JPH0898219A - Stereoscopic picture display device - Google Patents

Abstract

PURPOSE: To use a high-luminance lamp as the light source to display a bright stereoscopic picture by providing a backlight device with the means which follows the position of displayed observer's face to illuminate a space modulation element. CONSTITUTION: The video signal of the front face of an observer 16 photographed by a camera 14 of a photographing device is displayed on observer image display means 12a and 12b of the backlight device. This displayed face image is followed by a light source 80, which emits light only in right and left half faces, and is taken as backlight for right eye and left eye of stereoscopic picture display. By this constitution, the high-luminance lamp is used as the light source 80, which illuminates space modulation elements 10a and 10b from back, to display a bright stereoscopic picture. Since only one photographing device consisting of an infrared lamp 13, the camera 14, etc., is used, the device is miniaturized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic image display device used for industrial, household or medical purposes.

[0002]

2. Description of the Related Art As a conventional stereoscopic image display device, an observer wears spectacles having a function of distributing left and right to display stereo images for the right eye and the left eye which are time-divisionally displayed on an image display surface. Those that can be observed only by the right and left eyes of the observer, respectively, or a lenticular plate is attached to the image display surface, the image distribution function of the lenticular plate, a stereo image for the right eye and the left eye It is general that the above can be observed only by the right and left eyes of the observer.

FIG. 13 shows a configuration of an example of the conventional stereoscopic image display device. Reference numeral 60 is spectacles having a left / right distribution function, 61a and 61b are liquid crystal shutters, and 62 is a liquid crystal shutter.
Is a synchronizing circuit, and 63 is a color CRT as an image display device. The operation of the stereoscopic image display device according to the first example of the related art configured as described above will be described. Color CRT 63
, The stereo images for the right eye and the left eye are alternately displayed in a time division manner. The liquid crystal shutter 61a of the eyeglasses 60 is opened and is in a transmissive state only when a right-eye stereo image is displayed, and the liquid crystal shutter 61b is opened and is in a transmissive state only when a left-eye stereo image is displayed. By controlling the open / closed state by the synchronization circuit 62, the observer wearing the eyeglasses 60 observes only the stereo image for the right eye with the right eye and only the stereo image for the left eye with the left eye. This allows stereoscopic viewing.

FIG. 14 shows a structure of a stereoscopic image display device according to a second conventional example. Reference numeral 71 is a lenticular plate in which a large number of cylindrical lenses are formed in stripes, and 72 is a color CRT as an image display device. is there. The operation of the conventional second example stereoscopic image display device configured as described above will be described. On the color CRT 72, stereo images for the right eye and the left eye are simultaneously displayed alternately in a slit shape having a width that is approximately half the stripe width of the lenticular plate 71. The right eye of the observer is the lenticular plate 7.
Only the stereo image for the right eye displayed in the slit shape is observed through each of the cylindrical lenses 1 and the left eye similarly observes only the stereo image for the left eye displayed in the slit shape. This allows stereoscopic viewing.

[0005]

However, according to the study by the present inventors, in the stereoscopic image display device in the first conventional example as described above, the stereo image is independent of the right and left eyes of the observer. Since eyeglasses having a left / right distribution function are indispensable for observing images, the observer feels annoyance, and the stereo image to be displayed needs to be switched between the right eye image and the left eye image in time division. Therefore, there is a problem that flicker occurs in an image, which becomes an obstacle in observing a stereoscopic image.

Further, in the stereoscopic image display device of the second conventional example, since the stereoscopic image is observed through the stripe-shaped lens, the spatial tolerance of the stereoscopically visible observer is narrow and the observer moves. In this case, the image is deteriorated, and it is difficult for a large number of people to observe it at an arbitrary position, and it is necessary to perform image processing for displaying the image in stripes. It had a problem of becoming expensive.

Further, in the medical field, when an endoscopic operation is performed, the operation is usually performed by an operator observing a plane image of the patient's abdominal cavity projected by the endoscope on a monitor. However, the monitor image in the abdominal cavity has few features because the entire abdominal cavity has a single color, and it becomes difficult to confirm the perspective of the affected area, which tends to lengthen the operation time and burden the patient and the operator. Was also great. On the other hand, when the first and second stereoscopic image display devices of the related art are used, the left and right spectacles, the flickering of the image, the annoyance due to the limitation of the movement of the observer, and the like prevent the practical use. is the current situation.

