KR20140077378A - Apparatus for head mounted display using holographic optical element lens - Google Patents

Apparatus for head mounted display using holographic optical element lens Download PDF

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Publication number
KR20140077378A
KR20140077378A KR1020120146115A KR20120146115A KR20140077378A KR 20140077378 A KR20140077378 A KR 20140077378A KR 1020120146115 A KR1020120146115 A KR 1020120146115A KR 20120146115 A KR20120146115 A KR 20120146115A KR 20140077378 A KR20140077378 A KR 20140077378A
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KR
South Korea
Prior art keywords
lens
optical element
image
hoe
output unit
Prior art date
Application number
KR1020120146115A
Other languages
Korean (ko)
Inventor
류성원
김용완
이기석
김기홍
Original Assignee
한국전자통신연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 한국전자통신연구원 filed Critical 한국전자통신연구원
Priority to KR1020120146115A priority Critical patent/KR20140077378A/en
Publication of KR20140077378A publication Critical patent/KR20140077378A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B27/0103—Head-up displays characterised by optical features comprising holographic elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/32—Holograms used as optical elements
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/20—Copying holograms by holographic, i.e. optical means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B27/0103—Head-up displays characterised by optical features comprising holographic elements
    • G02B2027/0109—Head-up displays characterised by optical features comprising holographic elements comprising details concerning the making of holograms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features
    • G02B2027/0174—Head mounted characterised by optical features holographic

Abstract

A head mounted display apparatus using a holographic optical element (HOE) is an optical element and comprises a lens made of the HOE and an image output unit. The HOE lens is a lens manufactured by the optical element using the principle of holography. The HOE lens can simplify a structure by fabricating a conventional diffraction grating, a lens, a mirror, and an optical filter using holographic techniques. The HOE lens is disposed away by a predetermined distance along the optical axis of the image light generated by the image output unit. In addition, the HOE lens refracts the image light projected from the image output unit and induces the eyes of a user to focus.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a head-mounted display device using a holographic optical element lens,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head mounted display apparatus, and more particularly, to an optical system of a head mounted display apparatus.

A head mounted display is a device mounted on a user's head to display a stereoscopic image and to detect movement of the head and use it in a robot or a control system. The head-mounted display has been used for military purposes because it has little eye movement and therefore not only low risk of an accident, but also has less fatigue of eyes and is applied to fighter control. However, with advances in technology, these head-mount displays are beginning to be used in a variety of areas.

2. Description of the Related Art Generally, a head mount display device forms a focus so that a virtual large screen can be formed at a certain distance using a transmissive optical system or a reflective optical system using light refraction, So that the user can see the enlarged virtual image.

In such an optical system of a head mount display, a display element is located close to the eyeball and the image needs to be magnified at a high magnification, so that a high performance optical system is required and a large number of glass lenses having a large refractive index are required. Therefore, the characteristics of such a head-mounted display device require a heavy optical structure and a complicated optical structure. Thus, it becomes difficult to manufacture a light-weight head-mounted display.

A problem to be solved by the present invention is to use a holographic optical element (hereinafter referred to as HOE) lens having a small thickness instead of the heavy and complicated optical structure of a conventional head-mounted display device, The weight of the head-mounted display device is reduced through the structure of directly projecting the silkworm.

A head-mounted display device using a holographic optical element according to the present invention includes a lens made of a holographic optical element as an optical element and an image output unit.

The HOE lens is a lens made of an optical element using the principle of holography. The HOE lens is made by using the existing diffraction grating, lens, mirror and optical filter using holography technique, and can simplify the structure. The HOE lens is disposed at a predetermined distance along the optical axis of the image light generated in the image output unit. In addition, the HOE lens refracts the image light projected from the image output unit and guides it to the user's eyeball, thereby focusing.

The video output unit is formed on the same horizontal line as the HOE lens at a predetermined distance. The image output unit projects the image light to the HOE lens, and provides the image light refracted by the HOE lens to the user. The video output unit is not limited to a specific video output device, and can be applied to any type of video output device if it can be installed in the head mount display device.

