WO2012118573A1 - Régulation de la lumière dans les visiocasques - Google Patents

Régulation de la lumière dans les visiocasques Download PDF

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Publication number
WO2012118573A1
WO2012118573A1 PCT/US2012/022492 US2012022492W WO2012118573A1 WO 2012118573 A1 WO2012118573 A1 WO 2012118573A1 US 2012022492 W US2012022492 W US 2012022492W WO 2012118573 A1 WO2012118573 A1 WO 2012118573A1
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WO
WIPO (PCT)
Prior art keywords
light
image
see
control element
scene
Prior art date
Application number
PCT/US2012/022492
Other languages
English (en)
Inventor
John N. Border
Joseph Bietry
John D. Haddick
Robert Michael Lohse
Original Assignee
Osterhout Group, Inc.
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.)
Filing date
Publication date
Priority claimed from US13/037,335 external-priority patent/US20110213664A1/en
Priority claimed from US13/037,324 external-priority patent/US20110214082A1/en
Application filed by Osterhout Group, Inc. filed Critical Osterhout Group, Inc.
Priority to CA2828407A priority Critical patent/CA2828407A1/fr
Priority to DE112012001032.9T priority patent/DE112012001032T5/de
Publication of WO2012118573A1 publication Critical patent/WO2012118573A1/fr

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Classifications

    • 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
    • G02B27/281—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for attenuating light intensity, e.g. comprising rotatable polarising 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
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1066—Beam splitting or combining systems for enhancing image performance, like resolution, pixel numbers, dual magnifications or dynamic range, by tiling, slicing or overlapping fields of view
    • 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
    • G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings

Definitions

  • the present disclosure pertains to see-through head mounted displays and the control of light entering and exiting the head mounted display.
  • See-through head mounted displays allow a user to view a displayed image or a see-through view of the scene in front of the user. See-through head mounted displays can also allow the user to view a combined image comprised of a displayed image and a see-through view of the scene in front of the user in which the displayed image is overlaid on the see-through view.
  • the see-through head mounted display can present the displayed image so that the area of the displayed image is transparent, semitransparent or opaque.
  • the see-through view of the scene is unblocked and an overlaid displayed image can be provided with low contrast.
  • the semitransparent mode the see- through view of the scene is partially blocked and an overlaid displayed image can be provided with higher contrast.
  • the opaque mode the se-through view of the scene is fully blocked and an overlaid displayed image can be provided with high contrast.
  • some head-mounted displays provide a see-through display for an augmented reality view in which real-world scenes are visible to a user but additional image information is overlaid on the real-world scenes.
  • Such an augmented reality view is provided by helmet mounted see-through displays found in military applications and by heads-up displays (HUDs) in the windshields of automobiles. In this case, there can be multiple areas for displaying images over the see-through view.
  • HUDs heads-up displays
  • U.S. Pat. No. 5151722 describes a head mounted display with a folded optical path and a beam splitter with a curved mirror to present an image from a CRT image source to the user's eye.
  • the image source is positioned on the side of the user's head with the optical path multiply folded to present the image light from the image source into the user's eye.
  • the curved mirror is positioned between the user's eye and the scene in front of the user.
  • a see-through version of the head mounted display is also discussed wherein the curved mirror is a partially reflective mirror so the user can see through the curved mirror to view the scene in front of the user.
  • the CRT image source is large and heavy so that it is not well suited for head mounted displays.
  • the multiply folded geometry with the image source located on the side of the user's head makes for a larger beam splitter and a thicker geometry in front of the user's eye so that the overall size of the head mounted display is larger.
  • Image light that passes through the partially reflecting mirror is uncontrolled and as such, a portion of the image light escapes through the front of the see-through head mounted display and is seen externally as eyeglow.
  • U.S. Pat. No. 5699194 discloses a see-through head mounted display with a waveguide wherein the outer surface is a partially reflecting mirror.
  • image light from the image source is reflected multiple times from different areas of the partially reflecting mirror before the image light is presented to the user's eye.
  • a corrective lens is provided so that distortions of the see-through view of the scene are reduced.
  • a liquid crystal shutter is provided to block incoming light from the scene so that the see-through headmounted display can be operated in an opaque mode. Image light that passes through the partially reflecting mirror is uncontrolled and as such, a portion of the image light escapes through the front of the see-through head mounted display and is seen externally as eyeglow.
  • U.S. Pat. No. 6693749 describes a head mounted display with a polarizing beam splitter cube to reduce light losses and improve efficiency.
  • An image source is positioned above the user's eye and the optical path is folded once to present the image light from the image source to the user's eye.
  • a curved fully reflecting mirror is positioned below the user's eye to focus the image light at the user's eye.
  • An unpolarized image source is used so that half of the image light from the image source passes through the polarizing beam splitter while the other half of the light is reflected away from the user's eye and toward the scene in front of the user.
  • a polarizer is positioned in front of the polarizing beam splitter cube to block the half of the light that is reflected away from the user's eye and thereby make the user less observable by others in the neighboring environment.
  • the polarizing beam splitter cube is large and heavy, so that it is not well suited for use in a head mounted display.
  • the curved mirror is also relatively large so that by locating the mirror below the user's eye, the thickness of the see-through head mounted display is necessarily larger.
  • the present disclosure provides a see-through head mounted display that is thin and light in weight with a light control element to selectively block escaping image light and thereby reduce eyeglow.
  • a see-through head mounted display apparatus includes a see-through display assembly including an image source and a partially reflecting mirror.
  • the partially reflecting mirror reflects and transmits respective portions of image light from the image source and scene light from a see-through view of an external environment.
  • a combined image comprised of portions of the reflected image light and the transmitted scene light is provided to a user's eye.
  • a light control element is provided to block escaping light comprised of the transmitted portion of image light and the reflected portion of scene light, while allowing a portion of incoming scene light to be transmitted from the external environment to the see-through display assembly.
  • the light control element transmits a higher percentage of incoming scene light than the percentage of escaping light that is not blocked.
  • a method for viewing an image with reduced eyeglow on a see-through head mounted display having a front and a back includes steps of providing image light to a partially reflecting mirror from an image displayed on an image source and reflecting a first portion of the image light from the partially reflecting mirror while transmitting a second portion of the image light through the partially reflecting mirror.
  • the method also includes steps of transmitting a first portion of scene light from the external environment through a light control element at the front of the see-through head mounted display.
