JPH0736010A - Head or face attaching type display device with see-through function - Google Patents

Abstract

PURPOSE:To provide a head or face attaching type display device to which an effective see-through function is imparted. CONSTITUTION:By overlapping plural shutter plate members 31 and 32 provided with light transmitting parts 31a and 32a and light shielding parts 31b and 32b at prescribed intervals, differently moving one shutter plate member with respect to the other shutter plate member and aligning the respective light transmitting parts 31a and 32a, a light transmitting state is attained. By preventing them from being aligned, a light shielding state is attained. Besides, the light transmitting state is attained by overlapping plural polarizing plate members provided with polarizing parts whose axes of polarization are orthogonally crossed to each other at the prescribed intervals, differently moving one polarizing plate member with respect to the other polarizing plate member and aligning the axes of polarization of the respective polarizing parts. By preventing them from being aligned, the light shielding state is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device having a see-through function for enlarging and projecting an observation image, and more particularly, a head having a see-through function to be used while being mounted and held on the observer's head or face. Alternatively, the present invention relates to a face-mounted display device.

[0002]

2. Description of the Related Art In recent years,
By directly projecting an image obtained from a small CRT or an image display device such as a liquid crystal display display device onto an eyeball of an observer by an eyepiece optical system, the image may be magnified and projected in the air. There has been developed a video display device that enables observation of various virtual images, that is, a display device that is detachably attached to an observer's head or face for use.

The head- or face-mounted display device is classified into a goggle type shown in FIG. 12 and a helmet type shown in FIG. That is, in the former goggle type, the display device 1 having an outer appearance formed in a goggle shape is used by the headband 2 mounted on the head so as to cover the left and right eyeballs of the observer, and In the latter helmet type, the display device 1 is used instead of the glasses of the helmet 3.
Is tilted up and down, and in the state where the helmet 3 is worn on the head, the display device 1 is similarly used so as to cover the left and right eyeballs. With this head- or face-mounted display device, for example, a video image, a television image, or the like can be directly projected onto the left and right eyeballs, and a powerful image on a large screen can be freely enjoyed.
On the other hand, in the case of a display device having such a configuration, for an observer who uses the display device, that is, an observer who is wearing the display device on his or her head and is observing an image, the left and right eye parts are both It can be said that it is very dangerous when considering the surrounding environment because it is covered and the external situation is completely shielded from the view.

Therefore, in the head- or face-mounted display device having such a structure, for example, it is possible to easily observe and grasp the external situation only by a simple operation of a switch or the like. That is, it is essential to add a so-called see-through function. As a simple method for this, a small shutter means, that is, a shutter with a see-through function, which can easily introduce an external image into the field of view of the head- or face-mounted display device, if necessary. It is desirable to have means attached.

First, as a shutter means of this kind, it is possible to easily consider a reciprocating-type light-shielding mechanism such as a lens shutter in a camera, or a folding-type light-shielding mechanism like a focal plane shutter. Mechanism, etc. However, in this case, in the former light-shielding mechanism of the lens shutter type, the light-shielding portion has to be opened relatively large in order to introduce the light flux of the external image, and the movement amount becomes large, so that the external environment in the light-shielding portion increases. There is a drawback that a sufficient space is required around the image-introducing optical path, and also in the latter light shielding mechanism using a focal plane shutter type, in addition to the same disadvantages as the former,
There is a drawback that shocks such as vibrations caused by folding operation of multiple blind shutter pieces are directly transmitted to the head, and such a light-shielding mechanism with a mechanical shutter is installed directly on the head or face. Each of the display devices used is not preferable.

Therefore, as a light-shielding portion mechanism attached to a conventional head- or face-mounted image display device of this type, for example,
As disclosed in JP-A-2-281891,
A means for switching between the original image projected by using a liquid crystal shutter and the external image has been proposed. However, even in the case of this light-shielding mechanism using a liquid crystal shutter, since the light-shielding rate of the liquid crystal shutter itself is lower than that of the mechanical shutter, a sufficient light-shielding action cannot be obtained. In such environment, outside light may be seen through and light of a fluorescent lamp or the like may be seen through in the room, which is not preferable for original image observation.

