JPS63261978A - 3D video display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a three-dimensional image display device capable of displaying three-dimensional images.

[Conventional technology]

In conventional three-dimensional image display devices, for example,
As described in Japanese Patent No. 26278, in order to view the three-dimensional image, it is necessary to wear special glasses, or it is necessary to limit the viewing position to a specific location.

[Problem that the invention seeks to solve]

As mentioned above, the above-mentioned conventional technology has the problem of being inconvenient and inconvenient in that it requires special glasses to be worn or the viewing position is limited.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a three-dimensional image display device that is easy to use and does not require the wearing of special equipment (such as glasses) or limitation of the viewing position. It is about providing.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention includes at least a display means formed by stacking a plurality of flat display units capable of displaying images and transparent display at a predetermined interval, and The obtained video information is separated according to the distance information from the imaging means to each subject photographed by the imaging means, and among the separated video information on the same screen, the distance from the imaging means is closest. The image information of the object is displayed on a flat display unit closer to the viewing side or on the same flat display unit than the image information of the object further away, and the image information of the object is further away from the imaging means. In this method, a three-dimensional image is obtained by displaying image information of a closer object on a flat display unit that is farther from the viewing side or on the same flat display unit.

[Effect]

In the present invention, the display means is constructed by stacking a plurality of flat display units at predetermined intervals. Then, the video information obtained from the imaging means is separated according to information on the distance from the imaging means to each subject photographed by the imaging means, and the separated video information is displayed on each of the display means as described above. By displaying on a flat display unit, a pseudo three-dimensional display is possible.
A three-dimensional image can be viewed without special glasses such as glasses for switching shutters, and the three-dimensional image can be viewed without losing the stereoscopic effect even if the viewing position is slightly shifted.

Note that information on the distance from the imaging means to each subject may be detected by using two imaging devices in advance and computer processing the video signals obtained from them. An infrared emitting device and an infrared receiving device are provided, and detection can be made from the time it takes for pulsed infrared rays emitted from the emitting device to be reflected by a subject and received by the light receiving device, or from the intensity of the received infrared rays.

〔Example〕

An embodiment of the present invention will be described below.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, 1 is a subject, 2 is an imaging camera, 3 is its output terminal, 4 is a cable, 5 is an infrared emitting device, 6 is an infrared receiver, 7 is its output terminal, 8 is a cable, 1
0 is a display device, 11 is a video signal separation circuit, 12
．． 13 is its output terminal, 14 is a liquid crystal panel for displaying foreground,
15 is a liquid crystal panel for distant view display.

The display device 10 shown in FIG. 1 includes a video signal separation circuit 11 and a liquid crystal layer separated by glass having a predetermined thickness.
It consists of a layered liquid crystal display. That is, the liquid crystal display is composed of a liquid crystal panel 14 for displaying a close view and a liquid crystal panel 15 for displaying a distant view, each of which is capable of transparent display.

First, by photographing the subject 1 with the imaging camera 2, a normal imaged video signal is obtained at the output terminal 3 and sent to the display device 10 via the cable 4. Note that although the cable 4 is used in this embodiment, it is also possible to transmit wirelessly like a normal television signal.

The imaging camera 2 is also equipped with an infrared emitting device 5 and an infrared receiving device 6. The infrared emitting device 5 emits infrared rays, and the infrared receiving device 6 receives the reflected infrared rays reflected by the subject 1, and obtains the distance (perspective information) from the imaging camera 2 to the subject 1 based on the intensity of the reflected infrared rays. For the specific configuration and operation of this part, for example, Japanese Patent Application Laid-Open No. 57-32409, ``Focusing Control Device,'' which relates to an autofocusing means for a video camera using infrared rays, may be applied.

However, in the infrared distance measurement used in autofocus, etc., infrared rays are always emitted toward the subject located in the center of the image capture screen, and distance information only in the center of the image capture screen is measured. However, in this embodiment, it is necessary to obtain perspective information for all image information within the imaging screen.

Therefore, the infrared emitting device 5 emits infrared rays while controlling the emission angle of the infrared rays in accordance with the scanning of the imaging camera 2 during imaging. Then, the infrared receiving device 6 measures the distance (near and distance information) from the intensity of the reflected infrared rays, detects whether the distance is greater than or less than a predetermined distance, and forms a gate pulse based on the detection result. Output terminal 7
It is output from.

