JPH10145699A - Multi-screen display television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow the broadcast contents to be confirmed for all channels by displaying the number of non-displayed channels and executing the multi- screen display mode automatically at application of power. SOLUTION: A control section 20 selects periodically a multi-screen use tuner 12 when the multi-screen display mode is not set, receives a video signal of each channel from a video signal processing circuit 13 and detects a synchronizing signal in an input signal to discriminate whether or not a broadcast program through this channel and the discrimination result is stored in a control data storage memory 21. When the multi-screen display mode is set (executed), the control section 20 reads data in the control data storage memory 21 to display a program of broadcast channel on multi-screen display and controls each circuit so as to display the number of broadcast channels not displayed onto the screen. Furthermore, the control section 20 executes the multi-screen display mode automatically when detecting application of power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-screen display television receiver capable of simultaneously displaying an image based on a plurality of channels. In addition, the present invention relates to a multi-screen television receiver suitable for simplifying operation by a viewer and improving operability.

[0002]

2. Description of the Related Art In recent years, in electronic devices such as color television receivers, with the diversification of video information, for example, video processing circuits for converting video signals into digital signals and performing video processing have been digitized. I have.

As described above, by digitizing the video processing circuit, for example, the image quality is improved, and a function of displaying a screen such as a parent-child screen (two-screen display), a multi-screen, and a still image reproduction by applying a memory is used. Can be added. In addition, support for Videotex, teletext (text multiplex broadcasting), personal computers, and the like has been expanded, and it is possible to easily configure a device system based on digital processing signals.

Recently, a video processing circuit for performing such digital processing has been adopted to provide a multi-screen display function (hereinafter, referred to as a multi-screen display function) having two or more screens. Screen display color television receivers (hereinafter abbreviated as multi-screen display television receivers) have become widespread.

In such a multi-screen display television receiver, when displaying two screens, as shown in FIG. 6, for example, the display screen 18a is divided into two parts, one of which is a main screen 19,
The other is used as the sub-screen 20 to display images based on the channels selected by the multi-screen tuner (a tuner having at least two or more tuner units).

When displaying all the screens of all broadcast channels at one time (also referred to as multi-display), for example, an image based on a channel selected by a multi-screen tuner on the sub-screen 20 is used as a still image. Display sequentially. This allows the viewer to recognize the broadcast content based on the channel being broadcast through a plurality of still images.

FIG. 6 shows an example of a screen display when a multi-screen display is performed as described above. That is, as shown in the illustrated example, the sub-screen 20 on the display screen 18a (the screen of the color television receiver 18) displays the still images 1 to 9 based on each broadcast channel. In this case, nine still images are displayed by one operation. In other words, the control unit in the television receiver controls the multi-screen tuner sequentially to select nine channels at predetermined time intervals, and displays images based on the selected channels, for example, sequentially in the sub-screen 20. To be displayed.

[0008] As described above, the still image is displayed on the sub-screen 20 on multiple screens when a program is being broadcast through the transmission channel. For this reason, it is necessary to detect whether each program is broadcast via each transmission channel. Therefore, by detecting the presence / absence of broadcasting on each channel in this manner, it is possible to display a still image corresponding to the number of broadcast channels on a multi-screen.

Normally, in a conventional multi-screen display television receiver, when a multi-screen display is performed, each time the multi-screen display mode is turned on, it is determined whether or not a program is being broadcast on each channel. Is detected. That is, the presence / absence of broadcasting is detected when the multi-screen display mode is on, and if the channel is being broadcast, a still image based on each channel is displayed in the display mode shown in FIG. I am trying to do it.

However, in the above conventional multi-screen display television receiver, the presence or absence of broadcast for each channel is detected when the multi-screen display mode is turned on.
For example, as shown in FIG. 6, it takes a considerable amount of time until nine still images are displayed on a multi-screen, and the viewer waits a predetermined time to check the program contents according to the channel being broadcast. There is a disadvantage that it must be done.

If the number of channels being broadcast is larger than the number of channels that can be displayed on the sub-screen 20 shown in FIG. 6 (for example, 9 channels), the viewer is further displayed. A new operation for displaying each still image on a multi-screen according to the number of remaining channels (the number of undisplayed channels) is required, and the conventional device detects the number of such undisplayed channels. Since no detecting means is provided, there is also an inconvenience that the operation becomes complicated as described above in order to confirm the broadcast content according to the number of all broadcasted channels.

