JP2009099171A - Image display system, projector, and power supply control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably and easily recognize that an information medium is mounted, and to easily unmount the mounted information medium. <P>SOLUTION: An image display system comprises a medium reproducing section for detecting whether the optical disk (information medium) is mounted or not and reproducing an optical disk to output image data, a power supply, and a controller for controlling the power supply and displaying the image based on the image data on a display. When an instruction is given to stop power supply, and when detecting that the optical disk is not mounted(steps 41 and 42), the controller stops power supply (steps 43 and 44). When detecting that the optical disk is mounted(steps 41 and 42), the controller displays a first message therefor on the display (step 45). The controller stops the power supply (steps 43 and 44) when detecting that the optical disk is not mounted. (steps 47 and 48). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image display device and a projector provided with a medium playback unit for executing playback processing on an information medium, and a power control method for controlling a power supply unit of the image display device.

  Today, an optical disk player (image display device) configured to be able to reproduce an optical disk (information medium) is widely used. In this type of image display device, when the power switch is operated during or after the reproduction of the optical disc, the power is shut off while the optical disc is inserted into the disc drive device. In this case, it is difficult to specify whether or not an optical disk is inserted in the disk drive device in a state where the power is shut off. Therefore, for example, after the reproduction of the optical disk rented from the rental company is completed, the user forgets to take out the optical disk from the disk drive device, shuts off the power supply, and may return only the housing case to the rental company. In this case, the optical disk is taken out from the disk drive device and returned after the expiration of the return deadline, but a late fee is charged.

In order to solve the above problems, Japanese Patent Application Laid-Open No. 63-217568 discloses an optical disk having a configuration in which an alarm sound is output when the power is turned off without taking out an optical disk medium (hereinafter also referred to as “optical disk”). A medium protection alarm mechanism (hereinafter also referred to as “alarm mechanism”) is disclosed. Specifically, in this alarm mechanism, when an optical disc is inserted into the optical disc apparatus, the load sensor detects the insertion (loading) of the optical disc and outputs a signal to the determination controller. On the other hand, when the power is shut off, the power-off state detection circuit detects the power-off (power-off) and outputs a signal to the determination control controller. At this time, the determination controller determines that the optical disk is inserted based on the signal from the load sensor, determines that the power is cut off based on the signal from the power-off state detection circuit, and generates an alarm. Output a signal to the circuit. In response to this, the alarm circuit outputs an alarm sound accordingly. This makes it possible for the user to recognize that the optical disk is still inserted.
JP 63-217568 A (2nd page, FIG. 1)

  However, the conventional alarm mechanism has the following problems. That is, the conventional alarm mechanism employs a configuration in which an alarm sound is output when the power is turned off while the optical disk is inserted. However, in the conventional alarm mechanism, in order to take out the optical disk from the optical disk apparatus when the user notices that the optical disk has been inserted by the output of the alarm sound, the power switch is operated by operating the power switch. It is necessary to operate a disk ejection switch or the like after the loading and the start of the optical disk apparatus is completed. For this reason, the conventional alarm mechanism has a problem that when the power is turned off with the optical disc inserted, the operation for taking out the optical disc is complicated and the time required for taking out the optical disc is very long. . Further, as described above, in this type of optical disc apparatus (recording / reproducing apparatus), it is difficult to specify whether or not an optical disc is inserted into the optical disc apparatus when the power is cut off. In the mechanism, there is a problem that it is difficult for the user to recognize that the optical disk is still inserted when the alarm sound is missed.

  The present invention has been made in view of such a problem, and makes it possible to reliably and easily recognize that the information medium is mounted, and to easily remove the mounted information medium, A main object is to provide a projector and a power supply control method.

