JP2009168936A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display errors so that a user recognizes them when the size of a display region is designated in a part of a display part to display them in the display region in an image display device. <P>SOLUTION: The image display device CV includes a control part 50 for displaying a web page including contents received from a web server with a communication part 51 on the display part 52 and a storing part 54 for previously storing an error notification screen for notifying the user of it when not receiving the contents. The size of the display region is designated in a part of the display part 52, and layout information displaying the contents to the display region is included in the web page. The control part 50 obtains the error notification screen corresponding to the layout information by referring to the storing part 54 and displays it on the display region when the communication part 51 does not receive the contents displayed on the display region. Thus, the user recognizes the errors. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image display device suitable for displaying information related to control, monitoring, etc., for use in a housing equipment monitoring control system for controlling and monitoring housing equipment.

  2. Description of the Related Art Conventionally, there has been provided a housing equipment monitoring control system that controls and monitors housing equipment such as air conditioners, lighting fixtures, and various security devices. In such a housing equipment monitoring and control system, information related to housing equipment control and monitoring (for example, the operating state of an air conditioner or a lighting fixture) is displayed on a screen such as a liquid crystal screen, and the information is recognized by the user. An image display device is used to facilitate this. In recent years, with the widespread use of the Internet, image display apparatuses that perform data communication in the system using a protocol used on the Internet such as TCP / IP have begun to be provided.

  In addition, a controller that controls and monitors residential equipment is equipped with a web server function, and a plurality of contents prepared for each of a plurality of scenes related to control and monitoring can be provided to the image display device by the web server function. There has also been provided an image display device that allows a web page including the content to be displayed on a screen and browsed by a web browser function installed in the device (see, for example, Patent Document 1).

  A conventional image display device that uses such a web page includes a display unit, a communication unit that performs data communication with a home controller and a center device outside the home, and the controller and center device via the communication unit. And a control unit that displays the received content on the screen of the display unit by accessing the URL of the content created by the web server. The control unit performs control to simultaneously display a plurality of contents, for example, local content acquired from a home controller and center side content acquired from a center device outside the home on the same screen of the display unit.

A case where content cannot be displayed due to a network error or the like in such a conventional image display device will be described with reference to the drawings. In FIG. 22, an image display device 60 is connected to a center device 61 via the Internet. When the image display device 60 tries to display the full-screen content (web page) provided by the center device 61 on the screen 62 and the content cannot be received due to a network connection error due to network disconnection or the like, the image display device 60 Browsers display network connection errors across the screen. In FIG. 23, the screen 62 is divided into frames. When content in a frame cannot be received due to a network error, a network connection error is displayed in that frame. The network connection error display locally held by the browser of the image display device 60 is fixed to one. Therefore, even if the display area due to the frame becomes smaller due to frame division, the fixed network connection error set in the browser is displayed, so what is displayed because the network connection error character protrudes from the display area There was a situation that the user could not recognize. In addition, the same fixed network connection error is displayed when the connection with the controller in the house is not possible, so the user recognizes which controller has failed to connect and what screen has failed to display. There was a situation that was impossible.
Japanese Patent Application No. 2006-279301

  The present invention was made to solve such a problem, and when displaying the content in the display area by specifying the size of the display area as a part of the display unit, when the content cannot be displayed, An object of the present invention is to provide an image display device that can display an error so that a user can recognize it.

  In order to achieve the above object, the invention described in claim 1 includes a display unit that displays an image, a communication unit that performs data communication with a web server via a network to which one or more web servers are connected, and In order to notify the user when the content cannot be received in an image display device comprising: a control unit that causes the display unit to display a web page including the content received by the communication unit from the web server The web page includes layout information for displaying the content in the display area by specifying a size of the display area as a part of the display section. When the communication unit cannot receive content to be displayed in the display area, the control unit displays an error notification screen corresponding to the layout information. It was acquired by referring to the storage unit, in which to display the the error notification screen on the display area.

  According to a second aspect of the present invention, in the image display device according to the first aspect, the storage unit stores in advance a table in which location information of content to be displayed in the display area is associated with the error notification screen. When the content to be displayed in the display area cannot be received, the control unit acquires an error notification screen corresponding to the location information of the content with reference to the storage unit, and displays the error notification screen in the display region To do.

