JP2001195341A - Display adapter, display information provision method and setting method for information system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display adapter capable of performing optical communication advantageously in terms of costs with simple constitution and improving versatility. SOLUTION: A display cable 300 is provided with a connector part 320 connectable to a computer 100 and a display 200. The connector part 320 is constituted of a DDC controller 324 for controlling communication with the computer 100 or the display 200 and a nonvolatile memory 325 for storing EDID. At the time of detecting the pressing of a button 328 in the state of connecting the connector part 320 to the display 200, the DDC controller 324 acquires the EDID from the display 200 and stores it in the nonvolatile memory 325. When transmission is requested from the computer 100 in the state of connecting the connector part 320 to the computer 100, the EDID in the nonvolatile memory 325 is outputted to the computer 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adapter applied to a display cable having a signal line for transmitting a signal between a computer and a display, and a method of providing display information to a computer. The present invention relates to a display adapter, a display information providing method, and a setting method of an information system, which are capable of performing optical communication with a structure and advantageous in terms of cost and improving versatility.

[0002]

2. Description of the Related Art In order to properly display an image on a display in a computer, display information on the display includes a manufacturer name, a product code,
Information such as a serial number, vertical and horizontal screen sizes, compatible video timing, resolution, and inputtable synchronization signal frequency is required. Such display information is sent to EDID
(Extended Display Identification Data). Communication for acquiring EDID from a display is called DDC (Display Data Channel) communication.

[0003] For EDID and DDC communication, V
Standards created by ESA (Video Electronics Standards Association) (“DISPLAY DATA CHANNEL STANDA
RD ”Version1.0 Revision 1.0,1995)

Conventionally, as an apparatus for providing the EDID of a display to a computer, for example, Japanese Patent Application Laid-Open No. 11-23199
There is a display device disclosed in Japanese Patent No. 4 (hereinafter, referred to as a first conventional example) and a display adapter disclosed in WO95 / 30634 (hereinafter, referred to as a second conventional example).

In a first conventional example, an EDI of a display is used.
D is held by the display or the display controller, and the EDID of the display is required.
When the tingSystem) issues a request to the display controller, the display controller switches the DDC interface for the register storing the EDID of the display by the DDC interface selection control circuit, and acquires the EDID of the display.

A second conventional example is an EDID for a display.
Is provided in the display adapter and operates as follows.
In DDC1 (one of the three classes of DDC communication), a computer sends a data request signal to a nonvolatile memory via a receiver and a switch, and reads the EDID from the nonvolatile memory. Then, the data is supplied to the computer via the data terminal by the driver. In DDC2B (another one of the three classes of DDC communication), a data request signal is given by a computer, a part of the data request signal input via a receiver is decoded by a data request decoder, and a switch is turned on. A data request signal is supplied to the non-volatile memory via the non-volatile memory, and the EDID is read from the non-volatile memory. Then, the data is supplied to the computer via the data terminal by the driver.

[0007]

However, with the increase in the resolution of the display, in the data transmission between the computer and the display, in the data transmission in the analog system, the deterioration of the image due to noise / jitter is particularly long-distance transmission. In question. Therefore, in recent years, a digital interface has been used between a computer and a display. In this digital interface, a copper wire such as a twisted pair wire is used as a signal transmission medium, but a signal can be transmitted only over a distance of about 10 [m], and there is a certain limit to lengthening a display cable. In addition, since the computer and the display are electrically connected, noise from the computer is transmitted to the display, and noise from the display is transmitted to the computer. Could be affected.

Therefore, when it is necessary to increase the distance between the computer and the display due to the layout and the like, it is necessary to take some measures such as interposing a repeater between the computer and the display. Further, it is necessary to provide a circuit for noise suppression in the computer and the display.

[0009] Therefore, communication using an optical fiber is advantageous in preventing noise from the transmission side and performing long-distance transmission.

However, in the first conventional example, since the EDID of the display is obtained from the display, it is necessary to configure a transmission path for performing bidirectional communication between the computer and the display. is there. In order to perform two-way communication by optical fiber transmission, in addition to the downstream optical fiber for transmitting display control data and display data from the computer to the display, the EDID of the display is transmitted to the computer. Upward optical fiber, display E
A modulator for modulating the DID into an optical signal, a demodulation circuit for demodulating the optical signal from the display, and the like must be provided.

However, the reason that the computer needs the EDID is in a limited scene such as at the time of start-up.
Since the transmission speed of the ID is considerably lower than that of the display control data or the display data, performing expensive optical communication for transmitting the EDID not only complicates the system but also has poor cost performance.

