JPH01303880A - Large sized display system for high definition television receiver - Google Patents

Abstract

PURPOSE:To obtain a large sized screen by displaying a video signal of the high definition television system having number of scanning lines being twice that of the existing television system of over and a wide aspect ratio onto plural video monitors of the existing system. CONSTITUTION:A high vision video signal 1 is digitized at an AD converter 2 by using a sampling frequency. A synchronizing separator 3 separates a horizontal synchronizing signal H from the high vision video signal and supplies the signal to a clock oscillator 4 and generates a clamp pulse 5, which is supplied to the AD converter 2. Then a clock oscillator 4 supplies the clock to each section and a scanning line converter 6 applies the arithmetic operation to generate a data by 4 scanning lines from a data by 3 scanning lines and an address generator 7 receives the clock and various pulses to generate an address to a memory section 8. The memory section 8 reads out the data from 12 positions in the memory and 12 sets of DA converters 9 convert the digital data read from the memory into an analog video signal 10 and the resulting signal is fed to 12 sets of monitors 11. Thus, a large sized screen is obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to a large display system for video signals of the so-called high-definition television system, which has more than twice as many scanning lines and a wide aspect ratio as the current television system. Regarding
In particular, the present invention relates to a high-definition television large display system that uses a plurality of current video monitors or video projectors to achieve a large screen.

[Conventional technology]

The so-called high-definition television system, which has more than twice as many scanning lines and a wide aspect ratio as the current television system, has a resolution comparable to that of 35mm film, and is used in all fields of industry, including television broadcasting, electronic publishing, and film production. It is expected that it will be applied to Hi-Vision, which has 1,125 scanning lines, 60 fields/second, and an aspect ratio of 16:9, is one of these systems and is the most advanced system toward practical use.

(The following explanation will be made using high-definition television as an example, but the present invention can be easily applied to other high-definition television systems.) Currently, displays for high-definition video signals include CRT (cathode ray tube) and There are video projectors, but the maximum size of CRT at present is 40 inches, and although video projectors can be quite large, they are superior to CRTs in terms of image quality and stability, such as resolution and dynamic range. inferior and very expensive.

On the other hand, multi-video systems are used in building entrance halls, entertainment areas, and expositions.

This uses a plurality of CRT type monitors, such as nine or twelve, to display one NTSC video signal. FIG. 2 is an example in which one video signal is displayed on nine monitors.

The first method of obtaining nine video signals from one video signal is to enlarge each of the nine parts of the video signal using an enlarger 1 as shown in FIG. 3, thereby obtaining nine video signals. The second method is to create on the VTR tape in advance nine video signals that are correlated with each other to form one video at the video software production stage.
It is used in the system shown in the figure. Here, nine VTRs loaded with nine video tapes are linked in a well-timed manner to produce a complete, large-scale image.

[Problem to be solved by the invention]

As mentioned above, large video projectors that display high-definition video signals are expensive, and it is difficult to say that the full potential of high-definition is being demonstrated in terms of image quality and stability.The maximum CRT size is 40 inches. It's the size.

Of the two methods for obtaining video signals for a multi-video system, the former can obtain an enlarged signal from any video signal and is highly flexible in terms of video display. Since the component signals of the system are expanded, the image quality is not satisfactory. In addition, with the latter method, it is possible to obtain better image quality than using a magnifying device by using methods such as using 35-inch film at the production stage, but the video software that can be displayed on the system is already compatible with the multi-video system. There are major restrictions on the video software that can be displayed.

An object of the present invention is to provide an inexpensive, high-definition, large-screen multi-video system by displaying high-definition video signals using a plurality of 25&/60 monitors. If prepared, it will be easy to display on a large screen.

[Means to solve the problem]

In the present invention, by displaying a so-called high-definition television system video signal, which has more than twice as many scanning lines and a wide aspect ratio as the current television system, on a plurality of current system video monitors, a large-sized You can get the screen.

〔Example〕

As an embodiment of the present invention, a high-definition video signal, which is a type of high-definition television, is transmitted in a total of 1 column in 3 columns vertically and 4 columns horizontally.
An example will be described in the case of displaying on two 525760 70-inch video projectors of the current system.

