JP6256973B2 - Switching device, projector, switching method, and program - Google Patents

Description

  The present invention relates to a switching device, a projector, a switching method, and a program for switching an output signal to one of a plurality of input signals.

  In presentations and conferences, a plurality of participants may make presentations by displaying materials stored in their personal computers (PCs) in order on a projector. In this case, every time the presenter changes, the output signal, which is a video signal used for display by the projector, is obtained from the video signal from the PC owned by the presenter before the change from the PC owned by the presenter after the change. It is necessary to switch to the video signal.

  19 and 20 are diagrams for explaining an example of a method for switching the video signal to be output. Here, it is assumed that the output signal needs to be switched to the video signal from PC 901Y when the projector displays an image corresponding to the video signal from PC 901X.

  In the example of FIG. 19, since the projector 900 has only one input terminal for connecting to the PC, in order to switch the video signal to be output, the cable connected to the projector 900 is disconnected from the PC 901X. It is necessary to connect to PC901Y. However, it is troublesome and troublesome to insert and remove the cable in this manner.

  On the other hand, in the example of FIG. 20, since the projector 910 includes a plurality of input terminals for connecting to the PC, it is not necessary to disconnect the cable from the PC 901X in order to switch the video signal to be output.

  Specifically, the projector 910 illustrated in FIG. 20 uses, as an output signal, a video signal input to the first input terminal 911, the second input terminal 912, and the first input terminal 911 and the second input terminal 912. A switching device (not shown) for outputting, and a projection unit (not shown) for projecting an image corresponding to the output signal output from the switching device.

  When the PC 901X is connected to the first input terminal 911 and the switching device is set to output the video signal input to the first input terminal 911 as an output signal, the projector is stored in the PC 901X. Will be displayed. At this time, the PC 901Y is connected to the second input terminal 912, and a predetermined button provided on the projector 910 main body or the remote controller 950 is pressed to switch the video signal to be output, whereby the image projected on the screen S is stored in the PC 901Y. Can be switched to Thus, the video signal to be output can be switched without connecting or disconnecting the cable connected to the PC 901X.

  However, even in the above case, a troublesome operation such as pressing a button provided on the remote controller 950 is required, and a method of switching a video signal to be output more easily has been desired.

  Patent Document 1 discloses a switching device built in a television receiver to which an external device such as a game machine can be connected. This switching device has a plurality of input terminals, and outputs a video signal that is newly input among video signals input to each input terminal to the television receiver.

  In addition, when the input of the video signal used for display by the television receiver is stopped, the switching device is configured to switch the video signal input to each input terminal based on the priority set in each input terminal. Among them, the video signal input to the input terminal with the highest priority is output.

  As described above, the switching device described in Patent Document 1 can switch the video signal to be output without performing a switching operation.

JP 2001-346101 A

  In a presentation or a meeting, there is a case where a document stored in the assistant's PC or the like is temporarily displayed on the projector for the assistant to give a supplementary explanation while the presenter is presenting. In such a case, it is necessary to temporarily switch the output signal and switch back to the original video signal when the supplementary explanation ends.

  However, in the switching device described in Patent Document 1, when the input of the video signal used for display by the television receiver is stopped, the video signal is then output to the television receiver based on the priority of each input terminal. Since the video signal is determined, the original video signal is not necessarily output. In this case, the user has to manually perform a switching operation for switching the video signal to be output, which is troublesome and low in convenience for the user.

  An object of the present invention is to provide a switching device, a projector, a switching method, and a switching device capable of reducing the trouble of switching signals and improving user convenience even when switching a video signal to be temporarily output. And to provide a program.

The switching device according to the present invention comprises:
A plurality of signal input units to which video signals are input;
A signal output unit;
A connecting portion for connecting any one of the plurality of signal input portions to the signal output portion;
Whether each of the plurality of signal input units is in a connected state in which a video signal is input or in a stopped state in which a video signal is not input, and whether the video signal indicates that the image has changed A detection unit for detecting whether or not ,
A storage unit for storing a history of a signal input unit connected to the signal output unit by the connection unit;
The detection unit detects that any of the plurality of signal input units is newly connected , and the video signal input to the signal input unit connected to the signal output unit indicates When it is detected that the image has not changed, the signal input unit newly connected to the connection unit is connected to the signal output unit, and any one of the plurality of signal input units is newly connected. When the connection state is detected and the image indicated by the video signal input to the signal input unit connected to the signal output unit is detected to be changed, the connection When the signal input unit connected to the signal output unit and the signal output unit are maintained in a connected state and the signal input unit connected to the signal output unit is stopped, the signal input unit is stored in the storage unit. The signal that was stopped based on the history Comprising a switching control unit for connecting said signal input portion is connected to the signal output section in front of the force portion and the said signal output unit.

  The projector according to the present invention includes the switching device.

Further, the switching method according to the present invention includes:
Each of the plurality of signal input units to which the video signal is input detects whether it is in a connected state in which the video signal is input or is in a stopped state in which the video signal is not input , and the video signal indicates Detect if the image has changed ,
Wherein Ri Do plurality of any newly connected state of the signal input unit, and, when the image video signal that is input to the signal input unit connected to the signal output unit shown has not changed The signal input unit newly connected is connected to the signal output unit, and any one of the plurality of signal input units is newly connected to the signal input unit connected to the signal output unit. When the image indicated by the input video signal changes, the connection state between the signal input unit connected to the connection unit and the signal output unit is maintained,
Store the history of the signal input unit connected to the signal output unit in a storage unit ,
When the signal input unit connected to the signal output unit is in a stopped state, based on the history stored in the storage unit, the signal output unit before the signal input unit in the stopped state The signal input unit connected to the signal output unit is connected to the signal output unit.

The program according to the present invention is
Computer
A plurality of signal input units to which video signals are input;
A signal output unit;
A connecting portion for connecting any one of the plurality of signal input portions to the signal output portion;
Whether each of the plurality of signal input units is in a connected state in which a video signal is input or in a stopped state in which a video signal is not input, and whether the video signal indicates that the image has changed A detection unit for detecting whether or not ,
A storage unit for storing a history of a signal input unit connected to the signal output unit by the connection unit;
The detection unit detects that any of the plurality of signal input units is newly connected , and the video signal input to the signal input unit connected to the signal output unit indicates When it is detected that the image has not changed, the signal input unit newly connected to the connection unit is connected to the signal output unit, and any one of the plurality of signal input units is newly connected. When the connection state is detected and the image indicated by the video signal input to the signal input unit connected to the signal output unit is detected to be changed, the connection When the signal input unit connected to the signal output unit and the signal output unit are maintained in a connected state and the signal input unit connected to the signal output unit is stopped, the signal input unit is stored in the storage unit. The signal that was stopped based on the history A switching control unit for connecting said signal input portion is connected to the signal output section in front of the force portion and the said signal output unit, to function as a switching device comprising a.

  According to the present invention, even when it is desired to switch a video signal to be temporarily output, it is possible to reduce time and labor for switching a signal and improve user convenience.

It is a figure for demonstrating the scene where the projector 100 concerning the 1st Embodiment of this invention is used. It is a figure for demonstrating the transition of the image which the projector 100 projects. 2 is a block diagram for explaining a configuration of projector 100. FIG. It is a flowchart for demonstrating the operation | movement which the projector 100 switches an output signal. It is a figure for demonstrating the relationship between the presence or absence of the input signal of the projector, and a connection input terminal. It is a figure which shows the presence or absence of the input signal to each input terminal of the projector 100, and the connection input terminal at that time. It is a block diagram for demonstrating the structure of the projector 200 concerning the 2nd Embodiment of this invention. 5 is a flowchart for explaining an operation example of projector 200. It is a block diagram for demonstrating the structure of the projector 300 concerning the 3rd Embodiment of this invention. It is a figure for demonstrating the example of the display system using the projector. It is a block diagram for demonstrating the structure of the projector 400 concerning the 4th Embodiment of this invention. It is a block diagram for demonstrating the structure of the projector 500 concerning the 5th Embodiment of this invention. It is a block diagram for demonstrating the structure of the projector 600 concerning the 6th Embodiment of this invention. It is a block diagram for demonstrating the structure of the projector 700 concerning the 7th Embodiment of this invention. It is a figure which shows the presence or absence of the input signal to each input terminal of the projector 700, and the connection input terminal at that time. It is a figure which shows the presence or absence of the input signal to each input terminal of the projector 700, and the connection input terminal at that time. It is a block diagram for demonstrating the structure of the projector 800 concerning the 8th Embodiment of this invention. It is a figure for demonstrating the display image when switching a connection input terminal. It is a figure for demonstrating the method in which the projector 900 concerning the comparative example of this invention switches a signal source. It is a figure for demonstrating an example of the method in which the projector 910 concerning the comparative example of this invention switches a signal source.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in this specification and drawing, the description which overlaps may be abbreviate | omitted by attaching | subjecting the same code | symbol about the component which has the same function.

  FIG. 1 is a diagram for explaining a situation in which the switching device according to the first embodiment of the present invention is used.

  The switching device according to the present embodiment is included in the projector 100 shown in FIG. The projector 100 projects an image corresponding to the video signal input from the external device to the signal input unit on the screen S. Specifically, projector 100 includes a plurality of signal input units and a signal output unit, and further includes a switch that connects any one of the plurality of signal input units to the signal output unit. The signal output unit outputs the video signal input to the connected signal input unit as an output signal, and the output signal output from the signal output unit is used to display an image.

