JP2016100664A - Image projection device, image projection system and control method for image projection device - Google Patents

Abstract

An object of the present invention is to avoid a state in which a light source of an image projection apparatus is turned on in a no-signal state when connecting to an external device that supplies power to the image projection apparatus during initialization processing or in a standby state. An image projection apparatus 1 that receives a video signal from a video supply device 110 connected via an HDMI cable 120 and projects an image, a sub-control unit 28 that is effective in a standby state, and a standby A main control unit 24 that is ineffective in the state and controlled by the sub-control unit 28 and drives the light source after the start-up, and the sub-control unit 28 detects the input of the 5V signal in the standby state In addition, after the power-on signal is output by the power-on signal output unit 29, the power-on signal output unit 29 outputs a power-on signal for shifting to the start state in which the video signal can be output to the video supply device 110. And a main control unit starting means 30 for starting the main control unit 24. [Selection] Figure 8

Description

  The present invention relates to an image projection apparatus, an image projection system, and a control method for the image projection apparatus.

  In the field of AV (Audio Visual) equipment such as a TV having a digital broadcast receiving function and a recording / playback device having a function of recording and playing a broadcast, video supply for outputting an image / video signal (hereinafter referred to as a video signal) A device (also referred to as an external device or a source device) and a video display device (also referred to as a sink device) that receives and displays a video signal are connected to a predetermined communication interface such as HDMI (High Definition Multimedia). Interface (registered trademark) standard cable (hereinafter referred to as HDMI cable) is the mainstream.

  In addition, the HDMI standard is widely adopted when video projected and output from a projection-type video display device such as a projector (hereinafter referred to as an image projection device) is transmitted from an information processing device such as a personal computer. The information processing device is a video supply device, and the image projection device is a sink machine.

  Here, when the image projection apparatus is in a standby state and is connected to an external device with a cable and receives a video signal in this state or a predetermined power source (for example, a 5V voltage signal) is supplied, the image is projected. A technique is known in which a change from the standby state to a power-on state is detected on the projection device side. When the image projection apparatus is turned on, a light source such as a lamp is turned on and an image is projected onto a projection surface such as a screen.

  Further, in Patent Document 1, it is determined whether or not the projection system is in a projectable state at the time when control information for notifying the start of input of a video signal is input from an external device, and is determined not to be in a projectable state. In such a case, an image output apparatus is disclosed that waits until the projection system is ready for projection, and requests an external device to output a video signal when the projection system is ready for projection. In this patent document 1, when the lamp of the projector is not lit, the information is transmitted to the external device side so that the video reproduction is not performed.

  However, external devices include devices that supply a predetermined power supply (5 V voltage) to the sink device, although they are in an initialization process immediately after the AC power is turned on or in a standby state. For this reason, when such an external device and the image projection device are connected, the image projection device transitions from the standby state to the power-on state, but the external device is in the standby state, and therefore outputs a video signal. Not done. Therefore, on the image projection apparatus side, although the light source is turned on, there is a problem that the image is projected onto the projection surface in a no-signal state where there is no video or the like to be projected.

Specifically, the following cases can be considered. As a premise, the external device and the image projection apparatus are connected by an HDMI cable, and the image projection apparatus is in a standby state.
(1) Some external devices supply power to the sink machine during initialization processing. That is, when the AC power supply of the external device is turned on, the external device starts an initialization process, and supplies 5V voltage during that time. When the initialization process ends, the standby state is entered and the supply of 5V voltage is stopped. In such an external device, immediately after the AC power supply of the external device is turned on, the image projection device detects a 5V voltage. Therefore, the image projection device transitions from the standby state to the power-on state and projects an image. However, when the initialization processing of the external device is completed and the state transitions to the standby state, there is no signal state and no image is projected.
(2) Some external devices supply power to the sink machine in a standby state. That is, when the AC power supply of the external device is turned on, the external device starts the initialization process, and when the initialization process ends, the external device transitions to the standby state and supplies 5V voltage. In such an external device, when the AC power supply of the external device is turned on, the image projection device detects a 5V voltage, so the image projection device transitions from the standby state to the power-on state and projects an image. However, since the external device does not output any video signal in the standby state, it becomes a no-signal state and no image is projected.

