JPH08251501A - Scroll display device for television image - Google Patents

Abstract

PURPOSE: To simply confirm the program content of lots of channels. CONSTITUTION: Images of lots of channels other than a watched channel are stored in a video memory as sub-images, when a multi-channel display mode is set, the program of a channel CH1 to be watched is displayed as a main image as shown in figure (a) and plural sub-images of channels CH3, 4, 6 are displayed in terms of PinP or PoutP method. When the image is scrolled, the display area is entirely moved vertically for the sub-images and the image of other sub-channel CH8 is being displayed as shown in figure (b). When any of the sub-images is pointed out, the main and sub-images CH1, CH6 are replaced with each other as shown in figures (c), (d). When the multi-channel display mode is released, the desired channel CH6 is watched.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly to a television video scroll display device for simultaneously displaying a plurality of channels of television video on the same television screen.

[0002]

2. Description of the Related Art Conventionally, in a television receiver, images of a plurality of channels (television stations) are simultaneously displayed on the same screen so that it is possible to know what kind of program is being broadcast on another channel. The technology is known. As an example, there is a method using the PinP or PoutP method.
One channel can be received, and the program of one channel that is desired to be viewed over the entire display screen of the television receiver (hereinafter, simply referred to as TV screen) is displayed as the parent screen, and the program of the other channel different from this is displayed. Is reduced and displayed on a part of the TV screen as a child screen. According to this, two programs to be viewed can be viewed at the same time.

Of course, the channels of the parent screen and the child screen can be changed, and the channels of the parent screen and the child screen can be changed.

On the other hand, a technique has been proposed in which images of all receivable channels are simultaneously displayed on the same TV screen so that the program contents of the respective channels can be simultaneously confirmed. As one example, Japanese Patent Publication No. 6-34502
The technique disclosed in Japanese Patent Publication No. 1-83200 selects all channels in order using one tuner, and as shown in FIG.
The images of the respective channels are arranged and displayed on the screen 100. Here, it is assumed that 9 channels are displayed.

Then, for example, CH (channel) 1 →
CH4 → CH7 → CH2 → CH5 → CH8 → CH3 → C
As in the order of H6 → CH9 → CH1 →, the display images of these 9 channels are switched in order and the display contents are changed along with the moving image. Since flicker occurs in the entire image, and therefore all nine display images are flickering and are very difficult to see, the scrolling method is used to slowly change each display image.

FIG. 16 is a diagram showing this scrolling. Now, looking at one channel, when switching from an image displaying a circle to an image displaying a triangle, FIGS. 16 (a), 16 (b), (C), (d), (e), (f)
As shown in the order of, the displayed circular image is replaced with the next triangular image in order from the top. As a result, each displayed image switches slowly over time, so that flicker does not occur.

According to this, it is possible to confirm the program contents of all the channels at the same time, and by designating the channel to be watched, the entire TV screen 100 is replaced with the designated channel instead of the display shown in FIG. Only the image will be displayed.

Although the technique described in Japanese Patent Publication No. 6-34502 described above scrolls vertically, the technique disclosed in Japanese Patent Publication No. There is a technique described in Japanese Patent Publication No. 34503.

[0009]

By the way, the above-mentioned Pin
In the parent-child screen display by P or PoutP, only programs of two channels can be watched at the same time. Of course, when it is desired to check a program on another channel, it is not necessary to switch the sub-screen channel, but it is necessary to operate different operation buttons for each channel, which makes the operation troublesome.

Further, as described in Japanese Patent Publication No. 6-34502, if the images of all the channels are displayed together, the contents of all the programs can be confirmed at the same time. If you want to check what kind of program is being broadcast on another channel while you are watching, the display as shown in Fig. 15 is displayed, so the program you have been watching so far will be interrupted. become.
Of course, the video of this program is also displayed as one of the nine display videos shown in FIG. 15, but it is not a complete video,
It becomes an unnatural image that changes by scrolling at regular intervals, which is insufficient for viewing.

An object of the present invention is to solve such a problem, and to make it possible to confirm the program content of another arbitrary channel by a simple operation without the video of the program of the channel being watched being particularly damaged. Another object of the present invention is to provide a scroll display device for television images.

[0012]

In order to achieve the above object, the present invention provides first and second receiving means for receiving a video signal of a broadcast program, and reception by the first and second receiving means. A selection means for selecting one of the selected video signals as a main video signal and the other video signal as a sub video signal; and a video storage area for each of a plurality of channels received by the first and second channel selection means. Assigned memory means, writing means for writing images of different channels of the sub-picture signal to the corresponding storage areas of the memory means, respectively, and an integer number of storage areas narrower than the entire storage area of the memory means. Minute reading area is set, and reading in the reading area is made faster than when writing,
And a reading means for moving the reading area on the memory means, and means for synthesizing a video signal read from the memory means by the reading means with the main video signal to display an image. The image of the main image signal is used as the main image, the images of the plurality of channels read by the reading means are used as sub-images, respectively, and the main image and the plurality of sub-images are displayed on the screen. The entire display area is scrolled so that all the sub-pictures stored in each storage area of the memory means appear in sequence on the screen.

The present invention further comprises means for designating one of the sub-pictures displayed on the screen, and means for switching the video signal of the channel of the designated sub-picture to the main picture signal.

[0014]

In the memory means in which a large number of sub-pictures are stored, in the area where the sub-pictures are stored, a read area having a size corresponding to an area including a predetermined number of sub-pictures among these sub-pictures is provided. The read area is set and can be moved within the entire area where the sub-pictures are stored so that the plurality of sub-pictures can be read out in a predetermined order within the read-out area. The video signal of the sub video read out from the memory means in this manner is combined with the video signal of the main video and displayed as an image.

