JPH11220676A - Multi-screen television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display the whole scanning line of a wide video without distortion, and to display another video in the margin. SOLUTION: A video signal is applied to an N/MfH horizontal synchronization generating part 26, and a horizontal synchronizing signal with frequencies which are N/M times as high as the horizontal frequencies fH of the video signal is generated. A main video time axis compressing part 22 compress the time base of the inputted video signal by using the horizontal synchronizing signal. On the other hand, another video generating part 25 generates a prescribed another video. A main videos signal and another video signal are switched and selected by a superimposing part 23, and supplied to a video display part 24. The deflection of the video display part 24 is controlled by a deflection processing part 28 so that the whole scanning lines of the main video can be displayed without any distortion, and another video can be displayed in an area except for the main video.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-screen television receiver for displaying a main picture and another picture on a multi-screen.

[0002]

2. Description of the Related Art In recent years, a wide aspect television receiver (hereinafter, referred to as a wide television receiver) having a 16: 9 aspect ratio of a screen has become widespread in order to enable viewing of a program full of a sense of reality. doing. The aspect ratio of wide TV receivers is HDTV (High Defini
Option TV) Broadcast and 2nd Generation EDTV (Extended Defi
nition TV) Same as the aspect ratio of the broadcast. Wide television receivers also typically have a tuner that receives current terrestrial broadcasts with an aspect ratio of 4: 3. Furthermore, in response to demands for higher functionality, wide-screen television receivers have been equipped with satellite broadcast reception tuners,
A teletext tuner, a MUSE broadcast receiving decoder, and the like are also incorporated.

[0003] A two-screen display function for simultaneously displaying desired two-channel images among a plurality of video signals from the plurality of tuners and a plurality of external video signals input through the external signal input terminal is added. Wide TV receivers have also been commercialized.

FIG. 11 is a block diagram showing a conventional multi-screen television receiver having such a two-screen projection function.

[0005] A main video signal for a main video is input to an input terminal 11, and a sub video signal for a sub video is input to an input terminal 12. The main video signal is converted into a digital signal by the A / D converter 1 and supplied to the horizontal compression unit 2. The main video signal is also supplied to the synchronization processing unit 10, which separates the horizontal synchronization signal (H) and the vertical synchronization signal (V) from the main video signal and outputs them to the deflection processing unit 16 and the horizontal compression unit 2. I do.

The horizontal compression section 2 has, for example, a line memory, and compresses the input main video signal in the horizontal direction to １ ／ and outputs it to the D / A converter 3. The main video signal that has been horizontally compressed by １ ／ is returned to an analog signal by the D / A converter 3 and supplied to the superimposing unit 4.

On the other hand, the sub-picture signal input via the input terminal 12 is converted into a digital signal by the A / D converter 5 and supplied to the timing processing unit 6. The sub-picture signal is also supplied to the synchronization processing unit 14, and the synchronization processing unit 14 separates the horizontal and vertical synchronization signals from the sub-picture signal and supplies the separated signals to the timing processing unit 6.

The timing processing section 6 creates a sub-picture signal for a sub-picture from the input sub-picture signal using the memory 9. The write clock generator 7 generates a write clock WCK synchronized with the horizontal and vertical synchronizing signals of the sub-image, and supplies the write clock WCK to the timing processor 6. The timing processor 6 writes the input sub-video signal into the memory 9 using the write clock WCK.

The timing processor 6 is also provided with horizontal and vertical synchronization signals separated from the main video signal. The read clock generator 8 generates a read clock RCK having a frequency twice as high as the write clock WCK in synchronization with the horizontal and vertical synchronization signals of the main video, and outputs the generated read clock RCK to the timing processor 6. The timing processing section 6 reads the sub-picture signal stored in the memory 9 at a timing corresponding to the latter half of the main picture in the horizontal direction using the read clock RCK.

In this case, since the frequency of the read clock RCK is twice the frequency of the write clock WCK, the sub-picture signal output from the timing processing section 6 is compressed to 水平 in the horizontal direction. Timing processing unit 6
The sub-picture signal from is converted into an analog signal by the D / A converter 13 and then supplied to the superimposing unit 4.

The switching of the superposition section 4 is controlled by a timing processing section 6. The timing processing unit 6 supplies a timing signal indicating the main video display period and the sub video display period to the superimposition unit 4. The superimposing unit 4 outputs the main video signal from the D / A converter 3 when the main video display period is specified by the timing signal, and outputs the main video signal from the D / A converter 13 when the sub-image display period is specified. Outputs a sub video signal.

The output of the superposition section 4 is supplied to a video display section 15. The deflection of the image display unit 15 is controlled by the deflection processing unit 16, and the image display unit 15 displays an image based on the input main and sub image signals. Accordingly, on the display screen of the video display unit 15, the main video is displayed in the main video area on the left side of the screen, and the sub video based on the sub video signal is displayed in the sub video area on the right side of the screen instead of the main video. You.

As described above, in the apparatus shown in FIG. 11, the main video and the sub video can be displayed side by side on the screen. In this case, a screen having a wide aspect ratio (aspect ratio) is used as the image display unit 15 (hereinafter, referred to as a wide screen).
, It is possible to make the two-screen display easier to see.