  Therefore, the present invention sets the image projection apparatus to the power-on state and connects the external apparatus to the external apparatus that supplies a predetermined power to the image projection apparatus during the initialization process immediately after the AC power is turned on or in the standby state. An object of the present invention is to provide an image projection apparatus that can also be activated.

  In order to achieve this object, an image projection apparatus according to the present invention receives a video signal from a video supply apparatus connected via a communication interface, and projects an image generated based on the video signal. A sub-control unit that is effective in the standby state of the image projection device, a main control unit that is ineffective in the standby state and is controlled by the sub-control unit to drive the light source after startup. The sub-control unit is in a start state capable of outputting the video signal to the video supply device connected via the communication interface when detecting an input of a predetermined voltage signal in the standby state. A power-on signal output means for outputting a power-on signal for shifting to the power supply, and after the output of the power-on signal by the power-on signal output means, A main control unit activating means for activating the section, but with a.

  According to the present invention, in the initialization process immediately after the AC power is turned on or in the standby state, when connecting to an external device that supplies a predetermined power to the image projection apparatus, the image projection apparatus is turned on and externally connected. The apparatus can also be activated to avoid a state in which the light source of the image projection apparatus is turned on in a no-signal state.

It is a schematic block diagram which shows an example of an image projection system. 1 is an external perspective view showing an embodiment of an image projection apparatus according to the present invention. It is the side view of an image projection apparatus, Comprising: It is the figure which showed the projection state to a to-be-projected surface. (A) The perspective view which shows the state which removed the exterior cover of the image projector, (B) It is an enlarged block diagram of the encircled part of (A). It is sectional drawing of an illumination unit, a projection unit, an image display element unit, and a light source unit. It is a functional block diagram of an image projection apparatus. It is explanatory drawing about the connection state of the image projection apparatus and external apparatus in an image projection system. It is explanatory drawing of the signal line in a sub control part and an HDMI cable. It is a flowchart which shows an example of the power supply control which an image projection apparatus performs. It is a flowchart which shows the other example of the power supply control which an image projection apparatus performs.

  Hereinafter, a configuration according to the present invention will be described in detail based on the embodiment shown in FIGS.

  The image projection apparatus according to the present embodiment receives a video signal from a video supply apparatus (video supply apparatus 110) connected via a communication interface (HDMI cable 120), and generates an image generated based on the video signal. An image projecting apparatus (image projecting apparatus 1) for projecting, which is effective in the standby state of the image projecting apparatus (sub-control unit 28) and invalid in the standby state, and is activated from the sub-control unit And a main control unit (main control unit 24) that drives the light source (lamp 15) after activation, and the sub-control unit detects an input of a predetermined voltage signal (5V signal) in the standby state. Sometimes, a power-on signal for shifting to a startup state (power-on state) in which a video signal can be output is output to a video supply device connected via a communication interface. A source-on signal output unit (power-on signal output unit 29) and a main control unit activation unit (main control unit activation unit 30) that activates the main control unit after the power-on signal is output by the power-on signal output unit. It is to be prepared. In addition, the code | symbol in embodiment and the example of application are shown in a parenthesis.

[Image projection system]
FIG. 1 is a schematic configuration diagram illustrating an example of an image projection system 100. The image projection system 100 includes an image projection device (projector) 1 and a video supply device 110 that supplies a video signal. The image projection device 1 and the video supply device 110 are connected by a cable 120. Has been. The video signal includes an image signal for displaying a still image.

  The image projection device 1 is a projector that generates a video based on video data provided by the video supply device 110 and projects it onto a projection surface such as a screen 130. In FIG. 1, a projection image 140 is projected on the screen 130 from the image projection apparatus 1.

  The image projection apparatus 1 has an HDMI (High-Definition Multimedia Interface) (registered trademark) terminal, a DisplayPort terminal, a Thunderbolt terminal, a VGA (Video Graphics Array) input terminal, an S-VIDEO terminal, and an RCA terminal as interfaces for inputting video signals. Etc. are provided. The image projection apparatus 1 preferably includes a plurality of image input terminals. A video signal is received from the video supply device 110 via the cable 120 connected to the image input terminal. The cable 120 is, for example, an HDMI cable.

  In addition, the image projection apparatus 1 may receive a video signal from the video supply apparatus 110 by wireless communication complying with a wireless communication protocol such as Bluetooth (registered trademark) or WiFi (registered trademark).

