Patent Publication Number: US-2005122584-A1

Title: Stereoscopic two-dimensional image display device and method

Description:
CROSS REFERENCE OF RELATED APPLICATION  
      This application is based on and claims priority under 35 U.S.C. §119 with respect to Japanese Patent Application No. 2003-379190 filed on Nov. 7, 2003, the entire content of which is incorporated herein by reference.  
     BACKGROUND OF THE INVENTION  
      This invention relates to a stereoscopic two-dimensional image display device and method for spurious-stereoscopically displaying a two-dimensional image using a micro-lens array.  
      A stereoscopic two-dimensional image display device is known for displaying the spurious-stereoscopic image of a two-dimensional image in a space ahead of a micro-lens array which is arranged apart from the display plane or screen of the two-dimensional image by a predetermined distance (For example, JP-A-2001-255493, JP-A-2003-98479, JP-A-2002-77341 and JP-A-2003-156712).  
      Meanwhile, such previously known conventional stereoscopic two-dimensional image display devices only display a two-dimensional image stereoscopically. A viewer, therefore, can only view a displayed two-dimensional image in a passive attitude, and cannot take any action or approaching for the displayed two-dimensional image. The viewer could not perform an interactive communication with the displayed two-dimensional image so that amusement was not given to the viewer.  
     SUMMARY OF THE INVENTION  
      The problem that the invention is to solve is that the conventional stereoscopic two-dimensional image display device only displays a two-dimensional image stereoscopically, and a viewer cannot take any action for the stereoscopic two-dimensional image.  
      A stereoscopic two-dimensional image display device according to a first aspect of the invention is characterized by including: a stereoscopic image display unit having a display section with an image display plane on which an image is displayed and a micro-lens array arranged apart from the image display plane, for imaging light emitted from the image display plane onto an imaging plane in a space located oppositely to the display section with respect to the micro-lens array, thereby displaying a two-dimensional image on the imaging plane; a position detecting sensor for producing an output signal corresponding to the position of a detected object inserted in the space; and a control unit for changing the image displayed on the image display plane so that the stereoscopic two-dimensional image displayed on the imaging plane changes according to the output signal produced from the position detecting sensor.  
      The method for displaying a stereoscopic two-dimensional image according to a second aspect of the invention is characterized by including the steps of: displaying an image on an image display plane of a display section; imaging light emitted from the image display plane through a micro-lens array arranged from the image display plane onto an imaging plane in a space located oppositely to the display section with respect to the micro-lens array, thereby displaying a two-dimensional image on the imaging plane; producing a output signal corresponding to the position of a detected object inserted in the space; and changing the image displayed on the image display plane so that the stereoscopic two-dimensional image displayed on the imaging plane changes according to the output signal. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      These and other objects and advantages of this invention will become more fully apparent from the following detailed description taken with the accompanying drawings in which:  
       FIG. 1  is a schematic arrangement view of a stereoscopic two-dimensional image display device M according to an embodiment of this invention;  
       FIGS. 2A and 2B  are views showing a position detecting sensor included in the display device M;  FIG. 2A  is a front view of a two-dimensional position detecting sensor, and  FIG. 2B  is a schematic perspective view of a three-dimensional position detecting sensor;  
       FIG. 3  is an explanation view for explaining the control contents in the display device M;  
       FIG. 4  is an explanation view for explaining the other control contents in the display device M;  
       FIG. 5  is an explanation view for explaining still other control contents in the display device M;  
       FIG. 6  is an explanation view for explaining yet other control contents in the display device M;  
       FIG. 7  is a view showing an example of the means employed for image exchange in the display device M;  
       FIG. 8  is a view showing another example of the means employed for image exchange in the display device M;  
       FIG. 9  is a view showing still another example of the means employed for image exchange in the display device M;  
       FIG. 10  is a schematic arrangement view of a stereoscopic two-dimensional display device M 2  according to another embodiment of this invention; and  
       FIGS. 11A and 11B  are views showing an installed manner of the stereoscopic two-dimensional display device according to this invention;  FIG. 11A  is a perspective view thereof when seen from the front side, and  FIG. 11B  is a side sectional view thereof.  
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
      Now referring to the drawings, an explanation will be given of an embodiment of the stereoscopic two-dimensional image display device according to this invention.  
       FIG. 1  is a schematic arrangement view of a stereoscopic two-dimensional image display device M according to an embodiment of this invention.  
