WO2010073357A1 - Projector and method for power supply control - Google Patents

Projector and method for power supply control Download PDF

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Publication number
WO2010073357A1
WO2010073357A1 PCT/JP2008/073700 JP2008073700W WO2010073357A1 WO 2010073357 A1 WO2010073357 A1 WO 2010073357A1 JP 2008073700 W JP2008073700 W JP 2008073700W WO 2010073357 A1 WO2010073357 A1 WO 2010073357A1
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WIPO (PCT)
Prior art keywords
video
state
video signal
input
switch
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PCT/JP2008/073700
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French (fr)
Japanese (ja)
Inventor
博志 砂流
Original Assignee
Ｎｅｃディスプレイソリューションズ株式会社
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Priority to JP2010543692A priority Critical patent/JP5473005B2/en
Priority to PCT/JP2008/073700 priority patent/WO2010073357A1/en
Publication of WO2010073357A1 publication Critical patent/WO2010073357A1/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G09G3/002—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
    • G06F3/1438—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display using more than one graphics controller
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G09G2330/022—Power management, e.g. power saving in absence of operation, e.g. no data being entered during a predetermined time
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/18—Use of a frame buffer in a display terminal, inclusive of the display panel
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G5/006—Details of the interface to the display terminal

Definitions

  • the present invention relates to a power supply control technique for displaying an image based on a video signal from a video supply device such as a personal computer or a video deck with a projector.
  • Japanese Patent Laid-Open No. 2006-258833 (refer to FIG. 5 in particular) includes two liquid crystal projectors, and the video output terminal of one liquid crystal projector (hereinafter referred to as PJ1) is the other liquid crystal projector (hereinafter referred to as PJ2). ) Is connected to the video input terminal.
  • a personal computer is connected to the liquid crystal projector PJ1.
  • An image based on the video signal from the personal computer is displayed on one or both of the liquid crystal projectors PJ1 and PJ2.
  • a projector processing necessary to display an input video signal on the projector is performed in a video processing circuit, and a buffer for image display in which the video signal subjected to the processing is stored is provided.
  • an external output buffer for supplying the input video signal to the video output terminal as it is is provided.
  • a standby state power saving mode state in which power is supplied only to a memory or the like
  • Power is supplied.
  • two projectors PJ1 and PJ2 connected as described in JP-A-2006-258833 are permanently installed in a conference room or the like, and the user can freely use these projectors PJ1 and PJ2.
  • a form is provided. The user can project an image based on the video signal output from the personal computer on one or both of the projectors PJ1 and PJ2 by connecting his / her personal computer to the projector PJ1.
  • the projector PJ1 supplies power to the external output buffer regardless of the operating state of the projector PJ2 that is the connection destination.
  • the projector PJ1 when an image is projected only by the projector PJ1, and the projector PJ2 is in a standby state, the projector PJ1 does not need to output a video signal to the projector PJ2.
  • the projector PJ1 even when the projector PJ2 is in the standby state, power is supplied to the external output buffer, and power is consumed correspondingly. Further, even when both the projectors PJ1 and PJ2 are in the standby state, the projector PJ1 supplies power to the external output buffer, resulting in unnecessary power consumption.
  • An object of the present invention is to provide a projector and a power supply control method that can solve the above-described problems and reduce power consumption.
  • a projector of the present invention is a projector including a video output terminal and a buffer for holding a video signal output to the video output terminal, An interface for detecting an operation state of a connection destination device that performs processing using a video signal output from the buffer via the video output terminal; A control unit that controls power supply to the buffer according to an operation state of the connection destination device detected by the interface; The control unit stops power supply to the buffer when the state of the connection destination device indicates that the connection destination device is not in an activated state for processing the video signal.
  • the power control method of the present invention is a power control method for a projector including a video output terminal and a buffer for holding a video signal output to the video output terminal, An operation state of a connection destination device that performs processing using a video signal output from the buffer via the video output terminal is detected, and indicates that the state of the connection destination device is not in a state of processing the video signal. If it is, the power supply to the buffer is stopped.
  • FIG. 1 is a block diagram illustrating a configuration of a projector that is a first embodiment of the present invention.
  • FIG. 2 is a flowchart illustrating an example of an operation of power control by a control unit of the projector illustrated in FIG. 1. It is a block diagram which shows the structure of the projector which is the 2nd Embodiment of this invention. It is a flowchart which shows a series of operation
  • FIG. 1 is a block diagram showing a configuration of a projector according to the first embodiment of the present invention.
  • the projector 1 includes a video input terminal 10, a video output terminal 11, a signal input / output terminal 12, an A / D conversion unit 13, a buffer 14, and a control unit 20.
  • a drive circuit for driving the device has a well-known configuration and is omitted.
  • the video input terminal 10 is connected to a video output terminal of an external video supply device (for example, a personal computer or another projector).
  • the video signal input to the video input terminal 10 is supplied to the A / D converter 13 and also supplied to the video output terminal 11 via the buffer 14.
  • the video signal is, for example, a component video signal, and more specifically, an analog RGB signal (a signal corresponding to the three primary colors of light).
  • the A / D converter 13 A / D converts the video signal supplied from the video input terminal 10.
  • the A / D converted video signal is supplied to a video processing circuit (not shown) in the control unit 20.
  • the buffer 14 temporarily holds the video signal supplied from the video input terminal 10.
  • a control unit (CPU: Central Processing Unit) 20 controls the overall operation of the projector 1, and includes an A / D power supply unit 21, a buffer power supply unit 22, a connection destination device state detection unit 23, and a power supply.
  • a control unit 24 is included.
  • the A / D power supply unit 21 supplies power to the A / D conversion unit 13.
  • the buffer power supply unit 22 supplies power to the buffer 14.
  • the connected device state detection unit 23 is connected to a device (another projector) connected to the video output terminal 11 via the signal input / output terminal 12.
  • the connection destination device state detection unit 23 includes, for example, an interface for RS232C and an interface such as a CCD / CI (Display Data Channel Command Interface) defined by VESA (Video Electronic Standard Association).
  • the operating state (starting state etc.) of the projector is detected.
  • the detection of the operation state of the connection destination device by the connection destination device state detection unit 23 is performed at regular intervals.
  • the connection destination device state detection unit 23 supplies operation state information indicating the operation state of the connection destination device to the power supply control unit 24.
  • the activation state is a state in which the connection destination device can receive and process a video signal output from the video output terminal, and more specifically, a state in which an image based on the video signal can be projected. It is.
  • the power supply control unit 24 receives the operation state information of the connection destination device from the connection destination device state detection unit 23 at regular time intervals.
  • the power control unit 24 controls the power supply to the buffer 14 by the buffer power supply unit 22 according to the operation state of the connection destination device supplied from the connection destination device state detection unit 23.
  • FIG. 2 shows an example of the power control operation by the control unit 20.
  • connection destination device state detection unit 23 detects the operation state of the connection destination device (step S10).
  • the power supply control unit 24 determines whether or not the connection destination device is in an activated state based on the operation state detected by the connection destination device state detection unit 23 (step S11).
  • step S11 If it is determined in step S11 that the connection destination device is in the activated state, the power supply control unit 24 causes the buffer power supply unit 22 to supply power to the buffer 14 (step S12). If it is determined in step S11 that the connection destination device is not in the activated state, the power supply control unit 24 stops the power supply to the buffer 14 by the buffer power supply unit 22 (step S13).
  • FIG. 1 projects an image based on an RGB signal, but this configuration can be applied to all devices that project an image based on a video signal.
  • a composite video signal including luminance information and signal synchronization information
  • a video decoder is used instead of the A / D converter 13 and a decoder is used instead of the A / D power supply unit 21.
  • a power supply is used. Also in this case, power control is performed according to the procedure shown in FIG.
  • a video signal input to one video input terminal is used as one input
  • a video signal input to the other video input terminal is used as the other input.
  • a switch for selecting and outputting is provided.
  • such a projector is configured so that the switch maintains the state when the power is turned off when the operation state becomes a standby state when the power is turned off. For this reason, when the user connects a video supply device such as a personal computer to the projector, the input on the video input terminal side to which the video supply device is connected may not be selected by the switch. In such a case, it is necessary to perform an input switching operation so that the input on the video input terminal side to which the video supply device is connected is selected by the switch.
  • a projector equipped with two video output terminals (hereinafter referred to as PJ-A) connected to the video input terminal of another projector (hereinafter referred to as PJ-B) is permanently installed in a conference room or the like.
  • the user can connect the video supply device to the projector PJ-A and project an image based on the video signal from the video supply device on one or both of the projectors PJ-A and PJ-B.
  • the input on the video input terminal side of the projector PJ-A to which the video supply device is connected is input to the switch. If not selected, the user needs to activate the projector PJ-A and perform an input switching operation. Such an input switching operation is troublesome for the user. Further, since the projector PJ-A is once turned on for input switching, the power consumption in the projector PJ-A increases accordingly.
  • FIG. 3 is a block diagram showing the configuration of the projector according to the second embodiment of the present invention.
  • the projector according to the present embodiment includes two systems of RGB video input terminals 10a and 10b serving as video input terminals, switches 30 and 31, DDC / CI 23a and 23b constituting a connection destination device state detection unit, and a control unit 20.
  • the point which has the input switching control part 25 is different from the thing of 1st Embodiment.
  • Other configurations are basically the same as those of the first embodiment.
  • the video input terminals 10a and 10b and the video output terminal 11 can transmit and receive a command using a DDC signal in addition to transmitting and receiving a video signal.
  • the switch 30 uses the video signal input to the video input terminal 10a as one input and the video signal input to the video input terminal 10b as the other input, and selects and outputs one of these inputs.
  • the output of the switch 30 is supplied to the A / D converter 13 and the buffer 14.
  • the A / D conversion unit 13 has a function of detecting the presence / absence of a video signal from the switch 30 and supplies the detection result to the input switching control unit 25.
  • the switch 31 uses the command input to the video input terminal 10a as one input and the command input to the video input terminal 10b as the other input, and selects and outputs one of these input commands.
  • the output of the switch 31 is supplied to the DDC / CI 23a.
  • the DDC / CI 23a transmits / receives a command using the DDC signal to / from the projector connected to the video input terminals 10a and 10b.
  • the DDC / CI 23 b transmits and receives a command using the DDC signal to and from the projector connected to the video output terminal 11.
  • Detecting the operating state of the connected projector is performed by the DDC / CI 23b. Specifically, the DDC / CI 23b transmits a status acquisition request command to the projector as a connection destination through the video output terminal 11 at regular time intervals.
  • the connection destination projector has the configuration shown in FIG. 3 and that the video output terminal 11 of the request source projector is connected to the video input terminal 10a of the connection destination projector.
  • the DDC / CI 23 a receives the status acquisition request command from the request source projector through the video input terminal 10 a and the switch 31. Then, in response to the status acquisition request command, the DDC / CI 23a transmits a response command indicating the operation status of the projector to the requesting projector through the video input terminal 10a and the switch 31.
  • the DDC / CI 23b receives a response command from the connection destination projector through the video output terminal 11. Based on the received response command, it is possible to know the operating state of the connection destination projector.
  • the input switching control unit 25 switches the inputs of the switches 30 and 31 based on the detection result from the A / D conversion unit 13. Specifically, the input switching control unit 25 performs A / A in each of the first state in which one input is selected by the switch 30 and the second state in which the other input is selected by the switch 30. The detection result from the D conversion unit 13 is acquired, and based on the detection result, it is determined to which of the video input terminals 10a and 10b the video signal is input. Then, the input switching control unit 25 controls both the switches 30 and 31 so as to select the input on the video input terminal side to which the video signal is supplied. The input switching control unit 25 supplies a signal indicating the start and end of the input switching control of the switch 30 to the power supply control unit 24.
  • the power control unit 24 controls the power supply to the buffer 14 by the buffer power supply unit 22 according to the operation state of the connection destination projector supplied from the DDC / CI 23b.
  • the power control unit 24 supplies power to the A / D conversion unit 13 by the A / D power supply unit 21 and buffers it when no video signal is input to any of the video input terminals 10a and 10b. Both power supply to the buffer 14 by the power supply unit 22 is stopped.
  • FIG. 4 shows a series of operations including power supply control and input switching by the control unit 20.
  • the power supply control unit 24 determines whether or not the projector is in a standby state (step S20). If the projector is in the standby state, the DDC / CI 23b detects the operating state of the connection destination device (step S21).
  • the power control unit 24 When the connection destination device is in the activated state, the power control unit 24 is in a state where the buffer power supply unit 22 supplies power to the buffer 14 (steps S22 and S23). Thereafter, the input switching control unit 25 controls the switch 30 so that the input on the video input terminal 10a side is selected (step S24), and the A / D conversion unit 13 determines the presence / absence of the video signal from the switch 30. (Step S25).
  • step S25 If it is determined in step S25 that there is a video signal, the power supply control unit 24 is in a state where the buffer power supply unit 22 supplies power to the buffer 14 (step S28), and A / D power supply is performed. The power supply to the A / D conversion unit 13 by the unit 21 is stopped (step S29).
  • step S25 If it is determined in step S25 that there is no video signal, the input switching control unit 25 controls the switch 30 so that the input on the video input terminal 10b side is selected (step S26). Next, the A / D converter 13 detects the presence / absence of a video signal from the switch 30 (step S27).
  • step S27 If it is determined in step S27 that there is a video signal, the process proceeds to step S28.
  • the power control unit 24 stops the power supply to the buffer 14 by the buffer power supply unit 22 (step S30), and then the process proceeds to step S29. To do.