  In order to achieve the above object, an image display device according to the present invention is configured to detect whether or not an information medium is mounted, and performs reproduction processing on the mounted information medium to output image data by executing reproduction processing. An image display device including a control unit, a power supply unit, and a control unit that controls the power supply unit and causes the display unit to display an image based on the output image data. When instructed, if the medium reproducing unit detects that the information medium is not mounted, the power supply unit is controlled to stop the supply of power, and the medium reproducing unit mounts the information medium. Is detected, the first message notifying that the information medium is loaded is displayed on the display unit, and then the information reproducing medium is displayed by the medium reproducing unit. It controls the power supply unit when the non-wearing state has been detected to stop the supply of the power supply.

  In addition, the power control method according to the present invention includes a medium reproduction unit that executes reproduction processing on an attached information medium and outputs image data, and is configured to display an image based on the image data on the display unit. A power supply control method for controlling a power supply unit of an image display device, wherein when the medium playback unit detects that the information medium is not attached when power-off is instructed, the power supply unit is controlled. When the supply of power is stopped and the information reproducing state of the information medium is detected by the medium reproducing unit, a first message for notifying that the information medium is attached is displayed on the display unit and thereafter When the medium playback unit detects that the information medium is not attached, the power supply unit is controlled to stop the supply of power.

  In this image display device and the power control method, when the power-off is instructed, when the information medium non-attachment state is detected, the power supply unit is controlled to stop the supply of power, and the information medium attachment state Is detected, the first message notifying that the information medium is loaded is displayed on the display unit, and when the non-mounted state is detected after that, the power source unit is controlled to supply power. Stop. Therefore, according to the image display device and the power control method, not only the user can recognize that the information medium is still attached by displaying the first message, but also the power switch is operated. Regardless of the operation of the image display device that the power is not shut off, the user can be surely recognized that the information medium is still attached. Further, according to this image display apparatus and its power control method, when the user determines that the information medium needs to be taken out, the power is not shut off, so the apparatus is turned on to take out the information medium. Unlike conventional alarm mechanisms that need to be reworked, the information medium can be quickly and easily removed.

  In the image display device according to the present invention, after the control unit causes the display unit to display the first message, the medium reproduction unit continuously detects the information medium mounting state. When the power-off is instructed again in the state, the power supply is controlled to stop the supply of power.

  According to this image display device, when the control unit displays the first message on the display unit and then the power-off is instructed again in a state where the mounting state of the information medium is continuously detected, By stopping the supply of power by controlling the power supply unit, when the user determines that there is no need to take out the information medium, the power supply can be immediately shut down by re-operating the power switch. For this reason, according to this image display device, it is possible to avoid a situation in which power is unnecessarily consumed as compared with a configuration in which a power supply is maintained even when it is not necessary to take out an information medium. be able to.

  Furthermore, in the image display device according to the present invention, when the control unit is instructed to turn on the power, the control unit controls the power source unit to start supplying the power, and the medium reproducing unit loads the information medium. Is detected, a second message notifying that the information medium is loaded is displayed on the display unit.

  According to this image display device, when the control unit controls the power source unit to start the power supply when the power-on is instructed, and the medium reproducing unit detects the information medium mounting state, By displaying the second message informing that the medium is loaded on the display unit, for example, if the user forgets to remove the information medium when the power is turned off, the second message is displayed when the power is turned on thereafter. Is displayed, the user can be surely recognized that the information medium is still attached.

  In the image display device according to the present invention, when the control unit is instructed to switch the input source and the medium playback unit detects the mounting state of the information medium, the information medium is mounted. The display unit displays a third message that informs the user that the information is being displayed.

  According to this image display device, when the control unit is instructed to switch the input source and the medium playback unit detects the mounting state of the information medium, the control unit notifies that the information medium is mounted. By displaying the message 3 on the display unit, not only does the user recognize by the display of the third message that the information medium is still attached, but also operates the input source changeover switch. Nevertheless, the operation of the image display device that the input source is not switched can make the user surely recognize that the information medium is still attached.

  The projector according to the present invention includes any one of the image display devices described above and a projection mechanism as the display unit.