  FIG. 2 is a diagram for explaining transition of an image projected by the projector 100 in the scene of FIG.

  When a video signal indicating the material X stored in the PC 150X used by the person X is input to the projector 100, the projector 100 projects a first image 11X corresponding to the video signal onto the screen S. When the video signal indicating the material Y stored in the PC 150Y of the person Y is input to the projector 100 with the first image 11X being projected in this manner, the projector 100 outputs the video signal input from the PC 150Y. Switch to. Accordingly, the second image 11Y corresponding to the video signal input from the PC 150Y to the projector 100 is projected on the screen S.

  When the input of the video signal to the input terminal to which the PC 150Y is connected is stopped, the projector 100 returns the output signal to the video signal input to the projector 100 from the PC 150X again. As a result, the first image 11X is again projected on the screen S.

  As described above, in the present invention, for example, when a person Y gives a supplementary explanation while a person X is presenting, a video signal used for display is temporarily input from another external device. When it is desired to switch to a signal, since it is not necessary to perform a switching operation when the supplementary explanation of the person Y ends and the person X continues to present again, it is possible to reduce the trouble of switching the video signal used for display and to improve the convenience for the user. Can be improved. Hereinafter, a detailed configuration and operation of the projector 100 for realizing such a function will be described.

  FIG. 3 is a block diagram for explaining the configuration of the projector 100.

  A projector 100 illustrated in FIG. 3 includes a first input terminal 101, a second input terminal 102, a first signal detection circuit 103, a second signal detection circuit 104, a switch 105, a determination circuit 106, and a storage unit 107. And a video signal processing circuit 108.

  The first input terminal 101 is a connection interface that can be connected to an external device, and is a signal input unit that receives a video signal from the external device connected via a cable or the like. The first input terminal 101 outputs the input video signal to the first signal detection circuit 103 and the switch 105.

  The second input terminal 102 is a connection interface that can be connected to an external device, and is a signal input unit that receives a video signal from an external device connected via a cable or the like. The second input terminal 102 outputs the input video signal to the second signal detection circuit 104 and the switch 105.

  The first signal detection circuit 103 is a detection unit that detects whether the first input terminal 101 is in a connection state in which a video signal is input or is in a stop state in which no video signal is input. Specifically, the first signal detection circuit 103 detects the video signal output from the first input terminal 101 when it is received, and detects the video signal as the detection result while detecting the video signal. A detection signal indicating that 101 is in a connected state is output to the determination circuit 106. The first signal detection circuit 103 does not output a detection signal when the first input terminal 101 does not output a video signal. Thus, the fact that the first signal detection circuit 103 does not output a detection signal indicates that the first input terminal 101 is in a stopped state.

  The second signal detection circuit 104 is a detection unit that detects whether the second input terminal 102 is in a connected state or a stopped state. Specifically, the second signal detection circuit 104 detects the video signal output from the second input terminal 102 when it is received and detects the video signal as the detection result while detecting the video signal. A detection signal indicating that 102 is in a connected state is output to the determination circuit 106. The second signal detection circuit 104 does not output a detection signal when the second input terminal 102 does not output a video signal. Thus, the fact that the second signal detection circuit 104 does not output a detection signal indicates that the second input terminal 102 is in a stopped state.

  The switch 105 is a connection unit that connects either the first input terminal 101 or the second input terminal 102 to the video signal processing circuit 108. Specifically, the switch 105 receives the video signals output from the first input terminal 101 and the second input terminal 102, and connects the input terminal indicated by the switching signal input from the determination circuit 106 to the video signal processing circuit 108. To do. As a result, the switch 105 outputs the video signal output from the input terminal indicated by the switching signal to the video signal processing circuit 108. Note that when the switch 105 changes the connection input terminal, which is an input terminal connected to the video signal processing circuit 108, based on the switching signal, the switch 105 maintains the connection input terminal without changing until the next switching signal is received.

  The determination circuit 106 is a switching control unit that receives the detection signal output from the first signal detection circuit 103 or the second signal detection circuit 104 and notifies the switch 105 to switch the connection input terminal based on the received detection signal. is there. Specifically, the determination circuit 106 determines whether or not to switch the connection input terminal based on the detection signal. If it is determined that the connection input terminal is to be switched, the determination circuit 106 generates a switching signal and inputs it to the switch 105. This causes the switch 105 to switch the connection input terminal.

  More specifically, the determination circuit 106 detects that the first signal detection circuit 103 or the second signal detection circuit 104 detects that the first input terminal 101 or the second input terminal 102 is newly connected. The switch 105 is connected to the video signal processing circuit 108 and the input terminal that is newly connected. At this time, when the first signal detection circuit 103 newly starts outputting a detection signal, the determination circuit 106 detects that the first input terminal 101 is newly connected. Judge. The determination circuit 106 determines that the second signal detection circuit 104 has detected that the second input terminal 102 is newly connected when the second signal detection circuit 104 newly starts outputting a detection signal. To do. Further, when the input terminal connected to the video signal processing circuit 108 changes, the determination circuit 106 stores the input terminal in the storage unit 107 as a history of the input terminals connected to the video signal processing circuit 108.

  Then, when the input terminal connected to the video signal processing circuit 108 is in a stopped state, the determination circuit 106 causes the switch 105 to detect the input terminal in the stopped state based on the history stored in the storage unit 107. The video signal processing circuit 108 is connected to the input terminal previously connected to the video signal processing circuit 108. Thereby, the determination circuit 106 connects the input terminal selected before the input terminal in the stopped state to the video signal processing circuit 108, and the determination circuit 106 connects to the video signal processing circuit 108. The video signal input to the input terminal is output as an output signal.

  As described above, the storage unit 107 stores a history of input terminals connected to the video signal processing circuit 108.

  The video signal processing circuit 108 is a signal output unit that outputs the video signal input to the input terminal connected by the determination circuit 106. Specifically, the video signal processing circuit 108 receives the video signal input from the switch 105, performs various video signal processing on the video signal, and outputs the video signal subjected to the video signal processing as an output signal. Video signal processing performed by the video signal processing circuit 108 is, for example, video signal γ correction processing, distortion correction processing, and the like. The video signal output from the video signal processing circuit 108 is input to a display device (not shown) such as an LCD (Liquid Crystal Display), and the display device projects an image corresponding to the input video signal onto the screen. To do.

  FIG. 4 is a flowchart for explaining an operation in which projector 100 switches the output signal.

  The determination circuit 106 determines whether or not the state of the input terminal has changed (step S100). Specifically, the determination circuit 106 determines whether the first input terminal 101 and the second input terminal 102 are based on whether the first signal detection circuit 103 and the second signal detection circuit 104 are outputting detection signals. It is determined whether or not the state has changed. The determination circuit 106 determines that the state of the input terminal has changed when a new detection signal is received and when the received detection signal is no longer output.

  When the state of the input terminal changes, the determination circuit 106 further determines whether the change is a change to the connection state or a change to the stop state (step S101).

  When the input terminal changes to the connected state, the determination circuit 106 connects the newly connected input terminal to the video signal processing circuit 108 and ends this switching operation (step S102).

  On the other hand, when the input terminal changes to the stop state, the determination circuit 106 further determines whether or not the input terminal changed to the stop state is a connection input terminal connected to the video signal processing circuit 108 (step). S103).

  When the input terminal changed to the stopped state is a connection input terminal, the determination circuit 106 connects the input terminal connected to the video signal processing circuit 108 before the input terminal in the stopped state to the video signal processing circuit 108. This switching operation is ended (step S104). On the other hand, when the input terminal changed to the stop state is not the connection input terminal, the determination circuit 106 ends this switching operation.

  Note that the operation of determining whether or not the state of the input terminal has changed in step S100 is continuously performed while the projector 100 is turned on.

  FIG. 5 is a diagram for explaining the relationship between the state of the first input terminal 101 and the second input terminal 102 and a connection input terminal that is an input terminal connected to the video signal processing circuit 108.

  When both the first input terminal 101 and the second input terminal 102 are in a stopped state (first case), the determination circuit 106 may connect the video signal processing circuit 108 to any input terminal. For example, when the switch 105 is in the initial state and the input terminal to be connected to the video signal processing circuit 108 is determined, the determination circuit 106 switches the connection input terminal to the initial state. Further, the determination circuit 106 may not switch the connection input terminal, but may maintain the connection input terminal as an input terminal connected to the video signal processing circuit 108 when the determination circuit 106 previously outputs a switching signal.

  When one of the first input terminal 101 and the second input terminal 102 is in the connected state, the determination circuit 106 selects the input terminal in the connected state and connects it to the video signal processing circuit 108 as the connection input terminal. .

  For example, when the first input terminal 101 is in a connected state and the second input terminal 102 is in a stopped state (second case), since the input terminal in the connected state is only the first input terminal 101, the determination circuit 106 The first input terminal 101 is connected to the video signal processing circuit 108 in the switch 105. In this case, the first input terminal 101 is a connection input terminal.

  Further, when the first input terminal 101 is in a stopped state and the second input terminal 102 is in a connected state (third case), since the input terminal in the connected state is only the second input terminal 102, the determination circuit 106 The second input terminal 102 is connected to the video signal processing circuit 108 to the switch 105. In this case, the second input terminal 102 is a connection input terminal.

