JPWO2020090422A1 - Video display device - Google Patents

Abstract

The image display device of the present disclosure has a projection unit that emits projected light that forms at least one viewpoint image, which is at least partially rotatable, a condensing unit that collects the projected light, and the projected light. A diffusion member that diffuses so as to be relatively narrow diffusion in the horizontal direction and relatively wide diffusion in the vertical direction, a detection unit that detects the viewpoint position of the observer, and at least a part of the projection unit are detected by the detection unit. It is provided with a control unit that rotates and moves to a position corresponding to the detected viewpoint position.

Description

The present disclosure relates to an image display device that displays a plurality of viewpoint images.

There is a technique for displaying a stereoscopic image by displaying a plurality of images (viewpoint images) viewed from different viewpoints on the same screen. For example, by arranging multiple projectors on the circumference and arranging a screen that diffuses only in the vertical direction in the center, and projecting viewpoint images from each of the multiple projectors on the screen at different angles, the center There is a technique for displaying a stereoscopic image (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 Unexamined Patent Publication No. 2010-32952

In the above technique, the size of the entire image display device is increased due to the limitation of the occupied area of the components of the plurality of projectors. Further, the arrangement pitch between the plurality of projectors is determined by the size of each projector, and the angular resolution, which is an element that determines the display quality of the stereoscopic image, is restricted in terms of characteristics.

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

The image display device according to the embodiment of the present disclosure is a projection unit that emits projected light that is at least partially rotatable and forms at least one viewpoint image, and a condensing unit that collects the projected light. A diffuser that diffuses the projected light so that it is relatively narrowly diffused in the horizontal direction and relatively broadly diffused in the vertical direction, a detection unit that detects the viewpoint position of the observer, and at least one of the projection units. The unit is provided with a control unit that rotates and moves the unit to a position corresponding to the viewpoint position detected by the detection unit.

In the image display device according to the embodiment of the present disclosure, projected light forming at least one viewpoint image is emitted from a projection unit whose at least a part is rotatable and movable. The control unit rotates and moves at least a part of the projection unit to a position corresponding to the viewpoint position detected by the detection unit.

It is a block diagram which shows the outline of the image display device which concerns on a comparative example. It is a top view which shows typically one configuration example of the image display device which concerns on 1st Embodiment of this disclosure. It is a side sectional view which shows roughly one configuration example of the image display device which concerns on 1st Embodiment. It is explanatory drawing which shows an example of the appropriate light-diffusion distribution in the horizontal direction in the image display device which concerns on 1st Embodiment. It is explanatory drawing which shows an example of the characteristic parameter about the relationship between the observation distance and the viewpoint position in the image display device which concerns on 1st Embodiment. It is a characteristic figure which shows an example of the value of the main characteristic parameter when the optimum observation position is changed in the image display apparatus which concerns on 1st Embodiment. It is a characteristic figure which shows an example of the value of the main characteristic parameter when the horizontal diffusion angle is changed in the image display apparatus which concerns on 1st Embodiment. It is a top view which shows roughly the main part of one configuration example of the image display device which concerns on 2nd Embodiment. It is explanatory drawing which shows an example of the characteristic parameter about the relationship between the observation distance and the viewpoint position in the image display device which concerns on 2nd Embodiment. It is a characteristic diagram which shows an example of the relationship between the observation distance in the image display device which concerns on 2nd Embodiment, and the position of 1st and 2nd projector modules. It is a characteristic diagram which shows an example of the relationship between the observation distance in the image display device which concerns on 2nd Embodiment, and the interval of 1st and 2nd projector modules. It is a top view which shows roughly the main part of one configuration example of the image display device which concerns on 3rd Embodiment. It is a side sectional view which shows roughly the main part of one configuration example of the image display device which concerns on 3rd Embodiment. It is a characteristic diagram which shows an example of the relationship between the observation distance in the image display device which concerns on 3rd Embodiment, and the lens position of the lens for condensing position adjustment. It is a block diagram which shows typically the main part of one configuration example of the image display device which concerns on 4th Embodiment. It is explanatory drawing which shows typically the field-of-view range by the image display device which concerns on 4th Embodiment. It is a top view which shows roughly the main part of the image display device which concerns on 1st configuration example of 5th Embodiment. It is a top view which shows roughly the main part of the image display device which concerns on the 2nd configuration example of 5th Embodiment. It is a top view which shows the main part of the image display device which concerns on the 3rd configuration example of 5th Embodiment schematicly. It is a top view which shows typically one configuration example of the image display device which concerns on 6th Embodiment. 6 is a cross-sectional view schematically showing a configuration example of a transmissive cylindrical screen in the image display device according to the sixth embodiment. 6 is a cross-sectional view schematically showing an equivalent configuration example of a transmissive cylindrical screen in the image display device according to the sixth embodiment. It is a top view which shows typically one configuration example of the image display device which concerns on 7th Embodiment. It is a side sectional view which shows roughly one configuration example of the image display device which concerns on 7th Embodiment. It 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 image display device according to the first embodiment. FIG. 5 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 image display device according to the seventh embodiment. It is explanatory drawing which shows the outline of the incident light vector and the reflected light vector in the reflection plane of a reflection type plane screen. It is explanatory drawing which shows the outline of the incident light vector and the reflected light vector in the reflection plane of a reflection type plane screen. It is explanatory drawing which shows the outline of the incident light vector and the reflected light vector in the reflection plane of a reflection type plane screen. It is a top view which shows typically one configuration example of the image display device which concerns on 8th Embodiment. It is a side sectional view which shows roughly one configuration example of the image display device which concerns on 8th Embodiment. It is a top view which shows typically one configuration example of the image display device which concerns on 9th Embodiment. It is a side sectional view which shows roughly one configuration example of the image display device which concerns on 9th Embodiment. It is a top view which shows typically one configuration example of the image display device which concerns on tenth Embodiment. It is a side sectional view schematically showing one configuration example of the image display device according to the tenth embodiment. It is an external view which shows the outline of the image display device which concerns on 11th Embodiment. FIG. 5 is an external view schematically showing a main part of a configuration example of a video display device according to an eleventh embodiment. It is a side sectional view schematically showing one configuration example of the image display device according to the eleventh embodiment. FIG. 5 is a side sectional view schematically showing a first example of a projection state by a first projector unit in the image display device according to the eleventh embodiment. FIG. 5 is a side sectional view schematically showing a first example of a projection state by a second projector unit in the image display device according to the eleventh embodiment. FIG. 5 is a side sectional view schematically showing a second example of a projection state by a first projector unit in the image display device according to the eleventh embodiment. FIG. 5 is a side sectional view schematically showing a second example of a projection state by a second projector unit in the image display device according to the eleventh embodiment. FIG. 5 is an external view schematically showing a main part of a configuration example of a video display device according to an eleventh embodiment. FIG. 5 is a partial cross-sectional view schematically showing a main part of a configuration example of an image display device according to an eleventh embodiment. It is an exploded view which shows the main part of one configuration example of the image display device which concerns on eleventh embodiment. FIG. 5 is an external view schematically showing a main part of a configuration example of a video display device according to an eleventh embodiment. FIG. 5 is a plan view schematically showing a main part of a configuration example of an image display device according to an eleventh embodiment. FIG. 5 is an external view schematically showing a main part of a configuration example of a video display device according to an eleventh embodiment. It is explanatory drawing which shows schematic arrangement of the camera module in the image display device which concerns on eleventh embodiment. It is explanatory drawing which shows typically 1st example of the viewpoint position detection method in the image display device which concerns on 11th Embodiment. FIG. 5 is an explanatory diagram schematically showing a second example of a method of detecting a viewpoint position in a video display device according to an eleventh embodiment. FIG. 5 is a plan view schematically showing a first example of a linear drive mechanism of a projector unit in the image display device according to the eleventh embodiment. FIG. 5 is an external view schematically showing a first example of a linear drive mechanism of a projector unit in the image display device according to the eleventh embodiment. It is explanatory drawing which shows typically an example of the driving principle of an ultrasonic motor. It is explanatory drawing which shows roughly the relationship between the drive voltage of an ultrasonic motor and the displacement of a moving part. It is a top view which shows typically the 2nd example of the linear drive mechanism of the projector unit in the image display device which concerns on 11th Embodiment. It is explanatory drawing which shows typically an example of the driving principle of a stepping motor. It is explanatory drawing which shows typically an example of the driving principle of a stepping motor. It is an external view which shows the outline of the image display device which concerns on 12th Embodiment. It is an exploded view which shows the main part of one configuration example of the image display device which concerns on 12th Embodiments. It is a side sectional view which shows roughly the main part of one configuration example of the image display device which concerns on 12th Embodiment. It is explanatory drawing which shows typically the 1st example of the projection state by the image display device which concerns on 12th Embodiment. It is explanatory drawing which shows typically the 2nd example of the projection state by the image display device which concerns on 12th Embodiment. It is a block diagram which shows typically the 1st modification of the image display device which concerns on 12th Embodiment. It is a block diagram which shows typically the 2nd modification of the image display device which concerns on 12th Embodiment.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The explanation will be given in the following order.
1. 1. First Embodiment 1.0 Comparative Example (Fig. 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. 3. Third Embodiment (FIGS. 12-14)
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 unit) 12. Twelfth Embodiment (FIGS. 59 to 65)
13. Other embodiments

