JP2009053567A - Projector for displaying stereoscopic image - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control the state of a light beam composing a stereoscopic image in accordance with the position of an observer, and to achieve the optimum stereoscopic display. <P>SOLUTION: By light projected from an projection lens 11 in a projector 1, a three-dimensional spatial image 31 is reproduced according to the principle of IP (Integral Photography). A lens array 3 is irradiated with laser light 41 from a laser light source 4 which is refracted by any of the individual lenses of the lens array 3, and is made incident on a screen 2, to form a spot. The diameter of the spot is made the minimum when the screen 2 is located in the focal position of the lens array 3, and the spacing between the lens array 3 and the screen 2 can be detected by the size of the spot. The projector 1 detects the above spacing by a monitor image signal obtained by imaging the above spot by a camera 5, forms a control signal, feeds the same to a driving mechanism 6, and variably controls the above spacing by the driving mechanism 6, to optimize a stereoscopic image. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stereoscopic image display projector, and more particularly to a stereoscopic image display projector used for a stereoscopic display that reproduces a three-dimensional aerial image based on the principle of integral photography.

  Based on the principle of Integral Photography (IP) proposed by MGLippmann in 1908, a natural three-dimensional image is reproduced by reproducing light rays equivalent to those from the real surface in space. Research and development of three-dimensional displays are actively performed (see, for example, Non-Patent Document 1, Non-Patent Document 2, Non-Patent Document 3, and Patent Document 1).

  In Non-Patent Document 1, a subject is photographed using a lens array and a photographic dry plate, and then a developed photograph is illuminated from behind the lens array, so that light rays are gathered back to the original subject position. It has been reported that a three-dimensional image is reproduced.

  Patent Document 1 and Non-Patent Document 2 report an integral 3D television system that digitizes the above process and performs imaging and display in real time. In Non-Patent Document 3, the present applicant reports an integral 3D television system using a projector.

M.G Lippmann, “Epreuves reversibles. Photographies integrals.”, Comptes-Rendus Academie des Sciences-146, pp.446-451 (1908) Satoshi Saii, Haruo Hoshino, Fumio Okano, Ichiro Yuyama, “Integral Photography Imaging Experiment Using Refractive Index Lens”, 3D Image Conference '98, pp.76-81 Koya Suehiro, Hiroya Nakanura, Kuunio Yamada, Shinji Nakamura, Takayuki Sugahara, “Integral 3D imaging system using monocular 2D video and depth data”, Proceedings of SPIE Volume 5664, Stereoscopic Displays and Virtual Reality Systems XII, p.230-240 (2005 ) Japanese Patent No. 3678792

  However, the conventional projection type IP projector described in each of the above documents can optimize the image quality of the planar image on the screen, but is emitted from the lens array and reproduced in space by the IP system. There is a problem that the image cannot be optimized.

  The reason is as follows. In order to optimize the stereoscopic image emitted from the lens array, the size of the planar image on the screen is finely adjusted to match the size of the lens array, and at the same time, the screen and the lens array are adjusted according to the image size. The distance and tilt between them must be further adjusted. However, the conventional projection type IP projector does not have a function of detecting the distance or tilt between the screen and the lens array, and simply has a zoom mechanism and a focus for adjusting the projection size of a planar image on the screen. It only has a focus mechanism to adjust. Therefore, the conventional projection IP projector can optimize the image only for the planar image on the screen, and cannot optimize the stereoscopic image as a function of the projector.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a stereoscopic image display projector capable of controlling a light beam state constituting a stereoscopic image according to the position of an observer and capable of optimal stereoscopic display. And

In order to achieve the above object, the first aspect of the present invention is in the vicinity of the first surface of the optical member in which the first surface is a diffusion surface and the second surface opposite to the first surface is a surface having a light deflection function. A three-dimensional spatial image is reconstructed by the principle of integral photography by irradiating incoherent light of a two-dimensional image to collect multi-directional light beams at spatial positions near the second surface. An image display projector,
Control signal generating means for generating a control signal for driving a drive mechanism for controlling the relative distance or relative inclination between the first surface and the second surface of the optical member, and driving the drive mechanism by the control signal By changing the optical characteristics of the optical member, the spread angle of the light beam emitted from the second surface is controlled, and the viewing area of the observer who observes the aerial image is controlled.