In view of the above-mentioned drawbacks of the prior art, the present inventors photographed an observer with a photographing device, and illuminate the display on a display device corresponding to the photographed observer from the backside with a spatial modulation element. Therefore, we proposed a stereoscopic image display device that does not require glasses having a function of sorting left and right, allows a large number of people to stereoscopically view at the same time without depending on the position of an observer, and has a flicker-free screen.

However, in the display on the display device corresponding to the observer, even if the display has the highest luminance, the luminance is lowered by the passage of the lens, the spatial modulation element, etc., and depending on the photographing conditions of the observer, the display may be different. I can't get enough brightness,
Further, the brightness is reduced. INDUSTRIAL APPLICABILITY The present invention does not require glasses having a function of distributing left and right, allows a large number of people to stereoscopically view at the same time without depending on the position of an observer, and has a flicker-free screen and illuminates a spatial modulation element from the back surface. An object of the present invention is to provide a stereoscopic image display device capable of displaying a bright stereoscopic image by using a lamp with high brightness as a light source.

[0010]

In order to solve this problem, a stereoscopic image display device of the present invention is a display object in a stereoscopic image display device for observing different images in the left and right eyes of an observer. A spatial modulation element having a light-transmitting element for displaying a stereoscopic image, a backlight device for illuminating the spatial modulation element from the back surface, and an optical element having directivity for enlarging the display surface of the backlight device. The backlight device includes an element, a display unit that displays a figure corresponding to the position of the face of the observer, and the position of the figure displayed on the display unit, and corresponds to the left face and the right face. Lighting means for illuminating the spatial modulation element with light having a higher luminance than the display means.

Here, each of the spatial modulator and the backlight device is provided two by two, and a stereoscopic image for the right eye and a stereoscopic image for the left eye are displayed on each of them, and the displayed stereoscopic images are combined by the combining means. Also, the spatial modulator is for the right eye,
The stereoscopic image for the left eye is alternately displayed in a time division manner, and the light emitting display device pulsates to the time division display of the spatial modulation element to switch the image display in a time division manner. Further, the stereoscopic image display device further has a photographing means for photographing the observer, and the display means displays the face image of the observer photographed by the photographing means as a figure.

[0012]

With this structure, the backlight device is
Display means for displaying an observer photographed by the photographing device and the face position of the observer displayed on the display means are followed, and light having higher brightness than the display means from positions corresponding to the left face and the right face. With the configuration including the illuminating means for illuminating the spatial modulation element, it becomes possible to display a bright stereoscopic image by using a lamp with high brightness as a light source by adding a simple structure.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below. Prior to this description, some examples included in the prior application of the same applicant will be cited and described as reference examples. Reference Example 1 In the reference example of FIG. 1, 10a and 10b are transmissive liquid crystal displays as spatial modulators.
Reference numerals a and 11b are Fresnel lenses having a focal length of 150 mm as directional optical element lenses located on the back surfaces of the spatial modulation elements 10a and 10b, respectively. 12a, 12
b is a black and white CR as an observer image display device having a light emitting function.
T, which are located on the opposite sides of the spatial modulation elements 10a and 10b with the lenses 11a and 11b sandwiched therebetween.
Lenses 11a, 11 farther than the focal lengths of a, 11b
It is installed at a position 160 mm away from b. 13a, 13
b is an illuminating device and has wavelengths of 850 nm and 950, respectively.
nm LED light, 14a and 14b are black and white CCD cameras as photographing devices, and 15 are spatial modulation elements 10a and 10b.
Half mirrors 16 and 17 for synthesizing the images displayed in 1 are shown as observers for observing stereoscopic images. FIG. 2 shows that the LEDs 13a and 13b
The figure shows a state in which the observers 16 and 17 are illuminated from the front, and 20a and 20b indicate areas illuminated by the light from the LEDs 13a and 13b, respectively.

FIG. 3 shows the emission wavelength characteristics of the LEDs 13a and 13b.
5b shows the wavelength distribution of the LED 13b, and 26a, 2
Reference numeral 6b indicates a region selectively transmitted by the wavelength filters mounted on the black and white CCD cameras 14a and 14b, respectively. FIG. 4 is a sectional view of the black and white CCD cameras 14a and 14b, 30 is an image pickup lens, 31a and 31b are interference filters as wavelength filters, 32 is an image pickup device containing a CCD chip, and 33 is a drive circuit for the image pickup device. , 34 denote subjects.

