KR101764999B1 - Apparatus and Method for Controlling Location of Augmented Reality Image Using Polarization Modulator - Google Patents

Apparatus and Method for Controlling Location of Augmented Reality Image Using Polarization Modulator Download PDF

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KR101764999B1
KR101764999B1 KR1020160017751A KR20160017751A KR101764999B1 KR 101764999 B1 KR101764999 B1 KR 101764999B1 KR 1020160017751 A KR1020160017751 A KR 1020160017751A KR 20160017751 A KR20160017751 A KR 20160017751A KR 101764999 B1 KR101764999 B1 KR 101764999B1
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image
polarization
degrees
mirror
wave plate
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KR1020160017751A
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Korean (ko)
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최희진
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세종대학교산학협력단
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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
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/142—Adjusting of projection optics
    • 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
    • G02B2027/014—Head-up displays characterised by optical features comprising information/image processing systems

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

An apparatus and method for controlling an image projection distance for an augmented reality display using a polarization modulator are disclosed. An apparatus for controlling an image projection distance using a polarization modulator comprises a polarization controller which is disposed on the front surface of an image display device and modulates the polarized light of an image displayed on the image display device; a polarization mirror for reflecting or transmitting an image according to the polarization of the image adjusted by the polarization controller; and a wave plate for rotating the polarization direction of the image transmitted through the polarization mirror by a predetermined angle. The projection distance of the image can be controlled by electrically adjusting the polarization of the image.

Description

[0001] The present invention relates to an image projection distance control apparatus and method for augmented reality display using a polarization modulation apparatus,

The embodiments described below relate to an apparatus and method for controlling an image projection distance for an augmented reality display using a polarization modulation apparatus, and more particularly, to a system and method for adjusting an image projection distance for an augmented reality display using a polarization modulation apparatus capable of selectively displaying an augmented reality image And more particularly, to an apparatus and method for controlling an image projection distance for augmented reality display.

Augmented reality devices are devices that allow observers to see the images displayed on their surroundings (objects) and devices, allowing them to recognize additional information along with their surroundings.

However, existing augmented reality devices have a fixed image position. Due to the characteristics of the miniaturized device, the position of the image is located close to the observer's eye. Therefore, while object information at a close distance can be displayed well, there is a problem that object information at a distance can not be displayed properly.

In order to solve this problem, the distance between the display device and the optical system must be adjusted within the augmented reality device. However, this increases the size of the augmented reality device due to the mechanical movement, .

Korean Patent Laid-Open No. 10-2009-0053316 relates to such a head-mounted display device, which discloses a device relating to a device for minimizing light loss of a head-mounted display device and reducing fatigue when worn.

Embodiments describe an apparatus and method for adjusting an image projection distance for an augmented reality display using a polarization modulation apparatus, and more specifically, provide a technique for selectively displaying an augmented reality image at a near and far distance without mechanical motion.

Embodiments provide a method and apparatus for adjusting the polarization of light constituting an image emitted from an image display apparatus and transmitting an image having different optical paths to the observer according to the polarization of the image, And a method of adjusting an image projection distance for an augmented reality display using a polarization modulation apparatus for observing the image projection distance.

The image projection distance adjustment apparatus for augmented reality display using a polarization modulation apparatus according to an exemplary embodiment of the present invention includes a polarization controller disposed on a front surface of an image display apparatus and modulating polarized light of an image displayed on the image display apparatus; A polarization mirror for reflecting or transmitting an image according to the polarization of the image adjusted by the polarization controller; And a wave plate that rotates the polarization direction of the image transmitted through the polarizing mirror by a predetermined angle, and the projection distance of the image can be adjusted by electrically controlling the polarization of the image.

Wherein the polarization controller modulates the polarization of the image displayed on the image display device by at least one of 45 degrees and 135 degrees and the polarization mirror reflects the linearly polarized light when the polarization direction of the image is 45 degrees, It is possible to transmit linearly polarized light rays when the polarization direction of the polarized light is 135 degrees, which is perpendicular to the angle of reflection.

The wave plate may be a first 1/4 wave plate and a second 1/4 wave plate that allow the image to pass through by rotating the polarization direction of the image by 45 degrees.

Wherein when the image transmitted through the polarizing mirror passes through at least one of the first 1/4 wavelength plate and the second 1/4 wavelength plate, the polarized light of the image is rotated 90 degrees by reflection, And a mirror disposed on the front surface of the first quarter wave plate and the second quarter wave plate, respectively.

Wherein the polarizing mirror has a different optical path depending on whether the image reflects or transmits the polarizing mirror so that the polarizing mirror displays an image closer to the polarizing mirror than when the image is reflected by the polarizing mirror, It is possible to display an image at a longer distance than when it is reflected.