  • the power supply control unit 24 supplies power to the buffer 14 by the buffer power supply unit 22 and supplies power to the A / D conversion unit 13 by the A / D power supply unit 21.
  • the power supply is stopped (step S32).
  • step S30 the process waits for a predetermined time (step S31), and then proceeds to step S20.
  • the buffer power supply unit 22 does not supply power to the buffer 14, and accordingly, consumption is increased accordingly. Electric power can be reduced.
  • the buffer power supply unit 22 does not supply power to the buffer 14, and accordingly, power consumption is increased accordingly. Can be reduced.
  • the use form in which the video output terminal of the projector PJ-A is connected to the video input terminal of the projector PJ-B is permanently installed in a conference room or the like has the following effects. Both the projectors PJ-A and PJ-B are assumed to have the same configuration as the projector of this embodiment.
  • the projector PJ-A When an image based on the video signal from the video supply device is projected by the projector PJ-B, the input on the video input terminal side of the projector PJ-A to which the video supply device is connected is not selected by the switch 30 In this case, the projector PJ-A performs the input switching process in steps S23 to S30 in FIG. By this processing, the input on the video input terminal side to which the video supply device is connected is automatically selected by the switch 30. Therefore, the user does not need to start the projector PJ-A once and perform the input switching operation.
  • the A / D power supply unit 21 supplies power to the A / D conversion unit 13, and the user activates the projector PJ-A during the time required for the input switching process. This is extremely short compared to the time required for input switching operation. Therefore, the power consumption during the input switching process is smaller than when the user manually performs input switching.
  • the input on the video input terminal side to which the projector PJ-A is connected is switched to the projector PJ-B that is the connection destination.
  • the setting of the switch 30 in the projector PJ-B is normally performed when the user activates the projector PJ-B.
  • the control unit 20 performs steps S24 to S24 shown in FIG. You may perform the process of S27 separately.
  • FIG. 5 is a block diagram showing a configuration of a projector according to the third embodiment of the present invention.
  • the projector includes a video signal processing unit, an LED input state display unit, and a communication processing unit using RS232C, in addition to the configuration of the second embodiment.
  • the video signal processing unit includes video input terminals 40a and 40b, video output terminal 41, switch 32, video decoder 33, video buffer 34, input switching control unit 26, decoder power supply unit 27, and buffer power supply. Part 28.
  • the input state display unit includes LEDs 50 a and 50 b and an LED control unit 29.
  • the communication processing unit using RS232C includes a signal input / output terminal 43 and an RS232C interface unit 60.
  • the switch 32 has a video signal (video signal) supplied to the video input terminal 40a as one input, a video signal (video signal) supplied to the video input terminal 40b as the other input, and any one of these inputs. Select and output.
  • the output of the switch 32 is supplied to a video decoder 33 and a video buffer 34.
  • the video decoder 33 decodes the video signal from the switch 32 and has a function of detecting the presence or absence of the video signal from the switch 32. The detection result is supplied from the video decoder 33 to the input switching control unit 26.
  • the buffer 34 temporarily holds the video signal from the switch 32. The video signal output from the buffer 34 is supplied to the video output terminal 41.
  • the decoder power supply unit 27 supplies power to the video decoder 33.
  • the buffer power supply unit 28 supplies power to the buffer 34.
  • the RS232C interface unit 60 can communicate with a device connected to one of the video output terminals 11 and 41 through the signal input / output terminal 43, and detects an operation state of the device. Either the RS232C interface unit 60 or the DDC / CI 23b may be used to detect the operation state of the connection destination device.
  • the input switching control unit 26 switches the input of the switch 32 based on the detection result from the video decoder 33. Specifically, the input switching control unit 26 performs video decoders in each of the first state in which one input is selected by the switch 32 and the second state in which the other input is selected by the switch 32. The detection result from 33 is acquired, and based on the detection result, it is determined to which of the video input terminals 40a and 40b the video signal is input. The input switching control unit 26 controls the switch 32 so as to select the input on the video input terminal side to which the video signal is supplied. Further, the input switching control unit 26 supplies a signal indicating the start and end of the input switching control of the switch 32 to the power supply control unit 24.
  • the power supply control unit 24 determines whether or not the projector is in a standby state.
  • the power supply to the buffers 14 and 34 by the buffer power supply units 22 and 28 and the power supply to the A / D conversion unit 13 and the video decoder 33 are controlled. Further, in the standby state, the power supply control unit 24 stops the power supply to the A / D conversion unit 13 and the buffer 14 when no video signal is input to any of the video input terminals 10a and 10b, and the video When no video signal is input to any of the input terminals 40a and 40b, power supply to the video decoder 33 and the buffer 34 is stopped.
  • the lighting color of the LED 50a is different from the lighting color of the LED 50b.
  • the LED control unit 29 receives from the input switching control unit 25 a signal indicating to which of the video input terminals 10a and 10b the video signal (RGB) is being input.
  • the LED control unit 29 lights the LED 50a with the first lighting pattern.
  • the LED control unit 29 sets the LED 50a in a second lighting pattern different from the first lighting pattern. Light up.
  • the LED control unit 29 receives from the input switching control unit 26 a signal indicating to which of the video input terminals 40a and 40b the video signal (video) is being input.
  • the LED control unit 29 turns on the LED 50b with the third lighting pattern.
  • the LED control unit 29 sets the LED 50b with a fourth lighting pattern different from the third lighting pattern. Light up.
  • FIG. 6 shows a series of operations including power supply control and input switching by the control unit 20.
  • the power supply control unit 24 determines whether or not the projector is in a standby state (step S40). When the projector is in the standby state, the DDC / CI 23b (or the RS232C interface unit 60) detects the operation state of the connection destination device (step S41). The power supply control unit 24 determines whether or not the operation state of the connection destination device is an activated state (step S42). When the operating state is not the activated state, the power supply control unit 24 stops the power supply to the A / D conversion unit 13, the buffers 14 and 34, and the video recorder 33 (step S62).
  • step S42 when it is determined that the operation state of the connection destination device is the active state, the power supply control unit 24 determines whether the projector is connected to RGB or video input of the connection destination device. (Step S43). This determination is also made based on the operating state of the connection destination device.
  • step S43 If it is determined in step S43 that the color is RGB, the power supply control unit 24 stops the power supply to the video buffer 34 and the power supply to the A / D conversion unit 13 is performed. (Step S44).
  • the input switching control unit 25 controls the switch 30 so that the input on the video input terminal 10a side is selected (step S45).
  • the A / D conversion unit 13 determines whether or not there is a video signal from the switch 30 (step S46).
  • the power supply control unit 24 is in a state where the greedy supply to the RGB buffer 14 is performed (step S47), and further, the power supply control unit 24 supplies the signal to the A / D conversion unit 13. The power supply is stopped (step S48).
  • step S46 determines whether there is no video signal. If the determination result in step S46 is that there is no video signal, the input switching control unit 25 controls the switch 30 so that the input on the video input terminal 10b side is selected (step S49). Next, the A / D converter 13 detects the presence / absence of a video signal from the switch 30 (step S50). If there is a video signal, the process proceeds to step S47. If there is no video signal, the power supply control unit 24 stops the power supply to the RGB buffer 14 (step S51), and then proceeds to step S48.
  • step S43 If it is determined in step S43 that the video is a video, the power supply control unit 24 stops supplying power to the RGB buffer 14 and starts supplying power to the video decoder 33 (step S52). ).
  • the input switching control unit 26 controls the switch 32 so that the input on the video input terminal 40a side is selected (step S53).
  • the video decoder 33 determines whether there is a video signal from the switch 32 (step S54). If there is a video signal, the power control unit 24 is in a state where power is supplied to the video buffer 34 (step S55), and further, the power supply to the video decoder 33 is stopped (step S55). Step S56).
  • step S54 determines whether there is no video signal. If the determination result in step S54 is that there is no video signal, the input switching control unit 26 controls the switch 32 so that the input on the video input terminal 40b side is selected (step S57). Next, the video decoder 33 detects the presence / absence of a video signal from the switch 32 (step S58). If there is a video signal, the process proceeds to step S55. If there is no video signal, the power supply control unit 24 stops the power supply to the video buffer 34 (step S59), and then proceeds to step S56.
  • step S40 If it is determined in step S40 that the operation state is not the standby state, or if any of steps S48, S56, and S60 is performed, the process waits for a predetermined time (step S61), and then proceeds to step S40.
  • the A / D conversion unit 13 the buffers 14 and 34, and the video decoder 33 are processed. Therefore, the power consumption can be reduced accordingly.
  • Fig. 7 schematically shows a state in which two projectors are connected.
  • projectors PJ-A and PJ-B both have the configuration shown in FIG.
  • the video OUT and RS232C are the images shown in FIG. It corresponds to the input terminals 10a, 10b, 40a, 40b, the video output terminals 11, 41, and the signal input / output terminal 43.
  • the video output terminal 11 (RGB OUT) of the projector PJ-A is connected to the video input terminal 10a (RGB (1)) of the projector PJ-B.
  • the video output terminal 41 (video OUT) of the projector PJ-A is connected to the video input terminal 40a (video (1)) of the projector PJ-B.
  • the signal input / output terminal 43 (RS232C) of the projector PJ-A is connected to the signal input / output terminal 43 (RS232C) of the projector PJ-B.
  • the user connects the video supply device of the notebook personal computer 70 or the video deck 71 to the projector PJ-A, and displays an image based on the video signal from the video supply device on one of the projectors PJ-A and PJ-B. Or it can be projected on both.
  • the input on the video input terminal 10a side to which the personal computer 70 of the projector PJ-A is connected is selected by the switch 30. If not, the projector PJ-A performs input switching processing in steps S45 to S48 in FIG. By this processing, the input on the video input terminal 10a side to which the personal computer 70 is connected is automatically selected by the switch 30. Therefore, the user does not need to start the projector PJ-A once and perform the input switching operation.
  • the input on the video input terminal 40a side to which the video deck 71 of the projector PJ-A is connected is selected by the switch 32. If not, the projector PJ-A performs the input switching process in steps S45 to S48 in FIG. By this processing, the input on the video input terminal 40a side to which the video deck 71 is connected is automatically selected by the switch 32. Also in this case, the user does not need to start the projector PJ-A once and perform the input switching operation.
  • the LED control unit 29 turns off the LEDs 50a and 50b before step S40, and when the presence of a signal is determined in step S46, the LED control unit 29 The step of lighting the LED 50a with the first lighting pattern, and the step of lighting the LED 50b with the second lighting pattern when the presence of a signal is determined in step S49, and the step S54.
  • the LED control unit 29 turns on the LED 50b with the third lighting pattern, and when the presence of a signal is determined in step S58, the LED control unit 29 You may provide the step which makes LED50b light by a 4th lighting pattern.
  • the LEDs 50a and 50b are controlled to be lighted with the lighting pattern corresponding to the video input terminal on the input side selected by the switches 30 and 32. For this reason, the user can know which side of the video input terminals 10a and 10b is currently selected by the switch 30 based on the lighting pattern of the LED 50a. Similarly, the user can know which side of the video input terminals 40a, 40b is currently selected by the switch 32 based on the lighting pattern of the LED 50b.
  • the user can accurately connect the projectors PJ-A and PJ-B when installing the projectors PJ-A and PJ-B shown in FIG. Can be confirmed.
  • the projectors PJ-A and PJ-B are set in the standby state, and the video supply device is connected to the projector PJ-A.
  • the lighting pattern of each LED of the projectors PJ-A and PJ-B can be checked, so that the projector PJ-A and PJ-B It is possible to confirm whether or not there is an incorrect connection.
  • the LED control unit 29 may be configured to control the LEDs 50a and 50b with the lighting pattern used when the power is turned off until the video signal is input after entering the standby state.
  • the user when connecting the video supply device to the projector PJ-A in the standby state, the user selects which input is currently selected based on the lighting pattern of the LEDs 50a and 50b without starting the projector PJ-A. You can know what is being done. Therefore, the user can connect the video supply device to the currently selected video input terminal on the input side.
  • the system shown in FIG. 7 is an example of an image system using the projector of the present invention.
  • two projectors are connected, but three or more projectors may be connected in cascade.
  • When subordinately connecting more than two projectors connect the video output terminal of the first projector to the video input terminal of the second projector, and connect the video output terminal of the second projector to the third projector. To the video input terminal.
  • connection destination of the projector is not limited to the projector.
  • the connection destination of the projector may be a device that can process a video signal from the projector, for example, another image display device represented by a liquid crystal display, a CRT, or the like.
  • the projector may have a USB (Universal Serial Bus) terminal.
  • An input device such as a mouse, a semiconductor memory, or the like can be connected to the USB terminal.
  • the projector can be operated using the input device.
  • a semiconductor memory is connected to a USB terminal, information in the memory can be displayed.
  • control unit 20 may have signal detection functions of the A / D conversion unit 13 and the video decoder 33.
  • the present invention can be applied not only to projectors but also to image display devices such as liquid crystal displays and plasma displays in general.

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Abstract

A projector having a video output terminal (12) and a buffer (14) for holding a video signal outputted to the video output terminal (12) includes an interface which detects an operating state of a connection destination device that performs a process using the video signal outputted from the buffer (14) via the video output terminal (12) and a control unit (20) which controls supply of power to the buffer (14) according to the operating state of the connection destination device that the interface detects. The control unit (20) stops the supply of power to the buffer (14) when the connection destination device is not in the operating state in which the video signal can be processed.

