KR101478424B1 - Apparatus for head mount display - Google Patents

Abstract

A head mount display device is disclosed. The head-mounted display device includes a display panel; An enlargement lens unit for enlarging the image light emitted from the display panel; And an optical path changing unit for changing a path of the image light enlarged by the enlargement lens unit and forming an image on a user's eye through a plurality of polyhedral prisms, A first prism having a first surface processed with a reflective convex surface to form an image on the user's eye; And a second prism in which the second surface is treated as a partial reflecting surface so that image light magnified by the magnifying lens portion is reflected or image light reflected by the first surface of the first prism is transmitted. Thus, by changing the optical path using the polyhedron prism without changing the optical path using the transmitted light or the reflector, the structure of the head-mounted display device can be simplified, errors in the manufacturing process can be reduced, A large FOV (Field Of View) can be realized and a distance from the prism to the user's eye can be reduced since the inside of the large prism enters a vacuum state with a small refractive index or air and enters the user's eye It is possible to reduce the size of the head mount display device.

Description

[0001] APPARATUS FOR HEAD MOUNT DISPLAY [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head-mounted display device capable of viewing an image generated on a display panel while a user wears it on a head or a face.

The head mount display device refers to a device that magnifies image light formed on a display panel by an optical system and forms an image on the user's eyes. Such a head-mounted display device requires a precise optical design that focuses at a short distance because the display panel is positioned close to the user's eyes. In addition to research to solve these requirements, Studies are underway to reduce the sense of rejection of poetry.

However, in the conventional head-mounted display device, since the display panel and the optical system are positioned on the optical axis in a straight line, the components are protruded in the eye direction, so that the center of gravity deviates considerably from the face to the front, It is true that they provided fatigue and resistance.

Techniques for changing the optical path so that the display panel and the optical system are not positioned in a straight line in order to solve this problem have been proposed. However, most of them are implemented by changing the optical path using the transmitted light and concave reflector, There is a problem in that it is difficult to obtain a wide field of view (FOV) due to optical design because the medium of the optical path is air.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an image display device and a display device, which are capable of changing a light path by using a plurality of polyhedral prisms, And a head mount display device for minimizing an error in a manufacturing process.

According to an aspect of the present invention, there is provided a head-mounted display device including: a display panel; An enlargement lens unit for enlarging the image light emitted from the display panel; And an optical path changing unit for changing a path of the image light enlarged by the enlargement lens unit and forming an image on a user's eye through a plurality of polyhedral prisms, A first prism having a first surface processed with a reflective convex surface to form an image on the user's eye; And a second prism in which the second surface is treated as a partial reflecting surface so that image light magnified by the magnifying lens portion is reflected or image light reflected by the first surface of the first prism is transmitted.

Here, the first prism or the second prism may be configured such that the FOV (field of view) of image light emitted from the light path changing unit is widened or the distance from the light path changing unit to the user's eye is shortened , A vacuum or a glass or plastic material having a refractive index higher than that of air.

Also, when the light path changing unit includes only the first prism and the second prism, the viewing direction of the user's eye and the normal direction of the display panel may have angles other than 0 degree and 180 degrees.

The normal direction of the first surface of the first prism and the normal direction of the display panel have an angle other than 0 degrees and 90 degrees and the normal direction of the second surface of the first prism and the normal direction of the display panel Direction may have an angle of 0 degrees or 90 degrees and a normal direction of the third surface of the first prism and a normal direction of the second surface of the first prism may have an angle of 90 degrees.

The first surface of the second prism may be formed to face the first surface of the first prism such that the normal direction of the first surface of the second prism and the normal direction of the first surface of the first prism coincide with each other Wherein the normal direction of the second surface of the second prism and the normal direction of the display panel have an angle of 0 degree or 90 degrees and the normal direction of the third surface of the second prism and the second direction of the second prism The normal direction of the face may have an angle of 90 degrees.

When the optical path changing unit is designed so that the image light enlarged by the magnifying lens unit enters the first prism and then enters the second prism and is finally imaged on the eye of the user, A first process of transmitting the image light through the third surface of the first prism, the normal direction of the image light having an angle of 0 degree with respect to a normal direction of the display panel; A second step of reflecting light from a first surface of the second prism which is in close contact with a first surface of the first prism; A third step in which a normal direction is reflected by a second surface of the first prism, the first direction being perpendicular to the normal direction of the display panel; A fourth step of transmitting the first surface of the first prism and the first surface of the second prism; And a fifth step of transmitting a third surface of the second prism, the normal direction of which has an angle of 90 degrees with respect to the normal direction of the display panel.