      The stereoscopic two-dimensional display device M according to this embodiment is a spurious-stereoscopic image display device which displays a two-dimensional image, which can be visually recognized as stereoscopic display by a viewer, in a predetermined plane in a space.  
      Concretely, the stereoscopic two-dimensional image display device M includes an enclosure  20 ; a display section  1  provided along an inner wall of the enclosure  20  and equipped with a image display plane  1 A on which a two-dimensional image is displayed; a micro-lens array  3  which is arranged apart by a predetermined distance from and ahead of the image display plane  1 A of the display section  1  within the enclosure  20  and images light R emitted from the image display plane  1 A onto a stereoscopic image display plane  2  in the space apart by a predetermined distance from and ahead of itself, thereby spurious-stereoscopically displaying the two-dimensional image on the stereoscopic image display plane  2 ; a position detecting sensor  4  arranged to correspond to the stereoscopic image display plane  2  and producing a signal corresponding to the position being subjected to outside physical approaching; and an audio output section (speaker)  5  for producing voice or sound such as effective sound and human voice.  
      The stereoscopic two-dimensional image display device M according to this embodiment includes, adjacently to the enclosure  20 , a display driving unit  6  for driving the display section  1 , a sensor driving/controlling unit  7  for driving the position detection sensor  4  and producing a detected signal through the position detecting sensor  4 , an audio driving unit  8  for driving the audio output section (speaker)  5 , an image creating unit  9  for creating the image data to be displayed, and a control unit  10  for executing general control for image display and audio output.  
      The display section  1 , which is formed of a general display such as a liquid crystal display, an EL panel or CRT, displays an image corresponding to a driving signal produced from the display driving unit  6  on the image display plane  1 A. Thus, the light corresponding to the image is emitted from the image display plane  1 A. In the illustrated example, in the display section which can be low-profiled, the image display plane  1 A may be a panel-type display such as a liquid crystal display or EL panel.  
      The micro-lens array  3  is composed of two lens array halves  3 A and  3 A which are arranged in parallel. Each lens array half  3 A,  3 A consists of a transparent base plate  3 B made of glass or resin with excellent transparency and a plurality of micro-convex lenses  3 C arranged to be adjacent in a matrix on both sides thereof. The optical axis of each of the micro-convex lenses  3 C formed on the one plane is adjusted to accord with that of each of the corresponding micro-convex lenses  3 C formed at the opposite positions on the other plane  
      The micro-lens array  3  is arranged in parallel to and apart by a predetermined distance (ex. imaging distance of micro-lens array  3 ) from the image display plane  1 A of the display section  1 . The micro-lens array  3  images light R corresponding to an image emitted from the image display plane  1 A of the display section  1  on a stereoscopic image display plane  2  on the side opposite to the image display plane  1 A and apart by a predetermined distance from therefrom, thereby displaying the image displayed on the image display plane  1 A on the stereoscopic image display plane  2  which is a spatial two-dimensional plane. Although the image thus imaged is a two-dimensional image, if it has a sense of depth or is displayed with emphasized contrast on a black background image on the display, is displayed to float in the space. Thus, the two-dimensional image appears as if a stereoscopic image was displayed for a viewer on the front. In short, the two-dimensional image displayed on the stereoscopic image display plane  2  is recognized as a stereoscopic two-dimensional image by the viewer. Accordingly, the display section  1  and the micro-lens array  3  constitute a stereoscopic image display section D in which the light corresponding to the image is imaged on the stereoscopic image display plane  2  (i.e. imaging plane).  
      The stereoscopic image display plane  2  is a plane set virtually in a space but not a substance. The stereoscopic image display plane  2  is a spatial plane which is defined according to the imaging distance of the micro-lens array  3 . On the front surface of the enclosure  20 , an opening  20 A is provided so that the image displayed on the stereoscopic image display plane  2  can be viewed from the front. On the plane of the opening and in the neighborhood thereof, the position detecting sensor  4  is arranged.  
      The position detecting sensor  4  is a sensor for detecting the position of an object or a human&#39;s hand (detected object) residing within a predetermined detected area. The position detecting sensor  4  may be, for example, a two-dimensional position detecting sensor  24  as shown in  FIG. 2A  or a three-dimensional position detecting sensor  34  as shown in  FIG. 2B .  
