JP2015159523A - Projector, display device, projection system, and control method of projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a function to project light to detect an indication position to a display device without impairing convenience.SOLUTION: A projector 10 includes: a projection part 20 that displays images on a screen SC; a connection part 49 that has a light emission device 60 emitting detection light for position detection wire-connected along the screen SC; a position detection part 50 that uses the detection light to detect operations to the screen SC; an emission device driving part 48 that supplies power to the light emission device 60 via the connection part 49; and an emission control part 33 that stops the supply of power from the emission device driving part 48 to the connection part 49 when the light emission device 60 is not connected to the connection part 49.

Description

  The present invention relates to a projector, a display device, a projection system, and a projector control method.

  Conventionally, a display device such as a projector that projects an image on a screen is known (see, for example, Patent Document 1). Conventionally, there has been known a light-shielding type coordinate input device that detects an indicated position by projecting light onto a coordinate input area for detecting an instruction input and detecting reflected light (see, for example, Patent Document 2).

JP 2004-21218 A JP 2008-52366 A

It is conceivable to use the coordinate input device connected to the projector described in Patent Document 1, for example. By the way, when a device that emits light, such as the coordinate input device described above, is connected to another device and used, if the device on the connection side and the device on the connected side receive power, the effect of the inrush current There is a possibility that a large load is applied to the apparatus due to the sudden start of light emission. In order to prevent such a situation, it may be configured not to transfer power between the connection side and the connected side devices, or both the connection side and the connected side devices may be stopped and connected. It is expected to impair convenience.
The present invention has been made in view of the above-described circumstances, and an object thereof is to equip a display device with a function of detecting an indication position by performing light projection without impairing convenience.

In order to achieve the above object, the present invention provides a projection unit that displays an image on a projection surface, a connection unit in which a light emitting unit that emits detection light for position detection along the projection surface is connected by wire, A detection unit that detects an operation on the projection surface using the detection light, a drive unit that supplies power to the light emission unit via the connection unit, and the light emission unit connected to the connection unit. And an emission control unit that stops power supply from the drive unit to the connection unit when there is not.
According to the present invention, it is possible to prevent the occurrence of inrush current when the light emitting unit is connected to the projector and the influence caused by sudden light emission. For this reason, the structure which supplies electric power to a light-projection part from a projector can be employ | adopted, and when connecting or removing a light-projection part, it is not necessary to stop a projector. Therefore, the projector can be provided with a function of detecting the designated position using light without impairing convenience.

In the projector according to the aspect of the invention, when the light emission control unit determines that the light emission unit has changed from a state connected to the connection unit to a non-connection state, the drive unit moves to the connection unit. The power supply is stopped.
According to the present invention, it is possible to prevent a sudden change in the power supply state of the projector when the light emitting unit is removed. Further, it is possible to prevent a load due to an inrush current or the like when the light emitting unit is connected again.

In the projector according to the aspect of the invention, the emission control unit may stop power supply from the driving unit to the connection unit when it is not detected that the light emission unit is connected to the connection unit. It is characterized by.
According to the present invention, when the light emitting unit is connected during the operation of the projector, it is possible to prevent a load due to an inrush current or the like.

In the projector according to the aspect of the invention, the connection unit may be connected to the light emitting unit by a cable having at least a power supply line, a control signal line, and a connection detection line, and the power supply line and the control signal. A line and a terminal connected to each of the connection detection lines, and the emission control unit is connected to the power supply line when the light emission unit is not connected to the connection unit. The power supply to is stopped.
According to the present invention, it is possible to quickly detect the connection state between the projector and the light emitting unit.

In the projector according to the aspect of the invention, the detection unit may include a reflected light detection function for detecting reflected light reflected from the first indicator by the detection light emitted from the light emission unit. A setting unit configured to set use and non-use of the reflected light detection function, and when the setting unit sets non-use of the reflected light detection function, the emission control unit connects the connection unit to the connection unit. The power supply to the unit is stopped.
According to the present invention, when the projector is set not to use the function of the light emitting unit, it is possible to stop power supply and reduce power consumption.

In order to achieve the above object, in the display device of the present invention, a display unit that displays an image on a display surface and a light emitting unit that emits detection light for position detection along the display surface are wired. A connecting portion, a detecting portion that detects an operation on the display surface using the detection light, a driving portion that supplies power to the light emitting portion via the connecting portion, and the light emission to the connecting portion. And an emission control unit that stops power supply from the drive unit to the connection unit when the unit is not connected.
ADVANTAGE OF THE INVENTION According to this invention, the influence by generation | occurrence | production of an inrush current at the time of connecting a light-emitting device to a display apparatus, or sudden light emission can be prevented. For this reason, the structure which supplies electric power to a light-emitting device from a display apparatus can be employ | adopted, and when connecting or removing a light-emitting device, it is not necessary to stop a display apparatus. Therefore, the display device can be provided with a function of detecting the designated position using light without impairing convenience.

In order to achieve the above object, a projection system according to the present invention includes a projector that displays an image on a projection surface, and a light emitting device that is connected to the projector and emits detection light along the projection surface. The projector includes: a projection unit that displays the image; a connection unit to which the light emitting device is wired; a detection unit that detects an operation on the projection surface using the detection light; and the connection unit A drive unit that supplies power to the light emitting device via, and when the light emitting device is not connected to the connection unit, stopping power supply from the drive unit to the connection unit, It is characterized by.
According to the present invention, it is possible to prevent the occurrence of inrush current when the light emitting device is connected to the projector and the influence caused by sudden light emission. For this reason, the structure which supplies electric power to a light-projection apparatus from a projector can be employ | adopted, and when a light-projection apparatus is connected or removed, it is not necessary to stop a projector. Therefore, the projector can be provided with a function of detecting the designated position using light without impairing convenience.

In order to achieve the above object, the present invention provides a projector control method for displaying an image on a projection surface, wherein the light emitting unit for emitting detection light for position detection along the projection surface includes: Connected to a connection part of the projector, supplies power to the light emitting part via the connection part, and supplies power from the connection part when the light emitting part is not connected to the connection part of the projector. It is characterized by stopping.
According to the present invention, it is possible to prevent the occurrence of inrush current when the light emitting unit is connected to the projector and the influence caused by sudden light emission. For this reason, the structure which supplies electric power to a light-projection part from a projector can be employ | adopted, and when connecting or removing a light-projection part, it is not necessary to stop a projector. Therefore, the projector can be provided with a function of detecting the designated position using light without impairing convenience.

  According to the present invention, it is possible to provide a display device with a function of detecting a pointing position using light without impairing convenience.

1 is a schematic configuration diagram of a projection system according to an embodiment. It is a functional block diagram of a projection system. It is a principal part block diagram of a projector and a light-emitting device. It is a flowchart which shows operation | movement of a projector. It is a principal part block diagram of the projector and light-projection apparatus which concern on a 1st modification. It is a principal part block diagram of the projector and light-projection apparatus which concern on a 2nd modification. It is a principal part block diagram of the projector and light-projection apparatus which concern on a 3rd modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a projection system 1 according to an embodiment to which the present invention is applied. The projection system 1 includes a projector 10 installed above a screen SC (projection surface, display surface), and a light emitting device 60 (light emitting unit) installed above the screen SC.

  The projector 10 is a display device that is installed directly above or diagonally above the screen SC and projects an image toward the screen SC diagonally below. Further, the screen SC exemplified in the present embodiment is a flat plate or a curtain fixed to a wall surface or standing on a floor surface. The present invention is not limited to this example, and the wall surface can be used as the screen SC. In this case, the projector 10 and the light emitting device 60 may be attached to the upper part of the wall surface used as the screen SC.