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

The image 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 an anisotropic diffusion characteristic arranged in a central portion. An image is projected from each projector 100 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 by a plurality of movable mirrors arranged in two dimensions. In this case, one projector 100 displays a two-dimensional image on the screen 200 by scanning the laser light source in two dimensions 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 a plurality of viewpoint images, projectors 100 for the number of viewpoints are required, which results 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 the individual projectors 100 are made smaller, it is difficult to reduce the size of the device as a whole.

[1.1 Configuration and operation of the video display device according to the first embodiment]
(Configuration of video display device)
FIG. 2 schematically shows an example of a configuration in which the image display device 1 according to the first embodiment of the present disclosure is viewed from the top surface. FIG. 3 schematically shows a configuration example of a lateral cross section of the image display device 1. In FIG. 2 and the like, the X-axis shows a horizontal direction, the Y-axis shows a vertical direction, and the Z-axis shows a direction orthogonal to the X-axis and the Y-axis. The same applies to the other figures showing the first embodiment described later and the figures shown in the other embodiments.

The image display device 1 includes a reflective cylindrical screen 2, a circular rail 3 arranged on the inner peripheral side of the reflective cylindrical screen 2, a first projector module Pj1 arranged on the rail 3, and a first projector module Pj1. It is provided with 2 projector modules Pj2. The image display device 1 further includes a rail 3, a housing 10 (FIG. 3) for accommodating the first projector module Pj1 and the second projector module Pj2.

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

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

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

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

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

The first and second projector modules Pj1 and Pj2 together constitute a "projection unit" in the technique of the present disclosure. For example, the first and second projector modules Pj1 and Pj2 can rotate and move on the rail 3 as a whole. The central axis of the circular rail 3 substantially coincides with the central axis C1 of the reflective cylindrical screen 2. 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 to rotate the first and second projector modules Pj1 and Pj2. You may let it. The circular rail 3 has a hollow center of rotation in which wiring can be arranged. The wiring referred to 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 "rotational drive mechanism unit" in the technique 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 the light from the laser light source. The first and second projector modules Pj1 and Pj2 can be configured by, 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 projected light that forms at least one viewpoint image. For example, the first projector module Pj1 emits the first projected light Lpj1 that forms the viewpoint image for the left eye 4L. Further, for example, the second projector module Pj2 emits the second projected light Lpj2 that forms the viewpoint image for the right eye 4R.

The image supply unit 13 supplies the first and second projector modules Pj1 and Pj2 with video signals corresponding to the viewpoint images for the left eye 4L and the right eye 4R, respectively.

The reflective cylindrical screen 2 is a diffusion member having an anisotropic diffusion characteristic in which the light diffusion characteristics differ between the horizontal direction and the vertical direction. The reflective cylindrical screen 2 has a cylindrical reflective surface on the inner peripheral surface. The cylindrical reflecting surface of the reflective cylindrical screen 2 acts as a condensing unit that collects the first and second projected 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 collects the first and second projected lights Lpj1 and Lpj2 toward the observer's viewpoint position on the cylindrical reflecting surface, and is relatively narrowly diffused in the horizontal direction and relative in the vertical direction. It spreads so that it becomes widespread.

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

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

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 unit 12, and the positions are appropriate according to the viewpoint position detected by the viewpoint position detection unit 11. Rotate and move on the rail 3. The first and second projector modules Pj1 and Pj2 rotate around 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 focused positions of the first and second projected lights Lpj1 and Lpj2 and the positions of the left eye 4L and the right eye 4R are substantially the same. .. As a result, the first projected light Lpj1 is focused toward, for example, the left eye 4L. The second projected light Lpj2 is focused toward, for example, the right eye 4R. As shown in FIG. 25 described later, 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 reflection surface of the reflective cylindrical screen 2 is constant. ..

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

In the reflective cylindrical screen 2, the first and second projected lights Lpj1 and 2 from the first and second projector modules Pj1 and Pj2 are used so that the viewpoint images are not mixed in the left eye 4L and the right eye 4. It is preferable to diffuse Lpj2 in the horizontal direction at an appropriate angle. For example, as shown in FIG. 4, in the reflective cylindrical screen 2, it is preferable to diffuse the first and second projected lights Lpj1 and Lpj2 so as to have a diffusion distribution close to a rectangle in the horizontal direction. By giving the reflective cylindrical screen 2 a diffusion distribution characteristic that makes the angle relatively narrow in the horizontal direction (X direction in FIG. 4), it is possible to prevent crosstalk caused by mixing the left and right viewpoint images. .. Further, by giving the reflective cylindrical screen 2 a diffusion distribution characteristic that makes the angle wider than the horizontal direction in the vertical direction (Y direction in FIG. 4), the viewpoint image can be observed from a wide angle in the vertical direction. It becomes possible to do.

(About the optimum observation position)
In the image display device 1, the cylindrical reflecting surface of the reflective cylindrical screen 2 is provided with a lens function as a condensing portion, and the focal position thereof is halved of the radius of the cylindrical reflecting surface. The first and second projector modules Pj1 and Pj2 are arranged, for example, at positions slightly deviated from the position of 1/2 of the radius of the cylindrical reflecting surface toward the central axis C1. The optimum observation position of the image 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 related to the relationship between the observation distance and the viewpoint position in the image display device 1. In FIG. 5, the meanings of the symbols are as follows.
Lcmax: Allowable crosstalk distance Lmax: Maximum allowable angle of view Lmin: Minimum allowable angle of view Lop: Optimal observation distance θconv: Ray angle between viewpoints θfov: Viewing angle (FOV (Field of View))
θd: Horizontal diffusion angle

FIG. 6 shows the main characteristic parameters (crosstalk allowable limit distance Lcmax, image chipping allowable maximum distance Lmax, and image chipping allowable minimum distance Lmin) when the optimum observation distance Lop (optimal observation position) is changed in the image display device 1. ) Is shown as an example. Further, FIG. 7 shows an example of the values of the same main characteristic parameters when the horizontal diffusion angle is changed in the image display device 1.

6 and 7 show values when the horizontal display size of the viewpoint image is 100 mm and the inter-eye distance is 65 mm. Further, FIG. 6 shows a value 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 the optimum observation position is changed is the distance range (Lmax-) between the maximum allowable image loss distance Lmax and the minimum allowable image loss distance Lmin. Lmin). Further, the distance range below the crosstalk allowable limit distance Lcmax is the distance range in which crosstalk does not occur. The values of the characteristic parameters shown in FIGS. 5 to 7 are determined by the conditions of use.

[1.2 Effect]
As described above, according to the image display device 1 according to the first embodiment, there are two viewpoints on the left and right from the projection units (first and second projector modules Pj1 and Pj2) that are rotatable and movable. Since the projected light that forms the image is emitted and the projection unit is rotated and moved to a position according to the viewpoint position, it is possible to display a three-dimensional image with high display quality in a wide range without increasing the size of the configuration. It will be possible.

It should be noted that the effects described in the present specification are merely examples and are not limited, and other effects may be obtained. The same applies to the effects of the other embodiments thereafter.

<2. Second Embodiment>
Next, the video display device according to the second embodiment of the present disclosure will be described. In the following, substantially the same parts as the components of the video display device according to the first embodiment will be designated by the same reference numerals, and description thereof will be omitted as appropriate.

