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KR101645989B1 - Head mounted display apparatus using photopolymer and image display method - Google Patents

Head mounted display apparatus using photopolymer and image display method Download PDF

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Publication number
KR101645989B1
KR101645989B1 KR1020150038068A KR20150038068A KR101645989B1 KR 101645989 B1 KR101645989 B1 KR 101645989B1 KR 1020150038068 A KR1020150038068 A KR 1020150038068A KR 20150038068 A KR20150038068 A KR 20150038068A KR 101645989 B1 KR101645989 B1 KR 101645989B1
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KR
South Korea
Prior art keywords
optical element
lens array
holographic optical
image
incident angle
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KR1020150038068A
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Korean (ko)
Inventor
박재형
이성근
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인하대학교 산학협력단
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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
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features
    • 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
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • H04N13/0429—
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

According to an embodiment of the present invention, a head mounted display device comprises: a holographic optical element in which a first lens arrangement state matched with reference light having a first incident angle and a second lens arrangement state matched with reference light having a second incident angle are recorded; a first display unit configured to output a first received image having the first incident angle with respect to the holographic optical element; and a second display unit configured to output a second received image having the second incident angle with respect to the holographic optical element. Therefore, the head mounted display device improves a depth feeling by using a photopolymer.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a head-mounted display device using a photopolymer,

The present invention relates to a head-mounted display device using a photopolymer and an image display method.

The Head Mounted Display (HMD) was first used in the helmets of 1970s fighter pilots. For example, a small display device may be placed in a helmet, and a light reflected from the display may be reflected by using a prism or an autocorreated curved mirror so that a virtual image can be seen through an observer's eye.

The head-mounted display has many benefits because it allows you to see the image displayed on the display while viewing the surrounding field of view. However, such a head mount display is heavy on the head and has a disadvantage of being bulky. In recent years, head-mounted display products have been introduced that can be used like glasses by reducing weight and volume. However, since these products also use elaborately designed optical systems for displaying images, they are still bulky and expensive .

 On the other hand, a photopolymer is a transparent film type recording medium having a characteristic in which a refractive index changes by reacting with light upon receiving light. A holographic optical element (HOE) having various characteristics can be manufactured by using the properties of the photopolymer.

With respect to a method of manufacturing a head mount display using such a holographic optical element, Korean Laid-Open Patent Application No. 2014-0136145 discloses a full color holographic optical element using a photopolymer, a method of manufacturing the same, . Japanese Laid-Open Patent Publication No. 2010-204397 discloses an image display apparatus and a head mount display.

However, currently developed and sold head mount displays have a disadvantage in that images that can be transmitted to each eye of the user are limited to two dimensions. In addition, even if a two-dimensional parallax image is transmitted in both eyes, the accommodation-vergence mismatch between the depth determined by the parallax between the images and the depth of the actual user's eye, It can cause eye fatigue and deteriorate concentration.

In order to solve the above-described problems, an embodiment of the present invention provides a holographic optical element in which at least two lens arranging states are recorded in one photopolymer in order to display a three- And an image display method using the head-mounted display device.

It is to be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may be present.

According to an aspect of the present invention, there is provided a head-mounted display device including a first lens array state matched with reference light having a first incident angle, a second lens array state matching a reference light having a second incident angle, A first display unit for outputting a first image which is incident on the holographic optical element so as to have a first incident angle and a second image which is incident on the holographic optical element so as to have a second incident angle, And a second display unit for outputting the second display unit.

According to another aspect of the present invention, there is provided a head-mounted display device including a holographic optical element in which a first lens array state matched with a reference light of a first wavelength and a second lens array state matched with a reference light of a second wavelength are recorded, A first display unit for outputting a first image of a first wavelength to the holographic optical element, and a second display unit for outputting a second image of the second wavelength to the holographic optical element.

According to an aspect of the present invention, there is provided a method of displaying an image on a head mounted display device, the method comprising: outputting a first image incident on the holographic optical element with a first incident angle; And outputting a second image to be input so as to have the first image.

At this time, the holographic optical element records in advance a first lens array state matched to the reference light having the first incident angle and a second lens array state matched to the reference light having the second incident angle.

According to another aspect of the present invention, there is provided a method of displaying an image on a head mounted display device, comprising: outputting a first image of a first wavelength to a holographic optical element; .

