JP2011151639A - Projector and method for controlling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a user recognize change of projection modes to check on whether the change should be canceled. <P>SOLUTION: The projector 100 is provided by which projection modes according to a plurality of installation states are selected, and it is equipped with: a projection part 120 which projects a projection image according to a projection mode selected at present based on image data to be input; a projection mode changing part 170 which changes the projection modes; and a mode change checking part 180 which makes the projection part 120 project a mode change checking image for checking on whether the change of the projection modes should be canceled according to the change of the projection mode. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projector capable of selecting projection modes according to a plurality of installation states, and a control method thereof.

  Projectors are widely used to display photos and videos on a large screen or to give presentations. However, if the installation space on the desk cannot be secured due to restrictions on the installation location, the projector is attached to the ceiling via a hanging bracket. It may be fixed to. When the projector is suspended from the ceiling, the projector main body is upside down compared to when it is placed upright (installed on a desk), so the image projection direction must also be changed to the opposite direction. There is.

  For example, Patent Document 1 proposes a projector that can automatically detect the installation direction of the top of the apparatus main body using an angle sensor built in the apparatus main body. In such a projector, even if the projector installed on the desk is changed to a suspended installation from the ceiling, the installation status is immediately detected by the built-in angle sensor, and the projection direction etc. are changed according to the installation status. can do.

JP 2003-295310 A

  However, in the projector disclosed in Patent Document 1, an angle sensor and a processing circuit for processing a signal from the angle sensor have to be provided, which causes a cost increase.

  In order to solve the above problems, the present invention is, as one form, a projector capable of selecting a projection mode corresponding to a plurality of installation states, and is currently selected based on input image data. A projection unit that projects a projection image according to the projection mode, a projection mode change unit that changes the projection mode, and whether or not the change of the projection mode should be canceled in response to the change of the projection mode There is provided a projector comprising: a mode change confirmation unit that projects a mode change confirmation image for confirming whether or not to project onto the projection unit.

  According to such a projector, since the user can surely recognize that the projection mode has been changed and can determine whether to approve or cancel the change, for example, one user can change the projection mode to the normal mode. When the other user starts using the device in the upright position despite the change from the ceiling mode to the ceiling mode, the other user can cancel the projection mode change performed by the previous user.

  In the projector, the projection mode changing unit may indicate a projection mode change flag indicating whether or not the projection mode has been changed in response to the change of the projection mode. The mode change confirmation unit changes the setting, and the mode change confirmation unit performs the mode change confirmation when the projection mode change flag is changed to a setting indicating that the projection mode has been changed. It is preferable to project an image on the projection unit.

  In this way, by projecting the mode change confirmation image in association with a specific operation, for example, a startup operation (power-on operation) or a subsequent setting operation of a projection condition is performed in a projection mode that is not appropriate for the installation state. The user can reliably recognize that the projection mode has been changed and determine whether to approve or cancel the change.

  The projector may further include a storage unit that stores the setting of the projection mode change flag, and the mode change confirmation unit may change the projection mode change flag when the activation operation is performed. It is preferable to project the mode change confirmation image on the projection unit in response to the fact that the setting indicating that the mode change is read from the storage unit.

  Thereby, even if the power is turned off, the projection mode change flag as a record in which the projection mode is changed is retained, so that the user can surely recognize that the projection mode is changed at the next start-up. it can.

  Moreover, the said projector WHEREIN: It is preferable that the said mode change confirmation part projects the said mode change confirmation image containing the confirmation message projected in the direction according to each of the said some projection mode on the said projection part.

  Thereby, even when the mode change confirmation image is projected in an installation state different from the installation state corresponding to the changed projection mode, the user can surely recognize that the projection mode has been changed from the confirmation message.

  Further, in the projector, it is preferable that the mode change confirmation unit projects the mode change confirmation image including an operation content for canceling the change of the projection mode on the projection unit.

  Thereby, the user can not only recognize that the projection mode has been changed from the mode change confirmation image, but can also confirm the operation content for canceling the change.

  The mode change confirmation unit stops the projection of the mode change confirmation image when the operation is not performed for a certain period of time after the mode change confirmation image is projected onto the projection unit, and the changed projection mode It is preferable to project a projection image according to the above.

  Thereby, when the user wants to project a projection image in the changed projection mode, the user can start projection without requiring any special operation.