  In order to achieve the above object, according to a second aspect of the present invention, there is provided an imaging means for imaging a spot formed on the first surface by entering coherent light from the second surface side of the optical member, and imaging by the imaging means. In addition to the configuration of the first invention, detection means for detecting the relative distance or relative inclination between the first surface and the second surface of the optical member on the basis of the monitor image signal of the spot obtained as described above is detected. The drive mechanism is controlled via the control signal generating means in accordance with the relative distance or relative inclination between the first surface and the second surface detected by the means.

In order to achieve the above object, the third invention is configured to irradiate the screen with incoherent light of a two-dimensional image to form a large number of planar images on the screen, and to transmit the numerous planar images through the screen. Diffuse light is diffused and deflected optical element array is provided facing the screen, and the diffused light from the screen is projected as a group of light rays that are approximately parallel to different directions depending on the pixel position, and these light beams are collected in space. A stereoscopic image display projector that reproduces a three-dimensional aerial image based on the principle of integral photography,
An image pickup means for picking up one or more spots formed on the screen together with a planar image by making a substantially parallel light beam that is coherent light incident on the deflecting optical element array, and a spot obtained by picking up an image by the image pickup means Based on the monitor image signal, detection means for detecting the relative distance or relative inclination between the screen and the deflection optical element array, and the interval or inclination between the screen and the deflection optical element array detected by the detection means And a control signal generating means for generating a control signal for controlling a driving mechanism for changing the distance and inclination between the screen and the deflecting optical element array, and the control signal generating means emits the deflecting optical element array to the space. Generating a control signal for controlling one or both of the divergence angle of the light beam and the viewing zone of the observer observing the aerial image. .

  In the present invention, the relative distance or relative inclination between the first surface and the second surface of the optical member, or the distance or inclination between the screen and the deflection optical element array is formed on the first surface or the screen of the optical member. In the case where there are a plurality of spot diameters or spots based on the monitor image signal of the spot to be detected, the relative position or the like is detected, and the above-described interval or inclination is controlled based on the detection result. One or both of the divergence angle of the light beam emitted from the second surface and the deflection optical element array and the viewing area of the observer observing the aerial image can be controlled.

  According to the present invention, it is possible to control the light ray state (the spread angle of light rays and the viewing area of the observer) that constitutes a stereoscopic image according to the position of the observer, thereby enabling optimal stereoscopic image display.

  Next, the best mode for carrying out the invention will be described in detail with reference to the drawings.

  FIG. 1 shows a system configuration diagram of an example of a stereoscopic image display system provided with a stereoscopic image display projector according to the present invention. As shown in the figure, this stereoscopic image display system 100 is an example of a screen 2 provided on the front surface of the stereoscopic image display projector 1 of the present invention and a deflecting optical element array provided so as to be opposed to and separated from the screen 2. The lens array 3, the laser light source 4 that emits the laser light 41 that irradiates the lens array 3 from the side opposite to the light irradiation surface from the screen 2, and the drive mechanism 6 that adjusts the position of the lens array 3. Consists of. A driving signal for controlling the driving mechanism 6 is generated by the stereoscopic image display projector 1.

  In the stereoscopic image display system 100 having this configuration, the light projected from the projection lens 11 of the stereoscopic image display projector 1 according to the present invention forms an image on the screen 2 to form a large number of planar images 21. The light from the large number of flat images 21 is transmitted through the screen 2 and diffused, and the diffused light is incident on the lens array 3 provided on the opposite side of the screen 2 on the side opposite to the projector 1.

  The lens array 3 has a configuration in which a large number of lenses are regularly arranged in a two-dimensional manner, and the diffused light from the screen 2 is projected as a group of light beams substantially parallel to different directions depending on the pixel position, and these light beam groups are projected. Collect light in space. A three-dimensional aerial image 31 is reproduced at this condensing position by the principle of integral photography (IP).

  In the stereoscopic image display system 100, a laser light source 4 that emits laser light that is coherent light is disposed in the vicinity of an observer (the eyeball is indicated by 7) that observes the aerial image 31. Specifically, a small laser pointer is suitable as the laser light source 4. The laser light 41 from the laser light source 4 is irradiated onto the lens array 3, is refracted by any of the individual lenses of the lens array 3, and enters the screen 2. If the screen 2 is disposed on the focal plane of the lens array 3, the laser light 41 forms an image on the screen 2.

