JP2013073229A - Display device, and method of driving the same - Google Patents

Abstract

A display device capable of moving and displaying an aerial image in the depth direction with one display body and a driving method thereof are provided.
A display device according to the present invention includes a projector that projects an image, a spiral screen that displays a projection image projected from the projector, and a projection image that is projected on the screen. An image means and a rotating means for rotating the central axis of the screen are provided, and the distance between the projection surface of the screen and the image forming means is continuously changed.
[Selection] Figure 1

Description

  The present invention relates to a display device and a driving method thereof.

There are the following proposals as devices and systems for presenting information on the direction of guidance with a guide light (Patent Documents 1 and 2).
In Patent Document 1, it is proposed to display another pattern from the back of the guide light and present information so that the evacuees do not face the fire direction. Further, Patent Document 2 proposes a device that indicates a guide direction by displaying a safe entrance / exit direction with a guide light in the event of a disaster with an arrow, or scanning and displaying an arrow mark with a laser beam on a wall surface of a corridor. .

JP 2009-277545 A Japanese Patent Laid-Open No. 2001-1000067

  However, in any of the above proposals, it is impossible to present the blame direction in an easy-to-understand manner when viewing the blame display from the front in the passage. In addition, a method of guiding the blame direction by sequentially rolling a plurality of guide lights in cooperation with each other has been proposed, but in order to operate a plurality of physically separated guide lights in a coordinated manner, wiring is not routed. There is a problem that it is difficult and time-consuming.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a display device capable of moving and displaying an aerial image in the depth direction with one display body and a driving method thereof. It is one.

  The display device according to the present invention includes a projector that projects an image, a spiral-shaped screen that displays a projection image projected from the projector, and an imaging unit that projects and forms a projection image displayed on the screen in space. And a rotating means for rotating the central axis of the screen, wherein the distance between the projection surface of the screen and the imaging means is continuously changed.

  According to this configuration, the display position of the aerial image can be changed in the optical axis direction by adopting a configuration in which the distance between the projection surface of the screen and the imaging unit is continuously changed.

  The display device of the present invention includes a projector that projects an image, a screen that displays a projection image projected from the projector, a rotating unit that rotates a central axis of the screen, and a projection image that is displayed on the screen. An image forming means for forming an image in a space, and the screen has a parallel plane divided into a plurality when viewed from the central axis direction, and the projection surface of the screen and the image forming means The distance is discretely changed.

  According to this, the display position of the aerial image can be changed in the optical axis direction by adopting a configuration in which the distance between the projection surface of the screen and the imaging unit is discretely changed.

  An angle detection unit that detects a rotation angle of the central axis of the screen; a switching unit that sets a timing for switching a display signal based on an output of the angle detection unit; and a plurality of images set in advance by an output of the switching unit It is good also as a structure provided with the signal generation means which switches and outputs a signal.

  According to this, since the signal to be displayed is switched depending on the rotation angle of the rotation axis of the screen, the display signal to be displayed on the screen corresponding to the position where the aerial image is formed, regardless of the rotation speed of the rotation axis. By switching, different display patterns can be displayed while changing the display position.

  Further, a driving method in which a focus control unit or a zoom control unit is provided between the angle detection unit and the projector may be employed.

  According to this, when the focus control means is provided, the optimum focus is always obtained regardless of the position where the aerial image is formed by linking the focus control unit as the rotation angle of the central axis of the screen changes. It becomes possible to. In addition, when a zoom control means is provided, the zoom control means is interlocked as the rotation angle of the central axis of the screen changes, so that an optimum focus is always obtained regardless of the position where an aerial image is formed. Is possible.

  Further, the plurality of parallel planes arranged in the direction of the central axis may be arranged at different positions sequentially around the central axis by a predetermined angle.

  According to this, since the parallel planes divided by the predetermined angle around the central axis when viewed from the central axis direction (optical axis direction) are arranged at different positions in the central axis direction, the display position is The display can be switched while being moved discretely.

  Further, the center axis of the screen may be inclined with respect to the optical axis of the projection light emitted from the projector.