Here, the third surface of the second prism may be formed as a concave surface to widen the FOV of the image light or shorten the distance from the second prism to the eye of the user.

When the light path changing portion is designed so that the image light enlarged by the magnifying lens portion enters the second prism and then enters the first prism and is finally imaged on the eye of the user, A first process of transmitting the image light through the second surface of the second prism or the third surface of the second prism, the normal direction of which has an angle of 0 degree with respect to the normal direction of the display panel; A second step of passing through the first surface of the first prism and the first surface of the second prism in close contact with the first surface of the first prism; A third step in which a normal direction is reflected by a second surface of the first prism, the angle of which is 0 degree with respect to a normal direction of the display panel; A fourth step of reflecting light from the first surface of the second prism; And a fifth step of transmitting a third surface of the first prism having a normal direction at an angle of 90 degrees with respect to a normal direction of the display panel.

In this way, by changing the optical path using the polyhedron prism without changing the optical path using the transmitted light or the reflector, the structure becomes simple and error in the manufacturing process can be reduced. In the prism having a large refractive index, It is possible to implement a wide field of view (FOV) because the refractive index enters into a vacuum state or into the air and enter the user's eye, and the distance from the prism to the user's eye can be reduced. And miniaturization can be achieved.

1 is a view for explaining a head-mounted display device according to an embodiment of the present invention.
2 is a view for explaining a head-mounted display device according to another embodiment of the present invention.
3 is a perspective view of the first prism used in the second embodiment.
4 is a perspective view of a second prism used in the second embodiment.
FIG. 5 is a view for explaining an optical path based on the second embodiment. FIG.
Fig. 6 is a view provided to explain an example in which an optical path is changed by utilizing an additional prism. Fig.
Figure 7 is a view provided to illustrate another example of using an additional prism to change the optical path.
Figure 8 is a view provided to illustrate another example of using an additional prism to change the optical path.

Hereinafter, the present invention will be described in detail with reference to the drawings. The contents to be described below are as follows.

First, a first embodiment of the present invention will be described with reference to FIG. 1, and a second embodiment of the present invention will be described with reference to FIG. Next, the processing state and role of each surface of the first prism will be described with reference to FIG. 3, and the processing state and role of each surface of the second prism will be described with reference to FIG. Hereinafter, the optical path based on the second embodiment will be described with reference to FIG. 5, and an optical path modification example using the additional prism will be described with reference to FIGS. 6 to 8. FIG.

≪ Embodiment 1 >

1 is a view for explaining a head mount display (HMD) device according to an embodiment of the present invention.

As is well known, a head-mounted display device refers to a device that is worn on a user's head or face to cause image light to be imaged on the user's eyes.

According to the head-mounted display device according to this embodiment, a wide field of view (FOV) can be ensured by using a plurality of prisms without using a reflecting mirror or a light path, and the light path changing and light path changing unit Thereby reducing the size of the apparatus.

The head-mounted display device according to the present embodiment includes a display panel 100, an enlarged lens unit 200, a first prism 300, and a second prism 400.

The display panel 100 may be implemented by various devices or devices such as a liquid crystal display (LCD), an organic light emitting diode (OLED), and a liquid crystal on silicon (LCoS). Further, a separate light source can be disposed around the display panel 100, and the head-mounted display device can be provided in a small size for miniaturization, ultra thinning, light weight, and the like.

The image light emitted from the display panel 100 is incident on the magnifying lens unit 200.

The enlarged lens unit 200 is used for enlarging the image light emitted from the display panel 100 of a small size as described above. For this, the magnifying lens unit 200 may be formed of two or more lens groups, and each of the lenses forming the lens group may be composed of a concave-convex lens, a convex convex lens, a double-convex concave lens or a double convex convex lens.

The image light enlarged by the magnifying lens unit 200 is changed in path and finally imaged on the eye 500 of the user and a light path changing unit is used for such a path changing. The light path changing unit is composed of a first prism 300 and a second prism 400.

The first prism 300 is a polyhedron formed of a glass material or a plastic material, and image light is reflected, transmitted, partially reflected, or partially transmitted on each side of the first prism 300. Also, the first prism 300 has one convex surface and one oblique surface, and a detailed description of each surface will be given later.

The second prism 400 is also a polyhedron formed of a glass material or a plastic material, and image light is reflected, transmitted, partially reflected or partially transmitted on each side of the second prism 400. In addition, the second prism 400 has one concave surface and one oblique surface, and a detailed description of each surface will be given later.

On the other hand, the first prism 300 and the second prism 400 are formed in such a manner that oblique faces are opposite to each other such that the opposing angles? 'Are equal to each other, Angle.