A gate pulse based on this perspective information is then sent to the display device 10 via the cable 8.

This gate pulse can also be sent wirelessly like the video signal. Note that in order to perform three-dimensional display, signal information corresponding to one dimension is necessarily required in excess of that for normal two-dimensional display, and in this embodiment, the gate pulse corresponds to this.

The video signal and gate pulse are applied to a video signal separation circuit 11 in the display device 10.

The video signal separation circuit 11 is composed of, for example, an analog switch that can switch signal paths depending on the DC voltage level. That is, the signal path of the video signal is switched by the gate pulse, and when the gate pulse represents a near view, the video signal is taken out as a foreground video signal from the output terminal 12 of the video signal separation circuit 11, and when it represents a distant view, is taken out from the output terminal 13 as a distant view video signal.

Each video signal is transmitted to the foreground display liquid crystal panel 1.
4 and the distant view display liquid crystal panel 15, and an image is displayed on each liquid crystal panel.

The foreground video signal and the distant view video signal applied to the foreground display liquid crystal panel 14 and the distant view display liquid crystal panel 15 are as follows:
The white level signal is used for all periods other than the period in which valid image information exists (however, since the predetermined period including the synchronization signal does not appear on the screen, the level during that period may be any level). do not have.). As a result, the portions of each liquid crystal panel corresponding to the white level become completely transparent, and the effective image display contents of distant and near views and their visibility can be completely unaffected.

The liquid crystal panel 14 for displaying a close view is the liquid crystal panel 15 for displaying a distant view.
Because the images are overlapped at a predetermined distance via a glass plate or the like, the foreground and distant images are displayed at different positions on the screen, and the two make up the entire screen. Therefore, a normal two-dimensional display can display three-dimensional images that cannot be expressed.

Next, the configuration and operation of each device in this embodiment will be specifically explained.

First, let's talk about the infrared emitting device 5 shown in FIG.

Generally, when taking an image, the position of the imaging lens of the imaging camera 2 may be manipulated to perform wide-angle photography or narrow-angle photography. It is necessary to control the deflection and emission angle of infrared rays.

Therefore, we will discuss the deflection and emission angle control of infrared rays for distance measurement as the shooting range changes during wide-angle shooting or narrow-angle shooting.
This will be explained below using figures.

FIGS. 2(a) and 2(b) are plan views showing the main components of the infrared emitting device in FIG. ), and FIG. 2(b) shows a case where the subject is photographed at a wide angle (that is, wide-angle photography).

As shown in FIGS. 2(a) and 2(b), the infrared emitting device 5 includes an infrared light emitting diode 20. Polygon mirror 21 for horizontal deflection of infrared rays. It mainly consists of a galvanometer mirror 22 for vertically deflecting infrared rays.

When photographing a subject in close-up as shown in Fig. 2(a), the angle of view of the lens in the imaging camera 2 becomes small;
Since the infrared deflection range may be narrow, the light emitted from the infrared light emitting diode 20 enters the polygon mirror 21 near the rotation center and is reflected. Polygon mirror 21 is arrow 2
3, the light reflected at the zero point on the surface of the polygon mirror 21 is rotated according to the rotation axis 2 of the galvanometer mirror 22.
is deflected between points C and D on 4. Next, the infrared rays radiated onto the rotating shaft 24 of the galvano mirror 22 are vertically deflected as the galvano mirror 24 rotates in the vertical direction (in the figure, perpendicular to the plane of the paper) (sawtooth reciprocating motion).

Through the above operation, the infrared rays emitted from the infrared emitting device 5 attached to the imaging camera 2 are deflected horizontally and vertically as the imaging points on the imaging screen of the imaging camera 2 are scanned at each instant, and each imaging point is The distance to the object corresponding to the distance can be detected.

Next, as shown in Fig. 2(b), when photographing a subject in wide-angle mode, the operation is basically the same as that described in Fig. 2(a) above.However, as shown in Fig. 2(a), ) The characteristic of FIG. 2(b) compared to the case of In this way, the horizontal deflection angle of the infrared rays can be widened.In addition, the width of the sawtooth reciprocating motion of the galvano mirror 22 can also be increased in line with the above. , the vertical deflection angle can also be increased.