  When both the first input terminal 101 and the second input terminal 102 are in the connected state, the determination circuit 106 selects one of the input terminals that are in the connected state based on the order of the connection state. The selected input terminal is connected to the video signal processing circuit 108 as a connection input terminal. Specifically, when the first signal detection circuit 103 detects that the first input terminal 101 is newly connected, or the second signal detection circuit 104 sets the second input terminal 102 to be newly connected. When the determination circuit 106 detects that it has become, the switch 105 causes the switch 105 to connect to the video signal processing circuit 108 the input terminal from which signal input has been newly started. In this case, the input terminal from which signal input is newly started becomes the connection input terminal.

  For example, when the first input terminal 101 is in a connected state and the second input terminal 102 is in a stopped state, the second input terminal 102 is newly connected (fourth case). Causes the switch 105 to connect the second input terminal 102 to the video signal processing circuit 108. In this case, the connection input terminal is switched from the first input terminal 101 to the second input terminal 102.

  In addition, when the first input terminal 101 is in a stopped state and the second input terminal 102 is in a connected state and the first input terminal 101 is newly connected (fifth case), the determination circuit 106. Causes the switch 105 to connect the first input terminal 101 to the video signal processing circuit 108. In this case, the connection input terminal is switched from the second input terminal 102 to the first input terminal 101.

  In addition, when the input terminal connected to the video signal processing circuit 108 is in the stopped state, the determination circuit 106 causes the switch 105 to input the input terminal in the stopped state based on the history stored in the storage unit 107. The video signal processing circuit 108 and the input terminal connected to the video signal processing circuit 108 are connected.

  For example, in a situation where both the first input terminal 101 and the second input terminal 102 are connected and the connection input terminal is the second input terminal 102, the second input terminal 102 is in a stopped state (sixth Case), the input terminal connected to the video signal processing circuit 108 before the input terminal in the stopped state is the first input terminal 101. Therefore, the determination circuit 106 causes the switch 105 to connect the first input terminal 101 to the video signal processing circuit 108. In this case, the connection input terminal is switched from the second input terminal 102 to the first input terminal 101.

  Further, when both the first input terminal 101 and the second input terminal 102 are in a connected state and the connected input terminal is the first input terminal, the first input terminal 101 is in a stopped state (seventh case). ), The input terminal connected to the video signal processing circuit 108 before the input terminal in the stopped state is the second input terminal 102. Therefore, the determination circuit 106 causes the switch 105 to connect the second input terminal 102 to the video signal processing circuit 108. In this case, the connection input terminal is switched from the first input terminal 101 to the second input terminal 102.

  FIG. 6 is a diagram showing the presence / absence of a detection signal corresponding to each input terminal of projector 100 and the connection input terminal at that time. As described above, when the detection signal is ON, the corresponding input terminal is in a connected state, and when the detection signal is OFF, the corresponding input terminal is in a stopped state.

  First, at time t0, both the first input terminal 101 and the second input terminal 102 are in a stopped state. In this case, corresponding to the first case of FIG. 5, the determination circuit 106 causes the switch 105 to connect the first input terminal, which is the initial value of the connection input terminal, to the video signal processing circuit 108. However, in this case, the video signal is not input to the video signal processing circuit 108 because the first input terminal 101 is in a stopped state and no video signal is input.

  Thereafter, when the input of the video signal to the first input terminal 101 is started, the first signal detection circuit 103 detects that the first input terminal 101 is newly connected at time t1. At this time, the second input terminal 102 remains stopped. In this case, corresponding to the second case of FIG. 5, the determination circuit 106 causes the switch 105 to connect the first input terminal 101 that is newly connected to the video signal processing circuit 108. However, since the switch 105 has already connected the first input terminal 101 to the video signal processing circuit 108, the connection is maintained. As a result, the first signal which is the video signal input to the first input terminal 101 is input to the video signal processing circuit 108, and an image corresponding to the first signal is displayed.

  When the input of the video signal to the second input terminal 102 is started, the second signal detection circuit 104 detects that the second input terminal 102 is newly connected at time t2. At this time, the first input terminal 101 remains connected. In this case, it corresponds to the fourth case of FIG. 5, and the determination circuit 106 causes the switch 105 to connect the second input terminal 102 to the video signal processing circuit 108. In this case, the connection input terminal is switched from the first input terminal 101 to the second input terminal 102, and a second signal that is a video signal input to the second input terminal 102 is input to the video signal processing circuit 108. An image corresponding to the two signals is displayed.

  When the input of the video signal to the first input terminal 101 is stopped, the first signal detection circuit 103 detects that the first input terminal 101 is in a stopped state at time t3. At this time, the second input terminal 102 remains in the connected state, and the connected input terminal remains in the second input terminal. In this case, the input terminal in the stopped state corresponds to the third case of FIG. 5 instead of the connection input terminal, and the discrimination circuit 106 has the switch 105 connecting the second input terminal 102 to the video signal processing circuit 108. To maintain the state.

  When the input of the video signal to the first input terminal 101 is started again, at time t4, the first signal detection circuit 103 detects that the first input terminal 101 is again connected. At this time, the second input terminal 102 remains connected. In this case, it corresponds to the fifth case of FIG. 5, and the determination circuit 106 causes the switch 105 to connect the first input terminal 101 to the video signal processing circuit 108. In this case, the connection input terminal is switched from the second input terminal 102 to the first input terminal 101, and an image corresponding to the first signal is displayed.

  Further, when the input of the video signal to the first input terminal 101 is stopped, the first signal detection circuit 103 detects that the first input terminal 101 is in a stopped state at time t5. At this time, the second input terminal 102 remains connected. In this case, corresponding to the seventh case of FIG. 5, the input terminal in the stopped state is a connection input terminal. Connect. In this case, the connection input terminal is switched from the first input terminal 101 to the second input terminal 102, and an image corresponding to the second signal is displayed again.

  As described above, according to the first embodiment of the present invention, when any of the signal input units is newly connected, the signal input unit and the signal output unit that are newly connected are When the signal input unit connected to the signal output unit is in a stopped state, the signal input unit and the signal output unit connected to the signal output unit before the signal input unit in the stopped state are Connected.

  Thus, when the signal input unit is newly connected, the signal input unit connected to the signal output unit is caused to output the video signal input to the signal input unit in the connected state from the signal output unit. Video signal input to the signal input unit that was connected to the signal output unit before the signal input unit in the stopped state can be output from the signal output unit again. Become. Therefore, even when it is desired to switch the video signal to be temporarily output, it is possible to reduce the trouble of switching the signal and improve the convenience for the user.

  In this embodiment, when a video signal is input to the signal input unit, the signal input unit is in a connected state. When no video signal is input to the signal input unit, the signal input unit is stopped. It was decided that it was in a state. In this case, since the state of the signal input unit can be detected by detecting the input video signal, the state of the signal input unit can be easily detected.

(Second Embodiment)
FIG. 7 is a block diagram for explaining a configuration of a projector 200 according to the second embodiment of the present invention.

  7 includes a first input terminal 201, a second input terminal 202, a motion detection circuit 203, a signal detection circuit 204, a switch 205, a determination circuit 206, a storage unit 207, and a video signal. And a processing circuit 208.

  The first input terminal 201 of the projector 200 has a function equivalent to that of the first input terminal 101 of the projector 100, the second input terminal 202 has a function equivalent to that of the second input terminal 102, and a motion detection circuit. 203 has a function equivalent to the first signal detection circuit 103, and the signal detection circuit 204 has a function equivalent to the second signal detection circuit 104. The switch 205 has a function equivalent to that of the switch 105, the discrimination circuit 206 has a function equivalent to that of the discrimination circuit 106, the storage unit 207 has a function equivalent to that of the storage unit 107, and a video signal processing circuit Reference numeral 208 has a function equivalent to that of the video signal processing circuit 108. Hereinafter, differences from the projector 100 will be mainly described.

  The first input terminal 201 is a connection interface that can be connected to an external device, and is a signal input unit that receives a video signal from an external device connected via a cable or the like. The first input terminal 201 outputs the input video signal to the motion detection circuit 203 and the switch 205.

  The second input terminal 202 is a connection interface that can be connected to an external device, and is a signal input unit that receives a video signal from the external device connected via a cable or the like. The second input terminal 202 outputs the input video signal to the signal detection circuit 204 and the switch 205.

  In addition to the function of the first signal detection circuit 103 for detecting whether the first input terminal 201 is in a connected state or a stopped state, the motion detection circuit 203 has a first input terminal 201 in a connected state. In some cases, the detection unit detects a change in the image indicated by the video signal input to the first input terminal 201. Specifically, the motion detection circuit 203 detects a difference between the frames indicated by the video signal input to the first input terminal 201. When the motion detection circuit 203 detects that the first input terminal 201 is in a connected state, the motion detection circuit 203 indicates that the first input terminal 201 is in a connected state and whether or not there is a difference between frames indicated by the video signal. Is output to the discrimination circuit 206.

  The determination circuit 206 is a switching control unit that receives the detection signals output from the motion detection circuit 203 and the signal detection circuit 204 and notifies the switch 205 to switch the connection input terminal based on the received detection signals. The discriminating circuit 206 has a function equivalent to that of the discriminating circuit 106 and a function of switching the input terminal connected to the video signal processing circuit 208 by the switch 205 based on information indicating whether or not there is a difference between frames included in the detection signal Have

  Specifically, the determination circuit 206 detects that the input terminal is newly connected, and displays an image corresponding to the video signal input to the input terminal connected to the video signal processing circuit 208. If there is no change, the switch 205 switches the input terminal connected to the video signal processing circuit 208. When the image corresponding to the video signal input to the input terminal connected to the video signal processing circuit 208 has changed, the determination circuit 206 causes the switch 205 to switch the video signal even if the input of the video signal is started. The input terminal connected to the processing circuit 208 is not switched.

