JPH07336729A - Image display device - Google Patents

Abstract

PURPOSE:To obtain a image display device in which a stereoscopic image and a 2-dimension image are observed sharply. CONSTITUTION:A stereoscopic image signal detection circuit 1 is provided to a control means 10 controlling an eyeglass 5 with shutter, the circuit 1 detects whether or not an input video signal 101 is a stereoscopic image signal (3D) and when the video signal 101 is the 3D signal, the shutter for both eyes provided to the eyeglass 5 is switched as 5b, 5c in figure synchronously with the switching of odd number and even number fields on a monitor 4. When the video signal 101 is not the 3D signal, both shutters of the eyeglass 5 are simultaneously open (5a) or closed (5d) to allow both eyes to observe a screen of the monitor 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device for viewing stereoscopic images and non-stereoscopic images.

[0002]

2. Description of the Related Art A stereoscopic image display device capable of viewing a stereoscopic image by utilizing the parallax of both eyes of a human is already known, and two examples of conventionally known stereoscopic image display devices will be described below. This will be described with reference to FIGS. 5 and 6.

FIG. 5 shows a first example of a known stereoscopic image display device. An observer looking at the screen of the monitor 4 such as a television receiver constituted by a known CRT (cathode ray tube) is put on the glasses 60 with a liquid crystal shutter, and an odd field is displayed on the screen of the monitor 4 by an interlaced video signal. At the moment, the shutter of the right lens 60a of the spectacles 60 is closed and only the left lens 60b is in the light-transmitting state so that the left eye of the observer observes the odd field image on the monitor 4, When an even field image is displayed on the screen of the monitor 4 at the moment of, the shutter of the left lens 60b of the glasses 60 is closed and the shutter of the right lens 60a is opened in synchronization with the video signal of the even field to open the right side of the observer. It is configured so that the eye can observe the even field image on the monitor 4. Incidentally, 101 is an interlaced video signal sent from the transmission source, 2 is an O / E separation circuit for separating an odd field signal and an even field signal of the video signal, and 3 is an output of the O / E separation circuit 2 ( That is, a shutter drive circuit that controls the opening / closing operation of the liquid crystal shutters of the eyeglasses 60 based on the odd and even field determination signals.

FIG. 6 is a diagram showing a second example of a known stereoscopic image display device. In this device, the observer of the monitor 4 wears the pair of left and right polarized glasses 40 having different polarization directions, and the polarizing plate 9 composed of a liquid crystal cell or the like is provided between the observer and the monitor 4. When the odd-numbered field of the interlaced video signal 101 is displayed on the screen of the monitor 4, the polarization direction of the polarizing plate 9 is changed to the glasses 40.
The polarization direction of the polarizing plate 9 is set to the same state 9a as the polarization direction (that is, the vertical direction) of the left lens 40a, and the polarization direction of the polarizing plate 9 is changed at the moment when the even field of the video signal is displayed on the screen of the monitor 4. The state is switched to the same state 9b as the polarization direction (that is, the horizontal direction) of the right lens 40b. Therefore, while the observer's left eye recognizes an image of an odd field while the right eye recognizes an image of an even field, it is recognized as a stereoscopic image due to the parallax of both eyes. .

Reference numeral 2 is the above-mentioned O / E separation circuit, and 8 is a polarization drive circuit for switching the polarization direction of the polarizing plate 9 according to the output of the O / E separation circuit 2.

[0006]

Since the above-mentioned known image display device is configured only for allowing the observer to observe a stereoscopic image, the device allows the observer to observe a two-dimensional image. In this case, various troubles occur as follows.

Glasses and polarizing plates having light-shielding means such as liquid crystal shutters originally have a low transmittance, and the amount of light entering one eye is less than half the amount of light of an actual image, so only a dark image can be seen.

Since the screen of one field is viewed by only one eye, the resolution is halved, so that only an image with a blurred outline can be seen.

Since the screen of one of the fields is seen by only one eye, only the screen with a lot of flicker can be seen, which is very difficult to see.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide an image display device capable of clearly seeing both a stereoscopic image and a planar image, and the object of the invention for each claim of the present invention will be described below. Make it clear.