The present invention has been made to solve the above-mentioned conventional problems, and the purpose thereof is to:
A head- or face-mounted display device provided with an effective see-through function.

[0008]

In order to achieve the above object, a head-on or face-mounted display device with a see-through function according to the present invention comprises an optical opening portion at predetermined intervals.
That is, a plurality of shutter plate members having a light-transmitting portion are used by being overlapped, and at least one shutter plate member is made to be differential with respect to the other shutter plate member so that the respective light-transmitting portions of both shutter plate members are matched or The shutters can be opened (transmitted) by making them substantially coincident with each other, and the shutters can be closed (light-shielded) by making them not coincident or substantially not coincident with each other.

On the other hand, in the head-on or face-mounted display device with a see-through function according to the present invention, a plurality of polarizing shutter plate members having polarizing portions whose polarization axes are orthogonal to each other at predetermined intervals are used in combination, and at least One polarization shutter plate member is made to differ from the other polarization shutter plate member, and the polarization axes of the respective polarization parts of both polarization shutter plate members are made to coincide or substantially coincide with each other, whereby a light transmission state, non-coincidence or substantially non-coincidence is achieved. By making them coincident with each other, a light-shielding state can be obtained, and further, a plurality of polarizing plate members are polymerized and used, and at least one of the polarizing plate members is differentiated with respect to the other polarizing plate member so that the polarizing plates are polarized with each other. By making the axes coincide or substantially coincide with each other, a light transmitting state can be obtained, and by making them non-coincident or substantially non-coincident, a light shielding state can be obtained.

That is, the first invention of the present invention is to provide an image display element for displaying an image, an eyepiece optical system for guiding the light flux of the image to the observer's eyeball, and external light for guiding an external image to the observer's eyeball. In a head-on or face-mounted display device with a see-through function, which is provided on the road and has at least a shutter mechanism that transmits or shields the light flux of the external field image to adjust observation of the external field image, the shutter mechanism is a translucent Of two or more shutter plate members in which the light-shielding portion and the light-shielding portion are alternately formed adjacent to each other, and the light-transmitting portion and the light-shielding portion of each shutter plate member are substantially matched or substantially not matched with each other. The see-through function is characterized by including shutter plate driving means for movably superposing and arranging the shutter plate members, and for differentially moving at least one of the superposed shutter plate members with respect to the other. Is an odd head or face-mounted display device.

A second aspect of the present invention is an image display device for displaying an image, an eyepiece optical system for guiding the light flux of the image to an observer's eyeball, and an external light for guiding an external image to the observer's eyeball. In a head-on or face-mounted display device with a see-through function, which is provided on the road and has at least a shutter mechanism that transmits or shields the light flux of the external image and adjusts the observation of the external image, a polarization axis is used as the shutter mechanism. Using two or more polarizing shutter plate members in which first and second polarizing units adjacent to each other are alternately formed, and each polarizing shutter plate member is provided with a first polarizing unit and a second polarizing unit. And a polarizing plate driving means for movably arranging and arranging them so as to correspond to each other so as to be substantially matched or substantially not matched, and at least one of the superimposed polarizing shutter plate members is differentiated with respect to the other. DOO is a see-through function head- or face-mounted display device and said. The invention added to the second invention of the present invention is characterized in that the polarizing plate member has a light shielding portion between the first polarizing portion and the second polarizing portion.

Further, a third aspect of the present invention is an image display device for displaying an image, an eyepiece optical system for guiding the light flux of the image to an observer's eyeball, and external light for guiding an external image to the observer's eyeball. Is installed on the road, transmits or shields the light flux of the external image,
In a head-on or face-mounted display device with a see-through function, which comprises at least a shutter mechanism for adjusting observation of an external image, as the shutter mechanism, two or more polarizing plate members each having a polarization axis in a predetermined direction are used, and each polarizing plate is used. The members are rotatably overlapped with each other by an amount corresponding to the rotation amount such that the respective polarization axis directions are substantially parallel or substantially orthogonal, and at least one of the overlapped polarizing plate members is rotated with respect to the other. A head- or face-mounted display device with a see-through function, characterized by comprising polarizing plate rotating means.

