WO2016137033A1

WO2016137033A1 - Head mounted display device

Info

Publication number: WO2016137033A1
Application number: PCT/KR2015/001857
Authority: WO
Inventors: 박수원
Original assignee: 주식회사 테라클
Priority date: 2015-02-26
Filing date: 2015-02-26
Publication date: 2016-09-01

Abstract

A head mounted display device is disclosed. The head mounted display device comprises: a display panel; a magnifying lens unit for magnifying image light emitted from the display panel; and an optical path modification unit for modifying the path of the image light, which has been magnified by the magnifying lens unit, through a plurality of polyhedron prisms such that the same is imaged on the user's eyes, wherein the optical path modification unit comprises: a first prism having a first surface treated with a convexly curved surface, which is capable of reflection, so as to image the magnified image light on the user's eyes; and a second prism having a second surface treated with a partially reflecting surface such that the image light, which has been magnified by the magnifying lens unit, is reflected, or the image light, which has been reflected by the first surface of the first prism, is transmitted. Accordingly, the optical path is modified using polyhedron prisms, instead of modifying the optical path using a transmitting mirror or a reflecting mirror; as a result, the structure of the head mounted display device is simplified, and errors during the manufacturing process can be reduced; light enters a vacuum state, which has a small refractive index, or air from inside a prism, which has a large refractive index, and then enters the user's eyes; and, as a result, it is possible to implement a wide FOV (field of view), to reduce the distance from the prisms to the user's eyes, and to make the head mounted display device compact.

Description

Head mounted display devices

The present invention relates to a head mounted display device capable of viewing an image generated in a display panel while a user wears it on a head or face.

The head mounted display device refers to a device that magnifies image light formed in a display panel by an optical system and then forms an image on a user's eyes. These head mounted display devices require precise optical design that focuses on short distances because display panels are located close to the user's eyes. Research is underway to reduce the rejection of the city.

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, components are protruded in the line of sight, and as a result, a user who wears the center of gravity is largely separated from the face to the front. It was true that it provided fatigue and rejection.

In order to solve this problem, techniques for changing the optical path such that the display panel and the optical system are not positioned in a straight line have been proposed, but most of them are implemented by changing the optical path using transmission and concave reflecting mirrors, resulting in complicated structure. There are many errors in the manufacturing process, making it difficult to secure quality, and most of all, it is difficult to secure a wide field of view (FOV) in the optical design because the medium on the optical path is air.

The present invention has been made to solve the above problems, an object of the present invention is to use a plurality of polyhedral prism to change the optical path, to ensure a wide FOV to volume and to simplify the structure according to the display type The present invention provides a head mounted display device which can be changed and minimizes errors in the manufacturing process.

According to one or more exemplary embodiments, a head mounted display device includes: a display panel; An enlarged lens unit for enlarging the image light emitted from the display panel; And a light path changing unit for changing the path of the image light enlarged by the magnification lens unit to form an image in a user's eye through a plurality of polyhedral prisms, wherein the light path changing unit is configured to receive the enlarged image light. A first prism with a first surface treated with a convex curved surface that is partially reflective to form an image in the eye of the user; A second prism on which a second surface is treated as a partial reflection surface so that the image light enlarged by the magnifying lens unit is reflected or the 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 directions of the closely formed surfaces have an angle of 0 degrees to each other, and the first surface and the second prism. All surfaces other than the surface are formed to be partially or partially transmissive such that an external image on the user's eyes together with the enlarged image light is formed in the eyes of the user, and the at least one additional prism is When the angle between the direction in which the image light is emitted and the direction of the line of sight of the user is an angle other than 90 degrees, the light path is further changed so that the enlarged image light and the external image are formed in the eyes of the user. Then, the scale of the image light emitted from the second prism is adjusted.

Herein, the first prism or the second prism may have a field of view (FOV) of the image light emitted from the optical path changing unit so as to widen or a distance from the optical path changing unit to the eye of the user. It may be formed of a glass or plastic material having a refractive index greater than that of vacuum or air.

In addition, when the light path changing unit includes only the first prism and the second prism, the eye line direction of the user and the normal line direction of the display panel may have angles other than 0 degrees and 180 degrees.

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

The first surface of the second prism is formed to face the first surface of the first prism so that the normal direction of the first surface of the second prism and the normal direction of the first surface of the first prism are coincident 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 degrees or 90 degrees, and the normal direction of the third surface of the second prism and the second of the second prism. The normal direction of the face may have an angle of 90 degrees.

When the light path changing unit is designed such that the image light enlarged by the magnifying lens unit enters the first prism and then enters the second prism and is finally formed in the user's eyes, the magnifying lens unit enlarges the image light. The first image light is transmitted through a third surface of the first prism, the normal direction of which has a 0 degree angle with the normal direction of the display panel; A second process reflected from the first surface of the second prism in close contact with the first surface of the first prism; A third process of reflecting from the second surface of the first prism, the normal direction having an angle of 90 degrees with the normal direction of the display panel; A fourth process of transmitting the first surface of the first prism and the first surface of the second prism; And a fifth process of transmitting a third surface of the second prism having a normal direction having an angle of 90 degrees with a normal direction of the display panel.

The third surface of the second prism may be formed as a concave curved surface so that the FOV of the image light is widened or the distance from the second prism to the user's eye is shortened.

In addition, when the optical path changing unit is designed such that the image light enlarged by the magnifying lens unit enters the second prism and then enters the first prism and is finally formed in the user's eye, the magnifying lens unit enlarges the image light. The first image light is transmitted through a second surface of the second prism or a third surface of the second prism, the normal direction of which has a 0 degree angle with the normal direction of the display panel; A second process of transmitting the first surface of the second prism in close contact with the first surface of the first prism and the first surface of the first prism; A third process of reflecting from the second surface of the first prism having a normal direction having an angle of 0 degrees with the normal direction of the display panel; A fourth process reflected from the first surface of the second prism; And a fifth process of transmitting a third surface of the first prism having a normal direction having an angle of 90 degrees with a normal direction of the display panel.

Thus, by changing the optical path using a polyhedral prism without changing the optical path using the transmission or reflecting mirror, the structure is simplified and the error in the manufacturing process can be reduced. Since the refractive index enters the user's eyes by entering a vacuum or air with a small refractive index, it is possible to implement a wide field of view (FOV), and to reduce the distance from the prism to the user's eyes. Miniaturization can be achieved.

1 is a view provided to explain a head mounted display device according to an embodiment of the present invention.

2 is a view provided to explain a head mounted display device according to another embodiment of the present invention.

3 is a view showing a perspective view of a first prism used in the second embodiment.

4 is a diagram showing a perspective view of a second prism used in the second embodiment.

FIG. 5 is a diagram provided to explain an optical path based on the second embodiment.

6 is a view provided to explain an example in which the optical path is changed by using an additional prism.

FIG. 7 is a diagram provided to explain another example of changing an optical path using an additional prism.

FIG. 8 is a diagram provided to explain another example of changing an optical path using an additional prism.

Hereinafter, with reference to the drawings will be described in more detail with respect to the present invention. Details 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. 2. Next, the processing state and role of each side of the first prism will be described with reference to FIG. 3, and the processing state and role of each side of the second prism will be described with reference to FIG. 4. Hereinafter, an optical path based on the second embodiment will be described with reference to FIG. 5, and an example of changing an optical path using an additional prism will be described with reference to FIGS. 6 to 8.

1 is a view provided to explain a head mounted display (HMD) device according to an embodiment of the present invention.

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

According to the head mounted display device according to the present embodiment, a wide field of view (FOV) is secured by using a plurality of prisms without using a reflecting mirror or a transmitting mirror, and a light path change and between a light path changing unit and a user's eyes are used. By reducing the distance, the device can be miniaturized.

The head mounted display device according to the present exemplary 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 as various devices or devices, such as a liquid crystal display (LCD), organic light emitting diodes (OLED), liquid crystal on silicon (LCoS), and the like. In addition, a separate light source may be disposed around the display panel 100, and may be provided in a small size for miniaturization, ultra-thinness, and lightweight of the head mounted display device.

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

As described above, the magnification lens unit 200 is used for the purpose of enlarging the image light emitted from the small size display panel 100. To this end, the enlarged lens unit 200 may be formed of two or more lens groups, and each lens forming the lens group may include a single-sided concave lens, a single-sided convex lens, a double-sided concave lens, and a double-sided convex lens.

The image light magnified by the magnification lens unit 200 is changed in a path and finally formed in the user's eye 500. An optical path changing unit is used to change the path. The light path changing unit includes a first prism 300 and a second prism 400.

In addition, the light path changing unit may further configure an additional prism.

The first prism 300 is a polyhedron formed of a glass material or a plastic material, and the image light is reflected, transmitted, partially reflected, or partially transmitted from each surface of the first prism 300. In addition, the first prism 300 is characterized by having one convex surface and one oblique surface, a detailed description of each surface will be described 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 from each surface of the second prism 400. In addition, the second prism 400 is characterized by having one concave surface and one oblique surface, a detailed description of each surface will be described later.

On the other hand, the first prism 300 and the second prism 400 are formed to be in close contact with each other such that the bevel angle (θ ') is equal to each other, so that the normal direction of the faces that are formed to face the opposite contact is 0 degrees Will have an angle.

The oblique surface of the second prism 400 is surface-treated to have a light transmittance of 50% to partially reflect or partially transmit the incident image light. Accordingly, the image light emitted from the display panel 100 and incident on the first prism 300 through the magnification lens unit 200 is partially reflected to change from the light path of R11 to the light path of R12, and the rest The light is transmitted to change 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 light path of R12 is partially reflected to be changed to the light path of R14. Of course, even in this case, since the oblique side of the second prism 400 is surface-treated to have a light transmittance of 50%, the optical path will be changed to be reflected toward the display panel 100.

In summary, the optical path changing unit is formed such that all the surfaces except for the concave surface of the first prism 300 and the one concave surface of the second prism 400 are partially or partially transmissive so that an external image is visible to the user. It is possible to implement a see-through head mounted display device by allowing the user to form an image.

The image light changed to the light 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 may be implemented to allow transmission.

On the other hand, when the image light is formed in the user's eye 500 through the light path of R14, the user can view the image light. In addition, all of the concave surfaces of the second prism 400 may be transmitted, some of the bevel surfaces of the second prism 400 may be transmitted, and all of the bevel surfaces of the first prism 300 may be transmitted. Since the convex surface of the prism 300 is partially permeable, it is possible to observe objects on the user's gaze beyond the worn head mounted display device. This enables the implementation of a see-through head mounted display device.

Second Embodiment

2 is a view provided to explain a head mounted display device according to another embodiment of the present invention. Hereinafter, a description will be given of a part that is distinguished from the head mounted display device described with reference to FIG. 1.

The head mounted display device according to the present embodiment also secures a wide FOV by using a plurality of prisms without using a reflecting mirror or a transmitting mirror, and reduces the distance between the light path changing unit and the distance between the light path changing unit and the user's eyes. Miniaturization can be achieved.

The head mounted display device according to the present embodiment, like the head mounted display device according to the first embodiment, has the display panel 100, the magnification lens unit 200, the first prism 300, and the second prism 400. It consists of. However, the positions of the first prism 300 and the second prism 400 have been changed, and the convex surfaces of the first prism 300 are all reflected and there is no concave surface of the second prism 400. It is distinguished from the first embodiment in that respect.

The head mounted display device according to the present embodiment may further configure an additional prism similarly to the head mounted display device according to 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.

It may also include at least one additional prism.

Through this, the light path changing unit is formed such that all but part of the block except for the concave surface of the first prism 300 and one oblique surface of the second prism 400 may be partially or partially transmitted to the external image in the line of sight of the user. It is possible to implement a see-through head mounted display device by allowing the user to form an image.

On the other hand, the first prism 300 and the second prism 400 are also formed in close contact with each other such that the bevel angles (θ '') are equal to each other, so that the normal directions of the oppositely formed surfaces are mutually zero. It will have a degree angle.

The oblique surface of the second prism 400 is surface-treated to have a light transmittance of 50% to partially reflect or partially transmit the incident image light. Accordingly, the image light emitted from the display panel 100 and incident on the second prism 400 through the magnifying lens part 200 is partially reflected to change from the light path of R21 to the light path of R22, and the rest It is transmitted to change from the optical path of R21 to the optical path of R23.

The convex surface of the first prism 300 is surface treated to have a light reflectance of 100% to reflect all incident image light. Accordingly, all the light incident on the convex surface along the light path of R23 is reflected to be changed to the light path of R24.

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

On the other hand, when the image light is formed in the user's eye 500 through the optical path of R25, the user can view the image light. In addition, the surface of the first prism 300 penetrated by the light path of R25 and the surface of the second prism 400 penetrated by the light path of R22 are both permeable and oblique of the second prism 400. Since the surface is partially permeable and all the oblique surfaces of the first prism 300 are permeable, observation of objects on the user's line of sight over the worn head mounted display device is also possible. This enables the implementation of a see-through head mounted display device.

3 is a view showing a perspective view of the first prism 300 used in the second embodiment, Figure 4 is a view showing a perspective view of the second prism 400 used in the second embodiment, Based on the second embodiment, processing states and roles of the first prism 300 and the second prism 400 will be described. The processing states and roles of the first prism 300 and the second prism 400 used in the first embodiment may be inferred from the parts described below with reference to the second embodiment.

S11 refers to the oblique side of the first prism 300 described above, and S21 refers to the oblique side of the second prism 400 described above.

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

In addition, S11 is not subjected to a special surface treatment or processed to have a transmittance of 100% to be used in the same manner as in the first or second embodiment described above, S21 is surface-treated to have a transmittance of 50% Again, the same can be used in the above-described first or second embodiment.

Of course, it is assumed above that S11 has a transmittance of 100% and S21 has a transmittance of 50%, but it is merely an example for convenience of explanation, and both have 62.5% transmittance and 80% transmittance, respectively. Even if it is surface-treated so that it has a total transmittance of 50% can be equally applied.

In addition, it may be assumed that the transmittance of the portion where S11 and S21 are in close contact is set to a value other than 50%, and further, the first prism 300 and the second prism 400 are integrated. And it may be assumed that the implementation to insert a material that reduces the transmittance therein.

On the other hand, S12 may be surface-treated with a different transmittance depending on the embodiment. For example, in the first embodiment, S12 is surface treated to have a transmittance of 50% for the implementation of the see-through head mounted display device, while in the second embodiment, more sufficient image light is provided to the eyes 500 of the user. It can be surface treated to be totally reflective in order to be able to be.

Of course, this is also merely illustrative, and the technical spirit of the present invention is maintained even when the first embodiment is treated to have a transmittance other than 50% and the second embodiment is treated to have a transmittance other than 0%. Could be applied.

In addition, the normal direction of S12 has an angle of 90 degrees with the normal direction of the display panel 100 in the first embodiment, and has an angle of 0 degree 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 may be treated as flat surfaces having a transmittance of 100%, while in the first embodiment, S23 is treated as a concave surface having a 100% transmittance. In a second embodiment, S23 may be treated with a flat surface having 100% transmittance.

In addition, the normal direction of S13 has an angle of 0 degrees with the normal direction of the display panel 100 in the first embodiment, and has 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 the normal direction of the display panel 100 in the first embodiment, and has 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 the normal direction of the display panel 100 in the first embodiment, and has an angle of 0 degree with the normal direction of the display panel 100 in the second embodiment.

The image light generated by the display panel 100 is magnified through the magnification lens unit 200 consisting of two lenses, and the image light is refracted by the two

prisms

300 and 400 to the user's eye 500. It is missing.

In particular, referring to the enlarged drawing, a phenomenon occurs in which the incident light is incident at the incident angle α and refracted at the refractive angle β between the first prism 300 using glass or plastic as a medium and the outside using vacuum or air as a medium. Done. This is because the refractive index of the medium of the first prism 300 is larger than the external refractive flow.

As such, since the optical path is changed by using the

prism

300 or 400 without changing the optical path by using the transmission or reflecting mirror, the refractive angle β becomes larger than the incident angle α, which results in a wide field of view (FOV). In this case, the distance from the prism 300 to the user's eyes can be reduced, thereby miniaturizing the head mounted display device.

6 through 8 are views provided to explain examples of changing an optical path by utilizing an additional prism.

As shown in the illustrated examples, two or more prisms may be used to freely change an optical path transmitted from the display panel 100 to the user's eye 500.

FIG. 6 illustrates the direction of the eye of the user's eye 500 when the normal direction of the display panel 100 is parallel to the X axis, using the prism A 610, the prism B 620, and the prism C 630. 7 is an example in which the axis is parallel to each other, and FIG. 7 illustrates the use of the prism D 640, the prism E 650, and the prism F 660, when the normal direction of the display panel 100 is parallel to the Z axis. The eye line 500 is an example in which the eye direction is parallel to the Y axis, and FIG. 8 illustrates the normal direction of the display panel 100 using the prism G 670, the prism H 680, and the prism I 690. In the case of parallel to the Y-axis, the eye gaze direction of the user 500 is an example implemented to be parallel to the Y-axis.

In summary, the present invention includes an additional prism so that the light path is further changed when the angle between the direction in which the image light is emitted and the direction of the user's trial is other than 90 degrees so that the image light is emitted and the user The enlarged image light and the external image can be formed in the eyes of the user without being limited to the angle between the directions of the trials.

In addition, the present invention can adjust the scale of the image light emitted through the second prism through the additional prism.

In addition, the present invention, by changing the optical path by using an additional prism without changing the optical path by using the transmission or reflecting mirror, the structure is simplified and the error in the manufacturing process can be reduced, the light has a large refractive index Since the inside of the prism enters a vacuum or air with a small refractive index and enters the user's eyes, the field of view (FOW) can be implemented, and the distance from the prism to the user's eyes can be reduced, thereby providing a head mounted display. The device can be miniaturized, and an external image on the user's eyes can be formed in the eyes of the user, thereby enabling the implementation of a see-through head display device. The enlarged image light may be formed on the eyes of the user regardless of the direction of the line of sight.

While the above has been shown and described with respect to preferred embodiments of the present invention, the present invention is not limited to the specific embodiments described above, it is usually in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

Claims

In the head mounted display device,

Display panel;

An enlarged 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 magnification lens unit to form an image in a user's eye through a plurality of polyhedral prisms.

The light path changing unit,

A first prism having a first surface treated with a convex curved surface that is partially reflective to form the enlarged image light in the eyes of the user;

A second prism on which a second surface is treated as a partial reflection surface so that the image light enlarged by the magnifying lens unit is reflected or the image light reflected by the first surface of the first prism is transmitted; And

At least one additional prism;

The first prism and the second prism are formed in close contact with each other so that the normal directions of the closely formed surfaces have an angle of 0 degrees to each other, and all the surfaces except for the first and second surfaces are partially or partially transmitted. It is formed to enable the external image on the user's eyes with the magnified image light to form in the eyes of the user,

The at least one additional prism,

When the angle between the direction in which the image light is emitted and the direction of the line of sight of the user is an angle other than 90 degrees, the light path is further changed so that the enlarged image light and the external image are imaged in the eyes of the user. And adjust the scale of the image light emitted from the second prism.
The method of claim 1,

The first prism or the second prism,

Glass or plastic material having a larger refractive index than vacuum or air in order to widen the field of view (FOV) of the image light emitted from the optical path changing unit or to shorten the distance from the optical path changing unit to the user's eyes. Head mounted display device, characterized in that formed.
The method of claim 1,

When the light path changing unit is composed of only the first prism and the second prism, the head-mount display of the eye of the user and the normal direction of the display panel have angles other than 0 degrees and 180 degrees. Device.
The method of 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 degrees 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 degrees or 90 degrees,

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.
The method of claim 4, wherein

The first surface of the second prism is formed to face the first surface of the first prism so that the normal direction of the first surface of the second prism coincides with the normal direction of the first surface of the first prism,

The normal direction of the second surface of the second prism and the normal direction of the display panel have an angle of 0 degrees or 90 degrees,

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 of claim 1,

When the optical path changing unit is designed such that the image light enlarged by the magnifying lens unit enters the first prism and then enters the second prism and finally forms an image on the eyes of the user,

The image light enlarged by the magnifying lens unit,

A first process of transmitting a third surface of the first prism having a normal direction at an angle of 0 degrees to a normal direction of the display panel;

A second process reflected from the first surface of the second prism in close contact with the first surface of the first prism;

A third process of reflecting from the second surface of the first prism, the normal direction having an angle of 90 degrees with the normal direction of the display panel;

A fourth process of transmitting the first surface of the first prism and the first surface of the second prism; And

And a fifth process of transmitting the third surface of the second prism having a normal direction at an angle of 90 degrees to the normal direction of the display panel.
The method of claim 6,

The third surface of the second prism,

And a concave curved surface so that the FOV of the image light is widened or the distance from the second prism to the user's eye is shortened.
The method of claim 1,

When the light path changing unit is designed such 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 eyes of the user,

The image light magnified by the magnifying lens unit,

A first process of transmitting a second surface of the second prism or a third surface of the second prism having a normal direction at an angle of 0 degrees to the normal direction of the display panel;

A second process of transmitting the first surface of the second prism in close contact with the first surface of the first prism and the first surface of the first prism;

A third process of reflecting from the second surface of the first prism having a normal direction having an angle of 0 degrees with the normal direction of the display panel;

A fourth process reflected from the first surface of the second prism; And

And a fifth process of transmitting the third surface of the first prism having a normal direction at an angle of 90 degrees to the normal direction of the display panel.