JP4988265B2 - Information display system - Google Patents

Description

  The present invention relates to an information display system using a television door phone.

  As a TV door phone, a camera-equipped door phone slave unit and a door phone master unit are communicably connected via a cable. The door phone master unit includes a display device such as a liquid crystal display, and displays an image captured by the camera of the door phone slave device on the display device.

  In the television door phone disclosed in Patent Document 1, the door phone master is connected to the management server through a network. The management server transmits information regarding the maintenance of the equipment installed in the house to the doorphone master unit, and the doorphone master unit displays the received information.

  Moreover, in the television door phone disclosed in Patent Document 2, the door phone parent device is connected to the image server through a network. The intercom master unit transfers an image captured by the intercom slave unit to the image server, and the image server stores the image.

In this way, by connecting the TV door phone to the network and enabling communication with an external terminal such as a server, a function of information display that obtains and displays various information in addition to the customer service that is a basic function Will be provided. As a result, an information display system using the TV door phone can be formed, and the added value of the TV door phone can be increased.
JP 2004-135203 A JP 2004-135202 A

  The door phone master unit displays external information obtained from the external terminal and image information from the door phone slave unit. The acquired external information is temporarily stored, but information that the user confirms and determines that it is unnecessary is deleted. On the other hand, information determined to be important is stored as it is.

  However, the doorphone master unit does not output external information or image information to the outside. If external information can be displayed using an external terminal carried by the user, the user can view the external information even when outdoors, and the information is more useful to the user. Further, if the user can see the image information, the customer who is away can be confirmed. In this way, it is desired that the same information as that of the door phone master unit can be displayed on the external terminal. At this time, if the setting of the camera of the door phone slave unit is inappropriate, even if the image of the camera is displayed, the image becomes difficult to see and information useful for the user cannot be obtained. If the camera can be controlled, this problem can be solved. Therefore, it is also desired that the door phone slave unit can be controlled from an external terminal.

  Therefore, in view of the above, an object of the present invention is to provide an information display system capable of obtaining useful information by a user by actively utilizing an external terminal.

  The present invention includes a door phone with a camera, a display terminal that is communicably connected to the door phone, and an external terminal that is communicably connected to the display terminal through a network. The display terminal acquires external information from the external terminal. Information acquisition means, display means for displaying external information and image information captured by the door phone, and output means for outputting external information or image information to the outside.

  The external terminal provides external information to the display terminal. Therefore, the information acquisition unit of the display terminal acquires the information by receiving the external information transmitted from the external terminal. Alternatively, external information is obtained by accessing an external terminal. When the display means displays the external information, the user can use the external information.

  The output means transmits external information or image information to the external terminal and outputs the data in the form of data. Alternatively, external information or image information is transmitted to an image processing apparatus or printer as an external terminal, and printed on a sheet to be output in the form of an image. This output is executed by the request of the external terminal or by the operation of the display terminal by the user's operation.

  Thus, by outputting information in various forms to the outside, the user can obtain the information in a form that is easy to use. In particular, when the user is out, if there is a visitor, the image information captured by the camera can be confirmed on the external terminal.

  The display terminal has control means for controlling the door phone, and controls the door phone according to a command from the external terminal. When the user is out, the doorphone can be turned on and off by the external terminal, and the doorphone can be turned off when not needed.

  The control means outputs the set state of the door phone to the outside through the output means in response to a request from the external terminal. The setting state is, for example, an imaging condition or image processing condition of the camera. By confirming the setting state through the external terminal, the setting state can be changed as necessary. That is, the external terminal outputs a command for changing the setting state to the display terminal. The display terminal controls to change the setting state of the door phone in accordance with this command. Therefore, even if it is difficult to see the image captured by the camera, it can be corrected to an easy-to-view image.

  The display terminal has recording means for recording external information, the display means displays external information read from the recording means, and the output means outputs external information read from the recording means. Thereby, the display terminal can acquire a lot of external information. The user can easily obtain useful information by selecting only necessary information. Further, unnecessary information or information that is no longer needed may be deleted from the recording means.