[0013]

According to the first aspect of the present invention, at least one shutter plate member is made to differ from the other shutter plate member by the shutter plate driving means, so that the translucent portion and the light shield between the shutter plate members are mutually different. When the parts are approximately matched,
When the shutters are opened (transparent) and are made to be substantially inconsistent with each other, the shutters are closed (shielded).

In the second aspect of the present invention, at least one polarization shutter plate member is differentiated from the other polarization shutter plate member by the polarizing plate driving means, so that the first polarization shutter plate member and the other polarization shutter plate member are mutually different. When the respective polarization axes of the polarization section and the second polarization section are substantially aligned with each other, a translucent state is obtained,
When they do not substantially coincide with each other, the light is blocked.

In the third aspect of the present invention, at least one polarizing plate member is rotated with respect to the other polarizing plate by the polarizing plate rotating means, so that the polarizing axes of the respective polarizing plate members are substantially aligned with each other. Then, the light-transmitting state is set, and when they are substantially non-matching, the light-blocking state is set.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, different embodiments of the head-on or face-mounted display device with a see-through function according to the present invention will be described in detail with reference to FIGS.

First, the outline of the head- or face-mounted display device with a see-through function will be described.

1 and 2 show a head mounted display (hereinafter referred to as HMD) device according to the present invention, in particular, an arrangement of an optical system according to another example of an HMD device having a see-through function. FIG. 3 is a plan explanatory view and a side explanatory view schematically showing a state of being attached to the.

In FIG. 1, a head-mounted HMD device 20 has a so-called goggle type structure in which a device main body 22 is mounted on a head 11 of an observer 10 by using a headband 21. A liquid crystal display (hereinafter referred to as LCD) element 23 as an image display element that is disposed inside the head 11 of the observer 10 and the head 1
The concave half mirror 25 arranged in front of the left and right eyeballs 1 in FIG.
The front side of the main body 22, and thus the front side of the external optical path that guides the external image to the eyeball 12 of the observer 10, on the rear side of the eyepiece optical system 24 including the relay optical system 26 that relays to 5 and the concave half mirror 25. And a shutter mechanism 30 which is disposed in the section and transmits or shields the light flux of the external field image.

Thus, in the case of the HMD device 20 having the configuration shown in FIG. 1, the light flux of the image displayed on the LCD element 23 is relayed to the concave half mirror 25 by the relay optical system 26, and the concave half mirror 25 Is imaged as a magnified image in the air, and then guided to the eyeball 12 of the observer 10 for observation. At this time, when the shutter mechanism 30 is closed, the outside world image such as an external scene is completely shielded, and only the magnified image is observed.
Further, when the shutter mechanism 30 is open, the external image passes through the opened shutter mechanism 30 and after passing through the concave half mirror 25, and is then combined with the magnified image to be observed. Or, it will be directly observed with the image once erased.

The configuration of FIG. 1 is as shown in FIG.
The LCD element 23 is arranged above the front part of the head 11 of the observer 10, and the optical paths are overlapped from the half mirror 27 arranged in front of the eyeball 12 to the concave mirror 28 arranged below the front part. Maybe, in this case too,
Shutter mechanism 30 for transmitting or blocking the light flux of the external image
Is disposed on the back side of the half mirror 27 and on the front side of the apparatus body 22 on the external optical path that guides the external image to the eyeball 12 of the observer 10. That is, the half mirror 27 is arranged obliquely to the optical axis at the front position of the eyeball 12 of the observer 10, and the concave mirror 28 is arranged below the half mirror 27.
The half mirror 27 reflects an image from the LCD element 23 arranged above the front part outside the optical axis to the concave mirror 28 side, and the concave mirror 28 magnifies and reflects the reflected image as an enlarged image in the air. Further, the magnified image passes through the half mirror 27, is guided to the eyeball 12 and is observed.

As described above, the gist of the present invention is, in the HMD device 20 having such a configuration,
The shutter mechanism 30 is provided for taking in an external world image as needed while observing an image using the HMD device 20.