A first object of the present invention is to provide a main display means for alternately displaying an odd field and an even field on a display screen based on an interlaced video signal inputted from a video signal source, and a main display means. Display auxiliary means arranged between an observer observing the screen of the main display means and the screen to change the visual image for the observer, and the main display means and the display according to the type of the interlaced video signal. Control means for changing the display state of at least one of the auxiliary means, wherein the control means is a stereoscopic image signal detecting means for detecting whether or not the video signal is a stereoscopic image signal, and the stereoscopic image signal detecting means. Display control means for changing the display state of at least one of the main display means and the display auxiliary means according to the detection result of the image signal detection means, and the stereoscopic image signal detection means It is to provide an image display device including a correlation evaluation means for determining a correlation between the odd and even fields of the signal.

A second object of the present invention is to provide an image display having the structure of claim 1, wherein the display assisting means is configured as a light-shielding means capable of separately shielding the light incident on both eyes of the observer into right and left. The display control means has a light-shielding means driving means for driving the light-shielding means, and the light-shielding means driving means operates in accordance with the first detection result of the stereoscopic image signal detecting means. A first function of driving the light shielding means so as to alternately change the light shielding state for the left and right eyes of the observer in synchronization with each of the odd field and the even field of the screen, and the three-dimensional image signal detection means And a second function of driving the light shielding means so that both eyes of the observer are simultaneously shielded from the left and right sides or simultaneously transmitted from the left and right sides according to the detection result. Image display device It is when.

A third object of the present invention is to provide an image display apparatus having the structure of claim 1, wherein the display assisting means is a first polarizing means arranged immediately before the screen of the main display means, and the observation means. Second polarizing means having polarization directions different from each other for each of the left and right eyes of the person, and the display control means includes an odd field and an even field of a video signal input to the main display means. Polarization drive means for changing the polarization direction of the first polarization means in synchronism with the switching of the first polarization means, image signal conversion means for increasing the field frequency of the input video signal, and a detection result of the stereoscopic image signal detection means. Image signal selecting means for selecting either the output of the image signal converting means or the input video signal and inputting to the main display means, and the output of the image signal converting means is the main display means. When input to Driving means is to provide an image display apparatus characterized by increased in synchronization with the frequency of the polarization direction of the switching operation of said first polarizing means in the field frequency of the output of said image signal converting means.

[0014]

In order to achieve the first object of the present invention, the first invention according to claim 1 is based on an interlaced video signal input from a video signal source. Main display means for alternately displaying an odd field and an even field on the display screen at a predetermined cycle,
Display assisting means arranged between an observer observing the screen of the main display means and the screen to change a visual image for the observer, the main display means and the display means depending on the type of the interlaced video signal. Control means for changing the display state of at least one of the display assisting means, the control means comprising: a stereoscopic image signal detecting means for detecting whether or not the video signal is a stereoscopic image signal; Display control means for changing the display state of at least one of the main display means and the display auxiliary means according to the detection result of the stereoscopic image signal detection means, wherein the stereoscopic image signal detection means is an odd number of the video signals. A correlation evaluation means for obtaining a correlation between the field and the even field, and a table for at least one of the main display means and the display auxiliary means depending on whether or not the video signal is a stereoscopic image signal. By changing the state, there is provided an image display device which can clearly perform each observation and the observation and the plane image of the stereoscopic image.

In order to achieve the second object of the present invention, the second invention according to claim 2 is the structure of claim 1, wherein the display assisting means is incident on both eyes of the observer. It is configured as a light-shielding device that can separately shield light from the left and right,
The display control means has a light-shielding means driving means for driving the light-shielding means, and the light-shielding means driving means displays the screen of the main display means in accordance with the first detection result by the stereoscopic image signal detecting means. The first function of driving the light shielding means so as to alternately change the light shielding state for the left and right eyes of the observer in synchronization with each of the odd field and the even field, and the second function by the stereoscopic image signal detecting means. A second function of driving the light shielding means so that both eyes of the observer are simultaneously shielded to the left and right or simultaneously transmitted to the left and right according to the detection result, and the video signal is a stereoscopic image. When the signal is not a signal, the light-shielding means is simultaneously shielded or simultaneously transmitted to both eyes of the observer, so that the stereoscopic image and the planar image can be clearly observed. Provide display device Is shall.

