JPH1169258A - Multi-channel display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display plural reduced sum pictures around a main picture, so as not to be overlapped with each other. SOLUTION: An A/D converter section 1 converts a video signal for a main picture into a digital signal, a reduction processing section 2 reduces the signal by (n-1)/n in vertical and horizontal directions respectively, and the reduced signal is written in a main picture memory 3, (2n-1) sets of video signals for a sub picture are converted into digital signals at an A/D converter section 4, and the signal is reduced into 1/n in vertical and horizontal directions respectively and the reduced signal is sequentially written in a sub picture memory 3. A control section 9 is used to select and read data in the main picture memory or data in the sub picture memory properly and the selected data are given to a compositing section 7, where (2n-1) sets of sub picture are composited around the main picture, and the result is displayed on a display section 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-channel display device, and more particularly to a multi-channel display device in which a main screen is reduced, a plurality of sub-screens are displayed around the main screen, and used for channel search and the like.

[0002]

2. Description of the Related Art A multi-channel display device for simultaneously displaying a plurality of channels in order to search for a channel other than the channel currently being viewed is divided into a plurality of screens, and a plurality of channels reduced to the same size are arranged vertically and horizontally. Some of them are displayed side by side, others are displaying the channel being viewed to fill the entire screen, and the other channels are reduced in size and fitted. In this case, the former has a problem that the screen of the channel being viewed is reduced and is difficult to see, and the latter has a problem that the entire screen cannot be viewed because another screen interrupts the screen being viewed.

[0003]

SUMMARY OF THE INVENTION In view of the foregoing, the present invention does not disturb the main screen (screen of the viewing channel) on the sub-screen (screen for channel search or the like), and
An object of the present invention is to enable a large number of sub-screens to be displayed simultaneously without any gap.

[0004]

According to the present invention, in order to solve the above-mentioned problems, a first reduction section for reducing the vertical and horizontal directions of a video signal for a main screen to n-1 of n each, A second reducing unit for reducing the vertical and horizontal directions of 2n-1 video signals for each sub-screen to 1 / n each, and a second reducing unit around the main screen from the first reducing unit The present invention provides a multi-channel display device including a combining unit for combining 2n-1 sub-screens and a display unit for displaying a screen from the combining unit.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a multi-channel display device according to the present invention, a video signal for a main screen is reduced in a vertical direction and a horizontal direction by n-1 each of n in a first reduction section, and is stored in a main screen memory. The video signal for each sub-screen is recorded in the second reduction unit in the vertical direction and the horizontal direction by 1 / n each.
2n-1 screens are recorded in the sub-screen memory, and 2n-1 screens read from the sub-screen memory are read by the synthesizing unit on the left or right side and below or above the main screen read from the main screen memory. Are synthesized and displayed on the display unit.
The first reduction unit thins out the video signal for the main screen by one line for every n lines and thins the pixels of each line by one pixel for every n pixels, and the second reduction unit cuts the video signal for each sub-screen by n.
At the same time, n-1 lines are thinned out every line, and n-1 pixels are thinned out at every n pixels.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a multi-channel display device according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram of a main part of an embodiment of a multi-channel display device according to the present invention. In the figure, 1 is an A / D converter,
The main screen video signal is converted into a digital signal. Reference numeral 2 denotes a first reduction processing unit that performs reduction processing on the signal from the A / D conversion unit 1 in the vertical direction and the horizontal direction to n−1 of n each. Reference numeral 3 denotes a main screen memory for recording a signal from the first reduction processing unit 2. Reference numeral 4 denotes an A / D converter, which converts a video signal for a sub-screen into a digital signal. 5 is a second reduction processing unit,
The vertical and horizontal directions of the signal from the A / D converter 4 are each reduced to 1 / n. Reference numeral 6 denotes a sub-screen memory for recording signals from the second reduction processing unit 5 for 2n-1 screens. Reference numeral 7 denotes a synthesizing unit that appropriately switches data from the main screen memory 3 and data from the sub-screen memory 6, and synthesizes 2n-1 sub-screens around the main screen. 8 is a display unit,
The screen synthesized by the synthesizing unit 7 is displayed. 9 is a control unit,
The control of the reduction processing units 2 and 5, the writing / reading control of the main screen memory 3 and the sub screen memory 6, the control of the synthesizing unit 7, and the like are performed.

