JP2019075661A - Projection apparatus and control method thereof - Google Patents

Abstract

To reduce the possibility that a user is not easily see the surroundings while reducing glare of the user in a projection apparatus that can also use illumination and change the projection direction of an image.SOLUTION: A projection apparatus includes a light source, modulation means that modulates a light from the light source on the basis of an image signal, projection means that projects either the light from the light source or the light modulated by the modulation means to the outside, acceptance means that accepts an instruction to change the projection direction by the projection means, and control means that performs control to reduce the light projected by the projection means when the instruction to change the projection direction is accepted by the acceptance means in a case in which either the light from the light source or the light modulated by the modulation means is projected by the projection means.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a projection device.

  The projection apparatus is an apparatus that modulates the light of the light source based on the image signal and projects the light on a projection surface such as a screen to display an image by the reflected light. Furthermore, there is a technology that uses a projection device as illumination. For example, in Patent Document 1, a first optical system that generates light having a first illuminance distribution for an image, and a second optical that projects illumination light having a second illuminance distribution for illumination from a projection unit The art of a projection device having a system is disclosed.

  On the other hand, in the projection apparatus, there is a demand for freely changing the projection direction largely. On the other hand, in Patent Document 2, the technology of a projection apparatus having a power supply housing and a projection unit that projects an image, and having a projection main body supported by the power supply housing so as to adjust the projection direction of the image It is disclosed.

  FIG. 10A shows how the projection apparatus freely changes the projection direction while projecting the image. Reference numerals 1000a and 1000b denote the same projectors, respectively, and indicate that they are facing in different directions. The projector 1000 is configured to be rotatable, and the projection screen 1001 a is projected and displayed when facing the direction indicated by the symbol a, and the projection screen 1001 b is projected when facing the direction indicated by the symbol b. indicate. On the other hand, it is assumed that the user 1002 is present in the nearby space.

  Here, it is assumed that the projection direction of the projector 1000 is being changed. FIG. 10B is a diagram showing a state of projection of the projector 1000 c at the moment when it is turned in the direction c while it is changed from the direction a to the direction b. At this time, although the projector 1000c projects and displays the projection screen 1001c, the projection light of the image just irradiates the user 1002, and the user 1002 may feel uncomfortable glare. For this reason, the projector may temporarily stop projecting the light of the light source during the change of the projection direction.

JP, 2016-184067, A JP, 2015-22147, A

  However, when using a projection device that also has an illumination function, if the light from the light source is not projected during the change of the projection direction, there is a possibility that there is no other illumination in the room, and while moving it is in the room May be a dark state or a dark environment close to it. During that time, the user sees the surroundings difficult and dangerous.

  Therefore, the present invention is directed to a projection apparatus capable of changing the projection direction of an image by using illumination as well and reducing the user's difficulty in visually recognizing the surroundings while reducing the glare of the user. Do.

  In order to achieve such an object, the projector according to the present invention comprises a light source, a modulation unit that modulates light from the light source based on an image signal, light from the light source, or light modulated by the modulation unit. And projecting the light from the light source by the projection means or the light modulated by the modulation means. It is characterized by having a control means which controls to perform processing which dims the light currently projected by the projection means, when the instruction | indication which changes a projection direction is received by the reception means while doing.

  According to the present invention, in the projection apparatus which also serves as illumination, it is possible to reduce the difficulty in visually recognizing the surroundings while reducing the glare of the user while changing the projection direction of the image. It is.

It is a perspective view for explaining a projector to which the present invention is applied. It is a block diagram for demonstrating the structure of the projector to which this invention is applied. It is a block diagram for demonstrating the structure of the projection part of the projector to which this invention is applied. It is a flowchart for demonstrating the operation | movement flow of the projector to which this invention is applied. It is a figure for demonstrating the menu image which the projector to which this invention is applied displays. It is a figure for demonstrating the behavior of the projector to which this invention is applied. It is a flowchart for demonstrating the operation | movement flow of the projector to which this invention is applied. It is a figure for demonstrating the captured image of the projector to which this invention is applied. It is a flowchart for demonstrating the operation | movement flow of the projector to which this invention is applied. It is a figure for demonstrating the behavior of the conventional projector.

  Hereinafter, although the example of the present invention is described in detail with reference to the drawings, the present invention is not limited to the following embodiments.

First Embodiment
In the present embodiment, a projection apparatus to which the present invention is applied will be described.

<Overall configuration>
First, the entire configuration of this embodiment will be described using FIG. FIG. 1A is a perspective view showing a configuration in which an image is projected and displayed on a wall of a room by a projector.

  Reference numerals 100a and 100b denote the same projectors, respectively, and indicate that they are facing in different directions. Hereinafter, when a code such as a or b is added to 100, it indicates that the projector is at the position indicated by the code. In the case where the reference numerals a and b are not added to 100, it is indicated that the description does not relate to the position. The projector 100 is connected to a ceiling of a room and installed, and is rotatably configured (details will be described later). The projector 100 optically projects an image signal input from a signal source (not shown) and causes the wall of a room to be displayed as projection images 101 a and 101 b. In the case of the projector 100a, the projection image 101a is projected and displayed on the left wall toward the paper surface, and in the case of the projector 100b, the projection image 101b is projected and displayed on the right wall toward the paper surface. In addition, a user 102 exists in the room. The user 102 holds the operation terminal 103 as a remote controller, and can operate the projector 100 via the operation terminal 103, such as a rotation instruction for changing the projection direction.