  • Additional steps include transmitting a second portion of the scene light through the partially reflecting mirror while reflecting a third portion of the scene light from the partially reflecting mirror, and combining the first portion of the image light with the second portion of the scene light to provide a combined image to a viewer's eye at the back of the see-through head mounted display comprised of the image displayed on the image source overlaid on a view of the external environment.
  • the method also includes a step of using the light control element to block the transmitted second portion of the image light and the reflected third portion of the scene light to reduce eyeglow.
  • FIG. 1 is an illustration of a see-through head mounted display device
  • FIG. 1A is an illustration of a user with a see-through head mounted display device wherein eyeglow is depicted
  • FIG. 2 is an illustration of a combination image as seen by a user when the see-through display device is operated in a transparent mode
  • FIG. 3 is an illustration of a combination image as seen by a user when the see-through display device is operated in a semi-transparent mode
  • FIG. 4 is a schematic view of a cross-section of a see-through display assembly
  • FIG. 5 is a schematic view of a cross-section of a see-through display assembly
  • FIG. 6 is an illustration of an example of the polarization control used to reduce eyeglow
  • FIG. 7 is a schematic cross-section of a light control element
  • FIG. 8 is a schematic cross-section of a see-through display assembly with a light control element mounted in a glasses frame.
  • FIG. 9 is a flowchart describing a method disclosed herein.
  • FIG. 1 shows an illustration of a see-through head mounted display device 100.
  • the device includes a frame 105 with lenses 110 that have display areas 115 and clear areas 102.
  • the device also has image sources and associated optics (not shown) to present image light from the image source to the display areas 115, wherein the image sources and associated optics can be located at the top, bottom or side of the display areas 115.
  • the frame 105 is supported on the viewer's head with arms 130.
  • the arms 130 also contain electronics 125 including a processor to drive the displays and peripheral electronics 127 including batteries and wireless connection(s) to other information sources such as can be obtained on the internet or from localized servers through Wi-Fi, Bluetooth, cellular or other wireless technologies.
  • a camera 120 can be included to capture images of the surrounding environment.
  • the locations of the various components in the see-through head mounted display device 100 are shown as an example, other locations are possible.
  • the see-through head-mounted display device 100 can further include controllable darkening layers in the display areas 115 wherein the controllable darkening layers can change opacity behind the respective portions of the display area 115 to enable changes in operating mode between transparent, semi-transparent and opaque in the areas where images are displayed.
  • the controllable darkening layers can be segmented so that images can be displayed over different areas of the lenses 110.
  • FIG. 2 shows an example of a combined image as seen by a user using a see- through head mounted display device 100 wherein the see-through head mounted display device 100 is operating in a transparent mode. As can be seen in FIG. 2, the displayed image seen by the user has a low contrast and objects from the see-through view are easily seen in the display area 115.
  • FIG. 3 shows an example of a combined image as seen by a user using a see-through head mounted display device 100 wherein the see-through head mounted display device 100 is operating in a semi- transparent mode.
  • the displayed image seen by the user has a higher contrast and objects from the see-through view are very dim in the display area 115.
  • see-through head mounted display devices 100 can provide image information to one eye of the user or both eyes of the user. See-through head mounted display devices 100 that present image information to both eyes of the user can have one or two image sources. Monoscopic viewing in which the same image information is presented to both eyes is done with see-through head mounted display devices 100 that have one or two image sources. Stereoscopic viewing typically requires a head-mounted display device 100 that has two image sources with different images being presented to the user's eyes wherein the different images have different perspectives of the same scene.
  • image sources to provide images for display are known in the art including, for example, organic light-emitting diode (OLED) displays, quantum dot based light emitting diodes (QLED) displays, liquid crystal displays (LCDs), or liquid crystal on silicon (LCOS) displays.
  • OLED organic light-emitting diode
  • QLED quantum dot based light emitting diodes
  • LCDs liquid crystal displays
  • LCOS liquid crystal on silicon
  • the image sources can be microprojectors or microdisplays with associated optics to present the image light to the display areas 115 so that the user can view the displayed images with his/her eyes.
  • the optics associated with the image sources relay the image light from the image sources to the display areas 115.
  • the optics can comprise refractive lenses, reflective lenses, mirrors, diffractive lenses, holographic lenses or waveguides.
  • the user should be provided with at least a partial view of the scene in front of the see-through head-mounted display device 100 within the user's field of view.
  • the present disclosure concerns see- through head mounted display devices 100 that have optics associated with the image source that include a partially reflective mirror for simultaneously presenting image light and scene light to the user so that the user is provided with a displayed image overlaid on at least a partial see-through view of the scene in front of the user.
  • the partially reflective mirror can be any type of reflecting mirror surface that also allows some portion of the incident light to be transmitted such as for example a partially metalized coated surface or a dielectric multilayer mirror coated surface.