Next, respective embodiments of the shutter mechanism 30 applied as a see-through function to the HMD device 20 having the above-mentioned structure will be described. Here, as described above, the shutter mechanism 30 is normally kept closed by being always closed,
If necessary, it is opened by any means such as manual, mechanical, electrical or electromechanical to maintain the transparent state for a necessary time.

First Embodiment FIGS. 3 to 5 show a shutter mechanism of an HMD device according to a first embodiment to which the first invention of the present invention is applied.
FIG. 3 is a front explanatory view showing the concept of each shutter plate member constituting the main part of the shutter mechanism separately, and FIGS. 4 (a) and 4 (b).
5A and 5B are operation explanatory views showing a shielding state and a transmission state of each shutter plate member, and FIGS. 5A and 5B are front views showing respective different modified examples of the shutter plate member. It is a figure.

In each of FIGS. 4 and 5, the shutter mechanism 30 has first and second shutter plate members 31 and 32, respectively.
2, the translucent portions 31a, which are parallel to each other in the lateral direction,
32a and the light-shielding portions 31b and 32b are alternately formed so as to be adjacent to each other at a constant pitch interval (constant period), and the shutter plate members 31 and 32 are mutually transparent.
a and 32a and the light-shielding portions 31b and 32b are arranged so as to overlap with each other so as to overlap with each other by a movable amount as small as possible and a gap corresponding to a differential amount that is substantially matched or substantially not matched. On the other hand, the other shutter plate member 32 can be differentially operated by the shutter plate driving device 33 by a differential amount. Here, the translucent portions 31a, 32
a and the light-shielding portions 31b and 32b make it possible to shield one light-transmitting portion 31a by the other light-shielding portion 32b, and the other light-transmitting portion 32a by the one light-shielding portion 31b, easily and closely. Therefore, it is desirable to set the vertical width of each of the light transmitting portions 31a and 32a to be slightly smaller than the vertical width of each of the light shielding portions 31b and 32b. Further, as described above, the shutter plate drive device 33 may be any drive device as long as it has the same action, and for example, the shutter plate members 31 and 32 are It suffices to always urge it in the closing direction with a spring or the like so as to exert a pressure against the urging force of the fingertip or the plunger.

Therefore, in the configuration of the first embodiment, the normally closed state (shielded state; the transmittance of the external image light flux is theoretically 0%, and is substantially related to the light transmittance of the material plate. Therefore, for the first and second shutter plate members 31 and 32 of the shutter mechanism 30 which are maintained (corresponding to FIG. 4 (a)), the shutter plate drive device 33 is used as necessary. Completely open by the operation of (transmissive state; the transmittance of the external image light flux is theoretically 100%, and substantially 70% or more because it is substantially related to the light transmittance of the material plate). It can be changed (corresponding to Figure 4 (b)). And in the open state like this,
The light-shielding portions 31b and 3 of the shutter plate members 31 and 32, respectively.
Due to the presence of 2b, it seems that you are looking through the blind curtain to the outside image, but this kind of HMD
The shutter used in the device 20 is sufficiently usable, and in this completely transmissive state, the external image is introduced through the shutter mechanism 30 and can be easily observed.

In the first embodiment, the case where two shutter plate members are used has been described. However, by combining more than two shutter plate members, the respective functions of blocking and transmitting (shutter closing and opening) can be achieved. It can be done more effectively.
Further, in the first embodiment, one shutter plate member 31 is operated to differentially operate the other shutter plate member 32 by the shutter plate driving device 33. However, the reverse operation is also possible. Is each shutter plate member 31, 3
The two may be made to differentially move in different directions, and in this case, the operations of blocking and transmitting (closing and opening the shutter) can be quickly performed in a smaller operating range. . Further, in the case of the first embodiment, the light transmitting portion 31
Although the a and 32a and the light shielding portions 31b and 32b are formed in the horizontal direction, they may be formed in the vertical direction, and depending on the situation, the oblique direction is not prevented.