  FIG. 1B is a perspective view of the projector 100. FIG. The projector 100 includes a connection unit 104 for connecting to the ceiling of a room, and a main unit 105 that projects an image. Here, the front direction of the projector 100 is parallel to the ceiling or floor, the X axis is in the front direction of the projector 100, the Y axis (horizontal direction on the paper surface) in the direction perpendicular to the X axis, and Z in the vertical direction in the room. The axis (vertical direction of the paper). Although details will be described later, the connection portion 104 and the main body portion 105 are rotatably connected, and the main body portion 105 is rotatable around the Y axis and around the Z axis. Here, the rotation around the Y axis is called tilt, and the rotation around the Z axis is called pan. Thus, since rotation of two axes is possible, it is possible to face and project to various places in the room other than the illustrated projected images 101a and 101b. In addition, the projector 100 includes a projection unit 205 for projecting light and a camera 208 for capturing an image in the same direction (details will be described later).

<Detailed Configuration of Projector>
Next, the block configuration inside the projector 100 will be described using FIG.

  The main unit 105 of the projector 100 is configured as follows.

  200 is a control unit. The control unit 200 is configured of a microcomputer and controls the entire projector 100. The operation of the control unit 200 will be described later.

  201 is a bus. The control unit 200 can communicate with each unit in the projector 100 via the bus 201.

  Reference numeral 202 denotes a video input unit. The image input unit 202 receives an image signal from a signal source (not shown), converts the image data into a format that can be processed by the circuit in the subsequent stage, and outputs the image data to the image processing unit 203.

  Reference numeral 203 denotes an image processing unit. The image processing unit 203 performs image processing on the image data received from the video input unit 202 in accordance with an instruction from the control unit 200. The image processing unit 203 performs, as image processing, tone conversion processing such as gain and offset, gamma correction, frame thinning processing, frame interpolation processing, resolution conversion processing, image synthesis processing, geometry correction processing (keystone correction processing, curved surface correction) , Panel correction, etc. can be performed. In particular, the image processing unit 203 can superimpose the image instructed from the control unit 200 on the output image as the image combining process. Thus, for example, it is possible to superimpose a menu image for causing the user to perform setting on the projector 100 in the projection image. Furthermore, the image processing unit 203 can also output an image in accordance with an instruction from the control unit 200. The image processing unit 203 outputs the processed image data to the panel drive unit 204 described later.

  Reference numeral 204 denotes a panel drive unit. The panel drive unit 204 converts the input image data into a drive signal for forming an image on a liquid crystal panel 223 described later, and outputs the drive signal to the liquid crystal panel 223.

  Reference numeral 205 denotes a projection unit. The projection unit 205 includes a light source 221 described later, a liquid crystal panel 223, and the like. The light from the light source 221 is modulated by the liquid crystal panel 223 by the projection unit 205, projected to the outside of the projector 100 in the right direction in the drawing, and projected and displayed as an image.

  206 is a ROM. The ROM 206 is a non-volatile memory, and stores program codes and data for the control unit 200 to operate. The ROM 206 also stores data necessary for the projector 100 to operate.

  207 is a RAM. The RAM 207 is a volatile memory, and is used as a work memory for the control unit 200 to operate.

  208 is a camera. The camera 208 can obtain a projection image and a pickup image around the projection image by imaging the projection display direction of the projector 100. The camera 208 takes an image by receiving an instruction from the control unit 200, and transmits the obtained captured image data to the control unit 200.

  Reference numeral 209 denotes a communication unit. The communication unit 209 includes a wired communication module via a cable (not shown) and a wireless communication module. The communication unit 209 can perform communication for transmitting and receiving data to and from an external device. Thus, it is possible to receive an input image from an external device or to receive an instruction for the projector 100. In particular, by receiving a signal corresponding to the operation from the operation terminal 103 described later, the user can receive an operation instruction.

  Reference numeral 210 denotes an actuator for rotating the main body unit 105 with respect to the connection unit 104 fixed to the ceiling. The actuator 210 performs operations of tilt rotation around the Y axis (axis perpendicular to the paper surface) and pan rotation around the Z axis (vertical axis in the paper surface) according to an instruction from the control unit 200 via the bus 201. It is possible.

  Next, the operation terminal 103 for operating the projector 100 will be described with reference to FIG. The operation terminal 103 is configured separately from the projector 100, receives an operation instruction from the user, and transmits the operation instruction to the projector 100 by wireless communication via the terminal communication unit 211.

  Even if the operation terminal 103 has the power button 212, the menu button 213, the upper button 214, the lower button 215, the left button 216, the right button 217, and the determination button 218 for inputting an operation instruction from the user. Good.

  Further, the operation terminal 103 may be provided with the display unit 219 to present the menu image to the user. Furthermore, the display unit 219 may be configured to include, for example, a capacitive touch sensor, and may receive an operation instruction by a user's touch operation.

  Subsequently, the detailed configuration of the projection unit 205 will be described with reference to FIG.

  Reference numeral 220 denotes a light source control unit. The light source control unit 220 controls on / off of a light source 221 to be described later and controls the light amount according to an instruction of the control unit 200 received via the bus 201.