  According to another aspect of the present invention, there is provided a projector control method in which a plurality of projection modes can be selected, and a projection image corresponding to the currently selected projection mode is obtained based on input image data. A projection stage for projecting, a projection mode changing stage for changing the projection mode, and a mode change confirmation image for confirming whether or not the change of the projection mode should be canceled in response to the change of the projection mode And a mode change confirmation stage for projecting the image on the projection unit.

1 is a schematic diagram of a projector 100 that is an example of an embodiment of the present invention and a remote controller 200 that controls the projector 100. FIG. The functional block diagram of the projector 100 and the remote controller 200 is shown. 3 is an example of a menu screen projected by the projector 100. An example of a projection mode change screen is shown. An example of the message projected when the projection mode is changed from the normal mode to the ceiling mode is shown. An example of a mode change confirmation image is shown. (a) And (b) is a figure which shows the relationship of the image projected by the case where the change operation of a projection mode is approved, and the case where it cancels. An example of an operation flow of the projector 100 when a projection mode change operation is performed is shown. An example of an operation flow of a projection operation by the projector 100 is shown.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. However, the following embodiment does not limit the invention according to the claims, and all combinations of features in the embodiment are based on the invention. It is not always essential to the solution.

  FIG. 1 is a schematic diagram of a projector 100 that is an example of an embodiment of the present invention and a remote controller 200 that controls the projector 100. FIG. 2 is a functional block diagram of the projector 100 and the remote controller 200. The projector 100 is a device that can project a projection image generated based on image data input wirelessly or by wire to a projection surface such as a screen. The remote controller 200 (denoted as “RC” in FIG. 2). Remote control is performed by wirelessly transmitting various operation signals from. The projector 100 is also operated through an operation panel (not shown) of the main body.

  The remote controller 200 is a wireless communication terminal that can be carried by a user, for example, and has a power button 211, a menu button 212, an escape button 213, a scroll button 214, a plurality of character / number input buttons 215, a mute on the main body surface. Operation buttons such as a button 216 and a determination (selection) button 217 are arranged. In addition, the remote controller 200 is provided with a display unit 200 that displays operation details and the like. In this remote controller 200, for example, an operation signal is generated based on the operation content input by the user pressing these operation buttons, and the operation signal is transmitted from a transmission unit (not shown) of the remote controller 200.

  The projector 100 includes a lamp 110, an optical unit 111, a liquid crystal panel driving unit 112, an operation receiving unit 113, a power supply unit 114, an image processing unit 115, a storage unit 116, a control unit 117, a lamp driving unit 119, a receiving unit 150, and a display unit. 160, a projection mode change unit 170, and a mode change confirmation unit 180. The projector 100 of this example is remotely operated by an operation signal from the remote controller 200, and projects a projection image generated based on image data stored in an external input or inside onto a projection surface such as a screen. it can.

  Moreover, the projector 100 of this example can select a projection mode according to a plurality of installation states. More specifically, the projector 100 of this example is used by being fixed to the ceiling using a normal mode that is a projection mode selected when the projector 100 is placed on a desk or the like and a dedicated hanging bracket. It is possible to select a ceiling mode that is a projection mode that is selected in the case of Here, when the projector 100 is suspended from the ceiling and used on the desk or the like, the main body of the device is turned upside down, so either the normal mode or the ceiling mode is used. Is selected, projection conditions corresponding to the corresponding installation state are set as will be described later.

  In the projector 100 of this example, a projection mode that can be selected for use on a desk or the like (normal placement) and for use by hanging from a ceiling (ceiling) can be selected. When installed on the wall of a room (horizontal), installed behind the projection surface to project back onto a transparent or translucent surface such as glass (rear), or the ceiling of the room When the projector is installed such that the projection light is emitted upward for projection (upward installation), a projection mode according to another installation state may be selectable.

  The lamp 110 is, for example, a discharge lamp capable of obtaining high brightness such as a high-pressure mercury lamp, a metal halide lamp, or a halogen lamp. The optical unit 111 separates the white light emitted from the lamp 110 into substantially parallel light having a stable luminance distribution, and separates the white light having a stable luminance distribution into red, green, and blue light components, and outputs each color. A separation optical system that supplies the liquid crystal light valve for light, and a synthesis optical system (not shown) that combines again each color light modulated according to the image signal for each color light by the liquid crystal light valve. Including.

  The optical unit 111 generates projection light obtained by enlarging the full-color, substantially parallel modulated light emitted from the combining optical system with a built-in projection lens. Thereby, the projector 100 can project a full-color image on the projection surface.

