JP2011128257A - Image display device, and control method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device capable of recognizing easily a fact that an image signal is not input into an input terminal (selected input terminal) through a confirmation image displayed when selecting an input terminal into which the image signal is not input. <P>SOLUTION: When an image signal is not input into an image input terminal (selected input terminal) selected by a user, a projector 10 displays a confirmation image including an image near the selected input terminal of an external apparatus connection part 70, and an image showing a terminal shape of a cable to be connected to the selected input terminal, together with a message for confirming connection of the cable to the selected input terminal. Consequently, the user can confirm easily whether or not the reason why the image signal is not input into the selected input terminal from the confirmation image is a fact that the cable is not connected correctly to the selected input terminal. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image display apparatus including a plurality of input terminals to which video signals are input and a control method thereof.

  For example, image display devices such as televisions and projectors are generally provided with a plurality of external input terminals. When a user selects a specific external input terminal by remote control operation, the external input terminal An image corresponding to the video signal input from the terminal can be displayed.

  Further, as described in Patent Document 1, an image corresponding to each of a plurality of external input terminals is displayed on the touch panel operation screen, and an image corresponding to a video signal from the external input terminal selected by the user through the touch panel operation is displayed. Projectors for projecting are known.

JP 2003-323168 A

  However, for example, in the method of displaying the type of the external input terminal on the upper part of the display image or the like, when a video signal is not input to the selected external input terminal, a monochrome solid image is displayed together with the type of the external input terminal. The user was unable to determine whether the image display device itself was malfunctioning or the video signal was not input to the external input terminal due to the cable not being connected to the selected external input terminal. .

  In order to solve the above-described problems, the present invention provides, as one form, an image display device including a plurality of video signal input terminals, and a selected input terminal selected by a user among the plurality of input terminals. A display unit that displays an image corresponding to the video signal input to the video signal, a video signal detection unit that detects whether the video signal is input to the selection input terminal, and the selection in the video signal detection unit A confirmation image output unit for displaying a confirmation image on the display unit indicating that the video signal is not input to the selection input terminal when it is detected that the video signal is not input to the input terminal; An image display device is provided.

  According to such an image display device, it is recognized that a video signal is not input to the input terminal (selected input terminal) through a confirmation image displayed when an input terminal to which no video signal is input is selected. be able to.

  In the image display device, the confirmation image output unit preferably displays the confirmation image indicating the shape of the selection input terminal on the display unit.

  This allows the user to look for the shape of the selected input terminal displayed in the confirmation image when searching for the selected input terminal from among the multiple input terminals in order to check whether the transmission cable is connected to the selected input terminal. Because it can be searched, it is hard to mistake with other input terminals.

  In the image display device, it is preferable that the confirmation image output unit displays the confirmation image in which the selection input terminal is highlighted with respect to the other input terminals on the display unit.

  Thereby, when a user searches for a selection input terminal from among a plurality of input terminals, the selection input terminal can be searched without making a mistake with other input terminals.

  In the image display device, it is preferable that the confirmation image output unit displays the confirmation image indicating a terminal shape of a cable to be connected to the selection input terminal on the display unit.

  Thereby, the user can easily confirm whether or not a cable having a correct terminal shape is connected to the selected input terminal.

  In the image display device, it is preferable that the confirmation image output unit includes a confirmation image storage unit that stores the confirmation image.

  Further, in the image display device, the video signal detection unit receives the video signal at each input terminal in response to a search operation for searching for the input terminal to which the video signal is input from a plurality of the input terminals. The confirmation image output unit detects whether or not the video signal is input to any of the input terminals, and displays the confirmation image on the display unit. It is preferable.

  In the image display device, the video signal detection unit receives the video signal from the other input terminal in response to a switching operation for switching the currently selected input terminal to the other input terminal. Preferably, the confirmation image output unit displays the confirmation image on the display unit when it is detected that the video signal is not input to the other input terminal.

  In another aspect, the present invention provides a plurality of input terminals to which video signals are input, and a display unit that displays an image according to the video signals input to the input terminals selected from the plurality of input terminals. A display step of displaying an image corresponding to the video signal input to the input terminal selected from the plurality of input terminals on the display unit; and A video signal detection stage for detecting whether or not the video signal is input, and when it is detected that the video signal is not input to the selected input terminal, the video signal is input to the input terminal. There is provided a control method for an image display device, comprising: a confirmation image output step of displaying a confirmation image indicating that the image has not been input on the display unit.

