JP6128838B2 - Information processing apparatus, control method thereof, and program - Google Patents

Description

  The present invention relates to an information processing apparatus that can communicate with a display control apparatus.

  Normally, an image signal is transmitted and received between the PC and the projector by analog connection using an analog RGB cable. On the other hand, in recent years, a network screen transfer system that connects a PC and a projector via a network has attracted attention.

  In this network screen transfer system, so-called screen capture is periodically performed on a screen displayed on an information processing device such as a PC, and image data acquired by screen capture is transmitted to a display device such as a projector.

  In this network screen transfer system, as in Japanese Patent Application Laid-Open No. H10-228707, a configuration that requires a password input when establishing a connection between a PC and a projector is common. This is also a useful function for preventing unauthorized video data from being projected to the projector being used from the outside.

JP 2003-69923 A

When transferring an image to the display control device such as a projector from the PC via the network, for example, a projector and a power supply switching state, there is a possibility that the state is not performed projection. In such a case, before transferring an image from the PC to the projector via the network, it is necessary to change the projector to a state in which projection is performed.

An information processing apparatus according to the present invention is an information processing apparatus capable of establishing communication with a display control apparatus using a first protocol and transmitting image data to the display control apparatus. using protocols, detection means for detecting a state of the display control device, a display based on said state of being detected the display control unit by the detection means, for displaying a predetermined indication of the state of the display control device and control means, using a second protocol different from the first protocol, and a control means for performing processing for changing the power state of the display control device, the display control unit is controlled by said detecting means If the power state of the display unit is detected to be off state, and the predetermined index that has been displayed is designated by said display control means, said display control means, said conductive by the control means Displays a predetermined screen for state of the change process, the case where the power state of the display unit, wherein the display control device controls the detecting means is detected to be ON state, the power supply state by the control means the predetermined screen for changing process, characterized in that not displayed.

According to the present invention, it is possible to appropriately control the display control device in accordance with the power supply state .

It is a conceptual diagram of a screen transfer system. It is a block diagram of PC and a projector for implement | achieving this invention. It is a flowchart by the side of PC for implement | achieving this invention. It is a detailed flowchart on the PC side for realizing the present invention. It is an example of GUI for implement | achieving this invention. It is a command structure for implement | achieving this invention. It is a display example of a web page for implement | achieving this invention. It is a sequence diagram of the authentication for management for implement | achieving this invention. It is a state transition diagram on the projector side for realizing the present invention.

  Hereinafter, examples of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. The embodiments of the present invention show preferred modes of the invention and do not limit the scope of the invention.

<First Embodiment>
FIG. 1 shows a basic configuration according to the embodiment of the present embodiment. In this embodiment, a screen transfer system in which a personal computer 100 (hereinafter referred to as a PC) as an example of an information processing apparatus of the present invention and a projector 200 as an example of a display device form a communication network via a LAN 150 is taken as an example. explain. The PC 100 of the present embodiment captures and compresses the video being displayed on the display as image data. Then, the compressed image data is transmitted to a projector connected to the communication network. By performing this capture to transmission continuously, the PC 100 can send the screen displayed on the own device to the projector 200. On the other hand, the projector 200 receives and decodes the compressed data from the PC 100 and projects it. This image data transmission is realized by the first protocol for image data transmission.

  Hereinafter, main configurations of the PC 100 and the projector 200 configuring the screen transfer system of this embodiment will be described with reference to FIG. After the description of the configuration, the basic operation will be described.

  First, the main configuration of the PC 100 will be described.

  Reference numeral 101 denotes a CPU that controls the entire PC 100.

  Reference numeral 102 denotes a RAM, which is a main memory for storing data. The RAM 102 is mainly used as a storage area for various data such as an area for storing or developing a program executed by the CPU 101 and a work area for executing the program.

  Reference numeral 103 denotes a VRAM, which is used as an area for storing an image to be displayed on the display unit 106 to be described later. Note that the VRAM 103 may be the same as the RAM 102 as long as the speed of the RAM 102 is sufficiently high.

  Reference numeral 104 denotes a ROM that stores a boot program that the CPU 101 executes at initialization. In the boot program, an OS recorded in the HDD 105 described later is expanded in the RAM 102 and activated.

  Reference numeral 105 denotes a hard disk drive (hereinafter referred to as HDD), which is used for storing various programs such as application programs and OS and data.

  Reference numeral 106 denotes a display unit. The display unit 106 displays an image instructed by a display control unit 107 described later. The display unit 106 is, for example, a liquid crystal panel or an organic EL panel.