When displaying an image at a long distance, it may further include a high refractive index medium which increases the length of the light path through the light rays.

Wherein when the image is reflected by the polarizing mirror, when the polarized light of the image displayed on the image display device is modulated at 45 degrees using the polarization controller, the image is reflected by the polarizing mirror and is transmitted to the observer, The polarizing mirror has a shorter optical path than when the image is transmitted, so that the image can be displayed at a close range.

Wherein when the image is transmitted by the polarizing mirror, when the polarized light of the image displayed on the image display device is modulated to 135 degrees using the polarization controller, the image is transmitted through the polarizing mirror, Passing through the first 1/4 wave plate so as to rotate the polarization direction by 45 degrees and passing through the first 1/4 wave plate to rotate the polarization direction of the image reflected by the mirror by 45 degrees, After passing through the first quarter wave plate, the polarizing direction of the image is 45 degrees so that the image is reflected by the polarizing mirror to rotate the polarization direction of the image by 45 degrees. / 4 wave plate. After passing through the second quarter wave plate, the second quarter wave plate is re-passed so as to rotate the polarization direction of the image reflected on the half mirror by 45 degrees, 2 After passing through the 1/4 wave plate, Of the polarization direction is 135 degrees it is possible to display an image to be transmitted to the observer, brought by the polarizing mirror, a long optical path than that which the image reflected distance.

Passing the high refractive index medium that increases the length of the optical path after the image is transmitted by the polarizing mirror before passing the image through the first quarter wave plate, After re-passing the first quarter wave plate, the high refractive index medium may be re-passed.

And a half mirror for passing at least a part of the external light coming from the surrounding environment. The external light passes through the half mirror and is transmitted to the observer through the polarizing mirror, The augmented reality can be realized by simultaneously displaying the information appearing in the augmented reality.

There is provided a method of adjusting an image projection distance for an augmented reality display using a polarization modulation apparatus according to another embodiment, the method comprising: modulating a polarization of an image displayed in an image display apparatus using a polarization controller; Reflecting or transmitting an image using a polarizing mirror according to the polarized light of the modulated image; Displaying the image at a closer distance than when the image is reflected by the polarizing mirror; And displaying the image at a longer distance than when the image is transmitted by the polarizing mirror, wherein the image has different optical paths depending on the case of reflecting or transmitting the polarizing mirror, The projection distance of the image can be controlled by electrically adjusting the polarization of the image.

The modulating the polarization of the image using a polarization controller may include modulating the polarization of the image displayed on the image display device by at least one of 45 and 135 degrees and using the polarization mirror to reflect or transmit the image May transmit linearly polarized light when the polarization direction of the image is 45 degrees and transmit the linearly polarized light when the polarization direction of the image is 135 degrees perpendicular to the angle of reflection.

Wherein the step of displaying an image on the near side comprises the steps of: modulating the polarization of the image displayed on the image display device using the polarization controller to 45 degrees, the image being reflected by the polarization mirror to be transmitted to an observer; It is possible to display an image at a short distance with a shorter optical path than when the image is transmitted.

Wherein the step of displaying the image at the long distance comprises the steps of: when the polarized light of the image displayed on the image display device is modulated by 135 degrees using the polarization controller, the polarized light of the image is transmitted through the polarizing mirror, Passing the first quarter wave plate to rotate through 45 degrees; Passing the first quarter wave plate through the first quarter wave plate so as to rotate the polarization direction of the image reflected by the mirror by 45 degrees; The polarizing direction of the image after being passed through the first quarter wave plate is 45 degrees so that the image is reflected on the polarizing mirror; Passing the second 1/4 wave plate to rotate the polarization direction of the reflected image by 45 degrees; Passing the second 1/4 wave plate through the second quarter wave plate to rotate the polarization direction of the image reflected by the half mirror by 45 degrees; And a polarization direction of the image is 135 ° after passing through the second 1/4 wave plate, and is transmitted to an observer. The polarizing mirror has a longer optical path than a case where the image is reflected, Images can be displayed.

The step of displaying the image at a long distance may include passing a high refractive index medium that increases the length of the optical path after the image is transmitted by the polarizing mirror before passing the image through the first quarter wave plate ; And refracting the high refractive index medium after the image reflected on the mirror passes through the first quarter wave plate.

The external light coming from the surrounding environment passes through the half mirror and is transmitted through the polarizing mirror to be seen by the observer. The augmented reality can be realized by simultaneously displaying the information of the surrounding environment and the information displayed on the image display device.