By the way, when configuring such an infrared emitting device 5, it should be noted that when the relative positions of the infrared light emitting diode 20 and the polygon mirror 21 are changed, first of all, the reflected light from the polygon mirror 21 is The relative position of each component should be maintained so that the infrared rays are incident on the rotating shaft 24 of the galvanomirror 22. Second, the infrared emission direction (BB') corresponding to the center of each horizontal and vertical direction should be It should always be kept pointing exactly in front of the center of the imaging camera body. During actual structural design, consideration must be given to ensure that these conditions are always satisfied, and from Fig. 2(a) to Fig. 2(b).
) or from FIG. 2(b) to FIG. 2(a) is designed to be changed to a predetermined relative position in conjunction with the imaging lens position adjustment (i.e., up/wide adjustment). be done.

Next, the infrared light receiving device 6 shown in FIG. 1 will be explained.

The infrared receiving device 6 receives the emitted infrared rays and the infrared rays reflected by the subject 1. Then, the following operation is performed to obtain the distance (perspective information) to the subject from the received infrared light.

That is, the first method, which is the simplest, is to measure the intensity of the reflected infrared rays received and determine whether or not the intensity is within a certain range, that is, by setting a threshold level to determine distance information. be. In this case, it is preferable that the threshold level is controlled in conjunction with the aperture/wide adjustment during photographing. The intensity of reflected infrared rays is inversely proportional to the square of the distance to the subject, and the value differs greatly (several tens of dB or more) between close-up photography and long-distance photography. You can choose fairly roughly, such as being able to choose at Seahold level. In addition, as mentioned above, there is a level difference of several tens of dB or more between close-up shooting and distant-view shooting, so for example, if you measure the reflected infrared ray intensity distribution within one field and look at the measurement results, You can clearly see the difference in the level between the distance and distance shooting, and therefore you can set the threshold level somewhere in between.

Note that the intensity of reflected infrared rays is affected not only by the distance to the subject (perspective information) but also by the color of the subject (reflectance).
The time difference between the emitted infrared rays and the received infrared rays may be determined by means of triangulation as described in Japanese Patent No. 7-32409, or by means of a limiter and balance modulation as shown in FIG. The configuration may be such that the component is detected and distance information is accurately obtained.

3 is a circuit diagram showing an integrated example of the infrared light receiving device in FIG. 1, and FIG. 4 is a waveform diagram showing main signal waveforms in FIG. 3.

In FIG. 3, 30 is an infrared light emitting diode, 31 is an applied voltage source, and these are located in the infrared emitting device 5. One of the infrared rays generated here directly enters the light receiving diode 32 in the infrared light receiving device 6, and the other, after being reflected by the subject 1, enters the light receiving diode 33 and is photoelectrically converted.

The DC component of the pulsed infrared rays photoelectrically converted by the light receiving diode 33 is cut off by the capacitor 34. This is to separate infrared rays emitted from the subject 1 itself (if the subject itself emits infrared rays in some form) and infrared rays for distance measurement. Thereafter, after a predetermined amplification is performed by an amplifier 35, the signal passes through a base clip circuit consisting of anti-parallel connected diodes 36 and 37.

This base clip circuit is a type of threshold circuit, and performs threshold discrimination on input signals by clipping operation. Therefore, for example, when photographing an extremely distant object, the intensity of infrared rays incident on the photodiode 33 is small, and the output voltage amplitude of the amplifier 35 is also considerably small, so that it cannot pass through this circuit and is transmitted to the next stage. No further signal processing is performed. On the other hand, the pulse amplitude of the signal that has passed through this base clip circuit is made constant by the next limiter amplifier 38. Further, 39 is a capacitor, and 40 is a limiter amplifier. Therefore, the output signal 41 of limiter amplifier 40 and the output signal 42 of limiter amplifier 38
The waveform of is as shown in FIG. 5, for example.

These are an infrared pulse directly obtained from the light emitting diode 30 and an infrared pulse obtained by reflection from the subject 1, and the time difference between them, that is, the phase difference, determines the distance to the subject (perspective information). show. signal 41
and 42 are input signals of a phase detector (or balanced modulator) 43, and a pulse signal 4 corresponding to the phase difference of the input signals
4 at its output terminal. Smoothing capacitor 4 for signal 44
5, a DC voltage corresponding to the distance to the subject 1 (perspective information) is obtained at the terminal 46.

