JP2006308658A - Display management system and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display management system and a display system, by which setting of luminance and contrast of many displays to be simultaneously used, etc. is held and each user's changing the settings is prevented. <P>SOLUTION: A display 4 receives a signal for instructing lock of screen display function from a connected terminal PC 3 (or a PC1 for management connected via a network). A control part 12 of the display 4 makes lock information, being developed in a built-in RAM, into a locked state. When a user performs operation for changing the screen display function from an operation part 14, the lock information developed in the built-in RAM is read; and when the lock information is at the locked state, the screen display function is not changed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a display management system and a display device that can hold various settings of a display.

  A general display used in an information processing apparatus such as a personal computer is configured such that a user arbitrarily sets and changes screen display functions such as brightness, contrast, screen display position, and color temperature.

  That is, it is assumed that buttons and the like for adjusting brightness and contrast are provided on the front surface of the display, and the user manually operates them to change the settings so that they are easy to see.

  However, many schools and companies use the same display at the same time (personal computer operation classes, etc.). In such a case, the brightness and contrast must be set to the same settings on all displays. Is desired. However, in schools and the like, it is highly likely that students will operate the buttons on the front of the display in an interesting manner, and the screen display function is likely to be changed by mistake.

  In addition, when exhibiting a large number of displays at a store or the like, it is desired to display with the brightness and contrast set to the best state. However, a malicious person intends to lower the display quality. May change the screen display function.

In view of such circumstances, a display having a lock function for preventing a change in setting has been considered. Also, in order to prevent setting changes, there has been proposed one in which the operation unit for screen adjustment is a hidden switch (for example, see Patent Document 1).
JP 2000-242432 A

  A display with a lock function retains setting information so that the adjusted screen display function cannot be changed by another user by performing a special operation (such as turning on the power while pressing a certain button). Even if the button is operated, the setting change according to this is not performed.

  Further, the display device (display) described in Patent Document 1 prevents the screen display function from being changed by another user by using a screen adjustment operation unit as a hidden switch such as a transparent touch panel. It is.

  However, if the unlocking method is simple (such as pressing a button), there is a possibility that students may perform various operations with interest in the buttons at school, etc. Had the potential to change. Similarly, a hidden switch such as a transparent touch panel has a possibility that a student may touch the screen with interest and there is a possibility that the screen display function may be changed by unintentionally operating this switch.

  In addition, in a store or the like, if the unlocking method is simple, a malicious person can release such a lock, and the manual etc. describes a method for releasing the lock, There was a possibility that the screen display function was changed by others. Since the location of the hidden switch such as the transparent touch panel is described in the manual or the like, the screen display function may still be changed by another person.

  Further, when a large number of displays are used simultaneously, there is a problem that it is troublesome for an administrator to lock one display at a time.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a display management system and a display device that can maintain brightness and contrast settings of a display that is used at the same time and prevent each user from changing the settings.

  The invention according to claim 1 is a display management system comprising a management device, a terminal device connected to the management device via a network, and a display device connected to the terminal device, wherein the management The control device includes control information transmitting means for transmitting control information for controlling the terminal device, and the terminal device changes various settings to the connected display device based on the control information received from the management device. Lock information transmitting means for transmitting lock information for prohibiting change and unlock information for canceling change prohibition, and the display device includes: an operation means for performing an operation for a user to change various settings; and The storage means for storing the received lock information or unlock information, and the operation if the unlock information is stored in the storage means when the operation means is operated. In response to change the various settings, and a display control unit is not modified settings in accordance with the operation if lock information is stored, comprising the.

  In the present invention, the management apparatus (server PC) transmits control information so that information indicating locking and unlocking is transmitted from the terminal apparatus (terminal PC) to the display apparatus (display). The display device disables changing of various settings (for example, a screen display function) when receiving information instructing locking, and releases the change prohibiting state of the screen display function when receiving information instructing unlocking. The locked state and unlocked state are stored in a memory built in the display device, and the state is maintained until the power is turned off.

  The invention according to claim 2 is a display management system including a terminal device and a display device connected to the terminal device, and the terminal device prohibits changing of various settings to the connected display device. Lock information transmitting means for transmitting lock information to be released and unlock information for canceling the prohibition of change, and the display device is transmitted from the terminal device and operation means for performing an operation for changing various settings by the user. The storage means for storing the incoming lock information or unlock information, and when the operation means is operated, if the unlock information is stored in the storage means, various settings are changed according to the operation. And display control means that does not change various settings according to the operation if lock information is stored.