  The liquid crystal panel driving unit 112 supplies a driving voltage and the like together with an image signal input from the image processing unit 115 to a liquid crystal light valve (not shown) of the optical unit 111, and projects a projected image on the liquid crystal light valve.

  The power supply unit 114 supplies power from the external power supply 300 to each unit of the projector 100 based on a signal from the control unit 117. More specifically, the power supply unit 114 transforms a DC voltage that has been transformed by an AC / DC conversion unit (not shown) incorporating AC power from the external power supply 300 and further stabilized by rectification and smoothing into a projector. It supplies to each part of 100.

  The lamp driving unit 119 generates an igniter circuit (not shown) that generates a high voltage to turn on the lamp 110 and forms a discharge path, and a ballast circuit (not shown) for maintaining a stable lighting state after lighting. )). Hereinafter, when the lamp 110, the optical unit 111, the liquid crystal panel driving unit 112, and the lamp driving unit 119 are collectively shown, they are referred to as a “projecting unit 120”.

  The receiving unit 150 is, for example, a wireless LAN card, an RFID tag, or a communication standard such as IrDA and Bluetooth (registered trademark) corresponding to at least one of the wireless LAN standards of IEEE 802.11a, IEEE 802.11b, or IEEE 802.11g. It is a corresponding receiving device and receives an operation signal transmitted from the remote controller 200. The receiving unit 150 includes an external interface such as a USB terminal or a DV terminal, and receives image data input from the outside.

  The storage unit 116 stores various programs and accompanying data for controlling the operation of the projector 100, such as a startup routine for starting the projector 100. Further, the storage unit 116 may store image data supplied from the outside via the receiving unit 150 during the projection operation, for example, in units of frames. The storage unit 116 also stores the setting of the projection mode change flag. The projection mode change flag indicates whether or not the projection mode has been changed. For example, when the projection mode is changed by the projection mode changing unit 170 as described later, the setting is changed. The storage unit 116 also stores image data of a mode change confirmation image that is projected in response to the change of the projection mode. The storage unit 116 includes a storage device that can hold stored information even when the power is off. For example, the storage unit 116 is a non-volatile memory, a memory having a backup power source, a hard disk, or the like.

  The image processing unit 115 generates an image signal to be projected on the projection surface of the screen based on externally input image data supplied via the receiving unit 150. More specifically, for example, the image processing unit 115 reads out the image data input via the reception unit 150 and stored in the storage unit 116 in units of frames, sequentially converts them into image signals, and outputs them to the projection unit 120. Output.

  The operation receiving unit 113 sends a signal that triggers various operations to the control unit 117 based on the operation content indicated by the operation signal received by the receiving unit 150. In addition, the operation receiving unit 113 sends a signal corresponding to the operation content to the control unit 117 based on the operation content input through an operation panel (not shown) provided on the outer surface of the main body of the projector 100. The control unit 117 controls each unit via the bus line Bus using a signal from the operation reception unit 113 as a trigger.

  The display unit 160 has, for example, LEDs that are lit in a plurality of colors, and notifies the user of the current state of the projector 100 by the lighting color and lighting state (continuous lighting or blinking) of the LEDs. For example, if the receiving unit 150 has a plurality of input terminals for image data and a specific input terminal is selected as the source terminal for the projection image, if the image data is input to the source terminal, An LED (input status LED) indicating an input state of image data to the source terminal in the display unit 160 is lit in green. On the other hand, if no image data is input to the source terminal, the input status LED is lit red. Further, when the input of image data to the source terminal is interrupted, the input status LED blinks red.

  The display unit 160 is not limited to the form having LEDs as described above, and may be, for example, a small LCD (liquid crystal display unit). Further, the content displayed by the display unit 160 is not limited to the state of the projector 100.

  Projection mode changing section 170 is a case where the operation content indicated by the operation signal received by receiving section 150 or the operation content input through the operation panel (not shown) of projector 100 main body indicates a change operation of projection mode. The currently selected projection mode is changed to the selected projection mode. When the projection mode changing operation is input, the projection mode changing unit 170 not only changes the projection mode, but also changes the projection mode change flag stored in the storage unit 116 so that the projection mode is changed. Change to the setting shown.

  More specifically, when the user presses the menu button 212 of the remote controller 200 or the menu button of the operation panel (not shown) of the main body while the projector 100 is activated, a menu screen as shown in FIG. 3 is projected. . When the user selects “change projection mode” from among a plurality of menu items displayed in the menu screen, for example, a projection mode change screen is projected as shown in FIG.