  According to this projector, since any one of the image display devices described above and the projection mechanism as the display unit are configured, it is not necessary to turn on the power again to take out the information medium. The number of times of lighting can be reduced sufficiently. For this reason, according to this projector, the lifetime of a light source lamp etc. can be extended.

  The best mode of an image display device, a projector, and a power control method according to the present invention will be described below with reference to the accompanying drawings. A projector 1 shown in FIG. 1 is a front projection type projector which is an example of an image display device according to the present invention, and includes an optical disc playback unit 2, an external signal input unit 3, a video processing unit 4, a video projection unit 5, and an audio. A processing unit 6, an audio output unit 7, a signal processing unit 8, an operation unit 9, a power supply unit 10 and a control unit 11 are provided. The optical disk playback unit 2 corresponds to the medium playback unit of the present invention, and is a disk drive device (not shown) that can mount an optical disk (for example, DVD or BD (registered trademark)) that is an example of an information medium of the present invention. And is configured to be able to execute reproduction processing on the optical disc. Specifically, the optical disc playback unit 2 generates a video signal Sv1 (an example of image data in the present invention) based on the video / audio data read from the optical disc, outputs the video signal Sv1 to the video processing unit 4, and outputs the audio signal Sa1. Generate and output to the voice processing unit 6.

  The external signal input unit 3 generates the video signal Sv1 and the audio signal Sa1 based on the video / audio signal Sav output from various audiovisual devices (such as an optical disc player, a digital tuner, and a personal computer), and generates the generated video signal Sv1. In addition to outputting to the video processing unit 4, the generated audio signal Sa <b> 1 is output to the audio processing unit 6. The external signal input unit 3 is a so-called input source switching unit, and, as will be described later, when a switch operation for instructing switching of the input source is performed, a plurality of audiovisual devices are controlled according to the control of the control unit 11. Is connected to the video processing unit 4 and the audio processing unit 6 so that the video signal Sv1 and the audio signal Sa1 generated as described above on the basis of the video / audio signal Sav output from the audiovisual device are processed by the video processing unit. 4 and the audio processing unit 6 respectively.

  The video processing unit 4 constitutes a control unit according to the present invention in combination with the control unit 11, and generates a video signal Sv 2 based on the video signal Sv 1 output from either the optical disc playback unit 2 or the external signal input unit 3. At the same time, the generated video signal Sv2 is output to the video projection unit 5 to display the video (image) of the video / audio signal Sav. The image projection unit 5 corresponds to a projection mechanism in the present invention, and includes a light source lamp, a lamp driving unit, a liquid crystal light valve (an example of a light modulation element), a light valve driving unit (an example of a modulation element driving unit), a projection lens, and the like ( None of them is shown, and the light from the light source lamp is modulated by the liquid crystal light valve based on the video signal Sv2 output from the video processing unit 4 and is then screened through the projection lens 12 (FIGS. 3, 6). 7) (see image on the screen 12 based on the video signal Sv2). In this case, the light source lamp disposed in the image projection unit 5 is constituted by a metal halide lamp or a high-pressure mercury lamp, for example, and emits white light by being turned on according to the control of the lamp driving unit.

  The audio processing unit 6 generates an audio signal Sa2 based on the audio signal Sa1 output from either the optical disc playback unit 2 or the external signal input unit 3, and outputs the generated audio signal Sa2 to the audio output unit 7. The audio of the video / audio signal Sav is output. The audio output unit 7 includes an amplifier and a speaker (not shown), and outputs audio based on the audio signal Sa2 output from the audio processing unit 6 from the speaker. When the operation signal S0 is output from the operation unit 9 disposed in the main body of the projector 1, the signal processing unit 8 receives an operation signal S0 (infrared signal as an example) from a remote controller (not shown). When output, the operation signal S1 corresponding to the operation signal S0 is generated and output to the control unit 11. In this case, the operation unit 9 and the remote controller are provided with various operation switches such as a power switch and an input source changeover switch. The power supply unit 10 supplies power to each unit of the projector 1 under the control of the control unit 11.

