JPH1185051A - Head mounted display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to keep the level of a display screen part even if the head is tilted and to view an image with natural feeling without sense of incompatibility. SOLUTION: Right and left prism units 12a, 12b having the same shape are arranged in a main body 11. The prism units 12a, 12b are made freely rotatable by bearings 15a, 15b installed in bearing parts 14a, 14b via shafts 16a and 16b. A liquid crystal display board back light is installed on the upper part of respective prism unit 12a, 12b, and axles 20a, 20b are fitted in the lower part. The axles 20a, 20b are linked by a bearing member 21 to be freely rotatable, and a weight 22 is fixed in the center part of the bearing member 21. When the main body 11 is attached to the head then the head tilts for instance, the main body 11 also tilts but the prism units 12a, 12b are rotated centering the bearings 15a, 15b by the weight to maintain the level.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head mounted display device having a see-through portion.

[0002]

2. Description of the Related Art A conventional head mounted display device (hereinafter referred to as an HMD) 1 having a see-through portion of this kind.
In FIG. 4, for example, as shown in FIG. 4, the display screen unit 2 is translucent and the rear view is visible, or the rear view is visible from the see-through units 3 and 4 on the left and right portions of the display screen unit 2.
FIG. 4 shows a case where the display screen unit 2 displayed at an angle, the left see-through unit 3 and the right see-through unit 4 are simultaneously visible.

At this time, that the HMD 1 is tilted indicates that the HMD 1 is mounted on the head and the head is tilted. Since the HMD 1 is attached to the head, the display screen unit 2 is also inclined at the same time. However, since the background seen in the left and right see-through portions 3 and 4 does not tilt, the display screen portion 2 feels relatively swinging.

[0004]

When only the display screen unit 2 is viewed in a concentrated manner, the display screen unit 2 does not move relative to the eyes even if the head is tilted, so that it looks normal. However, since the head has the semicircular canal, it feels that the head is tilted, and the visible display screen unit 2 is at a normal position with respect to the eyes, so that the body feels strange.

In particular, in the HMD 1 having see-through portions 3 and 4 on the left and right as shown in FIG. 4 and the HMD of a type in which the display screen portion 2 can be seen through, such unnaturalness cannot be avoided. .

In such an HMD 1, the display screen unit 2 moves in synchronization with the head with respect to the movement or tilt of the head, but tilts with respect to the background, which is unnatural as a bodily sensation. I feel. This can also be explained from the fact that there is no sense of discomfort even when watching the TV screen placed on the table with the head tilted.

An object of the present invention is to provide a head-mounted display device in which, even when the head is tilted, the display screen section is kept horizontal and a natural feeling can be obtained without discomfort when viewing the display section of the HMD. To provide.

[0008]

According to a first aspect of the present invention, there is provided a head-mounted display device including a display screen for displaying a liquid crystal screen, which is housed in a main body, and a line of sight at a substantially central portion of the display screen. Provide a rotation axis that approximately matches the direction,
The display screen is rotatable about the rotation axis with respect to the main body, and a weight is attached to a lower portion of the display screen.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is an enlarged cross-sectional view of the embodiment, and FIG. 2 is a cross-sectional view along the line AA in FIG. 1. In the main body 11, right and left prism units 12 a and 12 b serving as display screen units are arranged. I have. The main body 11 includes an exterior portion 13 and bearing portions 14a and 14b.
The rotating shafts 16a, 16b attached to the prism units 12a, 12b are rotatable by bearings 15a, 15b provided on the a, 14b. Rotating shaft 16
Reference numerals a and 16b are provided so as to substantially coincide with the visual axis A of the eye E, and are fixed to the backs of the prism units 12a and 12b.

[0010] Holding frames 17a and 17b are integrated with the prism units 12a and 12b, respectively, and the holding frames 17a and 17b are respectively provided with liquid crystal display panels 18a and 18b.
8b and backlights 19a and 19b are attached. Shafts 20a and 20b are attached to the lower portions of the prism units 12a and 12b.
A bearing member 21 is rotatably connected between a and 20b, and a weight 22 is fixed to the center of the bearing member 21 so that the right and left eye prism units 12a and 12b operate integrally. Have been.