Therefore, on the display screen, along with the main image,
A plurality of sub-pictures are displayed in a predetermined order, for example, arranged in the vertical direction or the horizontal direction. As a result, it is possible to confirm the program contents of a plurality of channels by the displayed sub-pictures without hindering the viewing of the main picture. Furthermore, the operation of moving the reading area in the memory means is performed. As a result, the video is scrolled as a whole in the display area of the sub video on the display screen, and it is possible to display other sub video that has not been displayed until now. Therefore, it is possible to confirm the program contents of all channels whose sub-pictures are stored in the memory means.

When one of the displayed sub-pictures is designated, the video signal for this sub-picture is switched to the main picture signal. As a result of checking the program content of each channel by the sub-picture, the desired sub-channel is selected. Even if you want to watch instead of the previous main channel, the switching operation for that is very easy.

[0017]

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

FIG. 1 is a block diagram showing a first embodiment of a scroll display device for television images according to the present invention, in which 1 is an antenna, 2 and 3 are tuners, and 4 and 5 are IFs.
Processing means, 6, 7 are input terminals, 8 is a signal switching circuit, 9 is a main video signal processing circuit, 10 is a main synchronization signal processing circuit, 11
Is a sub video signal processing circuit, 12 is a sub sync signal processing circuit, 1
3 is a signal switching circuit, 14 is a video output circuit, 15 is a deflection circuit, 16 is a CRT (CRT), 17 is a multiplexer, 18 is an A / D (analog / digital) converter, 1
9 is a video memory control processing circuit, 20 is a video memory, 21
Is a reference signal generation circuit, 22 is a D / A (digital / analog) converter, 23 is a control processing unit, 24 and 25 are channel selection processing circuits, 26 is an input operation unit, 27 is a screen display processing circuit,
28 is a memory.

In the figure, various control information is stored in the memory 28, and the control processing circuit 23 composed of a microcomputer or the like uses the control information of this memory 28 to perform an input operation of an operation panel or a remote controller. Each unit is controlled according to the command information from the unit 26.

The reception signal of the antenna 1 is supplied to the tuners 2 and 3. These tuners 2 and 3 have a control processing unit 23.
The television signals of the channels corresponding to the channel selection signals of the channel selection processing circuits 25 and 24 controlled by
The signals are amplified and detected by the processing means 4 and 5 and demodulated into a video signal, and then supplied to the signal switching circuit 8. In addition, the signal switching circuit 8 is connected to the VT from the input terminals 6 and 7.
Video signals can be input from external devices such as R, video discs, facsimiles, and personal computers.

The signal switching circuit 8 is controlled by the control processing unit 23, and one of the video signals from the IF processing means 4 and 5 and the video signals from the input terminals 6 and 7 is used as the main video signal M.
In addition to being selectively output as v, either of the video signals from the IF processing means 4 and 5 can be selectively output as the sub-video signal Sv.

The main video signal Mv output from the signal switching circuit 8 is processed by the main video processing circuit 9, then passes through the signal switching circuit 13, is amplified by the video output circuit 14, and is then output from the CRT 1.
6. The main video signal Mv output from the signal switching circuit 8 is supplied to the main synchronization processing circuit 10, the horizontal and vertical synchronization signals are separated and supplied to the deflection circuit 15, and the deflection wave signal of the CRT 16 is formed. .

When the power is turned on or during normal use, the signal switching circuit 8 is controlled by the control processing unit 23 so as to control the main video signal M.
Selectively output only v. Therefore, on the CRT 16, only the video of the main video signal Mv is displayed on the entire TV screen. The main video signal Mv is selected by operating the input operation unit 26, either the video signal of the program of the channel selected by the tuner 2 or 3 or the output video signal of the external device from the input terminals 6 and 7. In addition, the control processing unit 23 controls the channel selection processing circuit 24 or 25 by selecting the channel with the input operation unit 26, and the tuner 3 or 2 selects the video of the program of the desired channel. Can be displayed.

What has been described above is the same as the normal use method for displaying an image of one channel on the CRT 16 in an ordinary television receiver. In the first embodiment, the image of the main image signal Mv (hereinafter referred to as the main image)
At the same time, the image of the sub-picture signal Sv (hereinafter referred to as sub-picture) is simultaneously displayed on the TV screen of the CRT 16 so that a plurality of sub-picture channels (hereinafter referred to as sub-channel) other than the main video channel (hereinafter referred to as main channel) Say)
The contents of the program can be confirmed. Hereinafter, such a use mode is referred to as a multi-channel display mode (in contrast, a mode in which only one channel image is displayed on the TV screen is hereinafter referred to as a normal display mode). The display mode will be described.

Now, in the normal display mode state, when the signal switching circuit 8 is selecting the video signal from the IF processing means 4 as the main video signal Mv, the input operation section 26 is operated to instruct the multi-channel display mode. Then, the control processing unit 2
3 controls each part, and the signal switching circuit 8 controls the main video signal Mv.
Is used as the video signal from the IF processing means 4, the video signal from the IF processing means 5 is selectively output as the sub-video signal Sv, and the tuning processing circuit 24 is controlled to select the channel in the tuner 3. Switch channels sequentially. In this case, the channel selected by the tuner 3 may include the channel selected by the tuner 2 (that is, the main channel), but in the following description, it is not included.

The sub-picture signal Sv output from the signal switching circuit 8 is processed by the sub-picture processing circuit 11 such as separation of the luminance signal and the color difference signal, and then the multiplexer 17 performs the luminance signal and the two chromaticity signals. Is converted into a dot-sequential signal, and further converted into a digital signal by the A / D converter 18 and supplied to the video memory control processing circuit 19. In the video memory control processing circuit 19, under the control of the control processing unit 23, image reduction processing for reducing the vertical and horizontal directions of the video is performed, and the image-reduced signals are output for each channel.
It is written in different recording areas of the video memory 20.