The oblique surface of the second prism 400 is surface-treated so as to have a light transmittance of 50% to partially reflect or partially transmit incident image light. The image light emitted from the display panel 100 and incident on the first prism 300 through the enlarged lens unit 200 is partially reflected and changed from the optical path of R11 to the optical path of R12, And is changed from the optical path of R11 to the optical path of R13.

The convex surface of the first prism 300 is surface-treated to have a light reflectance of 50% to partially reflect or partially transmit incident image light. Accordingly, the light incident on the convex surface along the optical path of R12 is partially reflected and changed to the optical path of R14. Of course, also in this case, since the oblique surface of the second prism 400 is surface-treated so as to have a light transmittance of 50%, the light path will be partially changed so as to be reflected toward the display panel 100 side.

The image light changed to the optical path of R14 passes through the concave surface of the second prism 400 and the concave surface of the second prism 400 at this time can be made to be entirely transmissible.

On the other hand, if the image light is imaged on the user's eye 500 through the optical path of R14, the user can view the image light that has been formed. In addition, the concave surface of the second prism 400 is entirely transmissive, the oblique surface of the second prism 400 is partially transmissive, the oblique surface of the first prism 300 is entirely transmissive, Since the convex surface of the prism 300 is partially transmissive, it becomes possible to observe objects on the line of sight of the user beyond the wearing head-mounted display device. This allows the implementation of a see-through head-mounted display device.

≪ Embodiment 2 >

2 is a view for explaining a head-mounted display device according to another embodiment of the present invention. Hereinafter, a description will be given mainly of a part different from the head-mounted display device described in Fig.

The head-mounted display device according to the present embodiment can also ensure a wide FOV by using a plurality of prisms without using a reflector or a light path, and can reduce the distance between the light path changing portion and the light path changing portion and the user's eyes Thereby making it possible to achieve miniaturization.

The head-mounted display device according to the present embodiment is similar to the head-mounted display device according to the first embodiment except that the display panel 100, the enlargement lens part 200, the first prism 300 and the second prism 400, . It should be noted that the positions of the first prism 300 and the second prism 400 are changed and that the convex surface of the first prism 300 is completely reflected and that the concave surface of the second prism 400 is not present Which is distinguished from the first embodiment.

That is, the first prism 300 has one convex surface and one oblique surface, and the second prism 400 has one oblique surface.

The first prism 300 and the second prism 400 are also formed so that the oblique surfaces of the first prism 300 and the second prism 400 are opposed to each other so that the vertex angles? '' Are equal to each other, .

The oblique surface of the second prism 400 is surface-treated so as to have a light transmittance of 50% to partially reflect or partially transmit incident image light. The image light emitted from the display panel 100 and incident on the second prism 400 through the magnifying lens unit 200 is partially reflected and changed from the optical path of R21 to the optical path of R22, And is changed from the optical path of R21 to the optical path of R23.

The convex surface of the first prism 300 is surface-treated so as to have a light reflectance of 100% to totally reflect the incident image light. Accordingly, the light incident on the convex surface along the optical path of R23 is totally reflected and changed to the optical path of R24.

The image light changed to the optical path of R24 is partially reflected on the oblique surface of the second prism 400 and has the optical path of R25 and is imaged on the eye 500 of the user. Of course, also in this case, since the oblique surface of the second prism 400 is surface-treated to have a light transmittance of 50%, the light path will be changed so that a part thereof is transmitted to the display panel 100 side.

On the other hand, if image light is imaged on the user's eye 500 through the optical path of R25, the user can view the image light that has been formed. In addition, the surface of the second prism 400 penetrating by the optical path of R22 and the surface of the first prism 300 passing through the optical path of R25 is entirely transmissive, and the surface of the second prism 400, Since the oblique surface of the first prism 300 is entirely transmissive, it is possible to observe objects on the user's gaze beyond the wearing head-mounted display device. Thereby realizing a perspective type head-mounted display device.

≪ Processing state and role of each surface in the first prism and the second prism >

FIG. 3 is a perspective view of a first prism 300 used in the second embodiment. FIG. 4 is a perspective view of a second prism 400 used in the second embodiment. The processing state and role of the first prism 300 and the second prism 400 will be described based on the second embodiment. The processing state and the role of the first prism 300 and the second prism 400 used in the first embodiment will be inferable from the portion described with reference to the second embodiment below.

S11 denotes an oblique plane of the first prism 300, and S21 denotes an oblique plane of the second prism 400 described above.