  • This disclosure provides methods and apparatus that reduce eyeglow in see-through head mounted displays such as the see-through head mounted display devices 100 which include a partially reflective mirror in the optics associated with the image source.
  • FIGS. 4 and 5 provide examples of optics associated with image sources for see-through head mounted display devices 100 that include partially reflective mirrors 440 and 540.
  • Light control elements 480 and 580 block image light that passes through the partially reflective mirrors 440 and 540 respectively to reduce escaping light that contributes to eyeglow.
  • the image source includes a projection system (not shown) to provide image light with an optical layout that includes a first horizontal optical axis located in or along the upper portion of the frame 105 in the see-through head mounted display device 100.
  • the optics along this first horizontal axis can include lenses to focus the image light 470 to provide a focused displayed image from the image source to the user's eye 410.
  • a folding mirror 460 then redirects the image light 470 from the first horizontal axis to a non-vertical optical axis 452 that proceeds to a see-through display assembly 400 with a beam splitter layer 420 and a second horizontal optical axis 450.
  • the beam splitter layer 420 can be a partially reflecting mirror or a polarizing beam splitter layer.
  • the beam splitter layer 420 in the see-through display assembly 400 is oriented at an angle to the non- vertical optical axis and the second horizontal optical axis 450 to provide a thinner see-through display assembly 400.
  • the beam splitter layer 420 reflects and redirects at least a portion of the image light 470 along the second horizontal optical axis 450 in a direction away from the user's eye 410. A first portion of the image light 470 that has been reflected by the beam splitter layer 420, is then reflected back toward the user's eye 410 by a partially reflecting mirror 440.
  • the partially reflecting mirror 440 can be spherical or aspheric as appropriate to present a focused image to the user's eye 410.
  • the reflected first portion of the image light 470 then passes back through the beam splitter and is focused at the user's eye 410.
  • Light control element 480 blocks the second portion of the image light 470 thereby reducing escaping light and reducing eyeglow.
  • the light control element 480, the partially reflecting mirror 440, the beam splitter layer 420 and the user's eye 410 are all located along a common optical axis, the second horizontal optical axis 450.
  • a first portion of scene light from the external environment 465 passes through the light control element 480.
  • a second portion of the scene light 465 then passes through the partially reflective mirror 440 and the beam splitter layer 420 to combine with the first portion of the image light 470 to present a combined image to the user's eye 410.
  • the combined image includes the displayed image from the image source overlaid onto at least a partial see-through view of the external environment in front of the user.
  • a third portion of the scene light 465 is reflected by the partially reflecting mirror 440.
  • This third portion of scene light 465 also contributes to eyeglow since it escapes from the see-through display assembly 400.
  • the third portion of scene light 465 contributes a generally reflected light from the environment and as such does not contribute to the observable image 190 that can be seen by external viewers.
  • the eyeglow produced by the third portion of scene light 465 is seen by external viewers as a general brightness in the lenses 110 or as a reflected image of the external scene in front of the user.
  • the image source provides linearly polarized image light 470 and the beam splitter layer 420 is a partially reflective mirror.
  • Linearly polarized image light can be provided by various means including microdisplays with linearly polarized illumination such as LCOS displays or LCD displays, alternately self-luminous displays (such as OLED, QLED and transmissive LCOS) with a linear polarizer can be used to provide linearly polarized image light 470.
  • the light control element 480 is a linear polarizer.
  • the linear polarizer in the light control element 480 is oriented relative to the linearly polarized image light 470 so that the second portion of the linearly polarized image light 470 that passes through the partially reflecting mirror 440 is blocked and eyeglow is reduced.
  • the beam splitter layer 420 is a polarizing beam splitter, or the image source provides polarized image light 470 and the beam splitter layer 420 is a polarizing beam splitter, so that the reflected image light 470 is linearly polarized light, this embodiment and the associated polarization control is shown in FIG. 6.
  • the polarization state of the image light is aligned to the polarizing beam splitter so that the image light 470 is reflected by the polarizing beam splitter.
  • FIG. 6 shows the reflected image light as having S state polarization.
  • a first quarter wave film 430 is provided between the beam splitter layer 420 and the partially reflecting mirror 440.
  • the first quarter wave film 430 converts the linearly polarized image light to circularly polarized image light (shown as S being converted to CR in FIG. 6).
  • the reflected first portion of image light 470 is then also circularly polarized where the circular polarization state is reversed (shown as CL in FIG. 6) so that after passing back through the quarter wave film, the polarization state of the reflected first portion of image light 470 is reversed (to P polarization) compared to the polarization state of the image light 470 provided by the image source (shown as S).
  • the reflected first portion of the image light 470 passes through the polarizing beam splitter without reflection losses.
  • the beam splitter layer 420 is a polarizing beam splitter and the see-through display assembly 400 includes a first quarter wave film 430
  • the light control element 480 is a second quarter wave film 653 and a linear polarizer 654.
  • the second quarter wave film 653 converts the second portion of the circularly polarized image light 470 into linearly polarized image light 470 (shown as CR being converted to S) with a polarization state that is blocked by the linear polarizer 654 in the light control element 480 so that eyeglow is reduced.