Description

プロジェクターおよびその電源制御方法Projector and power control method thereof
　本発明は、パーソナルコンピュータやビデオデッキ等の映像供給装置からの映像信号に基づく画像をプロジェクターで表示する際の電源制御技術に関する。 The present invention relates to a power supply control technique for displaying an image based on a video signal from a video supply device such as a personal computer or a video deck with a projector.
　特開２００６－２５８８３３号公報（特に図５参照）には、２台の液晶プロジェクターを備え、一方の液晶プロジェクター（以下、ＰＪ１と記す）の映像出力端子が他方の液晶プロジェクター（以下、ＰＪ２と記す）の映像入力端子に接続されたシステムが記載されている。このシステムでは、パーソナルコンピュータが、液晶プロジェクターＰＪ１に接続される。パーソナルコンピュータからの映像信号に基づく画像が、液晶プロジェクターＰＪ１、ＰＪ２の一方または双方で表示される。 Japanese Patent Laid-Open No. 2006-258833 (refer to FIG. 5 in particular) includes two liquid crystal projectors, and the video output terminal of one liquid crystal projector (hereinafter referred to as PJ1) is the other liquid crystal projector (hereinafter referred to as PJ2). ) Is connected to the video input terminal. In this system, a personal computer is connected to the liquid crystal projector PJ1. An image based on the video signal from the personal computer is displayed on one or both of the liquid crystal projectors PJ1 and PJ2.
　一般に、プロジェクターでは、入力映像信号に対して当該プロジェクターにて表示するのに必要な処理が映像処理回路にて行われ、該処理が施された映像信号が格納される画像表示用のバッファが設けられているが、これとは別に、入力映像信号をそのまま映像出力端子に供給するための外部出力用のバッファが設けられている。このようなプロジェクターにおいては、フル稼働状態だけでなく、主電源オン、電源オフとされるスタンバイ状態（メモリ等にのみ電力が供給される省電力モード状態）においても、外部出力用のバッファへの電力供給が行われる。 In general, in a projector, processing necessary to display an input video signal on the projector is performed in a video processing circuit, and a buffer for image display in which the video signal subjected to the processing is stored is provided. However, apart from this, an external output buffer for supplying the input video signal to the video output terminal as it is is provided. In such a projector, not only in a full operation state, but also in a standby state (power saving mode state in which power is supplied only to a memory or the like) in which the main power is turned on and turned off, Power is supplied.
　ところで、特開２００６－２５８８３３号公報に記載のような接続がなされた２台のプロジェクターＰＪ１、ＰＪ２を会議室等に常設し、ユーザが、それらプロジェクターＰＪ１、ＰＪ２を自由に利用できるようにした利用形態が提供されている。ユーザは、自身のパーソナルコンピュータをプロジェクターＰＪ１に接続することで、パーソナルコンピュータから出力された映像信号に基づく画像をプロジェクターＰＪ１、ＰＪ２の一方または双方にて投射させることができる。 By the way, two projectors PJ1 and PJ2 connected as described in JP-A-2006-258833 are permanently installed in a conference room or the like, and the user can freely use these projectors PJ1 and PJ2. A form is provided. The user can project an image based on the video signal output from the personal computer on one or both of the projectors PJ1 and PJ2 by connecting his / her personal computer to the projector PJ1.
　しかし、上記の利用形態において、プロジェクターＰＪ１では、接続先であるプロジェクターＰＪ２の動作状態に関係なく、外部出力用のバッファへの電力供給が行われるため、無駄に電力が消費される場合がある。 However, in the above usage mode, the projector PJ1 supplies power to the external output buffer regardless of the operating state of the projector PJ2 that is the connection destination.
　例えば、プロジェクターＰＪ１でのみ画像を投射する場合で、プロジェクターＰＪ２がスタンバイ状態である場合は、プロジェクターＰＪ１は映像信号をプロジェクターＰＪ２へ出力する必要がない。しかし、プロジェクターＰＪ１では、プロジェクターＰＪ２がスタンバイ状態であっても、外部出力用のバッファへの電力供給が行われるようになっており、その分、無駄に電力が消費される。また、プロジェクターＰＪ１、ＰＪ２が共にスタンバイ状態である場合も、プロジェクターＰＪ１では、外部出力用のバッファへの電力供給が行われるため、無駄な電力消費が生じる。 For example, when an image is projected only by the projector PJ1, and the projector PJ2 is in a standby state, the projector PJ1 does not need to output a video signal to the projector PJ2. However, in the projector PJ1, even when the projector PJ2 is in the standby state, power is supplied to the external output buffer, and power is consumed correspondingly. Further, even when both the projectors PJ1 and PJ2 are in the standby state, the projector PJ1 supplies power to the external output buffer, resulting in unnecessary power consumption.
　本発明の目的は、上記問題を解決し、消費電力を削減することのできる、プロジェクターおよび電源制御方法を提供することにある。 An object of the present invention is to provide a projector and a power supply control method that can solve the above-described problems and reduce power consumption.
　上記目的を達成するため、本発明のプロジェクターは、映像出力端子および該映像出力端子に出力される映像信号を保持するバッファを備えたプロジェクターであって、
　前記バッファから前記映像出力端子を介して出力された映像信号を用いた処理を行う接続先装置の動作状態を検出するためのインタフェースと、
　前記インタフェースが検出した前記接続先装置の動作状態に応じて前記バッファへの電力供給を制御する制御部を有し、
　前記制御部は、前記接続先装置の状態が前記映像信号を処理する起動状態に無いことを示すものである場合には、前記バッファへの電力供給を停止する。 In order to achieve the above object, a projector of the present invention is a projector including a video output terminal and a buffer for holding a video signal output to the video output terminal,
An interface for detecting an operation state of a connection destination device that performs processing using a video signal output from the buffer via the video output terminal;
A control unit that controls power supply to the buffer according to an operation state of the connection destination device detected by the interface;
The control unit stops power supply to the buffer when the state of the connection destination device indicates that the connection destination device is not in an activated state for processing the video signal.
　また、本発明の電源制御方法は、映像出力端子および該映像出力端子に出力される映像信号を保持するバッファを備えたプロジェクターの電源制御方法であって、
　前記バッファから前記映像出力端子を介して出力された映像信号を用いた処理を行う接続先装置の動作状態を検出し、前記接続先装置の状態が前記映像信号を処理する状態に無いことを示すものである場合には、前記バッファへの電力供給を停止する。 The power control method of the present invention is a power control method for a projector including a video output terminal and a buffer for holding a video signal output to the video output terminal,
An operation state of a connection destination device that performs processing using a video signal output from the buffer via the video output terminal is detected, and indicates that the state of the connection destination device is not in a state of processing the video signal. If it is, the power supply to the buffer is stopped.
本発明の第１の実施形態であるプロジェクターの構成を示すブロック図である。1 is a block diagram illustrating a configuration of a projector that is a first embodiment of the present invention. FIG. 図１に示すプロジェクターの制御部による電源制御の動作の一例を示すフローチャートである。2 is a flowchart illustrating an example of an operation of power control by a control unit of the projector illustrated in FIG. 1. 本発明の第２の実施形態であるプロジェクターの構成を示すブロック図である。It is a block diagram which shows the structure of the projector which is the 2nd Embodiment of this invention. 図３に示すプロジェクターの制御部による電源制御および入力切替を含む一連の動作を示すフローチャートである。It is a flowchart which shows a series of operation | movement including the power supply control and input switching by the control part of the projector shown in FIG. 本発明の第３の実施形態であるプロジェクターの構成を示すブロック図である。It is a block diagram which shows the structure of the projector which is the 3rd Embodiment of this invention. 図５に示すプロジェクターの制御部による電源制御および入力切替を含む一連の動作を示すフローチャートである。6 is a flowchart showing a series of operations including power control and input switching by a control unit of the projector shown in FIG. 5. ２台のプロジェクターを接続した状態を示す模式図である。It is a schematic diagram which shows the state which connected the two projectors.
符号の説明Explanation of symbols
１　プロジェクター
１０、１１　映像入力端子
１２　信号入出力端子
１３　Ａ／Ｄ変換部
１４　バッファ
２０　制御部
２１　Ａ／Ｄ用電源供給部
２２　バッファ用電源供給部
２３　接続先装置状態検出部
２４　電源制御部 DESCRIPTION OF SYMBOLS 1 Projector 10, 11 Video input terminal 12 Signal input / output terminal 13 A / D conversion part 14 Buffer 20 Control part 21 A / D power supply part 22 Buffer power supply part 23 Connection destination apparatus state detection part 24 Power supply control part
　次に、本発明の実施形態について図面を参照して説明する。 Next, an embodiment of the present invention will be described with reference to the drawings.
（第１の実施形態）
　図１は、本発明の第１の実施形態であるプロジェクターの構成を示すブロック図である。図１を参照すると、プロジェクター１は、映像入力端子１０、映像出力端子１１、信号入出力端子１２、Ａ／Ｄ変換部１３、バッファ１４および制御部２０を有する。なお、光源からの光束で照明される表示デバイス、この表示デバイスで形成された映像信号に基づく画像をスクリーン上に投写する投写レンズ、入力信号に対して映像信号処理を行う映像信号処理回路、表示デバイスを駆動する駆動回路等は、よく知られている構成であるため、省略されている。 (First embodiment)
FIG. 1 is a block diagram showing a configuration of a projector according to the first embodiment of the present invention. Referring to FIG. 1, the projector 1 includes a video input terminal 10, a video output terminal 11, a signal input / output terminal 12, an A / D conversion unit 13, a buffer 14, and a control unit 20. A display device illuminated by a light beam from a light source, a projection lens that projects an image based on a video signal formed by the display device on a screen, a video signal processing circuit that performs video signal processing on an input signal, and a display A drive circuit for driving the device has a well-known configuration and is omitted.
　映像入力端子１０は、外部映像供給装置（例えば、パーソナルコンピュータや別のプロジェクターなど）の映像出力端子に接続される。映像入力端子１０に入力された映像信号はＡ／Ｄ変換部１３に供給されるとともに、バッファ１４を介して映像出力端子１１に供給される。映像信号は、例えば、コンポーネントビデオ信号であり、より具体的には、アナログＲＧＢ信号（光の三原色に対応する信号）である。 The video input terminal 10 is connected to a video output terminal of an external video supply device (for example, a personal computer or another projector). The video signal input to the video input terminal 10 is supplied to the A / D converter 13 and also supplied to the video output terminal 11 via the buffer 14. The video signal is, for example, a component video signal, and more specifically, an analog RGB signal (a signal corresponding to the three primary colors of light).
　Ａ／Ｄ変換部１３は、映像入力端子１０から供給される映像信号をＡ／Ｄ変換する。Ａ／Ｄ変換された映像信号は、制御部２０内の映像処理回路（不図示）に供給される。バッファ１４は、映像入力端子１０から供給される映像信号を一時的に保持する。 The A / D converter 13 A / D converts the video signal supplied from the video input terminal 10. The A / D converted video signal is supplied to a video processing circuit (not shown) in the control unit 20. The buffer 14 temporarily holds the video signal supplied from the video input terminal 10.
　制御部（ＣＰＵ：Central　Processing　Unit　）２０は、プロジェクター１全体の動作を制御するものであって、Ａ／Ｄ用電源供給部２１、バッファ用電源供給部２２、接続先装置状態検出部２３および電源制御部２４を有する。Ａ／Ｄ用電源供給部２１は、Ａ／Ｄ変換部１３に電力を供給する。バッファ用電源供給部２２は、バッファ１４に電力を供給する。 A control unit (CPU: Central Processing Unit) 20 controls the overall operation of the projector 1, and includes an A / D power supply unit 21, a buffer power supply unit 22, a connection destination device state detection unit 23, and a power supply. A control unit 24 is included. The A / D power supply unit 21 supplies power to the A / D conversion unit 13. The buffer power supply unit 22 supplies power to the buffer 14.
　接続先装置状態検出部２３は、映像出力端子１１に接続された装置（別のプロジェクター）と信号入出力端子１２を介して接続される。接続先装置状態検出部２３は、例えばＲＳ２３２Ｃ用のインタフェースや、ＶＥＳＡ(Video　Electronic　Standard　Association)により定められているＣＣＤ／ＣＩ（Display　Data　Channel　Command　Interface）等のインタフェースを備え、このインタフェースを通じて、接続先であるプロジェクターの動作状態（起動状態等）を検出する。接続先装置状態検出部２３による接続先装置の動作状態の検出は、一定時間毎に実施される。接続先装置状態検出部２３は、接続先装置の動作状態を示す動作状態情報を電源制御部２４に供給する。ここで、起動状態は、接続先装置が映像出力端子から出力される映像信号を受け付けて処理することが可能な状態、より具体的には、映像信号に基づく画像を投写することが可能な状態である。 The connected device state detection unit 23 is connected to a device (another projector) connected to the video output terminal 11 via the signal input / output terminal 12. The connection destination device state detection unit 23 includes, for example, an interface for RS232C and an interface such as a CCD / CI (Display Data Channel Command Interface) defined by VESA (Video Electronic Standard Association). The operating state (starting state etc.) of the projector is detected. The detection of the operation state of the connection destination device by the connection destination device state detection unit 23 is performed at regular intervals. The connection destination device state detection unit 23 supplies operation state information indicating the operation state of the connection destination device to the power supply control unit 24. Here, the activation state is a state in which the connection destination device can receive and process a video signal output from the video output terminal, and more specifically, a state in which an image based on the video signal can be projected. It is.
