JPH09304727A - Optical sight device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow an external environment to be instantly viewed by erasing a video and/or a sound and making a screen see-through at the same time when muting operation is executed. SOLUTION: When a sight position becomes proper after a head mounted type display (HMD) device 1 is attached and the position of an optical sight device main body 2 is adjusted, the screen on which a vertical line and a horizontal line are crossed and displayed is displayed. When the position of the sight sense is not proper, the screen on which the vertical line and the horizontal line are not crossed is displayed, for example. When a muting switch 9 is depressed in the midst of the display of this check screen, an optical sight part becomes see-through and an outside scene appears. Besides, only the character of 'AV muting' is displayed. When the sight position is judged to be proper on the check screen, a confirmation switch 8 is depressed and the next screen is displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical visual device, and more particularly, to an optical visual device such as a head mounted display (HMD) device having a function of interrupting an image displayed by being mounted in front of the face.

[0002]

[Prior art]

In the conventional optical visual apparatus, for example, an image such as a video image or a television image displayed on a pair of color liquid crystal panels in a state of being mounted on the face is magnified and viewed through a pair of eyepieces. An optical vision device has been proposed.

The display of this optical visual device includes a backlight, a transmissive liquid crystal display element illuminated by the backlight, a reflecting mirror for reflecting an image projected on the liquid crystal display element to the eyepiece side. It has a built-in casing-type lens barrel, and the image projected on the liquid crystal display element by irradiation of the backlight of the lens barrel is enlarged by the eyepieces and projected on the retinas of the left and right eyes.

Such optical vision devices include those worn by the user on the head and those worn by the user like spectacles, both of which project an image near the front of the face. It is a thing.

Since such an optical visual device projects an image in the immediate vicinity of the eyes, it is impossible to see the external scenery when looking at the screen, and when seeing the external scenery, the power switch is turned on. The image density is adjusted by cutting or using an adjusting means such as a density adjusting knob.

[0007]

However, in the prior art, even if a suspending operation such as mute is performed, only the sound is erased and the image remains displayed, or even if the sound and the image are erased, If you do not
There is a problem that you cannot see the outside world. In addition, since the video signal and the audio signal are still output while watching the external scenery, there is a problem that the video is interrupted.

Therefore, there is a problem to be solved in the processing of video and audio and the control of the image state when the interruption operation such as the mute is performed.

[0009]

In order to solve the above-mentioned problems, an optical visual system according to the present invention comprises an optical visual part for displaying an image on a screen located in the anterior eye, and this optical visual part is provided in front of the face. An optical visual device equipped with a mounting part that supports the image display and a control part for displaying an image, and this control part interrupts the display of the image when the mute operation is performed to put the screen into a see-through state. Is.

With the above structure, when the mute operation is performed, the video and audio are interrupted, and the screen is set to the see-through state, so that the blocked state in front of the eyes can be avoided.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a head mounted display (HMD) which is an embodiment of an optical visual device according to the present invention.
The device 1 will be described in detail with reference to the drawings.

As shown in FIG. 1, the HMD device 1 includes an optical visual main body 2 and a first remote controller 6 connected to the optical visual main body 2 via a first connecting cord 17.
And a second remote controller 12 connected to the first remote controller 6 via a second connection cord 18, and the electrical connection state thereof is described with reference to FIG. explain.

The optical vision main body 2 comprises a head mount portion 3 which is a mounting portion and an optical vision portion 4, and the optical vision portion 4 is connected to the head mount portion 3 via a connecting portion 5. The head mount portion 3 is formed so as to be attachable to a human head, and when the head mount portion 3 is attached to the head, the optical visual part 4 is arranged in front of the face.

The optical visual part 4 is formed symmetrically corresponding to both eyes, and is configured so that an image can be viewed as one image by the left and right eyes. It has a structure protected by 4A.

The eyeball side of the optical visual part 4 protected by the front cover 4A is, as shown in FIG.
When wearing on the head, the liquid crystal display 4
It has a structure with B.

As shown in FIG. 3, the liquid crystal display section 4B includes left and right fluorescent lamps 23R and 23L which are light sources, LCDs 22R and 22L which are liquid crystal screens, and an LCD driving section 30R which sends a video signal to the LCDs 22R and 22L. It is composed of 30L.

