JP6471771B2 - Display device, display system, method and program - Google Patents

Description

  The present invention relates to a display device that displays an arbitrary image, and more specifically, a display device that displays a display image of an information processing device and is capable of operating the information processing device and displays an arbitrary drawing image. , Display system, method and program.

  2. Description of the Related Art Conventionally, an electronic blackboard that displays a display image of an information processing apparatus on a large display and enables the operation thereof is used in a meeting in a company, an educational institution, an administrative organization, or the like.

  As an example of such an electronic blackboard, Patent Document 1 discloses an information processing apparatus that connects another information processing apparatus and displays and controls its screen. In this information processing apparatus, the information processing apparatus is operated by switching between the first operation mode for operating the information processing apparatus and the second mode for operating other information processing apparatuses.

  However, in the information processing apparatus described in Patent Document 1, in order to switch the information processing apparatus to be operated, the user must use an operation panel or a keyboard that is physically separated from the display screen of the information processing apparatus. There was a problem that usability was low.

  SUMMARY An advantage of some aspects of the invention is to provide a display device, a display system, a method, and a program that improve the operability when operating an information processing device connected to an image display device. .

  According to the present invention, a display device capable of operating an information processing device, the drawing device for drawing on the display screen of the display device, the receiving means for receiving the contact position of the drawing device with respect to the display screen, and the information processing A first interface for receiving a video signal transmitted from the apparatus, a second interface connected to the information processing apparatus, and display means for displaying an image based on the video signal received via the first interface on a display screen And a signal based on the contact position of the drawing device is generated when the contact position received by the receiving means is within an area where an image based on the video signal on the display screen is displayed, and the generated signal is transmitted to the second interface. A display device having transmission means for transmitting to the information processing device via the network is provided.

  The image display apparatus of the present invention can improve the operability when operating the information processing apparatus connected to the display apparatus by adopting the above configuration.

The figure which shows the image display system of this invention. The figure which shows the hardware constitutions of the image display apparatus of this invention. The figure which shows the hardware constitutions of the drawing apparatus of this invention. The figure which shows the function structure of the controller which the image display apparatus of this invention has. The figure which shows the process which the controller which the image display apparatus of this invention has is performed. The figure which shows the process which the controller which the image display apparatus of this invention has when drawing mode is selected. The figure which shows the process which the controller which the image display apparatus of this invention has when deletion mode is selected. The figure which shows the process which the controller which the image display apparatus of this invention has when the selection mode is selected.

  Hereinafter, although this invention is demonstrated with embodiment, this invention is not limited to embodiment mentioned later.

  FIG. 1 shows an image display system 100 of the present invention. The image display system 100 includes an image display device 110 and a user PC 130, and the image display device 110 and the user PC 130 are connected by cables 124 and 126.

  The image display device 110 is a device that displays a display image of the user PC 130 and enables the operation thereof, and displays a drawing image created by the user. The image display device 110 includes a display 112, a video input interface 120, and an output interface 122.

  The display 112 is a display device that displays various images such as a display image of the user PC 130 and a drawing image created by the user. On the display 112, a display image 116 of the user PC 130 and GUI (Graphical User Interface) buttons 118a, 118b, and 118c for operating the image display device 110 are displayed. In addition, the display 112 is provided with a coordinate detection device 114 that is a means for detecting contact and approach of an object such as a finger or a dedicated pen.

  The video input interface 120 is an interface that receives a video signal that forms the display image 116 of the user PC 130. In the present embodiment, a DVI connector configured by a DVI (Digital Visual Interface) terminal can be employed as the video input interface 120. The video input interface 120 receives a VGA signal from the user PC 130 via a cable 124 such as a VGA cable, and supplies the VGA signal to the image display device 110.

  In other embodiments, a Video Graphics Array (VGA) connector, a High-Definition Multimedia Interface (HDMI) (registered trademark) connector, a Displayport connector, or the like can be employed. In still another embodiment, the video input interface 120 may receive a video signal from the user PC 130 by wireless communication complying with a wireless communication protocol such as Bluetooth (registered trademark) or WiFi.

  The output interface 122 is a physical interface that outputs a display image of the image display device 110 and an event for operating the user PC 130. In the present embodiment, a USB socket can be adopted as the output interface 122.

