JP2723954B2 - Display control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display control device capable of displaying different image information on a plurality of display devices.

[Conventional technology]

In recent years, many devices for handling image data such as electronic files have been developed, and an image display system device shown in FIG. 4 for displaying image information obtained from such devices has been proposed.

FIG. 4 is a system block diagram for explaining the basic structure of a conventional image display system. Reference numeral 51 denotes an electronic file body which manages a large amount of images, documents, and the like stored in a storage medium such as an optical disk. 52 is video RAM (VRAM)
Then, the image data read from the electronic file main body 51 is stored. Reference numeral 53 denotes a display configured by, for example, a CRT,
An image, a document, and the like are displayed based on the image signal developed in 2.

On the other hand, as the display 53, a liquid crystal display different from a CRT display has been attracting attention. In particular, displays having a memory function such as an active matrix type and a ferroelectric type have been developed as the screen size increases.

In addition, as an application of the electronic file device, it is being adopted for processing such as seal stamp collation, and there is an increasing tendency to connect a large number of display terminals and to digitize collation work.

[Problems to be solved by the invention]

However, the system for displaying images via the VRAM 52 as described above is configured, for example, as shown in FIG.

FIG. 5 is a system block diagram for explaining the configuration of a conventional image display system, and the same components as those in FIG. 4 are denoted by the same reference numerals.

In the figure, reference numerals 61-1 to 61-N denote terminal devices each comprising an interface IF, a VRAM 52, a keyboard KB, a display 53, and the like.

For this reason, it is necessary to separately provide the VRAM 52 in each of the terminal devices 61-1 to 61-N, and there is a problem that the system becomes very expensive.

In addition, even if the display device has a memory function of the active matrix type, the ferroelectric type, or the like, the memory function is insufficient, so that there is a problem that the VRAM 52 is required and the system becomes expensive. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem. One of the image transfer requests of a plurality of display devices is received, and the received image transfer request is stored in the display device of the image transfer request source. By supplying the image information for one screen, it is possible to reduce the number of storage devices required in the related art, to reduce the size of the entire device, and to provide an inexpensive display control device. I do.

[Means for solving the problem]

The present invention is a display control device capable of displaying different image information on each of a plurality of display devices, a storage unit for storing image information, a storage unit having a storage capacity for at least one display screen, Transfer request receiving means for receiving a transfer request for image information from a plurality of display devices, developing means for expanding image information to be displayed on one display device which has requested transfer from the storage means to the storage means, and the storage means Supply means for supplying the image stored in the storage device to one of the display devices which has requested the transfer;
Control means for controlling the expansion means in order to perform processing for a transfer request from another display device after processing of one transfer request is completed, and using one storage means to display images of a plurality of display devices. It is configured to perform display.

Further, the display device is a display device using a ferroelectric liquid crystal.

Further, each of the plurality of display devices has a timer unit, and issues an image transfer request based on the timing of the timer unit.

[Action]

In the present invention, a transfer request for image information from a plurality of display devices is received, and a supply unit supplies the transfer request to one of the plurality of display devices requesting transfer of the image information stored in the storage unit. After the supply of the image information, the control means controls the expansion processing of the image information to the storage means by the expansion means in order to perform the processing in response to the transfer request from another display device, and the plurality of display devices are controlled by one storage means. Even if the image information to be displayed is supplied to each display device, it is possible to display the image information without deteriorating the image.

Further, since the display device uses a ferroelectric liquid crystal, it is possible to update the display content at a timing using the memory characteristics of the display device itself.

Further, at predetermined time intervals, the image information is developed in the storage means and the image information is supplied to the display device. Therefore, it is necessary to update the image information before the image information displayed on the display device disappears. Make it possible.

〔Example〕

FIG. 1 is a block diagram for explaining a configuration of an image display system to which a display control device according to an embodiment of the present invention can be applied, and the same components as those in FIG. 5 are denoted by the same reference numerals.