  When image information or external information is input to the display terminal, the display means preferentially displays the information currently displayed. To display newly input information, the display may be switched.

  When image information or external information is input to the display terminal, the display means displays the input information together with the currently displayed information. Thereby, a plurality of information can be displayed on one screen, and the user can always see new information. When urgent information is entered, it can be confirmed immediately.

  According to the present invention, not only image information captured by a camera but also various types of external information can be acquired from an external terminal on a display terminal, and a user can select useful information and output it in a form that is easy to use. Thus, the user can easily obtain useful information by utilizing the external terminal. Therefore, by forming an information display system using a TV door phone, the TV door phone can be multi-functional and its added value can be increased.

  An information display system using the television door phone of this embodiment is shown in FIG. This system includes a door phone with camera 1 that is a door phone with camera, a door phone base 2 that is a display terminal, and an external terminal 3. A door intercom 1 with a camera and a door intercom 2 with a display device constitute a TV door phone. The intercom base unit 2 and the external terminal 3 are communicably connected via a network.

  The doorphone slave unit 1 and the doorphone master unit 2 are general ones, and are connected via a two-wire cable 4. The door phone 1 includes an imaging unit 10, an imaging circuit 11, and a video processing circuit 12 as a camera, and a speaker 13, a speaker circuit 14, a microphone 15, a microphone circuit 16, an FM modulation circuit 17, an impedance conversion circuit 18, and a control circuit. 19. A control signal input / output circuit 20 is provided.

  The intercom base unit 2 includes a display unit 21, a display circuit 22, and a video processing circuit 23 as a display device, and a speaker 24, a speaker circuit 25, a microphone 26, a microphone circuit 27, an FM demodulation circuit 28, an impedance conversion circuit 29, and a control. A circuit 30, a control signal input / output circuit 31, a recording unit 32, and an operation unit 33 are provided. The operation unit 33 includes a call button 34, an F1 button 35, an F2 button 36, an F3 button 37, a page up button 38, a page down button 39, and an information / image display switching button 40.

  The intercom base unit 2 includes a network input / output circuit 41 as a communication circuit for communicating with the external terminal 3. A communication line such as a LAN cable is connected to the network input / output circuit 41, and the network input / output circuit 41 communicates with the external terminal 3 via a network such as the Internet, LAN, or WAN.

  The external terminal 3 connected to the network may be an information processing terminal having a communication function and a display unit, and examples thereof include a mobile phone, an information mobile terminal, a personal computer, and a server.

  The above-described TV doorphone allows the visitor and the user to talk on the phone indoors and outdoors while confirming the visitor's image. That is, an image captured by the imaging unit 10 such as a CCD camera of the door phone slave unit 1 is converted by the imaging circuit 11 into an electrical signal corresponding to the subject. The video processing circuit 12 performs correction processing such as white balance, AGC (auto gain control) level, luminance, and contrast, and converts the signal into an NTSC signal to generate a video signal. The set value in this correction process is generally set to an initial value that provides the most preferable image when displayed. The set value is stored in a rewritable nonvolatile memory.

  The video signal output from the video processing circuit 12 is FM modulated by the FM modulation circuit 17 to be an FM video signal. The FM video signal is transmitted from the impedance conversion circuit 18 to the door phone base unit 2 through the two-wire cable 4.

  The voice input from the microphone 15 of the door phone slave unit 1 is converted into a voice signal by the microphone circuit 16 and transmitted from the impedance conversion circuit 18 to the door phone master unit 2. In addition, the audio signal transmitted from the door phone base unit 2 is amplified by the speaker circuit 14 and the audio is output from the speaker 13.

  In the door phone master unit 2, the FM video signal transmitted from the door phone slave unit 1 is demodulated into the original video signal by the FM demodulation circuit 28. The demodulated video signal is basically the same as the video signal generated by the video processing circuit 12 of the door phone slave unit 1. The video signal is converted into an RGB signal by the video processing circuit 23. Based on the RGB signals, the display circuit 22 outputs a drive signal having a signal output timing and a signal voltage level to the display unit 21, and image information is displayed on the display unit 21.