From the viewpoint of simplification of the configuration and improvement of cost performance, a configuration in which display control data, display data, and the like are transmitted by optical communication and EDID is transmitted by a conventional copper wire may be considered. With such a configuration, it is impossible to prevent noise from the transmission side and to achieve long-distance transmission in EDID transmission.

On the other hand, in the second conventional example, since the EDID of the display is stored in the nonvolatile memory of the display adapter in advance, only the display corresponding to the EDID can be connected to the computer. In other words, to connect a different display to the computer, it is necessary to prepare another display adapter that stores the EDID of the display, which is less versatile.

Therefore, the present invention has been made in view of such unresolved problems of the conventional technology, and can perform optical communication with a simple configuration and in terms of cost. It is another object of the present invention to provide a display adapter, a display information providing method, and an information system setting method capable of improving versatility.

[0015]

According to a first aspect of the present invention, there is provided a display adapter for outputting display information relating to a display to a computer. A connectable connection terminal, storage means for storing the display information, and communication control means for performing communication control with the computer or the display via the connection terminal, the communication control means, Display information is obtained from the display, stored in the storage means, and the display information of the storage means is output in response to a request from the computer.

With such a configuration, to provide display information to the computer, first, a connection terminal is connected to the display. When the connection terminal is connected to the display, the communication control means obtains display information from the display via the connection terminal, and stores the obtained display information in the storage means. Next, the connection terminal is disconnected from the display and connected to the computer. When the connection terminal is connected to the computer, display information of the storage means is output via the connection terminal in response to a request from the computer.

Here, the display information refers to information relating to the display, and includes, for example, a maker name, a product code, a serial number, a vertical and horizontal screen size, an applicable video timing, a resolution, and an inputtable synchronization signal. Information such as frequency is included. Hereinafter, Claim 2
The same applies to the display adapter described above, the display information providing method described in claims 10 and 11, and the information system setting method described in claim 11.

The storage means stores display information by any means and at any time.
The display information may be stored in advance, or the display information may be stored when the adapter operates. Hereinafter, the same applies to the display adapter according to the second aspect.

A display adapter according to claim 2 of the present invention is an adapter applied to a display cable having a signal line for transmitting a signal between a computer and a display. A connection terminal connectable to the display, storage means for storing display information about the display, and communication control means for performing communication control with the computer or the display via the connection terminal, the communication control means Thus, the display information is obtained from the display, stored in the storage unit, and the display information of the storage unit is output in response to a request from the computer.

With such a configuration, to provide display information to the computer, first, the connection terminal is connected to the display. When the connection terminal is connected to the display, the communication control means obtains display information from the display via the connection terminal, and stores the obtained display information in the storage means. Next, the connection terminal is disconnected from the display and connected to the computer. When the connection terminal is connected to the computer, display information of the storage means is output via the connection terminal in response to a request from the computer.

When the display cable is used to connect the computer to the display, signals are transmitted between the computer and the display via signal lines.

According to a third aspect of the present invention, in the display adapter according to the second aspect, the connection terminal is connected to one end of the signal line, and the computer or the display is connected to the signal line. And a terminal capable of transmitting a signal to and from the terminal.

With this configuration, the display information is transmitted through the connection terminal and the signal is transmitted between the computer or the display and the signal line through the connection terminal and the signal line. Further, no special connector for signal lines is required.

Therefore, in order to provide the computer with the display information, the connection terminal may be connected to the display to obtain the display information, and then the display cable may be reversed and the computer and the display may be connected again. After that, while maintaining that connection state,
The display information of the storage means is output in response to a request from the computer, and signals such as display control data and display data are transmitted between the computer and the display.

According to a fourth aspect of the present invention, there is provided a display adapter according to any one of the second and third aspects, wherein the connection terminal comprises:
The connector section of the display cable, wherein the storage section and the communication control section are provided in the connector section.

With such a configuration, since the storage means and the communication control means are provided in the connector portion, when the connector portion is connected to the display, the communication control means is located immediately near the display. The transmission distance between the display and the communication control means becomes constant. Also,
When the connector section is connected to the computer, the communication control means is located in the immediate vicinity of the computer, and the transmission distance between the computer and the communication control means becomes constant.
The same applies to the transmission distance between the communication control means and the storage means.

According to a fifth aspect of the present invention, in the display adapter according to any one of the second to fourth aspects, the signal line is an optical fiber.