  FIGS. 2A and 2B are diagrams showing such an image formation state. 2A and 2B, the laser beams 41a and 41b emitted from the laser light source 4 are refracted by the lens array 3 and condensed near the screen 2. As shown in FIGS. 2A and 2B, when the lens array 3 is tilted with respect to the screen 2, the screen 2 is shifted from the focal plane of the lens array 3 as shown in FIG. In addition, the laser beam 41a is defocused on the screen 2. On the other hand, at a position coincident with the focal plane of the lens array 3 of the screen 2, as shown in FIG. 5B, the laser beam 41b is in an on-focus state, and the spot diameter on the screen 2 is minimized. Therefore, the distance and inclination between the lens array 3 and the screen 2 can be known from the diameter of the spot on the screen 2.

  Spots formed on the screen 2 by the laser light 41 (41a, 41b) emitted from the laser light source 4 are obtained by a camera 5 attached to the projector 1 as shown in FIGS. Monitoring is performed from behind the screen 2 (position opposite to the laser light source 4). Since the monitor image signal of the spot of the laser beam 41 on the screen 2 obtained by imaging with the camera 5 indicates the relative position (distance) and inclination between the lens array 3 and the screen 2, the monitor image signal is monitored by the method described later. The relative position (distance) and inclination are detected from the image signal.

  After detecting them, the above spot on the screen 2 has a minimum diameter, for example (in other words, the distance between the lens array 3 and the screen 2 becomes the focal length of each lens of the lens array 2). ), The lens array 3 is driven by the drive mechanism 6 shown in FIG. In this case, the spot diameter can be determined by displacing the lens array 3 back and forth by the drive mechanism 6 and observing the monitor image signal of the spot.

  The screen 2 and the lens array 3 constitute a broad screen. The screen 2 constitutes a first surface (diffusion surface) of the broad screen, and the lens array 3 is a screen of the broad screen. It can also be said that it constitutes the second surface (surface having a light deflection function). Driving the lens array 3 so that the relative position (distance) and inclination between the lens array 3 and the screen 2 is changed by the driving mechanism 6 changes the optical characteristics of the screen in a broad sense. Is equivalent.

  Next, the configuration of the stereoscopic image display projector 1 of the present invention will be described.

FIG. 3 is a schematic block diagram of an embodiment of a stereoscopic image display projector according to the present invention. In the figure, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals. As shown in FIG. 3, the stereoscopic image display projector 1 includes a light source 101, illumination optical systems 102 _{1 to} 102 _n , liquid crystal display elements 103 _{1 to} 103 _n , a projection lens unit 104, and a projection lens 11. In addition to the same configuration as the conventional projector, an imaging device 105, a signal processing unit 106, an arithmetic circuit 107, a control signal generation unit 108, and an input unit 109 are added.

The light source 101 includes a light emitting diode (LED), a laser light source, or a xenon lamp. The illumination optical system 102 ₁ to 102 _n are n pieces regularly arranged in total, respectively in the horizontal direction (the plane parallel to the direction of FIG. 3) and vertical direction (direction perpendicular to the paper surface in FIG. 3), from the light source 101 Incident light is converted into uniform illumination light and emitted. The illumination light emitted from the light source 101 may be three primary color light (white light) or monochromatic light.

The liquid crystal display elements 103 _{1 to} 103 _n are regularly arranged in total in the horizontal direction and the vertical direction, respectively, and illumination light from the corresponding illumination optical systems 102 _{1 to} 102 _n is incident thereon. The image of each pixel constituting the image to be displayed is displayed. The liquid crystal display elements 103 _{1 to} 103 _n may be reflective liquid crystal display elements using, for example, LCOS (Liquid Crystal On Silicon), or transmissive liquid crystal displays represented by HTPS (High Temperature Poly-Silicon). It is also possible to use other micro devices such as elements and DLP (Digital Light Processing: registered trademark).

The projection lens unit 104 includes, for example, a lens array in which a plurality of lenses are two-dimensionally arranged, and an aperture array in which a plurality of openings formed corresponding to the lenses constituting the lens array are two-dimensionally arranged. It consists of. The light beams of the two-dimensional image emitted from the liquid crystal display elements 103 _{1 to} 103 _n emitted from the aperture array in the projection lens unit 104 are incoherent light when a general light source other than the laser light source is used. The light passes through the lens 11 and is projected onto the screen 2.