  Reference numeral 107 denotes a display control unit. The display control unit 107 performs a process of reading an image stored in the VRAM 103 and displaying the image on the display unit 106.

  An operation unit 108 receives input from the user. The operation unit 108 includes, for example, a keyboard, a mouse, a touch panel, and the like, and these input operations are transmitted to the CPU 101.

  Reference numeral 109 denotes a communication unit that communicates with an external device, specifically, the projector 200 via the communication network 150. The communication unit 109 is configured by an interface such as 1 Gigabit Ethernet (registered trademark), for example.

  Reference numeral 110 denotes an internal bus that connects the processing blocks described above.

  Next, a main configuration of the projector 200 will be described.

  A CPU 201 controls the entire projector 200.

  Reference numeral 202 denotes a RAM, which is a main memory that stores data. The RAM 202 is mainly used as a storage area for various data such as an area for storing or developing a program executed by the CPU 101 and a work area during execution of the program.

  Reference numeral 203 denotes a ROM. In the ROM 203, data such as a program and parameters for operating the projector 200 are written in advance, and the CPU 201 operates in accordance with the contents of the ROM 203.

  Reference numeral 204 denotes a VRAM, which is used as an area for storing an image projected by a projection unit 206 described later.

  Reference numeral 205 denotes a decoder, which decodes image data received from the PC 100 when it is encoded by an encoding method such as Jpeg.

  Reference numeral 206 denotes a projection unit. The projection unit 106 displays an image instructed by a projection control unit 207 described later. Specifically, the projection unit 206 includes a liquid crystal panel, a lens, and a light source.

  Reference numeral 207 denotes a projection control unit. The projection control unit 207 performs a process of reading an image stored in the VRAM 204 and projecting the image on the projection unit 107.

  An operation unit 208 receives input from the user. The operation unit 208 includes a button attached to the casing, a remote control reception unit that receives a user operation from a remote controller (not shown), and the input operations are transmitted to the CPU 201.

  A communication unit 209 communicates with an external device, specifically, the PC 100 via the communication network 150. The communication unit 209 is configured by an interface such as 1 Gigabit Ethernet (registered trademark), for example.

  Reference numeral 210 denotes an internal bus that connects the processing blocks described above.

  Next, the state transition of the projector 200 will be described with reference to FIG.

  First, when an AC power cable (not shown) is connected to the projector 200 and power is supplied to each unit, the CPU 201 is activated. When starting up, the CPU 201 first acquires the state of a lamp (not shown) via the projection control unit 207. If the lamp is normal, the CPU 201 transitions to the standby state of S900. On the other hand, when detecting that the lamp is burned out, the CPU 201 transitions to a lamp burnout state S902.

  The standby state S900 is a state where no image is projected. The CPU 201 controls the VRAM 204, the decoder 205, the projection control unit 207, and the projection unit 206 that are not used at the time of non-projection so as not to supply power. This state is an example of a power-off state. Here, when receiving a power-on event, the CPU 201 transitions to the projection state S901. The power-on event is generated by, for example, a button operation of the operation unit 208 or a remote control operation, or is notified by a command received by the communication unit 209.

  The projection state S901 is a state where an image is projected. The CPU 201 supplies power to all the blocks of the projector 200 to enable image projection. This state is an example of a power-on state. Here, when the CPU 201 receives the power-off event, the CPU 201 transits to the standby state S900. The power-off event is generated by, for example, a button operation of the operation unit 208 or a remote control operation, or is notified by a command received by the communication unit 209. Further, when the CPU 201 detects that a lamp (not shown) has been burned out via the projection control unit 207, the CPU 201 transitions to a lamp burnout state S902.

  The lamp burnout state S902 is a state in which the lamp cannot emit light, and is a state in which no image is projected. Similar to S900, the CPU 201 controls the VRAM 204, the decoder 205, the projection control unit 207, and the projection unit 206 that are not used during non-projection so that power is not supplied. In order to transition from this state to another state, the user needs to replace a lamp (not shown). When the CPU 201 detects that a lamp (not shown) has been replaced, the CPU 201 transitions to a standby state S900.

  In any of S900 to S902, the CPU 201 activates a web server that is a program stored in the ROM 203 at the time of activation. The web server function is a function for communicating with an external web client device such as a PC via HTTP (HyperText Transfer Protocol) via the communication unit 209. Specifically, it is a function of receiving a GET request for a predetermined page and returning a hypertext as a response, or receiving a POST request and performing an operation according to the content. In particular, the above power-on event and power-off event can be received by a POST request. The hypertext may be stored in the ROM 203 in advance or may be dynamically generated by the CPU 101 using a program stored in the ROM 23. In addition, authentication with a management user name and a management password is required for a predetermined page, and the number of users to be used can be limited. The management user name and the management password may be determined in advance and stored in the ROM 203, or may be registered by the user through the operation unit 208. A detailed management authentication sequence will be described later.