      The two-dimensional position detecting sensor  24  shown in  FIG. 2A  provides the stereoscopic image display plane  2  or the plane in the vicinity thereof as a detected plane (X-Y plane) which is a detected area. The two-dimensional position detecting sensor  24 , when a human&#39;s hand or an object such as a rod or plate traverses the detecting plane, detects the position thereof to produce a detected signal (XY coordinates). Incidentally, the detected point on the detected plane may be set to correspond to e.g. the pixel position in the display section  1 .  
      The two-dimensional position detecting sensor  24  may be various kinds of sensors. For example, where an optical sensor as shown in  FIG. 2A  is adopted, on the one and the other of two sides in parallel in a Y direction of four sides of a square frame which defines the detecting plane, a light emitting segment  24 Xa and a light receiving segment  24 Xb of an X-direction detecting line sensor are provided. Likewise, on the one and the other of two sides in parallel in an X direction, a light emitting segment  24 Ya and a light receiving segment  24 Yb of a Y-direction detecting line sensor are provided. Thus, the positional coordinates on the X-Y plane when the object traverses the detected plane can be estimated.  
      The three-dimensional position detecting sensor  34  shown in  FIG. 2B  serves to detect the Z-coordinate in a depth direction (position in a Z direction) as well as X-Y coordinates. Using the space including the stereoscopic image display plane  2  as a detected space which is a detected area, the three-dimensional position detecting sensor  34  detects the spatial position of the object inserted in the detected space to produce a detected signal (X, Y, Z coordinates). The three-dimensional position detecting sensor  34  can be constructed, for example, by arranging in the Z direction a plurality of two-dimensional position detecting sensors  24  one of which is shown in  FIG. 2A  in a plurality of layers.  
      Incidentally, the Z direction in the stereoscopic two-dimensional image can be represented by a method of representing the sense of depth by incorporating a projection method in the stereoscopic image.  
      The display driving unit  6  controls the driving of the display section  1  according to the image transmitted from the control unit  10 . Concretely, the display driving unit  6  receives through the control unit  10  the image data created by the image creating unit  9 , and causes the image corresponding to the image data to be displayed on the image display plane  1 A of the display section  1 .  
      The audio driving unit  8  controls the driving of the audio output section (speaker)  5  and causes the audio output section  5  to produce predetermined voice according to an instruction from the control unit  10 .  
      The sensor driving/controlling unit  7  drives the position detecting sensor  4  and receives the detected signal indicative of a detected position from the position detecting sensor  4 . The detected signal thus received is sent to the control unit  10 . If the detected signal received through the sensor driving/controlling unit  7  is a predetermined detected signal, the control unit  10  instructs the image creating unit  9  to create an image, causes display driving unit  6  to display the created image on the image display plane  1 A and causes the audio outputting section  5  to produce the voice corresponding to the created image.  
      The image creating unit  9 , which creates the image data to be created on the display section  1 , is adapted to create the image according to a prescribed program for example. The image creating unit  9  previously records predetermined image or picture and so may be adapted to supply the recorded image or picture to the control unit  10  according to an instruction from the control unit  10 .  
      The control unit  10  receives the signal produced from the position detecting sensor  4  through the sensor driving unit  7 , and when having received a predetermined detected signal from the position detecting sensor  4 , displays the image corresponding to the detected signal in exchange for the image displayed until now. Specifically, the control unit  10  controls the display section  1  to change the displayed image according to the output signal from the position detecting sensor  4 , thereby changing the two-dimensional image to be imaged on the special stereoscopic image display plane  2 .  
      The stereoscopic two-dimensional display device M according to this embodiment constructed as described above may be not employed as only a stereoscopic two-dimensional image display device, but employed as an adaptive display device capable of changing the displayed stereoscopic image adaptively according to a user&#39;s action.  
      Referring to various examples, an explanation will be given of the contents of control executed actually. Now, assuming that the stereoscopic two-dimensional image display device M according to this embodiment is installed as a display for exhibition, changes in the image generated by a user&#39;s action will be explained.  
     EXAMPLE 1  
      Example 1 is directed to a case where the display device M is employed as a touchless controller (which controls the display of a stereoscopic image by a touching operation with no actual sense of touching). In this case, as shown in  FIG. 3 , a pot (object) image  110  is previously displayed spurious-stereoscopically on the stereoscopic image display plane  2 . A viewer H can feel the sense of apparently touching the stereoscopic image of the pot by extending his hand toward the stereoscopic image display plane  2 .  
