JPH0821974A - Head-mounted type liquid crystal display device - Google Patents

Abstract

PURPOSE:To obtain high visibility and safety and to prevent adverse influence from being exerted on viewer's health by providing a shielding means shielding one part of a gap between the face of the viewer and the device. CONSTITUTION:A liquid crystal display element 104, a reflection mirror 105, and an enlarging lens means 106 are housed in a display unit 103 arranged in front of the right eye of the viewer by a holding means 101. Meanwhile, a visor 107 having appropriate transmissivity is arranged in front of the left eye of the viewer. Thus, the luminance of an outside scenery picture viewed by the left eye is reduced and the visibility of a displayed picture viewed by the right eye is improved relatively in the case where the pictures viewed by the right eye and the left eye are melted together in the brain of the viewer. A shielding plate 108 is provided so that it is integrated with the holding means 101 or it is to be nearly erect on the surfaces of the display unit 103 and the visor 107 on the viewer side. Since stray light entering from the side of the viewer through the gap between the face of the viewer and the device is prevented by this shielding plate 108, the contrast of the enlarged and displayed picture is restrained from lowering and the visibility is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head mounted liquid crystal display device.

[0002]

2. Description of the Related Art At present, a head-mounted liquid crystal display device has been proposed in order to meet the demand for enhancing the realism of a video display screen and the demand for enhancing the portability of a video / image display. These include a twin-lens system in which an image is displayed on both the left and right eyes of a viewer and a monocular system in which an image is displayed only on either the left or right eye of the viewer.
The latter is disclosed in US Pat. No. 5,162,828.

[0003]

However, these head-mounted liquid crystal display devices have the following problems. This will be described with reference to FIG. FIG. 8A is a view of a viewer wearing a head-mounted liquid crystal display device as seen from above,
FIG.8 (b) is the figure seen from the side.

In the conventional example, the viewer 801 and the device 8
There will always be a gap with 02. Outside light 80 from the gap
4 enters, and is reflected by the device 802 or the eyeglasses 803 of the viewer to become stray light, which disturbs the displayed image or lowers the contrast to significantly reduce the visibility of the image. Also, in order to continue to see such an image with poor visibility, the viewer needs a lot of labor for viewing, which causes fatigue of the whole body and eye strain, which adversely affects health.

On the other hand, as disclosed in Japanese Utility Model Laid-Open No. 46-058434 or its application, there is an example in which the gap between the apparatus and the viewer is completely covered with a light-shielding plate to avoid the above problems. This is shown in FIG.

In this example, a light shielding plate 902 is provided to completely cover the gap between the device 901 and the viewer. However, in this way, since the ventilation cannot be performed, the magnifying lens and the glasses become cloudy due to the sweating and heat generation of the human body,
There is a problem that the visibility of the displayed image is significantly deteriorated and the viewer's visual field is completely limited to the display image area, so that the information on the environment surrounding the viewer is completely blocked, which is not preferable for safety.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a head-mounted liquid crystal which has high visibility and safety and which does not adversely affect the health of viewers. It is to provide a display device.

[0008]

The head mounted liquid crystal display device of the present invention comprises: a) at least one liquid crystal display element;
(B) A head-mounted liquid crystal display device having a magnifying optical means for forming a magnified virtual image of the liquid crystal display element, and (c) a holding means for holding the liquid crystal display element and the magnifying optical means on a viewer's head. In d), the head-mounted liquid crystal display device shields a part of a gap between the face of the viewer and the head-mounted liquid crystal display device, and has a transmittance of 1 to visible light.
It is characterized by having a smaller shielding means.

Further, in such a head mounted liquid crystal display device, the transmittance of the shielding means with respect to visible light is greater than zero.

Further, the installation angle of the shielding means with respect to such a head-mounted liquid crystal display device is variable.

Further, the shielding means is removable.

Furthermore, the face-side surface of the viewer of such a head-mounted liquid crystal display device is characterized by being subjected to antireflection treatment or antireflection treatment.