FIG. 5 shows how the observer observes his / her own facial image as a virtual image in the reference example shown in FIG. 1. For the sake of clarity, the observer image display device (black and white C
RT) and a lens are shown one by one, and a half mirror, a liquid crystal display, another lens and an observer image display device are omitted. 11a is a lens, 12a
Is a black and white CRT, 16 and 17 are two observers observing stereoscopic images, and 40, 41, 42 and 43 are black and white CRTs 1.
The area actually observed by the observer in the observer image displayed on the screen 2a is shown.

The operation of the stereoscopic image display device configured as described above will be described with reference to FIGS. The stereo images observed by the observers 16 and 17 in FIG. 1 are the liquid crystal display 10b in which the right-eye image is displayed on the liquid crystal display 10a and the left-eye image is a left-right inverted mirror image.
, And the two stereo images are combined into one screen by the half mirror 15.
More specifically, in FIG. 1, for example, CR
The image on the right side of T12a (actually the right face) corresponds to the right face of the observer 17, and the liquid crystal display 10a is driven by an image for viewing with the right eye. Similarly, an image of the left face of the observer 17 is also displayed on the CRT 12b as a backlight, and the liquid crystal display 10b is driven by an image for viewing with the left eye. Since these two images are combined by the half mirror, they appear as a stereoscopic image to the observer. Also, C
The image on the left side of the RT 12a (actually the right face) and the observer 16
The right side face corresponds to, and the liquid crystal display 10a is driven by an image for viewing with the right eye. Similarly CRT12b
Also, the image of the left face of the observer 16 is displayed as a backlight, the liquid crystal display 10b is driven by an image for viewing with the left eye, and the two images are combined by the half mirror. You can observe stereoscopic images.

As shown in FIG. 2, the LEDs 13a and 13b arranged on both sides of the front of the observers 16 and 17 are, as shown in FIG. Observer 16
And 17 so as to illuminate the left half area 20b of the face. The emission wavelengths of the LEDs 13a and 13b are 850 nm and 950 n, respectively, as shown in FIG.
Since it has distributions 25a and 25b centered on m, and the light intensities in the overlapping regions are both half values or less, they can be used as two different wavelength light sources.
On the other hand, in the CCD cameras 14a and 14b, as shown in FIG. 4, interference filters 31a and 31b having transmission characteristics of wavelengths 850 ± 20 nm and 950 ± 20 nm are inserted between the image pickup device 32 and the image pickup lens 30, respectively. Therefore, when the subject 34 forms an image on the image sensor 32, only the portions illuminated by the wavelength regions 26a and 26b in FIG. 3 remain as an image. Therefore, according to the configuration described above, CC
The D camera 14a photographs only the area 20a in FIG. 2 and displays it on the monochrome CRT 12a, and the CCD camera 14b.
Is a black and white CRT by shooting only the area 20b in FIG.
12b can be displayed. Black and white CRT 12a,
The images of the observers 16 and 17 taken by the CCD cameras 14a and 14b are vertically inverted and displayed on the screen 12b. At this time, the face areas 20a and 20b are displayed in white and high brightness so that the black and white CRTs 12a and 12b are displayed. The brightness and contrast, and the lens diaphragms of the CCD cameras 14a and 14b are adjusted.

Next, the operation of the Fresnel lenses 11a and 11b will be described with reference to FIG. Fresnel lens 11
a is installed so that the observer images displayed on the black and white CRT 12a can be observed by the observers 16 and 17 as virtual images.
By setting the distance from the black-and-white CRT 12a outside the focal length of the Fresnel lens 11a, the right and left eyes of the observer 16 are provided with the areas 4 on the screen of the black-and-white CRT 12a.
0 and 41 only, and black and white C for the right and left eyes of the observer 17
Only the regions 42 and 43 on the screen of the RT 12a can be independently observed and can be enlarged and observed with the effective diameter of the Fresnel lens 11a as a limit. Therefore, when the regions 40 and 42 are light emitting surfaces, the observer 16,
It is possible for 17 to act as an illumination having selectivity to the right eye of a size corresponding to the effective diameter of the Fresnel lens 11a. At this time, since the regions 41 and 43 do not emit light,
The light from the monochrome CRT 12a does not enter the left eye. The operation of the Fresnel lens 11a described above is the same for the Fresnel lens 11b, and the light from the monochrome CRT 12b enters only the left eye.