As described above, the multi-screen display function is used by the viewer as a means for confirming the broadcast contents of each channel. In particular, when the power of the television receiver is turned on, the programs of all the channels are used. There is a need to confirm. However, the conventional device does not have a function for automatically displaying a multi-screen when the power is turned on. Even when the power is turned on, the operation for executing the multi-screen display mode as described above must be performed. However, there is a problem that it is troublesome and it takes time to confirm all programs.

[0013]

As described above, in the conventional multi-screen display television receiver, the detection of the presence or absence of the program broadcast for each channel required for multi-screen display is performed.
Since the operation is performed when the multi-screen display mode is turned on, there is an inconvenience that it takes time to display a still image based on a broadcast channel. In addition, if the number of broadcast channels is larger than the number of channels that can be displayed on multiple screens, re-operation is necessary, and since there is no means for detecting and displaying the number of undisplayed channels, Similarly, a complicated operation is required to confirm the broadcast contents corresponding to all the channels. Furthermore, in order to check the broadcast content based on all the channels, it is desirable to execute the multi-screen display function immediately upon turning on the power. However, this cannot be performed with the conventional technology, and the complicated operation described above is required. As a result, there is a problem that the time required for executing the multi-screen display is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made to increase the execution speed of multi-screen display, to enable display of the number of undisplayed channels, and to automatically set a multi-screen display mode when power is turned on. The object of the present invention is to provide a multi-screen display television receiver capable of improving operability and confirming the broadcast contents based on all the channels by executing.

[0015]

A multi-screen display television receiver according to the present invention selects a channel from a plurality of channels and receives a television signal of the selected channel. Channel selecting means, a video signal processing means for performing predetermined signal processing on a television signal received by the multi-screen display tuning means and outputting the processed signal, and a multi-screen display compressed by the video signal processing means. Storage of video signals for multiple channels required for
A first storage unit capable of reading, a second storage unit capable of storing and reading compressed video signals for a plurality of channels from the video signal processing unit and the first storage unit, An output processing unit that performs processing for displaying the video signal read from the second storage unit and outputs the processed video signal; a display unit that displays a video based on the video signal from the output processing unit on a screen; A third storage unit for storing information indicating the presence or absence of a broadcast obtained for each channel selected by the multi-screen display channel selection unit, and displaying the character information created based on the information on the display unit; On-screen display means for superimposing display on a screen, and periodically selecting the multi-screen display tuning means and controlling storage and reading of video signals to and from the first and second storage means. Control means for displaying a multi-screen, wherein a video signal from the video signal processing means is input to determine the presence or absence of broadcasting for each channel, and the determination result is stored in the storage means of the third as the information. In addition, when performing multi-screen display, the on-screen display means to display on the screen the number of undisplayed channels obtained by counting the number of broadcast channels that are not displayed on the multi-screen from the read information, And control means for controlling.

In the present invention, the multi-screen display tuning means selects one of a plurality of channels and receives a television signal of the selected channel. The video signal processing means performs predetermined signal processing on the television signal received by the multi-screen display tuning means and outputs the processed signal. The predetermined signal processing is, for example, normal amplification processing and detection processing, or compression processing of a video signal necessary for multi-screen display. The first storage means is capable of storing and reading out video signals of a plurality of channels necessary for multi-screen display, which are compressed by the video signal processing means, and are directly reflected on the screen display. Is not memory. The second storage means is capable of storing and reading out compressed video signals of a plurality of channels from the video signal processing means and the first storage means, and is directly reflected on a screen display. Memory. The output processing means performs a process for displaying the video signal read from the second storage means and outputs the processed video signal;
The display means displays an image based on the image signal from the output processing means on a screen. On the other hand, the third storage means stores information indicating the presence or absence of a broadcast obtained for each channel selected by the multi-screen display tuning means,
The on-screen display means is for superimposing and displaying character information created based on the information on a display screen of the display means. Here, the control means periodically controls the multi-screen display tuning means and selects the first and second multi-screen display tuning means.
By controlling the storage and readout of the video signal to the storage means, the control means for multi-screen display, input the video signal from the video signal processing means to determine the presence or absence of broadcasting for each channel, When the determination result is stored as the information in the third storage means, and the multi-screen display is performed, the number of undisplayed channels obtained by counting the number of broadcast channels not displayed in the multi-screen from the read information is calculated. The on-screen display means is controlled so as to be displayed on a screen. Thereby, the presence / absence of broadcast of each channel can be determined in advance, and the determination result can be stored. Therefore, when the multi-screen display mode is executed, the still images of all broadcast channels can be immediately displayed on the multi-screen. .