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

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

On the other hand, in the image display device 1A according to the second embodiment, the first and second projector modules Pj1 and Pj2 are the first and second projector modules in the direction orthogonal to the rotational movement direction. The positions Zpj of Pj1 and Pj2 are variable. Further, the distance Xpj between the first and second projector modules Pj1 and Pj2 in the horizontal direction is variable. As a result, in the image display device 1A, the emission positions of the first and second projected lights Lpj1 and Lpj2 from the first and second projector modules Pj1 and Pj2 can be adjusted. As a result, the focusing positions (focus positions) of the first and second projected lights Lpj1 and Lpj2 can be adjusted.

In the image display device 1A according to the second embodiment, the viewpoint position detection unit 11 detects, for example, the viewpoint position in the observation distance direction in addition to the horizontal direction of the observer. The projector module position control unit 12 rotates the first and second projector modules Pj1 and Pj2 to positions corresponding to the horizontal viewpoint positions detected by the viewpoint position detection unit 11, and also rotates the viewpoint positions in the observation distance direction. The first and second projector modules Pj1 and Pj2 are moved to the positions corresponding to the above. As a result, in the projector module position control unit 12, the focusing positions of the first and second projected lights Lpj1 and Lpj2 are set to the positions corresponding to the viewpoint positions in the observation distance direction detected by the viewpoint position detection unit 11. The positions Zpj and the distance Xpj of the first and second projector modules Pj1 and Pj2 are controlled so as to be.

FIG. 9 shows an example of characteristic parameters related to the relationship between the observation distance Lo (observation position) and the viewpoint position in the image display device 1A. In FIG. 9, the same symbols are attached to the portions having the same meanings as those in FIG. FIG. 10 shows an example of the relationship between the observation distance Lo in the video display device 1A and the positions Zpj of the first and second projector modules Pj1 and Pj2. FIG. 11 shows an example of the relationship between the observation distance Lo in the video display device 1A and the distance Xpj between the first and second projector modules Pj1 and Pj2. As shown in FIG. 8, the value of the position Zpj in FIG. 10 is the position of the rotation center axis (the center axis C1 of the cylindrical reflection surface of the reflection type cylindrical screen 2) of the first and second projector modules Pj1 and Pj2. It is assumed that the value is set to "-100" and the value changes in the + direction as the distance from the central axis of rotation 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 that can be comfortably observed around the optimum observation position is limited. .. On the other hand, in the image display device 1A according to the second embodiment, the positions Zpj and the interval Xpj of the first and second projector modules Pj1 and Pj2 are optimized according to the viewpoint position in the observation distance direction. It is possible to comfortably observe in 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, the video display device according to the third embodiment of the present disclosure will be described. In the following, substantially the same parts as the components of the video display device according to the first or second embodiment will be designated by the same reference numerals, and description thereof will be omitted as appropriate.

FIG. 12 schematically shows a main part of a configuration example in which the image display device 1B according to the third embodiment is viewed from the upper surface. FIG. 13 schematically shows a main part of a configuration example of a lateral cross section of the image display device 1B.

In the image display device 1A according to the second embodiment, the positions Zpj and the interval Xpj of the first and second projector modules Pj1 and Pj2 are made variable so that the first and second projected lights Lpj1 and Lpj2 can be changed. The focusing position (focus position) of each of the above can be adjusted.

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

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

The focusing position adjusting lens 21 was emitted from the first and second projector modules Pj1 and Pj2 between the cylindrical reflecting surface of the reflective cylindrical screen 2 and the first and second projector modules Pj1 and Pj2. The first and second projected lights Lpj1 and Lpj2 are arranged on the optical path. The focusing position adjusting lens 21 is movable in a direction orthogonal to the rotational movement direction of the first and second projector modules Pj1 and Pj2. As a result, the focusing positions of the first and second projected lights Lpj1 and Lpj2 can be adjusted. Although FIG. 12 shows a configuration example in which the condensing position adjusting lens 21 is a concave lens, a configuration in which the condensing position adjusting lens 21 is a convex lens is also possible.

In the image display device 1B according to the third embodiment, the viewpoint position detection unit 11 detects the viewpoint position in the observation distance direction in addition to the horizontal direction of the observer, for example. The projector module position control unit 12 rotates the first and second projector modules Pj1 and Pj2 to positions corresponding to the horizontal viewpoint positions detected by the viewpoint position detection unit 11, and also rotates the viewpoint positions in the observation distance direction. The focusing position adjusting lens 21 is moved to a position corresponding to the above. As a result, in the projector module position control unit 12, the light collection positions of the first and second projected lights Lpj1 and Lpj2 are set to the positions corresponding to the viewpoint positions in the observation distance direction detected by the viewpoint position detection unit 11. The position of the focusing position adjusting lens 21 is controlled so as to be.

FIG. 14 shows an example of the relationship between the observation distance Lo (observation position) in the image display device 1B and the lens position of the focusing position adjusting lens 21. As shown in FIG. 12, the value of the lens position in FIG. 14 is the position of the rotation center axis (the center axis C1 of the cylindrical reflection surface of the reflection type cylindrical screen 2) of the first and second projector modules Pj1 and Pj2. It shall be the origin, and the value shall change in the-direction as the distance from the center axis of rotation increases. When the focusing position adjusting lens 21 is a concave lens, as shown in FIG. 14, for example, by moving the focusing position adjusting lens 21 away from the central axis of rotation, the observation distance Lo can be increased. 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, the video display device according to the fourth embodiment of the present disclosure will be described. In the following, substantially the same parts as the components of the video display device according to any one of the first to third embodiments are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

In the image display device according to the first to third embodiments, the case where the projected light forming one viewpoint image is emitted from the first and second projector modules Pj1 and Pj2, respectively, has been described. Projected light forming a plurality of viewpoint images may be emitted from the first and second projector modules Pj1 and Pj2, respectively.

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

FIG. 15 shows an example in which projected light forming three viewpoint images is emitted from the first and second projector modules Pj1 and Pj2, respectively. Further, FIG. 15 shows a configuration example when displaying a color image. It should be noted that the first and second projector modules Pj1 and Pj2 may be configured to emit projected light forming two viewpoint images or four or more viewpoint images, respectively.

For example, as shown in FIG. 15, the first and second projector modules Pj1 and Pj2, respectively, scan the viewpoint image by scanning a plurality of laser beams having different angles incident on a single scanning mirror. It may be a type projector.

In the image 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 a plurality of beams of R (red) color. The light source 30G is a laser light source that emits a plurality of G (green) color beams. 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 are each composed of, for example, an end face laser array or a VCSEL (Vertical Cavity Surface Emitting Laser). Note that FIG. 15 shows only a plurality of green beams (first projected light Lpj11, second projected light Lpj12, and third projected light Lpj13) from the light source 30G.

The dichroic prism 31 has a plurality of 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 a plurality of red beam optical paths incident on the first surface, a plurality of green beam optical paths incident on the second surface, and a plurality of blue beams incident on the third surface. A plurality of beams of each color are emitted from the fourth surface toward the scanning mirror 33 by combining with the optical path.

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

The scanning mirror 33 is, for example, a two-axis MEMS mirror capable of tilting the mirror surface around two axes. The scanning mirror 33 directs each of the plurality of beams of each color (first projected light Lpj11, second projected light Lpj12, and third projected light Lpj13) horizontally and vertically toward the inner surface of the reflective cylindrical screen 2. 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 projected light Lpj21, the second projected light Lpj22, and the third projected light Lpj23 is a reflective cylinder. It emits light in the horizontal direction and the vertical direction toward the inner surface of the screen 2.

FIG. 16 schematically shows the visual field range of the image display device 1C.

In the image display device 1C, the observer's left eye is formed by the first projected light Lpj11, the second projected light Lpj12, and the third projected light Lpj13 from the first projector module Pj1, for example, in the horizontal direction. Three viewpoint images are formed in different regions (first projection area Ar11, second projection area Ar12, and third projection area Ar13) near 4L. Further, by each of the first projected light Lpj21, the second projected light Lpj22, and the third projected light Lpj23 from the second projector module Pj2, for example, in the horizontal direction, each other in the vicinity of the observer's right eye 4R. Three viewpoint images are formed in different regions (first projection area Ar21, second projection area Ar22, and third projection area Ar23).