  221 is a light source. The light source 221 emits light for projection or illumination of an image. As the light source 221, a high pressure mercury lamp, a halogen lamp, or a laser light source can be used.

  Reference numeral 222 denotes an illumination optical system. The illumination optical system 222 includes a plurality of lenses, and is for homogenizing and collimating the light from the light source 221 to illuminate a liquid crystal panel 223 described later.

  223 is a liquid crystal panel. An image is formed on the liquid crystal panel 223 by the drive signal generated by the panel drive unit 204. As the liquid crystal panel 223, a transmissive liquid crystal panel or a reflective liquid crystal panel can be used.

  Reference numeral 224 denotes an optical system control unit. The optical system control unit 224 controls enlargement, reduction, focus adjustment, lens shift, and the like of a projection image of the projection optical system 225 described later according to an instruction of the control unit 200 received via the bus 201. In addition, a fisheye lens for super-widening the projection light from the projection optical system 225 may be controlled to be inserted into the optical path.

  225 is a projection optical system. The projection optical system 225 is for projecting the light modulated by the liquid crystal panel 223 to the outside. The projection optical system 225 includes a plurality of lenses and an actuator for driving the lens, and the lens can be driven by the actuator to perform enlargement, reduction, focus adjustment, lens shift and the like of the projection image. In addition, it may be configured to have a fisheye lens for super-widening the projection light, and an actuator for moving the fisheye lens in and out of the optical path.

  226 is a diffusion control unit. The diffusion control unit 226 controls the diffusion degree of the diffusion unit 227 described later according to an instruction of the control unit 200 received via the bus 201.

  227 is a diffusion part. The diffusion unit 227 is for diffusing or transmitting the light output from the projection optical system 225. For example, a polymer dispersed liquid crystal capable of controlling the diffusion and the transmission according to the applied voltage is used. Can. Further, it may be configured to have a diffusion plate for diffusing the projection light, and an actuator for moving the diffusion plate in and out of the optical path. In this case, when the diffusion plate is disposed in the optical path, the projection light is diffused and irradiated to the outside, and when the diffusion plate is disposed outside the optical path, the projection light is projected to the outside as it is.

<Basic Operation Flow of Projector>
Next, the basic operation flow of the projector 100 will be described.

  When AC power is supplied to the projector 100 with a power cable (not shown), the power is supplied to the control unit 200, the ROM 206, the RAM 207, and the communication unit 209, and the control unit 200 is activated and enters a standby state. Here, when the control unit 200 detects that the user has issued a start instruction, the control unit 200 performs start processing of each unit of the projector 100. Specifically, control is performed to supply power to each part, and the video input unit 202, image processing unit 203, panel drive unit 204, actuator 210, light source control unit 220, optical system control unit 224, diffusion control unit 226 Configure to be operational. Next, the control unit 200 causes the light source 221 to emit light and operates a cooling fan (not shown). Thereby, the projector 100 starts projection display of the image input from the video input unit 202. Further, at the time of initial setting of the image processing unit 203, the control unit 200 gives the image processing unit 203 an initial value of the image quality adjustment value. Further, at the time of initial setting of the diffusion control unit 226, the control unit 200 instructs the diffusion unit 227 to be in the transmission state. As an example of the activation instruction, pressing of the power switch (not shown) of the main unit 105, pressing of the power button 212 of the operation terminal 103 detected via the communication unit 209, touch operation of the display unit 219, or via the communication unit 209 It is possible to use the control command or the like of another control device that has been received.

  Here, hereinafter, a state in which the diffusion unit 227 is in the transmission state and an image is displayed by projection is referred to as a projection mode. Further, a state in which the diffusion unit 227 is in the diffusion state and light diffused from the projection unit 205 is output is referred to as an illumination mode.

  During startup, when the control unit 200 receives an image quality adjustment instruction such as gain adjustment, offset adjustment, or gamma adjustment from the user, the control unit 200 instructs the image processing unit 203 to perform corresponding image processing.

  During startup, when the control unit 200 receives a light source adjustment instruction such as brightness adjustment from the user, the control unit 200 instructs the light source control unit 220 to perform corresponding processing.

  During startup, when the control unit 200 receives a projection adjustment instruction such as zoom ratio adjustment and focus adjustment from the user, the control unit 200 instructs the projection optical system 225 to perform a corresponding process.

  When the control unit 200 receives an instruction to switch to the illumination mode from the user during startup, the control unit 200 instructs the diffusion control unit 226 to diffuse the projection light. Further, the control unit 200 instructs the image processing unit 203 to output a white raster image. As a result, the projector 100 is in a state (illumination mode) in which white light is diffused and output from the projection unit 205. Note that by providing a movable mirror on the light path of the projection unit 205, the light from the light source 221 is selectively made to be incident on the liquid crystal panel 223 or guided by a mirror to another optical system to project unmodulated light. You may do so. In this way, unmodulated light may be projected even when white raster display is not performed in the illumination mode.

  When the control unit 200 receives an instruction to switch to the projection mode from the user during startup, the control unit 200 instructs the diffusion control unit 226 to transmit the projection light to the diffusion unit 227. Furthermore, the control unit 200 issues an instruction to process the image input from the video input unit 202 and output it. As a result, the projector 100 is in a state (projection mode) in which an image is projected and displayed by the projection unit 205.