[0017]

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

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

In the present invention, the main screen and the sub-screen can be simultaneously displayed, and the first screen for receiving the image of the main screen is provided.
And a second tuner for receiving the video of the sub-screen, and when only the main screen is displayed on the entire screen, the video selected by the first tuner is displayed;
When the main and sub screens are displayed, the images selected by the first and second tuners are displayed. Further, the second tuner can sequentially switch the receiving channel at a fixed cycle, and displays the sub-screen on a multi-screen (FIG. 6).
9 screen display).

In FIG. 1, the first tuner for the main screen and the video processing circuit for the main screen are not shown, and the sub-screen processing is mainly shown.

As shown in FIG. 1, a television signal (high-frequency television RF signal) induced in the antenna 11
Is supplied to the multi-screen tuner 12, and the multi-screen tuner 12 is controlled so that the channel selection is controlled by the control unit 20 (a microcontroller, which may be described as a microcomputer hereinafter). Has become. That is, in the case of multi-screen display, for example, the first tuner (main-screen tuner) is used to select a main channel to be displayed on the main screen 19 (see FIG. 6) of the divided screen. At the same time, the tuner 12 is used to sequentially select a plurality of channels to be displayed on the sub-screen 20 (see FIG. 6).

Therefore, the multi-screen tuner 12 selects a channel based on the channel switching control signal from the control unit 20, that is, selects a signal of a predetermined channel from the RF signals and outputs a video intermediate frequency signal. After that, it is supplied to the video signal processing circuit 13.

The video signal processing circuit 13 amplifies the supplied video intermediate frequency signal, and then performs a detection process to change the baseband video signal to the changeover switch 1.
4 (hereinafter abbreviated as SW14) and output terminal a and control unit 20
To supply.

The SW 14 selects one of the input terminal B1 and the input terminal B2 based on the switching control signal from the control unit 20, and sends the input baseband video signal from the output terminal a to the selected input terminal. Supply.

A first video memory 15 is connected to the input terminal B2 of the SW 14, and a second video memory 16 is connected to the other input terminal B1.

The first video memory 15 is a memory that is not directly reflected on the screen, and the reading and the storing are controlled based on a control signal from the control unit 20, and the input terminal B2 of the SW 14 When the baseband video signal is compressed and stored as multi-screen still image data, and the readout is performed, the readout data is supplied to the second video memory 16.

The second video memory 16 is a memory for directly reflecting on a screen, and compresses a baseband video signal from an input terminal B 1 of the SW 14 based on a control signal from the control unit 20 to perform multi-screen use. The data signal is stored as still image data and the data signal supplied from the first video memory 15 is stored. Then, the second video memory 16
Supplies the stored data signal to the output processing circuit 17.

The output processing circuit 17 converts the supplied data signals into red (R), green (G), and blue (B) color signals (RGB signals) by, for example, an RGB matrix circuit.
, And then supplied to the picture tube 18 to obtain R
An image based on the GB signal is displayed on the screen of the picture tube 18.

The OSD display circuit 19 (also referred to as an on-screen display circuit) receives a display signal (OSD display) for on-screen based on a control signal from the control unit 20.
A display signal is generated and supplied to the picture tube 18. In this case, when the OSD signal is supplied from the OSD display circuit 19, the picture tube 18 displays on-screen characters, figures, and the like based on the OSD display signal on an image based on the RGB signal.

On the other hand, the control unit 20 normally receives a remote control signal from a remote control 22 as input operation means, and controls each circuit to perform processing based on the received remote control signal. The remote controller 22 is provided with, for example, a power button 22a for turning on / off the power of the multi-screen television receiver 10 and a multi-button 22b for executing the multi-screen display mode. When the viewer executes the normal multi-screen display mode, by pressing the multi-button 22b, a remote control signal for executing the multi-screen mode is supplied to the control unit 20.

In the present embodiment, the control unit 20
While the multi-screen display mode is off, the multi-screen tuner 12 is periodically switched, and the baseband video signal of each channel is received from the video signal processing circuit 13. Then, by detecting the synchronization signal in the input signal, the control unit 20 determines whether or not the program is being broadcast on this channel, and supplies the determination result to the control data storage memory 21. Remember. The determination result to be stored is, for example, as shown in the figure (control data storage memory 21).
As shown in (2), the presence or absence of a broadcast determined for each channel number is stored as data.