  In the communication between the doorphone master unit 2 and the doorphone slave unit 1, an audio signal and a video signal are transmitted from the doorphone slave unit 1 to the doorphone master unit 2 through the two-wire cable 4, and the voice is transmitted from the doorphone master unit 2 to the doorphone slave unit 1. Send a signal. Further, the control signal is transmitted bidirectionally. The control signal is, for example, a signal for controlling the door phone slave unit 1, a signal for changing the setting value of the camera, or a signal for confirming the setting value of the camera. Further, in order to supply power to the doorphone slave unit 1, a DC current is supplied from the doorphone master unit 2 to the doorphone slave unit 1 while being superimposed on the above signal. Therefore, full duplex communication is performed in which a plurality of signals are multiplexed and transmitted.

  In this multiplexed transmission method, a part of the frequency band occupied by the bidirectional audio signal overlaps with the frequency band occupied by the video signal. Therefore, in order to avoid overlapping of frequency bands, one of the signals is modulated. Here, it is assumed that the video signal is an FM modulation signal (band is 5M to 13 MHz) with a carrier frequency of 9 MHz, and the audio signal is a 100 to 4 kHz baseband signal as it is. The frequency band of the video signal does not overlap the frequency band of the audio signal, and each signal can be multiplexed and transmitted.

  Further, the control signal is transmitted, for example, as a 40 kHz burst wave so as not to affect both the video signal and the audio signal. The control signal may be transmitted in one direction from the doorphone master unit 2 to the doorphone slave unit 1 if it is not necessary to check the set value.

  The control signal input / output circuit 20 of the door phone slave unit 1 detects the 40 kHz burst wave and inputs a logic signal for changing the set value to the control circuit 19, for example. Further, the 40 kHz burst wave is modulated with a logic signal indicating the current set value from the control circuit 19, and a control signal for confirming the set value is output. The control signal input / output circuit 31 of the door phone base unit 2 also has the same function.

  An FM modulation circuit 17, a microphone circuit 16, a speaker circuit 14, and a control signal input / output circuit 20 are connected to the impedance conversion circuit 18 of the door phone slave unit 1. The impedance conversion circuit 18 makes the two-wire cable 4 high impedance in order to multiplex and transmit FM video signals, audio signals, and control signals. The impedance conversion circuit 18 transmits and receives the FM video signal, the audio signal, and the control signal superimposed via the two-wire cable 4. The impedance conversion circuit 29 of the door phone base unit 2 also has the same function.

  Further, the door phone master unit 2 supplies power to the door phone slave unit 1 via the two-wire cable 4. Since the power source is generally low impedance, it is possible to supply power to the doorphone slave unit 1 while the two-wire cable 4 is kept in a high impedance state by both impedance conversion circuits 18 and 29.

  The control circuits 19 and 30 of the door phone master unit 2 and the door phone slave unit 1 have a CPU, a ROM, and a RAM. The control circuit 30 of the door phone master unit 2 controls the display device and the door phone slave unit 1 in accordance with an input signal from the operation unit 33. The control circuit 30 transmits a control signal to the door phone slave unit 1 via the two-wire cable 4. The control circuit 19 of the door phone slave unit 1 controls the camera in accordance with a control signal from the door phone master unit 2. The control circuits 19 and 30 also control mutual communication.

  Then, the control circuit 30 of the door phone base unit 2 controls the network input / output circuit 41 to communicate with the external terminal 3 through the network. The network input / output circuit 41 includes a communication interface, and transmits / receives data to / from the external terminal 3 via the network using a predetermined communication protocol such as TCP / IP.

  Here, if the network input / output circuit 41 and communication software are installed in the doorphone master unit 2 that originally does not have a communication function, it can be easily a display terminal. Therefore, an information display system can be easily constructed by using an existing television door phone.