  According to this, since the inclination of the projection surface of the screen with respect to the optical axis can be reduced, display distortion and the like are eliminated.

  A display device driving method according to the present invention includes a projector that projects an image, a spiral-shaped screen that displays a projection image projected from the projector, and a projection image that is displayed on the screen is projected and formed in space. In a driving method of a display device comprising: an imaging unit; and a rotating unit that rotates a central axis of the screen, the projection image projected from the projector onto the screen according to a rotation angle of the central axis of the screen When the display pattern is switched from the first display pattern to the second display pattern, all-black display is performed.

  According to this, when the display is switched from the first display pattern to the second display pattern, the all black display is performed, so that the viewer does not feel uncomfortable.

  The display device driving method according to the present invention includes a projector that projects an image, a screen that displays a projected image projected from the projector, a rotating unit that rotates a central axis of the screen, and a screen that is displayed on the screen. An image forming unit configured to form a projected image in space, wherein the distance between the screen and the image forming unit varies discretely according to the rotation angle of the central axis of the screen. A black image is formed in space as the projection image.

  According to this, even if the display pattern changes when the projection position on the screen changes on the optical axis, there is no sense of incongruity for the observer.

The figure which shows schematic structure of the display apparatus which is 1st Embodiment of this invention. The perspective view which shows schematic structure of a rear screen. It is a figure which shows schematic structure of a rear screen, Comprising: (a) Side view, (b) Front view. The figure for demonstrating the principle in which an aerial image is produced | generated with a display apparatus. The figure which shows typically a mode that the display apparatus of 1st Embodiment was installed in the ceiling of the hallway of a building. The figure which shows schematic structure of the display apparatus of 2nd Embodiment. The figure which shows the operation | movement timing chart of the display apparatus in 2nd Embodiment. It is a figure which shows the structure of the display apparatus of 3rd Embodiment, Comprising: (a) Side view, (b) Plan view. The perspective view which shows the structure of a rear screen. The figure which shows the operation | movement timing chart of the display apparatus in 3rd Embodiment. The figure which shows typically a mode that the display apparatus of 3rd Embodiment was installed in the corner of the corridor of an underground shopping mall or a large store. The figure which shows schematic structure of the display apparatus of 4th Embodiment. The figure which shows schematic structure of the display apparatus of 5th Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. In each drawing used for the following description, the scale of each member is appropriately changed to make each member a recognizable size.

[First Embodiment]
FIG. 1 is a diagram showing a schematic configuration of a display device according to a first embodiment of the present invention.
As shown in FIG. 1, the display device 100 of the present embodiment includes a projector 1, a rear screen (screen) 2, a motor (rotating unit) 25, a Fresnel lens (imaging unit) 3, and a signal generation unit (signal generation unit). ) 5 is provided in the housing 13.

  The projector 1 is equipped with a light valve, a projection lens, and the like, and projects an image on the rear screen 2 based on a video signal input from an external video signal generating means such as a personal computer (not shown). Here, the projector 1 is connected to a signal generator 5 that is also installed in the housing 13, and performs display according to a signal (display timing) input from the signal generator 5. A light valve mounted in the projector 1 is illuminated by a light source (not shown), enlarged and projected by a projection lens, and forms an image on the rear screen 2.

  The rear screen 2 is a transmissive screen, and is configured such that a spiral screen surface (projection surface) 2A rotates around the optical axis. The rotation of the rear screen 2 is driven by a motor 25. Realized. The rear screen 2 rotates at a predetermined rotation speed during use.

  The Fresnel lens 3 forms a projected image displayed on the rear screen 2 in a space, and includes a plurality of prisms (not shown) provided concentrically at minute intervals. It is provided on the front surface 13 a of the housing 13.

FIG. 2 is a perspective view showing a schematic configuration of the rear screen. FIG. 3 is a diagram showing a schematic configuration of the rear screen, (a) a side view and (b) a front view.
As shown in FIGS. 2 and 3A, the rear screen 2 of the present embodiment has a central axis 22 and a spiral screen surface 21A of 360 ° around the central axis 22 around the central axis 22. And a screen 21. A rotation shaft 26 of a motor 25 is connected to the central shaft 22 on the end of the central shaft 22 opposite to the Fresnel lens 3, and the screen surface 21 </ b> A is rotated around the shaft by driving the motor 25. It is configured to rotate.