When the phase difference between the signals 41 and 42 is small, the DC voltage obtained by the phase detector 43 and the smoothing capacitor 45 is
In other words, when the distance to subject 1 is short), the phase difference becomes large (in other words, when the distance to subject 1 becomes long)
In the above-mentioned base clip circuit, if the output voltage amplitude of the amplifier 35 is small and it is impossible for the signal to pass (that is, if the distance to the subject 1 is extremely long), the maximum value is reached. Configured to indicate voltage.

Therefore, by inputting the DC voltage of the terminal 46 to the comparator 47 and comparing it with the voltage of the reference power supply 48, the game pulse 50 as shown in FIG. 5 is generated depending on whether the DC voltage is above or below a predetermined level. It can be generated from the output terminal 7.

Next, the video signal separation circuit 1 shown in FIG. 1 separates the video signal into a foreground video signal and a distant view video signal using a gate pulse.
1 will be explained.

FIG. 5 is an explanatory diagram for explaining the operation of the video signal separation circuit in FIG. 1.

FIG. 5(A) shows an example of a screen in which a close view (two people) and a distant view (background) are displayed. At this time, the gate pulse for separating the foreground/distant image signal corresponding to one horizontal scanning period indicated by 00'' on the screen is generated by the infrared light receiving device 6 as the pulse shown in FIG. 5(B). This is obtained as a voltage waveform.In the foreground photographing portions tt~t3 and t4~t during the horizontal scanning period, the gate pulse is at a low voltage level, and in the distant view 1 shadowiest portion t1~L!+
From t3 to t4+ and from tS to t6, the gate pulse is at a high voltage level. Furthermore, the video signal of the oO' scanning line on the screen (including both foreground and distant view) is no different from a normal television signal, as shown in FIG. 5(C).

A specific example of the video signal separation circuit 11 that uses this video signal and gate pulse to separate a foreground video signal and a distant view video signal is shown in FIG. 6 and will be described.

The video signal separation circuit 11 shown in FIG. 6 basically consists of a differential amplifier circuit. That is, transistors 60 to 65 constitute a fully balanced differential amplifier. 66 is a current source, 67 is a power supply voltage terminal, 68.69 is a bias constant voltage power supply, 70 to 73 are bias resistors, and 74.75 is an output resistor. The video signal shown in FIG. 5(C) is applied from the terminal 76 to the base of the transistor 61 via the capacitor 77.

FIG. 7 is a waveform diagram showing main signal waveforms in FIG. 6.

In FIG. 7, (A) is the video signal shown in FIG. 5(C), and (B) is the gate pulse shown in FIG. 5(B). However, the voltage polarity of the video signal in FIG. 7(A) is inverted, and the gate pulse in FIG. 7(B) is assumed to be at a high level during the synchronization signal period.

This gate pulse is applied to the terminal 78 shown in FIG.
Depending on the high level or low level state of the gate pulse, the transistors 62 to 65 are turned on/off and switched. As a result, video signals as shown in FIGS. 7(C) and 7(D) are obtained at the output terminals 79 and 80, respectively.

That is, a video signal is output to the terminal 79 only when the gate pulse is at a low level, and during a high level period, an output voltage is obtained from the DC current flowing through the transistor 62, and becomes an average DC voltage in the output voltage dynamic range.

On the other hand, a video signal is outputted to the terminal 80 only during the period when the gate pulse is at a high level, and during the period when the gate pulse is at a low level, the average DC voltage of the output voltage dynamic range becomes the same as described above.

In this way, the video signal shown in FIG. 7(A) is converted to the video signal shown in FIG. 7(C).
It was possible to separate the foreground video signal shown in FIG. 7 and the distant view video signal shown in FIG. 7(D). However, as it is, there is a problem with the display on the actual LCD panel during the period when the average DC voltage is output, and in the case of foreground video signals, a white peak signal is given at the time when the distant view is captured, and the LCD panel for foreground display 14 becomes completely transparent, and conversely, in the case of a distant view image signal, a white peak signal is given at the time of foreground imaging, and the distant view display liquid crystal panel 15
It is preferable that the light is completely transparent.

Therefore, in order to make this possible, the video signal separation circuit 11 shown in FIG. . As a result, the actual video signals obtained at the output terminals 79 and 80 are as shown in FIG. 7(E).