  In this invention, the terminal device (terminal PC) transmits information indicating locking and unlocking to the display device (display). The display device disables changing of various settings (for example, a screen display function) when receiving information instructing locking, and releases the change prohibiting state of the screen display function when receiving information instructing unlocking. The locked state and unlocked state are stored in a memory built in the display device, and the state is maintained until the power is turned off.

  According to a third aspect of the present invention, in the above invention, the storage unit stores a lock holding time indicating a time limit for holding storage of lock information prohibiting change of various settings, and the display control unit stores the storage After the lock information is stored in the means, the lock information is changed to unlock information when the lock holding time stored in the storage means elapses.

  In the present invention, the prohibition state is canceled after a predetermined time has elapsed since the change of the screen display function is prohibited. The time for holding the prohibited state is stored in a memory built in the display device.

  According to a fourth aspect of the present invention, in the above invention, the terminal device is provided with time change information transmitting means for transmitting holding time change information for changing the lock holding time stored in the storage means of the display device, The display control means of the display device changes the lock holding time stored in the storage means based on the received holding time change information.

  In the present invention, information for changing the time for releasing the prohibited state is transmitted from the terminal device, and the time for holding the prohibited state stored in the memory built in the display device is changed.

  According to a fifth aspect of the present invention, in the above invention, the storage unit further stores message data indicating a change prohibition state of various settings, and the display control unit is configured such that when the operation unit is operated, If lock information is stored in the storage means, the message data stored in the storage means is synthesized and displayed on the screen.

  In the present invention, message data is stored in a memory built in the display device, and the message data is displayed on the screen. For example, the content indicating that it is in a locked state is displayed.

  According to a sixth aspect of the present invention, in the above invention, the terminal device is provided with message change information transmitting means for transmitting message change information for changing message data stored in the storage means of the display device, and the display The display control means of the apparatus changes the message data stored in the storage means based on the received message change information.

  In the present invention, information for changing message data is transmitted from the terminal device, and the message data stored in the memory built in the display device is changed.

The invention according to claim 7 is a display device connected to a terminal device and receiving information,
An operation means for performing an operation for changing various settings by a user, a storage means for storing instruction information transmitted from the terminal device, a display control means for changing various settings in accordance with an operation of the operation means, The display control means stores, in accordance with the instruction information received from the terminal device, the storage means for storing lock information for prohibiting change of various settings or unlock information for releasing change prohibition, and for operating means. When the above operation is performed, the storage means is read out, and if the lock information is stored, various settings are not changed according to the operation.

  In this invention, the information which instruct | indicates locking and unlocking is received from a terminal device. The display device disables changing of various settings (for example, a screen display function) when receiving information instructing locking, and releases the change prohibiting state of the screen display function when receiving information instructing unlocking. The locked state and unlocked state are stored in a memory built in the display device, and the state is maintained until the power is turned off.

  According to an eighth aspect of the present invention, in the above invention, the storage unit stores a lock holding time indicating a time limit for holding storage of lock information prohibiting change of various settings, and the display control unit stores the storage After the lock information is stored in the means, the lock information is changed to unlock information when the lock holding time stored in the storage means elapses.

  In the present invention, the prohibition state is canceled after a predetermined time has elapsed since the change of the screen display function is prohibited. The time for holding the prohibited state is stored in a built-in memory.

  According to a ninth aspect of the present invention, in the above invention, the display control unit receives the holding time change information for changing the lock holding time stored in the storage unit of the display device from the terminal device, and the received holding The lock holding time stored in the storage means is changed based on the time change information.

  In the present invention, the time for canceling the prohibited state is changed according to an instruction from the terminal device or the management device.

  According to a tenth aspect of the present invention, in the above invention, the storage unit further stores message data indicating a change prohibition state of various settings, and the display control unit is configured such that when the operation unit is operated, If lock information is stored in the storage means, the message data stored in the storage means is synthesized and displayed on the screen.

  In the present invention, message data is stored in a built-in memory, and this message data is displayed on the screen. For example, the content indicating that it is in a locked state is displayed.

  According to an eleventh aspect of the present invention, in the above invention, the display control means receives message change information for changing message data stored in the storage means of the display device from the terminal device, and receives the received message change information. The message data stored in the storage means is changed based on the above.