  Here, as shown in FIG. 3B, the screen 21 has a spiral shape so that no gap is formed between the end portions 21a and 21b of the screen 21 when viewed from the front (axial direction). The end portions 21a and 21b coincide with each other at least in the direction orthogonal to the axial direction so that the entire periphery around the axis becomes the screen surface 21A. Since the screen surface 21 </ b> A is not interrupted around the central axis 22, the end portions 21 a and 21 b of the screen 21 do not necessarily have to coincide with each other. It is good also as a structure which the edge part 21b located slightly overlaps a part of 21 A of screen surfaces of the front side. Such a screen 21 is supported on the central shaft 22 via a plurality of support portions 23 whose positions are sequentially changed around the axis.

Projected light from the projector 1 is projected onto the rear screen 2 at a predetermined position on the screen surface 21A. The optical axis LX of the projection light projected from the projector 1 and the central axis 22 of the rear screen 2 are parallel to each other. That is, the projector 1 that projects an image onto the screen surface 21A of the screen 21 having the above-described configuration is located on the radially outer side of the central axis 22, and the optical axis LX of the projected light does not coincide with the central axis 22 of the screen. Placed in position. Thereby, the projection light from the projector 1 can be reliably projected on the predetermined projection position P on the screen surface 21A. The projection position P on the screen surface 21A is set at a location away from the central axis 22 by a predetermined distance. Since the position of the projector 1 with respect to the rear screen 2 is fixed, by rotating the motor 25, the projection position P moves on the screen surface 21A of the rear screen 2 that rotates at a predetermined rotational speed. Become.
The shape, rotation speed, and projection position P of the rear screen 2 can be changed as appropriate.

Hereinafter, the principle of generating an aerial image in the display device having the above configuration will be described.
FIG. 4 is a diagram for explaining the principle of generating an aerial image in the display device.
An image is projected onto the rear screen 2 by the projector 1 to generate an object image (projected image) Y. The object image Y is projected by the Fresnel lens 3 and forms a real image as a spatial image Z in space. An observer can visually recognize a real image (aerial image Z) from the front side of the display device, that is, from the light emission side of the Fresnel lens 3.

  In the display device of the present embodiment, as shown in FIG. 3A, the image from the projector 1 is projected at the projection position P of the screen surface 21 </ b> A. It rotates and the distance between the rear screen 2 (screen surface 21A) and the Fresnel lens 3 changes. In the present embodiment, description will be made assuming that the rear screen 2 rotates counterclockwise.

Returning to FIG. 4, if the focal length of the Fresnel lens 3 is f, the distance from the rear screen 2 to the Fresnel lens 3 is a, and the distance from the Fresnel lens 3 to the aerial image Z is b.
1 / f = 1 / a + 1 / b
The relationship is established.

At this time, the size enlargement ratio M of the aerial image Z with respect to the object image Y on the rear screen 2 (screen surface 21A) is:
M = b / a
Can be expressed as

Here, when the projection position P on the screen surface 21A moves on the optical axis due to the rotation of the rear screen 2 having a spiral shape, the size enlargement ratio of the aerial image Z before and after the movement is determined as follows. Assuming that the size enlargement ratio M1 and the size enlargement ratio M2 after movement are
1 / f = 1 / a1 + 1 / b1 = 1 / a2 + 1 / b2
M1 = b1 / a1
M2 = b2 / a2
It becomes.

  Here, for example, when the focal length f of the Fresnel lens 3 is 300 (mm), the distance a1 from the rear screen 2 before movement to the Fresnel lens 3 is 400 (mm), and from the rear screen 2 after movement to the Fresnel lens. 3 is 500 (mm), the distance b1 from the Fresnel lens 3 before movement to the aerial image Z is 1200 (mm), and the distance b2 from the moved Fresnel lens 3 to the aerial image Z is 750 ( mm).