The projector 10 is connected to an external image supply device such as a PC (personal computer), a video reproduction device, a DVD reproduction device, and the like, and an image is displayed on the screen SC based on an analog image signal or digital image data supplied from the image supply device. Project. The projector 10 may be configured to read out image data stored in a built-in storage unit 110 (FIG. 2) or an externally connected storage medium and display an image on the screen SC based on the image data.
The light emitting device 60 includes a light source unit 61 (FIG. 2) that is a solid light source, and diffuses (emits) light emitted from the light source unit 61 (infrared light in the present embodiment) along the screen SC. . The emission range of the light emitting device 60 is shown in FIG. The light emitting device 60 is installed above the upper end of the screen SC and emits light downward in the range of the angle θ, and this light forms a layer of light along the screen SC. In this embodiment, the angle θ reaches approximately 180 degrees, and a light layer is formed on almost the entire screen SC. The surface of the screen SC and the light layer are preferably close to each other. In this embodiment, the distance between the surface of the screen SC and the light layer is approximately in the range of 10 mm to 1 mm.

The projection system 1 detects the indicated position by the projector 10 when an instruction operation is performed on the screen SC.
A pen-type indicator 70 can be used as the indicator used for the instruction operation. Since the distal end portion 71 of the indicator 70 incorporates an operation switch 75 (FIG. 2) that operates when pressed, the operation switch 75 is turned on when the distal end portion 71 is pressed against the wall or the screen SC. become. The indicator 70 is operated so that the user holds the rod-shaped shaft portion 72 in his / her hand and brings the tip portion 71 into contact with the screen SC, and an operation of pressing the tip portion 71 against the screen SC is also performed. The distal end portion 71 includes a transmission / reception unit 74 (FIG. 2) that emits infrared light. The projector 10 detects the position of the distal end portion 71 as the indication position based on the infrared light emitted from the indicator 70.

Further, when a position indicating operation is performed with the indicator 80 that is a user's finger, the user brings the finger into contact with the screen SC. In this case, the position where the indicator 80 contacts the screen SC is detected.
That is, when the tip (for example, fingertip) of the indicator 80 contacts the screen SC, the light layer formed by the light emitting device 60 is blocked. At this time, the light emitted from the light emitting device 60 strikes and reflects the indicator 80, and part of the reflected light travels from the indicator 80 toward the projector 10. Since the projector 10 has a function of detecting light from the screen SC side, that is, light from below by the position detection unit 50 described later, the reflected light of the indicator 80 can be detected. The projector 10 detects an instruction operation on the screen SC by the indicator 80 by detecting the reflected light reflected by the indicator 80. Further, the projector 10 detects the indicated position indicated by the indicator 80.
Since the light layer emitted from the light emitting device 60 is close to the screen SC, the position where the light is reflected by the indicator 80 can be regarded as the tip closest to the screen SC or the indication position. For this reason, the indicated position can be specified based on the reflected light of the indicator 80.

The projection system 1 functions as an interactive whiteboard system, detects an instruction operation performed by the operator using the indicators 70 and 80, and reflects the indicated position on the projection image.
Specifically, the projection system 1 performs a process of drawing a graphic or placing a character or a symbol at a designated position, a process of drawing a graphic along the locus of the designated position, a drawn figure, a placed character or symbol The process etc. which erase | eliminate are performed. In addition, graphics drawn on the screen SC, arranged characters or symbols can be stored as image data, and can be output to an external device.
Further, it may operate as a pointing device by detecting the designated position, and output the coordinates of the designated position in the image projection area where the projector 10 projects an image on the screen SC. Further, a GUI (Graphical User Interface) operation may be performed using these coordinates.

FIG. 2 is a functional block diagram of each part constituting the projection system 1.
The projector 10 includes an I / F (interface) unit 11 and an image I / F (interface) unit 12 as interfaces connected to external devices. The I / F unit 11 and the image I / F unit 12 may include a connector for wired connection, and may include an interface circuit corresponding to the connector. The I / F unit 11 and the image I / F unit 12 may include a wireless communication interface. Examples of the connector and interface circuit for wired connection include those based on wired LAN, IEEE 1394, USB, and the like. Examples of the wireless communication interface include those that comply with a wireless LAN, Bluetooth (registered trademark), or the like. The image I / F unit 12 may be an image data interface such as an HDMI (registered trademark) interface. The image I / F unit 12 may include an interface through which audio data is input.

The I / F unit 11 is an interface that transmits and receives various data to and from an external device such as a PC. The I / F unit 11 inputs and outputs control data related to image projection, setting data for setting the operation of the projector 10, coordinate data of the designated position detected by the projector 10, and the like. The control unit 30 described later has a function of transmitting / receiving data to / from an external device via the I / F unit 11.
The image I / F unit 12 is an interface through which digital image data is input. The projector 10 of the present embodiment projects an image based on digital image data input via the image I / F unit 12. The projector 10 may have a function of projecting an image based on the analog image signal. In this case, the image I / F unit 12 converts the analog image signal into digital image data and an analog image interface. And an A / D conversion circuit.

The projector 10 includes a projection unit 20 (display unit) that forms an optical image. The projection unit 20 includes a light source unit 21, a light modulation device 22, and a projection optical system 23. The light source unit 21 includes a light source including a xenon lamp, an ultra high pressure mercury lamp, an LED (Light Emitting Diode), a laser light source, or the like. The light source unit 21 may include a reflector and an auxiliary reflector that guide light emitted from the light source to the light modulation device 22. Further, a lens group (not shown) for enhancing the optical characteristics of the projection light, a polarizing plate, or a dimming element that reduces the amount of light emitted from the light source on the path to the light modulation device 22 may be provided. Good.
The light modulation device 22 includes, for example, three transmissive liquid crystal panels corresponding to the three primary colors of RGB, and generates image light by modulating light transmitted through the liquid crystal panel. The light from the light source unit 21 is separated into three color lights of RGB, and each color light enters each corresponding liquid crystal panel. The color light modulated by passing through each liquid crystal panel is combined by a combining optical system such as a cross dichroic prism and emitted to the projection optical system 23.

  The projection optical system 23 includes a lens group that guides the image light modulated by the light modulation device 22 toward the screen SC and forms an image on the screen SC. Further, the projection optical system 23 may include a zoom mechanism for enlarging / reducing the projected image on the screen SC and adjusting the focus, and a focus adjusting mechanism for adjusting the focus. When the projector 10 is a short focus type, the projection optical system 23 may include a concave mirror that reflects image light toward the screen SC.

  The projection unit 20 is connected to a light source drive unit 45 that turns on the light source unit 21 according to the control of the control unit 30 and a light modulation device drive unit 46 that operates the light modulation device 22 according to the control of the control unit 30. The light source drive unit 45 may have a function of switching on / off the light source unit 21 and adjusting the light amount of the light source unit 21.

  The projector 10 includes an image processing system that processes an image projected by the projection unit 20. The image processing system includes a control unit 30 that controls the projector 10, a storage unit 110, an operation detection unit 17, an image processing unit 40, a light source driving unit 45, and a light modulation device driving unit 46. In addition, a frame memory 44 is connected to the image processing unit 40, and an attitude sensor 47, an emission device driving unit 48, and a position detection unit 50 are connected to the control unit 30. These units may be included in the image processing system.

  The control unit 30 controls each unit of the projector 10 by executing a predetermined control program 111. The storage unit 110 stores the control program 111 executed by the control unit 30 and the data processed by the control unit 30 in a nonvolatile manner. The storage unit 110 stores setting screen data 112 of a screen for setting the operation of the projector 10 and setting data 113 indicating the contents set using the setting screen data 112.

The image processing unit 40 processes the image data input via the image I / F unit 12 under the control of the control unit 30, and outputs an image signal to the light modulation device driving unit 46. The processing executed by the image processing unit 40 includes 3D (stereoscopic) image and 2D (planar) image discrimination processing, resolution conversion processing, frame rate conversion processing, distortion correction processing, digital zoom processing, color tone correction processing, luminance correction processing, and the like. is there. The image processing unit 40 executes processing designated by the control unit 30 and performs processing using parameters input from the control unit 30 as necessary. Of course, it is also possible to execute a combination of a plurality of processes.
The image processing unit 40 is connected to the frame memory 44. The image processing unit 40 expands the image data input from the image input I / F 12 in the frame memory 44, and executes the various processes described above on the expanded image data. The image processing unit 40 reads out the processed image data from the frame memory 44, generates R, G, B image signals corresponding to the image data, and outputs them to the light modulation device driving unit 46.
The light modulation device driving unit 46 is connected to the liquid crystal panel of the light modulation device 22. The light modulator driving unit 46 drives the liquid crystal panel based on the image signal input from the image processing unit 40 and draws an image on each liquid crystal panel.