  In the present invention, information for changing message data from the terminal device is received from the terminal device or the management device, and the message data stored in the memory is changed.

  As described above, according to the present invention, it is prohibited to change screen display functions such as brightness and contrast from a terminal device connected to a display device or a management device connected to a network. By adopting a configuration in which the lock can be released only from the device, the lock cannot be released even if each user operates a button or the like on the display, and the setting change can be prevented.

  Further, it is possible to prevent each user from changing the setting without having to lock a large number of displays one by one by the administrator.

  In addition, since a message indicating that the screen is locked is displayed on the screen, each user can know that the screen display function is locked. It is possible to prevent making unnecessary inquiries.

  In addition, it is possible to display information indicating the contact information of the administrator, the reason for locking, etc. on the screen, and this content can be arbitrarily changed by the administrator, so that each user's misunderstanding about the locked state can be solved. Can be flexibly handled by the administrator when unlocking.

The display management system of this embodiment is a PC system that includes a personal computer (hereinafter referred to as a PC) and a display. By transmitting control signals from the PC to the display, screen display functions such as brightness and contrast are provided. Changes can be prohibited. In addition, by connecting a management PC to a plurality of PC systems and giving a control instruction to each PC from the management PC, an instruction for prohibiting changing the display function of all the PC systems collectively is issued. As a result, it is not possible to change the settings from the buttons for adjusting the brightness and contrast provided on the front surface of the display, and it is not necessary for the administrator to lock the displays one by one. The setting is retained, and each user can be prevented from changing the setting.
Hereinafter, a display management system according to an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a display management system according to an embodiment of the present invention. The display management system includes a management PC 1, a LAN 2, a terminal PC 3, and a plurality of displays 4 connected to each terminal PC 3. As described above, as a system constituted by the management PC 1, the plurality of terminals PC3, and the display 4 connected to each terminal PC3, a school education site (PC installation classroom) or the like is assumed.

  The management PC 1 is connected to each terminal PC 3 via the LAN 2 and can perform data transmission / reception with each terminal PC 3. The LAN 2 may be wired or wireless. The management PC 1 and each terminal PC 3 perform data transmission / reception by TCP / IP.

  The terminal PC3 is connected to the display 4 with a general-purpose video signal cable such as an analog (RGB) connection cable or a digital (DVI) cable. The terminal PC 3 transmits a video signal for screen display and a control signal for controlling the display 4 to the display 4. The control signal is transmitted as a control command by DDC / CI (Display Data Channel Command Interface) that is a standard defined by VESA (Video Electronics Standards Association).

  The display 4 is a display for a PC, and is composed of, for example, an LCD, a CRT, or the like. In the present embodiment, a display 4 constituted by an LCD will be described. FIG. 2 is a block diagram showing the display 4 in detail. As shown in the figure, the display 4 includes an interface 10 that performs data transmission / reception with the terminal PC 3, an image processing unit 11 that performs screen display processing from a video signal received from the terminal PC 3 via the interface 10, and an interface 10. Various operations are performed based on the control signal received from the terminal PC 3, and the control unit 12 that controls each function unit of the display 4, the ROM 13 that is a storage unit, and the operation unit 14 that performs an operation of changing the screen display function by the user. A display unit 15 that is a liquid crystal display panel that displays a screen under the control of the image processing unit, a power supply unit 16 that supplies power to the display 4 from a household outlet, a backlight 17 that illuminates the liquid crystal display panel, and an input audio signal A sound processing unit 18 for processing (volume control), and a speed for sound generation from the input sound signal. It is equipped with a mosquito 19.

  The interface 10 is a general-purpose video signal input interface including an analog video input terminal (D-SUB) and a digital DVI input terminal.

  An interface 10, a control unit 12, and a display unit 15 are connected to the image processing unit 11. The image processing unit 11 drives the liquid crystal panel of the display unit 15 based on the video signal received from the terminal PC 3 via the interface 10. Further, the image processing unit 11 incorporates an A / D converter as necessary, and converts an analog video signal into a digital signal and performs processing when an analog video signal is received.

  The control unit 12 is connected to the interface 10, the image processing unit 11, the ROM 13, the operation unit 14, the power supply unit 16, the backlight 17, and the sound processing unit 18. The control unit 12 is configured by a microcomputer with a built-in RAM. The control unit 12 reads various settings stored in the ROM 13 and develops them in a built-in RAM to control the connected image processing unit 11, power supply unit 16, backlight 17, and audio processing unit 18. . When the user first connects the power outlet, the default setting information stored in the ROM 13 is read and expanded in the RAM.