The first remote controller 6 is arranged at a substantially central position of the connection cords 17 and 18 and has a positional relationship that is easy to operate by hand. The earphone 7 is detachably attached to the first remote controller 6 for operating the image for viewing. A confirmation switch 8 for instructing to continue, a mute switch 9 for switching the optical visual part 4 between a state where the external scenery is visible (see-through) and a screen display state, a density adjustment knob 10 for adjusting the image density of the optical visual part 4, A volume control knob 11 for adjusting the volume of the earphone 7 is provided.

As shown in FIG. 3, the confirmation switch 8, the mute switch 9 and the density adjustment knob 10 are control keys for controlling the image display of the LCDs 22R and 22L of the liquid crystal display section 4B, and control signals from these switches. Is sent to the LCD drive units 30R and 30L. The volume knob 11 adjusts the volume of the headphones 7 by adjusting the volume adjuster 31.

When the mute switch 9 is pressed when the screen is displayed, the optical visualizing section 4 is instantly brought into a state where the external scenery can be seen (see-through), and when the predetermined screen is displayed, the screen display is stopped, From the AV equipment that is the signal source to the HM
When the video signal and the audio signal are output to the D device 1, the output is stopped. Then, when the mute switch 9 is pressed again, the optical visual section 4 is returned to the screen displayable state, and when the display of the predetermined screen is stopped, the predetermined screen is displayed again, and the video signal and the audio signal are output. When is stopped, the output is restarted to obtain continuous video and audio. In addition, when the mute switch 9 is pressed and left for a predetermined time, for example, 8 minutes, the power switch 13 is automatically turned off to save power.

The second remote controller 12 is of a so-called mount type, and its external structure is, as shown in FIG. 1, provided with a power switch 13 and a numeral key 14 for inputting a password, and on the back side. Reset switch 19
Is provided. A battery 15 for supplying power is attached to the second remote controller 12, and an AV connection cable 16 for inputting a video signal and an audio signal from an AV device (not shown) is connected to the second remote controller 12.

The internal configuration of the second remote controller 12 having this external configuration is, as shown in FIG. 4, fluorescent lamps 23R, 23L, LCDs 22R, 22L of the liquid crystal display section 4B.
And a power supply circuit 32 for supplying power to each circuit by turning on / off the power switch 13, and an LCD of the liquid crystal display unit 4B
Control unit 3 that controls the drive units 30R and 30L and each circuit
3, a character generator 34 that generates a character signal for displaying characters and the like, and an AV connection cable 16 to process a video signal from an AV device (not shown) that is a signal generation source and output a predetermined video signal. A video signal processing circuit 35, an audio signal processing circuit 36 which similarly processes an audio signal from an AV device and outputs a predetermined audio signal to the audio controller 31 of the first remote controller 6, and an output from the character generator 34. An adder 37 is provided which superimposes the character signal and the video signal output from the video signal processing circuit 35 and outputs the result to the LCD drive units 30R and 30L of the liquid crystal display unit 4B. The control unit 33 has software functions such as a warning screen display control described later, a check screen, and password input / output.

Next, among the functions of the HDM apparatus 1 having such a configuration, particularly the mute function will be described with reference to the flowchart.

First, as shown in FIG. 4, the power switch 1
3 (see FIG. 1) is turned on, the power supply circuit 3 shown in FIG.
2 to control unit 33, video signal processing circuit 35, audio processing circuit 36, LCD driving units 30R and 30L, LCD22R,
22L, fluorescent lamps 23R, 23L, etc. are supplied with power (step ST1).

When power is supplied to the control unit 33, a first warning screen 33a is displayed (step ST2).

As shown in FIG. 8, the first warning screen 33a is a blue back screen in which images and sounds are muted, and a warning message to confirm the mounting position and "*" at the four corners of the screen. The mark 24 such as is displayed in white. HMD device 1
Adjust the mounting position of the and mark "*" on the four corners of the screen.
If 4 is displayed, it can be determined that the HMD device 1 is properly mounted, and if the confirmation switch 8 (see FIG. 1) is pressed within a predetermined time, for example, within 2 minutes, the next screen is displayed. If the mark 24 of "*" is not displayed at the four corners of the screen 33a, the HMD device 1 is not properly mounted and may affect the human body. Therefore, if the confirmation switch 8 is not pressed, After a lapse of a predetermined time, the power supply is automatically turned off (step ST3).

