Projector control method and projection system

Abstract

To provide a control method of a projector and a projection system which increase operability when a projector is operated by voice.SOLUTION: A control method of a projector includes such procedures that: an operation related to function of a projector 1 having a light source 11 and a cooling fan 15 is accepted; the function of the projector 1 is switched from a first mode to a second mode according to the operation; the projector 1 is controlled on the basis of result of voice recognition of user's voice which is accepted while the projector 1 is functioned in the second mode; the output of the light source 11 in the second mode is lowered than that in the first mode; and the rotational speed of the cooling fan 15 in the second mode is lowered than that in the first mode.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for controlling a projector and a projection system. [Background technology]

[0002] There are known projectors that can be operated by voice. For example, a projection system disclosed in Patent Document 1 uses a commander with a microphone to perform voice recognition, and controls the projector to send the screen to be displayed or select an arbitrary screen in response to the voice recognition result. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-215707 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration described in Patent Document 1, there is a possibility that the accuracy of the voice recognition process may decrease due to the influence of environmental sounds, resulting in a decrease in operability. [Means for solving the problem]

[0005] One aspect of the present disclosure is a method for controlling a projector, the method including: receiving an operation related to the operation of a projector having a light source and a cooling fan; switching the operation of the projector from a first mode to a second mode in response to the operation; and controlling the projector based on a result of voice recognition of a user's voice received while the projector is operating in the second mode, wherein an output of the light source in the second mode is made lower than an output of the light source in the first mode, and a rotation speed of the cooling fan in the second mode is made lower than the rotation speed of the cooling fan in the first mode.

[0006] Another aspect of the present disclosure is a method for controlling a projector, the method including: receiving an operation related to the operation of a projector having a pixel shifting device that shifts image light to be projected onto a projection surface; switching the operation of the projector from a first mode to a second mode in response to the operation; and controlling the projector based on a result of voice recognition of a user's voice received while the projector is operating in the second mode, wherein the second mode reduces an operating speed or an operating range of the pixel shifting device compared to the first mode.

[0007] Yet another aspect of the present disclosure is a projection system comprising: a projector having a light source and a cooling fan; a voice recognition unit that detects a user's voice using a microphone and performs voice recognition on the user's voice; and a control device having a mode control unit that switches the operation of the projector from a first mode to a second mode in response to an operation related to the operation of the projector, wherein the control device controls the projector based on a result of voice recognition of the user's voice received by the voice recognition unit while the projector is operating in the second mode, to make the output of the light source in the second mode lower than the output of the light source in the first mode, and to make the rotation speed of the cooling fan in the second mode lower than the rotation speed of the cooling fan in the first mode.

[0008] Yet another aspect of the present disclosure is a projection system comprising: a projector having a projection device that projects image light onto a projection surface and a pixel shifting device that shifts the image light; a voice recognition unit that detects a user's voice using a microphone and performs voice recognition on the user's voice; and a control device having a mode control unit that switches the operation of the projector from a first mode to a second mode in response to an operation related to the operation of the projector, wherein the control device controls the projector based on a result of voice recognition of the user's voice received by the voice recognition unit while the projector is operating in the second mode, and the mode control unit reduces the operating speed or operating range of the pixel shifting device in the second mode compared to the first mode. [Brief description of the drawings]

[0009] [Figure 1] 1 is a block diagram showing an example of the configuration of a projection system according to a first embodiment. [Diagram 2] FIG. 2 is an explanatory diagram showing an example of the configuration of a pixel shift device. [Diagram 3] 6 is a flowchart showing the operation of the projector in the first embodiment. [Figure 4] FIG. 11 is a block diagram showing an example of the configuration of a projection system according to a second embodiment. [Diagram 5] 10 is a flowchart showing the operation of a smart speaker in the second embodiment. [Figure 6] 10 is a flowchart showing the operation of a projector in a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [1. First embodiment] [1-1. Projector configuration] 1 is a block diagram showing an example of the configuration of a projection system 100 according to the first embodiment. The projection system 100 includes a projector 1.

[0011] The projector 1 projects an image onto the screen SC based on image data input to an image input interface 41 (described later) or image data stored in the projector 1. The projector 1 is an example of a display device, and the projecting of an image by the projector 1 is an example of display. In the following description, an image includes a moving image, i.e., an image, and a still image.

[0012] The projector 1 includes a projection device 10 that projects image light PL onto a screen SC, and a drive circuit 20 that drives the projection device 10. The projection device 10 includes a light source 11, a light modulation device 12, and a projection optical system 13. The drive circuit 20 includes a light source drive circuit 21 and a light modulation device drive circuit 22.

[0013] The light source 11 is a lamp light source such as a halogen lamp, a xenon lamp, or an extra-high pressure mercury lamp, or a solid-state light source such as an LED (Light Emitting Diode) or a laser light source. The light source drive circuit 21 turns the light source 11 on and off under the control of the control device 50. The light source drive circuit 21 also adjusts the luminance of the light source 11 under the control of the control device 50.

[0014] The light modulation device 12 includes a light modulation element (not shown). The light modulation element of the light modulation device 12 includes, for example, a transmissive liquid crystal panel. The light modulation element of the light modulation device 12 may be a reflective liquid crystal panel or a digital micromirror device (DMD).

[0015] Light emitted by the light source 11 is separated into three color lights, red light, green light, and blue light, by an optical element (not shown) arranged on the optical path between the light source 11 and the light modulation device 12, and the separated color lights are incident on the light modulation device 12. The light modulation device 12 modulates the light by the light modulation element to generate image light PL. This image light PL is combined by a combining optical system such as a cross dichroic prism, and is output to the projection optical system 13.

[0016] The light modulation device driving circuit 22 is connected to the image processing unit 43. The light modulation device driving circuit 22 drives the light modulation device 12 based on an image signal generated by the image processing unit 43, and draws an image on the light modulation elements of the light modulation device 12 on a frame-by-frame basis.

[0017] The light modulation device driving circuit 22 drives the pixel shift device 16 under the control of the control device 50. The light modulation device driving circuit 22 can adjust at least one of the driving frequency of the pixel shift device 16, which will be described later, and the operating direction of the pixel shift device 16. For example, the light modulation device driving circuit 22 can drive the pixel shift device 16 by switching the driving frequency of the pixel shift device 16 among a plurality of preset stages.

[0018] The projection optical system 13 includes lenses, mirrors, and the like that focus the image light PL on the screen SC. The image light PL is projected onto the screen SC via the projection optical system 13, and a projected image is formed on the screen SC. The screen SC corresponds to an example of a projection surface.

[0019] The optical elements disposed between the light modulation device 12 and the projection optical system 13 include a pixel shifting device 16. The configuration and function of the pixel shifting device 16 will be described later with reference to FIG.

[0020] The projection device 10 includes a cooling fan 15. The cooling fan 15 blows cooling air to cool each part of the projection device 10. The cooling fan 15 mainly cools the light source 11 and the pixel shifting device 16, for example.