  The external terminal 3 provides external information such as advertisement information and area information to the intercom base unit 2. That is, the external terminal 3 transmits the external information with the intercom base unit 2 as a destination. The control circuit 30 of the intercom base unit 2 acquires external information through the control signal input / output circuit 31 and records the external information in the recording unit 32. The recording unit 32 is a readable / writable memory such as a nonvolatile memory, a hard disk, or an optical disk.

  Then, the control circuit 30 reads external information from the recording unit 32 and causes the display unit 21 to display it. The display unit 21 also displays image information transmitted from the doorphone slave unit 1. The control circuit 30 switches between external information and image information in accordance with an input signal from the operation unit 33, and displays either one of the information.

  Further, the control circuit 30 outputs external information or image information to the external terminal 3 in response to a request from the external terminal 3. That is, when there is an information output request from the external terminal 3, the control circuit 30 reads the external information from the recording unit 32, drives the network input / output circuit 41, and transmits the external information to the external terminal 3. In the case of image information, the image information from the doorphone slave unit 1 is temporarily stored in the RAM, and the network input / output circuit 41 is similarly driven to transmit the image information to the external terminal 3. The transmission destination of each information is the external terminal 3 that has requested transmission, or another external terminal 3 designated by the requested external terminal 3.

  Further, the control circuit 30 controls the door phone slave unit 1 according to a command from the external terminal 3. When the external terminal 3 transmits the command information, the control circuit 30 generates a control signal according to the command information and transmits the control signal to the door phone slave unit 1. The intercom slave device 1 operates based on a control signal corresponding to a command from the external terminal 3. The external terminal 3 can perform control such as turning on / off the doorphone slave unit 1, changing a set value, and confirming the set value.

  The doorphone master unit 2 and the doorphone slave unit 1 are operated by a user operation. As shown in FIG. 2, the door phone parent machine 2 is provided with an operation unit 33. The call button 34 is operated to start a call after receiving a call from the doorphone slave unit 1. When the call button 34 is pressed, a call can be made between the doorphone slave unit 1 and the doorphone master unit 2.

  The F1 button 35, the F2 button 36, and the F3 button 37 are function buttons having functions unique to each application. First, in the display mode, it functions as a selection button, and is operated to sequentially display external information classified and recorded in the recording unit 32 in the doorphone master unit 2. Although there are three function buttons, there may be a plurality of function buttons. Alternatively, one function button may be used to select external information depending on the number of operations.

  In the setting mode, the function button functions as a setting button. It is used to confirm or change the setting state of white balance, AGC level, brightness, contrast, etc. for the camera of the door phone slave unit 1.

  The user operates the F1 button 35, the F2 button 36, and the F3 button 37 while confirming the image on the display unit 21. As a result, it is possible to reset (re-adjust) the set value so that the image is most easily viewable.

  Generally, the initial setting state at the time of factory shipment of the device is a preferable setting state under general use conditions. However, depending on the installation situation of the door phone 1, the surroundings may be too dark, too bright, or backlit. In the initial setting state, clear image information is not displayed. Therefore, clear image information can be displayed if the setting state can be changed in accordance with individual installation conditions. When the setting value of the camera is changed by operating the above function button, a clear image can be obtained. The control circuit 30 of the intercom base unit 2 transmits a control signal related to the changed set value to the intercom base unit 1. The control circuit 19 of the door phone slave unit 1 rewrites the set value based on the logic signal extracted from the control signal.

  The page up button 38 and the page down button 39 have different functions depending on the displayed information. When external information is displayed, the page of external information is switched. When the external information is composed of a plurality of pages, the external information is switched page by page by operating one of the buttons 38 and 39, and each page is displayed.

  When image information is displayed, settings such as white balance, AGC level, brightness, and contrast can be adjusted. The page up button 38 and the page down button 39 are operated to finely adjust the setting value to the + side or the − side. For example, when the page up button 38 is operated while the contrast (brightness) is being controlled, the image becomes one rank brighter than the present, and when the page down button 39 is operated, the image becomes one rank darker than the present.

