JPH06141252A - Monitor device - Google Patents

Abstract

PURPOSE:To automatically and appropriately display the aspect ratio of a main screen and a slave screen independently, and to allow a user to recognize the aspect ratio, of a monitor device having a slave screen display function. CONSTITUTION:An ID signal detecting part which identifies the aspect ratio is provided in a main screen input changeover switch 3 and a slave screen input changeover switch 4 for an S video signal, and a control circuit 20 controls the timing of a synchronizing signal to a vertical deflection circuit 10, horizontal deflection circuit 11, and field memory 18, based on the detection signal. And also, the control circuit 20 drives an LED, controls a character generator 21 by the detection signal, and outputs character information to an on-screen display 22, so that the aspect ratio of a display picture can be confirmed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitor device used in a television receiver or the like, and particularly has a sub-screen display function and has a standard aspect ratio of 4: 3 and a high-definition size aspect ratio of 16: 9. The present invention relates to a monitor device capable of displaying both of the above.

[0002]

2. Description of the Related Art As a function of a monitor device used in a television receiver, a sub-screen display function (Picture In Pictu) for displaying images of a plurality of different input sources on the same screen.
re, Picture Out Picture) is known. This child screen display function is to display a single screen or a plurality of child screens at a predetermined position on the main screen by adding the child screen information to the main screen information. FIG. 6 is an explanatory diagram showing an example of a screen on which a small screen is displayed. In this case, one small screen S is displayed at the lower right position on the main screen M.
With this child screen display function, the user can simultaneously view a plurality of different images on a single monitor device.

Now, with the realization of high-definition broadcasting, devices capable of displaying an image with an aspect ratio of 16: 9 are becoming widespread even in the monitor device of a system of 525 scanning lines, and the display of these devices is becoming widespread. Screen is 16:
Since it corresponds to the aspect ratio of 9, it has a so-called wide screen having a larger width ratio than the screen corresponding to the standard aspect ratio of 4: 3.

In response to this, in addition to the standard aspect ratio of 4: 3, the aspect ratio of HDTV size 16: 9 is becoming more and more mixed. , 16: 9 such as Vista size and Cinesco size are included in some video software such as movies.
Many of them have an aspect ratio similar to, and it is preferable for these sources to display an image with an aspect ratio of 16: 9 from the viewpoint of realism and the like.

As described above, in the current monitor device, there is a situation in which at least two display systems having aspect ratios of 16: 9 and 4: 3 are mixed.

In response to such a current situation, there is a monitor device having a wide screen capable of supporting both video sources having an aspect ratio of 16: 9 and 4: 3 and capable of displaying a multi-screen such as a sub-screen. It is becoming popular.

[0007]

By the way, as described above, there are a plurality of aspect ratios for each video source. Therefore, it has a sub-screen display function and is 16: 9 and 4: 3.
In a monitor device that is compatible with both aspect ratios, the main screen and the sub screen may naturally have different aspect ratios.

Conventionally, however, the output timing for inserting the small screen into the main screen is fixed, so that the aspect ratio of the small screen image follows the aspect ratio of the main screen image even if it is different from the main screen image.

In FIGS. 6 and 7, a video source having an aspect ratio of 16: 9 or 4: 3 is displayed on a main screen M and a sub-screen S of a monitor device having a wide screen corresponding to an aspect ratio of 16: 9. It is explanatory drawing which shows the state at the time of.

For example, when the aspect ratio of the main screen M and the sub-screen S at the time of input is 4: 3 as shown in the explanatory views of FIGS. 6A and 6B, or both are 16: 9. If they are the same, the small screen S is displayed on the screen with an appropriate aspect ratio, and there is no problem. The shaded portion in FIG. 6A is a non-image portion that occurs when a video image with an aspect ratio of 4: 3 is displayed on a screen corresponding to the aspect ratio of 16: 9.

However, as shown in FIG. 7A (the shaded portion is a non-image portion), the aspect ratio of the main screen M at the time of input is 4: 3, and the aspect ratio of the small screen S is 16: 9. In this case, the aspect ratio of the main screen M is 4: 3, and the aspect ratio of the sub-screen S is also displayed at 4: 3, which may cause an inconvenience that the proper proper image state is not displayed on the sub-screen S. .