  The control unit 11 generally controls the projector 1. Specifically, the control unit 11 responds to the operation signal S1 output from the signal processing unit 8 with the optical disc playback unit 2, the external signal input unit 3, the video processing unit 4, the video projection unit 5, and the audio processing unit 6. And controls the operation of the audio output unit 7. Further, as will be described later, the control unit 11 executes the power-on process 20 (see FIG. 2) and the power-off process 40 (see FIG. 5) to control the operation of the power supply unit 10 according to the power control method according to the present invention. To do. Further, the control unit 11 controls the operation of the external signal input unit 3 by executing an input source switching process 30 (see FIG. 4) as will be described later.

  In the projector 1, when the power is shut off, for example, when the power switch in the operation unit 9 is operated and the operation signal S0 is output, the signal processing unit 8 generates and controls the operation signal S1. Output to the unit 11 (an example of “when power-on is instructed”). In response to this, the control unit 11 starts the power-on process 20 shown in FIG. In the power-on process 20, the control unit 11 first outputs a control signal S5 to the power supply unit 10 (controls the power supply unit 10) to start supplying power to each unit of the projector 1 (step 21). At this time, the light source lamp is turned on in the image projection unit 5 with the supply of power. Next, the control unit 11 outputs a control signal S2a to the optical disc playback unit 2 to detect whether or not an optical disc is loaded in the disc drive apparatus (step 22).

  At this time, when the optical disk is not loaded, the optical disk reproducing unit 2 outputs a detection signal S2b indicating a non-mounted state to the control unit 11. In response to this, the control unit 11 determines that no optical disc is loaded in the optical disc playback unit 2 (step 23), and ends the power-on process 20. On the other hand, when an optical disk is loaded in the disk drive device, the optical disk reproducing unit 2 outputs a detection signal S2b indicating the loaded state to the control unit 11. In response to this, the control unit 11 determines that an optical disc is loaded in the optical disc playback unit 2 (step 23), and outputs a control signal S3 to the video processing unit 4 to display a predefined message. (Step 24). As a result, the video processing unit 4 generates a video signal Sv2 for displaying a message in accordance with the control signal S3 from the control unit 11 and outputs it to the video projection unit 5.

  In response to this, the image projection unit 5 modulates and outputs the light from the light source lamp, and as shown in FIG. 3, a message M1 “The optical disc is still inserted” (“No. An example of “message 2”) is projected onto the screen 12. By projecting this message M1, the user recognizes that the optical disk is still in the disk drive device. Further, the control unit 11 ends the power-on process 20 when a predetermined time (for example, 5 seconds) elapses (step 25). Thereafter, by operating the playback switch of the operation unit 9 with the optical disc mounted in the optical disc playback unit 2 (disk drive device), the optical signal playback unit 2 outputs the audio signal Sa1 and the video signal Sv1, and video projection is performed. The unit 5 projects the video (image) of the video signal Sv2 output from the video processing unit 4 onto the screen 12, and the audio output unit 7 outputs the audio of the audio signal Sa2 output from the audio processing unit 6.

  On the other hand, the projector 1 displays a video (image) based on a video / audio signal Sav output from an audiovisual device (for example, a digital tuner) as an external device when the optical disc playback unit 2 plays back an optical disc. When the input source switching operation is performed, the control unit 11 executes the input source switching process 30 shown in FIG. Specifically, when an input source changeover switch in the operation unit 9 is operated and an operation signal S1 corresponding to the switch operation is output from the signal processing unit 8 (“when input source switching is instructed”). The control unit 11 starts the input source switching process 30. In the input source switching process 30, the control unit 11 first outputs a control signal S2a to the optical disc reproducing unit 2 to detect whether or not an optical disc is loaded in the disc drive apparatus (step 31).