In order to achieve the third object of the present invention, the third invention according to claim 3 is the structure of claim 1, wherein the display assisting means is provided immediately before the screen of the main display means. The display control means is composed of a first polarizing means arranged and a second polarizing means whose polarization directions are different from each other for each of the left and right eyes of the observer. Polarization driving means for changing the polarization direction of the first polarizing means in synchronization with switching between an odd field and an even field of an input video signal, and an image signal converting means for increasing a field frequency of the input video signal. A video signal selecting means for selecting either the output of the image signal converting means or the input video signal in accordance with the detection result of the stereoscopic image signal detecting means and inputting the selected video signal to the main display means, The output of the image signal conversion means is the main table When inputted to the means, the polarization driving means has a function of increasing the frequency of the switching operation of the polarization direction of the first polarizing means in synchronization with the field frequency of the output of the image signal converting means. When the video signal is not a stereoscopic image signal, the video signal to be input to the main display means is used as the output of the image signal conversion means, and the frequency of switching the polarization direction of the first polarization means is set to the output of the image signal conversion means. It is an object of the present invention to provide an image display device in which even a planar image can be clearly observed by increasing the frequency to the same frequency as the output field frequency.

[0017]

Embodiments of the present invention will be described below with reference to FIGS.

<Embodiment 1> FIG. 1 is a schematic configuration diagram of an image display apparatus according to a first embodiment of the present invention of a system in which eyeglasses with liquid crystal shutters are attached to observe a display screen. The device of the embodiment is an improvement of the conventional stereoscopic image display device shown in FIG.

In FIG. 1, 4 is a known cathode ray tube (CR
T) and a monitor as a main display means composed of a liquid crystal display device and the like, and the monitor 4 has an input video signal 1
Odd field screens and even field screens are displayed alternately according to 01 (interlaced video signal).

Reference numeral 5 denotes eyeglasses with a liquid crystal shutter for wearing by an observer who observes the screen of the monitor 4, and the right and left balls of the eyeglasses 5 are independently changed to a transparent state and an opaque state. In the state of 5a shown in the figure, both balls are in a transparent state, and in 5b, only the right ball is in a non-transparent state.
c indicates that only the left ball is opaque, and 5d indicates that both balls are opaque.

Reference numeral 10 is a control means having a function of controlling the shutters of both the balls of the spectacles 5. The control means 10
A 3D detection circuit 1 for identifying whether or not the input video signal 101 is a stereoscopic image signal (hereinafter abbreviated as 3D), an odd field signal and an even field signal of the video signal 101, and an odd field And an O / E separation circuit 2 having an even field discrimination function, and a shutter drive circuit 3 controlled by the output of the 3D detection circuit 1 and the output of the O / E separation circuit 2.

In the 3D detection circuit 1, when the input video signal 101 is 3D, the output 102 applied to the shutter drive circuit 3 is Hi, and when the video signal 101 is not 3D, the output 102 is Low.

In the O / E separation circuit 2, when the odd field signal of the input video signal 101 is input, the output 201 is Hi.
When the even field signal of the video signal is input, the output 201 becomes Low.

