JP2012058291A - Stereoscopic image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereoscopic image display device obtaining good image quality with low power consumption as well as having the background of the device seen through in the stereoscopic image display device which can be observed by the naked eyes.SOLUTION: The composition of the stereoscopic image display device includes: a light source emitting beams with directivity; beam scanning means 3 deflecting the beams emitted from the light source in an arbitrary direction based on a control signal; and a beam deflection optical system 4 deflecting the beams according to the position and angle of incident beams. In this case, a beam reproduction unit 2 is composed to have the light source, the beam scanning means 3 and the beam deflection optical system 4 fixed so that the positional relationships to each other are not moved. In addition, the beam reproduction unit 2 is rotated by a rotor plate 1 synchronizing with control of the light source and the beam deflection means 3.

Description

  The present invention relates to a stereoscopic video display device, and more particularly to a stereoscopic video display device that can be observed with the naked eye.

  Conventionally, various attempts have been made for techniques for expressing stereoscopic images, and image display methods relating to stereoscopic images have been studied and put into practical use in many fields that handle images such as movies, television, and entertainment. Yes.

  Among three-dimensional video display methods, in particular, display methods such as the integral photography method or the light beam reproduction method can reproduce not only the parallax but also the focal position of the object, so that a more realistic video can be expressed. However, in these stereoscopic image display methods, it is necessary to express light rays radiated from each pixel in each direction in the output image, and the corresponding stereoscopic image display device needs to control the direction of the output light.

  As a conventional example of the stereoscopic video display apparatus, there is a stereoscopic video display apparatus disclosed in Patent Document 1. In patent document 1, it is comprised with the display unit which consists of several LED and one slit. In each display unit, the luminous flux in each direction emitted from the slit corresponds to each LED. By arranging this display unit in a circle and rotating it, an all-around stereoscopic display capable of naked eye observation is performed.

  Further, the all-round stereoscopic display device of Non-Patent Document 1 is configured by LED arrays and slits (parallax barriers) arranged in a circle. The LED array and the slit rotate in opposite directions, and the slit rotates faster than the LED array. By synchronizing the LED light emission in accordance with the position of the LED and the slit and controlling the direction and intensity of the light beam emitted from each slit, an all-around stereoscopic display capable of naked eye observation is performed as in Patent Document 1.

JP-A-10-97013

T. Endo, et al. , “Ray-Based Acqusition and Reproduction of 360-degree 3D Images”, IDW’09, p2037 (2009)

  In the example shown in Patent Document 1 or Non-Patent Document 1, in order to display a more natural stereoscopic image, it is necessary to narrow the width of the slit and improve the angular resolution of the emitted light. In that case, since the utilization efficiency of LED light falls according to the width | variety of a slit, the electric power required in order to obtain desired brightness increases.

  In the above example, since the stereoscopic image display device has a cylindrical shape made up of the light shielding plates constituting the slits, the images that can be displayed are limited to those in which an object floats in the cylindrical black space.

  It is an object of the present invention to provide a stereoscopic image display apparatus that can be observed with the naked eye and a stereoscopic image display apparatus that can express good image quality with low power consumption and that can be seen through the background of the apparatus.

  A stereoscopic image display device of the present invention for solving the above-described problems is a light source that emits light having directivity, a light beam scanning unit that deflects light emitted from the light source in an arbitrary direction based on a control signal, In a stereoscopic image display apparatus having a light deflection optical system that deflects light according to the position and angle of incident light, the light source, the light scanning means, and the light deflection optical system are fixed so that their positional relationship does not move. A reproduction unit is configured, and a stereoscopic image is displayed by moving the light beam reproduction unit in synchronization with the control of the light source and the light beam deflecting means.

  In addition, the light beam deflecting optical system is an optical system that deflects the incident light beam in a direction corresponding to the incident position and angle in one of the horizontal direction and the vertical direction, and the incident light beam in the other direction. An optical system for diffusing.

  According to the present invention, since there is no light shielding by a slit or the like and the output of the light source can be used 100%, it is possible to display an image with low power consumption. In addition, since there is no shielding object other than the light deflection optical system in the display area, it is possible to observe the stereoscopic image and the background simultaneously.