  At this time, when the optical disk is not loaded, the optical disk reproducing unit 2 outputs a detection signal S2b indicating a non-mounted body to the control unit 11. In response to this, the control unit 11 determines that no optical disc is loaded in the optical disc playback unit 2 (step 32), and outputs a control signal S6 to the external signal input unit 3 to switch the input source to, for example, a digital tuner. (Step 33), and this input source switching process 30 is terminated. At this time, based on the video / audio signal Sav output from the digital tuner, the external signal input unit 3 generates the video signal Sv1 and the audio signal Sa1 and outputs them to the video processing unit 4 and the audio processing unit 6, respectively. In response to this, the video processing unit 4 generates the video signal Sv2 and outputs it to the video projection unit 5, and the audio processing unit 6 generates and outputs the audio signal Sa2 to the audio output unit 7. The video (image) of the signal Sav is displayed on the screen 12 (not shown), and the audio of the video / audio signal Sav is output from the speaker of the audio output unit 7.

  On the other hand, when an optical disk is loaded in the disk drive device, the optical disk reproducing unit 2 outputs a detection signal S2b indicating the loaded state to the control unit 11. In response to this, the control unit 11 determines that an optical disc is loaded in the optical disc playback unit 2 (step 32), and outputs a control signal S3 to the video processing unit 4 to display a predefined message. (Step 34). Specifically, in accordance with the control signal S3 from the control unit 11, the video processing unit 4 generates a video signal Sv2 for displaying a message and outputs it to the video projection unit 5. In response to this, the image projection unit 5 modulates and outputs the light from the light source lamp, and as shown in FIG. 6, “The optical disk is still in. Do you want to switch the input source? The message M2 (an example of the “third message” in the present invention) is projected onto the screen 12. By projecting this message M2, the user recognizes that the optical disk is still in the disk drive device.

  Next, the control unit 11 monitors whether or not the input source changeover switch has been operated again (step 35), monitors whether or not the optical disk has been removed from the disk drive device (steps 36 and 37), and specified in advance. The monitoring process (step 38) of whether or not the predetermined time has elapsed is repeatedly executed.

  At this time, for example, when switching the input source with the knowledge that the optical disc is mounted in the optical disc playback unit 2, the user follows the message M2 and switches the input source changeover switch ([input changeover] switch of the operation unit 9). ) Again. In response to this, the control unit 11 determines that the input source selector switch has been operated again based on the operation signal S1 output from the signal processing unit 8 (step 35), and sends the control signal S6 to the external signal input unit 3. Is output to switch the input source to, for example, a digital tuner (step 33), and the input source switching process 30 is terminated. Thereby, the switching of the input source is completed, and the video (image) based on the video / audio signal Sav from the digital tuner is displayed on the screen 12 and the audio of the video / audio signal Sav is output from the speaker.

  On the other hand, for example, when returning the optical disc that has been reproduced to the rental company, the eject switch (not shown) of the operation unit 9 is operated to take out the optical disc from the optical disc reproduction unit 2. At this time, the signal processing unit 8 generates an operation signal S1 corresponding to the operation of the eject switch according to the operation signal S0 from the operation unit 9 and outputs the operation signal S1 to the control unit 11. In response to this, the control unit 11 outputs a control signal S2a to the optical disc reproducing unit 2 to eject the optical disc and detect whether or not the optical disc has been removed from the disc drive device (step 36). At this time, when it is determined that the optical disk has been taken out based on the detection signal S2b from the optical disk reproducing unit 2 (step 37), the control unit 11 outputs the control signal S6 to the external signal input unit 3 to set the input source. For example, the digital tuner is switched (step 33), and the input source switching process 30 is terminated.

  In the projector 1, after the message M2 is displayed, a predetermined time (for example, 30 seconds) elapses without any operation of the input source changeover switch and removal of the optical disk. In addition, the input source is switched. Specifically, when a predetermined time has elapsed after the message M2 is displayed (step 38), the control unit 11 outputs a control signal S6 to the external signal input unit 3 to switch the input source to, for example, a digital tuner ( Step 33), the input source switching process 30 is terminated. Thereby, the switching of the input source is completed, and the video (image) based on the video / audio signal Sav from the digital tuner is displayed on the screen 12 and the audio of the video / audio signal Sav is output from the speaker.

