JP2005266568A - Three-dimensional display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-dimensional display system whose structure is simple, whose mechanical parts are hardly deteriorated and with which a distinct stereoscopic video is observed even when an observer observes the video from an oblique direction or observer's head or both eyes are moved right and left. <P>SOLUTION: The three-dimensional display system is constituted of a picture display means for displaying a picture for a left eye and a picture for a right eye on an LCD, an observer detection means for detecting the positions and the right-and-left movement of observer's head and both eyes, a light source irradiating direction changing means for irradiating a Fresnel lens installed on the back of the LCD so as to irradiate the picture for the left eye with a light source for a left eye and also irradiate the picture for the right eye with a light source for a right eye, and also changing the irradiating directions of the light source for the left eye and the light source for the right eye by following the moving direction and the moving amount of observer's head and both eyes when they are moved right and left, and a controller for performing the synchronous control of the electromechanical operation of the picture display means, the observer detection means and the light source irradiating direction changing means. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a three-dimensional display capable of observing a stereoscopic image, and in particular, a tertiary image capable of observing a clear stereoscopic image even when the observer observes from an oblique direction or the head and both eyes move left and right. It relates to the original display system.

  Conventionally, as a method of a three-dimensional display for observing a stereoscopic image, a method in which an observer wears polarized glasses, a method in which a lenticular lens is arranged on the front of the display, and a method without using polarized glasses is used. There is.

  In the former method, an LCD shutter is arranged on the front of the display, and the left eye image and the right eye image whose polarization state is switched are alternately displayed on the display, and the observer is separated into right and left through polarizing glasses. The stereoscopic image is recognized by observing the parallax images of the left-eye image and the right-eye image. This method has a disadvantage that the observer must always wear polarized glasses.

  In the latter method, a lenticular lens is arranged on the front of the display so that the parallax images of the left-eye image and the right-eye image have directivity, and the images entering the left and right eyes are spatially separated. Thus, a stereoscopic image is recognized. In this method, it is not necessary to wear polarized glasses, but the width of the region that can be stereoscopically viewed is as narrow as about 65 mm, which is the center distance between the eyes of the observer, and the observer does not shake the head and eyes. There was a drawback that it had to be observed in a fixed manner. In order to deal with this drawback, in Japanese Patent Laid-Open Nos. 02-44955 and 09-185015, the movement of the observer's head is detected, and the movement of the lenticular lens to the left and right with respect to the display is controlled by a slide mechanism. It has been proposed to expand the stereoscopic region by tracking.

Furthermore, in the latter method, the semicircular cylindrical lens, which is a constituent element of the lenticular lens, has field curvature aberration, and image blurring occurs when the observer observes from an oblique direction, and the left eye There is a drawback that crosstalk occurs when the display image and the right-eye image are rewritten. In order to cope with this drawback, in Japanese Patent Laid-Open No. 2000-138951, a linear Fresnel lens (equivalent to a lenticular lens) is arranged on the back of an LCD (Liquid Crystal Display), and a light source is arranged behind the linear Fresnel lens to display There has been proposed a three-dimensional display that performs rewriting display in a time-sharing manner while changing the irradiation direction of the light source with a galvanometer mirror following the line sequential scanning of the image.
JP 02-44955 JP 09-185015 JP 2000-138951 A

  However, the head tracking method in the three-dimensional display using the lenticular lens needs to control the movement of the lenticular lens to the left and right with respect to the display, and requires a linear motor, a cam mechanism and the like as a slide mechanism. For this reason, there existed a fault that it became large and complicated mechanically.

  In addition, the three-dimensional display using the linear Fresnel lens and the galvanometer mirror needs to change the irradiation direction of the light source following the line-sequential scanning of the display image linearly, and requires a rotating device using a servo motor or the like. It becomes. Here, in each of the left-eye and right-eye rotation devices, it is necessary to perform rotation control following the sawtooth signal 60 times per second in order to display the left-eye image and the right-eye image. However, since the rotating device performs high-speed operation, mechanical parts such as a servo motor deteriorate quickly.