[0013]

According to the structure of the present invention, since at least a part of the device has a shielding means for shielding a part of the gap between the face of the viewer and the device, stray light is reduced to reduce the stray light of the display screen. The visibility can be improved. In addition, since at least a part of the gap is not shielded, it is possible to see the surroundings from there, so it is highly safe, and since ventilation can be performed from there, the visibility due to fogging of the magnifying lens and glasses is remarkable. There is no decline.

Further, since the shielding means having a transmittance of 0 or more is used, external information can be obtained through the shielding means, and the safety is enhanced.

Furthermore, since the installation angle of the shielding means can be changed, the amount of stray light and the field of view of the viewer can be freely adjusted according to the angle.

Further, since the shielding means is detachable, fine stray light can be removed according to the brightness of the surrounding environment.

Furthermore, since the face of the head-mounted liquid crystal display device on the face side of the viewer is subjected to antireflection treatment or antireflection treatment, the effect of removing stray light by the shield plate is further enhanced. be able to.

[0018]

【Example】

(Embodiment 1) A first embodiment of the present invention will be described with reference to FIG. This embodiment is an example in which the present invention is applied to a monocular head-mounted liquid crystal display device.

A viewer mounts the device on the head by means of a holding means 101 in the shape of a temple of eyeglasses and a string-like elastic body 102 provided so as to be arranged on the back of the head. Display unit 103 arranged in front of the viewer's right eye by holding means 101
The liquid crystal display element 104, the reflecting mirror 105, and the magnifying lens means 106 are housed in the liquid crystal display element 1 through the magnifying lens means 106 and the reflecting mirror 105.
By looking into 04, an enlarged virtual image of the image displayed on the liquid crystal display element can be seen in front.

On the other hand, a visor 107 having an appropriate transmittance is arranged in front of the left eye. This reduces the brightness of the outside image seen by the left eye when fusing the image seen by the right eye and the image seen by the left eye in the viewer's brain, and relatively improves the visibility of the displayed image seen by the right eye. It is provided for.

In this embodiment, it is integrated with the holding means 101 in FIG. 1 (a), and in FIG. 1 (b), the display unit 103 and the visor 107 are substantially upright on the viewer side. A shield plate 108 is provided. The shielding plate 108 can prevent stray light that enters from the side of the viewer through the gap between the viewer's face and the device, so that it is possible to suppress the decrease in the contrast of the enlarged display image and improve the visibility. . Further, since the viewer can see the image with high visibility, eyestrain and physical fatigue do not occur even after watching for a long time.

Further, since there are many gaps where no shielding plate is provided, it is possible to know the state of the surrounding environment from there and it is highly safe. Moreover, since ventilation can be performed from there, there is no reduction in visibility due to clouding of the magnifying lens means 106 and the glasses of the viewer.

The transmittance of the light shield plate 108 can be freely set according to the brightness of the surroundings of the viewer and his / her preference, but when it is translucent, it has the following advantages. This will be described with reference to FIG.

In FIG. 2, a region 201 is a shield plate 202.
It is the viewing area of the viewer that is blocked by. Shielding plate 202
Without this, the viewer can see the outside through this area, which is preferable from the viewpoint of safety. Shielding plate 202
Is opaque, the effect of removing stray light is high, but
On the other hand, the field of view of the region 202 is completely blocked, which is not preferable in terms of safety.

Therefore, by making the shielding plate 202 semi-transparent, it is possible to both eliminate stray light and ensure safety.

The position of the shielding plate can be arbitrarily set as shown in FIG. 3 depending on the direction of stray light to be shielded. FIG.
8 shows an example in which the light shielding plates 308 and 309 are installed near the upper side of the visor 307 and near the left side of the display unit. Of course, besides these, visor 3
It is also possible to install them in the vicinity of the right side portion, the lower side portion, the upper side portion, and the lower piece portion of the display unit 303.

However, special consideration is required in the usage mode in which the head-mounted liquid crystal display device is used as a display of a personal computer or a word processor as shown in FIG. In such a usage pattern, the viewer must view the magnified image in the direction of the arrow 402 and perform input work from the keyboard. At the time of this inputting work, the viewer is required to display unit 40.
4. It is necessary to view the keyboard 403 through the gap between the viewer and the device below the visor 405. That is, the field of view 40
We must secure 1.