  The video supply device 110 is a device that provides an image to be projected by the image projection device 1. The video supply device 110 includes an interface that outputs a video signal, and the video signal forming the display image of the video supply device 110 is an image projection device at a predetermined transfer rate (for example, 30 fps (frame per second) to 60 fps). 1 to send.

  Similarly, the video supply device 110 includes image output terminals such as an HDMI terminal, a DisplayPort terminal, a Thunderbolt terminal, a VGA input terminal, an S-VIDEO terminal, and an RCA terminal as interfaces for outputting video signals. The image can be transmitted to the image projection apparatus 1 via the connected cable 120. The video supply device 110 may transmit a video signal to the image projection device 1 by wireless communication.

  As the video supply device 110, for example, an information processing device that can supply video signals such as a notebook PC, desktop PC, tablet PC, or PDA, or a playback device such as a DVD player or a Blu-ray player can be used. In the example shown in FIG. 1, one video supply device 110 is connected to the image projection device 1, but a plurality of video supply devices 110 may be connected to the image projection device 1.

[Image projection device]
(Constitution)
FIG. 2 is an external perspective view showing an embodiment of the image projection apparatus 1. FIG. 3 is a side view of the image projection apparatus 1 and shows a state of projection onto the screen 130 that is the projection surface.

  The image projection apparatus 1 includes a lamp as a light source and a large number of electronic boards inside the apparatus, and the internal temperature of the apparatus rises at startup. For this reason, the image projection apparatus 1 is provided with an intake port 11 and an exhaust port 12 so that internal components do not exceed the heat-resistant temperature.

  FIG. 4A is a perspective view showing a state in which the exterior cover 2 of the image projection apparatus 1 is removed. FIG. 4B is an enlarged configuration diagram of the optical engine 3 and the light source unit 4 indicated by a circled portion in FIG. As shown in FIG. 4, the image projection apparatus 1 includes an optical engine 3 and a light source unit 4. FIG. 5 is a cross-sectional view of the illumination unit 3 a (illumination optical system), the projection unit 3 b (projection optical system), the image display element unit 10, and the light source unit 4, which are illumination devices. The optical engine 3 includes an illumination unit 3a and a projection unit 3b.

  As shown in FIG. 4, an intake fan 13 and an exhaust fan 14 are provided inside the intake port 11 and the exhaust port 12, respectively, and by discharging outside air sucked from the intake fan 13 from the exhaust fan 14, Air cooling by forced air flow in the apparatus is performed.

  In the image projection apparatus 1, light (white light) from the light source of the light source unit 4 is irradiated to the illumination unit 3 a of the optical engine 3. In the illumination unit 3a, after irradiating the emitted white light into RGB, it is guided to the image display element unit 10 by a lens, a mirror, etc., and the image display element unit 10 for forming an image according to the modulation signal and the image are projected onto the projection unit. 3b is enlarged and projected onto the screen 130.

  Various lamps can be used as the lamp 15 that is the light source of the light source unit 4. For example, an arc lamp such as a high-pressure mercury lamp or a xenon lamp can be used. For example, it is preferable to use a high-pressure mercury lamp.

  Further, one cooling fan 16 as a light source cooling unit is provided on one side of the side surface of the light source unit 4. The rotation speed of the cooling fan 16 is controlled so that each part of the light source unit 4 has a temperature within a set rated temperature range. Further, the emission direction of the light from the light source unit 4 and the emission direction of the image light from the projection unit 3b are approximately 90 ° as shown in FIG.

  The illumination unit 3a of the optical engine 3 includes a color wheel 5 (rotational color filter) that splits light emitted from the light source, a light tunnel 6 that guides light emitted from the color wheel 5, a relay lens 7, and a plane mirror. 8 and a concave mirror 9. An image display element unit 10 is provided in the illumination unit 3a.

  In the illumination unit 3a, first, white light, which is emitted light from the light source, is converted into light that repeats RGB colors per unit time by the disk-shaped color wheel 5 and emitted. The color-separated light emitted from the color wheel 5 is guided to the light tunnel 6. The light tunnel 6 is an illumination uniform conversion optical member that makes incident light uniform by being reflected and combined multiple times inside (inner wall).