The operation detection unit 17 is connected to the remote control light receiving unit 18 and the operation panel 19 that function as an input device, and detects an operation through the remote control light reception unit 18 and the operation panel 19.
The remote control light receiving unit 18 receives, by the remote control light receiving unit 18, an infrared signal transmitted in response to a button operation by a remote control (not shown) used by the operator of the projector 10. The remote control light receiving unit 18 decodes the infrared signal received from the remote control, generates operation data indicating the operation content on the remote control, and outputs the operation data to the control unit 30.
The operation panel 19 is provided in the exterior housing of the projector 10 and has various switches and indicator lamps. The operation detection unit 17 appropriately turns on and off the indicator lamp of the operation panel 19 according to the operation state and setting state of the projector 10 according to the control of the control unit 30. When the switch of the operation panel 19 is operated, operation data corresponding to the operated switch is output from the operation detection unit 17 to the control unit 30.

  The emission device drive unit 48 (drive unit) is connected to the light emission device 60 via the connection unit 49. The connection portion 49 is a connector having a plurality of pins, for example, and the light emitting device 60 is connected to the connection portion 49 via a cable 60a. The emission device driving unit 48 generates a pulse signal according to the control of the control unit 30 and outputs the pulse signal to the light emission device 60 via the connection unit 49. Further, the emission device driving unit 48 supplies power to the light emission device 60 through the connection unit 49.

  As shown in FIG. 1, the light emitting device 60 is configured by housing a light source unit 61 and optical components in a substantially box-shaped case. The light emitting device 60 of this embodiment includes a solid light source 62 (FIG. 3) that emits infrared light in the light source unit 61. The infrared light emitted from the solid light source 62 is diffused by the collimating lens and the Powell lens to form a surface along the screen SC. The light source unit 61 may include a plurality of solid light sources, and a light layer may be formed so as to cover the image projection range of the screen SC by diffusing light emitted from the plurality of solid light sources. The light emitting device 60 may include an adjustment mechanism that adjusts the distance and angle between the light layer emitted from the light source unit 61 and the screen SC.

The light emitting device 60 turns on the light source unit 61 with the pulse signal and power supplied from the emitting device driving unit 48. The emission device driving unit 48 controls the timing at which the light source unit 61 is turned on and off. The control unit 30 controls the emission device driving unit 48 to turn on the light source unit 61 in synchronization with the timing when the imaging unit 51 described later performs imaging.
The configurations of the emission device drive unit 48, the connection unit 49, and the light emission device 60 will be described later with reference to FIG.

The position detection unit 50 (detection unit) detects an operation on the screen SC by the indicators 70 and 80. The position detection unit 50 includes an imaging unit 51, a transmission unit 52, an imaging control unit 53, a pointer detection unit 54, and a coordinate calculation unit 55. The position detection unit 50 functions as an operation detection unit.
The imaging unit 51 includes an imaging optical system, an imaging element, an interface circuit, and the like, and images the projection direction of the projection optical system 23. The imaging optical system of the imaging unit 51 is arranged so as to face substantially the same direction as the projection optical system 23, and has an angle of view that covers a range in which the projection optical system 23 projects an image on the screen SC. Examples of the imaging device include a CCD and a CMOS that receive light in the infrared region and the visible light region. The imaging unit 51 may include a filter that blocks a part of the light incident on the imaging element. For example, when receiving infrared light, a filter that mainly transmits infrared light is provided in front of the imaging element. May be arranged. Further, the interface circuit of the imaging unit 51 reads and outputs the detection value of the imaging element.

  The imaging control unit 53 causes the imaging unit 51 to perform imaging and generates captured image data. When the imaging device performs imaging with visible light, an image projected on the screen SC is captured. This captured image is used for distortion correction processing for correcting, for example, trapezoidal distortion or pincushion distortion of the projected image. In addition, the imaging control unit 53 can capture infrared light by the imaging unit 51, and in this case, the captured image includes infrared light (infrared signal) emitted from the indicator 70 and reflection reflected by the indicator 80. Light is reflected.

The indicator detection unit 54 detects the indication positions of the indicators 70 and 80 based on the captured image data captured by the imaging control unit 53. The indicator detection unit 54 includes an infrared light image and / or indicator emitted by the indicator 70 from the captured image data when the imaging control unit 53 causes the imaging unit 51 to perform infrared imaging. An image of the reflected light reflected by 80 is detected. Further, the indicator detection unit 54 may determine whether the detected image is an image of light emitted from the indicator 70 or an image of reflected light from the indicator 80.
The coordinate calculation unit 55 calculates the coordinates of the pointing positions of the pointers 70 and 80 in the captured image data based on the position of the image detected by the pointer detection unit 54 and outputs the calculated coordinates to the control unit 30. The coordinate calculation unit 55 may also calculate the coordinates of the indication positions of the indicators 70 and 80 in the projection image projected by the projection unit 20 and output them to the control unit 30. Further, the coordinate calculation unit 55 is configured to display the coordinates of the pointing positions of the indicators 70 and 80 in the image data drawn by the image processing unit 40 in the frame memory 44 and the indicators 70 and 80 in the input image data of the image I / F unit 12. The coordinates of the designated position may be calculated.

  The transmission unit 52 transmits an infrared signal to the indicator 70 according to the control of the indicator detection unit 54. The transmission unit 52 has a light source such as an infrared LED, and turns on and off the light source according to the control of the indicator detection unit 54.

Moreover, the indicator 70 is provided with the control part 73, the transmission / reception part 74, the operation switch 75, and the power supply part 76, and these each part is accommodated in the axial part 72 (FIG. 1). The control unit 73 is connected to the transmission / reception unit 74 and the operation switch 75 and detects the on / off state of the operation switch 75. The transmission / reception unit 74 includes a light source such as an infrared LED and a light receiving element that receives infrared light. The transmission / reception unit 74 turns on and off the light source according to the control of the control unit 73, and transmits a signal indicating a light receiving state of the light receiving element. To 73.
The power supply unit 76 includes a dry battery or a secondary battery as a power supply, and supplies power to the control unit 73, the transmission / reception unit 74, and the operation switch 75.
The indicator 70 may include a power switch that turns on / off the power supply from the power supply unit 76.

Here, a method of specifying the indicator 70 from the captured image data of the imaging unit 51 by mutual communication between the position detection unit 50 and the indicator 70 will be described.
When detecting the position pointing operation by the pointer 70, the control unit 30 controls the pointer detection unit 54 to transmit a synchronization signal from the transmission unit 52. That is, the indicator detection unit 54 turns on the light source of the transmission unit 52 at a predetermined period in accordance with the control of the control unit 30. The infrared light periodically emitted from the transmission unit 52 functions as a synchronization signal that synchronizes the position detection unit 50 and the indicator 70.
On the other hand, after the supply of power from the power supply unit 76 is started and a predetermined initialization operation is performed, the control unit 73 receives infrared light emitted from the transmission unit 52 of the projector 10 by the transmission / reception unit 74. When the transmission / reception unit 74 receives infrared light periodically generated by the transmission unit 52, the control unit 73 lights the light source of the transmission / reception unit 74 in a preset lighting pattern in synchronization with the timing of the infrared light. (Light emission). This lighting pattern represents data specific to the indicator 70 by turning on and off the light source corresponding to ON and OFF of the data. The control unit 73 turns on and off the light source in accordance with the set pattern turn-on time and turn-off time. The control unit 73 repeatedly executes the above pattern while power is supplied from the power supply unit 76.
That is, the position detection unit 50 periodically transmits an infrared signal for synchronization to the indicator 70, and the indicator 70 synchronizes with the infrared signal transmitted by the position detection unit 50 to set the infrared signal set in advance. Send.