  The control unit 12 controls the image processing unit 11 according to various setting information (contrast setting information, color temperature setting information, etc.) developed in the RAM, and sets the contrast of the liquid crystal panel of the display unit 15. Further, the message data (font, text data, etc.) stored in the ROM 13 is expanded in the RAM, and this message data is output to the image processing unit 11. The image processing unit 11 combines the input message data on the OSD and displays it on the display unit 15. This is an OSD menu or the like displayed on the display unit 15 of the display 4.

  Similarly, the control unit 12 sets the luminance of the backlight 17 according to the luminance setting information developed in the RAM. The backlight 17 illuminates the liquid crystal panel with the set brightness. In this way, the control unit 12 controls the screen display function of the display 4. Further, the control unit 12 controls the power supply unit 16 to turn on / off the display 4 and controls the audio processing unit 18 to set the volume and the like. The sound processing unit 18 outputs a sound signal at the set volume and produces sound from the speaker 19. Here, the power off means not turning off the power supply of the display 4 (eg, cutting off the power supply by disconnecting the power outlet), but turning off the backlight 17 or stopping the driving of the display unit 15. It is to do (standby state).

  The operation unit 14 is used by the user to change the screen display function, and inputs operation information to the control unit 12 in accordance with the user operation. The control unit 12 rewrites information in the RAM in accordance with user operation information input from the operation unit 14. The control unit 12 controls the image processing unit 11, the power supply unit 16, the backlight 17, and the sound processing unit 18 with the contents of the rewritten RAM. For example, when the user performs a change operation to increase the brightness, the brightness setting information developed in the RAM is rewritten, and the brightness of the backlight 17 is changed according to this content. Specifically, when the user operates the operation unit 14, the control unit 12 transmits data for displaying the OSD menu to the image processing unit 11, and the image processing unit 11 displays the OSD menu on the display unit 15. The user operates the operation unit 14 with reference to the displayed OSD menu, and performs an operation of changing the brightness setting.

  Thus, the user can change the brightness, contrast, and the like by operating the operation unit 14. Further, the changed contents of the RAM can be output to the ROM 13 and stored. That is, the ROM 13 is composed of a rewritable EEPROM or the like.

Next, a case where the display 4 operates according to a control signal transmitted from the terminal PC3 will be described.
The control unit 12 controls the connected image processing unit 11, power supply unit 16, backlight 17, and audio processing unit 18 based on a control signal (DDC / CI) transmitted from the terminal PC 3 via the interface 10. I do. The terminal PC3 incorporates software for transmitting such control signals. For example, an administrator of a PC installation classroom or the like operates the software to transmit control signals from the terminal PC3 to the display 4.

  The control unit 12 rewrites the information developed in the RAM based on the control signal received from the terminal PC3. For example, when a control signal is transmitted from the terminal PC 3 so as to change the contrast setting information, the contrast setting information developed in the RAM is rewritten accordingly. The image processing unit 11 is controlled according to the rewritten RAM setting information (contrast setting, color temperature setting name, etc.), and the contrast of the liquid crystal panel of the display unit 15 is set. Similarly, when a control signal is transmitted from the terminal PC 3 so as to change the luminance setting information, the control unit 12 rewrites the luminance setting information developed in the RAM according to the control signal, and rewrites the RAM setting. The brightness of the backlight 17 is set according to the information. In addition, the control unit 12 also sets the power on / off of the display 4 and the volume of the speaker 19 according to the control signal. In this way, the terminal PC 3 can control the screen display function of the display 4 by transmitting a control signal based on DDC / CI.

  Next, a case where the screen display function is locked will be described. Locking the screen display function means a state in which the screen display function is not changed even if the user operates the operation unit 14, or a state in which the operation is ignored even if the operation unit 14 is operated (a state in which the operation of the operation unit 14 is not accepted). Say.