Therefore, in such a usage mode, it is not preferable to install a shielding plate in the gap between the viewer and the device under the display unit 404 and the visor 405.

In order to freely change the position of the shielding plate according to the surrounding environment and preference, as shown in FIG.
04, holding means 505 and a display unit (not shown) are provided with holes 503 for installation in advance at a plurality of positions, and projections for installation are also provided on the shielding plate 501. Further, if the shield plate 501 having various sizes and shapes is prepared, fine adjustment can be performed.

Further, as shown in FIG. 5B, the shield plate 5
If the hinge means 506 is provided in 07, the installation angle of the shield plate 507 with respect to the visor 504 can be adjusted,
Thus, stray light can be removed according to changes in the surrounding environment without removing the shield plate 507 from the visor 504. This is effective when the brightness of the surrounding environment greatly changes within a short time such as when the head-mounted display device is used in the moving body.

Further, in all the examples described above, antireflection treatment or a surface made of a dielectric multilayer film is appropriately applied to the holding means, the visor, the surface of the display unit facing the viewer and the entire surface of the shielding plate. By performing the roughening non-glare treatment, stray light can be removed more effectively.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. This embodiment is an example in which the present invention is applied to a twin-lens head-mounted liquid crystal display device.

In the twin-lens head-mounted type liquid crystal display device shown in FIG. 6, the magnifying lens means 603 viewed by the left and right eyes is 2
Both of them are incorporated in the display unit 602. For each of the left and right magnifying lens means 603, FIG.
Similar to the display unit of the monocular head-mounted liquid crystal display device of FIG. 6, a reflection mirror and a liquid crystal display element are arranged (FIG. 6).
Not shown). FIG. 6A shows a holding means 60.
1 is an example in which the shield plate 604 is integrally installed in FIG. 1, and FIG. 6B is an example in which the shield plate 606 is installed in the vicinity of the outer lateral sides of the left and right magnifying lens means 603. Similar to the first embodiment, stray light can be effectively removed while maintaining high safety and visibility. In addition, the shielding plate 60
It goes without saying that the installation positions of 4, 606 are not limited to the positions shown in FIG. 6 but also the vicinity of the inner side, the vicinity of the upper side, and the vicinity of the lower side of the magnifying lens means 603. Also,
It goes without saying that the structure of the shielding plate and the installation position shown in FIG. 5 is effective for changing these installation positions.

By the way, the shielding plate is used as the magnifying lens means 603.
Special consideration is required when placing near the upper side.
This will be described with reference to FIG.

When the shield plate 701 is installed on the display unit 707 at an angle almost vertical to the display unit 707 as shown in FIG. 7A, the airflow 702 from below is shielded by the shield plate 701 and the viewer 70 is exposed.
Stay near face 5 Since the twin-lens head-mounted liquid crystal display device is inferior in air permeability to the monocular head-mounted liquid crystal display device described in the first embodiment, such poor flow of air flow is caused by a magnifying lens or glasses. Haze, which significantly deteriorates the visibility of the image.

To avoid this, it is effective to install the shielding plate 703 on the display unit 706 at an angle so as to follow the head of the viewer 705 as shown in FIG. 7B.
By doing so, it is possible to prevent stray light from entering from above while keeping the airflow 704 in a good condition. Airflow 7
As No. 04 is good, it is possible to prevent fogging of magnifying lenses and glasses. If the shielding plate 703 is curved so as to follow the head shape of the viewer 705, the effect is further enhanced.

Further, in all the examples described above, the antireflection treatment made of the dielectric multilayer film and the surface are appropriately roughened on the entire surface of the holding means, the surface of the display unit facing the viewer and the entire shield plate. By applying non-glare treatment,
Needless to say, stray light can be removed more effectively.