  Next, the light emitted from the light tunnel 6 is condensed by correcting a longitudinal chromatic aberration of the light by a relay lens 7 formed by combining two lenses. Further, the light emitted from the relay lens 7 is reflected by the flat mirror 8 and the concave mirror 9 and is condensed on the image display element unit 10. The image display element unit 10 has a substantially rectangular mirror surface composed of a plurality of micromirrors, and each micromirror is driven in a time-sharing manner based on image data, so that projection light is generated so as to form a predetermined image. A DMD element 10a is provided as an image display element (light modulation element) that is processed and reflected.

  The image display element unit 10 selects the light that is output to the projection unit by switching on and off of the micromirror according to the input signal, and expresses the gradation. That is, by the DMD element 10a, the light used by the plurality of micromirrors is reflected to the projection lens and the discarded light is reflected to the OFF light plate based on the image data in a time division manner. The light used in the image display element unit 10 is reflected to the projection unit 3b, and the image light enlarged through the plurality of projection lenses in the projection unit 3b is enlarged and projected onto the screen 130.

  FIG. 6 shows a functional block diagram of the image projection apparatus 1. The image projection apparatus 1 includes an image input terminal 21, a video processing unit 22, a scale processing unit 23, a main control unit 24 (main), a memory 25, an operation unit 26, a drive circuit 27, and a sub control unit. 28 (sub), an image display element unit 10, a lamp 15, and a projection optical system 3b.

  The image input terminal 21 is a video signal input unit to which a video signal is input from an external device, and is an HDMI input terminal in the present embodiment. In addition, a VGA terminal, a video terminal, and the like are provided.

  The video processing unit 22 receives a video signal from an external device input from the image input terminal 21, performs various processes such as serial-parallel conversion and voltage level conversion on the video signal, and receives the scale processing unit 23. Can be converted into a video signal (video digital signal).

  A video digital signal output from the video processing unit 22 is input to the scale processing unit 23. The scale processing unit 23 determines the number of vertical and horizontal pixels from the timing of the video signal, and performs scaling so that the input video is optimally displayed with respect to the aspect ratio of the number of output pixels of the image projection apparatus 1.

  The main control unit 24 is constituted by a microcontroller, and includes arithmetic circuits such as a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), and a storage circuit. The main control unit 24 performs overall control of the image projection apparatus 1 and performs control for performing various settings and comparisons.

  The memory 25 is a storage unit that stores various image processing programs, setting values set by the main control unit 24, and the main control unit 24 performs various types of processing based on the image processing programs stored in the memory 25. Execute the process. As the memory 25, for example, various nonvolatile semiconductor memories such as an EPROM, an EEPROM, and a flash memory can be adopted, and setting contents (language setting, etc.) are stored even after the power is turned off.

  The operation unit 26 receives various operation requests from the user, and includes a key button (main body key) provided on the outer surface of the image projection apparatus 1 or a key input unit of a remote control transmitter. For example, a menu key for displaying a menu screen for performing various settings and selections of the projector is provided.

  The operation request includes an instruction to display an OSD screen such as a menu screen, a request to change the aspect ratio of the projected image, a request to turn off the power of the image projection apparatus 1, a lamp power change request to change the light amount of the lamp 15, Etc. are included. When the operation unit 26 receives the operation request, the operation unit 26 notifies the main control unit 24 of the operation request.

  The scaled video signal and its synchronization signal are input from the scale processing unit 23 to the drive circuit 27, and the drive circuit 27 drives the image display element (DMD element 10 a) of the image display element unit 10. The image display element unit 10 displays the scaled video, and modulates the light from the lamp 15 by the video. The image light from the image display element unit 10 is enlarged and projected on the screen 130 by the projection unit 3b.

  In the present embodiment, it is assumed that the video supply device 110 that is an external device and the image projection device 1 are connected by an HDMI cable. The HDMI cable includes a TMDS (Transition Minimized Differential Signaling) channel, a DDC (Display Data Channel) line, a CEC (Consumer Electronics Control) line, an HPD (Hot Plug Detect) line, and a 5V line. Here, the CEC line communicates a CEC signal for realizing a cooperative operation between devices, and the 5V line transmits a 5V signal for an external device to supply 5V power to the image projection apparatus 1. To communicate.