Therefore, the monochrome CRT as described above
The observers 16 and 17 in FIG.
The right half surface region 20a of the face of the
By making it correspond to the region of FIG. 5, the observers 16 and 17 observe a bright virtual image only in the right eye, and make the left half surface region 20b in FIG. 2 displayed on the monochrome CRT 12b correspond to the regions 41 and 43 in FIG. As a result, the observers 16 and 17 will observe a bright virtual image only in the left eye.
However, since the image displayed on the monochrome CRT 12b is observed through the half mirror 15 as shown in FIG.

By the operation of the present apparatus described above, the stereo image for the right eye displayed on the liquid crystal display 10a in FIG. 1 can be observed by being illuminated from the back surface only for the right eyes of the observers 16 and 17, and the liquid crystal can be observed. The stereo image for the left eye displayed on the display 10b is the observer 1
Since only the left eyes of 6 and 17 are illuminated from the back side for observation, the observers 16 and 17 can observe a pair of stereo images at the same time, and stereoscopic vision is possible. Even if the observers 16 and 17 move, the LE shown in FIG.
As long as the illumination condition of D is maintained, stereoscopic viewing is possible.

In the above reference example, a transmissive liquid crystal display was used as the spatial modulation element, but the spatial modulation element may be any one that has optical transparency and can display a stereo image. It may be a recorded film. Further, the LED used as the light may be one that can emit two different wavelengths in the infrared wavelength region, and may be, for example, a halogen lamp equipped with a wavelength filter to limit the emission wavelength band.

Reference Example 2 FIG. 6 shows the configuration of a stereoscopic image display device according to Reference Example 2 of the present invention.
a and 10b are transmissive liquid crystal displays as spatial modulation elements, and 11a and 11b are focal lengths of 150 m as lenses located on the back surface of the spatial modulation elements 10a and 10b, respectively.
m Fresnel lens. Reference numerals 12a and 12b are black and white CRTs as observer image display devices having a light emitting function, and the spatial modulation element 10 is sandwiched between the lenses 11a and 11b.
It is located on the opposite side to a and 10b, and is installed at a distance of 160 mm from the lenses 11a and 11b. 13a and 13b are illuminators having LEs with wavelengths of 850 nm and 950 nm, respectively.
D light, 14a, 14b are black and white CCD as a photographing device
The camera, 15 is a half mirror for combining the images displayed on the spatial modulation elements 10a, 10b into one, 16, 1
Reference numeral 7 denotes an observer who observes a stereoscopic image, and 18 denotes a difference processing device.

Since the operation of the stereoscopic image display device configured as described above is basically the same as that of the first embodiment shown in FIG. 1, the same parts are designated by the same reference numerals and the description thereof will be omitted. Only different points will be described. The video signals of the facial images of the observers 16 and 17 which are separately captured by the cameras 14a and 14b are input to the difference processing device 18 and are subtracted from each other, and then output to the black and white CRTs 12a and 12b, respectively. Since the common part in the two images is canceled by the difference processing described above, it is possible to remove the image necessary for the configuration of the stereoscopic image display device such as the background of the observers 16 and 17.

(Embodiment 1) FIG. 7 is a block diagram of a stereoscopic image display apparatus in this embodiment. 10a and 10b are transmissive type influence displays as spatial modulators, and 11a and 11b.
Reference numeral b is a Fresnel lens having a focal length of 150 mm as a lens located on the back surface of each of the spatial modulation elements 10a and 10b. Reference numerals 12a and 12b denote black and white CRTs as observer image display devices having a light emitting function, and lenses 11a and 11b.
They are located on the opposite sides of the spatial modulators 10a and 10b, respectively, with a distance of 160 mm from the lenses 11a and 11b. 13 is an illuminating device having a wavelength of 850 nm LE
D light, 14 is a monochrome CCD camera as a photographing device, 1
Reference numeral 5 is a half mirror for combining the images displayed on the spatial modulation elements 10a and 10b into one, 16 is an observer for observing a stereoscopic image, and 80 is a light source, which extends in the lateral direction on the display screen, for example. It is located at the intersection of the axis 82 and the axis 81 extending in the longitudinal direction.