[0021] Specifically, the cooling fan 15 may be arranged to blow cooling air directly onto the light source 11 and the pixel shifting device 16, or may be arranged to blow cooling air onto a heat sink (not shown) provided in the projection device 10. The projection device 10 may also be configured so that the cooling air blown by the cooling fan 15 flows through each part including the light source 11 and the pixel shifting device 16. The cooling fan 15 may be, for example, an intake fan that takes in air from outside the housing of the projector 1 and blows it into the inside of the projection device 10. Alternatively, the cooling fan 15 may be an exhaust fan that sucks air out of the projection device 10 and exhausts it to the outside of the housing of the projector 1.

[0022] The projector 1 may include one or more cooling fans in addition to the cooling fan 15. The cooling fans are installed for the purpose of cooling each section including the image processing section 43 and the control device 50 described below. Like the cooling fan 15, the cooling fan may be an intake fan that takes in air from the outside of the housing of the projector 1, or an exhaust fan that exhausts air from the inside of the housing of the projector 1.

[0023] The projector 1 includes an operation unit 31, a remote control receiver 32, an input interface 33, a signal processing unit 35, a microphone 36, a speaker 37, an image input interface 41, an image processing unit 43, and a control device 50. The input interface 33, the signal processing unit 35, the image input interface 41, the image processing unit 43, and the control device 50 are connected to each other via a bus 39 so as to be able to communicate data with each other.

[0024] The operation unit 31 includes various buttons and switches provided on the surface of the housing of the projector 1. For example, the operation unit 31 includes a switch that instructs the start of a voice recognition function. The operation unit 31 generates an operation signal corresponding to the operation of the button or switch, and outputs the operation signal to the input interface 33. The input interface 33 includes a circuit that outputs the operation signal input from the operation unit 31 to the control device 50.

[0025] The remote control light receiving unit 32 includes a light receiving element that receives infrared light, and receives an infrared signal transmitted from the remote control 7. The remote control 7 includes a plurality of switches that are operated by the user, for example, a switch 71 that instructs the start of a voice recognition function. When the switch 71 is operated, the remote control 7 transmits an infrared signal indicating the operation. The remote control light receiving unit 32 decodes the received infrared signal to generate an operation signal. The remote control light receiving unit 32 outputs the generated operation signal to the input interface 33. The input interface 33 includes a circuit that outputs the operation signal input from the remote control light receiving unit 32 to the control device 50.

[0026] There are no limitations on the specific manner in which signals are transmitted and received between the remote control 7 and the remote control light receiving unit 32. The configuration in which the remote control 7 transmits an infrared signal to the remote control light receiving unit 32 is one example. For example, the remote control 7 and the remote control light receiving unit 32 may transmit and receive signals by executing short-range wireless communication such as Bluetooth. Bluetooth is a registered trademark.

[0027] The signal processing unit 35 is connected to a microphone 36 and a speaker 37. The microphone 36 collects sounds outside the housing of the projector 1. The signal processing unit 35 converts the sounds collected by the microphone 36 into digital audio data and outputs it to the control device 50. The signal processing unit 35 drives the speaker 37 based on the digital audio data input from the control device 50, thereby causing the speaker 37 to output sound.

[0028] The signal processing unit 35 may include a digital / analog conversion circuit that converts between digital audio data and an analog audio signal, and an amplifier that amplifies the analog audio signal.

[0029] The image input interface 41 includes a connector and an interface circuit. An image supply device is connected to the image input interface 41 via a cable. For example, the image input interface 41 includes a connector for connecting an HDMI (High-Definition Multimedia Interface) cable, and an interface circuit for receiving image data in the HDMI transmission format. The image input interface 41 may include an antenna and a wireless communication circuit, and may receive image data by performing wireless communication with the image supply device. HDMI is a registered trademark.

[0030] The connectors and interface circuits of the image input interface 41 may be compliant with digital signal transmission standards such as Displayport, HDBaseT, and USB (Universal Serial Bus). The image input interface 41 may also be configured to be capable of receiving analog video signals by including analog video terminals such as an RCA terminal, a VGA terminal, an S terminal, and a D terminal, and a signal processing circuit. The image input interface 41 may be configured to include multiple types of connectors, or multiple connectors of the same type. Displayport and HDBaseT are registered trademarks.

[0031] The image supply device connected to the image input interface 41 is a device that supplies image data to the projector 1. The image supply device is, for example, a media playback device that plays DVDs (Digital Versatile Disks) and Blu-ray discs, or a personal computer. The image supply device outputs image data that complies with the HDMI standard to the projector 1.

[0032] The image processing unit 43 performs image processing on the image data input from the image input interface 41 or the image data stored in the memory 55 under the control of the control device 50. The image processing performed by the image processing unit 43 includes, for example, resolution conversion processing, geometric correction processing, digital zoom processing, and image correction processing for adjusting the color tone and brightness of the image. The image processing unit 43 generates an image signal based on the image data after the image processing, and outputs the image signal to the light modulation device driving circuit 22.

[0033] The control device 50 includes a processor 51 and a memory 55. The memory 55 is a storage device that stores in a nonvolatile manner the programs and data executed by the processor 51. The memory 55 is configured with a magnetic storage device, a semiconductor storage element such as a flash ROM (Read Only Memory), or other types of nonvolatile storage devices. The memory 55 may include a RAM (Random Access Memory) that configures the work area of ​​the processor 51. The memory 55 stores data processed by the control device 50 and a control program 56 executed by the processor 51.

[0034] The processor 51 may be configured as a single processor, or may be configured such that a plurality of processors function as the processor 51. The processor 51 controls each unit of the projector 1 by executing a control program.

[0035] The image processing unit 43 can be configured, for example, by an integrated circuit. The integrated circuit is configured, for example, by an LSI (Large Scale Integration). More specifically, the image processing unit 43 is configured, for example, by an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or the like. The PLD includes, for example, an FPGA (Field-Programmable Gate Array). Furthermore, an analog circuit may be included as part of the configuration of the integrated circuit, or the integrated circuit may be a combination of a processor and an integrated circuit. The combination of a processor and an integrated circuit is called a microcontroller (MCU), a SoC (System-on-a-Chip), a system LSI, a chipset, or the like.

[0036] A frame memory (not shown) may be connected to the image processing unit 43. The frame memory is, for example, configured with a Synchronous Dynamic Random Access Memory (SDRAM). In this case, the image processing unit 43 loads image data input from the image input interface 41 into the frame memory. The image processing unit 43 executes image processing on the image data loaded into the frame memory.

[0037] The control device 50 has a projection control section 52, a voice recognition section 53, and a mode control section 54. These functional sections are generated by the processor 51 executing a control program 56, through cooperation between software and hardware.

[0038] The projection control unit 52 selects an image source to be projected from image data input from an image supply device connected to the image input interface 41 and image data stored in the memory 55. The projection control unit 52 controls the pixel shift device 16, the light source drive circuit 21, the light modulation device drive circuit 22, and the image processing unit 43 to cause the projection device 10 to project an image based on the selected image source onto the screen SC.

[0039] The projection control unit 52 turns on and off the light source 11 by controlling the light source drive circuit 21. Furthermore, the projection control unit 52 adjusts the luminance of the light source 11 by controlling the light source drive circuit 21. The projection control unit 52 operates the pixel shift device 16 by controlling the light source drive circuit 21. The projection control unit 52 rotates and stops the cooling fan 15 in accordance with the lighting state of the light source 11, and adjusts the rotation speed of the cooling fan 15. In other words, the rotation speed of the cooling fan 15 is the number of rotations per unit time.