Then, based on the reference signal from the reference signal generating circuit 21, the image memory control processing circuit 19 reads out the image reduced image signal of each channel recorded from the image memory 20. D / A converter 22
Is converted into an analog signal. This analog signal is supplied to the demultiplexer 29, and the sub-picture signal Sv ′ separated into the luminance signal and the two color difference signals is obtained. The sub video signal Sv ′ is supplied to the signal switching circuit 13, and is switched and combined with the main video signal Mv processed by the main video processing circuit 9 to form one video signal. This video signal is amplified by the video output circuit 14 and supplied to the CRT 16. At this time as well, the deflection circuit 15 is supplied with the synchronization signal separated from the main video signal Mv by the main synchronization processing circuit 10, so that the CRT 16 is deflected in synchronization with the synchronization signal of the main video signal.

Sub-picture signal Sv to the picture memory 20
Writing and image reduction processing therefor are performed in synchronization with the sub-synchronization signal separated from the video signal Sv by the sub-synchronization signal processing circuit 12, and in synchronization with the main synchronization signal from the main synchronization signal processing circuit 10. Thus, the read timing from the video memory 20 is controlled. Therefore, the main video signal Mv and the sub video signal Sv are asynchronous, but the two are synchronized with each other.

Further, the switching control signal SW is supplied from the video memory control processing circuit 19 to the signal switching circuit 13. As a result, the signal switching circuit 13 selects the image-reduced sub-video signal Sv ′ from the demultiplexer 29 during the read period from the video memory 20, and the main video from the main video signal processing circuit 9 during the other periods. Select the signal Mv.

In this way, the video of the main video signal Mv and the sub video signal Sv 'synthesized by the signal switching circuit 13 is CR.
The image is displayed at T16, and its display image is shown in FIG. Here, it is assumed that the main image and three sub-images are displayed on the TV screen 16a of the CRT 16, the main image is channel 1 (CH1; hereinafter the same), and the sub-image is on the right side of the TV screen 16a. Three of them are arranged in the vertical direction and displayed, and are CH3, CH4, and CH6 in order from the top. Further, here, the main video is a moving image, but the displayed sub video is a still image.

The image memory 20 stores images of all channels other than the main channel, of which three channels are read and displayed on the CRT 16. When a scroll operation is performed on the input operation unit 26, the control processing unit 23 controls the video memory control processing circuit 19 to change the read area of the video memory 20. Accordingly, as is clear from FIGS. 2 (a) and 2 (b), T
The display of the entire display area of the sub-picture on the V screen 16a appears to have moved upward as indicated by the arrow, and when this scroll operation is released, as shown in FIG.
The display state is different from that in (a). Here, still images of CH4, CH6, and CH8 are displayed in order from the top. Also, depending on how to operate the input operation unit 26,
You can also scroll down.

In this way, by scrolling the display area of the sub-picture, the sub-pictures of all channels other than the main channel can be viewed, and the contents of these can be confirmed.

The scrolling in the present invention means that the display content of the entire display area of the sub-picture moves up and down in this way, and the display position of the channel is determined as shown in FIG. The above-mentioned Japanese Patent Publication No. 6-345, in which the image is switched from above within the display position.
This is completely different from the scroll in the technique described in Japanese Patent Laid-Open No. 02-2002.

When the multi-channel display mode is canceled by operating the input operation unit 26 in the display state shown in FIG. 2A, only the moving image of the main channel CH1 is displayed on the entire TV screen 16a. Return to normal display mode.

In the display state shown in FIG. 2C, for example, C
If this channel is specified by operating the input operation unit 26 to view the H6 image, the control processing unit 2
3 controls the tuning processing circuits 25 and 24, and the tuner 2 is C
In addition to selecting H6, the tuner 3 selects CH1 as the main channel so far. Then, the signal switching circuit 8 is controlled by the control processing unit 23.
The video signal of CH1 output from the IF processing means 5 is selectively output as the sub-video signal Sv, and the video memory control processing circuit 19 is controlled by the control processing unit 23, and the video of CH1 which is the sub-video signal Sv. One image of the signal is reduced and written in the area of the video memory 20 where the sub-picture of CH6 was stored. As a result, on the TV screen 16a of the CRT 16, as shown in FIG.
The image of H6 is displayed as a moving image, and the still image of CH1 is displayed as a sub-image in the portion where the still image of CH6 was displayed in FIG. 2C. That is, the main video and the sub video are displayed in an interchanged manner.

When the multi-channel display mode is canceled by operating the input operation unit 26 in the display state shown in FIG. 2 (d), the image of the main channel CH6 is displayed as shown in FIG. 2 (e). Return to the normal display mode displayed on the entire TV screen. Then, when the multi-channel display mode is designated again, the multi-channel display in which the main image as the moving image of CH6 is used as in the case of FIG. 2A is performed as described above. And in the exchange of the main and sub-pictures,
Since CH6 and CH1 are switched in the sub-channel, the arrangement order of the displayed sub-pictures is CH3, CH.
4, CH1, CH8, CH10, CH12 will be disturbed, but once the multi-channel display mode is canceled and reset as described above, the writing of the video of all the sub-channels to the video memory 20 becomes the channel. Since they are performed in order, as shown in FIG. 2 (f), the order of arrangement is such that the channels are arranged in ascending order, making it easy to confirm each channel by scrolling.