The characteristic part of the operation of the stereoscopic image display device constructed as described above will be explained. The image signal of the face from the front of the observer 16 captured by the camera 14 is a black and white C image.
The light sources 80 displayed on the RTs 12a and 12b, which follow the displayed face image and emit light only on the left and right half surfaces serve as backlights for the right eye and the left eye of the stereoscopic image display. In this case, one light 13 and one camera 14 are enough.

FIG. 8 is a diagram showing an example of the configuration of the backlight device in this embodiment. Note that FIG. 8 shows a light source for the right eye, and a light source for the left eye is not shown. 12 in the figure
Reference numeral a denotes the observer image display device shown in the above reference example. The observer image display device 12 a displays the observer imaged by the camera 14. On the front surface of the display screen of the observer image display device 12a, a light source 80 including a high-intensity lamp such as an LED is provided.
Are placed. The light source 80 is located, for example, at the intersection of a horizontally extending axis 82 and a vertically extending axis 81 on the display screen, and along the axes 81 and 82, the observer image display device 12a.
Move following the observer image on the display screen. There are various techniques for moving the light source 80 along the shafts 81 and 82, but in this example, a male screw is cut on the shafts 81 and 82 and screwed with a female screw of the light source 80 to form a shaft. It is configured to move by the rotation of 81 and 82. The light source 80 has a structure in which the left half 80a shines toward the surface and the right half 80b does not shine. This corresponds to the upside down image of the right face of the observer shown in the above reference example. Therefore, as the light source for the left eye, a light source having a structure in which the right half shines toward the surface and the left half does not shine is used.

The tracking of the observer image on the display screen of the observer image display device 12a is performed by the following two procedures. First,
The movement of the observer image on the display screen of the observer image display device 12a is detected. As shown in FIG. 9, for example, an intersection tracking sensor 83 in which an optical sensor is arranged as shown in FIG. 10A is coupled to the display device 12a side of the light source 80. The movements of the light spots on the display screen in the eight directions shown in FIG. 10B are detected by the respective optical sensors shown in FIG.

Next, the light source 80 moves in the horizontal and vertical directions on the axes 80 and 81 in accordance with the detection direction of the movement of the light spot on the display screen to trace the light spot. Hereinafter, the control procedure of the light spot tracking of the present embodiment will be described with reference to the flowchart of FIG. In step S10, the display screen of the observer image display device 12a is scanned from left to right and from top to bottom as an initial operation of the apparatus, and a light spot is searched for in step S20. When the light spot is found, the initial amount of received light is measured in step S25, the process proceeds to step S30, the movement of the light spot is sensed, and if there is no movement, the position is maintained. Here, the presence / absence of movement is determined to be movement when, for example, one of the nine sensors shown in FIG. 10A has a light receiving amount below a predetermined level. In order to more stably determine the presence or absence of movement, the number of sensors may be increased and determination may be made based on changes in a plurality of sensors.

If there is a movement of the light spot corresponding to the movement of the observer, the process proceeds to step S40 and the moving direction is detected.
For detection of the direction, for example, the opposite direction of the light receiving amount of the nine sensors shown in (a) of FIG. 10 is set as the moving direction of the light spot (see (b) of FIG. 10). When the moving direction is determined, the light source 80 is moved by one step in the moving direction determined in step S50. Here, one step may be half the distance from the central sensor shown in FIG. 10A to the sensor in each direction. In addition, in step S50, if the movement is performed by providing two steps of the normal movement step and the fine movement step, the movement can be performed more accurately.

In step S60, for example, if all of the nine sensors 90 shown in FIG. 10 (a) are in the original state of receiving light, the process returns to step S30, and if not returned, the process is repeated from step S40 to trace. Continue control.
Although FIG. 8 shows the case where there is only one observer, although the mechanism is complicated, it is possible to deal with a plurality of observers by providing a plurality of light sources and a light source moving mechanism. .