It is the schematic which shows the basic composition in this invention. In this invention, it is an example of a structure of the light beam reproduction unit when parallax is not set in the vertical direction. In this invention, it is an example of a structure of the light beam reproduction unit when parallax is not set in the vertical direction. In this invention, it is a structural example at the time of using a biaxial MEMS mirror as a beam scanning means. In this invention, it is a structural example at the time of using a convex lens in a horizontal direction as a light beam deflection optical system. In this invention, it is an upper surface structural example of the light beam reproducing unit which combined the lens and the mirror. In this invention, it is a side surface structural example of the light reproduction unit which combined the lens and the mirror. In this invention, it is a structural example at the time of using a convex mirror in a horizontal direction as a light deflection optical system. In this invention, it is a structural example at the time of performing light deflection of a horizontal direction directly with a MEMS mirror. In this invention, it is a structural example of the light beam deflection | deviation optical system in case parallax is not set to a perpendicular direction. In this invention, it is a structural example at the time of adding an auxiliary lens to the structure of FIG. In this invention, it is a structural example of the light beam deflection | deviation optical system in the case of setting parallax to a perpendicular direction. FIG. 4 is a diagram showing a locus of light rays incident on a light deflection optical system in one embodiment of the present invention. In this invention, it is one locus | trajectory of the light ray which injects into the light deflection optical system of the Example using the return of light ray scanning. In this invention, it is the other locus | trajectory of the light ray which injects into the light deflection optical system of the Example using the return of light ray scanning. In the present invention, it is a locus of light rays incident on a light deflection optical system in an embodiment in which horizontal scanning is performed for each pixel in the vertical direction. In this invention, it is a structural example at the time of arrange | positioning two or more light reproduction units. In this invention, it is a structural example at the time of providing the several light source and light beam scanning means with respect to one light beam reproduction | regeneration unit. In this invention, it is a structural example at the time of installing a some light source and light beam scanning means, or a some light beam reproduction | regeneration unit. In this invention, it is a structural example in the case of making the background of a three-dimensional image opaque. In this invention, it is a structural example in the case of enabling observation of both a three-dimensional image and an exhibit. 1 is one embodiment of a light beam reproduction unit moving track in the present invention. It is another Example of the light ray reproduction unit movement track | orbit in this invention.

  Embodiments of the present invention will be described below. FIG. 1 is a schematic view (top view) showing a basic configuration in the present invention. This configuration has a light beam reproduction unit 2 comprising a light source and light beam scanning means 3 and a light beam deflection optical system 4, and the light beam reproduction unit 2 is rotated by a rotating plate 1. A light beam having directivity is generated by the light source, and the light beam is incident on the deflection optical system 4 at a desired position and angle by the light beam scanning means. The deflecting optical system 4 deflects the light according to the incident position / angle of the light. As a result, the output direction of the light beam can be controlled by the light beam scanning means and the deflection optical system 4. Furthermore, by rotating the light beam reproduction unit 2 while outputting light beams in each direction by scanning, it is possible to reproduce light beams of a stereoscopic image with respect to all horizontal 360 ° directions.

  FIG. 2 is a side view of the light beam reproduction unit 2 when no parallax is set in the vertical direction. A light beam is scanned in the vertical direction by the light beam scanning means, and the pixels in the vertical direction are expressed by synchronizing the output of the light source thereto. By diffusing the light beam in the vertical direction in the deflecting optical system 4, an image can be observed over a wide range in the vertical direction.

  FIG. 3 is a side view of the light beam reproduction unit 2 when parallax is set also in the vertical direction. The deflection optical system 4 has a structure in which deflection blocks 5 are arranged in the vertical direction, and light beams are deflected in each deflection block according to the incident position and direction.

  A specific example of the light source is a laser light source, but in addition, a configuration in which directivity is given to output light by using a slit, a lens, or the like for the LED light source may be used. In addition to LED light sources, fluorescent tubes, discharge lamps, or phosphors excited by a laser or LED whose output wavelength is shorter than the emission wavelength of the phosphor are used as light sources and output using slits, lenses, etc. You may make it the structure which gave directivity to light.

  Specific examples of the beam scanning means include an optical element using an electro-optic effect and an acousto-optic effect, a galvanometer mirror, a MEMS mirror, and the like. FIG. 4 shows an embodiment in the case of using a 2-axis MEMS mirror.

