JP2013134283A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device capable of suppressing power consumption while maintaining convenience.SOLUTION: A projector 1 includes: a lamp 201 which emits light; liquid crystal panels 203, 204, 205 which modulate the light from the lamp 201 according to a video signal; a human sensor 404 which senses existence of a human body; a video signal detection circuit 407a which detects that the video signal is input; and a CPU 401 which controls the lamp 201, and the liquid crystal panels 203, 204, 205. When operations for projecting an image are performed by motions of the lamp 201, and the liquid crystal panels 203, 204, 205, the CPU 401 continues the operations when the human sensor 404 does not sense the existence of the human body, and the video signal is input, and stops the operations based on that the human sensor 404 does not sense the existence of the human body, and the video signal is input.

Description

  The present invention relates to a projection display device that modulates light from a light source and projects the light onto a projection surface.

  2. Description of the Related Art Conventionally, projection display devices (hereinafter referred to as “projectors”) that modulate light from a light source and project it onto a projection surface have been widely used. In such projectors, as with other electric devices, suppression of power consumption is an issue.

  As a method for suppressing power consumption, a method of controlling operation based on the presence / absence of a person has been proposed for other electrical devices (see, for example, Patent Document 1). In this method, a so-called human sensor is used to determine the presence or absence of a person. For example, when it is determined that an electric device is not used based on a signal from the human sensor, Control for stopping the backlight of the operation unit in the device is executed (see, for example, Patent Document 1).

JP 2011-197222 A

  However, unlike other electrical devices, it may not be desirable for the projector to immediately stop operation in the absence of people around it.

  For example, in a scene in which products and articles are displayed using an image projected from a projector, it is desirable to continue projecting the image even if there are no people around. In such a scene, if the projection of the video is stopped, then the opportunity to touch the video is blocked, and the effect of the exhibition is diminished. That is, in such a situation, it is desirable that the convenience of projection is given priority over the suppression of power consumption.

  SUMMARY An advantage of some aspects of the invention is that it provides a projection display apparatus that can suppress power consumption while maintaining convenience.

  The projection display device according to the present invention includes a light source that emits light, a light modulation unit that modulates the light from the light source according to a video signal, a human body sensing unit that senses the presence of a human body, and the video A detection unit that detects that a signal is input; and a drive control unit that controls the light source and the light modulation unit. Here, when the driving control unit performs an operation of projecting an image by the operation of the light source and the light modulation unit, the human body sensing unit does not sense the presence of a human body, and the detection unit Based on the fact that when the video signal input is detected, the operation is continued, the human body sensing unit does not sense the presence of a human body, and the detection unit does not detect the video signal input. The operation is stopped.

  According to the projection display device of the present invention, even when there is no person around the projection display device, an image based on the image signal is projected on the screen while the image signal is being input. . Therefore, the convenience of projection is maintained.

Furthermore, according to the projection display device of the present invention, when there is no person in the surroundings and no video signal is input, the operation of the projection display device is stopped. Can be suppressed. For example, waste of electric power due to the operator forgetting to turn off power can be suppressed.

  Therefore, the power consumption required for driving can be suppressed while maintaining the convenience of the projection display device.

  The projection display apparatus according to the present invention may further include a notifying unit for notifying the stop of the operation prior to the stop of the operation by the drive control unit. In this case, the drive control unit is configured such that the human body sensing unit does not sense the presence of a human body and the detection unit does not detect the input of the video signal for a predetermined time after the notice by the notice unit. Based on this, the operation is stopped.

  According to this configuration, before the operation is stopped based on the fact that the presence of a human body is not sensed and the video signal is not input, the stop of the operation is notified. By the advance notice, the operator can know in advance that the operation has stopped, and convenience is improved.

  In the projection display device according to the present invention, the notice unit may be configured to cause the drive control unit to project a notice image for notifying the stop of the operation.

  According to this configuration, the operator and the viewer can easily know that the operation is stopped by looking at the preview image included in the projection screen projected on the screen, which is convenient.