  The stereoscopic image display projector 1 is a two-dimensional image display device having a projection optical system, and is arranged two-dimensionally in the horizontal direction and the vertical direction as a whole to form a two-dimensional image display device array. . The number of arrays depends on the resolution (number of pixels) of the liquid crystal display element 103 to be used. If a liquid crystal display element having a sufficiently high resolution can be used, an ordinary single (single plate type) or three (ie, RGB three plate type) configuration may be used without forming an array. In that case, the projection lens unit 104 is unnecessary, and in the case of a single plate type, it is directly incident on the projection lens 11 from the liquid crystal display element 103, and in the case of a three plate type, it is synthesized by a known color synthesis optical system (not shown). Then, the light may be incident on the projection lens 11.

  The imaging device 105 is a known solid-state imaging device such as a CCD (Charge Coupled Devise) or a CMOS sensor, and photoelectrically converts incident light and outputs an imaging signal. The signal processing unit 106 performs noise reduction processing by correlated double sampling (CDS) and other known imaging signal processing on the imaging signal and outputs a video signal. The image sensor 105 and the signal processing unit 106 constitute the camera 5 shown in FIGS. The arithmetic circuit 107 performs predetermined arithmetic processing on the video signal from the signal processing unit 106 to calculate, for example, the spot diameter of the imaging subject. The control signal generation unit 108 generates a control signal for driving and controlling the drive mechanism 6 based on the signal from the arithmetic circuit 107. It is possible to control how much the distance between the screen 2 and the lens array 3 is set by the driving mechanism 6 based on input information from the input unit 109.

Next, the operation of the present embodiment will be described. The illumination light emitted from the light source 101 is incident on the illumination optical systems 102 _{1 to} 102 _n to be in a telecentric state with linearly polarized light, and then illuminates the liquid crystal display elements 103 _{1 to} 103 _n , respectively. Each of the liquid crystal display elements 103 _{1 to} 103 _n displays a two-dimensional image by a reproduction device and a drive circuit (not shown). Light rays of the two-dimensional image emitted from the liquid crystal display elements 103 _{1 to} 103 _n are incident on the projection lens unit 104. The projection lens unit 104 forms an enlarged image of the two-dimensional image emitted from the liquid crystal display elements 103 _{1 to} 103 _n through the projection lens 11 in the vicinity of the screen 2.

  On the other hand, the image sensor 105 captures a spot on the screen 2 by the laser light 41 emitted from the laser light source 4 of FIG. The signal processing unit 106 performs a known signal on the input imaging signal to generate a monitor image signal, and supplies the monitor image signal to the arithmetic circuit 107. The arithmetic circuit 107 determines the spot diameter from the monitor image signal, and the control signal generator 108 generates a control signal based on the determination result. The control signal is supplied to the drive mechanism 6, and the position and inclination of the lens array 3 are changed by the drive mechanism 6.

  As described above, the stereoscopic image display projector 1 according to the present embodiment drives and controls the drive mechanism 6 based on the monitor image signal of the spot of the laser beam 41 on the screen 2 obtained by imaging with the camera 5. The lens array 3 and the screen 2 are arranged so that the distance between the lens array 3 and the screen 2 is equal to the focal length of each lens of the lens array 2, or as described later, Changing the relative position (distance) and tilt of the screen 2 not only optimizes the divergence angle (or directivity) of the light rays from the lens array 3, but also automatically optimizes the viewer's viewing area. Make it possible.

  Further, since the observer has the laser light source 4 described above, the spot position on the screen 2 moves according to the position of the observer, so the state of the light beam constituting the stereoscopic image is controlled according to the position of the observer. It is possible to display an optimal stereoscopic image.

  FIG. 4 shows a system configuration diagram of an embodiment of a stereoscopic image display system provided with a stereoscopic image display projector according to the present invention. In the figure, the same components as those in FIG. In FIG. 4, a laser light source 40 held by an observer is a light source capable of simultaneously irradiating a plurality of light beams. For example, a diffractive optical element that divides a light beam is attached to a normal laser pointer. The laser light emitted from the laser light source 40 includes a total of five light beams 41 irradiating the center of the lens array 3 and light beams 411, 412, 413 and 414 irradiating the periphery of the center of the lens array 3. These five light beams (laser beams) 41, 411, 412, 413 and 414 irradiate the lens array 3 simultaneously.

