JPH02186885A - Multichannel display device - Google Patents

Abstract

PURPOSE:To eliminate the flicker of a picture by separately providing picture storing means under writing and reading and obtaining still pictures wholly for the pictures of an N channel to be projected on a picture tube. CONSTITUTION:A first picture storing means 13, second picture storing means 14 and address control means 15, which selects and controls the input/output of data to the picture storing means 13 and 14, are provided. The picture storing means is provided for the two pictures and the picture storing means under the reading is made independent of the picture storing means under the writing. Then, when the pictures for the N channel are finished being written, the pictures to be projected on a picture tube 5 are wholly stored before 1 cycle and displayed like the set of the still pictures by exchanging the picture storing means of reading and writing modes in the next cycle. Thus, the flicker of the picture is eliminated and the pictures for the N channel can be stably displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a multi-channel display device that processes signals so that broadcasts of a plurality of channels can be viewed simultaneously on the screen of one television receiver.

Background of the Invention In recent years, advances in digital technology have enabled television receivers to do more and more interesting things that were previously impossible. One of these is the ability to view images from multiple channels simultaneously on a single television receiver.

Hereinafter, a conventional multi-channel display device will be described with reference to the drawings. FIG. 2 is a block diagram of a conventional 9-channel display device. In Fig. 2 F, 1 is a tuner, 2 is an intermediate frequency amplification circuit, and 3 is a video detection circuit.
6 is a video output circuit, 6 is a picture tube, 6 is a channel control means, 7 is a synchronization separation circuit, 8 is a sampling write control means, 9 is a readout control means, 1o is a horizontal/vertical deflection circuit, 1
1 is a synchronizing signal generation circuit, and 12 is a video storage means.

This circuit converts the screen of a television receiver to 9 as shown in Figure 3.
This allows you to view broadcast images from nine channels at the same time by dividing the screen. However, since there is only one tuner, eight of the nine channels are still images for a certain period of time.

Next, the operation of the multi-channel display device shown in FIG. 2 will be explained. The video information of the channel specified by the channel control means 6 is transmitted to the tuner 1. Intermediate frequency amplification circuit 2. The signal passes through the video detection circuit 3 and becomes a color television signal, which is sampled by the column sampling write control means so that the horizontal direction is viewed and the vertical direction is viewed. Thereafter, the video is subjected to M/D conversion and written into the video storage means 12. The sampling timing at this time is created based on the output synchronization signal of the synchronization separation circuit 7. The memory area of the video storage means 12 is divided as shown in FIG.
The 9th channel is divided by channel, such as area engineering.
Images of each channel are stored in separate areas. These controls are performed in conjunction with the A sampling write control means 8 and the channel control means 6. The channel control means 6 changes the selected channel of the tuner 1 at regular intervals, and in conjunction with this, the sampling write control means 8 sequentially changes the write address of the video storage means 12 as shown in FIG. To go. When the area is written, change the channel back to the first channel and repeat the steps below.

Apart from these operations, the readout control means 9 reads out video information from the video storage means 12 based on the synchronization signal generated by the synchronization signal generation circuit 11 and sends it to the video output circuit 4 via the readout control means 9. Video information for nine channels stored in the picture tube 6 by the video storage means 121 is projected. The readout timing at this time is one picture tube 6.
In order to read out information for addresses in the horizontal direction of the video storage means 12 for one horizontal scan, information on channels 1 to 3 is simultaneously read out, or information on channels 4 to 6 is simultaneously read out.
Alternatively, information on 7 to 9 channels will be read out simultaneously. In this way, nine channels of video information can be viewed simultaneously on one screen.

Problems to be Solved by the Invention However, with the above configuration, if the speed of channel switching is increased in order to bring all nine screens closer to the moving image, the screens become difficult to see. This is because the image storage means during reading and the image storage means during writing are the same, so one of the nine divided screens is always being rewritten, that is, moving once. One moving (changing) image among the nine screens moves to the right or down at regular intervals, so if the fixed period (rewriting time) is made faster, one screen will flicker and become difficult to see. It will become.

In view of the above-mentioned problems, the present invention provides a multi-channel display device that is capable of displaying all of the multiple split screens like a moving image without flickering even when changing channels quickly.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has video storage means for two screens (first and second storage means), and has one video storage means for reading and one for writing. make the means independent,
After writing for N channels, in the next cycle, the image storage means in read mode and write mode are switched, so that all of the images on one picture tube and N screen are those that were stored one cycle ago, and are a collection of still images. Display as follows.