  Therefore, the result of size enlargement ratio M1 = 3 before movement and size enlargement ratio M2 = 1.5 after movement is obtained.

  Since the maximum value of the object image Y corresponds to the size of the aerial image Z, if this is “5”, the distance from the screen surface 21A (projection position P) to the Fresnel lens 3 is a1 (400 mm) to a2 (500 mm). When switching between them, a spatial image Z having a size of M1 = 15 is formed at a position b1 (1200 mm) between the Fresnel lens 3 and the spatial image Z, and a distance b2 (750 mm) between the Fresnel lens 3 and the spatial image Z. ), An aerial image Z having a size of M2 = 7.5 is formed.

Specifically, assuming that the distance from the projection lens of the projector 1 to the Fresnel lens 3 is a fixed value of 1000 mm, the projection distance c from the projector 1 is
c = 1000-a
It becomes.

That is,
c1 = 1000−a1 = 600, c2 = 1000−a2 = 500
It becomes.

Here, since the image size on the rear screen 2 is substantially proportional to the projection distance c, when the projection position with respect to the rear screen 2 is 400 mm (a1), in the case of 500 mm (a2),
c2 / c1 = 500/600 = 1 / 1.2
The image size becomes.

Therefore, the size of the aerial image Z formed at a position of 750 mm (b2) is
7.5 / 1.2 = 6.25
Thus, the size of the aerial image Z is displayed smaller than when the projection distance is fixed, and the perspective is apparently emphasized.

  That is, in the display device 100 of the present embodiment, since the projection light from the projector 1 is projected to the predetermined projection position P on the screen surface 21A of the rear screen 2 having a spiral shape, the rear screen 2 rotates. Thus, the projection position P on the screen surface 21A moves in the axial direction (optical axis direction). Thereby, for example, as described above, the distance a from the screen surface 21A (projection position P) to the Fresnel lens 3 continuously changes from 400 mm to 500 mm, and the distance b from the Fresnel lens 3 to the aerial image Z is changed from 1200 mm. It changes continuously to 750 mm. In this way, the position of the aerial image Z formed on the side opposite to the rear screen 2 of the Fresnel lens 3 changes continuously so as to gradually approach the Fresnel lens 3 side. An observer looking from the front will see a display that moves continuously in the depth direction and gradually decreases.

In this embodiment, as shown in FIG. 3, the central axis 22 of the rear screen 2 and the optical axis LX of the projection light from the projector 1 are parallel to each other. The rotation axis (center axis 22) of the rear screen 2 may be inclined so as to reduce the inclination of the screen projection surface with respect to LX. This eliminates display distortion and the like.
Further, the rear screen 2 may be rotated clockwise.

FIG. 5 schematically shows a state in which the display device having the above configuration is installed on the ceiling of the hallway of the building.
Here, a sign G indicating an emergency exit is displayed as the aerial image Z by the signal generator 5 installed inside the housing 13 shown in FIG.
As shown in FIG. 5, when the sign G indicating the evacuation direction is indicated by the display device 100 having the above-described configuration installed on the ceiling 31 of the hallway 30 of the building, the projection light from the projector 1 is projected on the rotating rear screen 2. As a result, the aerial image Z (mark G) formed in front of the Fresnel lens 3 through the Fresnel lens 3 is displayed with its position continuously moved in a direction gradually approaching from a position away from the Fresnel lens 3.

Further, as the display position is moved, the size of the displayed image (marker G) is continuously reduced, so that the sign G is directed away from the viewer (in the direction behind the corridor 30). Looks like it ’s moving. The observer who visually recognizes the sign G recognizes that the evacuation site is in the direction ahead of the hallway 30 and is guided to the back of the hallway 30.
By performing such display, it becomes possible to accurately notify the observer who has seen the sign G of the direction of evacuation.

  By rotating the rear screen 2 in the reverse direction, the sign G appears to move closer to the observer from the observer side, so the evacuation direction is the direction opposite to the direction in which he / she travels. Recognize Accordingly, it is possible to guide the observer in a direction away from the sign G side (display device 100) side.