  • the light control element 480 includes a linear polarizer 654 and a quarter wave film 653, incoming unpolarized scene light 465 from the external environment in front of the user is converted to linearly polarized light (shown as P polarization state in FIG. 6) while 50% of the light is blocked.
  • the first portion of scene light 465 that passes through the linear polarizer 654 is linearly polarized light which is converted by the quarter wave film to circularly polarized light (shown as P being converted to CL in FIG. 6).
  • the third portion of scene light that is reflected from the partially reflecting mirror 440 has reversed circular polarization (shown as converting from CL to CR in FIG.
  • the linear polarizer 654 then blocks the reflected third portion of the scene light thereby reducing escaping light and reducing eyeglow.
  • the reflected first portion of image light 470 and the transmitted second portion of scene light have the same circular polarization state (shown as CL) so that they combine and are converted by the first quarter wave film 430 into linearly polarized light (shown as P) which passes through the beam splitter when the beam splitter layer 420 is a polarizing beam splitter.
  • the linearly polarized combined light 690 then provides a combined image to the user's eye 410 located at the back of the see-through display assembly 400, where the combined image is comprised of overlaid portions of the displayed image from the image source and the see-through view of the external environment in front of the user.
  • an image source 520 that provides linearly polarized image light 570 is used.
  • the linearly polarized image light 570 enters a waveguide 555 wherein the light is first reflected by total internal reflection from the back surface 530, a first portion of the image light 570 is reflected from a partially reflecting mirror 540 and then transmitted through surface 530 to present an image from the image source 520 to the user's eye 410.
  • the user looks through the waveguide 555 and the partially reflecting mirror 540 to obtain a see-through view of the external scene in front of the user.
  • a corrective element 560 is provided to reduce distortions in the see-through view seen by the user.
  • the combined image presented to the user's eye 410 comprised of the displayed image from the image source 520 overlaid on at least a portion of a see-through view of the external scene, is formed from the image light 570 and the scene light 565.
  • eyeglow comes from a second portion of image light 570 that is transmitted through the partially reflecting mirror 540 where it passes through the corrective element 560 and escapes from the see-through display assembly 500.
  • the linear polarization of the image light 570 is maintained so that the second portion of image light 570 that escapes from the see-through display assembly 500 has the same linear polarization as the image light 570 provided by the image source 520.
  • the light control element 580 for this embodiment comprises a linear polarizer that is oriented along with the image source 520 so that escaping light is blocked.
  • the polarization state of the image light 570 and the orientation of the linear polarizer in the light control element 580 are chosen together to block escaping light.
  • the linear polarizer in the light control element 580 is oriented to block S polarized light. As shown in FIG.
  • the light control element 580, the corrective element 560, the partially reflective mirror 540, the waveguide 555 and the user's eye 410 are all located on a common optical axis 550.
  • FIG. 5 shows image light 570 being reflected once on surface 530 and once on partially reflecting mirror 540, waveguides can be used where multiple reflections of the image light 570 occur on either the surface 530 or the partially reflective mirror 540.
  • the embodiments may include see-through display assemblies 400 and 500 where partially reflective mirrors 440 and 540 respectively are located on common optical axes with the user's eye 410 and light control elements 480 and 580 respectively.
  • This optical layout has been selected to provide the additional benefit of providing a thin see-through display assembly with a large displayed field of view overlaid onto the see-through field of view.
  • the portion of the partially reflective mirror where the image is displayed must be relatively large.
  • an angled beam splitter layer as shown in FIG. 4, it is possible to locate the partially reflective mirror above or below the see-through field of view.
  • the partially refiective mirror is located with an optical axis that is perpendicular to the optical axis associated with the see-through field of view, the lateral dimension of the partially reflective mirror increases the thickness of the see-through display assembly substantially.
  • the embodiments may include partially reflective mirrors that share an optical axis with the see-through field of view so that the large dimension of the partially reflective mirror that is associated with the large displayed field of view is vertical and as such does not contribute to the thickness of the see-through display assembly.
  • the partially reflective mirror since the partially reflective mirror is located on the optical axis of the see-through field of view, the partially reflective mirror must be both partially reflective to provide the displayed image and partially transparent to provide the see- through view.
  • a see-through display assembly was designed similar to that shown in FIG. 4 for a 30 degree field of view displayed image. The partially reflective mirror was then 15 mm high. By positioning the partially reflective mirror in front of the user, the thickness of the see-through display assembly from the front of the partially reflective mirror to the back of the beam splitter layer was reduced to 10 mm.
  • the light control layer includes an electrically controllable darkening layer to reduce the amount of scene light entering the see- through head mounted display.
  • the controllable darkening layer is controlled in response to detected changes in the environment, changes in the user's movements or changes in the type of images being displayed.
  • the controllable darkening layer is segmented to provide differential control in the display areas and the clear areas of the lens to provide a displayed image with higher contrast. Examples of controllable darkening layers include various types of liquid crystal layers, electrowetting layers or electrochromic layers.