It is possible to provide an apparatus and method for adjusting an image projection distance for an augmented reality display using a polarization modulation apparatus capable of selectively displaying an augmented reality image at a near distance and at a distance without mechanical movement.

According to embodiments, the polarized light of the light emitted from the image display device is adjusted to transmit an image having different optical paths to the observer according to the polarization of the image, the present invention can provide an image projection distance control apparatus and method for an augmented reality display using a polarization modulation apparatus for observing an image.

1 is a view schematically showing a structure of an image projection distance control apparatus for augmented reality display using a polarization modulation apparatus according to an embodiment.
2 is a view for explaining a principle of displaying an augmented reality image in a short distance according to an embodiment.
3 is a view for explaining a principle of displaying an augmented reality image at a long distance according to an embodiment.
4 is a flowchart illustrating a method of adjusting an image projection distance for an augmented reality display using a polarization modulation apparatus according to an exemplary embodiment.
5 is a flowchart illustrating a method of displaying an augmented reality image at a long distance according to an exemplary embodiment.

Hereinafter, embodiments will be described with reference to the accompanying drawings. However, the embodiments described may be modified in various other forms, and the scope of the present invention is not limited by the embodiments described below. In addition, various embodiments are provided to more fully describe the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for clarity.

The embodiments described below relate to an apparatus and method for controlling an image projection distance for an augmented reality display using a polarization modulation apparatus capable of selectively displaying an augmented reality image at a near and far distance without mechanical movement.

Embodiments can provide a structure for changing the position of an image recognized by an observer by changing a light path through which an augmented reality image is projected using a polarization modulation device and a polarization mirror.

Embodiments provide a method and apparatus for adjusting the polarization of light constituting an image emitted from an image display apparatus and transmitting an image having different optical paths to the observer according to the polarization of the image, ) Can be observed.

1 is a view schematically showing a structure of an image projection distance control apparatus for augmented reality display using a polarization modulation apparatus according to an embodiment.

1, an image projection distance control apparatus for augmented reality display using a polarization modulation apparatus according to an embodiment includes a polarization controller 110, a polarization mirror 120, and wave plates 140 and 160 . The image projection distance adjustment apparatus for augmented reality display using the polarization modulation apparatus may further include a mirror 150, a half mirror 170, and a high refractive index medium 130 according to an embodiment.

The polarization controller 110 may be disposed on the front surface of the image display device 100 to modulate the polarization of the image displayed on the image display device 100.

Here, the polarization controller 110 may modulate the polarization of the image (light ray) displayed on the image display device 100 to at least one of 45 degrees and 135 degrees.

The polarizing mirror 120 can reflect or transmit the image according to the polarization of the image adjusted by the polarization controller 110.

Here, the polarizing mirror 120 reflects linearly polarized light when the polarization direction of the image is 45 degrees, and transmits linearly polarized light when the polarization direction of the image is 135 degrees, which is perpendicular to the angle of reflection.

The wave plates 140 and 160 can rotate the polarization direction of the image transmitted through the polarizing mirror 120 by a predetermined angle.

Here, the wave plates 140 and 160 may be a first 1/4 wave plate 140 and a second 1/4 wave plate 160 that allow the image to pass through by rotating the polarization direction of the image by 45 degrees. That is, the polarizing direction can be rotated by 45 degrees every time the linearly polarized light beams in the directions of 45 degrees and 135 degrees pass through at least one of the first 1/4 wave plate 140 and the second 1/4 wave plate 160 have.

On the other hand, the 1/4 wavelength plate can be delayed by 1/4, for example, by passing the 1/4 wave plate twice or by reciprocating, it is delayed twice by 1/4, .

When the image transmitted through the polarizing mirror 120 passes through at least one of the first quarter wave plate 140 and the second quarter wave plate 160, And a mirror 150 disposed on the front surfaces of the first quarter wave plate 140 and the second quarter wave plate 160 so as to rotate.

On the other hand, when the image is reflected or transmitted by the polarizing mirror 120, the image is reflected by the polarizing mirror 120 so that the polarizing mirror 120 displays an image closer to the polarizing mirror 120 It is possible to display an image at a longer distance than when it is reflected.

When the image is reflected by the polarization mirror 120, when the polarization of the image displayed on the image display device 100 is modulated to 45 degrees using the polarization controller 110, the image is reflected by the polarization mirror 120 And is transmitted to the observer 300. The polarizing mirror 120 has a shorter optical path than the case where the image is transmitted, so that the image can be displayed at a short distance.

Also, when the image is transmitted by the polarizing mirror 120, the image has a different optical path from that when the image is reflected by the polarizing mirror 120, and the longer optical path is longer than that when the image is reflected by the polarizing mirror 120 You can display images at a distance to take.