Effect The above configuration eliminates the screen flickering seen in conventional systems, where one screen out of the N screens displayed on one picture tube is constantly being rewritten, and the image for N channels becomes a stable image. It can be displayed in

Embodiment Hereinafter, a multi-channel display device F according to an embodiment of the present invention will be described.
This will be explained with reference to a drawing.

FIG. 1 is a block diagram of a multi-channel display device in one embodiment of the present invention. A 9-channel display device is shown here. Reference numerals 1 to 11 in FIG. 1 are the same as those shown with the same reference numerals in FIG. 2, and detailed explanation thereof will be omitted. , 13 and 14 in FIG. 1 can be isometrically considered to be two video storage means 12 in FIG. It is. Reference numeral 16 denotes address control means for selectively controlling input and output of data to and from the video storage means 13 and 14.

The operation will be explained below using FIG.

The address control means 16 distributes the addresses specified by the write control means 8 and the read control means 9 to the video storage means 13 and the video storage means 14 so that the reading and writing video storage means 13 and 14 are not the same. conduct. The switching timing is as follows.

It is now assumed that the write control means 8 is writing the image information of the first channel to the address person in FIG. 4 of the video storage means 13. At this time, the readout control means 9 is controlled by the address control means 16 so as to read out the stored contents of the video storage means 14.

The receiving channel changes in order from 1 to 2 to 3 at regular intervals determined by the channel control means 6, and accordingly, the writing control means 8 changes the reception channel to the video storage means 1.
The address written in 3 also changes from A to 8 to C in FIG. 4. When the writing control of the writing control means 8 finishes writing the information of the 9th channel to the address of the 4th drawing in the Lee video storage means 13, the address control means 16 issues a standby command to the channel control means 6. , the channel transmission is temporarily interrupted and a vertical synchronization signal from the synchronization signal generation circuit 11 is waited for. When the vertical synchronization signal is detected, the address control means 16 starts the write control means 8.
The video storage means 14 which was the read side first read out the address of
After allocating the address of the readout control means 9 to the video storage means 13 side, the standby command issued to the channel control means 6 is released. As a result, the channel control means 6 selects the first channel and the write control means 8 selects the first channel.
The video information of the first channel is sampled and written to the address t in FIG. 4A in the video storage means 14. On the other hand, the readout control means 9 reads out the video information in the video storage means 13 written just before and projects it onto the picture tube 6. Next, the write and read operation modes are switched when the write control means 8 finishes writing the address in FIG.

As described above, according to this embodiment, the image of channel -9 is read from the storage means that was stored one vertical period ago, so the image information is stable, and the information on the screen is Good multi-channel display can be achieved without screen flickering due to sequential projection of images.

Effects of the Invention As described above, according to the present invention, since the image storage means for writing and reading are always separate, all N-channel screens projected on the picture tube are still images. Therefore, at the moment the scene changes, all N screens are at the same time - this eliminates the unnaturalness of the screen where parts of the screen (moving parts) move, which was a problem in the past, and causes flickering. It is possible to create an easy-to-read screen without any clutter.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a multi-channel display device according to an embodiment of the present invention, Fig. 2 is a block diagram of a conventional multi-channel display device, and Fig. 3 explains an image display method of the multi-channel display device. Plan view of a useless picture tube
FIG. 4 is a plan view for explaining storage addresses within the storage means. 6... Channel control means-8... Kusunoki sampling write control means-9... Readout control means, 11... TV synchronization signal generator-1
3, 14... Image storage means, 16...
Address control means. Name of agent: Patent attorney Shigetaka Awano and one other person

Claims (1)

[Claims] A channel selection means for sequentially selecting N-channel television broadcasts within one vertical period, and a channel selection means that samples video information of one channel of the selected N-channel television broadcasts to reduce the amount of video information to 1/N. a write control means for converting into video information; first and second storage means for sequentially storing N channels of video information from the write control means;
, readout control means for sequentially reading out the stored information in the second storage means and outputting it to be displayed on the picture tube, and in the n-th vertical period, N data from the write control means to the first storage means are provided. Write the video information of the channel, and
The N-channel video information written in the (n-1)th vertical period is read in the storage means, and the N-channel video information written in the first storage means in the n-th vertical period is read out in the (n+1)th vertical period. A multi-channel display device comprising: address control means for controlling the address so as to read video information and write N-channel video information from the write control means into the second storage means.