Next, the operation of the multi-channel display device according to the present invention will be described with reference to an example in which a first to seventh sub-screens are displayed on the right and lower sides of the main screen as shown in FIG. explain. The video signal for the main screen is converted into a digital signal by the A / D converter 1 and is input to the first reduction processing unit 2 to reduce the vertical and horizontal directions of the screen to three quarters each. The video signal from the D conversion unit 1 is thinned out for every four lines, and the pixels of each line are thinned out for every four pixels, and the processed data is written to the main screen memory 3. In the pixel thinning, the sampling clock of the A / D conversion unit 1 is set so that the sampling number is three quarters of the number of pixels of one line of the display unit 8, and the number of pixels of one line is reduced to four quarters. You may make it reduce to three.

Each of the video signals for the first to seventh sub-screens is sequentially input to an A / D converter 4 and converted into a digital signal, respectively, and then input to a second reduction processing unit 5 for vertical and horizontal conversion. In order to reduce the direction to one quarter, the video signal is thinned out for every four lines for each sub-screen, and the pixels of each line are thinned out for every three pixels. The screen is written one by one with the address being determined. In the pixel thinning, the sampling clock of the A / D conversion unit 4 is set so that the sampling number is one quarter of the number of pixels in one line of the display unit 8,
The number of pixels in one line may be reduced to one fourth.

The data of the main screen written in the main screen memory 3 and the data of the seven sub-screens written in the sub-screen memory 6 are read out through the control unit 9 and input to the synthesizing unit 7, respectively. Is synthesized on one screen as shown in FIG. That is, following the reading of the first line data from the main screen memory 3, the address of the first sub-screen (sub 1) is designated from the sub-screen memory 6 and the first
The data of the line is read out, then the data of the second line of the main screen memory 3 and the data of the second line of the first sub-screen are continuously read from the sub-screen memory 6, and so on.
After the data reading of the first sub-screen is completed, the data of the second sub-screen (sub 2) is read from the first line following the reading of the line data of the main screen. Thereafter, reading is continued in the same manner, and after reading of the data of the last line of the main screen and the third sub-screen (sub 3) is completed, the seventh sub-screen (sub 7), the sixth sub-screen (sub 6), the fifth sub-screen (Sub 5) Then, the addresses of the fourth sub-screen (sub 4) are specified, and the data of the first to last lines are sequentially read out, thereby completing one screen (frame) shown in FIG. In the above description, an example in which the number of sub-screens is seven has been described. For example, the main screen may be reduced to two-thirds, and five sub-screens reduced to one-third may be displayed around the sub-screen. .

[0010]

As described above, according to the multi-channel display device of the present invention, a plurality of reduced sub-screens are displayed around the main screen. Since it is displayed without being displayed, it is effective when used for a channel search or the like.

[Brief description of the drawings]

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

FIG. 2 is an example of a multi-channel display.

[Explanation of symbols]

 1, 4 A / D conversion unit 2 First reduction processing unit 3 Main screen memory 5 Second reduction processing unit 6 Sub-screen memory 7 Compositing unit 8 Display unit 9 Control unit

Claims (5)

[Claims] A first reduction unit configured to reduce a vertical direction and a horizontal direction of a video signal for a main screen to n-1 of n each; and a vertical direction of 2n-1 video signals for each sub-screen. And a synthesizing unit for synthesizing 2n-1 sub-screens from the second reducing unit around the main screen from the first reducing unit and a second reducing unit for reducing the horizontal direction by 1 / n. And a display unit for displaying a screen from the synthesizing unit. 2. A main screen memory for recording data from the first reduction unit, and a 2n-byte data from the second reduction unit.
2. The multi-channel display device according to claim 1, further comprising a sub-screen memory for recording one screen, wherein the combining unit combines the data read from the main screen memory and the data read from the sub-screen memory. 3. The 2n sequentially input by the second reduction unit.
3. The multi-channel display device according to claim 2, wherein the video signal for one sub-screen is reduced and recorded in the sub-screen memory. 4. The first reducing section thins out a video signal for a main screen by one line for every n lines and thins pixels of each line by one pixel for every n pixels. 4. The multi-channel display device according to claim 1, wherein n-1 lines of video signals are thinned out for every n lines and pixels of each line are thinned out for n-1 pixels. 5. The first reduction section reduces the vertical and horizontal directions of the video signal for the main screen to three quarters, respectively, and the second reduction section reduces the vertical and horizontal directions of the video signal for each sub-screen. 4. The method according to claim 1, wherein the direction and the horizontal direction are each reduced to one-fourth, and seven sub-screens are arranged along the right or left side and the upper or lower side of the main screen. The multi-channel display device according to claim 3 or 4.