It should be noted that, for example, in the display state shown in FIG. 2C, the input operation section 26 can be operated to indicate the sub-channel with the cursor. Of course, in this case, only the sub-channel displayed on the TV screen 16a can be designated, and if the sub-picture of CH6 is designated now,
In the same manner as above, CH1 and CH6 are exchanged, and C
H6 is the main channel.

Next, the video memory control processing circuit 19 for performing such multi-channel display will be described.

The write operation of the video memory control processing circuit 19 to the video memory 20 will be described in more detail. In FIG. 1, the control processing unit 23 controls the channel selection processing circuit 24 to select a channel having the tuner 3. Then, the control processing unit 23 determines that the video memory control processing circuit 1
By controlling 9 to write the video of one image (one field or one frame) on the selected channel to the video memory 20, and when a predetermined time until the writing ends, The control processing unit 23 controls the tuning processing circuit 24 again so that the tuner 3 tunes to the next channel, and similarly stores the video of the selected channel in the video memory 20 as a sub-video. . In this way, the control processing unit 23 alternately performs the switching control of the channel selected by the tuner 3 and the writing control to the video memory 20, for example, in ascending order of the channel numbers, so that all of the video memory 20 is controlled. The video of the sub-channel is stored in the video memory 20.

During this period, the video memory 20 is not read out, and when the writing to the video memory 20 of all the sub-channels is completed, this is notified by, for example, the detection of the elapsed time by the timer, the above-mentioned channel change, and the video. When the control processing unit 23 detects the number of times writing to the memory 20 is repeated by a counter or the like, the control processing unit 23 controls the video memory control processing circuit 19 to cause the video memory 20 to operate.
To start reading from. As a result, the multi-channel display as shown in FIG.

FIG. 3 shows such a video memory control processing circuit 19
FIG. 3 is a block diagram showing a specific example of the above, where 30 is a buffer memory, 31 is a write control circuit, 32 is a read control circuit, and 3 is a read control circuit.
3, 34 are write address counters, 35, 36 are read address counters, 37, 38 are address selectors, 39
Is a vertical filter, and parts corresponding to those in FIG.

In the figure, when the digitized sub-picture signal Sv from the A / D converter 18 is written in the picture memory 20, the control processing section 23 makes the tuning processing circuit 24 (FIG. 1) as described above. When the tuning channel of the tuner 3 (FIG. 1) is switched by controlling the control signal, a control command is supplied from the control processing unit 23 to the write control circuit 31, whereby the write control circuit 31 starts operating. The write control circuit 31 is
After the operation is started, the vertical synchronizing signal VS1 first supplied from the sub synchronizing signal processing circuit 12 and the horizontal synchronizing signal HS1 following the vertical synchronizing signal VS1 and the reference signal (clock) from the reference signal generating circuit 21 are respectively fetched and written. Address counter 3
3, 34 and the read address counter 35 are operated to count.

On the other hand, the A / D converter 18 digitizes and supplies the sub-picture signal Sv of the channel newly selected by the above-mentioned channel switching.
It is processed by the vertical filter 39.

The vertical filter 39 has a vertical direction of video of 1 / n (here, as shown in FIG. 2, since three sub-videos are vertically arranged and displayed, each sub-video is vertically displayed. It is compressed to ⅓ times, so that n = 3), and is composed of a plurality of line memories and arithmetic circuits. For example, n lines are averaged. The image information of n lines is converted into the image information of 1 line by, for example, converting the image information to form 1 line, and the number of lines of 1 image is multiplied by 1 / n.

In the multi-channel display as shown in FIG. 2, the sub-picture is also compressed 1 / n times in the horizontal direction. Such horizontal compression may be performed by setting the reading speed to n times the writing speed when reading from the video memory 20 described later. However, in this case, the frequency of the video signal becomes high, and when the video signal is directly displayed with such a video signal, the displayed sub-video may be glaring. In order to prevent this, the frequency of the sub-picture signal may be lowered, and for example, A / D
The sampling frequency of the converter 18 may be lowered.

When the video data for one line thus generated is output from the vertical filter 39, this video data is supplied from the write address counter 33 via the address selector 37 as the write address signal WA1. Thus, the data is written in the buffer memory 30 having a capacity of one line or more.

When the writing of one line to the buffer memory 30 is completed, the write control circuit 31 then operates the read address counter 35 and the write address counter 34,
The address selector 37 selects the read address signal RA1 from the read address counter 35. The address selector 38 is in a state of selecting the write address counter 34 side until writing to the video memory 20 is completed.

Therefore, the video data for one line stored in the buffer memory 30 is read by the read address signal RA1 from the read address counter 35. The write address signal WA2 supplied from the write address counter 34 through the address selector 38 is the video memory 2
0, and the video data for one line read from the buffer memory 30 is sequentially written to an address of the video memory 20 determined by the write address signal WA2.

In this way, while the video data for one line is being transferred to the buffer memory 30 and being written to the video memory 20, the vertical filter 39 is performing the above-described image compression processing. When the video data for one line is generated again, the video data is transferred to the buffer memory 30 and written to the video memory 20, and thereafter, this operation is repeated and the video of one sub-channel is recorded in the video memory. 20 will be written. When this writing is completed, the control processing unit 23 operates as described above,
Move on to the same write operation for the next sub-channel.

Here, the receivable channels are CH1,
CH3, CH4, CH6, CH8, CH10, CH12
7 channels, one of them becomes the main channel.
It has an area for storing six sub-pictures of areas 1 to 6, and is written in the order of the channels to be written, here, in the order of the channels with the smallest numbers, in the order of areas 1, 2, 3, ....

In FIG. 3, when the writing of all the sub-channels is completed, the control processing section 23 operates the read control circuit 32. With the start of this operation, the write control circuit 31 stops its operation. As a result, writing is not performed in the video memory 20.