  The CEC signal and 5V signal input from the external device via the image input terminal 21 are input to the sub-control unit 28. The sub-control unit 28 includes a microcontroller and functions as an HDMI receiver. The sub-control unit 28 performs connection detection with an external device and activation control of the image projection apparatus 1.

  Here, in order to reduce power consumption during standby, the image projection apparatus 1 is configured such that no power is supplied except for the sub-control unit 28 in the standby state, and the sub-control unit 28 projects the image in the standby state. The apparatus 1 is controlled. Thus, in the standby state, the sub-control unit 28 is in an effective state in which power is supplied, and the main control unit 24 is in an ineffective state in which no power is supplied.

(Connection with external equipment)
FIG. 7 is an explanatory diagram of a connection state between the image projection apparatus 1 and an external device in the image projection system 100. Here, a case where the image projection apparatus 1 is connected to a DVD player as the video supply apparatus 110 via the HDMI cable 120 is taken as an example.

  The image projection apparatus 1 is connected to an AC outlet 50 and an AC power cable 51 and is in a standby state. That is, as described above, the power is supplied only to the sub-control unit 28, and the operation is stopped, and the power is not supplied to the other parts and is stopped. The power consumption of the image projection apparatus 1 is in a minimum state. The power-on state of the image projection apparatus 1 refers to a state where the main control unit 24 is activated.

When the video supply device 110 connects the AC power cable 151 to the AC outlet 150, the video supply device 110 is turned on and an internal initialization process is performed. At this time, one of the following cases occurs.
(Case 1) A state where a standby state is entered after the initialization process, and no video signal is output and only a 5V signal is output.
(Case 2) A state in which the power is turned on after the initialization process and a video signal and a 5V signal are being output.
(Case 3) There is also a device that outputs a 5V signal in the initialization process.
Note that the power-on state of the video supply device 110 means that the video supply device 110 is in an activated state in which a video signal can be output.

  FIG. 8 is a functional block diagram of the image projection system 100 in a connection state between the image projection apparatus 1 and an external device, and is an explanatory diagram of details of the sub-control unit 28 and signal lines in the HDMI cable 120.

  The sub-control unit 28 outputs a power-on signal output unit 29 that transmits a power-on command (power-on signal) to the video supply device 110 and a control signal for starting the main control unit 24 via the CEC line 122. Main control unit starting means 30 for performing the above and a status confirmation signal output means 31 for transmitting a status confirmation command (status confirmation signal) to the video supply device 110 via the CEC line 122.

  The 5V signal is output from the control unit 112 of the video supply device 110 and is connected to the sub-control unit 28 via the image output terminal 111 (HDMI output terminal), the 5V line 121, and the image input terminal 21 of the image projection device 1. ing. The sub-control unit 28 detects input of a 5V signal.

  The CEC signal is transmitted and received between the control unit 112 and the sub control unit 28 of the video supply device 110 via the image output terminal 111, the CEC line 122, and the image input terminal 21. For example, a power-on command, status information command, or the like is transmitted from the sub-control unit 28 to the control unit 112, a response to the power-on command, a response to the status information command, a power-on command, or the like from the control unit 112 to the sub-control unit 28 Etc. are sent.

  The video signal is output from the video processing unit 113 of the video supply device 110 and is received by the video processing unit 22 via the image output terminal 111, the video signal line 123 (TMDS channel), and the image input terminal 21. A signal is sent to

  In this image projection system 100, when the video supply device 110 is connected to an AC power source and outputs 5 V, the sub-control unit 28 detects this, and then transmits and receives signals to and from the video supply device 110 via the CEC line 122. And a control signal for starting the image projection apparatus 1 is output to the main control unit 24 under a predetermined condition. Then, the image projection apparatus 1 turns on the lamp and projects the input video.

(Power control)
FIG. 9 is a flowchart illustrating an example of power control executed by the image projection apparatus 1 according to the present embodiment.

  The image projection apparatus 1 is in a standby state (S101). The image projection apparatus 1 in the standby state waits for input of a predetermined signal or operation from the operation unit 26 (S102).

  Here, when the sub-control unit 28 detects the 5V signal output from the video supply device 110 (S103: Y), the power-on signal output means 29 of the sub-control unit 28 is connected to the video supply device via the CEC line 122. A power-on command is sent to 110 to instruct power-on (S104).