Further, the light transmitting portions 31a and 32a and the light shielding portions 31b and 32b for the shutter plate members 31 and 32, respectively.
For the formation of, by devising its shape,
These light transmitting portions 31a and 32a and light shielding portions 31b and 32
It is possible to perform the same function not only by the opening and closing operation by the parallel differential that is orthogonal to the longitudinal direction of b but also by performing the rotational differential. A modified example devised in this way is shown in FIG.
Shown in (b). That is, the shutter plate member 3 shown in FIG.
5 is a modified example in which the upper left ridge corner is used as the center of rotation, and similarly has a light transmitting portion 35a and a light shielding portion 35b, and the shutter plate member 36 shown in FIG. 5 (b). Shows a case of a modified example in which the center part of the whole is set as the rotation center, and similarly has a light transmitting part 35a and a light shielding part 35b. Therefore, each shutter plate member 35, 3 configured in this way
According to 6 as well, the same operational effect as in the case of the configuration of the first embodiment can be obtained.

Second Embodiment FIGS. 6 and 7 show a shutter mechanism of an HMD device according to a second embodiment to which the first invention of the present invention is applied.
FIG. 6 is a front explanatory view showing the concept of each shutter plate member constituting the main part of the shutter mechanism separately, and FIG. 7 is a front explanatory view showing one modified example of the shutter plate member. .

In the second embodiment, as shown in FIG. 6, the first and second shutter plate members 41 and 4 are provided.
2, the translucent parts 41a, 42a and the light shielding parts 41b, 42b which are parallel to each other in the horizontal direction in the upper half part and the translucent parts 41c, which are parallel to each other in the longitudinal direction in the lower half part, 42
c and the light shielding portions 41d and 42d are formed respectively.

Therefore, in the case of the configuration of the second embodiment, only the lower half side of the shutter opening is opened depending on the relative differential between the first and second shutter plate members 41 and 42 in the lateral direction. Therefore, depending on the differential in the vertical direction, only the upper half side can open the shutter, and as a result, a selective partial transmission state can be realized, which allows the corresponding parts opened as shutters to pass through. A clear external image can be observed. Further, in this case, by the direction in which the horizontal direction and the vertical direction are combined, that is, the differential in the diagonal direction,
Although the non-coincident overlapping part is generated between a very small part of the light-transmitting part and the light-shielding part, the transmittance is slightly lowered, but the required overall transmissive state can be easily realized.

Also in the second embodiment, the supplementary description of the conditions for each shutter plate member, its light-shielding portion, light-transmitting portion, and shutter plate driving device is exactly the same as in the previous example.

Further, as shown in FIG. 6, with respect to the shutter plate member 45, a light-transmitting portion 45a and a light-shielding portion 45b each having a smaller width and a smaller pitch interval in the upper half portion are provided in the lower half portion. When forming the light-transmitting portion 45c and the light-shielding portion 45d in which the width and the pitch interval are relatively large, the transmittance of the transparent state can be changed depending on the differential amount. That is, by appropriately setting the width dimension and the pitch dimension, the differential amount is selected to set the upper half side only or the lower half side to the fully open transmission state, or the upper half side is set. It is possible to perform operations such as a fully open transmission state and a lower half side with a semi-open transmission state to adjust the transmittance of each part.

Third Embodiment FIGS. 8 to 10 show a third embodiment to which the second invention of the present invention is applied.
9 shows a shutter mechanism of an HMD device according to an embodiment, and FIG. 8 is a front explanatory view showing the concept of each polarization shutter plate member that constitutes a main part of the shutter mechanism separately, FIG.
(a), (b) is operation explanatory drawing which shows the shielding state and transmission state of each polarization shutter board member, and FIG. 10 is a front explanatory view showing one modification of the same polarization shutter board member. Is.