  The information / image display switching button 40 switches the display on the display unit 21 to either external information or image information. The TV door phone is normally in a standby state, and the display unit 21 is off. When external information is received from the external terminal 3, the control circuit 30 records the external information in the recording unit 32 and displays it on the display unit 21. In the standby state, when there is a call from the doorphone slave unit 1, the control circuit 30 displays a captured image.

  When a call is made from the doorphone slave unit 1 while external information is being displayed, a ringing tone is emitted from the speaker 24. External information remains displayed on the display unit 21. When the information / image display switching button 40 is operated, the display is switched from the external information to the image information. On the contrary, if an external information is received from the external terminal 3 while the image information is being displayed, a ring tone is sounded from the speaker 24. The display remains in the image information display and does not switch. When the information / image display switching button 40 is operated, the display is switched from the image information to the external information. That is, when the user hears a ring tone or a ring tone while viewing the display on the display unit 21, the user determines whether to switch the display and operates the information / image display switching button 40.

  When the information / image display switching button 40 is operated while the display unit 21 is off in the standby state, external information is displayed. The external information displayed at this time is not the latest external information. First, a list of external information recorded in the recording unit 32 is displayed. By operating each function button, target external information is selected from the list display, and the external information is displayed on the display unit 21. Thereafter, when the information / image display switching button 40 is operated, the display is switched to image information display.

  Further, when the call button 34 is operated while the display unit 21 is turned off in the standby state, the camera of the door phone slave unit 1 is activated and image information at this time is displayed. Thereafter, when the information / image display switching button 40 is operated, the display is switched to display of external information.

  And while displaying each information, when a fixed time, for example, 3 minutes pass, the display part 21 will be turned off and it will return to a standby state. Alternatively, when the call button 34 is operated, the display unit 21 is turned off and similarly returns to the standby state. Thus, the call button 34 also functions as a button for turning the display unit 21 on and off.

  As described above, the control circuit 30 of the door phone master unit 2 controls the door phone slave unit 1 to execute the original function of the TV door phone, and also executes a function as a display terminal that inputs and outputs information through the network. That is, the control circuit 30 acquires and displays external information from the external terminal 3, a function of outputting the external information and image information captured by the door phone slave unit 1 to the external terminal 3, and a command from the external terminal 3. The door phone slave unit 1 is controlled based on

  The operation for displaying and outputting information by the doorphone master unit 2 will be described with reference to FIG. When external information is recorded in the recording unit 32 of the intercom base unit 2, the external terminal 3 requests the intercom base unit 2 to output the external information. The control circuit 30 of the intercom base unit 2 reads the external information from the recording unit 32 and transmits the external information to the designated external terminal 3 of the transmission destination. When there is no designation of the transmission destination, it transmits to the requesting external terminal 3.

  When a plurality of pieces of external information are recorded in the recording unit 32, the external terminal 3 may acquire external information list information from the doorphone master unit 2 and specify desired external information. The control circuit 30 transmits the designated external information to the external terminal 3.

  Further, when there is a request for output of image information from the external terminal 3, the control circuit 30 similarly transmits image information captured by the camera of the door phone slave unit 1 to the external terminal 3.

  Instead of transmitting in response to a request from the external terminal 3, the user can operate the operation unit 33 to transmit external information to the external terminal 3. The user designates the external information to be transmitted and the external terminal 3 as the transmission destination. The control circuit 30 reads the designated external information from the recording unit 32 and transmits it to the designated external terminal 3. Furthermore, not only one external terminal 3, but the control circuit 30 may transmit the same external information or image information to a plurality of external terminals 3 by multicast.

  The control circuit 30 does not accept a request from the external terminal 3 when communication is being performed such that the intercom base unit 2 outputs information to the external terminal 3 or receives external information from the external terminal 3. When this communication is completed, the control circuit 30 can accept the request.

  When the user operates the operation unit 33 so that external information is displayed when the intercom base unit 2 is in a standby state, the control circuit 30 reads the external information from the recording unit 32 and causes the display unit 21 to display it. When the call button of the doorphone slave unit 1 is operated by a visitor during this display, a ringing tone sounds from the speaker 24 of the doorphone master unit 2 by a call from the doorphone slave unit 1. The camera of the door phone slave unit 1 is activated to image a visitor. However, the control circuit 30 keeps the external information displayed and does not change the display.

