JP2005114771A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of easily displaying a stereoscopic image. <P>SOLUTION: The display device 10 is equipped with a light emitting unit capable of rotating around a rotary shaft 15, and a screen 11 arranged around the light emitting unit and having shape which forms at least a part of an axially symmetric rotating body on the rotary shaft 15, for example, cylindrical shape, and a light emitting part whose light radiation angle is limited to a prescribed range is arranged on the side of the light emitting unit opposed to the screen 11. By providing many light emitting parts where many directions 19A to 19X different from each other are set as their light radiation directions, rotating the light emitting unit around the rotary shaft 15 so as to rotate the light emitting parts to perform scanning, and also modulating the emitted light quantities of the light emitting parts according to given information, the image is displayed in the display device 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a display device that displays a stereoscopic image, and in particular, it is possible to observe from a wide range, for example, 360 degrees around the circumference, and it is possible to observe a stereoscopic image with a large number of people without glasses. It can be done.

  Three-dimensional image display methods that are currently in practical use or researched and developed are roughly classified into three types depending on the method.

The first is to express stereoscopic effect using parallax information, and is classified as a multi-viewpoint image reproduction method. Typical examples include a binocular stereo stereoscopic method, a parallax barrier method, a lenticular lens method, and an illumination light source division method.
A feature of these methods is that two or more plane images are viewed with the left and right eyes so that the plane images are recognized as stereoscopic images.

The second is called an optical wavefront reproduction method, and a typical method is holography.
The reproduction by holography is reproduced as it is by reproducing the phase wavefront of the light beam from the object irradiated with the laser. Therefore, when the observer swings his / her face up / down / left / right / front / back, the stereoscopic image to be observed changes continuously.

In addition, as a method that does not use laser phase wavefront reproduction in the light wavefront reproduction system, there is a light beam reproduction method. Light ray reproduction is a display method based on the idea that light in various directions at an actual three-dimensional space position is displayed as a set of light rays (see, for example, Patent Literature 1 to Patent Literature 3).
Such a display method is the same as holography, and it is natural that images with parallax can be presented to both eyes (two eyes), and motion parallax accompanying the movement of the observer can be reproduced (multiple eyes). Furthermore, if the display pitch in the direction of the light beam is made fine enough to allow multiple light beams to enter the observer's pupil, it corresponds to sampling the light beam from the object at fine intervals (super multi-view), and the display image You can focus on.

The third is called a volume scanning method. In this method, a point sequence desired to be displayed in a three-dimensional space for displaying an image is illuminated.
However, since only a point sequence on a flat surface or one curved surface can be lit and displayed at a certain moment, a method of illuminating the display surface by parallel translation or rotation has been developed.
This method has advantages such as a wide viewing zone and simple video display.
JP-A-5-273675 JP 7-318858 A JP-A-5-191838

  However, in any of the above-described systems, sufficient performance as a practical stereoscopic image recording / reproducing apparatus has not been obtained.

  First, the first method, that is, the multi-viewpoint image reproduction method, looks three-dimensionally visually but does not actually reproduce a three-dimensional image. This is only a typical 3D image reproduction.

In the second method, that is, the optical wavefront reproduction method, the holography method requires a coherent light source having high coherence such as a laser to perform recording at least, and special materials for recording and reproduction are also used. Film is required.
In addition, since the amount of information required is extremely large, for example, if display is performed using liquid crystal or the like, a very large number of minute pixels are required, and there are many technical problems.

  Further, in the third method, that is, the volume scanning method, it is difficult to increase the number of spatial display points. Therefore, even if it is easy to apply to CG (computer graphics), the correspondence to the real map is not possible. Have difficulty.

  Therefore, at present, no display device or system for displaying a stereoscopic image that is practically used has been realized.

  In order to solve the above-described problems, the present invention provides a display device that can easily display a stereoscopic image.