At this time, the holographic optical element records in advance a first lens array state matched to the reference light of the first wavelength and a second lens array state matched to the reference light of the second wavelength.

According to the head-mounted display device having improved depth by using the photopolymer according to an embodiment of the present invention, it is possible to manufacture a holographic optical element using a photopolymer recording at least two lens arrays, A head-mounted display having a simplified structure can be manufactured by using an optical element. As a result, a 3D image can be observed which is not experienced in a conventional head mount display, and a 3D image is transmitted to each of the left and right eyes of an observer, so that the depth perceived by the observer and the distance It is possible to display a natural three-dimensional image without accommodation-vergence mismatch free.

In addition, the image provider can easily implement a three-dimensional image by outputting an image incident on the photopolymer at an incident angle that was utilized when recording the lens array state, or outputting an image of a wavelength used for recording the lens array state have.

In addition, in the embodiment of the present invention, since the image displayed on the head mount display is displayed in three dimensions by using the integrated image technique and information can be displayed at the same position as the user views, It can reduce the fatigue of the eyes by confirming the desired information, and it is possible to observe a more natural three-dimensional image through the process of increasing the depth feeling.

FIGS. 1A and 1B are views for explaining a process of recording a first lens array and a second lens array state on a photopolymer for manufacturing a holographic optical element according to an embodiment of the present invention.
2 is a block diagram of a head-mounted display according to an embodiment of the present invention.
3 is a view for explaining a principle of generating a three-dimensional image output from a head mount display according to an embodiment of the present invention.
4 is a view for explaining the operation principle of a head mount display according to an embodiment of the present invention.
5 is a configuration diagram of a head mount display according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "including" an element, it is to be understood that the element may include other elements as well as other elements, And does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

The following examples are intended to further illustrate the present invention and are not intended to limit the scope of the present invention. Accordingly, the same scope of the invention performing the same function as the present invention will also fall within the scope of the present invention.

The present invention proposes a head-mounted display device in which the depth representation of a three-dimensional image is increased by using a photopolymer.

Hereinafter, a head-mounted display device according to an embodiment of the present invention will be described.

A head-mounted display device according to an embodiment of the present invention may include a holographic optical element, a first display portion, and a second display portion.

The holographic optical element may record the first lens array state matched with the reference light having the first incident angle and the second lens array state matched with the reference light having the second incident angle.

The first display unit may output a first image incident on the holographic optical element so as to have a first incident angle.

And the second display unit may output a second image that is incident on the holographic optical element to have a second incident angle.

Details regarding the first display unit and the second display unit will be described later.

Hereinafter, the holographic optical element in which the first lens array and the second lens array are recorded will be described with reference to FIGS. 1A and 1B.

FIGS. 1A and 1B are views for explaining a process of recording a first lens array and a second lens array state on a photopolymer for manufacturing a holographic optical element according to an embodiment of the present invention.

At least two lens array states can be recorded in the holographic optical element using angle selectivity, which is one of the photopolymer properties. Here, the holographic optical element may be a photopolymer in which the lens array state is recorded.

First, a process of recording the state of the first lens array 110 in the photopolymer 100 will be described with reference to FIG. 1A.

The first lens array 110 and the photopolymer 100 are disposed at a portion where the reference light and the object light intersect and the object light passing through the first lens array 110 meets the reference light in the photopolymer 100, A laser interferometer can be configured to take place. For example, the first lens array 110 state may be a concave mirror arrangement state.

Here, the object light is incident perpendicularly to the first lens array 110, and the reference light can be incident on the surface of the photopolymer 100 at the first incident angle 115.

Geometrically, the object light passing through the first lens array 110 and traveling toward the focal plane of the first lens array 110 meets the reference light having the first incident angle 115 on the surface of the photopolymer 100 And in this process, the state of the first lens array 110 in the photopolymer 100 can be recorded.

In addition, the holographic optical element 100 in which the state of the first lens array 110 is recorded can diffract light to the focal plane of the first lens array 110 with respect to the light incident at the first incident angle 115 .

Next, referring to FIG. 1B, the process of recording the state of the second lens array 120 on the photopolymer 100 in which the first lens array 110 state is recorded will be described.

The second lens array 120 and the photopolymer 100 are disposed at a portion where the reference light and the object light intersect and the object light passing through the second lens array 120 meets the reference light in the photopolymer 100, A laser interferometer can be configured to take place.