[0040] The voice recognition unit 53 executes a voice recognition process on the digital voice data input from the signal processing unit 35 to the control device 50. When any of the following events occurs: the switch 71 of the remote control 7 is operated, the switch of the operation unit 31 is operated, and the microphone 36 detects an activation word, the voice recognition unit 53 executes the voice recognition process using these events as a trigger. The voice recognition unit 53 detects a voice command from the digital voice data. The voice recognition unit 53 controls each part of the projector 1 according to the detected voice command. For example, when the voice recognition unit 53 detects a voice command instructing switching of the image source, the voice recognition unit 53 causes the projection control unit 52 to switch the image source. Also, for example, when the voice recognition unit 53 detects a voice command instructing mute of the image, the voice recognition unit 53 causes the projection control unit 52 to stop projecting the image light PL on the screen SC. In this case, the projection control unit 52 turns off the light source 11 or reduces the luminance of the light source 11, and causes the light modulation device 12 to generate monochromatic image light PL over the entire surface.

[0041] The mode control unit 54 switches the operation mode of the projector 1. The operation modes of the projector 1 include, for example, a first mode, a second mode, and a third mode. The first mode is an operation mode in which the image light PL is projected by the projection device 10. The second mode is an operation mode in which the luminance of the light source 11 is lower and the rotation speed of the cooling fan 15 is lower than in the first mode. The second mode may be an operation mode in which the operation state of the pixel shift device 16 is lower than in the first mode. The low-load operation state of the pixel shift device 16 is, for example, a state in which the drive frequency of the pixel shift device 16 is lower than in the first mode. Also, for example, a state in which the drive direction of the pixel shift device 16 is more restricted than in the first mode.

[0042] In the second mode, only the control may be performed to lower the luminance of the light source 11 and to lower the rotation speed of the cooling fan 15 compared to the first mode, or only the control may be performed to lower the operating state of the pixel shift device 16 in load compared to the first mode, or both of these two controls may be performed. The second mode may execute at least one of these two controls. That is, the second mode may be an operation mode in which the luminance of the light source 11 is lower and the rotation speed of the cooling fan 15 is lower compared to the first mode.

[0043] The third mode is an operation mode in which the luminance of the light source 11 is lower and the rotation speed of the cooling fan 15 is lower than in the second mode. The third mode may be an operation mode in which the operation state of the pixel shift device 16 is lower than in the second mode. For example, the third mode is a state in which the drive frequency of the pixel shift device 16 is lower than in the second mode. For example, the third mode is a state in which the drive direction of the pixel shift device 16 is more limited than in the second mode. The third mode may be an operation mode in which the projection device 10 does not project the image light PL.

[0044] The cooling fan 15 is rotated and stopped under the control of the projection control unit 52. The mode control unit 54 sets the rotation speed of the cooling fan 15 for the projection control unit 52 in accordance with the operation mode of the projector 1. As a result, the cooling fan 15 is driven at a rotation speed corresponding to the operation mode.

[0045] [1-2. Pixel shift device configuration] 2 is an explanatory diagram showing an example of the configuration of the pixel shift device 16. The pixel shift device 16 is provided corresponding to the light modulation elements of the light modulation device 12. For example, when the light modulation device 12 includes three liquid crystal panels corresponding to red light, green light, and blue light, respectively, as light modulation elements, the projector 1 includes three pixel shift devices 16 corresponding to the three liquid crystal panels.

[0046] The pixel shift device 16 includes a plate-like optical element 161 having light-transmitting properties, and actuators 162 and 163 that operate the optical element 161. The optical element 161 is disposed on the optical path of the image light PL, and the image light PL passes through the optical element 161 and enters the projection optical system 13. For ease of explanation, FIG. 2 is a schematic diagram in which the light modulation device 12 and the projection optical system 13 are omitted.

[0047] The optical element 161 is supported so as to be swingable about an axis AX1. The optical element 161 is also supported so as to be swingable about an axis AX2. The axes AX1 and AX2 are imaginary axes that indicate the swing direction of the optical element 161, and are perpendicular to each other at the center of the optical element 161.

[0048] The actuators 162 and 163 are driven by the optical modulator drive circuit 22. The actuator 162 can move the optical element 161 so as to tilt about an axis AX1. The actuator 162 causes the optical element 161 to rotate in a first direction about the axis AX1 and in a second direction that is opposite to the first direction.

[0049] In this embodiment, the optical element 161 tilts about the axis AX1, so that the image light PL passing through the optical element 161 is shifted in the D1 direction and the D2 direction shown in Fig. 2. The D1 direction and the D2 direction are, for example, vertical directions in the plane of the screen SC, and are opposite to each other.

[0050] The actuator 163 is capable of moving the optical element 161 so as to tilt about an axis AX2. The optical element 161 is rotated by the actuator 163 in a first direction about the axis AX2 and in a second direction that is opposite to the first direction.

[0051] As the optical element 161 tilts about the axis AX2, the image light PL passing through the optical element 161 is shifted in the D3 direction and the D4 direction shown in Fig. 2. The D3 direction and the D4 direction are, for example, horizontal directions in the plane of the screen SC and are opposite to each other.

[0052] The actuators 162 and 163 tilt the optical element 161, and thereby the projected image P projected onto the screen SC is shifted in the directions D1, D2, D3, and D4. Tilting the optical element 161 to shift the position of the projected image P on the screen SC is referred to here as pixel shift.

[0053] The pixel shift device 16 executes pixel shifting in synchronization with, for example, the frame period projected by the projection apparatus 10. The pixel shifting amount is set to 1 / 2 or 1 / 4 of the size of the pixels PX constituting the projection image P, and the pixel shifting device 16 executes pixel shifting for each frame of the projection image P to shift the projection image P, thereby increasing the apparent resolution of the projection image P. This allows the projector 1 to increase the resolution of the projection image P in a pseudo manner.

[0054] In the projector 1, the execution state of pixel shifting by the pixel shifting device 16 can be switched between at least two stages, and preferably between three stages.

[0055] The pixel shifting execution state of the pixel shifting device 16 is switchable among, for example, a first stage, a second stage, and a third stage.

[0056] As an example, it is assumed that the operation speed of the pixel shift device 16 is provided with a first stage, a second stage, and a third stage. In this case, the drive speed of the actuators 162, 163 is slower in the second stage than in the first stage. The drive speed of the actuators 162, 163 is slower in the third stage than in the second stage. Also, the third stage may be a state in which the actuators 162, 163 are stopped. The slower the drive speed of the actuators 162, 163, the less the operating noise caused by the actuators 162, 163.