  According to the display device 100 of this embodiment, the display position of the aerial image Z is changed to light by continuously changing the distance between the projection position P on the rear screen 2 on which the object image Y is displayed and the Fresnel lens 3. Since it can be changed in the axial direction, it is possible to guide the observer in a predetermined direction with one display device. As described above, the image projected on the rotating spiral rear screen 2 is formed as the aerial image Z, and the aerial image Z is moved and displayed in the optical axis direction, thereby presenting the moving direction to the observer. be able to.

[Second Embodiment]
Next, the configuration of the display device according to the second embodiment will be described.
FIG. 6 is a diagram illustrating a schematic configuration of a display device according to the second embodiment.
As shown in FIG. 6, in addition to the projector 1, the rear screen 2, the motor 25, the Fresnel lens 3, and the signal generation unit (signal generation means) 5, the display device 200 of the present embodiment includes a setting dial 6 and an encoder (angle). The detection unit) 7 and the setting switching unit (switching unit) 8 are further provided in the housing 13.

  The setting dial 6 sets the speed of movement of the rear screen 2. The speed of rotation of the motor 25 is controlled by the set value of the setting dial 6, and the speed of movement of the rear screen 2 connected to the motor 25 is determined. On the output side of the motor 25, an encoder 7 that detects the angle of the rotation shaft of the motor 25 is provided, and the value is output to the setting switching unit 8.

  The setting switching unit 8 switches the display setting according to the rotation angle of the rotation axis of the motor 25, that is, the rotation angle of the center axis 22 of the rear screen 2, and outputs the output value to the signal generation unit 5. The signal generating unit 5 switches the display signal based on the signal input from the setting switching unit 8.

  Then, by rotating the rear screen 2 at a predetermined speed by driving the motor 25, the aerial image Z formed in front of the Fresnel lens 3 can be continuously moved in the optical axis direction at a predetermined speed. it can.

Next, a method for driving the display device in this embodiment will be described.
FIG. 7 is a diagram illustrating an operation timing chart of the display device according to the present embodiment.
Corresponding to the speed set by the setting dial 6, the motor 25 is driven and controlled, and the rear screen 2 rotates at a predetermined speed. From the encoder 7, the rotation angle of the rotation shaft of the motor 25 is detected corresponding to the speed set by the setting dial 6. Then, a display switching signal is output to the signal generating unit 5 according to the angle set by the setting switching unit 8, and the signal generating unit 5 switches the display signal to be output to the projector 1 according to the input display switching signal.

  In the present embodiment, the angle of the position where the rear screen 2 (the rotation shaft of the motor 25) is stopped detected by the encoder 7 is set as an absolute angle, and when the display device 200 is turned on, The signal of the present angle of the stop position of the rear screen 2 rotated mechanically is output. The angle at each position in one rotation (360 °) of the rear screen 2 (the rotation axis of the motor 25) is determined by an output signal from the encoder 7. Here, the resolution of the encoder 7 is N pulses / 1 rotation (360 °), and for each predetermined display pattern A, display pattern B, display pattern C, and display pattern all black according to the rotation of the rear screen 2. The set pulse number / rotation angle is output from the encoder 7.

  As shown in FIG. 7, the display patterns A, B, and C projected from the projector 1 are sequentially switched each time a switching signal is input from the setting switching unit 8 to the signal generation unit 5 in accordance with the output signal from the encoder 7. . When the signal generator 5 first outputs a pattern A signal and sequentially switches to a pattern B signal and a pattern C signal, an all black signal is finally output.

  Specifically, first, when the rotation angle of the rotation shaft of the motor 25 output from the encoder 7 reaches a predetermined angle set in the setting switching unit 8, a predetermined display switching signal is turned on, and the signal generating unit 5 A display signal indicating pattern A is output to the projector 1.

  At this time, the positions of the formed aerial images Z (A), Z (B), Z (C), and Z (Bk) are the farthest distances from the Fresnel lens 3 (A ) Sequentially from position (B) to position (C), and an all-black aerial image Z (Bk) is displayed at a position (Bk) closest to the Fresnel lens 3.