  As a result, five spots are simultaneously formed on the screen 2, and the relative positional relationship between the five spots is determined based on the monitor image signal obtained by imaging the five spots with the camera 5. The inclination of the lens array 3 can be detected.

  Next, a method for adjusting a distance (hereinafter also referred to as an interval) between the lens array 3 and the screen 2 by the stereoscopic image display projector of the present invention will be described.

  FIG. 5 illustrates a case where the distance between the lens array 3 and the screen 2 is shorter than the focal length of the lens array 3. In this case, as shown in FIG. 5, the laser light 41 emitted from the laser light source 4 (laser light source 40 in FIG. 4) is condensed on the screen 2 in a blurred state.

  On the other hand, the light projected from the projection lens 11 of the stereoscopic image display projector 1 forms an image on the screen 2, then diffuses through the screen 2, enters the lens array 3, and moves from the lens array 3 to the pixel position. Correspondingly, it is projected on the space as a group of rays substantially parallel to different directions. At this time, when the distance between the lens array 3 and the screen 2 is shorter than the focal length of the lens array 3, the light beam emitted from the lens array 3 becomes divergent light as shown in FIG. In this state, only a blurred aerial image 32 as shown in FIG. 5 can be displayed as a real image in front of the lens array 3.

  However, since the diverging light path is condensed in the direction opposite to the traveling direction of the light, that is, in the direction toward the back of the screen 2 (on the stereoscopic image display projector 1 side), the lens is formed by the above-described extension. A spatial image (not shown) as a virtual image with apparently less blur can be displayed at a position behind the array 3.

  Therefore, when the content to be displayed in the back is displayed on the screen 2, or the viewing area is made as wide as possible at the expense of the projection amount of the stereoscopic image (by displaying the stereoscopic image behind the screen 2). When a large number of people want to observe, the stereoscopic image display projector 1 monitors the spot of the laser beam 41 on the screen 2 with the camera 5, and the distance between the lens array 3 and the screen 2 based on the monitor image signal. 5 is generated, and the drive mechanism 6 shown in FIGS. 1 and 4 is supplied with the control signal to control the drive.

  In this case, if the lens array 3 is slightly displaced by the drive mechanism 6 so that the distance between the lens array 3 and the screen 2 is widened, the diameter of the spot on the screen 2 is further reduced, so that the distance is too narrow.

  FIG. 6 illustrates the case where the distance between the lens array 3 and the screen 2 is the focal length of the lens array 3. In this case, the laser light 41 emitted from the laser light source 4 (laser light source 40 in FIG. 4) is condensed on the screen 2 as shown in FIG. At this time, the light rays from the element image projected on the screen 2 are emitted in a substantially parallel state by the lens array 3, and the aerial image 33 is formed at the intersection of light beams having the same diameter as the individual lens arrays 3 at the diffraction limit. Is formed.

  In the state of being emitted as parallel rays as shown in FIG. 6, the virtual image behind the screen 2 described above also has an intersection of almost the same size, so that the stereoscopic image to be displayed extends across the lens array 3. Suitable for

  FIG. 7 illustrates a case where the distance between the lens array 3 and the screen 2 is longer than the focal length of the lens array 3. In this case, as shown in FIG. 7, the laser light 41 emitted from the laser light source 4 (laser light source 40 in FIG. 4) is condensed on the screen 2 in a defocused state.

  On the other hand, the light projected from the projection lens 11 of the stereoscopic image display projector 1 forms an image on the screen 2, then diffuses through the screen 2, enters the lens array 3, and moves from the lens array 3 to the pixel position. Correspondingly, it is projected on the space as a group of rays substantially parallel to different directions. At this time, when the distance between the lens array 3 and the screen 2 is longer than the focal length of the lens array 3, as shown in FIG. 7, the light rays emitted from the lens array 3 are more than in the case shown in FIG. An aerial image 34 is formed at the intersection of light beams having a diameter smaller than the diameter of the lens array 3 at a position far from the lens array 3.

