of the observer quickly in a fixed direction at a high speed. A linear drive mechanism using a stepping motor has performance intermediate between two characteristics: a linear drive mechanism using a rack-and-pinion type DC motor and a linear drive mechanism using an ultrasonic motor. It is sufficient to select a motor that corresponds to the assumed movement of the observer. Also, although the structure becomes complicated, by using two different methods together, it becomes possible to follow both small and quick movements as well as movements that continue to move rapidly in a fixed direction.

Other configurations, operations, and effects are the video display device 1 according to the first embodiment, the video display device 1E according to the fifth embodiment, or the video display device 1E according to the sixth embodiment. etc. may be substantially the same.

<12. Twelfth embodiment>
Next, a video display device according to a twelfth embodiment of the present disclosure will be described. Note that, hereinafter, parts that are substantially the same as the components of the video display device according to any one of the first to eleventh embodiments will be denoted by the same reference numerals, and the description will be omitted as appropriate.

FIG. 59 shows an outline of the appearance of a video display device 1K according to the twelfth embodiment. FIG. 60 schematically shows a main part of a configuration example of the video display device 1K. FIG. 61 schematically shows a main part of a configuration example of a side cross section of the video display device 1K. FIG. 62 schematically shows a first example of a projection state by the video display device 1K. FIG. 63 schematically shows a second example of a projection state by the video display device 1K.

A video display device 1K according to the twelfth embodiment includes a transmission type cylindrical screen 2A like the video display device 1J according to the eleventh embodiment. Further, the video display device 1K includes a first projector unit PjA having the same configuration as the video display device 1J according to the eleventh embodiment, as a projection section.

The video display device 1K includes a full-periphery lens 310 placed below the transmissive cylindrical screen 2A. The upper part of the omnidirectional lens 310 is a reflective surface 311.

Furthermore, the video display device 1K includes a reflective section 313 placed below the omnidirectional lens 310. A central portion of the upper part of the housing 10 and a central portion of the reflecting section 313 are hollow portions 320 . The inner surface of the reflecting portion 313 is a reflecting surface 312 .

The first projector unit PjA is arranged to emit the first and second projection lights Lpj1 and Lpj2 toward the reflective surface 311 of the omnidirectional lens 310. In the hollow part 320, a relay lens 321 may be arranged on the optical path of the first and second projection lights Lpj1 and Lpj2.

The first projector unit PjA is disposed in the hollow portion 320 so as to be rotatably movable around the entire circumference by a rotational drive mechanism such as a ring-type ultrasonic motor. Furthermore, the first projector unit PjA is equipped with a linear drive mechanism having the same configuration as the video display device 1J according to the eleventh embodiment, and is linearly moved in the vertical direction (Y direction in FIGS. 59 to 63). It is considered possible.

In the video display device 1K, as shown in FIGS. 61 to 63, the first and second projection lights Lpj1 and Lpj2 from the first projector unit PjA are reflected by the upper reflective surface 311 of the omnidirectional lens 310. After that, the light is further reflected by a reflecting surface 312 of a reflecting section 313 disposed below the omnidirectional lens 310. The first and second projection lights Lpj1 and Lpj2 reflected by the reflective surface 312 are emitted toward the cylindrical surface of the transmissive cylindrical screen 2A via the omnidirectional lens 310. As the first projector unit PjA rotates around the entire periphery, a projected image 330 by the first and second projection lights Lpj1 and Lpj2 is formed on the reflective surface 312 over the entire periphery. The projected image 330 formed on the reflective surface 312 is observed by an observer via the omnidirectional lens 310 and the transmission type cylindrical screen 2A. Thereby, the viewer can observe the projected image 330 all around the transmission type cylindrical screen 2A. FIGS. 62 and 63 schematically show projection states by the video display device 1K when viewers are located at different positions.

(Modified example)
FIG. 64 schematically shows a first modification of the video display device according to the twelfth embodiment. FIG. 65 schematically shows a second modification of the video display device according to the twelfth embodiment.

The external shapes of the omnidirectional lens 310 and the reflective section 313 are not limited to the shapes shown in FIGS. 59 to 63. Furthermore, the omnidirectional lens 310 and the reflecting section 313 may be constructed from separate members. For example, as shown in FIG. 64, a configuration may be adopted in which the reflecting portion 313 is provided with a full-periphery lens 310A having a different outer diameter. Further, as shown in FIG. 65, a configuration including a reflecting portion 313A in which the cross section of the reflecting surface 312 is linear may be used.

Further, the entire circumference lens 310 is not limited to a structure in which the entire interior is filled with a glass material or a transparent resin material, but may have a structure having a hollow portion.

Other configurations, operations, and effects may be substantially the same as those of the video display device 1J and the like according to the eleventh embodiment.