At this time, when the image is displayed at a long distance, the high refractive index medium 130 may be further included.

The high refractive index medium 130 is a part made of a material having a high refractive index and can serve to increase the length of the optical path.

For example, when light passes through a medium of low density, such as air, light travels fast, and when passing through a medium of high density, it takes a long time to pass, so that it may be recognized that the distance is long.

If an image is to be displayed at a long distance, it is possible to display the image farther than the physical limit, even if the apparatus is not enlarged by recognizing the distant distance by passing the high refractive index medium 130. For example, glass or the like may be used for the high refractive index medium 130.

In an image projection distance control apparatus for an augmented reality display using a polarization modulation apparatus according to an exemplary embodiment, external light 200 coming from a surrounding environment passes through a half mirror 170, passes through a polarization mirror 120, 300) (eyes). At this time, an augmented reality in which the information of the surrounding environment and the information displayed on the image display device 100 can be viewed together can be realized.

Accordingly, the image projection distance control apparatus for the augmented reality display using the polarization modulation apparatus according to an embodiment can adjust the projection distance of the image by electrically controlling the polarization of the image. That is, it is possible to selectively display the augmented reality image at a short distance and at a long distance without mechanical movement.

According to embodiments, an image projection distance control apparatus for augmented reality display using a polarization modulation apparatus according to an embodiment can operate in two modes for forming an optical path according to an optical principle. Hereinafter, the optical path of the image projection distance control apparatus for augmented reality display using the polarization modulation apparatus according to one embodiment will be described in more detail.

2 is a view for explaining a principle of displaying an augmented reality image in a short distance according to an embodiment.

Referring to FIG. 2, the principle of displaying an image at a short distance using the structure illustrated in FIG. 1 will be described in detail with reference to an embodiment.

When the polarized light of the image displayed on the image display device 100 is modulated to 45 degrees using the polarization controller 110, the image is reflected by the polarizing mirror 120 according to the principle of the polarizing mirror 120, .

More specifically, the image may have different optical paths depending on the case of reflecting or transmitting the polarizing mirror 120.

When the polarization of the image displayed on the image display device 100 is modulated to 45 degrees using the polarization controller 110, the image can be reflected by the polarization mirror 120 and transmitted to the observer 300. Here, the polarizing mirror 120 can reflect or transmit the image according to the polarization of the image, and can reflect the linearly polarized light when the polarization direction of the image is 45 degrees. On the other hand, the polarizing mirror 120 can transmit linearly polarized light rays when the polarization direction of the image is 135 degrees, which is perpendicular to the angle at which the polarized light is reflected.

Therefore, since the optical path has a short optical path, the image reflected by the polarizing mirror 120 appears to be located at a short distance.

When the image is reflected by the polarizing mirror 120, the image can be displayed at a short distance because the polarizing mirror 120 has a shorter optical path than when the image is transmitted by the polarizing mirror 120.

3 is a view for explaining a principle of displaying an augmented reality image at a long distance according to an embodiment.

Referring to FIG. 3, the principle of displaying an image at a long distance using the structure shown in FIG. 1 will be described in detail with reference to one embodiment.

When the polarized light of the image displayed on the image display device 100 is modulated to 135 degrees using the polarization controller 110, the image is transmitted through the polarizing mirror 120 by the principle of the polarizing mirror 120, (130) and passes through the first quarter wave plate (140). At this time, the polarization direction of the image becomes 180 degrees (0 degrees) rotated by 45 degrees by the principle of the quarter wave plate.

After that, the image reflected on the mirror 150 passes through the first quarter wave plate 140 again and the polarization direction rotates by 45 degrees on the same principle. Therefore, the image reflected from the mirror 150 is 45 The polarizing direction of the polarized light is obtained.

That is, as the image is reflected by the mirror 150 using the first quarter wave plate 140, the polarized light can be rotated 90 degrees by passing through the first quarter wave plate 140 twice.

The polarized light is incident on the polarizing mirror 120 through the high-refractive-index medium 130. The polarizing mirror 120 reflects the polarized light through the quarter wave plate 150 and the mirror 150, The light beams having a polarization direction of 45 degrees are reflected and are directed to the half mirror 170 after passing through the second 1/4 wave plate 160.

Since the half mirror 170 reflects 50% of the incident light, the image is reflected again and passes through the second 1/4 wave plate 160. In this process, the polarizing direction is rotated 90 degrees, do.

That is, as the image is reflected by the half mirror 170 using the second 1/4 wave plate 160, the polarization can be rotated 90 degrees by passing through the second 1/4 wave plate 160 twice.