The head-mounted display device using the holographic optical element according to the present invention can employ a multi-resolution HOE lens. A head-mounted display device using a holographic optical element having a multi-resolution HOE lens has the same closed structure as the above-described device. The multi-resolution HOE lens is disposed at a predetermined distance along the optical axis of the image light generated in the image output unit. The image output unit is formed at a predetermined distance on the same horizontal line as the multi-resolution HOE lens. The image output unit projects the image light to the multi-resolution HOE lens, and provides the image light refracted by the multi-resolution HOE lens to the user.

A multi-resolution HOE lens is divided into two or more regions, each of which has a different resolution. The multi-resolution HOE lens refracts the image light projected from the image output unit 130 according to the resolution, and focuses the image light by guiding it to the user's eyeball. The resolution of the image light projected by the image output part can be partially controlled by using the difference in resolution between different resolutions of the multi-resolution HOE lens.

The head-mounted display device using the holographic optical element according to the present invention can simplify the weight and structure of the optical system that occupies a large portion of the weight compared with the head-mounted display using the conventional optical system, Excellent HMD can be realized. In addition, the resolution of the HOE lens of the head mount display differs depending on the area, thereby providing a high-resolution image at the center of the field of view, providing a high-quality image and providing a relatively low resolution image at the periphery, By providing a viewing angle, a user's immersion feeling can be enhanced.

1 is a configuration diagram showing a general transmissive head-mounted display device.
2 is a configuration diagram showing a general closed head-mounted display device.
3 is a block diagram showing an embodiment of a head-mounted display device using a holographic optical element according to the present invention.
4 is a block diagram showing an embodiment having multiple resolutions of a head-mounted display device using the holographic optical element according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The terms used in the present specification are terms selected in consideration of the functions and effects in the embodiments, and the meaning of the terms may vary depending on the intention of the user or the operator or industry custom. Therefore, the meaning of the term used in the following embodiments is based on the defined definition when specifically stated in this specification, and unless otherwise stated, it should be interpreted in a sense generally recognized by those skilled in the art.

Head-mounted display devices can be broadly divided into two types, see-through and closed-type.

1 is a configuration diagram showing a general transmissive head-mounted display device.

Referring to Fig. 1, a transmissive head-mounted display device comprises a video screen 11 and a reflective optical element 12. As shown in Fig. The image screen 11 for outputting an arbitrary image is formed so as to have a predetermined angle with the reflective optical element 12. [ The image outputted from the image screen 11 is reflected by the reflective optical element 12 and the user can see the reflected output image. The reflective optical element 12 may be formed in a partially transmissive form although the reflective optical element 12 may be completely reflected as a mirror and can not be seen through the reflective optical element 12. In the case of using the reflective optical element 12 of a transmissive type, the reflective optical element 12 can be seen through the reflective optical element 12 while viewing the output image reflected by the reflective optical element 12.

2 is a configuration diagram showing a general closed head-mounted display device.

Referring to FIG. 2, a typical closed head-mounted display device includes an image screen 21 and an optical lens 22. The image screen 21 for outputting an arbitrary image is positioned on the horizontal line with the optical lens 22. [ The user can view an image output from the image screen 21 through the optical lens 22 in the form of a convex lens. The closed head-mounted display device can not see the outside, but can see a clearer output image than the transmissive type.

3 is a block diagram showing an embodiment of a head-mounted display device using a holographic optical element according to the present invention.

Referring to FIG. 3, a head-mounted display device using a holographic optical element (HOE) according to the present invention uses a lens 110 made of a holographic optical element as an optical element. The HOE lens 110 is a lens made of an optical element using the principle of holography. The HOE lens 110 is manufactured by using a conventional diffraction grating, a lens, a mirror, and an optical filter using a holographic technique, and the structure can be simplified. Since the HOE lens 110 is manufactured by recording an interference fringe formed by two or more coherent beams, it is easy to manufacture a holographic optical element having a relatively aspherical lens property. The direction of the light diffracted by the HOE lens 10 is determined by the fringe structure of the surface of the HOE lens 10 while the efficiency of the diffracted light is determined by the internal stripe structure such as the stripe direction and refractive index modulation .

Since the number of optical elements is remarkably reduced due to the use of the HOE lens 110, the system is advantageous in that it is significantly lighter than conventional HMD devices and can be configured in a narrow space. The role of the HOE lens 110 is to reflect a two-dimensional display image onto the eyes of a user wearing the head-mounted display device to image.