When the read control circuit 32 starts its operation,
First vertical sync signal VS from the main sync signal processing circuit 10
The horizontal and vertical synchronizing signals (HS2, VS2) are sequentially taken in from 2, and the reference signal is taken in from the reference signal generating circuit 21, and the main synchronizing signal processing circuit is read from the read address counter 36 from the timing of the first vertical synchronizing signal VS2. The read address signal RA2 is generated in synchronization with the synchronization signals (HS2, VS2) from 10.

The count number of the read address counter 36 corresponds to the three areas of the video memory 20 shown in FIG. As shown in FIG. 4, when the number of addresses in one area is m, the read address counter 36 includes a counter that repeatedly counts 0 to (m-1) and an adder that adds a preset value P in the count value. And the added value of these count value and preset value P becomes the read address signal RA2 of the video memory 20.

Therefore, assuming that the preset value P = 0, the value of the read address signal RA2 repeats 0 to (m-1), so that the three sub-channels written in the areas 1 to 3 in FIG. The image will be repeatedly read. When this read area is R, in this case, it becomes as shown in FIG. Here, the image of CH3 is written in the area 1, and hereinafter, CH3, CH4, CH6, CH8, CH10, CH1 are respectively written in the areas 2, 3, 4, 5, and 6.
If the video of 2 is written, in this case,
The video memory 20 is read so that the multi-channel display as shown in FIG. Further, when the preset value P is changed from 0, for example, the read region R becomes as shown in FIG. 5B (at this time, P <m−1), and at this time, as shown in FIG. 2B. The video memory 20 is read so that such multi-channel display is performed.

As for the preset value P, a preset value control signal is supplied from the control processing unit 23 to the read control circuit 32 in response to the scroll operation of the input operation unit 26, and the preset value of the read address counter 36 is supplied by this control signal. P changes. As the preset value P changes,
As shown in FIG. 5, the read area R in the video memory 20 moves while keeping the width constant, and as a result, the scroll display as described in FIG. 2 is obtained. Of course, if the moving direction of the read area R in the video memory 20 is reversed,
The scroll direction is also reversed.

Further, as described above, the sub-picture is compressed 1/3 times in the horizontal direction, and as shown in FIG.
It is displayed at the right end of the screen 16a. Therefore, in the video memory 20, as shown in FIGS. 6C and 6D, one line is provided for each horizontal scanning period (one line) H of the synchronization signals (VS2, HS2) from the main synchronization signal processing circuit 10. The video data is read minute by minute, and this reading is performed at a speed three times as high as that at the time of writing and in the last ⅓ period of the video period h in the horizontal scanning period H.

The read control circuit 32 shown in FIG.
A switching control signal SW that is at a high level during this reading period is sent to the signal switching circuit 13. As a result, the signal switching circuit 13
1 selects the sub video signal Sv ′ output from the demultiplexer 29 while the switching control signal SW is at the high level in FIG. 1, and the main video signal processing circuit 9 selects the sub video signal Sv ′ while the switching control signal SW is at the low level. Processed main video signal Mv
Select

Incidentally, FIG. 6A shows the sub-synchronization signal (VS1,
HS1) shows several H periods, and FIG. 8B shows a writing period in the video memory 20 for this sub-sync signal. Writing in the video memory 20 is performed every 3H.

As described above, it is possible to scroll the display area of the sub-picture on the TV screen as a whole. Now, assume that the multi-channel display state shown in FIG. If CH6 of the sub-picture is specified by operating the input operation unit 26, as described above, the control processing circuit 23 controls the tuner 2 to select CH6 and the tuner 3 to operate. The signal switching circuit 8 is set to select the channel CH1, and the signal switching circuit 8 selects the video signal of CH6 from the IF processing means 4 as the main video signal Mv and the video signal of CH1 from the IF processing means 5 to the main video signal Sv. To choose as.

Further, the control processing section 23 controls the video memory control processing circuit 19 so as to write the sub video of CH1 in the video memory 20. That is, in FIG. 3, when there is an instruction to write the CH1 sub-picture from the control processing unit 23,
The write control circuit 31 operates to control the write address counters 33 and 34, the read address counter 35, and the like as described above. CH digitized by the A / D converter 18
The video data of the sub-picture 1 is subjected to vertical image compression processing by the vertical filter 39, and then temporarily stored in the buffer memory 30.
C of the video memory 20 after being stored in
The image of H6 is written in the area 3 (FIG. 4) in which the image was stored.

Here, in order to write the image of CH1 in this way, the control processing unit 23 indicates which sub-channel image is stored in each area of the image memory 20 shown in FIG. Data is created and stored in the memory 28 of FIG. 1, and when a sub-channel is designated in multi-channel display, the storage area in the video memory 20 of the video of the designated sub-channel can be grasped from such data. I am trying. In this way, when the area to be rewritten in the video memory is known, the control processing unit 23 also instructs the writing control circuit 31 in FIG. In response to this instruction, the write control circuit 31 presets in the write address counter 34 a value that determines the area to be written in the video memory 20.

In this way, the area 3 in FIG.
It is rewritten with the image of H1. Meanwhile, the read control circuit 3
2 has stopped its operation, and when this rewriting in the video memory 20 is completed, the operation is started by the instruction from the control processing unit 23 and the reading of the video memory 20 is restarted. As a result, the multi-channel display shown in FIG. 2D is obtained.