With this configuration, the display information is transmitted through the connection terminal, and the signal is transmitted between the computer or the display and the signal line through the connection terminal and the optical fiber.

According to a sixth aspect of the present invention, in the display adapter according to the fifth aspect, one connector of the display cable converts an electric signal into an optical signal and converts the electric signal into the optical signal. The display cable has a light emitting unit that emits light to the fiber, and the other connector unit of the display cable has a light receiving unit that converts an optical signal incident from the optical fiber into an electric signal.

With such a configuration, when one connector of the display cable is connected to the computer and the other connector of the display cable is connected to the display, an electric signal from the computer is transmitted to the one connector. Is input to the light-emitting unit via the light-emitting unit, and the input electric signal is converted into an optical signal by the light-emitting unit and emitted to the optical fiber. When an optical signal is emitted to the optical fiber, the optical signal is incident on the light receiving unit via the optical fiber, and the incident optical signal is converted into an electric signal by the light receiving unit,
The converted electric signal is output to the display via the other connector.

In the case where the storage means and the communication control means are provided in the connector section as in the display adapter according to the fourth aspect, the connector section may be either connector section of the display cable. However, from the viewpoint of improving the usability, it is preferable to use one of the connector portions of the display cable. That is, with such a configuration, after the display information is obtained, the display cable is reversed, and the computer and the display are reconnected, the computer can be used while maintaining the connection state.

Further, a display adapter according to a seventh aspect of the present invention is the display adapter according to any one of the first to sixth aspects, further comprising an input unit for inputting an instruction to acquire the display information, The communication control means obtains the display information from the display when an input is made by the input means.

With this configuration, in order to acquire display information, an instruction to acquire display information is input from the input unit. When there is an input from the input means, display information is obtained from the display via the connection terminal by the communication control means, and the obtained display information is stored in the storage means.

Further, the display adapter according to claim 8 of the present invention is the display adapter according to any one of claims 1 to 7, wherein the storage means includes:
It is composed of a nonvolatile storage element.

With such a configuration, the obtained display information is stored in the nonvolatile storage element by the communication control means.

Further, according to a ninth aspect of the present invention, in the display adapter according to any one of the first to seventh aspects, the storage means comprises:
It consists of a data rewritable storage element.

With such a configuration, the acquired display information is stored in the data rewritable storage element by the communication control means.

[0038] On the other hand, in order to achieve the above object, a display information providing method according to claim 10 of the present invention comprises:
A method of providing display information about a display to a computer, comprising: connecting a connection terminal connectable to the computer and the display to the display; and obtaining the display information from the display via the connection terminal. Storing in a storage means, disconnecting the connection terminal from the display and connecting to the computer,
Outputting display information of the storage means via the connection terminal in response to a request from the computer.

Further, a display information providing method according to claim 11 of the present invention is a method for providing the display information to a computer using the display adapter according to any one of claims 1 to 9, Connecting the connection terminal to the display;
Acquiring the display information from the display and storing the display information in the storage unit; and disconnecting the connection terminal from the display to connect to the computer.

On the other hand, in order to achieve the above object, a method for setting an information system according to claim 12 of the present invention comprises a display, a computer, and a display adapter according to any one of claims 1 to 9. A method of setting an information system, comprising: connecting the connection terminal to the display; acquiring the display information from the display and storing the display information in the storage unit; and connecting the connection terminal to the display. Disconnecting and connecting to the computer, including outputting display information stored in the storage means to the computer via the connection terminal in response to a request from the computer,
The image information and the control information are set to be transmittable between the computer and the display.

[0041]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are views showing an embodiment of a display adapter, a display information providing method, and an information system setting method according to the present invention.

In the present embodiment, the display adapter, the display information providing method, and the information system setting method according to the present invention are described with reference to FIG. This is applied to a display cable 300 for transmitting data and the like.

First, the display cable 30 to which the display adapter, the display information providing method, and the information system setting method according to the present invention are applied.
0 will be described with reference to FIG. FIG. 2 is a block diagram showing a configuration of the display cable 300.

As shown in FIG. 2, the display cable 300 is connected to one end of the optical fiber 310 and an optical fiber 310 for transmitting display control data, display data, and the like from the computer 100 to the display 200. Computer 100 and display 200
A connector section 320 connectable to both the optical fiber 3
10 and a connector section 330 connectable to the display 200.