  When an administrator or the like connects a power outlet and the display 4 receives power supply from the power supply unit 16, the control unit 12 reads out lock information, which is information indicating whether or not to lock the screen display function, from the ROM 13. To be expanded in the internal RAM. In this lock information, contents indicating a locked state / unlocked state are written. When power is supplied for the first time, contents indicating an unlocked state are always written. The locked state is a state where an operation for changing the screen display function from the operation unit 14 is not accepted, and the unlocked state is a normal state where a change of the screen display function is accepted. When the user operates the operation unit 14, the control unit 12 reads the lock information expanded in the RAM. If the lock information is locked, the screen display function is maintained and no change is made. In the unlocked state, as described above, the display function setting information developed in the RAM is rewritten to change the screen display function.

  In the locked state, the above-mentioned OSD menu is displayed, but only the change of the screen display function such as the brightness may not be accepted, or the operation of the operation unit 14 is not accepted without displaying the OSD menu. You may do it. That is, the operation unit 14 is composed of operators (menu button, select button, enter button, UP / DOWN button, etc.) for changing the brightness and contrast. A specific operator may be unavailable (ignored even if the button is pressed).

  When power supply is first received from the power supply unit 16, lock information indicating an unlocked state is read from the ROM 13 and developed in the RAM. In other words, it is always unlocked after the power outlet is connected.

  As for the lock information, the terminal PC 3 transmits a control signal to switch the lock state / unlock state. The terminal PC 3 transmits a control signal for rewriting the lock information to the connected display 4. The control unit 12 receives a control signal for changing the lock information from the connected terminal PC 3 via the interface 10 and changes the lock information developed in the RAM to the locked state / unlocked state according to the control signal. As a result, the terminal PC3 can prohibit the change of the screen display function such as the brightness and contrast of the display 4, and can be unlocked only from the terminal PC3. Therefore, even if each user operates a button or the like on the display, the lock cannot be released and the setting can be prevented from being changed.

  The lock information may indicate the locked / unlocked state for all screen display functions, but may indicate the locked / unlocked state for each item individually. That is, the lock information indicates a state in which a change in luminance is prohibited, a state in which a change in contrast is prohibited, and the terminal PC3 may transmit a control signal for individually changing the lock state / unlock state.

  Note that when the display 4 is set to the locked state, the terminal PC 3 may be set to the locked state after setting the screen display function to the default state. That is, before transmitting the control signal for changing the lock information, the control signal is transmitted so that the default setting information stored in the ROM 13 is read to the control unit 12 and developed in the RAM.

  The above description shows the case where the administrator or the like operates the software built in the terminal PC3 to put the display 4 into the locked state. However, the management PC1 operates all the software built in the management PC1 so that all the terminal PC3 It is also possible to give an instruction to prohibit changing the display function of all the PC system displays at once by giving a control instruction.

  In FIG. 1, the management PC 1 can instruct each terminal PC 3 connected via the network to transmit a control signal for changing the lock information to the locked / unlocked state. That is, the management PC 1 can manage the locked / unlocked state of all the displays 4 via each terminal PC 3 and can prohibit the change of the screen display function at once. It is also possible to lock each display individually.

  In this way, the administrator or the like can operate the software in the management PC 1 to lock all the displays 4, so that each user can change the setting without having to lock many displays one by one. Can be prevented.

  The locked state continues until the terminal PC3 (or the management PC 1 via the terminal PC3) receives a control signal for changing to the unlocked state, but is automatically changed to the unlocked state by a timer. It may be. The ROM 13 stores the time for holding this state after changing to the locked state, and the control unit 12 receives power supply from the power supply unit 16 for the first time (when the power supply is connected to the power outlet). The retention time is also expanded in the RAM built in the control unit 12.

  When the control unit 12 receives a control signal indicating that the lock state is set from the terminal PC 3, the control unit 12 changes the lock information developed in the RAM to the lock state, and the lock information is unlocked when the hold time developed in the RAM elapses. Change to Whether or not to perform the unlocking operation by such a timer is stored as a flag (timer ON / OFF) in the control unit 12 built-in RAM, and the terminal PC 3 turns this flag on / off in the control unit 12. Send a control signal. The lock state holding time can be changed by the terminal PC 3 transmitting a holding time change control signal.

  The control unit 12 expands the message data (OSD menu or the like) stored in the ROM 13 in the RAM and outputs the message data to the image processing unit 11 to perform OSD display. When in the locked state, When the user performs an operation to change the screen display function from the operation unit 14, message data indicating a change prohibition state of the screen display function is displayed. That is, a message different from the message displayed in the unlocked state is displayed. For example, the reason for the lock, the time for holding the lock, the contact information of the administrator, the content indicating the unlocking method (the fact that it is necessary to perform a releasing operation from the PC to release the lock), and the like. These messages are stored in the ROM 13, but a plurality of types of message contents (text data) are stored in advance in the ROM 13, and the terminal PC 3 transmits a control signal for switching the display contents so as to be changed. It may be.