  In the projection display device according to the present invention, the preview image may include an image that displays a remaining time until the operation is stopped.

  According to this configuration, the operator and the viewer can easily know the time until the operation is stopped, which is convenient.

  Furthermore, in the projection display device according to the present invention, the preview image may include an image for notifying that the video signal is not input.

  According to this configuration, the operator and the viewer can easily know that no video signal is input, which is convenient.

  Further, in the projection display device according to the present invention, the drive control unit may be configured such that the human body sensing unit senses the presence of a human body even when the detection unit does not detect the input of the video signal. You can continue driving.

  According to this configuration, for example, during the installation of the projection display device, the human body sensing unit senses the operator, so that the operation is not stopped. For this reason, when the operator finishes the connection work for inputting the video signal, the projection screen based on the video signal is immediately projected onto the screen, so that the convenience of the projection display device is enhanced.

  As described above, according to the present invention, it is possible to provide a projection display device capable of suppressing power consumption while maintaining convenience.

  The effects and significance of the present invention will become more apparent from the following description of embodiments. However, the following embodiment is merely an example when the present invention is implemented, and the present invention is not limited to what is described in the following embodiment.

It is a figure which shows the structure of the projector based on Embodiment. It is a figure which shows the structure of the optical engine based on embodiment. It is a figure which shows the structure of the circuit system of the projector based on Embodiment. It is a flowchart which shows the drive control process based on Embodiment. It is a figure which shows the structure of the circuit system of the projector based on the example of a change. It is a flowchart which shows the drive control process based on the example of a change. It is a projection screen projected on a screen based on drive control processing concerning a modification. It is a projection screen projected on a screen based on drive control processing concerning other modifications.

  Hereinafter, a projector 1 according to an embodiment will be described with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of the projector 1. Referring to FIG. 1, projector 1 includes a horizontally-long substantially rectangular parallelepiped cabinet 10 that is a casing. In the cabinet 10, a projection window 101 is formed on the left side of the front surface, and exhaust ports 102 and 103 for exhausting air from inside the cabinet 10 are formed on the right side and the right side surface of the front surface, respectively. An operation key group 104 is provided on the upper surface of the cabinet 10. The operation key group 104 includes a plurality of keys such as an operation key 104a for starting or stopping the operation of the projector 1.

  An optical engine 20 and a projection lens unit 30 are arranged inside the cabinet 10. The optical engine 20 generates image light modulated based on the image signal. A projection lens unit 30 is attached to the optical engine 20, and a front end portion of the projection lens unit 30 is exposed forward from the projection window 101. The projection lens unit 30 enlarges and projects the image light generated by the optical engine 20 onto a screen disposed in front of the projector 1.

  FIG. 2 is a diagram showing a configuration of the optical engine 20.

  As shown in FIG. 2, the optical engine 20 includes a lamp 201, a light guide optical system 202, three transmissive liquid crystal panels 203, 204, 205, and a dichroic prism 206. Note that polarizing plates (not shown) are arranged on the incident side and the emission side of the liquid crystal panels 203, 204, and 205.

  The lamp 201 is, for example, a metal halide lamp, a xenon lamp, or the like. White light emitted from the lamp 201 is converted into light in the red wavelength band (hereinafter referred to as “R light”), light in the green wavelength band (hereinafter referred to as “G light”), and blue wavelength by the light guide optical system 202. The light is separated into band light (hereinafter referred to as “B light”) and applied to the liquid crystal panels 203, 204, and 205. The R light, G light, and B light modulated by the liquid crystal panels 203, 204, and 205 are color-combined by the dichroic prism 206 and emitted as video light.

  In addition to the transmissive liquid crystal panels 203, 204, and 205, a reflective liquid crystal panel or a MEMS device can be used as the light modulation element that constitutes the optical engine 20. Further, the optical engine 20 may be configured by a single plate type optical system using one light modulation element and a color wheel, for example, instead of the three plate type optical system including the three light modulation elements as described above. it can.