  The display device of the present invention comprises at least one light emitting unit that is rotatable around a rotation axis, and a screen that is arranged around the light emitting unit and forms at least a part of a rotating body that is axisymmetric about the rotation axis. A light emitting unit whose light emission angle is limited to a predetermined range is arranged on the side of the light emitting unit facing the screen, and a plurality of directions different from each other are used as a light emission direction of each light emitting unit. A light emitting unit is provided, the light emitting unit rotates around the rotation axis, the light emitting unit is rotated and scanned, and the amount of light emitted from the light emitting unit is modulated according to the given information, thereby displaying an image. .

  In the display device of the present invention, at least two directions which are in a plane substantially perpendicular to the rotation axis or in substantially the same conical plane with the rotation axis as the central axis are different from each other in the light of each light emitting unit. The light emitting unit group is configured by a plurality of light emitting units, and at least one or more of the light emitting unit groups are provided.

  In the display device of the present invention, it is also possible to adopt a configuration in which the rotation axis is in the vertical direction, and the light emitting unit is supported on a column that is erected in the vertical direction and includes the rotation axis.

  In the display device of the present invention, the screen may have a substantially cylindrical shape, and the radiation direction of each light emitting unit may be in a plane substantially perpendicular to the rotation axis.

In the display device of the present invention, each light emitting unit may be provided with data for reproducing a light beam emitted from an object as information, so that a stereoscopic image is displayed on the screen. It is.
Furthermore, the same data is given to each light emitting unit as information, a planar image is displayed on the screen, and the display of the stereoscopic image and the display of the planar image can be switched for each area of the screen. It is also possible.

According to the configuration of the display device of the present invention described above, since the light emitting unit is rotated and scanned by the rotation of the light emitting unit, an image is displayed on the screen that is arranged around the light emitting unit and forms at least a part of the rotating body. can do. Thereby, for example, a wide range of image display such as 360.degree. Can be performed.
In addition, since the amount of light emitted from the light emitting unit is modulated according to the given information, if the given information is changed, not only a still image but also a moving image can be displayed.
And since the radiation angle of the light of a light emission part is restrict | limited to the predetermined range, the spreading | diffusion of the light radiated | emitted from a light emission part is restrict | limited, and it collects centering on a certain radiation direction. As a result, light from the light emitting unit can be observed only from a predetermined angle direction, so that light emitted from the light emitting unit can be used as a light beam for light beam reproduction. .
In addition, since a plurality of light emitting units are provided in which at least two directions different from each other are set as the light emission directions of the light emitting units, the light beams in two or more directions are rotated when the light emitting unit is rotationally scanned. Radiate. By using the light beams in these two or more directions and setting them to correspond to the images for displaying the information to be given to each light emitting section, and modulating the light emission quantity of each light emitting section, a three-dimensional image is obtained by the light beam reproduction method. Can be displayed.

  In the display device of the present invention, at least two directions which are in a plane substantially perpendicular to the rotation axis or in substantially the same conical plane with the rotation axis as the central axis are different from each other in the light of each light emitting unit. When the light emitting unit group is configured by a plurality of light emitting units, the light emitting units of the same light emitting unit group are substantially perpendicular to the rotation axis when the light emitting units are rotationally scanned. On a surface that is substantially parallel to the scanning direction, a light beam having a direction in which there are two or more in-plane components is emitted. By using the light beams in these two or more directions and setting them to correspond to the images for displaying the information to be given to each light emitting section, and modulating the light emission quantity of each light emitting section, a three-dimensional image is obtained by the light beam reproduction method. Can be displayed. At this time, the stereoscopic image is displayed in a direction substantially parallel to the scanning direction of the light emitting unit, and is not a stereoscopic image in a direction substantially perpendicular to the scanning direction of the light emitting unit, for example, scattered light.

  Further, in the display device of the present invention, when the rotation axis is in the vertical direction and the light emitting unit is supported by the column that is erected in the vertical direction and includes the rotation axis, The display device can be easily configured by arranging the light emitting unit of the structure. In addition, since the scanning direction is horizontal, the arrangement is suitable for a normal observer, that is, an observer standing or sitting.