  Here, the normal operation of the screen transfer system of the present embodiment will be described.

  For simplification of description, it is assumed that bidirectional communication is possible between the communication unit 109 of the PC 100 and the communication unit 209 of the projector 200.

  First, normal operation of the PC 100 configuring the screen transfer system will be described. The normal operation described here is that one PC and one projector establish a network connection through an authentication process for screen transfer, send the screen data of the PC to the projector, the projector receives this, and the projection display It is a series of processing. The following operation is realized by a program that operates on the CPU 101 on the PC 100. In this embodiment, this program is a screen transfer application.

  First, when the user gives an instruction to start the screen transfer application via the operation unit 108, this instruction is notified to the CPU 101, and the flow of FIG. 3 is started.

  In S300, CPU 101 controls communication unit 109, issues a search command for a projector existing on the network, and waits for a response command from the projector. Here, the projector search command is issued using broadcast or multicast. If there is a projector capable of responding to the projector search command on the network, the response command is similarly returned from the projector using broadcast or multicast. The search command will be described with reference to FIG. Reference numeral 600 denotes an example of a search command. The command ID tag 600 indicates that the command represents a search.

  Next, when the communication unit 109 receives a response command in S <b> 301, the CPU 101 stores it in the RAM 102. The response command returned by the projector includes various information such as the IP address of the projector, whether connection with the projector is possible, whether a password for screen transfer is required for connection, the web page path, and service information. It is.

  Next, in S <b> 302, the CPU 101 analyzes the response command stored in the RAM 102, creates a list of connectable projectors, configures this as a GUI, and presents it to the user via the display unit 106. Here, if each projector is a projector that requires a screen transfer password upon connection from the response command, the CPU 101 configures the screen transfer password input screen as a GUI and presents it to the user via the display unit 106. To do. The GUI is constructed based on the information stored in the RAM 102 in S301, and details of this step will be described later.

  Next, when a projector to be connected is selected from the user via the operation unit 108 in S303, this command is notified to the CPU 101. Similarly, when a screen transfer password corresponding to the selected projector is input, the CPU 101 is notified of the screen transfer password. The CPU 101 generates a connection request command storing screen transfer password information, controls the communication unit 109, transmits the connection request command to the projector selected by the user, and waits for a reply to the command. If the projector does not require input of a screen transfer password for connection, a connection request command that does not store screen transfer password information is transmitted, and a reply to this command is awaited. The connection request command will be described with reference to FIG. Reference numeral 620 denotes an example of a connection request command. The command ID tag 621 indicates that the command represents a connection request, and the Password tag 622 indicates a screen transfer password.

  In step S <b> 304, when the communication unit 109 receives a response to the connection request command from the projector, the CPU 101 stores the response in the RAM 102.

  In step S <b> 305, the CPU 101 analyzes the connection request command response stored in the RAM 102, and determines whether or not the projector's own connection request is permitted. If the connection is permitted here, the process proceeds to S306. On the other hand, if the connection is not permitted because the screen transfer password authentication has failed, the process proceeds to S302, where the GUI is configured again and presented to the user.

  In step S <b> 306, the CPU 101 configures a GUI for controlling the start and stop of transmission processing of screen data to the projector, presents it to the user via the display unit 106, and proceeds to subsequent processing.

  The above is the description of the basic flow in which the PC and the projector establish the network connection through the authentication process, among the normal operations of the PC 100 configuring the screen transfer system.

  Subsequently, the flow of transmitting the screen data of the PC to the projector and projecting it will be described.

  When the user gives an instruction to start screen transfer via the operation unit 108, this command is notified to the CPU 101.

  Next, the CPU 101 controls the display control unit 107 to transfer the image data being displayed on the display unit 106 from the VRAM 103 to the RAM 102. Note that the capture described in this specification indicates this processing.

  Next, the CPU 101 performs processing for encoding the image data stored in the RAM 102 by the capture processing using a program for the screen transfer application. Here, it is assumed that the encoding method is Jpeg encoding generally used for compressing image data. Note that the compression method is not limited to this, and any mode can be used as long as it can be decoded by the projector 200 described later.

  Next, the CPU 101 controls the communication unit 109 to transmit the encoded image data stored in the RAM 102 to the projector 200.