      In this example, in such a displayed state, as shown in  FIG. 1 , for example, the viewer H inserts his hand  50  (may be replaced by a rod) in a detected area (stereoscopic image display plane  2  or a plane in the vicinity thereof) of the position detecting sensor  4  and moves the hand. Then, the image  110  changes according to the position or movement of the hand  50 .  
      As a change according to the position or movement of the hand  50 , for example, when the position detecting sensor  4  detects that the viewer H has moved his hand  50  from left to right, the control unit  10  displays the image illustrating that the pot has rotated from left to right on the image display plane  1 A. Then, the pot which is the stereoscopic two-dimensional image displayed on the stereoscopic image display plane  2  changes from left to right. In this way, when the stereoscopic image changes according to the position or movement of the hand  50 , the viewer H can feel as if the pot was rotated by the rotation by himself. Namely, the viewer H can acquire the sense that he is actually moving the stereoscopic image by the position or movement of the hand  50 .  
      In this case, actually, although the two-dimensional image displayed only changes, since the image which appears stereoscopically changes, the image can be seen as if the real pot was rotating. Namely, the user interface in which the viewer H can directly participate in the displayed image is constructed by the position detecting sensor  4 . Thus, the viewer H can enjoy the image changed in a passive attitude, thereby increasing amusement. Incidentally, the combination of physical approaching by the viewer H for the detected area and image changes can be optionally set by predetermination. Accordingly, the user interface by intuitive or gestural action such as space tracing or touching can be realized. Further, in place of the hand  50 , a globe which operates in cooperation with the control unit  10  may be employed. In this case, if forth feedback such as restitution or electric stimulus is realized in order to acquire for the viewer the sense having touched the displayed pot by the globe, the user interface with greater reality can be realized.  
      If a three-dimensional position detecting sensor is employed as the position detecting sensor  4 , since the position in a depth direction of a hand or finger can also be detected, the stereoscopic image displayed can be changed more complicatedly according to the three-dimensional position or movement of the hand or finger.  
      Further, with a click button (mark)  112  displayed on the stereoscopic image display plane  2  as shown in  FIG. 3 , by moving the finger to the displayed position of the click button  112  or its vicinity, the image can be changed. For example, by displaying the image illustrating that the cover of the pot has opened by the operation of pushing the click button  112 , it is possible to cause the viewer H to feel as if the cover of the pot has opened by the button operation by the viewer H.  
      In this way, by displaying the click button  112  (mark), the display device according to this embodiment can be used like a “touch panel display”. In addition, in this case, since the thing corresponding to the touch panel is not present, the viewer H can change the image or screen with a strange sense that he visually touches the thing but actually does not touch anything. In this way, since the viewer does not touch anything, the display device according to this embodiment can be used in a scene where the viewer cannot touch a real button from the viewpoint of sanitation, for example, in a medical scene.  
      Further, not only the image is changed according to the operation of the viewer H, but also in combination therewith, the voice can be produced from the audio output section  5 . For example, by producing the sound corresponding to the operating status (click sound, drugging sound, NG sound, etc.), the sense of reality or amusement can be enhanced.  
      Further, by displaying the guide mark such as a circle, cursor, icon, etc. serving as an operating guide at the spot where the viewer H has moved his finger  51 , the viewer H can easily recognize his directed position. In this case, if the guide mark is displayed to have any meaning, by carrying out the operation according to this display, the viewer can easily change the image or screen.  
     EXAMPLE 2  
      Example 2 is directed to a case where the display device M is employed as a plotting means. In this case, as shown in  FIG. 4 , when the finger  51  or rod is detected at a certain position within the detected area by the position detecting sensor  4 , the control unit  10  displays a point at the position on the stereoscopic image display plane  2  corresponding to the detected position. When the finger  51  or rod continuously moves within the detected area, according to its movement, the points are continuously plotted at the positions on the stereoscopic image display plane  2  corresponding to the detected positions, thereby plotting a line. Now, with a color pallet being displayed simultaneously on the stereoscopic image display plane  2 , when a certain color on the color pallet is selected, the color may be changed or the color in subsequent plotting may be changed selectively. Further, with an eraser tool, contrary to plotting, the image at the detected position may be erased. Further, if the position of a fingertip is caused to glitter or blink, a strong impression in changes on the stereoscopic image display plane  2  can be given to the viewer H, thereby further dressing amusement.  