(Embodiment 2) In Embodiment 1, the light source for the right eye and the light source for the left eye of the observer are separately provided, but a liquid crystal shutter is provided in front of the light source 80 in FIG. , The shining part is alternately switched in the order of 80a → 80b → 80a, and in synchronization, the transmissive liquid crystal display as the spatial modulation element is switched between right eye → left eye → right eye.
Time-division display is possible with one light source and one spatial modulation element.

(Third Embodiment) Although a little more expensive than the first embodiment, as shown in FIG. 12, a sensor group 91 is arranged on the display screen of the observer image display device 12a, and each sensor is arranged. A lamp group 92 composed of lamps that illuminate in a predetermined area corresponding to the light sense can be provided for replacement, and in this case, a complicated mechanism for tracing a light spot is not required and a tracking error does not occur. .

[0033]

As described above, according to the present invention,
It does not require glasses that have a function to sort left and right, allows multiple people to stereoscopically view at any position without depending on the position of the observer, and can display bright stereoscopic images using a lamp with high brightness as a light source. The present invention provides a stereoscopic image display device and a single infrared lamp for illuminating an observer and a camera, so that the device can be downsized. It will greatly contribute to the expansion of applications.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a stereoscopic image display device according to a first reference example of the present invention.

FIG. 2 is an operation explanatory diagram of the stereoscopic image display device in Reference Example 1 of the present invention.

FIG. 3 is a characteristic diagram showing a light emission wavelength distribution of a light used in the stereoscopic image display device in Reference Example 1 of the present invention.

FIG. 4 is a cross-sectional view of a photographing device used for a stereoscopic image display device in Reference Example 1 of the present invention.

FIG. 5 is an operation explanatory diagram of the stereoscopic image display device in Reference Example 1 of the present invention.

FIG. 6 is a configuration diagram of a stereoscopic image display device according to a second reference example of the present invention.

FIG. 7 is a configuration diagram of a stereoscopic image display device according to the present embodiment.

FIG. 8 is a front view of a configuration example of the backlight device according to the first or second embodiment.

FIG. 9 is a diagram of a configuration example of the backlight device according to the first or second embodiment as viewed from above.

FIG. 10 is a diagram showing a configuration example of a light spot tracking sensor and a light spot moving direction in the first or second embodiment.

FIG. 11 is a flowchart showing a control procedure of light spot tracking in the first or second embodiment.

FIG. 12 is a front view of a configuration example of a backlight device according to a third embodiment.

FIG. 13 is a configuration diagram of a first example of a conventional stereoscopic image display device.

FIG. 14 is a configuration diagram of a second conventional stereoscopic image display device.

[Explanation of symbols]

 10a, 10b Transmissive liquid crystal display 11a, 11b Lens 12a, 12b Monochrome CRT 13, 13a, 13b LED 14, 14a, 14b Monochrome CCD camera 15 Half mirror 16, 17 Observer 18 Difference processing device 30 Imaging lens 31a, 31b Interference filter 32 image sensor 33 drive circuit 80 light source 81, 82 moving axis 83 light spot tracking sensor 91 sensor group 92 lamp group

Claims (4)

[Claims] 1. A stereoscopic image display device for observing different images to the left and right eyes of an observer, the spatial modulation element having a light transmitting element for displaying a stereoscopic image to be displayed, and the spatial modulation element. A backlight device for illuminating from the back surface, and an optical element having directivity for enlarging the display surface of the backlight device, wherein the backlight device corresponds to the position of the face of the observer. Display means for displaying a figure and illuminating means for following the position of the figure displayed on the display means and illuminating the spatial modulation element with light having a higher brightness than the display means from positions corresponding to the left face and the right face. And a stereoscopic image display device. 2. The spatial modulation element and the backlight device are provided in pairs, two stereoscopic images for the right eye and the left eye are displayed respectively, and the displayed stereoscopic images are combined by a combining means. The stereoscopic image display device according to claim 1. 3. The spatial modulation element alternately displays a stereoscopic image for the right eye and a stereoscopic image for the left eye in a time-sharing manner, and the light-emitting display device pulsates to the time-sharing display of the spatial modulation element to time-divisionally display the image. The stereoscopic image display device according to claim 1, wherein the stereoscopic image display device is switched by. 4. The three-dimensional image display device further comprises photographing means for photographing the observer, and the display means displays the face image of the observer photographed by the photographing means as a figure. Any one of claims 1 to 3
The stereoscopic image display device described in 1.