  FIG. 5 shows an embodiment in which a convex lens is used in the horizontal direction as the light deflection optical system 4 (top view). As is apparent from the figure, the direction of the light beam can be controlled by the incident position and angle to the convex lens. A concave lens may be used instead of the convex lens.

  When combined with a mirror 9 that is concave in the horizontal direction and convex in the vertical direction as shown in FIGS. 6 (a) and 6 (b), the length of the light reproducing unit 2 is shortened and deflected by the convex lens 8. It is possible to swing the angle of the emitted light over a wide range.

  FIG. 7 shows an embodiment in which a convex mirror 10 is used as the light deflection optical system 4 in the horizontal direction. By using a mirror instead of a lens, it is possible to suppress the deviation of light rays for each color due to chromatic aberration. A concave mirror may be used instead of the convex mirror. The mirror surface material may be a dielectric multilayer film in addition to a metal such as aluminum. In particular, when a dielectric multilayer film designed to reflect only the wavelength of the light source and transmit other wavelengths is used, shielding of the device background by the light deflection optical system 4 can be suppressed.

  FIG. 8 shows an embodiment in the case where the beam deflection in the horizontal direction is directly performed by the MEMS mirror. The light beam deflecting optical system 11 does not perform horizontal deflection but deflects only in the vertical direction. Although the shape of the cross section in the horizontal direction of the light deflection optical system 11 may be rectangular, chromatic aberration can be suppressed by making the shape centered on the MEMS mirror as shown in the figure.

  FIG. 9 shows an embodiment of the light deflection optical system 4 when no parallax is set in the vertical direction (side view). As shown in the figure, the lenticular lenses are arranged at a pitch approximately equal to or less than the width of the light beam to diffuse the light beam in the vertical direction. Although a convex lens is used in the figure, a concave lens may be used.

  Also, as shown in FIG. 10, the auxiliary lens 12 is installed immediately before the light beam is directed in the horizontal direction, so that the uniformity in the vertical direction for each pixel is improved and the observable range can be expanded. The auxiliary lens 12 may be integrated with the light deflection optical system 4.

  FIG. 11 shows an embodiment of the light beam deflecting optical system 4 when parallax is set in the vertical direction. By arranging the lenticular lenses at a pitch sufficiently larger than the width of the light beam, the light beam can be deflected according to the light beam incident position and angle in each lens. Although a convex lens is used in the figure, a concave lens may be used. Moreover, you may install the auxiliary lens 12 similarly to FIG.

  Hereinafter, an example of an operation method of the stereoscopic image display apparatus according to the present invention will be described. FIG. 12 shows the trajectory of light incident on the light deflection optical system 4 (front view). In this case, if the vertical scanning frequency is 20 kHz and the number of deflection azimuths is 10, the horizontal scanning frequency is 1 kHz. If the number of pixels in the vertical direction is 480, the modulation frequency required for the light source is about 19.2 MHz. Further, when the light beam scanning is performed every time the light beam reproducing unit 2 is rotated by 1 °, the rotation frequency of the light beam reproducing unit 2 is about 2.8 Hz.

  13 (a) and 13 (b) are alternately performed for each unit rotation angle of the light beam reproducing unit 2, and the return of the light beam scanning is also used for image output, so that the number of deflection azimuths and the light beam reproducing unit 2 The rotation angle resolution or the rotation frequency of the light beam reproduction unit 2 can be improved. Further, as shown in FIG. 14, horizontal scanning may be performed for each pixel in the vertical direction.

  FIG. 15 shows an embodiment in which a plurality of light beam reproducing units 2 are arranged. Depending on the number of light beam reproduction units 2, the number of deflection directions, the rotation angle resolution of the light beam reproduction unit 2, or the rotation frequency of the light beam reproduction unit 2 can be improved. When a lens is used for the light deflection optical system, chromatic aberration can be suppressed by forming the light beam reproduction unit 2 for each color and driving it for each color.

  FIG. 16 shows an embodiment in which one light beam reproduction unit has a plurality of light sources and light beam scanning means. Also in this case, the number of deflection azimuths, the rotational angle resolution of the light beam reproduction unit 2 or the rotation frequency of the light beam reproduction unit 2 can be improved in the same manner as described above.