The connector section 320 has an SDA terminal 321 for inputting / outputting serial data by DDC communication,
SC for inputting / outputting a clock signal by DDC communication
An L terminal 322 and a data terminal 323 for inputting display control data, display data, and the like from the computer 100
Communication control with the display 200 through the SDA terminal 32
1 and a SDC terminal 322, a DDC controller 324, a non-volatile memory 325 for storing EDID, and a light emitting device that converts an electric signal input through the data terminal 323 into an optical signal and emits the optical signal to the optical fiber 310. An indicator 327 for notifying that the storage of the EDID in the nonvolatile memory 325 has been completed;
And a button 328 for inputting a D acquisition instruction.

The DDC controller 324 operates the button 3 with the connector unit 320 connected to the display 200.
28 is detected, the display 200 and D
By performing DC communication, the ED of the display 200 is
The ID is acquired from the display 200 and the acquired EDI
D is temporarily stored in the internal memory 324a.
The EDID of a is stored in the nonvolatile memory 325. When the EDID storage is completed, the display lamp 327 is turned on to notify that the EDID storage is completed.

The connector section 330 includes a light receiving section 332 for converting an optical signal from the optical fiber 310 into an electric signal, and a data terminal 334 for outputting display control data, display data, and the like from the computer 100. I have.

The computer 100 has a DDC controller (not shown), and this DDC controller is connected to the computer 100 when an EDID transmission request is issued from the computer 100 with the connector section 320 connected to the computer 100. By performing the DDC communication, the EDID in the non-volatile memory 325 is read and output to the computer 100 in response to a transmission request from the computer 100.

Next, the operation of the above embodiment will be described with reference to FIGS. FIG. 3 shows the display 2
FIG. 4 is a diagram for explaining a case where EDID is obtained from 00, and FIG. 4 is a diagram for explaining a case where EDID is provided to the computer 100.

To provide the computer 100 with the EDID, first, the EDID is obtained from the display 200. For this, the connector section 320 is connected to the display 200.
, And the button 328 is pressed in this state. When the button 328 is pressed, as shown in FIG. 3, the DDC controller 324 sends the EDID from the EDID storage memory 210 of the display 200 through the connector unit 320.
Is acquired, the acquired EDID is temporarily stored in the memory 324a, and the EDID of the memory 324a is stored in the nonvolatile memory 325.

Next, the connector section 320 is disconnected from the display 200 and connected to the computer 100, and the connector section 330 is connected to the display 200. Thus, the computer 100 and the display 20
0 and the computer 100
When there is a transmission request for D, as shown in FIG. 4, a DDC controller (not shown) provided on the computer 100 side responds to the transmission request from the computer 100,
The EDID in the nonvolatile memory 325 is read and output to the computer 100.

In the state where the computer 100 and the display 200 are connected as described above, the computer 1
When display control data, display data, and the like are output from 00, a signal from the computer 100 is input to the light emitting unit 326 via the data terminal 323, and the input signal is converted into an optical signal by the light emitting unit 326. Optical fiber 3
Injected into 10. When an optical signal is emitted to the optical fiber 310, the optical signal is transmitted through the optical fiber 310 to the light receiving unit 33.
2 is converted into an electric signal by the light receiving unit 332, and the converted electric signal is converted into a signal processing circuit 2 of the display 200 via the data terminal 334.
20.

As described above, in the present embodiment, the connector section 320 which can be connected to the computer 100 and the display 200 is provided, and the connector section 320 controls communication with the display 200 by the SDA terminals 321 and SDA.
DDC controller 324 performed through CL terminal 322
And a nonvolatile memory 325 including a nonvolatile storage element for storing the EDID. The DDC controller 324 acquires the EDID from the display 200 and stores the EDID in the nonvolatile memory 325. The EDID of the memory 325 is stored in the computer 100
Is output to the computer 100 in response to a request from the computer 100.

Thus, the EDI of the display 200
D for transmitting the signal D to the computer 100, a modulator for modulating the EDID of the display 200 into an optical signal, a demodulating circuit for demodulating the optical signal from the display 200, and the like. Can transmit display control data, display data, and the like to the display 200 by optical communication, and can provide the computer 100 with EDID in response to a request from the computer 100. Also,
In order to connect a different display to the computer 100, it is only necessary to connect the connector unit 320 to the display and obtain its EDID, so that one display cable 300 can be reused many times.

Therefore, optical communication can be advantageously performed with a simple configuration and in terms of cost as compared with the related art, and versatility can be improved.

