JPH11239307A - Multi-screen display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a display device not to display a slave screen whose signal is not received in display of a multi-screen consisting of a main screen and plural slave screens. SOLUTION: The display device is provided with a main screen processing means (tuner 1-signal processing section 6) that processes a main screen to display an image in a required display size, a slave screen processing means (turner 7-signal processing section 13) that processes plural input video signals relating to slave screen to display them in respective required display sizes, a composite section 14 that conducts composite processing for the main screen and plural slave screens in a multi-screen display with a required arrangement, a control section 13 that controls the main screen processing means, the slave screen processing means and the synthesis section 14, and a signal detection section 15 that detects plural input video signals relating to the slave screens respectively. The control section 13 controls the main screen processing means, the slave screen processing means and the composite section 14 so that video image is displayed on a slave screen whose signal cannot be detected by the signal detection section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a multi-screen display device, and more particularly to control of a sub-screen display in a multi-screen display including a main screen and a plurality of sub-screens.

[0002]

2. Description of the Related Art FIG. 3 is a main block diagram showing an example of a conventional multi-screen display device. Hereinafter, a conventional multi-screen display will be described with reference to FIG. Note that, as an example, the multi-screen displays a main screen and nine sub-screens (child to child) as shown in FIG. In FIG. 3, each block from the tuner 21 to the signal processing unit 26 is for the main screen, and each block from the tuner 27 to the signal processing unit 32 is for the small screen. The video signal related to the main screen is selected by the tuner 21, and the demodulation unit 22 demodulates the video signal. A / D converter for the demodulated analog video signal
After conversion to digital video data at 23, main screen reduction unit 24
Performs a process of reducing video data to make the main screen a required display size. The reduced image data is stored (written) in the main screen memory unit 25. Writing and reading of the main screen memory unit 25 are performed under the control of the control unit 33. The main screen video data read from the main screen memory unit 25 is sent to the synthesizing unit 34 after the signal processing unit 26 performs signal processing for obtaining an appropriate image quality.

The basic functions of the tuner unit 27 to the signal processing unit 32 for processing the other small screen are the same as those of the above-mentioned main screen processing, but a plurality of video data to be processed (the number of small screens). Differs in that In FIG. 2A, video data for nine screens of child to child is processed. Also, the reduction ratio of each child screen in the child screen reduction unit 30 is larger than that of the main screen reduction unit 24. Signal processing unit 26 on main screen
The main screen image data and the nine screens of small screen image data from the small screen side signal processing unit 32 are input to the synthesizing unit 34, where each image is displayed in the arrangement of FIG. And outputs composite video data Do.

[0004]

However, in the conventional multi-screen display device (FIG. 3), even if there is no signal among a plurality of sub-screens due to the end of broadcasting or the like, the image is displayed. Originally, the multi-screen display is used to select the next desired program to be viewed next to the currently viewed main screen from a plurality of sub-screens. Therefore, even if a child screen in a noise screen state is displayed without a signal, no use is made, and it is rather annoying. The conventional multi-screen display has such a drawback. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described drawbacks, and has as its object to provide a multi-screen display device that does not project a child screen when there is no signal or the like in the child screen. .

[0005]

According to the present invention, there is provided a main screen processing means for processing one input video signal relating to a main screen so as to be displayed on a screen in a required display size, and a plurality of sub-screens relating to a sub-screen. A small-screen processing means for processing each of the input video signals so as to be displayed on the screen at a required display size, a main-screen video data from the main-screen processing means, and a small-screen video from the small-screen processing means A synthesizing unit for synthesizing each of the main screen and a plurality of child screens in a required arrangement based on the data, and controlling the main screen processing unit, the child screen processing unit, and the synthesizing unit; A control unit and a signal detection unit that receives each of the plurality of input video signals related to the child screen, detects each of the input video signals, and sends a detection signal to the control unit; The present invention provides a multi-screen display device in which the control unit controls the main screen processing unit, the small screen processing unit, and the synthesizing unit so as not to display an image on a small screen for which no signal is detected at the output unit. is there.

When a predetermined number of sub-screens are not detected by the signal detecting section, the undetected sub-screens are not displayed, and the display size of each of the other sub-screens for displaying an image is increased. The control unit controls the child screen processing unit and the synthesizing unit so that each of the child screens is displayed in a required arrangement.