  According to a third aspect of the present invention, in the image display device according to the first aspect, the storage unit stores in advance a table in which the size of the display area is associated with the error notification screen, and the control unit When the content to be displayed in the display area cannot be received, an error notification screen corresponding to the size of the display area is acquired with reference to the storage unit, and the error notification screen is displayed in the display area. .

  According to a fourth aspect of the present invention, in the image display device according to the first aspect, when the control unit cannot receive the content to be displayed in the display area, the error notification screen can be displayed in the display area. In addition, the layout is adjusted and displayed.

  According to a fifth aspect of the present invention, in the image display device according to the third or fourth aspect, when the web page includes a plurality of display areas incapable of receiving content, the control unit includes the plurality of display areas. The error notification screen corresponding to the smallest display area is acquired with reference to the storage unit, and the error notification screen is displayed in the plurality of display areas.

  According to a sixth aspect of the present invention, in the image display device according to any one of the first to fifth aspects, at least one of the web servers performs at least one of monitoring or control of housing equipment. The controller has a function of providing content including contents related to the monitoring or control.

  According to a seventh aspect of the present invention, in the image display device according to the second aspect, the location information is a URL of content that the web server has.

  According to an eighth aspect of the present invention, in the image display device according to any one of the first to seventh aspects, the layout information includes an inline frame tag or a frame tag.

  According to the first aspect of the present invention, the error notification screen is displayed corresponding to the presence or absence of the layout information in which the size of the display area is specified as a part of the display unit. Therefore, only a part of the error notification screen is displayed. Is displayed in the display area, and an error can be notified so that the user can recognize it.

  According to the second aspect of the present invention, the error notification screen corresponding to the content location information is displayed, so that only a part of the error notification screen is prevented from being displayed in the display area so that the user can recognize it. An error can be notified, and an error corresponding to the location information of the content can be notified.

  According to the third aspect of the present invention, since the error notification screen corresponding to the size of the display area is dynamically displayed, even if there are a plurality of display areas having different sizes, one error notification screen is displayed. It is possible to notify an error so that only the copy can be prevented from being displayed in the display area and recognized by the user.

  According to the fourth aspect of the present invention, since the error notification screen is displayed with the layout adjusted to a size that can be displayed in the display area, an error notification screen with dynamically adjusted layout can be generated. It is possible to notify an error so that only the copy can be prevented from being displayed in the display area and recognized by the user.

  According to the fifth aspect of the present invention, the error notification screen corresponding to the minimum display area is displayed. Therefore, even when a plurality of display areas having different sizes exist on one screen, a part of the error notification screen is displayed. It is possible to notify the error so that the user can recognize it only by preventing it from being displayed in the display area.

  When an abnormality occurs when accessing and displaying a screen of a controller related to monitoring or control of housing equipment, the local screen from the user and the screen from the web server are just screens, and the user It is difficult to recognize which controller has an error in communication. According to the sixth aspect of the present invention, it is possible to display an error notification screen corresponding to the abnormality to the user at the time of abnormality.

  According to the seventh aspect of the present invention, the content received from the web server can be specified accurately.

  According to the eighth aspect of the present invention, it is possible to easily determine the presence or absence of the layout information that specifies the size of the display area as a part of the display unit based on the presence or absence of the inline frame tag or the frame tag.

  Hereinafter, an embodiment in which the technical idea of the present invention is applied to an image display device that also serves as a terminal device in a housing equipment monitoring and control system will be described with reference to the drawings.

  First, the housing equipment monitoring control system in which the image display apparatus according to the first embodiment of the present invention is used will be described. As shown in FIG. 3, the housing equipment monitoring and control system according to this embodiment includes a plurality of (three in the illustrated example) subsystems SS1 in which controllers C1, C2, and C3 installed in the house control and monitor the housing equipment. SS2, SS3, integrated management device TM connected to each controller Cn (n = 1, 2, 3), and a plurality (two in the illustrated example) connected to the integrated management device TM via a LAN cable Terminal devices (personal computer PC and image display device CV), and the plurality of controllers Cn, the integrated management device TM, and the terminal device constitute a home network using a general-purpose communication protocol such as TCP / IP. ing. Further, a home network is connected to the Internet from the integrated management device TM via an Internet connection device MD such as an ADSL modem, and a center device (center server) SV installed at a location away from the house is connected via the Internet. .

  The subsystem SS1 is a system that includes, for example, an equipment device Xm (m = 1, 2,...) Such as a lighting fixture, an air conditioner, and an electric lock, and an equipment device controller C1 that controls and monitors the equipment device Xm.