  In the display device of the present invention, when the screen has a substantially cylindrical shape and the radiation direction of each light emitting portion is in a plane substantially perpendicular to the rotation axis, the screen is substantially cylindrical, When displayed on the display, the same image can be displayed in a wide range such as 360 °. Further, since the emission direction of each light emitting unit is in a plane substantially perpendicular to the rotation axis (for example, in the horizontal plane if the rotation axis is the vertical direction), the design of the light emitting unit is facilitated.

In the display device of the present invention, each light emitting unit is provided with data for reproducing light rays emitted from an object as information, and a stereoscopic image is displayed on the screen. A three-dimensional image can be displayed on the screen by a light beam reproduction method in a direction substantially parallel to the scanning direction of the light emitting unit.
Further, the same data is given to each light emitting unit as information, a planar image is displayed on the screen, and the display of the stereoscopic image and the display of the planar image can be switched for each area of the screen. In some cases, in a display device capable of displaying in a wide range, both planar image display and stereoscopic image display can be combined.

According to the above-described display device of the present invention, it is possible to display a stereoscopic image in a wide range such as 360.degree. This makes it possible to observe a stereoscopic image without a pair of glasses with a large number of people.
Therefore, according to the present invention, a stereoscopic image can be easily displayed, and a practical stereoscopic image display apparatus can be configured.

  The display device of the present invention can be widely applied in many fields such as movies, advertisements, and decorations. Besides, it is optimal as a display device for various simulations such as medical use.

Prior to specific embodiments of the present invention, an outline of the present invention will be described.
The display device of the present invention employs the light beam reproduction method of the light wavefront reproduction methods described above.

First, the principle of the light beam reproduction method employed in the present invention will be described.
FIG. 6A illustrates the state of observing an object.
As shown in FIG. 6A, the light beams L1A, L2A, L1B, and L2B scattered from the objects 101 and 102 enter the observer's eyes 103A and 103B, respectively, so that the objects 101 and 102 can be recognized.

Here, it is assumed that the screen is arranged at a position 104 indicated by a dotted line in FIG. 6A.
At this time, FIG. 6B shows a diagram in which the lights L1A, L2A, L1B, and L2B entering the eyes 103A and 103B from the objects 101 and 102 in FIG. 6A are reproduced at the screen position 104.
If the same light rays L1A, L2A, L1B, and L2B are incident on the observer's eyes 103A and 103B from the screen position 104 can be reproduced as in FIG. 6A. In addition, an object can be seen behind the screen 104.

Therefore, the light having the same emission spectrum and intensity as in FIG. 6B is irradiated from the screen position 104 toward the eyes 103A and 103B of the observer. The state is shown in FIG. 7A.
In the state shown in FIG. 7A, light sources A, B, C,... G, H that emit light at different angles and small slits (openings) The screen 111 is formed.
For example, light in the “F” direction is emitted from the “ha” slit toward the left eye 103 </ b> A. From the “ho” slit, the “H” direction light is directed toward the right eye 103B, and from the “to” slit, the “D” direction light is directed toward the left eye 103A. From the slit, light in the “G” direction is emitted toward the right eye 103B.
Then, if all the light entering the pupils of the eyes 103A and 103B from the objects 101 and 102 is reproduced by the method shown in FIG. 7A, the observer's eyes 103A and 103B have exactly the same light rays L1A, L1A, as shown in FIG. L1B, L2A, and L2B are incident, and the objects 101 and 102 can be observed as a stereoscopic image.
A method for forming a stereoscopic image in this way is called a light beam reproduction method.

In FIG. 7B, light emission similar to that in FIG. 7A is realized by scanning the light emitting unit. When light sources A, B, C... G, H that emit light in different angular directions are scanned laterally (horizontal direction) on the rear side of the screen 111, and each comes to a predetermined position. And emit light with a predetermined spectrum and intensity.
For example, as shown in FIG. 8, the light source A emits light with a predetermined spectrum and intensity when it reaches the opening “”. As a result, the light enters the observer's left eye 103A through the opening “O”. Although the light source of B is not shown, when it comes to the opening of “Nu”, it emits light with a predetermined spectrum and intensity and enters the left eye 103A of the observer through the opening of “Nu”.