  For example, the PC 150X is connected to the first input terminal 201, the switch 205 connects the first input terminal 201 to the video signal processing circuit 208, and an operation corresponding to the operation on the PC 150X is performed in the image displayed by the projector 200. When a cursor or the like is displayed, the cursor position changes while the PC 150X is being operated, and the image corresponding to the video signal input to the first input terminal 201 changes. Therefore, while the PC 150X is being operated, even if the input of the video signal to the second input terminal 202 is started, the input terminal to which the switch 205 is connected to the video signal processing circuit 208 is the first input terminal 201. It cannot be switched.

  In addition, the determination circuit 206 detects that the input terminal is newly connected, and after the switch 205 switches the input terminal connected to the video signal processing circuit 208, the determination circuit 206 newly sets the connection state. If the image indicated by the video signal input to the input terminal connected to the video signal processing circuit 208 before the input terminal is changed, the switch 205 is connected to the input terminal that is newly connected. The input terminal connected to the video signal processing circuit 208 is connected to the video signal processing circuit 208.

  For example, in a state where the PC 150X is connected to the first input terminal 201 and the PC 150Y is connected to the second input terminal 202, the input terminal to which the switch 205 is connected to the video signal processing circuit 208 is connected from the first input terminal 201 to the second input. If the user operates the PC 150X within a predetermined time after switching to the terminal 202, the cursor position changes, and the image indicated by the video signal input to the first input terminal 201 that is the pre-switching input unit changes. Will do. For this reason, even if the video signal to be output is switched even though the user of the PC 150X that output the video signal used for display before switching is not desired, the PC 150X is within the predetermined time. It is possible to restore the video signal output with the intention of the user.

  FIG. 8 is a flowchart for explaining an operation example of the projector 200.

  The determination circuit 206 determines whether or not the state of the input terminal has changed (step S200). Specifically, the determination circuit 206 determines whether the states of the first input terminal 201 and the second input terminal 202 have changed based on whether or not the motion detection circuit 203 and the signal detection circuit 204 output detection signals. Judge whether or not. The determination circuit 206 determines that the state of the input terminal has changed when a new detection signal is received and when the received detection signal is no longer output.

  When the state of the input terminal changes, the determination circuit 206 further determines whether the change is a change to the connection state or a change to the stop state (step S201).

  When the input terminal changes to the connection state, the determination circuit 206 changes the image corresponding to the signal input to the connection input terminal based on information indicating the presence / absence of a difference between frames included in the detection signal. It is determined whether or not there is (step S202). Specifically, the determination circuit 206 determines that the image has not changed when there is no difference between frames for a predetermined period before the current time (for example, 1 second).

  If the image indicated by the video signal input to the connection input terminal has changed, the determination circuit 206 ends this switching operation without switching the connection input terminal.

  On the other hand, when the image indicated by the video signal input to the connection input terminal has not changed, the determination circuit 206 causes the switch 205 to connect the input terminal that is newly connected to the video signal processing circuit 208 ( Step S203).

  When the connection input terminal is switched, the determination circuit 206 causes the image indicated by the video signal input to the input terminal that was the connection input terminal before the input terminal newly connected to be within a predetermined time after switching. It is determined whether or not there is a change (step S204). In this case as well, as in step S101, the determination circuit 206 can determine that the image has not changed if the image has not changed within a predetermined period (for example, 10 seconds) before the current time.

  When the image indicated by the video signal input to the input terminal that is the connection input terminal has changed before the input terminal that has newly entered the connection state, the determination circuit 206 causes the switch 205 to newly connect the connection state. The input terminal connected to the video signal processing circuit 208 before the input terminal is connected to the video signal processing circuit 208 (step S205).

  On the other hand, when the image indicated by the video signal input to the input terminal that was the connection input terminal has not changed before the input terminal that is newly connected, the determination circuit 206 leaves the connection input terminal as it is. The process ends.

  When the input terminal is in the stopped state, the determination circuit 206 further determines whether or not the input terminal in the stopped state is a connection input terminal connected to the video signal processing circuit 208 (step S206). ).

  When the input terminal in the stopped state is a connection input terminal, the determination circuit 206 causes the switch 205 to perform video signal processing on the input terminal connected to the video signal processing circuit 208 before the input terminal in the stopped state. The circuit 208 is connected (step S207). On the other hand, when the input terminal in the stopped state is not the connection input terminal, the determination circuit 206 maintains the connection input terminal as it is and ends this switching operation.

  The determination circuit 206 determines that the connection input terminal has been determined after the predetermined time in step S204 has elapsed, and updates the history of the input terminal connected to the video signal processing circuit 208, which is stored in the storage unit 207. You may make it do.

  In addition, the operation of determining whether or not the state of the input terminal has changed in step S200 is continuously performed while the projector 100 is turned on.

  In the second embodiment of the present invention, the projector 200 may include a motion detection circuit 209 having a function equivalent to that of the motion detection circuit 203 instead of the signal detection circuit 204. In the projector 200 shown in FIG. 7, only when the connection input terminal is switched from the first input terminal 201 to the second input terminal 202, the connection input terminal can be switched based on a change in the image. When switching from the two input terminals 202 to the first input terminal 202, the connection input terminal cannot be switched based on a change in the image. On the other hand, when the projector 200 includes the motion detection circuit 209 instead of the signal detection circuit 204, even when the connection input terminal is switched from the second input terminal 202 to the first input terminal 201, the projector 200 is based on a change in image. The connection input terminal can be switched.

  When the projector 200 includes the motion detection circuit 209 instead of the signal detection circuit 204, for example, as described above, the determination circuit 206 determines that the connection input terminal has been determined after the predetermined time in step S204 has elapsed. The history of the input terminal connected to the video signal processing circuit 208 stored in the storage unit 207 is updated. Accordingly, the determination circuit 206 can grasp the current connection input terminal by using the history stored in the storage unit 207. Therefore, the determination circuit 206 can determine, based on the history, whether to perform the determination in step S202 and step S204 using the detection result of the motion detection for the video signal input to which input terminal.

  As described above, according to the second embodiment of the present invention, as in the first embodiment, even when it is desired to switch the video signal to be temporarily output, the trouble of switching the signal is reduced. It is possible to improve the convenience for the user by reducing the amount.

  Further, in this embodiment, when the signal input unit is newly connected and the image indicated by the signal input to the signal input unit connected to the signal output unit is not changed, the connection unit outputs a signal. The signal input unit connected to the output unit is switched. As a result, even when the signal input unit is newly connected, the cursor position or the like is kept while the information processing apparatus that is inputting the video signal to the signal input unit connected to the signal output unit is being operated. As the image changes, the image indicated by the video signal input to the signal input unit changes, so that the signal input unit connected to the signal output unit cannot be switched. Therefore, when the user of the information processing apparatus that is inputting the video signal currently used for displaying an image to the signal input unit does not want, the video signal used for display is displayed by operating the information processing apparatus. It becomes possible to suppress switching.

  In addition, after the signal input unit is newly connected and the signal input unit connected to the signal output unit is switched, the signal output unit is connected to the signal output unit before the newly input signal input unit within a predetermined time. When the image indicated by the video signal input to the connected signal input unit changes, the signal input unit connected to the signal output unit is restored. This is a case where the video signal to be output has been switched although the user of the information processing apparatus that is inputting the video signal currently used to display an image to the signal input unit does not want it. However, it is possible to restore the switched video signal to the original by operating the information processing apparatus.

(Third embodiment)
FIG. 9 is a block diagram for explaining a configuration of a projector 300 according to the third embodiment of the present invention.

  A projector 300 illustrated in FIG. 9 includes an input terminal 301, a signal detection circuit 303, a wireless communication unit 304, a flash ROM (Read Only Memory) 305, a memory 306, a CPU (Central Processing Unit) 307, and a drawing circuit 308. A switch 309, a determination circuit 310, a storage unit 311, a video signal processing circuit 312, and a display unit 313.

  Projectors 100 and 200 have a signal input unit that connects to an external device by wire, whereas projector 300 has a signal input unit that connects to the external device wirelessly.

  FIG. 10 is a diagram for explaining an example of a display system using the projector 300.

  Projector 300 can be connected to an external device such as PC 150X or PC 150Y by wire or wirelessly. In addition, the projector 300 includes a signal input unit that wirelessly connects to an external device, so that it can wirelessly connect to an external device that does not have a connection terminal for wired connection to the projector 300, such as the tablet terminal 51 and the smartphone 52. Can do. The projector 300 projects an image corresponding to a signal received from an external device connected wirelessly on the screen S.

  Returning to the description of FIG.

  The input terminal 301 is a connection interface that can be connected to an external device, and is a signal input unit that receives a video signal from an external device connected via a cable or the like. The input terminal 301 outputs the input video signal to the signal detection circuit 303 and the switch 309.

  The signal detection circuit 303 is a detection unit that detects whether the input terminal 301 is in a connected state or a stopped state. Specifically, the signal detection circuit 303 detects this when the video signal output from the input terminal 301 is received, and detects the video signal while the input terminal 301 is in a connected state as a detection result. A detection signal indicating the presence is generated, and the generated detection signal is output to the determination circuit 310. The signal detection circuit 303 does not output a detection signal when the input terminal 301 does not output a video signal. Thus, the fact that the signal detection circuit 303 does not output a detection signal indicates that the input terminal 301 is in a stopped state.