On the other hand, when the viewer presses the multi-button 22b of the remote controller 22 to turn on (execute) the multi-screen display mode, the control unit 20 transmits the data in the control data storage memory 21 Each circuit is controlled so that the read and broadcast channels are displayed on the multi-screen only, and the number of undisplayed channels in the broadcast channels are displayed on the screen. Accordingly, while the multi-screen display mode is off, it is possible to determine the presence or absence of the broadcast of the channel that is periodically selected, and it is possible to obtain data necessary for use in executing the multi-screen display mode. .

Further, when the control section 20 detects that the power of the multi-screen display television receiver 10 shown in FIG. Multi button 2
Control is performed so that the multi-screen display mode is automatically executed without pressing the button 2b. At this time, the control unit 20 controls each circuit so that a still image based on all the channels being broadcast is displayed on a multi-screen for a certain period of time after the power-on is detected. As a result, even if the viewer does not know the channel based on the desired program, the latest still images based on all the channels being broadcast are displayed on a multi-screen, so that the broadcast contents on all the channels can be immediately confirmed. It is possible to do.

The operation for turning on / off the multi-screen display mode and turning on the power can be performed not only by the remote controller 22 but also by using a main body operation unit provided on the main body. It is.

Next, a specific example of the control operation in the control unit 20 will be described in detail with reference to FIGS.

FIG. 2 shows an example of a flowchart for the control unit 20 to determine the presence or absence of broadcasting on each channel.

First, a description will be given of a control example in which the control unit 20 determines whether or not each channel has a broadcast.

First, in the process of step S30, the control unit 20 registers (not shown) a channel for storing a channel of the multi-screen tuner 12 (hereinafter abbreviated as "tuner"). Is provided in the control unit), and in the process of step S31, it is determined whether or not the multi-screen display is being performed at regular intervals. S33
Otherwise, after waiting for a predetermined time in step S32, the process is returned again to determine whether or not multi-screen display is being performed.

When it is determined that the multi-screen display is off, the control unit 2
0 is the process in step S33, and the CH of the tuner 12
Is controlled based on the value of the register storing the tuner 12, and at the same time, the received signal output from the tuner 12, that is, the video signal processing circuit 13 is By detecting the synchronization of the baseband video signal supplied via the PC, it is determined whether the program is being broadcast or not.

Then, the control unit 20 executes the process in step S
The process proceeds to S35, where the determination result obtained in step S34 is stored in the control data storage memory 21 at a location corresponding to the value of the register indicating the CH of the tuner 12. In this case, the control unit 20 determines from the data in the control data storage memory 21 by the processing in step S36.
Counts the number of channels being broadcast and stores C in the register for the counter.
The number of H is set, and then the value of the register for storing the number of channels of the tuner 12 is incremented by the processing in step S37. Then, the process proceeds to step S38.

Then, in the process of step S38, the control unit 20 determines whether or not the check has been completed for all the channels. If not, the process returns to step S31, and it is determined that the check has been completed. If it has, the process returns to step S30 after waiting for a certain time in step S39.

Therefore, by repeating the above-described processing routine until all the channels are checked, the control unit 20 can grasp the latest broadcast state of each channel and the number of channels being broadcast. become. As a result, it becomes possible to determine whether or not each channel has broadcast, which has been performed after executing the multi-screen display mode, before executing the multi-screen display mode,
In addition, since the determination is made at regular intervals, the latest information required when executing the multi-screen display mode can be obtained.

Next, an example of the control operation of the control unit 20 when the multi-screen display mode is being executed will be described in detail with reference to FIG.

FIG. 3 is a flowchart showing an example of the circuit control operation of the control unit 20 when the multi-screen display mode is on.

Now, it is assumed that the multi-screen television receiver 10 shown in FIG. 1 executes the multi-screen display mode by pressing the multi button 22b of the remote controller 22. Then, as shown in FIG. 3, the control unit 20 first performs step S
In the process by 40, it is determined whether or not the check of the CH has been completed. If it is determined that the check has not been completed,
In the process in step S41, the viewer is made to recognize that the broadcast content of the channel is being read, and then the process proceeds to step S41.
After waiting for a certain time at 42, the process returns to step S40 again. On the other hand, if it is determined that the CH check has been completed, the process proceeds to step S43.