When the operation for canceling the multi-channel display mode is performed in the display state shown in FIG. 2D, the signal switching circuit 8 is controlled by the control processing unit 23 in FIG.
2 only selectively outputs the video signal of CH6 from the IF processing means 4 as the main video signal Mv.
The normal display mode shown in FIG. When the multi-channel display mode is designated in this state, the writing to the video memory 20 is performed and the multi-channel display shown in FIG. 2 (f) is obtained.

As described above, the sub-pictures are arranged vertically as shown in FIG. 2. However, as shown in FIG. 7, for example, they are arranged horizontally along the lower side of the TV screen 16a. It can also be scrolled horizontally.

However, in the case of the multi-channel display in the horizontal direction as described above, as shown in FIG. 8, although writing is performed for each area, reading is performed at the end 1 / of the vertical scanning period by the main synchronizing signal. In the period of 3, the video data of the horizontal scanning period corresponding to the three regions in the video memory 20 is read out every horizontal scanning period. That is, in FIG. 8, assuming that the read region R is located on the left side of the drawing and covers the regions 2, 3, and 4, the regions 2, 3, and 4 are read from the regions 2, 3, and 4 for each horizontal scanning period of the main synchronization signal. The video information is sequentially read line by line. As a result, FIG.
The display shown in FIG. 8A is obtained, and by changing the preset value P in FIG. 8, it becomes possible to scroll in the horizontal direction as shown in FIG. 7B.

In the scroll display described above,
The scroll speed can be changed by changing the switching speed of the preset value P.

Returning to FIG. 1, the screen display processing circuit 27
It is for generating an additional image of characters, numbers, symbols, figures, etc. to be displayed on the TV screen 16a of the CRT 16 so as to be superimposed on the image, and the display position of the additional image is designated by the control processing unit 23. The signal of the additional image is formed in synchronization with the main synchronization signal from the main synchronization signal processing circuit 10. An example of such an additional image is a channel number or the like.

The channel number may be displayed at the upper right corner of each image as shown in FIG. 2, or as shown in FIG. 9 between the display regions of the sub-images. It is also possible to provide a margin portion and display the channel number on this. The image of the margin in this case is also formed by the screen display processing circuit 27.

The channel number and the image of the blank space must be moved together with the video along with the scroll, but the control processing unit 23 monitors the read operation of the video memory control processing circuit 19. Therefore, the timing of forming the image signal in the screen display processing device 27 may be controlled according to the timing of reading the sub-picture read from the video memory 20.

FIG. 10 is a plan view showing an operation surface of a remote controller as a specific example of the input operation section 26 in FIG. 1, in which numeral 40 is a numeric key, 41 is a direction operation member, 42 is a multi-button, and 43 is an enter key. It is a button.

In the figure, when the multi-channel display mode as shown in FIG. 2 or 7 is set, the multi-button 42 is operated. When scrolling is performed in the multi-channel display mode, in the case of the multi-channel display mode shown in FIG. 2, the upper portion 41a or the lower portion 41b of the direction operation member 41 is pressed. When the upper portion 41a is pressed, the sub-picture display screen scrolls upward as shown in FIG. 2, and when the lower portion 41b is pressed, it scrolls downward. Scrolling continues while being pressed, and the scroll speed can be changed according to the strength with which the upper part 41a or the lower part 41b is pressed.

Further, in the case of the multi-channel display as shown in FIG. 7, the left and right directions of the direction operating member 41 may be similarly pushed.

When the number key 40 of "6" is operated in the multi-channel display state as shown in FIG. 2 (c), as shown in FIG. 2 (d), CH6 becomes the main image and C
H1 can be replaced with a sub-picture, and when canceling the multi-channel display mode, the multi-button 42 is operated again. As a result, C shown in FIG.
The normal display mode of H6 is set.

When the multi-channel display mode is not set, the direction operating member 41 acts as a function key for an operation different from the above.

Although the desired sub-picture is designated by operating the numeric keys 40 here, a cursor key or a decision key for designation is provided so that the desired sub-picture can be designated by the cursor. You can also do it.

Further, the sound output from the speaker (not shown) is of the main channel.

11 and 12 are diagrams showing the display operation of the second embodiment of the scroll display device for television images according to the present invention.

The basic structure of this second embodiment is also the same as that of the first embodiment described above, as shown in FIGS. 1 and 3, etc., and in the following, this first embodiment will be mainly described. Differences from the embodiment will be described.

First, the first difference is that one of a plurality of sub-pictures displayed in the multi-channel display mode (hereinafter, three pieces as in the above case) is displayed as a moving picture.

FIG. 12A shows the case of the normal display mode in which the video of CH4 is displayed as a moving image.
Input operation unit 26 (in FIG. 10, the multi-button 4
When the multi-channel display mode is specified by operating 2), as shown in FIG. 11B, the sub-picture displayed in the center (CH3 picture in this case) is displayed as a moving picture. An outer frame 44 is provided for the sub-picture displayed as a moving picture. The image signal of the outer frame 44 is formed by the screen display processing circuit 27 in FIG. 1 and is combined with the video signal by the video output circuit 14.

The outer frame 44 can be moved up and down as shown in FIGS. 11 (c) and 11 (d). When the outer frame 44 is moved in this way, the outer frame 44 is newly added.
The sub-picture surrounded by (the sub-picture of CH1 in the case of FIG. 11C and the sub-picture of CH4 in the case of FIG. 11D) is displayed as a moving image.

As described above, in order to display a moving image on one sub-channel, the control processing unit 23 in FIG. 1 finishes writing the images of all the channels to the image memory 20, and then, FIG. , (C), (d), the state of the tuner 3 is set so that one of the channels on which the sub-picture is displayed is selected, and the signal switching circuit 8 causes the IF processing stage 5 to operate. The video signal output from is selected and output as the sub video signal Sv. Then, the control processing unit 23 controls the video memory control processing circuit 19 so that the sub video signal is always written in the corresponding area of the video memory 20.