1 is a perspective view of a projector 10 according to an embodiment of the invention. 2 is a rear view of the projector 10. FIG. 3 is a plan view showing an operation surface of a remote controller 150. FIG. FIG. 2 is a functional block diagram showing an internal configuration of the projector. An example of the operation | movement flow regarding the selection operation | movement of the input terminal in the projector 10 is shown. An example of a confirmation image is shown.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. However, the following embodiment does not limit the invention according to the claims, and all combinations of features in the embodiment are based on the invention. It is not always essential to the solution.

  FIG. 1 is a perspective view of a projector 10 according to an embodiment of the invention. As shown in FIG. 1, the projector 10 according to the present embodiment has a projection lens 85 arranged at the center of the front surface of the external housing, and a state indicator 90 that indicates the operating state of the projector 10 is provided at the upper end of the front surface. Is provided. A receiving unit 55 that receives a signal from a remote controller 150 (described later) is provided at the lower part of the front surface of the external housing. The projector 10 is an example of an image display device according to the present invention.

  FIG. 2 is a rear view of the projector 10. As shown in FIG. 2, on the rear surface of the projector 10, a speaker 35 that outputs sound of a projected image projected by the projector 10, an operation panel 50 on which operation buttons for operating the projector 10 are arranged, and In addition, an external device connection unit 70 including a plurality of terminals for connecting to various external devices is provided.

  In this example, the external device connection unit 70 includes a monitor output terminal 70A, an audio output terminal 70B, a computer 2 input terminal 70C, an audio input terminal 70D, an HDMI input terminal 70E, a LAN terminal 70F, USB terminals 70G and 70H, and S-video. It includes an input terminal 70I, a video 2 input terminal 70J, an audio input terminal 70K, an RS-232C terminal 70L, a computer 1 input terminal 70M, a video 1 input terminal 70N, and a BNC input terminal 70P. The function of each of these terminals is as follows, for example.

  The monitor output terminal 70A is a terminal for connecting to the monitor, and the video input of any one of the computer 2 input terminal 70C, the computer 1 input terminal 70M, and the BNC input terminal 70P is performed by a user switching operation of the input terminal described later. When a terminal is selected, the video signal input from the input terminal is output. The audio output terminal 70B is a terminal for connecting to a speaker, and outputs an audio signal input from an audio input terminal corresponding to the selected video input terminal.

  The computer 1 input terminal 70M and the computer 2 input terminal 70C are both terminals for connecting to a computer, and a video signal is input from the connected computer. The audio input terminal 70D is connected to an audio output terminal of a device connected to any one of the computer 2 input terminal 70C, the computer 1 input terminal 70M, and the BNC input terminal 70P, and an audio signal output from the device is received. Entered.

  The HDMI input terminal 70E is a terminal for connecting to an AV device or a computer that complies with the HDMI (High-Definition Multimedia Interface) standard, and an HDMI signal is input from these devices. The LAN terminal 70F is a terminal for connecting to a local area network. The USB terminal 70G is a terminal for connecting to a computer via a USB cable, and a video signal from the computer is input. The USB terminal 70H is a terminal for connecting to a digital camera, a storage, or the like, and video signals from these devices are input.

  The video 1 input terminal 70N, the video 2 input terminal 70J, and the S-video input terminal 70I are terminals for connection to a video device. The video 1 input terminal 70N and the video 2 input terminal 70 are output from the video device. The composite video signal is input, and the S-video video signal output from the video device is input to the S-video input terminal 70I. The audio input terminal 70K is connected to an audio output terminal of a device connected to any one of the video 1 input terminal 70N, the video 2 input terminal 70J, and the S-video input terminal 70I, and audio output from the device. A signal is input.

  The RS-232C terminal 70L is a terminal for connecting to a computer that controls the projector 10, and a control signal is input from the computer. The BNC input terminal 70P is a terminal for connecting to a computer or video equipment, and component video signals from the computer and video equipment are input.