  The user PC 130 is an information processing device that provides an image to be displayed on the image display device 110. The user PC 130 includes an interface that outputs a video signal, and an image display device that generates a video signal that forms an image displayed on the display image of the user PC 130 at a predetermined rate (for example, 50 to 60 fps (frame per second)). 110. In the present embodiment, the user PC 130 includes a VGA output terminal as an interface, and can transmit a VGA signal to the image display device 110. In another embodiment, the user PC 130 may transmit the display image by wireless communication complying with various wireless communication protocols.

  Further, the user PC 130 has a USB port, and receives signals forming various events (hereinafter referred to as “input device events”) issued by an input device such as a mouse or a keyboard from the image display device 110. Then, processing corresponding to the input device event is executed.

  In the embodiment shown in FIG. 1, a notebook PC is adopted as the user PC 130. However, in other embodiments, an information processing apparatus capable of supplying a video signal such as a desktop PC, a tablet PC, or a PDA may be adopted. it can.

  FIG. 2 is a diagram illustrating a hardware configuration of the image display apparatus 110 according to the present invention. The image display device 110 includes a controller 200, a receiving unit 202, a display 112, and a coordinate detection device 114.

  The controller 200 is an image display control device that performs overall control of the image display device. The controller 200 can be configured by LSI (Large Scale Integration). The functional configuration of the controller 200 will be described in detail with reference to FIG.

  The receiving unit 202 is a functional unit that receives a wireless signal from the drawing apparatus 210. The drawing device 210 can create a drawing image, delete the drawing image, and select an image object such as a GUI button displayed on the display 112 by the mode switching unit. The drawing device 210 can display the image on the image display device 110. It detects that the display area of the display 112 as a device has been touched, and transmits a signal indicating contact (hereinafter referred to as “contact signal”) to the image display device 110 by radio. The receiving unit 202 transmits a contact signal to the coordinate detection device 114.

  In this embodiment, a coordinate input / detection device based on an infrared ray blocking method as shown in Patent Document 2 is adopted as the coordinate detection device 114. In this coordinate input / detection device, two light emitting / receiving devices installed at both lower ends of the display 112 emit a plurality of infrared rays in parallel with the display 112, and are reflected by reflecting members provided around the display 112. Light reflected on the same optical path is received. The coordinate detection device 114 notifies the coordinate detection device driver of the controller 200 of the infrared identification information emitted by the two light emitting / receiving devices blocked by the drawing device 210. The coordinate detection device driver uses the infrared identification information to identify the blocked infrared rays, and calculates the contact position or approach position (hereinafter referred to as “coordinate position”) of the drawing device 210.

  In another embodiment, a capacitance-type coordinate detection device that specifies a contact position by detecting a change in capacitance, and a resistance film-type coordinate that specifies a contact position based on a voltage change between two opposing resistance films. Various detection means such as a detection apparatus and an electromagnetic induction type coordinate detection apparatus that detects electromagnetic induction caused by contact of a contact object with the display and identifies a contact position may be employed.

  The image display device 110 includes a network interface 204, and can transmit image data such as a display image and a drawing image on the display 112 via a network.

  FIG. 3 is a diagram showing a hardware configuration of the drawing apparatus of the present invention. Hereinafter, the hardware configuration of the drawing apparatus 210 will be described.

  The drawing apparatus 210 includes a tip portion 300, a contact detection sensor 302, a signal processing unit 304, a signal transmission unit 306, and mode switching units 308 and 310 that constitute a contact detection unit.

  The tip portion 300 is a movable member that should contact the display 112. When the front end portion 300 contacts the display 112, the front end portion 300 moves in the longitudinal direction of the drawing device 210, and the rear end contacts the contact detection sensor 302. An elastic member (not shown) such as a spring is provided between the distal end portion 300 and the contact detection sensor 302. When the distal end portion 300 is separated from the coordinate detection device 114, the elastic position causes the original position. Return to.

  The contact detection sensor 302 is a sensor that detects that the tip portion 300 is in contact. In the present embodiment, a pressure sensor such as Nita Corporation's FlexiForce (trademark) or Inaba Rubber Co., Ltd. Inastomer (registered trademark) can be employed as the contact detection sensor 302, and the tip portion 300 contacts the contact detection sensor 302. Then, the resistance value of the current in the contact detection sensor 302 changes.

  The signal processing unit 304 is a unit that monitors the contact detection sensor 302 and determines whether or not the drawing apparatus 210 is in contact. In the present embodiment, a semiconductor circuit can be employed as the signal processing unit 304, and includes a voltage conversion circuit, an A / D conversion circuit, a storage circuit, a determination circuit, and an output circuit.