      Where the three-dimensional position detecting sensor is employed as the position detecting sensor  4 , the three-dimensional position in the height, width and depth of the tip of the finger or rod can be detected. For this reason, the control unit  10  can compute the position on the displayed image using the projection method on the basis of three items of position information of the height, width and depth to plot the three-dimensional image spuriously and display it.  
      In this way, the operation of e.g. plotting a picture by a personal computer using a mouse can be carried out for a spatial virtual canvas. Further, in the case of the display device, since a stereoscopic image can be simultaneously displayed on the stereoscopic image display plane  2 , the picture superposed on a semi-transparent image, stereoscopic image or real thing can be easily plotted.  
     EXAMPLE 3  
      As shown in  FIG. 5 , Example 3 is directed to a case where the control unit  10  displays a lamp  132  and a stereoscopic object  130  on the stereoscopic image display plane  2  so that how the shade  130   a  of the stereoscopic object  130  changes according to changes in the position of the lamp  132  displayed can be observed as a stereoscopic image.  
      In this example, with a large number of images each composed of the image position of the lamp  132  and that of the shade  130   a  of the stereoscopic object  130  being prepared previously, the image position of the lamp  132  is moved according to the movement of the position of the viewer&#39;s hand  50  and the image of the shade of the stereoscopic object  130  is moved according to the movement of the image position of the lamp  132 , thereby making the display of changing the position of the shade. This changing is completely carried out through exchange of the images. By displaying such a change continuously, how the shade is created according to the change in the position of the lamp  132  can be easily observed.  
      In the example shown in  FIG. 5 , the position of the lamp  132  is moved. However, as shown in  FIG. 6 , with an image consisting of a plurality of lamps  132  arranged previously being displayed, by ON/OFF switching of each lamp  132 , how the shade  130   a  of the stereoscopic object  130  is created can be changed. Further, in this embodiment, with a switch  40  having three buttons  41  to  43  corresponding to the lamps  132  being provided as the position detecting sensor  4 , when either one of buttons  41  to  43  is depressed, the image of the lamp  132  at the position of the depressed button is turned ON. In short, there are the image of the stereoscopic object  130  and three images of the lamps  132  illuminating the object  130  (the image of each lamp includes two kinds of OFF image and ON image). By the operation of the switch  40 , the image is changed. When either one of the buttons  41  to  43  of the switch  40  is depressed, the image of the lamp  132  corresponding to the depressed button  41  to  43  turns ON so that the shade  130   a  of the stereoscopic object changes according to the position of the lamp  132  turned ON. Incidentally, the colors of the lamps  132  may be discriminated in plurality.  
      In this way, by changing the image according to the viewer&#39;s intention, the viewer H can acquire the sense as if there was not the image but a real thing.  
      The means employed when the viewer H gives the operating signal may be, in addition to the hand or finger, globes  301 , chopsticks  302  and a pen  303  as shown in FIGS.  7  to  9 , and further may be a mouse, manipulator, magic hand, etc.  
       FIG. 10  is a view showing a schematic configuration of a stereoscopic two-dimensional image display device M 2  according to another embodiment of this invention. This display device M 2  includes, in addition to the configuration of the display device M shown in  FIG. 1 , a light-transmissive shielding member (transparent glass or acryl plate)  12  arranged between the micro-lens array  3  and the stereoscopic image display plane  2 .  
      If the light-transmissive shielding member  12  is arranged in this way, without hindering the image display, the micro-lens array  3  and the display section  1  at the inner part thereof can be protected. Specifically, in the case of such a display device M 2 , the viewer is probably urged to extend his hand to the stereoscopic image displayed on the stereoscopic image display plane  2 . In an extreme case, the hand or thing may be inserted to the position reaching the micro-lens array  3 . This display device M 2 , which is provided with the shielding member  12  in front of the micro-lens array  3 , can protect the micro-lens array  3  and others.  
      Incidentally, there is a proposal in which when the position detecting sensor  4  detects that the hand or thing has been inserted in the inner part of the enclosure  20 , NG sound is generated in response to this detection. This proposal can give an effect of calling a viewer&#39;s attention to a certain degree. In this case, although the shielding member  12  is not required, its presence assures the safety of the device more highly. Further, the guide of the position detected by the position detecting sensor can be given by a technique of setting a frame or plotting a line in the vicinity of the position, or installing a laser light source around the enclosure so that the finger  51  the viewer H points is illuminated by the laser light which is projected e.g. in a matrix shape.  