  The wireless communication unit 304 is a connection interface that can be connected to an external device wirelessly, and is a signal input unit that receives a signal from the external device connected wirelessly. The wireless communication unit 304 outputs the input signal to the CPU 307.

  The flash ROM 305 is a storage device that stores a program that defines the operation of the projector 300.

  The memory 306 is a storage device that stores a program that defines the operation of the CPU 307, parameters that are used when the program is executed, and the like.

  The CPU 307 is a CPU unit that controls the projector 300. Specifically, the CPU 307 implements functions such as the detection unit 3071 and the display control unit 3072 by reading a program stored in the flash ROM 305 or the memory 306 and executing the read program.

  The detection unit 3071 is a detection unit that detects whether the wireless communication unit 304 is in a connected state or a stopped state. Specifically, the detection unit 3071 detects a signal input via wireless output from the wireless communication unit 304 and detects this when detecting a video signal. A detection signal indicating that 304 is in a connected state is output to the determination circuit 310. In addition, the detection unit 3071 does not output a detection signal when the wireless communication unit 304 does not accept a video signal. Accordingly, the fact that the detection unit 3071 does not output a detection signal indicates that the wireless communication unit 304 is in a stopped state.

  The display control unit 3072 causes the display unit 313 to display an image corresponding to the video signal output from the video signal processing circuit 312.

  The drawing circuit 308 is a video signal generation unit that generates a video signal based on the signal output from the detection unit 3071. The drawing circuit 308 outputs the generated video signal to the switch 309.

  The switch 309 is a connection unit that connects either the input terminal 301 or the drawing circuit 308 to the video signal processing circuit 312. Specifically, the switch 309 receives the video signals output from the input terminal 301 and the drawing circuit 308, and connects the signal input unit indicated by the switching signal input from the determination circuit 310 to the video signal processing circuit 312. As a result, the switch 309 inputs the video signal output from the signal input unit indicated by the switching signal to the video signal processing circuit 312.

  The determination circuit 310 receives the detection signal output from the signal detection circuit 303 or the detection unit 3071, and switches a connection input unit that is a signal input unit connected to the video signal processing circuit 312 to the switch 309 based on the received detection signal. It is the switching control part which notifies as follows. Specifically, the determination circuit 310 determines whether or not to switch the connection input unit based on the detection signal. When switching the connection input unit, the determination circuit 310 generates a switch signal and inputs the switch signal to the switch 309. In step S309, the connection input unit is switched.

  More specifically, when the determination circuit 310 detects that the input terminal 301 or the wireless communication unit 304 is newly connected, the signal input unit and the video signal that are newly connected to the switch 309 are displayed. The processing circuit 312 is connected. The determination circuit 310 stores the history of the signal input unit connected to the video signal processing circuit 312 in the storage unit 311. When the signal input unit connected to the video signal processing circuit 312 is in a stopped state, the determination circuit 310 inputs the signal input in the stopped state to the switch 309 based on the history stored in the storage unit 311. The signal input unit connected to the video signal processing circuit 309 is connected to the video signal processing circuit 312 before the unit.

  As a result, the determination circuit 310 connects the video signal processing unit 312 to the video signal processing unit 312 in which the video signal input is started the latest, and the video input to the input terminal connected to the video signal processing circuit 312. The signal is output as an output signal.

  The storage unit 311 is a storage device that stores information. In this embodiment, the storage unit 311 stores the history of the signal input unit connected to the video signal processing circuit 312.

  The video signal processing circuit 312 receives the video signal input from the switch 309, performs various signal processing on the received video signal, and the display unit 313 displays an image of the video signal subjected to the signal processing. It is a signal output part which outputs as a video signal used for this. The signal processing performed by the video signal processing circuit 312 is, for example, video signal γ correction processing and distortion correction processing.

  The display unit 313 receives the video signal output from the video signal processing circuit 312 and displays an image corresponding to the received video signal.

  As described above, according to the third embodiment of the present invention, at least one of the plurality of signal input units is a radio communication unit that receives a radio signal. Accordingly, even when a signal is input via a wireless communication path or when it is desired to switch a video signal to be temporarily output, it is possible to reduce the trouble of switching the signal and to improve the convenience of the user. It becomes possible to improve the property.

(Fourth embodiment)
FIG. 11 is a block diagram for explaining a configuration of a projector 400 according to the fourth embodiment of the present invention.

  11 includes an input terminal 401, a signal detection circuit 403, a wireless communication unit 404, a flash ROM 405, a memory 406, a CPU 407, a drawing circuit 408, a switch 409, and a video signal processing circuit 412. And a display portion 413.

  The projector 400 does not have the determination circuit 310 provided in the projector 300, but the CPU 407 functions as the determination unit 4072, thereby realizing a function equivalent to the determination circuit 310.

  The input terminal 401 of the projector 400 has a function equivalent to that of the input terminal 301 of the projector 300, the signal detection circuit 403 has a function equivalent to that of the signal detection circuit 303, and the wireless communication unit 404 is a wireless communication unit 304. The flash ROM 405 has a function equivalent to that of the flash ROM 305. The memory 406 has a function equivalent to the memory 306, the CPU 407 has a function equivalent to the CPU 307 and the determination circuit 310, the drawing circuit 408 has a function equivalent to the drawing circuit 308, and the switch 409 Has the same function as the switch 309, the video signal processing circuit 412 has the same function as the video signal processing circuit 312, and the display unit 413 has the same function as the display unit 313. Hereinafter, differences from the projector 300 will be mainly described.

  The signal detection circuit 403 is a detection unit that detects whether the input terminal 401 is in a connected state or a stopped state. Specifically, the signal detection circuit 403 detects the video signal output from the input terminal 401 and detects the video signal. While the video signal is detected, the input terminal 401 is in a connected state as a detection result. A detection signal indicating this is generated, and the generated detection signal is output to the CPU 407. Further, the signal detection circuit 403 does not output a detection signal when the input terminal 401 does not output a video signal. Thus, the fact that the signal detection circuit 403 does not output a detection signal indicates that the input terminal 401 is in a stopped state.

  In addition to the function of the memory 306, the memory 406 also has a function of a storage unit 311 that stores a history of a signal input unit connected to the video signal processing circuit 412.

  The CPU 407 is a CPU unit that controls the projector 400. Specifically, the CPU 407 implements functions such as a detection unit 4071, a determination unit 4072, and a display control unit 4073 by reading a program stored in the flash ROM 405 or the memory 406 and executing the read program.

  The detection unit 4071 has a function equivalent to that of the detection unit 3071. When the detection unit 4071 detects that the wireless communication unit 404 is connected, the detection unit 4071 generates a detection signal indicating that the wireless communication unit 404 is connected, and outputs the generated detection signal to the determination unit 4072. The signal received from the wireless communication unit 404 is output to the drawing circuit 408.

  The determination unit 4072 is a switching control unit that receives the detection signal output from the signal detection circuit 403 or the detection unit 4071 and notifies the switch 409 to switch the connection input unit based on the received detection signal. The determination unit 4072 realizes a function equivalent to that of the determination circuit 310 when the CPU 407 reads a program that defines the operation of the CPU 407 and the CPU 407 executes the read program.

  As described above, according to the fourth embodiment of the present invention, the video signal to be temporarily output can be obtained even in the configuration in which the function of the determination circuit that switches the signal input unit connected to the signal output unit is realized by the CPU. Even when it is desired to switch, it is possible to reduce the trouble of switching signals and improve user convenience.

(Fifth embodiment)
FIG. 12 is a block diagram for explaining a configuration of a projector 500 according to the fifth embodiment of the present invention.

  12 includes an input terminal 501, a signal detection circuit 503, a wireless communication unit 504, a flash ROM 505, a memory 506, a CPU 507, a wireless CPU 508, a switch 509, a determination circuit 510, and a storage. A display unit 511, a video signal processing circuit 512, and a display unit 513.

  The projector 500 performs signal processing on a signal received via the radio performed by the projectors 300 and 400 by the CPU 307 or 407 by using a wireless CPU 508 different from the CPU 507.

  Note that the input terminal 501 of the projector 500 has a function equivalent to that of the input terminal 301 of the projector 300, and the signal detection circuit 503 has a function equivalent to that of the signal detection circuit 303. The wireless communication unit 504 has a function equivalent to the wireless communication unit 304, the FlashROM 505 has a function equivalent to the FlashROM 305, the memory 506 has a function equivalent to the memory 306, and the CPU 507 A function equivalent to that of the display control unit 3072 is provided. The wireless CPU 508 has functions equivalent to the detection unit 3071 and the drawing circuit 308 of the CPU 307, the switch 509 has functions equivalent to the switch 309, and the determination circuit 510 has functions equivalent to the determination circuit 310. The video signal processing circuit 512 has a function equivalent to that of the video signal processing circuit 312, and the display unit 513 has a function equivalent to that of the display unit 313. Hereinafter, differences from the projector 300 will be mainly described.

  The wireless communication unit 504 is a connection interface that can be connected to an external device, and is a signal input unit that receives a signal from the external device connected wirelessly. The wireless communication unit 504 outputs the input signal to the wireless CPU 508.