As shown in (F), a white peak voltage is applied outside the effective video signal period, and the foreground display liquid crystal panel 14 is controlled by the foreground video signal shown in FIG. 7(E) as shown in FIG. 7(F). By driving each of the liquid crystal panels 15 for distant view display using the distant view video signal, the above-described desired display can be achieved.

Note that in FIG. 6, the distant view video signal obtained from the output terminal 79 (FIG. 7 (E)) does not include a synchronization signal, and the synchronization signal period is a white peak voltage. This video signal is a video signal for driving the liquid crystal panel,
There is no problem because the voltage level during the synchronization signal period does not affect the basic operation or display image quality. The signal timing for vertical/horizontal scanning can be created, for example, from the video signal shown in FIG. Good. Of course, it is also possible to add a synchronization signal to the foreground video signal shown in FIG. 7(E) using ordinary electronic circuit technology, but the explanation will be omitted here.

Next, the liquid crystal display in the display device 10 shown in FIG. 1 will be explained.

FIG. 8 is a sectional view showing a specific example of the liquid crystal display in the display device in FIG. 1.

The liquid crystal display shown in FIG. 8 is a three-dimensional display consisting of a double liquid crystal layer.

In FIG. 8, 90, 91, and 92 are glass plates.

The central glass plate 91 may be composed of two sheets for ease of manufacture. 93.94 is a liquid crystal layer.

For example, when the liquid crystal display of FIG. 8 is of an active matrix type, a pixel switch and a pixel electrode made of a thin film transistor, and a pixel electrode for driving the thin film transistor are provided on the inner surface of the glass 90 on the liquid crystal 11193 side, although not shown. Signal line.

Scanning electrode lines and the like are formed, as well as an alignment film and the like. On the other hand, a color filter, a counter electrode, an alignment film, etc. are formed on the surface of the glass 91 on the liquid crystal layer 93 side.

That is, the liquid crystal display section sandwiched between glasses 90 and 91 can normally display images corresponding to the drive signals by applying drive signals and scanning signals in the same way as a normal liquid crystal display. Similarly, glass plate 91
The liquid crystal display section sandwiched between and 92 is also capable of displaying normal images, and may be a passive matrix type liquid crystal display. The liquid crystal display, which is a three-dimensional display, irradiates light from the side opposite to the viewing side using a backlight 95, and allows images to be observed in a transmissive manner.

The feature of this liquid crystal display is the two-layer liquid crystal layer 93.9
4, and even if the number of layers is plural, the display as a whole has two polarizing plates 96°97. In FIG. 8, for example, even if the glass 91 is made of two layers and two liquid crystal displays are completely stacked, it is better to use two polarizing plates in one set because there is no reduction in light transmittance in the polarizing plates. A bright image can be obtained.

In addition, as a display for three-dimensional display, in Fig. 8,
A liquid crystal display consisting of two liquid crystal panels was used, but
For example, a transparent EL (electroluminescent) EL (Electro Luminescent) becomes transparent when a predetermined voltage is applied, and can also display images depending on the voltage.

Luminescent) may also be used. Moreover, an opaque EL display device is used instead of the liquid crystal layer 93, and the liquid crystal layer 9
4 can be stacked to form a three-dimensional display.

In the above description, a two-layer liquid crystal panel is used to display images separately for near and distant views, but it is also possible to display three or more types of images using a three-dimensional display having three or more layers.

In addition, in the embodiment shown in FIG. 1, if all images are displayed on the liquid crystal panel 14 without dividing the video signal, and the liquid crystal panel 15 is in a completely transparent state, the display device 10 can display a normal television signal. Ordinary two-dimensional display is also possible.

Now, in the embodiment of FIG. 1, the video signal separation circuit 11 is
The display device 10 was placed on the receiving side rather than the imaging camera 2, that is, on the transmitting side, and there were two types of transmission signals, one type of video signal and one type of gate signal.As shown in FIG. Place the circuit 11 on the transmitting side,
It is also possible to transmit two types of video signals: near view and distant view.

FIG. 9 is a block diagram showing another embodiment of the present invention.

In Figure 9, the parts showing the same contents as Figure 1 are
Numbered the same as in the figure.