Here, the object light is incident on the surface of the second lens array 120 perpendicularly, and the reference light can be incident on the surface of the photopolymer 100 at the second incident angle 125.

Geometrically, the object light passing through the second lens array 120 and traveling toward the focal plane of the second lens array 120 meets the reference light having the second incident angle 125 on the surface of the photopolymer 100 And in this process, the state of the second lens array 120 in the photopolymer 100 can be recorded.

The holographic optical element 100 in which the state of the second lens array 120 is recorded can also diffract light to the focal plane of the second lens array 120 with respect to light incident at the second incident angle 125 .

When the state of the first lens array 110 and the second lens array 120 is recorded in the holographic optical element 100, the photopolymer 100 fixed for a suitable time based on the recording characteristics of the photopolymer 100, After the state of the first lens array 110 is recorded in the second lens array 120, all of the light is blocked and the second lens array 120 is replaced with the photopolymer 100 fixed at the same position for the remaining time, ) State can be recorded.

When the state of the first lens array 110 and the second lens array 120 is recorded in the holographic optical element 100, the amount of the reference light incident on the photopolymer 100 during recording of the first lens array 110 The first incidence angle 115 differs from the second incidence angle 125 of the reference light incident on the photopolymer 100 during recording of the second lens array 120. The first incidence angle of the first lens array 110 and the second lens array 120 may be fixed vertically. Also, the first lens array 110 and the second lens array 120 may have different focal lengths.

2 is a block diagram of a head-mounted display according to an embodiment of the present invention.

2, the head-mounted display device may include a holographic optical element 100, a waveguide 200, a first display portion 210, a second display portion 220, and an adjustment portion.

At this time, the first image outputted from the first display unit 210 is displayed on the first focal plane determined by the state of the first lens array 110, and the second image outputted from the second display unit 220 is displayed on the first focal plane, And may be displayed on the second focal plane determined by the state of the second lens array 120. [

The first image displayed on the first focal plane and the second image displayed on the second focal plane may be combined to realize a three-dimensional image.

The holographic optical element 100 may record the first lens array 110 state and the second lens array 120 state.

The first display unit 210 can output a first image that is incident on the holographic optical element 100 with a first incident angle 115 and the output first image is displayed on the holographic optical element 100 Can be displayed on the first focal plane determined by the recorded first lens array 110 state.

The second display unit 220 may output a second image that is incident on the holographic optical element 100 with a second incident angle 125 and the output second image may be output to the holographic optical element 100 Can be displayed on the second focal plane determined by the recorded state of the second lens array 120. [

The waveguide 200 may be a combination of the holographic optical element 100, the first display portion 210, and the second display portion 220.

The waveguide 200 includes a first surface 201 to which the holographic optical element 100 is coupled, a second surface 202 that is disposed in parallel with the first surface 201, A third surface 203 coupled between the first surface 201 and the second surface 202 to have an incident angle 115 and a second surface 202 having a second incident angle 125 with respect to the second surface 202, And a fourth surface 204 coupled between the first surface 201 and the second surface 202.

The first display portion 210 may be coupled to the third surface 203 and the second display portion 220 may be coupled to the fourth surface 204.

The adjustment unit (not shown) can adjust the arrangement angles of the first display unit 210 and the second display unit 220. The control unit may be directly coupled to the first display unit 210 and the second display unit 220, or may generate and transmit a predetermined control signal.

Referring to FIG. 2, the first incident angle 115 and the second incident angle 125, which are incident angles of the first and second images incident on the waveguide 200, may be greater than the internal total reflection angle of the waveguide 200.

In addition, the first display unit 210 and the second display unit 220 may output the first and second images simultaneously or sequentially.

3 is a view for explaining a principle of generating a three-dimensional image output from a head mount display according to an embodiment of the present invention.

Referring to FIG. 3, light originating at a point on the three-dimensional space passes through the center of each lens of the lens array, and is collected at a position where the light advances by each lens on the focal plane of the lens array. Using these properties, we can express points that exist at different depths.

Accordingly, the head-mounted display of the present invention can record various lens arrangement characteristics by using the characteristics of a photopolymer that changes its refractive index by reacting with light when receiving light, and increases the depth representation of the output image A three-dimensional image can be displayed.

4 is a view for explaining the operation principle of a head mount display according to an embodiment of the present invention.