Accordingly, since the polarizing direction of the image is the direction through which the polarizing mirror 120 can transmit, the image transmitted through the polarizing mirror 120 is visible to the observer 300. At this time, the optical path through which the image reaches the observer 300 through the plurality of optical elements becomes long, and the image appears to be displayed at a long distance.

In particular, when the high refractive index medium 130 is used, the optical path can be further increased so that the image appears to be displayed at a longer distance. That is, by using the high-refractive-index medium 130, it is possible to further increase the difference of the different optical paths at the near and far distances.

When an image is transmitted by the polarizing mirror 120, the image can be displayed at a long distance with a longer optical path than when the polarizing mirror 120 reflects the image.

Through the above principle, the projection distance of the image can be controlled by electrically adjusting the polarization of the image without mechanical movement. That is, the position of the augmented reality image can be adjusted without mechanical movement through the polarization control of the image.

The image projection distance control apparatus for augmented reality display using a polarization modulation apparatus according to an embodiment of the present invention includes a first quarter wave plate 140 and a second quarter wave plate 160, 150 or the half mirror 170, the polarization can be rotated by 90 degrees. In addition, the image projection distance control apparatus for augmented reality display using the polarization modulation apparatus according to an embodiment can adjust the optical path using the polarization selectivity of the polarization mirror 120. [

4 is a flowchart illustrating a method of adjusting an image projection distance for an augmented reality display using a polarization modulation apparatus according to an exemplary embodiment.

Referring to FIG. 4, in an image projection distance control method for augmented reality display using a polarization modulation apparatus according to an exemplary embodiment, a method of modulating a polarization of an image displayed in an image display apparatus using a polarization controller (410) A step 420 of reflecting or transmitting an image using a polarizing mirror in accordance with the polarized light of the modulated image, a step 430 of displaying an image closer to the polarized light than when the polarized light is reflected by the polarizing mirror, And displaying (440) the image at a longer distance than when it is reflected when the image is transmitted by the mirror. The image has different light paths depending on the case of reflecting or transmitting the polarizing mirror, and the projection distance of the image can be adjusted by electrically controlling the polarization of the image.

Then, the external light coming from the surrounding environment passes through the half mirror and then passes through the polarizing mirror to be seen by the observer, and the augmented reality can be realized by displaying the information of the surrounding environment and the information displayed on the image display device at the same time.

According to the embodiments, the augmented reality image can be selectively displayed at a short distance and at a long distance without mechanical movement.

In addition, according to embodiments, an image having different optical paths according to the polarization of an image is transmitted to the observer by adjusting the polarization of light constituting an image emitted from the image display device, So that the image can be observed.

Hereinafter, an image projection distance control method for augmented reality display using a polarization modulation apparatus according to an embodiment will be described in more detail with reference to one embodiment.

Referring to FIG. 4, the image projection distance control method for augmented reality display using a polarization modulation apparatus according to an embodiment includes an image projection distance for an augmented reality display using a polarization modulation apparatus according to one embodiment shown in Figs. Can be explained in more detail using a regulating device.

As described above, the image projection distance adjustment apparatus for augmented reality display using the polarization modulation apparatus according to an exemplary embodiment may include a polarization controller, a polarization mirror, and a wave plate. According to an embodiment, an image projection distance control apparatus for augmented reality display using a polarization modulation apparatus may further include a mirror, a half mirror, and a high refractive index medium. Hereinafter, an image projection distance adjustment apparatus for augmented reality display using a polarization modulation apparatus will be simply referred to as an image projection distance adjustment apparatus.

In step 410, the image projection distance controller may modulate the polarization of the image displayed on the image display device using a polarization controller.

The image projection distance controller may modulate the polarization of the image displayed on the image display device to at least one of 45 degrees and 135 degrees.

In step 420, the image projection distance controller may reflect or transmit the image using a polarization mirror according to the polarization of the modulated image.

The image projection distance control device reflects the linearly polarized light ray when the polarization direction of the image is 45 degrees and transmits the linearly polarized light ray when the polarization direction of the image is 135 degrees perpendicular to the reflection angle.

In step 430, if the image is reflected by the polarizing mirror, the image projection distance adjustment apparatus can display the image at a closer distance than when it is transmitted.

In the image projection distance control apparatus, when a polarized light of an image displayed on an image display device is modulated at 45 degrees using a polarization controller to display an image at a short distance, the image can be reflected by a polarizing mirror and transmitted to an observer.

In this case, the image can be displayed at a short distance with a shorter optical path than when the image is transmitted by the polarizing mirror.

In step 440, when the image is transmitted by the polarizing mirror, the image projection distance control device can display the image at a distance from the reflected image.