  When the signal processing unit 304 detects a change in the resistance value of the contact detection sensor 302, the voltage conversion circuit converts the change in the resistance value of the contact detection sensor 302 into a voltage, and the A / D conversion circuit converts the change in the voltage conversion circuit. The converted voltage is converted into a digital contact value.

  The determination circuit compares a predetermined threshold value stored in the storage circuit with the contact signal, determines whether or not the tip portion 300 has touched the display 112, and transmits the determination result to the output circuit.

  In the present embodiment, a change in resistance value caused by actual contact of the tip portion 300 with the display 112 is converted into a voltage, and the digitally converted value can be set as a predetermined threshold value. If it is greater than or equal to the threshold, it is determined that the tip 300 has contacted the display 112. On the other hand, when the change in resistance value is smaller than the predetermined threshold, it is determined that the tip portion 300 is not in contact with the display 112.

  Further, the determination circuit detects pressing of the mode switching units 308 and 310 serving as operation mode switching means, and a signal indicating the type of the mode switching unit pressed by the user (hereinafter referred to as “switching unit type signal”). To the output circuit. The mode switching units 308 and 310 are mechanisms that can select a drawing mode, a deletion mode, and a selection mode provided by the image display device 110. The drawing mode is a mode in which the user can create a drawing image. The deletion mode is a mode in which a drawing image created by the user can be deleted. The selection mode is a mode in which an image object such as a GUI button displayed on the display 112 can be selected and an event can be transmitted to the user PC 130.

  In the present embodiment, the mode switching unit 308 that is the first button is a button that can specify the deletion mode, and the mode switching unit 310 that is the second button is a button that can specify the selection mode. In this embodiment, the mode can be specified using two mode switching units, but in other embodiments, the mode may be specified using one or three mode switching units.

  When the user presses the mode switching units 308 and 310, the mode switching units 308 and 310 transmit a switching unit type signal to the output circuit via the signal line.

  The output circuit outputs the contact signal output from the determination circuit and the switching unit type signal to the signal transmission unit 306. The contact signal includes a value indicating that the drawing apparatus 210 has touched the display 112 (true) and a value indicating that the drawing device 210 has not touched (false). The output circuit periodically outputs a contact signal and a switching unit type signal. In other embodiments, the output circuit may output a contact signal when the drawing device 210 touches the display 112 or leaves the display 112.

  The signal transmission unit 306 is means for transmitting the contact signal and the switching unit type signal output from the output circuit to the image display device 110. In the present embodiment, the signal transmission unit 306 transmits a contact signal and a switching unit type signal to the image display device 110 by wireless communication such as infrared rays and Bluetooth (registered trademark), but in other embodiments, these signals are transmitted. May be transmitted to the image display device 110 via a signal line.

  In the present embodiment, since the operation mode can be switched using the drawing device 210, for example, when the user is creating a drawing image with the drawing device 210, the user uses the drawing device 210 at hand. Since the drawing mode can be deleted by switching the operation mode to the deletion mode, and then the creation of the drawing image can be continued by switching the operation mode to the drawing mode, usability can be further improved.

  FIG. 4 is a diagram illustrating a functional configuration of the controller 200 of the image display device 110. The image display device 110 includes an OS (Operating System) 400, an application unit 410, a video signal input unit 422, and a coordinate detection device driver 424.

  The video signal input unit 422 is a functional unit that processes a video signal transmitted by the user PC 130. Specifically, the video signal input unit 422 A / D converts a video signal such as a VGA signal received from the user PC 130 and supplies the video signal to the application unit 410.

  The OS 400 is a functional unit that performs overall control of the controller 200. The OS 400 receives various events issued by the coordinate detection device driver 424 and notifies the application unit 410 of them.

  In the present embodiment, an OS such as WINDOWS (registered trademark) series, UNIX (registered trademark), LINUX (registered trademark), TRON, ITRON, and μITRON can be adopted as the OS 400, and a processor (not shown) of the controller 200 is included. ) Executes the program of the present invention described in a program language such as assembler, C, C ++, Java (registered trademark), JavaScript (registered trademark), PERL, RUBY, or PYTHON under the management of these OSs.

  The coordinate detection device driver 424 is a functional unit that controls the coordinate detection device 114. When the coordinate detection device driver 424 receives a contact signal from the coordinate detection device 114, an event (TOUCH) for notifying that the drawing device 210 has touched or approached the display 112, a state in which the drawing device 210 has touched or approached the display 112 Then, an event (MOVE) for notifying that the contact point or the approach point has moved is issued, and an event (RELEASE) for notifying that the drawing apparatus 210 has moved away from the display 112 are issued to notify the OS 400.