  After the screen transfer start instruction, the PC 101 repeats the above-described capture, encoding, and screen data transmission processing periodically or in accordance with changes in the display unit 107 until the CPU 101 detects a screen transfer stop instruction from the user.

  The above is the description of the flow for transmitting the screen data of the PC to the projector and projecting it.

  Subsequently, a normal operation of the projector 200 configuring the screen transfer system will be described. The following operation is realized by a program that operates on the CPU 201 on the projector 200.

  First, the CPU 201 controls the communication unit 209 and waits for a search command and a connection request command from the PC described above.

  When the communication unit 209 receives the projector search command, the CPU 201 sends a response command storing various information such as its own IP address, information on whether connection from a PC can be accepted, and the necessity of a screen transfer password for connection. It is generated on the RAM 202.

  Next, the CPU 201 controls the communication unit 209 to broadcast or multicast the response command over the network.

  When the communication unit 209 receives the connection request command, the CPU 201 stores it in the RAM 202. As described above, the command includes a screen transfer password necessary for connection.

  Next, the CPU 201 compares the screen transfer password included in the connection request command stored in the RAM 202 with the screen transfer password necessary for connecting to the projector held in the ROM 203. If the screen transfer passwords match, a reply command describing that the connection is permitted is generated on the RAM 202, and if the screen transfer passwords do not match, a reply command describing that the connection is not permitted is generated in the RAM 202. Generate on top.

  Next, the CPU 201 controls the communication unit 209 to transmit a reply command to the connection request command to the PC that is the transmission source of the connection request command. If a screen transfer password is not required for connection, this password authentication process is not performed. The CPU 201 manages a PC that is permitted to be connected as a connection-permitted PC on the RAM 202 by the password authentication process, and performs control to perform subsequent image data reception, projection processing, and the like.

  The above is a description of a flow in which one PC and one projector establish a network connection through an authentication process in the normal operation of the projector 200 configuring the screen transfer system.

  Subsequently, the flow of receiving and projecting the screen data of the PC will be described.

  The CPU 201 controls the communication unit 209 and waits to receive image data from the PC.

  When the communication unit 209 receives the image data transmitted to the projector 200 by the above-described operation of the PC, the CPU 201 stores it in the RAM 202.

  Next, the CPU 201 controls the decoder 205 to perform a decoding process of JPEG encoded image data stored in the RAM 202. Here, the decoded image data is stored in the VRAM 204.

  Next, the CPU 201 controls the projection control unit 207 to read out the image data stored in the VRAM 204 and project and display it from the projection unit 206.

  The above is the normal flow until the projector 200 receives and projects the image data transmitted from the PC in the screen transfer system of the present embodiment.

  Here, a characteristic operation of the screen transfer system according to the present embodiment will be described with respect to a flow when a screen transfer system is constructed between a non-projection projector whose power supply is in a standby state or a lamp-out state and a PC. To do. Basically, it is the flow shown in FIG. 3 described above, and the flow inside S302 will be described in detail with reference to FIG.

  First, in S401, the CPU 101 displays a projector selection screen 500 illustrated in FIG. The projector selection screen 500 is a screen for the user to select a display destination projector for screen transfer. The projector selection screen 500 includes projector information display areas 501 a to 501 e for displaying a list of identification information of projectors in the network, and an OK button 502. Each projector information display area 501 in the list includes a screen transfer password input unit 503 and a selection button 504 which is a so-called radio button. In some cases, the projector information display area 501 may include indicators such as a power icon 506 and a lamp out icon 507, which will be described in detail later. In the present embodiment, an example in which five projector information display areas are provided has been described. However, the present invention is not limited to this, and the number may be any other number or a variable number. The projector information display area 501 is blank at this stage, and the contents are displayed in a later step.

  Next, after S402, the CPU 101 repeatedly executes S403 for the number of response commands stored in the RAM 102 in S301, that is, for the number of projectors detected on the network 150.

  Here, details of the response command will be described with reference to FIGS. 610a to 610d are examples of response commands, and the common configuration will be described below unless otherwise specified. This response command 610 includes a Command ID tag 611 indicating a response command and a Status tag 612 indicating a power state of the projector. In addition, it includes an IPAddress tag 613 that indicates an IP address that is located on its own network, a PJName tag 614 that indicates its own name, and a PJLocation tag 615 that indicates its own setting location. It also includes an isPasswordRequired tag 616 indicating whether a screen transfer password is required for connection. Further, a PowerCtrlPage tag 617 that is path information of a power control page on a web server mounted on the projector described above, and a SupportPage tag 618 that is path information of a support information page are included. Note that the SupportInfo tag 619 is not used in this embodiment.