  Along with this, the size of the aerial image Z also sequentially reduces and changes to aerial image Z (A) <aerial image Z (B) <aerial image Z (C) <aerial image Z (Bk). At this time, since the position of the aerial image Z changes as shown in the figure, the display pattern changes while the display position changes continuously.

  In addition, during the period in which the display position of the aerial image Z returns from the position (C) to the position (A), the display is set to all black display, so that the viewer does not feel uncomfortable. That is, since a small all-black display is performed at a position farthest from the observer side, the display can be switched in a natural manner. From the observer, the real image (aerial image Z) that can be visually recognized seems to move in a direction away from the user (a direction away from him / her), so that the evacuation direction is further forward of the observer. In this way, the observer's evacuation direction is indicated and guided.

  Here, the pattern to be displayed may be a still image or a moving image.

  As described above, since the signal to be displayed is switched depending on the rotation angle of the rear screen 2 (the rotation axis of the motor 25), the rear image corresponding to the position where the aerial image Z is formed regardless of the speed of the motor 25. By switching the pattern displayed on the screen 2, different patterns can be displayed while changing the display position.

[Third Embodiment]
Next, the configuration of the display device according to the third embodiment will be described.
FIG. 8 is a diagram illustrating a configuration of the display device according to the third embodiment, and is (a) a side view and (b) a plan view. FIG. 9 is a perspective view showing the configuration of the rear screen.
As shown in FIGS. 8A, 8 </ b> B, and 9, the rear screen 32 included in the display device 300 of the present embodiment is a parallel plane (screen surface) divided every 90 ° around the central axis 22. 33A), and each screen surface 33A is arranged in the optical axis direction.

The rear screen 32 includes a central shaft 22 and a plurality of screen portions 33 arranged at different positions in the axial direction of the central shaft 22. The screen portion 33 has a fan shape in plan view, and the circumferential angle with respect to the arc is 90 °. In the present embodiment, four screen portions 33 (331, 332, 333, 334) are arranged at predetermined intervals with the screen surfaces 33A parallel to the axial direction of the central axis 22. Each screen portion 33 (331, 332, 333, 334) is arranged around the central axis 22 (clockwise) at different positions every 90 ° so that the observer can view the screen from the front of the rear screen 32. When viewed, all the screen surfaces 33A of the screen portions 33 (331, 332, 333, 334) can be seen.
The display device 300 of the present embodiment is configured such that the rear screen 2 rotates clockwise.

  In the display device 300 of this embodiment, the setting dial 6 is connected to the motor 25 that drives the rear screen 32 as in the previous embodiment, and the rotational speed of the rear screen 32 can be set according to the setting value. it can. Further, the encoder 7 connected to the output side of the motor 25 detects the rotation angle of the rotation shaft of the motor 25, and the setting switching unit 8 indicates the timing for switching the display to the signal generating unit 5 according to the detection result. A switching signal is output.

Next, a method for driving the display device in this embodiment will be described.
FIG. 10 is a diagram illustrating an operation timing chart of the display device according to the present embodiment.
In the display device 300, the angle of the rotation axis of the motor 25 is output from the encoder 7 corresponding to the rotation speed of the motor set by the setting dial 6, and when the angle set by the setting switching unit 8 is reached, the display switching signal Is output. Each time a display switching signal is input from the setting switching unit 8, the signal generating unit 5 switches and outputs the display signal.

In the present embodiment, as shown in FIG. 10, when a display switching signal is output from the setting switching unit 8, the signal generating unit 5 first outputs a display signal of pattern A, and the projector 1 shown in FIG. Predetermined projection light is projected onto the screen unit 331 (projection period T1). Thereafter, the rotation of the rear screen 2 advances, and the boundary portions of the screen portions 331 and 332 (sides of the screen portions 331 and 332 facing each other around the axis of the central axis 22) reach the projection position P on the rear screen 2. At the timing, a display switching signal is output from the setting switching unit 8 and an all black display signal is generated in the signal generating unit 5 (black display period T5). The black display is performed during a period in which projection is performed on both the screen portions 331 and 332, and the black display ends at the timing when the projection position P is completely switched to the screen portion 332.
Then, projection is performed on the screen unit 332 in the projection period T2, and the black display period T5 is switched at the timing when the screen unit 332 is switched to the screen unit 333.