Alternatively, as shown in FIG. 7B, even if the aspect ratio of the main screen M at the time of input is 16: 9 and the aspect ratio of the sub-screen S is 4: 3, the sub-screen S is Since it is displayed according to the aspect ratio of 16: 9,
Similarly, there may be a case where a proper image state cannot be obtained.

Further, in the situation as shown in FIG. 7A, for example, the correct display on the sub-screen S is 16: 9.
A video source with a 4: 3 aspect ratio is assumed to be a video source with a 4: 3 aspect ratio without the user noticing it.
A situation in which a TR device or the like has been recorded, and when it is reproduced by a monitor device that supports only an aspect ratio of 4: 3, it becomes an elongated image compressed in the lateral direction. Can also occur.

Therefore, when the aspect ratio of the small screen is different from the aspect ratio of the main screen and a problem such that an appropriate image is not displayed occurs, there is a monitor device configured not to display the small screen at all. As is known, this does not mean that the child screen display function is effectively used.

In such a situation in which a plurality of aspect ratios exist, the present system of the monitor device cannot deal with these various problems, and it confuses the user.

[0016]

In order to solve the above problems, the present invention solves the above-mentioned problems by selecting means capable of selecting video signals from a plurality of built-in or separate input sources, and the selecting means. More than one selected video signal,
In a monitor device having display means capable of displaying on the same screen as a multi-video screen, detection means for detecting an aspect ratio identification signal superposed on the video signal by a predetermined method is provided according to the number of multi-video screens. ,
Based on the aspect ratio identification signal detected by the detection means, a control means for controlling so as to properly display the aspect ratio of each multi-video screen is provided.

The video signal from the input source is at least the S video signal or the composite video signal.

Further, an information display means for displaying predetermined information on the screen is provided, and the control means appropriately sets the aspect ratio of each multi-video screen on the basis of the aspect ratio identification signal detected by the detection means. In addition to displaying, the information display means is configured to control the aspect ratio information of each multi-video screen to be displayed on the screen.

Further, an information display device for displaying the information of the aspect ratio of each multi-video screen, which operates in response to the output of the aspect ratio identification signal detected by the detecting means, is also provided.

[0020]

It has been implemented or proposed to superimpose additional information such as the aspect ratio identification signal on the S video signal or the composite video signal according to a predetermined method.
In a television receiver with a child screen display function,
According to the number of multi-screens, a means for detecting the aspect ratio identification signals of the video sources of both the main screen and the sub-screen is provided, and the aspect ratio of the sub-screen as well as the main screen is determined based on the aspect ratio determined by the detection means. By configuring the control means so that the ratio can also be displayed properly, the small screen display is always performed properly.

Further, the aspect ratios of the video sources of the main screen and the sub-screen displayed on the screen are displayed on the screen.
Alternatively, by providing the monitor device with a display device that operates based on the output of the aspect ratio identification signal, the user can
It is possible to confirm the aspect ratio of the image currently displayed.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method is known in which a DC voltage of a predetermined level is superimposed on a chroma signal of an S video signal as a signal for video additional information (hereinafter referred to as an ID signal). This I
An aspect ratio identification signal is standardized as the D signal, and the monitor device side has a discrimination function corresponding to this ID signal so that the aspect ratio of the source of the S video having the ID signal is 4: 3. Alternatively, it is possible to determine whether it is 16: 9.

In the embodiment described below,
A plurality of the aspect ratio identifying means are provided for the main screen and the child screen so that the S image can be displayed with an appropriate aspect ratio when the S image is displayed on the child screen as well as the main screen. .