　電源制御部２４は、一定時間毎に、接続先装置状態検出部２３から接続先装置の動作状態情報を受信する。電源制御部２４は、接続先装置状態検出部２３から供給された接続先装置の動作状態に応じて、バッファ用電源供給部２２によるバッファ１４への電力供給を制御する。 The power supply control unit 24 receives the operation state information of the connection destination device from the connection destination device state detection unit 23 at regular time intervals. The power control unit 24 controls the power supply to the buffer 14 by the buffer power supply unit 22 according to the operation state of the connection destination device supplied from the connection destination device state detection unit 23.
　次に、本実施形態のプロジェクターにおける電源制御の動作を説明する。 Next, the operation of power control in the projector of this embodiment will be described.
　図２に、制御部２０による電源制御の動作の一例を示す。 FIG. 2 shows an example of the power control operation by the control unit 20.
　図２を参照すると、まず、接続先装置状態検出部２３が接続先装置の動作状態を検出する（ステップＳ１０）。次に、電源制御部２４が、接続先装置状態検出部２３にて検出した動作状態に基づいて、接続先装置が起動状態であるか否かを判定する（ステップＳ１１）。 Referring to FIG. 2, first, the connection destination device state detection unit 23 detects the operation state of the connection destination device (step S10). Next, the power supply control unit 24 determines whether or not the connection destination device is in an activated state based on the operation state detected by the connection destination device state detection unit 23 (step S11).
　ステップＳ１１で、接続先装置が起動状態であると判定した場合は、電源制御部２４は、バッファ用電源供給部２２によるバッファ１４への電源供給を行わせる（ステップＳ１２）。ステップＳ１１で、接続先装置が起動状態でないと判定した場合は、電源制御部２４は、バッファ用電源供給部２２によるバッファ１４への電源供給を停止させる（ステップＳ１３）。 If it is determined in step S11 that the connection destination device is in the activated state, the power supply control unit 24 causes the buffer power supply unit 22 to supply power to the buffer 14 (step S12). If it is determined in step S11 that the connection destination device is not in the activated state, the power supply control unit 24 stops the power supply to the buffer 14 by the buffer power supply unit 22 (step S13).
　上記の電源制御によれば、映像出力端子１１に接続されたプロジェクターが起動状態でない場合は、バッファ用電源供給部２２によるバッファ１４への電源供給は行われないので、その分、消費電力を低減することができる。 According to the power control described above, when the projector connected to the video output terminal 11 is not in the activated state, power supply to the buffer 14 is not performed by the buffer power supply unit 22, thereby reducing power consumption accordingly. can do.
　なお、図１に示した例は、ＲＧＢ信号に基づく画像を投射するものであるが、この構成は、ビデオ信号に基づく画像を投射する装置全般に適用することができる。ビデオ信号としてコンポジットビデオ信号（輝度情報や信号の同期情報を含む）を用いる場合は、Ａ／Ｄ変換部１３に代えてビデオデコーダが用いられ、Ａ／Ｄ用電源供給部２１に代えてデコーダ用電源供給部が用いられる。この場合も、図２に示した手順で電源制御が行われる。 The example shown in FIG. 1 projects an image based on an RGB signal, but this configuration can be applied to all devices that project an image based on a video signal. When a composite video signal (including luminance information and signal synchronization information) is used as the video signal, a video decoder is used instead of the A / D converter 13 and a decoder is used instead of the A / D power supply unit 21. A power supply is used. Also in this case, power control is performed according to the procedure shown in FIG.
（第２の実施形態）
　２系統の映像出力端子を備えるプロジェクターでは、一方の映像入力端子に入力された映像信号を一方の入力とし、他方の映像入力端子に入力された映像信号を他方の入力とし、これら入力のいずれかを選択して出力するスイッチが設けられる。このようなプロジェクターは、一般に、電源オフにより動作状態がスタンバイ状態になると、スイッチが電源オフ時の状態を維持するようになっている。このため、ユーザが、パーソナルコンピュータ等の映像供給装置をプロジェクターに接続した場合に、映像供給装置が接続された映像入力端子側の入力が、スイッチにて選択されていない場合がある。そのような場合は、映像供給装置が接続された映像入力端子側の入力がスイッチにて選択されるように、入力切替操作を行う必要がある。 (Second Embodiment)
In a projector having two video output terminals, a video signal input to one video input terminal is used as one input, and a video signal input to the other video input terminal is used as the other input. A switch for selecting and outputting is provided. In general, such a projector is configured so that the switch maintains the state when the power is turned off when the operation state becomes a standby state when the power is turned off. For this reason, when the user connects a video supply device such as a personal computer to the projector, the input on the video input terminal side to which the video supply device is connected may not be selected by the switch. In such a case, it is necessary to perform an input switching operation so that the input on the video input terminal side to which the video supply device is connected is selected by the switch.
　２系統の映像出力端子を備えるプロジェクター（以下、ＰＪ－Ａと記す）の映像出力端子を別のプロジェクター（以下、ＰＪ－Ｂと記す）の映像入力端子に接続したものを会議室等に常設した利用形態において、ユーザは、映像供給装置をプロジェクターＰＪ－Ａに接続して、映像供給装置からの映像信号に基づく画像をプロジェクターＰＪ－Ａ、ＰＪ－Ｂの一方または両方で投射することができる。 A projector equipped with two video output terminals (hereinafter referred to as PJ-A) connected to the video input terminal of another projector (hereinafter referred to as PJ-B) is permanently installed in a conference room or the like. In the usage mode, the user can connect the video supply device to the projector PJ-A and project an image based on the video signal from the video supply device on one or both of the projectors PJ-A and PJ-B.
　上記の利用形態において、映像供給装置からの映像信号に基づく画像をプロジェクターＰＪ－Ｂで投射する場合で、プロジェクターＰＪ－Ａの、映像供給装置が接続された映像入力端子側の入力が、スイッチにて選択されていない場合は、ユーザは、プロジェクターＰＪ－Ａを起動して入力切替操作を行う必要がある。そのような入力切替操作は、ユーザにとって煩わしい。また、入力切替のために、プロジェクターＰＪ－Ａの電源を一旦入れることになるので、その分、プロジェクターＰＪ－Ａにおける消費電力が増大する。 In the above usage mode, when an image based on the video signal from the video supply device is projected by the projector PJ-B, the input on the video input terminal side of the projector PJ-A to which the video supply device is connected is input to the switch. If not selected, the user needs to activate the projector PJ-A and perform an input switching operation. Such an input switching operation is troublesome for the user. Further, since the projector PJ-A is once turned on for input switching, the power consumption in the projector PJ-A increases accordingly.
　なお、プロジェクターＰＪ－Ａの、映像供給装置が接続された映像入力端子側の入力が、スイッチにて選択されていれば、プロジェクターＰＪ－Ａの入力切替は不要であり、上記のプロジェクターＰＪ－Ａにおける消費電力の増大の問題は生じない。 If the input on the video input terminal side of the projector PJ-A to which the video supply device is connected is selected by the switch, it is not necessary to switch the input of the projector PJ-A, and the projector PJ-A There is no problem of increase in power consumption.
　以下では、入力切替を不要とし、消費電力の増大を抑制することが可能なプロジェクターを説明する。 Below, a projector that does not require input switching and can suppress an increase in power consumption will be described.
　図３は、本発明の第２の実施形態であるプロジェクターの構成を示すブロック図である。 FIG. 3 is a block diagram showing the configuration of the projector according to the second embodiment of the present invention.
　本実施形態のプロジェクターは、映像入力端子としての２系統のＲＧＢ用の映像入力端子１０ａ、１０ｂと、スイッチ３０、３１、接続先装置状態検出部を構成するＤＤＣ／ＣＩ２３ａ、２３ｂ、および制御部２０内の入力切替制御部２５を有する点が、第１の実施形態のものと異なる。他の構成は、基本的に第１の実施形態のものと同じである。 The projector according to the present embodiment includes two systems of RGB video input terminals 10a and 10b serving as video input terminals, switches 30 and 31, DDC / CI 23a and 23b constituting a connection destination device state detection unit, and a control unit 20. The point which has the input switching control part 25 is different from the thing of 1st Embodiment. Other configurations are basically the same as those of the first embodiment.
　映像入力端子１０ａ、１０ｂおよび映像出力端子１１は、映像信号の送受信に加えて、ＤＤＣ信号を用いたコマンドの送受信が可能である。 The video input terminals 10a and 10b and the video output terminal 11 can transmit and receive a command using a DDC signal in addition to transmitting and receiving a video signal.
　スイッチ３０は、映像入力端子１０ａに入力される映像信号を一方の入力とし、映像入力端子１０ｂに入力される映像信号を他方の入力とし、これら入力のいずれかを選択して出力する。スイッチ３０の出力は、Ａ／Ｄ変換部１３およびバッファ１４に供給される。Ａ／Ｄ変換部１３は、スイッチ３０からの映像信号の有無を検出する機能を有し、この検出結果を入力切替制御部２５に供給する。 The switch 30 uses the video signal input to the video input terminal 10a as one input and the video signal input to the video input terminal 10b as the other input, and selects and outputs one of these inputs. The output of the switch 30 is supplied to the A / D converter 13 and the buffer 14. The A / D conversion unit 13 has a function of detecting the presence / absence of a video signal from the switch 30 and supplies the detection result to the input switching control unit 25.
　スイッチ３１は、映像入力端子１０ａに入力されるコマンドを一方の入力とし、映像入力端子１０ｂに入力されるコマンドを他方の入力とし、これら入力コマンドのいずれかを選択して出力する。スイッチ３１の出力は、ＤＤＣ／ＣＩ２３ａに供給される。ＤＤＣ／ＣＩ２３ａは、映像入力端子１０ａ、１０ｂに接続されたプロジェクターとの間で、ＤＤＣ信号を用いたコマンドを送受信する。ＤＤＣ／ＣＩ２３ｂは、映像出力端子１１に接続されたプロジェクターとの間で、ＤＤＣ信号を用いたコマンドを送受信する。 The switch 31 uses the command input to the video input terminal 10a as one input and the command input to the video input terminal 10b as the other input, and selects and outputs one of these input commands. The output of the switch 31 is supplied to the DDC / CI 23a. The DDC / CI 23a transmits / receives a command using the DDC signal to / from the projector connected to the video input terminals 10a and 10b. The DDC / CI 23 b transmits and receives a command using the DDC signal to and from the projector connected to the video output terminal 11.
　接続先のプロジェクターの動作状態の検出は、ＤＤＣ／ＣＩ２３ｂによって行われる。具体的には、ＤＤＣ／ＣＩ２３ｂは、一定時間毎に、状態取得要求コマンドを、映像出力端子１１を通じて接続先であるプロジェクターに送信する。ここで、接続先のプロジェクターは図３に示した構成を有し、要求元のプロジェクターの映像出力端子１１が接続先のプロジェクターの映像入力端子１０ａに接続されているものと仮定する。 Detecting the operating state of the connected projector is performed by the DDC / CI 23b. Specifically, the DDC / CI 23b transmits a status acquisition request command to the projector as a connection destination through the video output terminal 11 at regular time intervals. Here, it is assumed that the connection destination projector has the configuration shown in FIG. 3 and that the video output terminal 11 of the request source projector is connected to the video input terminal 10a of the connection destination projector.
　接続先のプロジェクターでは、ＤＤＣ／ＣＩ２３ａが、映像入力端子１０ａおよびスイッチ３１を通じて、要求元のプロジェクターからの状態取得要求コマンドを受信する。そして、ＤＤＣ／ＣＩ２３ａが、その状態取得要求コマンドに応じて、自プロジェクターの動作状態を示す応答コマンドを、映像入力端子１０ａおよびスイッチ３１を通じて、要求元のプロジェクターに送信する。 In the connection destination projector, the DDC / CI 23 a receives the status acquisition request command from the request source projector through the video input terminal 10 a and the switch 31. Then, in response to the status acquisition request command, the DDC / CI 23a transmits a response command indicating the operation status of the projector to the requesting projector through the video input terminal 10a and the switch 31.
　要求元のプロジェクターでは、ＤＤＣ／ＣＩ２３ｂが、映像出力端子１１を通じて、接続先のプロジェクターからの応答コマンドを受信する。この受信した応答コマンドに基づいて、接続先のプロジェクターの動作状態を知ることができる。 In the request source projector, the DDC / CI 23b receives a response command from the connection destination projector through the video output terminal 11. Based on the received response command, it is possible to know the operating state of the connection destination projector.
　再び、図３を参照する。入力切替制御部２５は、Ａ／Ｄ変換部１３からの検出結果に基づいてスイッチ３０、３１の入力を切り替える。具体的には、入力切替制御部２５は、スイッチ３０にて一方の入力が選択された第１の状態とスイッチ３０にて他方の入力が選択された第２の状態とのそれぞれにおいて、Ａ／Ｄ変換部１３からの検出結果を取得し、その検出結果に基づいて、映像入力端子１０ａ、１０ｂのどちらに映像信号が入力されているかを判定する。そして、入力切替制御部２５は、映像信号が供給されている映像入力端子側の入力を選択するようにスイッチ３０、３１をともに制御する。また、入力切替制御部２５は、スイッチ３０の入力切替制御の開始および終了を示す信号を電源制御部２４に供給する。 Refer again to FIG. The input switching control unit 25 switches the inputs of the switches 30 and 31 based on the detection result from the A / D conversion unit 13. Specifically, the input switching control unit 25 performs A / A in each of the first state in which one input is selected by the switch 30 and the second state in which the other input is selected by the switch 30. The detection result from the D conversion unit 13 is acquired, and based on the detection result, it is determined to which of the video input terminals 10a and 10b the video signal is input. Then, the input switching control unit 25 controls both the switches 30 and 31 so as to select the input on the video input terminal side to which the video signal is supplied. The input switching control unit 25 supplies a signal indicating the start and end of the input switching control of the switch 30 to the power supply control unit 24.