The shooting control unit 53 of the position detection unit 50 performs control to match the shooting timing of the imaging unit 51 with the timing when the indicator 70 is turned on. This shooting timing is determined based on the timing when the indicator detection unit 54 turns on the transmission unit 52. The indicator detection unit 54 can specify a pattern in which the indicator 70 is turned on depending on whether or not the image of the light of the indicator 70 is captured in the captured image data of the imaging unit 51.
The pattern in which the indicator 70 is lit may include a pattern unique to each individual indicator 70, or a pattern common to a plurality of indicators 70 and a pattern unique to each individual. In this case, the indicator detection unit 54 can distinguish each image as an image of a different indicator 70 when the captured image data includes images of infrared light emitted from the plurality of indicators 70.

In addition, the control unit 30 controls the emission device driving unit 48 to synchronize the lighting timing of the light source unit 61 with the imaging timing of the imaging unit 51. When the light source unit 61 turns on the pulse in synchronization with the imaging timing of the imaging unit 51, the reflected light of the indicator 80 appears in the captured image of the imaging unit 51 when the indicator 80 points on the screen SC. When the light source unit 61 is turned on in a pattern that can be distinguished from the lighting timing of the indicator 70, the indicator detection unit 54 determines whether the image shown in the captured image data is the indicator 70 or the indicator 80. it can.
For example, consider a case in which the indicator 70 is turned on in synchronization with all the shooting timings of the imaging unit 51 and the light source unit 61 is turned on in a pattern of “1010101010” (1 indicates lighting and 0 indicates light extinction). In this case, it can be determined that the image taken when the light source unit 61 is not lit is due to the indicator 70.

  Further, the control unit 73 included in the indicator 70 switches the pattern for lighting the transmission / reception unit 74 according to the operation state of the operation switch 75. For this reason, the indicator detection unit 54 can determine the operating state of the indicator 70, that is, whether or not the distal end portion 71 is pressed against the screen SC, based on a plurality of captured image data.

The attitude sensor 47 is configured by an acceleration sensor, a gyro sensor, or the like, and outputs a detection value to the control unit 30. The attitude sensor 47 is fixed to the main body of the projector 10 so that the installation direction of the projector 10 can be identified.
As shown in FIG. 1, the projector 10 is installed in a suspended state in which it is suspended from a wall surface or a ceiling surface, in an installation state in which projection is performed from below the screen SC, or in a horizontal plane such as the top surface of a desk. Can be used in situations. Depending on the installation state of the projector 10, the light emitting device 60 may not be suitable for use. For example, when the projection is performed on the screen SC from below, the user's body may block the emitted light of the light emitting device 60, which is inappropriate. The attitude sensor 47 is provided in the main body of the projector 10 so that a plurality of installation states assumed as the installation state of the projector 10 can be identified. The attitude sensor 47 is configured using, for example, a biaxial gyro sensor, a monoaxial gyro sensor, an acceleration sensor, or the like. The control unit 30 can automatically determine the installation state of the projector 10 based on the output value of the attitude sensor 47. When the control unit 30 determines that the installation state is inappropriate for the use of the light emitting device 60, for example, the emission device driving unit 48 stops outputting the power supply voltage and the pulse signal.

The control unit 30 reads out and executes the control program 111 stored in the storage unit 110, thereby realizing the functions of the projection control unit 31, the emission control unit 33, and the setting control unit 36, and controls each unit of the projector 10. To do.
The projection control unit 31 acquires the content of the operation performed by the operator based on the operation data input from the operation detection unit 17. The projection control unit 31 controls the image processing unit 40, the light source driving unit 45, and the light modulation device driving unit 46 according to the operation performed by the operator, and projects an image on the screen SC. The projection control unit 31 controls the image processing unit 40 to determine the above-described 3D (stereoscopic) image and 2D (planar) image, resolution conversion processing, frame rate conversion processing, distortion correction processing, digital zoom processing, and tone correction. Processing, brightness correction processing, and the like are executed. Further, the projection control unit 31 controls the light source driving unit 45 in accordance with the processing of the image processing unit 40 and controls the light amount of the light source unit 21.

The detection control unit 32 controls the position detection unit 50 to detect the operation positions of the indicators 70 and 80 and acquires the coordinates of the operation positions. Further, the detection control unit 32 obtains data for identifying whether it is the operation position of the indicator 70 or the operation position of the indicator 80 and data indicating the operation state of the operation switch 75 together with the coordinates of the operation position. To do. The detection control unit 32 executes a preset process based on the acquired coordinates and data. For example, the image processing unit 40 performs a process of drawing a figure based on the acquired coordinates and superimposing the drawn figure on an input image input to the image I / F unit 12 and projecting it. The detection control unit 32 may output the acquired coordinates to an external device such as a PC connected to the I / F unit 11. In this case, the detection control unit 32 may convert the acquired coordinates into a data format recognized as an input of the coordinate input device in the operating system of the external device connected to the I / F unit 11 and output the converted data. Good. For example, when a PC operating on a Windows (registered trademark) operating system is connected to the I / F unit 11, data processed as input data of HID (Human Interface Device) in the operating system is output. In addition to the coordinate data, the detection control unit 32 outputs data for identifying whether the position is the operation position of the indicator 70 or the operation position of the indicator 80 and data indicating the operation state of the operation switch 75. May be.
Further, the detection control unit 32 may execute calibration for detecting the pointing positions of the pointers 70 and 80. The calibration is, for example, a process of associating the designated position in the captured image data of the imaging unit 51 with the position in the image drawn in the frame memory 44.

  Further, the detection control unit 32 controls position detection using the indicator 80. Specifically, the detection control unit 32 determines whether or not the light emitting device 60 can be used based on whether or not the light emitting device 60 is connected. When the light emitting device 60 cannot be used, the detection control unit 32 performs setting so that the light emitting device 60 cannot be used. Here, the detection control unit 32 may notify that the light emitting device 60 cannot be used.

  The emission control unit 33 controls the emission device driving unit 48 to execute or stop the output of the power source and the pulse signal to the light emission device 60 connected to the connection unit 49. When the light emission device 60 cannot be used or is not used by the control of the detection control unit 32 or the setting performed by the function of the setting control unit 36, the emission control unit 33 supplies the power and pulse of the emission device driving unit 48. Stop signal output. When the light emitting device 60 is used, the emission control unit 33 outputs the power supply and pulse signal of the emission device driving unit 48.

FIG. 3 is a main part configuration diagram of the projector 10 and the light emitting device 60.
The light emitting device 60 includes a connection portion 63 to which a cable 60a is connected, and the connection portion 63 and the connection portion 49 are connected to each other by a cable 60a. The connection parts 49 and 63 are connectors having a plurality of terminals (pins). In the example of FIG. 3, a ground terminal GND, a power supply terminal Vcc through which a power supply current flows, and a signal terminal SIG that inputs and outputs a pulse signal are connected. And a detection terminal DET for detection.

A solid light source 62 included in the light source unit 61 is connected to the connection unit 63. In the example of FIG. 3, the light source unit 61 includes two solid light sources 62 and 62. The solid light source 62 is configured by, for example, an infrared LED or an infrared laser diode. A power supply current flowing through the power supply terminal Vcc of the connection unit 63 and a pulse signal input to the signal terminal SIG are output to the solid light sources 62 and 62. For example, the solid light sources 62 and 62 may be directly connected to the terminals of the connection portion 63.
For this reason, when a power supply current flows through the power supply terminal Vcc of the connection portion 63 and a pulse signal is input to the signal terminal SIG, the solid light sources 62 and 62 are turned on and off according to the pulse signal.

The emission device driving unit 48 generates a pulse signal P for lighting the solid light sources 62 and 62 under the control of the emission control unit 33 (FIG. 2) provided in the control unit 30, and outputs the pulse signal P to the connection unit 49. With the pulse signal P, the solid light sources 62 and 62 are turned on and off, and the luminance of the solid light sources 62 and 62 is PWM-controlled. The pulse signal P output from the signal output terminal SIG to the connection unit 49 by the emission device driving unit 48 is output from the signal terminal SIG of the connection unit 49 to the connection unit 63.
Further, the emission device driving unit 48 supplies a power supply current E supplied from a power supply circuit (not shown) from the power supply terminal Vcc to the connection unit 49. The power supply current E flows from the power supply terminal Vcc of the connection portion 49 to the connection portion 63.