The block circuit diagram of FIG. 1 shows an embodiment of the monitor device according to the present invention. CI _{1 to} CI ₄
Are input terminals for composite video signals, and four are provided in this embodiment. The number of these input terminals can of course be changed. These terminals are connected to the main screen input changeover switch 1 and the sub screen input changeover switch 2, respectively. On the other hand, SI _{1 to} SI ₄
Is an S video signal input terminal, and like the composite video signal input terminal, four terminals are provided and
All terminals are connected to the main screen input changeover switch 3 and the sub-screen input changeover switch 4, respectively.
In addition, a video signal in which a luminance signal (hereinafter, referred to as Y signal) and a chroma signal (hereinafter, referred to as C signal) are independent from each other is S
It is called a video signal.

Reference numeral 5 is a Y / C separation circuit for the main screen, 6 is a composite / S video signal selector switch for switching between a composite video signal and an S video signal to be displayed on the main screen, and 7 is a C signal. A chroma decoder for converting the Y and Y signals into R, G, B signals, and an RGB amplifier for amplifying the R, G, B signals and outputting them to the electron gun of the CRT 14. Reference numeral 9 is a sync separation circuit for separating the vertical and horizontal sync signals from the Y signal for the main screen, 10 is a vertical deflection circuit which obtains a vertical deflection current from the vertical sync signal and supplies it to the vertical deflection coil 12, and 11 is a horizontal deflection circuit. A horizontal deflection circuit that obtains a horizontal deflection current from the synchronization signal and supplies the horizontal deflection current to the horizontal deflection coil 13 is a synchronization separation circuit 19 that extracts vertical and horizontal synchronization signals from the Y signal for the child screen.

Reference numeral 15 is a Y / C provided for a child screen.
Reference numeral 16 is a separation circuit, and 16 is a composite / S that switches between a composite video signal and an S video signal to be displayed on a sub-screen.
A video signal changeover switch, 17 is a chroma decoder for obtaining R, G, B signals from the C signal and Y signal, and 18 is a field memory for taking in the R, G, B signals obtained by the chroma decoder 17 as image data for one field. Is.

Further, 20 is a control circuit for performing various controls of the monitor device, 21 is a character generator for outputting information signals such as characters and symbols, and 22 is an information signal obtained from the character generator 21 for R and G. ,
It is an on-screen display that outputs to the RGB amplifier 8 as a B signal.

Since the resistors R ₁ and R ₂ and the light emitting diodes L ₁ and L ₂ will be described later, the description thereof will be omitted here.

The composite video signals connected to the input terminals CI _{1 to} CI ₄ are input to the main screen input changeover switch 1 and the small screen input changeover switch 2, respectively. Also,
The S video signals connected to the input terminals SI _{1 to} SI ₄ are input to the main screen input selector switch 3 and the sub-screen input selector switch 4
Are input respectively.

Next, the user operates the operation unit 23,
Alternatively, according to the information detected by the light receiving unit 24 when the operation of an external remote control (remote control) device (not shown) is performed, the control circuit 20 controls the input designated by the main screen input changeover switches 1 and 3 and the child screen input changeover switches 2 and 4. Switch the switch according to the source to select the video source to be displayed on the main screen and the sub screen.

Then, the composite video signal switched by the main screen input changeover switch 1 is output to the main screen Y / C separation circuit 5 to be separated into a Y signal and a C signal, and then the main screen use signal. It is input to the composite / S-video signal changeover switch 6.

The composite video signal switched by the small screen input selector switch 2 is output to the small screen Y / C separation circuit 15 to be separated into the Y signal and the C signal.
Composite / S-video signal changeover switch 1 for child screen
6 is input.

Further, the S video signal switched by the main screen input selector switch 3 is switched to the composite / S video signal selector switch 6 for the main screen, and the S video signal switched by the slave screen input selector switch 4 is the slave screen. Composite S
It is input to the video signal changeover switch 16.

The main screen input changeover switch 3 and the small screen input changeover switch 4 on the S video signal side extract an ID signal from the C signal of the S video signal, and use this as an aspect ratio identification signal A and B as a control circuit. Outputting to 20 is also performed, which will be described later.

Next, in the composite / S video signal change-over switch 6 for the main screen, the input composite video signal and the S video signal are controlled by the control signal output from the control circuit 20.
The video signal is switched. Similarly, the composite / S-video signal changeover switch 16 for the sub-screen also switches the input composite video signal and S-video signal.