  Here, if the currently selected projection mode is the normal placement mode, the user selects “Ceiling suspension” from the “Orientation” and “Ceiling suspension” menu items displayed in the projection mode change screen. For example, as shown in FIG. 5, a message indicating that the projection mode has been changed from the normal mode to the ceiling mode is displayed, and the projection mode change flag stored in the storage unit 116 by the projection mode change unit 170 is displayed. Is changed to a setting indicating that the projection mode has been changed.

  Even when the projection mode is changed by the projection mode changing unit 170, the projection unit 120 projects an image in the projection mode before the change until the user further performs a predetermined operation. In other words, in this example, as shown in the message content illustrated in FIG. 5 ("reflected from the next start-up"), for example, even after the change operation from the normal position mode to the ceiling mode is performed. Until the power of 100 is turned off, the projection unit 120 projects an image in the normal mode. Then, after the power is turned off, the projector 120 starts projecting an image in the ceiling mode when it is activated next time. At this time, as described later, the projection unit 120 should project the mode change confirmation image and cancel the change of the projection mode to the user before starting the projection operation in the ceiling mode. After confirming the above, only when the user approves the change of the projection mode, the projection unit 120 projects an image in the changed projection mode.

  The mode change confirmation unit 180 causes the projection unit 120 to project a mode change confirmation image for confirming whether or not to cancel the change of the projection mode in response to the change of the projection mode. In this example, the mode change confirmation unit 180 confirms the mode change when a predetermined operation is performed in a state where the projection mode change flag is changed to a setting indicating that the projection mode has been changed by the projection mode change unit 170. The image is projected on the projection unit 120.

  More specifically, the mode change confirmation unit 180 accesses the storage unit 116 when the activation operation is performed, reads the setting of the projection mode change flag, and the read setting is the projection mode when the activation is performed last time. In the case of indicating that the projector has been changed, it is detected that the projection mode changing operation has been performed when the projector 100 was used last time. The mode change confirmation unit 180 reads out the image data of the mode change confirmation image from the storage unit 116 and causes the projection unit 120 to project the image data. If the setting of the projection mode change flag indicates that the projection mode has not been changed at the previous activation, the mode change confirmation image is not projected and the selected projection mode remains unchanged. The projection operation is started.

  An example of the mode change confirmation image is shown in FIG. As shown in FIG. 6, the mode change confirmation image includes a confirmation message for confirming whether or not to cancel the change of the projection mode. Further, the confirmation message includes an operation content for canceling the change of the projection mode (in the example shown in FIG. 6, “please press the [Esc] key to return to the normal mode” corresponds to this). .

  Further, the confirmation message in the mode change confirmation image is in a direction corresponding to each projection mode of the normal placement mode and the ceiling suspension mode in which the top and bottom of the projection image are opposite to each other, that is, the projector 100 is installed in any installation state. Even in such a case, the confirmation message is displayed in a direction in which the user can easily read (in this example, confirmation messages rotated 180 degrees relative to each other are arranged vertically). Note that, when the projector 100 can be installed in an installation state other than the normal placement and the ceiling suspension, it is preferable that a confirmation message is displayed on the mode change confirmation image in a direction corresponding to all the installation states.

  The mode change confirmation unit 180 is selected by the change operation instead of the mode change confirmation image when no operation is performed for a predetermined time after the projection of the mode change confirmation image on the projection unit 120. A projection image corresponding to the selected projection mode is projected. More specifically, the mode change confirmation unit 180 includes a timer, and projects a mode change confirmation image shown in FIG. 6 on the projection unit 120 in response to the change of the projection mode from the normal mode to the ceiling mode. If it is, the time from when the mode change confirmation image is projected until some operation is performed is counted.

  Then, when the time that has been counted without performing any operation reaches a preset time, the mode change confirmation unit 180 assumes that the change to the ceiling mode has been approved by the user and starts from the normal mode. The projection image rotated 180 degrees is projected on the projection unit 120. On the other hand, the mode change confirmation unit 180 cancels the projection mode change before the counting time reaches a preset time (in this example, the escape button 213 of the remote controller 200 or the operation panel of the main body). When the escape button is pressed), it is assumed that the change to the ceiling mode has been canceled by the user, and the projection image is projected in the original orientation (in the normal mode).

  It should be noted that the mode change confirmation unit 180 assumes that the user has approved the change to the suspension mode when an operation other than the cancel operation is performed before the counting time reaches a preset time. Alternatively, a projection image rotated 180 degrees from the normal placement mode may be projected.