A control signal S <b> 1 is input from the control unit 30 to the emission device driving unit 48. The control signal S1 is a signal that controls the timing, on-time, off-time, duty, and the like of the pulse signal generated by the emission device driving unit 48. The enable signal S2 is input from the control unit 30 to the enable terminal EN of the emission device driving unit 48.
The emission device driving unit 48 outputs the pulse signal P and the power source current E while the operation is instructed by the enable signal S2 (for example, the state where the enable signal S2 is “High”). On the other hand, while the operation is not instructed by the enable signal S2, the output of the pulse signal P and the power supply current E is stopped while the enable signal S2 is in the “Low” state, for example. For example, it is possible to use a circuit in which the generation circuit of the pulse signal P included in the emission device driving unit 48 is disconnected (cut off) from the signal output terminal SIG of the emission device driving unit 48 according to the voltage value of the enable signal S2. Further, it is possible to use a circuit in which the generation circuit of the power supply current E provided in the emission device driving unit 48 and the power supply terminal Vcc are separated according to the voltage value of the enable signal S2.
As described above, the output of the pulse signal P and the power supply current E from the emission device driving unit 48 to the connection unit 49 is stopped by the state of the enable signal S2 output from the control unit 30. Further, at least the output of the power source current E from the emission device driving unit 48 to the connection unit 49 is stopped. Therefore, the control unit 30 can switch on / off the output of the pulse signal and the power supply current to the light emitting device 60.

The output of the detection terminal DET of the connection unit 49 is input to the control unit 30 as the detection signal S5. For example, the detection signal S5 is input to a detection terminal DET of an MCU (Micro Controller Unit) that constitutes all or part of the control unit 30. The detection signal S5 is a signal indicating whether or not the connection unit 63 is connected to the connection unit 49. The detection signal S5 is, for example, a signal that takes different voltage values in a state in which the connection unit 63 is connected to the connection unit 49 (connection state) and a state in which the connection unit 63 is not connected (non-connection state).
As an example, a circuit in which the detection terminal DET is connected to the power supply terminal Vcc via a pull-up resistor inside the connection unit 63 can be used. In this case, the voltage of the detection terminal DET of the connection unit 49 is connected to the power supply terminal Vcc via the pull-up resistor in the connected state. Here, if the circuit configuration is such that the detection terminal DET of the connection unit 49 is grounded in a non-connected state, the voltage of the detection terminal DET of the connection unit 49 is different between the connected state and the non-connected state. If the voltage of the detection terminal DET is input to the control unit 30 as the detection signal S5, the control unit 30 can determine connection or non-connection. Not limited to this example, a circuit is used in which the voltage at the detection terminal DET of the connection portion 49 is different between the connected state and the non-connected state, and the voltage of the detection signal S5 is changed according to the change in the voltage of the detection terminal DET. Any configuration that changes is acceptable.

  The emission control unit 33 determines the connection state and the non-connection state based on the detection signal S5, and in the non-connection state, sets the value of the enable signal S2 to an off-side value and stops the output from the emission device driving unit 48. . When the cable 60a is not connected to the connection portion 49, the connector pin of the connection portion 49 is exposed. At this time, for example, if a voltage is applied to the power supply terminal Vcc, a short circuit may occur when a foreign object comes into contact with the pin. Further, when the connection portion 63 is connected to the connection portion 49 in a state where a voltage is applied to the power supply terminal Vcc, an inrush current flows, so that at least one of the emission device driving portion 48 and the light emission device 60 is applied. There are concerns about adverse effects. If the output device driving unit 48 stops the output, there is no fear of short circuit or inrush current. Therefore, it is not necessary to take measures to cover the connector of the connecting portion 49 with a cover or to turn off the power of the projector 10 to prevent an inrush current when the light emitting device 60 is connected. For this reason, the projector 10 which can attach or detach the light-emitting device 60 without impairing the convenience can be realized.

  In the connected state, the emission control unit 33 outputs the pulse signal P and the power source current E from the emission device driving unit 48 with the enable signal S2 set to an on-side value. While the light emitting device 60 is connected, a pulse signal for turning on the solid light sources 62 and 62 and a power supply current can be supplied to the light emitting device 60. For this reason, since it is not necessary to provide a separate power source for the light emitting device 60, an operation for turning on / off the power of the light emitting device 60 is also unnecessary. Further, the light emitting device 60 can be reduced in size and weight.

  Note that the emission device driving unit 48 and the light emission device 60 are not limited to the configuration in which the luminance of the solid light sources 62 and 62 is PWM-controlled. For example, a laser diode may be used as the solid light source 62 and continuous oscillation may be performed, or when an LED is used as the solid light source 62, continuous lighting may be performed. The configuration for inputting the enable signal S2 to the emission device driving unit 48 can be variously changed and will be described later as a modification.

The setting control unit 36 (setting unit) provides a user with a setting function related to the function of the main body of the projector 10. That is, the setting control unit 36 reads the setting screen data 112 from the storage unit 110 and causes the projection control unit 31 to display the setting screen when the setting start is instructed by operating the remote control light receiving unit 18 or the operation panel 19. . The setting control unit 36 detects an operation performed by the remote control light receiving unit 18 or the operation panel 19 while the setting screen is displayed, and performs setting related to the function of the projector 10 according to this operation, and updates the setting data 113 indicating the setting content. To do.
The setting control unit 36 is not limited to the remote control light receiving unit 18 and the operation panel 19, and may provide a function for performing settings by operating the indicators 70 and 80. In this case, the setting control unit 36 obtains the coordinates of the indicated position from the position detection unit 50 when an instruction operation is performed by the indicators 70 and 80 on the setting screen projected on the screen SC by the projection control unit 31. Obtain and determine the contents of the instruction operation and set.
Under the control of the setting control unit 36, the projector 10 can set whether or not to detect the positions of the indicators 70 and 80. Furthermore, it is good also as a structure which can each set whether the position detection of the indicator 70 is performed, and whether the position detection of the indicator 80 is performed.
In the present embodiment, one of an operation mode in which the positions of the indicators 70 and 80 are not detected, an operation mode in which the positions of the indicators 70 are detected, and an operation mode in which the positions of the indicators 70 and 80 are detected is selected. The configuration that can be set will be described. In this case, the setting content selected by the control of the setting control unit 36 is written into the setting data 113 and stored in the storage unit 110.

  Here, the state in which the light source unit 61 is turned on by supplying power and a pulse signal from the emission device driving unit 48 to the light emission device 60 is referred to as an emission state of the light emission device 60. A state in which at least one of the pulse signal and the power supply current is not output from the projector 10 to the light emitting device 60 is defined as a non-emission state.

FIG. 4 is a flowchart showing the operation of the projector 10.
When the power of the projector 10 is turned on, the control unit 30 executes initialization of each unit of the projector 10 and the control unit 30 (step ST11). In step ST11, for example, detection of device connection status in the I / F unit 11 and image I / F unit 12, detection of input image data, and devices connected to the I / F unit 11 and image I / F unit 12 The communication may be initialized. In step ST11, since an image is projected, the image to be projected may be selected.

After the initialization is completed, image projection is started under the control of the projection control unit 31 (step ST12).
Subsequently, the detection control unit 32 refers to the setting data 113 (step ST13) and determines whether or not to perform position detection using the indicators 70 and 80 (step ST14). Here, when the setting of the setting data 113 is an operation mode in which the positions of the indicators 70 and 80 are not detected, the detection control unit 32 determines that position detection is not performed (step S14; No), The process proceeds to step ST24 described later.
When either the operation mode for detecting the position of the indicator 70 or the operation mode for detecting the position of the indicators 70 and 80 is set (step ST14; Yes), the detection control unit 32 It is determined whether or not to detect the position of the body 80 (step ST15).