  FIG. 3 is a diagram showing a configuration of a circuit system of the projector 1.

  The projector 1 includes a control circuit unit 40 for controlling the liquid crystal panels 203, 204, 205, the lamp 201, and the like. The control circuit unit 40 includes a CPU 401, a memory 402, a key input circuit 403, a human sensor 404, an input switching circuit 405, an A / D converter 406, a signal processing circuit 407, a panel drive circuit 408, a lamp drive circuit 409, and a cooling fan 410. The fan drive circuit 411 is included.

  The key input circuit 403 outputs an operation signal corresponding to the operation of each key of the operation key group 104 to the CPU 401.

  The human sensor 404 is a sensor that senses the presence of a human body around the projector 1. The human sensor 404 includes, for example, an infrared sensor that detects infrared rays emitted from the human body. When the infrared sensor detects infrared rays, the human sensor 404 outputs a human body detection signal indicating that the human body is detected to the CPU 401.

  The human sensor 404 is not limited to infrared rays, and may include a sensor that detects visible light, ultrasonic waves, or the like reflected from the human body. In this case, when the sensor detects visible light or ultrasonic waves, a human body sensing signal indicating that the presence of the human body is sensed is output to the CPU 401. Further, the human sensor 404 may be configured to detect the presence of a human body by performing predetermined image processing on an image captured by a camera and extracting an image of a person in the vicinity from the image. Good.

  The input switching circuit 405 switches input terminals to be connected from among a plurality of input terminals. An external video signal is input through an input terminal connected by the input switching circuit 405. If the input video signal is an analog signal, it is converted into a digital video signal by the A / D converter 406 and input to the signal processing circuit 407. If the video signal is a digital signal, it is input to the signal processing circuit 407 without going through the A / D converter 406.

  The signal processing circuit 407 performs various corrections such as scaling correction (correction of the number of pixels), white balance correction, and gamma correction on the input video signal. In addition, when the video signal is a signal other than the RGB signal, the signal processing circuit 407 converts the signal into an RGB signal.

  The RGB signals output from the signal processing circuit 407 are input to the panel drive circuit 408. The panel drive circuit 408 drives the liquid crystal panels 203, 204, and 205 according to the input RGB signals.

  The signal processing circuit 407 includes a video signal detection circuit 407a. The video signal detection circuit 407 a detects that a video signal is input from the input switching circuit 405 and outputs a video detection signal based on the detection to the CPU 401. Based on the video detection signal from the signal processing circuit 407, the CPU 401 can determine whether or not a video signal is currently input from the input switching circuit 405.

  The cooling fan 410 is built in the cabinet 10. The cooling fan 410 takes in outside air from an air inlet (not shown) provided in the cabinet 10 to air-cool each part of the light guide optical system 202 and exhausts air used for air cooling from the air outlets 102 and 103. To do.

The fan drive circuit 411 drives the cooling fan 410 according to a control signal from the CPU 401.

  The memory 402 includes RAM and ROM. The memory 402 stores a control program for giving a control function to the CPU 401.

  The CPU 401 operates the projector 1 according to the control program stored in the memory 402.

  The CPU 401 includes a drive control unit 401a in order to execute a drive control process described below with reference to FIG. The function of the drive control unit 401 a is given to the CPU 401 by a program stored in the memory 402.

  FIG. 4 is a flowchart showing the drive control process. The drive control process is a process for continuing and stopping the operation of the projector 1 based on the human body detection signal from the human sensor 404 and the video detection signal from the signal processing circuit 407 in a state where the projector 1 is in operation. is there.

  When the operation of the operation key 104a is detected in a state where the operation of the projector 1 is stopped, the drive control unit 401a starts executing the drive control process. First, the drive control unit 401a starts the operation of the projector 1 by driving the lamp 201, the liquid crystal panels 203, 204, and 205 and the cooling fan 410 (S101).