  In addition, as various instructions from the user shown above, a switch (not shown) of the main body unit 105 is pressed, an operation instruction of the operation terminal 103 received via the communication unit 209, and other control devices received via the communication unit 209 Control commands can be used.

  When the control unit 200 detects that the user has issued a termination instruction during startup, the control unit 200 performs termination processing of each unit of the projector 100. Specifically, the control unit 200 instructs the light source 221 to stop light emission, shuts down the power supply of each part of the projector 100, and the power is supplied to only the control unit 200, the ROM 206, the RAM 207, and the communication unit 209. Do. As a result, the control unit 200 returns to the standby state. As an example of the end instruction, pressing of the power switch (not shown) of the main body unit 105, pressing of the power button 212 of the operation terminal 103 detected via the communication unit 209, touch operation of the display unit 219, or via the communication unit 209 The control command or the like of another accepted control device can be used.

<Characteristic operation flow of the projector>
Next, a characteristic operation flow of the projector 100 will be described with reference to FIG.

  During startup, the control unit 200 starts the flow of FIG. 4 when receiving an operation instruction from the user.

  At S100, control unit 200 determines whether to change the projection direction based on the received operation instruction. This determination may be made based on the correspondence between the menu image superimposed by the image processing unit 203 and the user's operation instruction.

  For example, when the menu button 213 of the operation terminal 103 is pressed in a state where the menu image is not superimposed and displayed, the control unit 200 determines that it is a menu display instruction. That is, it is determined that the projection direction is not changed.

  For example, when the menu button 213 of the operation terminal 103 is pressed while the menu image is superimposed and displayed, the control unit 200 determines that the menu deletion instruction is issued. That is, it is determined that the projection direction is not changed.

  For example, when the upper button 214 or the lower button 215 of the operation terminal 103 is pressed while the menu image is superimposed and displayed, the control unit 200 determines that it is a cursor movement instruction. That is, it is determined that the projection direction is not changed.

  Here, FIG. 5A will be described as an example of the menu image. 500a is an example of a menu image. A plurality of setting items exist in the menu image 500a, and one of the setting items can be selected by the cursor 501a. In this example, there are two setting items, a setting item 502a for performing pan adjustment, and a setting item 503b for performing tilt adjustment.

  For example, when the cursor 501a is present at the position of the setting item 502a in a state where the menu image 500a is superimposed and displayed, and the left button 216 and the right button 217 of the operation terminal 103 are pressed, the control unit 200 determines them as a left pan instruction and a right pan instruction. That is, it is determined to change the projection direction.

  For example, when the cursor 501a is present at the position of the setting item 503a in a state where the menu image 500a is superimposed and displayed, and the left button 216 and the right button 217 of the operation terminal 103 are pressed, the control unit 200 determines them as an upper tilt instruction and a lower tilt instruction. That is, it is determined to change the projection direction.

  If such a determination is made and it is determined that the projection direction is to be changed, the process proceeds to step S103. If it is determined that the direction is not changed, the process proceeds to step S101.

  Note that the operation instruction of pressing the button as described above is merely an example, and another operation instruction may be received. For example, control commands such as pan and tilt movement amounts may be received directly from the operation terminal 103 or an external device (not shown) via the communication unit 209. Furthermore, in that case, the menu image shown in FIG. 5 may be displayed on the operation terminal 103 or an external device (not shown), and the display of the menu image may be omitted in the projector 100.

  At S101, control unit 200 determines whether the current operation mode is the illumination mode. If it is the illumination mode, this flow ends. If it is the projection mode, the process proceeds to step S102.

  In S102, based on the operation instruction determined in S100, the control unit 200 performs an instruction to superimpose a newly generated menu image, an instruction to superimpose a menu image whose cursor position has been changed, or an instruction to delete a menu image. This is done for 203. After this, this flow ends.

  On the other hand, at S103, control unit 200 determines whether the current operation mode is the illumination mode. If it is the illumination mode, the process proceeds to step S108. If it is the projection mode, the process proceeds to step S104.

  At S104, control unit 200 changes the operation mode to the low illumination mode. The low illuminance mode is a mode in which the light reduction processing is performed at the irradiation point of the projection light and the illuminance is lower than that in the projection mode.

  As a first example of the process of switching to the low illumination mode, the control unit 200 may instruct the light source to reduce the amount of light to be output. As a result, compared to the projection mode, the luminous flux of the projection light decreases, resulting in low illuminance.

  As a second example of the process of switching to the low illumination mode, the control unit 200 may instruct the image processing unit 203 to perform image processing to apply a gain less than 1.0 to the gradation value. As a result, the amount of light output from the liquid crystal panel 223 decreases, and the light flux of the projection light decreases as compared to the projection mode, and as a result, the light is reduced and the illuminance becomes low.

  As a third example of the process of switching to the low illuminance mode, the control unit 200 may instruct the diffusion control unit 226 to diffuse the projection light. As a result, the light output from the projection unit 205 is diffused in a wider range compared to the projection mode, and as a result, the light is reduced and the illuminance becomes low.

  As a fourth example of the process of switching to the low illuminance mode, the control unit 200 may instruct the optical system control unit 224 so that the zoom lens of the projection optical system 225 is at the wide end. As a result, the light output from the projection unit 205 is projected at a wider angle of view than the projection mode, which reduces the light intensity, resulting in low illuminance.