In FIG. 1, reference numeral 1 denotes an electronic file main body (electronic file) having a storage device such as a large-capacity storage medium, for example, an optical disk.

Reference numeral 3 denotes a distributor constituting the supply means of the present invention, which is connected to each of the terminal devices 4-1 to 4-N via a communication cable, extracts image data developed in the video RAM 2 as an image signal, and accesses the terminal. The data is transferred to any of the requested terminal devices 4-1 to 4-N.

Each of the terminal devices 4-1 to 4-N includes an interface 5 (having an automatic refresh function), a timer 6,
7, a keyboard 8 and the like. In particular, the display 7 is formed of a ferroelectric liquid crystal display panel, and is configured to be able to hold display information for a predetermined time. Starts the refresh timing counting process, and when the refresh timing is reached, the interface 5 is interrupted and the search data for instructing the transfer of the same image as the display information currently displayed on the display 7 is distributed to the distributor 5. 3 to the electronic file body 1. In response to this, the image data retrieved again by the electronic file main body 1 and expanded in the video RAM 2 is extracted as an image signal, and the distributor 3 requests the interface of any of the terminal devices 4-1 to 4-N requested to access. 5, the display information displayed on the display 7 is refreshed, and the same plane display is continued. The interface 5 has a microprocessor, a ROM, a RAM, and the like, and outputs image information and a search command to the distributor 3 based on a control program stored in the ROM.

 Next, the operation of each unit will be described.

When the search data is input from an arbitrary terminal device, for example, the keyboard 8 of the terminal device 4-1, the search data is notified to the electronic file main body 1 via the interface 5, the communication cable, the distributor 3, and the like. At this time, in this embodiment, the search data is stored in the RAM of the interface 5.
Stored above.

In response, the electronic file body 1 searches the storage medium for image data corresponding to the search data,
Deploy on M2. Next, the image data expanded in the video RAM 2 is extracted as an image signal, and transmitted to the interface 5 of the terminal device 4-1 to which access has been requested by the distributor 3. The interface 5 causes the display 7 to display the received image signal. Since the display 7 can store the display contents for the predetermined time as described above, the interface 5 notifies the distributor 3 of the completion of the reception when the reception of the image signal ends. Thereby, the electronic file body 1
Shifts to a process corresponding to an access request from another terminal.

On the other hand, when the display on the display 7 is started, the refresh timing counting process by the timer 6 is started,
When the refresh timing comes, the interface 5 is interrupted, the refresh processing based on the search data backed up in the RAM is started, and the same image data as the display screen displayed on the display 7 is read out by the distributor 3. Is instructed to the electronic file main body 1 through the electronic file. In response to this, image data retrieved and expanded in the video RAM 2 in the same manner as described above is extracted as an image signal, and transmitted to the interface 5 of the terminal device 4-1 to which access has been requested by the distributor 3. This is displayed on the display unit 7 again by the interface 5, and the refresh processing of the same screen information is completed. This process is repeated at each refresh timing to continue the screen display.

FIG. 2 is a flowchart illustrating an example of a display processing procedure of the terminal devices 4-1 to 4-N illustrated in FIG. Note that (1) to (11) indicate each step.

The interface 5 waits for search data for image display from the keyboard 8 (1). When the search data is input, the search data is stored in the RAM (2), and the search data is distributed to the distributor 3. (3).

Next, it is searched from the electronic file body 1 and the video RA
Waiting to receive the image signal stored in M2 (4),
When the image signal is received, the image signal is transferred to the display 7 (5), the refresh timing counting process is started (6), and the screen is displayed while holding the image signal as display data.

Next, it is determined whether the refresh timing has been reached (7), and if NO, the process returns to step (6), and YES
If so, the search data stored in the RAM is retransmitted to the electronic file body 1 via the distributor 3 (8).

Next, it waits for reception of the same signal as the displayed image signal (9), and upon completion of reception, retransmits the image signal to the display 7 to refresh the display data (10).