  When the power of the projector 1 is shut off during reproduction of the optical disc by the optical disc reproduction unit 2 or display of video (image) based on the video / audio signal Sav from the digital tuner (external device), the control unit 11 executes the power-off process 40 shown in FIG. Specifically, when the power switch of the operation unit 9 is operated and an operation signal S1 corresponding to the switch operation is output from the signal processing unit 8 (an example of “when power-off is instructed”). The control unit 11 starts the power shutdown process 40. In the power shut-off process 40, the control unit 11 first outputs a control signal S2a to the optical disc reproducing unit 2 to detect whether or not an optical disc is loaded in the disc drive apparatus (step 41).

  At this time, when the optical disk is not loaded, the optical disk reproducing unit 2 outputs a detection signal S2b indicating a non-mounted state to the control unit 11. In response to this, the control unit 11 determines that no optical disc is loaded in the optical disc playback unit 2 (step 42), and outputs a control signal S4 to the video projection unit 5 to start the cool-down process (step step). 43). In response to this, the image projection unit 5 turns off the light source lamp. Next, the control unit 11 outputs a control signal S5 to the power supply unit 10 (controls the power supply unit 10) when a predetermined time has elapsed since the start of the cooldown process (when the cooldown process is completed). The power supply to each part of the projector 1 is stopped (step 44). Thereby, the power-off process of the projector 1 is completed.

  On the other hand, when an optical disk is loaded in the disk drive device, the optical disk reproducing unit 2 outputs a detection signal S2b indicating the loaded state to the control unit 11. In response to this, the control unit 11 determines that an optical disc is loaded in the optical disc playback unit 2 (step 42), and outputs a control signal S3 to the video processing unit 4 to display a predefined message. (Step 45). Specifically, the video processing unit 4 generates a video signal Sv2 for displaying a message according to the control signal S3 from the control unit 11, and outputs the video signal Sv2 to the video projection unit 5. In response to this, the image projection unit 5 modulates and outputs the light from the light source lamp, and as shown in FIG. 7, “The optical disk is still in. Do you want to turn off the power? The message M3 (an example of “first message” in the present invention) is projected onto the screen 12. By projecting this message M3, the user recognizes that the optical disk is still in the disk drive device.

  Next, the control unit 11 monitors whether or not the power switch has been operated again (step 46), monitors whether or not the optical disk has been removed from the disk drive device (steps 47 and 48), and a predetermined predetermined value. The monitoring process (step 49) of whether or not the time has elapsed is repeatedly executed.

  At this time, for example, when the reproduction of the optical disk is resumed later only by temporarily interrupting the reproduction of the optical disk, the user operates the power switch of the operation unit 9 again according to the message M3. At this time, the control unit 11 determines that the power switch is operated again based on the operation signal S1 output from the signal processing unit 8 (step 46), and outputs the control signal S4 to the video projection unit 5. Then, the cool-down process is started (step 43), and when a predetermined time has elapsed, the control signal S5 is output to the power supply unit 10 to stop the supply of power to each unit of the projector 1 (step 44). Thereby, the power-off process of the projector 1 is completed.

  On the other hand, for example, when it is necessary to return the optical disc that has been reproduced to the rental company, the optical disc is taken out from the optical disc reproducing unit 2 by operating an eject switch (not shown) of the operation unit 9. At this time, the signal processing unit 8 generates an operation signal S1 corresponding to the operation of the eject switch in response to the operation signal S0 from the operation unit 9, and outputs the operation signal S1 to the control unit 11. In response to this, the control unit 11 outputs a control signal S2a to the optical disc reproducing unit 2 to eject the optical disc and detect whether or not the optical disc has been taken out from the disc drive device (step 47). At this time, when it is determined that the optical disk has been taken out based on the detection signal S2b from the optical disk reproducing unit 2 (step 48), the control unit 11 outputs a control signal S4 to the video projection unit 5 and performs a cool-down process. At the same time, the control signal S5 is output to the power supply unit 10 to stop the supply of power to each unit of the projector 1 (step 44). Thereby, the power-off process of the projector 1 is completed.