In each of FIGS. 8 and 9, the shutter mechanism 30 has first and second polarization shutter plate members 51 and 52, and each shutter plate member 5
Reference numerals 1 and 52 denote first polarizing portions 51a and 52a and second polarizing portion 5 which are parallel to each other in the lateral direction and whose polarization axes are orthogonal to each other.
1b and 52b are formed at a constant pitch interval (constant period) so as to be alternately adjacent to each other under the interposition of the light shielding portions 51c and 52c, and the respective polarization shutter plate members 51 and 52 are connected to each other by the first. Polarizers 51a and 52a and second polarizer 5
The polarization axes of the polarization shutter plates 1b and 52b are arranged so as to overlap with each other with a gap as small as possible and movable corresponding to a differential amount in which respective polarization axes are made substantially parallel or substantially orthogonal.
On the other hand, the other polarizing shutter plate member 52 is configured to be differentially operated by the polarizing plate driving device 53 by a differential amount. Here, the light-shielding portions 51c and 52c interposed between the first polarizing portions 51a and 52a and the second polarizing portions 51b and 52b are the boundaries due to the distortion of the polarizing plate material, the deviation at the time of differential, and the like. It is intended to prevent the gap light from the vicinity of the portion, and it may be omitted in some cases.

Therefore, in the structure of the third embodiment, the normally closed state (completely shielded state; since the polarizing plate is used, the light shielding rate is remarkably improved and theoretically 0%) is maintained ( Figure 9
For the first and second polarization shutter plate members 51 and 52 of the shutter mechanism 30 (corresponding to (a)), the first polarization unit 51a is operated by the operation of the polarization plate drive device 53 as necessary. , 52a and the second polarizing portions 51b, 52b are gradually made to be differential in the direction in which the respective polarization axes are parallel to each other, whereby the light transmittance is gradually increased corresponding to the differential distance, whereby the external environment is increased. The image gradually became clear, and when the polarization axes were completely parallel, it was in a completely open state (completely transmissive state; similarly, since a polarizing plate was used, the light transmittance was significantly improved. The theoretical value is 100%, but substantially the theoretical value is equivalent to a value obtained by subtracting the corresponding light shielding amount by the light shielding portions 51c and 52c) (corresponding to FIG. 9 (b)). It is possible to observe a clear external image in this completely transmitted state. It Here, in the state in which the light is completely opened in this way, unlike the cases of the first and second embodiments, it is the light shielding portions 51c and 5 that hinder the light transmission.
2c only, and when the light shielding portions 51c and 52c are omitted, when the respective polarization axes are accurately parallel or orthogonal to each other at the differential position, the light shielding rate and the light transmitting rate are theoretically 1
It will reach 00%.

Also in the third embodiment, the supplementary conditions of the respective polarization shutter plate members, the first and second polarization parts thereof, and the polarization plate driving device will be described with respect to the first and the second embodiments. This is almost the same as the case of each of the second embodiment.

The polarizing shutter plate members 51, 5 are also provided.
Regarding the first polarizing portions 51a and 52a, the second polarizing portions 51b and 52b, and the light shielding portions 51c and 52c for 2,
Similar to the case of the first embodiment, by devising the shape, not only the opening / closing operation by the parallel differential but also the rotational differential can perform the same function. A modified example devised in this way is shown in FIG. That is, the polarization shutter plate member 55 of FIG. 10 is shown corresponding to FIG. 5 (a), and shows a modified example in which the upper left corner is the center of rotation. Also according to the above, the same operational effects as in the case of the configuration of the third embodiment can be obtained.

Fourth Embodiment FIG. 11 shows the concept of each polarizing plate member constituting the main part of the shutter mechanism of the HMD device according to the fourth embodiment to which the third invention of the present invention is applied, and its polarizing plate rotating device. It is a perspective explanatory view showing.

In FIG. 11, the shutter mechanism 30
Uses the first and second polarizing plate members 61 and 62 each having a polarization axis in a predetermined direction, and the polarization axis directions of the polarizing plate members 61 and 62 are substantially parallel to each other. The first polarizing plate member 61 and the second polarizing plate member 62 are arranged so as to be superposed in a rotatable manner and in a minute gap as much as possible so as to be substantially orthogonal to each other.
It is configured such that the rotating operation can be performed by 3 in correspondence with the rotation amount.

Therefore, in the construction of the fourth embodiment, the polarization axes are always orthogonal to each other and closed (completely shielded state; the light shielding rate is theoretically 0% because the polarizing plate is used). For each of the first and second polarizing plate members 61 and 62 of the shutter mechanism 30 that is maintained, gradually rotate the polarizing plate rotation device 63 in the direction in which the polarization axes are parallel to each other, if necessary. Then, the transmissivity gradually increases corresponding to the rotation angle, and the external image gradually becomes clear by this, and when the polarization axes are completely parallel, the open state (complete transmissive state; Since a polarizing plate is used as the polarizing plate, the light transmittance can theoretically shift to 100%),
In this perfect transmission state, a clear external image can be observed.