  The present invention has been made to solve the above-described drawbacks, and has a simple structure with little deterioration of mechanical parts. Further, an observer can observe from an oblique direction, and the head and both eyes are left and right. An object of the present invention is to provide a three-dimensional display system capable of observing a clear stereoscopic image even when moved.

  In order to solve the above problems, in the three-dimensional display system of the present invention, image display means for displaying an image for the left eye and an image for the right eye on the LCD, the positions of the observer's head and eyes, An observer detection means for detecting movement and a left-eye light source for a left-eye image and a right-eye light source for a right-eye image and a right-eye light source for a Fresnel lens installed on the back of the LCD Light source irradiation direction changing means for changing the irradiation direction of the left eye light source and right eye light source following the movement direction and movement amount when the head and both eyes move left and right, and the image display means And a control device for performing synchronous control of the electromechanical operation of the observer detecting means and the light source irradiation direction changing means.

  According to the present invention, when the observer's head and both eyes move left and right in the light source irradiation direction changing means, the irradiation direction of the left eye light source and the right eye light source follows following the movement direction and amount of movement. The change is only made with a rotating device on which a triangular mirror is placed, and the structure is simplified. In addition, the rotation control for changing the irradiation direction of the light source for the left eye and the light source for the right eye is only when the observer's head and both eyes move to the left and right. There is also an effect that it can withstand long-term use. In addition, since no lenticular lens is placed in front of the display, there is no image blur or crosstalk even when the observer observes from an oblique direction, and even when the head and both eyes move left and right due to head tracking. This produces a great effect of being able to observe various stereoscopic images. Further, in the present invention, a stereoscopic image is recognized using two LDCs in order to display an image for the left eye and an image for the right eye. There is an effect that a planar image can be seen.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of the configuration of the three-dimensional display system of the present invention, and FIG. 3 is a block circuit diagram of a control device in the three-dimensional display system of the present invention.

  As an exemplary embodiment of the present invention, as shown in FIG. 1, image display means for displaying a stereoscopic image is arranged on the front left and right of the observer 11. The image display means arranges the LCD 3L for displaying the image for the left eye and the LCD 3R for displaying the image for the right eye slightly inward, and condenses the light source for the left eye from the back of the LCD 3L. The Fresnel lens 5L for irradiating and the Fresnel lens 5R for condensing and irradiating the light source for the right eye from the back of the LCD 3R, and the image data output device 4L for outputting the image data for the left eye to the LCD 3L The image data output device 4R for outputting right-eye image data to the LCD 3R is configured. The image data output devices 4L and 4R are preferably personal computers or DVDs, but are not particularly limited.

  Next, an observer detection means is arranged at the center of the LCDs 3L and 3R. The observer detection means is preferably a CCD camera 2 for photographing the head and both eyes of the observer 11 in order to detect the position of the head and eyes of the observer 11 and the amount of left and right movement by image processing. Although there is no particular limitation, other detection means may be used. FIG. 2 is a front view of a display incorporating the three-dimensional display system of the present invention, and shows an example in which the CCD camera 2 is installed at the upper center of the displays 12L and 12R. Further, the display 12L, 12R may be structured in a single housing.

  Next, light source irradiation direction changing means is disposed at the rear of the Fresnel lenses 5L and 5R. The light source irradiation direction changing means irradiates the left-eye image with the left-eye light source and the right-eye image with the right-eye light source, and moves the observer's 11 head and both eyes when moving left and right. In order to follow and change the irradiation direction of the light source for the left eye and the light source for the right eye following the direction and the amount of movement, the light is emitted from the lens 7L and the light source device 6R for collecting the light source emitted from the light source device 6L. A lens 7R for condensing the light source, a triangular mirror 8 for reflecting the light source for the left eye to the mirror 9L and the light source for the right eye to the mirror 9R at the focal length positions of the lenses 7L and 7R, and the triangular mirror 8 is a rotating device 10 for rotating the head 8 and the eyes of the observer 11 in accordance with the moving direction and moving amount when the head and both eyes move to the left and right, and the light source for the left eye reflected by the triangular mirror 8. Mirror 9L for irradiating lens 5L and right eye Mirror 9R each Fresnel lens 9L for irradiating a light on the Fresnel lens 5R, install and configure the rear of the 9R.