  As described above, the screen to be projected on the boundary between the projection period T1 to the screen unit 331, the projection period T2 to the screen unit 332, the projection period T3 to the screen unit 333, and the projection period T4 to the screen unit 334. There is a period (black display period T5) during which parts are switched, and all black display is performed. When the screen unit 33 to which the projection light is projected is switched to another screen unit 33, the display displayed on each screen unit 33 is sequentially changed to patterns A, B, and C by performing all black display. However, it is possible to obtain an effect that an uncomfortable feeling to the observer does not occur.

  As in the present embodiment, the pattern A is first generated, the pattern B is displayed through the all black display, and the display is sequentially switched again to the all black display, the pattern C, the all black display, the pattern D, and the all black display. Since the position of the aerial image Z is changed to four positions in the optical axis direction, the display pattern is sequentially switched to the patterns A, B, and C while the display position is changed. At this time, the display is displayed in black. There is no sense of discomfort to the observer.

FIG. 11 schematically shows a state in which the display device configured as described above is installed in the corner of a corridor of an underground shopping mall or a large store.
The aerial image Z displayed by the display device 300 is discrete in position as the displayed characters sequentially change from a location away from the display device 300 along the extending direction of the corridor 30 to a direction close to the display device 300. Is displayed. Furthermore, since the display size is continuously reduced, the display image appears to move closer to the display device 300 when viewed from the observer.

  In other words, from the observer side, the indications of “new”, “departure”, “sale”, and “←”, which are spatial images, are moving away from you (in the direction behind the corridor 30). appear. Here, “←” is displayed instead of the all black display. Thereby, it is possible to present to the observer that the product to be “newly released” is sold by the store indicated by the arrow. The observer who visually recognizes the display recognizes that the store is in the direction indicated by the arrow, and is guided to the back of the hallway 30.

  With such a configuration, the distance between the projection position on the rear screen 2 on which the object image is displayed and the Fresnel lens 3 can be changed, and the aerial image Z can be discretely continuously moved and displayed. By 300, an observer's movement can be induced while presenting information such as characters.

  Note that the arrangement interval of the screen unit 33 on the optical axis is determined in advance corresponding to the interval at which the real image is displayed, so that, for example, the interval is displayed at an equal interval, or the interval is reduced as the distance from the observer increases. Can be set.

[Fourth Embodiment]
Next, the configuration of the display device according to the fourth embodiment will be described.
FIG. 12 is a diagram illustrating a schematic configuration of a display device according to the fourth embodiment.
As shown in FIG. 12, in the display device 400, a focus control unit 41 is connected to the output side of the encoder 7. The focus control unit (focus control means) 41 operates in conjunction with the focus control unit 41 when the projection distance to the rear screen 2 (32) changes, that is, as the rotation angle of the rotation axis of the motor 25 changes. Even if an aerial image is formed at any position, it is possible to always achieve an optimum focus.

Since the projection distance changes corresponding to the output of the encoder 7, the optimum focus can always be obtained by obtaining and setting the optimum focus control value corresponding to the output of the encoder 7 in advance.
Moreover, you may enable it to set freely according to the size of the aerial image Z which changes according to the rotation angle of the rear screen 2 (32).

[Fifth Embodiment]
Next, a display device according to a fifth embodiment will be described.
FIG. 13 is a diagram illustrating a schematic configuration of a display device according to the fifth embodiment.
As shown in FIG. 13, in the display device 500, a zoom control unit (zoom control means) 51 is connected to the output side of the encoder 7. When the projection distance to the rear screen 2 (32) changes, that is, as the rotation angle of the rotation axis of the motor 25 changes, the zoom control unit 51 operates the zoom control unit 51 in conjunction with the position of the aerial image. Even when Z is formed, it is possible to always perform display with an optimum size.