FIG. 12 is an explanatory diagram showing an example in which a main image and a sub-image having an aspect ratio of 4: 3 are displayed on a wide screen having an aspect ratio of 16: 9.

In FIG. 12, a main image 19 is displayed on the left side of the wide screen 18 and a sub image 20 is displayed on the right side. The upper and lower parts of the wide screen 18 are the main image 19 and the sub image
20 is the margin 17 where no display is made. As described above, when a two-screen display is performed, if a wide screen is used, a main image and a sub-image can be effectively projected on a relatively large screen without causing image loss.

However, the image display unit 15 has an aspect ratio of NT.
In many cases, the one corresponding to the SC system is adopted. In this case, in order to display the main image and the sub-image having the aspect ratio of 4: 3 without distortion, it is necessary to make the margins at the top and bottom of the screen relatively wide, and to make the margin relatively narrow. Then, the main video and the sub video become vertically distorted images.

Further, an aspect ratio of 1 is displayed on a screen having an aspect ratio of 4 to 3.
It is also conceivable to display a 6: 9 wide image on multiple screens. In this case, it is effective to display the sub-pictures above and below the main picture, that is, the wide picture, but the margin where the picture is not displayed becomes wider, and if the margin is reduced, the distortion of the picture will be reduced. It gets bigger.

It is considered that the number of broadcast or video sources in which the aspect ratio of the main video is 16: 9 will be more and more in addition to the current high-definition broadcast. However, as described above, when an image having an aspect ratio of 4: 3 is displayed on a multi-screen as a main image, the distortion or margin is relatively small.
In a case where an image having an aspect ratio of 16: 9 is displayed on a multi-screen as a main image, it is necessary to relatively increase the distortion or the margin. In the picture-in-picture display in which the sub-picture is displayed so as to be superimposed on a part of the main picture, there is a disadvantage that information of the main picture is lost.

Therefore, Japanese Patent Application Laid-Open No. Hei 4-316288,
JP-A-3-66274 and JP-A-2-65576
Japanese Patent Laid-Open Publication No. H11-15064 proposes a method of maintaining the aspect ratio of a main image at 16: 9 and displaying another image in a margin generated at an upper portion or a lower portion of a screen.

That is, in these proposals, the current NT
In order to display a high-definition broadcast such as a high-vision broadcast having an aspect ratio of 16 to 9 using a television receiver compatible with the SC system, a MUSE-NTSC converter (hereinafter referred to as M
N converter). The MN converter down-converts the HDTV broadcast signal to the signal of the current NTSC system, and at the same time, makes the number of effective scanning lines in the vertical direction of the video 3/4 times that of the video signal of the current NTSC system. When this video signal is displayed on a display device having an aspect ratio of 4: 3, an HDTV video having a correct roundness can be displayed.

However, in this case, the number of effective scanning lines of the HDTV video displayed as the main video is
This is ３ of the system, and the information of the main video is significantly impaired. That is, when the video signal to be transmitted is a signal that uses 3/4 of the effective scanning line of the current NTSC system, such as a video signal of the second generation EDTV system, a main signal based on this signal is used. The video can be displayed without loss of information. However, as for the HDTV signal, the video signal transmitted using all the available transmission lines (so-called compression mode video signal) is used. The main video based on this signal loses information due to multi-screen display.

[0022]

As described above, in the above-described conventional multi-screen television receiver, it is possible to effectively display a multi-screen with a wide image having an aspect ratio of 16: 9 as a main image. In addition, there is a problem that the wide image cannot be displayed as a main image on a multi-screen without losing information of a video signal in a compression mode of the wide image.

The present invention has been made in view of such a problem, and even when a wide image in a compression mode is input, the wide image can be displayed as a main image on a multi-screen without losing information. It is an object of the present invention to provide a multi-screen television receiver that can perform the operation.

Further, the present invention provides a multi-screen television receiver capable of displaying a wide image as a main image and effectively displaying another image in a margin thereof even when a wide image is input. The purpose is to do.

Another object of the present invention is to provide a multi-screen television receiver capable of improving the visibility of the main image when performing multi-screen display using a wide image as the main image.

[0026]