Thereafter, the C and Y signals of the video source switched by the composite / S video signal selector switch 6 for the main screen are converted into R, G, and R by the chroma decoder 7 for the main screen.
It is converted into a B signal and output to the RGB amplifier 8.

On the other hand, the C of the video source switched by the composite / S video signal selector switch 16 for the sub-screen.
The signal and the Y signal are output to the chroma decoder 17 for the child screen, and the Y signal is also output to the sync separation circuit 19.

Next, the C and Y signals input to the sub-frame chroma decoder 17 are converted into R, G, and B signals here, and then the vertical and horizontal synchronization signals output from the sync separation circuit 19 are output. Field memory 18 according to the timing of
Are sequentially captured as data for one field. Then, the data written in the field memory 18 is output to the RGB amplifier 8 based on the synchronization timing corresponding to the position where the child screen is displayed on the screen, and here, from the main screen and the on-screen display 22. R of
It will be combined with the G and B signals.

The R, G, B signals synthesized by the RGB amplifier 8 are output to the CRT 14 and driven as R, G, B electron beams, respectively. At this time, the vertical deflection current and the horizontal deflection current output from the vertical deflection circuit 10 and the horizontal deflection circuit 11 are supplied to the vertical deflection coil and the horizontal deflection coil, respectively, so that a raster image is displayed on the screen of the CRT 14. Will be done.

Next, the aspect ratio switching control at the time of displaying the S video signal, which is a feature of this embodiment, will be described.

As shown in the figure, in the main screen input changeover switch 3 and the small screen input changeover switch 4 on the S video signal side,
The C signal and the Y signal of the S image are output, the ID signal is detected from the C signal, and this is output to the control circuit 20 as the aspect ratio identification signal A.

The interiors of the main screen input changeover switch 3 and the sub-screen input changeover switch 4 are composed of a Y signal changeover section, a C signal changeover section and an ID signal detection section. The circuit diagram of FIG. 2 shows the C signal switching section and the ID signal detecting section of the input changeover switches 3 and 4, and SC ₁ to SC ₄ shown in the figure.
Is a C signal input section and S video signal input terminals SI _{1 to} S 1 of FIG.
It corresponds to I ₄ , respectively. Further, C _{1 to} C ₄ are coupling capacitors, R _{11 to} R ₁₄ are AC terminating resistors for impedance matching, SW ₁ is a C signal switch unit, and a S signal desired by the user is output according to an output from the control circuit 20. The signal is switched to the C signal corresponding to the video source. Further, F _{1 to} F ₄ are low-pass filters for removing high frequency components, A _{1 to} A ₄ are comparators, SW ₂ is an aspect ratio identification signal corresponding to the C signal of the S video source switched by the C signal switch unit SW _1. It is an aspect ratio identification signal switch unit for switching between. R _{15 to} R ₁₈ are DC terminating resistors for impedance matching, E _{1 to} E ₄
Is a power supply unit that outputs a comparison voltage of a predetermined level to the inverting input of each comparator.

Here, the C signal switch unit SW _{1 of} FIG.
The aspect ratio identification signal switch section SW ₂ corresponds to the C signal input section SC ₁ , and the switch a shown in FIG.
And b.

At this time, the C signal, which is input to the C signal input section SC ₁ and on which the ID signal for identifying the aspect ratio is superimposed, passes through the coupling capacitor C ₁ to generate an ID signal component which is a DC voltage. Is removed and impedance-matched by the AC terminating resistor R ₁₁ , and then input to the C signal switch unit SW ₁ . And C of S image
As a signal, a composite / S video signal changeover switch 6 (when the circuit of FIG. 2 is inside the main screen input changeover switch 3) or 16 (when the circuit of FIG. 2 is inside the sub-screen input changeover switch 4) Is output to.