Alternatively, when a predetermined number of child screens are not detected by the signal detection unit, the control unit is configured not to display the undetected child screens and to increase the display size of the main screen. The main screen processing unit, the sub-screen processing unit, and the combining unit may be controlled.

Alternatively, when a predetermined number of sub-screens are not detected by the signal detecting section, the detected sub-screens are not displayed, and the display size of each of the other sub-screens for displaying an image and the main screen are displayed. The control unit may control the main screen processing unit, the small screen processing unit, and the synthesizing unit so as to increase the display size and display each of the small screens in a required arrangement.

Further, the signal detection in the signal detection section detects a synchronization signal component of the input video signal.

Alternatively, the signal detection in the signal detection section may be performed when the level of a synchronization signal component of the input video signal is equal to or higher than a reference level.

Alternatively, the signal detection in the signal detection section may detect a video signal component of the input video signal.

The main screen processing means may include an A / D converter for converting an input video signal relating to the main screen from an analog signal to digital video data, and a video data from the A / D converter. A main screen reduction unit that reduces the number of pixels in the horizontal and vertical directions to a required number, and a main screen memory unit that stores reduced video data from the main screen reduction unit.
And a signal processing unit for performing processing to obtain an appropriate image quality based on the video data read from the main screen memory unit.

[0013] The small screen processing means may include an A / D conversion unit for converting each of the plurality of input video signals related to the small screen from an analog signal to digital video data, and an image from the A / D conversion unit. A small-screen reduction unit for reducing the number of pixels in the horizontal and vertical directions of each small screen to a required number based on data; a small-screen memory unit for storing reduced video data from the small-screen reduction unit; It comprises a signal processing unit for processing each of the sub-screens to have an appropriate image quality based on the video data read from the screen memory unit.

[0014]

Embodiments of the present invention will be described below with reference to the drawings based on embodiments. FIG. 1 is a main block diagram showing an embodiment of a multi-screen display device according to the present invention. FIG. 2 is an explanatory diagram of a multi-screen display.
Note that, as an example, the multi-screen displays a main screen and nine sub-screens (child to child) as shown in FIG. First, the basic operation of FIG. 1 will be described. In FIG. 1, each block from the tuner 1 to the signal processing unit 6 is for the main screen, and the tuner 7 to the signal processing unit 12
Each block is for a small screen. The video signal related to the main screen is selected by the tuner 1, and the demodulation unit 2 demodulates the video signal. A / D the demodulated analog video signal
After the conversion into digital video data by the conversion unit 3, the main screen reduction unit 4 performs reduction processing of the video data to make the main screen a required display size. As this reduction processing, for example, the number of horizontal lines is reduced to the required number of lines, and the number of pixels of the horizontal lines is reduced to the required number of pixels.

The reduced video data is stored (written) in the main screen memory unit 5. This main screen memory unit 5
Writing and reading are performed under the control of the control unit 13. The main screen video data read from the main screen memory unit 5 is sent to the synthesizing unit 14 after the signal processing unit 6 performs signal processing for obtaining an appropriate image quality. Tuner unit 7 for processing the other child screen
Since the basic functions of the signal processing unit 12 are the same as those of the main screen processing described above, the processing is performed because the tuner unit 7 switches the channel selection at regular intervals in accordance with the designation of the small screen display (multiple channels). The difference is that there are a plurality of pieces of video data (the number of child screens). The analog video signal demodulated by the demodulation unit 8 is also sent to the signal detection unit 15, where signal detection is performed for each of the plurality of small-screen video signals.