      The stereoscopic two-dimensional image display device M, M 2  may be installed diagonally at the viewer&#39;s looking-down position so as to attain a visual recognition property and a usability, in case of using it as the display for an exhibition.  
       FIGS. 11A and 11B  show examples of installing the stereoscopic two-dimensional image display device M. In  FIGS. 11A and 11B , reference numeral  200  denotes a setting stand which is located at a slightly lower position than the viewer. The display device M with the front oriented skew-upward is installed on the stand. In this way, since the display device M is installed at the viewer&#39;s looking-down position, it is easy to see for the man or woman at different heights. Further, the distance from the viewer&#39;s viewing point to the stereoscopic two-dimensional image can be made different over the displaying range of the stereoscopic two-dimensional image. Thus, focus can be easily achieved at a portion of the stereoscopic two-dimensional image as compared with the case where the distance from the viewing point to the stereoscopic two-dimensional image is constant, e.g. the viewing point and the stereoscopic two-dimensional image are located at the same height. This facilitates visual recognition of the entire stereoscopic two-dimensional image. Additionally, a chair may be prepared in the vicinity of the stereoscopic two-dimensional image display device M. At the upper and lower positions of the front of the enclosure  20  of the display device M, M 2 , bars  201  and  202  are provided. The viewer can hold the bar  201 ,  202 , put his hand thereon or rest his body against the bar. The surface of the bar  201 ,  202  may be covered with a soft and hard-to-soil material which can be replaced as required. Incidentally, the bars may be provided not only horizontally at the upper and lower positions but also vertically at the left and right positions of the front of the display device.  
      As explained hitherto, the stereoscopic two-dimensional image display device M according to this embodiment includes a display section  1  with an image display plane  1 A on which a two-dimensional image is displayed, a micro-lens array  3  for spurious-stereoscopically displaying the two-dimensional image on a stereoscopic image display plane  2  by imaging light emitted from the image display plane  1 A onto the stereoscopic image display plane  2  apart from the image display plane  1 A, a position detecting sensor  4  arranged to correspond to the stereoscopic image display plane  2 , for producing an output signal corresponding to a position subjected to outside physical approaching, and a control unit  10  for changing the image within the stereoscopic image display plane  2  according to the output signal from the position detecting sensor  4 .  
      In accordance with this embodiment, the position detecting senor  4  is arranged to correspond to the stereoscopic image display plane  2  on which a spurious-stereoscopic image is displayed, and the displayed image is changed according to the output signal from the position detecting sensor  4  when the outside physical approaching is received. For this reason, when a viewer takes the physical approaching for the displayed image (concretely, extending or moving a hand or finger), changes in the image reflecting the viewer&#39;s intension can be made. Namely, the user interface in which the viewer can directly participate in the displayed image is constructed by the position detecting sensor. Thus, the viewer H can enjoy the image changed in a passive attitude, thereby enhancing amusement.  
      In the stereoscopic two-dimensional image display device M according to this embodiment, the position detecting sensor  4  is a two-dimensional position detecting sensor  24  for detecting the position of an object which traverses the stereoscopic image display plane  2  or a plane in the vicinity thereof, and the control unit  10  changes the image within the stereoscopic image display plane  2  on the basis of the detected signal from the two-dimensional position detecting sensor  24 .  
      In accordance with this embodiment, since the two-dimensional position detecting sensor  24  is used as the position detecting sensor  4 , a viewer can enjoy image changes according to the position or movement of his hand or finger by extending the hand or finger to the detected area of the position detecting sensor  4  and further moving it in this state. For example, since the two-dimensional image displayed on the stereoscopic image display plane  2  is seen as a spurious-stereoscopic image for the viewer, the viewer can feel the sense of touching the stereoscopic image when having extended his hand to it. In accordance with this embodiment, further, at this time, the stereoscopic image displayed can be changed according to the position or movement of the hand. Thus, the object that is seen as the stereoscopic image can be shown as if the object actually moved according to the viewer&#39;s own hand or finger.  