[0038]

As described above, according to the present invention, a part of the gap between the face of the viewer and the head-mounted liquid crystal display device is shielded so that the visible light transmittance is 1 or less. Since the small shielding means is provided, the visibility of the display screen can be improved by reducing the stray light. In addition, since at least a part of the gap is not shielded, it is possible to see the surroundings from there, so it is highly safe, and since ventilation can be performed from there, the visibility due to fogging of the magnifying lens and glasses is remarkable. There is no decline.

Since the shielding means having a transmittance of 0 or more is used, there is an effect that external information can be obtained through the shielding means and the safety can be enhanced.

Furthermore, since the installation angle of the shielding means can be changed, there is an effect that the amount of stray light and the visual field of the viewer can be freely adjusted according to the angle.

Further, since the shielding means is detachable, it is possible to remove fine stray light according to the brightness of the surrounding environment. .

Furthermore, since the face of the viewer of the head-mounted liquid crystal display device on the face side is subjected to antireflection treatment or antireflection treatment, the effect of removing stray light by the shield plate is further enhanced. The effect is that you can.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a device structure according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of an effect on safety of the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of an installation position of the shielding plate according to the first embodiment of this invention.

FIG. 4 is an explanatory diagram of a usage pattern of the first embodiment of the present invention.

FIG. 5 is an explanatory diagram of a structure of a shield plate and an installation position according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram of a device structure according to a second embodiment of the present invention.

FIG. 7 is an explanatory diagram of an installation angle and a structure of a shielding plate according to a second embodiment of the present invention.

FIG. 8 is an explanatory diagram of a stray light entry path in a conventional head-mounted liquid crystal display device.

FIG. 9 is an explanatory diagram of a stray light prevention structure in a conventional head-mounted liquid crystal display device.

[Explanation of symbols]

 101 Holding Means 102 String-like Elastic Body 103 Display Unit 104 Liquid Crystal Display Element 105 Reflecting Mirror 106 Magnifying Lens Means 107 Visor 108 Shielding Plate 201 Viewing Area of Viewer Obscured by Shielding Plate 202 Shielding Plate 203 Holding Means 204 String-like Elasticity Body 205 Display unit 206 Visor 301 Holding means 302 String-like elastic body 303 Display unit 304 Liquid crystal display element 305 Reflecting mirror 306 Magnifying lens means 307 Visor 308 Shielding plate 309 Shielding plate 401 Field of view for seeing 402 magnified image viewing direction 403 Keyboard 404 Display unit 405 Visor 501 Shielding plate 502 Protrusion 503 Installation hole 504 Visor 505 Holding means 506 Hinge means 507 Shielding plate 601 Holding means 602 Table Display unit 603 Magnifying lens means 604 Shielding plate 605 String-like elastic body 606 Shielding plate 701 Shielding plate 702 Airflow 703 Shielding plate 704 Airflow 705 Viewer 706 Display unit 707 Display unit 801 Viewer 802 Device 803 Glasses 804 Device 902 Outside light 901 Board

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroyuki Shindo 3-3-5 Yamato, Suwa City, Nagano Seiko Epson Corporation

Claims (5)

[Claims] 1. A) at least one liquid crystal display element,
(B) A head-mounted liquid crystal display device having a magnifying optical means for forming a magnified virtual image of the liquid crystal display element, and (c) a holding means for holding the liquid crystal display element and the magnifying optical means on a viewer's head. In d), the head-mounted liquid crystal display device shields a part of a gap between the face of the viewer and the head-mounted liquid crystal display device, and has a transmittance of less than 1 for visible light. A head-mounted liquid crystal display device having means. 2. The transmittance of the shielding means for visible light is 0.
The head-mounted liquid crystal display device according to claim 1, which is larger. 3. The head mounted liquid crystal display device according to claim 1, wherein an installation angle of the shielding means with respect to the head mounted liquid crystal display device is variable. 4. The head mounted liquid crystal display device according to claim 1, wherein the shielding means is removable. 5. The head-mounted liquid crystal according to claim 1, wherein a surface of the head-mounted liquid crystal display device on the face side of the viewer is subjected to anti-reflection processing or anti-reflection processing. Display device.