In the shutter drive circuit 3, the input 102 from the 3D detection circuit 1 is Hi and the O / E separation circuit 2
Output 201 is Hi (that is, input video signal 1
01 is a stereoscopic image signal, and the odd field of the input video signal 101 is displayed on the monitor 4), the shutter of the right lens of the glasses 5 is closed as shown in the state 5b of FIG. Open the shutter of the ball and let the observer observe the odd-numbered field screen on the monitor 4 with the left eye.
When the output 201 of the separation circuit 2 is Low (that is, when the even field of the video signal 101 is displayed on the screen of the monitor 4), the glasses 5 are set as in the state 5c in FIG.
The shutter of the left lens is closed (the shutter of the right lens is opened) so that the right eye of the observer observes the even field screen on the monitor 4. Further, the output 102 of the 3D detection circuit 1 is Low (that is, the input video signal 1
01 is a non-stereo image signal), regardless of the output 201 of the O / E separation circuit 2,
The shutter is set to the state 5a or the state 5d in FIG. 1 (that is, both the balls of the spectacles 5 are both in a transparent state or both balls are in a non-transparent state). Therefore, when the spectacles 5 are in the state of 5a in FIG. 1, the observer is in the same state as observing the screen of the monitor 4 with the naked eye, and is the same as seeing the screen of a normal television receiver. The two-dimensional image on 4 (the odd field and the even field are alternately displayed) is to be observed. In this case, since the image on the monitor 4 is viewed with both eyes, there is no shortage of light quantity. You can see images with good resolution and less flicker.

When the video signal 101 is not 3D, the observer can see anything without removing the spectacles 5 when the spectacles 5 enters the state 5d shown in FIG. 1 by the control operation. Since he cannot do so, he must remove the glasses 5 himself and observe the screen of the monitor 4 with the naked eyes.

When the video signal 101 is a non-stereo image signal, the state of the glasses 5 is set to the state 5a or the state 5d.
In the apparatus of this embodiment, it can be configured so that it can be arbitrarily selected. That is, the output 1 of the 3D detection circuit 1
When 02 is Low, the glasses 5 may be in only the state 5a or only in the state 5d.

The 3D detection circuit 1 is a circuit having a correlation evaluation means, and determines whether or not the video signal is a stereoscopic image signal by determining the degree of correlation between the video signal 101 and a predetermined reference signal. Have identified.

<Embodiment 2> FIG. 2 is a view showing the schematic arrangement of an image display apparatus according to the second embodiment of the present invention. The apparatus of this embodiment is a pair of polarizing glasses in which the two eyes have different polarization directions. The present invention relates to an image display device in which 50 is attached so that the screen of the monitor 4 can be observed, and is an image display device improved from the conventional technique shown in FIG.

In the apparatus of this embodiment, the monitor 4 and the polarizing plate 9
There is provided a control means 11 for controlling the 3D detection circuit 1, the image signal conversion circuit 6, a selection circuit 7 for selecting a video signal to be input to the monitor 4, and a polarizing plate 9. It has a polarization drive circuit 8 for driving.

The 3D detection circuit 1 is the circuit described in the first embodiment. When the input video signal 101 is a stereoscopic image signal, the output 102 is Hi, and when the video signal 101 is a non-stereoscopic image signal. Is a circuit in which the output 102 is Low. The output 102 of the 3D detection circuit 1 is applied to the image signal conversion circuit 6, the selection circuit 7, and the polarization drive circuit 8.

The image signal conversion circuit 6 operates when the output 102 of the 3D detection circuit 1 is Low (that is, the input video signal 1).
When 01 is detected to be a non-stereo image signal), a video signal 601 in which the field frequency of the video signal 101 is doubled from 60 Hz to 120 Hz is generated, and the video signal 601 is supplied to the selection circuit 7. Two input signals. The selection circuit 7 selects the video signal 101 (field frequency 60 Hz, that is, 2: 1 interlaced video signal) when the output 102 of the 3D detection circuit 1 is Hi (that is, when the video signal 101 is a stereoscopic image signal). The output signal 701 is input to the monitor 4, and the output 102 of the 3D detection circuit 1 is Low (that is, when the video signal 101 is detected as a non-stereo image signal).
Output video signal 601 (field frequency 120 Hz, that is, 4: 1 interlaced video signal) is selected as an output signal 701, and the monitor 4 outputs the field frequency 120
Input the Hz video signal.

The image signal conversion circuit 6 has a field frequency of 1
When the 20 Hz video signal 601 is generated, the video signal 6
A synchronization signal 602 that changes to Hi and Low in synchronization with each of the odd field and the even field of 01 is output to the polarization drive circuit 8 to be a synchronization signal for switching the output of the polarization drive circuit 8.

