JP3398412B2 - Multi display system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-display system capable of displaying an enlarged image or a plurality of images using a plurality of monitor devices.

[0002]

2. Description of the Related Art For example, nine, twelve, or sixteen monitor devices are piled up to form a multi-screen monitor, and a video signal is divided and enlarged for each monitor device to be supplied to a large-scale monitor. 2. Description of the Related Art A multi-display system capable of displaying screen images and multiple types of images is known.

[0003]

By the way, an image displayed in such a multi-display system is, for example, N.
Video signals of the TSC system are common, but of course E
Displaying as a multi-image using a DTV or HDTV video signal or a graphic signal from a personal computer, a workstation or the like is also considered.
However, in the conventional multi-display system, signals of these various systems are converted into standard video signals (NTSC signals) and supplied to the monitor device.
There was a problem that the original image quality-improved signal cannot obtain the image quality improvement effect on the multi-screen.

[0004]

In view of the above problems, the present invention makes it possible to obtain a high image quality effect in accordance with an input video signal of various types as a multi-display system, and to provide a plurality of types. The purpose is to be able to handle the video signal input of at the same time.

Therefore, as a multi-display system, a timing generating means for generating a processing timing signal based on a synchronizing signal extracted from an input video signal and a video signal input based on the processing timing signal A plurality of video processor units each including an image processing unit capable of performing image division and / or image enlargement to generate an n-system video signal are provided to support a plurality of types of video signal inputs. , A multi-screen processor having switch means for selecting and outputting a video signal from each of the n-system video processor units. In addition, the image output can be executed corresponding to a plurality of types of scanning frequencies, and n system video signals selected by the switch means in the multi-screen processor are respectively supplied.
And a multi-scan image display device . With this, it is possible to obtain a multi-display screen at each scanning frequency with respect to various types of input video signals.

At this time, all or some of the units of the video processor unit provided in a plurality of units in the multi-screen processor are attachable to and detachable from the main body of the multi-screen processor, and are dedicated according to the type of input video signal. It is configured so that it can be replaced with the unit of the video processor section.

Here, the unit of the video processor unit which is detachable from the main body of the multi-screen processor and is exchanged according to the type of the input video signal is a unit of the video processor unit corresponding to the video signal from the personal computer. A unit or a unit of a video processor unit corresponding to a video signal from a workstation.

[0008]

In the video processor unit corresponding to the input video signal, image processing and display scanning are performed according to the scanning frequency of the video signal, and the standard signal (NTS) is used.
By not needing to down convert to C),
It is possible to obtain a high quality image according to the input image signal. Also, a personal computer, a workstation, or the like having a different video signal format depending on the model can be dealt with by replacing the units of the dedicated video processor sections.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The embodiment of FIG. 1 is a block diagram of a multi-display system, in which 1 is a multi-screen processor and 2 is n (for example, 1
6 shows an image display unit configured by stacking six image display devices (2A to 2P).

The multi-screen processor 1 is provided with a plurality of video processor units 1A to 1D for performing image processing on an input video signal. 1A
Is a processor unit for NTSC video signals, 1B is a processor unit for high-definition video signals, 1C is a processor unit for video signals supplied from a personal computer, and 1D is a processor unit for video signals supplied from a workstation. . Since the circuit blocks inside each of the video processor units 1A to 1D have the same configuration, the processor unit 1A for NTSC video signals is used.
Only the internal circuit block is shown in the figure, and the illustration and description of the video processor sections 1B to 1D are omitted.

For this multi-screen processor 1,
An NTSC video signal, a high-definition video signal, a personal computer output video signal, and a workstation output video signal are supplied and input to the corresponding video processor units 1A to 1D, respectively.

Then, each of the video processor units 1A to 1D
The video signals input to the
16 video signals in the output switch section 3
Is selected,Image display section 2InEach image display device
(2A to 2P), enlarged video, multiple videos, composite
Images are displayed.

Each of the image display devices (2A to 2P) is a so-called multi-scan monitor. For example, the horizontal scanning frequency of the video signal is 15 to 36 KHz, and the vertical scanning frequency is 50 to 100 Hz. To be able to.