When the mute switch 9 is pressed while the first warning screen 33a is displayed, the optical visual part 4 is in a see-through state, and as shown in FIG. 33t appears and only the character "AV mute" 44 is displayed. When the reset switch 19 is pressed, the password is initialized on a memory (not shown), but nothing is displayed on the screen.

If the confirmation switch 8 is pressed within a predetermined time after the first warning screen 33a is displayed, the second warning screen is displayed (step ST4). This second warning screen 3
As shown in FIG. 9, 3b and 33c are blue-backed screens in which images and sounds are muted, and warning messages for preventing the influence on the human body are displayed in white. The second warning screen 33b is, as shown in FIG. 9 (a), a warning for limiting the use of minors and the use of people who have abnormal eyes, and by pressing the confirmation switch 8. The next second warning screen 33c is displayed. Next second warning screen 33c
As shown in FIG. 9B, a warning message for limiting long-term use is displayed, and a warning message for preventing the influence on the human body is displayed.

When the mute switch 9 is pressed while the second warning screens 33b and 33c are displayed, the optical visual part 4 is in the see-through state, and FIG.
As shown in (b), the external scenery 33t appears and only the character 44 of "AV mute" is displayed. When the reset switch 19 is pressed, the password is initialized on a memory (not shown), but nothing is displayed on the screen.

Then, when the user does not feel any abnormality in the eyes, tiredness of the eyes, etc., the confirmation switch 8 can be pushed within a predetermined time, for example within 2 minutes, to advance the screen display to the next screen. After the predetermined time has passed without pressing the confirmation switch 8, it is determined that the time-out has occurred and the power is automatically turned off (step ST5).

Second warning screen 33 for eye abnormality, fatigue, etc.
If b and 33c are confirmed and the confirmation switch 8 is pressed within a predetermined time, a notice screen 33d for notifying the check screen is displayed as shown in FIG. 10 (step ST6). As shown in FIG. 10, the notification screen 33d is a blue-back screen in which images and sounds are muted, and a notification text for notifying that a check for preventing visual impairment or the like is performed on the next screen is displayed in white. To do.

When the mute switch 9 is pressed while the notification screen 33d is displayed, the optical visual part 4 is in the see-through state, and the external scenery 33t appears as shown in FIG. Only the character 44 of "" is displayed.

Then, after confirming the announcement, within a predetermined time,
For example, if the confirmation switch 8 is pressed within 2 minutes,
As shown in, check screens 33e and 33f are displayed (step ST7). If the confirmation switch 8 is not pressed, it is determined that a time-out has occurred after a predetermined time has elapsed, and the power is automatically turned off (step ST8).

The check screens 33e and 33f are screens for checking whether or not the viewing position of the HMD device 1 and the position of the eyeball are appropriately determined. As shown in FIG. At the position, one horizontal line 40 in the horizontal direction and two vertical lines 41 in the vertical direction are displayed in white, which is a black back screen 33e. The LCDs 22R and 22L of the liquid crystal visual part 4B of the HMD device 1 are displayed so that the horizontal line 40 is seen by the left eye and the vertical line 41 is seen by the right eye.

The HMD device 1 is attached to the optical vision main body 2
If the visual position is adjusted, the position of
As shown in (a), the horizontal line 40 and the vertical line 41 intersect vertically to form a screen 33e. If the visual position is not appropriate, for example, as shown in FIG.
The screen 33f is one in which 0 and the vertical line 41 do not intersect vertically.

When the mute switch 9 is pressed while the check screens 33e and 33f are displayed, the optical visual part 4 is in a see-through state, and the external scenery 33t appears as shown in FIG. Only the character 44 of is displayed.

When it is determined that the visual position is appropriate on the check screens 33e and 33f, the confirmation switch 8 is pressed to display the next screen. If the confirmation switch 8 is left untouched, the power is automatically turned off after a predetermined time, for example, 2 minutes, is judged to have timed out (step ST9).

Notification screen 33d shown in FIG. 10 (step S
(T6) and the check screens 33e and 33f (step ST7) shown in FIG. 11 are displayed, even if the reset switch 19 is pressed, the password is initialized in the memory (not shown). Is also not displayed.

Check screens 33e and 33f shown in FIG.
When the confirmation switch 8 is pressed after confirming that the visual position is appropriate, it is determined whether or not the password has been decided (step ST10).