According to a first aspect of the present invention, there is provided a multi-screen television receiver comprising a display means having a larger number of effective scanning lines than the number of effective scanning lines of a video signal serving as a main video source. Synchronizing signal generating means for driving the display means with a number of effective scanning lines larger than the number of effective scanning lines of a video signal serving as a source of the main image, and the main image based on an output of the synchronizing signal generating means By supplying the main video signal obtained by compressing the time axis of the video signal serving as the source to the display unit, all the effective scanning lines of the main video are projected on the display screen of the display unit. A multi-screen television receiver according to claim 2 of the present invention, wherein a predetermined different video other than the main video can be projected. More than the number of effective vertical pixels Display means having a number of vertical pixels, synchronization signal generation means for driving the display means with a number of effective vertical pixels greater than the number of effective vertical pixels of the video signal serving as the source of the main image, and the synchronization signal generation means By supplying a main video signal obtained by compressing a time axis of a video signal serving as a source of the main video to the display unit based on the output of the main video, the entirety of the main video is displayed on a display screen of the display unit. A multi-screen television receiver according to claim 5 of the present invention, further comprising compression means for projecting effective vertical pixels and projecting a predetermined image other than the main image. Display means having an aspect ratio of 4: 3 having the same number of effective scanning lines as the number of effective scanning lines of a compression mode video signal serving as a source of a main video having an aspect ratio of 16: 9, and a video signal in the compression mode No The number of scanning lines 3 /
By supplying a main video signal obtained by compressing the video to the display means to the display means, the main video is projected on the display screen of the display means, and another predetermined video other than the main video is projected. A multi-screen television receiver according to claim 6 of the present invention, wherein the multi-screen television receiver according to the sixth aspect of the present invention is capable of validating a compression mode video signal serving as a source of a main video having an aspect ratio of 16: 9. A display means having an aspect ratio of 4: 3 having the same number of effective vertical pixels as the number of vertical pixels, and a main video signal obtained by compressing the number of effective vertical pixels of the video signal in the compression mode to 3/4 times. A compression unit that supplies the display image to the display unit so that the main image is displayed on the display screen of the display unit and a predetermined image other than the main image is displayed. .

In the first aspect of the present invention, the compression means comprises:
The time axis of the video signal serving as the source of the main video is compressed based on the output of the synchronization signal generating means. By controlling the display of the display means using the output of the synchronization signal generating means, all the effective scanning lines of the main image are projected on the display screen, and another image is projected in an area other than the display area of the main image. I do.

According to a second aspect of the present invention, the compression means compresses the time axis of the video signal so that all the effective pixels of the main video are displayed on the display means. Further, another image is projected in an area other than the display area of the main image.

According to a fifth aspect of the present invention, the aspect ratio is 16
The video signal in the compression mode of 9 is compressed to 3/4 times the number of effective scanning lines by the compression means. The compressed main video signal is supplied to display means having an aspect ratio of 4: 3, and is displayed without distortion. Another image is displayed in an area other than the display area of the main image.

In the sixth aspect of the present invention, the compression means compresses the time axis of the video signal in the compression mode, so that the main video is displayed on the display means without distortion. Also,
Another image is projected in an area other than the display area of the main image.

[0031]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of a multi-screen television receiver according to the present invention. The present embodiment is an example in which a video display unit having a display screen with an aspect ratio of P: N and a number of effective scanning lines greater than the number of effective scanning lines of a main video signal to be inputted is adopted. .

The input terminal 21 receives a wide video signal having L scanning lines. For example, as a video signal,
A video signal in a compression mode with an aspect ratio of 16: 9 can be considered. This video signal is sent to the main video time axis compression unit 22.
, And also to the N / MfH horizontal synchronization generator 26. The N / MfH horizontal synchronization generator 26 separates the horizontal synchronization signal from the input video signal, and compresses the frequency fH of the separated horizontal synchronization signal by N / M (N> M) times for N / M for compressed display. Create horizontal sync signal and create vertical sync generator 2
7, supply to the deflection processing unit 28, the main video time axis compression unit 22, and the separate video generation unit 25.

The vertical synchronization generation section 27 generates a vertical synchronization signal by counting the N / M horizontal synchronization signal to generate a deflection processing section 28, a main video time axis compression section 22, and another video generation section.
It is designed to supply 25. The vertical synchronization generation unit 27
Assuming that one horizontal video period of the original video signal is TH, L ×
A vertical synchronizing signal having a period longer than the (M / N) TH period, for example, a vertical synchronizing signal having the same period as the vertical synchronizing signal of the video signal input through the input terminal 21 is generated.

The main video time axis compression section 22 compresses the time axis of the input video signal to M / N times based on the N / M horizontal synchronization signal and the vertical synchronization signal. Therefore, assuming that one horizontal video period of the original video signal is TH, the main video time axis compression unit 22
Is the (M / N) TH period. If one vertical video period of the original video signal is TV, the effective vertical video period of the main video signal from the main video time axis compression unit 22 is (M / N) TV period.

The main video signal from the main video time axis compression section 22 is supplied to the switching section 23. The output of the separate video generation unit 25 is also supplied to the switching unit 23. The separate video generator 25 generates another video signal such as a video, character, or graphics synchronized with the N / M horizontal synchronizing signal and the vertical synchronizing signal, and outputs it to the switching unit 23. Another video signal is (1--) in one vertical video period TV.
(M / N) This is for displaying another video during the TV period. One horizontal video period of another video signal is (M / N) T
H. The different video generator 25 generates a switching signal indicating the timing of switching between the main video and the different video, and supplies it to the switching unit 23.

When the (M / N) TV period of one vertical video period TV is designated by the switching signal,
The main video signal is selected and supplied to the video display unit 24, and another video signal is selected and supplied to the video display unit 24 in other periods.