  The IPAddress tag, PJName tag, PJLocation tag, and isPasswordRequired tag are setting values for each projector. On the projector side, the CPU 201 acquires these values from the ROM 203 and stores them to generate a response command. For example, in the case of the projector 200a, the IPAddress tag is “192.168.1.100”, the PJName tag is “PJ1”, the PJLocation tag is “RoomA”, and the isPasswordRequired tag is “TRUE”. In the case of the projector 200b, the IPAddress tag is “192.168.1.110”, the PJName tag is “PJ2”, the PJLocation tag is “RoomB”, and the isPasswordRequired tag is “TRUE”. These values are set as initial values, or are set in the ROM 203 of the projector via the operation unit 208 by the user.

  The status tag 612 is determined by the CPU 201 from the following three types according to the power state of the projector. That is, “PROJECTION” is in the projection state S901, “STANDBY” is in the standby state S900, and “LAMP_ERROR” is in the lamp out state S902. For example, the Status tag 612a is “PROJECTION”.

  The values of the PowerCtrlPage tag 617 and the SupportPage tag 618 are determined by the configuration of the projector's web server, and are stored as fixed values in the ROM 203.

  When the PC detects this type of command, the processing on the PC side after S402 becomes possible.

  After S402, the CPU 101 performs a loop for each response command. In the present embodiment, the description will be made on the assumption that a total of four response commands 610a-d have been received from the four projectors 200a-d.

  In S403, the CPU 101 sequentially displays the projector information display areas 501a to 501e in accordance with the response command from the uppermost stage for each loop. For example, when the response commands 610a to 610d are stored in the RAM 102, the CPU 101 performs display corresponding to the projector information display areas 501a to 501d, respectively.

  First, the CPU 101 displays projector information of the PJName tag 614, the PJLocation tag 615, and the IPAddress tag 613 in the projector information display area 501. In the example of the projector information display area 501a, the CPU 101 displays the character strings “PJ1” of the PJName tag 614a and “RoomA” of the PJLocation tag 615a. Further, the CPU 101 displays a numerical value “192.168.1.100” of the IP Address tag 613a.

  Next, the CPU 101 displays a screen transfer password input unit 503. Here, if the isPasswordRequired tag 616 is “FLASE” indicating that a screen transfer password is not required and the Status tag 612 is “PROJECTION” indicating that projection is in progress, the screen transfer password input unit 503 is grayed out. Input is not allowed. Screen transfer password input units 503b to 503d are examples). On the other hand, if the isPasswordRequired tag 616 is “TRUE” indicating that a screen transfer password is required and the Status tag 612 is “PROJECTION”, the CPU 101 validates the screen transfer password input unit 503. Input is possible (screen transfer password input unit 503a is an example).

  Next, the CPU 101 displays or hides an icon according to the Status tag 612. If the Status tag 612 is “PROJECTION”, the icon is not displayed. Examples are a Status tag 612a and an icon non-display portion 505a corresponding thereto, and a Status tag 612c and an icon non-display portion 505c corresponding thereto. If the Status tag 612 is “STANDBY”, the power icon 506 is displayed. An example is the Status tag 612b and the corresponding power icon 506b. If the Status tag 612 is “LAMP_ERROR”, a lamp out icon 507 is displayed. An example is a Status tag 612d and a lamp-out icon 507d corresponding to the Status tag 612d.

  The CPU 101 configures the power icon 506 and the lamp out icon 507 as so-called hyperlinks, and adds link information to the web site of the projector. More specifically, the power supply icon 506 adds link information to the url that connects the IPAddress tag 613 and the PowerCtrlPage tag 617. Specifically, in the example of the power supply icon 506b, since the IPAddress tag 613b and the PowerCtrlPage tag 617b are linked, the link is to “http://192.168.1.110/power.html”. . On the other hand, the lamp-out icon 507 is added with link information to the url that connects the IPAddress tag 613 and the SupportPage tag 618. Specifically, in the example of the power supply icon 506d, since the IPAddress tag 613d and the SupportPage tag 618d are connected, it is a link to “http://192.168.1.130/support.html”. .

  Next, the CPU 101 displays a selection button 504. At this time, in accordance with the Status tag 612, the selection button 504 is changed between normal display and grayout display. If the Status tag 612 is “PROJECTION”, the icon is normally displayed and can be selected by the user. Examples are the Status tag 612a and the corresponding selection button 504a, and the Status tag 612c and the corresponding selection button 504c. If the Status tag 612 is “STANDBY” or “LAMP_ERROR”, the selection button 504 is grayed out and cannot be specified by the user. Examples are the Status tag 612b and the corresponding selection button 504b, and the Status tag 612d and the corresponding selection button 504d.