The polarization drive circuit 8 is the output 1 of the 3D detection circuit 1.
When 02 is Hi (that is, when the video signal 101 is a stereoscopic image signal), the output 102 synchronizes the switching timing of the polarization direction of the polarizing plate 9 with the field frequency (60 Hz) of the video signal 101, and 3D When the output 102 of the detection circuit 1 is Low (that is, when the video signal 101 is detected as a non-stereo image signal), the drive state is changed by the switching signal 602 which is the second output of the image signal conversion circuit 6. The polarization plate 9 is switched in synchronization with the field frequency 120 Hz of the output video signal 601 of the image signal conversion circuit 6.
The switching drive of the polarization direction is performed. Therefore, the video signal 10
If 1 is a stereoscopic image signal, the video signal 101 is input to the monitor 4 as the output 701 by the selection circuit 7, and is displayed on the monitor 4 as a video signal with a field frequency of 60 Hz (that is, 2: 1 interlace). An odd field and an even field are displayed at a frequency of 60 Hz, and the polarizing plate 9 has a polarization state 9a and a polarization state 9 shown in the figure.
b is switched in synchronization with the switching between the odd field and the even field on the monitor 4. Therefore, the polarized glasses 50
The observer wearing the image signal 101
At the moment when the odd field of the (stereoscopic image signal) is displayed, the odd field image on the monitor 4 is displayed through the polarizing plate 9 vertically polarized as shown in the state 9a of FIG. When observed with the left eye, at the moment when the even field of the video signal 101 is displayed on the monitor 4, it is displayed on the monitor 4 via the polarizing plate 9 switched to the state 9b in FIG. The even field image of will be observed with the right eye.

That is, in the apparatus of this embodiment, when the input video signal 101 is a stereoscopic image signal, the odd field and the even field of the video signal 101 are displayed on the monitor 4 in a 2: 1 interlace. The polarizing plate 9 can switch the polarization direction alternately in synchronization with the field frequency 60 Hz of the odd field and the even field on the monitor 4, but when the video signal 101 is a non-stereo image signal, it is input to the monitor 4. The video signal to be converted becomes a video signal 601 having a field frequency twice as high as a normal frequency, and
The switching cycle of the polarization direction of is also changed in synchronization with the switching between the odd field and the even field on the monitor 4,
Even if the input video signal 101 is a non-stereo image signal, the light amount and resolution of an image viewed by an observer do not decrease, and a screen with less flicker can be observed.

Although the constituent circuit of the control means 11 in FIG. 2 may be configured as an analog circuit, it is preferably configured as a digital circuit.

FIG. 3 shows a concrete example of the control means 11 of the digital system applied to the embodiment of FIG.
1 shows a configuration including a detection circuit 1 and the image signal conversion circuit 6 (excluding a selection circuit 7 and a polarization drive circuit 8).

In FIG. 3, 103 is an A / D converter to which the video signal 101 is input, and 105a to 105d are odd field signals and even field signals (the odd field is indicated by O and the even field is indicated by E). Field memory, which stores the
6 is an address generator for reading and reading stored signals from the field memories 105a to 105d.
9 to 111 are selection circuits, 112 is a D / A converter, 113
Is a correlation circuit including correlation evaluation means.

In the configuration of FIG. 3, the video signal 101 is A
After being converted into the digital signal 104 in the D / D converter 103, the odd field signal is stored in the two odd field memories 105a and 105c sequentially, and the even field signal is stored in the two even field memories 105b and 105d, respectively. It At this time, the odd field memory 105a is sequentially read into the even field memory 105d.

The address signals 107a to 107d of the address signal generator 106 are read out, and the signals 108a to 108d from the respective memories are read by the three selection circuits 10.
9 to 111 are input. The selection circuit 109 corresponds to a component of the image conversion circuit 6 of FIG.
Four signals 108a to 108 read from 105d
One of the d's is selected and output, and the output is converted into an analog signal by the D / A converter 112 and becomes a video signal 601 shown in FIG. 2 (that is, a 4: 1 interlaced video signal).