The image display unit 24 has an effective scanning line number larger than L, and the deflection is controlled by the deflection processing unit 28. The deflection processing unit controls the horizontal and vertical deflection of the video display unit 24 based on the N / M horizontal synchronization signal and the vertical synchronization signal. That is, the deflection processing unit 28 scans one line of the video display unit 24 during one horizontal video period of the main video signal and another video signal, and scans the entire vertical direction of the video display unit 24 during one vertical video period of the original video signal. Is scanned. As a result, the image display unit 24 has L × N / M
Display the scanning lines of the book.

Next, the operation of the embodiment configured as described above will be described with reference to FIGS. FIG. 2 is an explanatory diagram for explaining display of a main image and another image, and FIG. 3 is a waveform diagram for explaining a main image time axis compression unit. 2A shows an input video signal, and FIG. 2B shows a display on a screen.

The aspect ratio of the image display unit 24 is P to N, and the number of effective scanning lines is larger than L. As shown in FIG.
As shown in (a), the number of scanning lines is L and the aspect ratio is 16: 9.
Is input. As this video signal, for example, an HDTV video signal can be considered.

The video signal input to the input terminal 21 is N / M
fH is supplied to the horizontal synchronization generator 26 and the main video time axis compressor 22. FIG. 3A shows a waveform of an input video signal in one vertical video period. As shown in FIG. 3A, one horizontal video period of the input video signal is TH, and one vertical video period is TV.

The N / MfH horizontal synchronization generator 26 separates the horizontal synchronization signal from the input video signal and sets the frequency to N.
An N / M horizontal synchronizing signal multiplied by / M is generated and output to the vertical synchronizing generator 27. The vertical synchronization generator 27 is, for example, L ×
A vertical synchronization signal is generated in N / M N / M horizontal synchronization signal periods. The vertical synchronizing signal and the N / M horizontal synchronizing signal are supplied to the main video time axis compression section 22, the separate video generation section 25, and the deflection processing section 28.
Supplied to

The main video time axis compression section 22 outputs a main video signal obtained by compressing the time axis of the input video signal to M / N times based on the N / M horizontal synchronization signal and the vertical synchronization signal.
FIG. 3B shows the compressed main video signal. FIG.
As shown in (b), the main video signal is L for one vertical video period.
The signal for the line is compressed during the (M / N) TV period.

The separate image generating section 25 generates another image signal for displaying a graphics screen such as characters and icons based on the N / M horizontal synchronizing signal and the vertical synchronizing signal. The different video signal is generated during a period in which no valid main video is displayed, that is, during a period {1- (M / N)} TV in FIG. 3B. The separate image generating unit 25 generates a switching signal for switching between the period of the main image and the period of another image, and
Output to 23.

The switching section 23 is supplied with the main video signal during the main video period, and is supplied with another video signal during another video period. Switching section
23 switches these video signals based on the switching signal and supplies them to the video display unit 24. For example, as shown in FIG. 2B, the switching unit 23 switches the video signal so that the main video is displayed on the upper part of the screen and another video is displayed on the lower part of the screen.

The deflection processing unit 28 scans using the N / M horizontal synchronizing signal and the vertical synchronizing signal so as to display the video signal for one horizontal video period on the entire display screen of the video display unit 24 in the horizontal direction. , The main image is displayed vertically (M /
N) In the TV period, scanning is performed so that another image is displayed in the {1- (M / N)} TV period.

Thus, two screens shown in FIG. 2B are displayed on the display screen of the video display unit 24. As shown in FIG. 2B, the aspect ratio of the main image is P to M, and the number of effective scanning lines is L. Another image is the number of scanning lines ｛(N / M) −
It is displayed in 1｝ × L lines.

As described above, in the present embodiment, the frequency of the synchronization signal is changed according to the aspect ratio of the screen and the main image and the number of scanning lines of the screen and the main image, and the changed synchronization signal is used. This compresses the time axis of the main video signal and controls the deflection. By using a horizontal synchronizing signal having a frequency higher than the frequency fH, it is possible to display another video in the margin of the main video. In this way, all the information of the main image can be projected on a relatively wide area of the screen without reducing the number of scanning lines. In the margin of the screen, another image such as a character or an icon can be displayed, and an effective multi-screen display can be performed. Also, a wide image can be displayed in the center of the screen in a very easy-to-see manner.

It is apparent that the separate video generating section 25 can output a plurality of different videos in the lower area of the screen by outputting different video signals of the plurality of videos.

FIG. 4 is a block diagram showing another embodiment of the present invention. 4, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. This embodiment is shown in FIG.
In this example, the main video time axis compression unit 22 is configured by a specific circuit, and N and M are set to 4 and 3, respectively.

In this embodiment, the main video time axis compression unit shown in FIG.
22 is an A / D converter 31, a synchronization processor 32, a timing processor
1 in that it comprises a memory 33, a memory 34, a write clock generator 35, a read clock generator 36, and a D / A converter 37. In the present embodiment, instead of the N / MfH horizontal synchronization generator 26, 4 / 3fH horizontal synchronization for generating a synchronization signal of a frequency 4 / 3fH, which is 4/3 times the horizontal frequency fH of the original video signal. The generator 30 is employed.