  Alternatively, the terminal PC 3 may transmit a control signal (text data rewrite control signal) for changing the message content so that the control unit 12 rewrites the text data developed in the RAM. In this way, the contents of the OSD display can be switched from the terminal PC3.

  The terminal PC 3 and the management PC 1 can also refer to the contents expanded in the RAM of the control unit 12. The terminal PC 3 transmits a control signal for enabling the contents developed in the RAM to be read to the control unit 12 via the interface 10. The control unit 12 outputs the contents of the RAM to the interface 10 accordingly. The terminal PC3 reads the contents of the RAM output to the interface 10. Thus, the terminal PC 3 can acquire the current setting of the display 4, and the management PC 1 can acquire the current setting of the display 4 from each terminal PC 3 and manage the setting in the system.

  Next, the operation of the display management system will be described in detail. FIG. 3 is a flowchart showing the operation of the display 4. This operation is started when power is supplied from the power supply unit 16 (when power supply is started by connecting a power outlet). First, the control unit 12 reads various setting information (default setting information) stored in the ROM 13 (s10). The various settings are screen display functions such as brightness and contrast, lock information, timer information, and message data. The various settings that have been read out are written into the RAM built in the control unit 12 (s11). The control unit 12 changes the settings of the image processing unit 11, the backlight 17 and the like according to the contents written in the RAM (s12).

  Thereafter, it is determined whether or not a control signal for changing the contents of the RAM is received from the terminal PC3 (s13). When a control signal for changing the contents of the RAM is received, each information is changed according to the control signal (s13 → s14), and the process of writing to the RAM is repeated (s14 → s11). The terminal PC 3 transmits a control signal for instructing change of the screen display function, a message data switching or rewriting control signal, a control signal for changing timer information, a control signal for changing the content of lock information, and the like. When a control signal for changing the content of the lock information is received, the lock information is changed to the locked / unlocked state and written to the RAM. Further, as described above, the lock state / unlock state may be changed at once for all screen display functions, but the lock state / unlock state may be changed individually for each item. Good. These control signals are transmitted by the terminal PC3 directly connected to the display 4. However, the management PC1 connected to the terminal PC3 over the network may instruct the terminal PC3 to transmit these control signals. Is possible.

  If a control signal for changing the contents of the RAM has not been received, it is determined whether or not operation information has been input from the operation unit 14 (s15), and operation information is input from the operation unit 14, that is, a screen display function from the user. If an operation to be changed is received, it is determined whether or not the operation item is in a locked state (s16). If it is not locked, the screen display function is changed (s16 → s17), and the process of writing to the RAM is repeated (s17 → s11). If it is in the locked state, the message data in the locked state is read and displayed in OSD (s16 → s18).

  Thereafter, it is determined whether or not the holding time has elapsed since the timer information developed in the RAM is read and changed to the locked state, that is, whether or not there is a timer interrupt (s19). If no operation information is input from the operation unit 14 in s14, a timer interruption determination process is performed (s15 → s19). If it is within the time to hold the timer information developed in the RAM, that is, the lock state, the process is repeated from the reception judgment of the change control signal (s19 → s13). If the time for holding the locked state has elapsed, the lock information is changed to the unlocked state in s14 (s19 → s14), and the process of writing to the RAM is repeated (s14 → s11).

  The contents written in the RAM are deleted when the power supply is disconnected and the power supply is cut off, and the above operation can be repeated from the beginning. That is, when the power outlet is removed, the locked state is forcibly released. On the other hand, even if the power is turned off (backlight extinction etc.) until the power outlet is removed, the contents of the RAM are retained and the locked state is also retained.

  In the display management system of the present embodiment, an example in which the terminal PC 3 transmits a control signal to lock the screen display function has been described. Of course, the operation unit 14 of the display 4 is used as in a conventional display. It is also possible to lock the screen display function.