2 and 4, the first display unit 210 and the second display unit 220 include a first lens array 110 and a second lens array 120 recorded in the holographic optical element 100, It is possible to output the first and second images produced in accordance with the state. The first and second images output from the first and second display units 210 and 220 are reflected inside the waveguide 200 to be incident on the first surface 201 of the waveguide 200, 100, respectively. The first and second images incident on the holographic optical element 100 are incident on the first and second lens arrays 110 and 120 recorded by the holographic optical element 100 as first and second foci Can be diffracted.

Illustratively, when a first image is incident on the first display unit 210 coupled to the third surface 203, the incident first image may have a first incident angle 115 with respect to the second surface 202 And may be reflected to the holographic optical element 100. [ The first image incident on the holographic optical element 100 may be diffracted to the first focal plane of each lens in the first lens array 110 state recorded in the holographic optical element 100. [ At this time, the first display unit 210 may form a three-dimensional image display region at a position adjacent to the focus region of the first lens array 110 or at a position spaced from the focus region by a certain distance.

When a second image is incident on the second display unit 220 coupled to the fourth surface 204, the incident second image has a second incident angle 125 with respect to the second surface 202, And reflected by the optical element 100. A second image incident on the holographic optical element 100 may be diffracted to a second focal plane of each lens in the second lens array 120 state recorded in the holographic optical element 100. [ At this time, the second display unit 220 may form a three-dimensional image display region at a position adjacent to the focus region of the second lens array 120 or at a position spaced from the focus region by a certain distance.

The image display method of the head-mounted display device according to the embodiment of the present invention described above is as follows.

First, a first image which is incident on the holographic optical element so as to have a first incident angle is output.

Next, a second image which is incident on the holographic optical element so as to have a second incident angle is output.

Here, the holographic optical element may previously record the first lens array state matched with the reference light having the first incident angle and the second lens array state matched with the reference light having the second incident angle.

Hereinafter, a head-mounted display device according to another embodiment of the present invention will be described.

The description of the configuration shown in FIG. 3 that performs the same function will be omitted. However, the head-mounted display device to be described below is only one other example of the present invention, and various modifications are possible based on the constituent elements.

5 is a configuration diagram of a head mount display according to another embodiment of the present invention.

A head-mounted display device according to another embodiment of the present invention may include a holographic optical element 100, a display portion 530, and a control portion (not shown).

At least two lens arrangement states can be recorded in the holographic optical element 100 using the wavelength selectivity, which is one of the photopolymer properties. Here, the holographic optical element 100 may be a photopolymer in which the lens array state is recorded.

The holographic optical element 100 may record the first lens array state matched to the reference light of the first wavelength and the second lens array state matched to the reference light of the second wavelength.

The display unit 530 may output the first image 510 of the first wavelength with respect to the holographic optical element 100 and may output the second image 520 of the second wavelength with respect to the holographic optical element 100. [ Can be output.

The display unit 530 may include a first RGB pixel set that outputs a first image 510 of a first wavelength and a second RGB pixel set that outputs a second image 520 of a second wavelength .

The first RGB pixel set and the second RGB pixel set may each be composed of a plurality of subpixels and may include a first image 510 output through the first RGB pixel set and a second image 510 output through the second RGB pixel set, The images 520 may be combined to implement a three-dimensional image.

For example, when the first image 510 is output from the display unit 530, the display unit 530 displays the first image 510 having the first wavelength with respect to the holographic optical element 100, The first image 510 may be displayed on the first focal plane determined by the first lens array state recorded on the holographic optical element 100. [

For example, when a second image 520 is output from the display unit 530, the display unit 530 displays a second image 520 having a second wavelength with respect to the holographic optical element 100, And the output second image 520 may be displayed on the second focal plane determined by the second lens array state recorded on the holographic optical element 100. [

A control unit (not shown) may control the output of the display unit 530 to synchronize the first image 510 and the second image 520 or to correct an error. The user can view the three-dimensional image implemented by the first image 510 and the second image 520 for a long period of time without rejection or fatigue by synchronizing each image or correcting the error. In addition, the control unit may be included in the head-mounted display device according to the embodiment of the present invention described above.

The image display method of the head-mounted display device according to another embodiment of the present invention described above is as follows.

First, a first image of the first wavelength is output to the holographic optical element.