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

In the image display device according to the first to third embodiments, the stereoscopic image is displayed only by the viewpoint image of two viewpoints. At this time, the horizontal diffusion angles of the two projected lights forming the viewpoint images of the two viewpoints are set to, for example, the diffusion angles corresponding to the convergence angles of both eyes at the optimum observation position. In this case, even if the projection unit is operated so that the viewpoint position of the observer is detected and the two projected lights are focused on the binocular positions, the viewpoint position detection unit 11 causes a detection error and a tracking delay. The viewpoint image may not be displayed at the correct viewpoint position. To compensate for this, it is necessary to set a wide diffusion angle within the range where crosstalk does not matter. On the other hand, in the image display device 1C according to the fourth embodiment, instead of displaying the viewpoint image with a wide diffusion angle, the range of the convergence angles of both eyes, for example, from the first and second projector modules Pj1 and Pj2, respectively. By displaying a plurality of viewpoint images, it is possible to maintain an appropriate stereoscopic image display even if the viewpoint position moves slightly in the horizontal direction. In the image display device 1C according to the fourth embodiment, for example, in order to reduce the detection noise of the viewpoint position in the viewpoint position detection unit 11, the noise may be removed by filtering in the time direction. As a result, it is possible to reduce the error of the stereoscopic image display caused by the detection error or the like by detecting the viewpoint position only when the movement of the viewpoint position is slow to some extent.

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

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

In the video display device according to the first to fourth embodiments, a configuration example in the case where there is only one observer has been described, but projection is performed as in the configuration examples of FIGS. 17 to 19 described below. By providing a plurality of units, it is possible to display a stereoscopic image to a plurality of observers. In this case, the viewpoint position detection unit 11 detects each viewpoint position of the plurality of observers. Each of the plurality of projection units can rotate and move. The projector module position control unit 12 rotates and moves each of the plurality of projection units to a position corresponding to the viewpoint positions of different observers detected by the viewpoint position detection unit 11.

FIG. 17 schematically shows a main part of the image display device 1D-1 according to the first configuration example of the fifth embodiment as viewed from above. FIG. 18 schematically shows a main part of the image display device 1D-2 according to the second configuration example of the fifth embodiment as viewed from above. FIG. 19 schematically shows a main part of the image display device 1D-3 according to the third configuration example of the fifth embodiment as viewed from above.

The video display devices 1D-1, 1D-2, and 1D-3 according to the first to third configuration examples have three projection units (first projector unit PjA and second projector unit) as a plurality of projection units, respectively. It includes PjB and a third projector unit PjC). It should be noted that the configuration may include two or four or more projection units (projector units).

The first to third projector units PjA, PjB, and PjC are the first projector modules Pj1 and the second projector modules having substantially the same configuration as the image display device according to any one of the first to fourth embodiments, respectively. 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 arranged on the circumference of one rail 3, respectively. ing. The first to third projector units PjA, PjB, and PjC can rotate and move independently of each other on the circumference of one rail 3.

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

Similar to the video display device 1D-2 according to the second configuration example, the video display devices 1D-3 according to the third configuration example have diameters of each other instead of one rail 3 as shown in FIG. It is equipped with two rails 3A and 3B having 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 and arranged on different planes (different positions in the Y direction in FIG. 19). For example, the rail 3A is arranged in the plane including the paper surface of FIG. 19, and the rail 3B is arranged above or below the plane including the paper surface. Other configurations are the same as those of 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 unit" in the technique of the present disclosure.

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

<6. 6th Embodiment>
Next, the video display device according to the sixth embodiment of the present disclosure will be described. In the following, substantially the same parts as the components of the video display device according to any one of the first to fifth embodiments are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

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

The image display device 1E according to the sixth embodiment has a configuration in which the image display device 1 according to the first embodiment is provided with a transmissive cylindrical screen 2A instead of the reflective cylindrical screen 2. There is.

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

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

The transmissive cylindrical screen 2A is a diffusion member having an anisotropic diffusion characteristic in which the light diffusion characteristics differ between the horizontal direction and the vertical direction. As shown in FIG. 22, the transmissive cylindrical screen 2A has two lenticular lenses (first lenticular lens 41A and first lenticular lens 41A) having the same thickness as the focal lengths f1 and f2 on both sides (inner peripheral surface and outer peripheral surface). It has a cylindrical surface having a lens action equivalent to a structure in which the lenticular lenses 42A) of No. 2 are arranged so as to face each other.

The cylindrical surface of the transmissive cylindrical screen 2A acts as a condensing unit that collects the first and second projected 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 transmissive 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. The second HOE surface 42 acts as the second lenticular lens 42A shown in FIG. Optimal observation of the first and second projected lights Lpj1 and Lpj2 by adjusting the ratio of the focal lengths f1 and f2 of the first HOE surface 41 and the second HOE surface 42 of the transmissive cylindrical screen 2A. It can be focused at the position. Light diffusion that is relatively narrow in the horizontal direction and relatively wide in the vertical direction on both sides of the first HOE surface 41 and the second HOE surface 42 of the transmissive cylindrical screen 2A, or one of them. Characteristics are added. As a result, in the transmissive cylindrical screen 2A, the first and second projected lights Lpj1 and Lpj2 are condensed toward the observer's viewpoint position on the cylindrical surface, respectively, and are relatively narrowly diffused and vertical in the horizontal direction. It diffuses so that it spreads relatively widely in the direction.

In the sixth embodiment, the cylindrical surface of the transmissive cylindrical screen 2A corresponds to a specific example of the "condensing unit" in the technique 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.

(Modification example)
In the image display device according to the second to fifth embodiments, the reflective cylindrical screen 2 may be replaced with the transmissive cylindrical screen 2A.

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

FIG. 23 schematically shows a configuration example of the video display device 1F according to the seventh embodiment as viewed from above. FIG. 24 schematically shows a configuration example of a lateral cross section of the image display device 1F according to the seventh embodiment.

The image display device 1F according to the seventh embodiment provides the image display device 1 according to the first embodiment with a transparent cover 5 and a reflective flat screen 6 instead of the reflective cylindrical screen 2. It has a prepared structure.

The transparent cover 5 has a cylindrical shape, and is arranged at a position substantially similar to that of the reflective cylindrical screen 2 in the image display device 1 according to the first embodiment. The transparent cover 5 has substantially no lens action or light diffusing action, and may be omitted from the configuration.

The reflective flat screen 6 is arranged, for example, substantially near the center when viewed from the upper surface direction. The reflective flat screen 6 includes a reflective plane having a lens action equivalent to that of a Fresnel lens. The reflective flat screen 6 is composed of, for example, a flat reflective holographic optical element (HOE), and the reflective plane having a lens action is a HOE surface. In the image display device 1F, projected light is emitted from each of the first and second projector modules Pj1 and Pj2 toward the reflection plane of the reflection type flat screen 6. The HOE surface of the reflective flat screen 6 is provided with a light diffusion characteristic of relatively narrow diffusion in the horizontal direction and relatively wide diffusion in the vertical direction. As a result, in the reflective flat screen 6, the first and second projected lights Lpj1 and Lpj2 from the first and second projector modules Pj1 and Pj2 are focused on the reflection plane toward the observer's viewpoint position, respectively. At the same time, it diffuses so as to be relatively narrow diffusion in the horizontal direction and relatively wide diffusion in the vertical direction.

In the seventh embodiment, the reflective flat screen 6 corresponds to a specific example of the "diffusing member" in the technique of the present disclosure. In the seventh embodiment, the reflective plane of the reflective flat screen 6 corresponds to a specific example of the "condensing unit" in the technique of the present disclosure.

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

In the image display device 1 according to the first embodiment, as shown in FIG. 25, the first and second projector modules Pj1 and Pj2 have a constant projection elevation angle θ with respect to the cylindrical reflection surface of the reflection type cylindrical screen 2. It is preferable to rotate and move on such a plane.

Similarly, in the image 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 reflection plane of the reflection type flat screen 6 as shown in FIG. It is preferable to rotate and move on a plane that is constant.

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

When the reflective flat screen 6 is used, as shown in FIG. 26, it is rotationally moved on a flat surface inclined with respect to the vertical direction (Y axis). In this case, the inclination angle is set to 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 in the reflection plane (HOE plane) of the reflection type flat screen 6. K represents a hologram vector.