The C signal on which the ID signal is superimposed without passing through the coupling capacitor C ₁ is a DC terminating resistor R ₁₅
The impedance of the ID signal component is matched by and the C signal which is a high frequency component is removed by passing through the low-pass filter F ₁ and only the ID signal of the DC voltage is taken out, and then the non-inverting input of the comparator A ₁ is inputted. It is supposed to be entered. And this comparator A ₁
Then, the voltage level of the ID signal input to the non-inverting input is detected using the comparison voltage input to the inverting input, and the aspect ratio identification signal A corresponding to this is detected via the aspect ratio identification signal switch unit SW _2. It will be output to the control circuit 20.

The signal path described above is the C signal switch section SW.
₁ and an aspect ratio identification signal switch unit SW ₂ is omitted because it is similar even when being switched in response to any of the C signal inputted to the C signal input SC ₂ to SC _4.

Based on the above description, the user operates the operation unit 23 or the external remote controller to select the video source connected to the S video signal input terminal SI ₁ of FIG. 1 as the video source to be displayed on the main screen. Also, as the video source to be displayed on the sub-screen, the S video signal input terminal SI
A case in which one connected to ₂ is selected, that is, a case where the S video source is displayed on both the main screen and the sub screen will be described. It is assumed that ID signals for identifying the aspect ratio are superimposed on the C signals of both S video sources.

In this case, the main screen input selector switch 3 outputs the C and Y signals of the S video source connected to the S video signal input terminal SI ₁ to the composite / S video signal selector switch 6, and C as above
The aspect ratio identification signal A detected from the signal is output to the control circuit 20.

From the small screen input selector switch 4,
The C signal and Y signal of the S video source connected to the S video signal input terminal SI ₂ are output to the composite / S video signal changeover switch 16 for the sub-screen, and the aspect ratio identification signal B detected from the C signal Is output to the control circuit 20.

At this time, if the composite / S-video signal changeover switch 6 is switched to the composite video signal side, it is switched to the S-video signal side under the control of the control circuit 20, and the C-signal of the S-video signal and The Y signal is supplied as R, G, B signals for the main screen through the chroma decoder 7
It is supplied to the GB amplifier 8.

Also, in the composite / S-video signal changeover switch 16 for the sub-screen, if it is switched to the composite video signal, it is switched to the S-video signal side under the control of the control circuit 20 and the S-video signal The C signal and the Y signal are supplied to the R, G and B signals via the chroma decoder 17.
After being converted into a signal, it is output to the field memory 18, and the Y signal is also output to the sync separation circuit 19.

For the field memory 18, the control circuit 20 outputs the aspect ratio switching signal D corresponding to the aspect ratio determined based on the aspect ratio identification signal B, and the sync separation circuit 19 outputs the vertical sync signal V. And the horizontal synchronizing signal H is output.

Then, the field memory 18 stores the data for one field of the sub-screen, which is sequentially RG.
It is output to the B amplifier 8. At this time, the output timings of the vertical synchronizing signal V and the horizontal synchronizing signal H are controlled by the aspect ratio switching signal D so that an appropriate aspect ratio can be obtained at the time of displaying the small screen, and the R, G, and B signals are stored and output. Will be performed.

Therefore, the image data of the small screen is output to the RGB amplifier 8 without being influenced by the aspect ratio of the main screen and is combined with the R, G, B signals of the main screen. Become.

Next, the R, G, B signals of the main screen and the R, G, B signals of the sub-screen combined by the RGB amplifier 8 are CR.
It is output to T14 and driven as an electron beam. At this time, the control circuit 20 determines the aspect ratio based on the aspect ratio identification signal A, and outputs the aspect ratio switching signal C corresponding to this aspect ratio to the vertical deflection coil 10 and the horizontal deflection coil 11. By the aspect ratio switching signal C, each of the vertical deflection current generated by the vertical deflection coil 10 and the horizontal deflection current generated by the horizontal deflection coil 11 is adjusted so that the main screen has the aspect ratio determined by the control circuit 20. Since the output timing of is controlled, the aspect ratio of the main screen is properly displayed on the screen.
At this time, the child screen displayed together with the main screen is also processed in the field memory 18 at the synchronization timing according to the correct aspect ratio as described above, so that the aspect ratio is naturally displayed properly. It will be.