[0042]

As described above in detail with reference to each embodiment, according to the first invention of the present invention, an image display element for displaying an image and an eyepiece optical system for guiding a light flux of the image to an eyeball of an observer. And a shutter mechanism that is interposed on the external optical path that guides the external image to the eyeball of the observer, transmits or shields the light flux of the external image, and adjusts the external image observation. In a display device, two or more shutter plate members in which light-transmitting portions and light-shielding portions are alternately formed adjacent to each other are used as a shutter mechanism, and the respective light-transmitting portions and light-shielding portions are substantially separated from each other. A structure is provided that includes shutter plate driving means for movably overlapping and arranging in correspondence with a differential amount that is matched or substantially non-matched, and that makes at least one of the superimposed shutter plate members differential with respect to the other. Therefore, the shutter plate driving means allows the shutter plate members to be opened in a substantially coincident manner with the light-transmitting portions and the light-shielding portions of the shutter plate members by a simple operation of only differentiating the shutter plate members from each other. ) State, and the shutters can be closed (light-shielded) in a substantially non-matching manner.

According to the second aspect of the present invention, similarly, in the head-on or face-mounted display device with a see-through function, the shutter mechanism has first and second polarization axes that are alternately orthogonal to each other. 2 with adjacent polarizing parts
Using one or more polarizing shutter plate members, the respective polarizing shutter plate members are movably overlapped with each other by an amount corresponding to a differential amount such that the respective first polarizing portions and second polarizing portions are substantially matched or substantially not matched. The polarizing shutter driving member is arranged so as to be different from each other and at least one of the superposed polarizing shutter plate members is differentiated from the other. With a simple operation of simply moving, the polarization axes of the first polarization part and the second polarization part of the respective polarization shutter plate members can be made to substantially match with each other so as to be in a translucent state, and can be made to have substantially no match. It can be shielded from light.

Further, according to the third aspect of the present invention, similarly, in a head-on or face-mounted display device with a see-through function, as a shutter mechanism, two or more polarizing plate members having a polarization axis in a predetermined direction. , Each of the polarizing plate members are rotatably overlapped with each other by an amount corresponding to the amount of rotation such that the respective polarization axis directions are substantially parallel or substantially orthogonal, and at least one of the polymerized polarizing plate members is the other. Since the polarizing plate rotating means for rotating with respect to each other is provided, the polarizing axes of the respective polarizing plate members are substantially coincident with each other by a simple operation of simply making the respective polarizing plate members mutually different by the polarizing plate rotating means. It can be set to a light-transmitting state, and can be set to a non-matching state to be a light-shielding state.

[Brief description of drawings]

FIG. 1 is an explanatory plan view schematically showing an arrangement configuration of an optical system according to an example of a display device of the present invention in a state of being mounted on an observer's head.

FIG. 2 is a side view schematically showing the arrangement configuration of the optical system according to the other example in a state of being mounted on the head of an observer.

FIG. 3 is a front explanatory view showing separately the configuration of each shutter plate member in the shutter mechanism of the display device in the first embodiment to which the first invention of the present invention is applied.

FIG. 4A is an operation explanatory view showing a shielding state of each shutter plate member of the first embodiment. (b) is an operation explanatory view showing a transmission state of each shutter plate member of the first embodiment.

FIG. 5A is an explanatory front view showing a modification of the shutter plate member of the first embodiment. (b) is the first
It is a front explanatory view showing other modifications in the shutter board member of an example.

FIG. 6 is an explanatory front view showing separately the configuration of each polarization shutter plate member in the shutter mechanism of the display device in the second embodiment to which the first invention of the present invention is applied.

FIG. 7 is an explanatory front view showing a modification of the polarization shutter plate member of the second embodiment.

FIG. 8 is a front explanatory view showing separately the configuration of each polarizing plate member in the shutter mechanism of the display device in the third embodiment to which the second invention of the present invention is applied.