[0057] As another example, it is envisaged that the pixel shifting device 16 has a first, second and third resolution stage. In this case, the second stage has more limited operating directions of the actuators 162 and 163 than the first stage. Specifically, the actuator 162 is operable in the first stage to transition between a state in which the projected image P is shifted in the D1 direction, a state in which the projected image P is shifted in the D2 direction, and a state in which the projected image P is not shifted. Also, the actuator 163 is operable in the first stage to transition between a state in which the projected image P is shifted in the D3 direction, a state in which the projected image P is shifted in the D4 direction, and a state in which the projected image P is not shifted. On the other hand, in the second stage, the actuator 162 is operable to transition between a state in which the projected image P is shifted in the D1 direction, and a state in which the projected image P is not shifted. Also, the actuator 163 is operable to transition between a state in which the projected image P is shifted in the D3 direction, and a state in which the projected image P is not shifted. In this case, the apparent resolution of the projected image P is lower in the second stage than in the first stage. In the second stage, the range in which the actuators 162, 163 displace the optical element 161 is narrower than in the first stage, and so the level of the operating range of the actuators 162, 163 is low. As a result, the operating noise of the actuators 162, 163 is smaller in the second stage than in the first stage. Furthermore, in the third stage, it is possible to stop the actuators 162, 163. When the actuators 162, 163 are stopped, the apparent resolution of the projected image P becomes lower than in the second stage. Furthermore, in the third stage, the operating noise of the actuators 162, 163 is smaller than in the second stage.

[0058] The pixel shift device 16 executes pixel shifting under the control of the projection control unit 52 . When the first mode is executed, the mode control unit 54 instructs the projection control unit 52 to set the operation state of the pixel shift device 16 to the first stage. When the second mode is executed, the mode control unit 54 instructs the projection control unit 52 to set the operation state of the pixel shift device 16 to the second stage. Furthermore, when the third mode is executed, the mode control unit 54 sets the operation state of the pixel shift device 16 to the third stage.

[0059] [1-3. Projector operation] 3 is a flowchart showing the operation of the projector 1 in the first embodiment. The operation of FIG.

[0060] The projector 1 starts the operation of FIG. 3 after starting up or after starting to project the projection image P based on the image source. The projector 1 starts detecting the activation word in step S11. In detail, the projector 1 starts a process of analyzing the digital voice data of the voice collected by the microphone 36 by the voice recognition unit 53 in step S11, and detects that the activation word has been uttered. The activation word is a voice that is predetermined for the user to operate the projector 1 by voice. After step S11, the voice recognition unit 53 constantly detects whether the voice collected by the microphone 36 includes the activation word. The voice recognition unit 53 may monitor whether the user has uttered the activation word by converting the digital voice data of the voice collected by the microphone 36 into text data. The voice recognition unit 53 may also monitor whether the user has uttered the activation word based on whether the digital voice data includes a specific pattern corresponding to the activation word.

[0061] In step S12, the mode control unit 54 of the projector 1 sets the operation mode of the projector 1 to the first mode. In step S13, the projector 1 determines whether or not the activation word is detected. If the activation word is detected (step S13; YES), the projector 1 proceeds to step S15, which will be described later.

[0062] When it is determined that the activation word has not been detected (step S13; NO), the projector 1 proceeds to step S14. In step S14, the projector 1 determines whether or not the input interface 33 has detected a switch operation that instructs voice recognition processing. Specifically, in step S14, the projector 1 determines whether or not the switch 71 of the remote control 7 or the switch of the operation unit 31 that instructs the start of the voice recognition function has been operated.

[0063] When it is determined that the switch operation instructing the voice recognition process has not been performed (step S14; NO), the projector 1 returns to step S13. When it is determined that a switch operation has been performed to instruct voice recognition processing (step S14; YES), the projector 1 proceeds to step S15.

[0064] In step S15, the projector 1 switches the operation mode of the projector 1 to the second mode. This changes the luminance of the light source 11 to a lower luminance than in the first mode, and changes the rotation speed of the cooling fan 15 to a lower speed than in the first mode. Also, the operation speed of the pixel shift device 16 is switched to a lower speed than in the first mode.

[0065] After step S15, the projector 1 executes a voice recognition process. In detail, after step S15, the projector 1 starts a process of analyzing the digital voice data of the voice collected by the microphone 36 by the voice recognition unit 53, and monitors whether or not the user has uttered a voice command.

[0066] Next, in step S16, the projector 1 determines whether or not a voice command has been detected by the voice recognition unit 53. If a voice command has been detected (step S16; YES), the projector 1 proceeds to step S17. In step S17, the projector 1 executes control according to the voice command detected by the voice recognition unit 53, and then returns to step S12.

[0067] When it is determined that a voice command has not been detected (step S16; NO), the projector 1 proceeds to step S18 and calculates the voice recognition rate of the voice recognition unit 53. The voice recognition rate indicates the rate at which voice recognition by the voice recognition unit 53 was successful. The voice recognition rate is merely one example of an index calculated in step S18. In step S18, the projector 1 may calculate an index indicating whether or not voice recognition by the voice recognition unit 53 is being performed well, that is, the accuracy of voice recognition. Indicators of the accuracy of voice recognition include the voice recognition rate, the accuracy of voice recognition, and the average time until voice recognition is successful after the processing of step S15.

[0068] In step S19, the projector 1 determines whether the index calculated in step S18 is lower than a preset threshold value. If it is determined that the index calculated in step S18 is lower than the threshold value (step S19; YES), the projector 1 proceeds to step S20. In step S20, the projector 1 switches the operation mode of the projector 1 to the third mode, and proceeds to step S22.

[0069] When it is determined that the index calculated in step S18 is not lower than the threshold value (step S19; NO), the projector 1 proceeds to step S21. In step S21, the projector 1 switches the operation mode of the projector 1 to the second mode, and proceeds to step S22.

[0070] In step S22, the projector 1 determines whether or not a termination condition for the operation related to voice recognition is satisfied. The termination conditions include an instruction to terminate the voice recognition process by operating the remote control 7 or the operation unit 31, a state in which the user does not make a voice being continued for a preset time, an instruction to terminate the voice recognition process by a voice command from the user, etc.

[0071] When it is determined that the end condition is not met (step S22; NO), the projector 1 returns to step S16. When it is determined that the end condition is met (step S22; YES), the projector 1 ends this process.

[0072] [2. Second embodiment] [2-1. Projection system configuration] 4 is a block diagram showing an example of the configuration of a projection system 100A according to the second embodiment. The projection system 100A includes a projector 1A and a smart speaker 8 connected to the projector 1A.

[0073] Like the projector 1 described in the first embodiment, the projector 1A is a display device that displays an image on the screen SC by generating image light PL and projecting it onto the screen SC.

[0074] The projector 1A is configured by adding a communication interface 45 to the projector 1 described in the first embodiment, and by including a control device 50A instead of the control device 50. The control device 50A includes an input receiving unit 57 as a functional unit in addition to the control device 50. Components of the projector 1A that are common to the projector 1 are given the same reference numerals and will not be described.

[0075] The communication interface 45 includes a connector to which a communication cable is connected and a communication circuit, and executes data communication with the smart speaker 8 according to the control of the control device 50. For example, the communication interface 45 may include a configuration including a USB connector and a USB interface circuit, or a configuration including a connector and an interface circuit that conforms to the Ethernet standard. The communication interface 45 may also be a wireless communication device that performs wireless data communication using a wireless LAN (Local Area Network) or Bluetooth. The wireless communication device includes, for example, an antenna, an RF circuit, a baseband circuit, and the like. Ethernet is a registered trademark.

[0076] The input reception unit 57 included in the control device 50 is a functional unit realized by executing the control program 56 by the processor 51. The input reception unit 57 receives data received from the smart speaker 8 by the communication interface 45, and executes an operation according to the received data.