  When the light emitting device 60 is operated, that is, when the position of the indicator 80 is detected (step S15; Yes), the emission control unit 33 determines whether or not the light emitting device 60 is connected with the detection signal S5 (FIG. The determination is made based on 3) (step ST16). If it is determined that the light emitting device 60 is connected (step ST16; Yes), the emission control unit 33 switches the enable signal S2 to the on state (step ST17). Thereby, the emission device driving unit 48 starts outputting the power source current E and the pulse signal P, and the solid light sources 62 and 62 (FIG. 3) are turned on in the light emission device 60 (step ST18). Thereafter, the position detector 50 detects the reflected light reflected by the indicator 80 from the detection light emitted from the light emitting device 60, thereby detecting the position of the indicator 80 (step ST19).

  Thereafter, the emission control unit 33 determines whether or not the light emitting device 60 is connected based on the detection signal S5 (step ST20). If it is determined that the light emitting device 60 is not connected (step ST20; No), the emission control unit 33 switches the enable signal S2 to the off state (step ST21). Thereby, the emission device driving unit 48 stops the output of the power source current E and the pulse signal P (step ST22). Further, the emission control unit 33 notifies the projection control unit 31 that the light emitting device 60 is not connected by being superimposed on the image being projected on the screen SC (step ST23). In step ST23, the emission control unit 33 outputs a notification image to the projection control unit 31, and the projection control unit 31 causes the image processing unit 40 to superimpose the image output by the emission control unit 33 on the input image. Thereby, the projection unit 20 projects the notification onto the screen SC, and the user who uses the projector 10 is notified that the light emitting device 60 is not connected or the light emitting device 60 is disconnected.

  The determination in step ST20 is a process of detecting that the light emitting device 60 is disconnected while the power source current E and the pulse signal P are being output from the emitting device driving unit 48 to the light emitting device 60. For this reason, the determination in step ST20 may be performed not by flow control but by interrupt control. In other words, the emission control unit 33 may perform the determination corresponding to step ST20 by constantly monitoring the voltage value of the detection signal S5 during the operation of the projector 10. In this case, when the voltage value of the detection signal S5 changes, the emission control unit 33 performs the processes of steps ST21 to ST23 by interrupt control.

When the emission control unit 33 determines the connection of the light emitting device 60 (step ST20; Yes), the control unit 30 proceeds to step ST24. Even after notifying that the light emitting device 60 is disconnected in step ST23, the process proceeds to step ST24. Also, in step ST14, if the contents for which position detection is not performed is set in the setting data 113, the process proceeds to step ST24.
In step ST24, the setting control unit 36 determines whether or not the function setting of the projector 10 is instructed by the operation of the remote control light receiving unit 18 or the operation panel 19. When setting is instructed, the setting control unit 36 executes setting processing (step ST25). In this setting process, the setting control unit 36 projects the setting screen data 112 on the screen SC, receives the setting by the remote control light receiving unit 18 or the operation panel 19, and updates the setting data 113 based on the received setting content. After completion of the setting process and when setting is not instructed, the control unit 30 determines whether or not the end of projection has been instructed by operating the remote control light receiving unit 18 or the operation panel 19 (step ST26). When the end of projection is instructed, the control unit 30 executes a series of processes for finishing the projection and ends the present process. If the end of projection is not instructed, the control unit 30 returns to step ST13.

If it is determined in step ST16 that the light emitting device 60 is not connected (step S16; No), the emission control unit 33 turns off the enable signal S2 (step ST27). The emission device driving unit 48 stops outputting the power source current E and the pulse signal P, or maintains the output stopped state. The emission control unit 33 notifies the projection control unit 31 that the light emitting device 60 is not connected by being superimposed on the image being projected on the screen SC (step ST28). Thereafter, the detection control unit 32 starts position detection of the indicator 70 by the position detection unit 50 (step S29).
If it is determined in step S15 that the position of the indicator 80 is not detected (step ST15; No), the emission control unit 33 turns the enable signal S2 into an off state (step ST31). The emission device driving unit 48 stops outputting the power source current E and the pulse signal P, or maintains the output stopped state. The detection control unit 32 starts position detection of the indicator 70 by the position detection unit 50 (step S32), and proceeds to step S24.

  The processes of steps ST24 and S26 are not limited to the case where they are executed by flow control, and may be executed by interrupt control as in step ST20. That is, when the start of setting is instructed by operating the remote control light receiving unit 18 or the operation panel 19, step ST25 may be started as interrupt control, and the same applies to step ST26. Therefore, the processing of each step shown in FIG. 4 does not necessarily have to be executed in the sequence shown in FIG.

  As described above, the projection system 1 according to the embodiment to which the present invention is applied includes the projection unit 20, the connection unit 49 to which the light emitting device 60 is connected by wire, the position detection unit 50, the emission device driving unit 48, and the emission unit. A control unit 33 is provided. The light emitting device 60 is a device that emits detection light for position detection along the screen SC, and the position detection unit 50 detects an operation on the screen SC using the detection light emitted by the light emitting device 60. The emission device driving unit 48 supplies power to the light emission device 60 through the connection unit 49. When the light emitting device 60 is not connected to the connection unit 49, the emission control unit 33 stops the power supply from the emission device driving unit 48 to the connection unit 49, that is, the output of the power supply current E. As a result, no voltage is applied to the emission device drive unit 48 when the light emission device 60 is not connected. Therefore, it is possible to prevent the occurrence of an inrush current when the light emitting device 60 is connected to the projector 10 and the influence of sudden light emission when the light emitting device 60 is connected. For this reason, the structure which supplies electric power to the light-projection apparatus 60 from the projector 10 can be employ | adopted, and when connecting or removing the light-projection apparatus 60, the projector 10 does not need to be stopped. Accordingly, the projector 10 can be provided with a function of detecting the designated position using light without impairing convenience.

Further, when it is determined that the light emitting device 60 has changed from the state connected to the connection unit 49 to the non-connection state, the emission control unit 33 stops the power supply from the emission device driving unit 48 to the connection unit 49. . For this reason, when the light emitting device 60 once connected is removed while the power supply current E is being supplied, a sudden change in the power supply state by the power supply device of the projector 10 can be prevented. Further, it is possible to prevent a load due to an inrush current or the like when the light emitting device 60 is connected again. Further, when it is not detected that the light emitting device 60 is connected to the connection unit 49, the emission control unit 33 stops the power supply from the emission device driving unit 48 to the connection unit 49 or maintains the stopped state. .
The connecting portion 49 is connected to the light emitting device 60 by a cable 60a having at least a power supply line, a control signal transmission line, and a connection detection line. Further, the connecting portion 49 includes terminals of the power supply terminal Vcc, the signal terminal SIG, and the detection terminal DET connected to the above-described lines. The emission control unit 33 stops the power supply from the emission device driving unit 48 to the power supply terminal Vcc of the connection unit 49 when the light emission device 60 is not connected to the connection unit 49.

  Further, the position detection unit 50 has a reflected light detection function for detecting reflected light reflected from the indicator 80 (first indicator) by the detection light emitted from the light emitting device 60. Moreover, the setting control part 36 which sets use and non-use of the reflected light detection function of the position detection part 50 is provided. When the setting control unit 36 sets the non-use of the reflected light detection function, the emission control unit 33 stops the power supply from the emission device driving unit 48 to the connection unit 49. For this reason, when the projector 10 is set not to use the function of the light emitting device 60, the power supply can be stopped and the power consumption can be suppressed.