  Therefore, although the viewing area of the observer who observes the aerial image 34 (the eyeball is indicated by 7) is narrowed, in order to make a stereoscopic image pop out as much as possible, as shown in FIG. Is longer than the focal length of the lens array 3, the projector 1 according to the present embodiment uses the control signal of the drive mechanism 6 shown in FIGS. 1 and 4 based on the monitor image signal of the camera 5. Generate and control the drive mechanism 6.

  In this case, if the lens array 3 is slightly displaced by the drive mechanism 6 so that the distance between the lens array 3 and the screen 2 is widened, the diameter of the spot on the screen 2 is further increased, so that the distance is too wide.

  Next, a viewing area that is a range in which a stereoscopic image formed by the stereoscopic display projector 1 of the present invention can be observed will be described with reference to FIG. In FIG. 8, only the chief rays from the outermost pixel are drawn out of a number of rays emitted from the element image arranged on the screen 2 behind the lens array 3.

  In FIG. 8, the range of the thick V-shaped solid line indicates the viewing zone 8. This viewing zone 8 shows the range in which the observer can see the stereoscopic image while moving. If the angle (full angle) where the two thick lines intersect is represented by Ω, the viewing zone angle Ω is Depending on the distance between the lens array 3 and the screen 2 (referred to as g) and the lens pitch of the lens array 3 (referred to as PL), the following relationship is expressed from the geometrical relationship shown in FIG.

Ω = 2 tan ^-1 (2PL / g)
That is, when the distance g between the lens array 3 and the screen 2 is reduced, the viewing zone angle Ω is increased. Conversely, when the distance g between the lens array 3 and the screen 2 is increased, the viewing zone angle Ω is reduced. Therefore, the viewing zone 8 is adjusted by changing the distance g between the lens array 3 and the screen 2.

  When the eyeball 7 of the observer is in the viewing area 8, a stereoscopic image that continuously changes according to the observation position can be observed. When the eyeball 7 is out of the viewing zone 8, the element image is viewed through the adjacent lens, and the characteristics of the stereoscopic image deteriorate. Further, stereoscopic image switching (flipping) occurs at the boundary of the viewing zone 8. Therefore, how much the viewing area 8 is set is an important adjustment item in the stereoscopic display device.

  The stereoscopic image display projector 1 according to the present invention not only optimizes the divergence angle of the light beam from the lens array 3 described above, but also enables the viewing zone 8 to be automatically optimized. That is, as shown in FIG. 8, when the distance between the lens array 3 and the screen 2 is shorter than the focal length of the lens array 3, the viewing zone 8 becomes wider than when the distance matches the focal length. In this case, the light emitted from the lens array 3 is divergent light as shown in FIG. 5, and a stereoscopic image is displayed on the back side of the screen 2, and the front side cannot be displayed, but can be observed simultaneously. The number of observers can be increased.

  In conventional projectors for stereoscopic image display, the viewing zone is fixed, but the present invention enables the viewing zone to be automatically enlarged according to the situation. Conversely, when the number of observers is small, the viewing area is deliberately narrowed, thereby increasing the light density in the viewing area and increasing the amount of projection of the stereoscopic image. This corresponds to the light beam state of FIG.

  In order to automatically adjust the viewing zone, the current distance between the lens array 3 and the screen 2 is recognized, and the adjustment is performed by the drive mechanism 6 shown in FIG. This interval is determined whether it is longer or shorter than the focal length by monitoring the inclination (differential coefficient) of the change amount of the spot size on the screen 2 with the camera 5 when the driving mechanism 6 changes in any direction. As described above, this can be done.

  When the distance g between the lens array 3 and the screen 2 is reduced, the size of the image on the screen 2 (element image behind one lens) needs to be slightly larger than the lens pitch PL, and vice versa. When the interval g is increased, the size of the element image needs to be slightly smaller than the lens pitch PL. In the present embodiment, the zoom of the projection lens 11 is adjusted by monitoring the slope (differential coefficient) of the change amount of the spot size on the screen 2 with the camera 5, and the adjustment of the element image size projected on the screen 2 is adjusted. I do.