The state of FIG. 6A and the state of FIG. 7B are different from FIG. 6A in that continuous light emission is performed, but FIG. 7B is in intermittent light emission. If the scanning speed is increased, the images seen in FIGS. 6A and 7B are the same.
Based on such a principle, it is possible to realize a display device that reproduces light rays entering an eye from an object.

  In the description of FIGS. 7A, 7B, and 8, the principle of the screen 111 is described by providing a slit (opening) such as “Iroro ... wa waka” on the screen 111. The term “opening” means an area that transmits optical light. If the light can be transmitted through the screen, it is not necessary to actually provide a slit-like cut in the screen.

  Subsequently, an embodiment of the display device of the present invention that realizes the principle of FIG. 7B is shown in FIG. FIG. 1A shows a plan view and FIG. 1B shows a perspective view.

As shown in FIG. 1A and FIG. 1B, the display device 10 includes a screen 11 arranged in a cylindrical shape, and a support column 14 including a rotation shaft (rotation center) 15 in the screen 11, and a support column 14. The arm 12 is provided with a radially extending arm 12 and a light emitting panel 13 attached to the tip of the arm 12.
The light emitting panel 13 includes a light source (light emitting unit) disposed on the screen 11 side. And the light emission unit is comprised by the light emission panel 13 and the arm 12 containing a light source.

Then, by rotating the arm 12 around the rotation axis 15, the light source of the light emitting panel 13 rotates along the screen 11, and the light source is scanned in parallel with the screen 11. By controlling each light source to emit light with a predetermined spectrum and intensity when the light source reaches a predetermined position in accordance with this scanning, a stereoscopic image can be displayed by light beam reproduction.
In FIG. 7B and FIG. 8, since the light source was scanned with respect to the flat screen 111, a three-dimensional image was observed in front of the flat screen 111, but in this embodiment, with respect to the cylindrical screen 11 Since the light source is scanned, a stereoscopic image can be observed from a very wide range of 360 ° around the screen 11.

Next, FIG. 2 shows an embodiment of a light emitting unit in which a plurality of light sources (light emitting units) are arranged on the light emitting panel 13 at the tip of the arm 12.
As shown in FIG. 2, the first light source 16 and the second light source 17 are coupled at the tip emission portion to form a light source unit 18, and this light source unit 18 is composed of the light emitting panel 13 at the tip of the arm 12. Are arranged in two different directions.
Thereby, the light source which inject | emits light at the angle of 4 directions which is each different in the light emission panel 13 is arrange | positioned, and each light emission unit 20A, 20B, 20C is comprised.
The three light emitting units 20A, 20B, and 20C are configured so that the direction in which light is emitted from the light source of each light emitting unit is slightly different from the other light emitting units. Thereby, by providing these light emitting units 20A, 20B, and 20C, light can be emitted in 12 directions from 12 light sources.

Next, FIG. 3 shows a state in which an optical unit having a configuration in which four light sources are provided as in the light emitting units 20A, 20B, and 20C shown in FIG. 2 is incorporated in the display device 10 shown in FIG.
In FIG. 3, six optical units are provided, and there are light sources that emit light in four different directions at the tip of the arm 12 of each optical unit, for a total of 24 different directions (angles) 19A, Light beams are emitted to 19B, 19C,..., 19W, 19X. Note that, when viewed from the rotating shaft 15 side (inner side), the leftmost ray is 19A, and the rightmost ray is 19X.
Note that the light source in this case can also be configured in the same manner as the light source unit 18 shown in FIG. 2 in which the first light source 16 and the second light source 17 are combined at the tip emission portion. The angle formed by the two light sources is substantially a right angle in FIG. 2, but in this case, it is an acute angle.

Various light sources (light emitting units) of the light emitting panel 13 can be used. For example, lasers or LEDs (light emitting diodes) can be used.
For example, the first light source 16 and the second light source 17 shown in FIG. 2 may be configured by combining these light sources and optical fibers.

  It is desirable that the rotation frequency of the light emitting unit be set to such an extent that the image does not flicker, for example 60 Hz to 180 Hz.