  As described above, the mode change confirming unit 180 projects the projected images that are rotated by 180 degrees when projected in the normal mode between when the change to the ceiling mode is approved and when the change is canceled. To project. More specifically, when the change to the ceiling mode is canceled by the user, the mode change confirmation unit 180 causes the projection unit 120 to project a projection image in the direction of FIG. On the other hand, when the change to the ceiling mode is approved by the user, the mode change confirmation unit 180 projects the projection image in a direction rotated 180 degrees from the direction in FIG. 7A (FIG. 7B). 120 is projected. When the projector 100 is suspended from the ceiling, the top surface and the bottom surface of the main body are reversed, that is, installed upside down. Therefore, the orientation of the image projected by the projection unit 120 is substantially the same in the normal mode and the ceiling mode.

  Further, in the projector 100 of this example, when the projection mode is changed, a mode change confirmation image for confirming whether or not to cancel the change of the projection mode is projected at the next startup, so the projection mode is changed. It is possible for the user to recognize with certainty and determine whether to approve or cancel the change. Therefore, for example, when one user changes the projection mode of the projector 100 from the floor-standing mode to the ceiling-suspended mode, when another user starts using the projector 100 in the normal position, The user can cancel the projection mode change made by the previous user.

  In addition, by projecting the mode change confirmation image in association with the activation operation, for example, the user who performed the activation operation or subsequent projection condition setting operation in a projection mode that is not appropriate for the installation state changes the projection mode. It is possible to determine whether the change has been approved or canceled by recognizing that the change has been made. Further, in the projector 100 of this example, since the setting of the projection mode change flag is stored in the storage unit 116 capable of holding the stored information even when the power is off, the power supply after the projection mode is changed is stored. Even if is turned off, the information in which the projection mode is changed is retained. Therefore, the user can surely recognize that the projection mode is changed at the next startup.

  In addition, when no operation is performed for a predetermined time after the mode change confirmation image is projected, the projection operation is started in the changed projection mode without performing the operation. No operation is required to approve.

  FIG. 8 shows an example of an operation flow of the projector 100 when the projection mode changing operation is performed. In this operation flow, first, when the user performs an operation for changing the projection mode through the remote controller 200 or the operation panel (not shown) of the projector 100 (step S51), the projection mode changing unit 170 changes the projection mode of the projector 100. Then, the projection mode change flag stored in the storage unit 116 is changed to a setting indicating that the projection mode has been changed (step S55).

  Then, the projection mode changing unit 170 changes the projection mode of the projector 100, and displays a message indicating a condition (in this example, restarting after the projector 100 is turned off) that the change is reflected in the projection image by the projection unit 120. The included image is projected on the projection unit 120 (step S57). Thereby, this flow ends.

  FIG. 9 shows an example of the operation flow of the projection operation by the projector 100. In this operation flow, first, when the user performs a startup operation of the projector 100 by pressing the power button 211 of the remote controller 200 or the power button of the projector 100 (step S110), the mode change confirmation unit 180 stores the storage unit 116. To read the setting of the projection mode change flag (step S112).

  When the read setting indicates that the projection mode has been changed at the previous activation (step S115: YES), the mode change confirmation unit 180 causes the projection unit 120 to project the mode change confirmation image. (Step S120). Then, the time after the start of the projection of the mode change confirmation image is counted by the mode change confirmation unit 180 (step S125). When the setting of the projection mode change flag indicates that the projection mode has not been changed (step S115: NO), the projection image is projected in the selected projection mode (step S160). .

  On the other hand, when the user performs an operation before the time counted in step S125 reaches a preset time, the operation is an operation (cancellation operation) for canceling the change of the projection mode. In (Step S130: YES), after the projection mode is returned from the currently selected mode to the mode before the change (Step S165), the projection of the mode change confirmation image is stopped (Step S145). Then, the time counted by the mode change confirmation unit 180 is reset (step S150), and further, the mode change confirmation unit 180 sets the projection mode change flag indicating that the projection mode change operation is not performed. (Step S155). Then, the projection image is projected in the projection mode before the change (step S160).