These S11 and S21 are formed so as to face each other so as to face each other. That is, the normal direction of S11 and the normal direction of S21 have an angle of 0 degree.

S11 is not subjected to any special surface treatment or is processed to have a transmittance of 100% so that it can be used in the same manner as in the first embodiment or the second embodiment described above, and S21 is surface-treated to have a transmittance of 50% It can be equally used in the first embodiment or the second embodiment described above.

Of course, it is assumed that S11 has a transmittance of 100% and S21 has a transmittance of 50%. However, it is only an example for convenience of explanation, and both have a transmittance of 62.5% and a transmittance of 80% Even if it is surface-treated so as to have a transmittance of 50% as a whole.

In addition, it may be assumed that the transmissivity of the portion where S11 and S21 are in close contact is set to a value other than 50%. Further, the first prism 300 and the second prism 400 may be integrated And a material for reducing the transmittance is inserted inside.

On the other hand, S12 can be surface-treated with different transmittance according to the embodiment. For example, in the first embodiment, S12 is surface-treated to have a transmittance of 50% for the implementation of a perspective type head-mounted display device, but in the second embodiment, The surface can be surface-treated to be totally reflected.

Of course, this is also only an example, and even in the first embodiment, the transmittance is processed to have a transmittance other than 50%, and even in the second embodiment, even if the transmittance is other than 0%, the technical idea of the present invention .

The normal direction of S12 has an angle of 90 degrees with respect to the normal direction of the display panel 100 in the first embodiment and an angle of 0 degrees with the normal direction of the display panel 100 in the second embodiment.

In addition, in both the first embodiment and the second embodiment, S13 and S22 can be treated as a flat surface having a transmittance of 100%, and S23 in the first embodiment is treated as a concave surface having 100% transmittance In the second embodiment, S23 can be treated as a flat surface having 100% transmittance.

The normal direction of S13 has an angle of 0 degrees with respect to the normal direction of the display panel 100 in the first embodiment and an angle of 90 degrees with the normal direction of the display panel 100 in the second embodiment.

In addition, the normal direction of S22 has an angle of 0 degrees with respect to the normal direction of the display panel 100 in the first embodiment, and an angle of 90 degrees with the normal direction of the display panel 100 in the second embodiment.

The normal direction of S23 has an angle of 90 degrees with respect to the normal direction of the display panel 100 in the first embodiment and an angle of 0 degrees with the normal direction of the display panel 100 in the second embodiment.

<Sightseeing Route>

FIG. 5 is a view for explaining an optical path based on the second embodiment. FIG.

The image light generated in the display panel 100 is enlarged through an enlarged lens unit 200 composed of two lenses and this image light is refracted by the two prisms 300 and 400 to be reflected on the user's eyes 500 The image is formed.

In particular, referring to the enlarged drawing, a phenomenon occurs in which a first prism 300 made of glass or plastics is used as a medium and a light is incident at an incident angle? And refracted at a refraction angle? . This is because the refractive index of the medium of the first prism 300 is larger than that of the external refraction.

As described above, by changing the optical path using the prisms 300 and 400 without changing the optical path using the transmitted light or the reflector, the refraction angle [beta] becomes larger than the incident angle [alpha] And it is possible to reduce the distance from the prisms 300 and 400 to the eyes of the user, thereby miniaturizing the head-mounted display device.

<Example of application of additional prism>

Figs. 6 to 8 are views provided to explain examples in which an optical path is changed by utilizing an additional prism. Fig.

It is possible to freely change the optical path passing from the display panel 100 to the user's eyes 500 by using prisms other than the two prisms as shown in the illustrated examples.

6 illustrates a case where the viewing direction of the user's eye 500 is Y (vertical) when the normal direction of the display panel 100 is parallel to the X axis by using the prism A 610, the prism B 620, and the prism C 630. [ 7 shows a case where the normal direction of the display panel 100 is parallel to the Z axis by using the prism D 640, the prism E 650 and the prism F 660. In this case, 8 shows an example in which the viewing direction of the eye 500 is parallel to the Y axis and FIG. 8 shows an example in which the viewing direction of the eye 500 is parallel to the Y axis by using the prism G 670, the prism H 680, and the prism I 690. Axis direction is parallel to the Y-axis when the user's eye 500 is parallel to the Y-axis.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