By injecting projected light from a plane at the same angle as the projected elevation angle θ with respect to the reflection plane of the reflective plane screen 6, the elevation angle with respect to the reflective plane screen 6 (in the YZ cross section of the incident light vector R). The angle) will be constant. As a result, the emission elevation angle (the angle of the reflected light vector S within 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, the video display device according to the eighth embodiment of the present disclosure will be described. In the following, substantially the same parts as the components of the video display device according to any one of the first to seventh embodiments will be designated by the same reference numerals, and the description thereof will be omitted as appropriate.

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

The image display device 1G according to the eighth embodiment includes a Fresnel lens rotating body 7 and a rotating stage 8 instead of the rail 3 with respect to the image display device 1 according to the first embodiment. Further, the image display device 1G has a rotation control unit 14 that controls the rotation angle of the Fresnel lens rotating body 7 instead of the projector module position control unit 12 with respect to the image display device 1 according to the first embodiment. I have.

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 technique of the present disclosure. In the eighth embodiment, the rotation control unit 14 corresponds to a specific example of the "control unit" in the technique of the present disclosure.

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

The first and second projected lights Lpj1 and Lpj2 emitted from the first and second projector modules Pj1 and Pj2 are observed by the cylindrical reflecting surface of the reflective cylindrical screen 2 after passing through the Fresnel lens rotating body 7, respectively. It is focused toward the viewpoint position of the person. In the image display device 1G, the Fresnel lens rotating body 7 rotates instead of the first and second projector modules Pj1 and Pj2 rotating, so that the focusing positions of the first and second projected lights Lpj1 and Lpj2 are focused. Approximately matches the viewpoint position of the observer.

The rotation control unit 14 controls the rotation stage 8 so that the rotation angle of the Fresnel lens rotating body 7 is an angle corresponding 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, the video display device according to the ninth embodiment of the present disclosure will be described. In the following, substantially the same parts as the components of the video display device according to any one of the first to eighth embodiments will be designated by the same reference numerals, and the description thereof will be omitted as appropriate.

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

The image display device 1H according to the ninth embodiment uses a reflective eccentric Fresnel lens rotating body 9 instead of the rail 3 with respect to the image display device 1E (FIG. 20) according to the sixth embodiment. I have. Further, the image display device 1H controls the rotation angle of the reflective eccentric Frenel lens rotating body 9 instead of the projector module position control unit 12 with respect to the image display device 1E according to the sixth embodiment. The control unit 15 is provided.

In the ninth embodiment, the first projector module Pj1 and 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 technique of the present disclosure. .. In the ninth embodiment, the rotation control unit 15 corresponds to a specific example of the "control unit" in the technique of the present disclosure.

The reflective eccentric Fresnel lens rotating body 9 is arranged at a position on the top surface of the transmissive cylindrical screen 2A so as to be rotatable and movable. The rotation center axis of the reflective eccentric Fresnel lens rotating body 9 substantially coincides with the center axis C1 of the transmissive cylindrical screen 2A. The first and second projector modules Pj1 and Pj2 are arranged at substantially the center position when viewed from the upper surface direction.

The first and second projected lights Lpj1 and Lpj2 emitted from the first and second projector modules Pj1 and Pj2 are each reflected by the reflective eccentric Fresnel lens rotating body 9, and then the cylinder of the transmissive cylindrical screen 2A. The surface is focused toward the observer's viewpoint position. In the image display device 1H, instead of the first and second projector modules Pj1 and Pj2 rotating, the reflective eccentric Fresnel lens rotating body 9 rotates, so that the first and second projected lights Lpj1 and Lpj2 The light-collecting position of is approximately the same as the viewpoint position of the observer.

The rotation control unit 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 detecting 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.

<10. Tenth Embodiment>
Next, the video display device according to the tenth embodiment of the present disclosure will be described. In the following, substantially the same parts as the components of the video display device according to any one of the first to ninth embodiments are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

FIG. 34 schematically shows a configuration example of the video display device 1I according to the tenth embodiment as viewed from above. FIG. 35 schematically shows a configuration example of a lateral cross section of the image display device 1I according to the tenth embodiment.

The image display device 1I according to the tenth embodiment is a transmissive eccentric Fresnel lens rotating body 9A instead of the rail 3 with respect to the image display device 1E (FIG. 20) according to the sixth embodiment. , A reflection mirror 22 is provided. Further, the image display device 1I rotates the image display device 1E according to the sixth embodiment to control the rotation angle of the transmissive eccentric Fresnel lens rotating body 9A instead of the projector module position control unit 12. It includes a control unit 15.

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

The transmissive eccentric Fresnel lens rotating body 9A is arranged at a position on the lower surface and the bottom surface of the transmissive cylindrical screen 2A, and is rotatable and movable. The rotation central axis of the transmissive eccentric Fresnel lens rotating body 9A substantially coincides with the central axis C1 of the transmissive cylindrical screen 2A. The reflection mirror 22 is arranged on an optical path between the transmissive eccentric Fresnel lens rotating body 9A and the first and second projector modules Pj1 and Pj2.

The first and second projected lights Lpj1 and Lpj2 emitted from the first and second projector modules Pj1 and Pj2 are each reflected by the reflection mirror 22 and then transmitted through the transmissive eccentric Fresnel lens rotating body 9A. .. The first and second projected lights Lpj1 and Lpj2 transmitted through the transmissive eccentric Fresnel lens rotating body 9A are focused toward the observer's viewpoint position by the cylindrical surface of the transmissive cylindrical screen 2A, respectively. In the image display device 1I, instead of the first and second projector modules Pj1 and Pj2 rotating, the transmissive eccentric Fresnel lens rotating body 9A rotates, so that the first and second projected lights Lpj1 and Lpj2 The focusing position of the light is approximately the same as the viewpoint position of the observer.

The rotation control unit 15 controls the rotation angle of the transmissive eccentric Fresnel lens rotating body 9A so as to have an angle corresponding to the viewpoint position detected by the viewpoint position detecting 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, the video display device according to the eleventh embodiment of the present disclosure will be described. In the following, substantially the same parts as the components of the video display device according to any one of the first to tenth embodiments will be designated by the same reference numerals, and the description thereof will be omitted as appropriate.

[11.1 Overview]
FIG. 36 shows an outline of the appearance of the 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 lateral cross section of the image display device 1J.

The image display device 1J according to the eleventh embodiment includes a transmissive cylindrical screen 2A similar to the image display device 1E (FIG. 20) according to the sixth embodiment. Further, the image display device 1J is capable of displaying a stereoscopic image to a plurality of observers by providing a plurality of projection units as in the image display device according to the fifth embodiment. There is. Similar to the video display device according to the fifth embodiment, the video display device 1J detects the viewpoint positions of each of the plurality of observers by the viewpoint position detection unit 11. Each of the plurality of projection units can rotate and move. The projector module position control unit 12 rotates and moves each of the plurality of projection units to a position corresponding to the viewpoint positions of different observers detected by the viewpoint position detection unit 11.

The image display device 1J includes two projection units (first projector unit PjA and second projector unit PjB) as a plurality of projection units. The image display device 1J includes two turntables 50A and 50B corresponding to the two rails 3A and 3B in the image display device 1D-3 (FIG. 19) according to the third configuration example of the fifth embodiment. There is. The first projector unit PjA is arranged on the turntable 50A. The second projector unit PjB is arranged on the turntable 50B. Although the projection unit is shown in FIG. 36 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 unit cannot be seen from the outside.

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

The turntables 50A and 50B have different diameters and are stacked on different planes (different positions in the Y direction in FIG. 36). For example, the turntable 50A has a larger diameter than the turntable 50B and is arranged on the upper side. As a result, the turntables 50A and 50B can rotate independently of each other. In the image display device 1J, by rotating each of the turntables 50A and 50B, it is possible to rotate and move 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 linear drive mechanism units 70 and 80, and are in directions orthogonal to the rotational movement direction on the turntables 50A and 50B, respectively. It is possible to move linearly in the (observation distance direction). As a result, in the image display device 1J, the emission positions of the projected light from the first and second projector units PjA and PjB can be adjusted. As a result, the focusing position (focus position) of the projected light from the first and second projector units PjA and PjB can be adjusted.

In the projector module position control unit 12, the rotation positions of the first and second projector units PjA and PjB are positioned according to the horizontal viewpoint position of the observer detected by the viewpoint position detection unit 11. The turntables 50A and 50B are rotationally moved. Further, in the projector module position control unit 12, the positions of the first and second projector units PjA and PjB in the observation distance direction are set to the viewpoint positions in the observation distance direction of the observer detected by the viewpoint position detection unit 11. The linear drive mechanism units 70 and 80 linearly move the first and second projector units PjA and PjB so as to be in the corresponding positions.