  As a fifth example of the process of switching to the low illuminance mode, the control unit 200 may instruct the optical system control unit 224 to cause the projection optical system 225 to defocus. Thereby, the light output from the projection unit 205 is diffused and projected more than in the projection mode, and as a result, the light is reduced and the illuminance is low.

  As a sixth example of the process of switching to the low illuminance mode, the control unit 200 may instruct the optical system control unit 224 to place the fisheye lens on the light path by the projection optical system 225. As a result, the light output from the projection unit 205 is projected at a wider angle of view than the projection mode, and as a result, the light is reduced and the illuminance becomes low.

  The present invention is not limited to the above examples. It may be a combination of two or more of the above examples. Also, the low illumination mode may be the same control as the illumination mode described above. Moreover, as long as the illuminance in the low illuminance mode is lower than the illuminance in the projection mode up to immediately before, any mode can be applied as the low illuminance mode.

  At S105, the control unit 200 instructs the actuator 210 to drive pan and tilt based on the operation instruction determined at S100.

  At S106, control unit 200 determines whether the operation instruction determined at S100 continues. For example, if the left button 216 or the right button 217 of the operation terminal 103 is continuously pressed from S100, it is determined that the operation instruction is continued. If the operation instruction is continued, the process returns to S105. If it does not continue, the process proceeds to S107.

  In step S107, the control unit 200 determines that the change of the projection direction is completed, and instructs the respective units in step S104 to end the instruction to return from the low illumination mode to the projection mode. After this, the flow ends.

  On the other hand, when it is determined in S103 that the current operation mode is the illumination mode, the flow from S108 is performed.

  S108 is a step which performs the process similar to S105.

  At S109, control unit 200 makes the same determination as at S106. If the operation instruction is continued, the process returns to S108. If not, the flow ends.

  In the flow of FIG. 4, all of the change periods of the projection direction reduce the light to be projected to be in a low illuminance state, but a part of the change periods (for example, the first few seconds of the change operation) In the state, when the change operation continues for a further period, the state of low illuminance may be set.

<Behavior when changing the projection direction of the projector>
A perspective view in the case where the user operates the menu image 500 etc. using the operation terminal 103 to change the projection direction of the projector 100 is shown in FIG.

  FIG. 6A shows the behavior of the low illumination mode in the first and second examples described in S104. This figure shows an example in which the projector 100 is instructed to change the projection direction in order to move the projection image during image display from 101a to 101b. In the change period of the projection direction, the projection image at the time when the orientation of the projector 100c is reached is 101c. At this time, since the projector 100 is in the projection mode at the start of movement, the determination in S103 is No, and the process in S104 is performed. That is, compared with the light in the projection mode, the amount of light flux projected is small, so that light with low illuminance is emitted. Therefore, although light from the projection unit 205 is emitted to the user, glare can be reduced, and it is possible to prevent the interior of the room from becoming dark or close to it.

  FIG. 6B is a view showing the behavior in the third to sixth examples of the low illuminance mode described in S104. This figure shows an example in which the projector 100 is instructed to change the projection direction in order to move the projection image during image display from 101a to 101b. During the change of the projection direction, the projection image at the time when the orientation of the projector 100d is reached is 101d. At this time, since the projector 100 is in the projection mode at the start of movement, the determination in S103 is No, and the process in S104 is performed. That is, since light which is diffused or made wider than that in the projection mode is projected, light with low illuminance is emitted. Therefore, although light from the projection unit 205 is emitted to the user, glare can be reduced, and it is possible to prevent the interior of the room from becoming dark or close to it.

<Other deformation>
In addition, although the example of a pan and a tilt was demonstrated above as a change form of a projection direction, this invention is not limited to it. The present invention can be applied to any modification as long as the projection screen moves. For example, roll rotation (rotation around the X axis in FIG. 1B) may be used. In that case, the actuator 210 may be configured to allow rotation about the X axis. Further, the projector 100 may be a modification in which the projector 100 slides in parallel with the ceiling. In such a case, the connection portion 104 may be connected to a member such as a wiring duct or a rail.

  In addition, although the method of reducing the brightness of projection light by reducing the output of a light source and the gradation of an image was demonstrated, another method is also applicable. For example, a light control member such as an iris or liquid crystal may be provided on any of the light paths in the projection unit 205 to reduce light.

Second Embodiment
The present invention is also applicable to the configuration obtained by modifying the first embodiment. The difference from the first embodiment will be described.

<Characteristic operation flow of the projector>
The characteristic flow of the control unit 200 described in the first embodiment is modified as shown in FIG. The following description will be made focusing on the deformation points while omitting the description of the common points.

  Since S200, S201, S202, S203, S204, and S205 correspond to S100, S101, S102, S103, S108, and S109, respectively, and the same processing is performed, the description will be omitted. However, in the case of S203, if the current operation mode is not the illumination mode, it is transformed to transition to S206.

  At S206, control unit 200 updates the menu image and instructs superimposition to image processing unit 203 as necessary. For example, the amount of change in pan or tilt may be displayed on the menu.

  At S207, control unit 200 prepares a counter variable in RAM 207 and sets 0.