The video signals of the small picture are sequentially sent from the demodulation unit 8 to the signal detection unit 15 in a predetermined order. Therefore, the signal detection unit 15 can detect a video signal for each small screen. The result of signal detection for each sub-screen is
Sent to 13. Here, as a method of the signal detection,
There are a method of detecting a synchronization signal component of a video signal and a method of detecting a video component, and either method may be used. Further, in the method of detecting the synchronization signal component, a method of setting a certain reference level and detecting the signal when the synchronization signal level is equal to or higher than the reference level may be adopted. In this method, it is possible to cope with unstable synchronization due to a weak electric field or the like. The digital image data that has passed through the demodulation unit 8 and the A / D conversion unit 9 is subjected to image data reduction processing by a small screen reduction unit 10. This reduction processing is performed irrespective of the signal detection by the signal detection unit 15. Therefore, if the child screen display is designated as shown in FIG. 2A, the video data for nine screens from child to child is processed. The method of this reduction processing may be the same as the processing on the main screen. The reduction ratio of each child screen in the child screen reduction unit 10 is larger than that of the main screen reduction unit 24 because there are a plurality of child screens.

The reduced video data from the small screen reduction unit 10 is stored (written) in the small screen memory 11 under the control of the control unit 13, and the control unit 13 The writing of the video data of the child screen for which no signal is detected is not performed. For example, when the child screen display is designated as shown in FIG. 2A and four of these child screens (children) are not detected by the signal detection unit 15, the control unit 13 The writing of the video data of the child screen is not performed, and the five child screens (children) whose signals are detected are written in the child screen memory 11. The video data of the five sub-screens (children) read from the sub-screen memory 11 under the control of the control unit 13 are transmitted to the synthesizing unit 14 after the signal processing unit 12 performs signal processing for obtaining an appropriate image quality. Can be

The main screen video data from the signal processing unit 6 on the main screen side and the video data on the five small screens (children) from the signal processing unit 12 on the small screen side are input to the synthesizing unit 14. 2 to perform composite processing so that each video is displayed in the arrangement shown in FIG. 2B, and outputs composite video data Do. As described above, a multi-screen display is not performed for a child screen in which no signal or a synchronization signal is equal to or lower than the reference level. However, FIG.
The display size of each of the sub-screens in (B) is the same as that in the case of projecting as shown in FIG. On the other hand, by further developing the above, a multi-screen is not displayed for a sub-screen where no signal or synchronization signal is equal to or less than the reference level, and a sub-screen or a main screen to be projected by using a margin of the screen, or The display size of both the main screen and the child screen can be increased (enlarged).

For example, when increasing (enlarging) the display size of only the child screen, the control unit 13 finally displays the 5
Change the reduction ratio of the data reduction process (small screen reduction unit 10) for one child screen (child) (control signal S2),
Reduction processing is performed to increase the display size. The extent to which the reduction ratio is changed is determined from the display area of all the sub-screens and the number of display sub-screens, so that the setting data of the reduction ratio may be provided to the control unit 13 in advance. When increasing the display size of only the main screen, the control unit 13 changes the reduction ratio of the data reduction process (main screen reduction unit 4) for the main screen (control signal S1) and reduces the display size to increase the display size. Let it be processed. As to the extent to which the reduction ratio is to be changed, the setting data of the reduction ratio is given to the control unit 13 in the same manner as described above.

When increasing the display size of both the main screen and the child screen, the control unit 13 performs a data reduction process (main screen reduction unit 4) for the main screen and a child screen (child).
, The reduction ratio of both of the data reduction processing (small screen reduction unit 10) is changed (control signals S1 and S2), and the reduction processing is performed so as to increase the respective display sizes. As to the extent to which the reduction ratio is to be changed, the setting data of the reduction ratio is given to the control unit 13 in the same manner as described above. Further, when the display size of the main screen or the small screen is increased as described above, it is necessary to change the display position of each small screen. Therefore, the control unit 13 is provided with control data related to the procedure of the combining process corresponding to the number of child screens to be displayed, and the combining unit 14 performs a required combining process according to a control signal (control signal S3) related to the control data. Do it. As described above, for example, as shown in FIG. 2C, both the main screen and the five child screens (children) can be displayed as enlarged as compared to FIG. 2A.

[0021]

As described above, according to the present invention, in a multi-screen display composed of a main screen and a plurality of sub-screens, there is no signal or a synchronization signal level lower than the reference level in the plurality of sub-screens. When an electric field signal is included, it is possible to detect these signals and not display them. In this case, the displayed sub-screen or main screen,
Alternatively, the display size of both the main screen and the child screen can be increased. On the other hand, conventionally, even a child screen such as the above-mentioned no-signal is displayed in a no-signal state (noise screen) or in an unstable state of synchronization. Originally, the multi-screen display is used to select the next desired program to be viewed next to the currently viewed main screen from a plurality of sub-screens. Therefore, even if a child screen or the like in a noise screen state is displayed without a signal, no use is made, and it is rather annoying. The conventional multi-screen display has such a drawback, but the present invention solves this drawback. From the above, it can be said that the present invention can contribute to the performance improvement of the multi-screen display device.