  The wireless CPU 508 generates a video signal based on a function of a detection unit that detects whether the wireless communication unit 504 is in a connected state or a stopped state, and a signal input to the wireless communication unit 504. A wireless CPU unit having a drawing circuit function. Specifically, when the video signal is included in the signal output from the wireless communication unit 504, the wireless CPU 508 generates a detection signal indicating that the wireless communication unit 504 is in a connected state, and the generated detection signal is transmitted to the CPU 507. Output to. Further, when the wireless CPU 508 generates a video signal based on the detected signal, the wireless CPU 508 outputs the generated video signal to the switch 509.

  The CPU 507 is a CPU unit that receives the detection signal output from the wireless CPU 508 and outputs the received detection signal to the determination circuit 510.

  The switch 509 is a connection unit that connects either the input terminal 501 or the wireless CPU 508 to the video signal processing circuit 512. Specifically, the switch 509 receives the video signals output from the input terminal 501 and the wireless CPU 508, and connects the signal input unit indicated by the switching signal input from the determination circuit 510 to the video signal processing circuit 512.

  The determination circuit 510 is a switching control unit that receives the detection signals output from the signal detection circuit 503 and the CPU 507 and notifies the switch 509 to switch the connection input unit based on the received detection signals. Specifically, when switching the signal input unit connected to the video signal processing circuit 512, the determination circuit 510 generates a switching signal that specifies the signal input unit connected to the video signal processing circuit 512, and the generated switching signal Is input to the switch 509.

  As described above, even in the fifth embodiment of the present invention, as in the first to fourth embodiments, even when it is desired to switch the video signal to be temporarily output, It is possible to reduce labor and improve user convenience. Further, in the present embodiment, the signal via the wireless communication path is processed by a circuit different from the control unit that controls the switching device. Thereby, it becomes possible to reduce the load of the control unit that controls the switching device.

(Sixth embodiment)
FIG. 13 is a block diagram for explaining a configuration of a projector 600 according to the sixth embodiment of the present invention.

  13 includes an input terminal 601, a signal detection circuit 603, a wireless communication unit 604, a Flash ROM 605, a memory 606, a CPU 607, a wireless CPU 608, a switch 609, a video signal processing circuit 612, and the like. And a display portion 613.

  The input terminal 601 of the projector 600 has a function equivalent to that of the input terminal 501 of the projector 500, and the signal detection circuit 603 has a function equivalent to that of the signal detection circuit 503. The wireless communication unit 604 has the same function as the wireless communication unit 504, the FlashROM 605 has the same function as the FlashROM 505, and the memory 606 has the same function as the memory 506. The CPU 607 has a function equivalent to the CPU 508 and the determination circuit 510, and the wireless CPU 608 has a function equivalent to the wireless CPU 508. The switch 609 has a function equivalent to that of the switch 509, the video signal processing circuit 612 has a function equivalent to that of the video signal processing circuit 512, and the display portion 613 has a function equivalent to that of the display portion 513. Hereinafter, differences from the projector 500 will be mainly described.

  The signal detection circuit 603 detects whether the input terminal 601 is in a connected state or in a stopped state. Specifically, the signal detection circuit 603 detects the video signal output from the input terminal 601 when it is received, and while the video signal is detected, the input terminal 601 is in a connected state as a detection result. A detection signal indicating this is generated, and the generated detection signal is output to the CPU 607. The signal detection circuit 603 does not output a detection signal when the input terminal 601 does not output a video signal. Thus, the fact that the signal detection circuit 603 does not output a detection signal indicates that the input terminal 601 is in a stopped state.

  The CPU 607 is a CPU unit that controls the projector 600. Specifically, the CPU 607 reads the program stored in the Flash ROM 605 or the memory 606 and executes the read program, thereby realizing functions such as the determination unit 6071 and the display control unit 6072.

  The determination unit 6071 is a switching control unit that receives a detection signal output from the signal detection circuit 603 or the wireless CPU 608 and notifies the switch 609 to switch the connection input unit based on the received detection signal. When switching the switch 609, the determination unit 6071 generates a switching signal indicating a signal input unit connected to the video signal processing circuit 612 and inputs the switching signal to the switch 609.

  As described above, even in the sixth embodiment of the present invention, as in the first to fifth embodiments, even when it is desired to switch the video signal to be temporarily output, It is possible to reduce labor and improve user convenience. In the present embodiment, at least one of the plurality of signal input units is a radio communication unit that receives a radio signal, and is received via a radio communication path by a separate circuit from the control unit that controls the switching device. Processed radio signals are processed. Thereby, it becomes possible to reduce the load of the control unit that controls the switching device.

(Seventh embodiment)
FIG. 14 is a block diagram for explaining a configuration of a projector 700 according to the seventh embodiment of the present invention.

  The projector 700 includes a first input terminal 701, a second input terminal 702, a third input terminal 709, a first signal detection circuit 703, a second signal detection circuit 704, and a third signal detection circuit 710. . The projector 700 includes a switch 705, a determination circuit 706, a storage unit 707, and a video signal processing circuit 708.

  The first input terminal 701 of the projector 700 has a function equivalent to that of the first input terminal 101 of the projector 100, and the second input terminal 702 has a function equivalent to that of the second input terminal 102, and the first signal detection. The circuit 703 has a function equivalent to that of the first signal detection circuit 103, and the second signal detection circuit 704 has a function equivalent to that of the second signal detection circuit 104. The switch 705 has a function equivalent to that of the switch 105, the discrimination circuit 706 has a function equivalent to that of the discrimination circuit 106, and the storage unit 707 has a function equivalent to that of the storage unit 107. The circuit 708 has a function equivalent to that of the video signal processing circuit 108. Projector 700 further includes a third input terminal 709 and a third signal detection circuit 710 in addition to a configuration having a function equivalent to that of projector 100. Hereinafter, differences from the projector 100 will be mainly described.

  The third input terminal 709 is a connection interface that can be connected to an external device, and is a signal input unit that receives a video signal input from the external device connected via a cable or the like. When receiving the video signal, the third input terminal 709 outputs the received video signal to the switch 705 and the third signal detection circuit 710.

  The third signal detection circuit 710 is a detection unit that detects whether the third input terminal 709 is in a connected state or a stopped state. Specifically, when receiving the video signal output from the third input terminal 709, the third signal detection circuit 710 detects the received video signal as a video signal input to the third input terminal 709, and While the video signal is detected, a detection signal indicating that the third input terminal 709 is in a connected state is generated as a detection result, and the generated detection signal is output to the determination circuit 706. The third signal detection circuit 710 does not output a detection signal when the third input terminal 709 does not output a video signal. Thus, the fact that the third signal detection circuit 710 does not output a detection signal indicates that the third input terminal 709 is in a stopped state.

  The switch 705 is a connection unit that connects any one of the first input terminal 701, the second input terminal 702, and the third input terminal 709 to the video signal processing circuit 708. Specifically, the switch 705 receives video signals output from the first input terminal 701, the second input terminal 702, and the third input terminal 709, and receives the input terminal indicated by the switching signal input from the determination circuit 706. The video signal processing circuit 708 is connected. As a result, the switch 705 inputs the video signal output from the input terminal indicated by the switching signal to the video signal processing circuit 708.

  The determination circuit 706 receives detection signals output from the first signal detection circuit 703, the second signal detection circuit 704, and the third signal detection circuit 710, and switches the connection input terminal to the switch 705 based on the received detection signal. It is the switching control part which directs. When switching the input terminal connected to the video signal processing circuit 708, the determination circuit 706 generates a switching signal indicating the input terminal connected to the video signal processing circuit 708 after switching, and inputs the generated switching signal to the switch 705. To do.

  Note that the operation of switching the video signal output from the determination circuit 706 is the same as that in the first embodiment described with reference to FIG.

  FIG. 15 is a diagram showing the presence / absence of a video signal to each input terminal of the projector 700 and the connection input terminal at that time.

  First, at time t <b> 10, no video signal is input to the first input terminal 701, the second input terminal 702, and the third input terminal 709. In this case, the determination circuit 706 causes the switch 705 to connect the first input terminal 701 that is the initial value of the connection input terminal to the video signal processing circuit 708. However, in this case, since no video signal is input to the first input terminal 701, no video signal is input to the video signal processing circuit 708.

  When the input of the video signal to the first input terminal 701 is started, the first signal detection circuit 703 detects that the first input terminal 701 is newly connected at time t11. At this time, the second input terminal 702 and the third input terminal 709 remain stopped. In this case, the determination circuit 706 causes the switch 705 to connect the first input terminal 701 that is newly connected to the video signal processing circuit 708. However, since the switch 705 has already connected the first input terminal 701 to the video signal processing circuit 708, the connection is maintained. As a result, an image corresponding to the first signal that is the video signal input to the first input terminal 701 is displayed.

  Thereafter, when input of a video signal to the second input terminal 702 is started, the second signal detection circuit 704 detects that the second input terminal 702 is newly connected at time t12. At this time, the third input terminal 709 remains stopped. In this case, the determination circuit 706 causes the switch 705 to connect the newly connected second input terminal 702 to the video signal processing circuit 708. Accordingly, the connection input terminal is switched from the first input terminal 701 to the second input terminal 702, and an image corresponding to the second signal which is a video signal input to the second input terminal 702 is displayed.

  When the input of the video signal to the third input terminal 709 is started, the third signal detection circuit 710 detects that the third input terminal 709 is newly connected at time t13. In this case, the determination circuit 706 causes the switch 705 to connect the third input terminal 709 that is newly connected to the video signal processing circuit 708. As a result, the connection input terminal is switched from the second input terminal 702 to the third input terminal 709, and an image corresponding to the third signal which is the video signal input to the third input terminal 709 is displayed.