Further, in this embodiment, the connector 3
20 is connected to one end of the optical fiber 310 and is connected to the computer 100 or the display 200 and the optical fiber 31.
It includes a terminal capable of transmitting a signal between 0 and 0.

Thus, by simply connecting the connector unit 320 to the computer 100, display control data, display data, and the like from the computer 100 can be transmitted to the display 200 by optical communication. ED on computer 100
An ID can be provided.

Further, in the present embodiment, the DDC controller 324 and the nonvolatile memory 325 are provided in the connector section 320.

Thus, when the connector section 320 is connected to the display 200, the DDC controller 32
4 will be located in the immediate vicinity of the display 200,
The transmission distance between the display 200 and the DDC controller 324 can be made constant. In addition, when the connector unit 320 is connected to the computer 100, the DDC controller 324 is located in the immediate vicinity of the computer 100, so that the transmission distance between the computer 100 and the DDC controller 324 can be kept constant.

Therefore, even if the optical cable 310 (the cable 300 in FIG. 1) becomes longer, the communication between the display 200 or the computer 100 and the DDC controller 324 is not affected. That is, DDC communication can be performed with a constant quality regardless of the length of the optical cable 310 (the cable 300 in FIG. 1).

Further, in the present embodiment, the connector 3
20 has a light emitting unit 326 for converting an electric signal into an optical signal and emitting the optical signal to the optical fiber 310;
0 has a light receiving unit 332 that converts an optical signal incident from the optical fiber 310 into an electric signal.

As a result, it is not necessary to add a new configuration to the conventional computer and display, and the present invention can be applied to the conventional computer and display as it is.

Further, in this embodiment, the connector 3
20 is connected to the display 200 and pressing the button 328 obtains the EDID from the display 200 and stores it in the nonvolatile memory 325.

As a result, the display 200
To obtain the ID, it is only necessary to connect the connector unit 320 to the display 200 and go through the procedure of pressing the button 328. Therefore, the EDID can be obtained from the display 200 relatively easily.

Further, in this embodiment, the nonvolatile memory 325 is composed of a nonvolatile storage element, and uses an element from which data can be read and to which data can be written. Specifically, a ferroelectric memory element is used.

Thus, the memory 325 is stored in the volatile RA
M and the like, a power source such as a battery required for storing
Need not be provided.

Further, in this embodiment, the indicator 327 for notifying that the storage of the EDID is completed in the nonvolatile memory 325 is provided.

Thus, the ED is stored in the nonvolatile memory 325.
Since the completion of the storage of the ID can be grasped from the outside, before the storage of the EDID in the non-volatile memory 325 is completed, the connector unit 320 is removed from the display 200 or the like, and the acquisition of the EDID fails. It is possible to relatively reduce the possibility of the occurrence.

In the above embodiment, the EDID corresponds to the display information described in the first, second, seventh, tenth, eleventh or twelfth aspect, and the connector section 320 corresponds to the first to fourth, tenth, eleventh or twelfth aspect. The connector terminal corresponds to the connector terminal described in claim 4, the connector portion described in claim 4, or the one connector portion described in claim 6, and the connector portion 330 corresponds to the other connector portion described in claim 6.

In the above embodiment, the non-volatile memory 325 corresponds to the storage means described in claims 1, 2, 4, 8 to 12, and the DDC controller 324 corresponds to claim 1, 2, 4, or 7. Corresponding to the described communication control means,
The button 328 corresponds to the input unit described in claim 7, and the optical fiber 310 corresponds to the signal line described in claim 2, 3, or 5.

In the above embodiment, the light emitting section 326 is provided in the connector section 320 and the light receiving section 332 is provided in the connector section 330. However, the present invention is not limited to this. The light receiving section 332 may be provided on the display 200.

Further, in the above embodiment, the display adapter, the display information providing method, and the information system setting method according to the present invention, as shown in FIG.
Although the present invention has been applied to the display cable 300 for transmitting display control data, display data, and the like between the present embodiment and the present invention, the present invention is not limited to this, and can be applied to other cases without departing from the gist of the present invention.

[0073]

As described above, according to the display adapter according to the first to ninth aspects of the present invention, it is possible to perform optical communication with a simple configuration and in terms of cost as compared with the related art. And the versatility can be improved.

Further, according to the display adapter of the third aspect of the present invention, display control data and display data from the computer can be transmitted to the display by optical communication only by connecting the connection terminal to the computer. And display information can be provided to the computer in response to a request from the computer.