  Further, in order to realize the light beam reproduction method, the emission of light from one light source is limited to a somewhat narrow range so that it is not scattered light and emitted in a specific direction. For example, the emission range can be limited by using an optical fiber or by covering the light emitting material with a cylindrical cover or a louvered cover.

  With this configuration, the light source that emits light in the 24 directions 19A to 19X is rotationally scanned, and the observer can see a stereoscopic image corresponding to the angular components in the 24 directions during one rotation. become.

However, the display device 10 according to the present embodiment can reproduce a stereoscopic image with light beams in the horizontal direction (horizontal direction), and does not emit different light beams in the vertical direction (vertical direction) from the light source. The direction (vertical direction) is scattered light.
Therefore, for example, even when the eyes are moved up and down, the observed stereoscopic image is the same.

  Thus, in order to emit light beams having different directions in the horizontal direction (horizontal direction) and to make scattered light in the vertical direction (vertical direction), for example, as the screen 11, light is emitted only in the vertical direction (vertical direction). A diffusing screen having a diffusing specification may be used. As such a screen 11, for example, a hologram sheet manufactured by POC of the United States is suitable.

  By configuring the display device 10 as described above, the number of light sources and the amount of information compared to a display device having a light source so as to emit light in different directions in the vertical direction (vertical direction) as well. Can be suppressed, and a practical stereoscopic image can be displayed.

When the angle component is very small, the number of pixels in the same direction increases and the boundary of the change in the emission direction becomes conspicuous. Therefore, it is desirable that the angle component is as large as possible.
The angle component can be increased by further increasing the number of arms and the number of light source units. More preferably, it is configured to have an angle component of 100 or more, and further, an angle component of several hundred or more.
If the angle component is increased, the light beam to be reproduced becomes more accurate and high-definition, and it is possible to realize a display device with a high presence.

Further, in the display device 10 of the present embodiment, when the horizontal direction (horizontal direction) is also set to normal diffused light, a normal image (2D image) is obtained. If the image signal supplied to the light source is changed, the lateral direction (horizontal direction) can be changed to diffused light in this way.
If such an image signal and an image signal for displaying a stereoscopic image are switched, a 2D image and a stereoscopic image can be switched and displayed. For example, it is possible to switch for each area of the screen 11.

  Further, by devising the image signal supplied to the light source, it is possible to make the image different if the viewing direction is different.

  In FIG. 3, the light emitting units are configured to emit light in 24 different directions, but a plurality of light emitting units in the same emitting direction are provided as a whole, and a plurality of light amounts of images in the same direction are emitted. It is also possible to configure it to be shared by the parts.

According to the configuration of the display device 10 of the present embodiment described above, the light source disposed on the light-emitting panel 13 at the tip of the light-emitting unit is rotated and scanned by the rotation of the light-emitting unit, so that the cylindrical screen 11 is rotated all around 360 °. It is possible to display a wide range of images.
In addition, the light emission direction from the light source is limited, that is, the light emission angle is limited to a predetermined range, so that the light from the light source can be observed only from the predetermined angle direction. The light can be used as a light beam for light beam reproduction.

Further, the light source is configured to emit light in 24 different directions in the horizontal direction, that is, the scanning direction of the light source, so that the light from the object is specifically reproduced so as to correspond to the image to be displayed. If the information given to each light source is modulated as described above, a stereoscopic image can be displayed by the light beam reproduction method in the scanning direction of the light source.
At this time, in the vertical direction, that is, in a direction substantially perpendicular to the scanning direction of the light source, it is not a three-dimensional image but scattered light, so that it is possible to suppress an increase in the amount of information.

  Thereby, there are various advantages such as, for example, that it is possible to display a stereoscopic image of a moving image and to increase the speed of displaying a stereoscopic image.

  Further, in the present embodiment, the rotation shaft 15 is in the vertical direction, and the light emitting unit is erected in the vertical direction and is supported by the column portion 14 including the rotation shaft. Can be configured. In addition, since the scanning direction is horizontal, the arrangement is suitable for a normal observer, that is, an observer standing or sitting. Moreover, since the radiation direction of each light source is in a horizontal plane, the design of the light source is easy.