  When the user operates the information / image display switching button 40, the control circuit 30 switches the display from external information to image information. The image information of the visitor imaged by the camera is displayed.

  When there is a visitor and image information is displayed and the external terminal 3 transmits the external information, the control circuit 30 of the door phone base unit 2 detects an incoming call from the external terminal 3 and receives a ring tone from the speaker 24. Sounds. The control circuit 30 keeps displaying the image information and does not change the display. The control circuit 30 records the received external information in the recording unit 32. At this time, when the user operates the information / image display switching button 40, the control circuit 30 switches the display from the image information to the external information. External information is displayed on the display unit 21. However, the external information to be displayed is external information recorded in the recording unit 32 and is external information selected from the list by the user.

  Here, to display the latest external information that has been sent, once the existing external information is displayed, operate the function button to select the latest external information from multiple external information. do it.

  No operation is performed after either external information or image information is displayed, and the control circuit 30 automatically turns off the display unit 21 when a certain time (3 minutes) has elapsed. If the user operates the call button 34 before the predetermined time has elapsed, the control circuit 30 forcibly turns off the display unit 21. When the display unit 21 is turned off, the intercom base unit 2 enters a standby state.

  When the user operates the call button 34 while the intercom base unit 2 is in a standby state, the control circuit 30 transmits a control signal to the intercom sub unit 1 to activate the camera, and displays image information captured by the camera. .

  When there is a call from the doorphone slave unit 1 in the standby state, the control circuit 30 of the doorphone master unit 2 sounds a ringing tone and turns on the display unit 21 to display image information captured by the camera. . At this time, the control circuit 30 of the doorphone master unit 2 transmits the image information to the external terminal 3 designated in advance. As a result, when the user is absent and there is a visitor, the visitor's image is transmitted to the external terminal 3 carried by the user. The user can confirm the visitor.

  When there is an incoming call from the external terminal 3 in the standby state, the control circuit 30 of the doorphone master unit 2 sounds a ringtone and turns on the display unit 21 to display the external information read from the recording unit 32. Let Even in this case, as described above, by transmitting the external information to the designated external terminal 3, the user can check the external information even when the user is out. Particularly urgent information is very useful for the user.

  Next, when controlling the door phone slave unit 1 based on a command from the external terminal 3, the external terminal 3 transmits command information to the door phone master unit 2. When the door phone base unit 2 receives the command information, the control circuit 30 analyzes the content of the command information and generates a control signal for controlling the door phone slave unit 1 according to the content. The control circuit 30 transmits a control signal to the door phone slave unit 1. In the intercom 1, when the control signal is received, the control circuit 19 controls the camera based on the control signal.

  If the command information indicates that the doorphone slave unit 1 is powered on, the control circuit 19 of the doorphone slave unit 1 activates the camera and transmits the captured image information to the doorphone master unit 2. The intercom base unit 2 displays image information. Alternatively, the image information is transmitted to the external terminal 3.

  If the command information indicates that the power of the door phone slave unit 1 is off, the control circuit 19 of the door phone slave unit 1 turns off the power. The control circuit 19 transmits information that the doorphone slave unit 1 is powered off to the doorphone master unit 2. The intercom base unit 2 enters a standby state and transmits this information to the external terminal 3. In response to this, the external terminal 3 notifies that the door phone slave unit 1 has been turned off. It should be noted that the doorphone master unit 2 is always powered on so that it can handle communications from visitors and external terminals 3.

  In this way, the door phone slave unit 1 can be controlled on and off by the external terminal 3. When it is not necessary to operate the door phone slave unit 1, the door phone slave unit 1 can be stopped and power saving can be achieved. The door phone slave unit 1 is provided with a human body sensor such as an infrared sensor, and the door phone slave unit 1 is activated when a person is detected. Then, the camera operates and images a person. The intercom base unit 2 transmits this image information to the external terminal 3. Therefore, even when the user is out, the user can see the image information through the external terminal 3 and can confirm the visitor.