  • FIG. 7 shows a cross-sectional view of a light control element 700.
  • Light control element 700 includes a controllable darkening layer 652, a quarter wave film 653, a linear polarizer 654 and a support layer 740.
  • light control element 700 can be a separate replaceable element in the see-through head mounted display device 100.
  • different levels of functionality can be built into the light control element 700 such as different color tints or thicker support layers 740 to provide increased impact resistance, ballistic protection or laser protection.
  • Impact resistance can be provided with a high impact plastic such as polycarbonate and ballistic protection can be provided with a laminated component, as in bullet proof glass.
  • Laser protection can also be provided, for example, with cut filters to block laser wavelengths.
  • the support layer 740 can include photochromic materials which automatically darken when in bright environments to block a portion of the scene light thereby making it easier to view displayed images.
  • controllable darkening layer 652 can be included in some versions of the light control element 700 to block a portion of the scene light to provide improved viewing conditions with higher contrast displayed images in portions of the combined image Simpler versions of light control element 700 may simply omit the controllable darkening layer 652.
  • the quarter wave film 653 should be left out of the light control element 700 when used with certain types of see-through display assemblies 400 such as when the image source provides linearly polarized image light 470 and the beam splitter layer 420 is a partially reflective mirror or when a see-through display assembly 500 is used.
  • FIG. 8 shows an example of a see-through display assembly with a light control element 480 in a glasses frame.
  • the glasses cross-section 800 shows the components of see-through display assembly 400 in a glasses frame 805.
  • the light control element 480 covers the entire see-through view seen by the user.
  • Supporting members 887 and 885 are shown supporting the partially reflecting mirror 440 and the beam splitter layer 420 respectively in the field of view of the user's eye 410.
  • the supporting members 885 and 887 along with the light control element 700 are connected to the glasses frame 805.
  • the other components such as the folding mirror 460 and the first quarter wave film 430 are also connected to the supporting members 887 and 885 so that the combined assembly is structurally sound.
  • FIG. 9 describes a method of using the present disclosure.
  • image light is provided by an image source, such as a microdisplay, to a partially reflecting mirror.
  • the partially reflecting mirror reflects a first portion of the image light while transmitting a second portion of image light.
  • a first portion of scene light is transmitted through a light control element.
  • a second portion of the scene light is transmitted through the partially reflecting mirror while a third portion of the scene light is reflected from the partially reflecting mirror in step 940.
  • step 950 the first portion of image light and the second portion of scene light are combined to provide a combined image to the user's eye wherein the combined image is comprised of the displayed image from the image source overlaid on a see-through view of the external scene in front of the user.
  • step 960 the light control element blocks escaping light from the second portion of the image light and the third portion of the scene light to thereby reduce eyeglow. Wherein the percentage of light in the first portion of scene light that is transmitted through the light control element is larger than the percentage of escaping light from the second portion of image light and the third portion of scene light that is not blocked by the light control element.
  • the partially reflecting mirror included in the apparatus can have a range of reflectivity from 20% to 80%.
  • the lower levels of reflectivity provide for more scene light to be presented to the user's eye so that the see-through view is brighter but, higher levels of image light will escape so that power usage for the image source will be increased to provide a displayed image with a given level of brightness.
  • higher levels of reflectivity provide for less scene light to be presented to the user's eye so that the see-through view is dimmer and lower levels of image light will escape, so that power usage for the image source will be reduced to provide a displayed image with a given level of brightness.
  • Linear polarizers typically block 99.9% or greater of one linear polarization state while allowing 99.9% of the other linear polarization state to pass through.
  • Unpolarized light is comprised of a mixture of the two linear polarization states so that 50%> of the unpolarized light is blocked and 50%> passes through the linear polarizer. Purely absorbing filters or purely reflecting filters cannot block a higher percentage of light than they pass under any circumstances.
  • the polarization states of the various portions of the image light and the scene light are controlled in the see-through display assembly and the light control element such that a high percentage of scene light is allowed to pass into the see- through display assembly while a higher percentage of escaping light is blocked so that a bright see-through view is presented to the user and eyeglow is reduced.
  • the image light or the scene light may take on some elliptical polarization, it is reasonable to expect that the light control element blocks greater than 90% of the escaping light while allowing greater than 30% of the scene light to be transmitted.
  • the polarizing beam splitter in the embodiments discussed herein can be of several different types. While the examples shown in FIGS. 4, 6 and 8 show wiregrid plates or wiregrid films applied to support plates as the polarizing beam splitters, MacNeil prism type polarizing beam splitters can also be used.
  • light absorbing structures are included on one or more of the edges of the frame 105 to absorb light that is reflected or scattered from the user's face.
  • the light absorbing structures can include black areas or textured areas.
  • the light absorbing structures can also be flexible to conform to the user's face.
  • optical axis 652 controllable