  In step S <b> 404, the CPU 101 determines whether the user has selected the power icon 506 via the operation unit 108. When it determines with having selected, it changes to S405, and when that is not right, changes to S406.

  In step S <b> 405, the CPU 101 displays the link destination of the power icon 506 using the web browser application stored in the HDD 105, and the power state change process is started. Details of this step will be described with reference to the sequence diagram of FIG.

  First, the CPU 101 issues an HTTP GET request to the link destination URL of the power icon 506 via the communication unit 109 (S800). The projector 200 as the connection destination receives access from the CPU 101, and returns an HTTP status code 401 response indicating that authentication is required for the URL (S801). On the other hand, the CPU 101 displays an authentication screen 700 shown in FIG. 7A on the display unit 108 and prompts the user to input authentication information (S802). The authentication screen 700 includes a message 701 that prompts the user to input a management user name and a management password. Furthermore, it has a management user name input unit 702 for receiving input from the user, a management password input unit 703, an OK button 704 for notifying that the input has been completed, and a cancel button 705 for canceling the input. When the CPU 101 detects that the user has pressed the OK button 704, the CPU 101 adds a character string obtained by encoding the contents of the management user name input unit 702 and the management password input unit 703 by a predetermined method to the GET request. Then, a GET request is issued again to the connected projector (S803). On the other hand, on the projector side, the obtained authentication character string is decoded by a predetermined method to obtain a management user name and a management password. Then, they are collated with the management user name and the management password stored in the ROM 203. If they match, the projector 200 returns the hypertext of the web page together with the success response of the HTTP status code 200 (S804). CPU101 acquires it via the communication part 109, and displays it on a web browser.

  If the CPU 101 detects that the user has pressed the cancel button 705 on the authentication screen 700, or if the authentication fails, the CPU 101 deletes the authentication screen 700 and displays an error message (not shown).

  The display of the web browser will be described with reference to FIG. Reference numeral 706 denotes a power control screen displayed on the web browser. Reference numeral 707 denotes a URL input unit in which the URL being displayed has already been input. A message 708 is a message for indicating to the user that the screen is for power control. The standby state selection unit 709 and the projection state selection unit 710 are options for requesting the projector to change the state. In this example, the standby state selection unit 709 is selected by being surrounded by a solid rectangle, indicating that the projector is in the standby state S900. When the user selects the standby state selection unit 709, the CPU 101 detects this, and issues a power-off event to the projector through the communication unit 109 with an HTTP POST request. On the other hand, when the user selects the projection state selection unit 710, the CPU 101 detects this, and issues a power-on event to the projector through an HTTP POST request via the communication unit 109. Thereafter, the process proceeds to S413.

  On the other hand, in S <b> 406, the CPU 101 determines whether the user has selected the lamp-out icon 507 via the operation unit 108. When it determines with having selected, it changes to S407, and when that is not right, it changes to S408.

  In step S <b> 407, the CPU 101 displays the link destination of the lamp-out icon 507 using a web browser application stored in the HDD 105. Details are described below.

  First, the CPU 101 issues an HTTP (HyperText Transfer Protocol) GET request to the URL linked to the lamp-out icon 507 via the communication unit 109. The subsequent authentication sequence is the same as S405. If the authentication is successful, the projector as the connection destination returns the hypertext of the web page. The CPU 101 acquires it via the communication unit 109 and displays it on the web browser. This display will be described with reference to FIG. Reference numeral 711 denotes a support contact screen displayed on the web browser. Reference numeral 712 denotes a URL input unit in which a URL being displayed has already been input. The message 713 is a message for indicating that it is a screen for presenting support contact information to the user. The support information 714 is text indicating support contact information of the projector, and displays the name of the sales representative, the telephone number and email address for contacting, and the address of the web site where the support information is described. . Thereafter, the process proceeds to S413.

  On the other hand, in step S <b> 408, the CPU 101 determines whether the user has selected the selectable buttons 504 via the operation unit 108. When it determines with having selected, it changes to S409, and when that is not right, it changes to S410.

  Next, in S409, the CPU 101 stores the identifier of the selected selection button 504 in the RAM 102, and replaces the display of the selection button 504 with the selected one. Specifically, the display shows a state in which the selection button 504a is selected. Then, the process proceeds to S413.

  On the other hand, in S <b> 410, the CPU 101 determines whether or not the screen transfer password input unit 503 that can be input is input via the operation unit 108. When it determines with having input, it changes to S411, and when that is not right, it changes to S412.