[0077] The smart speaker 8 is a device installed outside the projector 1. The smart speaker 8 includes an SP control device 80, a speaker 85, a microphone 86, and a switch 87.

[0078] The SP control device 80 includes a processor 81 and a memory 82. The memory 82 is a storage device that stores in a nonvolatile manner the programs and data executed by the processor 81. The memory 82 is configured from a magnetic storage device, a semiconductor storage element such as a flash ROM, or other types of nonvolatile storage devices. The memory 82 may include a RAM that configures the work area of ​​the processor 81. The memory 82 stores data processed by the SP control device 80 and control programs executed by the processor 81.

[0079] The processor 81 may be configured as a single processor, or may be configured with multiple processors functioning as the processor 81. The processor 81 executes a control program to control each part of the smart speaker 8.

[0080] The SP control device 80 is connected to a speaker 85, a microphone 86, and a switch 87. The microphone 86 collects sounds outside the housing of the smart speaker 8. The SP control device 80 converts the voice collected by the microphone 86 into digital voice data and executes voice recognition processing based on the digital voice data. The SP control device 80 constantly monitors, for example, whether or not the user has spoken an activation word based on the voice collected by the microphone 86. The SP control device 80 corresponds to an example of a voice recognition unit.

[0081] When the SP control device 80 detects that the voice collected by the microphone 86 contains an activation word, the SP control device 80 transmits a recognition start signal for notifying the start of voice recognition processing to the projector 1A.

[0082] The switch 87 is a switch operated by the user, for example, a switch for instructing the start of a voice recognition function. When the SP control device 80 detects that the switch 87 has been operated, it transmits a recognition start signal, which notifies the start of voice recognition processing, to the projector 1A.

[0083] After transmitting the recognition start signal, the SP control device 80 executes voice recognition processing based on the voice collected by the microphone 86. When the SP control device 80 recognizes a voice command instructing an operation of the projector 1A through the voice recognition processing, it transmits the recognized voice command to the projector 1.

[0084] The projector 1A detects, via the input receiving unit 57, a recognition start signal or a voice command that the communication interface 45 receives from the smart speaker 8. When the input receiving unit 57 receives a recognition start signal via the communication interface 45, the input receiving unit 57 causes the mode control unit 54 to transition the operation mode of the projector 1A from the first mode to the second mode. This makes it possible to reduce the operating noise of the projector 1A while the smart speaker 8 is executing the voice recognition process.

[0085] Furthermore, while the smart speaker 8 is connected to the communication interface 45, the projector 1A does not perform voice recognition processing on the voice collected by the microphone 36. In this case, the smart speaker 8 performs voice recognition processing on the user's voice and detects a voice command. When the smart speaker 8 transmits a voice command, the projector 1A receives the voice command and executes control based on the voice command.

[0086] [2-2. Projection system operation] Fig. 5 is a flowchart showing the operation of the smart speaker 8 in the second embodiment. Fig. 6 is a flowchart showing the operation of the projector 1A in the second embodiment. The operation of the projection system 100A will be described with reference to these figures.

[0087] The operations of FIG. The smart speaker 8 starts the operation of FIG. 5 after being started or connected to the projector 1A. The smart speaker 8 starts detecting the activation word in step S31. In detail, in step S31, the smart speaker 8 starts a process of analyzing the digital audio data of the voice collected by the microphone 86 by the SP control device 80, and detects that the activation word has been uttered. After step S31, the SP control device 80 constantly detects whether the voice collected by the microphone 86 includes the activation word. The voice recognition unit 53 may monitor whether the user has uttered the activation word by converting the digital audio data of the voice collected by the microphone 86 into text data. The voice recognition unit 53 may also monitor whether the user has uttered the activation word based on whether the digital audio data includes a specific pattern corresponding to the activation word.

[0088] In step S32, the smart speaker 8 determines whether or not the activation word is detected. If the activation word is detected (step S32; YES), the smart speaker 8 proceeds to step S34, which will be described later.

[0089] When it is determined that the activation word has not been detected (step S32; NO), the smart speaker 8 proceeds to step S33. In step S33, the smart speaker 8 determines whether or not the operation of the switch 87 has been detected.

[0090] If it is determined that the switch operation has not been performed (step S33; NO), the smart speaker 8 returns to step S32. If it is determined that the switch operation has been performed (step S33; YES), the smart speaker 8 proceeds to step S34.

[0091] In step S34, the smart speaker 8 transmits a recognition start signal to the projector 1A to instruct the projector 1A to start voice recognition. As described below, the projector 1A switches the operation mode to the second mode, triggered by receiving the recognition start signal. This reduces the operating noise of the projector 1A, and the projector 1A enters a state suitable for voice recognition.

[0092] Next, in step S35, the smart speaker 8 determines whether or not a voice command is detected. If a voice command is detected (step S35; YES), the smart speaker 8 proceeds to step S36. In step S36, the smart speaker 8 transmits the detected voice command to the projector 1A.

[0093] If it is determined that a voice command has not been detected (step S35; NO), the smart speaker 8 proceeds to step S37 to calculate the voice recognition rate of the voice recognition unit 53. Here, the voice recognition rate indicates the percentage of times that the SP control device 80 succeeds in voice recognition. The voice recognition rate is merely one example of an index calculated in step S37. In step S37, the smart speaker 8 calculates an index indicating whether voice recognition is being performed well, that is, the accuracy of voice recognition. Indicators of the accuracy of voice recognition include the voice recognition rate, the accuracy of voice recognition, and the average time until voice recognition is successful after the processing of step S34.

[0094] In step S38, the smart speaker 8 determines whether the index calculated in step S38 is lower than a preset threshold. If it is determined that the index calculated in step S37 is lower than the threshold (step S38; YES), the smart speaker 8 proceeds to step S39. In step S39, the smart speaker 8 generates a recognition rate warning signal and transmits it to the projector 1A, and proceeds to step S41.

[0095] If it is determined that the index calculated in step S37 is not lower than the threshold value (step S38; NO), the smart speaker 8 proceeds to step S40. In step S40, the smart speaker 8 generates a recognition rate confirmation signal and transmits it to the projector 1A, and proceeds to step S41.

[0096] In step S41, the smart speaker 8 determines whether or not a termination condition for the operation related to voice recognition is satisfied. The termination condition may be an instruction to terminate the voice recognition process by operating the switch 87, a state in which the user does not make a voice for a preset period of time, or an instruction to terminate the voice recognition process by a voice command from the user.

[0097] If it is determined that the termination condition is not satisfied (step S41; NO), the smart speaker 8 returns to step S35. If it is determined that the termination condition is satisfied (step S41; YES), the smart speaker 8 generates a recognition end signal and transmits it to the projector 1A, and ends this process.

[0098] The operation of FIG. 6 is executed by a control device 50A. After projector 1A is started up or after it starts projecting a projection image P based on an image source, projector 1A starts the operation of FIG. 6. In step S51, projector 1A checks whether a smart speaker 8 is connected to communication interface 45. Here, if projector 1A cannot check whether a smart speaker 8 is connected, projector 1A may execute the operation of FIG. 3.