  The coordinate detection device driver 424 identifies the coordinate position of the drawing device 210 using the infrared identification information received from the coordinate detection device 114, and indicates the coordinate position (hereinafter referred to as "coordinate position information"). Are added to various events (TOUCH, MOVE, RELEASE). A plurality of pieces of coordinate position information are added to the event (MOVE). In addition, the coordinate detection device driver 424 uses the switching unit type signal received from the coordinate detection device 114 to determine the type of the mode switching units 308 and 310 pressed by the user, and identifies the mode switching unit in these events. Add information. When the mode switching units 308 and 310 are not pressed, that is, when the switching unit type signal is not received, the coordinate detection device driver 424 does not add the identification information of the mode switching unit to the event.

  The application unit 410 is a functional unit that processes an image displayed on the display 112, and includes a video signal processing unit 412, an event processing unit 414, a drawing unit 416, a deletion unit 418, and an operation unit 420. Composed.

  The video signal processing unit 412 is a functional unit that processes the video signal supplied from the video signal input unit 422. The video signal processing unit 412 generates a display image of the user PC 130 from the video signal and displays it on the display 112. The video signal processing unit 412 stores the image displayed on the display 112 in a predetermined area (hereinafter referred to as “background image storage area”) of a storage device such as a RAM provided in the controller 200.

  The event processing unit 414 is a functional unit that processes an event received from the OS 400. Specifically, the event processing unit 414 sends an event (TOUCH), an event (MOVE), and an event (RELEASE) to the drawing unit 416, the deletion unit 418, and the operation unit 420 that are to execute processing corresponding to the event received from the OS 400. To be notified.

  The drawing unit 416 is a functional unit that creates a drawing image and displays it on the display 112. The drawing unit 416 generates a drawing image in which the color of the coordinate position indicated by the coordinate position information included in the event received from the event processing unit 414 is changed to a predetermined color. Then, the drawing unit 416 acquires an image from the background image storage area, combines it with the drawn image, and displays it on the display 112.

  The drawing unit 416 stores the drawing image displayed on the display 112 in a predetermined area (hereinafter referred to as “drawing image storage area”) of a storage device such as a RAM provided in the controller 200. At this time, the drawing unit 416 stores information indicating the coordinate position where the drawing image is formed in the drawing image storage area as metadata of the drawing image. In addition, the drawing unit 416 stores the combined image in a predetermined area (hereinafter referred to as “composited image storage area”).

  The deletion unit 418 is a functional unit that deletes the drawn image. The deletion unit 418 compares the coordinate position indicated by the coordinate position information included in the event received from the event processing unit 414 with the coordinate position where the drawing image is formed, and if these coordinate positions match, the composite image Is changed to the color of the corresponding background image. Then, the deletion unit 418 displays the changed composite image on the display 112 and stores it in the composite image storage area.

  In the present embodiment, in the background image storage area and the composite image storage area, the colors of the pixels constituting these images are stored for each coordinate position, and the deletion unit 418 stores the composite image corresponding to the drawing image to be deleted. Can be specified, and the color of the background image corresponding to this can be specified.

  The operation unit 420 is a functional unit that instructs an operation on the image display device 110 or the user PC 130. In the operation unit 420, the coordinate position indicated by the coordinate position information included in the event received from the event processing unit 414 is an area of an image object indicating an instruction to the image display device 110 or an area where a display image of the user PC 130 is displayed. Determine whether or not.

  When the coordinate position indicated by the coordinate position information is within the area of the image object indicating an instruction to the image display device 110, the operation unit 420 issues an event to the OS 400 that the image object is selected. If the coordinate position indicated by the coordinate position information is an area where the display image of the user PC 130 is displayed, the operation unit 420 changes the coordinate position to a coordinate position that matches the resolution of the display image of the user PC 130, and changes the coordinate position. The input device event is transmitted to the user PC 130 together with the coordinate position.

  In this embodiment, since the image display device 110 includes functional means for controlling the coordinate detection device 114 and functional means for generating a drawn image and superimposing it on the background image, software such as a control driver having these functions. Need not be installed on the user PC 130.

  FIG. 5 is a flowchart showing processing executed by the image display apparatus of the present invention. Hereinafter, the processing executed by the controller 200 of the image display device 110 will be described with reference to FIG.