  At S208, the control unit 200 instructs the actuator 210 to drive pan and tilt based on the operation instruction determined at S200.

  At S209, control unit 200 makes the same determination as at S106. If the operation instruction is continued, the process returns to S210. If not, the flow ends.

  At S210, control unit 200 adds 1 to the counter variable prepared in RAM 207.

  At S211, control unit 200 determines whether the value of the counter variable is equal to or less than predetermined value N. If it is N or less, the process proceeds to S208. If not, transition is made to S212.

  At S212, control unit 200 instructs camera 208 to perform imaging and obtains a captured image in the projection direction. An example of a captured image is shown in FIG. 800 is a captured image. The captured image 800 is obtained by capturing the inside of a room at a wider angle than the projection image 101. The control unit 200 detects whether a human face is included in an area based on the pan and tilt directions in the captured image 800. For example, in the case of panning in the left direction, it is detected in the captured image 800 whether or not the area 801 on the left side of the projection image 101 includes a human face. For example, in the case of panning in the right direction, it is detected in the captured image 800 whether a region 802 on the right side of the projection image 101 includes a human face. For example, in the case of tilting in the upward direction, it is detected whether or not a human face is included in the region 803 above the projection image 101 in the captured image 800. For example, in the case of tilting downward, it is detected in the captured image 800 whether the area 804 below the projected image 101 includes a human face. As a result, when a human face is not detected, the process proceeds to S204. If not, transition is made to S213.

  S213, S214, S215, and S216 correspond to S104, S105, S106, and S107, respectively, and the same processing is performed, so the description will be omitted.

  According to this example, as in the first embodiment, although the user is irradiated with the light from the projection unit 205, the glare can be reduced, and the interior of the room is made dark or nearly so. You can prevent that.

  Furthermore, the low illumination mode can be changed only when the human is in the change direction of the projection direction.

  Furthermore, according to the present embodiment, after continuing the pan and tilt for a while (after the counter value exceeds N), the behavior becomes an alternative to the low illumination mode. Therefore, when the pan or tilt is finely adjusted, the convenience of the fine adjustment is improved without the low illumination mode.

  In the above embodiment, the presence of a person is determined by analyzing the image obtained by the photographing means as a human sense means, but the presence of a person may be determined based on another human sense sensor such as an infrared sensor. Good.

Third Embodiment
The present invention is also applicable to a configuration obtained by modifying the second embodiment. The difference from the second embodiment will be described.

<Characteristic operation flow of the projector>
The characteristic flow of the control unit 200 described in the second embodiment is modified as shown in FIG. The following description will be made focusing on the deformation points while omitting the description of the common points.

  S200 is modified into S300. In the present embodiment, since the menu image to be displayed is different from that of the second embodiment, the difference due to the difference in the menu image will be described. The menu image displayed in the present embodiment is shown in FIG. 500 b is an example of a menu image. A plurality of setting items exist in the menu image 500b, and one of the setting items can be selected by the cursor 501b. In this example, a setting item 502b for roughly adjusting the pan, a setting item 503b for finely adjusting the pan, a setting item 504b for roughly adjusting the tilt, and a setting item for finely adjusting the tilt There are four setting items 505b.

  As described above, when there is a menu display instruction, a menu erase instruction, or a cursor movement instruction based on pressing of the menu button 213, the upper button 214, or the lower button 215, it is determined that the projection direction is not changed.

  On the other hand, for example, when the cursor 501b is present at the position of the setting item 502b, when the left button 216 and the right button 217 of the operation terminal 103 are pressed, the control unit 200 changes them per time It is determined that there is a large amount of left pan instruction and right pan instruction. That is, it is determined to change the projection direction.

  For example, when the cursor 501b is present at the position of the setting item 503b, when the left button 216 and the right button 217 of the operation terminal 103 are pressed, the control unit 200 determines the amount of change per hour. It is determined that there are few left pan instructions and right pan instructions. That is, it is determined to change the projection direction.

  For example, when the cursor 501b is present at the position of the setting item 504b, when the left button 216 and the right button 217 of the operation terminal 103 are pressed, the control unit 200 determines the amount of change per hour. It is determined that there are many upper tilt instructions and lower tilt instructions. That is, it is determined to change the projection direction.

  For example, when the cursor 501b is present at the position of the setting item 505b, when the left button 216 and the right button 217 of the operation terminal 103 are pressed, the control unit 200 determines the amount of change per hour. It is determined that there are few, upper tilt instructions and lower tilt instructions. That is, it is determined to change the projection direction.

  Such a determination is made, and if it is determined that the projection direction is to be changed, the process proceeds to S203, and if it is determined that it is not determined, the process proceeds to S201.

  Since S301, S302, S303, and S304 correspond to S201, S202, S203, and S206, respectively, and the same processing is performed, the description will be omitted. However, the transition destination of S304 is S305.

  In S305, the control unit 200 determines whether there is a setting item to be switched in mode, based on the operation instruction determined in S200. Specifically, if the pan / tilt setting (corresponding to the setting items 502 b and 504 b) has a large amount of change per time, it is determined that the mode should be switched, and the process transitions to S 306. On the other hand, if the pan / tilt setting (corresponding to the setting items 503 b and 505 b) has a small amount of change per time, it is determined that the mode should not be switched, and the process transitions to S 311.