  The operation panel 50 includes a power button 51 that is pressed when the power of the projector 10 is turned on or off, a menu button 52 that is pressed when the environment setting menu is displayed / terminated, a menu screen displayed on the projection image, and the like. A selection operation button 53 that is pressed when an input item is selected, an input detection button 54 that is pressed when a search operation is performed to search for an input terminal to which a video signal is input, and the like.

  In this example, when the input detection button 54 is pressed by the user (search operation is performed), the computer 1 input terminal 70M → the computer 2 input terminal 70C → the BNC input terminal 70P → the S-video input terminal 70I → video. The presence / absence of an input video signal is detected in the order of 1 input terminal 70N → video 2 input terminal 70J → HDMI input terminal 70E. The detection of the presence or absence of the input of the video signal may be determined, for example, based on whether or not the input includes a synchronization signal of the video signal. When a video input terminal to which a video signal is input is detected, a video corresponding to the video signal input from the video input terminal is projected onto a projection object such as a screen (SC), a white wall, or a white board. Is done.

  FIG. 3 is a plan view showing an operation surface of the remote controller 150. The remote controller 150 is displayed on the upper surface of the housing 158 in the power button 151 that is pressed when the power is turned on or off, the menu button 152 that is pressed when the environment setting menu is displayed / terminated, and the projected image. A selection operation button 153 that is pressed when selecting an input item from a menu screen or the like, an input detection button 154 that is pressed when searching for an input terminal to which a video signal is input, and the user is currently selected An input selection button 155 that is pressed when a switching operation is performed to switch the input terminal to another input terminal. In addition, a transmission unit 157 that outputs an operation signal for operating the projector 10 according to a button operation by the user is provided on the front surface of the remote controller 150. In this example, the power button 151, menu button 152, selection operation button 153, and input detection button 154 are the same as the power button 51, menu button 52, selection operation button 53, and input detection button 54 of the operation panel 50. Corresponding and has the same function.

  The input selection button 155 is a video signal from the computer 1/2 input selection button 155A and the BNC input terminal 70P that is pressed when selecting the input of the video signal from the computer 1 input terminal 70M or the computer 2 input terminal 70C. BNC input selection button 155B, which is pressed when selecting a video input, and HDMI input selection button 155C, video 1 input terminal 70N, or video 2 input terminal, which is pressed when selecting video signal input from the HDMI input terminal 70E. Video 1/2 input selection button 155D that is pressed when selecting the input of the video signal from 70J, and S-video input selection button that is pressed when selecting the input of the video signal from the S-video input terminal 70I It has 5 buttons of 155E. The user depresses an input selection button 155 corresponding to an input terminal different from the input terminal currently selected from these five input selection buttons 155, so that an input terminal for a video signal serving as a source of a projected video by the projector 10 is selected. Switching operation for switching can be performed.

Next, the internal configuration of the projector 10 will be described.
FIG. 4 is a functional block diagram showing the internal configuration of the projector 10. The projector 10 includes a control unit 20, an input signal processing unit 32, a frame memory 33, an audio processing unit 34, a speaker 35, an OSD (On Screen Display) processing unit 36, a confirmation image output unit 37, and a video. Processing unit 38, operation signal processing unit 43, operation panel 50, reception unit 55, video signal detection unit 62, input terminal switching unit 63, external device connection unit 70, lamp drive unit 80, lamp 81, a liquid crystal light valve 82, a projection optical system 83, a liquid crystal light valve driving unit 84, and a status indicator 90.

  The control unit 20 is connected to the lamp driving unit 80, the input signal processing unit 32, the OSD processing unit 36, the operation signal processing unit 43, the video signal detection unit 62, and the input terminal switching unit 63. The control unit 20 includes a microprocessor that can execute various arithmetic processes, a nonvolatile storage unit that can write and rewrite data, and the like. The nonvolatile storage unit includes a control program for controlling various operations of the projector 10, a menu screen for performing image quality adjustment, and an input terminal detection screen for detecting a video input terminal to which a video signal is input. In addition to storing OSD information for generating an OSD image such as a display screen for a trapezoidal distortion correction amount, various setting values of the projector 10 and the like are stored.

  The control unit 20 executes a control program or the like stored in the nonvolatile storage unit by the microprocessor to control the operation of each unit of the projector 10 and various data input from each unit connected to the control unit 20. And outputs the calculation result to each unit.