FIG. 5 is a diagram showing the front size of a 70-inch video projector, and shows that the length is 1100 mm and the width is 1430 mm. The inner middle part is where the image is displayed, and is 1070mm in height and 14ρO in width.
It shows that it is mm. FIG. 6 is a front view of twelve 70-inch video projectors arranged in three rows and four rows.

The effective number of scanning lines in the current television system is 483, but if each projector is adjusted so that the image of 483 in the vertical direction becomes the size of 1100 mm in the vertical direction of one video projector, 3 in the vertical direction It is possible to display 483×3=1449 video signals with one projector. The effective scanning line of the no-vision video signal is 1035.
Since it is a book, if it is displayed without particularly converting the number of scanning lines, 1449-1035=414 lines will not be used effectively, and no images will be displayed at the top and bottom of the screen. Therefore, if new video data is created at a rate of three to four lines using a scanning line converter, data for 1035 x 4/3 = 1380 lines will be obtained. Although there is still a shortage of 1449-1380 = 69 lines, a relatively simple scanning line converter that creates 4 scanning line data from 3 scanning line data is good, so we will use this example here. Continue to explain.

As shown in Figure 6, the height when three video projectors are stacked vertically is 11l100mmX3=3
300, the height of 1380 high-definition videos is 3300 mm x 1380 ÷ 1449; 3143. The aspect ratio of high-definition video is 16 horizontally and 9 vertically, so in this case the horizontal size of the screen is 3143.
mmX16÷! It becomes 11 嬌 5588 mm. On the other hand, the number of pixels per line of high-definition is 2200 (
The effective number of pixels (1920) is determined, but this is a standard for video production, and the frequency band of the luminance signal is 30.
MHz can be achieved. However, if the video source is a professional VTR or a display system with a MUSE decoder, a frequency band of 20 MHz is considered sufficient, and the sampling frequency is 45 to 55 MHz.
Hz is appropriate. Therefore, when configuring a counter, if the number of pixels per line is 1536 (1024 + 512, which allows a binary counter to be configured with a simple configuration), the sampling frequency is 33.75 KHz.
(High-definition line frequency) x 1536 = 51.8
4MHz, the number of effective pixels is 1536X1920÷2
It becomes 200#1341. Since these 1341 pixels are displayed within the aforementioned 5588 mm range, the effective number of pixels per video projector is 1341 x 14
60÷5588#350 pixels. The horizontal blanking ratio is approximately 15%, and the number of pixels per line is 412.
(#35010.85) and select the clock frequency of 6.48MHz, which is 1/8 of the aforementioned 51.84MHz.
Line frequency is 6.48MHz ÷ 412 = 15.72
8KHz, which is 15.73 of the current television system.
The frequency is very close to 4KHz.

In this way, by appropriately selecting the sampling frequency of the high-definition signal and the clock frequency of the output side that is output as the video signal of the current television system, interpolation calculation of data in the horizontal direction becomes unnecessary. Note that in FIG. 6, the shaded area indicates the area where the image appears.

FIG. 1 is a signal system diagram of one embodiment of the present invention.

In the figure, the high-definition video signal 1 is a 2:1 interlaced signal with 1125 scanning lines, a field station wave number of 60 Hz, and is digitized by the AD converter 2 at a sampling frequency of 51.84 MHz. The sync separator 3 extracts the horizontal sync signal H from the no-evision video signal.
is separated and supplied to the clock oscillator 4. Furthermore, a clamp pulse 5 is generated and supplied to the AD converter 2. The clock oscillator 4 generates a clock of 51.84 MHz, which is the horizontal synchronization signal H multiplied by 1536, and 6.48 MHz, which is 1/8 of the horizontal synchronizing signal H.
Generates Hz and supplies it to each part. The scanning line converter 6 has a memory for at least two lines, a multiplier, etc., and receives locks and various pulses for four scanning lines from the data for three scanning lines, and transfers the data to the memory part 8. Generates addresses for writing and reading. The memory portion 8 has a capacity to store at least 1380.times.1341 words of data in the above example, and reading is performed simultaneously from 12 locations in the memory. There are 12 DA converters 9,
Each converts the digital data read from the memory into an analog video signal. The data given to DA converter #1 is, for example, data corresponding to the video of the upper leftmost part when a high-definition video signal is divided into 12 as shown in FIG. 6, and the data given to DA converter #2 is data corresponding to the second video from the left in the upper row.