  The present invention is not limited to the above embodiment. For example, the lens array 3 is used as the deflection optical element array in the above embodiment, but other than this, a diffractive optical element (light diffraction phenomenon) is used. Used elements), curved mirror arrays (elements utilizing light reflection), aperture arrays, and the like. Further, instead of an element such as the lens array 3 having a deflecting function in the horizontal direction, the vertical direction, and the oblique direction, a known lenticular lens that is a deflecting optical element array having a deflecting function only in the horizontal direction, or a known one. It goes without saying that the present invention can be applied to a naked-eye stereoscopic display without parallax in the vertical direction using a parallax barrier or the like.

1 is a system configuration diagram of an example of a stereoscopic image display system including a stereoscopic image display projector of the present invention. It is a figure which shows the mode of the image formation according to the space | interval of a screen and a lens array. It is a block diagram of an embodiment of a stereoscopic image display projector of the present invention. 1 is a system configuration diagram of an embodiment of a stereoscopic image display system including a stereoscopic image display projector of the present invention. It is a figure which shows the state (the 1) of the space | interval of the lens array and screen explaining the adjustment method by this invention. It is a figure which shows the state (the 2) of the space | interval of the lens array and screen explaining the adjustment method by this invention. It is a figure which shows the state (the 3) of the space | interval of the lens array and screen explaining the adjustment method by this invention. It is a figure for demonstrating the viewing area which is the range which can observe the stereo image which the projector for stereoscopic image display of this invention forms.

Explanation of symbols

1 3D image display projector 2 Screen (Diffusion surface of screen in a broad sense)
3. Lens array (surface with wide screen deflection function)
4, 40 Laser light source 41, 411, 412, 413, 414 Laser light (light beam)
DESCRIPTION OF SYMBOLS 5 Camera 6 Drive mechanism 7 Eyeball of observer 8 Viewing area 11 Projection lens 31, 32, 33, 34 Aerial image 101 Light source 102 _{1 to} 102 _n Illumination optical system 103 _{1 to} 103 _n Liquid crystal display element 104 Projection lens unit 105 Imaging element 106 signal processing unit 107 arithmetic circuit 108 control signal generation unit 109 input unit

Claims (3)

Irradiating incoherent light of a two-dimensional image to the vicinity of the first surface of the optical member having the first surface as a diffusion surface and the second surface facing the first surface as a surface having a light deflection function. A stereoscopic image display projector for condensing multi-directional light beams at a spatial position near the second surface and reproducing a three-dimensional spatial image according to the principle of integral photography,
Control signal generating means for generating a control signal for driving a driving mechanism for controlling a relative distance or a relative inclination between the first surface and the second surface of the optical member;
The driving mechanism is driven by the control signal to change the optical characteristics of the optical member, thereby controlling the spread angle of the light beam emitted from the second surface and viewing the aerial image. A stereoscopic image display projector characterized by controlling a region. Imaging means for imaging a spot formed on the first surface by injecting coherent light from the second surface side of the optical member;
Detection means for detecting a relative interval or a relative inclination between the first surface and the second surface of the optical member based on a monitor image signal of the spot obtained by imaging by the imaging unit; Have
The drive mechanism is controlled via the control signal generation unit according to a relative distance or a relative inclination between the first surface and the second surface detected by the detection unit. Item 3. A stereoscopic image display projector according to Item 1. The screen is irradiated with incoherent light of a two-dimensional image to form a large number of flat images on the screen, the large number of flat images are transmitted through the screen and diffused, and the deflection is provided so as to be opposed to the screen. The diffused light from the screen is projected as a group of light beams that are substantially parallel in different directions depending on the pixel position by the optical element array, and these light beam groups are condensed in space, and are three-dimensionally based on the principle of integral photography. A stereoscopic image display projector for reproducing a spatial image of
Imaging means for imaging one or two or more spots formed on the screen together with the planar image by making substantially parallel light rays that are coherent light incident on the deflection optical element array;
Detecting means for detecting a relative interval or a relative inclination between the screen and the deflection optical element array based on a monitor image signal of the spot obtained by imaging by the imaging means;
A control signal for controlling a drive mechanism that varies the interval and inclination between the screen and the deflection optical element array is generated according to the interval or inclination between the screen and the deflection optical element array detected by the detection means. Control signal generation means, and the control signal generation means controls one or both of a spread angle of light emitted from the deflection optical element array into space and a viewing area of an observer observing the aerial image. A control signal for generating a stereoscopic image display.

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