[0099] In step S52, the projector 1A turns off the operation of the microphone 36 included in the projector 1A. Specifically, the projector 1A stops processing based on the digital audio data that the signal processing unit 35 inputs to the control device 50A.

[0100] Next, in step S53, the projector 1A sets the operation mode of the projector 1A to the first mode by the mode control unit 54. Next, in step S54, the projector 1A determines whether or not a recognition start signal has been received from the smart speaker 8. If the recognition start signal has been received (step S54; YES), the projector 1A proceeds to step S56, which will be described later.

[0101] When it is determined that the recognition start signal has not been received (step S54; NO), the projector 1A proceeds to step S55. In step S55, the projector 1A determines whether or not the input interface 33 has detected a switch operation that instructs voice recognition processing. Specifically, in step S55, the projector 1A determines whether or not the switch 71 of the remote control 7 or the switch of the operation unit 31 that instructs the start of the voice recognition function has been operated.

[0102] When it is determined that a switch operation to instruct voice recognition processing has not been performed (step S55; NO), the projector 1A returns to step S54. When it is determined that a switch operation has been performed to instruct voice recognition processing (step S55; YES), the projector 1A proceeds to step S56.

[0103] In step S56, the projector 1A switches the operation mode of the projector 1A to the second mode. This changes the luminance of the light source 11 to a lower luminance than in the first mode, and changes the rotation speed of the cooling fan 15 to a lower speed than in the first mode. Also, the operation speed of the pixel shift device 16 is switched to a lower speed than in the first mode.

[0104] Next, in step S57, the projector 1A determines whether or not a voice command has been received from the smart speaker 8. If a voice command has been received (step S57; YES), the projector 1A proceeds to step S58. In step S58, the projector 1A executes control according to the voice command received from the smart speaker 8, and then returns to step S53.

[0105] When it is determined that a voice command has not been received (step S57; NO), the projector 1A proceeds to step S59 and determines whether or not a recognition rate warning signal has been received from the smart speaker 8.

[0106] When the recognition rate warning signal has not been received (step S59; NO), the projector 1A proceeds to step S61. When the recognition rate warning signal is received (step S59; YES), the projector 1A proceeds to step S60. In step S60, the projector 1A switches the operation mode of the projector 1A to the third mode, and proceeds to step S61.

[0107] In step S61, the projector 1A determines whether or not a recognition rate confirmation signal has been received from the smart speaker 8. If the recognition rate confirmation signal has not been received (step S61; NO), the projector 1A proceeds to step S63.

[0108] When the recognition rate confirmation signal is received (step S61; YES), the projector 1A proceeds to step S62, where it switches the operation mode of the projector 1A to the second mode, and proceeds to step S63.

[0109] In step S63, the projector 1A determines whether or not a recognition end signal has been received from the smart speaker 8. If the recognition end signal has not been received (step S63; NO), the projector 1A returns to step S57. If the recognition end signal has been received (step S63; YES), the projector 1A ends this process.

[0110] [3. Operation of the embodiment] As described above, the control method of the projector 1, 1A described in the first and second embodiments includes receiving an operation related to the operation of the projector 1 including the light source 11 and the cooling fan 15. This control method includes switching the operation of the projector 1, 1A from the first mode to the second mode in response to the operation. This control method includes controlling the projector 1, 1A based on a result of voice recognition of a user's voice received while the projector 1, 1A is operating in the second mode. This control method makes the output of the light source 11 in the second mode lower than the output of the light source 11 in the first mode, and makes the rotation speed of the cooling fan 15 in the second mode lower than the rotation speed of the cooling fan 15 in the first mode.

[0111] According to the control method for the projectors 1, 1A, the rotation speed of the cooling fan 15 is lowered while performing voice recognition, thereby reducing the operating noise of the projectors 1, 1A. Therefore, by suppressing the influence of the operating noise of the projectors 1, 1A, it is possible to prevent a decrease in the accuracy of the voice recognition, and it is possible to improve the operability when the user operates the projectors 1, 1A by voice. Furthermore, by accepting operations related to the operation of the projectors 1, 1A, the operating noise of the projectors 1, 1A is reduced at an appropriate timing. Therefore, when the voice recognition process is not performed, the rotation speed of the cooling fan 15 is not lowered, and the projectors 1, 1A can be appropriately cooled.

[0112] The above control method switches the operation of the projector 1, 1A to the third mode when the accuracy of voice recognition for the user's voice is lower than a predetermined threshold while the projector 1, 1A is operating in the second mode. The third mode is an operation mode in which the output of the light source 11 is lower than the output of the light source 11 in the second mode, and the rotation speed of the cooling fan 15 is lower than the rotation speed of the cooling fan 15 in the second mode. This makes it possible to further suppress the operation sound of the projector 1, 1A when the accuracy of the voice recognition is low, compared to the second mode. Therefore, it is possible to increase the accuracy of the voice recognition even in an environment where the accuracy of the voice recognition is likely to decrease, such as when there is an influence of environmental sounds different from the operation sounds of the projector 1, 1A, or when the position where the microphone 36, 86 collects the sound is close to the projector 1, 1A. Therefore, it is possible to improve the operability when the user operates the projector 1, 1A by voice.

[0113] The control method for the projector 1, 1A includes accepting an operation related to the operation of the projector 1, 1A having a pixel shift device 16 that shifts the image light PL projected onto the screen SC, and switching the operation of the projector 1, 1A from a first mode to a second mode in response to the operation. This control method also includes controlling the projector 1, 1A based on a result of voice recognition of a user's voice accepted while the projector 1, 1A is operating in the second mode. In this control method, the second mode is an operation mode in which the operating speed or operating range of the pixel shift device 16 is reduced compared to the first mode.

[0114] According to the control method for the projectors 1, 1A, the operation sound of the projectors 1, 1A is reduced by lowering the operation speed or operation range of the pixel shift device 16 while performing voice recognition. Therefore, by suppressing the influence of the operation sound of the projectors 1, 1A, it is possible to prevent a decrease in the accuracy of voice recognition, and it is possible to improve operability when the user operates the projectors 1, 1A by voice. In addition, by accepting operations related to the operation of the projectors 1, 1A, the operation sound of the projectors 1, 1A is reduced at an appropriate timing. Therefore, since the operation speed or operation range of the pixel shift device 16 is not limited when voice recognition processing is not performed, a projection image P with a high sense of resolution can be projected.

[0115] In the above control method, when the accuracy of voice recognition for a user's voice is lower than a predetermined threshold while the projectors 1, 1A are operating in the second mode, the operation of the projectors 1, 1A is switched to a third mode in which the operating speed or operating range of the pixel shift device 16 is lower than that of the second mode. As a result, when the accuracy of voice recognition is low, the operating sounds of the projectors 1, 1A can be suppressed even more than in the second mode. Therefore, even in an environment where the accuracy of voice recognition is likely to decrease, such as when there is an influence of environmental sounds different from the operating sounds of the projectors 1, 1A, or when the position where the microphones 36, 86 collect sound is close to the projectors 1, 1A, the accuracy of voice recognition can be improved. Therefore, the operability when the user operates the projectors 1, 1A by voice can be improved.