In this embodiment, the near-view video signal is sent from the output terminal 12 to the cable 16, and the distant-view video signal is sent from the output terminal 13 to the cable 1.
7, the signals are transmitted to display liquid crystal panels 14 and 15, respectively.

In this embodiment, there is a problem that the transmission capacity of the transmission cable is larger than that in the embodiment shown in FIG. 10 has the advantage that the entire system can be constructed at a low cost.

〔Effect of the invention〕

As explained above, according to the present invention, there is provided a three-dimensional image display device capable of displaying pseudo-stereoscopic images without the need for special glasses or the like and without being limited to a narrow viewing position. It can be realized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a plan view showing the configuration of essential parts of the infrared reflecting device in FIG. 1, and FIG. 3 is a specific example of the infrared receiving device in FIG. A circuit diagram showing an example, FIG. 4 is a waveform diagram showing the main signal waveforms of FIG. 3, FIG. 5 is an explanatory diagram for explaining the operation of the video signal separation circuit in FIG. 1, and FIG. 1 is a circuit diagram showing a specific example of the video signal separation circuit, FIG. 7 is a waveform diagram showing the main signal waveforms of FIG. 6, and FIG. 8 is an example of a liquid crystal display in the display device in FIG. 1. FIG. 9 is a block diagram showing another embodiment of the present invention. Explanation of symbols 2... Imaging camera, 5... Infrared emitting device, 6...
・Infrared receiver, 10...Display device, 11
...Video signal separation circuit, 14...LCD panel for close view display, 15...LCD panel for distant view display Patent attorney Akio Namiki Figure 2 Figure 3 Figure 4 Figure 5 Stone 1 Tumor Zu 3 Jou 4 Yu 5 Sword 6 IEa Diagram

Claims (1)

[Scope of Claims] 1. At least a display means consisting of a plurality of flat display units capable of displaying images and transparent display stacked one on top of the other at a predetermined interval, and displaying image information obtained from an imaging means. are separated according to distance information from the imaging means to each subject photographed by the imaging means, and among the separated video information within the same screen, the video information of the subject whose distance from the imaging means is short is , the image information of the object that is further away from the imaging means is displayed on a flat display unit closer to the viewing side or on the same flat display unit than the image information of the object that is further away from the imaging means. A three-dimensional image display device characterized in that a three-dimensional image is obtained by displaying image information of a nearby object on a flat display unit that is farther from the viewing side or on the same flat display unit. . 2. A three-dimensional image display device comprising the following components. (b) Imaging means. (b) Emit pulsed infrared rays, etc. (hereinafter simply referred to as infrared rays) from the imaging position of the imaging means, receive the infrared rays that are reflected by the subject and return to the imaging position, and receive the received infrared rays. Means for detecting information on the distance from the imaging position to the subject based on the intensity of the emitted infrared rays and the time difference between the emitted infrared rays and the received infrared rays. (c) Means for converting the detected distance information into a plurality of quantized DC voltage levels by threshold discrimination, and generating gate pulses corresponding to the DC voltage levels. (d) Means for deflecting and controlling the emission angle of the infrared rays in the horizontal and vertical directions in accordance with the point-sequential imaging scanning position for each time within the effective imaging screen of the imaging means. (E) Means for separating the video signal obtained from the imaging means into a plurality of types of video signals on the time axis according to the level of the gate pulse. (f) Means for inserting a white peak signal into each of the plurality of separated video signals at least in a portion other than the portion containing the effective video signal component within the scanning period. (g) A plurality of flat display units are stacked one on top of the other at a predetermined interval, and when each video signal into which the white peak signal is inserted is supplied to the corresponding flat display unit, a foreground image is displayed. The video signal containing the foreground image is supplied to a flat display unit located closer to the viewing side than the video signal containing the distant view image, which is further away from the foreground image, and the video signal containing the distant view image is supplied to the flat display unit located closer to the viewing side. A video signal containing a foreground image that is closer than the image is supplied to a flat display unit located further from the viewing side, and at least a flat display other than the flat display unit furthest from the viewing side. The transmittance of the unit is controlled according to the level of the effective video signal among the supplied video signals, and the white peak signal causes the unit to enter a transparent display state. A display means whose light emission amount or transmittance is controlled according to the level of an effective video signal among the video signals, and whose light emission amount reaches the maximum amount or becomes a transparent display state depending on a white peak signal.