      In the stereoscopic two-dimensional image display device M according to this embodiment, the position detecting sensor  4  is the three-dimensional position detecting sensor  34  which detects the position of the object inserted in the space including the stereoscopic image display plane  2 , and the control unit  10  changes the image within the stereoscopic image display plane  2  on the basis of the detected signal from the three-dimensional position detecting sensor  34 .  
      In accordance with this embodiment, since the three-dimensional position detecting sensor  34  is used as the position detecting sensor  4 , a viewer can enjoy image changes according to the position or movement of his hand or finger by extending the hand or finger to the detected area of the position detecting sensor  4  and further moving it in this state. Particularly, since the three-dimensional position detecting sensor  34  also detects the position in a depth direction, the viewer can enjoy the image change according to the position or movement of the hand or finger in the depth direction. For example, since the two-dimensional image displayed on the stereoscopic image display plane  2  is seen as a spurious-stereoscopic image for the viewer, the viewer can feel the sense of touching the stereoscopic image when having extended his hand to it. In accordance with this invention, further, at this time, the stereoscopic image displayed can be changed according to the position or movement of the hand. Thus, the object that is seen as the stereoscopic image can be shown as if the object actually moved according to the viewer&#39;s own hand.  
      The stereoscopic two-dimensional image display device M according to this embodiment includes the audio output section  5  for outputting voice, and the control unit  10  produces the voice from the audio output section  5  on the basis of the output signal from the position detecting sensor  4 .  
      In accordance with this embodiment, since the voice is outputted from the audio output section  5  on the basis of the output signal from the position detecting sensor  4 , amusement can be further enhanced by outputting the voice corresponding to the image change.  
      The stereoscopic two-dimensional image display device M according to this embodiment is characterized in that the display section  1  and micro-lens array  3  display a prescribed mark within the stereoscopic image display plane  2  and the control unit  10  changes the image when the position detecting sensor  4  produces an output signal in the area corresponding to the mark.  
      In accordance with this embodiment, with the prescribed mark or image displayed within the stereoscopic image display plane  2 , the image is changed when any physical approaching is taken for the area corresponding to the mark. For this reason, by displaying e.g. a button as the mark, the display device according to this embodiment can be used like a “touch panel display”. In addition, in this case, since the thing corresponding to the touch panel is not present, the viewer H can change the image with a strange sense that he visually touches a thing but actually does not touch anything.  
      The stereoscopic two-dimensional image display device M according to this embodiment is characterized in that the control unit  10  displays the image according to the detected position detected by the position detecting sensor  4 .  
      In accordance with this embodiment, since the image is displayed according to the detected position detected by the position detecting sensor, the operation of e.g. plotting a picture by a personal computer using a mouse can be carried out for a spatial virtual canvas. In this case, the picture superposed on a semi-transparent image or stereoscopic image can be easily plotted.  
      The stereoscopic two-dimensional image display device M according to this embodiment is characterized by the light-transmissive shielding member  12  arranged between the micro-lens array  3  and the display plane  2 .  
      In accordance with this embodiment, since the light-transmissive shielding member  12  is arranged between the micro-lens  3  and the stereoscopic image display plane  2 , without hindering the image display, the micro-lens array  3  and the display section  1  at the inner part thereof can be protected against approaching of an object from the outside. Specifically, in the case of such a display device M, the viewer is probably urged to extend his hand to the stereoscopic image. In an extreme case, the hand or thing may be inserted to the position reaching the micro-lens array  3 . This display device, which is provided with the shielding member  12  in front of the micro-lens array  3 , can protect the micro-lens  3  and others by this shielding member  12 .  
      Incidentally, it is not necessary that the display section  1 , stereoscopic image display plane  2 , micro-lens array  3  and stereoscopic two-dimensional image display device M are located in parallel.  
      In the description made hitherto, the micro-lens array  3  was a micro-convex lens plate in which a set of two lens array halves  3 A are integrated. Without being limited to such a lens plate, it may be a single lens array half  3 A. However, in such a case, since the two-dimensional image displayed on the image display plane  1 A of the display section  1  is inversion-displayed on the stereoscopic image display plane  2 , the control device  10  or display driving unit  6  may display the two-dimensional image with the video signal inverted previously on the image display plane  1 A of the display section  1 .  
      Additionally, if the micro-convex lens  3 C is allotted to each of the display pixels formed on the image display plane  1 A, the two-dimensional image is not inversion-displayed so that the arrangement of only the single lens half  3 A gives rise to no problem.