  The process in FIG. 5 starts from step S500, and in step S501, the event processing unit 414 of the controller 200 determines whether an event issued by the coordinate detection device driver 424 has been detected. If no event is detected (no), the process of step S501 is repeated. On the other hand, if an event is detected (yes), the process branches to step S502.

  In step S502, the event processing unit 414 uses the identification information of the mode switching unit added to the event to determine whether or not the first button for designating the deletion mode has been pressed, and the first button is pressed. If it is determined that the determination has been made (yes), the process branches to step S506. In step S506, the event processing unit 414 notifies the event detected in step S501 to the deletion unit 418, and the process returns to step S501.

  On the other hand, if it is determined in step S502 that the first button has not been pressed (no), the process branches to step S503. In step S503, the event processing unit 414 uses the identification information of the mode switching unit added to the event to determine whether or not the second button for designating the selection mode has been pressed, and the second button is pressed. If it is determined that the determination has been made (yes), the process branches to step S505. In step S505, the event processing unit 414 notifies the event detected in step S501 to the operation unit 420, and the process returns to step S501.

  On the other hand, if it is determined in step S503 that the second button has not been pressed (no), the process branches to step S504. In step S504, the event processing unit 414 notifies the drawing unit 416 of the event detected in step S501, and returns the process to step S501.

  FIG. 6 is a flowchart showing processing executed by the image display apparatus of the present invention. Hereinafter, a process executed by the controller 200 of the image display apparatus 110 when the drawing mode is selected will be described with reference to FIG.

  The process in FIG. 6 starts when the drawing unit 416 receives an event from the event processing unit 414 in step S600. In step S601, the drawing unit 416 determines whether the event type is TOUCH or MOVE. If the event type is TOUCH or MOVE (yes), the process branches to step S602. On the other hand, if the event type is not TOUCH or MOVE, that is, RELEASE (no), the process branches to step S607 and ends.

  In step S602, the drawing unit 416 generates a drawing image using the coordinate position information added to the event. In step S603, the drawing unit 416 stores the drawing image in the drawing image storage area. In step S604, the drawing unit 416 acquires a background image from the background image storage area and combines it with the drawn image. In step S605, the drawing unit 416 displays the composite image generated in step S604 on the display 112. In step S606, the drawing unit 416 stores the composite image in the composite image storage area, and the process ends in step S607.

  FIG. 7 is a flowchart showing processing executed by the image display apparatus of the present invention. Hereinafter, a process executed by the controller 200 of the image display apparatus 110 when the deletion mode is selected will be described with reference to FIG.

  The processing in FIG. 7 starts when the deletion unit 418 receives an event from the event processing unit 414 in step S700. In step S701, the deletion unit 418 determines whether the event type is TOUCH or MOVE. If the event type is TOUCH or MOVE (yes), the process branches to step S702. On the other hand, if the event type is not TOUCH or MOVE, that is, RELEASE (no), the process branches to step S707 and ends.

  In step S702, the deletion unit 418 acquires coordinate position information of the drawing image stored in the drawing image storage area. In step S703, the deletion unit 418 compares the coordinate position information added to the event and the coordinate position information of the drawing image, and determines whether or not the coordinate positions indicated by these coordinate position information overlap. If the coordinate positions overlap (yes), the process branches to step S704. On the other hand, if the coordinate positions do not overlap (no), the process branches to step S707 and ends.

  In step S704, the deletion unit 418 obtains a composite image from the composite image storage area, displays the color of the pixel indicated by the coordinate position in the composite image, and the coordinate position in the background image stored in the background image storage area. The drawing image indicated by the coordinate position is deleted by changing to the color of the indicated pixel. In step S705, the deletion unit 418 displays the composite image changed in step S704 on the display 112. In step S706, the deletion unit 418 stores the composite image displayed on the display 112 in the composite image storage area, and the process ends in step S707.

  FIG. 8 is a flowchart showing processing executed by the image display apparatus of the present invention. Hereinafter, a process executed by the controller 200 of the image display apparatus 110 when the selection mode is selected will be described with reference to FIG.

  8 starts when the operation unit 420 receives an event from the event processing unit 414 in step S800. In step S801, the operation unit 420 determines whether the event type is RELEASE. If the event type is RELEASE (yes), the process branches to step S802. On the other hand, if the event type is not RELEASE, that is, if it is TOUCH or MOVE (no), the process branches to step S806 and ends.