Further, according to the display adapter of the fourth aspect of the present invention, it is possible to perform communication with a constant quality between the computer or the display and the communication control means regardless of the length of the signal line. The effect is also obtained.

Further, according to the display adapter of the sixth aspect of the present invention, there is obtained an effect that it can be applied to a conventional computer and display as it is.

Further, according to the display adapter according to the seventh aspect of the present invention, it is possible to obtain an effect that display information can be obtained relatively easily from the display.

Further, according to the display adapter of the present invention, a power source such as a battery required for storing the display information is provided in comparison with a case where the storage means is constituted by a RAM or the like. The effect that there is no need to provide the cable is also obtained.

On the other hand, claim 10 or claim 11 according to the present invention.
According to the display information providing method described, optical communication can be advantageously performed in a simple configuration and in terms of cost as compared with the related art, and versatility can be improved.
Further, an effect is obtained that display information can be obtained relatively easily from the display.

On the other hand, according to the information system setting method according to claim 12 of the present invention,
Optical communication can be performed advantageously with a simple configuration and in terms of cost, versatility can be improved, and display information can be obtained relatively easily from a display. Can be

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a display adapter, a display information providing method, and an information system setting method according to the present invention.

FIG. 2 is a block diagram showing a configuration of a display cable 300.

FIG. 3 is a diagram for describing a case where an EDID is obtained from a display 200.

FIG. 4 is a diagram for explaining a case where an EDID is provided to the computer 100;

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 computer 200 display 210 EDID storage memory 220 signal processing circuit 300 display cable 310 optical cable 320, 330 connector section 321 SDA terminal 322 SCL terminal 323, 334 data terminal 324 DDC controller 325 nonvolatile memory 326 light emitting section 327 indicator light 328 button 332 light receiving Department

Claims (12)

[Claims] 1. An adapter for outputting display information related to a display to a computer, comprising: a connection terminal connectable to the computer and the display; a storage unit for storing the display information; and the computer or the display. Communication control means for performing communication control through the connection terminal, wherein the communication control means acquires the display information from the display and stores the display information in the storage means, and in response to a request from the computer, A display adapter adapted to output display information of a storage means. 2. An adapter applied to a display cable having a signal line for transmitting a signal between a computer and a display, comprising: a connection terminal connectable to the computer and the display; and display information related to the display. And a communication control means for performing communication control with the computer or the display via the connection terminal, wherein the communication control means obtains the display information from the display, and A display adapter which is stored in a storage unit and outputs display information of the storage unit in response to a request from the computer. 3. The terminal according to claim 2, wherein the connection terminal includes a terminal connected to one end of the signal line and capable of transmitting a signal between the computer or the display and the signal line. Display adapter. 4. The display according to claim 2, wherein the connection terminal is a connector section of the display cable, and the storage section and the communication control section are provided in the connector section. adapter. 5. The display adapter according to claim 2, wherein the signal line is an optical fiber. 6. The display cable according to claim 5, wherein one of the connector portions of the display cable has a light emitting portion that converts an electric signal into an optical signal and outputs the optical signal to the optical fiber. The display adapter has a light receiving unit that converts an optical signal incident from the optical fiber into an electric signal. 7. The display device according to claim 1, further comprising an input unit for inputting an instruction to acquire the display information, wherein the communication control unit is configured to display the display information when an input is made by the input unit. A display adapter adapted to obtain information from said display. 8. The display adapter according to claim 1, wherein the storage unit includes a nonvolatile storage element. 9. The display adapter according to claim 1, wherein said storage means comprises a data rewritable storage element. 10. A method of providing display information on a display to a computer, comprising: connecting a connection terminal connectable to the computer and the display to the display; and transmitting the display information via the connection terminal. Obtaining from a display and storing it in storage means, disconnecting the connection terminal from the display and connecting to the computer, and displaying the display information of the storage means via the connection terminal in response to a request from the computer. And outputting the display information. 11. A method of providing the display information to a computer using the display adapter according to claim 1, wherein the connection terminal is connected to the display, and the display information is provided. Acquiring from the display and storing it in the storage means; and disconnecting the connection terminal from the display and connecting to the computer. 12. A setting method for an information system comprising a display, a computer, and the display adapter according to claim 1, wherein the connection terminal is connected to the display. Obtaining the display information from the display and storing the display information in the storage means, disconnecting the connection terminal from the display and connecting to the computer, and storing the display information in the storage means in response to a request from the computer. Outputting the display information to the computer via the connection terminal, and setting the image information and the control information to be transmittable between the computer and the display. Setting method.