Note that the configurations of the control unit 30, the emission device driving unit 48, and the connection unit 49 described in the above embodiment are merely examples, and are not limited to the configurations shown in the embodiment. Hereinafter, modified examples will be described.
[First Modification]
FIG. 5 is a main part configuration diagram of the projector 10 and the light emitting device 60 according to the first modification. In the configuration of the first modification, the detection signal S5 output from the connection unit 49 is input to the enable terminal EN of the emission device driving unit 48. That is, the detection signal S5 is input to the enable terminal EN instead of the enable signal S2 (FIG. 3). The emission device driving unit 48 generates the pulse signal P according to the control signal S <b> 1 input from the control unit 30.
The extraction device driver 48 outputs a pulse signal while the detection signal S5 input to the enable terminal EN is in a state of operating the extraction device driver 48 (for example, the detection signal S5 is “High”). P and the power supply current E are output to the connection portion 49. On the other hand, while the detection signal S5 is not in a state of operating the emission device driving unit 48 (for example, while the detection signal S5 is in a “Low” state), the output of the pulse signal P and the power supply current E is stopped.
In this modified example, the voltage of the detection signal S5 when the light emitting device 60 is connected to the connecting portion 49 and when the light emitting device 60 is not connected becomes a voltage that instructs the operation and stop of the emitting device driving section 48. A pull-up resistor and an inverting circuit may be arranged as necessary.

  According to the first modified example, the pulse signal P from the emission device driving unit 48 to the connection unit 49 and the connection state of the light emission device 60 with respect to the connection unit 49 without the control unit 30 being interposed. The output / cutoff of the power supply current E can be switched. Therefore, by not interposing the determination by the control unit 30, for example, when the light emitting device 60 is removed from the connection unit 49, the pulse signal P and the power supply current E can be cut off more quickly. Further, when the light emitting device 60 is connected to the connection portion 49, it is possible to quickly supply a pulse signal and a power supply current. Furthermore, since the control unit 30 only has to output the control signal S1 to the emission device driving unit 48 at all times, it is possible to reduce the load on the control unit 30, simplify the configuration, and the like.

[Second Modification]
FIG. 6 is a main part configuration diagram of the projector 10 and the light emitting device 64 according to the second modification. In the second modification, the light emitting device 64 is connected to the connecting portion 49 instead of the light emitting device 60 of the above embodiment. The light emitting device 64 includes the light source unit 61 and is turned on by the pulse signal and power supply current output from the connection unit 49, and is similar to the light emitting device 60 in that infrared light is emitted corresponding to the screen SC. . The light emitting device 64 includes a connecting portion 65 instead of the connecting portion 63 of the light emitting device 60 (FIG. 3). Further, a failure detection circuit 66 is interposed between the connection unit 65 and the light source unit 61.

The connection unit 65 includes a power supply terminal Vcc, a signal terminal SIG, a ground terminal GND, and a detection terminal DET connected to the cable 60a. The power supply current flowing through the power supply terminal Vcc of the connection portion 65 and the pulse signal input to the signal terminal SIG are supplied to the solid state light sources 62 and 62 through the failure detection circuit 66. Further, the detection terminal DET of the connection unit 65 is connected to the failure detection circuit 66.
In this configuration, as in the embodiment shown in FIG. 3, the voltage at the detection terminal DET of the connection portion 49 changes depending on whether the connection portion 65 is connected to the connection portion 49 or not. It has become. The configuration of the control unit 30 is the same as that in the above embodiment. That is, the voltage value of the detection signal S5 input to the control unit 30 changes due to a change in the voltage of the detection terminal DET of the connection unit 49, and the control unit 30 determines whether the light emitting device 64 is connected or not. .

The failure detection circuit 66 has a function of detecting a failure of the solid light sources 62 and 62. The failure detection circuit 66 detects the presence / absence of an abnormality in the solid light sources 62 and 62 by detecting currents flowing through the solid light sources 62 and 62, for example. When the solid light source 62 is configured by a laser diode or LED, a failure can be determined based on the current flowing through the solid light source 62.
The failure detection circuit 66 changes the voltage of the detection terminal DET of the connection portion 65 to a voltage when the connection portion 65 is not connected to the connection portion 49 when an abnormality occurs in any one of the solid light sources 62.

  One specific example will be described. The failure detection circuit 66 includes four terminals corresponding to the power supply terminal Vcc, the signal terminal SIG, the ground terminal GND, and the detection terminal DET included in the connection unit 65. For this reason, the terminal of the connection part 49 is connected to the failure detection circuit 66 through the connection part 65. The failure detection circuit 66 has a circuit that passes through the power supply current supplied to the power supply terminal Vcc and the pulse signal input to the signal terminal SIG and supplies it to the solid state light sources 62 and 62. Further, the failure detection circuit 66 has a circuit for connecting the detection terminal DET of the connection portion 65 to the power supply terminal Vcc via a pull-up resistor. For this reason, when the connection part 65 is connected to the connection part 49, the voltage of the detection terminal DET of the connection part 49 changes. A switch element (not shown) is provided in a circuit that connects the detection terminal DET to the power supply terminal Vcc in the failure detection circuit 66. The failure detection circuit 66 turns off the switch element when the failure of the solid state light sources 62, 62 is detected. In this case, since the voltage of the detection terminal DET of the connection unit 49 becomes the same voltage as when the connection unit 65 is not connected, the output of the pulse signal P and the power supply current E from the emission device driving unit 48 to the connection unit 49 stops. .

  Thus, according to the second modified example, when the failure detection circuit 66 detects a failure, the light emitting device 64 is disconnected from the control unit 30, the emission device driving unit 48, and the connection unit 49. Similarly to the case, the output of the pulse signal P and the power source current E of the emission device driving unit 48 is stopped. Therefore, when a failure occurs in the light emitting device 64, the supply of the pulse signal and the power supply current to the light emitting device 64 can be stopped quickly.

[Third Modification]
FIG. 7 is a main part configuration diagram of the projector 10 and the light emitting device 67 according to the third modification. In the third modification, the light emitting device 67 is connected to the connecting portion 49 instead of the light emitting device 60 of the above embodiment. The light emitting device 67 includes the light source unit 61, is lit by a pulse signal output from the connection unit 49 and a power supply current, and is similar to the light emitting device 60 in that infrared light is emitted corresponding to the screen SC. . The light emitting device 67 includes a connecting portion 69 instead of the connecting portion 63 of the light emitting device 60 (FIG. 3). An indicator 68 is connected to the connecting portion 69. The indicator 68 includes a light emitter such as an LED that emits visible light, and notifies the operating state of the light emitting device 67 by the light emission of the light emitter.

The light emitter of the indicator 68 is installed in a direction that can be viewed by a user operating the indicators 70 and 80. For example, in the installation state of FIG. 1, the light emitting device 67 is arranged on the screen SC side (lower side) or the front side.
Similar to the connection part 63, the connection part 69 includes a power supply terminal Vcc, a signal terminal SIG, a ground terminal GND, and a detection terminal DET connected to the cable 60a. The power supply current flowing through the power supply terminal Vcc of the connection unit 69 and the pulse signal input to the signal terminal SIG are supplied to the solid light sources 62 and 62. Further, the detection terminal DET of the connection portion 69 is configured in the same manner as the connection portion 63, and the detection terminal DET of the connection portion 49 is in a state where the connection portion 69 is connected to the connection portion 49 and a state where it is not connected. The voltage changes. Moreover, the structure of the control part 30 is the same as the said embodiment. That is, the voltage value of the detection signal S5 input to the control unit 30 changes due to a change in the voltage of the detection terminal DET of the connection unit 49, and the control unit 30 determines whether the light emitting device 64 is connected or not. .

The connection unit 69 can be configured to supply a power supply current supplied to the power supply terminal Vcc to the indicator 68, and the indicator 68 emits light while the power supply current is supplied. In this case, the indicator 68 emits light while the power supply current is supplied to the light emitting device 67. Therefore, the user can know that the light emitting device 67 is normally connected to the projector 10 and is operable.
Moreover, the connection part 69 can also output the pulse signal input into signal terminal SIG with the power supply current to the indicator 68, and the indicator 68 can also be set as the structure light-emitted according to a pulse signal. In this case, the indicator 68 emits light in synchronization with the timing at which the solid light sources 62 and 62 emit light. Therefore, the user can know that the light emitting device 67 is normally connected to the projector 10 and is operable, and the detailed operating state of the light emitting device 67.