When the password is determined, as shown in FIG. 5, it is determined whether or not the password needs to be checked (step ST11).

When the password check is unnecessary, image display is started on the LCDs 22R and 22L (see FIG. 3) as shown in FIG. 6 (step ST23).

When the password check is required, the screen 33g requesting the password input shown in FIG. 12 is displayed (step ST12). This screen 33g is a blue-back screen in which the image and sound are muted, and is displayed in white with "Please enter password".

When the mute switch 9 is pressed while the password input request screen 33g is displayed, the optical visual part 4 is in the see-through state, and as shown in FIG. 21, only the character 44 of "AV mute" is displayed. Is superimposed on the external landscape. When the reset switch 19 is pressed, the password is initialized and the first warning screen 33 shown in FIG. 8 is displayed.
Return to a (step ST2).

If no input is made within a predetermined time, for example, two minutes after the password input request screen 33g is displayed, it is determined that the time-out has occurred and the power is automatically turned off (step ST13).

When the password is entered within the predetermined time (step ST14), it is determined whether the entered password matches the registered password (step ST15).

If the entered password and the password match, video display is started (step ST23).

In the case of so-called "NG", in which the entered password does not match the registered password, the number of "N"
If it is "NG" (step ST16), if it is "NG" for the first to fourth times, a screen 33h (see FIG. 13) requesting re-input of the password is displayed (step ST17).
Prompt for password again. The password re-entry request screen is also a blue-back screen in which the image and sound are muted, and is displayed in white saying "Password is incorrect. Please re-enter".

This password input request screen 33g, 3
When the mute switch 9 is pressed while displaying 3h, the optical visual part 4 is in the see-through state,
As shown in FIG. 21B, the external scenery 33t appears and "A
Only the character 44 of "V mute" is displayed. When the reset switch 19 is pressed, the registered password is initialized and the first warning display screen 3 shown in FIG. 8 is displayed.
Return to 3a.

If no input is made within a predetermined time, for example, 2 minutes, after the password re-input request screen 33h is displayed, it is determined that a timeout has occurred and the power is automatically turned off (step ST18).

When the password is input again within a predetermined time when the password is re-input (step ST14), it is determined whether the input password and the registered password match (step ST15).

If the re-entered password matches the registered password, image display is started (step ST2).
3).

If the entered password is "NG" for the fifth time, the Caution screen 33j shown in FIG. 14 is displayed (step ST17). This screen is a blue back screen in which the video and sound are muted, and the text "The password is wrong, please refer to the instruction manual" is displayed in white.

When the mute switch 9 is pressed when the caution screen 33j is displayed, the optical visual part 4 is in the see-through state, and the external scenery 33t appears and "AV mute" is displayed, as shown in FIG. Character 44
Only displayed. When the reset switch 19 is pressed, the registered password is initialized, but the screen does not change and nothing is displayed.

The power is automatically turned off after a predetermined time, for example, 10 seconds, from the display of the caution screen 33j (step ST19).

On the other hand, when the password is not decided yet, as shown in FIG. 6, a screen 33k (see FIG. 15) for confirming whether or not the password needs to be registered is displayed (step ST20). On this screen 33k, "Please register the password with the number buttons, if not required, press [Confirm]" is displayed in white.

At this time, if the mute switch 9 is pressed,
The optical visual part 4 is in the see-through state, and FIG.
As shown in, external scenery 33t appears and "AV mute"
Only the character 44 of is displayed. Also, reset switch 1
If 9 is pressed, the same screen 33k (see FIG. 15) is displayed again, and if no input is made, that is, no password is registered and the confirmation switch 8 is not pressed, after a predetermined time elapses, for example, 2 After a lapse of minutes, it is determined that the time-out has occurred and the power is automatically turned off (step ST21).

If the password registration is not necessary, the confirmation switch 8 is pressed to register that the password is not needed (step ST22), and video display is started (step ST23).

When registering the password, if the user inputs the desired digit of the password with the numeric keys 14 (step ST24), the number confirmation screen 33 is displayed as shown in FIG.
Switch to m (step ST25). Number confirmation screen 3
When confirming the password entered at 3 m and registering the entered password, the confirmation switch 8 is pressed to register (step ST26). To correct the entered password, the password is entered again before the confirmation switch 8 is pressed (step ST24).