  Thereafter, when the input of the video signal to the first input terminal 701 is stopped, the first signal detection circuit 703 detects that the first input terminal 701 is in a stopped state at time t14. At this time, the second input terminal 702 and the third input terminal 709 remain connected, and the connection input terminal remains the third input terminal. In this case, since the input terminal in the stopped state is not a connection input terminal, the determination circuit 706 does not switch the connection input terminal as the third input terminal 709.

  Then, when the input of the video signal to the first input terminal 701 is started again, at time t15, the first signal detection circuit 703 detects that the first input terminal 701 is newly connected. In this case, the determination circuit 706 causes the switch 705 to connect the first input terminal 701 that is newly connected to the video signal processing circuit 708. Thereby, the connection input terminal is switched from the third input terminal 709 to the first input terminal 701, and an image corresponding to the first signal is displayed.

  Thereafter, when the input of the video signal to the second input terminal 702 is stopped, the second signal detection circuit 704 detects that the second input terminal 702 has been stopped at time t16. At this time, the first input terminal 701 and the third input terminal 709 remain in the connected state, and the connection input terminal remains in the first input terminal 701. In this case, since the video signal in the stopped state is not a connection input terminal, the determination circuit 706 does not switch the connection input terminal as the first input terminal.

  When the input of the video signal to the second input terminal 702 is started again, at time t17, the second signal detection circuit 704 detects that the second input terminal 702 is newly connected. In this case, the determination circuit 706 causes the switch 705 to connect the newly connected second input terminal 702 to the video signal processing circuit 708. Thereby, the connection input terminal is switched from the first input terminal 701 to the second input terminal 702, and an image corresponding to the second signal is displayed.

  Thus, even in the projector 700 having three input terminals, when input of a video signal is newly started, this input terminal is connected to the video signal output unit 708. As a result, an image corresponding to the video signal for which input is newly started is displayed.

  FIG. 16 is a diagram for explaining another example of the operation of the projector 700.

  FIG. 16 shows the presence / absence of video signals input to the first input terminal 701, the second input terminal 702, and the third input terminal 709, and the connection input terminals at that time.

  First, at time t20, video signals input to the first input terminal 701, the second input terminal 702, and the third input terminal 709 are not detected. In this case, the determination circuit 706 causes the switch 705 to connect the first input terminal 701 that is the initial value of the connection input terminal to the video signal processing circuit 708.

  When the input of the video signal to the first input terminal 701 is started, the first signal detection circuit 703 detects that the first input terminal 701 is newly connected at time t21 and detects the detection signal. Is output. At this time, the second input terminal 702 and the third input terminal 709 remain stopped. In this case, the determination circuit 706 causes the switch 705 to connect the first input terminal 701 to the video signal processing circuit 708. However, since the switch 705 has already connected the first input terminal 701 to the video signal processing circuit 708, the connection is maintained. As a result, an image corresponding to the first signal input to the first input terminal 701 is displayed.

  After that, when the input of the video signal to the second input terminal 702 is started, at time t22, the second signal detection circuit 704 detects that the second input terminal 702 is newly connected and detects the detection signal. Is output. At this time, the third input terminal 709 remains stopped. In this case, the determination circuit 706 causes the switch 705 to connect the newly connected second input terminal 702 to the video signal processing circuit 708. Thereby, the connection input terminal is switched from the first input terminal 701 to the second input terminal 702, and an image corresponding to the second signal is displayed.

  When the input of the video signal to the third input terminal 709 is started, the third signal detection circuit 710 detects that the input of the video signal to the third input terminal 709 is started at time t23. In this case, the determination circuit 706 causes the switch 705 to connect the third input terminal 709 that is newly connected to the video signal processing circuit 708. Thereby, the connection input terminal is switched from the second input terminal 702 to the third input terminal 709, and an image corresponding to the third signal is displayed.

  When the input of the video signal to the third input terminal 709 is stopped, the third signal detection circuit 710 detects that the third input terminal 709 has been stopped at time t24. At this time, the first input terminal 701 and the second input terminal 702 remain connected. In this case, since the input terminal in the stopped state is a connection input terminal, the determination circuit 706 causes the switch 705 to connect the second input terminal 702 to the video signal processing circuit 708. As a result, the connection input terminal is switched from the third input terminal 709 to the second input terminal 702, and an image corresponding to the second signal is displayed again.

  When the input of the video signal to the second input terminal 702 is stopped, the second signal detection circuit 704 detects that the second input terminal 702 has been stopped at time t25. At this time, the first input terminal 701 remains connected. In this case, since the input terminal in the stopped state is a connection input terminal, the determination circuit 706 causes the switch 705 to connect the first input terminal 701 to the video signal processing circuit 708. Thereby, the connection input terminal is returned to the first input terminal 701 which is the connection input terminal before switching to the second input terminal 702, and an image corresponding to the first signal is displayed again.

  In FIG. 16, the second input terminal 702, which is the connection input terminal before switching the connection input terminal to the third input terminal 709, is in the connected state at time t24. However, at time t24, the second input terminal 702 is connected. Is in a stopped state, the determination circuit 706 switches the connection input terminal to the first input terminal 701 that is the connection input terminal before switching to the second input terminal 702.

  As described above, according to the seventh embodiment of the present invention, in a projector having three input terminals, even when it is desired to temporarily switch the video signal used for output processing, It is possible to improve the convenience for the user by reducing the trouble of switching.

(Eighth embodiment)
FIG. 17 is a block diagram for explaining a configuration of a projector 800 according to the eighth embodiment of the present invention.

  The projector 800 includes a first input terminal 801, a second input terminal 802, a first signal detection circuit 803, a second signal detection circuit 804, an output signal generation unit 805, a determination circuit 806, and a storage unit 807. And a video signal processing circuit 808.

  The first input terminal 801 of the projector 800 has a function equivalent to that of the first input terminal 101 of the projector 100, and the second input terminal 802 has a function equivalent to that of the second input terminal 102, and the first signal detection. The circuit 803 has a function equivalent to that of the first signal detection circuit 103, and the second signal detection circuit 804 has a function equivalent to that of the second signal detection circuit 104. Further, the output signal generation unit 805 has a function equivalent to that of the switch 805, the determination circuit 806 has a function equivalent to that of the determination circuit 106, and the storage unit 807 has a function equivalent to that of the storage unit 107. The video signal processing circuit 808 has a function equivalent to that of the video signal processing circuit 108.

  The projector 800 includes an output signal generation unit 805 instead of the switch 105 of the projector 100. In addition to the function equivalent to that of the switch 105, the output signal generation unit 805 outputs video based on the video signal input to the first input terminal 801 and the video signal input to the second input terminal 802. It has a function to generate a signal. Hereinafter, differences from the projector 100 will be mainly described.

  The output signal generation unit 805 is a connection unit that connects either the first input terminal 801 or the second output terminal to the video signal processing circuit 808. Specifically, the output signal generation unit 805 receives the video signals output from the first input terminal 801 and the second input terminal 802, respectively, and sets the input terminal indicated by the switching signal input from the determination circuit 806 as the video signal processing circuit. Connect to 808. Accordingly, the output signal generation unit 805 can output the video signal input to the input terminal connected to the video signal processing circuit 808 as an output signal.

  In addition, when the input signal connected to the video signal processing circuit 808 is switched, the output signal generation unit 805 is a video signal before switching that is a video signal output before switching and a post-switching video signal that is output after switching. A composite video signal is generated based on the video signal, and the generated composite video signal is output as an output signal.

  FIG. 18 is a diagram for explaining a display image when the connection input terminal is switched.

  When switching the video signal to be output, the output signal generation unit 805 can switch the entire display area as shown in FIG. 2 by switching the input terminal connected to the video signal processing circuit 808.

  In addition, when switching the video signal to be output, the output signal generation unit 805 may switch the image to be displayed step by step as illustrated in FIG. In this case, when the switching signal is input from the determination circuit 806, the output signal generation unit 805 superimposes the image 11Y corresponding to the post-switching video signal on a part of the display area of the image 11X corresponding to the pre-switching video signal. A composite video signal indicating an image is generated, and the output signal is switched from the pre-switching video signal to the composite video signal. The output signal generation unit 805 switches the output signal from the synthesized video signal to the post-switching video signal after a predetermined time has elapsed since the output signal was switched to the synthesized video signal. Further, the output signal generation unit 805 may gradually increase the ratio of the image 11Y corresponding to the post-switching video signal in the image indicated by the composite video signal with the passage of time within a predetermined time.

  As described above, according to the eighth embodiment of the present invention, as in the first to seventh embodiments, even when the video signal to be temporarily output is to be switched, the signal is switched. It is possible to improve the convenience for the user.

  In this embodiment, when the signal input unit connected to the signal output unit is switched, an image corresponding to the video signal output from the signal output unit is displayed before the signal input unit connected to the signal output unit is switched. An image corresponding to the video signal output from the signal output unit is superimposed and displayed on a part of the display area after the signal input unit connected to the signal output unit is switched, and a predetermined time has elapsed. The image superimposed and displayed is enlarged and displayed. As a result, the signal input unit connected to the signal output unit is switched, and it is possible to clearly indicate that the output video signal has been switched.