FIGS. 4A and 4B are explanatory views showing the display screen of the monitor device in the present embodiment. As shown in the figure, the display screen of this monitor device has an aspect ratio of 16: 9. It is a wide screen compatible with.

FIG. 4A shows the case where S image sources having different aspect ratios of 16: 9 on the main screen M and 4: 3 on the sub screen S are input. Conventionally, in such a case, as shown in FIG.
According to the aspect ratio of 6: 9, the sub-screen S is also 16 :.
It was displayed with an aspect ratio of 9. However, in this embodiment, the aspect ratio of the main screen M is displayed at 16: 9 by the aspect ratio switching signal C, and the small screen S is also displayed at the aspect ratio controlled by the aspect ratio switching signal D. Since it is processed as described above, an appropriate sub-screen display is performed with an aspect ratio of 4: 3 without being affected by the aspect ratio 16: 9 of the main screen.

On the other hand, in FIG. 4B, the main screen M is 4: 3,
The sub-screen S shows a display screen when S video sources having an aspect ratio of 16: 9 are input. Even in such a case, conventionally, as shown in FIG.
The aspect ratio of was displayed as 4: 3 following the main screen, but in the present embodiment, the main screen M is displayed as in FIG. 5A.
The sub-screen S is properly displayed with an aspect ratio of 16: 9 regardless of the aspect ratio of.

As described above, in this embodiment, when the video source to be displayed is the S video signal and the ID signal for identifying the aspect ratio is superimposed on the C signal of the S video signal, the Not only the screen but also the sub screen does not follow the aspect ratio of the main screen, and it is possible to automatically display an image with an appropriate aspect ratio.

In this embodiment, it is impossible to automatically control the aspect ratio in the case of a composite video source, but the control circuit 20 and others are configured to manually switch the aspect ratio for these sources. Of course, although not shown, the composite video source is input to the main screen, and the S video signal on which the ID signal is superimposed is input to the sub screen. It is needless to say that the aspect ratio of the sub screen is properly displayed regardless of the main screen because the aspect ratio of the sub screen is controlled.

Further, in the present embodiment, a light emitting diode or the like is provided in the main body of the monitor device as a display unit, and these are driven by the aspect ratio identification signals A and B, and the screen showing the aspect ratio is also displayed, so that the present screen is displayed. The user can check the aspect ratio of the main screen and the sub screen displayed on the.

As shown in FIG. 1, the aspect ratio identification signal A output from the main screen input changeover switch 3 is input to the control circuit 20 and at the same time a constant current is supplied via the resistor R _1, and then the light is emitted. It is adapted to be applied to the diode L ₁ . However, since the voltage level of the aspect ratio identification signal A differs depending on the aspect ratio, the light emitting diode L ₁ has the aspect ratio identification signal A of a predetermined aspect ratio.
Will be driven when is supplied.

[0063] Also, with regard the aspect ratio of the S-video source to be displayed on the child screen, the configuration similar to the above, based on the aspect ratio identification signal B, the aspect ratio light emitting diode L ₂ is given through a resistor R ₂ Drive corresponding to.

In this way, the light emitting diodes L ₁ and L
_{Since the} display part consisting of ₂ lights according to the aspect ratio of the video source displayed on the screen, the user can check the aspect ratio of the main screen and the sub screen currently displayed on the screen. Become.

Further, the control circuit 20 determines the character generator 21 from the information of the aspect ratios of the main screen and the child screen which are discriminated based on the aspect ratio identification signals A and B.
Is controlled to output characters or symbol information indicating the aspect ratio of the main screen and the child screen from here. Then, the character or symbol data is output from the on-screen display 22 as R, G, B signals at a predetermined timing and is combined by the RGB amplifier 8 to generate the main screen and the current screen currently displayed on the screen. Since the information of the aspect ratio of the small screen is displayed at a predetermined position on the screen, the user can check the aspect ratio of the S video source from these displays on the screen.

It should be noted that the characters and symbols displayed on the screen are not limited to those indicating the aspect ratio, and naturally various kinds of information regarding the others can also be displayed.
The display position, display period, display timing, and the like of these characters and symbols can be arbitrarily set.