In the video processor section 1A (the following description also applies to the video processor sections 1B to 1D), the video signal input from the terminal 11 is amplified by the video amplifier 12 and then supplied to the A / D converter 13. Digital data. Further, it is also supplied to the sync separation circuit 14 to extract the horizontal sync signal and the vertical sync signal. And
The PLL circuit 15 is locked using the extracted synchronization signal, a processing reference clock is generated, and is supplied to the timing generation circuit 16.

The video signal converted into digital data by the A / D converter 13 is divided by the division processing section 17 according to the number of enlargement planes (for example, divided into 16), and the respective divided signals are supplied to the enlargement processing section 18. To be done. In the enlargement processing unit 18, 1 / n (for example, 1/1
Interpolation processing is performed on the pixels of 6), and the number of pixels of each divided video signal is made the same as the number of pixels of the original video signal before division. Then, each signal divided into 16 systems and pixel-interpolated is converted into an analog signal via the D / A converter 19 and supplied to each monitor device of the monitor unit 2.

Here, the sampling clocks of the A / D converter 13 and the D / A converter 19, and the processing timing clocks of the division processing section 17 and the enlargement processing section 18 are supplied from the timing signal generation circuit 16. The timing generation circuit generates various timing signals based on the synchronizing signal of the input video signal. That is, these image processings are executed in accordance with the original scanning frequency of the input video signal, and the video processor unit 1A to which the NTSC video signal is input monitors the output after the image processing at the scanning frequency of the NTSC system. It is obtained as a signal to be supplied to the unit 2. Similarly, the video processor unit 1B
In, since the input video signal is an HDTV system video signal, an output after image processing at the HDTV system scanning frequency can be obtained. Also for the video processor units 1C and 1D, image processing output at the scanning frequency of the input video signal can be obtained.

Here, each of the video processor units 1A to 1D
The video signals after image processing for each of the 16 systems output from
It is input to the output switch unit 3. The output switch unit 3 selects and outputs 16-system video signals to be supplied to the image display unit 2 in accordance with operation information of a user operation unit (not shown) or an operation program of the system controller. For example, 16 systems of NTS supplied from the video processor unit 1A
Switching is performed by selecting and outputting the C video signal or selecting 16 HDTV video signals supplied from the video processor unit 1B. Alternatively, each video processor unit 1A
It is also possible to select each of four systems from 1D to 1D, select a video signal from a predetermined number of systems from two or three video processors, and select the video signals from each of the video processors 1A to 1D to output simultaneously. .

The video signals of 16 systems (or 15 systems or less) selected by the output switch section 3 are respectively displayed on the image display section.
It is supplied to 16 image display devices (2A to 2P) in No. 2 and displayed and output. As a result, various multi-images are realized. For example, a certain image is enlarged 16 times and displayed, a 4 times enlarged image is displayed in four units, and images from a plurality of image sources are simultaneously enlarged / divided and displayed. The image mode can be realized.

Here, since the video signals supplied to the image display unit 2 are not all down-converted to standard signals such as NTSC, the high image quality effect originally provided in the input signal is directly realized. To be done. For example, a high-resolution video display of the HDTV system and a flickerless video with a non-interlaced signal of the EDTV system or the like can be realized as a multi-display. In addition, each of the video processor units 1A to 1D corresponds only to an input video signal of a specific system, and down conversion or the like is unnecessary, so that the circuit configuration becomes very simple.

Furthermore, when switching between an enlarged screen and a normal screen (a state in which video signals that are not subjected to division / enlargement processing are supplied to the respective monitor devices to display, for example, 16 identical screens), etc. Since the frequencies of the input video signal and the output video signal viewed from the screen processor 1 are the same (since they are not converted), there is also an advantage that switching noise does not occur.