　電源制御部２４は、スタンバイ状態において、ＤＤＣ／ＣＩ２３ｂから供給された接続先のプロジェクターの動作状態に応じて、バッファ用電源供給部２２によるバッファ１４への電力供給を制御する。また、電源制御部２４は、映像入力端子１０ａ、１０ｂのいずれにも映像信号が入力されていない場合に、Ａ／Ｄ用電源供給部２１によるＡ／Ｄ変換部１３への電源供給およびバッファ用電源供給部２２によるバッファ１４への電力供給をともに停止させる。 In the standby state, the power control unit 24 controls the power supply to the buffer 14 by the buffer power supply unit 22 according to the operation state of the connection destination projector supplied from the DDC / CI 23b. The power control unit 24 supplies power to the A / D conversion unit 13 by the A / D power supply unit 21 and buffers it when no video signal is input to any of the video input terminals 10a and 10b. Both power supply to the buffer 14 by the power supply unit 22 is stopped.
　次に、本実施形態のプロジェクターの動作を説明する。 Next, the operation of the projector of this embodiment will be described.
　図４に、制御部２０による電源制御および入力切替を含む一連の動作を示す。 FIG. 4 shows a series of operations including power supply control and input switching by the control unit 20.
　図４を参照すると、電源制御部２４が、自プロジェクターがスタンバイ状態であるか否かを判定する（ステップＳ２０）。自プロジェクターがスタンバイ状態である場合は、ＤＤＣ／ＣＩ２３ｂが、接続先の装置の動作状態を検出する（ステップＳ２１）。 Referring to FIG. 4, the power supply control unit 24 determines whether or not the projector is in a standby state (step S20). If the projector is in the standby state, the DDC / CI 23b detects the operating state of the connection destination device (step S21).
　接続先の装置が起動状態である場合、電源制御部２４は、バッファ用電源供給部２２によるバッファ１４への電源供給を行わせた状態とする（ステップＳ２２、Ｓ２３）。その後、入力切替制御部２５が、映像入力端子１０ａ側の入力が選択されるようにスイッチ３０を制御し（ステップＳ２４）、Ａ／Ｄ変換部１３が、スイッチ３０からの映像信号の有無を判定する（ステップＳ２５）。 When the connection destination device is in the activated state, the power control unit 24 is in a state where the buffer power supply unit 22 supplies power to the buffer 14 (steps S22 and S23). Thereafter, the input switching control unit 25 controls the switch 30 so that the input on the video input terminal 10a side is selected (step S24), and the A / D conversion unit 13 determines the presence / absence of the video signal from the switch 30. (Step S25).
　ステップＳ２５にて映像信号有りと判定された場合は、電源制御部２４が、バッファ用電源供給部２２によるバッファ１４への電源供給を行わせた状態とし（ステップＳ２８）、Ａ／Ｄ用電源供給部２１によるＡ／Ｄ変換部１３への電源供給を停止させた状態とする（ステップＳ２９）。 If it is determined in step S25 that there is a video signal, the power supply control unit 24 is in a state where the buffer power supply unit 22 supplies power to the buffer 14 (step S28), and A / D power supply is performed. The power supply to the A / D conversion unit 13 by the unit 21 is stopped (step S29).
　ステップＳ２５にて映像信号無しと判定された場合は、入力切替制御部２５が、映像入力端子１０ｂ側の入力が選択されるようにスイッチ３０を制御する（ステップＳ２６）。次に、Ａ／Ｄ変換部１３が、スイッチ３０からの映像信号の有無を検出する（ステップＳ２７）。 If it is determined in step S25 that there is no video signal, the input switching control unit 25 controls the switch 30 so that the input on the video input terminal 10b side is selected (step S26). Next, the A / D converter 13 detects the presence / absence of a video signal from the switch 30 (step S27).
　ステップＳ２７にて映像信号有りと判定された場合は、ステップＳ２８へ移行する。ステップＳ２７にて映像信号無しと判定された場合は、電源制御部２４が、バッファ用電源供給部２２によるバッファ１４への電源供給を停止させた状態とし（ステップＳ３０）、その後、ステップＳ２９へ移行する。 If it is determined in step S27 that there is a video signal, the process proceeds to step S28. When it is determined in step S27 that there is no video signal, the power control unit 24 stops the power supply to the buffer 14 by the buffer power supply unit 22 (step S30), and then the process proceeds to step S29. To do.
　ステップＳ２２において接続先の装置が起動状態でない場合、電源制御部２４が、バッファ用電源供給部２２によるバッファ１４への電源供給およびＡ／Ｄ用電源供給部２１によるＡ／Ｄ変換部１３への電源供給をそれぞれ停止させた状態とする（ステップＳ３２）。 When the connection destination device is not in the activated state in step S22, the power supply control unit 24 supplies power to the buffer 14 by the buffer power supply unit 22 and supplies power to the A / D conversion unit 13 by the A / D power supply unit 21. The power supply is stopped (step S32).
　ステップＳ２０においてスタンバイ状態でない場合、またはステップＳ２９、Ｓ３２のいずれかの処理が行われた場合は、一定時間待ち（ステップＳ３１）、その後、ステップＳ２０に移行する。 If it is not in the standby state in step S20, or if any of steps S29 and S32 is performed, the process waits for a predetermined time (step S31), and then proceeds to step S20.
　上述の処理によれば、スタンバイ状態において、映像出力端子１１に接続されたプロジェクターが起動状態でない間は、バッファ用電源供給部２２によるバッファ１４への電源供給は行われないので、その分、消費電力を低減することができる。 According to the above-described processing, in the standby state, while the projector connected to the video output terminal 11 is not in the activated state, the buffer power supply unit 22 does not supply power to the buffer 14, and accordingly, consumption is increased accordingly. Electric power can be reduced.
　また、スタンバイ状態において、映像入力端子１０ａ、１０ｂのいずれにも映像信号が供給されていない場合は、バッファ用電源供給部２２によるバッファ１４への電源供給は行われないので、その分、消費電力を低減することができる。 In addition, in the standby state, when no video signal is supplied to any of the video input terminals 10a and 10b, the buffer power supply unit 22 does not supply power to the buffer 14, and accordingly, power consumption is increased accordingly. Can be reduced.
　加えて、前述のプロジェクターＰＪ－Ａの映像出力端子をプロジェクターＰＪ－Ｂの映像入力端子に接続したものを会議室等に常設した利用形態において、以下のような効果もある。プロジェクターＰＪ－Ａ、ＰＪ－Ｂはともに、本実施形態のプロジェクターと同じ構成を有するものと仮定する。 In addition, the use form in which the video output terminal of the projector PJ-A is connected to the video input terminal of the projector PJ-B is permanently installed in a conference room or the like has the following effects. Both the projectors PJ-A and PJ-B are assumed to have the same configuration as the projector of this embodiment.
　映像供給装置からの映像信号に基づく画像をプロジェクターＰＪ－Ｂで投射する場合で、プロジェクターＰＪ－Ａの、映像供給装置が接続された映像入力端子側の入力が、スイッチ３０にて選択されていない場合は、プロジェクターＰＪ－Ａにおいて、図４のステップＳ２３～Ｓ３０の入力切替処理が行われる。この処理により、映像供給装置が接続された映像入力端子側の入力がスイッチ３０にて自動的に選択される。よって、ユーザは、プロジェクターＰＪ－Ａを一旦起動して入力切替操作を行う必要がない。 When an image based on the video signal from the video supply device is projected by the projector PJ-B, the input on the video input terminal side of the projector PJ-A to which the video supply device is connected is not selected by the switch 30 In this case, the projector PJ-A performs the input switching process in steps S23 to S30 in FIG. By this processing, the input on the video input terminal side to which the video supply device is connected is automatically selected by the switch 30. Therefore, the user does not need to start the projector PJ-A once and perform the input switching operation.
　また、入力切替処理中、Ａ／Ｄ用電源供給部２１によるＡ／Ｄ変換部１３への電源供給が行われるが、この入力切替処理に要する時間は、ユーザが、プロジェクターＰＪ－Ａを起動して入力切替操作を行う場合に要する時間に比べて極端に短い。よって、入力切替処理中における電力消費量は、ユーザが手動により入力切替を行う場合に比較して少ない。 Further, during the input switching process, the A / D power supply unit 21 supplies power to the A / D conversion unit 13, and the user activates the projector PJ-A during the time required for the input switching process. This is extremely short compared to the time required for input switching operation. Therefore, the power consumption during the input switching process is smaller than when the user manually performs input switching.
　なお、プロジェクターＰＪ－Ａにおいて、ステップＳ２１の接続先装置の動作状態の検出を行う前に、接続先であるプロジェクターＰＪ－Ｂにおいて、プロジェクターＰＪ－Ａが接続された映像入力端子側の入力がスイッチ３０にて選択されている必要がある。このプロジェクターＰＪ－Ｂにおけるスイッチ３０の設定は、通常、ユーザが、プロジェクターＰＪ－Ｂを起動した際に行うが、プロジェクターＰＪ－Ｂを起動後、制御部２０が、図４に示したステップＳ２４～Ｓ２７の処理を個別に実行してもよい。 Before the projector PJ-A detects the operation state of the connection destination device in step S21, the input on the video input terminal side to which the projector PJ-A is connected is switched to the projector PJ-B that is the connection destination. Must be selected at 30. The setting of the switch 30 in the projector PJ-B is normally performed when the user activates the projector PJ-B. After the projector PJ-B is activated, the control unit 20 performs steps S24 to S24 shown in FIG. You may perform the process of S27 separately.
　（第３の実施形態）
　図５は、本発明の第３の実施形態であるプロジェクターの構成を示すブロック図である。 (Third embodiment)
FIG. 5 is a block diagram showing a configuration of a projector according to the third embodiment of the present invention.
　本実施形態のプロジェクターは、第２の実施形態のものの構成に加えて、ビデオ信号用の処理部、ＬＥＤによる入力状態表示部およびＲＳ２３２Ｃを用いた通信処理部を備える。ビデオ信号用の処理部は、映像入力端子４０ａ、４０ｂ、映像出力端子４１、スイッチ３２、ビデオデコーダ３３、ビデオ用のバッファ３４、入力切替制御部２６、デコーダ用電源供給部２７およびバッファ用電源供給部２８を有する。入力状態表示部は、ＬＥＤ５０ａ、５０ｂおよびＬＥＤ制御部２９を有する。ＲＳ２３２Ｃを用いた通信処理部は、信号入出力端子４３およびＲＳ２３２Ｃインタフェース部６０からなる。 The projector according to this embodiment includes a video signal processing unit, an LED input state display unit, and a communication processing unit using RS232C, in addition to the configuration of the second embodiment. The video signal processing unit includes video input terminals 40a and 40b, video output terminal 41, switch 32, video decoder 33, video buffer 34, input switching control unit 26, decoder power supply unit 27, and buffer power supply. Part 28. The input state display unit includes LEDs 50 a and 50 b and an LED control unit 29. The communication processing unit using RS232C includes a signal input / output terminal 43 and an RS232C interface unit 60.
　スイッチ３２は、映像入力端子４０ａに供給される映像信号（ビデオ信号）を一方の入力とし、映像入力端子４０ｂに供給される映像信号（ビデオ信号）を他方の入力とし、これら入力のいずれかを選択して出力する。スイッチ３２の出力は、ビデオデコーダ３３およびビデオ用のバッファ３４に供給される。 The switch 32 has a video signal (video signal) supplied to the video input terminal 40a as one input, a video signal (video signal) supplied to the video input terminal 40b as the other input, and any one of these inputs. Select and output. The output of the switch 32 is supplied to a video decoder 33 and a video buffer 34.
　ビデオデコーダ３３は、スイッチ３２からの映像信号をデコードするものであって、スイッチ３２からの映像信号の有無を検出する機能を備えている。検出結果は、ビデオデコーダ３３から入力切替制御部２６に供給される。バッファ３４は、スイッチ３２からの映像信号を一時的に保持する。バッファ３４から出力された映像信号は、映像出力端子４１に供給される。 The video decoder 33 decodes the video signal from the switch 32 and has a function of detecting the presence or absence of the video signal from the switch 32. The detection result is supplied from the video decoder 33 to the input switching control unit 26. The buffer 34 temporarily holds the video signal from the switch 32. The video signal output from the buffer 34 is supplied to the video output terminal 41.
　デコーダ用電源供給部２７は、ビデオデコーダ３３に電力を供給する。バッファ用電源供給部２８は、バッファ３４に電力を供給する。ＲＳ２３２Ｃインタフェース部６０は、信号入出力端子４３を通じて、映像出力端子１１、４１のいずれかに接続された装置との相互通信が可能であり、その装置の動作状態を検出する。接続先装置の動作状態の検出は、ＲＳ２３２Ｃインタフェース部６０とＤＤＣ／ＣＩ２３ｂのどちらを用いてもよい。 The decoder power supply unit 27 supplies power to the video decoder 33. The buffer power supply unit 28 supplies power to the buffer 34. The RS232C interface unit 60 can communicate with a device connected to one of the video output terminals 11 and 41 through the signal input / output terminal 43, and detects an operation state of the device. Either the RS232C interface unit 60 or the DDC / CI 23b may be used to detect the operation state of the connection destination device.