  S306, S307, S308, S309, S310, S311, and S312 correspond to S212, S213, S214, S215, S216, S216, S204, and S205, respectively, and the same processing is performed, and thus the description thereof is omitted.

  It should be noted that the above-mentioned "large amount of change" and "small amount of change" may be determined based on comparison with a predetermined amount as well as switching according to the type of operation menu.

  Moreover, based on the absolute value of the amount of change, determination may be made based on the amount of change per unit time, in addition to the determination of “large” or “small”. Then, it may be determined that "the amount of change is large" or "the amount of change is small" depending on whether the number of changes per unit time is larger or smaller than a predetermined amount.

  According to this example, as in the first embodiment, although the user is irradiated with the light from the projection unit 205, the glare can be reduced, and the interior of the room is made dark or nearly so. You can prevent that.

  Furthermore, according to the present embodiment, when the pan or tilt is finely adjusted, the low illumination mode is not set and the convenience of the fine adjustment is improved.

Fourth Embodiment
The present invention is also applicable to the configuration obtained by modifying the third embodiment. The difference from the third embodiment will be described.

<Characteristic operation flow of the projector>
The characteristic flow of the control unit 200 described in the third embodiment is modified as follows. The following description will be made focusing on the deformation points while omitting the description of the common points.

  Transform S300 as follows. In the present embodiment, since the menu image to be displayed is different from that of the third embodiment, the difference due to the difference in the menu image will be described. The menu image displayed in the present embodiment is shown in FIG. 500 c is an example of a menu image. A plurality of setting items exist in the menu image 500c, and one of the setting items can be selected by the cursor 501c. In this example, there are a setting item 502 c for adjusting the pan, a setting item 503 c for adjusting the tilt, and a setting item 504 c for adjusting the horizontal lens shift. Further, there are setting items of setting item 505c for adjusting vertical lens shift, setting item 506c for adjusting horizontal image shift, and setting item 507c for performing vertical image shift.

  As described above, when there is a menu display instruction, a menu erase instruction, or a cursor movement instruction based on pressing of the menu button 213, the upper button 214, or the lower button 215, it is determined that the projection direction is not changed.

  On the other hand, for example, when the cursor 501c is present at the position of the setting item 502c, when the left button 216 and the right button 217 of the operation terminal 103 are pressed, the control unit 200 instructs left pan and right Judge as pan instruction. That is, it is determined to change the projection direction.

  For example, when the cursor 501c is at the position of the setting item 503c and the left button 216 and the right button 217 of the operation terminal 103 are pressed, the control unit 200 instructs them to tilt upward and downward. It is determined that That is, it is determined to change the projection direction.

  For example, when the cursor 501c is present at the position of the setting item 504c, when the left button 216 and the right button 217 of the operation terminal 103 are pressed, the control unit 200 instructs them to shift the left lens and the right lens. Judge as shift instruction. That is, it is determined to change the projection direction.

  For example, when the cursor 501c is present at the position of the setting item 505c, when the left button 216 and the right button 217 of the operation terminal 103 are pressed, the control unit 200 instructs them to shift to the upper lens, lower lens Judge as shift instruction. That is, it is determined to change the projection direction.

  For example, when the cursor 501c is present at the position of the setting item 506c, when the left button 216 and the right button 217 of the operation terminal 103 are pressed, the control unit 200 instructs them to shift the left image and the right image. Judge as shift instruction. That is, it is determined to change the projection direction.

  For example, when the cursor 501 c is present at the position of the setting item 507 c and the left button 216 and the right button 217 of the operation terminal 103 are pressed, the control unit 200 instructs them to shift the upper image, lower image Judge as shift instruction. That is, it is determined to change the projection direction.

  S305 is transformed as follows. That is, if the setting determined in S300 is pan or shift, the control unit 200 determines that the mode should be switched, and transitions to S306. If the setting determined in S300 is lens shift or image shift, it is determined that the mode should not be switched, and the process transitions to S311.

  S311 is transformed as follows. That is, if the setting determined in S300 is pan or shift, the same processing is performed. On the other hand, if the setting determined in S300 is lens shift, the control unit 200 instructs the optical system control unit 224 to shift the lens based on the user's instruction. On the other hand, if the setting determined in S300 is an image shift, control unit 200 instructs panel drive unit 204 to shift the position of the image formed on liquid crystal panel 223 to the user based on the instruction. Do.

  According to this example, as in the first embodiment, although the user is irradiated with the light from the projection unit 205, the glare can be reduced, and the interior of the room is made dark or nearly so. You can prevent that.

  Furthermore, according to the present embodiment, when the display position of the projected image is finely adjusted by lens shift or image shift, the low illumination mode is not set and the convenience of the fine adjustment is improved.

Fifth Embodiment
The present invention is also applicable to the configuration obtained by modifying the third embodiment. The difference from the third embodiment will be described.

<Characteristic operation flow of the projector>
The characteristic flow of the control unit 200 described in the third embodiment is modified as follows. The following description will be made focusing on the deformation points while omitting the description of the common points.

  Transform S300 as follows. In the present embodiment, since the menu image to be displayed is different from that of the third embodiment, the difference due to the difference in the menu image will be described. The menu image displayed in the present embodiment is shown in FIG. 500 d is an example of a menu image. A plurality of setting items exist in the menu image 500d, and one of the setting items can be selected by the cursor 501d. In this example, there are three setting items: a setting item 502d for adjusting the pan, a setting item 503d for adjusting the tilt, and a setting item 504d for setting the projection direction preset.