The image projection distance control device allows the image to be transmitted by the polarizing mirror when modulating the polarization of the image displayed on the image display device by 135 degrees using a polarization controller to display an image at a long distance, And a different optical path can be formed.

In this case, the image can be displayed at a long distance with a longer optical path than when the image is reflected by the polarizing mirror.

The method of displaying images at such a long distance will be described in more detail below.

5 is a flowchart illustrating a method of displaying an augmented reality image at a long distance according to an exemplary embodiment.

5, when the polarized light of the image displayed on the image display device is modulated by 135 degrees using the polarization controller, the image is transmitted through the polarizing mirror, and then the polarized light of the first 1/4 wavelength (443) passing the first 1/4 wave plate so as to rotate the polarization direction of the image reflected on the mirror by 45 degrees after passing through the first 1/4 wave plate, After passing through the 1/1 wavelength plate, the polarization direction of the image is 45 degrees so that the image is reflected on the polarizing mirror (Step 445). The polarized light passes through the second 1/4 wavelength plate so as to rotate the polarization direction of the reflected image by 45 degrees (447), passing through the second quarter-wave plate, re-passing (447) the second quarter-wave plate to rotate the polarization direction of the image reflected on the half mirror by 45 degrees, and (Step 448) in which the polarization direction of the image after passing through the 1/4 wave plate is 135 degrees and transmitted to the observer There. The image can be displayed at a long distance with a longer optical path than when the image is reflected by the polarizing mirror.

And displaying the image at a distance comprises passing a high refractive index medium 441 that increases the length of the optical path after the image has been transmitted by the polarizing mirror 441 before passing through the first quarter wave plate 441 ) And refocusing the high-refraction medium (444) after the image reflected on the mirror passes through the first quarter-wave plate again.

When the image is transmitted by the polarizing mirror, the image can be displayed at a long distance with a longer optical path than when the image is reflected by the polarizing mirror.

In particular, when a high-refractive-index medium is used, the optical path can be further increased so that the image appears to be displayed at a longer distance. That is, by using a high-refractive-index medium, it is possible to further increase the difference of the different optical paths at the near and far distances.

If images are to be displayed at a long distance, images can be displayed farther than the physical limit, even if the apparatus is not enlarged by recognizing the distances by passing the high refractive index medium.

Hereinafter, a method of displaying the augmented reality image at a distance will be described in more detail.

The method of displaying the augmented reality image at a long distance can be more specifically explained by using an image projection distance adjustment device (image projection distance adjustment device for augmented reality display using a polarization modulation device) as in Fig.

First, when the polarization of the image displayed on the image display device using the polarization controller is modulated (410) to 135 degrees, the image projection distance controller may transmit the image 420 through the polarizing mirror.

More specifically, in step 410, the image projection distance controller may modulate the polarization of the image by 135 degrees using the polarization controller to display the image on the image display device.

In operation 420, the image projection distance control unit may transmit an image using a polarization mirror. That is, when the polarization direction of the image is 135 ° perpendicular to the angle of reflection, the polarizing mirror can transmit linearly polarized light rays.

In step 441, the image projection distance adjustment device may pass a high refractive index medium that increases the length of the optical path after the image is transmitted by the polarizing mirror.

In step 442, the image projection distance controller may pass the first quarter wave plate to rotate the polarization direction of the image by 45 degrees. At this time, the polarization direction of the image becomes 180 degrees (0 degrees) rotated by 45 degrees from 135 degrees by the principle of the quarter wave plate.

In step 443, the image projection distance adjusting device may pass the first quarter wave plate so that the polarization direction of the image reflected on the mirror is rotated by 45 degrees after passing through the first quarter wave plate.

In step 444, the image projection distance controller may rotate the image reflected by the mirror 90 degrees after passing through the first quarter wave plate to pass the high refractive index medium again.

In step 445, since the polarizing direction of the image is rotated by 45 degrees after the first quarter-wave plate passes through the first quarter-wave plate, the image is finally reflected to the polarizing mirror by 45 degrees . That is, as the image is reflected by the mirror using the first quarter wave plate, the polarization can be rotated by 90 degrees by passing through the first quarter wave plate twice.

In step 446, the image projection distance adjustment device may pass the second quarter wave plate to rotate the polarization direction of the reflected image by 45 degrees.

At step 447, the image projection distance adjustment device may pass the second quarter wave plate back through the second quarter wave plate to rotate the polarization direction of the image reflected on the half mirror by 45 degrees .

Since the half mirror reflects 50% of the incident light, the image is reflected again and passes through the second 1/4 wave plate. In this process, the polarization direction rotates 90 degrees and again 135 degrees.

That is, as the image is reflected by the half mirror using the second 1/4 wavelength plate, the polarization can be rotated by 90 degrees by passing through the second 1/4 wave plate twice.