　入力切替制御部２６は、ビデオデコーダ３３からの検出結果に基づいてスイッチ３２の入力を切り替える。具体的には、入力切替制御部２６は、スイッチ３２にて一方の入力が選択された第１の状態とスイッチ３２にて他方の入力が選択された第２の状態とのそれぞれにおいて、ビデオデコーダ３３からの検出結果を取得し、その検出結果に基づいて、映像入力端子４０ａ、４０ｂのどちらに映像信号が入力されているかを判定する。そして、入力切替制御部２６は、映像信号が供給されている映像入力端子側の入力を選択するようにスイッチ３２を制御する。また、入力切替制御部２６は、スイッチ３２の入力切替制御の開始および終了を示す信号を電源制御部２４に供給する。 The input switching control unit 26 switches the input of the switch 32 based on the detection result from the video decoder 33. Specifically, the input switching control unit 26 performs video decoders in each of the first state in which one input is selected by the switch 32 and the second state in which the other input is selected by the switch 32. The detection result from 33 is acquired, and based on the detection result, it is determined to which of the video input terminals 40a and 40b the video signal is input. The input switching control unit 26 controls the switch 32 so as to select the input on the video input terminal side to which the video signal is supplied. Further, the input switching control unit 26 supplies a signal indicating the start and end of the input switching control of the switch 32 to the power supply control unit 24.
　電源制御部２４は、自プロジェクターがスタンバイ状態であるか否かを判定し、スタンバイ状態である場合に、ＤＤＣ／ＣＩ２３ｂまたはＲＳ２３２Ｃインタフェース部から供給された接続先であるプロジェクターの動作状態に応じて、バッファ用電源供給部２２、２８によるバッファ１４、３４への電力供給およびＡ／Ｄ変換部１３、ビデオデコーダ３３への電源供給をそれぞれ制御する。さらに、電源制御部２４は、スタンバイ状態において、映像入力端子１０ａ、１０ｂのいずれにも映像信号が入力されていない場合は、Ａ／Ｄ変換部１３およびバッファ１４への電力供給を停止させ、映像入力端子４０ａ、４０ｂのいずれにも映像信号が入力されていない場合には、ビデオデコーダ３３およびバッファ３４への電力供給を停止させる。 The power supply control unit 24 determines whether or not the projector is in a standby state. The power supply to the buffers 14 and 34 by the buffer power supply units 22 and 28 and the power supply to the A / D conversion unit 13 and the video decoder 33 are controlled. Further, in the standby state, the power supply control unit 24 stops the power supply to the A / D conversion unit 13 and the buffer 14 when no video signal is input to any of the video input terminals 10a and 10b, and the video When no video signal is input to any of the input terminals 40a and 40b, power supply to the video decoder 33 and the buffer 34 is stopped.
　ＬＥＤ５０ａの点灯色は、ＬＥＤ５０ｂの点灯色と異なる。ＬＥＤ制御部２９は、入力切替制御部２５から映像入力端子１０ａ、１０ｂのいずれに映像信号（ＲＧＢ）が入力されているかを示す信号を受信する。映像信号が映像入力端子１０ａに供給されていることを示す信号を入力切替制御部２５から受信した場合は、ＬＥＤ制御部２９は、第１の点灯パターンでＬＥＤ５０ａを点灯させる。映像信号が映像入力端子１０ｂに供給されていることを示す信号を入力切替制御部２５から受信した場合は、ＬＥＤ制御部２９は、第１の点灯パターンとは異なる第２の点灯パターンでＬＥＤ５０ａを点灯させる。 The lighting color of the LED 50a is different from the lighting color of the LED 50b. The LED control unit 29 receives from the input switching control unit 25 a signal indicating to which of the video input terminals 10a and 10b the video signal (RGB) is being input. When the signal indicating that the video signal is supplied to the video input terminal 10a is received from the input switching control unit 25, the LED control unit 29 lights the LED 50a with the first lighting pattern. When the signal indicating that the video signal is supplied to the video input terminal 10b is received from the input switching control unit 25, the LED control unit 29 sets the LED 50a in a second lighting pattern different from the first lighting pattern. Light up.
　ＬＥＤ制御部２９は、入力切替制御部２６から映像入力端子４０ａ、４０ｂのいずれに映像信号（ビデオ）が入力されているかを示す信号を受信する。映像信号が映像入力端子４０ａに供給されていることを示す信号を入力切替制御部２６から受信した場合は、ＬＥＤ制御部２９は、第３の点灯パターンでＬＥＤ５０ｂを点灯させる。映像信号が映像入力端子４０ｂに供給されていることを示す信号を入力切替制御部２６から受信した場合は、ＬＥＤ制御部２９は、第３の点灯パターンとは異なる第４の点灯パターンでＬＥＤ５０ｂを点灯させる。 The LED control unit 29 receives from the input switching control unit 26 a signal indicating to which of the video input terminals 40a and 40b the video signal (video) is being input. When the signal indicating that the video signal is supplied to the video input terminal 40a is received from the input switching control unit 26, the LED control unit 29 turns on the LED 50b with the third lighting pattern. When the signal indicating that the video signal is supplied to the video input terminal 40b is received from the input switching control unit 26, the LED control unit 29 sets the LED 50b with a fourth lighting pattern different from the third lighting pattern. Light up.
　次に、本実施形態のプロジェクターの動作を説明する。 Next, the operation of the projector of this embodiment will be described.
　図６に、制御部２０による電源制御および入力切替を含む一連の動作を示す。 FIG. 6 shows a series of operations including power supply control and input switching by the control unit 20.
　図６を参照すると、電源制御部２４が、自プロジェクターがスタンバイ状態であるか否かを判定する（ステップＳ４０）。自プロジェクターがスタンバイ状態である場合は、ＤＤＣ／ＣＩ２３ｂ（またはＲＳ２３２Ｃインタフェース部６０）が、接続先の装置の動作状態を検出する（ステップＳ４１）。電源制御部２４が、接続先の装置の動作状態が起動状態であるか否かを判定する（ステップＳ４２）。動作状態が起動状態でない場合は、電源制御部２４が、Ａ／Ｄ変換部１３、バッファ１４、３４およびビデオレコーダ３３の電源供給をそれぞれ停止させた状態とする（ステップＳ６２）。 Referring to FIG. 6, the power supply control unit 24 determines whether or not the projector is in a standby state (step S40). When the projector is in the standby state, the DDC / CI 23b (or the RS232C interface unit 60) detects the operation state of the connection destination device (step S41). The power supply control unit 24 determines whether or not the operation state of the connection destination device is an activated state (step S42). When the operating state is not the activated state, the power supply control unit 24 stops the power supply to the A / D conversion unit 13, the buffers 14 and 34, and the video recorder 33 (step S62).
　ステップＳ４２において、接続先の装置の動作状態が起動状態であると判定された場合、電源制御部２４が、自プロジェクターが接続先の装置のＲＧＢとビデオのいずれの入力に接続されているかを判定する（ステップＳ４３）。この判定も、接続先の装置の動作状態に基づいて行う。 In step S42, when it is determined that the operation state of the connection destination device is the active state, the power supply control unit 24 determines whether the projector is connected to RGB or video input of the connection destination device. (Step S43). This determination is also made based on the operating state of the connection destination device.
　ステップＳ４３にてＲＧＢであると判定された場合は、電源制御部２４が、ビデオ用のバッファ３４への電力供給を停止させ、Ａ／Ｄ変換部１３への電力供給を行わせた状態とする（ステップＳ４４）。 If it is determined in step S43 that the color is RGB, the power supply control unit 24 stops the power supply to the video buffer 34 and the power supply to the A / D conversion unit 13 is performed. (Step S44).
　Ａ／Ｄ変換部１３への電力供給の開始後、入力切替制御部２５が、映像入力端子１０ａ側の入力が選択されるようにスイッチ３０を制御する（ステップＳ４５）。次に、Ａ／Ｄ変換部１３が、スイッチ３０からの映像信号の有無を判定する（ステップＳ４６）。映像信号有りの場合は、電源制御部２４が、ＲＧＢ用のバッファ１４への伝欲供給を行わせた状態とし（ステップＳ４７）、さらに、電源制御部２４が、Ａ／Ｄ変換部１３への電源供給を停止させた状態とする（ステップＳ４８）。 After the start of power supply to the A / D conversion unit 13, the input switching control unit 25 controls the switch 30 so that the input on the video input terminal 10a side is selected (step S45). Next, the A / D conversion unit 13 determines whether or not there is a video signal from the switch 30 (step S46). When there is a video signal, the power supply control unit 24 is in a state where the greedy supply to the RGB buffer 14 is performed (step S47), and further, the power supply control unit 24 supplies the signal to the A / D conversion unit 13. The power supply is stopped (step S48).
　ステップＳ４６の判定結果が映像信号無しである場合は、入力切替制御部２５が、映像入力端子１０ｂ側の入力が選択されるようにスイッチ３０を制御する（ステップＳ４９）。次に、Ａ／Ｄ変換部１３が、スイッチ３０からの映像信号の有無を検出する（ステップＳ５０）。映像信号有りの場合は、ステップＳ４７へ移行する。映像信号無しの場合は、電源制御部２４が、ＲＧＢ用のバッファ１４への電力供給を停止させた状態とし（ステップＳ５１）、その後、ステップＳ４８へ移行する。 If the determination result in step S46 is that there is no video signal, the input switching control unit 25 controls the switch 30 so that the input on the video input terminal 10b side is selected (step S49). Next, the A / D converter 13 detects the presence / absence of a video signal from the switch 30 (step S50). If there is a video signal, the process proceeds to step S47. If there is no video signal, the power supply control unit 24 stops the power supply to the RGB buffer 14 (step S51), and then proceeds to step S48.
　ステップＳ４３にてビデオであると判定された場合は、電源制御部２４が、ＲＧＢ用のバッファ１４への電力供給を停止させ、ビデオデコーダ３３への電力供給を開始させた状態とする（ステップＳ５２）。 If it is determined in step S43 that the video is a video, the power supply control unit 24 stops supplying power to the RGB buffer 14 and starts supplying power to the video decoder 33 (step S52). ).
　ビデオデコーダ３３への電力供給の開始後、入力切替制御部２６が、映像入力端子４０ａ側の入力が選択されるようにスイッチ３２を制御する（ステップＳ５３）。次に、ビデオデコーダ３３が、スイッチ３２からの映像信号の有無を判定する（ステップＳ５４）。映像信号有りの場合は、電源制御部２４が、ビデオ用のバッファ３４への電力供給を行わせた状態とし（ステップＳ５５）、さらに、ビデオデコーダ３３への電源供給を停止させた状態とする（ステップＳ５６）。 After the start of power supply to the video decoder 33, the input switching control unit 26 controls the switch 32 so that the input on the video input terminal 40a side is selected (step S53). Next, the video decoder 33 determines whether there is a video signal from the switch 32 (step S54). If there is a video signal, the power control unit 24 is in a state where power is supplied to the video buffer 34 (step S55), and further, the power supply to the video decoder 33 is stopped (step S55). Step S56).
　ステップＳ５４の判定結果が映像信号無しである場合は、入力切替制御部２６が、映像入力端子４０ｂ側の入力が選択されるようにスイッチ３２を制御する（ステップＳ５７）。次に、ビデオデコーダ３３が、スイッチ３２からの映像信号の有無を検出する（ステップＳ５８）。映像信号有りの場合は、ステップＳ５５へ移行する。映像信号無しの場合は、電源制御部２４が、ビデオ用のバッファ３４への電力供給を停止させた状態とし（ステップＳ５９）、その後、ステップＳ５６へ移行する。 If the determination result in step S54 is that there is no video signal, the input switching control unit 26 controls the switch 32 so that the input on the video input terminal 40b side is selected (step S57). Next, the video decoder 33 detects the presence / absence of a video signal from the switch 32 (step S58). If there is a video signal, the process proceeds to step S55. If there is no video signal, the power supply control unit 24 stops the power supply to the video buffer 34 (step S59), and then proceeds to step S56.
　ステップＳ４０にて動作状態がスタンバイ状態でないと判定された場合またはステップＳ４８、Ｓ５６、Ｓ６０のいずれか処理が行われた場合は、一定時間待ち（ステップＳ６１）、その後、ステップＳ４０に移行する。 If it is determined in step S40 that the operation state is not the standby state, or if any of steps S48, S56, and S60 is performed, the process waits for a predetermined time (step S61), and then proceeds to step S40.
　上述の処理によれば、スタンバイ状態において、映像出力端子１１（または映像出力端子４１）に接続されたプロジェクターが起動状態でない間は、Ａ／Ｄ変換部１３、バッファ１４、３４およびビデオデコーダ３３への電源供給は行われないので、その分、消費電力を低減することができる。 According to the above-described processing, in the standby state, while the projector connected to the video output terminal 11 (or the video output terminal 41) is not in the activated state, the A / D conversion unit 13, the buffers 14 and 34, and the video decoder 33 are processed. Therefore, the power consumption can be reduced accordingly.
　また、スタンバイ状態において、映像入力端子１０ａ、１０ｂのいずれにも映像信号（ＲＧＢ）が供給されていない場合は、Ａ／Ｄ変換部１３およびバッファ１４への電源供給は行われない。これと同様に、映像入力端子４０ａ、４０ｂのいずれにも映像信号（ビデオ）が供給されていない場合は、ビデオデコーダ３３およびバッファ３４への電源供給は行われない。これにより、消費電力を低減することができる。 In the standby state, when the video signal (RGB) is not supplied to any of the video input terminals 10a and 10b, power is not supplied to the A / D converter 13 and the buffer 14. Similarly, when a video signal (video) is not supplied to any of the video input terminals 40a and 40b, power is not supplied to the video decoder 33 and the buffer 34. Thereby, power consumption can be reduced.
