JPH02304592A - Multipicture display device - Google Patents

Abstract

PURPOSE:To not only simultaneously obtain plural expanded pictures but also reduce the number of memories and to make the system constitution simple and inexpensive by inputting plural image sources to one image expanding device. CONSTITUTION:Inputted image sources A, B, and C are subjected to A/D conver sion by A/D converters AD1, AD2, and AD3 and are inputted to data selectors S1, S2, etc., through three data busses, and data selectors corresponding to display devices P1 to P8 select data of the image source B, and those correspond ing to display devices P9, P10, P13, and P14 select data of the image source A, and those corresponding to display devices P11, P12, P15, and P16 select data of the image source C, and they are written in frame memories M1, M2, etc., controlled by a write control circuit 5. The read address is controlled by a read control circuit 6 in accordance with the expansion rate and the display position, and data is subjected to D/A conversion and is supplied to correspond ing display devices P1, P2, etc., to obtain an expanded picture. Thus, a high picture quality and large pictures are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is designed to display a predetermined still image or moving image using a large number of display devices, and in particular, to display a high-quality and large-screen display using properly arranged display devices. The present invention relates to a multi-screen display device that can be

(b) Prior Art Conventionally, projection devices have been used to obtain images on a large screen, but these devices have the drawbacks of being large, increasing costs, and having a dark screen.

Further, there is a method disclosed in Japanese Patent Publication No. 50-32009 as a method of displaying images on a large number of display devices. According to this method, one video source can be enlarged and displayed on a large screen on a plurality of display devices by using an enlargement device. Here, the enlarging device is provided with a number of frame memories corresponding to the number of displays, for example, and obtains an image with an arbitrary enlargement ratio by controlling the reading of data written in the frame memories.

FIG. 2 shows a configuration for obtaining a plurality of enlarged screens on 16 screens using a plurality of video sources in a two-speed multi-screen display device.

In the same figure, (1), (2), and (3) are video enlarging devices that input video sources (A, B, and C) and create video signals of arbitrary magnification ratios, respectively. /
'Equipped with a D converter, 16 frame memories, a memory control device, and a D/A converter. (4) is a video switching device which inputs video signals from each of the video enlarging devices, and uses an external switching signal to determine which portions of a plurality of displays to be described later are supplied with video signals from which video enlarging devices. Switch. (Pl) to (Pl6) are 16 displays, specifically CRTs.

According to the above-mentioned apparatus, as shown in FIG.
The character ko can be displayed at any position on the screen at any magnification.

(C) Problems to be Solved by the Invention However, in the conventional device shown in FIG. 2, one video enlarging device only has the function of enlarging one video source. number)
This has the disadvantage that it requires a memory equal to the number of display devices and a complicated video switch device, making the system very expensive.

The present invention overcomes the above-mentioned drawbacks.

(D) Means for Solving the Problems The present invention provides A/D conversion of input video signals.
a conversion means, a plurality of memory means in which the outputs of the A/D conversion means are respectively stored, a control means for controlling loading and reading of the memory means, and a plurality of memory means for D/A converting the outputs of the memory means, respectively. A multi-screen display device comprising a video enlarging device including a plurality of D/A converting means, and a plurality of display means respectively connected to the D7/A converting means, wherein the video enlarging device includes a plurality of D/A converting means. It has a plurality of A/D conversion means for A/D converting an input video signal and a plurality of data selection means for selecting which of the outputs of the plurality of A/'D conversion means is to be stored in the memory means. This is a multi-screen display device characterized by the following.

(E) Function The present invention can simultaneously obtain a plurality of enlarged images by inputting a plurality of video sources to one image enlarging device.

(f) Example An example of the present invention will be described below with reference to one drawing. This embodiment is a multi-screen display device capable of simultaneously enlarging three types of video sources onto 16 display devices, and a block diagram thereof is shown in FIG.

In the figure, (A D +) (A D *) (A D s) is an A/D converter that converts three types of video sources into A/'D, respectively, and (S,) (S , )... are Each of the above A,,'
1 where the D converter output is input through three sets of data buses.
There are six data selectors, and each data selector selects and outputs one of three sets of data buses in response to a selector control signal. (M,) (Ml)... are 16 frame memories into which the output from this data selector is written, (5) (5)... is a write control circuit that controls writing to this frame memory, ( 6) (6)... is a readout control circuit that also controls readout, (D A , )(
DA1)... are 16 D/A converters that respectively D/A convert each video data read out from each frame memory.
' It is an A converter. These constitute an image enlarging device (7).

(P,) (Pl)... is a display consisting of 16 CRTs to which video signals are input from each of the D and /A converters.

Next, the operation of the device of this embodiment will be explained.

First, as shown in FIG. 3, the video images E A ] [B ] [C] of each video source (A ]2×4
, [C] is expanded to 2×2).

Each input video source (A) (B/C) is A/D
The data is A/D converted by a converter (A D , ) (A D , ) (A D s), and inputted to each data selector (S 1 ) (S ri . . . ) through three sets of data buses.

Then, among the data selectors, display i(P,)-(P
, ), select the video source (B) data and display B (P 5) (P +.) (P +5) (P
For those corresponding to 11), select the data of the video source (A), and further select the display (P , , ) (P , , ) (P ,
1) Select the video source (C) data corresponding to (P,,). This selected data is stored in a frame memory (M) controlled by a write control circuit (5).
, )(M,)...

The read address of each frame memory is controlled by a different read control signal from the read control circuit (6) depending on the enlargement ratio and display position. Furthermore, each read data is sent to a D//A converter (DA,) (
D A , )... are subjected to D/A conversion, and the images are supplied to the corresponding display devices (P , ) (P t>...), thereby obtaining an enlarged image as shown in FIG. 3.

(g) Effects of the Invention As described above, according to the present invention, a single enlarging device can simultaneously enlarge a plurality of video sources, so the number of memories is small, and the system configuration is simple and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a multi-screen display device according to an embodiment of the present invention, FIG. 2 is a block diagram of a conventional multi-screen display device, and FIG. 3 is a schematic diagram of an enlarged image. (1)(2)(3)(7)...Video enlargement device, (AD
,)(AD,)(AD,)...A/D converter,
(S,) (S,) ~ (S16)...data selector,
(Ml) (M,) ~ (Mlg)...frame memory,
(DA,)(DA,)~(DA,,)...D/A converter, (P,)(P*)~(p, a>...display device.

Claims (1)

[Claims] (1) A/D conversion means for A/D converting an input video signal, a plurality of memory means in which outputs of the A/D conversion means are respectively stored, and a control means for controlling writing and reading of the memory means. and a plurality of D/A converting means for D/A converting the outputs of the memory means, respectively; and a plurality of display means respectively connected to the D/A converting means. In the multi-screen display device, the video enlarging device includes a plurality of A/D conversion means for A/D converting a plurality of input video signals, and which one of the outputs of the plurality of A/D conversion means is stored in the memory means. 1. A multi-screen display device comprising a plurality of data selection means for selecting data.