  While the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  For example, in the above embodiment, the input signal and the output signal are video signals, and the output device is configured to include the switching device in the projector that displays an image according to the video signal. It is not limited to. For example, the output device incorporating the switching device may be a display device other than the projector. In the above embodiment, the output process performed by the projector is a process of displaying an image according to the video signal. However, when the audio signal is superimposed on the video signal, the projector may display an image and output audio corresponding to the audio signal as output processing.

  In the above embodiment, the external device is mainly a PC and may be a smartphone or a tablet terminal, but the present invention is not limited to this example. The external device may be an information processing device such as a game device, a music playback device, a video processing device, or a navigation device. Note that the video processing device includes a camera, a recorder, a player, and the like. The external device may be a storage device such as a USB (Universal Serial Bus) memory. When the external device is a USB memory, the input terminal is a USB terminal.

  Moreover, in the said embodiment, although the eight examples of the structure of the switching apparatus were given using the 1st-8th embodiment, this invention is not limited to this example. For example, in the above embodiment, for simplicity, the switching device has two or three signal input units. However, the technology of the present invention can be applied to a switching device having four or more signal input units. is there. In the above embodiment, for simplicity, one of the two signal input units is a wireless communication unit, but the present invention is not limited to this example. For example, a switching device having three or more signal input units may have a wireless communication unit as the signal input unit. In addition, the connection unit having the configuration shown in the first to seventh embodiments can be replaced with the output signal generation unit 805 shown in the eighth embodiment. In addition, the signal detection circuit or the detection unit shown in each of the first to eighth embodiments can be configured to have a function equivalent to that of the motion detection circuit 203 described in the second embodiment.

  In the above embodiment, the configuration and function of the switching device have been described. However, a program for realizing the function of the switching device and a storage medium storing the program can be provided.

  In the above embodiment, when the detection unit detects a video signal input to the signal input unit, the signal input unit is in a connected state, and when the video signal cannot be detected, the signal input unit is in a stopped state. However, the present invention is not limited to such an example. For example, even when no video signal is actually input, if the detection unit detects that an external device that outputs a video signal is connected to the signal input unit, the signal input unit is in a connected state. Also good. In this case, the signal input unit to which no external device is connected can be assumed to be in a stopped state. The connection state is a state in which the signal input unit can accept at least the input of the video signal, and the detection unit has established the communication with the external device connected to the signal input unit that the cable has been connected. In addition, when it is detected that a video signal is actually input, the signal input unit may be in a connected state connected to an external device.

  Moreover, the history memorize | stored in the memory | storage part in the said embodiment may be the information which memorize | stored the several connection input terminal with the order which became the connection input terminal, and it is before the input terminal newly set into the connection state. It may be only information indicating the input terminal that was the connection input terminal.

100, 200, 300, 400, 500, 600, 700, 800 Projector 101 First input terminal (signal input unit)
102 Second input terminal (signal input section)
103 1st signal detection circuit (detection part)
104 Second signal detection circuit (detection unit)
105 Switch (connection part)
106 Discriminating circuit (switching control unit)
108 Video signal processing circuit (signal output unit)

Claims (10)

A plurality of signal input units to which video signals are input;
A signal output unit;
A connecting portion for connecting any one of the plurality of signal input portions to the signal output portion;
Each of said plurality of signal input unit is either a connected state a video signal is inputted, or to detect whether a stop state where the video signal is not input, further wherein the video signal has changed indicates to picture image A detection unit for detecting whether or not,
A storage unit for storing a history of a signal input unit connected to the signal output unit by the connection unit;
The detection unit detects that any of the plurality of signal input units is newly connected, and the video signal input to the signal input unit connected to the signal output unit indicates When it is detected that the image has not changed, the signal input unit newly connected to the connection unit and the signal output unit are connected, and any one of the plurality of signal input units is newly When it is detected that the connected state is detected and the image indicated by the video signal input to the signal input unit connected to the signal output unit is changed, the connection unit The signal input unit connected to the signal output unit and the signal output unit are maintained in a connected state, and when the signal input unit connected to the signal output unit is stopped, the signal input unit is stored in the storage unit. Based on the history, the signal has been stopped Switching device comprising a switching control unit for connecting said signal input portion is connected to the signal output section in front of the force portion and the said signal output unit. A plurality of signal input units to which video signals are input;
A signal output unit;
A connecting portion for connecting any one of the plurality of signal input portions to the signal output portion;
Whether each of the plurality of signal input units is in a connected state in which a video signal is input or in a stopped state in which a video signal is not input , and whether or not an image indicated by the video signal has changed A detection unit for detecting
A storage unit for storing a history of a signal input unit connected to the signal output unit by the connection unit;
When the detection unit detects that any one of the plurality of signal input units is newly connected, the signal input unit newly connected to the connection unit and the signal output unit, When the signal input unit connected to the signal output unit is in a stopped state, based on the history stored in the storage unit, before the signal input unit in the stopped state A switching control unit for connecting the signal input unit connected to the signal output unit and the signal output unit ,
After the detection unit detects the signal input unit newly connected and connects the signal input unit newly connected to the signal output unit to the signal output unit. If the image indicated by the video signal input to the signal input unit connected to the signal output unit before the signal input unit newly connected is changed within a predetermined time, the connection unit A switching device that connects the signal input unit connected to the signal output unit and the signal output unit before the signal input unit newly connected. After the detection unit detects the signal input unit newly connected and connects the signal input unit newly connected to the signal output unit to the signal output unit. If the image indicated by the video signal input to the signal input unit connected to the signal output unit before the signal input unit newly connected is changed within a predetermined time, the connection unit The switching device according to claim 1 , wherein the signal input unit connected to the signal output unit is connected to the signal output unit before the signal input unit newly connected. When the connection unit switches the signal input unit connected to the signal output unit, the video before switching is a video signal that is input to the signal input unit that the connection unit was connected to the signal output unit before switching. A composite video showing a composite image in which an image indicated by a post-switching video signal that is a video signal input to a signal input unit connected to the signal output unit by the connecting unit is superimposed on a part of the image indicated by the signal 4. The signal generation unit according to claim 1 , wherein a signal is generated and output, and the signal input unit newly connected and the signal output unit are connected to the connection unit after a predetermined time. Switching device. The detection unit indicates that a video signal is input to the signal input unit, or that an external device that outputs the video signal is connected to the signal input unit. Detecting that the video signal is not input to the signal input unit, or detecting that the external device is not connected to the signal input unit as the signal input unit is in the stopped state. The switching device according to any one of claims 1 to 4 . The switching device according to claim 1 , wherein at least one of the plurality of signal input units is a radio communication unit that receives a radio signal. A projector comprising the switching device according to any one of claims 1 to 6 . Each of the plurality of signal input unit which video signals are input, whether the connected state a video signal is inputted, or to detect whether a stop state where the video signal is not input, further wherein the video signal is to indicate images detects whether the change,
One of said plurality of signal input unit is newly connected and, if the image indicated by a picture signal inputted to the signal input unit connected to the signal output unit is not changed, a new a signal input unit connected state and connected to the signal output portion, one of said plurality of signal input unit is newly connected and the input to the signal input unit connected to the signal output portion is when you are video signal image indicated is changed to be, to maintain a connection state between said signal output unit to the connected signal input the signal output section,
Store the history of the signal input unit connected to the signal output unit in a storage unit,
When the signal input unit connected to the signal output unit is in a stopped state, based on the history stored in the storage unit, the signal output unit before the signal input unit in the stopped state A switching method of connecting the signal input unit connected to the signal output unit to the signal output unit. Computer
A plurality of signal input units to which video signals are input;
A signal output unit;
A connecting portion for connecting any one of the plurality of signal input portions to the signal output portion;
Each of said plurality of signal input unit is either a connected state a video signal is inputted, or to detect whether a stop state where the video signal is not input, further wherein the video signal has changed indicates to picture image A detection unit for detecting whether or not,
A storage unit for storing a history of a signal input unit connected to the signal output unit by the connection unit;
The detection unit detects that any of the plurality of signal input units is newly connected, and the video signal input to the signal input unit connected to the signal output unit indicates When it is detected that the image has not changed, the signal input unit newly connected to the connection unit and the signal output unit are connected, and any one of the plurality of signal input units is newly When it is detected that the connected state is detected and the image indicated by the video signal input to the signal input unit connected to the signal output unit is changed, the connection unit The signal input unit connected to the signal output unit and the signal output unit are maintained in a connected state, and when the signal input unit connected to the signal output unit is stopped, the signal input unit is stored in the storage unit. Based on the history, the signal has been stopped Program for functioning as a switching device comprising a switching control unit for connecting said signal input portion is connected to the signal output section in front of the force portion and the said signal output unit. Each of the plurality of signal input units to which the video signal is input detects whether it is in a connected state in which the video signal is input or is in a stopped state in which the video signal is not input, and the image indicated by the video signal Detect whether or not
Stores the history of the signal input connected to the signal output section in the storage unit,
When it is detected that any of the plurality of signal input units is newly connected, the signal input unit newly connected and the signal output unit are connected, and the signal output unit is connected to the signal output unit. When the connected signal input unit is in a stopped state, the signal input unit is connected to the signal output unit before the signal input unit in the stopped state based on the history stored in the storage unit After connecting the signal input unit and the signal output unit, detecting the newly connected signal input unit, connecting the newly input signal input unit and the signal output unit, and then predetermined If the image indicated by the video signal input to the signal input unit connected to the signal output unit before the signal input unit newly connected is changed within the time, the connection state is newly set. Before the signal input unit becomes to the signal output unit It is connected to the signal input unit that has been continued and the signal output unit, the switching process.

Images