  Next, when there is a power-on command response from the video supply device 110 (S105: Y), that is, when there is a response that the video supply device 110 is ready to output a video signal, the sub-control The main control unit activation means 30 of the unit 28 outputs a control signal for activating the main control unit 24 to activate the main control unit 24. Receiving this, the main control unit 24 turns on the image projection apparatus 1 and starts lighting the lamp 15 (S106).

  On the other hand, when there is no response from the video supply device 110 (S105: N), the image projection device 1 maintains the standby state (S107). When a power-on command is received from the video supply device 110 via the CEC line 122 in the standby state (S108: Y), the control unit 24 is activated to turn on the image projection device 1 and start the lamp 15 to be lit. (S106). If no power-on command is received from the video supply device 110 (S108: N), the standby state is maintained (S109).

  According to the image projection apparatus 1 according to the present embodiment described above, an external device that supplies a predetermined power to the sink machine during the initialization process immediately after the AC power is turned on or in the standby state (any of the above cases 1 to 3). When the AC power cable 151 of the video supply device 110 is inserted into the AC outlet 150 when the image projection device 1 is connected to the image projection device 1, the standby image projection device 1 is turned on. In addition, the video supply device 110 can also be in an activated state capable of outputting a video signal. Therefore, the lamp 15 does not turn on in the no-signal state.

  Therefore, for example, in digital signage or the like, it is possible to provide an image projection apparatus 1 suitable for automatically managing the image projection system 100 by controlling the power supply of the video supply apparatus 110.

[Second Embodiment]
Hereinafter, other embodiments of the image projection apparatus according to the present invention will be described. In addition, the description about the same point as the said embodiment is abbreviate | omitted suitably. In the image projection apparatus (image projection apparatus 1) according to the present embodiment, when the sub control unit (sub control unit 28) detects the input of the voltage signal (5V signal) in the standby state, the state of the video supply device is changed. It further includes status confirmation signal output means (status confirmation signal output means 31) for outputting a status confirmation signal to be confirmed to the video supply device, and the power-on signal output means (power-on signal output means 29) is a response to the status confirmation signal. When receiving a response to the effect that the video supply device is in a standby state, a power-on signal is output to the video supply device. In addition, the code | symbol in embodiment and the example of application are shown in a parenthesis.

  FIG. 10 is a flowchart illustrating another example of power control executed by the image projection apparatus 1 according to the present embodiment.

  The image projection apparatus 1 is in a standby state (S201). The image projection apparatus 1 in the standby state waits for input of a predetermined signal or operation from the operation unit 26 (S202).

  Here, when the sub-control unit 28 detects the 5V signal output from the video supply device 110 (S203: Y), the status confirmation signal output means 31 of the sub-control unit 28 passes the CEC line 122 through the video supply device. The status information of the video supply device 110 is requested by transmitting a status confirmation command to 110 (S204).

  When a status information response is received from the video supply device 110 in response to the status confirmation command (S205: Y), the sub-control unit 28 determines the status information (S206). Here, when the status of the video supply device 110 is the power-on state (S206: power-on state), the main control unit activation means 30 of the sub-control unit 28 outputs a control signal for activating the main control unit 24. To output and activate the main control unit 24. Receiving this, the main control unit 24 turns on the image projection apparatus 1 and starts lighting the lamp 15 (S207).

  On the other hand, when the status of the video supply device 110 is in the standby state (S206: standby state), the power-on signal output means 29 of the sub-control unit 28 sends a power-on command to the video supply device 110 via the CEC line 122. To turn on the power (S208).

  Next, when there is a response to the power-on command from the video supply device 110 (S209: Y), the main control unit activation means 30 activates the main control unit 24 to set the image projection device 1 in the power-on state. The lighting of the lamp 15 is started (S207). On the other hand, when there is no response from the video supply device 110 (S209: N), the image projection device 1 maintains the standby state (S210).

  Even when there is no response to the status information acquisition command from the video supply device 110 (S205: N), the image projection device 1 maintains the standby state (S210).

  In the standby state, when a power-on command is received from the video supply device 110 via the CEC line 122 (S211: Y), the control unit 24 is activated to turn on the image projection device 1 and start lighting the lamp 15. (S207). If no power-on command is received from the video supply device 110 (S211: N), the standby state is maintained (S212).