The viewpoint position detection unit 11 includes a fine adjustment camera module 51 and a coarse adjustment camera module 52. The fine adjustment camera module 51 and the coarse adjustment camera module 52 each detect the viewpoint position of the observer, but the detection ranges are different from each other as described later.

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

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

As shown in FIG. 37, the fine adjustment camera module 51 is incorporated in, for example, the first and second projector units PjA and PjB together with the first and second projector units PjA and PjB, respectively. Although FIG. 37 shows an example in which the fine adjustment camera module 51 is arranged between the first and second projector units PjA and PjB, the first and second projector units PjA and PjB and the fine adjustment are shown. 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 (for example, 2 to 4) camera modules 52 for coarse adjustment are provided on the outer periphery of the housing 10, for example. The coarse adjustment camera module 52 roughly adjusts, for example, how many people are around the image display device 1J, and the fine adjustment camera module 51 makes rough adjustments for which person the viewpoint position should be detected.

The rotation center axes of the turntables 50A and 50B substantially coincide with the center axis C1 of the transmissive cylindrical screen 2A. As shown in FIG. 38, the turntables 50A and 50B each have a hollow portion 61 in which the wiring 62 can be arranged at the center of rotation. The wiring 62 includes, for example, electrical wiring and optical communication wiring connected to the first and second projector units PjA and PjB, respectively.

When a DC (direct current) motor is arranged at the center of rotation as a mechanism for rotationally driving the turntables 50A and 50B, the electricity of the first and second projector units PjA and PjB installed on the turntables 50A and 50B. The place where the wiring 62 such as the wiring and the optical communication wiring is passed is configured to pass the gap with the case on the outer peripheral portion. In that case, it goes without saying that the wiring 62 is twisted as it rotates, but the distance that rubs the circumference becomes long and the possibility that the wiring is broken increases. Also, the twisting very limits the angle at which it can rotate.

However, when the turntables 50A and 50B are hollow drive mechanisms that do not have a rotation axis near the center, the rotation angle can be greatly rotated to several laps or more because the rotation twist can be minimized. It becomes possible. Then, since the load of rotation can be reduced, high-speed rotation becomes possible and durability is improved. Further, as in the image display device 1K (FIGS. 59 to 65) according to the twelfth embodiment described later, the projection unit can be arranged in the hollow portion, which increases the degree of freedom in optical design. For example, as in the image display device 1K (FIGS. 59 to 65) according to the twelfth embodiment described later, a structure using an omnidirectional lens 310 is also possible.

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

As shown in FIGS. 39 and 40, the projected 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. The observer can observe the stereoscopic image in the first and second projection areas Ar1 and Ar2. The fine adjustment camera module 51 can detect the viewpoint position of the observer within the range of the shooting area Arω (shooting angle of view) which is substantially the same as the first and second projection areas Ar1 and Ar2.

In the turntables 50A and 50B, respectively, on the opposite side (opposite side) of the first and second projector units PjA and PjB, a shape marker for detecting the viewpoint position by the fine adjustment camera module 51 is used. Aiming devices 91A and 91B may be provided.

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

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

(Structure example of rotation drive mechanism)
43 and 44 schematically show a main part of a configuration example of the video display device 1J. FIG. 45 schematically shows a main part of a configuration example of the image display device 1J in a disassembled state. FIG. 46 schematically shows a main part of a configuration example of the video display device 1J. In addition, in FIGS. 43 to 46, as in the configuration example shown in FIGS. 41 and 42, when the projected light from the first and second projector units PjA and PjB is reflected by the reflection mirror 23 and projected. A configuration example of is shown.

As shown in FIGS. 43 to 46, the rotation drive mechanism unit is composed of, for example, a ring type ultrasonic motor.

As shown in FIGS. 43 to 46, ring-type ultrasonic motors having different sizes are arranged below the turntables 50A and 50B, respectively, and drive 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 the first and second projector units PjA and PjB are connected from the central hollow portion 61 to the lower system circuit portion and power supply portion (not shown).

47 and 48 show a modified example of the rotation drive mechanism unit in the image display device 1J. FIG. 47 schematically shows a plan configuration example of the rotation drive mechanism unit according to the modified example. FIG. 48 schematically shows an external configuration example of the rotation drive mechanism unit according to the modified example.

As shown in FIGS. 47 and 48, the rotation drive mechanism unit may be configured to include a gear drive type motor arranged on the outer circumference. 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 peripheral portions of the turntables 50A and 50B, respectively. May be good. The drive side gear 54 may be driven by the DC motor 55. The turntable side gear 53 may be driven by the DC motor 55 via the drive side gear 54.

When the turntables 50A and 50B are rotationally driven according to the viewpoint position of the observer, the ring-type ultrasonic motor has a short start-up time and reversal time, and can quickly follow the observer's detailed and quick behavior. Become. On the other hand, the gear-driven motor arranged on the outer circumference has a long start-up time and reversal time, but it is possible to follow a movement in which the observer keeps moving fast in a certain direction at a high speed. A motor that corresponds to the expected movement of the observer may be selected. In addition, although the structure becomes complicated, by using both of these two motors, it is possible to follow both small and quick movements and movements that continue to move quickly in a certain direction.

[11.2 Perspective position detection method]
FIG. 49 schematically shows the arrangement of the fine adjustment camera module 51 and the coarse adjustment camera module 52 in the image display device 1J. The fine adjustment camera module 51 incorporated in each of the first and second projector units PjA and PjB enables independent detection of the viewpoint position in each of the first and second projector units PjA and PjB. 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.

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

A plurality of coarse adjustment camera modules 52 are provided on the outer periphery of the housing 10 of the image 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 the projected light can be projected. The plurality of coarse adjustment camera modules 52 detect the viewpoint position, for example, around substantially the entire circumference of the transmissive cylindrical screen 2A and around 360 °.

Conventionally, a coarse adjustment camera such as that used in the coarse adjustment camera module 52 has been used as various human recognition techniques. However, there is a problem that the spatial resolution of the small camera module is low and the position with the projected image cannot be accurately controlled. Therefore, the fine adjustment camera module 51 is arranged on the turntables 50A and 50B together with the first and second projector modules Pj1 and Pj2 for projecting an image. As a result, the fine adjustment camera module 51 rotates and moves at the same time as the image, so that the detection accuracy of the viewpoint position and the accuracy of the position adjustment of the first and second projector modules Pj1 and Pj2 according to the viewpoint position can be improved. can.

In the image display device 1J, since the observer's viewpoint position can be roughly grasped by the coarse adjustment camera module 52, after roughly tracking the viewpoint position, the fine adjustment camera module 51 can be used within a narrow range. The viewpoint position should be grasped in detail. As a result, the viewing angle of the detection lens system in the fine adjustment camera module 51 can be narrowed. As an effect, the resolution per pixel can be finely controlled in order to capture only the area near the observer's face and eyes.

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

From the first and second projector modules Pj1 and Pj2, the first and second detection markers Ir1 and Ir2 are emitted from the first and second projected lights Lpj1 and Lpj2, respectively. As a result, for example, as shown in FIG. 50, the first and second detection markers Ir1 and Ir2 are drawn in the vertical direction. The wavelengths used as the first and second detection markers Ir1 and Ir2 are preferably near infrared, but are not limited to near infrared.

The fine adjustment camera module 51 detects the projection 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 projected position 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. Is shown. FIG. 50B shows an example in which the projection positions of the first and second detection markers Ir1 and Ir2 coincide with both eyes of the observer. 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 is, for example, based on the difference between the projected position of the first and second detection markers Ir1 and Ir2 and the position of the observer's eye, for example, the first and second projector units PjA and PjB. The turntables 50A and 50B are rotationally moved so that the respective rotation positions of the above are the positions corresponding to the detected horizontal viewpoint positions 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, in each of the first and second projector modules Pj1 and Pj2, by adding, for example, a near-infrared light source to the three-color light source, the viewpoint position can be detected in the direction perpendicular to a part of the viewpoint image. The first and second detection markers Ir1 and Ir2 are included and emitted. In this case, the fine adjustment camera module 51 is configured to include a detection element having sensitivity to visible light and sensitivity to near infrared light, thereby detecting the first and second detection markers Ir1 and Ir2. The fine adjustment camera module 51 also has visible light sensitivity, so that the positions of the observer's face and eyes and the positions of the first and second near-infrared detection markers Ir1 and Ir2 can be detected at the same time. The projector module position control unit 12 rotates the turntables 50A and 50B so that, for example, the positions of the first and second detection markers Ir1 and Ir2 coincide with 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 enables highly accurate tracking. If the fine adjustment camera module 51 is on the turntables 50A and 50B, it does not have to be integrated with the first and second projector units PjA and PjB.