The control unit 20 controls to clear the value of the register storing the channel of the tuner 12 in the process of step S43, and then executes the broadcast of the channel corresponding to the register in the process of step S44. The presence / absence is controlled to be read from the control data storage memory 21. Then, the control unit 20 determines whether or not there is a further broadcast in step S45, and if it is determined that there is a broadcast, the tuner 12 and the SW1 are processed in the next step S46.
4 is switched, that is, N (in the display example shown in FIG. 6, nine) video signals of the
The control signal is supplied to the tuner 12, the video signal processing circuit 12, and the SW 14 so as to output the video signal to the video memory 16. For this reason, the video signal supplied to the second video memory 16 is compressed and stored in the second video memory 16 as still image data. Thereafter, the video signal from the second video memory 16 is displayed on the screen 18 of the picture tube 18 via the output processing circuit 17.

At the same time, the control unit 20 calculates the number of undisplayed channels and controls the OSD display circuit 19 to display the remaining channels on the screen 18 a of the picture tube 18. Specifically, the control unit 20 counts up the value of the register in the process in step S47, and then checks in the process in step S48 whether a still image based on N channels is displayed. Is performed, and if N CHs are not displayed, the process proceeds to step S49. In this process, C
It is determined whether all the displays have been performed. If not, the process returns to step S44. If the displays have been performed, the process proceeds to step S52.

In the determination at step S48, N CHs
If the display is made, the number of remaining channels is calculated based on the counter storing the number of broadcasting channels in the process in step S50, and the OSD is displayed in step S51 so as to display the remaining number of channels. An instruction (control signal) is given to the circuit 19. As a result, as described above, the number of undisplayed channels is displayed on the screen 18a of the picture tube 18, for example, as shown in FIG.
0a (black band portion) is displayed in a display form of "remaining OOCH".

Thereafter, the control unit 20 performs processing in the same procedure as that of the conventional multi-screen display television receiver. That is,
The control unit 20 writes the latest video of the previous channel previously output to the second video memory 16 as still image data in the first video memory 15 in the process of step S52, and further performs the first video in step S53. Each time the writing of the still image data to the video memory is completed,
The data written in the first video memory 15 is controlled to be transferred to the second video memory 16. In this way, the data in the still image is updated to display the latest still image on multiple screens.

Thus, when the multi-screen display mode is turned on, multi-screen display can be performed immediately, and the number of undisplayed channels can be displayed on the screen. Information at the time of executing the screen display mode can be immediately recognized.

Next, during execution of the multi-screen display mode (while on)
An example of the display channel switching control operation of the control unit 20 in the above will be described with reference to FIG.

FIG. 4 is a flowchart showing the display channel switching control operation of the control unit during execution of the multi-screen display mode. In the processing procedure shown in FIG. 4, the same processing steps as those shown in FIG. 3 are denoted by the same reference numerals, description thereof will be omitted, and only different parts will be described.

Now, the multi button 22b of the remote control 22
It is assumed that the multi-screen display mode has been executed by pressing. Then, in the process of step S60, the control unit 20 determines whether or not there is a number of undisplayed channels, and if not, terminates the process assuming that still images based on all channels are displayed on multiple screens. If there is an undisplayed number of channels, the process proceeds to step S61.

In the processing in step S61, the control unit 2
0 reads from the control data storage memory 21 the presence / absence of broadcasting of the corresponding CH from the value of the register storing the channel of the tuner 12 and then performs a process to determine whether or not there is broadcasting in step S45. Do. Thereafter, the control unit 20 performs control such that processing is performed in the same manner as in the control flowchart illustrated in FIG. 3 as described above.

Thus, even if the multi-screen display mode is being executed, if the broadcast channel is not displayed, it is possible to control to surely display a still image based on the undisplayed channel. Since it is possible, the viewer can surely confirm that all the channels are not broadcast.

By the way, in the multi-screen display television receiver 10 of the present invention, when the power is turned on, the multi-screen display mode is automatically set even if the viewer does not perform an operation for executing the multi-screen display. It is also possible to check the broadcast contents of all the channels by executing the program. Such an embodiment will be described with reference to FIG.

FIG. 5 is a flowchart showing an example of a multi-screen automatic display control operation by the control unit when the power is turned on.