  As described above, the external device connection unit 70 includes an input terminal for inputting a video signal, an audio signal, and the like from the external device, and an output terminal for outputting the video signal and the audio signal to the external device. The video signal detection unit 62 includes a computer 1 input terminal 70M, a computer 2 input terminal 70C, a BNC input terminal 70P, an S-video input terminal 70I, a video 1 input terminal 70N, and a video 2 among the terminals of the external device connection unit 70. It is detected whether or not a video signal is input to each of the input terminals 70J and HDMI input terminal 70E.

  More specifically, the video signal detection unit 62 uses, for example, a video for an input terminal (hereinafter referred to as a “selection input terminal”) that is selected by default setting or at the previous startup when the projector 10 is started. Detects the presence or absence of signal input. The detection of the presence or absence of the input of the video signal may be determined, for example, based on whether or not the input includes a synchronization signal of the video signal.

  Further, when the user presses the input detection button 54 of the operation panel 50 or the input detection button 154 of the remote controller 150, that is, when the user performs a search operation, the video signal detection unit 62 performs the above-described input terminals. The presence or absence of video signal input in the order of computer 1 input terminal 70M → computer 2 input terminal 70C → BNC input terminal 70P → S-video input terminal 70I → video 1 input terminal 70N → video 2 input terminal 70J → HDMI input terminal 70E To detect. Note that the detection order of these input terminals is not limited to this example.

  In addition, when the user presses an input selection button 155 corresponding to an input terminal different from the currently selected input terminal among the input selection buttons 155 of the remote controller 150, that is, the user performs an input terminal switching operation. In this case, the video signal detection unit 62 detects whether or not a video signal is input to the input terminal switched by the switching operation.

  The input terminal switching unit 63 connects a specific input terminal among the input terminals of the external device connection unit 70 and the input signal processing unit 32. Further, the input terminal switching unit 63 receives the video signal from the input terminal that has not detected the input of the video signal as the input terminal connected to the input signal processing unit 32 in response to the user performing a search operation. Switch to the input terminal. Further, the input terminal switching unit 63 switches the input terminal connected to the input signal processing unit 32 to the selected input terminal in response to the user performing an input terminal switching operation.

  When the signal supplied from the input terminal is a video signal, the input signal processing unit 32 decodes the video signal and converts it into video data before compression encoding, and further converts the video data into video data of each RGB color. The data is converted and sequentially output to the video processing unit 38. In addition, when the signal supplied from the input terminal is an audio signal, the input signal processing unit 32 similarly decodes the audio signal, converts the audio signal into audio data by D / A conversion, and sends the audio signal to the audio processing unit 34. Output sequentially. A frame memory 33 is connected to the input signal processing unit 32, and the converted video data is stored in the frame memory 33 for each frame, and the video data stored in the frame memory 33 is sequentially stored at a predetermined timing. Can also be read.

  The sound processing unit 34 outputs sound from the speaker 35 based on the sound data from the input signal processing unit 32. Note that the audio processing unit 34 may include a volume amplification circuit, and in this case, a sound that is amplified in accordance with the content of the audio data may be output from the speaker 35.

  The OSD processing unit 36 receives the OSD information and information indicating which input terminal is the currently selected input terminal together with the control command from the control unit 20. Then, the OSD processing unit 36 generates image data of the OSD image based on the OSD information from the control unit 20 and information on the currently selected selection input terminal, and supplies the image data to the video processing unit 38.

  The confirmation image output unit 37 receives information on the detection result of the video signal by the video signal detection unit 62 for the current selected input terminal from the control unit 20 together with the control command. When the information received from the control unit 20 indicates that the video signal is not input to the selection input terminal, the confirmation image output unit 37 does not input the video signal to the selection input terminal. The image data of the confirmation image indicating this is generated and supplied to the video processing unit 38.

  Further, the confirmation image output unit 37 receives the information indicating that no video signal has been input to any of the input terminals during the search operation from the video signal detection unit 62. Image data of the image is generated and supplied to the video processing unit 38. The confirmation image output unit 37 also receives image data indicating that no video signal has been input to the input terminal switched by the switching operation from the video signal detection unit 62, and the image data of the confirmation image. Is generated and supplied to the video processing unit 38.