  According to the image projection apparatus 1 according to the present embodiment described above, an external device that supplies a predetermined power to the sink machine during the initialization process immediately after the AC power is turned on or in the standby state (any of the above cases 1 to 3). When the AC power cable 151 of the video supply device 110 is inserted into the AC outlet 150, the status state on the external device side is checked, When the device side is in a standby state, an instruction is given to turn on the power, the external device side is turned on (in a start-up state capable of outputting a video signal), and the image projection apparatus 1 side can also be turned on.

  The above-described embodiment is a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention.

  For example, in the above-described embodiment, the image projection apparatus 1 has been described by taking a DLP (Digital Light Processing) type projector as an example. However, the present invention is not limited to this, but the LCD (Liquid Crystal Display) type, LCOS (Liquid crystal on silicon) method or the like. Moreover, although the example which uses an arc lamp as a light source was demonstrated, it is not restricted to this, You may use a laser, LED, etc.

  In addition, each unit of the power-on signal output unit 29, the main control unit activation unit 30, and the status confirmation signal output unit 31 of the image projection apparatus 1 causes software (control program) to be executed by a CPU included in the sub control unit 28, for example. Can be configured.

DESCRIPTION OF SYMBOLS 1 Image projection apparatus 2 Exterior cover 3 Optical engine 3a Illumination unit 3b Projection unit 4 Light source unit 5 Color wheel 6 Light tunnel 7 Relay lens 8 Plane mirror 9 Concave mirror 10 Image display element unit 10a DMD element 11 Intake port 12 Exhaust port 13 Intake Fan 14 Exhaust fan 15 Lamp 16 Fan 21 Image input terminal 22 Video processing unit 23 Scale processing unit 24 Main control unit 25 Memory 26 Operation unit 27 Drive circuit 28 Sub control unit 29 Power-on signal output unit 30 Main control unit activation unit 31 Status Confirmation signal output means 50 AC outlet 51 AC power cable 100 Image projection system 110 Video supply device (external device)
111 Image output terminal 112 Control unit 113 Video processing unit 120 Cable (HDMI cable)
121 5V line 122 CEC line 123 Video signal line 130 Screen (projected surface)
140 Projected image 150 AC outlet 151 AC power cable

JP 2014-41364 A

Claims (7)

An image projection device that receives a video signal from a video supply device connected via a communication interface and projects an image generated based on the video signal,
A sub-control unit effective in a standby state of the image projection device;
A main control unit that is ineffective in the standby state and is controlled by the sub-control unit to drive the light source after startup, and
The sub-control unit
When an input of a predetermined voltage signal is detected in the standby state, a power-on signal is output to shift the video supply device connected by the communication interface to a startup state in which the video signal can be output. Power on signal output means for
An image projection apparatus comprising: a main control unit activation unit that activates the main control unit after the power-on signal is output by the power-on signal output unit. The sub-control unit
A status confirmation signal output means for outputting a status confirmation signal for confirming the state of the video supply device to the video supply device when the input of the voltage signal is detected in the standby state;
The power-on signal output means outputs the power-on signal to the video supply device when receiving a response that the video supply device is in a standby state as a response to the status confirmation signal. The image projection apparatus according to claim 1.   The image projection apparatus according to claim 1, wherein the main control unit starting unit starts the main control unit when receiving a response to the power-on signal from the video supply device.   3. The main control unit activation unit activates the main control unit when receiving a response that the video supply device is in the activated state as a response to the status confirmation signal. The image projection apparatus described.   The image projection apparatus according to claim 1, wherein the communication interface is HDMI (High Definition Multimedia Interface). An image projection device according to any one of claims 1 to 5,
The video supply device;
Are connected via the communication interface. A control method for an image projection device that receives a video signal from a video supply device connected via a communication interface and projects an image generated based on the video signal,
The image projection apparatus includes a sub-control unit that is effective in a standby state;
A main control unit that is ineffective in the standby state and is controlled by the sub-control unit to drive the light source after startup, and
In the sub-control unit,
When an input of a predetermined voltage signal is detected in the standby state, a power-on signal is output to shift the video supply device connected by the communication interface to a startup state in which the video signal can be output. Power on signal output processing to
A control method for an image projection apparatus, comprising: a main control unit starting process for starting the main control unit after the power-on signal is output by the power-on signal output means.