<13. Other embodiments>
The technology according to the present disclosure is not limited to the description of each embodiment above, and various modifications can be implemented.

For example, the present technology can also take the following configuration. According to the present technology having the following configuration, it is possible to perform multi-view video display with high display quality over a wide range without increasing the size of the configuration.

(1)
a projection unit, at least a portion of which is rotationally movable, and emits projection light forming at least one viewpoint image;
a condensing section that condenses the projection light;
a diffusion member that diffuses the projection light so that the projection light is relatively narrowly diffused in the horizontal direction and relatively widely diffused in the vertical direction;
a detection unit that detects the viewpoint position of the observer;
A control section that rotates at least a portion of the projection section to a position corresponding to the viewpoint position detected by the detection section.
(2)
The video display device according to (1) above, wherein at least a portion of the projection section rotates so that a projection elevation angle with respect to the diffusion member is constant.
(3)
The projection unit is capable of adjusting a condensing position of the projection light,
The image according to (1) or (2) above, wherein the control unit controls the projection unit so that a condensing position of the projection light is a position corresponding to the viewpoint position detected by the detection unit. Display device.
(4)
The video display device according to any one of (1) to (3) above, wherein the diffusion member diffuses the projection light so as to have a nearly rectangular diffusion distribution in the horizontal direction.
(5)
The image display device according to any one of (1) to (4) above, wherein the projection unit emits projection light that forms three or more viewpoint images.
(6)
a plurality of the projection units; the detection unit is capable of detecting the viewpoint position of each of the plurality of observers;
At least a portion of each of the plurality of projection units is rotatably movable,
The control unit rotationally moves at least a portion of each of the plurality of projection units to a position corresponding to a viewpoint position of a mutually different observer detected by the detection unit. The video display device according to item 1.
(7)
The image display device according to any one of (1) to (6) above, wherein the light condensing section includes a reflective holographic optical element formed on a cylindrical surface.
(8)
Any one of (1) to (6) above, wherein the light condensing section includes a cylindrical surface on both sides that has a lens function equivalent to a structure in which two lenticular lenses having the same thickness as each focal length are arranged facing each other. The video display device described in .
(9)
The image display device according to any one of (1) to (6) above, wherein the light condensing section includes a plane having a lens function equivalent to a Fresnel lens.
(10)
The video display device according to any one of (1) to (8) above, wherein the projection unit includes a Fresnel lens that is rotatably movable.
(11)
The video display device according to any one of (1) to (8) above, wherein the projection unit includes an eccentric Fresnel lens that is rotationally movable.
(12)
a rotational drive mechanism unit whose rotation center is hollow in which wiring can be placed, and which rotationally moves the projection unit;
The video display device according to any one of (1) to (6) above, further comprising:
(13)
The video display device according to (12) above, wherein the wiring includes electrical wiring and optical communication wiring connected to the projection section.
(14)
The plurality of projection units are arranged on different planes or on different circumferences so that at least some of the projection units can rotate independently of each other,
In (6) above, the control unit rotates at least a portion of each of the plurality of projection units to a position corresponding to a viewpoint position of a mutually different observer detected by the detection unit. The video display device described.
(15)
The image display device according to (12) or (13), wherein the rotational drive mechanism includes a ring-type ultrasonic motor or a gear drive motor arranged on the outer periphery.
(16)
The projection unit includes a direct-acting ultrasonic motor or a stepping motor, and can adjust the condensing position of the projection light by moving linearly by the direct-acting ultrasonic motor or the stepping motor. The video display device according to (3) above.
(17)
The video display device according to any one of (1) to (16) above, wherein the detection section includes first and second detection sections having mutually different detection ranges.
(18)
The detection range of the first detection unit is at least a part of the range where the projection light is actually projected,
The image display device according to (17) above, wherein the detection range of the second detection unit includes the entire range in which the projection light can be projected.
(19)
The projection unit emits projection light including a detection marker,
The first detection unit is capable of detecting a projected position of the detection marker and a position of the observer's eyes,
The control unit rotates at least a portion of the projection unit based on the difference between the projection position of the detection marker and the eye position of the observer. The image according to (17) or (18) above. Display device.
(20)
Further comprising a shape marker that rotates and moves together with at least a portion of the projection section,
The first detection unit is capable of detecting the position of the shape marker with respect to the observer and the position of the observer's eyes,
As described in (17) or (18) above, the control unit rotationally moves at least a portion of the projection unit based on a difference between a position of the shape marker with respect to the observer and a position of the observer's eyes. video display device.

This application claims priority based on Japanese Patent Application No. 2018-205353 filed at the Japan Patent Office on October 31, 2018, and all contents of this application are incorporated herein by reference. Incorporate it into your application.