  After the start of the operation of the projector 1, the drive control unit 401a determines whether or not the presence of a human body around the projector 1 is detected by the human detection sensor 404 based on the human body detection signal from the human detection sensor 404 (S102). ). When the presence of the human body is not detected (S102: NO), the drive control unit 401a determines whether or not a video signal is input based on the video detection signal from the video signal detection circuit 407a (S103).

  If the presence of a human body is not detected (S102: NO) and no video signal is input (S103: NO), the drive control unit 401a stops the operation of the projector 1 (S105).

  When the presence of a human body is sensed (S102: YES) or when a video signal is input (S103: YES), the drive control unit 401a is in a driving stop operation, that is, in a state where the projector 1 is being driven. It is determined whether or not an operation has been performed on the operation key 104a (S104). When it is determined that the operation stop operation has not been performed (S104: NO), the drive control unit 401a performs the processes of steps S102 and S103 again. When it is determined that the operation stop operation has been performed (S104: YES), the drive control unit 401a stops the operation of the projector 1 by stopping the lamp 201, the liquid crystal panels 203, 204, 205, and the cooling fan 410 (S105). ).

  For example, immediately after the operation of the operation key 104a for starting the operation of the projector 1 is performed by the operator, since the operator is near the projector 1, the human sensor 404 detects the presence of a human body (S102: YES) ). In this case (S102: YES), the operation of the projector 1 is continued unless the operation stop operation is performed (S104: NO → S102: YES).

As shown by the flowchart of FIG. 4, the drive control unit 401a, when the presence of a human body is detected regardless of the operating state of the projector 1 detected by the video signal detection circuit 407a (S102: YES), The operation of the projector 1 is continued. For example, after the operation of the projector 1 is started as in the above example, the operator performs an operation for connecting an output terminal of a device such as a personal computer that outputs a video signal and an input terminal provided in the projector 1. May do. In such a scene, the drive control unit 401a determines that a human body (operator) is detected, and determines YES in step S102 even though no video signal is input. That is, the operation of the projector 1 is continued.

  Even when the presence of a human body is not detected (S102: NO), the drive control unit 401a continues the operation of the projector 1 when a video signal is input (S103: YES).

  For example, when a performance using the projector 1 is performed in an exhibition hall or the like, a projection screen based on the video signal is projected on a screen arranged in the exhibition hall. In such a scene, the viewer may not be around the projector 1 during the performance. Even in such a case, when the video signal is input (S103: YES), the operation of the projector 1 is continued.

  As described above, according to the present embodiment, even when there is no person around projector 1, projection screen 50 based on the video signal is projected on the screen while the video signal is being input. Therefore, the convenience of projection is maintained.

  Further, according to the present embodiment, when there is no person in the vicinity and no video signal is input, the operation of projector 1 is stopped. Therefore, priority is given to suppression of power consumption. For example, waste of electric power due to the operator forgetting to turn off the power can be suppressed.

  Therefore, according to the present embodiment, it is possible to suppress power consumption required for driving while maintaining the convenience of the projector 1.

  Further, according to the present embodiment, the drive control unit 401a operates when the human sensor 404 senses the presence of a human body even when the video signal detection circuit 407a does not detect the input of the video signal. continue. Therefore, for example, during the installation work of the projector 1, since the human sensor 404 senses the operator, the operation of the projector 1 is not stopped. Therefore, when the operator finishes the connection work for inputting the video signal, the projection screen based on the video signal is immediately projected on the screen, and the convenience of the projector 1 is high.

<Example of change>
FIG. 5 is a diagram showing the configuration of the circuit system of the projector 1 according to this modification. FIG. 6 is a flowchart showing a drive control process according to this modification. FIG. 7 is a diagram showing a projection screen projected on the screen based on the drive control process.

  In addition to the drive control unit 401a, the CPU 401 according to this modification example further includes a notice unit 401b as shown in FIG. Based on the drive control process shown in FIG. 6, the notice unit 401b gives a notice of the stop of the operation prior to the drive control unit 401a stopping the operation of the projector 1. Similar to the drive control unit 401 a, the function of the notice unit 401 b is given to the CPU 401 by a program stored in the memory 402.