  In addition, a control device 1 for performing synchronous control of the electromechanical operations of the image display means, the observer detection means, and the light source irradiation direction changing means is disposed. The control device 1 inputs the head and binocular images of the observer 11 photographed by the CCD camera 2, and detects an image processing unit 13 for detecting the right and left movement directions and movement amounts compared to the reference image on the front. A rotation control unit 15 for performing synchronous control of the rotation device 10 that rotates the triangular mirror 8 following the movement direction and movement amount of the left and right, the image processing unit 13 and the rotation control unit 15. And a circuit control unit 14 for controlling the control device 1 itself.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of the configuration of the three-dimensional display system of the present invention, and LCDs 3L and 3R are installed on the front and right of the observer 11. Further, Fresnel lenses 5L and 3R are installed on the back surfaces of the LCDs 3L and 3R, respectively, and a CCD camera 2 is installed in the upper center. Further, the image data output devices 4L and 4R are connected to the LCDs 3L and 3R, respectively, so that the left eye image can be displayed on the LCD 3L and the right eye image can be displayed on the LCD 3R. The image data output devices 4L and 4R receive the image switching signal output from the control device 1, and perform display switching between the left-eye image and the right-eye image in synchronization with the system. The display switching speed of the left eye image and the right eye image is preferably 60 frames, that is, the left eye image and the right eye image are preferably displayed alternately 30 times per second.

  Here, when the image data output device 4L outputs the image data for the left eye to the LCD 3L and the LCD 3L displays the image for the left eye, the light source emitted from the light source device 6L is condensed by the lens 7L, and the focal length is increased. The triangular mirror 8 at the position is irradiated. As the light source for the left eye, the light source is reflected by the triangular mirror 8 and the mirror 9L in the direction of the solid line in the figure and irradiates the Fresnel lens 5L.

  Further, when the image data output device 4R outputs the right eye image data to the LCD 3R and the LCD 3R displays the right eye image, the light source emitted from the light source device 6R is condensed by the lens 7R, and the focal length position The triangular mirror 8 is irradiated. As the light source for the right eye, the light source is reflected by the triangular mirror 8 and the mirror 9R in the direction of the dotted line in the figure and irradiates the Fresnel lens 5R.

  The position of the triangular mirror 8, that is, the reflection angle is normally fixed, but when the head and both eyes of the observer 11 move left and right, the irradiation directions of the light source for the left eye and the light source for the right eye are changed accordingly. There is a need. In this case, the tracking angle corresponding to the moving direction and the moving amount is detected by the observer detecting means. FIG. 4 is an explanatory view of the rotation operation of the triangular mirror in the three-dimensional display system of the present invention. When the observer 11 moves to the left, the triangular mirror 8 follows the tracking angle and rotates as shown in FIG. The left-eye light source is slightly moved left from the irradiation position indicated by the solid line arrow to the irradiation position indicated by the one-dot chain line arrow, and the right-eye light source is indicated by the dotted line arrow in the figure. It slightly moves left from the irradiation position shown to the irradiation position indicated by the two-dot chain line arrow. When the observer 11 moves to the right, as shown in (b), the triangular mirror 8 follows the tracking angle and is rotated to the right by the rotating device 10, and the light source for the left eye is indicated by a solid arrow in the figure. The right eye light source moves slightly to the irradiation position indicated by the two-dot chain line arrow from the irradiation position indicated by the two-dot chain line arrow.