  Further, the same effect can be obtained by installing a plurality of light sources, light beam scanning means, and a plurality of light beam reproduction units as shown in FIG.

  In the above embodiment, the background of the apparatus can be seen through, but on the other hand, it is possible to make the background of the stereoscopic image opaque by adopting the configuration shown in FIG. In the figure, the shielding wall 13 is rotated in synchronization with the light beam reproducing unit. Furthermore, if the light deflection optical system 4 is made to absorb light other than the light source wavelength by using a dye or a dielectric multilayer film, the background of the stereoscopic image can be made blacker. If antireflection processing such as AR coating is performed on the front surface of the light deflection optical system 4, reflection of external light is suppressed, and good visibility can be obtained for a stereoscopic image even in a bright room.

  The stereoscopic image display apparatus of the present invention can observe a stereoscopic image while seeing through the background of the apparatus. An example using this feature is shown in FIG. The figure is a cross-sectional view of the apparatus as viewed from the side. In this embodiment, an exhibition stand 14 is installed at the center of the apparatus, and an exhibit 15 can be installed thereon. The display table 14 is independent of the light beam reproduction unit, and can be fixed or rotated independently. In this embodiment, the observer can observe both the stereoscopic image output from the apparatus and the exhibit. Accordingly, it is possible to realize a display in which a stereoscopic image is superimposed on an exhibit.

  In the stereoscopic image display apparatus of the present invention, the light beam reproduction unit is not limited to concentric rotation, and may be a flat display as shown in FIGS.

DESCRIPTION OF SYMBOLS 1 ... Turntable, 2 ... Light beam reproduction unit, 3 ... Light source and light beam scanning means,
4 ... light deflection optical system, 5 ... deflection block, 6 ... light source, 7 ... MEMS mirror,
8 ... convex lens, 9 ... mirror, 10 ... convex mirror, 11 ... light deflection optical system,
12 ... Auxiliary lens, 13 ... Shielding wall, 14 ... Exhibition stand, 15 ... Exhibit

Claims (15)

A light source that emits a light beam having directivity, a light beam scanning unit that deflects the light beam emitted from the light source in an arbitrary direction based on a control signal, and a light beam deflection that deflects the light beam according to the position and angle of the incident light beam In a stereoscopic image display apparatus having an optical system,
The light source, the light beam scanning means, and the light beam deflection optical system constitute a light beam reproduction unit in a fixed positional relationship with each other,
A stereoscopic image display apparatus, wherein the light beam reproduction unit is moved in synchronization with control of a light source and light beam deflecting means.   The stereoscopic video display apparatus according to claim 1, wherein the light source is a laser.   The stereoscopic video display apparatus according to claim 1, wherein the light source includes a light generation device and a light control system that imparts directivity to light generated from the light generation device.   The stereoscopic video display apparatus according to claim 3, wherein the light control system includes a slit or a pinhole.   The stereoscopic video display apparatus according to claim 3, wherein the light control system is configured by a lens.   6. The stereoscopic video display device according to claim 3, wherein the light generation device is an LED.   6. The stereoscopic image display device according to claim 3, wherein the light generation device is composed of a phosphor and a phosphor excitation light source.   8. The stereoscopic image display apparatus according to claim 1, wherein the light beam scanning means is constituted by a MEMS mirror.   The stereoscopic image display device according to claim 1, wherein the light deflection optical system is an optical system that deflects incident light in a direction corresponding to an incident position / angle with respect to either one of a horizontal direction and a vertical direction. A stereoscopic image display apparatus characterized by being an optical system that diffuses incident light in the other direction.   10. The stereoscopic image display device according to claim 9, wherein the optical system for diffusing incident light is configured by a lens.   The stereoscopic image display device according to claim 1, wherein the light deflection optical system is configured by a lens using light refraction.   The stereoscopic image display apparatus according to claim 1, wherein the light deflection optical system is configured by a mirror using reflection of light.   11. The stereoscopic image display device according to claim 1, wherein the light deflection optical system is configured by a combination of a lens using light refraction and a mirror using light reflection. .   14. The stereoscopic image display apparatus according to claim 1, further comprising two or more light sources and light beam scanning means for one light deflection optical system.   15. The stereoscopic video display apparatus according to claim 1, further comprising a stage on which an exhibit can be placed inside a trajectory along which the light beam reproduction unit moves.

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