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

The image display device 1J may further include a shape marker that rotates and moves together with the projection unit. The fine-tuning camera module 51 may be capable of detecting the position of the shape marker with respect to the observer and the position of the observer's eyes. The projector module position control unit 12 may rotate the projector 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.

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

The fine adjustment camera module 51 detects the aiming reference position 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. 51 (A) 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 in which the aiming reference position 91C and both eyes of the observer coincide with each other. FIG. 51 (C) shows an example in which the aiming reference position 91C is shifted to the left side 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 of FIG. 50, it is not necessary to include the detection marker in the projected image. For example, a shape marker such as a convex portion is arranged as a structure at a position facing the fine adjustment camera module 51 on the turntables 50A and 50B, and a position extended above the shape marker (aiming reference position 91C). 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 that generates a detection marker as in the first detection method becomes unnecessary, and the configuration is inexpensive.

[11.3 Example of linear drive mechanism of projector unit (projection unit)]
In the image display device 1J, linear drive mechanism units 70 and 80 are provided on both sides of the first and second projector units PjA and PjB. As a result, the first and second projector units PjA and PjB can move linearly in a direction orthogonal to the rotational movement direction (observation distance direction). As a result, the focusing position (focus position) of the projected light from the first and second projector units PjA and PjB can be adjusted. The linear drive mechanism units 70 and 80 may be configured to 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 the linear drive mechanism of the first and second projector units PjA and PjB in the image display device 1J. FIG. 52 shows a plan configuration example. FIG. 53 shows an example of external configuration.

The linear drive mechanism 70 has 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 piezo piezoelectric element 77. You may.

The linear drive mechanism unit 80 may have 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 unit 70 and the shaft 81 of the linear drive mechanism unit 80, respectively. The linear drive mechanism unit 70 includes an ultrasonic motor. The weight 76 is a weight having a heavy specific gravity for receiving the vibration of the piezo piezoelectric element 77, which is a vibration source. A laminated piezo piezoelectric element 77 is bonded to the tip of the weight 76. At the tip of the piezo piezoelectric element 77, there is a shaft 71 for transmitting a driving force by a saw vibration waveform, and bearings 74 formed on the first and second projector units PjA and PjB respectively transmit the movement of the shaft 71. Take it. A pressurization 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 the ultrasonic motor. FIG. 55 schematically shows the relationship between the drive voltage (drive waveform) of the ultrasonic motor and the displacement of the moving portion. The positions (A), (B), and (C) of the drive waveform of FIG. 55 correspond to the states of (A), (B), and (C) of FIG. 54.

When the linear drive mechanism unit 80 is not driven, the first and second projector units PjA and PjB are held at their linear positions ((A) in FIG. 54). When sawtooth-driven as shown in FIG. 55, the first and second projector units PjA and PjB slide in the direction in which the slope of the waveform is standing and follow the direction in which the slope of the waveform is sleeping. Will move in one direction, respectively ((B), (C) in FIG. 54). The direct-acting ultrasonic motor has a short start-up time and reversal time, and can quickly follow the observer's detailed and quick behavior.

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

The linear drive mechanism unit 70 has a configuration including 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. You may.

The linear drive mechanism unit 80 may have 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 unit 70 and the lead screw 78 of the linear drive mechanism unit 80, respectively. The teeth of the lead screw 78 mesh with the teeth of the toothed pressurization spring 75A. As a result, by rotating the lead screw 78 by the stepping motor 79, the first and second projector units PjA and PjB joined to the toothed pressurization spring 75A can be linearly moved.

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 in which a plurality of coils L1, L2, L3, and L4 are wound, and a rotor composed of magnets. The rotor is rotatably arranged in the center of the inner peripheral side of the stator.

The rotation angle of the rotor is determined by which of the plurality of coils L1, L2, L3, and L4 the current is passed. FIG. 57 shows a state in which a current is passed through the coil L1. In this case, the coil L1 becomes an electromagnet (for example, S pole), and one end (for example, N pole) of the central rotor is attracted by the magnetic force of the coil L1 to rotate, and stops at a position facing the coil L1. Further, FIG. 58 shows a state in which a current is passed through the coil L2. In this case, the coil L2 becomes an electromagnet (for example, S pole), and one end (for example, N pole) of the central rotor is attracted by the magnetic force of the coil L2 and rotates, and stops at a position facing the coil L2. 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 the stator.

(Other linear drive mechanisms)
Further, as the linear drive mechanism, a rack and pinion type DC motor may be used. In the case of a rack-and-pinion type DC motor, the start-up time and the reversal time are long, but it is possible to follow a movement in which the observer keeps moving fast in a certain direction at a high speed. A linear drive mechanism using a stepping motor has intermediate performance between two characteristics, a linear drive mechanism using a rack and pinion type DC motor and a linear drive mechanism using an ultrasonic motor. A motor that corresponds to the expected movement of the observer may be selected. In addition, although the structure becomes complicated, by using two different methods in combination, it is possible to follow a movement that continues to move quickly in a certain direction even for a small and quick movement.

Other configurations, operations and effects include the video display device 1 according to the first embodiment, the video display device according to the fifth embodiment, or the video display device 1E according to the sixth embodiment. And so on.

<12. 12th Embodiment>
Next, the video display device according to the twelfth embodiment of the present disclosure will be described. In the following, substantially the same parts as the components of the video display device according to any one of the first to eleventh embodiments will be designated by the same reference numerals, and description thereof will be omitted as appropriate.

FIG. 59 shows an outline of the appearance of the 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 lateral cross section of the image display device 1K. FIG. 62 schematically shows a first example of the projection state by the image display device 1K. FIG. 63 schematically shows a second example of the projection state by the image display device 1K.

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

The image display device 1K includes an omnidirectional lens 310 arranged at the bottom of the transmissive cylindrical screen 2A. The upper part of the omnidirectional lens 310 is a reflective surface 311.

Further, the image display device 1K includes a reflection unit 313 arranged below the omnidirectional lens 310. The central portion of the upper part of the housing 10 and the central portion of the reflective portion 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 so as to emit the first and second projected lights Lpj1 and Lpj2 toward the reflecting surface 311 of the omnidirectional lens 310. In the hollow portion 320, the relay lens 321 may be arranged on the optical paths of the first and second projected lights Lpj1 and Lpj2.

The first projector unit PjA is arranged in the hollow portion 320 so as to be rotatable and movable over the entire circumference by a rotation drive mechanism such as a ring type ultrasonic motor. Further, the first projector unit PjA includes a linear drive mechanism having the same configuration as the image display device 1J according to the eleventh embodiment, and linearly moves in the vertical direction (Y direction in FIGS. 59 to 63). It is possible.

In the image display device 1K, as shown in FIGS. 61 to 63, the first and second projected lights Lpj1 and Lpj2 from the first projector unit PjA are reflected by the reflecting surface 311 on the upper part of the omnidirectional lens 310. After that, it is further reflected by the reflecting surface 312 of the reflecting portion 313 arranged in the lower part of the omnidirectional lens 310. The first and second projected lights Lpj1 and Lpj2 reflected by the reflecting surface 312 are emitted toward the cylindrical surface of the transmissive cylindrical screen 2A via the omnidirectional lens 310. By rotating the first projector unit PjA over the entire circumference, projection images 330 by the first and second projected lights Lpj1 and Lpj2 are formed on the reflecting surface 312 over the entire circumference. The projected image 330 formed on the reflecting surface 312 is observed by the observer via the omnidirectional lens 310 and the transmissive cylindrical screen 2A. This allows the observer to observe the projected image 330 over the entire circumference of the transmissive cylindrical screen 2A. 62 and 63 schematically show the projection state by the image display device 1K when the observers are at different positions.