Therefore, a stereoscopic image can be easily displayed, and a practical stereoscopic image display apparatus can be configured.
The display device 10 having the above-described configuration can be widely applied in many fields such as movies, advertisements, and decorations. In addition, it is most suitable as a display device for various simulations such as medical use.

By the way, in the above-described embodiment, the light emission direction of each light emitting unit is configured on the premise that it is in a substantially horizontal plane, that is, in a plane substantially perpendicular to the rotation axis. However, the present invention is not limited to the case where the light emission direction of the portion is in a plane substantially perpendicular to the rotation axis, and includes the case where the light from the light emitting portion is emitted obliquely with respect to the rotation axis.
For a light emitting unit that emits in an oblique direction with respect to the rotation axis, if a plurality of light emitting units are arranged so that there is an emission direction in a conical surface with the rotation axis as a central axis, a light emitting unit group is configured. Since the components in the plane (substantially parallel to the scanning direction of the light emitting unit) in the emission direction of the plurality of light emitting units constituting the group are different, a stereoscopic image is displayed in the scanning direction of the light emitting unit. Is possible. In this case, since a stereoscopic image is displayed in the scanning direction, it is possible to suppress an increase in the amount of information.

  In the present invention, the light emitting unit group may further include a plurality of light emitting unit groups. In that case, each light emitting unit group may have a configuration in which the angle formed between the emission direction of the light emitting unit and the rotation axis is the same as the rotation axis. Any configuration with different angles is possible.

Further, the configuration of the light emitting unit is not limited to the configuration illustrated in FIGS. 1 to 3, and various other configurations are possible.
The number of arms may be any number as long as it is one or more.
There may be one or more light emitting units. However, if the number of light emitting units is large, there is an advantage that the number of light sources that can be mounted is increased.
In particular, when importance is attached to the balance during rotation, it is desirable that there are a plurality of arms.

As another embodiment of the display device of the present invention, FIG. 4 shows a schematic configuration diagram (plan view) of a display device having a single light emitting unit.
The display device 30 includes a cylindrical screen 11 as in the display device 10 of FIG.

In the present embodiment, only one light emitting unit is provided.
A light emitting panel 23 having a circular arc cross section is supported by two arms 22 extending from the support column 24, and a large number of light sources 21 having different emission directions are provided on the surface of the light emitting unit 23 on the screen 11 side. If the number of light emitting units is small, the number of light sources that can be mounted decreases, but in this embodiment, the light emitting panel 23 is made wider by that amount.

  And the light emission unit which consists of the light emission panel 23 and the arm 22 rotates centering on the rotating shaft 25 in the support | pillar 24, the light source 21 is rotationally scanned, and similarly to the display apparatus 10 of previous embodiment, A stereoscopic image can be displayed by the light beam reproduction method.

  Therefore, according to the display device 30 of the present embodiment, a stereoscopic image can be easily displayed as in the display device 10 of FIG.

Further, in each of the above-described embodiments, the screen is formed on the cylindrical side surface. However, the shape of the screen may be a shape of a rotating body with the rotation axis of the light emitting unit as a central axis. .
For example, the screen may be formed in a spherical shape. The case is shown below.

As still another embodiment of the display device of the present invention, a schematic configuration diagram (perspective view) of a display device having a spherical screen configuration is shown in FIG.
The display device 40 is configured by providing a spherical screen 41 around a support 42.
Then, as indicated by the arrows in the figure, by scanning the light source (not shown) in the horizontal direction (horizontal direction), a stereoscopic image is displayed by the light beam reproduction method as in the above-described embodiments. Is something that can be done.

  In the present embodiment, the optical unit can be configured in the same manner as the above-described embodiments in the planar shape, but corresponds to the inner surface of the spherical screen 41 because the distance from the rotation axis changes in the vertical direction. The optical unit is configured as described above.

  In the present embodiment, for example, the vertical component of the light source emission direction is changed between the upper part and the central part of the sphere, that is, the angle formed between the emission direction of the light emitting part and the rotation axis described above. A configuration having a plurality of different light emitting unit groups is also possible.