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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  • Processing Or Creating Images (AREA)
  • User Interface Of Digital Computer (AREA)

Abstract

L'invention se rapporte à un visiocasque semi-transparent qui réduit l'effet de brillance des yeux. Deux images d'une scène sont combinées et présentées à un utilisateur, l'image combinée comprenant des parties de la lumière de l'image qui sont réfléchies et de la lumière provenant d'une vue en transparence de l'environnement extérieur. Ce visiocasque comporte un élément de régulation de la lumière destiné à bloquer les parties de la lumière de l'image qui s'échappent et les parties de la lumière de la scène qui sont réfléchies, cet élément de régulation de la lumière permettant en même temps la transmission, en provenance de l'environnement extérieur, de la lumière de la scène qui entre. Les images sont produites à l'aide d'un miroir partiellement réfléchissant et d'un élément de régulation de la lumière. Une partie de la lumière de la scène est transmise par l'intermédiaire du miroir partiellement réfléchissant et combinée à une partie de la lumière de l'image qui est réfléchie par ledit miroir partiellement réfléchissant. Un élément de régulation de la lumière sert à bloquer une partie de la lumière de l'image et une partie de la lumière de la scène afin de réduire l'effet de brillance des yeux.
PCT/US2012/022492 2011-02-28 2012-01-25 Régulation de la lumière dans les visiocasques WO2012118573A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA2828407A CA2828407A1 (fr) 2011-02-28 2012-01-25 Regulation de la lumiere dans les visiocasques
DE112012001032.9T DE112012001032T5 (de) 2011-02-28 2012-01-25 Lichtsteuerung in am Kopf zu tragenden Displays

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US13/037,335 US20110213664A1 (en) 2010-02-28 2011-02-28 Local advertising content on an interactive head-mounted eyepiece
US13/037,324 US20110214082A1 (en) 2010-02-28 2011-02-28 Projection triggering through an external marker in an augmented reality eyepiece
US13/037,335 2011-02-28
US13/037,324 2011-02-28

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WO2012118573A1 true WO2012118573A1 (fr) 2012-09-07

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PCT/US2012/022568 WO2012118575A2 (fr) 2011-02-28 2012-01-25 Commande d'alignement dans un casque à réalité augmentée

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WO2012118575A2 (fr) 2012-09-07
CA2828413A1 (fr) 2012-09-07

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