When moving the outer frame 44, the sub-picture cannot be scrolled. Therefore, in the remote controller shown in FIG.
When the multi-channel display mode of 1 (b) is set and the upper portion 41a or the lower portion 41b of the direction operation member 41 is pressed, the outer frame 44 moves up and down.

Further, the outer frame 44 cannot move above the displayed top sub-picture position, and cannot move below the displayed bottom sub-picture position.
Even if the outer frame 44 moves to its movement limit, if the direction operating member 41 in FIG. 10 is continuously operated, then the sub-picture scrolls in the opposite direction. FIG. 11 (e) shows a state in which the outer frame is set to the lower limit portion. When the direction operating member 41 is operated in this state, FIGS. 11 (f), (g),
As shown in (h), the sub-picture scrolls upward.

The second difference from the first embodiment described above is that in the first embodiment, scrolling is performed continuously as described with reference to FIG. Two
In the embodiment, as is apparent from FIGS. 11 (e) to 11 (h), scrolling is performed discontinuously for each screen of the sub-picture. As a result, the displayed sub-picture and the outer frame 4
I am trying not to shift from 4.

In order to perform such discontinuous scrolling, the preset value P in the read address counter 36 described with reference to FIGS.
The number of addresses “m” in each area shown in FIG. 4 may be discontinuously changed.

The third difference from the first embodiment described above is that, among the displayed sub-pictures, only the sub-channels surrounded by the outer frame and displaying the moving picture can be replaced with the main channels. Is.

FIG. 12 is an explanatory diagram of a case where a desired sub-channel is replaced with the main channel. When the sub-channel in the outer frame 44 is designated in the display state shown in FIG. 11 (h), it is displayed in FIG. 12 (a). As shown, the same image as the image in the outer frame is displayed as the main image. Then, by canceling the multi-channel display mode, FIG.
As shown in, the normal display mode is displayed in which only the video of the new main channel is displayed.

Therefore, in the second embodiment, in order to set the desired sub-channel as the main channel, the outer frame 44 is placed in the sub-image display area so that the image of the sub-channel is placed in the outer frame 44. Move to the uppermost position or the lowermost position and fix it, and then scroll so that the image of the desired sub-channel is placed in the outer frame 44, and then, indicate that sub-channel. , The outer frame 44 can be moved up and down to select one of the three currently displayed sub-pictures.

In addition to the designated function, the numeric keypad 40 of the remote controller is used as in the first embodiment described above.
By the operation of (FIG. 10), the sub-channel outside the outer frame 44 may be designated as the main channel only in the sub-channel in which the sub-picture is displayed.

The remote controller for the second embodiment is also shown in FIG.
The configuration shown in FIG. 0 can be adopted. In this case, the outer frame 44 is also moved by the operation of the direction operation member 41, and even if the outer frame 44 cannot be moved as shown in FIGS. When the direction operation member 41 is operated, the sub-picture is scrolled. And FIG.
When it is desired to set the sub-channel of CH10 as the main channel in the display state shown in (h), the enter button 43 of the remote controller shown in FIG. 10 is pressed. As a result, the image of CH10 is displayed as the main image as shown in FIG.

In the operation of the second embodiment, in the display state shown in FIG. 11 (h), the main channel CH4 is selected by the tuner 2 in FIG. 1 as described above. , CH, which is the sub-channel for displaying moving images
The tuner 10 has been selected by the tuner 3. In this state, if the remote controller is operated with CH10 as the main channel, the control processing unit 23 controls the channel selection processing circuit 25 so that the channel selected by the tuner 2 is equal to the channel selected by the tuner 3.
Set to 0. As a result, the main video signal Mv output from the signal switching circuit 8 becomes the video signal of CH10. At this time, the sub video signal Sv output from the signal switching circuit 8 is also the video signal of CH10, and therefore the display state shown in FIG. 12A is obtained.

In the second embodiment, as described above, only the sub-picture displayed in the outer frame 44 can be designated as the main picture, and all the channels are set as the main channels. All channels that are received are secondary channels because they must be able to do so.

FIG. 13 is a flow chart showing the operation of the second embodiment described above.
The enter button and the numeric key are respectively the operation member 4 in FIG.
2, 41, 43, 40. In addition, in FIG.
The operation excluding the steps S9, S10 and S6 represents the operation of the first embodiment described above.

Also in the second embodiment, the sub-pictures may be arranged in the horizontal direction as in the case shown in FIG.

In the first and second embodiments described above, in FIG. 1, from the input terminals 6 and 7, for example,
The image information of an external device such as a personal computer or a facsimile is stored in the video memory 20 as a still image.
Similar to the embodiment described above, it can be displayed as a sub-picture.

FIG. 14 shows a display example in this case, and FIG. 14A shows a state in which three pieces of stored information are fixedly displayed. The video memory 20 of FIG. 1 can store three or more pieces of image information, and if the user wants to see other image information, he / she operates the input operation unit 26 (FIG. 1) as in the previous embodiment. Then, as shown in FIG. 14B, scrolling may be performed. Therefore, as shown in FIG.
You can see other image information.

In order to write the image information in the video memory 20 as described above, in FIG. 1, the output image signal of the external device is input from at least one of the input terminals 6 and 7, and the input operation section 26 is operated. By doing so, the signal switching circuit 8 selectively outputs this image signal as the main video signal Mv and the sub video signal Sv. This gives C
An image based on this image signal is also displayed on the TV screen of the RT 16, and if there is a necessary image while watching this, the control processing unit is operated by operating the input operation unit 26 to instruct the control processing unit 23 to take in the image. Reference numeral 23 controls the video memory control processing circuit 19 to write the image information at that time into the video memory 20. In this way, necessary image information is sequentially written in the video memory 20.