  On the other hand, when an operation other than the cancel operation is performed before the counted time reaches a preset time (step S130: NO) (step S135: YES), the projection mode performed at the previous activation is changed. Assuming that the change has been approved by the user, the projection of the mode change confirmation image is stopped (step S145). Then, the time counted by the mode change confirmation unit 180 is reset (step S150), and further, the mode change confirmation unit 180 sets the projection mode change flag indicating that the projection mode change operation is not performed. (Step S155). In this case, the projection image is projected in the selected projection mode (the projection mode changed at the previous activation) (step S160).

  Also, when the time counted by the mode change confirmation unit 180 reaches a preset time without performing any operation (step S140: YES), the projection mode change performed at the previous activation is also performed. Are approved by the user, the above steps S145 to S160 are executed, and the projection image is projected in the projection mode changed at the previous activation. Thus, the operation flow ends.

  In this operation flow, an example is shown in which the operation from when the projection mode change operation is detected from the setting of the projection mode change flag to when the mode change confirmation image is projected is performed when the projector 100 is activated. These timings are not limited to when the projector 100 is activated. For example, it may be performed in response to a predetermined operation by the user during the projection operation of the projector 100.

(Modification)
In the above-described embodiment, the liquid crystal three-plate projector that modulates and projects the light from the light source by the liquid crystal light valve that is the light modulation unit has been exemplified. . Specifically, there is a so-called DLP (Digital Light Processing) (registered trademark) system using a projection system using DMD (Digital Micromirror Device). That is, in the DLP method, light from a lamp that shines white is condensed by a lens and applied to the DMD, and when each mirror of the DMD is tilted to an on state, the light is enlarged by another lens and projected onto the screen. Therefore, the present invention can also be applied to such a projector.

  In the above-described embodiment, the projector 100 that projects using a discharge lamp as a light source is exemplified. However, the present invention can also be applied to a projector that projects using an LED light source or a laser light source as a light source.

DESCRIPTION OF SYMBOLS 100 ... Projector, 110 ... Lamp, 111 ... Optical part, 112 ... Liquid crystal panel drive part, 113 ... Operation reception part, 114 ... Power supply part, 115 ... Image processing part, 116 ... Memory | storage part, 117 ... Control part, 119 ... Lamp Drive unit, 120 ... projection unit, 150 ... reception unit, 160 ... display unit, 170 ... projection mode change unit, 180 ... mode change confirmation unit, 200 ... remote controller, 211 ... power button, 212 ... menu button, 213 ... escape Button 214 Scroll button 215 Character / number input button 216 Mute button 217 Enter button 220 Display 300 External power supply

Claims (7)

A projector capable of selecting a projection mode according to a plurality of installation states,
A projection unit that projects a projection image according to the currently selected projection mode based on the input image data;
A projection mode changing unit for changing the projection mode;
A mode change confirmation unit that projects a mode change confirmation image on the projection unit to confirm whether or not to cancel the change of the projection mode in response to the change of the projection mode,
A projector comprising: The projection mode changing unit changes a projection mode change flag indicating whether or not the projection mode has been changed to a setting indicating that the projection mode has been changed in response to the change of the projection mode,
The mode change confirming unit sends the mode change confirmation image to the projection unit when a predetermined operation is performed in a state where the projection mode change flag is changed to a setting indicating that the projection mode has been changed. The projector according to claim 1, wherein the projector is projected. A storage unit for storing the setting of the projection mode change flag;
In response to the mode change confirmation unit being read from the storage unit when the activation operation is performed, the projection mode change flag is a setting indicating that the projection mode has been changed. The projector according to claim 2, wherein the mode change confirmation image is projected on the projection unit.   The said mode change confirmation part makes the said projection part project the said mode change confirmation image containing the confirmation message projected in the direction according to each of the said some projection mode, Any one of Claim 1 to 3 characterized by the above-mentioned. The projector according to claim 1.   The said mode change confirmation part makes the said projection part project the said mode change confirmation image containing the operation content for canceling the change of the said projection mode, The any one of Claim 1 to 4 characterized by the above-mentioned. Projector.   The mode change confirmation unit stops the projection of the mode change confirmation image when the operation has not been performed for a predetermined time after the mode change confirmation image is projected on the projection unit, and the changed projection. The projector according to any one of claims 1 to 5, wherein a projection image corresponding to a mode is projected. A projector control method in which a plurality of projection modes can be selected,
A projection stage for projecting a projection image according to the currently selected projection mode based on input image data;
A projection mode changing step for changing the projection mode;
A mode change confirmation step for projecting a mode change confirmation image on the projection unit for confirming whether or not to cancel the change of the projection mode in response to the change of the projection mode,
A projector control method comprising:

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