  As described above, in the display management system according to the present embodiment, the terminal PC 3 connected to the display 4 can transmit a control signal and prohibit the change of screen display functions such as brightness and contrast. In addition, the change of the display function can be prohibited collectively from the management PC 1 that manages each terminal PC 3. Since the change of the screen display function is prohibited by the control signal transmitted from the management PC 1 and the terminal PC 3, the setting cannot be changed from the buttons for adjusting the brightness and contrast provided on the front surface of the display 4. There is no need to lock one by one, and the brightness and contrast settings of the display 4 used at the same time can be maintained, preventing each user from changing the settings.

  In the present embodiment, an example in which the terminal PC 3 transmits a control signal by command transmission and reception based on the DDC / CI standard using a video signal cable has been described, but the present invention is not limited to this. For example, the control signal may be transmitted using a USB or a dedicated interface. Of course, the display is not limited to the LCD, but may be another display such as a CRT or a projector.

Block diagram of display management system of the present invention Display block diagram Flow chart showing the operation of the display

Explanation of symbols

1-Management PC
2-LAN
3-terminal PC
4-display 10-interface 11-image processing unit 12-control unit 13-ROM
14-Operation unit 17-Backlight

Claims (11)

A display management system comprising a management device, a terminal device connected to the management device via a network, and a display device connected to the terminal device,
The management device includes control information transmission means for transmitting control information for controlling the terminal device,
Based on the control information received from the management device, the terminal device transmits lock information for prohibiting change of various settings to the connected display device and unlock information for releasing the prohibition of change. Comprising information transmission means,
The display device includes an operation unit that allows a user to change various settings;
Storage means for storing lock information or unlock information transmitted from the terminal device;
When unlocking information is stored in the storage unit when the operation unit is operated, various settings are changed according to the operation, and when lock information is stored, various settings according to the operation are performed. And a display control means that does not change the display management system. A display management system comprising a terminal device and a display device connected to the terminal device,
The terminal device includes lock information transmitting means for transmitting lock information for prohibiting change of various settings to a connected display device, and unlock information for canceling prohibition of change,
The display device includes an operation unit that allows a user to change various settings;
Storage means for storing lock information or unlock information transmitted from the terminal device;
When unlocking information is stored in the storage unit when the operation unit is operated, various settings are changed according to the operation, and when lock information is stored, various settings according to the operation are performed. And a display control means that does not change the display management system. The storage means stores a lock holding time indicating a time limit for holding storage of lock information prohibiting change of various settings,
The display control means changes the lock information to unlock information when the lock holding time stored in the storage means elapses after storing the lock information in the storage means. The display management system described in. The terminal device is provided with time change information transmitting means for transmitting holding time change information for changing the lock holding time stored in the storage means of the display device,
4. The display management system according to claim 3, wherein the display control means of the display device changes the lock holding time stored in the storage means based on the received holding time change information. The storage means further stores message data indicating a change prohibition state of various settings,
The display control means, when lock information is stored in the storage means when the operation means is operated, displays the message data stored in the storage means on the screen. The display management system according to claim 4. The terminal device is provided with message change information transmission means for transmitting message change information for changing message data stored in the storage means of the display device,
6. The display management system according to claim 5, wherein the display control means of the display device changes the message data stored in the storage means based on the received message change information. A display device connected to a terminal device to receive information,
Operation means for the user to change various settings;
Storage means for storing instruction information transmitted from the terminal device;
Display control means for changing various settings in accordance with the operation of the operation means;
With
In accordance with the instruction information received from the terminal device, the display control unit causes the storage unit to store lock information for prohibiting changes of various settings, or unlock information for canceling the change prohibition,
A display device, wherein when the operation unit is operated, the storage unit is read, and if the lock information is stored, various settings are not changed according to the operation. The storage means stores a lock holding time indicating a time limit for holding storage of lock information prohibiting change of various settings,
The display device according to claim 7, wherein the display control unit changes the lock information to unlock information when the lock holding time stored in the storage unit elapses after storing the lock information in the storage unit. . The display control means receives holding time change information for changing the lock holding time stored in the storage means of the display device from the terminal device,
The display device according to claim 8, wherein the lock holding time stored in the storage unit is changed based on the received holding time change information. The storage means further stores message data indicating a change prohibition state of various settings,
The display control means combines and displays the message data stored in the storage means on the screen if lock information is stored in the storage means when the operation means is operated. The display device according to claim 8 or 9. The display control means receives message change information for changing message data stored in the storage means of the display device from the terminal device,
The display device according to claim 10, wherein the message data stored in the storage unit is changed based on the received message change information.

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