  The subsystem SS2 includes, for example, security devices Y1 and Y2 that detect the occurrence of an abnormality in a house, a security receiver SR that collects detection information of each security device Y1 and Y2, and detection information collected by the security receiver SR. The security system includes a security controller C2 that receives and transmits the received detection information through a home network using a response message.

  For example, the subsystem SS3 is a door phone DS with a camera installed outside a dwelling unit, and a sensor camera SC that detects a human intrusion into the monitoring area with a human sensor and images the monitoring area when the intrusion is detected. And interphone master unit IM having a function of displaying a picture taken by door phone slave unit DS and sensor camera SC, and a call function for making a call with door phone slave unit DS installed in a dwelling unit The image transfer system includes an image transfer controller C3 that receives an image captured by the door phone slave unit DS and the sensor camera SC and transmits the received image through a network.

  As described above, the controller Cn performs monitoring or control of the house facilities in the subsystem SSn to which each of the controllers Cn belongs, and transmits contents including contents related to the monitoring or control from a terminal device such as the image display device CV. Web server function provided via the home network in response to the request. The content provided by each controller Cn is described in a markup language such as HTML (HyperText Markup Language) or XML (Extensible Markup Language) that can be displayed by a browser, and can include character information, image files, and the like.

  Next, the image display device CV will be described with reference to FIG. An image display device CV (hereinafter referred to as a display device) is embedded in a wall surface of a house, and has a screen 52a such as a liquid crystal screen, a display unit 52 having a driver circuit thereof, and a web server function. A communication unit 51 that receives data including content from the web servers via a network connected to one or more web servers such as a controller Cn, and a CPU that displays a web page on the display unit 52. And a control unit 50. Furthermore, the display device CV includes a push button switch and a touch panel disposed on the screen 52a, an operation unit 53 that receives operation inputs, a storage unit 54 that stores programs executed by the CPU and various data, a speaker, and the like. And a speaker unit 55 having a speaker drive circuit. In addition, a power supply circuit (not shown) that converts commercial power into operating power and supplies power to the controller 50 and other components is also provided.

  Further, in the display device CV, for example, the above-described parts 50 to 55 are accommodated in a housing 56 made of a rectangular box-shaped synthetic resin or the like as shown in FIG. 2, and the display part 52 is disposed on the front surface of the housing 56. Yes. A hole for radiating the sound generated from the speaker unit 55 to the outside of the housing 56 is provided in the upper front portion of the housing 56. In addition, push button switches 53a, 53b, 53c, and 53d provided in the operation unit 53 are disposed on the lower front surface of the housing 56. In addition, although illustration is abbreviate | omitted, the insertion port of the modular jack which the communication part 51 has in the back surface of the housing 56, and the electric wire insertion hole of the terminal part to which the power wire from a commercial power source is connected are exposed.

  The control unit 50 of the display device CV is provided by each controller Cn and the like, and the content received by the communication unit 51 and the web page previously stored in the storage unit 54 are reproduced by a web browser, and the screen 52a of the display unit 52 is displayed. To display. In this web page, a link to the content provided by each controller Cn is displayed as an icon. If the touch panel of the screen 52a is operated on any icon, the URL of the link destination displayed by the icon In response to this, a content transmission request message is transmitted from the display device CV. When the controller Cn that has received the transmission request message transmits the requested content to the display device CV, a web page including the content of the controller Cn is displayed on the screen 52a.

  As shown in FIG. 4, a local-side content display area 521 for displaying content provided by each controller Cn and a center-side content display area 522 for displaying content provided from the center device SV may be provided on the screen 52a. Good. In the center-side content display area 522, for example, weather information provided from the center device SV is displayed as shown in FIG. In the display device CV, an icon or the like is displayed as content in each content display area, and the user can operate the touch panel on the icon. In addition, the user may operate with the push button switches 53a to 53d. In response to the user's operation, a content transmission request message is transmitted from the display device CV to the web server (center device SV or controller Cn), and the web server transmits the requested content to the display device CV. Is displayed in the display area. Also, the display device CV may access the automatically notified URL upon receiving a notification from the web server side.