Various modifications, combinations, subcombinations, and changes may occur to those skilled in the art, depending on design requirements and other factors, which may come within the scope of the appended claims and their equivalents. It is understood that the

Claims (20)

a projection unit, at least a portion of which is rotationally movable, and emits projection light forming at least one viewpoint image;
a condensing section that condenses the projection light;
a diffusion member that diffuses the projection light so that the projection light is relatively narrowly diffused in the horizontal direction and relatively widely diffused in the vertical direction;
a detection unit that detects the viewpoint position of the observer;
a control unit that rotates at least a portion of the projection unit to a position corresponding to the viewpoint position detected by the detection unit ;
The projection unit emits projection light including a detection marker,
The detection unit is capable of detecting a projected position of the detection marker and a position of the observer's eyes,
The control unit rotates at least a portion of the projection unit based on a difference between a projection position of the detection marker and a position of the observer's eyes.
Video display device. The video display device according to claim 1, wherein at least a portion of the projection section rotates so that a projection elevation angle with respect to the diffusion member is constant. The projection unit is capable of adjusting a condensing position of the projection light,
The video display device according to claim 1 , wherein the control unit controls the projection unit so that a condensing position of the projection light corresponds to the viewpoint position detected by the detection unit. The video display device according to claim 1, wherein the diffusion member diffuses the projection light so as to have a nearly rectangular diffusion distribution in the horizontal direction. The image display device according to claim 1, wherein the projection unit emits projection light that forms three or more viewpoint images. a plurality of the projection units; the detection unit is capable of detecting the viewpoint position of each of the plurality of observers;
At least a portion of each of the plurality of projection units is rotatably movable,
The video display device according to claim 1, wherein the control unit rotates at least a portion of each of the plurality of projection units to a position corresponding to a viewpoint position of a mutually different observer detected by the detection unit. The image display device according to claim 1, wherein the light condensing section includes a reflective holographic optical element formed on a cylindrical surface. The image display device according to claim 1, wherein the light condensing section includes a cylindrical surface on both sides having a lens function equivalent to a structure in which two lenticular lenses having the same thickness as each focal length are arranged facing each other. The image display device according to claim 1, wherein the light condensing section includes a plane having a lens function equivalent to a Fresnel lens. The projection unit includes a Fresnel lens that is rotationally movable,
The control unit rotates the Fresnel lens to a position corresponding to the viewpoint position detected by the detection unit.
The video display device according to claim 1. The projection unit includes an eccentric Fresnel lens that is rotationally movable,
The control unit rotates the eccentric Fresnel lens to a position corresponding to the viewpoint position detected by the detection unit.
The video display device according to claim 1. a rotational drive mechanism unit whose rotation center is hollow in which wiring can be placed, and which rotationally moves the projection unit;
The video display device according to claim 1, further comprising: The video display device according to claim 12, wherein the wiring includes electrical wiring and optical communication wiring connected to the projection section. The plurality of projection units are arranged on different planes or on different circumferences so that at least some of the projection units can rotate independently of each other,
The control unit rotates at least a portion of each of the plurality of projection units independently from each other to a position corresponding to a viewpoint position of a mutually different observer detected by the detection unit. video display device. The image display device according to claim 12, wherein the rotational drive mechanism includes a ring-type ultrasonic motor or a gear drive motor arranged on the outer periphery. The projection unit includes a direct-acting ultrasonic motor or a stepping motor, and can adjust the condensing position of the projection light by moving linearly by the direct-acting ultrasonic motor or the stepping motor. The video display device according to claim 3. The video display device according to claim 1, wherein the detection section includes first and second detection sections having mutually different detection ranges. The detection range of the first detection unit is at least a part of the range where the projection light is actually projected,
The image display device according to claim 17, wherein a detection range of the second detection unit includes the entire range in which the projection light can be projected. The video display device according to claim 17, wherein the first detection unit is capable of detecting a projected position of the detection marker and a position of the observer's eyes . a projection unit, at least a portion of which is rotationally movable, and emits projection light forming at least one viewpoint image;
a condensing section that condenses the projection light;
a diffusion member that diffuses the projection light so that the projection light is relatively narrowly diffused in the horizontal direction and relatively widely diffused in the vertical direction;
a detection unit that detects the viewpoint position of the observer;
a control unit that rotates at least a portion of the projection unit to a position corresponding to the viewpoint position detected by the detection unit;
a shape marker that rotates and moves together with at least a portion of the projection section;
Equipped with
The detection unit is capable of detecting the position of the shape marker with respect to the observer and the position of the observer's eyes,
The control unit rotates at least a portion of the projection unit based on a difference between a position of the shape marker with respect to the observer and a position of the observer's eyes.
Video display device.

Images