  In step S802, the operation unit 420 uses the coordinate position information added to the event to determine to which region the coordinate position indicated by the coordinate position information belongs. If the coordinate position belongs to the image object area, the process branches to step S803. In step S803, the operation unit 420 issues an event to the OS 400 that the image object indicated by the coordinate position has been selected, and the process ends in step S806.

  If it is determined in step S802 that the coordinate position belongs to the display image area of the user PC 130, the process branches to step S804. In step S804, the operation unit 420 changes the coordinate position indicated by the coordinate position information added to the event to match the resolution of the display image of the user PC 130. The resolution of the display image of the user PC 130 may be defined in advance, or the video signal processing unit 412 may analyze and calculate the video signal received from the user PC 130.

  In step S805, the operation unit 420 adds coordinate position information indicating the changed coordinate position to the input device event indicating that the coordinate position is selected, and transmits it to the user PC 130, and the process ends in step S806.

  If it is determined in step S802 that the coordinate position belongs to another area, the process branches to step S806 and ends.

  Although one embodiment of the present invention has been described so far, the present invention is not limited to the above-described embodiment, and the components of the present embodiment are changed or deleted, or the components of the present embodiment are replaced. It can be changed within a range that can be conceived by those skilled in the art, such as adding other components, and any aspect is included in the scope of the present invention as long as the effects of the present invention are exhibited. .

  In particular, in the above-described embodiment, the controller displays an image on a display configured integrally with the image display device. In other embodiments, the controller is a display device that can project an image such as a projector. An image may be projected and displayed on a display surface such as a screen. In this case, a sensor for detecting a contact position or an approach position of the drawing device is provided on the screen or the display device, and the controller has a region on the display surface on which the image is projected, that is, the contact position of the drawing device with respect to the display region of the display device. Information or approach position information can be obtained from the sensor.

DESCRIPTION OF SYMBOLS 100 ... Image display system, 110 ... Image display apparatus, 112 ... Display, 114 ... Coordinate detection apparatus, 116 ... Display image, 118a, 118b, 118c ... GUI button, 120 ... Video input interface, 122 ... Output interface, 124, 126 ... Cable, 130 ... User PC

JP 2002-91654 A Japanese Patent No. 4627781

Claims (8)

A display device capable of operating an information processing device, having a display, and capable of specifying a contact position of a drawing device with respect to a display screen of the display,
A first interface for receiving a video signal transmitted from the information processing apparatus;
A second interface connected to the information processing apparatus;
Display means for displaying an image based on the video signal received via the first interface in a partial area of the display screen;
When the contact position is within the partial area where an image based on the video signal on the display screen is displayed, a signal based on at least the contact position of the drawing device is generated, and the generated signal is And a transmission unit configured to transmit to the information processing apparatus via the second interface. The transmission means includes
When the contact position is within the partial area where an image based on the video signal on the display screen is displayed, an event issued by a mouse or a keyboard based on at least the contact position of the drawing device The display device according to claim 1, wherein the signal to be formed is generated, and the generated signal is transmitted to the information processing device via the second interface in order to operate the information processing device. The drawing device includes a button that can be pressed by a user to perform an operation of deleting a drawn drawing image,
The display device according to claim 1, wherein when the button is pressed, execution of a deletion process for deleting a drawn image is controlled using the drawing device. When the contact position is within the partial area where an image based on the video signal on the display screen is displayed, the contact position is based on at least the contact position of the drawing device according to the resolution of the screen of the information processing device A signal is generated, and the generated signal is transmitted to the information processing apparatus via the second interface, thereby controlling the display apparatus to perform an operation process on the information processing apparatus.
The display apparatus as described in any one of Claims 1 thru | or 3. The display device according to claim 1, wherein the first interface is any one of VGA, HDMI (registered trademark), and DisplayPort. The display device according to claim 1, wherein the second interface is a USB. A display device capable of operating an information processing device, having a display, and capable of specifying a contact position of a drawing device with respect to a display screen of the display, wherein the display device receives a video signal transmitted from the information processing device. A display device including a first interface and a second interface connected to the information processing apparatus, the method comprising:
Displaying an image based on the video signal received via the first interface in a partial area of the display screen;
When the contact position is within the partial area where an image based on the video signal on the display screen is displayed, a signal based on at least the contact position of the drawing device is generated, and the generated signal is Transmitting to the information processing apparatus via the second interface.   A computer-readable program for causing a display device to execute the steps according to claim 7.