When the number confirmation screen 33m is displayed (step ST27), the mute switch 9 is pressed,
The optical visual part 4 is in the see-through state, and as shown in FIG. 21, the external scenery 33t appears and only the character 44 of "AV mute" is displayed. When the reset switch is pressed, a screen 33g for confirming necessity / unnecessity of password registration shown in FIG. 12 is displayed (step ST20). If nothing is input, that is, the password is not re-input, and the confirmation switch 8 is displayed. If neither the reset switch 19 is pressed, a predetermined time elapses, for example, two minutes elapses, and then a time-out is determined and the power is automatically turned off (step ST2).
7). At the time of password input, if the password is not continuously input, for example, if the second digit is not input even after a predetermined time elapses after the input of the first digit, the power is automatically turned off (step ST29). .

When the password is registered (step ST26), image display is started (step ST23),
Start counting video time. When the mute switch 9 is pressed during the image display, the optical visual part 4 is in the see-through state, and the output of the image signal and the audio signal from the AV device or the like as the signal source to the HMD device 1 is stopped. When the mute switch 9 is pressed again, the optical visual device 4 returns to the state before the mute switch 9 is pressed, that is, the screen display is possible, and the output of the video signal and the audio signal from the AV device or the like to the HMD device 1. Restarts, and continuous video and audio can be obtained. When the video signal and the audio signal are not input to the HMD device 1, the counting of the video time is also stopped.

After 2 hours or more, for example, 2 hours and 15 minutes have elapsed from the start of displaying the image, a screen 33n for calling attention is displayed as shown in FIG. 17 (step ST2).
8). The display of this screen 33n superimposes (imposes) the text "Two hours or more have passed, please rest if you feel tired" in white on the image, and at this time, the sound is not muted.

When the reset button 19 is pressed while the screen 33n for calling attention is displayed, the password is initialized, and the screen returns to the screen for confirming the necessity / unnecessity of password registration shown in FIG. 12 (step ST20). .

At this point, when the user is not feeling tired, the confirmation switch 8 is pressed to continue the image display.
If you feel tired, leave the confirmation switch 8 untouched and leave it for a predetermined time, for example, 2 minutes.
The power is automatically turned off upon judgment of time-out (step ST29).

Then, after 4 hours or more, for example, 4 hours and 15 minutes have elapsed from the start of displaying the image, a screen 33p for calling attention is displayed as shown in FIG. 18 (step ST
30). The display on this screen 33p superimposes (imposes) the text "4 hours or more have passed, if you feel tired, please rest" on the image (impose), and the sound is not muted at this time.

When the reset button 19 is pressed while the screen 33p for calling attention is displayed, the password is initialized, and the screen returns to the screen 33g for confirming the necessity / unnecessity of password registration shown in FIG. 12 (step ST20). ).

At this point, if you are not feeling tired,
The confirmation switch 8 is pressed to continue the image display. If the user feels tired, if the user leaves the confirmation switch 8 untouched, the power is automatically turned off after a predetermined time has elapsed, for example, 2 minutes, and it is determined that a time-out has occurred (step S).
T31).

When the video display is continued for 6 hours, the screen 33q including the warning text is displayed as shown in FIG.
Is displayed (step ST32). On the screen 33q consisting of this warning, the text "I have passed for 6 hours, please stop using it as it may damage your health will soon be turned off" is superimposed on the image in white (imposed) Is displayed for a predetermined time, for example, 20 seconds without being muted.

After 20 seconds have passed, the video and sound are automatically muted to form a blue back screen (step ST33). After a predetermined time has passed since the blue back screen was displayed, for example, 10 seconds have passed, The power is automatically turned off (step ST34).

When the reset switch 19 is pressed while the screen 33q including the warning text is displayed (steps ST32 and ST33), the registered password is initialized, but nothing is displayed on the screen. There is no need to switch screens.

After the power is turned on (step ST1),
When the battery 15 is exhausted, a caution screen 33r is displayed as shown in FIG. 20, even during the operation. This screen 33r is displayed in white as "The battery has run out, please replace the battery." This screen 33r is also a blue-back screen in which video and sound are muted. The power is turned off after a predetermined time, for example, 5 seconds, after the screen 33r is displayed.