(Modification 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 reflecting portion 313 are not limited to the shapes shown in FIGS. 59 to 63. Further, the omnidirectional lens 310 and the reflecting portion 313 may be formed of separate members. For example, as shown in FIG. 64, the omnidirectional lens 310A having a different outer diameter may be provided with respect to the reflecting portion 313. Further, as shown in FIG. 65, the configuration may include a reflecting portion 313A having a linear cross section of the reflecting surface 312.

Further, the omnidirectional lens 310 is not limited to a configuration in which the inside is entirely filled with a glass material or a transparent resin material, and may have a configuration 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 technique according to the present disclosure is not limited to the description of each of the above embodiments, and various modifications can be implemented.

For example, the present technology may have the following configuration. According to this technology having the following configuration, it is possible to display a multi-view video with high display quality in a wide range without increasing the size of the configuration.

(1)
A projection unit that emits projected light that is at least partially rotatable and forms at least one viewpoint image.
A condensing unit that collects the projected light and
A diffusion member that diffuses the projected light so that it is relatively narrowly diffused in the horizontal direction and relatively broadly diffused in the vertical direction.
A detector that detects the viewpoint position of the observer,
An image display device including a control unit that rotates and moves at least a part of the projection unit to a position corresponding to the viewpoint position detected by the detection unit.
(2)
The image display device according to (1) above, wherein at least a part of the projection unit rotates and moves so that the projection elevation angle with respect to the diffusion member is constant.
(3)
The projection unit can adjust the condensing position of the projected light.
The image according to (1) or (2) above, wherein the control unit controls the projection unit so that the condensing position of the projected light is a position corresponding to the viewpoint position detected by the detection unit. Display device.
(4)
The image display device according to any one of (1) to (3) above, wherein the diffusion member diffuses the projected light so as to have a diffusion distribution close to a rectangle in the horizontal direction.
(5)
The image display device according to any one of (1) to (4) above, wherein the projection unit emits projected light that forms three or more viewpoint images.
(6)
A plurality of the projection units are provided, and the detection unit can detect the respective viewpoint positions of the plurality of observers.
At least a part of each of the plurality of projection units is rotatable and movable.
The control unit rotates and moves at least a part of each of the plurality of projection units to a position corresponding to the viewpoint position of a different observer detected by the detection unit. The image display device according to one.
(7)
The image display device according to any one of (1) to (6) above, wherein the light collecting unit includes a reflective holographic optical element formed on a cylindrical surface.
(8)
One of the above (1) to (6), the condensing portion includes a cylindrical surface having a lens action equivalent to a structure in which two lenticular lenses having the same thickness as each focal length are arranged so as to face each other on both sides. The video display device described in.
(9)
The image display device according to any one of (1) to (6) above, wherein the condensing unit includes a flat surface having a lens action equivalent to that of a Fresnel lens.
(10)
The image display device according to any one of (1) to (8) above, wherein the projection unit includes a Fresnel lens that can be rotated and moved.
(11)
The image display device according to any one of (1) to (8) above, wherein the projection unit includes an eccentric Fresnel lens that is rotatable and movable.
(12)
A rotation drive mechanism unit, in which the center of rotation is hollow in which wiring can be placed and the projection unit is rotationally moved.
The image display device according to any one of (1) to (6) above.
(13)
The video display device according to (12) above, wherein the wiring includes an electrical wiring and an optical communication wiring connected to the projection unit.
(14)
Each of the plurality of projection units is arranged on different planes or on different circumferences so that at least a part of them can rotate and move independently of each other.
The control unit rotates and moves at least a part of each of the plurality of projection units independently of each other to a position corresponding to the viewpoint position of a different observer detected by the detection unit (6). The video display device described.
(15)
The image display device according to (12) or (13) above, wherein the rotation drive mechanism unit includes a ring type ultrasonic motor or a gear drive type motor arranged on the outer circumference.
(16)
The projection unit includes a linear-acting ultrasonic motor or a stepping motor, and the condensing position of the projected light can be adjusted by linearly moving by the linear-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 unit includes first and second detection units having different detection ranges from each other.
(18)
The detection range of the first detection unit is at least a part of the range in which the projected 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 projected light can be projected.
(19)
The projection unit emits projected light including a detection marker.
The first detection unit can detect the projection position of the detection marker and the position of the observer's eye.
The image according to (17) or (18) above, wherein the control unit rotates and moves at least a part of the projection unit based on the difference between the projection position of the detection marker and the eye position of the observer. Display device.
(20)
A shape marker that rotates with at least a part of the projection unit is further provided.
The first detection unit can detect 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 part 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 eye of the observer according to the above (17) or (18). Video display device.

This application claims priority on the basis of Japanese Patent Application No. 2018-205353 filed at the Japan Patent Office on October 31, 2018, and the entire contents of this application are referred to in this application. Incorporate for application.

One of ordinary skill in the art can conceive of various modifications, combinations, sub-combinations, and changes, depending on design requirements and other factors, which are included in the appended claims and their equivalents. It is understood that it is something to be done.

Claims (20)

A projection unit that emits projected light that is at least partially rotatable and forms at least one viewpoint image.
A condensing unit that collects the projected light and
A diffusion member that diffuses the projected light so that it is relatively narrowly diffused in the horizontal direction and relatively broadly diffused in the vertical direction.
A detector that detects the viewpoint position of the observer,
An image display device including a control unit that rotates and moves at least a part of the projection unit to a position corresponding to the viewpoint position detected by the detection unit. The image display device according to claim 1, wherein at least a part of the projection unit rotates and moves so that the projection elevation angle with respect to the diffusion member is constant. The projection unit can adjust the condensing position of the projected light.
The image display device according to claim 1, wherein the control unit controls the projection unit so that the condensing position of the projected light is a position corresponding to the viewpoint position detected by the detection unit. The image display device according to claim 1, wherein the diffusion member diffuses the projected light so as to have a diffusion distribution close to a rectangle in the horizontal direction. The image display device according to claim 1, wherein the projection unit emits projected light that forms three or more viewpoint images. A plurality of the projection units are provided, and the detection unit can detect the respective viewpoint positions of the plurality of observers.
At least a part of each of the plurality of projection units is rotatable and movable.
The image display device according to claim 1, wherein the control unit rotates and moves at least a part of each of the plurality of projection units to a position corresponding to a viewpoint position of a different observer detected by the detection unit. The image display device according to claim 1, wherein the light collecting unit includes a reflective holographic optical element formed on a cylindrical surface. The image display device according to claim 1, wherein the condensing unit includes a cylindrical surface having a lens action equivalent to a structure in which two lenticular lenses having the same thickness as each focal length are arranged so as to face each other on both sides. The image display device according to claim 1, wherein the condensing unit includes a flat surface having a lens action equivalent to that of a Fresnel lens. The projection unit is an image display device including a Fresnel lens that can be rotated and moved. The image display device according to claim 1, wherein the projection unit includes an eccentric Fresnel lens that is rotatable and movable. A rotation drive mechanism unit, in which the center of rotation is hollow in which wiring can be placed and the projection unit is rotationally moved.
The video display device according to claim 1. The video display device according to claim 12, wherein the wiring includes an electrical wiring and an optical communication wiring connected to the projection unit. Each of the plurality of projection units is arranged on different planes or on different circumferences so that at least a part of them can rotate and move independently of each other.
The sixth aspect of claim 6, wherein the control unit rotates and moves at least a part of each of the plurality of projection units independently of each other to a position corresponding to a viewpoint position of a different observer detected by the detection unit. Video display device. The image display device according to claim 12, wherein the rotation drive mechanism unit includes a ring type ultrasonic motor or a gear drive type motor arranged on the outer circumference. The projection unit includes a linear-acting ultrasonic motor or a stepping motor, and the condensing position of the projected light can be adjusted by linearly moving by the linear-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 unit includes first and second detection units having different detection ranges from each other. The detection range of the first detection unit is at least a part of the range in which the projected light is actually projected.
The image display device according to claim 17, wherein the detection range of the second detection unit includes the entire range in which the projected light can be projected. The projection unit emits projected light including a detection marker.
The first detection unit can detect the projection position of the detection marker and the position of the observer's eye.
The image display device according to claim 17, wherein the control unit rotates and moves at least a part of the projection unit based on the difference between the projection position of the detection marker and the eye position of the observer. A shape marker that rotates with at least a part of the projection unit is further provided.
The first detection unit can detect the position of the shape marker with respect to the observer and the position of the observer's eyes.
The image display device according to claim 17, wherein the control unit rotates and moves at least a part 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 eye of the observer.

Images