Next, it is determined whether or not the display is completed (11). If YES, the process is terminated. If NO, the process returns to step (6) to continue the display process.

In the above embodiment, the case where the timer 6 is provided in each of the terminal devices 4-1 to 4-N and the refresh timing of the display data is managed on the terminal side has been described, but the timer 6 is distributed as shown in FIG. The refresh timing may be managed on the device 3 side.

FIG. 3 is a system block diagram illustrating the configuration of an image display system to which a display control device according to another embodiment of the present invention can be applied, and the same components as those in FIG. 1 are denoted by the same reference numerals. .

In the figure, reference numeral 11 denotes a management data area, and each terminal device 4
-1 to 4-N are temporarily stored, and each terminal device 4 is stored in accordance with the count processing state of the timer 6.
The search data sent from -1 to 4-N is retransmitted to the electronic file body 1, and the image data stored in the video RAM 2 is output again to the interface 5 of each of the terminal devices 4-1 to 4-N as an image signal. .

Thereby, the configuration of each of the terminal devices 4-1 to 4-N can be further simplified, and the device can be downsized.

In the above embodiment, the case where the present invention is applied to a system network via a communication cable has been described. However, the present invention can be applied to an image display system using a communication line.

〔The invention's effect〕

As described above, according to the present invention, there is provided a display control device capable of displaying different image information on each of a plurality of display devices, a storage unit for storing the image information, and a storage capacity for at least one display screen. A transfer request receiving unit that receives a transfer request for image information from the plurality of display devices, and expands the image information to be displayed on one display device that has requested the transfer from the storage unit to the storage unit. Developing means, a supply means for supplying the image stored in the storage means to one display device which has requested transfer, and another processing means for ending the processing of one transfer request received by the transfer request receiving means. Control means for controlling the expansion means in order to perform a process in response to a transfer request from the display device.
Since the image display of a plurality of display devices is performed using one storage unit, even if image information to be displayed on the plurality of display devices is supplied to each display device, the same screen display is normally continued without causing image deterioration. Can be displayed.

In addition, since the display device uses a ferroelectric liquid crystal, display contents can be updated at a timing using the memory characteristics of the display device itself.

Further, since each of the plurality of display devices has a timer means and makes an image transfer request based on the timing of the timer means, it is necessary to always update the image information before the image information displayed on the display device disappears. Can be.

Therefore, the number of storage devices required in the related art can be reduced, the size of the entire device can be reduced, and an inexpensive display control device can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an image display system to which a display control device according to an embodiment of the present invention can be applied;
FIG. 2 is a flowchart showing an example of a display processing procedure of the terminal device shown in FIG. 1, and FIG. 3 explains a configuration of an image display system to which a display control device showing another embodiment of the present invention can be applied. FIG. 4 is a system block diagram illustrating a basic configuration of a conventional image display system, and FIG. 5 is a system block diagram illustrating a configuration of a conventional image display system. In the figure, 1 is an electronic file, 2 is a video RAM, 3 is a distributor, 4-1 to 4-N are terminal devices, 5 is an interface,
6 is a timer, 7 is a display, and 8 is a keyboard.

Claims (3)

(57) [Claims] 1. A display control device capable of displaying different image information on each of a plurality of display devices, comprising: storage means for storing image information; storage means having a storage capacity for at least one display screen; Transfer request receiving means for receiving a transfer request for image information from the plurality of display devices; developing means for developing image information to be displayed on one display device which has requested transfer from the storage means to the storage means; Supply means for supplying the image stored in the means to one display device which has requested transfer; and transfer request from another display device after ending the processing of one transfer request received by the transfer request receiving means. And a control means for controlling the developing means to perform processing on the display device, wherein one storage means is used to display images on a plurality of display devices. 2. The display control device according to claim 1, wherein the display device is a display device using a ferroelectric liquid crystal. 3. The display control device according to claim 1, wherein each of said plurality of display devices has timer means, and issues an image transfer request based on the time counted by said timer means.