The main video signal input via the input terminal 21 is supplied to an A / D converter 31 and a synchronization processing section 32. A
The / D converter 31 converts the input main video signal into a digital signal and supplies it to the timing processing unit 33. Synchronous processing section
32 separates the horizontal synchronizing signal (H) and the vertical synchronizing signal (V) from the main video signal, and outputs them to the timing processing unit 33.

The write clock generator 35 generates a write clock WCK having a horizontal cycle synchronized with the horizontal and vertical synchronizing signals and outputs it to the timing processor 33. In addition, the read clock generator 36 generates a write clock WCK having a horizontal cycle synchronized with the horizontal and vertical synchronization signals, and outputs the write clock WCK to the timing processor 33. Also, a read clock generator
36 is 4/3 of the horizontal frequency via the timing processing unit 33
A double frequency read clock RCK is generated and output to the timing processing unit 33.

The timing processor 33 controls the writing and reading of the memory 34 by using the write clock WCK from the write clock generator 35 and the read clock RCK from the read clock generator 36, so that the time axis of the video signal is controlled. Is compressed. That is, the timing processing unit 33 outputs the horizontal frequency write clock WCK.
Of the input video signal is compressed to 3/4 times by the read clock RCK having a frequency that is 4/3 times the horizontal frequency, and D / A conversion is performed as the main video signal. Output to the container 37.

The D / A converter 37 converts the input main video signal into an analog signal and outputs the analog signal to the superimposing section 23. Other configurations are the same as those in the embodiment of FIG.

Next, the operation of the embodiment configured as described above will be described.

It is assumed that the aspect ratio of the image display unit 24 is 4: 3. The horizontal and vertical dimensions of the input video signal are, for example, 16: 9. This video signal is supplied to the synchronization processing section 32, where the horizontal and vertical synchronization signals are separated, and supplied to the 4 / 3fH horizontal synchronization generation section 30 to obtain a synchronization signal having a frequency of 4 / 3fH. The horizontal synchronization signal from the 4 / 3fH horizontal synchronization generator 30 is supplied to the vertical synchronization generator 27,
Deflection processing unit 28, separate video generation unit 25, and timing processing unit 33
Supplied to

The vertical synchronizing section 27 counts the horizontal synchronizing signal from the 4 / 3fH horizontal synchronizing section 30 to reproduce the vertical synchronizing signal having the same frequency as the vertical synchronizing signal of the input video signal, and to perform the deflection processing. 28, output to the separate video generator 25 and the timing processor 33.

The timing processing unit 33 writes the video signal input by the write clock WCK synchronized with the horizontal synchronization signal of the original video signal into the memory 34, and
Read clock RCK synchronized with the horizontal synchronization signal of fH
Thereby, the video signal stored in the memory 34 is read. As a result, the timing processing unit 33 obtains a main video signal obtained by compressing the time axis of the input video signal by 3/4.

The main video signal from the timing processing section 33 is D
The signal is returned to the analog signal by the A / A converter 37 and
Supplied to The superimposing section 23 is different from the main video signal in the video generating section 25.
And supplies it to the video display unit 24 by switching to another video signal.

The deflection processing unit 28 displays the video signal of one horizontal cycle of the main video signal on the whole area of the video display unit 24 in the horizontal direction.
The main video signal for the screen is divided into 3
The horizontal and vertical deflections of the video display unit 24 are controlled so that the image is displayed in the ４ area.

In this way, the video display unit 24 displays the input wide video signal in the upper 3/4 area of the screen and displays another video in the lower 1/4 area of the front screen. That is, another image is (the number of image partial scanning lines of the main image) × (4 / 3−
1) It is displayed at the number of scanning lines. The number of scanning lines on one screen of the main video is the same as the number of scanning lines on one screen of the original video signal, and the main video has an easy-to-view display without information loss, and has an effective aspect ratio of 4: 1. 3 is displayed on the display screen.

The other operations are the same as those of the embodiment shown in FIG.

As described above, in the present embodiment, it is possible to display a wide-screen image having an aspect ratio of 16: 9 in an easy-to-view display on a display screen having an aspect ratio of 4: 3 without losing information. Can be.

FIG. 5 is a block diagram showing another embodiment of the present invention. 5, the same components as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted. This embodiment is shown in FIG.
5 shows an example in which another video generation unit 25 is configured by a specific circuit.

In this embodiment, the separate video generator 25 includes an A / D converter 5, a synchronization processor 14, a timing processor 6, a write clock generator 7, a read clock generator 8, a memory 9,
/ A converter 13 and horizontal / vertical decimation and filter processing unit
It consists of 41. A / D converter 5, synchronization processing unit
14, timing processor 6, write clock generator 7, read clock generator 8, memory 9, and D / A converter 1
3. The configuration is the same as that of the A / D converter 31, the synchronization processor 32, the timing processor 33, the write clock generator 35, the read clock generator 36, the memory 34, and the D / A converter 13, respectively.

In the present embodiment, another video signal input via the input terminal 40 is used as another video. The other video signal is supplied to the A / D converter 5 and the synchronization processing unit 14. The video signal from the A / D converter 5 is supplied to a horizontal / vertical thinning-out and filter processing unit 41. The horizontal / vertical thinning-out and filtering unit 41 thins out the input video signal in the horizontal and vertical directions, filters it, and supplies it to the timing processing unit 6. The timing processing unit 6 compresses the input different video signal in the horizontal direction, generates a switching signal indicating the scanning timing of the different video signal, and supplies the switching signal to the superimposing unit 23.

Next, the operation of the embodiment configured as described above will be described.

The processing for the main image is the same as in the embodiment of FIG. Another video signal input via the input terminal 40 is converted into a digital signal by the A / D converter 5 and then supplied to the horizontal / vertical thinning-out and filter processing unit 41. The horizontal / vertical thinning-out and filter processing section 41 thins out the video signal in the horizontal and vertical directions and performs filter processing.

Also in the present embodiment, another video can be displayed in a portion of (the number of video partial scanning lines of the main video) × (4 / 3-1) number of scanning lines. The horizontal and vertical thinning-out and filter processing unit 41 performs thinning-out in the vertical direction so that the number of scanning lines corresponding to the number of scanning lines that can be displayed as another image is eliminated. In the horizontal direction, thinning and filtering are performed so that the number of pixels in the horizontal direction corresponds to the aspect ratio of the image displayed as another image.

The timing processing section 6 writes another video signal into the memory 9 by the write clock WCK having the same frequency as the horizontal synchronization signal of the other video signal, and reads out a frequency that is 4/3 times the horizontal synchronization signal of the main video signal. Clock RC
By K, another video signal written in the memory 9 is read. Thus, another video signal synchronized with the horizontal synchronization signal of the main video signal is obtained from the timing processing unit 6. Further, the timing processing unit 6 generates a switching signal indicating a scanning timing of another video signal and supplies the switching signal to the superimposing unit 23.

The superimposing section 23 selects the main video signal and another video signal in accordance with the switching signal and outputs the selected video signal to the video display section 15. The deflection of the image display unit 15 is controlled by the deflection processing unit 28, so that the main image and another image are displayed. In this case, as in the embodiment of FIG. 4, the main image is displayed in the ３ area at the top of the screen, and another image is displayed in the １ ／ area at the bottom of the screen.

As described above, also in this embodiment, FIG.
The same effect as that of the embodiment can be obtained.

FIG. 6 is a block diagram showing another embodiment of the present invention. 6, the same components as those in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted. This embodiment is an example in which an image display unit 24 having a smaller number of scanning lines than the number of scanning lines of a main image is used. For example, the video display unit 24
A display device compatible with the NTSC system is employed.

In this embodiment, a 4 / 3fH horizontal synchronization generator
This embodiment differs from the embodiment shown in FIG. 5 in that a vertical thinning and filter processing circuit 45 is added in addition to omitting the vertical synchronization generator 27 and the vertical synchronization generator 27. The output of the A / D converter 31 is supplied to the timing processing section 33 via the vertical thinning and filtering section 45. Vertical thinning and filtering unit 45
Is based on the number of scanning lines of the input main video signal and the number of scanning lines of the video display unit 24.
Output.

The timing processing units 6 and 33 are provided with a horizontal synchronizing signal (H) and a vertical synchronizing signal (V) from the synchronization processing unit 32.
, Writing and reading to and from the memories 9 and 31 are controlled. The deflection processing unit 28 also controls the deflection of the video display unit 24 using the horizontal and vertical synchronization signals from the synchronization processing unit 32.

Next, the operation of the embodiment configured as described above will be described.

The aspect ratio of the display screen of the video display unit 24 is 4 to 3.
And the number of scanning lines is smaller than the number of scanning lines of the main video signal. For example, it is assumed that the main video is an HDTV signal having an aspect ratio of 16: 9, and the video display unit 24 is compatible with the current NTSC system.

The synchronization processing section 32 separates a horizontal synchronization signal and a vertical synchronization signal from the main video signal. The main video signal is converted into a digital signal by the A / D converter 31, and then supplied to the vertical thinning and filtering unit 45. The vertical thinning / filtering unit 45 thins out the input video signal by a factor of 3/4 in the vertical direction and filters it.

The timing processing section 33 writes the video signal to the memory 34 by the write clock WCK of the horizontal synchronization signal frequency, and reads the main video signal from the memory 34 by using the read clock RCK of the horizontal synchronization signal frequency. This main video signal is returned to an analog signal by the D / A converter 37 and then supplied to the superimposing unit 23.

On the other hand, another video signal input via the input terminal 40 is also subjected to horizontal / vertical decimation and a filter processing section.
The compression processing is performed in the horizontal and vertical directions by 41. The separate video signal is read out by the timing processing section 6 in synchronization with the horizontal and vertical synchronizing signals of the main video, and is supplied to the superimposing section 23 after being converted back to an analog signal by the D / A converter 13.

In this way, the main video signal having an aspect ratio of 16: 9 is supplied to the video display section 24 in the main video period, and another video signal is supplied in another video period. The main video signal can be displayed without distortion on, for example, the upper part of the screen. Further, for example, a plurality of different images can be displayed below the main image.

As described above, in this embodiment, even when a video display unit having a smaller number of scanning lines than the number of scanning lines of the main video signal is employed, the main video and another video can be displayed in a legible manner.

FIG. 7 is a block diagram showing another embodiment of the present invention. 7, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In the embodiment of FIG. 1, there is a possibility that the resolution of another image is relatively low. In the present embodiment, the resolution of another image is improved by increasing the density of scanning lines in another image portion.

In this embodiment, an N / MfH horizontal synchronization generator
This embodiment differs from the embodiment of FIG. 1 in that a horizontal synchronization generator 50 is used instead of 26 and a scanning density converter 51 is added.

The horizontal sync generator 50 generates a horizontal sync signal having a frequency higher than the horizontal frequency fH of the input video signal, and the vertical sync generator 27 generates a horizontal sync signal based on the horizontal sync signal output from the horizontal sync generator 50. A vertical synchronizing signal is generated. The main video time axis compression unit 22 compresses the time axis of the input video signal using the horizontal synchronization signal from the horizontal synchronization generation unit 26. By using a horizontal synchronizing signal having a frequency higher than the frequency fH, another image can be displayed in the margin of the main image also in the present embodiment.

In the present embodiment, the separate video generator 25
Are supplied to the superimposing section 23 and also to the scanning density converting section 51. The scanning density conversion unit 51 converts the scanning density of the vertical synchronization signal from the vertical synchronization generation unit 27 and supplies it to the deflection processing unit 28. Note that the scanning density conversion unit 51
The horizontal synchronizing signal is supplied to the deflection processing unit 28 as it is.

Next, the operation of the embodiment configured as described above will be described.

The horizontal synchronizing generator 50 outputs a horizontal synchronizing signal having a frequency higher than that of the input video signal. By using this horizontal synchronization signal, the main video time axis compression unit 22 compresses the time axis of the main video signal. Thus, in the present embodiment, as in the embodiment of FIG. 1, the main video can be displayed without loss of information without changing the aspect ratio and the number of scanning lines of the main video.

On the other hand, the scanning line density converter 51 increases the scanning line density of the vertical synchronizing signal. As a result, it is possible to display another image with a higher vertical resolution per unit area.

By the way, in order to make it easy to see the main image and the different image, it is conceivable to provide a frame for dividing the main image and the different image. FIG. 8 is an explanatory diagram for explaining this frame.

As shown in FIG. 8, on the front of the video display unit,
A frame using a predetermined material is attached to the periphery of the main image and another image and at the boundary between the main image and another image. The width of the frame portion at the boundary between the main video and another video is set to a predetermined width W.

With this configuration, the distance W occurs at the boundary between the main image and another image, and since the boundary is of the same quality as the periphery of the screen, it is felt that the main screen and another screen are separated. Can be given to viewers. This makes it easy for the viewer to concentrate on the main screen, and enables easy-to-view display.

FIG. 9 is a block diagram showing another embodiment of the present invention. 9, the same components as those of FIG. 4 are denoted by the same reference numerals, and the description will be omitted. This embodiment is shown in FIG.
Is modified so that the frame of FIG. 8 is generated by an image.

In the present embodiment, the frame signal generating section 51 and the superimposing section
This embodiment differs from the embodiment of FIG. 4 in that 52 is added. The frame signal generation unit 51 generates a frame signal and a frame switching signal, and outputs them to the superimposition unit 52. The frame signal is for displaying, for example, the frame of FIG. 8 by video.

The output of the superimposition unit 23 is also given to the superimposition unit 52. When the video period is indicated by the frame switching signal, the output of the superimposition unit 23 is selected and output to the video display unit 24. When the period is indicated, a frame signal is selected and output to the video display unit 24.

In the embodiment configured as described above, a video signal of a main video and another video is generated as in the embodiment of FIG. On the other hand, the frame signal generation unit 51 generates a frame signal for surrounding the main video and another video, and displaying a frame that defines a boundary between the main video and the different video.

The main video signal and the frame video signal are selected by the superimposing unit 52 during the display period of the main video and another video, and the frame signal is selected and supplied to the video display unit 24 during the display period of the frame video. . Thereby, similarly to FIG. 8, the main video and another video surrounded by the frame can be displayed.

As described above, in the present embodiment, the same effect as that of FIG. 8 can be obtained by using an image.

Further, it is possible to improve the visibility of the screen by switching the size of the frame image by the frame signal between the main image portion and another image portion. FIG. 10 is an explanatory diagram showing the display of such a frame image.

According to the frame signal from the frame signal generating section 51, the horizontal size of another video is set to be smaller than the horizontal size of the main video, and another video is compressed in the horizontal direction so as to match the horizontal size of another video. I do.

With this configuration, it is possible to change the width of the main image and another image, and to increase the apparent sense of stability of the main image. This makes it easy to concentrate consciousness on the main screen.

Note that the display is the same as that shown in FIG.
Obviously, the front of the video display unit may be surrounded by the same material.

In each of the above embodiments, the video display unit
Although the case where the number of scanning lines is variable by deflection processing, such as a CRT, has been described as 24, it is apparent that a liquid crystal panel or the like having a fixed resolution may be used as the image display unit. In this case, in order to apply to the embodiment of FIG. 7, it is necessary to prepare in advance an area corresponding to another video having a different resolution from other parts.