The timing change for division processing control and interpolation processing control when changing the division / enlargement mode (for example, in the case of an NTSC signal, enlargement is 1 time, 4 times, 9 times,
16 times, 25 times ... 256 times aspect ratio 3:
The expansion mode can be changed to match the 4 ratio, and HDTV
With respect to the signal, it is possible to change the enlargement mode that matches the aspect ratio of 16: 9), or division processing when the number n of monitor devices of the monitor unit 2 connected to the multi-screen processor 1 is changed. Timing changes for control and interpolation control are performed by the CPU 20 in each of the video processor units 1A to 1D by issuing control data and basic timing change commands.

Further, the CPU 20 communicates with an external device so that the external device can be controlled and the multi-screen processor unit 1 can be controlled by the external controller.

Here, as schematically shown in FIG. 1, the video processor units 1C and 1D are attachable to and detachable from the main body of the multi-screen processor 1 at so-called expansion slot portions.

Especially for a graphic video signal from a personal computer or a workstation, since the scanning frequency and the number of pixels may differ depending on the model, the video processor unit is a unit corresponding to each video source device. As a multi-screen processor 1
Separately from. By replacing the multi-screen processor 1 with the multi-screen processor 1, the multi-screen display process can be performed for a large number of PCs and workstations. Of course, the units of the video processor unit that can be replaced are not limited to these, and various types such as EDTV, high-definition video signal, PAL signal, SECAM signal, etc. can be prepared and used in the expansion slot unit to replace various images. It will correspond to the source. In addition, in the multi-screen processor 1, all the video processor units may be interchangeable.

[0025]

As described above, the multi-display system of the present invention enlarges / divides in the monitor based on the scanning frequency of the input video signal without down-converting it to a specific video signal system. Since it is possible to execute multi-screen display by the video signal
It is possible to achieve high image quality as a multi-screen, simplification of the circuit configuration of the video processor unit, prevention of switching noise, and the like.

Further, various display modes can be realized by simultaneously inputting a plurality of types of different video signals, processing each as a multi-video and supplying the multi-video to the multi-scan monitor device. In addition, the video processor can be attached to and detached from the multi-screen processor as an expansion slot so that it can be used by exchanging it according to the video source so that it can support video signals of a very large number of types. There is an effect that.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Multi-screen processor 1A-1D Video processor part 2 Image display part 2A-2P image display device 3 Output switch part 13 A / D converter 14 Sync separation circuit 15 PLL circuit 16 Timing generation circuit 17 Division processing part 18 Enlargement processing part 19 D / A converter 20 CPU

Front page continuation (72) Inventor Takashi Ikeda 5-14-15 Oue, Ayase City, Kanagawa Incorporated Meiko Co., Ltd. (56) Reference JP-A-3-106280 (JP, A) JP-A-6-169430 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04N 5/68 H04N 5/265 G09G 5/00

Claims (4)

(57) [Claims] 1. A timing generation means for generating a processing timing signal based on a synchronization signal extracted from an input video signal, and an image division and / or an image for the video signal input based on the processing timing signal. A plurality of video processor units each including an image processing unit capable of expanding and generating an n-system video signal;
In addition to being compatible with multiple types of video signal input,
A multi-screen processor having a switch means for selecting and outputting a video signal from each of the n-system video processor sections, and image output can be executed corresponding to a plurality of types of scanning frequencies. together, n pieces of Mar video signal of n lines is selected by said switch means in said multi-screen processor are supplied
A multi-display system comprising a chi-scan image display device, and configured to obtain a multi-display screen at each scanning frequency for input video signals of various systems. 2. The whole or a part of each unit of a video processor unit provided in a plurality of units in the multi-screen processor is attachable to and detachable from the main body of the multi-screen processor, and is dedicated according to a type of an input video signal. The multi-display system according to claim 1, wherein the multi-display system is configured so that it can be replaced with a unit of the video processor section of. 3. A unit of a video processor unit that is detachable from the multi-screen processor main body and that is exchanged according to the type of an input video signal is a video processor unit corresponding to a video signal from a personal computer. The multi-display system according to claim 2, wherein the multi-display system is a unit. 4. A unit of a video processor unit that is detachable from the main body of the multi-screen processor and that is exchanged according to the type of a video signal to be input is a video processor unit corresponding to a video signal from a workstation. The multi-display system according to claim 2, wherein the multi-display system is a unit.