When the remaining amount of the battery 15 is confirmed during the operation, if a battery remaining amount display key (not shown) is pressed, a screen 33s showing the remaining amount of the battery 15 is displayed as shown in FIG. . In this screen 33s,
Battery pattern 42 showing the remaining battery level, and / or
An outlet pattern 43 indicating that power is being supplied using an outlet is displayed in white, and a blue back screen in which images and sounds are muted is displayed. This battery remaining amount display screen 33s is displayed after a predetermined time has passed,
For example, it disappears automatically after 5 seconds and returns to the original screen. If the confirmation switch 8 is pressed within a predetermined time, the original screen is forcibly returned.

When there is no signal, for example, when there is no video signal or signal from the character generator 34,
The screen is black back and nothing is displayed.

Incidentally, in the above-mentioned embodiment, the operation relating to the password (step ST11 excluding step ST23)
Up to step ST27), the screen display is started (step ST23). However, these operations are omitted and the warning display and the visual position are checked (steps ST1 to ST1).
The video display may be started by performing only step ST9). Further, the display of the screen showing the passage of time (steps ST30 to ST36) may be omitted.

[0073]

As described above, in the optical visual device according to the present invention, when the mute operation is performed, the image and / or the sound can be erased, and at the same time, the screen can be in the see-through state. Even if you are watching the image without knowing the state of, you can instantly see the state of the outside world.

[Brief description of drawings]

FIG. 1 is an overall perspective view of an optical visual device according to an embodiment of the present invention.

FIG. 2 is a side view showing a mounted state of the optical visual device.

FIG. 3 is a circuit block diagram of the optical visual device.

FIG. 4 is a flowchart until the image display of the optical visual device is started.

FIG. 5 is a flowchart showing a password check of the optical visual device.

FIG. 6 is a flowchart showing registration of a password of the optical visual device.

FIG. 7 is a flowchart after the image display of the optical visual device.

FIG. 8 is a first warning screen for mounting the optical visual device.

FIG. 9 is a second warning screen regarding the effect of the optical visual device on the human body.

FIG. 10 is a warning screen for visual position adjustment of the optical visual device.

FIG. 11 is a check screen for adjusting the visual position of the optical visual device.

FIG. 12 is a password input request screen of the optical visual device.

FIG. 13 is a password re-entry request screen of the optical visual device.

FIG. 14 is a screen of Caution of the optical visual device.

FIG. 15 is a password registration request screen of the optical visual device.

FIG. 16 is a password registration confirmation screen of the optical visual device.

FIG. 17 is a screen for calling attention to the long-term use of the optical visual device.

FIG. 18 is a screen for calling attention to the long-term use of the optical visual device.

FIG. 19 is a warning screen for long-term use of the optical visual device.

FIG. 20 is a caution screen showing that the battery of the optical visual device is low.

FIG. 21 is a screen showing an AV mute state and a battery remaining amount of the optical visual device.

[Explanation of symbols]

1 HMD device 2 Optical vision main body 3 Head mount section 4 Optical vision section 4A Front cover 4B Liquid crystal display section 5 Connecting section 6 First remote controller 7 Headphones 8
Confirmation switch 9 Mute switch 10 Density adjustment knob 11
Volume control knob 12 Second remote controller 13 Power switch 14 Numeric keys 15 Battery 16 AV connection cable 17 First connection cord 18 Second connection cord 19 Reset switch 22R, 22L Liquid crystal display (LCD) 23R, 23
L fluorescent lamp 24 mark 30R, 30L LCD drive unit 31
Volume controller 32 Power supply circuit 33 Control unit 34 Character generator 35 Video signal processing circuit 36 Audio signal processing circuit 3
7 Adder 40 Horizontal line 41 Vertical line 42 Battery mark 43
Outlet mark

Claims (3)

[Claims] 1. An optical visual system comprising: an optical visual unit for displaying an image on a screen located in front of the eye; a mounting unit for supporting the optical visual unit in front of the face; and a control unit for controlling the display of the image. The apparatus is an optical visual device, wherein the control unit includes a suspending unit that suspends the display of the image and puts the screen in a see-through state when a mute operation is performed. 2. The optical visual device according to claim 1, wherein the interruption means interrupts the display of the image and the output of the sound at the same time. 3. The optical visual device according to claim 1, wherein the interruption means automatically turns off the power after a predetermined time has elapsed.