In step 448, after the image projection distance adjustment device passes through the second 1/4 wave plate, the polarization direction of the image is 135 degrees, which is transmitted to the observer so that the longer optical path is longer than when the image is reflected by the polarization mirror You can display images at a distance to take.

Then, the external light coming from the surrounding environment passes through the half mirror and then passes through the polarizing mirror to be seen by the observer, and the augmented reality can be realized by displaying the information of the surrounding environment and the information displayed on the image display device at the same time.

According to the embodiments of the present invention, it is possible to provide an apparatus and method for controlling an image projection distance for an augmented reality display using a polarization modulation apparatus capable of selectively displaying an augmented reality image at a short distance and at a long distance without mechanical movement.

In addition, according to embodiments, an image having different optical paths according to the polarization of an image is transmitted to the observer by adjusting the polarization of the light constituting the image emitted from the image display device, The present invention can provide an image projection distance control apparatus and method for an augmented reality display using a polarization modulation apparatus for observing an image of an augmented reality display.

The image projection distance adjustment apparatus for augmented reality display using the polarization modulation apparatus according to the embodiments can be implemented as a wearable device such as smart glasses.

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. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

100: image display device 110: polarization controller
120: polarizing mirror 130: high refractive index medium
140: first quarter wave plate 150: mirror
160: second 1/4 wave plate 170: half mirror
200: external light 300: observer

Claims (16)