On the other hand, the field memories 105a to 105
The four signals 108a to 108d read from d are 2
The selection circuits 110 and 111 are also input. In each selection circuit, one of them is selected and output, and the output of each selection circuit is input to the correlation circuit 113. The correlation circuit 113 integrates the absolute values of the differences between the corresponding pixels of both input signals, calculates the correlation evaluation value from the circuit 113, compares the correlation evaluation value with a predetermined threshold value, and finally The 3D decision signal 102 as the output of the circuit 113 is generated. The signals 601 and 102 are the signals shown in FIG. 2, and these signals are input to the selection circuit 7 shown in FIG.

The operations of the selection circuit 7 and the polarization drive circuit 8 have already been described, and will be omitted. FIG. 4 is a diagram for explaining functions and operations in the circuit shown in FIG.
In FIG. 4, the first line indicates each of the memories 105a to 105.
6 shows the timing of writing to d. The video signal of a certain odd field is written in the field memory of O ₁ at the timing of 151, the video signal of the next even field is written in the even field memory E ₁ at the timing of 152, and the video signal of the next odd field is It is written in the odd field memory O ₂ at the timing of 153, and the video signal of the next even field is written in the even field memory E ₂ at the timing of 154.

The second line is a sequence of 4: 1 interlaced video signals (that is, a video signal generated from the selection circuit 109 in FIG. 3), which corresponds to the operation of the image signal conversion circuit 6 shown in FIG. First half 153 of timing 153
The odd line number of the O ₂ memory (the second number of the subscript 11 of O ₁₁ represents the line number) is read in a, and the odd line number of the even field memory E ₂ is read in the latter half 153b of the timing 153.

The third and fourth rows are a sequence for obtaining the correlation between the odd field and the even field, which is the operation of the 3D detection circuit 1. First half 153 of timing 153
In a, the correlation between the even fields of different frames is obtained, and in the latter half 153b of the timing 153, the correlation between the odd field and the even field is obtained. 153
When the value obtained at the timing of 153b is extremely large with respect to the value obtained at the timing of a (that is, when the shift between the odd field and the even field due to the temporal change of the image is large). The 3D detection circuit 1 determines that the input video signal 101 is a stereoscopic image signal (that is, 3D) and sets the output 102 to Hi.

As described above, the 3D detection circuit provided in the image display device of the present invention detects whether or not it is a stereoscopic image signal based on the correlation calculation value based on the temporal change of the image. Therefore, highly accurate 3D determination can be performed.

<Correspondence between Invention and Embodiment> The “main display means” described in the claims corresponds to the monitor of the embodiment, and the “display assisting means” described in the claims is the glasses with shutters shown in the embodiments. 5 and polarizing plate 9 and polarizing glasses 50.

The "control means" described in the claims is the control means 10 and 11 shown in the embodiments.

The "stereoscopic image signal detecting means" described in the claims is the "3D detecting circuit 1" shown in the embodiment.

The "display control means" in the claims is a concept corresponding to each of the shutter drive circuit 3, the image signal conversion circuit 6, the selection circuit 7 and the polarization drive circuit 8 in the embodiment.

The "shading means" of claim 2 corresponds to the glasses 5 with shutters in FIG. 1, and the "shading means driving means" corresponds to the shutter driving circuit 3 of FIG.

The "first polarizing means" of claim 3 corresponds to the polarizing plate 9 of FIG. 2, and the "second polarizing means" corresponds to the polarizing glasses 50 of FIG.

The "main display means" is not limited to a CRT or a liquid crystal display device, but may be any display device of a type that inputs an interlaced video signal and alternately displays an odd field and an even field.

Of the "display assisting means", those other than those worn by the observer may be integrated with the main display means. The "control means" may be integrated with the main display means or may be a separate body. The "stereoscopic image signal detecting means" is not limited to the configuration of the embodiment.

[0053]

According to the first aspect of the present invention, the stereoscopic image signal detecting means for detecting whether or not the video signal input from the video signal source is a stereoscopic image signal is detected, and the detected result is detected. Since it is configured to change the display state of at least one of the main display means and the display auxiliary means, it is possible to clearly see both a stereoscopic image and a non-stereoscopic image.