  In the flowchart of FIG. 6, steps S111 to S116 are added to the flowchart shown in FIG. The processes in steps S111 to S116 are executed by the notice unit 401b after determining NO in step S103.

  The drive control process according to the present modification example will be described below.

  When the projector 1 is in operation (S101), the presence of a human body is not sensed (S102: NO) and no video signal is input (S103: NO), the notice unit 401b performs steps S111 to S116. Execute the process.

  In step S111, the notice unit 401b first starts measuring time (T) using a timer provided in the CPU 401. The time T represents the time during which the presence of the human body is not sensed (S113: NO) and the state where the video signal is not input (S114: NO) continues.

  After the timer is started (S111), the notice unit 401b displays a notice image 501 for notifying the stop of the operation of the projector 1 as shown in FIG. 7 (S112).

  Specifically, in step S112, the notice unit 401b first includes an image 501a that displays the time until the operation of the projector 1 is stopped, and an image 501b that indicates that the projection of the projection screen 50 is stopped. Processing for generating the preview image 501 is executed. Next, the notice unit 401b causes the drive control unit 401a to project the projection screen 50 including the generated notice image 501. By projecting the projection screen 50 including the preview image 501 onto the screen, the preview image 501 is displayed on the screen.

  Here, the time until the operation of the projector 1 is stopped means a difference T0-T between the predetermined time T0 and the time T. The predetermined time T0 is a process of stopping the operation of the projector 1 (S105) when the presence of the human body is not detected by the human sensor 404 (S113: NO) and no video signal is input (S114: NO). ) Is a predetermined length of time until execution. The predetermined time T0 is set in advance, for example, about several seconds to several minutes.

  After the notice image 501 for notifying the stop of driving is displayed (S112), if the presence of a human body is not sensed (S113: NO) and no video signal is input (S114: NO), a notice is given. The unit 401b determines whether or not the time T has exceeded the predetermined time T0, that is, whether or not T> T0 is satisfied (S115).

  When the process of step S115 is executed immediately after the start of the timer in step S111, the time T does not satisfy the predetermined time T0 (S115: NO). In this case, the notice unit 401b determines whether or not an operation for stopping operation is detected by the CPU 401 in step S116. The determination process in step S116 is the same as the determination process in step S104. When the operation stop operation is performed (S116: YES), the drive control unit 401a stops the operation of the projector 1 (S105). After stopping the operation, the drive control process in FIG. 6 ends.

  If the operation stop operation has not been performed (S116: NO), the drive control process proceeds to step S112, and the notice unit 401b executes the display process of step S112 again. When the display process of step S112 is executed after the second time, the remaining time (T0-T) in the image 501a is updated in the preview image 501.

  That is, when the processes in steps S112 to S116 are repeatedly executed as a loop process, the remaining time T0-T in the image 501a updated as time passes decreases.

Thereafter, when the remaining time is zero, that is, when the time T reaches the predetermined time T0, it is determined as YES in the determination process of step S115 (S115: YES). In this case, the drive control unit 401a stops the operation of the projector 1 (S105) and ends the drive control process.

  Even when the operation stop operation is performed before the time T reaches the predetermined time T0 (S116: YES), the drive control unit 401a stops the operation of the projector 1 (S105) and ends the drive control process.

  When the presence of a human body is detected before the time T reaches the predetermined time T0 (S113: YES), or when an input of a video signal is detected (S114: YES), the notice unit 401b determines in step S112. The display of the preview image 501 displayed based on the display process is canceled by the drive control unit 401a (S117), and the timer that started timing in step S111 is stopped (S118). After the timer is stopped, the drive control unit 401a returns to the process of step S104 described in the above embodiment. In this case, while the operation stop operation is not performed (S104: NO), the determination process regarding the presence of the human body (S102) and the presence / absence of the video signal input (S103) is repeated as described in the above embodiment. Executed.