With this configuration, the user can check the aspect ratios of the main screen and the child screens displayed on the screen. In particular, as shown in the explanatory diagram of FIG. 5, A video source having an aspect ratio of 4: 3 is displayed by overscanning the upper and lower parts of the image so that there are no image portions on the left and right sides of the display screen P having an aspect ratio of 16: 9 (overscan portion Q Is indicated by a one-dot chain line), and it may be difficult to specify the aspect ratio only by looking at the image, which is useful.

Next, another embodiment of the present invention will be described. Currently, luminance signal (Y signal) of composite video signal
It is performed to superimpose and transmit a character multiplex signal or the like on a predetermined line in the vertical blanking period of, and like this character multiplex signal, an ID including an aspect ratio identification signal is used.
It is known that the signal is also coded and superposed on a predetermined line of the vertical blanking period of the luminance signal (Y signal) of the composite video signal (hereinafter, this ID signal is referred to as V
BID). Therefore, in the present embodiment, by utilizing this VBID, not only the S video source but also the source of the composite video signal is automatically switched in the aspect ratio and displayed on the main screen or the sub screen.

FIG. 3 is a block circuit diagram of this embodiment.
30 is the VBID detection unit for the main screen, 31 is the VBID for the sub screen
BID detectors, L ₃ and L ₄ are light emitting diodes provided as a display unit in the main body of the monitor device, and R ₃ and R ₄ are resistors. The same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, the VBID detection section 30 for the main screen is connected to the Y signal output of the composite / S terminal changeover switch section 3 for the main screen. Here, it is assumed that the composite video signal is switched by the composite / S terminal changeover switch unit 3 for the main screen and the Y signal on which VBID is superimposed is output to the VBID detection unit 30. Then, the VBID detection unit 30 outputs the aspect ratio identification signal E to the control circuit 20 based on the VBID for aspect ratio identification detected from the input Y signal. Further, the aspect ratio identification signal E is the resistance R
_Since the light is also output to the light emitting diode L ₃ via the light emitting diode ₃ , the light emitting diode L ₃ is lit corresponding to a predetermined aspect ratio, and the aspect ratio confirmation display is performed, as in the case of the light emitting diode in the case of FIG. Be seen. Then, the Y signal from which VBID has been removed is output to the chroma decoder 7 and the sync separation circuit 11.

Next, the input aspect ratio identification signal E
Thus, the control circuit 20 determines the aspect ratio of the video source to be displayed on the main screen. Then, the aspect ratio switching signal C corresponding to the determined aspect ratio is output to the vertical and horizontal deflection circuits 10 and 11, and the vertical and horizontal deflection currents are output so that the main screen is displayed with an appropriate aspect ratio. Timing will be controlled.

On the other hand, when the Y signal on which the VBID is superimposed is input to the VBID detection unit 31 for the small screen, the VBID detection unit 31 detects the VBID from the input Y signal. Then, the aspect ratio identification signal F is output to the control circuit 20.

Since the aspect ratio identification signal F is also output to the light emitting diode L ₄ via the resistor R ₄ , the light emitting diode L ₄ has the aspect ratio of the sub-screen as in the case of the light emitting diode L _3. Display the confirmation of the ratio. Further, the Y signal from which the VBID has been removed by the VBID detector 31 is output to the chroma decoder 17 and the sync separation circuit 19.

Here, the control circuit 20 determines the aspect ratio of the video source to be displayed on the small screen from the input aspect ratio identification signal F. Then, the aspect ratio switching signal D corresponding to the determined aspect ratio is output to the field memory 18, and the vertical synchronizing signal V and the horizontal synchronizing signal H, and the vertical synchronizing signal V are output so that the child screen display is performed at the determined aspect ratio. The output timing to the RGB amplifier 8 will be controlled.

Also in this case, as in the embodiment of FIG.
The control circuit 20 can cause the character generator 21 to output a character or symbol information indicating the aspect ratio according to the control signals based on the aspect ratio identification signals E and F. Then, these data are combined as R, G, and B signals by the RGB amplifier 8 via the on-screen display 22, so that the aspect ratio can be displayed on the screen.