In this case, in the video memory 20, the area for storing the video of the reception channel from the tuner 3 as a sub video and the area for storing the image information from the external device input to the input terminals 6 and 7 are different. However, it is not always necessary that they be the same area.

In each of the embodiments described above, PinP
Although the main video and the sub video are displayed in the multi-channel display mode, they may be displayed in PoutP.
In this case, however, in FIG. 1, for example, the main video signal processing circuit 9 is also provided with a memory means for video compression to compress the main video in the multi-channel display mode. In this case, of course, the synchronization signal supplied to the deflection circuit 15 and the video memory control processing circuit 19 must be synchronized with the main video signal output from the main video signal processing circuit 9.

[0101]

As described above, according to the present invention,
Even if only some of the program contents of all receivable channels are displayed, it can be confirmed by scrolling with a simple operation, and the program display of the channel currently being viewed can be prevented. Without this, it is possible to easily confirm the program contents of all other channels.

Further, according to the present invention, at least one of the displayed sub-channels is displayed as a moving image, and the sub-channel for displaying the moving image can be arbitrarily selected, so that the program display of the channel currently being viewed can be prevented. The program contents of all other channels can be confirmed easily and in more detail.

Further, according to the present invention, when the sub-channel is desired to be viewed, it is only necessary to specify the sub-picture of this sub-channel displayed on the screen, and therefore the operation for switching this channel is very simple. Become.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a scroll display device for television images according to the present invention.

FIG. 2 is a diagram showing a specific example of multi-channel display and scroll display thereof in the first embodiment shown in FIG.

3 is a block diagram showing a specific example of a video memory control processing circuit in FIG.

FIG. 4 is a diagram schematically showing a recording area of a sub-picture in the picture memory shown in FIG.

5 is an explanatory diagram showing a read operation of a video memory for scroll display shown in FIG. 2. FIG.

6 is a timing diagram showing write and read operations in the video memory shown in FIG.

FIG. 7 is a diagram showing another specific example of multi-channel display and its scroll display in the first embodiment shown in FIG.

8 is an explanatory diagram showing a read operation of a video memory for scroll display shown in FIG. 7. FIG.

FIG. 9 is a diagram showing still another specific example of the multi-channel display in the first embodiment shown in FIG.

10 is a plan view showing an operation surface of a remote controller as a specific example of the input operation unit in FIG.

FIG. 11 is a diagram showing outer frame movement and scrolling on the display screen of the second embodiment of the scroll display device of the television image according to the present invention.

FIG. 12 is a diagram showing on the display screen the conversion operation of the sub-channel to the main channel following FIG. 11.

FIG. 13 is a flowchart showing the operation of the second embodiment of the television video scroll display device according to the present invention.

FIG. 14 is a diagram showing display contents and a scroll operation of a third embodiment of the scroll display device for television images according to the present invention.

FIG. 15 is a diagram showing an example of conventional multi-channel display of television images.

FIG. 16 is a diagram showing a conventional scroll display.

[Explanation of symbols]

 2, 3 Tuner 8 Signal switching circuit 9 Main video signal processing circuit 11 Sub video signal processing circuit 13 Signal switching circuit 16 CRT 16a TV screen 18 A / D converter 19 Video memory control processing circuit 20 Video memory 22 D / A converter 23 Control Processing Section 24, 25 Channel Selection Processing Circuit 26 Input Operation Section 27 Screen Display Processing Circuit 30 Buffer Memory 39 Vertical Filter 40 Numeric Key 41 Directional Operation Member 42 Multi Button 43 Enter Button 44 Outer Frame

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shingo Utsuki 1-280 Higashi Koigakubo, Kokubunji, Tokyo Inside Hitachi Design Laboratory (72) Inventor Yasuhiro Kasahara 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Stock company Information & Video Division, Hitachi, Ltd.

Claims (5)

[Claims] 1. A television receiver for receiving a video signal of a broadcast program and displaying the video of the received program on a screen, first and second receiving means for receiving the video signal of the broadcast program, and the first receiving means. Selecting means for selecting one of the video signals received by the second receiving means as a main video signal and selecting the other video signal as a sub video signal, and a plurality of receiving means by the first and second tuning means. Memory means to which a video storage area is assigned for each channel, writing means for writing video of different channels of the sub-video signal to the corresponding storage areas of the memory means, and the entire storage area of the memory means A read means for setting a read area for an integer number of storage areas smaller than the write area, making the read in the read area faster than at the time of writing, and moving the read area on the memory means; The reading means A video signal read from the memory means is combined with the main video signal to display an image, the video of the main video signal is used as a main video, and the video of a plurality of channels read by the reading means is sub-displayed, respectively. As the image, the main image and a plurality of sub-images are displayed on the screen,
A scroll display device for a television image, characterized in that the entire display areas of the plurality of sub-pictures are scrolled so that all the sub-pictures stored in the respective storage areas of the memory means appear on the screen in order. . 2. The scroll display device for television video according to claim 1, wherein all the video stored in the memory means are still images. 3. The at least one included in the read area of the storage area of the memory means according to claim 1, wherein a sub-picture signal is constantly written and displayed on the screen. A scroll display device for a television image, wherein the sub-image is a moving image. 4. The television video scroll display device according to claim 3, wherein the sub-image of the moving image display is surrounded by a frame image. 5. The means for designating one of the sub-pictures displayed on the screen according to claim 1, 2, 3 or 4, wherein the video signal of the designated channel of the sub-picture is used as a main video signal. A scroll display device for a television image, comprising: a switching unit.