　本実施形態のプロジェクターを２台用意し、一方のプロジェクターの映像出力端子を他方のプロジェクターの映像入力端子に接続した状態で会議室等に常設する場合の利点について説明する。 An advantage in the case where two projectors according to the present embodiment are prepared and the video output terminal of one projector is connected to the video input terminal of the other projector and is permanently installed in a conference room or the like will be described.
　図７に、２台のプロジェクターを接続した状態を模式的に示す。図７において、プロジェクターＰＪ－Ａ、ＰＪ－Ｂはいずれも図５に示した構成を有する。プロジェクターＰＪ－Ａ、において、ＲＧＢ（１）、ＲＧＢ（２）、ビデオ（１）、ビデオ（２）、ＲＧＢ　ＯＵＴ、ＰＪ－Ｂのそれぞれにおいて、ビデオＯＵＴ、ＲＳ２３２Ｃはそれぞれ、図５に示した映像入力端子１０ａ、１０ｂ、４０ａ、４０ｂ、映像出力端子１１、４１、信号入出力端子４３に対応する。 Fig. 7 schematically shows a state in which two projectors are connected. In FIG. 7, projectors PJ-A and PJ-B both have the configuration shown in FIG. In the projector PJ-A, in each of RGB (1), RGB (2), video (1), video (2), RGB OUT, and PJ-B, the video OUT and RS232C are the images shown in FIG. It corresponds to the input terminals 10a, 10b, 40a, 40b, the video output terminals 11, 41, and the signal input / output terminal 43.
　プロジェクターＰＪ－Ａの映像出力端子１１（ＲＧＢ　ＯＵＴ）が、プロジェクターＰＪ－Ｂの映像入力端子１０ａ（ＲＧＢ（１））に接続されている。プロジェクターＰＪ－Ａの映像出力端子４１（ビデオＯＵＴ）が、プロジェクターＰＪ－Ｂの映像入力端子４０ａ（ビデオ（１））に接続されている。プロジェクターＰＪ－Ａの信号入出力端子４３（ＲＳ２３２Ｃ）は、プロジェクターＰＪ－Ｂの信号入出力端子４３（ＲＳ２３２Ｃ）に接続されている。 The video output terminal 11 (RGB OUT) of the projector PJ-A is connected to the video input terminal 10a (RGB (1)) of the projector PJ-B. The video output terminal 41 (video OUT) of the projector PJ-A is connected to the video input terminal 40a (video (1)) of the projector PJ-B. The signal input / output terminal 43 (RS232C) of the projector PJ-A is connected to the signal input / output terminal 43 (RS232C) of the projector PJ-B.
　ユーザは、ノート型のパーソナルコンピュータ７０やビデオデッキ７１の映像供給装置をプロジェクターＰＪ－Ａに接続して、それら映像供給装置からの映像信号に基づく画像を、プロジェクターＰＪ－Ａ、ＰＪ－Ｂの一方または両方で投射させることができる。 The user connects the video supply device of the notebook personal computer 70 or the video deck 71 to the projector PJ-A, and displays an image based on the video signal from the video supply device on one of the projectors PJ-A and PJ-B. Or it can be projected on both.
　パーソナルコンピュータ７０からの映像信号に基づく画像をプロジェクターＰＪ－Ｂで投射する場合で、プロジェクターＰＪ－Ａの、パーソナルコンピュータ７０が接続された映像入力端子１０ａ側の入力が、スイッチ３０にて選択されていない場合は、プロジェクターＰＪ－Ａにおいて、図６のステップＳ４５～Ｓ４８の入力切替処理が行われる。この処理により、パーソナルコンピュータ７０が接続された映像入力端子１０ａ側の入力がスイッチ３０にて自動的に選択される。よって、ユーザは、プロジェクターＰＪ－Ａを一旦起動して入力切替操作を行う必要がない。 When an image based on the video signal from the personal computer 70 is projected by the projector PJ-B, the input on the video input terminal 10a side to which the personal computer 70 of the projector PJ-A is connected is selected by the switch 30. If not, the projector PJ-A performs input switching processing in steps S45 to S48 in FIG. By this processing, the input on the video input terminal 10a side to which the personal computer 70 is connected is automatically selected by the switch 30. Therefore, the user does not need to start the projector PJ-A once and perform the input switching operation.
　また、ビデオデッキ７１からの映像信号に基づく画像をプロジェクターＰＪ－Ｂで投射する場合で、プロジェクターＰＪ－Ａの、ビデオデッキ７１が接続された映像入力端子４０ａ側の入力が、スイッチ３２にて選択されていない場合は、プロジェクターＰＪ－Ａにおいて、図６のステップＳ４５～Ｓ４８の入力切替処理が行われる。この処理により、ビデオデッキ７１が接続された映像入力端子４０ａ側の入力がスイッチ３２にて自動的に選択される。この場合も、ユーザは、プロジェクターＰＪ－Ａを一旦起動して入力切替操作を行う必要がない。 When an image based on the video signal from the video deck 71 is projected by the projector PJ-B, the input on the video input terminal 40a side to which the video deck 71 of the projector PJ-A is connected is selected by the switch 32. If not, the projector PJ-A performs the input switching process in steps S45 to S48 in FIG. By this processing, the input on the video input terminal 40a side to which the video deck 71 is connected is automatically selected by the switch 32. Also in this case, the user does not need to start the projector PJ-A once and perform the input switching operation.
　上記のような入力切替処理において、Ａ／Ｄ用電源供給部２１によるＡ／Ｄ変換部１３への電源供給またはデコーダ用電源供給部２７によるビデオデコーダ３３への電源供給が行われるが、この入力切替処理に要する時間は、ユーザが、プロジェクターＰＪ－Ａを起動して入力切替操作を行う場合に要する時間に比べて極端に短い。よって、電力消費量を削減することができる。 In the input switching process as described above, power is supplied to the A / D conversion unit 13 by the A / D power supply unit 21 or power is supplied to the video decoder 33 by the decoder power supply unit 27. The time required for the switching process is extremely short compared to the time required for the user to start the projector PJ-A and perform the input switching operation. Therefore, power consumption can be reduced.
　なお、図６に示した手順において、ステップＳ４０の前に、ＬＥＤ制御部２９が、ＬＥＤ５０ａ、５０ｂを消灯させるステップと、ステップＳ４６にて信号有りの判定がなされた場合に、ＬＥＤ制御部２９が、ＬＥＤ５０ａを第１の点灯パターンで点灯させるステップと、ステップＳ４９にて信号有りの判定がなされた場合に、ＬＥＤ制御部２９が、ＬＥＤ５０ｂを第２の点灯パターンで点灯させるステップと、ステップＳ５４にて信号有りの判定がなされた場合に、ＬＥＤ制御部２９が、ＬＥＤ５０ｂを第３の点灯パターンで点灯させるステップと、ステップＳ５８にて信号有りの判定がなされた場合に、ＬＥＤ制御部２９が、ＬＥＤ５０ｂを第４の点灯パターンで点灯させるステップと、を設けてもよい。 In the procedure shown in FIG. 6, the LED control unit 29 turns off the LEDs 50a and 50b before step S40, and when the presence of a signal is determined in step S46, the LED control unit 29 The step of lighting the LED 50a with the first lighting pattern, and the step of lighting the LED 50b with the second lighting pattern when the presence of a signal is determined in step S49, and the step S54. When the presence of a signal is determined, the LED control unit 29 turns on the LED 50b with the third lighting pattern, and when the presence of a signal is determined in step S58, the LED control unit 29 You may provide the step which makes LED50b light by a 4th lighting pattern.
　上記のＬＥＤ点灯処理によれば、プロジェクターがスタンバイ状態にある場合、スイッチ３０、３２にて選択されている入力側の映像入力端子に対応する点灯パターンでＬＥＤ５０ａ、５０ｂが点灯制御される。このため、ユーザは、ＬＥＤ５０ａの点灯パターンに基づいて、現在、スイッチ３０にて映像入力端子１０ａ、１０ｂのいずれの側の入力が選択されているかを知ることができる。同様に、ユーザは、ＬＥＤ５０ｂの点灯パターンに基づいて、現在、スイッチ３２にて映像入力端子４０ａ、４０ｂのいずれの側の入力が選択されているかを知ることができる。 According to the above LED lighting process, when the projector is in the standby state, the LEDs 50a and 50b are controlled to be lighted with the lighting pattern corresponding to the video input terminal on the input side selected by the switches 30 and 32. For this reason, the user can know which side of the video input terminals 10a and 10b is currently selected by the switch 30 based on the lighting pattern of the LED 50a. Similarly, the user can know which side of the video input terminals 40a, 40b is currently selected by the switch 32 based on the lighting pattern of the LED 50b.
　上記のＬＥＤ点灯を利用することで、ユーザは、図７に示したプロジェクターＰＪ－Ａ、ＰＪ－Ｂを設置する際に、プロジェクターＰＪ－Ａ、ＰＪ－Ｂの間の接続が正確に行われているかを確認することができる。具体的には、プロジェクターＰＪ－Ａ、ＰＪ－Ｂを接続した後、プロジェクターＰＪ－Ａ、ＰＪ－Ｂをそれぞれスタンバイ状態として、映像供給装置をプロジェクターＰＪ－Ａに接続する。この状態で、映像供給装置からプロジェクターＰＪ－Ａに映像信号を供給すれば、プロジェクターＰＪ－Ａ、ＰＪ－Ｂの各ＬＥＤの点灯パターンを確認することで、プロジェクターＰＪ－Ａ、ＰＪ－Ｂの間で誤接続がなされていないかを確認することができる。 By utilizing the above LED lighting, the user can accurately connect the projectors PJ-A and PJ-B when installing the projectors PJ-A and PJ-B shown in FIG. Can be confirmed. Specifically, after connecting the projectors PJ-A and PJ-B, the projectors PJ-A and PJ-B are set in the standby state, and the video supply device is connected to the projector PJ-A. In this state, if a video signal is supplied from the video supply device to the projector PJ-A, the lighting pattern of each LED of the projectors PJ-A and PJ-B can be checked, so that the projector PJ-A and PJ-B It is possible to confirm whether or not there is an incorrect connection.
　また、スタンバイ状態になった後、映像信号が入力されるまでの間において、ＬＥＤ制御部２９が、電源オフ時に使用していた点灯パターンでＬＥＤ５０ａ、５０ｂを制御するように構成してもよい。この場合は、ユーザは、映像供給装置をスタンバイ状態のプロジェクターＰＪ－Ａに接続する際に、プロジェクターＰＪ－Ａを起動させることなく、ＬＥＤ５０ａ、５０ｂの点灯パターンに基づいて、現在、どの入力が選択されているかを知ることができる。したがって、ユーザは、映像供給装置を、現在選択されている入力側の映像入力端子に接続することができる。 Alternatively, the LED control unit 29 may be configured to control the LEDs 50a and 50b with the lighting pattern used when the power is turned off until the video signal is input after entering the standby state. In this case, when connecting the video supply device to the projector PJ-A in the standby state, the user selects which input is currently selected based on the lighting pattern of the LEDs 50a and 50b without starting the projector PJ-A. You can know what is being done. Therefore, the user can connect the video supply device to the currently selected video input terminal on the input side.
　図７に示したシステムは本発明のプロジェクターを用いた画像システムの一例である。図７の例では、２台のプロジェクターが接続されているが、３台以上のプロジェクターを縦続接続してもよい。３台以上のプロジェクターを従属接続する場合は、１台目のプロジェクターの映像出力端子を２台目のプロジェクターの映像入力端子に接続し、２台目のプロジェクターの映像出力端子を３台目のプロジェクターの映像入力端子に接続する、といった接続形態となる。 The system shown in FIG. 7 is an example of an image system using the projector of the present invention. In the example of FIG. 7, two projectors are connected, but three or more projectors may be connected in cascade. When subordinately connecting more than two projectors, connect the video output terminal of the first projector to the video input terminal of the second projector, and connect the video output terminal of the second projector to the third projector. To the video input terminal.
　以上説明した各実施形態のプロジェクターは、本発明の一例であり、その構成および動作は発明の趣旨を逸脱しない範囲で適宜に変更することができる。例えば、プロジェクターの接続先はプロジェクターに限定されるものではない。プロジェクターの接続先としては、プロジェクターからの映像信号を処理することのできる装置、例えば、液晶ディスプレイやＣＲＴ等に代表される他の画像表示装置であってもよい。 The projectors of the embodiments described above are examples of the present invention, and the configuration and operation thereof can be changed as appropriate without departing from the spirit of the invention. For example, the connection destination of the projector is not limited to the projector. The connection destination of the projector may be a device that can process a video signal from the projector, for example, another image display device represented by a liquid crystal display, a CRT, or the like.
　また、各実施形態において、プロジェクターは、ＵＳＢ（Universal　Serial　Bus）用の端子を有していてもよい。ＵＳＢ用の端子には、マウス等の入力装置や半導体メモリ等を接続することが可能である。入力装置をＵＳＢ用の端子に接続した場合は、その入力装置を用いてプロジェクターを操作することが可能である。半導体メモリをＵＳＢ用の端子に接続した場合は、そのメモリ内の情報を表示することが可能である。 In each embodiment, the projector may have a USB (Universal Serial Bus) terminal. An input device such as a mouse, a semiconductor memory, or the like can be connected to the USB terminal. When an input device is connected to a USB terminal, the projector can be operated using the input device. When a semiconductor memory is connected to a USB terminal, information in the memory can be displayed.
