JPS5898778A - Monitor device selection display system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display method for selecting monitor devices in a chain connection of a plurality of monitor devices in a display device according to the present invention.

As a conventional 0iIiS processing system, it is known that a display control device can connect a plurality of CRT monitors in a chain on the same 2-in to display a similar screen display. However, it was not possible to display different types of screens, and if this were to be realized, the video interface of the display control device would have to have a separate output means.

Furthermore, performing the different types of image processing using conventional methods as described above has the disadvantage that the bar V-query becomes expensive from both the logical and implementation standpoints.

It is an object of the present invention to provide a monitor/device selection/display method that does not cause the above-mentioned drawbacks. On the other hand, depending on the amplitude of the video signal level, each monitor device selects only the video signal that it receives and displays it on the screen. This allows for split display, etc.

The present invention will be explained in detail by way of examples below.

FIG. 1 shows the main body (1) of the device to which an embodiment of the present invention is applied.
) The connected image processing system is shown in a four-dimensional diagram. In this image processing system, a group of monitor devices, such as a CRT monitor (3m) to a cm monitor N (3r+), are chain-connected to the display control device (2). The keyboard (4) is for input operations such as raters, etc., and the monitor/default 9 chair selection display (
Activation of refresh memory corresponding to each CRT monitor)
This is one way to do this. Another method is to specify from the main body (1).Next, the functional operation of the display control device (2) will be explained.

The microprocessor transfers data to and from the main body (1), performs manual input from the keyboard, and controls the entire control device (2) using a microprogram (firmware) system. The CRT controller (2) is under the control of the microprocessor aD and has multiple memory memories (18a-n) for storing screen information of each 01%'r monitor.
Sending Memoria F reply now (MA) to screen display/Nozo turn generator that generates Zo turn Sending Rusk address (R person) to residence, video control C21
), the keyboard controller a receives and processes data, which is keyboard input information, under the control of the microprogram system described above.

Furthermore, the oscillation circuit 0 and dot counter CI4 supply the basic tally clock to the CRT controller (to) K, and the multiplexer αQ1 path driver aη controls the address and data to the fresh memory dll (18m to 18a). , P/8 (parallel to serial) converter 4 converts the parallel data output from the turn generator (1'l) into serial data. ) is the video signal (210) output from the video controller Qυ
The level of the synchronization signal (211) is changed by the refresh memory selection signal (150) of the CRT controller QS color. In other words, it is a part that generates and sends a highly variable video signal (to) and a variable synchronization signal (2) with level changes to a group of monitor devices (3) chain-connected on the same line on the video interface, and these signals are transmitted to each CRT. Monitor Yu O Video Resino Z (3
m') (see Figure 2).

Figure 2 shows the display control device (2) circular video driver (to) in Figure 1 and the CR'r of the monitor device group.
CR'r monitor 1 (3
Example (but not limited to) of a circuit that performs an interface function such as level varying means and level determining means for each of the video receivers S (3m') in m)
It is a functional block diagram showing. In the figure, the video driver @ has nine video signals (210) as described above,
A synchronization signal (211) and a refresh memory selection signal (150), for example, a nine flag signal indicating the screen size corresponding to each CRT monitor with the high order bits, are input. Here, a digital video signal (210
) is input to the video amplification circuit (220), the amplitude of the signal is once amplified, and then each level thick (220) of the next R is input to the video amplifier circuit (220).
1m-m) K Anajig surface high level deo signal (22
9). In each level shifter, the amplitude of the high level video signal (229) is classified in stages, and at the same time, the permission/inhibition by 0N10FPK of the gate terminal of each level thick is determined by the select signal (230) given from the level shift specifying circuit (225). Output control is performed to select a video signal of a particular amplitude level. The correspondence between the refresh memory select signal (150) input to the level thick designation circuit (225) and the video signal (210) input to the video amplifier circuit (220) is shown in FIG. This can be determined by the contents of the refresh memory designation address, response, display timing, etc. Then, the variable video signal (
) is sent to each CRT monitor connected in the chain and is also supplied to the peak detector circuit (227), where the variable level character clock (1-shot) is sent to the peak detector circuit (227), where the timing width is set (one-shot) for one character or one pixel on the screen. 2
31') is created. This clock is a level mixing circuit (
228) A variable synchronization signal (to) which is level-modulated on the K input synchronization signal (, 211) is similarly sent to each monitor connected in a chain. On the other hand, the video receiver (3m') inside the CB'r monitor (3m) includes the variable video signal (to) sent from the video driver (2) of the display control device (2) in the variable synchronization signal (to). A signal corresponding to the previous level character clock (231)K is used to determine the nozzle and select only the designated video signal. To explain further, each rail selector (30
1a=n) When the K variable video signal (to) is input,
Nine variable level clocks (309
) is supplied to the selector specifying circuit (305) (V7 trellistor configuration), and each selector (3G1a=a
) to select a particular rail selector by providing a strobe signal (311) to K. That is, it becomes possible to select only the desired variable video signal, and the video correction conversion circuit (306) further demodulates the normal digital video signal output (310) I'c. In addition, when demodulating, the video dot click (31
Since the duty correction is performed by the timing generation in 2), a highly accurate video signal (310) can be obtained.