Next, the second image of the second wavelength is outputted to the holographic optical element.

Here, the holographic optical element may previously record the first lens array state matched to the reference light of the first wavelength and the second lens array state matched to the reference light of the second wavelength.

Accordingly, the first and second images input through the display unit are formed into a virtual image on the three-dimensional space in which the first and second focal planes of the first and second lens arrays are located, Dimensional image can be confirmed. Also, the 3D image to be displayed can be freely manipulated through the process of selectively operating or simultaneously operating the display unit.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: photopolymer, holographic optical element 110: first lens array
115: first incidence angle 120: second lens array
125: second incident angle 200: waveguide
201: first side 202: second side
203: third surface 204: fourth surface
210: first display unit 220: second display unit
510: first image 520: second image
530:

Claims (9)

A head-mounted display device comprising:
A holographic optical element in which a first lens array state matched with reference light having a first incident angle and a second lens array state matched with reference light having a second incident angle are recorded at the same position,
A first display unit for outputting a first image incident on the holographic optical element so as to have the first incident angle;
And a second display unit for outputting a second image incident on the holographic optical element so as to have the second incident angle,
Wherein the focus region of the first lens array is formed at a position closer to the holographic optical element than the focus region of the second lens array. The method according to claim 1,
Wherein the first image output from the first display unit is displayed on a first focal plane determined by the first lens array state,
And a second image output from the second display unit is displayed on a second focal plane determined by the second lens array state. The method according to claim 1,
Further comprising a waveguide coupled to the holographic optical element, the first display portion and the second display portion,
The waveguide may include a first surface to which the holographic optical element is coupled,
A second surface disposed parallel to the first surface,
A third surface coupled between the first surface and the second surface to have the first incident angle with respect to the second surface,
And a fourth surface coupled between the first surface and the second surface to have the second incident angle with respect to the second surface,
Wherein the first display portion is coupled to the third surface and the second display portion is coupled to the fourth surface. The method according to claim 1,
And an adjusting unit for adjusting an arrangement angle of the first display unit and the second display unit. A head-mounted display device comprising:
The first lens array state matched with the reference light of the first wavelength and the second lens array state matched with the reference light of the second wavelength are the same The recorded holographic optical element,
And a display unit that outputs a first image of the first wavelength to the holographic optical element and outputs a second image of the second wavelength to the holographic optical element,
Wherein the focus region of the first lens array is formed at a position closer to the holographic optical element than the focus region of the second lens array. 6. The method of claim 5,
Wherein the display unit includes a first set of RGB pixels for outputting a first image of the first wavelength and a second set of RGB pixels for outputting a second image of the second wavelength. 6. The method of claim 5,
Further comprising a control unit for controlling an output of the display unit to synchronize or correct an error between the first image and the second image. A method of displaying an image on a head mounted display device,
Outputting a first image which is incident on the holographic optical element so as to have a first incident angle; and
And outputting a second image that is incident on the holographic optical element so as to have a second incident angle,
The holographic optical element records in advance a first lens array state matched to the reference light having the first incident angle and a second lens array state matched to the reference light having the second incident angle at the same position of the holographic optical element However,
Wherein the focus region of the first lens array is formed at a position closer to the holographic optical element than the focus region of the second lens array. A method of displaying an image on a head mounted display device,
Outputting a first image of a first wavelength with respect to the holographic optical element; and
And outputting a second image of a second wavelength to the holographic optical element,
Wherein the holographic optical element is arranged in the first lens array state matched with the reference light of the first wavelength and the second lens array state matched with the reference light of the second wavelength to the same position of the holographic optical element In advance,
Wherein the focus region of the first lens array is formed at a position closer to the holographic optical element than the focus region of the second lens array.
KR1020150038068A 2015-03-19 2015-03-19 Head mounted display apparatus using photopolymer and image display method KR101645989B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6124954A (en) * 1998-07-29 2000-09-26 Digilens, Inc. Projection screen based on reconfigurable holographic optics for implementation in head-mounted displays

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6124954A (en) * 1998-07-29 2000-09-26 Digilens, Inc. Projection screen based on reconfigurable holographic optics for implementation in head-mounted displays

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Head Mounted Display for Mixed Reality using Holographic Optical Elements (Takahisa ANDO) *
See-through screen for 3D augmented reality (Byoungho LEE) *

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