  In this example, the confirmation image output unit 37 includes a confirmation image storage unit 137 that stores the image data of the confirmation image. For example, the confirmation image storage unit stores image data of a confirmation image that is different for each type of input terminal. Stored in the unit 137. Then, the confirmation image output unit 37 supplies image data of the confirmation image corresponding to the selection input terminal to the video processing unit 38 when no video signal is input to the selection input terminal. Note that the confirmation image storage unit 137 may be provided as a storage device separate from the confirmation image output unit 37 instead of this example.

  The video processing unit 38 synthesizes the image data of the OSD image from the OSD processing unit 36 with the RGB color video data from the input signal processing unit 32 and supplies it to the liquid crystal light valve driving unit 84. Here, the video processing unit 38 may perform various types of image processing such as γ correction processing, trapezoidal correction processing, and resolution conversion processing on the video data from the input signal processing unit 32. The video processing unit 38 supplies the image data of the confirmation image from the confirmation image output unit 37 to the liquid crystal light valve driving unit 84 when no video signal is input to the selection input terminal.

  The operation signal processing unit 43 receives an operation signal input from the operation panel 50 in response to a button operation on the operation panel 50 by the user and outputs the operation signal to the control unit 20. Further, the operation signal processing unit 43 receives an operation signal transmitted in response to a button operation of the remote controller 150 by the user via the receiving unit 55 and outputs the operation signal to the control unit 20.

  The lamp driving unit 80 turns on or off the lamp 81 in accordance with a control command from the control unit 20. For example, when the lamp 81 is a high-pressure discharge lamp, the lamp driving unit 80 includes a lighting circuit that applies a starting voltage, a ballast that supplies an appropriate lamp current, and the like.

  The lamp 81 is a light source of the projector 10 and emits light upon receiving power from the lamp driving unit 80. In this example, the lamp 81 is a discharge lamp that emits light with high brightness, such as a high-pressure mercury lamp, a metal halide lamp, or a halogen lamp.

  The liquid crystal light valve drive unit 84 supplies a drive signal to the liquid crystal light valve 82 in accordance with the RGB video signals from the video processing unit 38. The liquid crystal light valve 82 is provided corresponding to each color of RGB, and each liquid crystal light valve 82 has a plurality of pixels formed in a matrix and corresponds to a drive signal from the liquid crystal light valve drive unit 84. Thus, the transmittance of each pixel is adjusted. The projection optical system 83 includes a combining optical system including a cross dichroic prism, a focus mechanism that can change the focus of incident light, and a zoom mechanism that can change the magnification of the projection light.

  Light from the lamp 81 is separated into R (red), G (green), and B (blue) light components by a color light separation optical system (not shown), and enters the liquid crystal light valve 82. The RGB color lights incident on the liquid crystal light valve 82 are intensity-modulated on a pixel-by-pixel basis when passing through the liquid crystal light valve 82, and enter the projection optical system 83 as video light of each color. The video light of each color incident on the projection optical system 83 is synthesized by the synthesis optical system of the projection optical system 83 and enlarged and projected on the screen SC by the projection lens 85. Further, the focus and magnification of the projection light from the projection lens 85 can be changed as necessary by the focus mechanism and zoom mechanism of the projection optical system 83.

  Note that the lamp driving unit 80, the lamp 81, the liquid crystal light valve 82, the projection optical system 83, the liquid crystal light valve driving unit 84, and the projection lens 85 in this example are examples of the display unit in the present invention.

  FIG. 5 shows an example of an operation flow related to the input terminal selection operation in the projector 10. In this flow, first, when any one of a startup operation, an input terminal search operation, and an input terminal switching operation is performed on the projector 10 (step S100), the operation is an input terminal search operation. In this case (step S102: YES), the video signal detection unit 62 causes the computer 1 input terminal 70M, the computer 2 input terminal 70C, the BNC input terminal 70P, the S-video input terminal 70I, the video 1 input terminal 70N, and the video 2 input terminal 70J. , And the presence or absence of video signal input for each input terminal of the HDMI input terminal 70E are sequentially detected (step S105).