  By including layout information for designating the size of the display area as a part of the screen 52a in the web page displayed on the screen 52a, the content is displayed in the display area designated by the size. For example, there are a frame and an inline frame as a technique for expressing a web page displayed by designating the size of the display area. A frame divides one screen into multiple display areas and displays different contents in each display area. An inline frame is a window with a size specified at a desired position in the screen. The display area is provided, and another content is displayed in the display area. An HTML frame tag (frame) is used for the frame, and an inline frame tag (iframe) is used for the inline frame.

  The screen of the personal computer PC is usually 10 inches or more, but the screen size of the display unit 52 of the display device CV is usually relatively small, for example, 3.5 inches. In the display on the screen 52a of the display device CV, if one screen is divided into a plurality of display areas, the divided display areas 521 and 522 are further reduced as shown in FIG. Accordingly, the content to be displayed in each display area is created with a size corresponding to such a small display area.

  The display device CV according to the present embodiment stores in advance an error notification screen for notifying the user when content cannot be received in the storage unit 54, and displays the size of the display area of the display unit 52. When the web page includes layout information for designating a part and displaying content in the display area, and the communication unit 51 cannot receive the content to be displayed in the display area, the control unit 50 corresponds to the layout information. An error notification screen is acquired with reference to the storage unit 54 and displayed in the display area.

  In FIG. 6, the display device CV displays a web page in which two display areas are provided on one screen, a center-side content display area 522 and a local-side content display area 521. When the web page is read by the browser, the control unit 50 of the display device CV designates the size of the display area as a part of the display unit 52 and determines whether or not there is layout information for displaying content in the display area. Do. Such layout information is, for example, an HTML inline frame tag or a frame tag.

  FIG. 7 shows an example of source code of a web page described in HTML. When the inline frame tag (iframe) is not included in the source code, the control unit 50 displays the full screen size as shown in FIG. Is displayed on the screen 52a of the display unit 52. As shown in FIG. 9, when the inline frame tag is included in the source code, as shown in FIG. 10, the control unit 50 acquires an error notification screen corresponding to the inline frame tag with reference to the storage unit 54, and It is displayed in the display area. In the error notification screen, the source code is described in HTML and includes characters for notifying an error. The error notification screen corresponding to the inline frame tag is created in advance with a fixed size according to the size of the inline frame.

  In the above-described conventional error notification screen (see FIG. 23), since the error notification screen of the full screen size is displayed in the inline frame, the error notification screen protrudes from the inline frame, and it is difficult for the user to recognize what is occurring. However, in the display device CV of the present embodiment, as shown in FIG. 11, an error notification screen corresponding to the size of the inline frame is displayed on the inline frame, so that the error can be effectively recognized by the user. Can be notified. The layout information is not limited to the inline frame tag, and the same applies to the frame tag (frame). In this case, the error notification screen corresponding to the frame tag is displayed in a frame that is created in advance with a fixed size according to the size of the frame.

  Next, a display device CV according to a second embodiment of the present invention will be described with reference to the drawings. The configuration of the display device CV of the present embodiment is the same as that of the first embodiment. In the present embodiment, as shown in FIG. 12, the storage unit 54 stores a table in which content location information (for example, URL) displayed in the display area is associated with an error notification screen. When the content to be displayed in the display area cannot be received, the control unit 50 acquires an error notification screen corresponding to the location information of the content with reference to the storage unit 54, and the error notification screen is displayed in the display region of the display unit 52. indicate.

  The content location information can be the domain name or IP address or host name of the web server, or the URL of the content that the web server has.

  As shown in FIG. 13, when the location information of the content specified by the inline frame tag is, for example, the URL (http: //www.192.168.0.36/top.html) of the content provided by the security controller C2, As illustrated in FIG. 14, the control unit 50 displays an error notification screen (mamorieerror.html) that displays that there is a connection abnormality of the security system SS2 in the display area specified by the inline frame tag. In this case, the numeric part of the content URL (http: //www.192.168.0.36/top.html) is the IP address (192.168.0.36). Similarly, when the location information of the content specified by the inline frame tag is, for example, the URL (http: //www.192.168.0.37/top.html) of the content provided by the image transfer controller C3, the control unit 50 Displays an error notification screen (rokutenerror.html) in the display area designated by the inline frame tag, indicating that there is a connection error of the image transfer system SS3.

  A table (see FIG. 12) in which content location information (URL) is associated with an error notification screen is created in advance and stored in the storage unit 54. As for the location information (URL) in the table, the device configuration including the IP address automatically generated by the integrated management device TM is received, and the control unit 50 creates a URL from the IP address and stores it in the storage unit 54. May be.