  Corresponding to the output of the encoder 7, the projection distance c and the distance a from the rear screen 2 to the Fresnel lens 3 are determined. As a result, the distance b from the Fresnel lens 3 to the aerial image Z and the size of the aerial image are also determined. The size of the aerial image Z can be changed by the zoom control unit 51 (see FIG. 4).

  A zoom control value is obtained in advance corresponding to the output of the encoder 7 so that the size of the aerial image Z to be displayed corresponds to the distance b from the Fresnel lens 3 to the aerial image Z. A zoom lens (not shown) mounted inside the projector 1 can be controlled by outputting a predetermined zoom control value from the zoom control unit 51 to the projector 1. Thereby, for example, even if the position of the aerial image changes, it can be displayed without changing the size of the aerial image, or conversely, the change can be increased to enhance the perspective.

  According to the configuration of the present embodiment, by controlling the zoom lens inside the projector 1 by the zoom control unit 51, the aerial image can be displayed in an arbitrary size even if the position of the aerial image changes.

  According to the display device of each of the embodiments described above, the display pattern signal can be switched depending on the rotation angle of the rear screen 2 (the rotation axis of the motor 25), and therefore the display is displayed corresponding to the position where the aerial image is formed. The contents can be switched and displayed. Furthermore, since the encoder 7 is provided, the position where the aerial image is displayed and the switching timing of the display contents can be controlled collectively.

  As described above, the preferred embodiments according to the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the examples. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 32 ... Rear screen (screen), 2A, 33A ... Screen surface (projection surface), 3 ... Fresnel lens (imaging means), 5 ... Signal generation part (signal generation means), 7 ... Encoder ( (Angle detection means), 8 ... setting switching section (switching means), A, B, C, D ... display pattern, b ... distance, P ... projection position, Y ... projection image, Z ... aerial image, 21 ... screen, 22 ... central axis, 25 ... motor (rotating means), 26 ... rotating axis, 41 ... focus control section, 41 ... focus control section (focus control means), 51 ... zoom control section (zoom control means), 100, 200, 300 , 400, 500... Display device

Claims (8)

A projector for projecting an image;
A spiral-shaped screen for displaying a projected image projected from the projector;
Imaging means for projecting and forming a projected image displayed on the screen in space;
Rotating means for rotating the central axis of the screen,
A display device characterized in that the distance between the projection surface of the screen and the imaging means changes continuously. A projector for projecting an image;
A screen for displaying a projected image projected from the projector;
Rotating means for rotating the central axis of the screen;
Imaging means for forming a projection image displayed on the screen in space, and
The screen is configured to have a parallel plane divided into a plurality when viewed from the central axis direction,
A display device characterized in that the distance between the projection surface of the screen and the imaging means varies discretely. Angle detection means for detecting a rotation angle of the central axis of the screen;
Switching means for setting the timing for switching the display signal by the output of the angle detection means;
The display device according to claim 1, further comprising: a signal generation unit that switches and outputs a plurality of preset video signals according to an output of the switching unit. The display driving method according to claim 1, wherein a focus control unit or a zoom control unit is provided between the angle detection unit and the projector. 3. The display device according to claim 2, wherein the plurality of parallel planes arranged in the direction of the central axis are sequentially arranged at different predetermined angles around the central axis. The display device according to claim 1, wherein the central axis of the screen is inclined with respect to an optical axis of projection light emitted from the projector. A projector for projecting an image; a spiral-shaped screen for displaying a projection image projected from the projector; an imaging means for projecting and projecting a projection image displayed on the screen in space; and a central axis of the screen And a rotation means for rotating the display device,
All black display is performed when the display pattern of the projected image projected from the projector to the screen is switched from the first display pattern to the second display pattern according to the rotation angle of the central axis of the screen. A display device driving method. A projector that projects an image, a screen that displays a projection image projected from the projector, a rotating unit that rotates the central axis of the screen, and an imaging that forms a projection image displayed on the screen in space Means for driving a display device comprising:
When the distance between the screen and the imaging unit changes discretely according to the rotation angle of the central axis of the screen, an all black image is formed in space as the projection image. Driving method.

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