The head-mounted display device using the holographic optical element according to the present invention has a closed structure. The HOE lens 110 is disposed at a predetermined distance along the optical axis of the image light generated by the image output unit 130. That is, the HOE lens 110 is formed at a predetermined distance for focusing on the same horizontal line as the image output unit 130. Also, the HOE lens 110 refracts the image light projected from the image output unit 130 and guides the image light to the eye of the user to focus the image.

The image output unit 130 is formed on the same horizontal line as the HOE lens 110 at a predetermined distance. The image output unit 130 projects the image light to the HOE lens 110 and provides the image light refracted by the HOE lens 110 to the user. The video output unit 130 is not limited to a specific video output device, and can be applied to any type of video output device if it can be installed in the head mount display device. The video light projected by the video output unit 130 may include various information or contents.

4 is a block diagram showing an embodiment having multiple resolutions of a head-mounted display device using the holographic optical element according to the present invention.

Referring to FIG. 4, the head-mounted display device using the holographic optical element according to the present invention may include a multi-resolution HOE lens 210 and an image output unit 130.

A head-mounted display device using a holographic optical element having a multi-resolution HOE lens 210 has the same closed structure as in Fig. The multi-resolution HOE lens 210 is disposed at a predetermined distance along the optical axis of the image light generated by the image output unit 130. That is, the multi-resolution HOE lens 210 is formed at a predetermined distance for focusing on the same horizontal line as the image output unit 130.

The image output unit 130 is formed on the same horizontal line as the multi-resolution HOE lens 210 by a predetermined distance. The image output unit 130 projects the image light to the multi-resolution HOE lens 210, and provides the image light refracted by the multi-resolution HOE lens 210 to the user. The video output unit 130 is not limited to a specific video output device, and can be applied to any type of video output device if it can be installed in the head mount display device. The video light projected by the video output unit 130 may include various information or contents.

The multi-resolution HOE lens 210 is an HOE lens in which the central portion 21 and the peripheral portion 22 have different resolution. The multi-resolution HOE lens 210 refracts the image light projected from the image output unit 130 according to the resolution, and focuses the image light by guiding it to the user's eyeball. The resolution of the image light projected by the image output unit 130 can be partially adjusted by using the difference in resolution between different resolutions of the multi-resolution HOE lens 210. For example, if the resolution of the central portion 21 is made larger than the resolution of the peripheral portion 22, the resolution of the center portion of the image light projected by the video output portion 130 is high. On the contrary, if the resolution of the central portion 21 is made smaller than the resolution of the peripheral portion 22, the resolution of the outer portion of the video light is high. The resolving power of the multi-resolution HOE lens 210 is not limited to the two regions of the central portion 21 and the peripheral portion 22, but may be divided into regions having two or more resolutions according to design purposes and applications .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It is possible.

110: HOE lens
130: Video output unit
210: Multiple resolution HOE lens

Claims (1)

1. A head mounted display comprising a holographic optical element (HOE) lens and an image output unit,
A holographic optical element lens which is formed of a holographic optical element and is disposed at a predetermined distance along the optical axis of the image light projected from the image output unit and refracts the image light projected from the image output unit to guide the light to the user's eyeball, ; And
An image output unit for projecting image light to the holographic optical element lens;
And a display unit for displaying the image on the display unit.
KR1020120146115A 2012-12-14 2012-12-14 Apparatus for head mounted display using holographic optical element lens KR20140077378A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120146115A KR20140077378A (en) 2012-12-14 2012-12-14 Apparatus for head mounted display using holographic optical element lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120146115A KR20140077378A (en) 2012-12-14 2012-12-14 Apparatus for head mounted display using holographic optical element lens

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KR20140077378A true KR20140077378A (en) 2014-06-24

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180115311A (en) * 2016-06-21 2018-10-22 애플 인크. Optical system for display
KR20210130672A (en) * 2014-09-04 2021-11-01 삼성디스플레이 주식회사 Head mounted display apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210130672A (en) * 2014-09-04 2021-11-01 삼성디스플레이 주식회사 Head mounted display apparatus
KR20180115311A (en) * 2016-06-21 2018-10-22 애플 인크. Optical system for display

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