  As described above, according to the configuration of the present modified example, before the operation is stopped based on the fact that the presence of the human body is not detected and the video signal is not input, the advance notice 401b notifies the stop of the operation. Made. By the advance notice, the operator can know in advance that the operation of the projector 1 is stopped, and convenience is improved.

  Further, during the predetermined time T0 after the advance notice is made, the driving control is performed based on the fact that the human sensor 404 does not detect the presence of the human body and the video signal detection circuit 407a does not detect the input of the video signal. The unit 401a stops operation. According to this configuration, after the advance notice, when the presence of a human body is not sensed and no video signal is input, the operation of the projector 1 is stopped. In this case, power consumption can be suppressed.

  Further, according to the configuration of this modified example, the projection screen 50 including the preview image 501 for notifying the stop of the operation of the projector 1 is projected on the screen. It is convenient for the operator and the viewer to know that the operation is easily stopped by viewing the preview image 501 included in the projection screen 50 projected on the screen.

  Further, according to the configuration of this modified example, the preview image 501 includes an image that displays the remaining time (T0-T) until the operation is stopped, so that the operator and the viewer are stopped from driving. It is easy to know the time until it is convenient.

<Others>
As mentioned above, although this Embodiment and the modification were demonstrated, this invention is not restrict | limited at all to the said embodiment and modification, Moreover, embodiment of this invention is other than the said embodiment. Various modifications are possible.

  For example, in the above modification, the notice unit 401b displays a notice image 501 including an image 501a that displays the time until the operation of the projector 1 is stopped and an image 501b that indicates that projection of the projection screen 50 is to be stopped. To do. For example, as shown in FIG. 8, a preview image 501 including an image 501a for displaying the time until the operation of the projector 1 is stopped and an image 501c for notifying that a video signal is not input is provided. It may be configured to be displayed on a screen. Further, a preview image 501 including any one or more of the image 501a, the image 501b, and the image 501c may be displayed.

  Furthermore, in the above-described embodiment, the lamp 201 is used as a light source.

  In addition, the embodiment of the present invention can be variously modified as appropriate within the scope of the technical idea shown in the claims.

1. Projector (Projection display device)
50 images (projection screen)
201 lamp (light source)
203, 204, 205 Liquid crystal panel (light modulator)
401a Drive control unit 401b Notification unit
404 Human sensor (human body sensing unit)
407a Video signal detection circuit (detection unit)
501 notice image

Claims (6)

A light source that emits light;
A light modulator that modulates the light from the light source in accordance with a video signal;
A human body sensing unit for sensing the presence of a human body,
A detection unit for detecting that the video signal is input;
A drive control unit for controlling the light source and the light modulation unit,
The drive control unit, when performing an operation of projecting an image by the operation of the light source and the light modulation unit, the human body sensing unit does not sense the presence of a human body, and the detection unit is the video signal The operation is continued, the human body sensing unit does not sense the presence of a human body, and the detection unit does not detect the input of the video signal. To stop the
A projection display device characterized by that. The projection display device according to claim 1,
Prior to the stop of the operation by the drive control unit, further comprising a notice unit for notifying the stop of the operation,
The drive control unit is based on the fact that the human body sensing unit does not sense the presence of a human body for a predetermined time after the notice by the notice unit, and the detection unit does not detect the input of the video signal. Stop the operation,
A projection display device characterized by that. The projection display device according to claim 2,
The advance notice unit causes the drive control unit to project an advance notice image for notifying the stop of the operation.
A projection display device characterized by that. The projection display device according to claim 3,
The preview image includes an image that displays a remaining time until the operation is stopped.
A projection display device characterized by that. The projection display device according to claim 3 or 4,
The projection display device, wherein the preview image includes an image for notifying that the video signal is not input. The projection display device according to any one of claims 2 to 5,
The drive control unit continues the operation when the human body sensing unit senses the presence of a human body even when the detection unit does not detect the input of the video signal.
A projection display device characterized by that.

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