According to the invention of claim 2, when the input video signal to the main display means is a non-stereoscopic image signal, the light-shielding means driving means simultaneously shields the light-shielding means to both eyes of the observer or simultaneously. Since the light-transmitting state is set, the observer can immediately recognize that the image on the screen of the main display means is a non-stereoscopic image depending on the state of the light-shielding means, and either observe without the light-shielding means or the light-shielding means. It is possible to select whether to observe through the means, and it is possible to see clearly even in the case of a non-stereo image.

According to the third aspect of the invention, when the video signal input from the video signal source is a non-stereo image signal, the video signal whose field frequency is increased by the image signal converting means is input to the main display means. On the other hand, since the switching frequency of the polarization direction of the first polarizing means is made the same as the field frequency of the output video signal of the image signal converting means, the non-stereoscopic image is observed on the screen of the main display means. Also, there is little flicker, and an image with high resolution can be observed.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an image display device of a first embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of an image display device of a second embodiment of the present invention.

FIG. 3 is a diagram showing a partial configuration of control means applicable to the image display device shown in FIG.

4 is a diagram for explaining a signal processing method in the configuration of FIG.

FIG. 5 is a diagram showing a schematic configuration of a conventionally known stereoscopic image display device.

FIG. 6 is a diagram showing a schematic configuration of a conventionally known stereoscopic image display device different from that of FIG.

[Explanation of symbols]

1 ... 3D (stereoscopic image signal) detection circuit 2 ... O / E (odd field / even field) separation circuit 3 ... Shutter drive circuit 4 ... Monitor 5 ... Shutter glasses 6 ... Image signal conversion circuit 7 ... Selection circuit 8 ... Polarization Drive circuit 9 ... Polarizing plate 10, 11 ... Control means 103 ... A / D converter 105a-105d ... Field memory 109-111 ... Selection circuit 112 ... D / A
Converter 113 ... Correlation evaluation means

Claims (3)

[Claims] 1. A main display means for alternately displaying an odd field and an even field on a display screen based on an interlaced video signal input from a video signal source, and observing the screen of the main display means. Display assisting means arranged between the observer and the screen to change the visual image for the observer, and display of at least one of the main display means and the display assisting means according to the type of the interlaced video signal. And a control means for changing the state, wherein the control means detects a stereoscopic image signal detecting whether the video signal is a stereoscopic image signal, and a detection result of the stereoscopic image signal detecting means. According to the display control means for changing the display state of at least one of the main display means and the display auxiliary means, and the stereoscopic image signal detecting means is an odd field of the video signal. An image display device, characterized in that a correlation evaluation means for determining a correlation between the even field and. 2. The display assisting means is configured as a light blocking means capable of separately blocking the light incident on both eyes of the observer on the left and right sides, and the display control means drives the light blocking means. The light-shielding means driving means synchronizes with each of the odd field and the even field of the screen of the main display means in accordance with the first detection result by the stereoscopic image signal detecting means. The first function of driving the light shielding means so as to alternately change the light shielding state for the left and right eyes, and the left and right sides of the observer's eyes according to the second detection result by the stereoscopic image signal detecting means. 2. The image display device according to claim 1, further comprising a second function of driving the light shielding means so as to be in a state of simultaneous light shielding or simultaneous left and right light transmission. 3. The display assisting means has a first polarizing means arranged immediately in front of the screen of the main display means, and a second polarizing means having different polarization directions for the left and right eyes of the observer. The polarization control means for changing the polarization direction of the first polarization means in synchronization with the switching between the odd field and the even field of the video signal input to the main display means. Driving means, image signal converting means for increasing the field frequency of the input video signal, and selecting either the output of the image signal converting means or the input video signal according to the detection result of the stereoscopic image signal detecting means And a video signal selecting means for inputting to the main display means, and when the output of the image signal converting means is input to the main display means, the polarization driving means controls the polarization direction of the first polarization means. The frequency of the switching operation of The image display apparatus according to claim 1, characterized in that increasing in synchronism with the field frequency of the output of the No. converting means.