Now, it is assumed that the viewer presses the power button 22a of the remote controller 22 shown in FIG. 1 to turn on (turn on) the power of the multi-screen display television receiver 10. Then, the control unit 20 first determines in the processing in step S70 whether or not to perform the multi-screen display when the power is turned on, based on the setting as to whether or not to execute the multi-screen display set in advance by the viewer. If the setting is not performed by the viewer, the process is terminated, and if the multi-screen display mode is to be executed, the process proceeds to step S71.

The control unit 20 clears the register for storing the channel of the tuner 12 in the processing in step S71, and then resets the value stored in the register to the value for channel selection in the processing in step S72. On the basis of,
The control by the tuner 12 is controlled so as to be sequentially switched. Then, in the process in step S73, the tuner 1
Checking the synchronization of the output from the second, that is, the output video signal from the video signal processing circuit 13, determines whether or not the broadcast is being performed. At this time, when it is determined that there is a broadcast, the control unit 20 shifts the processing to step S74, and when there is no broadcast, shifts the processing to step S35.

If it is determined that a broadcast is present at the tuner 12 output, the SW 14 is switched to the input terminal B in the processing in step S74.
At the same time, control is performed such that the video signal supplied from the tuner 12 and the video signal processing circuit 12 is written to the second video memory 16 as still image data.
In other words, N video signals (9 in the display example shown in FIG. 6) of the channels for which broadcast is
, The tuner 12 and the video signal processing circuit 1
2 and a control signal to SW14. Therefore, the second
The video signal supplied to the video memory 16 is compressed,
The data is stored in the second video memory 16 as still image data. After that, the video signal from the second video memory 16 is output to the screen 18 a of the picture tube 18 via the output processing circuit 17.
Displayed above.

Then, the control unit 20 executes the processing in step S
35, the determination result obtained in step S73, that is, the presence / absence of broadcasting is determined by the control data storage memory 2.
1 is stored in a location corresponding to the value of the register indicating the CH of the tuner 12. In this case, the control unit 20 determines that the control data storage memory 21
From the above data, the number of CHs being broadcast is counted, and the number of CHs is set in a counter register.
In the process by 37, the value of the register storing the number of channels of the tuner 12 is incremented. Then, the process proceeds to step S48.

Thereafter, the control unit 20 determines whether or not a still image based on the N CHs is displayed in the process in step S48, and if so, the process proceeds to step S75. If not, the process proceeds to step S38. Step S38
It is determined whether or not the check has been completed for all the channels. If not, the process returns to step S72. If it is determined that the check has been completed, the process waits for a predetermined time in step S39. After doing
In step S87, the multi-screen display mode is turned off,
The process ends.

On the other hand, in step S48, N C
If it is determined that a still image based on H is being displayed, the control unit 20 performs processing from step S75 to step S80 in the same manner as the processing procedure from step S72 to step S37 described above. Control.
That is, data that is displayed for multi-screen display one hour after the power is turned on (still image data and the result of determining whether broadcast is present)
Perform processing to obtain.

Thereafter, the control unit 20 returns to step S8
At 1, it is determined whether or not a still image based on N CHs is displayed.
After waiting for a certain period of time at 82, step S83
In the second video memory 16, the first video memory 1
5 to transfer the data stored therein.
As a result, the latest still image of each channel is displayed on the screen 18a of the picture tube 18 after a certain time from the point of time when the multi-screen is displayed at the same time when the power is turned on. After that, the control unit 20 returns the process to step S75 so as to perform the control until the still images based on all the CHs are displayed.

If the still images based on the N CHs are not displayed in the processing in step S81, whether the still images based on all the broadcasted CHs are displayed in step S84. It is determined whether or not it is not displayed, and if it is determined that it is not displayed, the process returns to step S75 again.

Conversely, if it is determined that the video is displayed, the control unit 20 waits for a predetermined time in step S85, and then stores the first video in the second video memory 16 in step S86. Control is performed to transfer data stored in the memory 15. Thereby, the picture tube 1
On the screen 18a of FIG. 8, the latest still image of each channel is displayed after a certain period of time from the time when the multi-screen is displayed at the same time when the power is turned on.

Thereafter, the controller 20 waits for a predetermined time in step S39, then automatically turns off the multi-screen display mode in step S87, and ends the multi-screen automatic display control.

