JP2895944B2 - Multi-screen display device - Google Patents

Description

The present invention relates to a multi-screen display device for displaying a high-definition video signal using N NTSC displays.

(B) Conventional technology Conventionally, as a multi-screen display device for displaying a high-vision video signal having an aspect ratio of 16: 9 by using N NTSC display devices having an aspect ratio of 4: 3, Japanese Patent Publication No. 1-264482. There is one shown in Japanese Patent Publication No. According to this apparatus, a high definition video signal is divided into three in the vertical direction, stored in a memory, passed through a vertical filter, and then divided into four in the horizontal direction.
High-definition images can be projected on a single NTSC monitor.

However, the conventional device has a disadvantage that the memory and the vertical filter must be operated at a high speed of 11 MHz or more, and the circuit operation lacks stability.

(C) Problems to be Solved by the Invention The present invention has been made in view of the above points, and can maintain high-definition of high definition even if the internal processing speed of the memory and the vertical filter is reduced, and can maintain the stability of the circuit. The present invention provides a multi-screen display device in which is improved.

(D) Means for Solving the Problems The present invention relates to a multi-screen display device for displaying a high-vision video signal having an aspect ratio of 16: 9 by using N NTSC display devices having an aspect ratio of 4: 3, A / D conversion means for A / D converting a video signal of the Hi-Vision system; and N number of A / D converters for storing A / D-converted data corresponding to N different portions in one screen of the Hi-Vision system. Storage means; means for controlling writing and reading of the storage means; scanning line conversion means for converting the number of scanning lines output from the storage means; and D / A conversion for D / A conversion of the output of the scanning line conversion means. A multi-screen display device comprising:

(E) Function In the present invention, the internal processing of the storage means and the vertical filter is performed at a low speed by dividing the high-definition A / D-converted video signal into N and supplying the divided signals to the N storage means and the vertical filters.

(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

First, FIG. 2 schematically shows an NTSC TV screen, in which the screen aspect ratio is 4: 3 and the number of scanning lines in one frame is 525. Fig. 3 shows a high-definition TV
The screen is schematically represented, and the screen aspect ratio is 16:
9. The number of scanning lines in one frame is 1125.

Next, FIG. 4 shows a screen configuration in the present embodiment, in which four NTSC display devices are provided in the horizontal direction and three display devices are provided in the vertical direction.
And a total of 12 are arranged to form one screen. Then, the overall aspect ratio is 16: 9, which matches the aspect ratio of the high-vision system. Therefore, with this screen configuration, one HDTV video signal can be converted to 12 NTSC
It can be displayed on the type indicators D1 to D12.

On the other hand, to display one image on the whole screen, 525
× 3 = 1575 scanning lines are required, and the number of scanning lines in the high-vision system is 1125. Therefore, it is necessary to convert the number of scanning lines from five to seven.

Also, the field frequency is 60Hz for the HDTV system,
Since the NTSC method is 59.94 Hz, field frequency conversion is required.

FIG. 1 shows a block diagram of the apparatus of the present embodiment.
Is a high-definition video signal with a 59.4MHz clock.
A / D converters for M / D conversion, M1 to M12 are twelve memories each storing three frames of A / D converted data corresponding to twelve different parts of one screen of the HDTV system. Is a write control unit that controls so as to sequentially write different data to each of the memories at a clock of 59.4 MHz;
7. A read control unit that reads out data from each of the memories at a clock of 16 MHz and inserts two pieces of dummy data into five scanning lines. F1 to F12 change the number of scanning lines of each memory output from five. The scanning line converting means C1 to C12 for converting into seven lines D / A convert the output of the scanning line converting means.
It is a D / A converter.

 Next, the operation of the above-described circuit will be described.

First, the Hi-Vision video signal is supplied to the A / D converter 1 in parallel in the state of R, G, and B primary color signals, converted into digital data, and then divided into twelve and supplied to the memories M1 to M12. Each memory is 59.4MHz from write control unit 2.
Only the data corresponding to the position obtained by dividing the high-definition image into 12 is written by the clock.

When reading, the NTSC signal is expanded on the time axis by reading with a 7.16 MHz clock from the read control unit 3. In addition, at this time, 2 for every memory output of 5 scanning lines.
The dummy data (0 data) is inserted and output.

In addition, writing and reading of this memory
Of the field frequency from to 59.94Hz. That is, the written data is read out about once every 33 seconds while discarding the data for one frame.

Next, the outputs of the memories M1 to M12 are respectively supplied to the scanning line conversion means F.
It is supplied to 1 to F12 and converted from 1125 to 1575.

 FIG. 5 shows a specific example of the scanning line conversion means.

The R, G, and B parallel data is first converted into serial data by the parallel / serial converter 4 and supplied to the vertical filter 5. This vertical filter has six 1H delay lines H1 to H6 and seven coefficient units K1.
K7 and a well-known digital filter composed of an adder ADD, and a detailed description thereof will be omitted. The data interpolated by the vertical filter is converted by the serial / parallel converter 6 into R, G, B parallel data. This vertical filter is also processed at a speed of 7.16 MHz.

Then, the parallel data from the respective scanning line converters F1 to F12 are A / D converted by the D / A converters C1 to C12, respectively, and supplied to the corresponding displays D1 to D12.

As a result, the image is enlarged and displayed on an NTSC display with 12 high-definition images.

In the present embodiment, the number of the indicators is 12, but the number of the indicators is 6, 24.
Or 46 pieces.

(G) Effects of the Invention As described above, according to the present invention, in a multi-screen display device that displays a high-definition video signal using N NTSC display devices, the internal processing speed of the memory and the vertical filter is reduced. Therefore, the stability of the circuit can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a multi-screen display device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of an NTSC system, FIG. 3 is an explanatory diagram of a Hi-Vision system, and FIG. FIG. 5 is an explanatory diagram of a display device in this embodiment, and FIG. 5 is a block diagram of a scanning line conversion unit. 1 A / D converter 2 Write control unit 3 Read control unit M1 to M12 Memory F1 to F12 Scanning line conversion means C1 to C12 D / A converter D1 to D12 display

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinichiro Kitagawa 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Takeshi Tanaka 2--18-18 Keihanhondori, Moriguchi-shi, Osaka (56) References JP-A-2-224483 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04N 7/01 H04N 5/66

Claims (3)

(57) [Claims] 1. A multi-screen display device for displaying a high-vision video signal having an aspect ratio of 16: 9 by using N NTSC display devices having an aspect ratio of 4: 3. A / D conversion means for D-conversion, and N for storing A / D-converted data corresponding to N different parts in one screen of the HDTV system, respectively.
Storage means, means for controlling writing and reading of the storage means, scanning line conversion means for converting the number of scanning lines output from the storage means, and D / A for D / A conversion of the output of the scanning line conversion means. A multi-screen display device comprising: A conversion means. 2. The multi-purpose storage device according to claim 1, wherein said storage means performs frequency conversion from a field frequency of the HDTV system to a field frequency of the NTSC system by performing writing at the timing of the HDSC system and reading at the timing of the NTSC system. Screen display device. 3. A parallel-serial converter for converting each parallel data stream of R, G, and B into a serial data stream, a vertical filter receiving the serial data stream, and an output of the vertical filter. 2. The multi-screen display device according to claim 1, further comprising a serial-parallel converter for converting the data into parallel data of R, G, and B.