  In step S411, the CPU 101 stores the identifier of the input screen transfer password input unit 503 and the input phrase in the RAM 102, and the display of the screen transfer password input unit 503 is input. Replace with something. Specifically, the screen transfer password input unit 503a is displayed. Then, the process proceeds to S413.

  On the other hand, in S <b> 412, the CPU 101 determines whether the user has pressed the OK button 502 via the operation unit 108. If it is determined that the button has been pressed, this flow ends. If not, the process proceeds to S413. When no selection button 504 is selected, even if the user presses the OK button 502, the CPU 101 determines that the button is not pressed.

  In step S413, the CPU 101 issues a search command similar to that in step S300 in order to update the projector state.

  Next, in S414, the CPU 101 stores the response from the projector in the RAM 102 as in S301. Thereafter, a transition is made to S402.

  In the present embodiment, an example of giving a hyperlink to an icon has been described, but the present invention is not limited thereto. The present invention can also be implemented by preparing a text hyperlink separately from the icon indicating the power state.

  In this embodiment, the projector is described as an example of the display device, but the present invention is not limited to this. For example, the present invention can be applied to any display device having a network such as a liquid crystal display or an organic EL display.

  In the present embodiment, HTTP has been described as an example of a method for remotely changing the power supply state, but the present invention is not limited to this. The present invention can be applied to any method that can instruct the projector to change the power state from a remote location via a network and has a second authentication mechanism different from the first authentication for screen transfer. For example, SNMP (Simple Network Management Protocol), FTP (File Transfer Protocol), or a unique protocol may be used. This protocol is an example of a second protocol.

  In the present embodiment, an example in which a web page path is acquired from a projector has been described. However, the present invention is not limited thereto. The correspondence with the web page path for each model may be stored in advance in the PC application, and the web page path may be determined using the model inquired of the projector. Further, the correspondence information between the model and the path of the web page may be acquired by inquiring a predetermined web site on the Internet.

  In this way, the web page for turning on the power is displayed on the PC for the projector that is not in the projection state, and the user can turn on the power by operating it. In this case, since authentication for management different from authentication for screen transfer is used, it is possible to prevent a user who is not an administrator from performing a power operation.

  As an additional effect, in order to display a web page for turning on the power, it is only necessary to select an icon. In particular, the trouble of checking the IP address of the projector and inputting it to the web browser is unnecessary. There is an effect of reducing.

  As an additional effect, in order to display a web page for turning on the power, an icon is displayed only for a projector that is not in the projection state. Therefore, the power state of the projector in the projection state is changed by mistake. There is an effect to prevent that.

  As a further additional effect, even if the projector is not in a projection state, it is possible to display a web page corresponding to the state of the projector in a different state such as a lamp burned out, thereby reducing the labor of the administrator. effective.

<Second Embodiment>
The present invention can be applied even when the first embodiment is modified as follows.

  The response command 610 in FIG. 6 is changed as follows. That is, the response command 610 does not have the PowerCtrlPage tag 617 and the SupportPage tag 618, but has a SupportInfo tag 619 instead. A SupportInfo tag 619 is a character string including service information such as a contact information of a sales representative. The value of the SupportInfo tag 619 may be stored in the ROM 203 in advance, or may be changed by the user such as a service person from the operation unit 208.

  A part of S403 in FIG. 4 is changed. That is, the CPU 101 does not configure the power source icon 506 and the lamp-out icon 507 as hyperlinks, but simply detects the user's selection.

  S405 is changed as follows. That is, the CPU 101 first displays an authentication screen 700 shown in FIG. 7A on the display unit 108 and prompts the user to input authentication information. The operation of the authentication screen 700 itself is the same as in the first embodiment. When the CPU 101 detects that the user has pressed the OK button 704, the CPU 101 issues a power-on command to the projector via the communication unit 109. The power-on command will be described with reference to FIG. The power-on command 630 includes a CommandID tag 631 indicating a power-on command, a UserName tag 632 indicating a management user name, and a Password tag 633 indicating a management password. Here, the CPU 101 generates the UserName tag 632 from the contents of the management user name input unit 702 and the Password tag 633 from the contents of the management password input unit 703.

  On the other hand, on the projector side that has received the power-on command 630, the CPU 201 confirms that the management user name and management password stored in the ROM 203 match the received management user name and management password. If they match, a power-on event is issued on the projector side. As a result, the projector side transitions to the projection state of S901. The CPU 101 receives the result of the match confirmation via the communication unit 109, and displays an error message (not shown) if they do not match.