[0116] The above control method accepts operations related to the operation of the projectors 1, 1A when the user utters a specific activation word. In this case, by having the user utter the activation word, the operating noise of the projectors 1, 1A can be reduced, and an environment suitable for voice recognition can be realized. Therefore, it is possible to improve operability when the user operates the projectors 1, 1A by voice.

[0117] The above display method accepts operations related to the operation of the projectors 1, 1A when the user performs a predetermined operation. In this case, the user operates the operation unit 31, the switch 71 of the remote control 7, or the switch 87 of the smart speaker 8 to reduce the operating noise of the projectors 1, 1A and realize an environment suitable for voice recognition. Therefore, it is possible to improve operability when the user operates the projectors 1, 1A by voice.

[0118] The projection system 100 includes a projector 1 having a light source 11 and a cooling fan 15, a voice recognition unit 53 that detects a user's voice by a microphone 36 and performs voice recognition on the user's voice, and a control device 50 having a mode control unit 54 that switches the operation of the projector 1 from a first mode to a second mode in response to an operation related to the operation of the projector 1. The control device 50 controls the projector 1 based on the result of voice recognition of the user's voice received by the voice recognition unit 53 while the projector 1 is operating in the second mode, to make the output of the light source 11 in the second mode lower than the output of the light source 11 in the first mode, and to make the rotation speed of the cooling fan 15 in the second mode lower than the rotation speed of the cooling fan 15 in the first mode.

[0119] According to the projection system 100, the rotation speed of the cooling fan 15 is lowered while performing voice recognition, thereby reducing the operating noise of the projector 1. Therefore, by suppressing the influence of the operating noise of the projector 1, it is possible to prevent a decrease in the accuracy of the voice recognition, and it is possible to improve the operability when the user operates the projector 1 by voice. Furthermore, by accepting operations related to the operation of the projector 1, the operating noise of the projector 1 is reduced at an appropriate timing. Therefore, when the voice recognition process is not performed, the rotation speed of the cooling fan 15 is not lowered, and the projector 1 can be cooled appropriately.

[0120] The projection system 100 includes a projector 1 having a projection device 10 that projects image light PL onto a screen SC and a pixel shift device 16 that shifts the image light PL, and a voice recognition unit 53 that detects a user's voice by a microphone 36 and performs voice recognition on the user's voice. The projection system 100 includes a control device 50 having a mode control unit 54 that switches the operation of the projector 1 from a first mode to a second mode in response to an operation related to the operation of the projector 1. The control device 50 controls the projector 1 based on the result of voice recognition of the user's voice received by the voice recognition unit 53 while the projector 1 is operating in the second mode. In the second mode, the mode control unit 54 reduces the operating speed or operating range of the pixel shift device 16 to be lower than that in the first mode.

[0121] According to the projection system 100, the operating sound of the projector 1 is reduced by lowering the operating speed or operating range of the pixel shift device 16 while performing voice recognition. Therefore, by suppressing the influence of the operating sound of the projector 1, it is possible to prevent a decrease in the accuracy of voice recognition, and it is possible to improve operability when the user operates the projector 1 by voice. In addition, by accepting operations related to the operation of the projector 1, the operating sound of the projector 1 is reduced at an appropriate timing. Therefore, since the operating speed or operating range of the pixel shift device 16 is not limited when voice recognition processing is not performed, it is possible to project a projection image P with a high sense of resolution.

[0122] Projection system 100A includes projector 1A having a light source 11 and cooling fan 15, an SP control device 80 that detects a user's voice by a microphone 86 and performs voice recognition on the user's voice, and a control device 50A having a mode control unit 54 that switches the operation of projector 1A from a first mode to a second mode in response to an operation related to the operation of projector 1A. Based on the result of the voice recognition of the user's voice received by SP control device 80 while projector 1A is operating in the second mode, control device 50A controls projector 1A to make the output of light source 11 in the second mode lower than the output of light source 11 in the first mode, and to make the rotation speed of cooling fan 15 in the second mode lower than the rotation speed of cooling fan 15 in the first mode.

[0123] According to projection system 100A, the rotation speed of cooling fan 15 is lowered while voice recognition is being performed, thereby reducing the operating noise of projector 1A. Therefore, by suppressing the influence of the operating noise of projector 1A, it is possible to prevent a decrease in the accuracy of voice recognition, and it is possible to improve operability when the user operates projector 1A by voice. Furthermore, by accepting operations related to the operation of projector 1A, the operating noise of projector 1A is reduced at an appropriate timing. Therefore, when voice recognition processing is not being performed, the rotation speed of cooling fan 15 is not lowered, and projector 1A can be appropriately cooled.

[0124] The projection system 100A includes a projector 1A having a projection device 10 that projects image light PL onto a screen SC and a pixel shift device 16 that shifts the image light PL, and an SP control device 80 that detects a user's voice by a microphone 86 and performs voice recognition on the user's voice. The projection system 100A includes a control device 50A having a mode control unit 54 that switches the operation of the projector 1A from a first mode to a second mode in response to an operation related to the operation of the projector 1A. The control device 50A controls the projector 1A based on the result of the voice recognition of the user's voice received by the SP control device 80 while the projector 1A is operating in the second mode. In the second mode, the mode control unit 54 reduces the operating speed or operating range of the pixel shift device 16 to be lower than that in the first mode.

[0125] According to the projection system 100A, the operating sound of the projector 1A is reduced by lowering the operating speed or operating range of the pixel shift device 16 while performing voice recognition. Therefore, by suppressing the influence of the operating sound of the projector 1A, it is possible to prevent a decrease in the accuracy of the voice recognition, and it is possible to improve the operability when the user operates the projector 1A by voice. In addition, by accepting an operation related to the operation of the projector 1A, the operating sound of the projector 1A is reduced at an appropriate timing. Therefore, since the operating speed or operating range of the pixel shift device 16 is not limited when the voice recognition process is not performed, it is possible to project a projection image P with a high sense of resolution.

[0126] [4. Other embodiments] The first and second embodiments described above are preferred embodiments of the present invention, but the present invention is not limited to these and various modifications are possible without departing from the spirit of the present invention.

[0127] For example, in each of the above-described embodiments, the projector 1, 1A is described as having the cooling fan 15 and the pixel shift device 16. In this configuration, in the second mode and the third mode, the rotation speed of the cooling fan 15 and the driving state of the pixel shift device 16 are controlled to be different from those in the first mode, but this is one example. For example, the projector 1, 1A may be configured not to have the pixel shift device 16. In this case, when switching the operation mode of the projector 1, 1A, the projector 1, 1A controls to change the rotation speed of the cooling fan 15, and omits the control related to the driving state of the pixel shift device 16.

[0128] Also, for example, in each of the above-mentioned embodiments, a configuration has been described in which one projector 1, 1A detects a voice command from a user and operates, but there is no limit to the number of projectors 1, 1A. For example, when a voice command from a user is detected by any one of the projectors 1 or the smart speaker 8, multiple projectors 1, 1A may be controlled according to the voice command.

[0129] Also, for example, in a configuration in which the projector 1, 1A includes multiple cooling fans 15, only some of the multiple cooling fans 15 may be controlled to rotate at a lower speed in the second mode than in the first mode. Also, in the third mode, only some of the multiple cooling fans 15 may be controlled to rotate at a lower speed than in the second mode.