  On the other hand, when the operation performed on the projector 10 is either an activation operation for activating the projector 10 or an input terminal switching operation in the activated state (step S102: NO), whether the operation is an activation operation. For example, the video signal detection unit 62 detects whether or not a video signal is input for a default setting input terminal or an input terminal selected at the previous activation (step S115). When the above operation is an input terminal switching operation, the video signal detection unit 62 detects whether or not a video signal is input for the input terminal switched by the switching operation (step S115).

  In step S105, when an input terminal to which a video signal is input is detected (step S105: YES), an image corresponding to the video signal input to the input terminal is projected on the screen (step S105). S110). If it is detected in step S115 that a video signal is input to the selected input terminal or the switched input terminal (step S115: YES), the video input to the input terminal An image corresponding to the signal is projected on the screen (step S120).

  On the other hand, if no video signal is input to any input terminal in step S105 (step S105: NO), the video signal is input to any input terminal in the confirmation image output unit 37. Image data of a confirmation image including a message indicating that there is no signal (for example, “The signal cannot be detected is the cable connected correctly?”) Is generated, and the confirmation image is projected onto the screen (step S130).

  If no video signal is input to the selected input terminal or the switched input terminal in step S115 (step S115: NO), the input terminals are, for example, the computer 2 input terminal 70C and the audio input terminal 70D. If it is, the confirmation image output unit 37 generates confirmation image data as shown in FIG. 6, and the confirmation image is projected onto the screen (step S130).

  As shown in FIG. 6, this confirmation image is displayed together with the message “signal cannot be detected” indicating that no video signal is input to the computer 2 input terminal 70C, and the user inputs the computer 2 input terminal 70C and the audio input terminal 70D. A message and an image for confirming whether the cable is not forgotten to be connected or whether the cable is erroneously connected to a terminal other than the computer 2 input terminal 70C and the audio input terminal 70D are included.

  That is, as shown in FIG. 6, the computer in the external device connection unit 70 is confirmed with a message “Is the cable connected correctly?” Confirming the connection of the cable to the computer 2 input terminal 70C and the audio input terminal 70D. The image of the vicinity of the 2 input terminal 70C and the audio input terminal 70D (image indicated by “X” in FIG. 6) and the terminal shape of the cable to be connected to each input terminal of the computer 2 input terminal 70C and the audio output terminal 70B Is displayed as a confirmation image (an image indicated by “Y” in FIG. 6).

  Note that the image of the input terminal and the image showing the terminal shape of the cable displayed as the confirmation image may be a live-action image, or may be an animation image or an image in which at least a part is designed. .

  Then, when the confirmation image is projected, for example, when the user connects a cable to the currently selected input terminal and the video signal input to the input terminal is detected by the video signal detection unit 62 ( Step S135: YES), an image corresponding to the input video signal is projected (Step S120). On the other hand, when the input of the video signal to the currently selected input terminal is not detected (step S135: NO), the confirmation image is continuously projected.

  On the other hand, when the video signal detection unit 62 detects that the input of the video signal to the selected input terminal is stopped in a state where the video is projected on the screen in the above steps S110 and S120 (step S140). 6) together with a confirmation image similar to FIG. 6, that is, a message prompting connection of a cable to an input terminal to which a video signal has been input, and an image in the vicinity of the input terminal in the external device connection unit 70 and the input terminal Image data of a confirmation image including an image showing the terminal shape of the cable to be connected is generated by the confirmation image output unit 37, and the confirmation image is projected on the screen (step S145).

  As described above, the projector 10 according to the present embodiment has a message for confirming the connection of the cable to the selected input terminal when the video signal is not input to the video input terminal (selected input terminal) selected by the user. Then, a confirmation image including an image in the vicinity of the selection input terminal in the external device connection unit 70 and an image showing the terminal shape of the cable to be connected to the selection input terminal is displayed.

  Therefore, the user can easily confirm whether or not the video signal is not input from the confirmation image to the selection input terminal is because the cable is not correctly connected to the selection input terminal. In addition, the user can easily confirm the position and terminal shape of the currently selected input terminal and the terminal shape of the cable to be connected from the confirmation image. Therefore, the user can easily confirm whether the cable is correctly connected to the selected input terminal while comparing the connection state of the external device connection unit 70 of the projector 10 and the confirmation image.