　さらに、第２および第３の実施形態において、Ａ／Ｄ変換部１３やビデオデコーダ３３の信号検出機能を制御部２０が有していてもよい。 Furthermore, in the second and third embodiments, the control unit 20 may have signal detection functions of the A / D conversion unit 13 and the video decoder 33.
　また、第３の実施形態において、ＬＥＤの代わりに他の発光素子を用いることも可能である。 Further, in the third embodiment, other light emitting elements can be used instead of LEDs.
　本発明は、プロジェクターの他、液晶ディスプレイやプラズマディスプレイ等に代表される画像表示装置全般に適用することができる。 The present invention can be applied not only to projectors but also to image display devices such as liquid crystal displays and plasma displays in general.

Claims (9)

  1. 　映像出力端子および該映像出力端子に出力される映像信号を保持するバッファを備えたプロジェクターであって、
    　前記バッファから前記映像出力端子を介して出力された映像信号を用いた処理を行う接続先装置の動作状態を検出するためのインタフェースと、
    　前記インタフェースが検出した前記接続先装置の動作状態に応じて前記バッファへの電力供給を制御する制御部を有し、
    　前記制御部は、前記接続先装置の状態が前記映像信号を処理する起動状態に無いことを示すものである場合には、前記バッファへの電力供給を停止する、プロジェクター。     A projector comprising a video output terminal and a buffer for holding a video signal output to the video output terminal,
    An interface for detecting an operation state of a connection destination device that performs processing using a video signal output from the buffer via the video output terminal;
    A control unit that controls power supply to the buffer according to an operation state of the connection destination device detected by the interface;
    The control unit stops the power supply to the buffer when the state of the connection destination device indicates that the connection destination device is not in an activated state for processing the video signal.
  2. 　第１および第２の映像入力端子と、
    　前記第１の映像入力端子を介して入力される映像信号を第１の入力とし、前記第２の映像入力端子を介して入力される映像信号を第２の入力とし、これら入力のいずれかを選択して出力するスイッチと、をさらに有し、
    　前記制御部は、前記スイッチを制御するとともに、前記スイッチから映像信号が出力されるか否かを監視し、前記スイッチにて前記第１の入力を選択させた第１の状態および前記スイッチにて前記第２の入力を選択させた第２の状態のそれぞれにおいて、前記スイッチから映像信号が出力されない場合に、前記バッファへの電力供給を停止する、請求の範囲第１項に記載のプロジェクター。     First and second video input terminals;
    A video signal input via the first video input terminal is a first input, a video signal input via the second video input terminal is a second input, and any of these inputs is A switch for selecting and outputting,
    The control unit controls the switch, monitors whether a video signal is output from the switch, and selects the first input by the switch and the switch. 2. The projector according to claim 1, wherein power supply to the buffer is stopped when no video signal is output from the switch in each of the second states in which the second input is selected.
  3. 　前記スイッチの出力を入力とし、前記スイッチから映像信号が供給されたか否かを判定する信号検出部を、さらに有し、
    　前記制御部は、自プロジェクターの主電源がオンとされ、電源がオフとされるスタンバイ状態において、前記接続先装置の状態が前記起動状態であることを検出した場合に、前記信号検出部に電力を供給し、前記第１および第２の状態のいずれかにおいて、前記信号検出部にて映像信号が検出されると、前記バッファへの電力供給を行うとともに、前記信号検出部への電力供給を停止する、請求の範囲第２項に記載のプロジェクター。     A signal detector that receives the output of the switch and determines whether a video signal is supplied from the switch;
    When the control unit detects that the state of the connection destination device is the startup state in a standby state in which the main power of the projector is turned on and the power is turned off, the control unit supplies power to the signal detection unit. When the video signal is detected by the signal detection unit in any of the first and second states, power is supplied to the buffer and power is supplied to the signal detection unit. The projector according to claim 2, which stops.
  4. 　発光素子をさらに有し、
    　前記制御部は、
    　前記第１の状態において、前記信号検出部にて映像信号が検出された場合は、前記スイッチを前記第１の状態で維持するとともに、第１の点灯パターンで前記発光素子を点灯させ、
    　前記第２の状態において、前記信号検出部にて映像信号が検出された場合は、前記スイッチを前記第２の状態で維持するとともに、前記第１の点灯パターンとは異なる第２の点灯パターンで前記発光素子を点灯させる、請求の範囲第３項に記載のプロジェクター。     It further has a light emitting element,
    The controller is
    In the first state, when a video signal is detected by the signal detection unit, the switch is maintained in the first state, and the light emitting element is turned on with a first lighting pattern,
    In the second state, when a video signal is detected by the signal detection unit, the switch is maintained in the second state and the second lighting pattern is different from the first lighting pattern. The projector according to claim 3, wherein the light emitting element is turned on.
  5. 　前記映像出力端子として、第１および第２の映像出力端子を有し、
    　前記バッファとして、前記第１の映像出力端子に接続され、第１の映像信号を保持する第１のバッファと、前記第２の映像出力端子に接続され、前記第１の映像信号とは伝送方式の異なる第２の映像信号を保持する第２のバッファを有し、
    　前記制御部は、前記接続先装置が前記第１のバッファからの前記第１の映像信号を処理する状態に有ることを示す第１の起動状態である場合は、前記第１のバッファへの電力供給を行うとともに前記第２のバッファへの電力供給を停止し、前記接続先装置が前記第２のバッファからの前記第２の映像信号を処理する状態に有ることを示す第２の起動状態である場合には、前記第２のバッファへの電力供給を行うとともに前記第１のバッファへの電力供給を停止する、請求の範囲第１項に記載のプロジェクター。     As the video output terminal, it has first and second video output terminals,
    A first buffer that is connected to the first video output terminal and holds the first video signal, and a second video output terminal that is connected to the first video output terminal, and the first video signal is a transmission method. Having a second buffer for holding different second video signals,
    When the control unit is in a first activation state indicating that the connection destination device is in a state of processing the first video signal from the first buffer, the control unit supplies power to the first buffer. In a second start-up state that indicates that the connection destination device is in a state of processing the second video signal from the second buffer, while supplying power and stopping the power supply to the second buffer. 2. The projector according to claim 1, wherein in some cases, power is supplied to the second buffer and power supply to the first buffer is stopped.
  6. 　前記第１の映像信号が供給される第１および第２の映像入力端子と、
    　前記第２の映像信号が供給される第３および第４の映像入力端子と、
    　前記第１の映像入力端子を介して入力される映像信号を第１の入力とし、前記第２の映像入力端子を介して入力される映像信号を第２の入力とし、これら入力のいずれかを選択して出力する第１のスイッチと、
    　前記第３の映像入力端子を介して入力される映像信号を第１の入力とし、前記第４の映像入力端子を介して入力される映像信号を第２の入力とし、これら入力のいずれかを選択して出力する第２のスイッチと、をさらに有し、
    　前記制御部は、
    　前記第１および第２のスイッチを制御するとともに、前記第１および第２のスイッチから映像信号が出力されるか否かを監視し、
    　前記第１のスイッチにて前記第１の入力を選択させた第１の状態および前記第１のスイッチにて前記第２の入力を選択させた第２の状態のそれぞれにおいて、前記第１のスイッチから映像信号が出力される状態を検出できない場合は、前記第１のバッファへの電力供給を停止し、
    　前記第２のスイッチにて前記第１の入力を選択させた第３の状態および前記第２のスイッチにて前記第２の入力を選択させた第４の状態のそれぞれにおいて、前記第２のスイッチから映像信号が出力される状態を検出できない場合は、前記第２のバッファへの電力供給を停止する、請求の範囲第５項に記載のプロジェクター。     First and second video input terminals to which the first video signal is supplied;
    Third and fourth video input terminals to which the second video signal is supplied;
    A video signal input via the first video input terminal is a first input, a video signal input via the second video input terminal is a second input, and any of these inputs is A first switch to select and output;
    A video signal input via the third video input terminal is a first input, a video signal input via the fourth video input terminal is a second input, and any of these inputs is A second switch for selecting and outputting,
    The controller is
    Controlling the first and second switches and monitoring whether a video signal is output from the first and second switches;
    In each of the first state in which the first input is selected by the first switch and the second state in which the second input is selected by the first switch, the first switch If the video signal output state cannot be detected, the power supply to the first buffer is stopped,
    In each of the third state in which the first input is selected by the second switch and the fourth state in which the second input is selected by the second switch, the second switch 6. The projector according to claim 5, wherein when the state in which the video signal is output from the second buffer cannot be detected, the power supply to the second buffer is stopped. 7.
  7. 　前記第１のスイッチの出力を入力とし、前記第１のスイッチから映像信号が供給されたか否かを判定する第１の信号検出部と、
    　前記第２のスイッチの出力を入力とし、前記第２のスイッチから映像信号が供給されたか否かを判定する第２の信号検出部とを、さらに有し、
    　前記制御部は、
    　自プロジェクターの主電源がオンとされ、電源がオフとされるスタンバイ状態において、前記接続先装置の状態が前記第１の起動状態にあることを検出した場合は、前記第１の信号検出部に電力を供給し、前記第１および第２の状態のいずれかにおいて、前記第１の信号検出部にて映像信号が検出されると、前記第１のバッファへの電力供給を行うとともに、前記第１の信号検出部への電力供給を停止し、
    　前記スタンバイ状態において、前記接続先装置の状態が前記第２の起動状態であることを検出した場合には、前記第２の信号検出部に電力を供給し、前記第３および第４の状態のいずれかにおいて、前記第２の信号検出部にて映像信号が検出されると、前記第２のバッファへの電力供給を行うとともに、前記第２の信号検出部への電力供給を停止する、請求の範囲第６項に記載のプロジェクター。     A first signal detector that receives the output of the first switch and determines whether a video signal is supplied from the first switch;
    A second signal detector that receives the output of the second switch and determines whether a video signal is supplied from the second switch;
    The controller is
    In the standby state in which the main power of the projector is turned on and the power is turned off, if it is detected that the state of the connection destination device is the first activation state, the first signal detection unit When power is supplied and a video signal is detected by the first signal detector in any of the first and second states, power is supplied to the first buffer and the first 1 stops the power supply to the signal detection unit,
    In the standby state, when it is detected that the state of the connection destination device is the second activation state, power is supplied to the second signal detection unit, and the third and fourth states are In any one of the above, when a video signal is detected by the second signal detection unit, power supply to the second buffer is performed and power supply to the second signal detection unit is stopped. The projector according to claim 6,
  8. 　点灯色と異なる第１および第２の発光素子をさらに有し、
    　前記制御部は、
    　前記第１の状態において、前記第１の信号検出部にて映像信号が検出された場合は、前記第１のスイッチを前記第１の状態で維持するとともに、第１の点灯パターンで前記第１の発光素子を点灯させ、
    　前記第２の状態において、前記第１の信号検出部にて映像信号が検出された場合は、前記第１のスイッチを前記第２の状態で維持するとともに、前記第１の点灯パターンとは異なる第２の点灯パターンで前記第１の発光素子を点灯させ、
    　前記第３の状態において、前記第２の信号検出部にて映像信号が検出された場合は、前記第２のスイッチを前記第３の状態で維持するとともに、第３の点灯パターンで前記第２の発光素子を点灯させ、
    　前記第４の状態において、前記第２の信号検出部にて映像信号が検出された場合は、前記第２のスイッチを前記第４の状態で維持するとともに、前記第３の点灯パターンとは異なる第４の点灯パターンで前記第２の発光素子を点灯させる、請求の範囲第７項に記載のプロジェクター。     It further includes first and second light emitting elements different from the lighting color,
    The controller is
    In the first state, when a video signal is detected by the first signal detection unit, the first switch is maintained in the first state and the first lighting pattern is used in the first lighting pattern. Turn on the light emitting element,
    In the second state, when a video signal is detected by the first signal detector, the first switch is maintained in the second state and is different from the first lighting pattern. Lighting the first light emitting element with a second lighting pattern;
    In the third state, when a video signal is detected by the second signal detection unit, the second switch is maintained in the third state and the second lighting pattern is used in the second lighting pattern. Turn on the light emitting element,
    In the fourth state, when a video signal is detected by the second signal detector, the second switch is maintained in the fourth state and is different from the third lighting pattern. The projector according to claim 7, wherein the second light emitting element is turned on with a fourth lighting pattern.
  9. 　映像出力端子および該映像出力端子に出力される映像信号を保持するバッファを備えたプロジェクターであって、
    　前記バッファから前記映像出力端子を介して出力された映像信号を用いた処理を行う接続先装置の動作状態を検出し、前記接続先装置の状態が前記映像信号を処理する状態に無いことを示すものである場合には、前記バッファへの電力供給を停止する、プロジェクターの電源制御方法。     A projector comprising a video output terminal and a buffer for holding a video signal output to the video output terminal,
    An operation state of a connection destination device that performs processing using a video signal output from the buffer via the video output terminal is detected, and indicates that the state of the connection destination device is not in a state of processing the video signal. If so, a power control method for the projector, wherein the power supply to the buffer is stopped.
PCT/JP2008/073700 2008-12-26 2008-12-26 Projector and method for power supply control WO2010073357A1 (en)

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JP2016006520A (en) * 2015-07-29 2016-01-14 キヤノン株式会社 Display control device and method of controlling the same

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