  As described above, when there is a menu display instruction, a menu erase instruction, or a cursor movement instruction based on pressing of the menu button 213, the upper button 214, or the lower button 215, it is determined that the projection direction is not changed.

  On the other hand, for example, when the cursor 501d is present at the position of the setting item 502d, when the left button 216 and the right button 217 of the operation terminal 103 are pressed, the control unit 200 instructs them to pan left, right Judge as pan instruction. That is, it is determined to change the projection direction.

  For example, when the cursor 501d is at the position of the setting item 503d, when the left button 216 and the right button 217 of the operation terminal 103 are pressed, the control unit 200 instructs them to tilt upward and downward. It is determined that That is, it is determined to change the projection direction.

  For example, when the cursor 501d is present at the position of the setting item 504d, when the left button 216 and the right button 217 of the operation terminal 103 are pressed, the control unit 200 selects six preset options, the front, It is judged that the instruction is to select one of the wall, back wall, left wall, right wall, ceiling and floor. That is, it is determined to change the projection direction. In addition, it is assumed that the change amounts of pan, tilt, zoom, and focus are stored in advance as a set for each of these options.

  S305 is transformed as follows. That is, if the setting determined in S300 is designation by an absolute value to select a preset option, the control unit 200 determines that the mode should be switched, and transitions to S306. On the other hand, if the setting determined in S300 is relative designation of pan and tilt, it is determined that the mode should not be switched, and the process transitions to S311.

  According to this example, as in the first embodiment, although the user is irradiated with the light from the projection unit 205, the glare can be reduced, and the interior of the room is made dark or nearly so. You can prevent that.

  Furthermore, according to the present embodiment, when pan and tilt are finely adjusted and coarse adjustment is performed by selecting a preset option, the low illumination mode is not set at the time of fine adjustment and convenience of fine adjustment is improved. Do.

Reference Signs List 100 projector 200 control unit 208 camera 209 communication unit 210 actuator 221 light source 223 liquid crystal panel 225 projection optical system 227 diffusion unit

In order to achieve such an object, the projector according to the present invention comprises a light source, a modulation unit that modulates light from the light source based on an image signal, light from the light source, or light modulated by the modulation unit. projecting a projection means for projecting either outside, and a receiving unit that receives an instruction to change the projecting direction by the projection means, one of the light modulated by the light or modulating means from the light source in the projection means It is characterized by having a control means which controls to perform processing which dims the light currently projected by the projection means, when the instruction | indication which changes a projection direction is received by the reception means while doing.

Claims (11)

Light source,
A modulation unit that modulates light from the light source based on an image signal;
Projection means for projecting either light from the light source or light modulated by the modulation means to the outside;
Receiving means for receiving an instruction to change the projection direction by the projection means;
The projection unit receives an instruction to change the projection direction by the reception unit when the light from the light source or the light modulated by the modulation unit is projected by the projection unit. A projector comprising: control means for performing control to reduce the light projected by the projector.   The projection apparatus according to claim 1, further comprising: changing means for changing the projection direction of the projection means in accordance with the instruction received by the reception means.   The control means performs processing for reducing the light projected by the projection means in a part or all of the change period of the projection direction by the change means. The projection device according to.   4. The projection apparatus according to claim 3, wherein the control unit stops the process of reducing the light after the change of the projection direction is completed.   The processing according to any one of claims 1 to 4, wherein, in the processing of the light reduction by the control means, the control means controls the projection of the light projected by the projection means to a wide area. Projection device.   In the light reduction process, the control means performs at least one of a process of diffusing the projection light, a process of defocusing the projection light, and a process of widening the projection light. The projection apparatus according to any one of 1 to 5.   The control means executes the light reduction process when the change amount of the projection direction received by the reception means is more than a predetermined amount, and the change amount of the projection direction received by the reception means is a predetermined amount The projection apparatus according to any one of claims 1 to 6, wherein the light reduction process is controlled not to be performed if the number is smaller.   The control unit executes the light reduction process when the change amount per unit time of the projection direction received by the reception unit is more than a predetermined amount, and the unit of the projection direction received by the reception unit The projection apparatus according to any one of claims 1 to 6, wherein the light reduction process is controlled not to be performed when the amount of change per hour is smaller than a predetermined amount. The projection means has a lens shift function,
9. The projection according to any one of claims 1 to 8, wherein, when the projection direction is changed by the lens shift function, the control means performs control so as not to perform the light reduction processing. apparatus. It has human sense means to sense human existence,
When the human sense means does not detect a human, the control means controls so as not to process the light reduction even if the reception means receives an instruction to change the projection direction. A projection device according to any one of the preceding claims, wherein: Projection comprising a light source, modulation means for modulating light from the light source based on an image signal, and projection means for projecting either light from the light source or light modulated by the modulation means to the outside A control method of the device,
A receiving step of receiving an instruction to change the projection direction by the projection unit;
When the projection unit projects either the light from the light source or the light modulated by the modulation unit, the projection unit receives an instruction to change the projection direction in the reception step. A control method of a projection apparatus, comprising: a control step of performing control to reduce the light projected by the control unit.

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