A polarization controller disposed on a front surface of the image display device and modulating polarized light of an image displayed on the image display device;
A polarization mirror for reflecting or transmitting an image according to the polarization of the image adjusted by the polarization controller; And
A wave plate for rotating the polarization direction of the image transmitted through the polarizing mirror by a predetermined angle;
/ RTI >
Adjusting the projection distance of the image by electrically controlling the polarization of the image,
Further comprising a half mirror for passing at least part of the external light coming from the surrounding environment,
Wherein the external light passes through the half mirror and then is transmitted through the polarizing mirror to be visible to an observer and simultaneously displays information about the environment and information displayed on the image display device to realize an augmented reality (Image projection distance adjustment device for augmented reality display using a device). The method according to claim 1,
Wherein the polarization controller comprises:
Modulates the polarization of the image displayed on the image display device to at least one of 45 degrees and 135 degrees,
Wherein the polarizing mirror comprises:
When the polarization direction of the image is 45 degrees, the linearly polarized light is reflected, and when the polarization direction of the image is 135 degrees perpendicular to the angle of reflection, the linearly polarized light is transmitted
And an image projection distance control device for augmented reality display using the polarization modulation device. The method according to claim 1,
Wherein the wavelength plate comprises:
A first 1/4 wavelength plate and a second 1/4 wavelength plate through which the image is passed by rotating the polarization direction of the image by 45 degrees
And an image projection distance control device for augmented reality display using the polarization modulation device. The method of claim 3,
Wherein when the image transmitted through the polarizing mirror passes through at least one of the first 1/4 wavelength plate and the second 1/4 wavelength plate, the polarized light of the image is rotated 90 degrees by reflection, And a mirror disposed on the front surface of the quarter-wave plate and the second quarter-
Further comprising a polarization modulating device for modulating the image projection distance for the augmented reality display. The method according to claim 1,
Wherein the polarizing mirror has a different optical path depending on whether the image reflects or transmits the polarizing mirror so that the polarizing mirror displays an image closer to the polarizing mirror than when the image is reflected by the polarizing mirror, If the image is transmitted, the image is displayed at a longer distance than when it is reflected
And an image projection distance control device for augmented reality display using the polarization modulation device. 6. The method of claim 5,
When images are displayed at a long distance, a high refractive index medium
Further comprising a polarization modulating device for modulating the image projection distance for the augmented reality display. 6. The method of claim 5,
When the image is reflected by the polarizing mirror,
When the polarized light of the image displayed on the image display device is modulated at 45 degrees using the polarization controller, the image is reflected by the polarizing mirror and transmitted to the observer, and when the polarized light is transmitted by the polarizing mirror, To display the image at a short distance with the optical path
And an image projection distance control device for augmented reality display using the polarization modulation device. 6. The method of claim 5,
And when the image is transmitted by the polarizing mirror,
Wherein the polarized light of the image displayed on the image display device is transmitted through the polarizing mirror when the polarized light of the image is modulated by 135 degrees using the polarization controller, Passing through the plate, passing through the first quarter wave plate, re-passing the first quarter wave plate to rotate the polarization direction of the image reflected by the mirror by 45 degrees,
After passing through the first quarter wave plate, the polarization direction of the image is 45 degrees, and the image is reflected by the polarizing mirror so that the polarization direction of the image is rotated by 45 degrees so as to pass through the second quarter wave plate Passing the second 1/4 wave plate so that the polarization direction of the image reflected on the half mirror is rotated by 45 degrees,
The polarizing direction of the image after passing through the second 1/4 wave plate is 135 degrees and is transmitted to an observer so that the image is displayed at a long distance with a longer optical path than when the image is reflected by the polarizing mirror
And an image projection distance control device for augmented reality display using the polarization modulation device. 9. The method of claim 8,
Passing the high refractive index medium that increases the length of the optical path after the image is transmitted by the polarizing mirror before passing the image through the first quarter wave plate, After re-passing the first quarter wave plate, re-passing the high refractive index medium
And an image projection distance control device for augmented reality display using the polarization modulation device. delete Modulating polarized light of an image displayed on the image display device using a polarization controller;
Reflecting or transmitting an image using a polarizing mirror according to the polarized light of the modulated image;
Displaying the image at a closer distance than when the image is reflected by the polarizing mirror; And
When the image is transmitted by the polarizing mirror, displaying the image at a longer distance than when it is reflected
Lt; / RTI >
Wherein the image has a different optical path depending on the case of reflecting or transmitting the polarizing mirror, and the projection distance of the image is adjusted by electrically controlling the polarization of the image,
The external light coming from the surrounding environment passes through the half mirror and is transmitted through the polarizing mirror to be seen by the observer and simultaneously displays the information of the surrounding environment and the information displayed on the image display device to realize the augmented reality Image projection distance adjustment method for augmented reality display using polarization modulation device. 12. The method of claim 11,
Wherein modulating the polarization of the image using a polarization controller comprises:
Modulates the polarization of the image displayed on the image display device to at least one of 45 degrees and 135 degrees,
Wherein the step of reflecting or transmitting an image using the polarizing mirror comprises:
When the polarization direction of the image is 45 degrees, the linearly polarized light is reflected, and when the polarization direction of the image is 135 degrees perpendicular to the angle of reflection, the linearly polarized light is transmitted
Wherein the image projection distance adjustment method is used for augmented reality display using a polarization modulation device. 12. The method of claim 11,
The method of claim 1,
When the polarized light of the image displayed on the image display device is modulated at 45 degrees using the polarization controller, the image is reflected by the polarizing mirror and transmitted to the observer, and when the polarized light is transmitted by the polarizing mirror, To display the image at a short distance with the optical path
Wherein the image projection distance adjustment method is used for augmented reality display using a polarization modulation device. 12. The method of claim 11,
Wherein the displaying the image at the long distance comprises:
Wherein the polarized light of the image displayed on the image display device is transmitted through the polarizing mirror when the polarized light of the image is modulated by 135 degrees using the polarization controller, Passing the plate through;
Passing the first quarter wave plate through the first quarter wave plate so as to rotate the polarization direction of the image reflected by the mirror by 45 degrees;
The polarizing direction of the image after being passed through the first quarter wave plate is 45 degrees so that the image is reflected on the polarizing mirror;
Passing the second 1/4 wave plate to rotate the polarization direction of the reflected image by 45 degrees;
Passing the second 1/4 wave plate through the second quarter wave plate to rotate the polarization direction of the image reflected by the half mirror by 45 degrees; And
The polarizing direction of the image after passing through the second 1/4 wave plate is 135 degrees and transmitted to an observer
Lt; / RTI >
Wherein the image is displayed at a long distance with a longer optical path than when the image is reflected by the polarizing mirror. 15. The method of claim 14,
Wherein the displaying the image at the long distance comprises:
Passing a high refractive index medium that increases the length of the optical path after the image is transmitted by the polarizing mirror, before passing the image through the first quarter wave plate; And
Refracting the high-refractive-index medium after the image reflected on the mirror passes through the first quarter-wave plate,
Further comprising the step of adjusting the projection distance of the augmented reality image using the polarization modulation device. delete
KR1020160017751A 2016-02-16 2016-02-16 Apparatus and Method for Controlling Location of Augmented Reality Image Using Polarization Modulator KR101764999B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3958037A4 (en) * 2019-03-21 2022-11-02 BOE Technology Group Co., Ltd. Integrated imaging display system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005084374A (en) * 2003-09-09 2005-03-31 Nec Viewtechnology Ltd Projector and three-dimensional image display system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005084374A (en) * 2003-09-09 2005-03-31 Nec Viewtechnology Ltd Projector and three-dimensional image display system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3958037A4 (en) * 2019-03-21 2022-11-02 BOE Technology Group Co., Ltd. Integrated imaging display system

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