  Thereafter, the process proceeds to S413.

  S407 is changed as follows. That is, the CPU 101 displays a lamp burnout warning screen 508 as shown in FIG. The lamp burnout warning screen 508 includes a service information display unit 509, and the CPU 101 displays a character string included in the SupportInfo tag 619. Further, the lamp-out warning screen 508 has an OK button 510. When the CPU 101 detects that the user has selected the OK button 510, the lamp-out warning screen 508 is deleted. Thereafter, the process proceeds to S413.

  According to the above, since a command is transmitted to turn on the projector directly from the PC regarding the projector that is not in the projection state, the user can turn on the projector. In this case, since authentication for management different from authentication for screen transfer is used, it is possible to prevent a user who is not an administrator from performing a power operation.

  As an additional effect, in order to turn on the power, simply select an icon and perform authentication, which has the effect of reducing labor.

[Other Embodiments]
In the above embodiment, a system including a PC and a projector has been described as an example, but the present invention is not necessarily limited thereto. For example, a mobile phone, a so-called tablet terminal, an imaging device, or the like may be used instead of the PC. Further, various displays such as a television, a so-called tablet terminal, or a PC may be used instead of the projector.

The present invention is also realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

Claims (14)

An information processing apparatus capable of establishing communication with a display control apparatus using a first protocol and transmitting image data to the display control apparatus,
Using the first protocol, a detection unit that detects the state of the display control device, and a predetermined index that indicates the state of the display control device based on the state of the display control device detected by the detection unit Display control means for displaying;
Using a second protocol different from the first protocol, and a control means for performing a process of changing the power state of the display control device,
When the detection unit detects that the power state of the display unit controlled by the display control device is in the off state and the predetermined index displayed by the display control unit is designated, the display control unit Displaying a predetermined screen for performing the power state change process by the control means;
When the detection unit detects that the power state of the display unit controlled by the display control device is on, a predetermined screen for performing the power state change process by the control unit is not displayed. A characteristic information processing apparatus.   The information processing apparatus according to claim 1, wherein the predetermined index is associated with a hyperlink for accessing the display control apparatus.   The information processing apparatus according to claim 2, further comprising receiving means for receiving information on a link destination of the hyperlink from the display control apparatus.   4. The information processing apparatus according to claim 1, further comprising a first authentication unit configured to perform first authentication for transmitting image data to the display control device. 5.   The information processing apparatus according to claim 2, further comprising: a second authentication unit that executes second authentication for accessing the display control apparatus using the hyperlink. The authentication is different from the first authentication for transmitting image data to the display control device and the second authentication for accessing the display control device using the hyperlink. The information processing apparatus according to any one of 2 and 3.   The display control means displays a list of display control devices in the network, and displays a predetermined index indicating the state of each display control device in association with the display control device in the list. The information processing apparatus according to claim 1. The display control means displays a list of display control devices in the network,
The display control means further includes a selection means for selecting any display control device from a list of display control devices in the network displayed by the display control means,
The information processing apparatus according to any one of claims 1 to 7, wherein the selection unit cannot select a display control device that is detected by the detection unit as the power supply state being turned off.   The information processing apparatus according to claim 1, wherein the display control apparatus is a projector. The display control device is a projector,
The display control means displays an index different from the predetermined index when the detection means detects that the projector lamp is turned off. The information processing apparatus according to item. The display control device is a projector,
The information processing apparatus according to claim 8, wherein the selection unit cannot select a display control device that is detected by the detection unit as being in a state in which a lamp of the projector is turned off.   12. The display control unit does not display the predetermined index when the detection unit detects that the power state of the display unit controlled by the display control device is an on state. The information processing apparatus according to any one of the above. A method for controlling an information processing apparatus capable of establishing communication with a display control apparatus using a first protocol and transmitting image data to the display control apparatus,
Based on the detection step of detecting the state of the display control device using the first protocol, and a predetermined index indicating the state of the display control device based on the state of the display control device detected in the detection step A display process to display;
Using a second protocol different from the first protocol, and performing a process of changing the power state of the display control device,
When it is detected in the detection step that the power of the display unit controlled by the display control device is turned off, and the predetermined index displayed in the display step is designated, the change in the power state in the control step A step of displaying a predetermined screen for performing processing,
When it is detected in the detection step that the power of the display unit controlled by the display control device is in an on state, a predetermined screen for performing the power state change process in the control step is not displayed. A control method for an information processing apparatus.   A computer-executable program for causing a computer to function as each unit of the information processing apparatus according to any one of claims 1 to 12.

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