[0104]

As described above, according to the present invention, even when a wide image in the compression mode is input, the wide image can be displayed as a main image on a multi-screen without losing information. Even if video is input, this wide video is displayed as the main video,
Another image can be effectively displayed in the margin portion, and further, when a multi-screen display is performed using a wide image as a main image, the visibility of the main image can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a multi-screen television receiver according to the present invention.

FIG. 2 is an explanatory diagram illustrating an embodiment.

FIG. 3 is a waveform diagram illustrating an embodiment.

FIG. 4 is a block diagram showing another embodiment of the present invention.

FIG. 5 is a block diagram showing another embodiment of the present invention.

FIG. 6 is a block diagram showing another embodiment of the present invention.

FIG. 7 is a block diagram showing another embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a display using a frame.

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

FIG. 10 is an explanatory diagram showing a display using a frame.

FIG. 11 is a block diagram showing a conventional multi-screen television receiver.

FIG. 12 is an explanatory diagram for explaining a display in a conventional example.

[Explanation of symbols]

22: main video time axis compression unit, 23: superimposition unit, 24: video display unit, 25: separate video generation unit, 26: N / MfH horizontal synchronization generation unit, 27: vertical synchronization generation unit, 28: deflection processing unit

Claims (11)

[Claims] A display unit having a number of effective scanning lines larger than the number of effective scanning lines of a video signal serving as a source of a main image; A synchronization signal generating means for driving with a large number of effective scanning lines, and a main video signal obtained by compressing a time axis of a video signal serving as a source of the main video based on an output of the synchronization signal generating means. A compression unit that supplies all the effective scanning lines of the main image on the display screen of the display unit and supplies a predetermined image other than the main image on the display screen of the display unit. A multi-screen television receiver characterized by the following. 2. A display unit having a number of effective vertical pixels larger than the number of effective vertical pixels of a video signal serving as a source of a main image, and a display unit configured to display the display unit based on the number of effective vertical pixels of a video signal serving as a source of the main image. Synchronous signal generating means for driving with a large number of effective vertical pixels, and a main video signal obtained by compressing a time axis of a video signal as a source of the main video based on an output of the synchronous signal generating means. A compression unit that supplies all the effective vertical pixels of the main image to the display screen of the display unit by supplying the image to the display unit and enables a predetermined different image other than the main image to be displayed. A multi-screen television receiver characterized by the following. 3. The main image has an aspect ratio of 16: 9, and the display means has an aspect ratio of the display screen of 4: 3, and effectively scans a video signal serving as a source of the main image. The compression means has an effective scanning line number of 4/3 times the number of lines, and the compression means compresses a time axis of a video signal serving as a source of the main video to 3/4 times, and displays the main video on the display means. 2. The multi-screen television receiver according to claim 1, wherein all effective scanning lines are displayed on the display screen without distortion. 4. The main picture has an aspect ratio of 16: 9, the display means has an aspect ratio of the display screen of 4: 3, and an effective vertical ratio of a video signal serving as a source of the main picture. The compression means has an effective vertical pixel number of 4/3 times the number of pixels, and the compression means compresses a time axis of a video signal as a source of the main video to 3/4 times, and displays the main video on the display means. The multi-screen television receiver according to claim 2, wherein all effective vertical pixels are displayed on the display screen without distortion. 5. A display means having an aspect ratio of 4: 3 having the same number of effective scanning lines as the number of effective scanning lines of a compression mode video signal serving as a source of a main image having an aspect ratio of 16: 9. By supplying a main video signal obtained by compressing the effective scanning line number of the video signal in the compression mode to 3/4 times to the display means, the main video is projected on a display screen of the display means. A multi-screen television receiver comprising compression means for displaying a predetermined image other than the main image. 6. A display means having an aspect ratio of 4: 3 having the same number of effective vertical pixels as the number of effective vertical pixels of a compression mode video signal which is a source of a main image having an aspect ratio of 16: 9. By supplying a main video signal obtained by compressing the number of effective vertical pixels of the video signal in the compression mode to 3/4 times to the display unit,
A multi-screen television receiver, comprising: compression means for projecting the main image and capable of projecting a predetermined image other than the main image. 7. The apparatus according to claim 1, further comprising a scanning line density conversion unit configured to increase a scanning line density of said another image displayed on a display screen of said display unit to be higher than a scanning line density of said main image. Item 6. A multi-screen television receiver according to any one of Items 1 or 5. 8. A vertical pixel density conversion means for making a vertical pixel density of the another image displayed on a display screen of the display means higher than a vertical pixel density of the main image. Item 7. A multi-screen television receiver according to any one of Items 2 and 6. 9. A display device provided in front of a display screen of the display means,
The multi-screen television receiver according to claim 1, further comprising a frame member that partitions the main image from another image. 10. The display device according to claim 1, further comprising frame display means for displaying a frame display for dividing the main image and another image on a display screen of the display means. The multi-screen television receiver according to any one of the above. 11. The multi-screen television according to claim 1, wherein a width of the another image displayed on a display screen of the display unit is smaller than a width of the main image. John receiver.