The video correction amplifier circuit (308) corrects the level attenuation due to high frequency rounding of the variable video signal and outputs it to the next chain-connected CRT monitor. Since the variable synchronization signal does not have a high frequency timing, there is little level attenuation, so there is no need for correction amplification.

FIG. 3 shows the timing and level changes of the variable synchronization signal @ and the variable video signal (2) sent from the video driver (to) in the #Iz diagram. The variable video signal (to) in the figure is expressed at the timing of each rask in order to correspond to the dot raster position of the display turn (character or figure display) in FIG. As a result of the above, the selection display of each monitor device shown in Fig. 4 is realized. - Figs. 5 to 7 show other examples to which the method of the present invention is applied. This is a data processing system consisting of N devices (510a to 510fi) connected in a chain on the same line of a general data processing apparatus (SOO). Here, the data processing device (50
Variable level data (501) similar to the above example from the 0) side
[See Figure 6], the device selection signal (502
) is started and output. Figure 6 shows the timing and level state of this signal. The method of outputting to the interface or inputting from the interface is the same as in the previous example. FIG. 7 shows the received data format of each device corresponding to FIG. 6. still,
In FIGS. 6-7, the timings are shifted to make it easier to see, but it is of course possible to send variable level data at the same timing.

The present invention has the following features: (1) Displaying different types of screen contents on multiple monitors by connecting them on the same line (one video signal line) is realized on each monitor; Also, when connected to one monitor, split display on the same screen is also possible. By using the video signal level as a color discrimination function in a color display device, the VMU/CD effect when connecting remotely, that is, the color video signal line is conventionally required for each R, G, and B color using a coaxial cable. In addition to being advantageous in that only one wire is required compared to the conventional method, and the driver/receiver circuit can be saved, it is also easier to use remote control than in the past, and stable signal reception is possible. -) In addition to the above-mentioned image processing systems, for data processing systems, device designation and data transfer can be done simultaneously depending on the level, which speeds up data transfer. This book has many benefits, including the ability to process multiple data simultaneously.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of an ijs processing system to which the present invention is applied, FIG. 2 is a block circuit diagram for explaining the interface function in the present invention, and FIG.
4 is a diagram showing display examples of each monitor, FIG. 5 is a block diagram showing another example of a processing system to which the present invention is applied, and FIG. 5
FIG. 7 is a format diagram showing the output state of FIG. 5. '2:
Display control device 22: Video drive 2/S31~
3o: Monitor device

Claims (1)

[Claims] In an image processing system in which a plurality of monitor devices are chain-connected to a display control device, means for transmitting screen display information to each monitor device at a Kll/O signal level for each monitor device, and transmitting at different levels. (9) means for uniquely selecting and displaying each video signal on each monitor device side, so that a different type of display is performed on each of the plurality of monitor devices by means of one system of video interface devices; A monitor device selection and display method that is characterized by the following features: