KR20170021393A - Optical system for waveguide type head mounted display - Google Patents

Abstract

The present invention relates to an optical system for a head mounted display (HMD) in which image light emitted from a display is magnified and imaged on a wearer's eye. The optical system includes an incident prism on which image light emitted from the display is incident, And a partial reflection plate positioned between the incident prism and the exit prism. When the image light incident on the incident prism is reflected by the partial reflection plate, Mirror to reflect; And a curved mirror for magnifying the image light reflected by the mirror, wherein the image light expanded at the curved surface is reflected by the partial reflection plate, totally reflected by the exit prism and emitted to the wearer's eye, The present invention provides an optical system for a head mount display using a waveguide which is easy to acquire information while securing the acquired information and does not expose the obtained information to the front of the optical device and can obtain information of a large surface while significantly reducing volume and weight.

Description

[0001] The present invention relates to an optical system for a head mount display using a waveguide,

The present invention relates to an optical system for a head mount display, which is easy to acquire information while securing an external view, does not expose the acquired information to the front of the optical device, and significantly reduces volume and weight, And an optical system for a head mount display using a possible waveguide.

The head mounted display (HMD) is an image display device designed to allow a virtual large screen to be formed near the eyes of an image generated from an image source located very close to the eyes.

The HMD is a kind of wearable digital device that can receive multimedia contents by wearing on the head like glasses. The HMD has a closed type (see-closed type) and a transparent optical device (See-through type) that can acquire images while securing an external field of view.

In recent years, preference for transmissive HMD has been increasing as a means of acquiring information even during external activities, and development of miniaturization and lightweight of HMD has been demanded in accordance with the trend of miniaturization of digital devices.

However, since the transmissive HMD is designed to simultaneously acquire information while acquiring an external visual field, a transparent optical device that does not shield the optical device is exposed to the outside, so that the information that the wearer acquires from the display is exposed to the outside A solution to this is required.

1 is a view for explaining the principle of an HMD according to the prior art, which is a simplified version of the optical system arrangement of the HMD disclosed in US Pat. No. 8,094,377 B2 (Registered Jan. 10, 2012) . The HMD according to the prior art of FIG. 1 is of a prism type and is composed of a curved surface 4 and two 45 ° prisms 2 and 3. 1, the HMD of FIG. 1 reflects the image emitted from the display 1 on the mirror coating surface 5 of the curved surface 4 and then reflects the incident prism 2 and the exit prism 3 ) Of the image of the wearer ' s eye (7), thereby providing an enlarged image on the eye (7).

As mentioned above, since the HMD of FIG. 1 uses the partial reflection surface 6 of 45 degrees, the field of view (FOV) of the optical device The thickness becomes thick. Accordingly, the HMD according to the related art has a problem of an increase in weight and volume. A part of the image emitted from the display 1 due to the 45-degree prism structure is reflected by the partial reflection surface 6 And is emitted through one surface 8 of the incidence prism 2, there is a problem that a reflection image of a display that is not enlarged to the opposite side of the position of the eye 7 is exposed.

In order to solve such a problem, Korean Patent Registration No. 10-1517299 (registered on Apr. 27, 2015) filed and filed by the applicant of the present invention can increase the viewing angle and the output beam while minimizing the thickness of the light guide plate, And a spectacle-type display device using a light guide plate capable of largely reducing the volume and maximizing the size of a virtual screen so that a large screen can be viewed.

However, since the incident optical system and the optical guide plate are separated from each other and are separately coupled to each other, the prism is required to make the beam incident on the display device 20 incident on the waveguide, Since the curved surface 21 providing the curved surface 21 is also located in the prism, the incident optical system is bulky and complicated in structure, and thus the optical path is complicated.

US 8,094,377 B2 (Registered on January 10, 2012) KR 10-1517299 B1 (Announcement 2014.05.04) KR 10-0839574 B1 (Notice of June 19, 2008) JP P2003-520984 A (2003.07.08.)

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide an optical device including a waveguide that is capable of guiding an image through at least one total reflection, And an HMD optical system having a structure in which weight and volume can be reduced while images transmitted from a display are not exposed to the front.

Another object of the present invention is to provide an optical system for an HMD which is simple to implement by simplifying the structure of the incident optical system and minimizing the volume.

It is still another object of the present invention to provide an optical system for an HMD that minimizes a path of a beam in a waveguide by locating a curved surface on an upper or lower side of a waveguide in an incident optical system.

Another object of the present invention is to combine the curved surface with the waveguide in the incident optical system so that the optical waveguide is included in the optical module so that the distance of the image light reflected by the curved surface to the wearer's eye can be reduced, And an optical system for an HMD.

It is another object of the present invention to provide an image display device capable of improving the optical performance by increasing the eye box by reducing the number of times of reflection of the image light by reducing the working distance of the image light and providing a comfortable image regardless of the difference in the eye interval of the wearer And an optical system for an HMD.

According to another aspect of the present invention, there is provided a head mount display using a waveguide, the optical system for a head mount display comprising: an image light emitted from the display, An incident prism for emitting an image light incident from the incident prism to the wearer's eye and a partial reflector positioned between the incident prism and the exit prism, A mirror for reflecting the light reflected by the partial reflection plate; And a curved mirror for magnifying the image light reflected by the mirror, wherein the image light magnified at the curved surface is reflected by the partial reflection plate, totally reflected by the exit prism, and emitted to the wearer's eye do.

In the optical system for a head-mounted display using a waveguide according to the present invention, the partial reflector may be a polarizing reflector or a polarizing reflective film, and may be disposed between the incident prism and the mirror and between the exit prism and the curved surface. By further providing each of the wavelength polarizing plates, it is possible to reduce the light amount loss and provide a clearer image.

It is preferable that the optical system for a head mount display using the waveguide according to the present invention further comprises a compensation prism coupled to a final reflection surface of the exit prism to compensate for external view field distortion of the wearer.

Further, in the optical system for a head mount display using a waveguide according to the present invention, the final reflecting surface of the emergent prism may be formed by any one of partial reflection coating, partial reflection film, polarizing reflection coating, polarizing reflection film and polarizing reflector .

According to another aspect of the present invention, there is provided an optical system for a head mount display using a waveguide, the optical system including a head mounted display configured to magnify and image an image light emitted from a display on a wearer's eye, An emission prism for emitting image light incident from the incidence prism to the wearer's eye and a partial reflection plate positioned between the incidence prism and the emission prism and made of a polarizing reflection plate or a polarizing reflection film, And a curved mirror for magnifying the image light incident on the incidence prism when the incident light is incident on the incidence prism. The image light expanded at the curved surface is reflected by the partial reflection plate, and is totally reflected by the exit prism, As shown in FIG.

The optical system for a head mount display using a waveguide according to the present invention is characterized in that the partial reflector is composed of a polarizing reflector or a polarizing reflective film and further includes a quarter wave polarizing plate between the exit prism and the curved surface do.

The optical system for a head mount display using a waveguide according to the present invention may further comprise a compensation prism coupled to a final reflection surface of the exit prism to compensate for external view distortion of the wearer.

In the optical system for a head mount display using a waveguide according to the present invention, the final reflecting surface of the emergent prism may be formed by any one of a partial reflective coating, a partial reflective film, a polarizing reflective coating, a polarizing reflective film, .

Therefore, the present invention can minimize the thickness of the optical device without exposing the image transmitted from the display to the front, thereby remarkably reducing the weight and volume of the optical device, and acquiring the image of the dialog angle.

In addition, the present invention simplifies the structure of the incident optical system and minimizes the volume of the incident optical system, thereby realizing realization of an actual product, thereby reducing the manufacturing cost of the product.

Further, according to the present invention, by combining a curved surface and a waveguide in an incident optical system to incorporate a waveguide in an optical module, the working distance and the number of reflection times of the image light are reduced to minimize loss and aberration of image light, The optical performance can be improved and the image can be provided comfortably regardless of the difference in the eye interval of the wearer.

Further, the present invention provides a structure in which an image derived from a display is directly reflected to the outside and is not exposed, so that it can be utilized in various fields such as industrial, medical, education, sports, have.

1 is a view for explaining the principle of an optical system for an HMD according to the related art,
FIG. 2 is a sectional optical path diagram for explaining an optical system for an HMD using a waveguide according to the first embodiment of the present invention, FIG.
3 is a sectional optical path diagram for explaining an optical system for an HMD using a waveguide according to a second embodiment of the present invention,
4 is a sectional optical path diagram for explaining an optical system for an HMD using a waveguide according to a third embodiment of the present invention,
5 is a sectional optical path diagram for explaining an optical system for an HMD using a waveguide according to a fourth embodiment of the present invention,
6 is a cross-sectional optical path diagram for explaining an optical system for an HMD using a waveguide according to a fifth embodiment of the present invention;

Hereinafter, embodiments of an optical system for an HMD using a waveguide according to the present invention will be described in detail with reference to the drawings. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS The same features of the figures represent the same symbols wherever possible. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

The HMD optical system using the waveguide according to the present invention can reduce the thickness by using a prism or a waveguide that performs partial total reflection at 45 degrees or less and total internal reflection at least once, And is characterized by providing an HMD that minimizes loss of light amount by using a ¼ wavelength polarizing plate and a polarizing film.

The HMD optical system using the waveguide according to the present invention minimizes the volume of the HMD by minimizing the volume of the beam in the waveguide by locating the curved surface providing the power in the incident optical system directly above or below the waveguide, To reduce the beam loss and provide a clearer image.

In addition, the HMD optical system using the waveguide according to the present invention increases the optical performance of the eye box by reducing the number of times of reflection of the beam, thereby increasing the deviation according to the wearer's different eye interval There is a feature that can be.

Hereinafter, an HMD optical system using a waveguide according to the present invention will be described in detail with reference to the drawings.

FIG. 2 is a sectional optical path diagram for explaining an optical system for an HMD using a waveguide according to the first embodiment of the present invention, and shows a waveguide HMD having a partial reflection plane of 45 degrees or less.

2, the HMD optical system using the waveguide according to the first embodiment of the present invention includes a rectangular incidence prism 21, a curved surface 27 having a curved reflective surface 271, And an emission prism 25 and a compensation prism 29 for guiding the beam. The incident prism 21 and the exit prism 25 are combined with the partial reflection plate 24 inserted in the contact surface to form a waveguide whose reflection surface is 45 degrees or less.

2, the HMD optical system using the waveguide according to the first embodiment of the present invention is constituted by the polarizing reflection plate or the polarizing reflection film to reduce the light amount loss, and the quarter wave plate 22, 26, And the mirror 23, respectively, and the final reflecting surface 252 may be constituted by applying a polarizing reflection coating or attaching a polarizing reflecting film or a polarizing reflecting plate.

The image outputted from the display 20 is totally reflected on one surface 211 of the rectangular incident prism 21 and then reflected by the partial reflecting plate 24 and reflected by the mirror 23 in the opposite direction, 27 by the curved reflecting surface 271 and reflected by the partial reflecting plate 24 between the prisms. The beam reflected by the partial reflector 24 is totally reflected on one surface 251 of the exit prism 25 and reflected on the final reflecting surface 252 and then incident on the eye 28. Accordingly, in the eye 28, an image enlarged by the curved surface 27 can be seen and an external view can be secured. The compensation prism 29 compensates for the distortion when securing the external view.

Here, the partial reflection plate 24 and the final reflection surface 252 may be formed of a partial reflection coating or a partial reflection film, and may also be a polarizing reflection coating or a polarizing reflection film. At this time, the ¼ wavelength polarizing plate 22 is placed between the incident prism 21 and the mirror 23, and the ¼ wavelength polarizing plate 26 is provided between the emergent prism 25 and the curved surface 27 to induce only the polarized beam The light amount loss of the image transmitted by the eye can be reduced.

As described above, the HMD optical system using the waveguide according to the first embodiment of the present invention shown in FIG. 2 has an angle of 45 degrees or less between the two surfaces 251 and 252 of the outgoing prism 25 It is possible to reduce the thickness and the volume of the HMD, and the image emitted from the display 20 is totally internally reflected by the prism in the form of waveguide, As a structure to be guided, the display image is not directly reflected and emitted in the direction opposite to the eye 28, so that the unexpanded display image is not exposed to the outside.

In the HMD optical system using the waveguide according to the first embodiment of the present invention, the curved surface 27 is positioned on the waveguide formed by the incident prism 21 and the exit prism 25, so that the incident optical system and the waveguide are integrated, And the number of reflection times is reduced as the beam travel path is shortened. Therefore, it is possible to provide a clearer image by reducing the beam loss and the aberration. In addition, the HMD optical system using the waveguide according to the first embodiment of the present invention can accommodate a variation in eye interval with a wider variation depending on the wearer as the number of reflections decreases, And provides stable optical performance.

3 is a cross-sectional optical path diagram for explaining an optical system for a HMD using a waveguide according to a second embodiment of the present invention. As in the first embodiment, a waveguide-type HMD optical system having a partial reflection plane of 45 degrees or less is shown It is.

Referring to FIG. 3, the HMD optical system using the waveguide according to the second embodiment of the present invention includes a triangular incident prism 31, a curved surface 37 having a curved reflecting surface 371, And an emission prism 35 and a compensation prism 39 for guiding the beam. The incident prism 31 and the exit prism 35 are combined with the partial reflection plate 34 inserted into the contact surface to form a waveguide whose reflection surface is 45 degrees or less.

3, the HMD optical system using the waveguide according to the second embodiment of the present invention includes the polarizing reflector or the polarizing reflective film to reduce the loss of light amount, and the ¼ polarizers 32 and 36, The mirror 33 may be disposed and the final reflecting surface 352 may be formed by polarizing reflection coating or attaching a polarizing reflecting film or polarizing reflecting plate.

The image outputted from the display 30 is totally reflected on one surface 311 of the triangular incident prism 31 and reflected by the mirror 33 and then reflected by the curved reflecting surface 371 of the curved surface 37 again And is reflected by the partial reflection plate 34 between the incident prism 31 and the exit prism 35. The reflected beam is totally reflected on one surface 351 of the exit prism 35 and then reflected by the final reflecting surface 352 to be incident on the eye 38.

Accordingly, in the eye 38, an image enlarged by the curved surface 37 can be seen and an external view can be secured. In securing the external view, the compensation prism 39 compensates for the distortion.

Here, the partial reflection plate 34 and the final reflection surface 352 may be formed of a partial reflection coating or a partial reflection film, and may also be a polarizing reflection coating or a polarizing reflection film. At this time, the ¼ wavelength polarizing plate 32 is disposed between the incident prism 31 and the mirror 33, and the ¼ wavelength polarizing plate 36 is provided between the emergent prism 35 and the curved surface 37 to induce only the polarized beam The light amount loss of the image transmitted by the eye can be reduced.

As described above, the HMD optical system using the waveguide according to the second embodiment of the present invention shown in Fig. 3 has the angle between the two surfaces 351 and 352 of the emergent prism 35 at 45 degrees or less It is possible to form the same angle of view with a thin thickness structure compared to the 45 ° prism, thereby reducing the thickness and volume of the HMD.

In addition, since the image emitted from the display 30 is totally internally reflected by the prism in the form of waveguide and guided to the eye 38, the image is not directly reflected but emitted in the opposite direction of the eye, And the second embodiment of FIG. 3 has a structure capable of further reducing the number of beam reflections in comparison with the first embodiment of FIG.

The HMD optical system using the waveguide according to the second embodiment of the present invention is characterized in that the curved mirror 37 is positioned on the waveguide formed by the incident prism 31 and the exit prism 35 so that the incident optical system and the waveguide are integrated, Since the volume of the beam is minimized and the number of reflection times is reduced as the beam travel path is minimized, it is possible to provide a clearer image by reducing beam loss and aberration. In addition, the HMD optical system using the waveguide according to the second embodiment of the present invention can accommodate a variation in the eye interval with a wider variation depending on the wearer as the number of reflections decreases, And provides stable optical performance.

4 is a cross-sectional optical path diagram for explaining an optical system for an HMD using a waveguide according to a third embodiment of the present invention. As in the first and second embodiments, a waveguide HMD Fig.

4, the HMD optical system using the waveguide according to the third embodiment of the present invention includes a triangular incident prism 41, a curved surface 43 having a curved reflecting surface 431, And a compensating prism 49 functioning as a waveguide for guiding the beam. 44)

4, the HMD optical system using the waveguide according to the third exemplary embodiment of the present invention includes the polarizing reflector or the polarizing reflective film to reduce loss of light, and the polarizing plates 42 and 46, A mirror 47 may be disposed and the final reflecting surface 453 may be formed by polarizing reflection coating or attaching a polarizing reflecting film or polarizing reflecting plate.

The image emitted from the display 40 is totally reflected on one surface 411 of the triangular incident prism 41 and reflected by the partial reflector 44 and then reflected by the mirror 47 in the opposite direction to form a curved surface 43 ). The image incident on the curved surface 43 is reflected again by the curved reflecting surface 431 and reflected by the partial reflecting plate 44 into the emitting prism 45 forming the waveguide. The reflected beam is totally reflected twice or more in the exit prism 45 and then reflected by the final reflecting surface 453 to be incident on the eye 48.

Accordingly, in the eye 48, the image enlarged by the curved surface 43 can be seen and the external view can be ensured. In the securing of the external view, the compensation prism 49 compensates for the distortion.

Here, the partial reflection plate 44 and the final reflection surface 453 may be formed of a partial reflection coating or a partial reflection film, and may also be a polarizing reflection coating or a polarizing reflection film. At this time, the ¼ wavelength polarizing plate 46 is placed between the incident prism 41 and the mirror 47, and the ¼ wavelength polarizing plate 42 is provided between the emergent prism 45 and the curved surface 43 to induce only the polarized beam The light amount loss of the image transmitted to the eye 48 can be reduced.

As described above, in the HMD optical system using the waveguide according to the third embodiment of the present invention shown in Fig. 4, since the angle between the two surfaces 451 and 453 of the emergent prism 45 has an angle of 45 degrees or less It is possible to form the same angle of view with a thin thickness structure compared to the 45 ° prism, thereby reducing the thickness and volume of the HMD.

In addition, since the image emitted from the display 40 is totally internally reflected in the form of a waveguide by the prism and guided to the eye 48, the image is not directly reflected but emitted in the opposite direction to the eye, I can not see the video.

4, the curved surface 43 is positioned in the opposite direction to the position of the eye 48. In contrast, the third embodiment of FIG. 4 differs from the first embodiment of FIG. And a distance between the incident side and the emitting side is secured by using a longer length waveguide that can guide the image through two or more total internal reflection, This is a structure that can be secured.

In the optical system for HMD using the waveguide according to the third embodiment of the present invention, since the curved surface 43 is positioned on the waveguide formed by the incident prism 41 and the exit prism 45, the incident optical system and the waveguide are integrated, And the number of reflection times is reduced as the beam travel path is shortened. Therefore, it is possible to provide a clearer image by reducing the beam loss and the aberration. In addition, the HMD optical system using the waveguide according to the third embodiment of the present invention can accommodate a variation in the eye interval with a wider variation depending on the wearer because the eye box becomes larger as the number of reflections decreases, And provides stable optical performance.

5 is a cross-sectional optical path diagram for explaining an optical system for an HMD using a waveguide according to a fourth embodiment of the present invention. As in the first to third embodiments described above, a waveguide HMD Fig.

5, the HMD optical system using the waveguide according to the fourth embodiment of the present invention includes a triangular incident prism 51, a curved surface 57 having a curved reflecting surface 571, And an outgoing prism 55 and a compensating prism 59 forming a waveguide for guiding the beam.

5, the HMD optical system using the waveguide according to the fourth embodiment of the present invention includes a polarizing reflector or a polarizing reflective film to reduce loss of light, and the polarizing plates 52 and 56, A mirror 53 may be disposed and the final reflecting surface 553 may be formed by polarizing reflection coating or attaching a polarizing reflecting film or a polarizing reflecting plate.

The image emitted from the display 50 is reflected by the partial reflection plate 54 of the triangular incident prism 51 and then reflected by the mirror 53 in the opposite direction and is incident on the curved surface 57. The image incident on the curved surface 57 is reflected again by the curved reflecting surface 571 of the curved surface 57 and reflected by the partial reflecting plate 54 into the emitting prism 55 forming the waveguide. The reflected beam is totally reflected twice or more in the exit prism 55, reflected by the final reflecting surface 553, and incident on the eye 58.

Accordingly, in the eye 58, the image enlarged by the curved surface 57 can be seen and an external view can be ensured, and the compensating prism 59 compensates for the distortion when the external view is secured.

Here, the partial reflection plate 54 and the final reflection surface 553 may be formed of a partial reflection coating or a partial reflection film, and may be formed of a polarizing reflection coating or a polarizing reflection film. At this time, a ¼ wavelength polarizing plate 52 is placed between the incident prism 51 and the mirror 53, and a ¼ wavelength polarizing plate 56 is provided between the emergent prism 55 and the curved surface 57 to induce only the polarized beam The light amount loss of the image transmitted to the eye 58 can be reduced.

As described above, the HMD optical system using the waveguide according to the fourth embodiment of the present invention shown in Fig. 5 has the angle between the two surfaces 551 and 553 of the emergent prism 55 is 45 degrees or less It is possible to form the same angle of view with a thin thickness structure compared to the 45 ° prism, thereby reducing the thickness and volume of the HMD.

In addition, since the image emitted from the display 50 is totally internally reflected by the prism in a waveguide shape and guided to the eye 58, the image is not directly reflected but emitted in the opposite direction to the eye, I can not see the video. The fourth embodiment of FIG. 5 has a structure capable of reducing the number of beam reflections when compared with the third embodiment of FIG.

In the HMD optical system using the waveguide according to the fourth embodiment of the present invention, since the curved surface 57 is positioned on the waveguide formed by the incident prism 51 and the exit prism 55, the incident optical system and the waveguide are integrated with each other, And the number of reflection times is reduced as the beam travel path is shortened. Therefore, it is possible to provide a clearer image by reducing the beam loss and the aberration. In addition, the HMD optical system using the waveguide according to the fourth embodiment of the present invention can accommodate a variation in eye interval with a wider variation depending on the wearer as the number of reflections decreases, And provides stable optical performance.

6 is a cross-sectional optical path diagram for explaining an optical system for an HMD using a waveguide according to a fifth embodiment of the present invention. As in the first to fourth embodiments described above, a waveguide HMD Fig.

6, the HMD optical system using the waveguide according to the fifth embodiment of the present invention includes a rectangular incidence prism 61, a curved surface 65 having a curved reflective surface 651, And an outgoing prism 63 and a compensating prism 67 forming a waveguide for guiding the beam.

6, the HMD optical system using the waveguide according to the fifth embodiment of the present invention includes a polarizing reflector or a polarizing reflective film to reduce the loss of light amount, and a ¼ polarizer 64 And the final reflection surface 633 may be formed by polarizing reflection coating or by attaching a polarizing reflection film or a polarizing reflection plate.

The image emitted from the display 60 is reflected by the mirror coating surface 611 of the triangular incident prism 61 and is incident on the curved surface 65. The image incident on the curved mirror 65 is reflected by the curved mirror 651 of the curved mirror 65 and reflected by the mirror 62 to the inside of the waveguide. The reflected beam is totally reflected twice or more in the exit prism 63 forming the waveguide, and then reflected by the final reflecting surface 633 to be incident on the eye 66.

Accordingly, in the eye 66, an image enlarged by the curved surface 65 can be seen, an external view can be secured, and the compensation prism 67 compensates for the distortion when securing the external view.

The partial reflection plate 62 and the final reflection surface 633 may be formed of a partial reflection coating or a partial reflection film or may be constituted of a polarizing reflection coating or a polarizing reflection film, A quarter wavelength polarizing plate 64 is provided between the polarizing plate 65 and the polarized beam to induce only the polarized beam, thereby reducing the light amount loss of the image transmitted to the eye 66.

As described above, in the HMD optical system using the waveguide according to the fourth embodiment of the present invention shown in Fig. 5, the angle between the two surfaces 631 and 633 of the emergent prism 63 has an angle of 45 degrees or less It is possible to form the same angle of view with a thin thickness structure compared to the 45 ° prism, thereby reducing the thickness and volume of the HMD.

The image emitted from the display 60 is totally internally reflected by the prism in a waveguide shape and guided to the eye 66. Since the image is not directly reflected but emitted in the opposite direction to the eye, I can not see the video. The fifth embodiment shown in Fig. 6 can reduce the number of times of reflection by the incident prism 61 and minimize the loss of the light amount by using the quarter wavelength polarizing plate 64 once, as compared with the fourth embodiment of Fig. can do.

In the optical system for HMD using the waveguide according to the fifth embodiment of the present invention, since the curved surface 65 is positioned on the waveguide formed by the incident prism 61 and the exit prism 63, the incident optical system and the waveguide are integrated, Since the volume of the beam is minimized and the number of reflection times is reduced as the beam travel path is minimized, it is possible to provide a clearer image by reducing beam loss and aberration. In addition, the HMD optical system using the waveguide according to the fifth embodiment of the present invention can accommodate a variation in eye interval with a wider variation depending on the wearer as the number of reflections decreases, And provides stable optical performance.

As described above, since the HMD optical system using the waveguide according to the present invention is composed of an optical device including a waveguide that has a partial reflection plane of 45 degrees or less and can guide an image through one or more total reflection, It is possible to reduce the weight and volume, and to provide an HMD having a structure in which the image transmitted from the display is not exposed to the front.

Further, since the HMD optical system using the waveguide according to the present invention is positioned on the waveguide formed by the incidence prism and the exit prism, the incident optical system and the waveguide are integrated to minimize the volume of the HMD, Since the number of times is reduced, the beam loss and aberration can be reduced to provide a clearer image.

In addition, the HMD optical system using the waveguide according to the present invention can accommodate a variation in the eye interval with a wider variation depending on the wearer as the number of reflections decreases, thereby providing more stable optical performance do.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (8)

CLAIMS 1. A head-mounted display for magnifying and imaging an image light emitted from a display on a wearer's eye,
An exit prism for emitting image light incident from the incident prism to the wearer's eye and a partial reflector positioned between the incident prism and the exit prism,
A mirror for reflecting the image light incident on the incidence prism when the light is reflected by the partial reflection plate; And
And a curved surface enlarging the image light reflected by the mirror,
Wherein the image light enlarged in the curved surface is reflected by the partial reflection plate and then totally reflected by the exit prism and emitted to the wearer's eye.
The method according to claim 1,
The partial reflection plate is composed of a polarizing reflection plate or a polarizing reflection film,
Further comprising a quarter wavelength polarizing plate between the incident prism and the mirror and between the exit prism and the curved surface.
The method according to claim 1,
And a compensation prism coupled to a final reflection surface of the exit prism to compensate for external view field distortion of the wearer.
The light-emitting device according to claim 3, wherein the final reflecting surface of the exit prism
A polarizing reflective film, and a polarized light reflective film is further formed on the optical waveguide layer.
CLAIMS 1. A head-mounted display for magnifying and imaging an image light emitted from a display on a wearer's eye,
An exit prism for emitting image light incident from the incident prism to the wearer's eye and a partial reflector positioned between the incident prism and the exit prism,
And a curved surface enlarging the incident light when the incident image light is incident on the incident prism,
Wherein the image light enlarged in the curved surface is reflected by the partial reflection plate and then totally reflected by the exit prism and emitted to the wearer's eye.
6. The method of claim 5,
The partial reflection plate is composed of a polarizing reflection plate or a polarizing reflection film,
And a quarter wavelength polarizing plate is further provided between the exit prism and the curved surface, and the optical system for a head mount display using the waveguide.
6. The method of claim 5,
And a compensation prism coupled to a final reflection surface of the exit prism to compensate for external view field distortion of the wearer.
8. The light-emitting device according to claim 7, wherein the final reflecting surface of the exit prism
A polarizing reflective film, and a polarized light reflective film is further formed on the optical waveguide layer.

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