[0011] Then, between the rotating shafts 16a and 16b, the shafts 20a and 20b, so as not to cause a shift between the left and right display screen portions.
The distance between them is equal. The see-through portion 23a on the left and the see-through portion 23b on the right are provided on both left and right sides of the main body 11. By providing a liquid crystal shutter in these see-through portions 23a and 23b,
It is also possible to show or hide the background.

The electric mounting wiring boards 24a and 24b for lighting the liquid crystal display panels 18a and 18b and the backlights 19a and 19b are provided with prism units 12a and 12b.
Are flexible and have a sufficient length so that they can rotate freely, and are connected to the circuit board 25.
The circuit board 25 and the wiring boards 24a and 24b are arranged at positions not to cross the see-through portions 23a and 23b.

When the main body 11 is worn, the liquid crystal display 18
The left and right images displayed on a and 18b and illuminated by the backlights 19a and 19b enter the prism units 12a and 12b, respectively, are repeatedly reflected, and can be viewed with the eye E.

At this time, for example, if the head is tilted to the right, the main body 11 is also tilted to the right, but the prism unit 12a,
12b is rotated by the weight of the weight 22 around the bearings 15a and 15b and is kept horizontal. Therefore, as shown in FIG. 3, the display screen section 31 seen from the prism unit 12 can be viewed with a natural feeling without being inclined with respect to the background seen from the see-through sections 32 and 33.

At this time, the distance between the rotating shaft 16a and the shaft 20a is equal to the distance between the rotating shaft 16b and the shaft 20b.
An important condition is the parallelogram relationship that the distance between a and 16b is equal to the distance between the axes 20a and 20b. If this relationship is broken, the images obtained from the left and right prism units 12a and 12b will not be fused, and the function of the HMD will not be satisfactory. Also, the rotating shafts 16a, 16b and the bearings 15a,
It is preferred that the engagement of 15b be kept to a minimum.

The weights 22 may be individually attached to the prism units 12a and 12b without using the connecting member 21, and the weights 22 may be maintained parallel to each other.

[0017]

As described above, according to the head-mounted display device of the present invention, even if the head is tilted in the mounted state, the display screen appears to be fixed with respect to the background image. Thus, the user can feel as if he / she is watching a fixed television screen in a room, and can display images that are natural and comfortable.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of an embodiment.

FIG. 2 is a sectional view taken along the line A-A 'of FIG.

FIG. 3 is an explanatory diagram of how a display unit looks.

FIG. 4 is an explanatory diagram of how a conventional display unit looks.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Main body 15a, 15b Bearing 16a, 16b Rotation axis 12a, 12b Prism unit 18a, 18b Liquid crystal display panel 19a, 19b Backlight 20a, 20b Axis 21 Connecting member 22 Weight 23a, 23b See-through window

Claims (4)

[Claims] 1. A display screen for displaying a liquid crystal screen is housed in a main body, a rotation axis substantially coincident with a line-of-sight direction is provided at a substantially central portion of the display screen, and the display screen is centered on the rotation axis. A head-mounted display device, wherein the head-mounted display device is rotatable with respect to the main body, and a weight is attached to a lower portion of the display screen portion. 2. A left and right independent display screen portion for displaying a liquid crystal screen and corresponding to the left and right eyes is housed in a main body, and a rotation axis substantially coincident with a line of sight is provided at a substantially central portion of each of the display screen portions. Each of the display screen portions is rotatable with respect to the main body around the rotation axis, a shaft is provided at a lower portion of each of the display screen portions, these shafts are connected by a connecting member, and a weight is attached to the connecting member. A head-mounted display device, characterized in that: 3. A right side of the display screen corresponding to a right eye,
The head-mounted display device according to claim 2, wherein a see-through portion is provided on a left side of the display screen portion corresponding to a left eye so as to be able to see an external background. 4. A liquid crystal display panel to be displayed on the display screen unit and a mounting board for controlling a backlight lighting circuit are connected by a flexible mounting wiring board rotatable together with the display screen unit. The head-mounted display device according to claim 2.