  In each of the above-described embodiments, the stereoscopic image can be observed over the entire 360 ° circumference. However, in the present invention, for example, a part of the rotating body is embedded in a column or a wall. Also, there is a configuration in which the display is not performed, and the remaining portion (for example, 180 ° portion, 270 ° portion, 300 ° portion, etc.) is used as a screen, and a stereoscopic image is displayed within the range. Is included.

Further, in each of the above-described embodiments, in order to display a stereoscopic image in the scanning direction of the light emitting unit, it is in a plane substantially perpendicular to the rotation axis, or in substantially the same conical surface with the rotation axis as the central axis, In addition, it is premised on a configuration having a plurality of light emitting units (light emitting unit groups) in which at least two directions different from each other are set as the light emission directions of the light emitting units.
The present invention further includes a configuration in which the plurality of light emitting units have two or more arbitrary directions of light emission.
In this case as well, it is possible to display a stereoscopic image in a wide range such as 360 ° all around, and select the emission direction of the light emitting unit and correspondingly reproduce the light from the object. By modulating the information given to the three-dimensional image, it is possible to display a three-dimensional image by the light beam reproduction method in a direction other than the scanning direction of the light emitting unit (for example, a direction perpendicular to the scanning direction).
Further, the amount of information can be suppressed as compared with the optical wavefront reproduction method based on the holography method.

  The present invention is not limited to the above-described embodiment, and various other configurations can be taken without departing from the gist of the present invention.

A, B It is a schematic block diagram of one Embodiment of the display apparatus of this invention. It is a figure which shows one form of a structure of the light emission unit of the display apparatus of FIG. It is a figure which shows one form of the emission of the light in the display apparatus of FIG. It is a schematic block diagram (top view) of other embodiment of the display apparatus of this invention. It is a schematic block diagram of further another embodiment of the display apparatus of this invention. A, B It is a figure for demonstrating the principle which displays the three-dimensional image in the display apparatus of this invention. A, B It is a figure for demonstrating the principle which displays the three-dimensional image in the display apparatus of this invention. It is a figure for demonstrating the principle which displays the stereo image in the display apparatus of this invention.

Explanation of symbols

10, 30, 40 display device, 11, 41 screen, 12 arm, 13 light emitting panel, 16 first light emitter, 17 second light emitter, 18 light source unit, 20A, 20B, 20C light emitting unit

Claims (6)

At least one light emitting unit rotatable around a rotation axis;
A screen that is disposed around the light emitting unit and that forms at least part of a rotational body that is axisymmetric about the rotational axis;
On the side of the light emitting unit facing the screen, a light emitting unit in which the light emission angle is limited to a predetermined range is disposed,
A plurality of the light emitting units are provided in which at least two directions different from each other are set as the light emitting directions of the light emitting units,
The light-emitting unit rotates around the rotation axis, the light-emitting unit is rotated and scanned, and the amount of light emitted from the light-emitting unit is modulated according to given information to display an image. Display device.   The light emission direction of each light emitting unit is in a plane substantially perpendicular to the rotation axis, or in substantially the same conical surface with the rotation axis as a central axis, and at least two different directions. The display device according to claim 1, wherein a plurality of light emitting units constitute a light emitting unit group, and at least one light emitting unit group is provided.   The display device according to claim 1, wherein the rotation shaft is in a vertical direction, and the light emitting unit is supported on a support column which is erected in the vertical direction and includes the rotation shaft.   The display device according to claim 1, wherein the screen has a substantially cylindrical shape, and the radiation direction of each light emitting unit is in a plane substantially perpendicular to the rotation axis.   2. The display device according to claim 1, wherein each of the light emitting units is provided with data for reproducing a light beam emitted from an object as the information, and a stereoscopic image is displayed on the screen. .   The same data is given to each of the light emitting units as the information, and a planar image is displayed on the screen. The display of the stereoscopic image and the display of the planar image can be switched for each area of the screen. The display device according to claim 5.

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