  When the command information is a camera setting, the external terminal 3 transmits the set value as command information to the intercom base unit 2. The control circuit 30 of the doorphone master unit 2 generates a control signal based on the command information and transmits the control signal to the doorphone slave unit 1. The control circuit 19 of the door phone 1 extracts the setting value from the control signal and rewrites the setting value stored in the memory with the changed setting value. Then, the external terminal 3 transmits command information for confirming the set value. According to the command information received through the doorphone master unit 2, the doorphone slave unit 1 transmits setting information regarding the setting value to the doorphone master unit 2, and the setting information is transmitted from the doorphone master unit 2 to the external terminal 3. As described above, if the setting value of the camera can be changed from the external terminal 3, it is possible to easily make an image easy to see when confirming the transmitted image information.

  In addition, this invention is not limited to the said embodiment, Of course, many corrections and changes can be added to the said embodiment within the scope of the present invention. In the above-described embodiment, when displaying the external information and the image information, the doorphone master unit gives priority to one information currently being displayed. By switching operation, the information is switched to the other information and displayed. That is, only one of the information is displayed. Therefore, the doorphone master unit may display external information and image information at the same time. That is, one screen is divided into two and each information is displayed. Alternatively, the other information is superimposed on one of the currently displayed information.

  The door phone master unit may access an external terminal when acquiring external information. The intercom base unit selects one or a plurality of external information from a plurality of external information held by the external terminal, and the external terminal transmits the selected external information to the intercom base unit. Thereby, the user can acquire necessary information.

  The display terminal may include a computer device such as a personal computer, a server, or a gateway that includes a display unit and has a function of performing communication through a network. By adding a function as a TV door phone to this computer device, communication can be performed with the door phone slave unit.

  When external information or image information is output, it is output in the form of data to an external terminal, but it may be output in the form of data such as being sent in the body of an e-mail or attached to an e-mail. Good. Alternatively, it may be output in the form of an image such as printing on a sheet. In this case, the external terminal is a printer or an image processing apparatus. The user can obtain information in various forms and can use the information.

  The door phone master unit and the door phone slave unit are connected by a two-wire cable, but both may be connected by a LAN cable. By adding a router function to the door phone master unit, the door phone slave unit can communicate with an external terminal through a network. Further, the doorphone master unit and the doorphone slave unit may be capable of wireless communication using a wireless LAN or the like.

Overall configuration diagram of the information display system of this embodiment External view of door phone master unit Operation flowchart for information display and output by door phone master unit

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Door phone cordless handset 2 Door phone master 3 External terminal 10 Imaging part 19 Control circuit 21 Display part 30 Control circuit 32 Recording part 33 Operation part 41 Network input / output circuit

Claims (3)

A door phone with a camera, a door terminal connected to the door phone via a two-wire cable, a communication terminal that communicates with the door phone by multiplexing and transmitting audio signals, video signals, and control signals, and a communication terminal connected to the display terminal through a network. The external terminal, and the display terminal outputs external information or image information to the outside, information acquisition means for acquiring external information from the external terminal, display means for displaying the external information and image information captured by the door phone, and the like. It has an output means and a control means for controlling each means and communicating with an external terminal to control a door phone . When the display means displays external information or image information, other information is input. An information display system characterized by displaying information that is currently displayed even if it is displayed. Control means outputs a setting state of the intercom through the output unit at the request of the external terminal to an external terminal, have row power-off and setting at the intercom by a command of the external terminal, a command external terminal changes the setting state 2. The information display system according to claim 1 , wherein when outputting to the display terminal, the control means controls the display terminal to change the setting state of the camera, and the image information is corrected . An existing doorphone base unit connected to a doorphone, wherein the communication terminal is installed in a doorphone base unit that is not equipped with a communication circuit for connecting to a network, thereby forming a display terminal. Item 3. The information display system according to Item 1 or 2.

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