  Since the display device CV of the present embodiment displays an error notification screen corresponding to the location information of the content, an error is generated so that only a part of the error notification screen is prevented from being displayed in the display area and can be recognized by the user. Not only can it be notified, but also an error corresponding to the location information of the content can be notified. Therefore, it is possible to make the user recognize which controller Cn has failed to connect and what screen to attempt to display.

  Next, a display device CV according to a third embodiment of the present invention will be described with reference to the drawings. The configuration of the display device CV of the present embodiment is the same as that of the first embodiment. In the present embodiment, the storage unit 54 stores in advance a table in which the size of the display area is associated with the error notification screen. When the content to be displayed in the display area cannot be received, the control unit 50 acquires an error notification screen corresponding to the size of the display area with reference to the storage unit 54, and displays the error notification screen in the display area of the display unit 52. To display.

  As shown in FIG. 15, the storage unit stores in advance a table in which the size of the display area specified by the vertical size (height) and horizontal size (width) of the display area is associated with the error notification screen. As shown in FIG. 16, when the size of the display area specified by the inline frame tag (iframe) is, for example, a vertical size (height) 50 and a horizontal size (width) 80, as shown in FIG. The unit 50 acquires an error notification screen (err2.html) corresponding to the size with reference to the table stored in the storage unit 54, and displays it in the display area specified by the inline frame tag. Similarly, as shown in FIG. 18, when the size of the display area specified by the inline frame tag (iframe) is, for example, the vertical size 30 and the horizontal size 120, as shown in FIG. The error notification screen (err3.html) corresponding to the size is displayed in the display area specified by the inline frame tag. When the error notification screen is changed for each content location information, a table (see FIG. 15) in which the size of the display area is associated with the error notification screen is provided for each content location information.

  Since the display device CV of the present embodiment dynamically displays an error notification screen corresponding to the size of the display area, even when there are a plurality of display areas having different sizes, only a part of the error notification screen is displayed. Is displayed in the display area, and an error can be notified so that the user can recognize it.

  Next, a display device CV (not shown) according to a fourth embodiment of the present invention will be described. The configuration of the display device CV of the present embodiment is the same as that of the first embodiment. In the present embodiment, when the content to be displayed in the display area cannot be received, the control unit 50 displays the error notification screen with the layout adjusted to a size that can be displayed in the display area. For example, the control unit 50 automatically adjusts the font size or margin of the error notification screen and displays it in the display area. A web server is provided locally, and the control unit 50 passes information on the size specified by the inline frame tag to the web server as an argument, and the web server uses the argument passed before the screen display, the margin and font size, etc. May be calculated and an error notification screen dynamically adjusted in layout may be generated. As a method for generating the error notification screen, various methods such as CGI (Common Gateway Interface) and SSI (Server Side Include) can be used.

  In the third embodiment, the error notification screen stored in advance in association with the size of the display area in the table is displayed. However, the present embodiment dynamically adjusts the display area to a size that can be displayed in the display area. Since an error notification screen with a layout adjustment is generated, it is possible to prevent only a part of the error notification screen from being displayed in the display area without creating an error notification screen for each size of the correspondence table and the display area in advance. An error can be notified so that the user can recognize it. In addition, when changing the error notification screen for each content location information, it is not necessary to provide a table for associating the size of the display area with the error notification screen and the corresponding error notification screen for each content location information. An error notification screen for each information may be provided.

  Next, a display device CV according to a fifth embodiment of the present invention will be described with reference to the drawings. The configuration of the display device CV of the present embodiment is the same as that of the third or fourth embodiment. In the present embodiment, when the web page includes a plurality of display areas where content cannot be received, the control unit 50 refers to the storage unit 54 for an error notification screen corresponding to the smallest display area among the plurality of display areas. The error notification screen is acquired and displayed in each of a plurality of display areas. Since the size of each display area is described in the layout information of the web page, the control unit 50 determines the smallest of the described sizes. As shown in FIG. 20, there are two display areas specified by the inline frame tag (iframe). For example, the first display area 523 has a vertical size of 30 and a horizontal size of 80, and the second display area 524 has a vertical size. When the size is 50 and the horizontal size is 80, the first display area 523 is smaller than the second display area 524 and is the smallest. The storage unit stores in advance a table in which the size of the display area specified by the vertical size and horizontal size of the display area is associated with the error notification screen. When the error notification screen is displayed in the two display areas, the control unit acquires the error notification screen corresponding to the minimum size (vertical size 30 and horizontal size 80) with reference to the table stored in the storage unit. Are displayed in display areas 523 and 524 specified by the inline frame tag.