With the above configuration, in the present embodiment, if the S signal and the composite image source are overlapped with the ID signal, the ID signal can be detected and the aspect ratio can be determined. Not only can the child screen be automatically switched to an appropriate aspect ratio for display, but also the aspect ratio of the displayed image can be confirmed by a display device such as an LED or a screen display of character information.

That is, when the composite video source is displayed on the main screen and the S video source is displayed on the sub screen, and the aspect ratios of these are different, or conversely, the S video source is displayed on the main screen and the sub screen is displayed on the sub screen. Even when a composite video source is displayed and the aspect ratios are different, not only the main screen is displayed with an appropriate aspect ratio, but the sub-screen is also affected by the aspect ratio of the main screen. Instead, it will be displayed with an appropriate aspect ratio. Further, in FIG. 1, the display of the aspect ratio by the LED, the character and the like is only for the S video, but in the present embodiment, the display of the aspect ratio is also performed for the composite video.

Although the monitor device capable of displaying one child screen is mentioned as each of the above-described embodiments, the present invention can be applied to a monitor device capable of displaying a plurality of child screens. Needless to say.

[0079]

As described above, according to the present invention, the detectors for detecting the ID signal for identifying the aspect ratio superimposed on the S video signal and the composite video signal are provided for the main screen display and the child screen display, respectively. Correspondingly, by configuring the control circuit etc. to properly display the aspect ratio of the main screen and the child screen based on these aspect ratio identification signals, it is not necessary to follow the aspect ratio of the main screen as in the past. , It is possible to always display the sub-screen automatically with the proper aspect ratio.

Further, it is configured to display characters and symbols indicating the aspect ratio of the main screen and the sub-screen on the screen, or an LED or the like is provided as a display device in the monitor device main body.
By performing light emission display corresponding to the aspect ratio identification signal, the user can check the aspect ratio of each video source currently displayed on the screen.
Due to this, for example, when the user records some kind of video source, there is a problem that a VTR device or the like that does not support the aspect ratio of the video source is mistakenly used and recording is performed with this. Can be prevented.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of a monitor device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of an S video chroma signal switching unit and an aspect ratio identification signal switching unit according to an embodiment of the present invention.

FIG. 3 is a block circuit diagram of a monitor device according to another embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a display state of an image according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a display state of an image in the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a display state of an image in a conventional example.

FIG. 7 is an explanatory diagram showing a display state of an image in a conventional example.

[Explanation of symbols]

3 Main screen input selector switch 4 Sub screen input selector switch 20 Control circuit 21 Character generator 22 On-screen display 30, 31 VBID detector A, B, E, F Aspect ratio identification signal C, D Aspect ratio switching signal L ₁ , L ₂ , L ₃ , L ₄ light emitting diode

Claims (4)

[Claims] 1. A selection unit capable of selecting video signals from a plurality of input sources, which are built-in or separate, and a plurality of the video signals selected by the selection unit, as a multi-screen image on the same screen. In a monitor device having a display means capable of displaying on the above, a detection means for detecting an aspect ratio identification signal superimposed on the video signal by a predetermined method is provided according to the number of multi-video screens, and the detection means detects the detection result. A monitor device provided with control means for controlling to properly display the aspect ratio of each of the multiple video screens based on the aspect ratio identification signal. 2. The monitor device according to claim 1, wherein the video signal is at least an S video signal or a composite video signal. 3. An information display means for displaying predetermined information on a screen is provided, and the control means determines an aspect ratio of each of the multi-video screens based on an aspect ratio identification signal detected by the detection means. The monitor device according to claim 1 or 2, wherein the information display means is controlled to display the aspect ratio information of each of the multi-video screens on the screen while displaying the information properly. 4. An information display device is provided, which operates in response to the output of the aspect ratio identification signal detected by the detection means, and displays the information of the aspect ratio of each of the multiple video screens. Claim 1 and Claim 2
And the monitor device according to claim 3.