[0130] Each functional unit of the projectors 1, 1A, and the projection system 100A shown in Figures 2 and 4 indicates a functional configuration, and the specific implementation form is not particularly limited. In other words, it is not necessarily necessary to implement hardware corresponding to each functional unit individually, and it is of course possible to implement a configuration in which one processor executes a program to realize the functions of multiple functional units. Also, some of the functions realized by software in the above embodiment and modified examples may be realized by hardware, and some of the functions realized by hardware may be realized by software.

[0131] In addition, the processing units in the flowcharts shown in Figures 3 and 6 are divided according to the main processing contents in order to make the processing of the control devices 50 and 50A easier to understand, and the present invention is not limited by the manner in which the processing units are divided or the names of the processing units. The processing of the control devices 50 and 50A can be divided into more processing units according to the processing contents, or one processing unit can be divided so as to include more processes. In addition, the processing order of the above flowcharts is not limited to the example shown in the figures. The same applies to the operation of the SP control device 80 shown in Figure 5.

[0132] The control program 56 executed by the control device 50, 50A can be recorded in a recording medium that is readable by the projector 1, 1A, for example. The recording medium can be a magnetic or optical recording medium or a semiconductor memory device. Specific examples include portable or fixed recording media such as a flexible disk, a CD-ROM (Compact Disk Read Only Memory), a DVD, a Blu-ray Disc, a magneto-optical disk, a flash memory, and a card-type recording medium. In addition, the above-mentioned display control method can be realized by storing these programs in a server device or the like and having the projector 1, 1A download the programs from the server device. Blu-ray is a registered trademark. [Explanation of symbols]

[0133] 1, 1A...projector, 7...remote control, 8...smart speaker, 10...projection device, 11...light source, 12...light modulation device, 13...projection optical system, 15...cooling fan, 16...pixel shift device, 20...drive circuit, 21...light source drive circuit, 22...light modulation device drive circuit, 31...operation unit, 32...remote control light receiving unit, 33...input interface, 35...signal processing unit, 36...microphone, 37...speaker, 39...bus, 41...image input interface, 43...image processing unit, 45...communication interface, 50, 50A...control device position, 51...processor, 52...projection control unit, 53...voice recognition unit, 54...mode control unit, 55...memory, 56...control program, 57...input acceptance unit, 71...switch, 80...SP control device (voice recognition unit), 81...processor, 82...memory, 85...speaker, 86...microphone, 87...switch, 100, 100A...projection system, 161...optical element, 162, 163...actuator, AX1...axis, AX2...axis, P...projected image, PL...image light, PX...pixel, SC...screen (projection surface).

Claims

1. A voice command detection for controlling a projector having a light source and a cooling fan is disclosed. When the activation word for starting the voice command is received, the voice command detection is started. When an operation for changing the operation mode of the projector is received, the operation mode of the projector is changed from the first mode to the second mode. Switching to The projector receives user voice while operating in the second mode. detecting the voice command based on a result of speech recognition for the voice command; and controlling the projector in response to the detected voice command. The output of the light source in the second mode is greater than the output of the light source in the first mode. and the rotation speed of the cooling fan in the second mode is lowered to a lower value than that in the first mode. a rotation speed of the cooling fan being set to a value lower than that of the cooling fan in the control method for a projector.

2. While the projector is operating in the second mode, When the accuracy of the voice recognition is lower than a predetermined threshold, the operation of the projector is controlled by the The output is lower than the output of the light source in the second mode, and the rotation speed of the cooling fan is The rotation speed of the cooling fan is switched to a third mode in which the rotation speed is lower than that of the second mode. The method of controlling a projector according to claim 1 , comprising:

3. A projector having a pixel shifting device that shifts the image light projected onto a projection surface. When a hotword is spoken to start detecting voice commands for control Or, when an operation for starting detection of the voice command is received, the projector switching the operation of the controller from a first mode to a second mode; The projector receives user voice while operating in the second mode. detecting the voice command based on a result of speech recognition for the voice command; and controlling the projector in response to the detected voice command. The second mode is characterized by a faster operation speed or a slower operation speed of the pixel shift device than the first mode. A method of controlling a projector that reduces the operating range.

4. While the projector is operating in the second mode, When the accuracy of the voice recognition is lower than a predetermined threshold, the operation of the projector is controlled by the pixel system. The operating speed or range of the soft device is switched to a third mode that is lower than that of the second mode. The method of controlling a projector according to claim 3 , comprising:

5. a projector having a light source and a cooling fan; A microphone detects a user's voice and performs voice recognition on the user's voice. a voice recognition unit for initiating detection of voice commands for controlling the projector; When the activation word is detected or when an operation is performed to start detection of the voice command a mode control unit that switches the operation of the projector from the first mode to the second mode when and a control device having The control device performs the voice recognition while the projector is operating in the second mode. The voice recognition unit recognizes the voice of the user based on the result of the voice recognition. and controlling the projector in response to the detected voice command. The output of the light source in the second mode is greater than the output of the light source in the first mode. and the rotation speed of the cooling fan in the second mode is lowered to a lower value than that in the first mode. a rotation speed of the cooling fan in the projection system.

6. Projection device for projecting image light onto a projection surface and pixel shifting device for shifting the image light a projector having A microphone detects a user's voice and performs voice recognition on the user's voice. a voice recognition unit and a voice command input unit for initiating detection of a voice command for controlling the projector; When the activation word is detected or when an operation is performed to start detection of the voice command a mode control unit that switches the operation of the projector from the first mode to the second mode when and a control device having The control device performs the voice recognition while the projector is operating in the second mode. The voice recognition unit recognizes the voice of the user based on the result of the voice recognition. and controlling the projector in response to the detected voice command. The mode control unit controls the operation speed of the pixel shift device in the second mode. or a range of operation is reduced from that of the first mode.

7. Receiving an operation related to the operation of a projector having a light source and a cooling fan; Switching the operation of the projector from a first mode to a second mode in response to the operation. And, The projector receives user voice while operating in the second mode. controlling the projector based on a result of speech recognition performed on the input device; While the projector is operating in the second mode, When the accuracy of the voice recognition is lower than a predetermined threshold, the operation of the projector is controlled by the The output is lower than the output of the light source in the second mode, and the rotation speed of the cooling fan is The rotation speed of the cooling fan is switched to a third mode in which the rotation speed is lower than that of the second mode. and The output of the light source in the second mode is greater than the output of the light source in the first mode. and the rotation speed of the cooling fan in the second mode is lowered to a lower value than that in the first mode. a rotation speed of the cooling fan being set to a value lower than that of the cooling fan in the control method for a projector.

8. A projector having a pixel shifting device that shifts image light projected onto a projection surface. Accepting operations related to the operation; Switching the operation of the projector from a first mode to a second mode in response to the operation. And, The projector receives user voice while operating in the second mode. controlling the projector based on a result of speech recognition performed on the input device; While the projector is operating in the second mode, When the accuracy of the voice recognition is lower than a predetermined threshold, the operation of the projector is controlled by the pixel system. The operating speed or range of the soft device is switched to a third mode that is lower than that of the second mode. and The second mode is characterized by a faster operation speed or a slower operation speed of the pixel shift device than the first mode. A method of controlling a projector that reduces the operating range.

Images