FIG. 9A is an operation explanatory view showing a shielding state of each polarizing plate member of the third embodiment. (b) is an operation explanatory view showing a transmission state of each polarizing plate member of the third embodiment.

FIG. 10 is a front view showing a modification of the polarizing plate member of the third embodiment.

FIG. 11 is a perspective explanatory view showing the concept of each polarizing plate member and its polarizing plate rotating device in the shutter mechanism of the display device in the fourth example to which the third invention of the present invention is applied.

FIG. 12 is a side view showing a form of a conventional goggle type display device.

FIG. 13 is a side view showing the form of a conventional display device of the Melmet type.

[Explanation of symbols]

 10 Observer 11 Head 12 Eyeball 20 Head-mounted display device 21 Headband 22 Device body 23 Liquid crystal display element (image display element) 24 Eyepiece optical system 25 Concave half mirror 26 Relay optical system 27 Half mirror 28 Concave mirror 30 Shutter Mechanism 31, 41 First shutter plate member 31a, 41a, 41c Light transmitting part 31b, 41b, 41d Light shielding part 32, 42 Second shutter plate member 32a, 42a, 42c Light transmitting part 32b, 42b, 42d Light shielding part 33 Shutter plate driving device 35, 36 First and second shutter plate members 51 First polarizing shutter plate member 51a First polarizing part 51b First polarizing part 52 Second polarizing shutter plate member 52a First polarized light Part 52b first polarizing part 53 polarizing plate driving device 55, 36 first, Each shutter plate member 61 of the 2 first polarizer member 62 and the second polarizing plate member 63 polarizing plate rotating device

Claims (4)

[Claims] 1. An image display element for displaying an image, an eyepiece optical system for guiding a light flux of the image to an observer's eyeball, and an external field image path for guiding an external image to the observer's eyeball. In a head-on or face-mounted display device with a see-through function, which has at least a shutter mechanism that transmits or shields the light flux of, and adjusts the external image observation, a transparent portion and a light-shielding portion are alternately formed adjacent to each other as the shutter mechanism. By using two or more shutter plate members, the shutter plate members are movably overlapped with each other by a differential amount such that the respective light-transmitting portions and light-shielding portions are substantially matched or substantially not matched. And a shutter plate drive means for differentially changing at least one of the shutter plate members that have been superimposed with respect to the other shutter plate member, and a head- or face-mounted display with a see-through function. B devices. 2. An image display device for displaying an image, an eyepiece optical system for guiding a light flux of the image to an observer's eyeball, and an external field optical path for guiding an external image to the observer's eyeball. A see-through head or face-mounted display device that has at least a shutter mechanism that transmits or shields the light flux of, and adjusts the observation of the external image, wherein the shutter mechanism includes first and second polarization axes that are alternately orthogonal to each other. Two or more polarizing shutter plate members in which the respective two polarizing parts are adjacently formed are used, and the first polarizing part and the second polarizing part of each polarizing shutter plate member are substantially matched or substantially not matched. And a polarizing plate driving means for movably arranging them so as to correspond to each other by a differential amount and differentially making at least one of the superimposed polarizing shutter plate members relative to the other. Function with the head or face-mounted display device. 3. The polarizing plate member has a light shielding portion between the first polarizing portion and the second polarizing portion.
A head- or face-mounted display device with the see-through function described. 4. An image display element for displaying an image, an eyepiece optical system for guiding a light flux of the image to an observer's eyeball, and an external field image path for guiding an external image to the observer's eyeball. In a head-on or face-mounted display device with a see-through function, which has at least a shutter mechanism that transmits or shields the light flux of, and adjusts the external image observation, as the shutter mechanism, two or more sheets having a polarization axis in a predetermined direction are used. A polarizing plate member is used, and the respective polarizing plate members are rotatably overlapped with each other by an amount corresponding to the amount of rotation such that the respective polarization axis directions are substantially parallel or substantially orthogonal, and at the same time, A head- or face-mounted display device with a see-through function, comprising polarizing plate rotating means for rotating at least one of them with respect to the other.