Therefore, in the present embodiment, when the power is turned on, the multi-screen display mode is automatically activated by the control unit 20, and all channels being broadcast at that time are set to N channels (9 channels in FIG. 6). ) Is displayed for a certain period of time, and when still images based on all channels are displayed,
The multi-screen display mode can be automatically turned off. Thus, at the same time as the power is turned on, the still images of all the broadcasted channels can be automatically displayed. As a result, it is particularly effective for viewers who want to check the broadcast content of each channel at the same time as turning on the power, and can improve the operability, and the user-friendly multi-screen display television that satisfies the viewer. A receiver can be provided.

In the multi-screen automatic display control of this embodiment, the display speed is equivalent to that of a conventional multi-screen display television receiver because the presence or absence of broadcasting of each channel is checked when outputting a multi-screen. However, this multi-screen automatic display control function can be prohibited by the setting of the viewer. If it is desired to increase the display speed, the above-described FIG.
The control mode may be executed as described with reference to FIGS.

[0070]

As described above, according to the present invention, before executing the multi-screen display mode, it is necessary to determine whether or not each channel has a broadcast and to control to store a still image of each channel. When the multi-screen display mode is executed, a still image based on each channel can be displayed immediately. At the same time, control is performed so that the number of undisplayed channels is also displayed, so that information necessary for confirming the broadcast content can be obtained for the viewer, which is more convenient. Furthermore, when the power is turned on, still images based on all the channels being broadcast are automatically displayed, so that the viewer can check the broadcast contents based on all the channels without performing any operation. Therefore, it is particularly effective for a viewer who wants to know the broadcast contents of each channel when the power is turned on.

[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 a flowchart showing a control operation for detecting the presence / absence of broadcasting of each channel when multi-screen display is off.

FIG. 3 is a flowchart showing a control operation when a multi-screen display is turned on.

FIG. 4 is a flowchart showing a display channel switching control operation during multi-screen display.

FIG. 5 is a flowchart showing a multi-screen automatic display control operation when the power is turned on.

FIG. 6 is a screen display diagram showing an example of a multi-screen display mode.

[Explanation of symbols]

12: Multi-screen tuner, 13: Video signal processing circuit, 1
4 ... Changeover switch, 15 ... First video memory, 16 ...
2nd video memory, 17 ... output processing circuit, 18 ... picture tube, 19 ... OSD display circuit, 20 ... control unit (microcomputer), 21 ... memory for control data storage, 22 ... remote control, 22a ... power button, 22b ... Multi button.

Claims (4)

[Claims] 1. A multi-screen display tuning means for selecting one of a plurality of channels and receiving a television signal of the selected channel; Video signal processing means for performing predetermined signal processing on the television signal and outputting the video signal; storing and reading out video signals for a plurality of channels necessary for multi-screen display, which are compressed by the video signal processing means. A first storage unit, a second storage unit capable of storing and reading compressed video signals for a plurality of channels from the video signal processing unit and the first storage unit, and the second storage Output processing means for performing processing for displaying the video signal read from the means and outputting the same, and display means for displaying an image based on the video signal from the output processing means on a screen A third storage unit for storing information indicating the presence or absence of a broadcast obtained for each channel selected by the multi-screen display channel selection unit; and a display unit for displaying character information created based on the information. On-screen display means for superimposing and displaying on the display screen of the above, and periodically selecting the multi-screen display tuning means and storing video signals in the first and second storage means,
A control unit for displaying a multi-screen by controlling the readout. The control unit receives a video signal from the video signal processing unit, determines whether or not there is a broadcast for each channel, and uses the determination result as the information. In addition to storing in the storage means, when performing multi-screen display, the number of undisplayed channels obtained by counting the number of broadcast channels that are not displayed on the multi-screen from the read information is displayed on the screen. A multi-screen display television receiver, comprising: control means for controlling on-screen display means. 2. The control means controls the determination of the presence or absence of broadcasting for each channel and the storage of information as a determination result in a third storage means during a period when multi-screen display is not executed. The multi-screen display television receiver according to claim 1, wherein: 3. The multi-screen display according to claim 1, wherein the control unit displays the number of undisplayed channels obtained by counting from the information on a multi-screen display when executing multi-screen display. The multi-screen display television receiver as described in the above. 4. The control means, when power is turned on,
2. The control method according to claim 1, wherein after performing the multi-screen display so as to display the still images based on all the channels being broadcast for a certain period of time irrespective of the user's operation, control is performed so as to end the multi-screen display. 2. The multi-screen display television receiver according to 1.