  Note that the above-described embodiments and modifications are merely examples of specific modes to which the present invention is applied, and the present invention is not limited thereto, and the present invention can be applied as different modes. In the above embodiment, the emission control unit 33 has been described by taking as an example a configuration in which the connection between the connection unit 49 and the light emitting device 60 is electrically determined or detected based on the detection signal S5. It is not limited to this. For example, a switch that mechanically detects that the cable 60a is connected to the connection portion 49 may be provided, and the connection / disconnection of the light emitting device 60 may be determined or detected based on the state of the switch. In the above-described embodiment and modification, the light emitting device 60 is installed above the screen SC and the detection light is emitted downward along the surface of the screen SC. However, the present invention is limited to this. Not. For example, the light emitting device 60 may be installed on the left and right sides of the screen SC, the upper right corner or the upper left corner, or the detection light may be emitted from a position away from the screen SC. Further, a plurality of light emitting devices 60 may be provided on one screen SC, and detection light may be emitted from the plurality of light emitting devices 60. In this case, the plurality of light emitting devices 60 synchronize with each other to detect light. It is good to emit. Moreover, in the said embodiment and modification, although the light-projection apparatus 60 was comprised separately from the main body of the projector 10, and illustrated the structure connected with the cable 60a, this invention is not limited to this. For example, the light emitting device 60 may be integrally attached to the main body of the projector 10 or may be configured to be built in the main body of the projector 10. Further, the light emitting device 60 may be supplied with power from the outside and connected to the emitting device driving unit 48 by a wireless communication line. In the above embodiment, the configuration in which the projector 10 transmits the synchronization signal to the indicator 70 using the infrared signal emitted from the transmission unit 52 to the indicator 70 has been described. However, the synchronization signal is an infrared signal. It is not limited to. For example, a synchronization signal may be transmitted by radio wave communication or ultrasonic wireless communication. This configuration can be realized by providing the projector 10 with a transmission unit that transmits signals by radio wave communication or ultrasonic radio communication, and providing the indicator 70 with a similar reception unit.

  Moreover, in the said embodiment, although the position detection part 50 image | photographed the screen SC by the imaging part 51 and pinpointed the position of the indicator 70, this invention is not limited to this. For example, the imaging unit 51 is not limited to the one provided in the main body of the projector 10 and photographing the projection direction of the projection optical system 23. The imaging unit 51 may be arranged separately from the main body of the projector 10, or the imaging unit 51 may perform imaging from the side or front of the screen SC. Further, a plurality of imaging units 51 may be arranged, and the detection control unit 32 may detect the positions of the indicators 70 and 80 based on the captured image data of the plurality of imaging units 51. In addition, a method may be employed in which the indicator 80 is detected based on a captured image of the imaging unit 51 while the position of the indicator 70 is detected by electromagnetic waves such as ultrasonic waves. In the above embodiment, the pen-type indicator 70 is illustrated, but the indicator 70 may be a laser pointer, an indicator bar, or the like, and its shape and size are not limited.

  In the above embodiment, the light modulation device 22 that modulates the light emitted from the light source has been described by taking as an example a configuration using three transmissive liquid crystal panels corresponding to RGB colors. Is not limited to this. For example, a configuration using three reflective liquid crystal panels may be used, or a method in which one liquid crystal panel and a color wheel are combined may be used. Alternatively, a system using three digital mirror devices (DMD), a DMD system combining one digital mirror device and a color wheel, or the like may be used. When only one liquid crystal panel or DMD is used as the light modulation device, a member corresponding to a synthetic optical system such as a cross dichroic prism is unnecessary. In addition to the liquid crystal panel and DMD, any light modulation device capable of modulating light emitted from the light source can be employed without any problem.

In the above-described embodiment, a mode has been described in which the user performs an instruction operation using the indicators 70 and 80 on the screen SC on which the front projection type projector 10 projects (displays) an image. The display device (display unit) other than 10 may perform an instruction operation on a display screen (display surface) on which an image is displayed. Also in this case, the light emitting devices 60, 64, 67 and the imaging unit 51 may be configured integrally with the display device, or may be configured separately from the display device. Display devices other than the projector 10 include a rear projection type projector, a liquid crystal display, an organic EL (Electro Luminescence) display, a plasma display, a CRT (cathode ray tube) display, and a SED (Surface-conduction Electron-emitter Display). Etc. can be used.
Moreover, each function part of the projection system 1 shown in FIG. 2 shows a functional structure, and a specific mounting form is not particularly limited. That is, it is not always necessary to mount hardware corresponding to each function unit individually, and it is of course possible to adopt a configuration in which the functions of a plurality of function units are realized by one processor executing a program. In addition, in the above embodiment, a part of the function realized by software may be realized by hardware, or a part of the function realized by hardware may be realized by software. In addition, specific detailed configurations of other parts of the projection system 1 can be arbitrarily changed without departing from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Projection system, 10 ... Projector (display apparatus), 20 ... Projection part (display part), 21 ... Light source part, 22 ... Light modulation apparatus, 23 ... Projection optical system, 30 ... Control part, 31 ... Projection control part, 32 ... Detection control unit, 33 ... Ejection control unit, 36 ... Setting control unit (setting unit), 40 ... Image processing unit, 48 ... Ejection device drive unit (drive unit), 49 ... Connection unit, 50 ... Position detection unit ( Detection unit), 60, 64, 67 ... light emitting device (light emitting unit), 61 ... light source unit, 62 ... solid light source, 63, 65, 69 ... connection unit, 70 ... indicator (second indicator), 80: Indicator (first indicator), 110: Storage unit, SC: Screen (projection surface, display surface).

Claims (8)

A projection unit for displaying an image on the projection surface;
A light emitting portion for emitting detection light for position detection along the projection surface;
A detection unit that detects an operation on the projection surface using the detection light;
A drive unit for supplying power to the light emitting unit via the connection unit;
When the light emitting unit is not connected to the connection unit, an emission control unit that stops power supply from the drive unit to the connection unit;
A projector comprising:   The emission control unit stops power supply from the drive unit to the connection unit when it is determined that the light emission unit has changed from a state connected to the connection unit to a non-connection state. The projector according to claim 1.   The said emission control part stops the electric power supply from the said drive part to the said connection part, when it is not detected that the said light emission part was connected to the said connection part, The Claim 1 or 2 characterized by the above-mentioned. The projector described. The connecting portion is connected to the light emitting portion by a cable having at least a power supply line, a control signal line, and a connection detection line, and the power supply line, the control signal line, and the connection detection line are connected. With terminals connected to each
The emission control unit, when the light emission unit is not connected to the connection unit, to stop the power supply to the terminal connected to the power supply line;
The projector according to claim 1, wherein: The detection unit has a reflected light detection function for detecting reflected light reflected by the first indicator from the detection light emitted by the light emitting unit;
A setting unit for setting use and non-use of the reflected light detection function of the detection unit;
The emission control unit is configured to stop power supply from the drive unit to the connection unit when the setting unit is set to not use the reflected light detection function;
The projector according to claim 1, wherein: A display unit for displaying an image on the display surface;
A light emitting portion that emits detection light for position detection along the display surface;
A detection unit that detects an operation on the display surface using the detection light;
A drive unit for supplying power to the light emitting unit via the connection unit;
When the light emitting unit is not connected to the connection unit, an emission control unit that stops power supply from the drive unit to the connection unit;
A display device comprising: A projector that displays an image on a projection surface, and a light emitting device that is connected to the projector and emits detection light along the projection surface,
The projector is
A projection unit for displaying the image;
A connection part to which the light emitting device is connected by wire;
A detection unit that detects an operation on the projection surface using the detection light;
A drive unit for supplying power to the light emitting device via the connection unit,
When the light emitting device is not connected to the connection unit, stopping power supply from the drive unit to the connection unit;
Projection system characterized by A method of controlling a projector that displays an image on a projection surface,
A light emitting unit that emits detection light for position detection along the projection surface is connected to a connection unit of the projector, and supplies power to the light emission unit via the connection unit;
When the light emitting unit is not connected to the connection unit, stopping power supply from the connection unit;
A projector control method characterized by the above.

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