Although Figure 1 only shows one video signal system,
In the case of color signals, exactly the same system is used for red,
It is sufficient to provide three systems, blue and green. By supplying the 525/60 video signal IO obtained in this way to the 12 monitors 11, the high-definition video signal can be displayed on a large screen consisting of 12 monitors.

The above example describes the case where scanning line conversion is performed at a ratio of 3 to 4 lines, but this method has the advantage that the scanning line converter is relatively simple, but as shown in FIG. 12
The drawback was that there were areas on the top, bottom, left and right sides of the large screen made up of a single video projector where no image could be seen. The other embodiments described below have the drawback that the scanning line converter is somewhat more complex, but it is possible to display high-definition video signals on the entire screen.

Now, if we perform scanning line conversion at a rate of 5 to 7 lines, we get 103 lines.
5 x 715 = 1449 scanning lines are obtained, which is the effective scanning line of 3 projectors 483 x 3 = 144
The number matches 9, and it is exactly 3300m in the vertical direction.
It is possible to display high-definition video signals at the same time. In this case, the horizontal size of the screen is 3 as shown in Figure 7.
300mm x 16/9 = 5867mm, which slightly exceeds the horizontal size of the projector, 5480mm. If the high-vision sampling frequency is the same as in the previous example, the number of effective pixels is 1341, and the number of effective pixels per projector is 1341×146015867#334. Clock frequency 6.48MHz and line frequency 6
．． 48+412=15.728KHz may be the same as the previous example. A system diagram of this embodiment is shown in FIG. In this figure, in contrast to the example of FIG. 1, a scanning line converter 6 is provided downstream of the memory part 8. In the previous example, since the scanning line converter 6 was provided before and after the memory part 8, the storage capacity of the memory part 8 was 1449 lines, and the scanning line converter 6 required high-speed signal processing of 51.84 MHz. In contrast, in the example of FIG. 8, signal processing 6. of the memory unit 6 is required. It has the advantage of being able to perform well at MHz. However, 12 scan line converters must be provided. Which system to use should be decided based on the cost of the entire system.

[Effects of the Invention] As explained above, the present invention has a plurality of video monitors or video projectors of the current television system arranged vertically and horizontally, and divides a high-definition signal into these to display a plurality of current television system video monitors or video projectors. The aim is to obtain a large high-definition screen by providing a signal from a converter that outputs a high-definition video signal. In other words, without using a very expensive large high-definition display,
A relatively inexpensive, bright, large screen can be achieved. Although there are joints because it is a stack of 72 monitors or video projectors, it can also be used in conjunction with multi-video systems used in exhibition halls and entertainment areas, opening the door to use as a large display for a variety of visual expressions. . In other words, it is possible to record a high-definition signal (an example of the present invention), or to record an NTSC signal.
It is possible to enlarge the signal and display it (multi-video system), or even display the same video signal on all displays.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a front view of a display of a 9-screen multi-video system, FIG. 3 is a system diagram of a conventional 9-screen multi-video system, and FIG. A signal system diagram of a multi-video system when a signal source is created for multi-video, FIG. 5 is a front view of a 70-inch projector, and FIG. 6 is a diagram of the present invention consisting of 12 70-inch video projectors. FIG. 7 is a front view of a large screen according to the present invention when an image is projected on the entire screen, and FIG. 8 is a system diagram showing another embodiment of the present invention corresponding to FIG. 7. shows. Agent Patent Attorney Shinmo UchiharaFigure 2Figure 3Figure 4Figure 3Figure 6Figure 7

Claims (1)

[Claims] A large-scale high-definition television display system that displays high-definition television video signals using multiple conventional video monitors or video projectors.