100: display panel 200: magnification lens unit
300: first prism 400: second prism
500: user's eye 610: prism A
620: prism B 630: prism C
640: prism D 650: prism E
660: prism F 670: prism G
680: prism H 690: prism I
R11: first optical path (first embodiment) R12: second optical path (first embodiment)
R13: third optical path (first embodiment) R14: fourth optical path (first embodiment)
R21: first optical path (second embodiment) R22: second optical path (second embodiment)
R23: third optical path (second embodiment) R24: fourth optical path (second embodiment)
R25: Fifth optical path (second embodiment) S11: First surface of the first prism
S12: second surface of the first prism S13: third surface of the first prism
S21: first surface of second prism S22: second surface of second prism
S23: Third surface of the second prism alpha: Angle of incidence
β: Refraction angle

Claims (8)

A head-mounted display device comprising:
A display panel;
An enlargement lens unit for enlarging the image light emitted from the display panel; And
And a light path changing unit for changing the path of the image light enlarged by the enlargement lens unit through a plurality of polyhedral prisms to form an image on a user's eye,
The optical path changing unit,
A first prism having a first surface processed with a partially reflective convex surface to image the enlarged image light on the user's eye;
A second prism having a second surface processed with a partial reflection surface so that image light magnified by the magnifying lens unit is reflected or image light reflected by the first surface of the first prism is transmitted; And
At least one additional prism,
Wherein the first prism and the second prism are formed in close contact with each other so that the normal direction of the closely formed surfaces has an angle of 0 degree with respect to each other and all the surfaces except for the first surface and the second surface transmit So that an external image on the line of sight of the user together with the enlarged image light is imaged on the eye of the user,
Wherein the at least one additional prism comprises:
When the angle between the direction in which the image light is emitted and the direction of the user's gaze is an angle other than 90 degrees, the optical path is further changed so that the enlarged image light and the external image are imaged on the user &apos; And the scale of the image light emitted from the second prism is adjusted. The method according to claim 1,
The first prism or the second prism may include a first prism,
In order to widen the field of view (FOV) of the image light emitted from the light path changing unit or to shorten the distance from the light path changing unit to the user's eye, a vacuum state or a glass or plastic material And the head-mounted display device. The method according to claim 1,
Wherein the viewing direction of the eye of the user and the normal direction of the display panel have angles other than 0 degrees and 180 degrees when the optical path changing unit comprises only the first prism and the second prism. Device. The method according to claim 1,
The normal direction of the first surface of the first prism and the normal direction of the display panel have angles other than 0 degree and 90 degrees,
The normal direction of the second surface of the first prism and the normal direction of the display panel have an angle of 0 degree or 90 degrees,
Wherein the normal direction of the third surface of the first prism and the normal direction of the second surface of the first prism have an angle of 90 degrees. 5. The method of claim 4,
The first surface of the second prism is formed to face the first surface of the first prism such that the normal direction of the first surface of the second prism and the normal direction of the first surface of the first prism coincide with each other,
The normal direction of the second surface of the second prism and the normal direction of the display panel have an angle of 0 degree or 90 degrees,
Wherein the normal direction of the third surface of the second prism and the normal direction of the second surface of the second prism have an angle of 90 degrees. The method according to claim 1,
When the light path changing unit is designed so that the image light enlarged by the magnifying lens unit enters the first prism, enters the second prism, and finally forms an image on the eye of the user,
The image light, magnified by the magnifying lens unit,
A first step of transmitting a third surface of the first prism, the normal direction of which has an angle of 0 degree with respect to a normal direction of the display panel;
A second step of reflecting light from a first surface of the second prism which is in close contact with a first surface of the first prism;
A third step in which a normal direction is reflected by a second surface of the first prism, the first direction being perpendicular to the normal direction of the display panel;
A fourth step of transmitting the first surface of the first prism and the first surface of the second prism; And
And passing through a third surface of the second prism, the normal direction of which is at an angle of 90 degrees with respect to the normal direction of the display panel. The method according to claim 6,
And a third surface of the second prism,
Wherein a concave curved surface is formed to widen the FOV of the image light or to shorten the distance from the second prism to the eye of the user. The method according to claim 1,
When the light path changing unit is designed so that the image light enlarged by the magnifying lens unit enters the second prism and then enters the first prism and finally forms an image on the eye of the user,
The image light, magnified by the magnifying lens unit,
A first step of transmitting through a second surface of the second prism or a third surface of the second prism, the normal direction of which has an angle of 0 degrees with respect to a normal direction of the display panel;
A second step of passing through the first surface of the first prism and the first surface of the second prism in close contact with the first surface of the first prism;
A third step in which a normal direction is reflected by a second surface of the first prism, the angle of which is 0 degree with respect to a normal direction of the display panel;
A fourth step of reflecting light from the first surface of the second prism; And
And passing through a third surface of the first prism having a normal direction and an angle of 90 degrees with respect to a normal direction of the display panel.

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