[Brief description of the drawings]

FIG. 1 is a main block diagram showing an embodiment of a multi-screen display device according to the present invention.

FIG. 2 is an explanatory diagram of a multi-screen display.

FIG. 3 is a main block diagram showing an example of a conventional multi-screen display device.

[Explanation of symbols]

 1, 7, 21, 27 Tuner section 2, 8, 22, 28 Demodulation section 3, 9, 23, 29 A / D conversion section 4, 24 Main screen reduction section 5, 25 Main screen memory section 6, 12, 26, 32 Signal processing unit 10, 30 Small screen reduction unit 11, 31 Small screen memory unit 13, 33 Control unit 14, 34 Synthesis processing unit

Claims (9)

[Claims] 1. A main screen processing means for processing one input video signal relating to a main screen so as to be displayed on a screen at a required display size; A main screen based on the small screen processing means for performing processing to display the images at a required display size, the main screen image data from the main screen processing means, and the small screen image data from the small screen processing means. And a synthesizing unit that performs synthesizing processing so as to display each of the plurality of child screens in a multi-screen in a required arrangement;
A plurality of input video signals related to the child screen are input, each of the input video signals is detected, and a signal detection unit that sends a detection signal to the control unit is provided, and no signal is detected by the signal detection unit. A multi-screen display device, wherein the control unit controls the main screen processing unit, the small screen processing unit, and the synthesizing unit so as not to display an image on the small screen. 2. When a predetermined number of small screens are not detected by the signal detection unit, the undetected small screens are not displayed, and the display size of each of the other small screens for displaying images is increased. 2. The multi-screen display device according to claim 1, wherein the control unit controls the sub-screen processing unit and the synthesizing unit to display each of the sub-screens in a required arrangement. 3. When the predetermined number of child screens are not detected by the signal detection unit, the control unit controls the display unit so as not to display the undetected child screens and to increase the display size of the main screen. 2. The multi-screen display device according to claim 1, wherein the main screen processing unit, the sub-screen processing unit, and the combining unit are controlled. 4. When a predetermined number of small screens are not detected by the signal detection unit, the undetected small screens are not displayed, and the display size of each of the small screens to be displayed and the main screen are displayed. The control unit controls the main screen processing unit, the small screen processing unit, and the combining unit to increase a display size and display each of the sub-screens in a required arrangement. 1
The multi-screen display device according to claim 1. 5. The multi-screen display device according to claim 1, wherein the signal detection in the signal detection section detects a synchronization signal component of the input video signal. 6. The multi-screen display according to claim 1, wherein signal detection in said signal detection section is detected when a level of a synchronization signal component of said input video signal is equal to or higher than a reference level. apparatus. 7. The multi-screen display device according to claim 1, wherein the signal detection in the signal detection section detects a video signal component of the input video signal. 8. An A / D converter for converting an input video signal relating to the main screen from an analog signal to digital video data, and a video data from the A / D converter. A main screen reduction unit for reducing the number of pixels in the horizontal and vertical directions to a required number, a main screen memory unit for storing reduced video data from the main screen reduction unit, and a readout from the main screen memory unit. 2. The multi-screen display device according to claim 1, further comprising a signal processing unit for performing processing to obtain an appropriate image quality based on the video data. 9. An A / D converter for converting each of a plurality of input video signals relating to the sub-screen from an analog signal to digital video data;
A small-screen reduction section for reducing the number of pixels in each of the horizontal and vertical directions to a required number based on the video data from the / D conversion section, and a child storing the reduced video data from the small-screen reduction section. 2. The image processing apparatus according to claim 1, further comprising: a screen memory unit; and a signal processing unit that processes each of the sub-screens to have an appropriate image quality based on the video data read from the sub-screen memory unit. The multi-screen display device according to claim 1.