  Further, in the projector 1, when the predetermined time (for example, 1 minute) elapses after neither the operation of the power switch nor the removal of the optical disk is performed after the message M3 is displayed, Is cut off. Specifically, when a predetermined time has elapsed after the message M3 is displayed (step 49), the control unit 11 outputs a control signal S4 to the video projection unit 5 to start the cool-down process (step 43). When a predetermined time has elapsed, a control signal S5 is output to the power supply unit 10 to stop the supply of power to each unit of the projector 1 (step 44). Thereby, the power-off process of the projector 1 is completed.

  As described above, in the projector 1 and its power control method, when the control unit 11 is instructed to turn off the power (when the operation signal S1 instructing to turn off the power is output), the optical disc playback unit 2 performs the recording of the optical disc. When the unmounted state is detected, the power supply unit 10 is controlled to stop the supply of power, and when the mounted state of the optical disk is detected, a message M3 (first message notifying that the optical disk is mounted) Is displayed on the screen 12 by the video projection unit 5 and when the non-mounted state of the optical disk is detected thereafter, the power supply unit 10 is controlled to stop the supply of power. Therefore, according to this projector 1 and its power supply control method, not only the user can recognize that the optical disk is still mounted by displaying the message M3, but also the power supply regardless of the operation of the power switch. By the operation of the projector 1 that is not blocked, the user can be surely recognized that the optical disk is still mounted. Further, according to the projector 1 and its power control method, when the user determines that the optical disk needs to be taken out, the power is not shut off, so the apparatus needs to be turned on again to take out the optical disk. Unlike some conventional alarm mechanisms, the optical disk can be removed quickly and easily.

  Further, according to the projector 1, after the control unit 11 displays the message M3, when the optical disc playback unit 2 is instructed to turn off the power again in a state where the optical disc mounting state is continuously detected ( When the operation signal S1 for instructing power-off is output again), the power supply unit 10 is controlled to stop the supply of power, so that when the user determines that there is no need to remove the optical disk, The power can be shut off immediately by re-operating the switch. For this reason, according to the projector 1, it is possible to avoid a situation where power is unnecessarily consumed as compared with the configuration in which the power is turned on even when it is not necessary to take out the optical disk. it can.

  Further, according to the projector 1, the control unit 11 controls the power supply unit 10 to start the supply of power when the power-on is instructed (when the operation signal S1 instructing power-on is output). At the same time, when the optical disk playback unit 2 detects the mounting state of the optical disk, a message M1 (second message) for notifying that the optical disk is mounted is displayed on the screen 12 by the video projection unit 5, for example. Even if you forget to remove the optical disk when the power is turned off, the message M1 is displayed when the power is turned on, so that the user can be sure that the optical disk is still installed. Can be made.

  In addition, according to the projector 1, when the control unit 11 is instructed to switch the input source (when the operation signal S1 instructing switching of the input source is output), the optical disk playback unit 2 mounts the optical disk. Is detected, a message M2 (third message) for notifying that the optical disk is mounted is displayed on the screen 12 by the video projection unit 5, so that the optical disk is still mounted. Is displayed to the user by the operation of the projector 1 that the input source is not switched even though the input source changeover switch is operated. It can be surely recognized that the state remains.

  Furthermore, according to the projector 1, the image display device according to the present invention and the video projection unit 5 (projection mechanism) as the display unit according to the present invention are provided, so that the power supply can be turned off to take out the optical disk. Since it does not need to be turned on, the number of times of lighting of the light source lamp or the like can be sufficiently reduced. For this reason, according to this projector 1, the lifetime of a light source lamp etc. can be extended.