  Further, as shown in FIG. 6, in the image near the selection input terminal, the selection input terminals (computer 2 input terminal 70C and audio input terminal 70D) are highlighted with being surrounded by a frame. Since the user can easily find the position of the selected input terminal at 70, it is easy to confirm the connection. The method of highlighting the selected input terminal is not limited to this example. For example, the vicinity of the selected input terminal is highlighted, the surroundings and colors are changed, the background color is changed, or the blinking display is set. It may be highlighted by a method such as

(Modification)
In the above-described embodiment, the liquid crystal three-plate projector that modulates and projects the light from the light source by the liquid crystal light valve that is the light modulation unit is exemplified, but the present invention can also be applied to a projector that employs other methods. . Specifically, a projection system using DMD (Digital Micromirror Device), so-called DLP (Digital Light Processing) (registered trademark) system. That is, in the DLP method, light from a lamp that shines white is condensed by a lens and applied to the DMD, and when each mirror of the DMD is tilted to an on state, the light is enlarged by another lens and projected onto the screen. Therefore, the present invention can also be applied to such a projector.

  Moreover, although the projector which projects using a discharge lamp as a light source was illustrated in the embodiment mentioned above, this invention is applicable also to the projector which projects using a LED light source, a laser light source, etc. as a light source.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment.

DESCRIPTION OF SYMBOLS 10 ... Projector, 20 ... Control part, 32 ... Input signal processing part, 33 ... Frame memory, 34 ... Sound processing part, 35 ... Speaker, 36 ... OSD processing part, 37 ... Confirmation image output part, 38 ... Video processing part, DESCRIPTION OF SYMBOLS 43 ... Operation signal processing part, 50 ... Operation panel, 55 ... Reception part, 70 ... External apparatus connection part, 80 ... Lamp drive part, 81 ... Lamp, 82 ... Liquid crystal light valve, 83 ... Projection optical system, 84 ... Liquid crystal light Valve drive unit, 85 ... projection lens, 90 ... status indicator, 137 ... confirmation image storage unit, 150 ... remote controller, 157 ... transmission unit, 158 ... housing

Claims (8)

An image display device having a plurality of video signal input terminals,
A display unit for displaying an image according to the video signal input to the input terminal selected from the plurality of input terminals;
A video signal detector for detecting whether or not the video signal is input to the input terminal;
When it is detected that the video signal is not input to the selected input terminal, a confirmation image output for causing the display unit to display a confirmation image indicating that the video signal is not input to the input terminal And
An image display device comprising:   The image display apparatus according to claim 1, wherein the confirmation image output unit displays the confirmation image indicating the shape of the selected input terminal on the display unit.   The image display according to claim 1, wherein the confirmation image output unit displays the confirmation image in which the selected input terminal is highlighted with respect to the other input terminals on the display unit. apparatus.   The said confirmation image output part displays the said confirmation image which shows the terminal shape of the cable which should be connected to the said selected said input terminal on the said display part, The any one of Claim 1 to 3 characterized by the above-mentioned. The image display device described.   The image display apparatus according to claim 1, wherein the confirmation image output unit includes a confirmation image storage unit that stores the confirmation image. The video signal detection unit detects whether or not the video signal is input to each input terminal in response to a search operation for searching for the input terminal to which the video signal is input from a plurality of the input terminals. And
The said confirmation image output part displays the said confirmation image on the said display part, when it is detected that the said video signal is not input into any said input terminal. The image display device according to any one of the above. The video signal detection unit detects whether the video signal is input to another input terminal in response to a switching operation for switching the currently selected input terminal to another input terminal,
The said confirmation image output part displays the said confirmation image on the said display part, when it is detected that the said video signal is not input into the other said input terminal, The said display part is displayed. The image display device according to any one of the above. A control method for an image display device, comprising: a plurality of input terminals to which video signals are input; and a display unit that displays an image according to the video signals input to the input terminals selected from the plurality of input terminals. There,
A display step of displaying an image according to the video signal input to the input terminal selected from the plurality of input terminals on the display unit;
A video signal detection step for detecting whether or not the video signal is input to the input terminal;
When it is detected that the video signal is not input to the selected input terminal, a confirmation image output for causing the display unit to display a confirmation image indicating that the video signal is not input to the input terminal Stages,
A control method for an image display device, comprising:

Images