  When the left eye image is displayed on the LCD 3L as described above, the left eye image is polarized by the left eye light source irradiated on the Fresnel lens 5L, and the observer is shown by the solid line arrow in FIG. When the image is formed on the left eye 11 and the right eye image is displayed on the LCD 3R, the right eye image is polarized by the right eye light source irradiated on the Fresnel lens 5R, and the observer is shown by the dotted arrow in the figure. 11 images are formed on the right eye, and a stereoscopic image can be recognized from the parallax images of the left eye image and the right eye image. In addition, a clear stereoscopic image can be recognized by the tracking function even if the observer's 11 head and both eyes move left and right. According to this method, the rotation control of the triangular mirror 8 is performed only when the observer's 11 head and both eyes move left and right, and the rotation device 10 hardly deteriorates.

  The three-dimensional display system of the present invention can be used in any system for the purpose of stereoscopic video, such as a television or personal computer monitor.

It is a block diagram of the configuration of the three-dimensional display system of the present invention. It is a front view of the display incorporating the three-dimensional display system of this invention. It is a block circuit diagram of the control apparatus in the three-dimensional display system of this invention. It is explanatory drawing of rotation operation | movement of the triangular mirror in the three-dimensional display system of this invention.

Explanation of symbols

1 Control device 2 CCD camera 3 LCD
4 Image data output device 5 Fresnel lens 6 Light source device 7 Lens 8 Triangular mirror 9 Mirror 10 Rotating device 11 Observer 12 Display 13 Image processing unit 14 Circuit control unit 15 Rotation control unit

Claims (2)

Image display means for displaying left-eye and right-eye images on the LCD, observer detection means for detecting the position and left-right movement of the observer's head and eyes, and installation on the back of the LCD When the left-eye light source is irradiated to the left-eye image and the right-eye light source is irradiated to the right-eye image, and the observer's head and eyes move to the left and right, the moving direction and amount of movement The light source irradiation direction changing means for changing the irradiation directions of the left eye light source and the right eye light source, and the synchronization of the electromechanical operations of the image display means, the observer detection means, and the light source irradiation direction change means. Consists of a control device etc. for performing control,
The image display means arranges the LCD (3L) for displaying the image for the left eye and the LCD (3R) for displaying the image for the right eye slightly inward, from the back of the LCD (3L). A Fresnel lens (5L) for condensing and irradiating the light source for the left eye, a Fresnel lens (5R) for condensing and irradiating the light source for the right eye from the back of the LCD (3R), and the LCD (3L) ) With an image data output device (4L) for outputting image data for the left eye and an image data output device (4R) for outputting image data for the right eye to the LCD (3R),
When the light source irradiation direction changing means irradiates the left eye light source to the left eye image and the right eye light source to the right eye image and the head and eyes of the observer (11) move left and right A lens (7L) and a light source for condensing the light source emitted from the light source device (6L) to follow and change the irradiation direction of the left eye light source and the right eye light source following the movement direction and the movement amount. A lens (7R) for condensing the light source emitted from the device (6R), a left eye light source mirror (9L) and a right eye light source mirror at the focal length position of the lens (7L, 7R) 9R), and the triangular mirror (8) is rotated in accordance with the moving direction and moving amount when the observer's (11) head and eyes move to the left and right. And a light source for the left eye reflected by the triangular mirror (8) A mirror (9L) for irradiating the Fresnel lens (5L) and a mirror (9R) for irradiating the Fresnel lens (5R) with the light source for the right eye are installed at the rear of each Fresnel lens (9L, 9R). The structure is simple and there is little deterioration of the mechanical parts.Furthermore, it is characterized in that a clear stereoscopic image can be observed even when the observer observes from an oblique direction or the head and both eyes move left and right. 3D display system.   The control device (1) inputs the head and binocular images of the observer (11) photographed by the CCD camera (2), and detects the right and left movement directions and movement amounts compared to the front reference image. Image processing unit (13) and a rotation control unit (15) for performing synchronous control of the rotation device (10) that rotates the triangular mirror (8) following the movement direction and movement amount of the left and right. And a circuit control unit (14) for controlling the image processing unit (13), the rotation control unit (15), and the control device (1) itself. The three-dimensional display system described in 1.

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