  In addition, this invention is not limited to said structure. For example, although an optical disk has been described as an example of the information medium in the present invention, the information medium on which an image (video) is displayed by the image display device according to the present invention is not limited to the optical disk, and a magnetic tape cartridge This includes various types of information media such as and removable memory. Further, the example in which the power-on process 20 is executed when the power is turned on by operating the power switch of the operation unit 9 and the example in which the power-off process 40 is executed when the power is shut down by operating the power switch have been described. For example, in an image display device having a timer function, the power-on process 20 is executed when power is turned on at a set time, or the power-off process 40 is executed when the power is turned off at a set time. Can be adopted. In such a configuration, the output of a signal (a signal for notifying the arrival of the set time) from the timer corresponds to “instruction to power off or power on” in the present invention.

  Although the projector 1 provided with the liquid crystal light valve has been described as an example, the projector 1 can be configured by employing a light modulation element such as DMD (Digital Micromirror Device) instead of the liquid crystal light valve. DMD is a trademark of Texas Instruments Incorporated. In this case, when a liquid crystal light valve is employed as the light modulation element, the liquid crystal light valve is not limited to a transmissive liquid crystal light valve, and a reflective liquid crystal light valve can be employed.

2 is a block diagram illustrating a configuration of a projector 1. FIG. 4 is a flowchart of power-on processing 20. It is a display screen figure in the state where message M1 was displayed on screen 12. FIG. 4 is a flowchart of an input source switching process 30. 5 is a flowchart of a power shutdown process 40. It is a display screen figure in the state where message M2 was displayed on screen 12. It is a display screen figure in the state where message M3 was displayed on screen 12.

Explanation of symbols

  1 projector, 2 optical disc playback unit, 3 external signal input unit, 4 video processing unit, 5 video projection unit, 10 power supply unit, 11 control unit, 12 screen, 20 power-on process, 30 input source switching process, 40 power-off process M1-M3 message, S0, S1 operation signal, S2a control signal, S2b detection signal, S3-S6 control signal, Sa1, Sa2 audio signal, Sav video audio signal, Sv1, Sv2 video signal

Claims (6)

A medium reproducing unit configured to detect whether or not an information medium is mounted and executing reproduction processing on the mounted information medium and outputting image data, a power supply unit, and controlling the power supply unit and the output An image display device comprising: a control unit that displays an image based on the image data on the display unit;
The control unit controls the power supply unit to stop the supply of power when the medium reproduction unit detects that the information medium is not attached when the power-off is instructed, and the medium reproduction is performed. When the mounting state of the information medium is detected by the unit, a first message notifying that the information medium is mounted is displayed on the display unit, and then the medium reproducing unit An image display device that controls the power supply unit to stop the supply of power when a non-mounted state is detected.   The control unit displays the first message on the display unit and then instructs the power-off again in a state in which the medium reproducing unit continuously detects the mounted state of the information medium. The image display device according to claim 1, wherein the power supply unit is controlled to stop the supply of the power.   The control unit controls the power supply unit when power on is instructed to start the supply of power, and when the medium reproducing unit detects the mounting state of the information medium, the information medium The image display device according to claim 1, wherein a second message notifying that the device is attached is displayed on the display unit.   When the medium playback unit detects that the information medium is mounted when switching of the input source is instructed, the control unit displays a third message notifying that the information medium is mounted. The image display device according to claim 1, wherein the image display device is displayed on the display unit.   A projector comprising the image display device according to claim 1 and a projection mechanism as the display unit. Power supply control for controlling a power supply unit of an image display device that includes a medium reproduction unit that executes reproduction processing on the mounted information medium and outputs image data, and is configured to display an image based on the image data on the display unit A method,
When the medium playback unit detects that the information medium is not mounted when power-off is instructed, the power supply unit is controlled to stop the supply of power, and the medium playback unit When the mounting state is detected, a first message notifying that the information medium is mounted is displayed on the display unit, and then the non-mounting state of the information medium is detected by the medium reproducing unit. A power supply control method for controlling the power supply unit to stop the supply of the power supply when the power is supplied.

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