  Since the display device CV of the present embodiment displays an error notification screen corresponding to the minimum display area, only a part of the error notification screen is displayed even when a plurality of display areas having different sizes exist simultaneously on one screen. Is displayed in the display area, and an error can be notified so that the user can recognize it.

  The present invention is not limited to the configuration of each of the embodiments described above, and various modifications can be made without departing from the scope of the invention. For example, the network in which the display device of the present invention is used is not limited to a network that monitors or controls housing equipment in a single house, and may be, for example, a network that monitors or controls housing equipment in an apartment house, It may be a network that monitors or controls equipment such as offices and stores.

1 is a configuration diagram of an image display device according to a first embodiment of the present invention. The front view of the apparatus. The block diagram of the housing equipment monitoring control system in which the apparatus is used. Explanatory drawing of the display area on the screen of the apparatus. Explanatory drawing of the example of a display in the display area on the screen of the apparatus. The front view in the display state of the same apparatus. Source code that does not include inline tags for web pages displayed by the device. Error notification screen of full screen size on the same web page. Source code that includes inline tags for web pages displayed by the device. Error notification screen for inline frames on the same web page. The front view which displayed the error notification screen corresponding to an inline frame on the same apparatus. The table which matched the location information of the content displayed on the display area in the same apparatus, and an error notification screen. The source code of the web page of the image display apparatus which concerns on the 2nd Embodiment of this invention. Explanatory drawing which displayed the error notification screen in the web page. The table which matched the magnitude | size of the display area and error notification screen in the image display apparatus which concerns on the 3rd Embodiment of this invention. Source code of the device web page. Explanatory drawing which is displaying the error notification screen of the web page on the screen of the apparatus. Another source code of the device web page. Explanatory drawing which is displaying the error notification screen of the web page on the screen of the apparatus. The front view which is displaying the content on the image display apparatus which concerns on the 5th Embodiment of this invention. The front view which is displaying the error notification screen on the same apparatus. Explanatory drawing of the condition where a network connection error is displayed on the whole screen of the conventional image display apparatus. Explanatory drawing of the condition where a network connection error is displayed on the one part display area of the screen of the conventional image display apparatus.

Explanation of symbols

CV image display device 50 control unit 51 communication unit 52 display unit 54 storage unit

Claims (8)

A display for displaying an image;
A communication unit that performs data communication with a web server via a network to which one or more web servers are connected;
A control unit that causes the display unit to display a web page including content received by the communication unit from the web server;
A storage unit for preliminarily storing an error notification screen for notifying the user when the content cannot be received;
Layout information for displaying the content in the display area by specifying the size of the display area as a part of the display section is included in the web page, and the communication section receives the content displayed in the display area. If not, the control unit acquires an error notification screen corresponding to the layout information with reference to the storage unit, and displays the error notification screen in the display area. The storage unit stores in advance a table in which location information of content to be displayed in the display area is associated with the error notification screen,
When the content to be displayed in the display area cannot be received, the control unit acquires an error notification screen corresponding to the location information of the content with reference to the storage unit, and displays the error notification screen in the display region The image display apparatus according to claim 1. The storage unit stores in advance a table in which the size of the display area is associated with the error notification screen,
When the content to be displayed in the display area cannot be received, the control unit acquires an error notification screen corresponding to the size of the display area with reference to the storage unit, and displays the error notification screen in the display area The image display device according to claim 1.   The image according to claim 1, wherein when the content to be displayed in the display area cannot be received, the control unit displays the error notification screen with a layout adjusted to a size that can be displayed in the display area. Display device.   When the web page includes a plurality of display areas incapable of receiving content, the control unit acquires the error notification screen corresponding to the smallest display area among the plurality of display areas with reference to the storage unit, The image display device according to claim 3 or 4, wherein the error notification screen is displayed in the plurality of display areas.   2. The controller according to claim 1, wherein at least one of the web servers is a controller that performs at least one of monitoring or control of a housing facility and providing a content including contents related to the monitoring or control. The image display device according to claim 5.   The image display apparatus according to claim 2, wherein the location information is a URL of content included in the web server.   The image display apparatus according to claim 1, wherein the layout information includes an inline frame tag or a frame tag.

Images